WO2016006470A1 - Power transmission device and non-contact power transmission apparatus - Google Patents

Abstract

A power transmission device is provided with an AC power source for outputting AC power having a predetermined frequency, and a primary coil to which the AC power is input. The AC power source is provided with a first power source unit and a second power source unit. Each of the first and second power source units is configured to convert external power into AC power to output the converted AC power, when the external power is input. The rated voltage value of the first power source unit is higher than that of the second power source unit. The rated current value of the second power source unit is higher than that of the first power source unit. Either the first or second power source unit is selected as a power source unit for receiving the external power and outputting the AC power toward the primary coil.

Description

Power transmission device and contactless power transmission device

The present invention relates to a power transmission device and a contactless power transmission device.

A contactless power transmission device that does not use a power cord and a power transmission cable is known. The non-contact power transmission apparatus includes, for example, an AC power supply that outputs AC power of a predetermined frequency, and a power transmission device having a primary side coil to which AC power is input, and an AC without contact from the primary side coil. And a power receiving device having a secondary coil configured to receive power. For example, in the non-contact power transmission device of Patent Document 1, when the primary coil and the secondary coil perform magnetic field resonance, AC power is transmitted from the power transmission device to the power reception device in a non-contact manner.

JP, 2009-106136, A

The output power value of the AC power supply depends on the input impedance of the primary coil. The input impedance of the said primary side coil is fluctuate | varied by conditions, such as a relative position of a primary side coil and a secondary side coil, for example. In order to set the output power value of the AC power supply to a desired value in a configuration in which the input impedance of the primary coil fluctuates, it is preferable that both the rated voltage value and the rated current value of the AC power supply be high. However, if both the rated voltage value and the rated current value are high, the power loss of the AC power supply tends to be large. From the above, when the input impedance of the primary coil fluctuates, there is still room for improvement in the configuration for outputting AC power of a desired power value from the AC power supply.

An object of the present invention is to provide a power transmission device and a contactless power transmission device capable of preferably outputting AC power of a desired power value from an AC power supply.

A power transmission device achieving the above object includes an AC power supply outputting AC power of a predetermined frequency, and a primary coil to which the AC power is input, and the power receiving device having a secondary coil. The AC power is configured to be transmitted contactlessly to the secondary coil. The alternating current power supply comprises a first power supply unit and a second power supply unit. Each of the first power supply unit and the second power supply unit is configured to convert the external power into the AC power and output the external power when the external power is input. The rated voltage value of the first power supply unit is higher than the rated voltage value of the second power supply unit, and the rated current value of the second power supply unit is higher than the rated current value of the first power supply unit. Either the first power supply unit or the second power supply unit is selected as a power supply unit to which the external power is input and which outputs the AC power toward the primary side coil.

A contactless power transfer apparatus for achieving the above object comprises: an AC power supply outputting AC power of a predetermined frequency; a primary coil to which the AC power is input; and the primary coil to be input. And a secondary coil configured to receive alternating current power in a contactless manner. The AC power supply includes a first power supply unit and a second power supply unit, and each of the first power supply unit and the second power supply unit converts the external power into the AC power when external power is input. It is configured to output. The rated voltage value of the first power supply unit is higher than the rated voltage value of the second power supply unit, and the rated current value of the second power supply unit is higher than the rated current value of the first power supply unit. The non-contact power transmission apparatus is a power supply unit which receives the external power and which outputs the alternating current power toward the primary side coil of either the first power supply unit or the second power supply unit. It further comprises a selection unit to select.

The block diagram which shows the electric constitution of a power transmission apparatus and the non-contact electric power transmission apparatus. Circuit diagram of AC power supply. The flowchart which shows the charge control processing performed by the power transmission side controller. The graph which shows the rated voltage value and rated current value of the 1st power supply part and the 2nd power supply part. The flowchart which shows charge control processing of another example. FIG. 8 is a block diagram showing another example of the alternating current power supply. FIG. 8 is a block diagram showing another example of the alternating current power supply.

Hereinafter, an embodiment of a power transmission device (power transmission device) and a noncontact power transmission device (contactless power transmission system) will be described.
As shown in FIG. 1, the noncontact power transmission apparatus 10 is a noncontact power transmitting device 11 (ground side device, primary side device) capable of power transfer and a power receiving device 21 (vehicle side device, secondary side device) Is equipped. The power transmission device 11 is provided on the ground, and the power reception device 21 is mounted on a vehicle.

The power transmission device 11 includes an AC power supply 12 capable of outputting AC power of a predetermined frequency. The AC power supply 12 is, for example, a voltage source, and the detailed configuration thereof will be described later.
The AC power output from the AC power supply 12 is transmitted contactlessly to the power receiving device 21 and input to a load 22 provided in the power receiving device 21. Specifically, contactless power transmission device 10 is provided in power transmission device 11 as performing power transmission between power transmission device 11 and power reception device 21, and AC power is input from AC power supply 12. A power transmitter 13 and a power receiver 23 provided in the power receiving device 21 are provided.

The power transmitter 13 and the power receiver 23 have the same configuration, and both are configured to be capable of magnetic field resonance. In detail, the power transmission device 13 has a resonant circuit which consists of the primary side coil 13a and the primary side capacitor 13b which were mutually connected in parallel. The power receiver 23 has a resonant circuit composed of a secondary coil 23a and a secondary capacitor 23b connected in parallel to each other. The resonant frequencies of both resonant circuits are set identical.

According to this configuration, when AC power is input to the power transmitter 13 (primary side coil 13a) when the relative position of the power transmitter 13 and the power receiver 23 is at a position where magnetic field resonance is possible, the power transmitter 13 and Magnetic field resonance occurs with the power receiver 23 (secondary coil 23a). Thus, the power receiver 23 receives part of the energy from the power transmitter 13. That is, the power receiver 23 receives AC power from the power transmitter 13.

Incidentally, the frequency of the AC power output from the AC power supply 12 is set according to the resonance frequency of the power transmitter 13 and the power receiver 23 so that power transmission can be performed between the power transmitter 13 and the power receiver 23 There is. For example, the frequency of the AC power is set to be the same as the resonant frequency of the power transmitter 13 and the power receiver 23. In addition, it is not restricted to this, The frequency of alternating current power and the resonant frequency of the power transmission device 13 and the call | power receiving device 23 may shift | deviate within the range which can transmit electric power.

The load 22 to which AC power received by the power receiver 23 is input includes, for example, a rectifier (AC / DC conversion unit) that converts AC power to DC power, and a vehicle battery to which the DC power is input. The AC power received by the power receiver 23 is used to charge the vehicle battery. The impedance of the vehicle battery fluctuates according to the input power value.

As shown in FIG. 1, the power transmission device 11 includes a power transmission side controller 14 that performs various controls of the AC power supply 12. Further, the power receiving device 21 includes a power receiving side controller 24 capable of wireless communication with the power transmission side controller 14. The non-contact power transmission device 10 performs non-contact power transmission through exchange of information performed between the controllers 14 and 24.

Here, assuming that the impedance from the output end of the AC power supply 12 to the load 22 is the power supply load impedance Z, the output power value of the AC power supply 12 depends on the power supply load impedance Z. The power supply load impedance Z fluctuates according to the relative position of the power transmitter 13 (primary side coil 13a) and the power receiver 23 (secondary side coil 23a). The power supply load impedance Z can also be said to be the input impedance of the power transmitter 13 or the primary coil 13a.

As described above, in the configuration in which the power supply load impedance Z fluctuates, the AC power supply 12 may not be able to output AC power of a desired power value depending on the power supply load impedance Z. For example, in a situation where the power supply load impedance Z is excessively high due to the positional deviation between the power transmitter 13 and the power receiver 23, the output voltage value of the AC power supply 12 is obtained before the output power value of the AC power supply 12 becomes a desired power value. May reach the rated voltage value of the AC power supply 12 and the output power value can not be further increased. On the other hand, in a situation where the power supply load impedance Z is excessively low due to the positional deviation between the power transmitter 13 and the power receiver 23, the output current value of the AC power supply 12 before the output power value of the AC power supply 12 becomes the desired power value. May reach the rated current value of the AC power supply 12 and the output power value can not be further increased.

On the other hand, the AC power supply 12 of the present embodiment is configured to be able to cope with the fluctuation of the power supply load impedance Z. Hereinafter, the detailed configuration of the AC power supply 12 will be described.
As shown in FIG. 1, the AC power supply 12 converts the system power into AC power when the system power as external power is input from the system power supply E as an infrastructure, and outputs the AC power. The first power supply unit 31 and the second power supply unit 32 are provided. The first power supply unit 31 receives the first AC / DC converter 41 for converting the system power into DC power of a predetermined voltage value, and the DC power converted by the first AC / DC converter 41. And a first DC / AC converter 51 for converting the DC power into AC power. Further, the second power supply unit 32 is a unit to which the second AC / DC converter 42 for converting the system power into the DC power of a predetermined voltage value and the DC power converted by the second AC / DC converter 42 are input. And a second DC / AC converter 52 for converting the DC power into AC power.

The AC power supply 12 outputs AC power toward the power transmitter 13 (primary coil 13 a) using either the first power supply unit 31 or the second power supply unit 32. Specifically, the AC power supply 12 is a first switching relay 61 that switches the input destination of the grid power to the first AC / DC converter 41 or the second AC / DC converter 42, and the input source of AC power to the power transmitter 13 , And a second switching relay 62 for switching to the first DC / AC converter 51 or the second DC / AC converter 52. The first switching relay 61 switches the connection destination of the system power source E to the first AC / DC converter 41 or the second AC / DC converter 42, and the second switching relay 62 selects the connection destination of the power transmitter 13. Switching to the first DC / AC converter 51 or the second DC / AC converter 52 is performed.

According to this configuration, when the first power supply unit 31 is connected to the system power supply E and the power transmitter 13 by the switching relays 61 and 62, the system power supply E and the first AC / DC converter 41 are connected in detail. In addition, when the first DC / AC converter 51 and the power transmitter 13 are connected, system power is converted into AC power by the first power supply unit 31, and the AC power is output to the power transmitter 13. On the other hand, when the second power supply unit 32 is connected to the system power supply E and the power transmitter 13 by the switching relays 61 and 62, the system power supply E and the second AC / DC converter 42 are connected in detail. When the second DC / AC converter 52 and the power transmitter 13 are connected, the system power is converted into AC power by the second power supply unit 32, and the AC power is output to the power transmitter 13.

The first AC / DC converter 41 corresponds to the “first external power converter”, and the second AC / DC converter 42 corresponds to the “second external power converter”. The first DC / AC converter 51 corresponds to the “first DC / AC converter”, and the second DC / AC converter 52 corresponds to the “second DC / AC converter”. The first switching relay 61 corresponds to the "first switching unit", and the second switching relay 62 corresponds to the "second switching unit".

The detailed configuration of each power supply unit 31, 32 will be described.
As shown in FIG. 2, the first AC / DC converter 41 of the first power supply unit 31 is a step-up type, and is rectified by, for example, a high voltage rectification circuit 41 a for rectifying system power and a high voltage rectification circuit 41 a The high voltage chopper circuit 41b is provided to perform voltage value conversion of direct current power.

The high voltage chopper circuit 41b includes, for example, a high voltage coil L1, a high voltage diode D1, a high voltage capacitor C1, and a first high voltage switching element Qv1. One end of the high voltage coil L1 is connected to the first input end of the AC power supply 12 via the high voltage rectification circuit 41a and the first switching relay 61, and the other end of the high voltage coil L1 is high voltage It is connected to the anode of the diode D1. The cathode of the high voltage diode D1 is connected to the first output end (+ end) of the first AC / DC converter 41. The first high voltage switching element Qv1 is formed of, for example, an n-type power MOSFET, and the drain thereof is connected to a connection line between the high voltage coil L1 and the high voltage diode D1. The source of the first high voltage switching element Qv1 is connected to the second input end of the AC power supply 12 via the high voltage rectification circuit 41a, and the second output end (-end of the first AC / DC converter 41). )It is connected to the. The high voltage capacitor C1 is provided downstream of the high voltage diode D1 and is connected in parallel to the high voltage diode D1.

According to this configuration, when the first high voltage switching element Qv1 is periodically turned ON / OFF (switching, chopping) in the situation where the system power is input to the first AC / DC converter 41, the high voltage rectification is performed. The DC power rectified by the circuit 41a is converted into DC power of a predetermined voltage value and output.

The first DC / AC converter 51 of the first power supply unit 31 is, for example, a class D amplifier. Specifically, the first DC / AC converter 51 includes a second high voltage switching element Qv2 and a third high voltage switching element Qv3 connected in series with each other. The high voltage switching elements Qv2 and Qv3 are, for example, n-type power MOSFETs. The drain of the second high voltage switching element Qv2 is connected to the first output end of the first AC / DC converter 41, and the source of the third high voltage switching element Qv3 is connected to the first AC / DC converter 41. It is connected to the second output end. The source of the second high voltage switching element Qv2 and the drain of the third high voltage switching element Qv3 are connected, and the connection line thereof is the first input end of the power transmitter 13 via the second switching relay 62 ( It is connected to one end of the primary coil 13a. The source of the third high voltage switching element Qv3 is connected to the second input terminal of the power transmitter 13 (the other end of the primary coil 13a).

According to this configuration, the high voltage switching elements Qv2 and Qv3 are alternately turned ON / OFF in a situation where DC power from the first AC / DC converter 41 is input to the first DC / AC converter 51. As a result, AC power corresponding to the switching frequency of each of the high voltage switching elements Qv2 and Qv3 is output from the first DC / AC converter 51.

Similarly, as shown in FIG. 2, the second AC / DC converter 42 of the second power supply unit 32 includes, for example, a high current rectification circuit 42 a and a high current chopper circuit 42 b. The high current chopper circuit 42b includes, for example, a high current coil L2, a high current diode D2, a high current capacitor C2, and a first high current switching element Qi1. The second DC / AC converter 52 also includes a second high current switching element Qi2 and a third high current switching element Qi3. The specific connection mode and operation mode of each of these elements are the same as those of the first AC / DC converter 41 and the first DC / AC converter 51, and thus detailed description will be omitted. The high voltage switching elements Qv1 to Qv3 correspond to "first switching elements", and the high current switching elements Qi1 to Qi3 correspond to "second switching elements".

Assuming that the rated voltage value and rated current value of the first power supply unit 31 are the first rated voltage value V1 and the first rated current value I1, the rated voltage value and the rated current value of the second power supply unit 32 are the second rated voltage value V2 and The second rated current value I2 is used. In this case, the first rated voltage value V1 is set to be higher than the second rated voltage value V2, and the second rated current value I2 is set to be higher than the first rated current value I1. In detail, in each of the elements constituting the first power supply unit 31 and the elements constituting the second power supply unit 32, the first rated voltage value V1 is higher than the second rated voltage value V2, and the second rated current value I2 is Is set to be higher than the first rated current value I1. For example, the rated voltage value of each high voltage switching element Qv1 to Qv3 is higher than the rated voltage value of each high current switching element Qi1 to Qi3, and the rated current value of each high current switching element Qi1 to Qi3 is It is set higher than the rated current value of the high voltage switching elements Qv1 to Qv3. Also, the rated voltage value of the high voltage diode D1 is higher than the rated voltage value of the high current diode D2, and the rated current value of the high current diode D2 is set higher than the rated current value of the high voltage diode D1. It is done.

That is, the rated voltage value of the first AC / DC converter 41 is higher than the rated voltage value of the second AC / DC converter 42, and the rated current value of the second AC / DC converter 42 is the first AC / DC converter 41. It is set higher than the rated current value of. The rated voltage value of the first DC / AC converter 51 is higher than the rated voltage value of the second DC / AC converter 52, and the rated current value of the second DC / AC converter 52 is the first DC / AC converter 51. It is set higher than the rated current value of. The same applies to the high voltage coil L1 and the high current coil L2, and the high voltage capacitor C1 and the high current capacitor C2.

Although not shown, the high voltage rectification circuit 41a has a high voltage diode D1, and the high current rectification circuit 42a has a high current diode D2.
Next, the first rated voltage value V1 and the second rated current value I2 will be described.

In the non-contact power transmission device 10 of the present embodiment, a positional deviation allowable range for permitting positional deviation between the power transmitter 13 (primary side coil 13a) and the power receiver 23 (secondary side coil 23a) is predetermined. There is.

Although the positional deviation allowable range is arbitrary, for example, a range in which the transmission efficiency between the power transmitter 13 and the power receiver 23 is equal to or higher than a predetermined threshold efficiency, or a range within a specific distance predetermined from the power transmitter 13 It may be set. In addition, when the vehicle equipped with the power receiving device 21 is equipped with an assist function for arranging the vehicle at a desired position by assisting the operation such as the steering wheel operation at the time of parking or garage entry, An error range of alignment by the assist function may be set as a positional deviation allowable range.

In such a configuration, the first rated voltage value V1 and the second rated current value I2 are predetermined from the AC power supply 12 regardless of how the position of the power receiver 23 fluctuates within the positional deviation allowable range. The charging power (second AC power), which is AC power of the specific power value (desired power value), is set to be able to be output.

Specifically, in a configuration in which the position of the power receiver 23 fluctuates within the positional deviation allowable range, the minimum value of the power supply load impedance Z is set as the minimum power supply load impedance Zmin, and the maximum value of the power supply load impedance Z is the maximum power supply load impedance It is assumed that Zmax. In such a configuration, the first rated voltage value V1 corresponds to the maximum power supply load impedance Zmax so that the AC power supply 12 can output the charging power when the power supply load impedance Z is the maximum power supply load impedance Zmax. It is set. Similarly, second rated current value I2 is set corresponding to minimum power supply load impedance Zmin so that AC power supply 12 can output charging power when power supply load impedance Z is minimum power supply load impedance Zmin. ing.

Here, the power loss of each of the power supply units 31 and 32 is smaller than the power loss of a single power supply unit having the first rated voltage value V1 and the second rated current value I2. In detail, the power loss of the power supply units 31 and 32 is defined by the ON resistances of the switching elements Qv1 to Qv3 and Qi1 to Qi3. The ON resistances of the high voltage switching elements Qv1 to Qv3 and the ON resistances of the high current switching elements Qi1 to Qi3 are both single power supplies having the first rated voltage value V1 and the second rated current value I2. Lower than the ON resistance of the switching element used in the

Incidentally, the ON resistances of the high current switching elements Qi1 to Qi3 are lower than the ON resistances of the high voltage switching elements Qv1 to Qv3. Therefore, the power loss of the second power supply unit 32 is lower than the power loss of the first power supply unit 31.

As shown in FIG. 2, the power transmission device 11 includes an impedance measuring device 70 that measures the power supply load impedance Z. The impedance measuring device 70 measures values such as the output voltage value and the output current value of the AC power supply 12, and measures or calculates the power supply load impedance Z from the measurement results. Also, the impedance measuring device 70 transmits the measurement result to the power transmission side controller 14. Thus, the power transmission controller 14 can grasp the power supply load impedance Z.

When the predetermined start condition is satisfied, the power transmission side controller 14 executes a charge control process for charging the vehicle battery. In the charge control process, the power transmission controller 14 controls switching of the switching relays 61 and 62 according to the power supply load impedance Z measured by the impedance measuring device 70, and controls the switching elements Qv1 to Qv3 and Qi1 to Qi3. Perform ON / OFF control. Note that the start condition that triggers the execution of the charge control process is arbitrary.

The charge control process will be described with reference to the flowchart of FIG. For convenience of explanation, in the following description, it is assumed that the vehicle is stopped at a position where the power receiver 23 is disposed within the positional deviation allowable range.

As shown in FIG. 3, the power transmission controller 14 first selects the second power supply unit 32 as a power supply unit that receives grid power and outputs AC power toward the power transmitter 13 in step S101. The test power (first alternating current power) is output using the selected second power supply unit 32. In detail, the power transmission controller 14 controls the switching relays 61 and 62 such that the second power supply unit 32 is connected to the system power supply E and the power transmitter 13. Then, the power transmission controller 14 periodically turns on / off the high current switching elements Qi1 to Qi3 so that the test power is output from the AC power supply 12.

Here, the voltage value of DC power output from the AC / DC converters 41 and 42 depends on the ON / OFF duty ratio of the switching elements Qv1 and Qi1 of the AC / DC converters 41 and 42. And the output electric power value of AC power supply 12 (power supply part 31, 32) is prescribed | regulated by the said voltage value. Therefore, in step S101, the power transmission controller 14 periodically turns ON / OFF the first high current switching element Qi1 at a duty ratio corresponding to the power value of the test power. The power transmission controller 14 turns on / off the high current switching elements Qi2 and Qi3 at a frequency corresponding to the resonance frequency of the power transmitter 13.

Incidentally, the power transmission controller 14 turns off all the high voltage switching elements Qv1 to Qv3 when the test power is output from the AC power supply 12 using the second power supply unit 32.

Thereafter, the power transmission side controller 14 grasps the power supply load impedance Z based on the measurement result of the impedance measuring device 70 in step S102. Then, in the subsequent step S103, the power transmission side controller 14 determines whether the grasped power supply load impedance Z is higher than a predetermined threshold impedance Zth. The threshold impedance Zth is a value between the maximum power supply load impedance Zmax and the minimum power supply load impedance Zmin.

Incidentally, the first rated current value I1 and the second rated voltage value V2 are set to values capable of outputting the charging power under the condition that the power supply load impedance Z is the threshold impedance Zth. That is, the AC power supply 12 can output charging power using the first power supply unit 31 within the range of the power supply load impedance Z from the threshold impedance Zth to the maximum power supply load impedance Zmax. The AC power supply 12 can output the charging power using the second power supply unit 32 within the range of the power supply load impedance Z from the minimum power supply load impedance Zmin to the threshold impedance Zth. When the power supply load impedance Z is the threshold impedance Zth, the AC power supply 12 can output charging power regardless of whether the first power supply unit 31 or the second power supply unit 32 is used.

When the power supply load impedance Z is higher than the threshold impedance Zth, the power transmission side controller 14 proceeds to step S104, receives grid power, and outputs the AC power toward the power transmitter 13 as the first power supply unit. The power supply unit 31 is selected, and the process proceeds to step S106. On the other hand, when the power supply load impedance Z is equal to or lower than the threshold impedance Zth, the power transmission side controller 14 proceeds to step S105, receives grid power, and outputs AC power toward the power transmitter 13. The second power supply unit 32 is selected as the power supply unit, and the process proceeds to step S106. The power transmission side controller 14 programmed to execute the processes of step S102 to step S105 functions as a selection unit. That is, the power transmission controller 14 corresponds to the selection unit.

Then, in step S106, the power transmission controller 14 starts outputting the charging power using the power supply unit selected in step S104 or step S105. In detail, for example, when the first power supply unit 31 is selected, the power transmission controller 14 periodically turns on / off the high voltage switching elements Qv1 to Qv3 to select all the high current switching elements Qi1 to Turn Qi3 off. In this case, the power transmission controller 14 periodically turns ON / OFF the first high-voltage switching element Qv1 at a duty ratio corresponding to the power supply load impedance Z and the power value of the charging power, for each high voltage. The switching elements Qv2 and Qv3 are periodically turned ON / OFF at a frequency corresponding to the resonance frequency of the power transmitter 13. Thus, the charging power is output from the AC power supply 12, and the charging power is input to the power transmitter 13. Then, the charging power is transmitted contactlessly from the power transmitter 13 to the power receiver 23, and charging of the vehicle battery is performed. The same applies to the case where the second power supply unit 32 is selected.

The power transmission controller 14 periodically grasps the power supply load impedance Z while outputting the charging power, and changes the power supply unit used for outputting the charging power in accordance with the grasped result.
First, in step S107, the power transmission controller 14 grasps the current power supply load impedance Z.

After that, in step S108, the power transmission controller 14 needs to change the power supply unit based on the power supply load impedance Z grasped in step S107 and the currently selected power supply unit (power supply unit in use). It is determined whether or not.

Specifically, when the power supply unit in use is the first power supply unit 31 and the power supply load impedance Z is equal to or less than the threshold impedance Zth (hereinafter simply referred to as a first change condition), the power transmission controller 14 It is determined that the power supply unit needs to be changed (step S108: YES). Further, when the power supply unit in use is the second power supply unit 32 and the power supply load impedance Z is higher than the threshold impedance Zth (hereinafter referred to as a second change condition), the power transmission controller 14 Determine that it is necessary to change.

On the other hand, when the power supply unit in use is the first power supply unit 31 and the power supply load impedance Z is higher than the threshold impedance Zth, the power transmission side controller 14 or the power supply unit in use is the second power supply unit. If it is 32 and the power supply load impedance Z is equal to or less than the threshold impedance Zth, it is determined that the power supply unit does not need to be changed (step S108: NO).

When the power transmission controller 14 makes an affirmative determination in step S108, the power transmission controller 14 executes a process for changing the power supply unit to be used.
First, in step S109, the power transmission controller 14 interrupts the output of the charging power. In detail, the power transmission side controller 14 turns off all the switching elements Qv1 to Qv3 and Qi1 to Qi3.

Thereafter, in step S110, the power transmission controller 14 changes the power supply unit and resumes the output of the charging power. In detail, when the first change condition is satisfied, the power transmission controller 14 sets the switching relays 61 and 62 such that the connection destination of the system power source E and the power transmitter 13 becomes the second power source unit 32. Control. Then, the power transmission controller 14 periodically turns on / off the high current switching elements Qi1 to Qi3 so that the charging power is output from the second power supply unit 32, and all the high voltage switching elements Qv1 to Turn Qv3 off. Similarly, when the second change condition is satisfied, the power transmission controller 14 controls the switching relays 61 and 62 such that the connection destination of the system power source E and the power transmitter 13 is the first power source unit 31. Do. Then, the power transmission controller 14 periodically turns on / off the high voltage switching elements Qv1 to Qv3 so that the charging power is output from the first power supply unit 31, and all the high current switching elements Qi1 to Turn Qi3 off.

If the power transmission controller 14 makes a negative determination in step S108 or after executing the processing of step S110, it determines in step S111 whether or not a predetermined charging end condition is satisfied. The charge end condition is optional, but for example, when the state of charge of the vehicle battery is a full charge state determined in advance, or when the power transmission device 11 is provided with a stop switch, the stop switch is operated It is possible that it is done.

When the charge end condition is satisfied, the power transmission controller 14 executes an output stop process for stopping the output of the charging power in step S112, and ends the charge control process. On the other hand, when the charge termination condition is not satisfied, the power transmission controller 14 returns to step S107.

Next, the operation of the present embodiment will be described with reference to FIG. FIG. 4 is a graph showing the relationship between each rated voltage value V1, V2 and each rated current value I1, I2. In FIG. 4, voltage values and current values which are power values of charging power are indicated by solid lines, rated values of first power supply unit 31 are indicated by broken lines, and rated values of second power supply unit 32 are indicated by alternate long and short dashed lines. Indicated by. Further, the minimum power supply load impedance Zmin, the threshold impedance Zth and the maximum power supply load impedance Zmax are indicated by a two-dot chain line.

As shown in FIG. 4, when the power supply load impedance Z is higher than the threshold impedance Zth, the first power supply unit 31 having the first rated voltage value V1 higher than the second rated voltage value V2 is selected. On the other hand, when the power supply load impedance Z is equal to or less than the threshold impedance Zth, the second power supply unit 32 having the second rated current value I2 higher than the first rated current value I1 is selected. Therefore, the charging power can be output from the AC power supply 12 within the range of the power supply load impedance Z from the minimum power supply load impedance Zmin to the maximum power supply load impedance Zmax.

According to the embodiment described above, the following effects can be obtained.
(1) The power transmission device 11 includes an AC power supply 12 that outputs AC power, and a power transmitter 13 to which AC power is input from the AC power supply 12. The alternating current power supply 12 includes a first power supply unit 31 and a second power supply unit 32 as a power supply unit that converts the system power into AC power and outputs the AC power when the system power is input. The first rated voltage value V1, which is the rated voltage value of the first power supply unit 31, is set higher than the second rated voltage value V2, which is the rated voltage value of the second power supply unit 32, and the rated current of the second power supply unit 32. The second rated current value I2 which is a value is set to be higher than the first rated current value I1 which is a rated current value of the first power supply unit 31. Then, the power transmission device 11 selects either the first power supply unit 31 or the second power supply unit 32 as a power supply unit that receives grid power and outputs alternating current power toward the power transmitter 13 There are fourteen. In other words, the AC power supply 12 outputs AC power using either the first power supply unit 31 or the second power supply unit 32.

Generally, the power loss of the power supply unit tends to increase as the rated voltage value and the rated current value increase. Therefore, if it is attempted to output AC power using a single power supply unit having both relatively high first rated voltage value V1 and second rated current value I2, the power loss of the single power supply unit is It is easy to grow.

On the other hand, in the present embodiment, the first power supply unit 31 having the first rated voltage value V1 and the second power supply unit 32 having the second rated current value I2 are separately provided. The power loss of each of the first power supply unit 31 and the second power supply unit 32 tends to be smaller than the power loss of the single power supply unit. As a result, power loss can be reduced while maintaining the same output characteristics as compared with the configuration in which AC power is output using the single power supply unit. Thus, the efficiency of the AC power supply 12 can be improved.

(2) The first power supply unit 31 has the high voltage switching elements Qv1 to Qv3. The respective high voltage switching elements Qv1 to Qv3 are periodically turned ON / OFF, whereby the first power supply unit 31 converts grid power into AC power and outputs it. The second power supply unit 32 has high current switching elements Qi1 to Qi3. The second power supply unit 32 converts the system power into AC power and outputs the AC power by periodically turning on / off the respective high current switching elements Qi1 to Qi3. The rated voltage values of the high voltage switching elements Qv1 to Qv3 are set higher than the rated voltage values of the high current switching elements Qi1 to Qi3. The rated current values of the high current switching elements Qi1 to Qi3 are set higher than the rated current values of the high voltage switching elements Qv1 to Qv3.

Then, when the first power supply unit 31 is selected as a power supply unit to which grid power is input and the AC power is output to the power transmission device 13, the power transmission side controller 14 selects each high voltage switching element Qv1. Turn on / off Qv3 periodically. On the other hand, when the second power supply unit 32 is selected as a power supply unit that receives grid power and outputs AC power toward the power transmission device 14, the power transmission controller 14 selects each high current switching element Qi1. Turn on / off Qi3 periodically.

According to this configuration, the system power is converted to AC power and output by periodically turning ON / OFF the switching element corresponding to the selected power supply unit.
Here, when AC power is output by a single power supply unit having both the first rated voltage value V1 and the second rated current value I2, the rated voltage value of the switching element used in the single power supply unit and The rated current value needs to be set corresponding to the first rated voltage value V1 and the second rated current value I2. Then, the ON resistance of the switching element tends to be high.

On the other hand, in the present embodiment, the high voltage switching elements Qv1 to Qv3 corresponding to the first rated voltage value V1 and the high current switching elements Qi1 to Qi3 corresponding to the second rated current value I2 are provided. It is provided separately. The ON resistances of the switching elements Qv1 to Qv3 and Qi1 to Qi3 tend to be lower than the ON resistances of switching elements corresponding to both the first rated voltage value V1 and the second rated current value I2. Thereby, the efficiency improvement of alternating current power supply 12 can be aimed at.

(3) The power supply units 31, 32 convert AC power from the DC power converted by the AC / DC converters 41, 42, and AC / DC converters 41, 42 that convert grid power into DC power of a predetermined voltage value. And DC / AC converters 51, 52 for converting into The rated voltage value of the first AC / DC converter 41 is higher than the rated voltage value of the second AC / DC converter 42, and the rated voltage value of the first DC / AC converter 51 is the second DC / AC converter 52. Higher than the rated voltage value of The rated current value of the second AC / DC converter 42 is higher than the rated current value of the first AC / DC converter 41, and the rated current value of the second DC / AC converter 52 is the rating of the first DC / AC converter 51. Higher than the current value. Thereby, since both the AC / DC converter and the DC / AC converter are separately provided, further reduction of the power loss can be achieved as compared with the configuration in which only one of them is separately provided. Can be Thus, the efficiency of the AC power supply 12 can be further improved.

(4) The power transmission device 11 uses the first switching relay 61 to switch the input destination of the grid power to the first AC / DC converter 41 or the second AC / DC converter 42, and the input source of AC power to the power transmitter 13 A second switching relay 62 is provided to switch to the first DC / AC converter 51 or the second DC / AC converter 52. When the first power supply unit 31 is selected, the power transmission controller 14 uses the first AC / DC converter 41 as the input destination of the grid power, and the input source of the AC power to the power transmitter 13 is the first DC / AC. The switching relays 61 and 62 are controlled to be the converter 51. On the other hand, when the second power supply unit 32 is selected, the power transmission controller 14 uses the second AC / DC converter 42 as the input destination of the grid power, and the input source of the AC power to the power transmitter 13 Is controlled to be the second DC / AC converter 52.

According to this configuration, when one power supply unit is selected, the other power supply unit is electrically disconnected from the system power supply E and the power transmitter 13. This prevents the application of a voltage or the flow of current to the electrically disconnected power supply unit. Therefore, it can suppress that abnormality generate | occur | produces in the power supply part electrically interrupted.

More specifically, each switching relay 61, 62 is temporarily omitted, each AC / DC converter 41, 42 is always connected to the system power source E, and each DC / AC converter 51, 52 is always connected to the power transmitter 13. In this case, AC power output from one power supply unit may be input to the other power supply unit. That is, AC power may be input from the former power supply unit to the latter power supply unit. In this case, for example, a case may occur where AC power having the same voltage value as the first rated voltage value V1 is input to the second power supply unit 32. Then, problems such as occurrence of an abnormality in the latter power supply unit and deterioration of elements constituting the power supply unit may occur. On the other hand, according to the present embodiment, the switching relays 61 and 62 can electrically shut off the other power supply unit while the one power supply unit is in use, so that the above-mentioned inconvenience can be suppressed.

Moreover, according to this embodiment, alternating current power can be output using one power supply unit regardless of the switching mode of the switching element of the power supply unit not being used. As a result, even when the switching element of the power supply unit that is not in use is temporarily turned ON due to noise, AC power is normally output from the AC power supply 12. Therefore, it is possible to suppress the malfunction of the AC power supply 12 caused by the noise.

(5) The output voltage value and the output current value of the AC power supply 12 fluctuate according to the power supply load impedance Z. Specifically, the output voltage value of the AC power supply 12 becomes higher as the power supply load impedance Z becomes higher, and the output current value of the AC power supply 12 becomes higher as the power supply load impedance Z becomes lower.

In response to this, the power transmission controller 14 selects the first power supply unit 31 when the power supply load impedance Z, which is the input impedance of the power transmitter 13 (primary coil 13a), is higher than the threshold impedance Zth. When the power supply load impedance Z is lower than the threshold impedance Zth, the second power supply unit 32 is selected. Thereby, the fluctuation of the power supply load impedance Z can be suitably coped with.

(6) The power transmission side controller 14 is a power supply used to output a charging power having a larger power value than the test power based on the power supply load impedance Z in a state where the test power is output from the AC power supply 12 Select a department. As a result, since the selection of the power supply unit used to output the charging power is performed using the test power having a relatively small power value, the power loss related to the selection of the power supply unit can be reduced.

(7) The first rated voltage value V1 and the second rated current value I2 are set in correspondence with the positional deviation allowable range in which the positional deviation between the power transmitter 13 and the power receiver 23 is permitted. In detail, the power supply load impedance Z fluctuates in the range from the minimum power supply load impedance Zmin to the maximum power supply load impedance Zmax under the condition that the power receiver 23 fluctuates within the misalignment tolerance range. The first rated voltage value V1 is set according to the maximum power supply load impedance Zmax so that the AC power supply 12 can output the charging power when the power supply load impedance Z is the maximum power supply load impedance Zmax. The second rated current value I2 is set to correspond to the minimum power supply load impedance Zmin so that the AC power supply 12 can output the charging power when the power supply load impedance Z is the minimum power supply load impedance Zmin. Thus, the charging power can be output from the AC power supply 12 regardless of how the power transmitter 13 and the power receiver 23 are disposed within the positional deviation allowable range.

(8) Generally, the power loss (ON resistance) tends to be smaller in the second power supply unit 32 having a higher rated current value than the first power supply unit 31 having a high rated voltage value. In this respect, in the present embodiment, when the power transmission controller 14 can output the charging power regardless of which of the first power supply unit 31 and the second power supply unit 32 is selected, that is, the power supply load impedance Z is equal to the threshold impedance Zth. In this case, the second power supply unit 32 which is relatively easy to reduce the power loss is selected as the power supply unit for outputting the charging power. As a result, it is possible to reduce the power loss while enabling the output of the charging power.

The above embodiment may be modified as follows.
The first rated current value I1 may be set higher than the minimum current value for outputting the charging power under the condition that the power supply load impedance Z is the threshold impedance Zth. Similarly, the second rated voltage value V2 may be set higher than the minimum voltage value for outputting the charging power under the condition that the power supply load impedance Z is the threshold impedance Zth. In this case, the range of the power supply load impedance Z capable of outputting the charging power becomes wide regardless of which of the first power supply unit 31 and the second power supply unit 32 is selected.

In such a configuration, as shown in FIG. 5, the power transmission controller 14 can output the charging power using the second power supply unit 32 in step S201 after the power supply load impedance Z is determined in step S102. It may be determined whether or not. In detail, the power transmission controller 14 previously stores data on the range of the power supply load impedance Z that can output the charging power using the second power supply unit 32, and refers to the stored data with reference to the stored data. Make a decision. Then, if it is possible to output the charging power using the second power supply unit 32, the power transmission controller 14 selects the second power supply unit 32 in step S202, while the second power supply unit 32 is selected. If the charging power can not be output using this, the first power supply unit 31 is selected in step S203. Thereafter, the power transmission side controller 14 executes the process of step S106 and subsequent steps.

According to this configuration, in the configuration in which the range of the power supply load impedance Z capable of outputting the charging power is wide regardless of which of the first power supply unit 31 and the second power supply unit 32 is selected, the second Since the charging power is output using the power supply unit 32, the effect (8) can be more preferably obtained.

The power transmission controller 14 may select the first power supply unit 31 when the power supply load impedance Z is the threshold impedance Zth.
A plurality of first power supply units 31 may be provided. In addition, a plurality of second power supply units 32 may be provided.

○ The power transmission controller 14 selects one of the power supply units 31 and 32 based on the power supply load impedance Z in the situation where the test power is output from the AC power supply 12, and then uses the selected power supply unit. Although the configuration is such that the charging power whose power value is larger than the test power is output, the present invention is not limited to this. For example, the power transmission device 11 includes a measuring device that measures the output power value of the AC power supply 12, and the power transmission controller 14 outputs the charging power from the AC power supply 12 without outputting the test power. The second power supply unit 32 may be controlled. Then, the power transmission side controller 14 determines whether or not the charging power is output based on the measurement result of the measuring device, and when the charging power is output, the output of the charging power To continue. On the other hand, the power transmission controller 14 outputs charging power even when the output voltage value of the AC power supply 12 or the output voltage value of the second AC / DC converter 42 reaches the second rated voltage value V2. If not, the charging power may be output using the first power supply unit 31 instead of the second power supply unit 32.

The switching relays 61 and 62 may be omitted. In this case, it is preferable that the withstand voltage value of each of the power supply units 31 and 32 be set so that abnormality does not occur in the other power supply unit due to the AC power output from the one power supply unit.

In the embodiment, the power transmission side controller 14 selects the second power supply unit 32 as a power supply unit used to output the test power from the AC power supply 12. However, the present invention is not limited to this. You may choose.

○ Although the power supply load impedance Z is adopted as a parameter for selecting one of the power supply units 31 and 32, the invention is not limited to this, and any parameter that fluctuates according to the input impedance of the power transmitter 13 is arbitrary. . For example, conditions such as the output current value of the AC power supply 12 and the distance between the power transmitter 13 and the power receiver 23 may be adopted as a parameter for selecting one of the power supply units 31 and 32.

An impedance converter may be provided between the AC power supply 12 and the power transmitter 13 (primary coil 13a). In this case, the power supply load impedance Z depends on the input impedance of the transmitter 13. Therefore, in the configuration in which the impedance converter is provided as described above, it is possible to select one of the power supply units 31 and 32 based on the power supply load impedance Z (input impedance of the impedance converter). This is equivalent to selecting one of the power supply units 31 and 32 based on the input impedance of 13.

The first power supply unit 31 and the second power supply unit 32 may share one of the AC / DC converter and the DC / AC converter.
For example, as shown in FIG. 6, the AC power supply 12 is supplied with grid power, and includes an AC / DC converter 80 that converts grid power into DC power of a predetermined voltage value. The rated voltage value of the AC / DC converter 80 is set equal to or higher than the rated voltage value of the first AC / DC converter 41, and the rated current value of the AC / DC converter 80 is the second AC / DC converter It is set equal to or higher than the rated current value of the unit 42. The first switching relay 61 is provided between the AC / DC converter 80 and each of the DC / AC converters 51 and 52, and the output destination of the DC power converted by the AC / DC converter 80 is , Switching to the first DC / AC converter 51 or the second DC / AC converter 52. In this case, the first power supply unit 31 is configured of an AC / DC converter 80 and a first DC / AC converter 51. The second power supply unit 32 includes an AC / DC converter 80 and a second DC / AC converter 52.

In this configuration, when the first power supply unit 31 is selected, the power transmission controller 14 outputs the DC power of the AC / DC converter 80 and the AC power input source to the power transmitter 13 is the first DC. The switching relays 61 and 62 are controlled to become the / AC converter 51. On the other hand, when the second power supply unit 32 is selected, the power transmission controller 14 outputs the DC power of the AC / DC converter 80 and the AC power input source to the power transmitter 13 is the second DC / AC. The switching relays 61 and 62 are controlled to be the converter 52. Thereby, the effects such as the effect (1) are exhibited. Further, according to the present another example, by partially sharing the power supply units 31 and 32, the number of parts of the AC power supply 12 can be reduced. Therefore, the complication of the configuration of the AC power supply 12 can be suppressed.

The first power supply unit 31 and the second power supply unit 32 may share a DC / AC converter instead of sharing an AC / DC converter. For example, as shown in FIG. 7, when AC power is input, the AC power supply 12 converts the DC power into AC power and outputs the AC power to the power transmitter 13 and outputs the AC power to the power transmitter 13. Is equipped. The rated voltage value of the DC / AC converter 90 is set equal to or higher than the rated voltage value of the first DC / AC converter 51, and the rated current value of the DC / AC converter 90 is the second DC / AC conversion It is set to be equal to or higher than the rated current value of the switch 52. The second switching relay 62 is provided between each of the AC / DC converters 41 and 42 and the DC / AC converter 90, and an input source of DC power to the DC / AC converter 90 is a first AC. Switching to the DC / DC converter 41 or the second AC / DC converter 42. In this case, the first power supply unit 31 includes the first AC / DC converter 41 and the DC / AC converter 90, and the second power supply unit 32 includes the second AC / DC converter 42 and the DC / AC converter 90. And consists of.

In this configuration, when the first power supply unit 31 is selected, the power transmission controller 14 inputs the grid power and the DC power to the DC / AC converter 90 as the first AC / DC converter 41. Control switching relays 61 and 62 so that On the other hand, when the second power supply unit 32 is selected, the power transmission controller 14 causes the second AC / DC converter 42 to be the input destination of the grid power and the input source of the DC power to the DC / AC converter 90. Control switching relays 61 and 62. Thus, the effects such as the effect (1) can be achieved, and the configuration of the AC power supply 12 can be suppressed from being complicated by sharing a part of the power supply units 31 and 32.

However, the power loss of the AC / DC converter 80 tends to be larger than the power loss of each of the AC / DC converters 41 and 42, and the power loss of the DC / AC converter 90 is different from that of each DC / AC converter 51, It tends to be larger than 52 power loss. Therefore, from the viewpoint of improving the efficiency of the AC power supply 12, it is preferable that both the AC / DC converters 41 and 42 and the DC / AC converters 51 and 52 be provided.

(Circle) in said another example, although all the AC / DC converters were made common, it is not restricted to this, A part (for example, coil) of AC / DC converters may be made common. Similarly, part of the DC / AC converter may be shared.

○ The external power is not limited to the grid power, but may be DC power, for example. In this case, instead of the first AC / DC converter 41 and the second AC / DC converter 42, a first DC / DC converter as a first external power converter, and a second DC / DC as a second external power converter A converter may be provided. In this case, the rated voltage value and the rated current value of each DC / DC converter may be set corresponding to each AC / DC converter 41, 42. Similarly, when DC power is input as external power, a DC / DC converter may be provided instead of the AC / DC converter 80.

When DC power is input as external power, the AC / DC converters 41, 42, and 80 may be omitted. In this case, the first power supply unit 31 is a first DC / AC converter 51, and the second power supply unit 32 is a second DC / AC converter 52.

The specific circuit configuration of each of the AC / DC converters 41 and 42 and each of the DC / AC converters 51 and 52 is arbitrary. For example, each of the AC / DC converters 41 and 42 may be a step-up / step-down type instead of the step-up type, or may be configured to have a plurality of switching elements. Further, each DC / AC converter 51, 52 may be a class E amplifier or may be a bridge circuit in which four switching elements are bridge-connected.

○ Each of the AC / DC converters 41 and 42 has a rated voltage value equal to or greater than a first rated voltage value V1 and a rated current value equal to or greater than a second rated current value I2 instead of the coils L1 and L2, respectively. May be provided. That is, elements of the same specifications may be used for part of each element used in the first power supply unit 31 and part of each element used in the second power supply unit 32. The point is that the power supply units 31 and 32 are configured such that the rated voltage values V1 and V2 and the rated current values I1 and I2 of the entire power supply units 31 and 32 have the above-described relationship (V1> V2 and I2> I1). If it is, the specific specifications (rated voltage value and rated current value) for each element are arbitrary.

○ In a configuration in which the load 22 includes a vehicle battery whose impedance varies according to the input power value, DC / DC having a switching element that turns on / off periodically between the rectifier and the vehicle battery A converter may be provided. In this case, regardless of the output power value of the AC power supply 12, the power reception side controller 24 changes the impedance of the vehicle battery so that the impedance from the input end of the DC / DC converter to the vehicle battery becomes a constant value. The ON / OFF duty ratio of the switching element may be adjusted correspondingly. Thereby, even when the impedance of the vehicle battery fluctuates, the impedance of the load 22 becomes constant. That is, the load 22 is a fixed load having the same impedance regardless of the power value of the input AC power. Thus, it is possible to select the power supply unit using the test power without considering the impedance of the vehicle battery which fluctuates between the output of the test power and the output of the charging power. Therefore, the accuracy of the selection of the power supply unit can be improved.

The load 22 is not limited to the above another example, and the load 22 may be a fluctuating load whose impedance fluctuates according to the power value of the input AC power. In this case, the power receiving device 21 separately from the load 22 has the fixed load having a constant impedance regardless of the input power value, and the output destination of the AC power received by the power receiver 23 as the load 22 or the fixed load. It is good to have a relay to switch to In this case, when the test power is output from the AC power supply 12, the power receiving controller 24 may switch the output destination of the AC power received by the power receiver 23 to the fixed load. Thus, the power supply unit can be selected without considering the change in the impedance of the load 22.

The power transmission controller 14 may determine that the power supply load impedance Z determined in step S102 is abnormal if it is out of the range from the minimum power supply load impedance Zmin to the maximum power supply load impedance Zmax. In this case, the power transmission controller 14 may terminate the charging control process without executing the process of step S103 and on, or may notify the user to move the vehicle until the power supply load impedance Z falls within the above range. The process of step S103 and subsequent steps may be performed based on the fact that the power supply load impedance Z falls within the above range.

The power transmission controller 14 may start the charge control process while the vehicle is moving. In this case, the power transmission controller 14 periodically grasps the power supply load impedance Z while the vehicle is moving, and stops the vehicle based on the grasped power supply load impedance Z falling within the above range. It is good to execute the vehicle stop process of Thus, the vehicle can be guided to a position where the AC power supply 12 can output the charging power. Although the specific configuration of the vehicle stop process is optional, for example, in a process of giving a notification to stop the vehicle or in a vehicle equipped with an assist function, the vehicle is determined using the assist function. It is a process to stop automatically.

The power receiving controller 24 may execute the charge control process. In this case, the power transmission controller 14 may appropriately transmit information (power supply load impedance Z and the like) necessary for the charge control process to the power reception controller 24. The power receiving controller 24 may transmit a request signal of AC power to the power transmission controller 14, and the power transmission controller 14 may control the AC power supply 12 based on the reception of the request signal.

The AC power supply 12 is a voltage source, but may be a power source or a current source.
○ Although the resonant frequency of the power transmitter 13 and the resonant frequency of the power receiver 23 were set to be the same,
The present invention is not limited to this, and both may be different within the range in which power transmission is possible.

Although the power transmitter 13 and the power receiver 23 have the same configuration, the present invention is not limited to this, and different configurations may be used.
The capacitors 13b and 23b may be omitted. In this case, magnetic field resonance is performed using the parasitic capacitances of the coils 13a and 23a.

In the embodiment, the primary coil 13a and the primary capacitor 13b are connected in parallel. However, the present invention is not limited to this, and both may be connected in series. Similarly, the secondary coil 23a and the secondary capacitor 23b may be connected in series.

The load 22 is not limited to the vehicle battery and is optional.
In the embodiment, magnetic field resonance is used to realize non-contact power transmission. However, the present invention is not limited to this, and electromagnetic induction may be used.

The power transmitter 13 may have a resonant circuit including the primary coil 13a and the primary capacitor 13b, and a primary coupling coil coupled to the resonant circuit by electromagnetic induction. Similarly, the power receiver 23 may have a resonant circuit including a secondary coil 23a and a secondary capacitor 23b, and a secondary coupling coil coupled to the resonant circuit by electromagnetic induction.

Each of the power transmission side controller 14, the power reception side controller 24, and the impedance measuring device 70 may be configured by any programmed electric circuit such as a microcomputer, a processor, an electronic control device, and the like.

Claims (12)

1. An AC power supply that outputs AC power of a predetermined frequency;
   A primary coil to which the AC power is input;
   A power transmitting device configured to transmit AC power without contact to the secondary coil of the power receiving device having a secondary coil,
   The AC power supply includes a first power supply unit and a second power supply unit, and each of the first power supply unit and the second power supply unit converts the external power into the AC power when external power is input. Configured to output,
   The rated voltage value of the first power supply unit is higher than the rated voltage value of the second power supply unit,
   The rated current value of the second power supply unit is higher than the rated current value of the first power supply unit,
   A power transmission device in which either the first power supply unit or the second power supply unit is selected as a power supply unit to which the external power is input and which outputs the AC power toward the primary side coil.
2. The first power supply unit includes a first switching element, and the first switching element is periodically turned ON / OFF to convert the external power into the AC power and output the AC power.
   The second power supply unit includes a second switching element, and the second switching element is periodically turned ON / OFF to convert the external power into the AC power and output the AC power.
   The rated voltage value of the first switching element is higher than the rated voltage value of the second switching element,
   The rated current value of the second switching element is higher than the rated current value of the first switching element,
   The first switching element is periodically turned ON / OFF when the external power is input, and the first power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil. And
   The second switching element is periodically turned ON / OFF when the external power is input, and the second power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil. The power transmission device according to claim 1.
3. Having an input impedance of the primary coil,
   When the input impedance of the primary side coil is higher than a predetermined threshold impedance, the external power is input, and the power supply unit that outputs the AC power toward the primary side coil is used as the power supply unit. 1 power supply unit is selected,
   When the input impedance of the primary side coil is lower than the threshold impedance, the external power is input, and the second power supply unit as a power supply unit that outputs the AC power toward the primary side coil The power transmission device according to claim 1 or 2, wherein is selected.
4. The external power is input based on the input impedance of the primary coil in a situation where the first AC power as the AC power is output from the AC power supply, and the power is directed to the primary coil. The power transmission device according to claim 3, wherein a power supply unit that outputs a second AC power having a power value larger than that of the first AC power is selected.
5. If it is possible to output AC power of a predetermined specific power value toward the primary side coil regardless of which of the first power supply unit and the second power supply unit is selected, the second power supply unit is The power transmission device according to any one of claims 1 to 4, which is selected.
6. The AC power supply is supplied with the external power, and includes an external power conversion unit that converts the external power into DC power of a predetermined voltage value.
   The first power supply unit includes a first DC / AC conversion unit that converts the DC power into the AC power when the DC power converted by the external power conversion unit is input, and the first power supply unit Is constituted by the external power converter and the first DC / AC converter,
   The second power supply unit includes a second DC / AC conversion unit that converts the DC power into the AC power when the DC power converted by the external power conversion unit is input, and the second power supply unit Is constituted by the external power converter and the second DC / AC converter,
   The rated voltage value of the first DC / AC conversion unit is higher than the rated voltage value of the second DC / AC conversion unit,
   The power transmission device according to any one of claims 1 to 5, wherein a rated current value of the second DC / AC conversion unit is higher than a rated current value of the first DC / AC conversion unit.
7. The power transmission device is
   A first switching unit configured to switch an output destination of the DC power converted by the external power conversion unit to the first DC / AC conversion unit or the second DC / AC conversion unit;
   A second switching unit that switches an input source of the AC power to the primary coil to the first DC / AC conversion unit or the second DC / AC conversion unit;
   And further
   Each of the first switching unit and the second switching unit is
   When the external power is input and the first power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil, the output destination and the input source are the first DC Switch to become the / AC converter,
   When the external power is input and the second power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil, the output destination and the input source are the second DC The power transmission device according to claim 6, wherein the power transmission device is switched so as to be a / AC conversion unit.
8. The AC power supply includes a DC / AC conversion unit that converts the DC power into the AC power when the DC power is input, and outputs the converted AC power to the primary side coil.
   The first power supply unit includes a first external power conversion unit that converts the external power into direct current power of a predetermined voltage value, and the first power supply unit includes the DC / AC conversion unit and the first external power conversion. Composed of parts and
   The second power supply unit includes a second external power conversion unit that converts the external power into direct current power of a predetermined voltage value, and the second power supply unit includes the DC / AC conversion unit and the second external power conversion. Composed of parts and
   The rated voltage value of the first external power converter is higher than the rated voltage value of the second external power converter,
   The power transmission device according to any one of claims 1 to 5, wherein a rated current value of the second external power conversion unit is higher than a rated current value of the first external power conversion unit.
9. The power transmission device is
   A first switching unit that switches an input destination of the external power to the first external power conversion unit or the second external power conversion unit;
   A second switching unit that switches an input source of the DC power to the DC / AC conversion unit to the first external power conversion unit or the second external power conversion unit;
   Equipped with
   Each of the first switching unit and the second switching unit is
   When the external power is input and the first power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil, the input destination and the input source are the first Switch to become an external power converter,
   When the external power is input and the second power supply unit is selected as a power supply unit that outputs the AC power toward the primary side coil, the input destination and the input source are the second The power transmission device according to claim 8, which is switched to be an external power converter.
10. The first power supply unit converts the external power into a direct current power of a predetermined voltage value, and converts the direct current power converted by the first external power conversion unit into the alternating current power. First DC / AC converter,
    The second power supply unit converts the external power into direct current power of a predetermined voltage value, and converts the direct current power converted by the second external power conversion unit into alternating current power. And a second DC / AC converter,
    The rated voltage value of the first external power conversion unit is higher than the rated voltage value of the second external power conversion unit, and the rated voltage value of the first DC / AC conversion unit is the rating of the second DC / AC conversion unit Higher than the voltage value,
    The rated current value of the second external power conversion unit is higher than the rated current value of the first external power conversion unit, and the rated current value of the second DC / AC conversion unit is the rating of the first DC / AC conversion unit The power transmission device according to any one of claims 1 to 5, which is higher than a current value.
11. A first switching unit that switches an input destination of the external power to the first external power conversion unit or the second external power conversion unit;
    A second switching unit that switches an input source of the AC power to the primary coil to the first DC / AC conversion unit or the second DC / AC conversion unit;
    Equipped with
    Each of the first switching unit and the second switching unit is
    When the external power is input and the first power supply unit is selected as a power supply unit for outputting the AC power toward the primary side coil, the input destination is the first external power conversion unit And the input source is switched to be the first DC / AC converter,
    When the external power is input and the second power supply unit is selected as a power supply unit for outputting the AC power toward the primary side coil, the input destination is the second external power conversion unit The power transmission device according to claim 10, wherein the input source is switched to be the second DC / AC conversion unit.
12. An AC power supply that outputs AC power of a predetermined frequency;
    A primary coil to which the AC power is input;
    A secondary coil configured to contactlessly receive the AC power input to the primary coil;
    Contactless power transmission device comprising
    The AC power supply includes a first power supply unit and a second power supply unit, and each of the first power supply unit and the second power supply unit converts the external power into the AC power when the external power is input. Configured to output
    The rated voltage value of the first power supply unit is higher than the rated voltage value of the second power supply unit,
    The rated current value of the second power supply unit is higher than the rated current value of the first power supply unit,
    The non-contact power transmission apparatus is a power supply unit which receives the external power and which outputs the alternating current power toward the primary side coil of either the first power supply unit or the second power supply unit. The contactless energy transfer apparatus provided with the selection part to select.

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