JP5488723B2 - Resonant contactless power supply system - Google Patents

Description

  The present invention relates to a resonance type non-contact power feeding system. Specifically, the present invention relates to a resonance-type non-contact power feeding system suitable for charging a secondary battery mounted on a moving body in a non-contact manner.

  The charging system proposed by Japanese Patent Laying-Open No. 2009-106136 (Patent Document 1) charges an in-vehicle power storage device by receiving charging power wirelessly by a resonance method from a power source outside the vehicle. The charging system of the document includes an electric vehicle and a power feeding device, and the electric vehicle includes a secondary self-resonant coil, that is, a secondary resonance coil, a secondary coil, a rectifier, and a power storage device. The power feeding device includes a high-frequency power driver, a primary coil, and a primary self-resonant coil, that is, a primary-side resonant coil. The number of turns of the secondary self-resonant coil is set based on the voltage of the power storage device, the distance between the primary self-resonant coil and the secondary self-resonant coil, and the resonance frequency of the primary self-resonant coil and the secondary self-resonant coil. Is done. The distance between the power feeding device and the vehicle changes depending on the vehicle status, for example, the loading status and the tire air pressure. When the distance between the primary self-resonant coil of the power feeding device and the secondary self-resonant coil of the vehicle changes, the resonance frequencies of the primary self-resonant coil and the secondary self-resonant coil change. Therefore, in the electric vehicle disclosed in the above document, a variable capacitor is connected between the ends of the conductive wires of the secondary self-resonant coil. When charging the power storage device, the charging system described in the document calculates the charging power of the power storage device based on the detection values of the voltage sensor and the current sensor. The charging system adjusts the LC resonance frequency of the secondary self-resonant coil by adjusting the capacitance of the variable capacitor connected to the secondary self-resonant coil so that the charging power is maximized, and It is disclosed in the literature.

JP 2009-106136 A

  As described above, the purpose of the power feeding method disclosed in the above document is also when the distance between the primary self-resonant coil and the secondary self-resonant coil changes depending on the vehicle situation, that is, the loading situation, tire pressure, etc. The purpose is to efficiently supply power from the power feeding side to the power receiving side. For this purpose, the power feeding method adjusts the capacity of the variable capacitor of the secondary self-resonant coil when charging the power storage device so that the charging power of the power storage device is maximized. However, in such a power supply method, it is necessary to calculate the charging power of the power storage device based on the detection values of the voltage sensor and the current sensor, and to adjust the capacity of the variable capacitor until the charging power becomes maximum.

  If the power receiving side (moving body side) can detect the distance between the resonance coil on the power feeding side and the resonance coil on the power receiving side, the power receiving side adjusts the matching unit on the power receiving side according to the distance. Can efficiently supply power to the power receiving side. However, by providing a general distance sensor in the moving body, when the distance sensor detects the distance between the moving body and the power supply facility, the distance between the primary resonance coil and the secondary resonance coil is accurately determined. It is difficult to detect.

  An object of the present invention is to detect a distance between a resonance coil on a power feeding side and a resonance coil provided on a power receiving side on a moving body side by using a matching unit provided on the power receiving side. Therefore, an object of the present invention is to provide a resonance type non-contact power feeding system that can efficiently supply power from the power feeding side to the power receiving side.

  In order to achieve the above object, according to one aspect of the present invention, a resonant non-contact power feeding system including a power feeding facility and a moving body facility is provided. The power supply facility includes an AC power source and a primary resonance coil that receives power from the AC power source. The mobile facility includes a secondary resonance coil that receives power from the primary resonance coil; a rectifier that rectifies the power received by the secondary resonance coil; and power that is rectified by the rectifier Secondary battery. The mobile facility further includes a secondary matching unit and a distance measuring high-frequency power source between the secondary resonance coil and the rectifier. When the distance between the primary side resonance coil and the secondary side resonance coil is detected, the output of the distance measurement high frequency power supply is supplied to the secondary side resonance coil via the secondary matching unit. Configured to be When the power supply facility supplies power, the distance measuring high-frequency power supply is stopped, and the power supplied by the power supply facility is supplied to the secondary battery via the secondary matching device and the rectifier. Configured.

  According to this configuration, the distance between the primary resonance coil and the secondary resonance coil is detected prior to the supply of power from the power supply facility to the secondary battery of the mobile facility. At the time of this distance detection, the output of the distance measuring high-frequency power supply is not supplied to the secondary battery side but is supplied to the secondary resonance coil. For this reason, the input impedance of the resonance system is not affected by the state of charge of the secondary battery.

  "Resonance system" is a circuit component that has a primary side resonance coil and a secondary side resonance coil, and is present between the high frequency power source for distance detection and the secondary side resonance coil at the time of distance detection in mobile equipment. For example, it includes a secondary matching unit and a secondary coil, and circuit parts such as a primary coil and a primary matching unit that exist between the primary resonance coil of the power supply facility and the AC power source. On the other hand, when the secondary side resonance coil receives power from the primary side resonance coil, the “resonance system” is a circuit component that exists between the AC power source and the primary side resonance coil, such as a primary matching device and a primary coil. And a rectifier and a secondary battery to which power is supplied from the secondary resonance coil, and further, circuit components such as a secondary matching device and a secondary coil existing between the secondary resonance coil and the rectifier are referred to as “resonance system”. Is included.

  The “resonance system input impedance” is the total resonance system measured between both ends of the input side coil to which alternating current is input when detecting the distance between the primary side resonance coil and the secondary side resonance coil. Refers to impedance. For example, when alternating current is input from a high-frequency power source for distance detection of a mobile equipment, and the secondary coil device is composed of a secondary coil and a secondary resonance coil, the “resonance system input impedance” is the secondary The impedance of the entire resonance system measured between both ends of the coil. Alternatively, when the secondary coil device is only the secondary side resonance coil, the “resonance system input impedance” indicates the impedance of the entire resonance system measured between both ends of the secondary side resonance coil. On the other hand, when the secondary resonance coil receives power from the primary resonance coil, the “resonance system input impedance” is the primary coil when the primary coil device is composed of the primary coil and the primary resonance coil. The impedance of the entire resonance system measured between both ends of the. Alternatively, when the primary coil device is configured by only the primary side resonance coil, the “resonance system input impedance” indicates the impedance of the entire resonance system measured between both ends of the primary side resonance coil.

Therefore, the resonance type non-contact power feeding system can detect the distance between the primary side resonance coil and the secondary side resonance coil by measuring the input impedance of the resonance system. Then, power supply from the power supply facility to the mobile facility is performed in a state where the detected distance is a value suitable for power supply from the power supply facility to the mobile facility. When power is supplied from the power supply facility to the secondary battery of the mobile facility, the impedance of the secondary matching unit is adjusted to a value at which power is efficiently supplied from the power supply facility to the mobile facility at the detected distance. Then, with the output of the distance measurement high-frequency power supply stopped, power is supplied from the primary resonance coil of the power supply facility to the secondary resonance coil by non-contact resonance. The electric power received by the secondary resonance coil is supplied to the secondary battery via the secondary matching device and the rectifier, so that the secondary battery is charged. Therefore, the resonance-type non-contact power feeding system uses the secondary matching unit provided on the power receiving side, so that the primary side resonance coil on the power feeding side and the secondary side resonance coil equipped on the mobile body on the power receiving side. Can be detected on the mobile body side and power can be efficiently supplied from the power supply side to the power reception side.

  Preferably, the secondary matching unit is a π-type, and the distance measuring high-frequency power supply supplies power to the secondary matching unit. In this case, the secondary matching unit is bidirectional when supplying power from the power supply facility to the secondary battery of the mobile facility and when detecting the distance between the primary resonance coil and the secondary resonance coil. It works without trouble.

Preferably, the mobile facility may further include a charger provided between the rectifier and the secondary battery . The electric power rectified by the rectifier may be supplied to the charger, and the secondary battery may be connected to the charger.

  Also with this configuration, the distance between the primary resonance coil and the secondary resonance coil is detected prior to the supply of power from the power supply facility to the charger of the mobile facility. At the time of this distance detection, the output of the distance measurement high frequency power supply is not supplied to the charger side but is supplied to the secondary resonance coil. For this reason, the input impedance of the resonance system is not affected by the influence of the charger or the state of charge of the secondary battery.

Other features and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings that illustrate the features of the invention.
The features believed to be novel of the invention are particularly apparent in the appended claims. The present invention with objects and advantages will be understood by reference to the following description of the presently preferred embodiment, taken in conjunction with the accompanying drawings, in which:

The block diagram of the resonance-type non-contact electric power feeding system of 1st Embodiment. The circuit diagram which a part of resonance type non-contact electric power feeding system of Drawing 1 was omitted. The block diagram of the mobile body installation in 2nd Embodiment. FIG. 4 is a circuit diagram showing a configuration of a secondary matching device in FIG. 3. The circuit diagram which shows the effect | action of the secondary matching device of FIG. 4A. The circuit diagram which shows the structure of the secondary matching device of 3rd Embodiment. The circuit diagram of the electric power feeding installation of 4th Embodiment.

1 and 2 illustrate a first embodiment in which the present invention is embodied in a resonance type non-contact power feeding system for charging an in-vehicle battery.
As shown in FIG. 1, the resonance-type non-contact power feeding system includes a power feeding facility 10 and a moving body facility 20, and the power feeding facility 10 is a power transmission side facility provided on the ground side. The moving body facility 20 is a power receiving side facility mounted on a vehicle as a moving body.

  The power supply facility 10 is a power supply side facility including a high-frequency power source 11, a primary matching device 12, a primary coil device 13, and a power supply controller 14. A power on / off signal is sent to the high frequency power supply 11 as an AC power supply from a power supply controller 14 as a power supply side controller, and the high frequency power supply 11 is turned on / off by this signal. The high frequency power supply 11 outputs AC power having a frequency equal to a preset resonance frequency of the resonance system, for example, high frequency power of about several MHz.

As shown in FIG. 2, the primary coil device 13 is a primary coil that includes a primary coil 13 a and a primary resonance coil 13 b. The primary coil 13 a is connected to the high frequency power supply 11 through the primary matching unit 12. The primary coil 13a and the primary side resonance coil 13b are disposed so as to be coaxially arranged, and a capacitor C is connected in parallel to the primary side resonance coil 13b. The primary coil 13a is coupled to the primary resonance coil 13b by electromagnetic induction, and the AC power supplied from the high frequency power supply 11 to the primary coil 13a is supplied to the primary resonance coil 13b by electromagnetic induction.

  As shown in FIG. 2, the primary matching unit 12 is a primary side matching unit composed of a π-type matching unit. More specifically, the primary matching unit 12 includes two primary variable capacitors 15 and 16 serving as variable reactances and a primary inductor 17. One primary variable capacitor 15 is connected to the high frequency power supply 11, and the other primary variable capacitor 16 is connected in parallel to the primary coil 13a. The primary inductor 17 is connected between both primary variable capacitors 15 and 16. The impedance of the primary matching unit 12 is changed by changing the capacitances of the primary variable capacitors 15 and 16. The primary variable capacitors 15 and 16 have a known configuration having, for example, a rotating shaft driven by a motor (not shown). When the motor is driven by a drive signal from the power supply controller 14, the primary variable capacitors 15 and 16 are respectively provided. The capacity of is changed.

  As shown in FIG. 1, the mobile equipment 20 includes a secondary coil device 21, a secondary matching device 22, a distance measurement high-frequency power source 23, a rectifier 24, a charger 25, a secondary battery 26, and a vehicle controller 27. It is the moving body side equipment. The secondary battery 26 is a battery connected to the charger 25. The secondary matching unit 22 can be switched between a state connected to the distance measuring high-frequency power source 23 via the switch SW1 and a state connected to the rectifier 24 via the switch SW1. The distance measurement high-frequency power supply 23 is a distance measurement high-frequency power supply configured to output AC power that is about two orders of magnitude smaller than the AC current output by the high-frequency power supply 11 during power transmission.

  As shown in FIG. 2, in detail, the secondary coil device 21 is a secondary coil composed of a secondary coil 21a and a secondary resonance coil 21b. The secondary coil 21a and the secondary side resonance coil 21b are disposed so as to be coaxially arranged, and a capacitor C different from the primary side resonance coil 13b is connected to the secondary side resonance coil 21b. The secondary coil 21a is coupled to the secondary resonance coil 21b by electromagnetic induction. That is, AC power supplied from the primary side resonance coil 13b to the secondary side resonance coil 21b by resonance is supplied to the secondary coil 21a by electromagnetic induction. The secondary coil 21 a is connected to the secondary matching unit 22.

  As shown in FIG. 2, the secondary matching unit 22 is a secondary matching unit configured by a π-type matching unit. More specifically, the secondary matching unit 22 is composed of two secondary variable capacitors 28 and 29 as variable reactances and a secondary inductor 30. One secondary variable capacitor 28 is connected in parallel to the secondary coil 21a. The other secondary variable capacitor 29 is selectively connected to one of the distance measurement high-frequency power supply 23 and the rectifier 24 via the switch SW1. When the capacitances of the secondary variable capacitors 28 and 29 are changed, the impedance of the secondary matching unit 22 is changed. Each of the secondary variable capacitors 28 and 29 has a known configuration having, for example, a rotating shaft driven by a motor (not shown), and when the motor is driven by a drive signal from the vehicle controller 27, the secondary variable capacitors 28 and 29 are provided. Each capacity is changed.

As shown in FIG. 2, the voltage sensor 31 as an input impedance measuring unit is connected in parallel to the secondary coil 21a.
The charger 25 shown in FIG. 1 includes a DC / DC converter (not shown) that converts the direct current rectified by the rectifier 24 into a voltage suitable for charging the secondary battery 26. The vehicle controller 27 controls the switching element of the DC / DC converter of the charger 25 when the secondary battery 26 is charged.

  Note that the number of turns and the diameter of each of the primary coil 13a, the primary side resonance coil 13b, the secondary side resonance coil 21b, and the secondary coil 21a are the power to be supplied (transmitted) from the power supply facility 10 to the mobile facility 20. It is set as appropriate according to the size of. The switch SW1 indicates the c contact of the relay. In FIG. 1 and FIG. 2, the c contact of the relay is illustrated as a contact type. However, the contact is not limited thereto, and the c contact of the switch SW <b> 1 may be configured by a non-contact relay using a semiconductor element, for example.

  When the vehicle controller 27 as a control device detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b, the secondary matching unit 22 and the distance measurement high-frequency power source 23 are connected to each other by the switch SW1. This is a vehicle-side controller. Further, when power is supplied from the power supply facility 10 to the mobile facility 20, the vehicle controller 27 controls the switch SW1 so that the secondary matching device 22 and the rectifier 24 are connected to each other by the switch SW1. Further, when detecting the distance between the primary resonance coil 13b and the secondary resonance coil 21b, the vehicle controller 27 causes the distance measurement high-frequency power source 23 to output an alternating current of a predetermined frequency. Furthermore, the vehicle controller 27 controls the distance measurement high-frequency power source 23 to stop the output of the distance measurement high-frequency power source 23 when power is supplied from the power supply facility 10 to the moving body facility 20.

  The vehicle controller 27 includes an in-vehicle CPU and an in-vehicle memory. The in-vehicle memory is data indicating the relationship between the distance between the primary resonance coil 13b and the secondary resonance coil 21b and the input impedance of the resonance system when alternating current of a predetermined frequency is output from the distance measurement high frequency power supply 23. Are stored as a map or a relational expression. This data is obtained in advance by testing. When the vehicle controller 27 detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b, the voltage sensor 31 detects the voltage at both ends of the secondary coil 21a, thereby inputting the resonance system. Measure impedance. The vehicle controller 27 calculates the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b based on the detected input impedance of the resonance system and the map or the relational expression. Thus, the vehicle controller 27 functions as a distance calculation unit that calculates the distance between the primary resonance coil 13b and the secondary resonance coil 21b. The vehicle controller 27 and the voltage sensor 31 constitute a distance detection unit that detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b.

  The power supply controller 14 and the vehicle controller 27 can communicate with each other via a wireless communication device (not shown). When the power supply controller 14 receives the power supply request signal transmitted from the vehicle controller 27, the power supply controller 14 performs a power supply operation.

(Function)
Next, the operation of the resonance type non-contact power feeding system configured as described above will be described.
When the secondary battery 26 mounted on the vehicle is charged, the vehicle needs to park (stop) at a charging position where the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b is a predetermined distance. There is. Therefore, prior to supplying power from the power supply facility 10 to the charger 25 of the mobile facility 20, it is necessary to detect the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b. When detecting the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b, the vehicle controller 27 switches the switch SW1 to a state in which the secondary matching unit 22 and the distance measurement high-frequency power source 23 are connected to each other. . In this state, when the distance measurement high-frequency power source 23 outputs AC power having a predetermined frequency, the power is transmitted from the secondary coil device 21 to the primary coil device 13 in a non-contact manner. At this time, the output of the distance measurement high-frequency power source 23 is not supplied to the charger 25 side but is supplied only to the secondary resonance coil 21b. For this reason, the input impedance of the resonance system is not affected by the state of charge by the charger 25 or the secondary battery 26. In this state, the vehicle controller 27 calculates the input impedance of the secondary coil 21a based on the detection signal of the voltage sensor 31, and based on the value of this input impedance and the map or relational expression, the primary resonance coil 13b. Is detected (calculated or calculated) between the first resonance coil 21b and the secondary resonance coil 21b.

  If the distance between the primary resonance coil 13b and the secondary resonance coil 21b detected as described above is a distance suitable for charging, the vehicle controller 27 switches the switch SW1 to the secondary matcher 22. The rectifier 24 is switched to a state of being connected to each other. Then, the vehicle controller 27 sets the secondary variable capacitors 28 and 29 so that the impedance of the secondary matching unit 22 becomes a value at which electric power is efficiently supplied from the power supply equipment 10 to the mobile equipment 20 at the detected distance. adjust. Thereafter, the vehicle controller 27 transmits a power supply request signal to the power supply controller 14 via the wireless communication device. When the power supply controller 14 receives the power supply request signal from the vehicle controller 27, the power supply controller 14 starts power supply.

  If the detected distance is not a suitable distance for charging, the vehicle controller 27 detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b after the vehicle is moved as described above. Run. If the detected distance is suitable for charging, the vehicle controller 27 switches the switch SW1 and adjusts the impedance of the secondary matching unit 22 in the same manner as described above, and then sends a power supply request signal to the power supply controller 14. Send.

  The power supply controller 14 that has received the power supply request signal applies an AC voltage having a resonance frequency to the primary coil 13 a by the high frequency power supply 11 of the power supply facility 10. Then, electric power is supplied from the primary side resonance coil 13b to the secondary side resonance coil 21b by non-contact resonance. The electric power received by the secondary resonance coil 21b is supplied to the charger 25 via the secondary matching device 22 and the rectifier 24, so that the secondary battery 26 connected to the charger 25 is charged. For example, the vehicle controller 27 determines the completion of charging based on the elapsed time from when the voltage of the secondary battery 26 becomes a predetermined voltage, and transmits a charging completion signal to the power supply controller 14 when the charging of the secondary battery 26 is completed. . When receiving the charge completion signal, the power supply controller 14 ends the power transmission.

This embodiment has the following advantages.
(1) The resonance-type non-contact power feeding system includes a power feeding facility 10 and a moving body facility 20. The power feeding facility 10 includes a high frequency power source 11 as an AC power source, and a primary resonance coil 13b that receives power from the AC power source. With. The mobile facility 20 is supplied with electric power from the power supply facility 10 in a non-contact manner. That is, the mobile facility 20 is rectified by the secondary resonance coil 21b that receives power from the primary resonance coil 13b, the rectifier 24 that rectifies the power received by the secondary resonance coil 21b, and the rectifier 24. A charger 25 to which electric power is supplied and a secondary battery 26 connected to the charger 25 are provided. The mobile facility 20 includes a secondary matching unit 22 and a distance measuring high-frequency power source 23 between the secondary resonance coil 21 b and the rectifier 24. In order to detect the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b, the output of the distance measurement high frequency power supply 23 is supplied to the secondary side resonance coil 21b via the secondary matching unit 22. The When the power supply facility 10 supplies power, the distance measurement high-frequency power supply 23 is stopped, and the power output from the power supply facility 10 is supplied to the charger 25 via the secondary matching device 22 and the rectifier 24. Therefore, the power feeding system according to the present embodiment uses the secondary matching unit 22 provided on the power receiving side, that is, the mobile facility 20, so that the resonance coil on the power feeding side, that is, the primary resonance coil 13b, and the movement on the power receiving side. The distance between the resonance coil mounted on the body, that is, the secondary resonance coil 21b can be detected on the moving body side. By using the distance thus detected, the power feeding system can efficiently supply power from the power feeding side to the power receiving side.

(2) The mobile facility 20 can detect the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b. Therefore, the driver can easily move the moving body to the charging position where power can be efficiently supplied from the power supply facility 10. Therefore, the secondary battery 26 mounted on the moving body can be charged efficiently.

  (3) As the secondary matching unit 22, a π-type matching unit composed of two secondary variable capacitors 28 and 29 and one secondary inductor 30 is used. Accordingly, the impedance of the resonance system is greatly adjusted by adjusting one variable capacitor, for example, the secondary variable capacitor 28, and the impedance of the resonance system is finely adjusted by adjusting the other variable capacitor, for example, the secondary variable capacitor 29. This makes it possible to easily adjust the impedance of the resonance system.

  (4) The mobile facility 20 includes an input impedance measurement unit (voltage sensor 31) that measures the input impedance of the resonance system in a state where AC power is output from the distance measurement high-frequency power source 23, and a distance calculation unit (vehicle controller 27). And. Based on the relationship between the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b and the input impedance of the resonance system, the distance calculation unit includes the primary side resonance coil 13b and the secondary side resonance coil 21b. The distance between is calculated. Accordingly, the mobile facility 20 can detect the distance between the primary resonance coil 13b and the secondary resonance coil 21b without communicating with the power supply facility 10.

  3 and 4 illustrate a second embodiment. In this embodiment, the configuration of the power supply facility 10 is the same as that of the first embodiment, but the configuration of the secondary matching unit 22 and the connection state of the distance measurement high-frequency power source 23 are different from those of the first embodiment. . The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the mobile equipment 20 includes a secondary coil device 21, a secondary matching device 22 </ b> A, a distance measurement high-frequency power source 23, a rectifier 24, a charger 25, a secondary battery 26, and a vehicle controller 27. Yes. The distance measuring high-frequency power source 23 is connected to the secondary matching unit 22. The secondary battery 26 is a battery connected to the charger 25.

  As shown in FIGS. 4A and 4B, the secondary matching unit 22A is configured by a π-type matching unit. More specifically, the secondary matching unit 22A includes two secondary variable capacitors 28 and 29, a secondary inductor 30, and a switch SW2. One secondary variable capacitor 28 is connected to the secondary coil 21 a, and the other secondary variable capacitor 29 is connected to the rectifier 24. One end of the secondary inductor 30 is connected to the secondary coil 21a and the secondary variable capacitor 28, and the other end of the secondary inductor 30 is connected to the rectifier 24 and the secondary variable capacitor 29 via the switch SW2. Yes. The output terminal of the distance measurement high-frequency power supply 23 is connected between the other end of the secondary inductor 30 and the switch SW2. The switch SW2 indicates a relay contact. 4A and 4B, the contact of the relay of the switch SW2 is shown as a contact type, but the present invention is not limited to this, and the switch SW2 may be configured by a non-contact relay using a semiconductor element. 4A and 4B, the voltage sensor 31 is not shown.

  In this embodiment, when the vehicle controller 27 detects the distance between the primary resonance coil 13b and the secondary resonance coil 21b, the vehicle controller 27 holds the switch SW2 in an opened state as shown in FIG. 4A. The distance measurement high frequency power supply 23 is instructed to output AC power. The AC power output from the distance measurement high-frequency power supply 23 is supplied to the secondary coil 21a side without being supplied to the rectifier 24 side. In this state, similarly to the first embodiment, the vehicle controller 27 calculates the input impedance of the resonance system from the detection signal of the voltage sensor 31, and from the calculation result, the primary side resonance coil 13b and the secondary side resonance coil. The distance to 21b is detected.

In addition to the distance detection, as shown in FIG. 4B, the vehicle controller 27 holds the switch SW2 in a closed state and commands to stop the output of the AC power from the distance measurement high-frequency power source 23. When the power supply facility 10 performs non-contact power supply, the power received by the secondary resonance coil 21b is supplied to the charger 25 via the secondary matching device 22A and the rectifier 24, and 2 connected to the charger 25. The secondary battery 26 is charged.

The second embodiment has the following effects in addition to the same effects as (2) to (4) of the first embodiment.
(5) The secondary matching unit 22A is a π type. A switch SW2 is provided between the secondary inductor 30 and the secondary variable capacitor 29. The distance measurement high-frequency power source 23 is connected between the switch SW2 and the secondary inductor 30 and supplies power to the secondary matching unit 22A. Accordingly, the secondary matching unit 22A supplies power from the power supply facility 10 to the charger 25 of the mobile facility 20 by the high frequency power source 11, and the primary side resonance coil 13b and the secondary side resonance coil 21b by the distance measurement high frequency power source 23. Functions in both directions when detecting the distance between the two. In the present embodiment, it is not necessary to disconnect the distance measurement high-frequency power source 23 from the secondary matching unit 22A with a switch, for example, when power is supplied from the power supply facility 10 to the mobile facility 20.

  FIG. 5 illustrates a third embodiment. The configuration of the secondary matching unit 22B of this embodiment is different from the secondary matching unit 22A of both the embodiments. The configuration of the resonance type non-contact power feeding system other than the secondary matching unit 22B is configured in the same manner as in the second embodiment. As shown in FIG. 5, the secondary matching unit 22B is composed of two secondary variable capacitors 28 and 29 and two secondary inductors 32 connected in series. One secondary variable capacitor 28 is connected to the secondary coil 21 a, and the other secondary variable capacitor 29 is connected to the rectifier 24. One end of the secondary inductor 32 is connected to the secondary coil 21 a and the secondary variable capacitor 28. The other secondary inductor 32 is connected to the rectifier 24 and the secondary variable capacitor 29. The output terminal of the distance measurement high-frequency power source 23 is connected to the junction point between the two secondary inductors 32. In FIG. 5, the voltage sensor 31 is not shown.

  When the vehicle controller 27 detects the distance between the primary resonance coil 13b and the secondary resonance coil 21b, the vehicle controller 27 outputs AC power from the distance measurement high-frequency power source 23 with the charger 25 in a high impedance state. To do. Specifically, for example, the vehicle controller 27 outputs a command signal to the charger 25 so as to keep the switching element of the DC / DC converter provided in the charger 25 in an off state, and sets the distance measuring high-frequency power source 23. Turn on. When the distance measuring high-frequency power source 23 outputs AC power while the charger 25 is in a high impedance state, AC power from the distance measuring high-frequency power source 23 is not supplied to the charger 25 but to the secondary resonance coil 21b. Supplied. The detection signal of the voltage sensor 31 is input to the vehicle controller 27 in that state. And the vehicle controller 27 calculates the input impedance of a resonance system from the detection signal of the voltage sensor 31, and detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b from the calculation result.

  When the vehicle controller 27 does not detect the distance, the vehicle controller 27 adjusts the secondary matching unit 22B or stops the switching element of the DC / DC converter of the charger 25 while the output of the AC power from the distance measurement high-frequency power supply 23 is stopped. To control.

According to the third embodiment, in addition to the same advantages as (2) to (4) of the first embodiment, the following advantages are obtained.
(6) The secondary matching unit 22B is a π type. When the vehicle controller 27 detects the distance between the primary resonance coil 13b and the secondary resonance coil 21b, the vehicle controller 27 instructs the charger 25 to keep the charger 25 in a high impedance state. Therefore, when the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b is detected, the power supplied from the distance measurement high frequency power supply 23 to the secondary matching unit 22B is supplied to the charger 25. Without being supplied to the secondary resonance coil 21b. As described above, in this embodiment, the charger 25 (charger 25 side) is set to high impedance without newly providing a switch such as a relay, so that the output power of the distance measurement high-frequency power source 23 is supplied to the charger 25. A state in which the secondary resonance coil 21b is supplied without being supplied can be handled.

  FIG. 6 illustrates a fourth embodiment. The configuration of the power supply facility 10 of this embodiment is different from that of the first embodiment. On the other hand, the mobile facility 20 is configured in the same manner as in the first embodiment. The same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 6, the power supply facility 10 is provided with a termination resistor 18. The termination resistor 18 is provided so as to be connectable to the resonance system via the switch SW3. The switch SW3 is configured to selectively connect the primary matching unit 12 to either the high-frequency power source 11 or the termination resistor 18 according to a command from the power supply controller 14. The switch SW3 is switched to a state in which the primary matching unit 12 is connected to the termination resistor 18 when the mobile facility 20 detects the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b. On the other hand, when the high frequency power supply 11 supplies power to the mobile equipment 20, the switch SW3 is switched to a state in which the primary matching unit 12 is connected to the high frequency power supply 11. That is, the resonance system is disconnected from the high-frequency power supply 11 and connected to the termination resistor 18 when the mobile equipment 20 detects the distance between the primary-side resonance coil 13b and the secondary-side resonance coil 21b. The switch SW3 is configured by a relay contact c, for example. Although FIG. 6 illustrates the contact c of the relay as a contact type, the present invention is not limited to this, and the switch SW3 may be configured by a non-contact relay using a semiconductor element.

  When the power supply controller 14 receives the power supply request signal transmitted from the vehicle controller 27, the power supply controller 14 performs power supply after switching the switch SW3 so that the primary matching unit 12 is connected to the high frequency power supply 11.

The fourth embodiment has the following effects in addition to the same effects as (1) to (4) of the first embodiment.
(7) The power supply facility 10 is provided with a termination resistor 18 that can be connected to the resonance system via the switch SW3. When the distance is detected by the mobile facility 20, the resonance system is disconnected from the AC power supply (high-frequency power supply 11) by the switch SW3 and connected to the termination resistor 18. Here, even if the resonance system is connected to the high-frequency power source 11 at the time of detecting the distance, the mobile facility 20 may be connected to the primary-side resonance coil 13b if power is not supplied from the high-frequency power source 11 to the resonance system. It is possible to detect the distance between the secondary resonance coil 21b and the secondary resonance coil 21b. However, in this case, since the high frequency power supply 11 has some influence on the impedance of the resonance system, the detection accuracy of the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b is lowered. Therefore, in this embodiment, the resonance system is disconnected from the high-frequency power supply 11 by the switch SW3 and is connected to the termination resistor 18 when detecting the distance. For this reason, in this embodiment, since the influence of the high frequency power supply 11 on the impedance of the resonance system is eliminated during distance detection, the distance detection accuracy between the primary resonance coil 13b and the secondary resonance coil 21b is increased.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The resonance-type non-contact power feeding system is not limited to performing distance detection based on data indicating the relationship between the distance between the primary resonance coil 13b and the secondary resonance coil 21b and the input impedance of the resonance system. For example, the resonance-type non-contact power feeding system performs distance detection based on data indicating the relationship between the distance between the primary resonance coil 13b and the secondary resonance coil 21b and the output voltage of the primary coil 13a. It may be. In this case, a voltage sensor that detects the output voltage of the primary coil 13 a is provided in the power supply facility 10. The vehicle controller 27 detects (calculates) the distance between the primary resonance coil 13b and the secondary resonance coil 21b by receiving the detection result of the voltage sensor of the power supply facility 10 from the power supply controller 14 by wireless communication. )

In order for the resonance-type non-contact power supply system to perform non-contact power supply between the power supply facility 10 and the mobile facility 20, the resonance system includes a primary coil 13a, a primary-side resonance coil 13b, a secondary coil 21a, and Not all of the secondary side resonance coil 21b is essential. That is, the resonance system only needs to include at least the primary resonance coil 13b and the secondary resonance coil 21b. For example, instead of configuring the primary coil device 13 with the primary coil 13a and the primary resonance coil 13b, for example, the primary coil 13a is deleted. In this case, the primary side resonance coil 13 b is connected to the high frequency power supply 11 through the primary matching unit 12. Alternatively, instead of configuring the secondary coil device 21 with the secondary coil 21a and the secondary resonance coil 21b, for example, the secondary coil 21a is deleted. In this case, the secondary resonance coil 21b is connected to the rectifier 24 via the secondary matching device 22 or the like. However, the resonance system including all of the primary coil 13a, the primary side resonance coil 13b, the secondary coil 21a, and the secondary side resonance coil 21b is easier to adjust to the resonance state. Further, even when the distance between the primary side resonance coil 13b and the secondary side resonance coil 21b is increased, all of the primary coil 13a, the primary side resonance coil 13b, the secondary coil 21a, and the secondary side resonance coil 21b are used. The resonance system having the configuration is more easily maintained in the resonance state.

  When the secondary coil 21a is eliminated, the voltage sensor 31 constituting the distance estimating unit measures the voltage between both ends of the secondary resonance coil 21b. For example, when the power supply facility 10 estimates the distance between the primary resonance coil 13b and the secondary resonance coil 21b based on the detected voltage value, instead of detecting the output voltage of the secondary coil 21a, The voltage of the secondary resonance coil 21b is detected. The vehicle controller 27 calculates the relationship between the primary resonance coil 13b and the secondary side from the map or the relational expression indicating the relationship between the distance between the primary resonance coil 13b and the secondary resonance coil 21b and the voltage values thereof. The distance to the resonance coil 21b is detected.

  In the case where the distance measurement high-frequency power source 23 can be switched between the state connected to the secondary matching unit 22 and the state connected to the rectifier 24 via the switch SW1 as in the first embodiment, the secondary matching The device 22 is not limited to the π-type, and may be a T-type or L-type matching device.

The primary matching unit 12 provided in the power supply facility 10 is not limited to the π type, and may be a T type or L type matching unit.
The primary matching device 12 and the secondary matching devices 22, 22A, 22B are not limited to the configuration provided with two variable capacitors and an inductor, respectively. The primary matching device 12 and the secondary matching devices 22, 22 </ b> A, and 22 </ b> B may be configured by a configuration including a variable inductor as an inductor or a configuration including a variable inductor and two non-variable capacitors.

  The primary matching unit 12 may be omitted from the power supply facility 10. However, when the primary matching unit 12 is omitted, in order to efficiently supply power from the power supply side to the power receiving side, it takes time to adjust the frequency of the AC power output from the high frequency power supply 11.

  The termination resistor 18 of the fourth embodiment is not limited to being provided in the power supply facility 10 of the first embodiment, and may be provided in the power supply facility 10 in the second embodiment, the third embodiment, or other embodiments. The termination resistor 18 is configured to be able to selectively connect the primary matching unit 12 to either the high-frequency power source 11 or the termination resistor 18 via the switch SW3. When the mobile equipment 20 detects the distance between the primary resonance coil 13b and the secondary resonance coil 21b, the switch SW3 disconnects the resonance system from the high frequency power supply 11 and connects it to the termination resistor 18.

  The axial center of the primary coil 13a, the primary side resonance coil 13b, the secondary side resonance coil 21b, and the secondary coil 21a is not limited to the configuration provided to extend in the horizontal direction or the vertical direction. The structure provided so that it may extend diagonally may be sufficient.

The vehicle as the moving body is not limited to a vehicle that requires a driver, and may be an automatic guided vehicle.
The moving body is not limited to a vehicle but may be a robot.
The charger 25 may not be provided with a booster circuit. For example, the charger 25 may charge the secondary battery 26 only when the alternating current output from the secondary coil device 21 is rectified by the rectifier 24.

  The charger 25 may be omitted from the mobile facility 20. In this case, the electric power rectified by the rectifier 24 is supplied to the secondary battery 26 as it is. In addition, the power supply facility 10 is not limited to the presence or absence of the charger 25, and may be configured to adjust the output power of the high-frequency power source 11.

  The diameters of the primary coil 13a and the secondary coil 21a are not limited to the configuration formed to be the same as the diameters of the primary resonance coil 13b and the secondary resonance coil 21b, and may be smaller or larger.

The primary-side resonance coil 13b and the secondary-side resonance coil 21b are not limited to the shape in which the electric wire is wound spirally, but may have a shape wound spirally on a single plane.
The capacitors C connected to the primary resonance coil 13b and the secondary resonance coil 21b may be omitted. However, the configuration in which the capacitor C is connected to the primary resonance coil 13b and the secondary resonance coil 21b can lower the resonance frequency compared to the case where the capacitor C is omitted. If the resonance frequency is the same, the configuration in which the capacitor C is connected to the primary resonance coil 13b and the secondary resonance coil 21b, respectively, compared to the case where the capacitor C is omitted, is the primary resonance coil 13b. And the secondary resonance coil 21b can be downsized.

Claims (7)

A resonance-type non-contact power feeding system including a power feeding facility and a moving body facility,
The power supply facility includes an AC power source and a primary resonance coil that receives power from the AC power source,
The mobile facility is supplied with a secondary resonance coil that receives power from the primary resonance coil, a rectifier that rectifies the power received by the secondary resonance coil, and power rectified by the rectifier A rechargeable battery,
The resonance-type non-contact power feeding system is characterized by the following:
The mobile equipment further includes a secondary matching unit and a distance measuring high-frequency power source between the secondary side resonance coil and the rectifier,
When the distance between the primary side resonance coil and the secondary side resonance coil is detected, the output of the distance measurement high frequency power supply is supplied to the secondary side resonance coil via the secondary matching unit. Configured to
When the power supply facility supplies power, the distance measuring high-frequency power supply is stopped, and the power supplied by the power supply facility is supplied to the secondary battery via the secondary matching device and the rectifier. Configured to,
Resonant contactless power supply system. The secondary matching unit is π-type,
The distance measuring high-frequency power supply supplies power to the secondary matching unit.
The resonance-type non-contact power feeding system according to claim 1 . The resonant non-contact power feeding system further includes:
A control device for setting the impedance of the input terminal of the rectifier to a high impedance when a distance between the primary resonance coil and the secondary resonance coil is detected;
The resonance-type non-contact power feeding system according to claim 2 . The resonance-type non-contact power feeding system has a resonance system,
The mobile equipment is
An input impedance measuring unit for measuring an input impedance of the resonance system in a state where AC power is output from the distance measuring high-frequency power source;
Based on the relationship between the distance between the primary resonance coil and the secondary resonance coil and the input impedance of the resonance system, the distance between the primary resonance coil and the secondary resonance coil is calculated. A distance calculation unit,
The resonance-type non-contact electric power feeding system according to any one of claims 1 to 3 . The secondary matching device is a π-type matching device including two variable capacitors and an inductor provided between the two variable capacitors.
The resonance-type non-contact electric power feeding system according to any one of claims 1 to 4 . The moving body is a vehicle.
The resonance-type non-contact electric power feeding system according to any one of claims 1 to 4 . The mobile facility further includes a charger provided between the rectifier and the secondary battery,
The power rectified by the rectifier is supplied to the charger,
The secondary battery is connected to the charger.
The resonance type non-contact electric power feeding system according to any one of claims 1 to 6 .

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