JP6555848B2 - Charged device, its control method, control program, and non-contact charging system - Google Patents

Description

  The present invention relates to a device to be charged, and more particularly to a method for shortening a charging time when charging a device to be charged by non-contact charging.

  Conventionally, contactless charging systems using electromagnetic induction or magnetic resonance are known. In a non-contact charging system using electromagnetic induction, a coil provided on a charging unit (that is, a contacted charging device) side is used as a primary coil, and a voltage applied to the primary coil is excited. Then, the secondary coil magnetic flux is changed using the coil on the charged device side as a secondary coil. The device to be charged is charged using the electromotive force generated in the secondary coil due to the change of the magnetic flux.

  Even when charging is performed in a non-contact charging system using magnetic resonance, as described above, a primary coil is provided on the charging unit side, a secondary coil is provided on the charged device side, and the frequency is set in advance. Recharge and recharge the device to be charged. And the non-contact charge system using magnetic resonance can charge even if the distance with a to-be-charged apparatus is separated compared with the non-contact charge system using electromagnetic induction.

  By the way, in these non-contact charge systems, it is necessary to check the charge amount of the rechargeable battery provided in the device to be charged, and stop charging when the charge amount becomes sufficient.

  In order to stop the charging of the device to be charged, for example, the device to be charged is provided with means for detecting the remaining amount of the rechargeable battery so that the remaining amount in the device to be charged and the determination of the charge stop are performed. There is a charging system (see Patent Document 1).

JP-A-6-339232

  However, in the above-mentioned Patent Document 1, since the remaining amount of the rechargeable battery is detected in the device to be charged, electric power is consumed in the device to be charged for the processing related to the remaining amount detection. The power for charging the battery will be reduced.

  In a non-contact charging system, it is necessary to use limited charging energy effectively. In addition, it is possible to take into account that the power receiving efficiency of charging energy decreases due to the positional relationship between the non-contact charging device and the device to be charged. It is desirable to reduce processing other than charging in the device to be charged as far as possible.

  Then, this invention aims at shortening the charge time concerning the non-contact charge to a to-be-charged apparatus by reducing the power consumption by processes other than charge in a to-be-charged apparatus.

In order to achieve the above object, a device to be charged according to the present invention includes a rechargeable battery, and the rechargeable battery is charged by a charging device in a contactless manner, and the power sent from the charging device is received. Power supply means for directly charging the rechargeable battery by supplying to the rechargeable battery, detection means for detecting the amount of charge in the rechargeable battery that operates by being supplied with electric power sent from the charging device, and the detection means first the Ru der below threshold set charge amount detected in advance by the start of the charging to the rechargeable battery oN control to said power supply means, said detecting means and off control, the charging It possesses a control means for performing charge amount detection request for requesting detection of the rechargeable battery to the apparatus, wherein the control means, the charge amount of the rechargeable battery from the charging device based on the charge amount detection request the first The third greater than the threshold of 1 Upon receiving the battery status notification indicating that the threshold is exceeded, as well as on control said detection means, characterized in that the charge control the rechargeable battery to the power supply unit turns off controlled at a constant current.

  ADVANTAGE OF THE INVENTION According to this invention, the charge time concerning the non-contact charge to a to-be-charged apparatus can be shortened by reducing the power consumption by processes other than charge in a to-be-charged apparatus.

1 is a perspective view schematically showing an appearance of an example of a contactless charging system according to an embodiment of the present invention. It is a block diagram which shows the example about the structure of the charger shown in FIG. 1, and a to-be-charged apparatus. It is a flowchart for demonstrating operation | movement of a to-be-charged apparatus in the non-contact charge system shown in FIG. It is a figure which shows the relationship between the 1st threshold value and 2nd threshold value which are used with the non-contact charge system shown in FIG. 2, and charge amount. It is a flowchart for demonstrating operation | movement of a non-contact charger in the non-contact charge system shown in FIG. It is a flowchart for demonstrating operation | movement of a to-be-charged apparatus in the non-contact charge system by the 2nd Embodiment of this invention. It is a figure which shows the relationship between the 1st-3rd threshold value and charge amount which are used with the non-contact charge system by the 2nd Embodiment of this invention.

  Hereinafter, an example of a non-contact charging system according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view schematically showing an appearance of an example of a contactless charging system according to an embodiment of the present invention.

  The illustrated non-contact charging system includes a non-contact charging device (hereinafter referred to as a charger) 100 and a device to be charged 200. In the illustrated example, the device to be charged 200 is, for example, an imaging device such as a digital camera. Here, the device to be charged 200 is charged from the charger 100 in a non-contact state.

  FIG. 2 is a block diagram showing an example of the configuration of the charger 100 and the device to be charged 200 shown in FIG.

  The illustrated charger 100 includes a power transmission coil 101 (that is, a primary coil), a rectification unit 103, a DC / DC converter 104, a charge control unit 105, a power transmission coil excitation unit 106, a charging operation unit 107, a display unit 108, and a coil load. It has a detection unit 109 and a charger communication unit 110. The rectifying unit 103 is connected to the commercial power source 102.

  Charged device 200 includes a power receiving coil 201 (that is, a secondary coil), a resonance / rectification unit 202, a power reception control unit 203, a charged device communication unit 204, changeover switches 205 and 206, and a rechargeable battery 207.

  The AC voltage of the commercial power source 102 is rectified and smoothed by the rectifier 103 and converted into a DC voltage. This DC voltage is supplied to the DC / DC converter 104. The DC / DC converter 104 converts a direct current voltage into a voltage of a predetermined level (referred to as a predetermined voltage) and applies it to the charge control unit 105.

  The charging control unit 105 is a control unit including a microcomputer and a memory, and determines whether or not to output a predetermined voltage from the DC / DC converter to the power transmission coil excitation unit 106. When outputting the predetermined voltage, the charging control unit 105 turns on (ON control) a switch (not shown) for controlling the power transmission coil excitation unit 106 and outputs the predetermined voltage.

  The power transmission coil excitation unit 106 receives a predetermined voltage from the DC / DC converter 104 via the charging control unit 105, and excites the power transmission coil 101 with this predetermined voltage. As a result, electromagnetic waves are transmitted from the power transmission coil 101 to the device 200 to be charged. That is, electric power is transmitted from the power transmission coil 101 to the charged device 200 in a non-contact manner.

  The charging operation unit 107 is for operating the charger 100 such as an output of the charger 100 and an operation of a display unit (for example, LCD panel) 108. The display unit 108 displays an instruction to the user such as when instructing the user to move the charged device 200.

  The coil load detection unit 109 detects the load of the rechargeable battery 207 via the coils 101 and 201 and measures the charge amount of the rechargeable battery 207. The charge amount of the rechargeable battery 207 may be rephrased as the remaining amount of the rechargeable battery 207. The charger communication unit 110 communicates with the charged device 200 via the coils 101 and 201 under the control of the charge control unit 105. During communication, the charger communication unit 110 excites the coil 101 at a frequency different from the frequency used for non-contact charging, and communicates with the device to be charged 200 by superimposing communication information on the excitation signal.

  Note that the charger communication unit 110 receives not only transmission but also communication information from the device to be charged 204 via the coils 201 and 101 as a receiving side.

  In the device to be charged 200, an electromotive force corresponding to the electromagnetic wave received by the coil 201 is generated. The coil 201 is connected to a resonance / rectification unit 202, and the resonance / rectification unit 202 generates an electromotive force only in response to an electromagnetic wave having a predetermined specific frequency. Then, the resonance / regulation flow unit 202 rectifies and smoothes the electromotive force and outputs the smoothed power.

The smoothed power is supplied directly to the rechargeable battery 207 or supplied to the rechargeable battery 207 via the power reception control unit 203 depending on the state of the changeover switches 205 and 206.

  The power reception control unit 203 is connected to the rechargeable battery 207, measures the amount of charge of the rechargeable battery 207, controls the smoothed power that is the output of the resonance / rectifier unit 202, and supplies it to the rechargeable battery 207. Charged device communication unit 204 can communicate with charger 100 via coils 201 and 101. The to-be-charged device communication unit 204 detects only an excitation signal with a specific communication frequency, analyzes the excitation signal, and obtains communication information superimposed on the excitation signal.

  In addition, the to-be-charged device communication unit 204 can excite the coil 201 and send communication information to the charger 100.

  The changeover switches 205 and 206 are controlled by the charged device communication unit 204. That is, the to-be-charged device communication unit 204 controls the changeover switches 205 and 206 according to the communication information sent from the charger 100. Here, the to-be-charged device communication unit 204 switches whether the rechargeable battery 207 is directly charged by the output of the resonance / rectification unit 202 or is charged via the power reception control unit 203. The rechargeable battery 207 is a secondary battery such as a lithium ion battery or a lithium hydrogen battery.

  FIG. 3 is a flowchart for explaining the operation of the device to be charged in the non-contact charging system shown in FIG. Note that the processing according to the illustrated flowchart is performed under the control of the power reception control unit 203.

  Here, it is assumed that charger 100 has already started power transmission. That is, it is assumed that the charger 100 has already transmitted charging electromagnetic waves (radio waves). This state is referred to as the charger 100 being in a steady state.

  When the charger 100 is in a steady state, the device to be charged 200 is placed on or brought close to the charger 100 (step S301). At this time, in the to-be-charged device 200, the changeover switch 205 is on and the changeover switch 206 is off. As a result, the to-be-charged device 200 receives power through the coil 201, and power (smoothed power) is supplied to the power reception control unit 203 through the changeover switch 205.

  As a result, the power reception control unit 203 operates, and the power reception control unit 203 detects the amount of charge of the rechargeable battery 207 (step S302). Based on the detection result of the charge amount, the power reception control unit 203 determines whether or not the charge amount of the rechargeable battery 207 is less than a preset first threshold value (threshold value 1) (step S303).

If the charge amount is greater than or equal to threshold value 1 (NO in step S303), power reception control unit 203 returns to the process in step S302 and continues to detect the charge amount. On the other hand, if the amount of charge is less than threshold value 1 (YES in step S303), power reception control unit 203 performs charging for requesting charger 100 to detect the amount of charge of rechargeable battery 207 by means of charged device communication unit 204. An amount detection request is made (step S304).

  After the process of step S304, under the control of the power reception control unit 203, the to-be-charged device communication unit 204 turns off the changeover switch 205 (controls off) and turns on the changeover switch 206 (step S305). That is, the power reception control unit 203 is turned off, and the smoothed power is sent from the resonance / rectification unit 202 to the rechargeable battery 207 via the changeover switch 206 to charge the rechargeable battery 207.

  Subsequently, whether or not the to-be-charged device communication unit 204 has received a notification from the charger 100 that the amount of charge exceeds a predetermined second threshold (threshold 2) (hereinafter referred to as a second superthreshold notification). Is determined (step S306). Note that the second super-threshold notification is a rechargeable battery state notification indicating the charging state of the rechargeable battery 207, for example, a completion notification indicating completion of charging of the rechargeable battery 207.

  FIG. 4 is a diagram showing a relationship between the first threshold value and the second threshold value used in the non-contact charging system shown in FIG. 2 and the charge amount.

  As shown in FIG. 4, the first threshold value (threshold value 1) is set higher than the charge amount at the start of charging, and the second threshold value (threshold value 2) is set to the charge amount at the end of charging. Is done. Then, threshold 2> threshold 1.

  If the second threshold value super notification is not received (NO in step S306), charged device communication unit 204 continues the process of step S306. On the other hand, when the second threshold value super notification is received (YES in step S306), the to-be-charged device communication unit 204 turns off the changeover switch 206 and turns on the changeover switch 205 to operate the power reception control unit 203 (on). ) To finish the power reception (step S307). Thereafter, the process returns to step S303, and the power reception control unit 203 detects the charge amount of the rechargeable battery 207 without charging the rechargeable battery 207.

  In this way, the device to be charged 200 performs the processes of steps S302 and S303 unless removed from the charger 100. Then, when the charge amount of the rechargeable battery 207 becomes less than the threshold value 1 due to natural discharge or other reasons, the processing in step S304 and subsequent steps is performed.

  FIG. 5 is a flowchart for explaining the operation of the non-contact charger in the non-contact charging system shown in FIG. The process according to the illustrated flowchart is performed under the control of the charging control unit 105.

  As described in step S304 of FIG. 3, when the charge amount is less than the threshold value 1, the power reception control unit 203 makes a charge amount detection request to the charger 100 by the charged device communication unit 204 (step S304). In the charger 100, the charger communication unit 110 monitors whether or not a charge amount detection request has been received from the device to be charged 200 under the control of the charge control unit 105 (step S501).

  If no charge amount detection request is received from device to be charged 200 (NO in step S501), charger communication unit 110 continues the process of step S501. On the other hand, when a charge amount detection request is received from device to be charged 200 (YES in step S501), charger communication unit 110 notifies charge control unit 105 to that effect. Thereby, the charging control unit 105 detects the load of the rechargeable battery 207 via the coils 101 and 201 by the coil load detecting unit 109, and measures the charge amount of the rechargeable battery 207 (step S502).

  Subsequently, the charge control unit 105 determines whether or not the amount of charge detected by the coil load detection unit 109 exceeds the above-described second threshold (threshold 2) (step S503). If the amount of charge detected by coil load detection unit 109 is equal to or less than threshold value 2 (NO in step S503), charge control unit 105 returns to the process in step S502 and charges rechargeable battery 207 by coil load detection unit 109. Detect the amount.

  On the other hand, when the charge amount detected by coil load detection unit 109 exceeds threshold value 2 (YES in step S503), charge control unit 105 notifies charger unit communication unit 110 that the second threshold value is exceeded (that is, charge amount> Notification to the effect that the threshold value is 2) is sent to the charged device 200 (step S504). Then, the charging control unit 105 returns to the process of step S501.

  As described above, in the first embodiment of the present invention, when the charge amount of the rechargeable battery 207 becomes less than the first threshold, a charge amount detection request is made to the charger 100 and the power reception control unit 203 is turned off. Then, when the rechargeable battery 207 is charged and the charger 100 notifies that the amount of charge exceeds the second threshold, the power reception control unit 203 is turned on and the charging is terminated. As a result, it is possible to reduce the power consumed by the power reception control unit 203 when charging the device to be charged 200. As a result, a large amount of power can be supplied to the rechargeable battery 207 to shorten the charging time.

[Second Embodiment]
Next, an example of a non-contact charging system according to the second embodiment of the present invention will be described.

  The configuration of the contactless charging system according to the second embodiment is the same as that of the contactless charging system shown in FIG.

  FIG. 6 is a flowchart for explaining the operation of the device to be charged in the non-contact charging system according to the second embodiment of the present invention.

  Note that the processing according to the illustrated flowchart is performed under the control of the power reception control unit 203. In FIG. 6, the same steps as those in the flowchart shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  As described with reference to FIG. 3, if the charge amount <threshold value 1, a charge amount detection request is made from the charged device 200 to the charger 100 in step S <b> 304, and the power reception control unit 203 in step S <b> 305. It is turned off and charging of the rechargeable battery 207 is started. Then, in response to the charge amount detection notification, the charger 100 measures the charge amount of the rechargeable battery 207 as described in FIG.

Although not shown, in the second embodiment, the charger 100 uses a third threshold value (threshold value 3) instead of the second threshold value (threshold value 2 ) when measuring the charge amount of the rechargeable battery 207. Thus, when the charge amount> threshold value 3, a notification indicating that the charge amount> threshold value 3 is satisfied (third threshold value super notification) is sent to the device 200 to be charged.

  FIG. 7 is a diagram showing the relationship between the first to third threshold values and the charge amount used in the non-contact charging system according to the second embodiment of the present invention.

  As shown in FIG. 7, the third threshold value (threshold value 3) is set to a charge amount for starting precise charging, that is, constant current charging, and threshold value 2> threshold value 3> threshold value 1.

  In the to-be-charged device 200, the to-be-charged device communication unit 204 monitors whether or not it has received a third super-threshold notification (a notification indicating that the charge amount> threshold 3 has been reached) (step S601). If no third threshold notification is received from charger 100 (NO in step S601), charged device communication unit 204 continues the process of step S601.

  On the other hand, when the device-to-be-charged communication unit 204 receives the third threshold value super notification from the charger 100 (NO in step S601), the device-to-be-charged communication unit 204 turns on the changeover switch 205 and sets the changeover switch 206. The power reception control unit 203 is operated as being off. Accordingly, the power reception control unit 203 starts a charge amount detection operation for detecting the charge amount of the rechargeable battery 207 and a constant current charge operation for charging the rechargeable battery 207 with a constant current (step S602).

  The power reception control unit 203 detects the amount of charge of the rechargeable battery 207 (step S603), and determines whether or not the amount of charge exceeds the second threshold (threshold 2) (step S604). If the charge amount is equal to or less than threshold value 2 (NO in step S604), power reception control unit 203 returns to the process in step S604 and continues measuring the charge amount of rechargeable battery 207.

  When the charge amount exceeds threshold value 2 (YES in step S604), power reception control unit 203 ends the constant current charging operation (step S605). Then, the power reception control unit 203 returns to the process of step S302.

  As described above, in the second embodiment of the present invention, when the charge amount of the rechargeable battery 207 exceeds the third threshold value, the charge amount constant current charging is performed while the charge amount is monitored in the device 200 to be charged. Thus, the charging of the rechargeable battery 207 can be optimally controlled.

  Furthermore, in the second embodiment, since the power reception control unit 203 is turned off until the charge amount exceeds the third threshold value, the power consumed by the power reception control unit 203 can be reduced. Electric power can be supplied to shorten the charging time.

  In the first and second embodiments described above, when the charger 100 and the device to be charged 200 communicate with each other, the coils 101 and 201 are used for communication. May be used.

  Furthermore, in the first and second embodiments, the operation of the power reception control unit 203 is always stopped for a charging operation or a part of the charging operation to reduce power. When the intensity of the radio wave transmitted to 200 is sufficient, the operation of the power reception control unit 203 may not be stopped. For example, the device 200 to be charged first determines whether or not the radio field intensity exceeds a predetermined radio field intensity threshold. When the radio field intensity exceeds the radio field intensity threshold, charging is performed without stopping the operation of the power reception control unit 203. May be performed.

  In the first and second embodiments, the charge amount of the rechargeable battery 207 is detected by the power reception control unit 203 and charging is started according to the detection result. You may make it perform by another means.

  In addition, in the second embodiment, constant current charging is performed when the amount of charge exceeds the third threshold, but constant voltage charging may be performed, for example.

  In the first and second embodiments, an imaging device such as a digital camera is used as an example of a device to be charged. However, the charging device is not limited to the imaging device and is charged from the charging device in a contactless manner. Any electronic device can be similarly applied.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. .

  For example, the function of the above embodiment may be used as a control method, and this control method may be executed by the device to be charged. Moreover, you may make it make the computer with which a to-be-charged apparatus is provided perform the said control program by using the program which has the function of the above-mentioned embodiment as a control program. The control program is recorded on a computer-readable recording medium, for example.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various recording media, and the computer (or CPU, MPU, etc.) of the system or apparatus reads the program. To be executed.

100 Non-contact charger (non-contact charger)
DESCRIPTION OF SYMBOLS 105 Charge control part 106 Power transmission coil excitation part 109 Coil load detection part 110 Charger communication part 200 Charged device 203 Power reception control part 204 Charger communication part 205,206 Changeover switch 207 Rechargeable battery

Claims (11)

A rechargeable battery comprising a rechargeable battery, wherein the rechargeable battery is charged by a charging device in a non-contact manner,
Power supply means for supplying the power sent from the charging device to the rechargeable battery and directly charging the rechargeable battery;
A detector that operates by being supplied with power sent from the charging device and detects a charge amount in the rechargeable battery;
When the amount of charge detected by the detection means is less than a preset first threshold, the power supply means is turned on to start charging the rechargeable battery, the detection means is turned off, Control means for performing a charge amount detection request for requesting the charging device to detect the rechargeable battery,
When the control means receives a rechargeable battery state notification indicating that the charge amount of the rechargeable battery has exceeded a third threshold value greater than the first threshold value from the charging device based on the charge amount detection request, An apparatus to be charged, wherein the detection unit is turned on and the power supply unit is turned off to charge the rechargeable battery with a constant current. When the charging device receives the charge amount detection request, the charging unit measures the charge amount of the rechargeable battery in a non-contact manner,
2. The device to be charged according to claim 1, further comprising: a transmission unit that sends the rechargeable battery state notification to the device to be charged when the amount of charge measured by the measuring unit exceeds the third threshold. .   The transmission means sends a completion notification indicating completion of charging of the rechargeable battery to the device to be charged when the amount of charge measured by the measurement means reaches a second threshold value that is greater than the third threshold value. The charged device according to claim 2, further comprising: means.   The device to be charged according to claim 3, wherein upon receipt of the completion notification, the control unit ends charging of the rechargeable battery. Furthermore, the electric power sent from the charging device is supplied to operate, and includes a power receiving means for charging the rechargeable battery,
It said control means receives said rechargeable battery status notification, claim 3, characterized in that the charging by the power supply means is operated said receiving means to stop charging of the rechargeable battery by the power receiving means Or the to-be-charged apparatus of 4 .   The device to be charged according to claim 5, wherein the control unit performs constant current charging in which the rechargeable battery is charged with a constant current by the power receiving unit.   The said to-be-charged apparatus is a to-be-charged apparatus of Claim 6 which performs the constant voltage charge which charges the said rechargeable battery by a constant voltage instead of the said constant current charge by the said power receiving means.   8. The control unit according to claim 5, wherein the control unit terminates the charging by the power receiving unit when the amount of charge detected by the detection unit exceeds the second threshold value. 9. Charged equipment. A method for controlling a device to be charged, comprising: a rechargeable battery that is charged by a charging device in a non-contact manner; and a detection unit that operates by being supplied with power sent from the charging device and detects a charge amount in the rechargeable battery. ,
A power supply step of supplying power sent from the charging device to the rechargeable battery to directly charge the rechargeable battery;
When the amount of charge detected by the detection unit is less than a preset first threshold, charging of the rechargeable battery in the power supply step is started, the detection unit is turned off, and the charging device is And a control step for performing a charge amount detection request for requesting detection of the rechargeable battery,
In the control step, upon receiving a rechargeable battery state notification indicating that the charge amount of the rechargeable battery has exceeded a third threshold value that is greater than the first threshold value, based on the charge amount detection request, A control method characterized by controlling the on-state of the detecting means, and stopping the charging in the power supply step to charge the rechargeable battery with a constant current. A control program used in a to-be-charged device having a rechargeable battery that is charged by a charging device in a non-contact manner, and a detection unit that operates by receiving power supplied from the charging device and detects the amount of charge in the rechargeable battery There,
In the computer provided with the device to be charged,
A power supply step of supplying power sent from the charging device to the rechargeable battery to directly charge the rechargeable battery;
When the amount of charge detected by the detection unit is less than a preset first threshold, charging of the rechargeable battery in the power supply step is started, the detection unit is turned off, and the charging device is Performing a charge amount detection request for requesting detection of the rechargeable battery, and
In the control step, upon receiving a rechargeable battery state notification indicating that the charge amount of the rechargeable battery has exceeded a third threshold value that is greater than the first threshold value, based on the charge amount detection request, A control program for controlling on-detection of the detecting means and stopping charging in the power supply step and charging the rechargeable battery with a constant current. Charged device according to any one of claims 1 to 8,
A contactless charging system comprising: a charging device that supplies power to the device to be charged in a contactless manner.

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