WO2011118376A1

WO2011118376A1 - Contactless power transmission device and contactless charging system

Info

Publication number: WO2011118376A1
Application number: PCT/JP2011/055310
Authority: WO
Inventors: 宇宙松元; 篤井坂; 一敬鈴木; 恭平加田; 圭秀金久保; 洋平長竹; 秀之木原
Original assignee: パナソニック電工株式会社; パナソニック株式会社
Priority date: 2010-03-26
Filing date: 2011-03-08
Publication date: 2011-09-29
Also published as: JP2011205867A

Abstract

A contactless power transmission device (10), which charges a load (BA) via a contactless power receiving device (20) without contact, includes an output controller (14) that controls the AC power output to a first coil (L1) in such a manner that AC power is intermittently output to the first coil when in standy mode. When the contactless power receiving device (20) is detected by a detection unit (14), the output controller (14) transmits a confirmation signal to the contactless power receiving device (20) to confirm whether or not the load (BA) can be charged by outputting the same AC power as when charging to the first coil (L1), and modifying the waveform of said AC power. When a response signal indicating that charging is possible is received from the contactless power receiving device (20), the output controller (14) continues outputting AC power to the first coil (L1), thereby initiating charging.

Description

Contactless power transmission device and contactless charging system

The present invention relates to a non-contact power transmission device that performs non-contact power transmission between devices using electromagnetic induction, and a non-contact charging system having the non-contact power transmission device.

In recent years, such a non-contact power transmission device is widely known as a device capable of charging a secondary battery (battery) built in a portable device such as a mobile phone or a digital camera in a non-contact manner. Such a portable device and a charger (power transmission device) corresponding to the portable device are each provided with a coil for transmitting and receiving electric power for charging, and is carried from the charger by electromagnetic induction between the two coils. The AC power transmitted to the device is converted into DC power by the portable device, so that the secondary battery as the power source of the portable device is charged. However, although the connection terminal for electrically connecting the charger and the portable device can be omitted by such non-contact charging, whether or not the charger and the portable device are always connected and charging is possible. It is necessary to exchange information on whether or not wirelessly (see Patent Document 1, Patent Document 2, and Patent Document 3).

In the conventional technology, the power transmission device outputs a detection signal (wireless signal) for detecting and authenticating the portable device during standby and during authentication. When the power transmission device receives a response signal from the portable device with respect to the detection signal, the power transmission device determines that the portable device is installed and can be charged. Further, during standby and during authentication, the output of wireless signals is made intermittent, for example, so as to suppress the power consumption.

JP-A-6-31658 JP 2001-8450 A JP 2009-189230 A

However, if information is exchanged with radio signals that are output intermittently even during authentication, the amount of information decreases, so it takes time to complete authentication, and the user may not have installed it correctly. There was a possibility of reminiscent. Further, since the output of the detection signal is suppressed, the output of the charging power cannot be maximized immediately after the authentication, and there is a possibility that it takes time for charging.

The present invention has been made by paying attention to such problems existing in the prior art. The object is to provide a non-contact power transmission apparatus and a non-contact charging system that can quickly terminate the connection confirmation between the non-contact power transmission apparatus and the non-contact power reception apparatus and can quickly charge the load.

In order to achieve the above object, according to a first aspect of the present invention, an alternating magnetic flux is generated based on alternating current power, and the alternating magnetic flux is caused to intersect with a secondary coil of the non-contact power receiving device. A primary coil for transmitting the AC power to the non-contact power receiving device via the power supply, and intermittently outputting the AC power to the primary coil in the standby state, while in the charging state than in the standby state. An output control unit for controlling the output of the AC power so as to output high AC power to the primary coil, a measurement unit for measuring a waveform of the AC power generated in the primary coil, and the measurement unit. A detector that detects that the non-contact power receiving device is installed at a chargeable position when the waveform of the measured AC power changes, and the output control unit includes the detection unit that detects the non-contact power receiving device. If detected, A confirmation signal for confirming whether or not the load can be charged is transmitted to the non-contact power receiving device by changing the waveform of the alternating current power by outputting the same alternating current power to the primary coil. When a response signal indicating that charging is possible is received from the non-contact power receiving device, the output of AC power to the primary coil is continued to start charging.

A second aspect of the present invention is a non-contact power transmission device including a primary coil that generates an alternating magnetic flux based on AC power, and a secondary that can be electromagnetically coupled by intersecting with the alternating magnetic flux generated in the primary coil. A non-contact charging system comprising a non-contact power receiving device including a coil and charging a load via the non-contact power receiving device, wherein the non-contact power transmitting device supplies the AC power to the primary coil in a standby state. Is generated intermittently in the primary coil, and an output control unit that controls the output of the AC power to output higher AC power to the primary coil than in the standby state in the charging state. A measurement unit that measures the waveform of the AC power, and a detection unit that detects that the non-contact power receiving device is installed at a chargeable position when the waveform of the AC power measured by the measurement unit changes. Including The non-contact power receiving device includes a response unit capable of responding to a control signal from the non-contact power transmitting device, and the output control unit has the same alternating current as when charging when the detecting unit detects the non-contact power receiving device. By transmitting power to the primary coil and changing the waveform of the AC power, a confirmation signal for confirming whether the load can be charged is transmitted to the non-contact power receiving device as the control signal, When a response signal indicating that charging is possible is received from the response unit, the output of AC power to the primary coil is continued to start charging.

The block diagram which shows a non-contact charge system. The flowchart which shows the flow of the process at the time of charge. (A)-(n) is a schematic diagram which shows the waveform of the electric power which flows into a primary coil, and the waveform of the electric power which flows into a secondary coil.

Hereinafter, embodiments of the non-contact power transmission device and the non-contact charging system according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a contactless charging system 100 including the contactless power transmitting device and the contactless power receiving device of the present embodiment. As shown in FIG. 1, the non-contact charging system 100 is roughly composed of a non-contact power transmission device 10 and a non-contact power reception device 20.

First, the non-contact power transmission apparatus 10 will be described.
The non-contact power transmission device 10 includes a voltage stabilization circuit 11, a power transmission unit 12, a primary coil L1, a voltage detection circuit 13 as a measurement unit, a device detection unit (that is, a power reception device detection unit), and a primary side as an output control unit. A control unit 14 is provided.

The voltage stabilization circuit 11 is a circuit that stabilizes the voltage of the input power input from the external power supply E. A power transmission unit 12 is connected to the voltage stabilization circuit 11. When transmitting power, the power transmission unit 12 generates AC power having a predetermined frequency. Moreover, the power transmission part 12 produces | generates the alternating current power of the frequency according to the signal to transmit at the time of signal transmission, and outputs it to the primary coil L1 connected to the power transmission part 12. FIG. The power transmission unit 12 generates and outputs AC power having the frequency f1 when outputting a signal corresponding to “1”, while the frequency f2 when outputting a signal corresponding to “0”. AC power is generated and output.

The primary coil L1 is configured to generate an alternating magnetic flux having a frequency corresponding to the frequency of the AC voltage when AC power is input. The primary coil (power transmission side coil) L1 is electromagnetically coupled to the secondary coil (power reception side coil) L2 to transmit electric power. The voltage detection circuit 13 is a circuit that detects an induced voltage of the primary coil L1. The voltage detection circuit 13 is connected to the primary side control unit 14, and outputs the detected induced electromotive force (voltage) waveform to the primary side control unit 14.

The primary side control unit 14 is configured mainly by a microcomputer or system LSI having a central processing unit (CPU), a storage device (nonvolatile memory (ROM), volatile memory (RAM), etc.) Various controls such as oscillation control of the power transmission unit 12 are executed based on various data and programs stored in the computer.

That is, the primary side control unit 14 is connected to the power transmission unit 12. Then, when the contactless power transmission device 10 transmits a signal to the contactless power receiving device 20, the primary side control unit 14 notifies the power transmission unit 12 of a signal to be transmitted (or a frequency corresponding to the signal to be transmitted). Thus, AC power having a frequency corresponding to the signal to be transmitted is generated in the power transmission unit 12.

Further, the primary side control unit 14 measures the change in the induced electromotive force of the primary coil received from the voltage detection circuit 13, and performs signal detection, foreign object detection, and the like. For example, when the signal control circuit 23 of the non-contact power receiving apparatus 20 performs a load modulation process for transmitting a signal to the non-contact power transmission apparatus 10, the waveform of the induced electromotive force of the primary coil L1 changes. That is, when the non-contact power receiving apparatus 20 reduces the load to transmit the data “0” signal, the amplitude of the signal waveform of the induced electromotive force of the primary coil L1 decreases, and the signal “1” is transmitted. Therefore, when the load is increased, the amplitude of the signal waveform increases. Therefore, the primary-side control unit 14 can determine the type of signal depending on whether or not the peak voltage of the induced electromotive force exceeds a threshold value. In addition, the primary side control part 14 of this embodiment demodulates the radio | wireless communication signal from the non-contact power receiving apparatus 20, analyzes a demodulated signal, and oscillates the power transmission part 12 based on the analysis result ( Frequency) is also controlled. The ROM stores various thresholds and various parameters necessary for demodulating a wireless communication signal with the non-contact power receiving apparatus 20 described in detail later and analyzing the demodulated signal. ing.

Next, the non-contact power receiving device 20 will be described.
The non-contact power receiving device 20 includes a secondary coil L2 that receives the alternating magnetic flux from the non-contact power transmitting device 10, a power receiving unit 21, a secondary side control unit 22 as a response unit, a signal detection circuit 24, and a signal control circuit. 23.

The power receiving unit 21 includes a rectifier circuit that converts AC power (inductive electromotive force) generated in the secondary coil L2 into DC power when the secondary coil L2 receives the alternating magnetic flux. The rectifier circuit includes a rectifier diode and a smoothing capacitor that smoothes the power rectified by the rectifier diode, and converts the AC power input from the secondary coil L2 into DC power, a so-called half-wave rectifier circuit. It is configured as. The configuration of this rectifier circuit is merely an example of a rectifier circuit that converts AC power into DC power, and is not limited to this configuration. A full-wave rectifier circuit using a diode bridge or other known rectifier circuit is also used. You may have the structure of a rectifier circuit. The signal detection circuit 24 is a circuit that detects the induced electromotive force of the secondary coil L2. The signal detection circuit 24 is connected to the secondary side control unit 22, and outputs the detected induced electromotive force (voltage) waveform to the secondary side control unit 22.

When the signal control circuit 23 transmits a signal from the non-contact power receiving device 20 to the non-contact power transmission device 10, the signal control circuit 23 changes the load applied to the secondary coil L2 according to the signal to be transmitted, thereby inducing the induced electromotive force of the primary coil L1. The load modulation process is performed to change the signal waveform. The signal control circuit 23 is connected to the secondary side control unit 22 and executes load modulation processing based on a control signal from the secondary side control unit 22.

The secondary side control unit 22 is mainly configured by a microcomputer having a central processing unit (CPU) and a storage device (ROM, RAM, etc.), and based on various data and programs stored in the memory, The state of charge of the battery BA included in the non-contact power receiving device 20 is determined and various controls such as charge amount control are executed. In the present embodiment, a signal to the non-contact power transmission apparatus 10 is also generated based on the charge amount of the battery BA. In addition, in the ROM, various information required for charge amount control such as determination of the charge amount of the battery (main load) BA, generation of a signal with the contactless power transmission device 10, and modulation based on the signal Various parameters required for the purpose are stored in advance.

The secondary-side control unit 22 is connected to the positive and negative electrodes of the battery BA, and receives power for driving from the battery BA. The secondary-side control unit 22 receives the voltage between the terminals of the battery BA and the like. The charge amount of the battery BA can be grasped. Moreover, the secondary side control part 22 adjusts the alternating current power input from the power receiving part 21 to a predetermined voltage, produces | generates charging power, and outputs it to battery BA. Moreover, the secondary side control part 22 switches whether to output charging power according to the charge amount of the battery BA. For example, when the secondary-side control unit 22 determines that it is preferable to charge the battery BA because the voltage between the terminals of the battery BA is lower than a preset charge amount determination threshold value, the charging power is supplied to the battery. Supply to BA. On the other hand, when it is determined that it is not necessary to charge the battery BA because the voltage between the terminals of the battery BA is higher than the threshold for determining the charge amount, the secondary control unit 22 does not supply the charging power to the battery BA. .

In addition, the secondary side control unit 22 stops the output of the charging power when transmitting and receiving signals to and from the non-contact power transmission apparatus 10. Further, when the operating voltage is lower than the operable voltage, the secondary side control unit 22 electrically disconnects the connection with the battery BA and prevents the reverse flow of the voltage from the battery BA. Further, the secondary side control unit 22 monitors the frequency of the induced electromotive force of the secondary coil L2, and determines whether the signal from the non-contact power transmission device 10 is data “1” or data “0”. It comes to judge.

Next, control related to charging of the battery BA will be described. First, control on the non-contact power transmission apparatus 10 side will be described with reference to FIGS. 2 and 3. In FIG. 3, the induced electromotive force (V) is on the vertical axis.

When the primary side control unit 14 is in a standby state (when not electromagnetically connected to the non-contact power receiving device 20), the primary side control unit 14 intermittently outputs power every predetermined standby period ( Step S10). Specifically, as shown in FIG. 3A, power is output intermittently, and the power is the power and data at the time of charging power transmission (charging) per unit time. It is smaller than the power when transmitting a signal of “0” or data “1”. In the following, a state in which power is output for each standby period may be referred to as a power save mode.

Then, the non-contact power transmission device 10 outputs power intermittently and executes device installation determination for determining whether or not the non-contact power reception device 20 is installed (step S11). More specifically, when the non-contact power transmission device 10 is in a standby state (power save mode), the non-contact power reception device 20 is installed at a predetermined location, and the primary coil L1 and the secondary coil L2 are electromagnetically coupled. Then, as shown in FIG. 3B, the primary coil L1 is affected by the secondary coil L2, and the power waveform changes. Specifically, it changes so that the peak voltage of the AC power of the primary coil L1 becomes small at the time of power output in the standby state. Therefore, the primary-side control unit 14 determines (affirmative determination) that the non-contact power receiving device 20 is set when the power waveform changes in the standby state in the device installation determination. On the other hand, in the device installation determination, the primary-side control unit 14 determines that the non-contact power receiving device 20 is not set (determination determination) when the predetermined time has elapsed without changing the standby power waveform. It has become.

When the negative determination is made in the device installation determination (step S11), the primary side control unit 14 executes the process of step S10 again after a predetermined time has elapsed, and intermittently outputs power again. On the other hand, when the affirmative determination is made in the device installation determination (step S11), the primary side control unit 14 outputs a charge confirmation signal to the non-contact power receiving device 20 with the power at the time of charging power transmission (step S12). In the present embodiment, at the time of charging power transmission, as shown in FIG. 3C, power is continuously output, and a period during which power is stopped is not set. In addition, when the primary side control unit 14 outputs the charge confirmation signal, the primary side control unit 14 converts (modulates) the charge confirmation signal into a combination of signals “0” or “1”, and as illustrated in FIG. The power transmission unit 12 is controlled to output the converted signals in order. As a result, the waveform of the induced electromotive force of the secondary coil L2 changes according to the output charge confirmation signal, as shown in FIG. 3 (i).

When the secondary side control unit 22 demodulates and analyzes the signal consisting of “0” or “1” detected by the signal detection circuit 24 and determines that the charge confirmation signal has been received, the secondary side control unit 22 performs charging based on the voltage of the battery BA. Determine the amount. Then, when charging is possible (when the voltage of the battery BA is equal to or lower than the threshold value), the secondary side control unit 22 outputs a first response signal corresponding to the charging confirmation signal (step S21). Specifically, as shown in FIG. 3 (j), the secondary side control unit 22 changes the load applied to the secondary coil L2 so that the signal control circuit 23 outputs the first response signal. . That is, the secondary side control unit 22 outputs a control signal to the signal control circuit 23 so as to change the load applied to the secondary coil L2 in order to output the first response signal. Thereby, as shown in FIG.3 (d), the voltage of the induced electromotive force of the primary coil L1 will change. In addition, the secondary side control part 22 complete | finishes a process, without outputting a 1st response signal, when charge is unnecessary.

The primary-side control unit 14 demodulates and analyzes the signal based on the waveform of the induced electromotive force detected by the voltage detection circuit 13 and determines whether or not the first response signal is input (that is, the non-contact power receiving device) (Confirmation of whether or not a signal is returned from 20) (step S13). When the determination result is negative (when charging is not required or when the electromagnetic connection is not established), the primary control unit 14 executes the process of step 10 again after a predetermined time has elapsed.

On the other hand, when the determination result of step S13 is affirmative (when the first response signal is received), the primary side control unit 14 outputs an ID confirmation signal indicating 1D for performing ID authentication (step S14). The process when outputting the ID confirmation signal is the same as the process when outputting the charge confirmation signal. Specifically, when outputting the ID confirmation signal, the primary side control unit 14 converts (modulates) the ID confirmation signal into a combination of the signals “0” or “1”, as shown in FIG. As described above, the power transmission unit 12 is controlled by the control signal so as to sequentially output the converted signals. As a result, the waveform of the induced electromotive force of the secondary coil L2 changes according to the ID confirmation signal as shown in FIG.

When the secondary-side control unit 22 demodulates and analyzes the signal consisting of “0” or “1” detected by the signal detection circuit 24 and determines that the ID confirmation signal has been received, the secondary-side control unit 22 can charge the device (contactless power transmission). It is determined whether the ID of the apparatus 10). If the ID of the device that can be charged (when ID authentication is completed (established)), the secondary control unit 22 outputs a second response signal corresponding to the ID confirmation signal (step S22). . Specifically, the secondary side control unit 22 changes the load applied to the secondary coil L2 so that the signal control circuit 23 outputs the second response signal, as shown in FIG. . Thereby, as shown in FIG.3 (f), the voltage of the induced electromotive force of the primary coil L1 will change. In addition, when ID authentication fails (it is not a chargeable apparatus), the secondary side control part 22 complete | finishes a process, without outputting a 2nd response signal, and the non-contact power transmission apparatus 10 is a standby state (power). Switch to save mode. As a result, the primary side control part 14 outputs electric power intermittently with a standby period.

The primary-side control unit 14 demodulates and analyzes the signal based on the waveform of the induced electromotive force detected by the voltage detection circuit 13 and determines whether or not the second response signal is input (that is, the non-contact power receiving device) (Confirmation of whether or not a signal is returned from 20) (step S15). When this determination result is negative (when ID authentication fails), the primary-side control unit 14 executes the process of step 10 again after a predetermined time has elapsed.

On the other hand, when the determination result of step S15 is affirmative (when the second response signal is received), the primary side control unit 14 maintains the power at the time of charging power transmission (FIG. 3 (g)) and performs charging. Start (step S16). After the second response signal is output, the secondary side control unit 22 controls the voltage of the DC power (FIG. 3 (m)) input via the secondary coil L2 and the power receiving unit 21 to generate charging power. , Supplied to the battery BA. Thereby, the secondary side control part 22 starts charge (step S23).

The secondary side control unit 22 continues to monitor the charge amount of the battery BA after the start of charging, and determines whether or not the charging is completed (step S24). Specifically, the secondary side control unit 22 monitors the voltage of the battery BA and determines whether or not it is equal to or greater than a predetermined threshold value. When the determination result of step S24 is negative (when charging is not completed), the secondary-side control unit 22 executes the process of step S24 again after a predetermined time has elapsed.

On the other hand, when the determination result of step S24 is affirmative (when charging is completed), a charging completion signal indicating that charging is completed is output (step S25). Specifically, as shown in FIG. 3 (n), the secondary side control unit 22 changes the load applied to the secondary coil L2 so that the signal control circuit 23 outputs a charge completion signal. Thereby, as shown in FIG.3 (h), the voltage of the induced electromotive force of the primary coil L1 will change.

On the other hand, after the processing of step S16 (after the start of charging), the primary-side control unit 14 performs device installation determination for determining whether or not the non-contact power receiving device 20 is installed as it is (step). S17). More specifically, when the contactless power transmission device 10 is in a charged state, the electromagnetic coupling between the primary coil L1 and the secondary coil L2 is released when the contactless power reception device 20 is removed from a predetermined location. The waveform of the power of the primary coil L1 that flows during charging changes. Specifically, the peak voltage of the AC power of the primary coil L1 that flows during charging changes so as to increase. Therefore, the primary-side control unit 14 determines that the non-contact power receiving device 20 has been removed (negative determination) when the waveform of the voltage of the primary coil L1 that flows during charging changes in the device installation determination in step S17. It is supposed to be. On the other hand, the primary-side control unit 14 installs the non-contact power receiving device 20 when a certain time has elapsed without changing the waveform of the power of the primary coil L1 flowing during charging in the device installation determination in step S17. It is determined (affirmative determination) that it has been performed.

The primary side control part 14 transfers to the process of step S10, when the apparatus installation determination of step S17 becomes negative. On the other hand, the primary side control part 14 determines whether the charge completion signal was received, when the apparatus installation determination of step S17 is affirmation (step S18). The processing in step S18 will be described in detail. The primary side control unit 14 demodulates and analyzes the signal based on the induced electromotive force waveform detected by the voltage detection circuit 13, and determines whether or not a charging completion signal is input. Determine. If this determination result is negative, the primary-side control unit 14 executes the process of step S17 again after a predetermined time has elapsed. In addition, when the determination result of step S18 is affirmative (when a charging completion signal is received), the primary side control unit 14 determines that charging is complete and ends the process.

As described above in detail, the present embodiment has the following effects.
(1) The primary side control part 14 outputs electric power intermittently in a standby state. The voltage detection circuit 13 measures the voltage of the induced electromotive force of the primary coil L <b> 1 and transmits the measurement result to the primary side control unit 14. The primary side control part 14 monitors the induced electromotive force of the primary coil L1, and when the amplitude (peak voltage) of the induced electromotive force changes, the non-contact power receiving device 20 is in a predetermined position (position where charging is possible). The charging confirmation signal and the ID confirmation signal are transmitted with the same output AC power as that at the time of charging. And the primary side control part 14 is made to charge continuously the output of the alternating current power to the primary coil L1, when the 1st and 2nd response signal is received.

And, the confirmation signal that is continuously output at the same output as when charging power is transmitted has a larger amount of information than the power in the standby state (intermittently output power). For this reason, the non-contact power transmission apparatus 10 of this embodiment is a control signal for confirming whether charging is possible (installed at a position where charging is possible and whether ID authentication is completed). The transmission / reception of the charging confirmation signal and the ID confirmation signal can be quickly terminated. Therefore, charging can be started quickly.

(2) In addition, AC power is output from the same output as when charging power is transmitted from when the confirmation signal is output. Therefore, charging can be started immediately after the non-contact power receiving apparatus 20 outputs the second response signal (that is, after the ID authentication is completed). Therefore, charging can be started quickly.

(3) Further, when the primary side control unit 14 does not receive the response signal after transmitting the confirmation signal or receives the charge completion signal, the primary side control unit 14 shifts to the power save mode after a predetermined time has elapsed, Output intermittently. That is, when charging is impossible or unnecessary, AC power is output intermittently. Thereby, the power consumption by alternating current power can be decreased.

In addition, you may change the said embodiment as follows.
The battery BA is provided in the non-contact power receiving device 20, but of course, it may be a separate body from the power receiving device 20. That is, the battery BA may be detachably attached to the non-contact power receiving device 20. Furthermore, the non-contact power receiving device 20 may be detachably attached to a device such as a portable device.

In the above embodiment, the primary side control unit 14 may continue charging until a predetermined charging time has elapsed from the start of charging.
In the above embodiment, the AC power of the primary coil L1 in the standby state (power save mode) may be arbitrarily changed as long as it is lower than the AC power during charging power transmission.

In the above embodiment, when the signal control circuit 23 of the non-contact power receiving apparatus 20 executes the load modulation process, the primary side control unit 14 determines the signal depending on whether or not the peak voltage exceeds the threshold value. The signal may be determined based on whether the amount is equal to or greater than a certain value.

In the above-described embodiment, the secondary control unit 22 has received power for driving from the battery BA, but may be supplied from the power receiving unit 21.
In the above embodiment, the primary-side control unit 14 outputs a charging confirmation signal from the non-contact power transmission device 10 when it is determined (affirmative determination) that the non-contact power receiving device 20 is installed in the device installation determination. Then, the contactless power receiving device 20 receives the charge confirmation signal, and transmits the first response signal to the contactless power transmission device 10. In this configuration, when it is determined that the non-contact power receiving device 20 is installed (affirmative determination), the non-contact power transmitting device 10 starts continuous power transmission, and the non-contact power receiving device 20 starts receiving power. A response signal may be transmitted to the non-contact power transmission apparatus 10. That is, the transmission of the charging confirmation signal may be performed by continuous power transmission from the primary coil L1 to the secondary coil L2 with the same AC power as at the time of charging.

In the above embodiment, the timing for determining the charge amount of the battery BA is before the output of the first response signal, but the charge amount may be determined before the start of charging.
In the above embodiment, when determining the amount of charge, if it is determined that charging is not required, the processing is terminated without outputting the first response signal, but a response indicating that charging is not required A signal may be output to the non-contact power transmission apparatus 10.

-In above-mentioned embodiment, when ID authentication failed (it is not a device which can be charged), the secondary side control part 22 complete | finished the process, without outputting a 2nd response signal, but ID authentication failed You may output to the non-contact power transmission apparatus 10 as a response signal that it is not a device that can be charged.

In the above embodiment, the ID is determined by the secondary control unit 22, but may be determined by the primary control unit 14.
In the above embodiment, after starting charging, the primary control unit 14 determines whether the non-contact power receiving device 20 is installed as it is (equipment installation determination) with the power waveform of the primary coil L1. Although determined, it may be determined by performing signal communication every predetermined period.

In the above embodiment, there may be no function for determining whether or not a predetermined charging time has elapsed since the start of charging.

Claims

A non-contact power transmission device that charges a load in a non-contact manner via a non-contact power receiving device,
A primary that generates alternating magnetic flux based on AC power and transmits the AC power to the non-contact power receiving device via the secondary coil by causing the alternating magnetic flux to intersect with the secondary coil of the non-contact power receiving device. Coils,
The AC power is controlled so that the AC power is intermittently output to the primary coil in the standby state, while the AC power is output to the primary coil higher in the standby state than in the standby state. An output control unit,
A measuring unit for measuring a waveform of the AC power generated in the primary coil;
A detection unit that detects that the non-contact power receiving device is installed at a chargeable position when the waveform of the AC power measured by the measurement unit changes;
The output control unit
When the detection unit detects the non-contact power receiving device, the same AC power as that during charging is output to the primary coil to change the waveform of the AC power, thereby confirming whether the load can be charged. Transmitting a confirmation signal to the non-contact power receiving device,
When a response signal indicating that charging is possible is received from the non-contact power receiving device, output of AC power to the primary coil is continued to start charging.
When the output control unit does not receive the response signal after transmitting the confirmation signal or receives the response signal indicating that charging is not required, the output control unit shifts to the standby state and again enters the primary coil. 2. The contactless power transmission device according to claim 1, wherein AC power is intermittently output.
The contactless power transmission device according to claim 1, wherein the transmission of the confirmation signal is performed by continuous power transmission from the primary coil to the secondary coil with the same AC power as in the charging.
A non-contact power transmission device including a primary coil that generates an alternating magnetic flux based on AC power, and a non-contact power reception device including a secondary coil that can be electromagnetically coupled by intersecting with the alternating magnetic flux generated in the primary coil. A contactless charging system for charging a load via the contactless power receiving device,
The contactless power transmission device is:
The AC power is controlled so that the AC power is intermittently output to the primary coil in the standby state, while the AC power is output to the primary coil higher in the standby state than in the standby state. An output control unit,
A measuring unit for measuring a waveform of the AC power generated in the primary coil;
When the waveform of the alternating current power measured by the measurement unit is changed, the detection unit detects that the non-contact power receiving device is installed at a chargeable position,
The non-contact power receiving device includes a response unit capable of responding to a control signal from the non-contact power transmission device,
The output control unit
When the detection unit detects the non-contact power receiving device, the same AC power as that during charging is output to the primary coil to change the waveform of the AC power, thereby confirming whether the load can be charged. A confirmation signal for transmitting to the non-contact power receiving device as the control signal,
When a response signal indicating that charging is possible is received from the response unit, output of AC power to the primary coil is continued to start charging.
When the output control unit does not receive the response signal after transmitting the confirmation signal or receives the response signal indicating that charging is not required, the output control unit shifts to the standby state and again enters the primary coil. 5. The contactless charging system according to claim 4, wherein AC power is intermittently output.
The non-contact charging system according to claim 4, wherein the transmission of the confirmation signal is performed by continuous power transmission from the primary coil to the secondary coil with the same AC power as in the charging.