JP2011211866A - Non-contact power transmission device, non-contact power reception device and non-contact charging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission device, a non-contact power reception device and a non-contact charging system, which are capable of correctly charging a load.SOLUTION: When a charge completion information is not stored, a primary side control section 14 causes a primary coil L1 to output a charge confirmation signal. When the charge confirmation signal is inputted, a secondary side control section 22 determines a charge amount on the basis of a voltage value of a battery BA, and if charging is possible, causes a secondary coil L2 to output a charge request signal. Then, the primary side control section 14 inputs the charge request signal, and then, supplies power to the primary coil L1 to start charging.

Description

  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 including 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 mobile 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 connection terminals for electrically connecting the charger and the portable device can be omitted by such non-contact charging, it was necessary to exchange information on whether charging is possible or not wirelessly. (See Patent Document 1 and Patent Document 2).

  In some of the inventions, when the charging is completed, the mode is shifted to the power saving mode to reduce power consumption. However, if the power consumption is reduced, there is a possibility that the secondary control element on the portable device side loses power and information that charging is completed cannot be stored, and charging may be requested intermittently. Therefore, the charger stores that the charging of the portable device is completed, and prevents charging regardless of the full charge.

JP 2008-178195 A JP 2009-206232 A

  However, when the portable device is removed (moved away) from the charger, the charger will reset the information on completion of charging so that the next installed portable device can be charged. At this time, if the same fully charged portable device is set in the charger again, there is a problem that the charger is charged until a charging completion signal is input from the portable device.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a non-contact power transmission device, a non-contact power reception device, and a non-contact charging system that can accurately charge a load.

  In order to achieve the above object, the first invention includes a primary coil that generates an alternating magnetic flux when electric power is supplied, and the alternating magnetic flux generated from the primary coil is used as a secondary coil of a non-contact power receiving device. In the non-contact power transmission device that transmits power through the secondary coil and supplies it to the load of the non-contact power receiving device, the power to the primary coil is suppressed or On the other hand, the non-contact power receiving device is based on an output control unit that outputs more power to the primary coil than in the standby state when in a charged state, and a power waveform of the primary coil measured by the measuring unit. A device determination unit that determines whether or not the battery is installed at a chargeable position, and a storage unit that stores charging completion information indicating that charging of the load has been completed. Power receiving device If it is determined by the device determination unit that it does not exist at a position where power can be supplied, the charging completion information is deleted, and the output control unit determines that the non-contact power receiving apparatus is installed at a position where charging is possible, and charging is completed. When information is not stored in the storage unit, information on the load is input from the non-contact power receiving device via the primary coil, and based on the load information on the load, the output state of the power to the primary coil is charged or standby It is characterized by being in a state.

  In a second aspect based on the first aspect, the load information is at least one of a charge request signal for requesting charge and a charge completion signal indicating completion of charge, and the output control unit is configured to receive the non-contact power reception. When it is determined that the device is installed at a position where charging is possible and charging completion information is not stored in the storage unit, when the charging request signal is input, the output state of power to the primary coil is set to the charging state. When a charging completion signal is input, charging completion information is stored in the storage unit, and the output state of power to the primary coil is set to a standby state.

  In a third aspect based on the first aspect, the output control unit determines a charge amount of the load based on the load information, and determines that the charge is possible, the power of the primary coil is When it is determined that the output state is a charging state and charging is not necessary, charging completion information is stored in the storage unit, and the output state of power to the primary coil is set to a standby state. is there.

  According to a fourth aspect of the present invention, there is provided a secondary coil that intersects with an alternating magnetic flux generated from a primary coil of a non-contact power transmission device, and a non-contact power reception device that receives power through the secondary coil and supplies the power to the load. A signal output unit that outputs load information related to the load, and the signal output unit outputs load information, and based on the load information, the non-contact power transmission apparatus transmits power to the primary coil. The output state is set to a charged state or a standby state.

  In a fifth aspect based on the fourth aspect, in the fourth aspect, the signal output unit outputs a charge request signal when the load state is monitored and can be charged, and the primary coil is supplied to the non-contact power transmission device. In the case where the output state of power to the charging state is set to the charged state and the load state is monitored and charging is not necessary, a charging completion signal is output, and the output state of the power to the primary coil is output to the non-contact power transmission device Is placed in a standby state.

  In a sixth aspect based on the fourth aspect, the signal output unit outputs the load information, makes the contactless power transmission device determine a charge amount of the load based on the load information, and can charge the load. If it is determined that the output state of power to the primary coil is set to the charged state, and if it is determined that charging is not required, the output state of power to the primary coil is set to the standby state. It is characterized by.

  According to a seventh aspect of the present invention, there is provided a non-contact power transmission device having a primary coil that generates an alternating magnetic flux when supplied with electric power, a secondary coil that intersects the alternating magnetic flux generated from the primary coil, and the secondary coil In the non-contact charging system including a non-contact power receiving apparatus having a load to which the power supplied from the primary coil is supplied, the non-contact power transmitting apparatus suppresses power to the primary coil in a standby state or On the other hand, it is determined whether or not the non-contact power receiving device is installed at a chargeable position based on an output control unit that outputs more electric power in the charged state than in the standby state and the power waveform of the primary coil. A non-contact power receiving device that includes a signal output unit that monitors a load state and outputs load information related to the load, and the output control unit is charged by the non-contact power receiving device. When it is determined that it has been installed at a possible position, the load information output from the signal output unit is input via the primary coil, and the output state of power to the primary coil is charged or standby based on the load information. It is characterized by being in a state.

  In an eighth aspect based on the seventh aspect, the contactless power transmission device includes a storage unit that stores charge completion information indicating that charging of the load is completed, and the storage unit includes the contactless power receiving device. Is not present at a chargeable position by the device determination unit, the charge completion information is deleted, and the load information is at least one of a charge request signal requesting charging and a charge completion signal indicating charging completion. The signal output unit is configured to monitor a load state and output a charge request signal when charging is possible, and output a charge completion signal when charging is unnecessary. And when the output control unit determines that the non-contact power receiving apparatus is installed at a chargeable position, and when the charge request signal is input, the output state of the power to the primary coil is charged. And charging completed If you enter an item, stores the charging completion information in the storage unit, and is characterized in that the output state of the power to the primary coil in the standby state.

  In a ninth aspect based on the seventh aspect, the contactless power transmission device includes a storage unit that stores charge completion information indicating that charging of the load is completed, and the storage unit includes the contactless power receiving device. If the device determination unit determines that the battery does not exist at a chargeable position, the charging completion information is deleted, and the signal output unit monitors the state of the load and outputs the load information to the non-contact power receiving device. The output control unit determines the charge amount of the load based on the load information, and when it is determined that charging is possible, the output state of the power to the primary coil is set to the charged state, and charging is not necessary. If it is determined, charging completion information is stored in the storage unit, and the output state of power to the primary coil is set to a standby state.

  According to the present invention, it is possible to charge the load accurately.

The block diagram which shows a non-contact charge system. The flowchart which shows the flow of a charging process. (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. The flowchart which shows the flow of a standby process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a contactless power transmitting device, a contactless power receiving device, and a contactless charging system according to the present invention are embodied will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the contactless charging system 100 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 L 1, a voltage detection circuit 13, and a primary side control unit 14.

  The voltage stabilizing circuit 11 is a circuit that stabilizes the voltage of 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 output at the time of a signal output, 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 power 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.

  Further, the primary side control unit 14 is connected to the power transmission unit 12. Then, when the non-contact power transmission device 10 outputs a signal to the non-contact power reception device 20, the primary side control unit 14 notifies the power transmission unit 12 of an output signal (or a frequency corresponding to the output signal). Thus, AC power having a frequency corresponding to the signal output to the power transmission unit 12 is generated.

  The primary control unit 14 measures changes in the induced electromotive force of the primary coil input (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 device 20 executes a load modulation process for outputting a signal to the non-contact power transmission device 10, the waveform of the induced electromotive force of the primary coil L1 changes. That is, since the non-contact power receiving device 20 outputs a signal of data “0”, if the load is reduced, the amplitude of the signal waveform of the induced electromotive force of the primary coil L1 is reduced and the signal of data “1” is output. Therefore, when the load is increased, the amplitude of the signal waveform increases. Therefore, the type of signal can be determined based 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, a signal control circuit 23, and a signal detection circuit 24. I have.

  The power reception unit 21 includes a rectifier circuit that converts AC power (inductive electromotive force) flowing through 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 outputs 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 in accordance with the output signal, 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 positive and negative electrodes of the battery BA are connected to the secondary-side control unit 22, and the secondary-side control unit 22 can grasp the charge amount of the battery BA from the voltage between the terminals of the battery BA. It can be done. 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 it is determined that it is preferable to charge the battery BA because the inter-terminal voltage of the battery BA is lower than a preset charge amount determination threshold, the secondary side control unit 22 Is supplied to the battery BA. On the other hand, when it is determined that there is no need to charge the battery BA because the voltage between the terminals of the battery BA is higher than the threshold for determining the amount of charge, the secondary control unit 22 transfers the charging power to the battery BA. Do not supply to.

  In addition, when the operating voltage is lower than the operable voltage, the secondary side control unit 22 cuts off the connection with the battery BA and prevents the reverse flow of the voltage from the battery. 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, a charging process related to charging of the battery BA will be described. The power transmission side charging process on the non-contact power transmitting apparatus 10 side and the power receiving side charging process on the non-contact power receiving apparatus 20 side will be described with reference to FIGS.

  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. 3 (a), power is output intermittently, and the power is per unit time when charging power is transmitted (during charging), The power is smaller than the power when outputting a signal of data “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.

  And the non-contact power transmission apparatus 10 performs the apparatus installation determination which determines whether the non-contact power receiving apparatus 20 was installed while outputting electric power intermittently (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 that the non-contact power receiving device 20 is installed when the waveform of the power changes in the standby state (the peak voltage is smaller than the standby state) in the device installation determination (positive determination). ). On the other hand, the primary-side control unit 14 determines that the non-contact power receiving device 20 is not installed (determination determination) when a predetermined time has elapsed without changing the power waveform in the standby state in the device installation determination. It is supposed to be.

  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, the primary side control part 14 outputs a charge confirmation signal (state confirmation request signal) to the non-contact power receiving apparatus 20, when an affirmative determination is made in the device installation determination (step S11) (step S12).

  When the primary control unit 14 outputs the charge confirmation signal, the primary control unit 14 converts (modulates) the charge confirmation signal into a combination of signals “0” or “1”, and the conversion is performed as shown in FIG. The power transmission unit 12 is controlled so that subsequent signals are output in order. As a result, the waveform of the induced electromotive force of the secondary coil L2 changes according to the charge confirmation signal to be output, 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 is input, the secondary side control unit 22 performs charging based on the voltage of the battery BA. Determine the amount. And when the charge is possible, the secondary side control part 22 outputs a charge request signal as load information (step S21). Specifically, as shown in FIG. 3J, 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 request 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 charge request signal. Thereby, as shown in FIG.3 (d), the voltage of the induced electromotive force of the primary coil L1 will change. 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 a charge request signal is input (step S13).

  When the determination result in step S13 is affirmative (when a charge request signal is input), the primary side control unit 14 outputs an ID confirmation signal indicating 1D for performing ID authentication (step S14). The process for outputting the ID confirmation signal is the same as the process for 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 is input, the secondary-side control unit 22 can charge the device (contactless power transmission). It is determined whether the ID of the apparatus 10). Then, the secondary control unit 22 outputs an ID response signal corresponding to the ID confirmation signal when the ID of the device that can be charged (when the ID authentication is completed (established)) (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. If the ID authentication fails (is not a chargeable device), the secondary control unit 22 ends the process without outputting an ID response signal, and shifts to a standby state (power save mode). That is, the secondary side control part 22 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 ID response signal is input (that is, from the non-contact power receiving device 20). It is confirmed whether or not a signal has been returned (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 in step S15 is affirmative (when an ID response signal is input), the primary-side control unit 14 starts charging with the power during charging power transmission (FIG. 3G) (step S1). S16). In the present embodiment, the power at the time of charging power transmission is continuously output as shown in FIG. 3 (c), and the period during which the power is stopped is not set. 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), the secondary control unit 22 outputs a charging completion signal indicating that charging is completed (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 non-contact power transmission device 10 is in a charged state and the non-contact power reception device 20 is removed from a predetermined location, the primary coil L1 and the secondary coil L2 are released from electromagnetic coupling, 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. Accordingly, the primary-side control unit 14 determines that the non-contact power receiving device is used when the waveform of the power of the primary coil L1 flowing during charging changes (becomes a peak voltage in the standby state) in the device installation determination in step S17. It is determined (determined negative) that 20 has been removed. On the other hand, when the primary-side control unit 14 determines that the power waveform of the primary coil L1 that flows during charging does not change (is not a peak voltage in the standby state) in the device installation determination in step S17, Is determined (positive determination) that the non-contact power receiving device 20 remains installed.

  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 input, when the apparatus installation determination of step S17 is affirmative (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. Moreover, when the determination result of step S18 is affirmative (when a charge completion signal is input) or when the determination result of step S13 is negative (when a charge request signal is not input), the primary control unit 14 It is determined that charging is complete, charging completion information indicating charging completion is stored in the RAM (step S19), and the process ends.

  Next, the standby process after the charging is completed will be described with reference to FIG. The power transmission side standby process is a process when charging completion information is stored in the RAM. When charging completion information is not stored, the power transmission side charging process is executed.

  When the charge completion information is stored in the RAM, the primary side control unit 14 intermittently outputs power in the power save mode (step S30). And the primary side control part 14 performs apparatus installation determination (step S31). Specifically, the primary-side control unit 14 changes the power waveform of the primary coil L1 when the power is intermittently output in the device installation determination in step S30 (a peak voltage in the standby state). In the case where the non-contact power receiving device 20 is removed, it is determined (negative determination). On the other hand, the primary-side control unit 14 does not change the power waveform of the primary coil L1 when the power is intermittently output in the device installation determination in step S30 (not the peak voltage in the standby state). In addition, when a certain period of time has elapsed, it is determined (positive determination) that the non-contact power receiving device 20 remains installed.

  When the determination result of step S31 is affirmative (when it is still installed), the primary-side control unit 14 executes the process of step S30 again after a predetermined time has elapsed. On the other hand, when the determination result of step S31 is negative (when removed), the primary side control unit 14 erases the charge completion information from the RAM (step S32), and proceeds to the power transmission side charging process (step S33). .

  Therefore, the voltage detection circuit 13 of this embodiment constitutes a measurement unit. Moreover, the primary side control part 14 and the power transmission part 12 comprise an output control part. Moreover, the primary side control part 14 comprises an apparatus determination part. Moreover, the primary side control part 14 comprises a memory | storage part. Moreover, the secondary side control part 22 and the signal control circuit 23 of this embodiment comprise a signal output part.

As described above in detail, the present embodiment has the following effects.
(1) When the charge confirmation signal is input, the secondary control unit 22 determines the amount of charge based on the voltage value of the battery BA, and outputs a charge request signal when charging is possible. And the primary side control part 14 was made to start charge, after inputting a charge request signal. For this reason, when the battery is in a fully charged state, excess power is not supplied, and the performance of the battery can be maintained. Further, after the charging is completed, the primary side control unit 14 stores a charging completion signal until the device installation determination is negative. And when the charge completion signal is memorize | stored, a charge confirmation signal is not output. For this reason, when the charge amount of the battery BA is full, intermittent charging can be reliably prevented.

  (2) In response to the output of the charging confirmation signal, the secondary side control unit 22 determines the amount of charge of the battery BA, and if charging is possible, outputs the charging request signal. For this reason, the primary side control part 14 can start charge correctly by the input charge request signal. Moreover, the secondary side control part 22 determines the charge amount of the battery BA, and when charge is unnecessary, it outputs a charge completion signal. For this reason, the primary side control part 14 can complete | finish charge correctly by the input charge completion signal.

(3) When the charge completion information is stored, the non-contact power transmission device 10 is in a standby state (power save mode). For this reason, power consumption can be suppressed.
In addition, you may change the said embodiment as follows.

  In the above embodiment, the charging is completed by inputting the charging completion signal. As another example, the secondary-side control unit 22 uses information for determining the charge amount of the battery BA (for example, the voltage value of the battery BA, the battery temperature, the input current amount, etc.) instead of the charge completion signal. You may output to the primary side control part 14. The primary side control unit 14 grasps the charge amount of the battery BA from the information for determining the charge amount of the battery BA, and determines whether or not the charging is completed. And when this determination result is affirmative, the primary side control part 14 complete | finishes charge.

  In the above embodiment, charging is started by inputting a charging request signal. As another example, the secondary side control unit 22 uses information (for example, a voltage value of the battery BA, a battery temperature, and an input current amount) for determining the charge amount of the battery BA instead of the charge request signal. You may output to the primary side control part 14. The primary side control unit 14 grasps the charge amount of the battery BA from the information for determining the charge amount of the battery BA, and determines whether or not charging is possible. And when this determination result is affirmative, the primary side control part 14 starts charge.

  -In above-mentioned embodiment, when the primary side control part 14 has memorize | stored charge completion information in RAM, you may stop the output of electric power. In this case, the primary side control unit 14 may output power only when the device installation determination is made.

  -In above-mentioned embodiment, when it is a power save mode, the non-contact power transmission apparatus 10 may stop the output of electric power. However, when executing the device setting determination, the non-contact power transmission apparatus 10 outputs power.

  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. This eliminates the need to input a charging completion signal. In addition, the primary side control part 14 will memorize | store charge completion information in RAM, when charge is complete | finished.

  In the above embodiment, the AC power of the primary coil L1 in the power save mode (standby state) may be arbitrarily changed as long as it is lower than the AC power during charging power transmission.

  In the above embodiment, the non-contact power transmission device 10 has been in the power save mode unless the non-contact power reception device 20 is removed once the charging completion information is stored. A charge confirmation signal may be output to confirm whether or not the battery BA needs to be charged. In addition, the non-contact power transmission apparatus 10 transfers to the process of step S14, when a charge request signal is input.

  In the above embodiment, the contactless power receiving device 20 determines the amount of charge of the battery BA when a charge confirmation signal is input from the contactless power transmission device 10, and outputs a charge request signal when charging is possible. As another example, the contactless power receiving device 20 determines whether or not charging is necessary based on the amount of charge of the battery BA when a charging confirmation signal is input. You may make it output. In such a case, the non-contact power transmission device 10 starts charging when a charging completion signal is not input. In this way, the non-contact power receiving device 20 only needs to be able to output only the charging completion signal, and the circuit configuration and processing of the non-contact power receiving device 20 can be simplified.

  In the above embodiment, the contactless power receiving device 20 outputs a charging completion signal when charging is completed, but it may not be possible to output. In this case, the non-contact power transmission device 10 outputs a charging confirmation signal periodically and continues charging as long as the charging request signal is continuously input. Further, in this case, when the charging request signal is not input, the non-contact power transmission device 10 ends the charging and stores the charging completion information in the RAM. In this way, the non-contact power receiving device 20 only needs to be able to output only the charge request signal, and the circuit configuration and processing of the non-contact power receiving device 20 can be simplified.

In the above embodiment, the primary control unit 14 intermittently outputs power in the standby state, but may reduce power by reducing current or voltage.
In the above embodiment, the secondary side control unit 22 voluntarily outputs a charge request signal or a charge completion signal without a request from the primary side control unit 14 based on the charge amount of the battery BA. May be.

  In the above embodiment, when detecting whether or not the non-contact power receiving device 20 is installed at a chargeable position, the power waveform of the primary coil L1 is referred to, but detection is performed using another coil or non-contact You may detect with the input current of the power transmission apparatus 10 or the primary coil L1, or may detect with a mechanical signal.

  -In the above embodiment, when the signal control circuit 23 of the non-contact power receiving apparatus 20 executes the load modulation process, in the signal determination by the primary side control unit 14, it is determined by whether or not the peak voltage exceeds the threshold, The change amount may be determined based on a certain value or more.

  In the above embodiment, the primary-side control unit 14 outputs a charge confirmation signal to the non-contact power receiving device 20 when it is determined (affirmative determination) that the non-contact power receiving device 20 is set in the device installation determination. The non-contact power receiving device 20 may output a charge confirmation signal to the non-contact power transmission device 10.

In the above embodiment, the timing for determining the charge amount of the battery BA is before the output of the charge request signal, but the charge amount may be determined before charging is started.
In the above embodiment, when the charge amount is determined and it is determined that charging is unnecessary, the non-contact power receiving device 20 ends the process without outputting the charge request signal, but charging is not required. A response signal to that effect may be output to the non-contact power transmission device 10.

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

In the above embodiment, the secondary side control unit 22 executes ID authentication, but the primary side control unit 14 may execute ID authentication.
In the above embodiment, the primary side control unit 14 determines whether or not the non-contact power receiving device 20 is installed as it is after the start of charging, based on the power waveform of the primary coil L1. Device installation determination may be performed by performing communication.

  DESCRIPTION OF SYMBOLS 100 ... Non-contact charging system, 10 ... Non-contact power transmission apparatus, 11 ... Voltage stabilization circuit, 12 ... Power transmission part, 13 ... Voltage detection circuit, 14 ... Primary side control part, 20 ... Non-contact power reception apparatus, 21 ... Power reception , 22 ... secondary side control part, 23 ... signal control circuit, 24 ... signal detection circuit, BA ... battery, L1 ... primary coil, L2 ... secondary coil.

Claims (9)

A primary coil that generates an alternating magnetic flux when supplied with electric power is provided, and the alternating magnetic flux generated from the primary coil is intersected with a secondary coil of a non-contact power receiving device, whereby electric power is transmitted through the secondary coil. In a non-contact power transmission device that transmits power to the load of the non-contact power reception device,
An output control unit that suppresses or stops power to the primary coil when in the standby state, and outputs more power to the primary coil than in the standby state when in the charged state;
A device determination unit that determines whether or not the non-contact power receiving device is installed at a position where charging is possible, based on the power waveform of the primary coil measured by the measurement unit;
A storage unit for storing charging completion information indicating that charging of the load is completed,
When the device determination unit determines that the non-contact power receiving device does not exist at a chargeable position, the storage unit deletes the charging completion information,
The output control unit determines that the non-contact power receiving device is installed at a chargeable position, and when charging completion information is not stored in the storage unit, information on the load from the non-contact power receiving device via the primary coil And a power output state to the primary coil is set to a charged state or a standby state based on load information regarding the load. The load information is at least one of a charge request signal for requesting charge and a charge completion signal indicating charge completion,
The output control unit determines that the non-contact power receiving device is installed at a chargeable position, and when charging completion information is not stored in the storage unit, or when the charging request signal is input, a primary coil When the power output state to the charging state is set to the charging state and the charging completion signal is input, the charging completion information is stored in the storage unit and the power output state to the primary coil is set to the standby state. The contactless power transmission device according to claim 1.   The output control unit determines the charge amount of the load based on the load information, and when it is determined that charging is possible, the output state of the power to the primary coil is set to the charged state, and charging is not necessary. The contactless power transmission device according to claim 1, wherein when it is determined, charging completion information is stored in a storage unit, and an output state of power to the primary coil is set to a standby state. In the non-contact power receiving device that receives power through the secondary coil that intersects the alternating magnetic flux generated from the primary coil of the non-contact power transmitting device and supplies the power to the load,
A signal output unit that monitors the state of the load and outputs load information related to the load,
The said signal output part outputs load information, and makes the said non-contact power transmission apparatus make the output state of the electric power to a primary coil into a charge state or a standby state based on the said load information, The non-contact power receiving apparatus characterized by the above-mentioned . The signal output unit is
When charging is possible by monitoring the state of the load, a charge request signal is output, and the non-contact power transmission device is caused to change the output state of power to the primary coil to a charged state,
5. The charging state signal is output when the load state is monitored and charging is not required, and the non-contact power transmission device is caused to set the output state of power to the primary coil to a standby state. The non-contact power receiving device described in 1.   The signal output unit outputs the load information and, based on the load information, causes the non-contact power transmission apparatus to determine a charge amount of the load, and when determining that charging is possible, to the primary coil 5. The non-contact state according to claim 4, wherein when the power output state is set to a charged state and it is determined that charging is unnecessary, the power output state to the primary coil is set to a standby state. Power receiving device. A non-contact power transmission device having a primary coil that generates an alternating magnetic flux when electric power is supplied, a secondary coil that intersects the alternating magnetic flux generated from the primary coil, and the primary via the secondary coil In a contactless charging system including a contactless power receiving device having a load to which power supplied from a coil is supplied,
The non-contact power transmission device suppresses or stops power to the primary coil in the standby state, while in the charged state based on the output control unit that outputs more power than the standby state, and the power waveform of the primary coil, A device determination unit that determines whether or not the non-contact power receiving device is installed at a chargeable position,
The non-contact power receiving apparatus includes a signal output unit that monitors a load state and outputs load information related to the load,
When it is determined that the non-contact power receiving apparatus is installed at a chargeable position, the output control unit inputs load information output from the signal output unit via the primary coil, and based on the load information, 1 A non-contact charging system, wherein an output state of power to the next coil is set to a charging state or a standby state. The non-contact power transmission device includes a storage unit that stores charging completion information indicating that charging to a load is completed,
When the device determination unit determines that the non-contact power receiving device does not exist at a chargeable position, the storage unit deletes the charging completion information,
The load information is at least one of a charge request signal for requesting charge and a charge completion signal indicating charge completion,
The signal output unit is configured to monitor a state of the load and output a charge request signal when charging is possible, and output a charge completion signal when charging is unnecessary.
The output control unit, when it is determined that the non-contact power receiving device is installed at a chargeable position, when the charge request signal is input, the output state of power to the primary coil is set to a charged state, 8. The contactless charging according to claim 7, wherein when a charging completion signal is input, charging completion information is stored in the storage unit, and an output state of power to the primary coil is set to a standby state. system. The non-contact power transmission device includes a storage unit that stores charging completion information indicating that charging to a load is completed,
When the device determination unit determines that the non-contact power receiving device does not exist at a chargeable position, the storage unit deletes the charging completion information,
The signal output unit monitors the state of the load and outputs load information to the non-contact power receiving device.
The output control unit determines the charge amount of the load based on the load information, and when it is determined that charging is possible, the output state of the power to the primary coil is set to the charged state, and charging is not necessary. The contactless charging system according to claim 7, wherein when it is determined, charging completion information is stored in the storage unit, and an output state of power to the primary coil is set to a standby state.

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