JP2014217116A - Electronic apparatus, electronic apparatus power transmission system and power reception control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus, an electronic apparatus power transmission system and a power reception control method capable of preventing degradation of transmission efficiency due to a fluctuation of inductance value on an electromagnetic coil at the power reception side by a magnet of a magnet-holding type charging platform.SOLUTION: An electronic apparatus 2 is capable of switching the resonance frequency of an electromagnetic coil 11 of a power reception unit 10 and is capable of giving an instruction to a charger 3 to raise transmission power and to stop the power transmission. When the power value of the received power is smaller than a predetermined power value while the power reception unit 10 receives the power, the resonance frequency is switched. With this, the transmission efficiency can be prevented from degrading due to a fluctuation of inductance value on the electromagnetic coil 11 at the power reception side by the magnet of the charger 3 as the magnet-holding type charging platform.

Description

  The present invention relates to an electronic device having a contactless charging function, an electronic device power transmission system including the electronic device and a charger having a contactless charging function, and a power reception control method in contactless charging.

  In recent years, electronic devices having a contactless charging function (for example, mobile terminals such as smartphones) have been distributed in the market. As an apparatus for performing contactless charging, for example, there are devices described in Patent Document 1 and Patent Document 2.

  Patent Document 1 discloses a proximity wireless charging AC adapter including a primary side resonance capacitor and a primary side coil connected in parallel to the primary side resonance capacitor and tuned to the primary side resonance capacitor in a predetermined power carrier frequency band. And a portable device comprising a secondary side coil and a secondary side resonance capacitor connected to the secondary side coil and tuned in a predetermined power carrier frequency band, and a proximity wireless charging AC adapter in the predetermined power carrier frequency band The primary coil and the secondary coil of the mobile device are tuned to lower the operating impedance, and the mobile device is charged in a non-contact manner by magnetic loose coupling.

  On the other hand, in Patent Document 2, switching means for switching a resonance frequency related to power reception to a first resonance frequency or a second resonance frequency different from the first resonance frequency, and charging for acquiring a charge state of the secondary battery State acquisition means, and control means for controlling switching by the switching means so as to perform power reception at the second resonance frequency over a predetermined time with respect to the charge state acquired by the charge state acquisition means. A power transmission device comprising: a power receiving device provided; a detection unit configured to detect a current flowing through the power transmission coil; and a current reduction time determination unit configured to determine a time during which the current flowing through the power transmission coil has decreased according to a detection result of the detection unit. Discloses that the voltage value and / or current value of the electric power to be transmitted is adjusted in accordance with the current decrease time determined by the current decrease time determination means of the power transmission device.

JP 2012-143093 A JP2013-005526A

  Incidentally, WPC (Wireless Power Consortium) is an international standard for contactless charging. One of the standard specifications of this WPC is a magnet attraction type. This magnet attraction type installs a magnet at the center of the electromagnetic coil of the charging base on the power transmission side and guides the installation position on the power reception side by its magnetic force. It is. However, in this magnet attraction type, there is a problem that the inductance value of the electromagnetic coil on the power receiving side fluctuates due to the magnet provided on the charging stand, the resonance frequency during power transmission shifts, and transmission efficiency deteriorates.

  In addition, when the transmission efficiency is deteriorated, a request for increasing the transmission power is generated from the power receiving side to the power transmission side, and if this continues, there is a problem that the foreign object detection operation is induced and charging is not continued. Here, the foreign object detection uses an operation in which a metal foreign object absorbs power and generates a power increase request when necessary power cannot be obtained on the power receiving side. The insertion of a foreign object is detected and power transmission is stopped. Thus, since power transmission is stopped when the foreign object detection operation is induced, charging cannot be continued thereafter.

  The present invention has been made in view of such circumstances, and an electronic apparatus and an electronic device that can suppress deterioration in transmission efficiency due to fluctuations in the inductance value of the electromagnetic coil on the power receiving side due to the magnet of the magnet attraction type charging stand An object is to provide a device power transmission system and a power reception control method.

  An electronic device of the present invention includes an electromagnetic coil, and includes a power receiving unit that receives power via the electromagnetic coil, and a resonance circuit unit that can switch a resonance frequency of the electromagnetic coil, and at least externally, An electronic device capable of instructing an increase in transmitted power and stoppage of power transmission, wherein the power receiving unit is receiving power, and the power value of the received power is smaller than a predetermined power value, When the resonance frequency is switched and then the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given, and then the power value of the received power is still smaller than the predetermined power value. In the case, the stop of the power transmission is instructed.

  According to the above configuration, when the power receiving unit is receiving power, when the power value of the received power is smaller than the predetermined power value, the resonance frequency of the electromagnetic coil is switched. Can be suppressed. That is, it is possible to suppress deterioration in transmission efficiency due to fluctuations in the inductance value of the electromagnetic coil on the power receiving side by the magnet of the charger that is a magnet suction type charging stand.

  Even if the resonance frequency of the electromagnetic coil is switched, if the power value of the received power is smaller than the predetermined power value, an instruction to increase the transmitted power is given, so that charging can be continued. Even if the transmission power is increased by instructing an increase in the transmission power, if the power value of the received power is still smaller than the predetermined power value, the stop of the transmission is instructed, so that useless power consumption can be suppressed. At the same time, power transmission can be appropriately stopped when a foreign object is present.

  In the above configuration, when the power receiving unit is receiving power and the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched from the first frequency to a second frequency smaller than the first frequency, Thereafter, when the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given. After that, when the power value of the received power is still smaller than the predetermined power value, Instruct to stop.

  In the above-described configuration, a secondary battery is provided, and the secondary battery can be charged based on the power received by the power receiving unit.

  In the above configuration, when the power receiving unit is receiving power, if the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched, and then the power value of the received power is still the predetermined power value. If smaller, instruct to increase the transmitted power, and then, if the power value of the received power is still smaller than the predetermined power value, instruct to stop the power transmission, the power value of the received power is at least the When the power value is larger than the predetermined power value, the secondary battery is charged at least until the voltage of the secondary battery becomes a predetermined voltage.

  The said structure WHEREIN: The instruction | indication of the said transmission power raise and / or the instruction | indication of the said power transmission stop are transmitted via the electromagnetic coil of the said power receiving part.

  The electronic device power transmission system of the present invention includes the electronic device, an electromagnetic coil, a power transmission unit that transmits power through the electromagnetic coil, and the transmission power corresponding to an instruction to increase transmission power from the outside. And a power transmitter for stopping the power transmission in response to an instruction to stop power transmission from the outside.

  According to the above configuration, it is possible to obtain an electronic device power transmission system capable of efficient charging while suppressing deterioration in transmission efficiency in power transmission from the power transmitter to the electronic device.

  The said structure WHEREIN: The instruction | indication of the said transmitted power increase and / or the said instruction | indication of the power transmission stop are received in the said power transmitter via the electromagnetic coil of the said power transmission part.

  In the above configuration, the power transmitter is supplied with electric power from an external commercial power source.

  The power reception control method of the present invention includes an electromagnetic coil, and includes a power reception unit that receives power via the electromagnetic coil, and a resonance circuit unit that can switch a resonance frequency of the electromagnetic coil. A power reception control method usable in an electronic device capable of instructing at least an increase in transmitted power and a stop of power transmission, wherein the power value of the received power is received while the power receiving unit is receiving power. When the power value of the received power is smaller than the predetermined power value, the resonance frequency is switched, and then, when the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given. When the value is smaller than the predetermined power value, the stop of the power transmission is instructed.

  According to the above method, when the power receiving unit is receiving power, when the power value of the received power is smaller than the predetermined power value, the resonance frequency of the electromagnetic coil is switched. Can be suppressed. That is, it is possible to suppress deterioration in transmission efficiency due to fluctuations in the inductance value of the electromagnetic coil on the power receiving side by the magnet of the charger that is a magnet suction type charging stand.

  Even if the resonance frequency of the electromagnetic coil is switched, if the power value of the received power is smaller than the predetermined power value, an instruction to increase the transmitted power is given, so that charging can be continued. Even if the transmission power is increased by instructing an increase in the transmission power, if the power value of the received power is still smaller than the predetermined power value, the stop of the transmission is instructed, so that useless power consumption can be suppressed. At the same time, power transmission can be appropriately stopped when a foreign object is present.

  ADVANTAGE OF THE INVENTION According to this invention, deterioration of the transmission efficiency by the inductance value of the electromagnetic coil of a call | power receiving side changing by the magnet of a magnet attraction | suction type charging stand can be suppressed.

The block diagram which shows schematic structure of the electronic device power transmission system which concerns on one embodiment of this invention The figure which shows the schematic structure of the resonance circuit part of the electronic device in the electronic device power transmission system of FIG. 1, and the connection relation with a power receiving part, a rectification | straightening part, and a power reception control part. The flowchart which shows the operation | movement of the receiving control part of the electronic device of FIG. 1, and the charging process operation | movement in the power transmission control part of a charger. The flowchart which shows the operation | movement of the electric power reception control part of the electronic device of FIG. 1, and the electric power control processing operation in the electric power transmission control part of a charger.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of an electronic device power transmission system according to an embodiment of the present invention. In the figure, an electronic device power transmission system 1 according to the present embodiment includes an electronic device 2 and a charger (power transmitter) 3. In addition, although the electronic device 2 of the electronic device power transmission system 1 which concerns on this Embodiment is used as portable terminals, such as a smart phone, description of the function itself of a portable terminal is abbreviate | omitted. In addition, the charger 3 of the electronic device power transmission system 1 according to the present embodiment has a magnet installed in the center of a power transmission coil (electromagnetic coil 26 described later) and guides the installation position of the electronic device 2 by its magnetic force. It is a type of charging stand.

  The electronic device 2 includes a power reception unit 10, a resonance circuit unit 12, a rectification unit 13, a power reception control unit 14, a charge control unit 15, and a battery pack 16. The power receiving unit 10 includes an electromagnetic coil (power receiving coil) 11 and receives power transmitted from the charger 3. The resonance circuit unit 12 changes the resonance frequency of a resonance circuit configured with the electromagnetic coil 11 of the power reception unit 10. FIG. 2 is a diagram illustrating a schematic configuration of the resonance circuit unit 12 and a connection relationship between the power reception unit 10, the rectification unit 13, and the power reception control unit 14. In the figure, the resonance circuit unit 12 does not connect the capacitor 121 connected in series with the electromagnetic coil 11 of the power receiving unit 10, the capacitor 122 connected in parallel with the capacitor 121, and the capacitor 122 to the capacitor 121. FET123 which performs switching is provided. The FET 123 operates as a switch, and the capacitor 122 is connected in parallel with the capacitor 121 by being turned on. Here, when the capacitance of the capacitor 121 is C1, and the capacitance of the capacitor 122 is C2, the combined capacitance is C1 + C2 by turning on the FET 123. As the capacitance of the resonance circuit unit 12 increases, the resonance frequency decreases. That is, assuming that the resonance frequency in the case of the capacitor 121 alone is the first frequency, the resonance frequency becomes a second frequency lower than the first frequency by connecting the capacitor 121 in parallel with the capacitor 122. On / off control for the FET 123 is performed by the power reception control unit 14.

  Returning to FIG. 1, the rectifying unit 13 rectifies the received power (AC power) received by the power receiving unit 10 and output from the resonant circuit unit 13 to output DC power. The power reception control unit 14 operates with the DC power output from the rectification unit 13 and detects the power received by the power reception unit 10 immediately after the operation starts. Although details will be described later, the charger 3 initially receives power of such a magnitude that the power reception control unit 14 and the charge control unit 15 are activated (referred to as “first power”). The power is transmitted, and thereafter, power of a magnitude that can charge the battery cell (secondary battery) 17 of the battery pack 16 (hereinafter referred to as “second power”) is transmitted. In this case, the second power> the first power.

  After starting the operation, the power reception control unit 14 transmits the signal strength to the charger 3, and further transmits ID and setting information. The power reception control unit 14 starts charging after transmitting the signal strength, ID, and setting information. At this time, since the second power is transmitted from the charger 3, the charging control unit 15 starts charging the battery cell 17 of the battery pack 16. When charging is started, the power reception control unit 14 detects the received power of the power receiving unit 10 and determines whether or not the detected power has reached a predetermined value (predetermined power value). When the detected power does not reach the predetermined value (that is, smaller than the predetermined power value), the charger 3 is instructed to increase the transmission power. That is, a signal for increasing the transmission power is transmitted to the charger 3 via the power receiving unit 10. The power reception control unit 14 detects the power reception power of the power reception unit 10 after instructing the charger 3 to increase the transmission power. Then, it is determined whether or not the detected power has reached a predetermined value (predetermined power value). If the detected power has not reached the predetermined value (less than the predetermined power value), the charger 3 is again connected. To instruct the increase in transmitted power. If the power does not reach the predetermined value even if an instruction to increase the transmission power is given, an instruction to continue to increase the transmission power is given. If the instruction reaches the predetermined number of times, the resonance circuit unit 12 is switched. Lower the resonance frequency.

  The power reception control unit 14 detects the received power of the power reception unit 10 after lowering the resonance frequency of the resonance circuit unit 12, but the detected power does not reach a predetermined value (predetermined power value) (that is, the predetermined power value). If the power value is smaller than the power value), it is determined that foreign matter is inserted, and the charger 3 is instructed to stop power transmission. That is, a signal for stopping power transmission is transmitted to the charger 3 via the power receiving unit 10. On the other hand, when the detected power reaches a predetermined value (predetermined power value) or more (when it is larger than the predetermined power value) and the battery cell 17 is fully charged, the charging is stopped and the charger 3 is instructed to stop power transmission.

  The charging control unit 15 starts with DC power output from the rectifying unit 13 (power based on the first power received by the power receiving unit 10), and then the DC power based on the second power is output from the rectifying unit 13. By being output, charging of the battery cells 17 of the battery pack 16 is started. The battery pack 16 has a structure that can be freely attached to and detached from the apparatus main body, and is electrically connected to the electronic apparatus 2 via the + terminal 18 and the − terminal 19 by being attached to the apparatus main body.

  The charger 3 transmits electric power for charging the battery cells 17 of the battery pack 16 to the electronic device 2, and controls the power transmission unit 27 having an electromagnetic coil (power transmission coil) 26 and the power transmission unit 27. A power transmission control unit that performs power transmission in accordance with an instruction from the electronic device 2. The power transmission unit 27 transmits electric power for charging via the electromagnetic coil 26. The electromagnetic coil 26 on the charger 3 side and the electromagnetic coil 11 on the electronic device 2 side are electromagnetically coupled, whereby the power from the charger 3 is transmitted to the electronic device 2. The power transmission control unit 28 operates by receiving power supply from an external commercial power supply 29. Although not shown, the charger 3 has a magnet installed at the center of the electromagnetic coil 26 and guides the installation position of the electronic device 2 by the magnetic force of the magnet.

Next, operations of electronic device 2 and charger 3 of electronic device power transmission system 1 according to the present embodiment will be described.
FIG. 3 is a flowchart showing charging processing operations in the power reception control unit 14 of the electronic device 2 and the power transmission control unit 28 of the charger 3. FIG. 4 is a flowchart showing power control processing operations in the power reception control unit 14 of the electronic device 2 and the power transmission control unit 28 of the charger 3. In the figure, although there are operations by some people's hands, they are expressed as steps as they are.

  First, when the electronic device 2 is placed on the charger 3 which is a charging stand (step S1), the power transmission control unit 28 of the charger 3 detects that the electronic device 2 is placed and its position (step S30). . Next, the power transmission control unit 28 transmits power (first power) that can activate the power reception control unit 14 and the charging control unit 15 of the electronic device 2 (step S31).

  In the electronic device 2, the power (first power) that can activate the power reception control unit 14 and the charge control unit 15 is transmitted from the charger 3, so that the power supply of the power reception control unit 14 and the charge control unit 15 is changed. Turns on (that is, the power reception control unit 14 and the charge control unit 15 are activated, step S2). When activated, the power reception control unit 14 transmits the signal strength to the charger 3 in a packet (step S3). Further, the ID and setting information of the electronic device 2 are transmitted in a packet (step S4). The processes in steps S3 and S4 are processes based on the WPC (Wireless Power Consortium) standard.

  In the charger 3, when the power transmission control unit 28 receives the signal strength, ID, and setting information transmitted from the electronic device 2 (steps S <b> 32 and S <b> 33), the power transmission control unit 28 is large enough to charge the battery cell 17 of the electronic device 2. Power (second power, for example, less than 4 W) is transmitted (step S34). Note that the processes in steps S30 to S34 are processes based on the WPC standard.

  In the electronic device 2, the power reception control unit 14 starts charging the battery cell 17 by receiving power (second power) that is large enough to charge the battery cell 17 from the charger 3 (step S <b> 1). S5).

  After the power transmission control unit 28 of the charger 3 starts transmitting the second power and the charging control unit 15 of the electronic device 2 starts charging the battery cell 17 with the second power, the power transmission control of the charger 3 is performed. The unit 28 and the power reception control unit 14 of the electronic device 2 start the power control process. 4, first, the power reception control unit 14 of the electronic device 2 performs initial setting of the resonance circuit unit 12 (step S6). That is, the FET 123 of the resonance circuit unit 12 is turned off to disconnect the capacitor 122 from the circuit, and the resonance circuit unit 12 is the capacitor 121 only. Next, the power reception control unit 14 determines whether or not predetermined power has been received (step S7). That is, it is determined whether the transmission efficiency is good. When it is determined that the predetermined power is received (when it is determined that the transmission efficiency is good, that is, when “Yes” is determined in step S7), the power transmission efficiency from the charger 3 to the electronic device 2 is good. This process is terminated.

  On the other hand, when it is determined that the predetermined power cannot be received (when it is determined that the transmission efficiency is not good, that is, when “No” is determined in step S7), the power transmission efficiency from the charger 3 to the electronic device 2 Is not good, the charger 3 is requested to increase the transmission power (step S8). In response to the request to increase the transmission power, the power transmission control unit 28 of the charger 3 increases the transmission power (step S35). The power reception control unit 14 of the electronic device 2 requests the charger 3 to increase transmission power, and then determines whether or not predetermined power has been received (step S9). When it is determined that the predetermined power can be received (when it is determined that the transmission efficiency is good, that is, when “Yes” is determined in step S9), the power transmission efficiency from the charger 3 to the electronic device 2 is improved. As a result, the process is terminated via step S7.

  On the other hand, when it is determined that the predetermined power cannot be received (that is, when “No” is determined in the determination in step S9), the transmission efficiency from the charger 3 to the electronic device 2 is increased even if the transmission power is increased. If it is not improved, an increase in power is requested again, and it is determined whether the increase request is a specified number (step S10). That is, it is determined whether the number of requests for increase has reached a specified number. When it is determined that the increase request is not the specified number (that is, when “No” is determined in step S10), the process returns from step S7 to step S8 to request the charger 3 to increase the transmission power.

  On the other hand, when it is determined that the increase request is the prescribed number (that is, when “Yes” is determined in step S10), it is determined whether the resonance circuit unit 12 has been switched (step S11). When it is determined that 12 is not switched (when it is determined “No” in step S11), the resonance circuit unit 12 is switched (step S12). That is, the FET 123 of the resonance circuit unit 12 is turned on and the capacitor 122 is inserted into the circuit. Thereby, the electrostatic capacitance in the resonance circuit unit 12 increases, and the resonance frequency of the resonance circuit unit 12 decreases. After switching the resonance circuit unit 12, the power reception control unit 14 returns to step S7, determines whether or not predetermined power can be received, and then performs the same processing as described above. On the other hand, when it is determined that the resonance circuit unit 12 has been switched in step S11 (when “Yes” is determined in step S11), it is determined that foreign matter is inserted (step S13), and this process is terminated. That is, if the transmission power is not improved even if the transmission power is increased a specified number of times and the resonance circuit unit 12 is switched, it is determined that a metal foreign object is inserted.

  Returning to FIG. 3, the power reception control unit 14 of the electronic device 2 determines whether or not a foreign object has been detected after finishing the power control process (step S <b> 14). When it is determined that a foreign object has been detected (when it is determined “Yes”), charging is stopped (step S16), and the charger 3 is instructed to stop power transmission (step S17). The power transmission control unit 28 of the charger 3 stops power transmission in response to an instruction to stop power transmission (step S36). Here, the case where a foreign object is detected is a case where foreign object insertion is determined in step S13 of the power control process, and otherwise, “No” determination is made in step S14. When it is determined as “No” in step S14, it is determined whether or not the charging to the battery cell 17 is fully charged (step S15). When it is determined that the battery cell 17 is not fully charged (when determined as “No”), the power control process is performed. Return. On the other hand, when it determines with full charge (when it determines with "Yes"), charge is stopped (step S16) and transmission stop is instruct | indicated (step S17).

As described above, according to the electronic device power transmission system 1 according to the present embodiment, the electronic device 2 can switch the resonance frequency of the electromagnetic coil 11 of the power receiving unit 10 and transmit power to the charger 3. And when the power reception unit 10 is receiving power and the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched to Therefore, it is possible to suppress deterioration in transmission efficiency due to fluctuation of the inductance value of the electromagnetic coil 11 on the power receiving side by the magnet of the charger 3 which is a magnet suction type charging base.
Even if the resonance frequency is switched, if the power value of the received power is smaller than the predetermined power value, an instruction to increase the transmitted power is given, so that charging can be continued.
Even if the transmission power is increased by instructing an increase in the transmission power, if the power value of the received power is still smaller than the predetermined power value, the stop of the transmission is instructed, so that useless power consumption can be suppressed. At the same time, power transmission can be appropriately stopped when a foreign object is present.

  In the electronic device power transmission system 1 according to the present embodiment, when the received power does not reach the predetermined value, the transmitted power is increased, and even when the transmitted power is increased, the received power does not reach the predetermined value. The resonance frequency is switched, but this order may be reversed. That is, the resonance frequency may be switched first and then the transmission power may be increased.

  Moreover, in the electronic device power transmission system 1 according to the present embodiment, the instruction from the electronic device 2 to the charger 3 is performed through the power receiving unit 10, but the instruction is transmitted without passing through the power receiving unit 10. You may do it. For example, it is possible to provide a dedicated antenna and send an instruction from this antenna.

  Moreover, although the electronic device power transmission system 1 according to the present embodiment is configured by an electronic device 2 that is a mobile terminal such as a smartphone and a charger 3 that is a charging stand for the electronic device 2, for example, a wired connection telephone It is also possible to comprise a slave unit and its charging stand.

  INDUSTRIAL APPLICABILITY The present invention has an effect that it is possible to suppress deterioration of transmission efficiency due to fluctuation of the inductance value of the electromagnetic coil on the power receiving side by the magnet of the magnet suction type charging stand, and a portable terminal equipped with a contactless charging function It can be applied to electronic devices such as

DESCRIPTION OF SYMBOLS 1 Electronic device power transmission system 2 Electronic device 3 Charger 10 Power receiving part 11,26 Electromagnetic coil 12 Resonance circuit part 13 Rectification part 14 Power reception control part 15 Charging control part 16 Battery pack 17 Battery cell 18 + terminal 19-Terminal 27 Power transmission part 28 Power transmission control unit 29 Commercial power supply

Claims (9)

A power receiving unit that includes an electromagnetic coil and receives electric power via the electromagnetic coil;
A resonance circuit unit capable of switching a resonance frequency of the electromagnetic coil;
With
It is possible to instruct the outside to at least increase transmission power and stop transmission.
Electronic equipment,
While the power receiving unit is receiving power, when the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched,
Thereafter, if the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given.
Thereafter, when the power value of the received power is still smaller than the predetermined power value, the stop of the power transmission is instructed.
Electronics. The electronic device according to claim 1,
When the power receiving unit is receiving power and the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched from the first frequency to a second frequency smaller than the first frequency,
Thereafter, if the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given.
Thereafter, when the power value of the received power is still smaller than the predetermined power value, the stop of the power transmission is instructed.
Electronics. The electronic device according to claim 1 or 2,
With a secondary battery,
Based on the power received by the power receiving unit, the secondary battery can be charged,
Electronics. The electronic device according to claim 3,
While the power receiving unit is receiving power, when the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched,
Thereafter, if the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given.
After that, when the power value of the received power is still smaller than the predetermined power value, the stop of power transmission is instructed, and when the power value of the received power is at least larger than the predetermined power value, at least the secondary battery The secondary battery is charged until the voltage reaches a predetermined voltage.
Electronics. The electronic device according to any one of claims 1 to 4,
The instruction to increase the transmitted power and / or the instruction to stop the power transmission is transmitted via the electromagnetic coil of the power receiving unit.
Electronics. The electronic device according to any one of claims 1 to 5,
An electromagnetic coil, and a power transmission unit that transmits electric power through the electromagnetic coil,
In response to an instruction to increase the transmitted power from the outside, increase the transmitted power,
In response to an instruction to stop power transmission from the outside, a power transmitter that stops the power transmission,
Having
Electronic equipment power transmission system. The electronic device power transmission system according to claim 6,
The instruction to increase the transmission power and / or the instruction to stop power transmission is received via the electromagnetic coil of the power transmission unit in the power transmitter.
Electronic equipment power transmission system. The electronic device power transmission system according to claim 6 or 7,
The power transmitter is supplied with electric power from an external commercial power source.
Electronic equipment power transmission system. A power receiving unit that includes an electromagnetic coil and receives electric power via the electromagnetic coil;
A resonance circuit unit capable of switching a resonance frequency of the electromagnetic coil;
With
It is possible to instruct the outside to at least increase transmission power and stop transmission.
A power reception control method usable in an electronic device,
While the power receiving unit is receiving power, when the power value of the received power is smaller than a predetermined power value, the resonance frequency is switched,
Thereafter, if the power value of the received power is still smaller than the predetermined power value, an instruction to increase the transmitted power is given.
Thereafter, when the power value of the received power is still smaller than the predetermined power value, the stop of the power transmission is instructed.
Power reception control method.

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