JP6227359B2 - Power receiving device, communication control method, computer program, and power feeding device - Google Patents

Description

  The present invention relates to a technical field of a power receiving device, a communication control method, a computer program, and a power feeding device that constitute a non-contact power transmission system.

  In a non-contact power transmission system that uses this type of device as a component and performs non-contact power transmission from a power transmitting side device having a power source to a power receiving side device, information is exchanged between the power transmitting side device and the power receiving side device by wireless communication. Is often performed.

  For this reason, the influence of the interruption of wireless communication during power transmission is avoided. For example, Patent Literature 1 communicates with a power transmission side device having a first wireless communication device and a third wireless communication device, a second wireless communication device that communicates with the first wireless communication device, and the third wireless communication device. A non-contact power transmission system including a power receiving device having a fourth wireless communication device is described.

  Alternatively, a technique has been proposed that allows a certain level of communication interruption by reducing the frequency of communication between the power transmitting side device and the power receiving side device (that is, by increasing the communication interval).

JP 2013-115939 A

  In communication between the power transmission side device and the power reception side device, for example, information relating to the state of the battery electrically connected to the power reception side device is exchanged. For this reason, the power control can be performed with relatively high accuracy when the communication frequency between the power transmission side device and the power reception side device is relatively high.

  However, when the communication frequency is relatively high, there is a technical problem that the stability of the non-contact power transmission system may be reduced when communication interruption occurs. Further, the technique described in Patent Document 1 requires at least four wireless communication devices, and there is a technical problem that the manufacturing cost may increase or the control may become complicated.

  The present invention has been made in view of the above-described problems, for example, and improves the accuracy of power control related to a battery electrically connected to a power receiving device while suppressing the influence of communication interruption of wireless communication. It is an object of the present invention to provide a power receiving device, a communication control method, a computer program, and a power feeding device that can perform the above.

In order to solve the above-described problems, a power receiving device of the present invention is a power receiving device that can receive power from a power feeding device in a contactless manner and is electrically connected to a battery that is charged by a constant current constant voltage method. Communication means capable of performing wireless communication with the power supply apparatus, and the frequency of the wireless communication when the battery is charged at a constant voltage is the same as that of the wireless communication when the battery is charged at a constant current. Communication control means for changing the frequency of the wireless communication according to the state of the battery so as to be higher than the frequency.

In order to solve the above-described problem, the first communication control method of the present invention is electrically connected to a battery that can receive power from a power supply device in a contactless manner and is charged by a constant current and constant voltage charging method. In the communication control method in the power receiving device, the frequency of the wireless communication when the battery is charged with a constant voltage is higher than the frequency of the wireless communication when the battery is charged with a constant current. There is provided a communication control step of changing the frequency of wireless communication performed with the power feeding device according to the state of the battery.

In order to solve the above-described problem, the first computer program of the present invention is electrically connected to a battery that can receive power from a power supply device in a contactless manner and is charged by a constant current constant voltage charging method . The frequency of the wireless communication when the battery is charged at a constant voltage with respect to a computer mounted on a power receiving device including communication means capable of performing wireless communication with the power supply device is charged with the battery at a constant current. And functioning as a communication control means for changing the frequency of the wireless communication in accordance with the state of the battery so as to be higher than the frequency of the wireless communication at the time.

In order to solve the above-described problem, the power supply device of the present invention is a power supply device that can supply power in a contactless manner to a power receiving device that is electrically connected to a battery that is charged by a constant current constant voltage charging method. The communication means capable of performing wireless communication with the power receiving device, and the frequency of the wireless communication when the battery is charged with a constant voltage is the wireless communication when the battery is charged with a constant current Communication control means for changing the frequency of the wireless communication according to the state of the battery acquired via the communication means so as to be higher than the frequency of the communication.

In order to solve the above-described problem, the second communication control method of the present invention can supply power in a non-contact manner to a power receiving device electrically connected to a battery charged by a constant current constant voltage charging method. And a communication control method in a power feeding device capable of performing wireless communication with the power receiving device, wherein the frequency of the wireless communication when the battery is charged at a constant voltage is determined by charging the battery at a constant current. A communication control step of changing the frequency of the wireless communication according to the state of the battery acquired via the wireless communication so as to be higher than the frequency of the wireless communication when the wireless communication is performed .

In order to solve the above problem, the second computer program of the present invention can supply power in a non-contact manner to a power receiving device electrically connected to a battery charged by a constant current constant voltage charging method. And the frequency of the wireless communication when the battery is charged at a constant voltage with respect to a computer mounted on a power supply device capable of performing wireless communication with the power receiving device is charged with the battery at a constant current. And function as communication control means for changing the frequency of the wireless communication according to the state of the battery acquired via the wireless communication so as to be higher than the frequency of the wireless communication at that time.

  The effect | action and other gain of this invention are clarified from the form for implementing demonstrated below.

It is a block diagram which shows the structure of the non-contact electric power transmission system which concerns on an Example. It is a conceptual diagram of the battery charging method which concerns on an Example. It is a flowchart which shows the charge control process which concerns on an Example. It is a flowchart which shows the charge control process which concerns on the 1st modification of an Example.

  An embodiment according to the power receiving device and the like of the present invention will be described.

(Power receiving device)
The power receiving device according to the embodiment is configured to be able to receive power from the power feeding device in a contactless manner. The power receiving device is electrically connected to the battery, and the battery can be charged with the received power. Here, the battery is a battery mounted on a vehicle such as an electric vehicle.

  The power receiving apparatus includes a communication unit capable of performing wireless communication with the power supply apparatus. When the battery is charged by the power receiving apparatus, for example, the battery charging state, request Information such as a voltage value and a required current value is transmitted and received.

  The power receiving apparatus further includes communication control means for changing the frequency of wireless communication according to the state of the battery. For example, when a so-called constant current constant voltage charging method is used as a battery charging method, the communication control means needs to finely adjust the current value until the voltage of the battery in which constant current charging is performed reaches a specified voltage. Since there is no communication, the communication frequency is relatively low. On the other hand, the communication control means makes the communication frequency relatively high after the voltage of the battery on which constant voltage charging is performed becomes the specified voltage.

  If comprised in this way, in the period when constant-current charge is implemented, while being able to make it hard to be influenced by communication interruption, for example, in the period when constant-voltage charge is implemented, it improves the control accuracy of a current value. Can do.

  In one aspect of the power receiving device according to the embodiment, the communication control unit changes the frequency of wireless communication according to the voltage value or temperature of the battery.

  According to this aspect, when the battery is charged by the so-called constant current constant voltage charging method, it can be detected relatively easily that the voltage of the battery has reached the specified voltage, which is very advantageous in practice. .

  In another aspect of the power receiving device according to the embodiment, the communication control unit increases the frequency of wireless communication when the voltage value of the battery reaches the specified voltage than before the voltage value of the battery reaches the specified voltage.

  According to this aspect, the power control accuracy can be made relatively easy and improved, which is very advantageous in practice.

  Alternatively, in another aspect of the power receiving device according to the embodiment, the communication control unit gradually increases the frequency of wireless communication after the voltage value of the battery reaches the specified voltage.

  According to this aspect, the power control accuracy can be made relatively easy and improved, which is very advantageous in practice.

  Alternatively, in another aspect of the power receiving device according to the embodiment, when the temperature of the battery reaches a specified temperature, the communication control unit increases the frequency of wireless communication higher than before the temperature of the battery reaches the specified temperature.

  According to this aspect, the power control accuracy can be made relatively easy and improved, which is very advantageous in practice.

  Alternatively, in another aspect of the power receiving device according to the embodiment, the communication control unit gradually increases the frequency of wireless communication after the temperature of the battery reaches a specified temperature.

  According to this aspect, the power control accuracy can be made relatively easy and improved, which is very advantageous in practice.

(First communication control method)
The first communication control method according to the embodiment is a communication control method in a power receiving device that can receive power from a power device in a contactless manner and is electrically connected to a battery. The communication control method includes a communication control step of changing the frequency of wireless communication performed with the power supply apparatus according to the state of the battery.

  According to the first communication control method according to the embodiment, similarly to the power receiving device according to the above-described embodiment, the battery that is electrically connected to the power receiving device is suppressed while suppressing the influence of the communication interruption of the wireless communication. The accuracy of power control can be improved.

(First computer program)
A first computer program according to an embodiment is capable of receiving power from a power feeding device in a contactless manner, and is electrically connected to a battery, and includes a communication unit that can perform wireless communication with the power feeding device. A computer mounted on the apparatus is caused to function as communication control means for changing the frequency of the wireless communication in accordance with the state of the battery.

  According to the first computer program according to the embodiment, a recording medium such as a RAM (Random Access Memory), a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (DVD Read Only Memory) or the like for storing the computer program. Then, if the computer program is read and executed by a computer provided in the power receiving device, or if the computer program is downloaded and executed via communication means, the power receiving device according to the above-described embodiment Can be realized relatively easily. Thereby, similarly to the power receiving device according to the above-described embodiment, it is possible to improve the accuracy of power control related to the battery electrically connected to the power receiving device while suppressing the influence of the communication interruption of the wireless communication.

(Power supply device)
The power supply apparatus according to the embodiment is configured to be able to supply power in a non-contact manner to a power reception apparatus electrically connected to a battery. The power supply apparatus includes communication means capable of performing wireless communication with the power receiving apparatus, and communication control means for changing the frequency of wireless communication according to the state of the battery acquired through the communication means. .

  According to the power supply device according to the embodiment, similarly to the power reception device according to the above-described embodiment, the accuracy of power control related to the battery electrically connected to the power reception device while suppressing the influence of the communication interruption of the wireless communication. Can be improved. Note that the power supply apparatus according to the embodiment can also adopt various aspects similar to the various aspects of the power reception apparatus according to the above-described embodiment.

(Second communication control method)
The second communication control method according to the embodiment can supply power in a non-contact manner to a power receiving device electrically connected to a battery, and can execute wireless communication with the power receiving device. A communication control method in a power supply apparatus, comprising: a communication control step of changing a frequency of wireless communication according to a state of a battery acquired via wireless communication.

  According to the second communication control method according to the embodiment, similarly to the power supply device according to the above-described embodiment, the battery is electrically connected to the power receiving device while suppressing the influence of the communication interruption of the wireless communication. The accuracy of power control can be improved.

(Second computer program)
The second computer program according to the embodiment can supply power to the power receiving device electrically connected to the battery in a contactless manner and can perform wireless communication with the power receiving device. A computer mounted on the apparatus is caused to function as a communication control unit that changes the frequency of wireless communication according to the state of the battery acquired via wireless communication.

  According to the second computer program according to the embodiment, the computer program is read from a recording medium such as a RAM, a CD-ROM, and a DVD-ROM storing the computer program into a computer provided in the power supply apparatus and executed. If this is done, or if the computer program is executed after being downloaded via the communication means, the power supply apparatus according to the above-described embodiment can be realized relatively easily. Thereby, similarly to the power supply device according to the above-described embodiment, it is possible to improve the accuracy of the power control related to the battery electrically connected to the power receiving device while suppressing the influence of the communication interruption of the wireless communication.

  An embodiment according to the non-contact power transmission system of the present invention will be described with reference to the drawings.

(Configuration of contactless power transmission system)
In FIG. 1, a non-contact power transmission system 1 is mounted on a ground-side facility 100 electrically connected to a power supply unit 10 and a vehicle such as a hybrid vehicle or an electric vehicle, and is electrically connected to a vehicle battery 20 of the vehicle. Vehicle-side equipment 200 connected to the vehicle. In FIG. 1, the power supply unit 10 is depicted as a separate member from the ground-side facility 100, but the power supply unit 10 may be a component of the ground-side facility 100.

  The ground-side equipment 100 includes a host microcomputer unit 110 including a memory, a processor, and the like, a communication module unit 120, an antenna unit 121, a power transmission unit 130, and a power transmission coil 140, for example. .

  Here, since various well-known aspects can be applied to the electric circuit related to power transmission including the power transmission unit 130 and the power transmission coil 140, the detailed description thereof is omitted.

  In FIG. 1, the antenna unit 121 and the power transmission coil 140 are drawn outside the broken line indicating the ground side equipment 100, but the antenna unit 121 and the power transmission coil 140 are arranged outside the housing of the ground side equipment 100. It is assumed that the actual device to be used. The same applies to the vehicle-side equipment described later.

  The vehicle-side facility 200 includes a host microcomputer unit 210, a communication module 220, an antenna unit 221, a power receiving unit 230, and a power receiving coil 240. The power receiving unit 230 includes a power receiving unit main body 231 and a voltage / current monitoring unit 232.

  Here, since various known modes can be applied to the electric circuit related to power reception including the power receiving unit 230 and the power receiving coil 240, the detailed description thereof will be omitted. The voltage / current monitoring unit 232 may be configured using a known voltmeter and ammeter, for example.

(Battery charging method)
Next, a method for charging the vehicle battery 20 in the non-contact power transmission system 1 configured as described above will be described with reference to FIG. FIG. 2 is a conceptual diagram of the battery charging method according to the embodiment.

  As shown in the lower part of FIG. 2 (a), the vehicle battery 20 maintains a constant current value until the voltage of the vehicle battery 20 reaches a specified voltage preset by, for example, the manufacturer of the vehicle battery 20, for example. Constant current charging is performed so that electric power is supplied to the battery. On the other hand, after the voltage of the vehicle battery 20 reaches the specified voltage, constant voltage charging is performed in which power is supplied to the vehicle battery 20 while maintaining a constant voltage value. That is, in this embodiment, the vehicle battery 20 is charged by a so-called constant voltage constant current charging method.

  Here, the operation of the non-contact power transmission system 1 during the constant voltage charging period will be described with reference to FIG. FIG. 2B is an enlarged view of a portion surrounded by a circle C in FIG.

  In FIG. 2B, during the period from time t1 to time t2, the voltage value of the vehicle battery 20 rises due to power being transmitted from the power transmission coil 140 to the power reception coil 240. During the period from time t2 to time t3, the voltage value of the vehicle battery 20 naturally decreases due to the power transmission from the power transmission coil 140 to the power reception coil 240 being stopped. During the period from time t3 to time t4, the voltage value of the vehicle battery 20 rises due to power being transmitted again from the power transmission coil 140 to the power reception coil 240.

(Communication between ground side equipment and vehicle side equipment)
Next, a communication interval (that is, communication frequency) of wireless communication performed between the ground-side facility 100 and the vehicle-side facility 200 will be described with reference to the upper part of FIG.

  During the constant current charging period, there is no need to finely adjust the current value supplied to the vehicle battery 20, and the voltage value of the vehicle battery 20 also rises with a constant gradient, so that fluctuations can be easily predicted. Therefore, it is considered that even if the communication interval is set to be relatively long (for example, 1 second), the possibility of affecting the stability of the non-contact power transmission system 1 is low. In addition, it is considered that a communication interruption is acceptable if it is, for example, about several minutes.

  On the other hand, during the constant voltage charging period, it is necessary to adjust the current value relatively frequently so that the voltage value of the vehicle battery 20 becomes the specified voltage. Therefore, it is necessary to shorten the communication interval compared to the constant current charging. In other words, in the constant voltage charging period, it is necessary to increase the communication frequency compared to the constant current charging period. In particular, communication needs to be performed when the current value needs to be adjusted.

  From the above viewpoint, as shown in the upper part of FIG. 2A, in the constant current charging period, communication is performed between the ground side equipment 100 and the vehicle side equipment 200 while being fixed at a relatively long communication interval such as 1 second. Is done. On the other hand, in the constant voltage charging period, for example, it is fixed at a relatively short communication interval such as 10 milliseconds, or as shown in the upper part of FIG. Communication is performed between the ground-side facility 100 and the vehicle-side facility 200 every time the current value needs to be adjusted.

  When an abnormality is detected in at least one of the ground side equipment 100 and the vehicle side equipment 200, communication is immediately performed regardless of the communication interval described above. Moreover, the information exchanged by radio | wireless communication between the ground side equipment 100 and the vehicle side equipment 200 is the charge state of the vehicle battery 20, a required voltage value, a required current value, etc., for example.

  Here, the effect resulting from changing the communication interval (or communication frequency) as described above will be described.

  In the non-contact power transmission system 1, information (for example, the state of the vehicle battery 20, power command value, etc.) relating to the vehicle-side facility 200 (that is, the power receiving side) is transmitted to the ground-side facility 100 (that is, the power transmission side) by wireless communication. The power transmitted to the vehicle-side facility 200 is controlled.

  For this reason, when the communication frequency between the ground side equipment 100 and the vehicle side equipment 200 is relatively high (that is, the communication interval is relatively short), the power control accuracy can be improved. On the other hand, if the communication frequency is relatively high, the stability of the non-contact power transmission system 1 may be reduced when a communication interruption occurs.

  However, in this embodiment, the communication interval is set to be relatively long in the constant current charging period, and the communication interval is set to be relatively short in the constant voltage charging period. In other words, the communication frequency is set to be relatively low during the constant current charging period, and the communication frequency is set to be relatively high during the constant voltage charging period.

  As a result, during the constant current charging period, for example, unintentional charging stop caused by the occurrence of communication interruption can be suitably avoided, and the stability of the non-contact power transmission system 1 can be ensured. In addition, in the constant voltage charging period, the frequency of communication between the ground side equipment 100 and the vehicle side equipment can be increased, the power control accuracy can be improved, and the vehicle battery 20 can be charged safely.

(Charge control process)
Next, the charge control process implemented in the vehicle side equipment 200 of the non-contact power transmission system 1 will be described with reference to the flowchart of FIG.

  In FIG. 3, during the constant current charging period, the host microcomputer unit 210 of the vehicle-side facility 200 acquires a voltage value via the voltage / current monitoring unit 232 (step S <b> 101). Next, the host microcomputer unit 210 transmits a signal indicating the acquired voltage value to the ground-side facility 100 via the communication module unit 220 and the antenna unit 221 (step S102).

  Subsequently, the host microcomputer unit 210 determines whether or not the acquired voltage value has reached a specified voltage related to the vehicle battery 20 (step S103). When it is determined that the acquired voltage value is less than the specified voltage (step S103: No), the host microcomputer unit 210 enters a standby state (step S104), and a predetermined standby time (for example, 1 second) elapses. After that, the process of step S101 is performed.

  On the other hand, when it is determined that the acquired voltage value has reached the specified voltage (step S103: Yes), the host microcomputer unit 210 sends a signal indicating that the constant voltage charging is changed to the constant voltage charging to the communication module unit. It transmits to the ground side equipment 100 via 220 and the antenna part 221 (step S105).

  In parallel with or in parallel with the process of step S105, the host microcomputer unit 210 changes the communication interval (that is, the standby time) so that the communication interval is shorter than the constant current charging period (step). S106).

  Next, the host microcomputer unit 210 acquires a voltage value via the voltage / current monitoring unit 232 (step S107). Subsequently, the host microcomputer unit 210 calculates a current request value according to the acquired voltage value (step S108).

  Next, the host microcomputer unit 210 determines whether or not the current request value has become equal to or less than the specified current value (step S109). Here, the “specified current value” is a value that determines whether or not to end the charging of the vehicle battery 20, and is set in advance as a fixed value or a variable value according to some physical quantity or parameter. It should be noted that various known modes can be applied to the method of setting the specified current value, and therefore the detailed description thereof is omitted.

  When it is determined that the required current value is greater than the specified current value (step S109: No), the host microcomputer unit 210 sends a signal indicating the acquired voltage value and current request value to the communication module unit 220 and the antenna unit 221. To the ground side equipment 100 (step S110). Thereafter, the host microcomputer unit 210 is in a standby state (step S111), and after a predetermined standby time (for example, 10 milliseconds) has elapsed, the process of step S107 is performed.

  When it is determined that the requested current value is equal to or less than the specified current value (step S109: Yes), the host microcomputer unit 210 sends a signal indicating a charge end instruction to the ground side via the communication module unit 220 and the antenna unit 221. It transmits to the equipment 100 (step S112).

  The host microcomputer unit 200 is not limited to the above-described embodiment, and for example, the host microcomputer unit 200 is charged from constant current charging to constant voltage charging based on a battery temperature (see FIG. 1) acquired by a vehicle ECU (Electronic Control Unit) 30. Or the current request value may be calculated. Since various known modes can be applied to the method for estimating the state of the vehicle battery 20 based on the battery temperature, a detailed description thereof is omitted.

  As shown in FIG. 1, the host microcomputer unit 200 is not limited to acquiring the battery temperature via the vehicle ECU 30, and may acquire the battery temperature directly using, for example, a temperature sensor or the like.

  The “ground side equipment 100”, “vehicle side equipment 200”, “communication module section 220”, and “host microcomputer section 220” according to the embodiment are respectively referred to as “power feeding device”, “power receiving device”, “ It is an example of "communication means" and "communication control means".

<First Modification>
A first modification of the contactless power transmission system 1 according to the embodiment will be described. This modification is the same as the above-described embodiment except that a part of the charging control process in the constant voltage charging period is different.

(Charge control process)
The charge control process according to this modification will be described with reference to the flowchart of FIG.

  In FIG. 4, the host microcomputer unit 210 of the vehicle-side facility 200 acquires a voltage value via the voltage / current monitoring unit 232 after the process of step S <b> 105 described above shifts from constant current charging to constant voltage charging. Step S107). Subsequently, the host microcomputer unit 210 calculates a current request value according to the acquired voltage value (step S108).

  Next, the host microcomputer unit 210 compares the current value calculated this time with the current value calculated last time, and determines whether or not the current value has been changed (step S201). When it is determined that the current value has not been changed (step S201: No), the host microcomputer unit 210 performs the process of step S107.

  When it is determined that the current value has been changed (step S201: Yes), the host microcomputer unit 210 determines whether or not the current request value has become equal to or less than the specified current value (step S109). When it is determined that the required current value is greater than the specified current value (step S109: No), the host microcomputer unit 210 sends a signal indicating the acquired voltage value and current request value to the communication module unit 220 and the antenna unit 221. To the ground side equipment 100 (step S110), and the process of step S107 is performed.

  When it is determined that the requested current value is equal to or less than the specified current value (step S109: Yes), the host microcomputer unit 210 sends a signal indicating a charge end instruction to the ground side via the communication module unit 220 and the antenna unit 221. It transmits to the equipment 100 (step S112).

  If comprised in this way, the power control precision in a constant voltage charge period can be improved, reducing unnecessary communication. Since the current value fluctuates relatively frequently in the constant voltage charging period, the communication interval in the constant voltage charging period is shorter than that in the constant current charging period.

<Second Modification>
The 2nd modification of the non-contact electric power transmission system 1 which concerns on an Example is demonstrated. In this modification, instead of the host microcomputer unit 210 of the vehicle-side facility 200, the host microcomputer unit 110 of the ground facility side 100 determines a transition from constant current charging to constant voltage charging.

  Specifically, the host microcomputer unit 110 of the ground-side facility 100 acquires the voltage value measured by the voltage / current monitoring unit 232 of the vehicle-side facility 200 via the antenna unit 121 and the communication module unit 120.

  Next, the host microcomputer unit 110 determines whether or not the acquired voltage value has reached a specified voltage. If it is determined that the acquired voltage value has not reached the specified voltage, the host microcomputer unit 110 enters a standby state, and acquires the voltage value again after a standby time of, for example, 1 second has elapsed.

  On the other hand, when it is determined that the acquired voltage value has reached the specified voltage, the host microcomputer unit 110 sends a signal indicating that the constant voltage charging is changed to the constant voltage charging to the communication module unit 120 and the antenna unit 121. Via the vehicle side equipment 200. In parallel with this processing, the host microcomputer unit 110 changes the standby time so as to be shorter than the standby time in the constant current charging period.

  Thereafter, the host microcomputer unit 110 adjusts the current value supplied to the vehicle battery 20 according to the voltage value acquired via the antenna unit 121 and the communication module unit 120, and the current value is less than or equal to the specified current value. The charge control process is terminated on the condition that it has become.

  The “communication module unit 120” and the “host microcomputer unit 110” according to this modification are other examples of the “communication unit” and the “communication control unit” according to the present invention, respectively.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification. A communication control method, a computer program, and a power supply apparatus are also included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power transmission system, 10 ... Power supply part, 20 ... Vehicle battery, 30 ... Vehicle ECU, 100 ... Ground side equipment, 110, 210 ... Host microcomputer part, 120, 220 ... Communication module part, 121, 221 ... Antenna , 130 ... Power transmission unit, 140 ... Power transmission coil, 200 ... Vehicle side equipment, 230 ... Power reception unit, 231 ... Power reception unit body, 232 ... Voltage / current monitoring unit, 240 ... Power reception coil

Claims (11)

A power receiving device that is capable of receiving power from a power supply device in a contactless manner and is electrically connected to a battery that is charged by a constant current constant voltage method ,
Communication means capable of performing wireless communication with the power supply device;
Depending on the state of the battery , the frequency of the wireless communication is such that the frequency of the wireless communication when the battery is charged with a constant voltage is higher than the frequency of the wireless communication when the battery is charged with a constant current . Communication control means for changing the frequency;
A power receiving device comprising: The power receiving device according to claim 1, wherein the communication control unit changes the frequency of the wireless communication according to a voltage value or a temperature of the battery as a state of the battery. When the battery reaches a specified voltage when the battery is being charged with a constant current , the communication control means shifts from constant current charging to constant voltage charging, and determines the frequency of the wireless communication, The power receiving device according to claim 2, wherein a voltage value of the battery is set higher than before reaching the specified voltage. The communication control unit gradually shifts the frequency of the wireless communication, assuming that the battery voltage value reaches a specified voltage when the battery is being charged with a constant current, and then shifts from constant current charging to constant voltage charging. The power receiving device according to claim 2, wherein the power receiving device is raised. If the temperature of the battery reaches a specified temperature when the battery is charged with a constant current , the communication control means shifts from constant current charging to constant voltage charging. The power receiving device according to claim 2, wherein the temperature of the power is higher than before reaching the specified temperature. The communication control means gradually increases the frequency of the wireless communication, assuming that when the battery is charged with a constant current, the temperature of the battery reaches a specified temperature and then shifts from constant current charging to constant voltage charging. The power receiving device according to claim 2. A communication control method in a power receiving device that can receive power from a power feeding device in a non-contact manner and is electrically connected to a battery that is charged by a constant current constant voltage charging method ,
According to the state of the battery, the power supply device and the power supply device, so that the frequency of the wireless communication when the battery is charged with a constant voltage is higher than the frequency of the wireless communication when the battery is charged with a constant current. A communication control method comprising: a communication control step of changing a frequency of wireless communication performed between the two. Receiving power comprising a communication means capable of receiving power from a power feeding device in a non-contact manner and electrically connected to a battery charged by a constant current constant voltage charging method and capable of performing wireless communication with the power feeding device. The computer installed in the device
Depending on the state of the battery , the frequency of the wireless communication is such that the frequency of the wireless communication when the battery is charged with a constant voltage is higher than the frequency of the wireless communication when the battery is charged with a constant current . A computer program that functions as communication control means for changing the frequency. A power supply device capable of supplying power in a non-contact manner to a power receiving device electrically connected to a battery charged by a constant current constant voltage charging method ,
Communication means capable of performing wireless communication with the power receiving device;
The frequency of the wireless communication when the battery is charged at a constant voltage is higher than the frequency of the wireless communication when the battery is charged at a constant current . Communication control means for changing the frequency of the wireless communication according to a state;
A power supply apparatus comprising: A power feeding device capable of supplying power in a contactless manner to a power receiving device electrically connected to a battery charged by a constant current constant voltage charging method and capable of performing wireless communication with the power receiving device. A communication control method in
The frequency of the wireless communication when the battery is charged at a constant voltage is higher than the frequency of the wireless communication when the battery is charged at a constant current . A communication control method comprising: a communication control step of changing a frequency of the wireless communication according to a state. A power feeding device capable of supplying power in a contactless manner to a power receiving device electrically connected to a battery charged by a constant current constant voltage charging method and capable of performing wireless communication with the power receiving device. The computer installed in
The frequency of the wireless communication when the battery is charged at a constant voltage is higher than the frequency of the wireless communication when the battery is charged at a constant current . A computer program that functions as a communication control unit that changes the frequency of the wireless communication according to a state.

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