Power transmitting device and power receiving device

Abstract

To perform an optimal power transmission control in regardless of a combination of a power transmission device and a power reception device or a positional relationship therebetween.SOLUTION: An in-vehicle device 10 includes: a vehicle-side coil 11; a first power conversion circuit 13 that generates a supply power to be supplied to the vehicle-side coil 11 using a power of a secondary battery 17; and a vehicle-side control unit 20 that is configured to be capable of acquiring a terminal voltage Vc of a capacitor 34 charged by the power received by a power supply device 30 and capable of controlling the first power conversion circuit 13, and is capable of executing the power supply control that controls the supply power via the first power conversion circuit 13 so that a terminal voltage Vc becomes a target voltage. The vehicle-side control unit 20 causes the in-vehicle device 10 to transmit predetermined power to the power supply device 30 before the execution of the power supply control, acquires characteristic information of a system for charging the capacitor 34 derived based on a time-series transition of the terminal voltage Vc when a predetermined power is transmitted, and controls the supply power at the time of the power supply control based on the characteristic information.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a power transmitting device and a power receiving device. [Background technology]

[0002] In recent years, research and development has been conducted into charging mobility vehicles equipped with secondary batteries that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy.

[0003] For example, research and development into charging and power supply is being conducted on contactless power transmission, which transmits power between two devices without contact.

[0004] Patent Document 1 describes a power receiving device that receives power transferred from a power transmitting device in a non-contact manner by electromagnetic resonance.

[0005] Patent Document 2 describes a mobile object that can receive power from an externally provided power transmission device in a non-contact manner.

[0006] Patent Document 3 describes a wireless charging receiving end that includes a receiver coil, a compensation network, a power converter, and a receiving end controller.

[0007] Patent Document 4 describes a contactless power supply device including a power supply device that includes an inverter, a primary coil, and a power supply side resonant circuit provided between the inverter and the primary coil, and a power receiving device that includes a secondary coil that is magnetically coupled to the primary coil and acquires energy from the primary coil, and converts the energy acquired by the secondary coil into voltage to generate output power. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-005615 [Patent Document 2] Japanese Patent Publication No. 2023-20323 [Patent Document 3] Special Publication No. 2023-500133 [Patent Document 4] International Publication No. 2015 / 104779 Summary of the Invention [Problem to be solved by the invention]

[0009] The technology disclosed herein aims to perform optimal power transmission control regardless of the combination of power transmitting devices and power receiving devices, their relative positions, and the like. [Means for solving the problem]

[0010] a power conversion unit that generates supply power to be supplied to the power transmission unit using power from a first power supply unit and supplies the supply power to the power transmission unit; and a control unit that is configured to acquire a terminal voltage of a second power supply unit that is charged by the power received by the power receiving device and to be able to control the power conversion unit, and that is able to execute power supply control that controls the supply power via the power conversion unit so that the terminal voltage becomes a target voltage, wherein the control unit causes the power transmission device to transmit a predetermined power to the power receiving device before executing the power supply control, acquires characteristic information of a system that charges the second power supply unit derived based on a time-series transition of the terminal voltage when the predetermined power is transmitted, and controls the supply power during the power supply control based on the acquired characteristic information. the characteristic information includes transfer function information relating to a transfer function of the system, and the control unit controls the supply power during the power supply control based on the transfer function information. It is something.

[0011] A power receiving device according to one aspect of the present disclosure includes a power receiving unit that receives power transmitted from a power transmitting device via contactless power transmission, a power receiving-side power supply unit that is configured to be chargeable with the power received by the power receiving unit and to be able to supply the stored power to a load, and a control unit, wherein the power transmitting device is capable of performing power feeding control that controls power supplied from the power transmitting device to the power receiving device so that a terminal voltage of the power receiving-side power supply unit becomes a target voltage, and the control unit acquires characteristic information of a system that charges the power receiving-side power supply unit based on a time-series transition of the terminal voltage when a predetermined power is transmitted from the power transmitting device to the power receiving device before the power transmitting device performs the power feeding control, and performs control to transmit the characteristic information to the power transmitting device, and the power transmitting device controls the supply power during the power feeding control based on the characteristic information. , the characteristic information includes transfer function information regarding a transfer function of the system; It is something. [Effects of the Invention]

[0012] According to the technology of the present disclosure, optimal power transmission control can be performed regardless of the combination of power transmitting devices and power receiving devices, their relative positions, and the like. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a contactless power transmission system 100 according to an embodiment of the disclosed technique. [Figure 2] FIG. 2 is a schematic diagram illustrating the operating state of the contactless power transfer system 100 while the in-vehicle device 10 is executing power supply control. [Figure 3] FIG. 3 is a schematic diagram illustrating the operating state of the contactless power transfer system 100 during execution of the compensator setting control. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1 is a schematic diagram showing a contactless power transfer system 100 according to an embodiment of the technology of the present disclosure. The contactless power transfer system 100 includes an on-board device 10 mounted on a vehicle or the like, and a power supply device 30 installed in a parking lot, a facility, a house, or the like. The contactless power transfer system 100 is configured to enable first power transfer from the on-board device 10 to the power supply device 30. The on-board device 10 and the power supply device 30 transfer power contactlessly using magnetic coupling between coils, for example, using a magnetic field resonance method or an electromagnetic induction method.

[0015] The vehicle on which the in-vehicle device 10 is mounted includes a secondary battery 17 (denoted as BAT in the drawing) such as a lithium ion battery or a nickel-metal hydride battery, and an electric motor as a drive source that is driven using the power of the secondary battery 17. This vehicle is, for example, an automobile having drive wheels driven by the power of the electric motor and wheels including steerable wheels (neither of which is shown).

[0016] The vehicle-mounted device 10 includes a vehicle-side coil 11, a resonant circuit 12 connected to the vehicle-side coil 11, a first power conversion circuit 13 connected to the resonant circuit 12, a filter 14 provided between the first power conversion circuit 13 and a secondary battery 17, a first communication unit 18, and a vehicle-side control unit 20.

[0017] The resonant circuit 12 includes, for example, a capacitor connected in series to the vehicle-side coil 11. During the first power transmission, the vehicle-side coil 11 and the resonant circuit 12 form a power transmission unit that transmits power to the power supply device 30 by contactless power transmission.

[0018] During the first power transmission, the first power conversion circuit 13 uses power from the secondary battery 17 to generate supply power to be supplied to the vehicle-side coil 11 and the resonant circuit 12, and supplies this supply power to the vehicle-side coil 11 and the resonant circuit 12. The first power conversion circuit 13 includes switching elements such as transistors, and during the first power transmission, it operates, for example, as an inverter that converts direct current supplied from the secondary battery 17 into high-frequency alternating current. The high-frequency alternating current converted by the first power conversion circuit 13 is input to the vehicle-side coil 11, and high-frequency alternating current is induced by electromagnetic induction in the power supply-side coil 31 of the power supply device 30 that faces the vehicle-side coil 11 with a gap therebetween.

[0019] A filter 14 is provided to stabilize the power and remove noise.

[0020] The first communication unit 18 is an interface for performing short-distance wireless communication, which can be achieved using, for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark).

[0021] The vehicle-side control unit 20 includes a processor such as a CPU (Central Processing Unit) and a memory, and performs various controls related to power transmission.

[0022] The power supply device 30 includes a power supply side coil 31, a resonant circuit 32 connected to the power supply side coil 31, a second power conversion circuit 33 connected to the resonant circuit 32, a capacitor 34 connected to the second power conversion circuit 33, a voltage detection circuit 35 that detects the terminal voltage Vc of the capacitor 34, a third power conversion circuit 36 ​​connected to the capacitor 34, a second communication unit 37, and a power supply side control unit 40.

[0023] The resonant circuit 32 includes, for example, a capacitor connected in series to the power supply side coil 31. During the first power transmission, the power supply side coil 31 and the resonant circuit 32 form a power receiving unit that receives power transmitted from the in-vehicle device 10 by contactless power transmission.

[0024] The second power conversion circuit 33 operates as a rectifier during the first power transmission, and converts the high-frequency AC input from the power supply side coil 31 into DC.

[0025] The capacitor 34 is charged by the direct current converted by the second power conversion circuit 33. During the first power transmission, the capacitor 34 is configured to be able to supply the stored power to a load connected to the third power conversion circuit 36.

[0026] The third power conversion circuit 36 ​​operates as an inverter during the first power transmission, converting the DC discharged from the capacitor 34 into AC at the frequency of the commercial power supply. The AC at the commercial frequency converted by the third power conversion circuit 36 ​​is supplied to a power distribution network or a load such as a home appliance.

[0027] The second communication unit 37 is an interface for performing short-distance wireless communication, which can be achieved using, for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark).

[0028] The power supply side control unit 40 includes a processor such as a CPU (Central Processing Unit) and a memory, and performs overall control of the power supply device 30.

[0029] During the first power transmission, the vehicle-side control unit 20 acquires the terminal voltage Vc of the capacitor 34 of the power supply device 30, and performs power supply control to control the supply power supplied to the vehicle-side coil 11 and the resonant circuit 12 via the first power conversion circuit 13 so that this terminal voltage Vc becomes a predetermined target voltage.

[0030] In this way, the vehicle-side control unit 20 controls (feedback control) the input power of the control object, which is a system that charges the capacitor 34 with power transmitted from the in-vehicle device 10 (a charging system including the resonant circuit 12, the vehicle-side coil 11, the power supply-side coil 31, the resonant circuit 32, and the second power conversion circuit 33, which are provided between the first power conversion circuit 13 and the capacitor 34). The output voltage (synonymous with the terminal voltage Vc) of the control object is set to a target voltage. Hereinafter, the transfer function of the control object will be referred to as transfer function G(s).

[0031] 2 is a schematic diagram illustrating the operating state of the contactless power transfer system 100 while the in-vehicle device 10 is performing power supply control. When the power supply control is started, the power supply-side control unit 40 acquires the terminal voltage Vc from the voltage detection circuit 35 and performs control to transmit the acquired terminal voltage Vc from the second communication unit 37 to the in-vehicle device 10. The terminal voltage Vc transmitted from the second communication unit 37 is received by the first communication unit 18 and acquired by the vehicle-side control unit 20.

[0032] 2, the vehicle-side control unit 20 includes a comparator 21, a compensator 22, a pulse generating unit 23, and a compensator setting unit 24. These are configured by hardware, software, or a combination thereof. The comparator 21 compares the terminal voltage Vc acquired via the first communication unit 18 with a target voltage, and outputs the deviation.

[0033] The compensator 22 determines the input power to the controlled object required to optimize the output of the controlled object represented by the transfer function G(s) (to achieve a state with good responsiveness and no oscillation) based on the deviation input from the comparator 21 and various setting values ​​set by the compensator setting unit 24 (for example, information on the P term, I term, and D term in the case of a PID compensator).

[0034] Specifically, the compensator 22 determines the input power to the controlled object so that the phase margin between the input and output of the controlled object is equal to or greater than 0 degrees. The pulse generator 23 generates a drive pulse and supplies it to the first power converter circuit 13 so that the power output from the first power converter circuit 13 becomes the input power determined by the compensator 22.

[0035] The compensator setting unit 24 determines a setting value for the compensator 22 such that the phase margin between the input and output of the controlled object is 0 degrees or more, and sets the determined setting value in the compensator 22. If the values ​​(frequencies) of the poles and zeros in the transfer function G(s) are determined, the setting value for the compensator 22 such that the phase margin between the input and output of the controlled object is 0 degrees or more can be determined based on those values.

[0036] However, the transfer function G(s) can vary in various ways depending on the combination of the on-vehicle device 10 and the power supply device 30, the positional relationship between the vehicle-side coil 11 and the power supply-side coil 31, etc. Therefore, in this embodiment, by using the output of the controlled object when the controlled object is operated under specific conditions, it is possible to set an appropriate setting value in the compensator 22 according to the combination of the on-vehicle device 10 and the power supply device 30, and the positional relationship between the vehicle-side coil 11 and the power supply-side coil 31.

[0037] Before the above-mentioned power supply control is executed, i.e., before the comparator 21 and the compensator 22 determine the power to be supplied to the vehicle-side coil 11 and the resonant circuit 12, the vehicle-side control unit 20 generates a drive pulse of a predetermined pattern (a pattern with fixed pulse width and frequency) using the pulse generation unit 23, and controls the first power conversion circuit 13 according to this drive pulse, thereby executing compensator setting control to control the power supplied to the vehicle-side coil 11 and the resonant circuit 12 to a predetermined power (constant value).

[0038] FIG. 3 is a schematic diagram illustrating the operating state of the contactless power transfer system 100 during execution of compensator setting control. Before starting the compensator setting control, the vehicle-side control unit 20 transmits trigger information to the power supply device 30 via the first communication unit 18. When the power supply-side control unit 40 acquires the trigger information via the second communication unit 37, it starts recording the terminal voltage Vc detected by the voltage detection circuit 35 in memory. After transmitting the trigger information, the vehicle-side control unit 20 starts the compensator setting control and transmits timing information indicating the timing at which the compensator setting control started to the power supply device 30 via the first communication unit 18. When the compensator setting control starts, a constant amount of power is transmitted from the in-vehicle device 10 to the power supply device 30, and this power charges the capacitor 34, causing the terminal voltage Vc to increase. The time series transition of this terminal voltage Vc is then recorded in the memory of the power supply-side control unit 40.

[0039] The power supply side control unit 40 includes a transfer function derivation unit 41 and a characteristic information derivation unit 42. The transfer function derivation unit 41 acquires power supply circuit information related to circuit elements included in the power supply device 30 among the above-mentioned controlled objects, which is stored in memory. The transfer function derivation unit 41 acquires vehicle circuit information related to circuit elements included in the above-mentioned controlled objects, which are included in the on-board device 10, from the on-board device 10 via the second communication unit 37. The power supply circuit information and the vehicle circuit information are each information on circuit elements related to the transfer function of the above-mentioned controlled object, such as the number and connection relationships of capacitors, coils, and resistors, and the values ​​of each circuit element.

[0040] The transfer function derivation unit 41 derives the transfer function G(s) of the controlled object based on the power supply circuit information and vehicle circuit information, with the coefficients being unknown. From this transfer function G(s), the number of poles and the number of zeros can be determined. Note that the number of poles and zeros in the transfer function G(s) can change depending on the combination of the power supply circuit information and the vehicle circuit information.

[0041] The characteristic information derivation unit 42 identifies the terminal voltage Vc at the time the compensator setting control is initiated from among the terminal voltages Vc stored in the memory, in accordance with the timing information and trigger information acquired from the in-vehicle device 10. The characteristic information derivation unit 42 derives coefficients of the transfer function G(s) from the relationship between the terminal voltage Vc values ​​at each predetermined time interval starting from the detection time of the identified terminal voltage Vc and the transfer function G(s) derived by the transfer function derivation unit 41, and derives the pole values ​​(frequencies) and zero values ​​(frequencies) of the transfer function G(s) from the transfer function G(s) having the derived coefficients. The pole values ​​(frequencies) and zero values ​​(frequencies) of the transfer function G(s) are referred to as characteristic information of the transfer function G(s). The characteristic information derivation unit 42 transmits the derived characteristic information to the in-vehicle device 10 via the second communication unit 37.

[0042] In the in-vehicle device 10, the vehicle-side control unit 20 acquires the characteristic information derived by the power supply device 30 via the first communication unit 18. The vehicle-side control unit 20 inputs the acquired characteristic information to the compensator setting unit 24. Based on the input characteristic information, the compensator setting unit 24 sets the compensator 22 to optimize the output of the controlled object (to make the phase margin 0 degrees or more). After setting the setting value of the compensator 22 is completed, the vehicle-side control unit 20 starts the above-mentioned power supply control.

[0043] As described above, according to the contactless power transfer system 100, the supply power during power transfer control is controlled based on characteristic information acquired based on the time-series transition of the terminal voltage of the capacitor 34 when a predetermined power is transferred from the in-vehicle device 10 to the power supply device 30 before the start of power transfer control. This makes it possible to perform optimal power transfer control regardless of the combination of the in-vehicle device 10 and the power supply device 30, the positional relationship between the vehicle-side coil 11 and the power supply-side coil 31, etc.

[0044] In the above description, the power supply device 30 derives the characteristic information of the transfer function G(s) of the controlled object based on the time-series transition of the terminal voltage Vc during the compensator setting control. However, it is also possible for the vehicle-side control unit 20 to derive this characteristic information.

[0045] In this case, the vehicle-side control unit 20 acquires power supply circuit information from the power supply device 30 and derives the transfer function G(s) based on this power supply circuit information and vehicle circuit information of the host vehicle. When the power supply-side control unit 40 of the power supply device 30 receives trigger information from the in-vehicle device 10, it starts recording the terminal voltage Vc, and after recording the terminal voltage Vc for a certain period of time, it transmits the terminal voltage Vc data to the in-vehicle device 10. The vehicle-side control unit 20 acquires this data and derives characteristic information of the transfer function G(s) based on this data and the transfer function G(s) derived as described above. With the above configuration, the cost and processing load of the power supply device 30 can be reduced.

[0046] This specification describes at least the following items. Note that the components in parentheses correspond to those in the above-described embodiment, but are not limited to these.

[0047] (1) a power transmission unit (a vehicle-side coil 11 and a resonant circuit 12) that transmits power to a power receiving device (a power supply device 30) by non-contact power transmission; a power conversion unit (first power conversion circuit 13) that generates supply power to be supplied to the power transmission unit using power from a first power supply unit (secondary battery 17) and supplies the supply power to the power transmission unit; a control unit (vehicle-side control unit 20) configured to acquire a terminal voltage (terminal voltage Vc) of a second power supply unit (capacitor 34) charged by the power received by the power receiving device and to control the power conversion unit, and to execute power supply control to control the supplied power via the power conversion unit so that the terminal voltage becomes a target voltage; Equipped with The control unit Before the power supply control is performed, a predetermined power is transmitted from the power transmitting device to the power receiving device, and characteristic information of a system for charging the second power supply unit is acquired based on a time-series transition of the terminal voltage when the predetermined power is transmitted; controlling the supply power during the power supply control based on the acquired characteristic information; Power transmission device (on-vehicle device 10).

[0048] According to (1), the supply power during the power supply control is controlled based on characteristic information acquired based on the time-series transition of the terminal voltage of the second power supply unit when a predetermined power is transmitted from the power transmitting device to the power receiving device before the start of the power supply control. This makes it possible to control the supply power taking into account the combination of the circuit configurations of the power transmitting device and the power receiving device and their relative positions. As a result, optimal power transmission control is possible regardless of the combination of the power transmitting device and the power receiving device or their relative positions.

[0049] (2) The power transmission device according to (1), the characteristic information includes transfer function information relating to a transfer function of the system; the control unit controls the supply power during the power supply control based on the transfer function information. Power transmission equipment.

[0050] According to (2), the power supply control is performed based on the transfer function information obtained by transmitting a predetermined power before the power supply control, so that the power supply control can be performed appropriately.

[0051] (3) The power transmitting device according to (2), the transfer function information is information indicating poles and zeros of the transfer function, the control unit controls the supplied power based on the information indicating the poles and zeros so that a phase margin is equal to or greater than 0 degrees. Power transmission equipment.

[0052] According to (3), power supply control can be appropriately performed.

[0053] (4) The power transmitting device according to (3), The control unit acquires information indicating the poles and zeros derived by the power receiving device based on a time series transition of the terminal voltage when the predetermined power is transmitted from the power transmitting device to the power receiving device by receiving the information from the power receiving device. Power transmission equipment.

[0054] According to (4), since there is no need to derive poles and zeros on the power transmission device side, it is possible to reduce manufacturing costs and reduce the load during operation.

[0055] (5) The power transmitting device according to (3), the control unit derives the poles and zeros based on a time series transition of the terminal voltage when the predetermined power is transmitted from the power transmitting device to the power receiving device, thereby acquiring information indicating the poles and zeros. Power transmission equipment.

[0056] According to (5), since there is no need to derive poles and zeros on the power receiving device side, it is possible to reduce the manufacturing cost of the power receiving device and reduce the load on the power receiving device during operation.

[0057] (6) The power transmitting device according to any one of (1) to (5), The predetermined power is a constant power. Power transmission equipment.

[0058] According to (6), characteristic information can be derived easily and accurately.

[0059] (7) The power transmitting device according to any one of (1) to (6), The power transmission device is provided in a vehicle including an electric motor as a drive source driven by the electric power of the first power supply unit. Power transmission equipment.

[0060] According to (7), power can be sent from the vehicle to a load connected to the power receiving device, making it possible to effectively utilize the vehicle's surplus power and to utilize vehicle power in the event of a disaster.

[0061] (8) a power receiving unit (a power supply side coil 31 and a resonant circuit 32) that receives power transmitted from a power transmitting device (an in-vehicle device 10) by contactless power transmission; a power receiving side power supply unit (capacitor 34) that can be charged with the power received by the power receiving unit and can supply the stored power to a load; a control unit (power supply side control unit 40), the power transmitting device is capable of performing power supply control to control power supplied from the power transmitting device to the power receiving device so that a terminal voltage (terminal voltage Vc) of the power receiving side power supply unit becomes a target voltage; the control unit acquires characteristic information of a system that charges the power receiving-side power supply unit based on a time-series transition of the terminal voltage when a predetermined power is transmitted from the power transmitting device to the power receiving device before the power transmitting device performs the power supply control, and performs control to transmit the characteristic information to the power transmitting device; In the power transmitting device, the supply power is controlled during the power supply control based on the characteristic information. Power receiving device (power supply device 30).

[0062] According to (8), the power transmission device controls the supply power during power supply control based on characteristic information acquired based on the time-series transition of the terminal voltage of the power receiving side power supply unit when a predetermined power is transmitted from the power transmission device to the power receiving device before the start of power supply control. This makes it possible to control the supply power taking into account the combination of the circuit configurations of the power transmission device and the power receiving device and their relative positions. As a result, optimal power transmission control is possible regardless of the combination of the power transmission device and the power receiving device or their relative positions.

[0063] (9) (8) The power receiving device according to the present invention, the characteristic information includes transfer function information relating to a transfer function of the system; Power receiving device.

[0064] (10) (9) The power receiving device according to the present invention, The transfer function information is information indicating poles and zeros of the system. Power receiving device. [Explanation of symbols]

[0065] 10 Onboard equipment 11 Vehicle side coil 12,32 resonant circuit 13 First power conversion circuit 14 Filters 17 Secondary battery 18 First Communications Department 20 Vehicle side control unit 21 Comparator 22 Compensator 23 Pulse generation unit 24 Compensator setting section 30 Power supply 31 Power supply coil 33 Second power conversion circuit 34 Capacitor 35 Voltage detection circuit 36 Third power conversion circuit 37 Second Communications Department 40 Power supply side control unit 41 Transfer function derivation section 42 Characteristic information derivation unit 100 Contactless power transmission system

Claims

1. a power transmission unit that transmits power to the power receiving device by contactless power transmission; a power conversion unit that generates supply power to be supplied to the power transmission unit using power from a first power supply unit and supplies the supply power to the power transmission unit; a control unit configured to acquire a terminal voltage of a second power supply unit that is charged by the power received by the power receiving device and to control the power conversion unit, and to execute power supply control that controls the supplied power via the power conversion unit so that the terminal voltage becomes a target voltage; Equipped with The control unit Before the power supply control is performed, a predetermined power is transmitted from the power transmitting unit to the power receiving device, and characteristic information of a system that charges the second power supply unit is acquired based on a time-series transition of the terminal voltage when the predetermined power is transmitted; controlling the supply power during the power supply control based on the acquired characteristic information; the characteristic information includes transfer function information relating to a transfer function of the system; The control unit controls the supply power during the power supply control based on the transfer function information. Power transmission equipment.

2. The power transmitting device according to claim 1 , the transfer function information is information indicating poles and zeros of the transfer function, the control unit controls the supplied power based on the information indicating the poles and zeros so that a phase margin is equal to or greater than 0 degrees. Power transmission equipment.

3. The power transmitting device according to claim 2, The control unit acquires information indicating the poles and zeros derived by the power receiving device based on a time-series transition of the terminal voltage when the predetermined power is transmitted from the power transmitting device to the power receiving device by receiving the information from the power receiving device. Power transmission equipment.

4. The power transmitting device according to claim 2, the control unit derives the poles and zeros based on a time series transition of the terminal voltage when the predetermined power is transmitted from the power transmitting device to the power receiving device, thereby acquiring information indicating the poles and zeros. Power transmission equipment.

5. The power transmitting device according to any one of claims 1 to 4, The predetermined power is a constant power. Power transmission equipment.

6. The power transmitting device according to any one of claims 1 to 4, the power transmission device is provided in a vehicle including an electric motor as a drive source driven by the electric power of the first power supply unit, Power transmission equipment.

7. a power receiving unit that receives power transmitted from the power transmitting device by wireless power transmission; a power receiving side power supply unit configured to be charged by the power received by the power receiving unit and to supply the stored power to a load; a control unit, the power transmission device is capable of performing power supply control to control power supplied from the power transmission device to the power receiving unit so that a terminal voltage of the power receiving-side power supply unit becomes a target voltage; the control unit acquires characteristic information of a system that charges the power receiving-side power supply unit based on a time-series transition of the terminal voltage when a predetermined power is transmitted from the power transmitting device to the power receiving unit before the power transmitting device performs the power supply control, and performs control to transmit the characteristic information to the power transmitting device; In the power transmission device, the supply power is controlled based on the characteristic information during the power supply control; the characteristic information includes transfer function information regarding a transfer function of the system; Power receiving device.

8. The power receiving device according to claim 7, The transfer function information is information indicating poles and zeros of the system. Power receiving device.

Images