Power transmitting device and power receiving device

Abstract

To perform an optimal power transmission control regardless of a combination of a power transmission device and a power reception device.SOLUTION: An in-vehicle device 10 comprises: 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 part 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 a 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 acquires characteristic information of a system for charging the capacitor 34 from the in-vehicle device 10 before executing the power supply control, 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.

[0008] Patent Document 5 describes suppressing impedance mismatch between a charging station and a vehicle in a contactless power transfer system that transfers power from a charging station to a vehicle in a contactless manner. [Prior art documents] [Patent documents]

[0009] [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 [Patent Document 5] Japanese Patent Application Laid-Open No. 2015-109769 Summary of the Invention [Problem to be solved by the invention]

[0010] The technology of the present disclosure aims to perform optimal power transmission control regardless of the combination of a power transmitting device and a power receiving device. [Means for solving the problem]

[0011] A power transmission device according to one aspect of the present disclosure includes a power transmission unit that transmits power to a 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; 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, and the control unit acquires characteristic information of a system that charges the second power supply unit from the power receiving device before executing the power supply control, 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.

[0012] 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 unit 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 corresponding to the power transmitting 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]

[0013] According to the technology of the present disclosure, it is possible to perform optimal power transmission control regardless of the combination of the power transmitting device and the power receiving device. [Brief explanation of the drawings]

[0014] [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

[0015] 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.

[0016] 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).

[0017] 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.

[0018] 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.

[0019] 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.

[0020] A filter 14 is provided to stabilize the power and remove noise.

[0021] 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).

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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).

[0029] 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.

[0030] 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.

[0031] 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).

[0032] 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.

[0033] 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.

[0034] 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).

[0035] 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.

[0036] The compensator setting unit 24 determines the setting value of the compensator 22 so 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 of the compensator 22 so 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. The values ​​of the poles and zeros of the transfer function G(s) are referred to as characteristic information of the transfer function G(s).

[0037] However, the transfer function G(s) can vary depending on the combination of the in-vehicle device 10 and the power supply device 30. Therefore, in this embodiment, characteristic information of the transfer function G(s) corresponding to each model of the in-vehicle device 10 is pre-recorded in a memory included in the power supply side control unit 40 of the power supply device 30. This memory stores individual characteristic information for each model of the in-vehicle device 10, such as characteristic information for when power is transferred with model A and characteristics for when power is transferred with model B, for example.

[0038] 3 is a schematic diagram illustrating the operating state of the contactless power transfer system 100 before the start of power supply control. Before the above-described 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 transmits model information of its own device to the power supply device 30 via the first communication unit 18. Upon acquiring this model information, the characteristic information derivation unit 42 of the power supply-side control unit 40 acquires characteristic information corresponding to this model information from the memory 41 and transmits this characteristic information to the in-vehicle device 10 via the second communication unit 37.

[0039] The vehicle-side control unit 20 inputs the characteristic information acquired from the power supply device 30 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 (so that the phase margin is 0 degrees or more). After setting the setting value of the compensator 22, the vehicle-side control unit 20 starts the above-mentioned power supply control.

[0040] As described above, according to the contactless power transfer system 100, before power supply control begins, characteristic information of the transfer function G(s) determined by the combination of the power supply device 30 and the in-vehicle device 10 is transmitted from the power supply device 30 to the in-vehicle device 10. Then, the in-vehicle device 10 controls the supply power during power supply control based on this characteristic information. Therefore, optimal power transmission control is possible regardless of the combination of the in-vehicle device 10 and the power supply device 30.

[0041] Even when the combination of the power supply device 30 and a specific model of the in-vehicle device 10 is determined, the transfer function G(s) may change during execution of power supply control. For example, if the target value of the current output to the load changes, or if the external environment such as temperature changes, the values ​​of the poles and zeros of the transfer function G(s) may change.

[0042] Therefore, it is preferable to store a plurality of pieces of characteristic information corresponding to, for example, the output current value to the load or the magnitude of the external temperature in the memory 41 of the power supply side control unit 40. In this case, a plurality of pieces of characteristic information corresponding to a plurality of ranges of the output current value or the external temperature are stored in the memory 41 of the power supply side control unit 40 for each model of the in-vehicle device 10. For example, for a certain model, range IA and range IB are set as the ranges of the output current value or the external temperature, and characteristic information corresponding to each range is stored.

[0043] Before starting power supply control, the power supply side control unit 40 transmits to the in-vehicle device 10 any one of a plurality of pieces of characteristic information corresponding to the model information acquired from the in-vehicle device 10 (for example, information corresponding to the above range IA).

[0044] Then, when the output current value to the load changes to the above range IB after the start of power supply control, the power supply side control unit 40 acquires characteristic information corresponding to this range IB from the memory and transmits the acquired characteristic information to the in-vehicle device 10.

[0045] After starting power supply control, the vehicle-side control unit 20 acquires characteristic information from the power supply device 30 and inputs the characteristic information to the compensator setting unit 24. Based on the input characteristic information, the compensator setting unit 24 resets the compensator 22 to optimize the output of the controlled object.

[0046] In this way, even after the start of power supply control, the setting of the compensator 22 can be appropriately changed according to the state of the charging system, thereby enabling power supply control to be performed more quickly and stably.

[0047] 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.

[0048] (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 acquiring characteristic information of a system that charges the second power supply unit from the power receiving device before executing the power supply control; controlling the supply power during the power supply control based on the acquired characteristic information; Power transmission device (vehicle-mounted device 10).

[0049] According to (1), characteristic information is transmitted from the power receiving device to the power transmitting device before the start of power supply control, and the supplied power during power supply control is controlled based on this characteristic information. This enables optimal power transmission control between power receiving devices with various circuit configurations.

[0050] (2) The power transmission device according to (1), The control unit further acquiring, from the power receiving device, the characteristic information corresponding to a current state of the system during execution of the power supply control; controlling the supply power during the power supply control based on the acquired characteristic information; Power transmission equipment.

[0051] According to (2), after the start of power supply control, characteristic information is transmitted from the power receiving device to the power transmitting device, and the power supply control during power supply control is performed based on this characteristic information. This enables optimal power transmission control that takes into account changes in the transfer function of the controlled object (such as deviations of poles and zeros) that may occur due to fluctuations in the external environment, such as temperature.

[0052] (3) The power transmission device according to (1) or (2), 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.

[0053] According to (3), the power supply control is performed based on the transfer function information, so that the power supply control can be performed appropriately.

[0054] (4) The power transmitting device according to (3), 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.

[0055] According to (4), power supply control can be appropriately performed.

[0056] (5) The power transmission device according to any one of (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.

[0057] According to (5), 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.

[0058] (6) 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, corresponding to the power transmitting 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 based on the characteristic information during the power supply control. Power receiving device (power supply device 30).

[0059] According to (6), characteristic information is transmitted to the power transmitting device before the start of power supply control, and the power transmitting device controls the supply power during power supply control based on the characteristic information. 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. As a result, optimal power transmission control is possible regardless of the combination of the power transmitting device and the power receiving device.

[0060] (7) (6) The power receiving device according to the present invention, The control unit further acquiring the characteristic information according to a current state of the system during execution of the power supply control by the power transmitting device, and transmitting the characteristic information to the power transmitting device; In the power transmitting device, the supply power is controlled based on the characteristic information during the power supply control. Power transmission equipment.

[0061] According to (7), after the start of power supply control, characteristic information according to the system state is transmitted to the power transmitting device, and the power supply control during power supply control is performed based on this characteristic information. This enables optimal power transmission control that takes into account changes in the transfer function that may occur due to changes in the output current value to the load, etc.

[0062] (8) (7) 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.

[0063] (9) (8) 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]

[0064] 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 memory 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, characteristic information of a system that charges the second power supply unit is acquired from the power receiving device; 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 control unit further acquiring, from the power receiving device, the characteristic information corresponding to a current state of the system during execution of the power supply control; controlling the supply power during the power supply control based on the acquired characteristic information; Power transmission equipment.

3. 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.

4. The power transmitting device according to claim 3, 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.

5. 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, corresponding to the power transmission device, before the power transmission device performs the power supply control, and performs control to transmit the characteristic information to the power transmission 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.

6. The power receiving device according to claim 5, The control unit further acquiring the characteristic information according to a current state of the system during execution of the power supply control by the power transmitting device, and transmitting 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. Power receiving device.

7. The power receiving device according to claim 5, The transfer function information is information indicating poles and zeros of the system. Power receiving device.

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