POWER FEEDING DEVICE AND VEHICLE POWER FEEDING SYSTEM

• US 20120306265A1
• Filed: 02/09/2011
• Published: 12/06/2012
• Est. Priority Date: 02/12/2010
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yamamoto, Yukihiro, Koike, Tsuyoshi
• Application Number:
  US13/578,517
• Publication Number:
  US 20120306265A1
• Time in Patent Office: Days
• US Class Current: 307/9.1
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60M 7/003 for vehicles using stored power (e.g. charging stations)
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/14 Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A power feeding device includes a network analyzer that measures measurement of S-parameters of a resonant system that includes an electromagnetic induction coil and a resonance coil, and an electronic control unit (ECU). The ECU adjusts the resonant frequency of the resonance coils to the power supply frequency in accordance with the measured S-parameters. Specifically, the ECU controls variable capacitors to adjust the resonant frequency of resonance coils and, after adjusting the resonant frequency, controls an impedance matching device to match the input impedance of the resonant system with the impedance on a high-frequency power supply device side viewed from the input port of the resonant system.

Claims

1. A power feeding device that feeds electric power in a non-contact manner to a power receiving device that includes a power receiving coil, the power feeding device comprising:

a power supply device that generates electric power of a prescribed frequency;

a power transmission coil that receives the electric power generated by the power supply device and transmits the electric power to the power receiving coil in a non-contact manner by resonating with the power receiving coil via an electromagnetic field;

a first adjusting device that adjusts the resonant frequency of the power transmission coil;

a second adjusting device that adjusts the input impedance of a resonant system that includes the power transmission coil and the power receiving coil;

a detection device that detects at least one of a transmission characteristic and a reflection characteristic of the resonant system; and

a control device that adjusts the resonant frequency to the prescribed frequency by referring to a result of detection by the detection device and controlling the first adjusting device with a single peak appearing in a frequency spectrum of the at least one of the transmission characteristic and the reflection characteristic, and matches the input impedance of the resonant system with the impedance on the power supply device side viewed from the input port of the resonant system by controlling the second adjusting device.

2. The power feeding device according to claim 1, wherein the control device first adjusts the resonant frequency to the prescribed frequency, and, after the resonant frequency has been adjusted to the prescribed frequency, the control device matches the impedance.

3. The power feeding device according to claim 1, wherein the control device determines whether the distance between the power transmission coil and the power receiving coil is below a prescribed reference value, and adjusts the resonant frequency if the distance between the coils is below the reference value and adjusts the input impedance if it is determined that the distance between the coils is equal to or greater than the reference value.

4. The power feeding device according to claim 1, wherein the first adjusting device includes a variable capacitor that is provided in the power transmission coil.

5. The power feeding device according to claim 1,

wherein the second adjusting device includes an LC circuit that is provided between the power transmission coil and the power supply device, and

the LC circuit includes at least one of a variable capacitor and a variable coil.

6. The power feeding device according to claim 1,

wherein the power transmission coil includes a resonance coil, and an electromagnetic induction coil that is connected to the power supply device and supplies the electric power that is received from the power supply device to the resonance coil by electromagnetic induction, and

the second adjusting device adjusts the input impedance by adjusting the distance between the resonance coil and the electromagnetic induction coil.

7. A vehicle power feeding system comprising:

a power feeding device; and

a vehicle that is supplied with electric power from the power feeding device,

wherein the power feeding device includes a power supply device that generates electric power with a prescribed frequency, a power transmission coil that receives the electric power generated by the power supply device and generates an electromagnetic field that is used to transmit the electric power to the vehicle in a non-contact manner, and a first adjusting device that adjusts the resonant frequency of the power transmission coil, and

the vehicle includes a power receiving coil that receives electric power from the power transmission coil in a non-contact manner by resonating with the power transmission coil of the power feeding device via the electromagnetic field, and a second adjusting device that adjusts the resonant frequency of the power receiving coil, and

wherein the power feeding device further includes a third adjusting device that adjusts the input impedance of a resonant system that includes the power transmission coil and the power receiving coil, a detection device that detects at least one of a transmission characteristic and a reflection characteristic of the resonant system, and a control device that adjusts the resonant frequency of the power transmission coil and the power receiving coil to the prescribed frequency by referring to a result of detection by the detection device and controlling the first and second adjusting devices with a single peak appearing in a frequency spectrum of the at least one of the transmission characteristic and the reflection characteristic, and matches the input impedance of the resonant system with the impedance on the power supply device side viewed from the input port of the resonant system by controlling the third adjusting device.

8. The vehicle power feeding system according to claim 7, wherein the control device first adjusts the resonant frequency to the prescribed frequency, and after the resonant frequency has been adjusted to the prescribed frequency, the control device matches the impedance.

9. The vehicle power feeding system according to claim 7, wherein the control device determines whether the distance between the power transmission coil and the power receiving coil is below a prescribed reference value, and adjusts the resonant frequency if it is determined that the distance between the coils is below the reference value and adjusts the input impedance if it is determined that the distance between the coils is equal to or greater than the reference value.