POWER RECEPTION EQUIPMENT FOR RESONANCE-TYPE NON-CONTACT POWER SUPPLY SYSTEM

• US 20130057208A1
• Filed: 05/12/2011
• Published: 03/07/2013
• Est. Priority Date: 05/14/2010
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takada, Kazuyoshi, Sakoda, Shimpei, Ichikawa, Shinji, Nakamura, Toru, Suzuki, Sandanori, Yamamoto, Yukihiro
• Granted Patent: US 9,142,972 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• 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 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• 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

Abstract

Power reception equipment (20) is provided with: a secondary side resonance coil (21b) which receives power from a primary side resonance coil (13b) of power supply equipment (10); and a rectifier (23) which rectifies the received power. The power reception equipment is further provided with: a secondary matching unit (22) which is provided between the secondary side resonance coil (21b) and the rectifier (23); a charger (24) to which rectified electric power is supplied; a power storage device (25) which is connected to the charger; and a control unit (26) which adjusts the secondary matching unit when the power storage device is being charged. The control unit stores, as data on a storage device (33), the relationship between the charge power from the power supply equipment during the power ascension phase and the matching status of the secondary matching unit (22) when charging. During the phase in which the power output from the supply equipment is reduced, the control unit adjusts, on the basis of the data stored in the storage device during the power ascension phase, the secondary matching unit (22) so as to reach a suitable status corresponding to the charge power.

Claims

1. Power reception equipment for a resonance type non-contact power supply system, the power reception equipment comprising:

a secondary-side resonance coil, which receives electric power from a primary-side resonance coil possessed by power supply equipment;

a rectifier, which rectifies electric power received by the secondary-side resonance coil;

a secondary matching unit provided between the secondary-side resonance coil and the rectifier;

a charger, to which electric power rectified by the rectifier is supplied;

an electrical storage device connected to the charger; and

a control unit, which adjusts the secondary matching unit when the electrical storage device is being charged, wherein

the control unit is configured to store, in the charging, a relationship between charging power from the power supply equipment during a power ascension phase and a matching state of the secondary matching unit as data in a storage device, and

the control unit is also configured, during a phase in which power output from the power supply equipment falls, to adjust the secondary matching unit to bring the secondary matching unit into a suitable state corresponding to the charging power on the basis of the data that has been stored in the storage device during the power ascension phase.

2. The power reception equipment according to claim 1, wherein the power reception equipment is mounted in a movable body and is used.

3. The power reception equipment according to claim 2, wherein the movable body is an electric vehicle.

4. A resonance type non-contact power supply system comprising the power reception equipment according to claim 1, and power supply equipment,

wherein the power supply equipment is configured to output electric power such that output power from the high-frequency power supply is monotonously increased at the time of the charging operation and the electric power is then monotonously reduced until the charging operation is completed and such that time elapsed from when the charging operation is started until output power reaches a maximum is shorter than time elapsed from when the output power becomes the maximum until the charging operation is stopped.

5. The power reception equipment according to claim 1, wherein the storage device stores data indicative of a relationship between a state of the electrical storage device in which a distance between the primary-side resonance coil and the secondary-side resonance coil is preset and a suitable impedance of the secondary matching unit that corresponds to the state of the electrical storage device.

6. The power reception equipment according to claim 1, wherein the secondary matching unit is a π

-type matching unit comprising two variable capacitors and one inductor.