Resonance type non-contact charging device

• US 8,421,410 B2
• Filed: 06/08/2012
• Issued: 04/16/2013
• Est. Priority Date: 12/24/2008
• 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, Suzuki, Sadanori, Nakata, Kenichi, Sakoda, Shimpei, Yamamoto, Yukihiro, Ichikawa, Shinji, Ishikawa, Tetsuhiro
• Primary Examiner(s): Muralidar, Richard V
• Application Number:
  US13/492,317
• Publication Number:
  US 20120242286A1
• Time in Patent Office: 312 Days
• Field of Search: 320/108, 320/109, 180/65.1, 180/65.21, 180/65.27, 180/65.29, 180/65.31, 191/10, 455/41.1, 903/907
• US Class Current: 320/108
• 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: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A resonance type non-contact charging device includes a high frequency power source, a primary side resonant coil, a secondary side resonant coil, a charger, a secondary battery, and a stop control unit. The primary side resonant coil receives supply of high frequency electric power from the high frequency power source. The secondary side resonant coil is arranged apart from the primary side resonant coil in a non-contact manner. The secondary side resonant coil receives electric power from the primary side resonant coil through magnetic field resonance between the primary side resonant coil and the secondary side resonant coil. The charger receives supply of high frequency electric power from the secondary side resonant coil. The secondary battery is connected to the charger. The stop control unit stops the high frequency power source before stopping the charger when charging is to be stopped.

Claims

1. A non-contact power transmission device that transmits electric power to a power reception device having a secondary side coil and a charger receiving electric power received at the secondary side coil, the non-contact power transmission device comprising:

a primary side coil configured to receive electric power from a power source and transmit the electric power to the secondary side coil through a magnetic field; and

a control unit configured to stop the power source before the charger is stopped when charging is to be stopped.

2. The non-contact power transmission device according to claim 1, wherein when charging is to be stopped, the control unit stops the power source a predetermined time before the charger is stopped.

3. The non-contact power transmission device according to claim 1, wherein the primary side coil is installed ground side.

4. The non-contact power transmission device according to claim 3, wherein a central axis of the primary side coil is orthogonal to a surface of the ground.

5. The non-contact power transmission device according to claim 3, wherein the primary side coil is embedded in a floor.

6. The non-contact power transmission device according to claim 1, wherein the primary side coil is formed of a copper wire.

7. The non-contact power transmission device according to claim 1, wherein the primary side coil is wound in a helical form.

8. The non-contact power transmission device according to claim 3, wherein the primary side coil is wound in a helical form.

9. The non-contact power transmission device according to claim 8, wherein a central axis of the primary side coil is orthogonal to a surface of the ground.

10. The non-contact power transmission device according to claim 1, further comprising a capacitor connected to the primary side coil.

11. The non-contact power transmission device according to claim 1, wherein charging is stopped by a charging stop switch.

12. The non-contact power transmission device according to claim 1, wherein the primary side coil is wound as a flat spiral.

13. The non-contact power transmission device according to claim 1, wherein the primary side coil is formed as one of a circle, a rectangle, a hexagon, a triangle, and an ellipse.

14. A non-contact power transmission device that transmits electric power to a power reception device, the non-contact power transmission device comprising:

a primary side coil configured to receive electric power from a power source and transmit the electric power to the power reception device through a magnetic field; and

a control unit configured to stop the power source before the power reception device is stopped when charging is to be stopped.