Resonance type non-contact charging apparatus

• US 8,766,591 B2
• Filed: 12/23/2009
• Issued: 07/01/2014
• Est. Priority Date: 12/24/2008
• Status: Expired due to Fees

• 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: Takada, Kazuyoshi, Suzuki, Sadanori, Nakata, Kenichi, Sakoda, Shimpei, Yamamoto, Yukihiro, Ichikawa, Shinji, Ishikawa, Tetsuhiro
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US12/646,305
• Publication Number:
  US 20100156346A1
• Time in Patent Office: 1,651 Days
• Field of Search: 320/108
• US Class Current: 320/108
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/39 with position-responsive activation of primary coils
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• 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: 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
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A resonance type non-contact charging apparatus is disclosed. A charger of the apparatus receives the high frequency power from a secondary side resonance coil of the apparatus. A power ratio detecting section of the apparatus detects the ratio of the reflected power from a primary side resonance coil to the high frequency power source with respect to the output power from the high frequency power source to the primary side resonance coil. A stop control section of the apparatus stops the high frequency power source when the ratio detected by the power ratio detecting section becomes greater than or equal to a predetermined threshold value.

Claims

1. A resonance type non-contact electrical power feeding apparatus comprising:

a primary LC resonator that receives a power from a power source;

a secondary LC resonator arranged separated from and in a non-contact manner with respect to the primary LC resonator, the secondary LC resonator receiving a power from the primary LC resonator through magnetic field;

a charger that receives the power from the secondary LC resonator;

a detecting section that detects a reflected power from the primary LC resonator to the power source; and

a control section that stops the power source when the value related to reflected power detected by the detecting section reaches greater than or equal to a predetermined threshold value,

wherein the primary LC resonator and the secondary LC resonator each includes an inductor and a capacitor, and

wherein the value related to reflected power is a ratio of a reflected power from the primary LC resonator to the power source with respect to an output power from the power source to the primary LC resonator.

2. The apparatus according to claim 1, wherein a battery is connected to the charger, and wherein the threshold value is set to a value greater than the ratio at the time when the ratio is changed by change of a charging amount of the battery.

3. A resonance type non-contact electric power feeding apparatus comprising:

a primary LC resonator that receives a power from a power source;

a secondary LC resonator arranged separated from and in a non-contact manner with respect to the primary LC resonator, the secondary LC resonator receiving a power from the primary LC resonator through magnetic field;

a charger that receives the power from the secondary LC resonator;

a detecting section that detects a reflected power from the primary LC resonator to the power source; and

a control section that stops the power source when the value related to reflected power detected by the detecting section reaches greater than or equal to a predetermined threshold value,

wherein the value related to reflected power is a ratio of a reflected power from the primary LC resonator to the power source with respect to an output power from the power source to the primary LC resonator.

4. The apparatus according to claim 3, wherein the power source and the primary LC resonator are installed at a ground side, and the secondary LC resonator and the charger are mounted in a vehicle.

5. The apparatus according to claim 3, wherein the vehicle is a hybrid vehicle.