Resonance type non-contact charging apparatus that matches the input impedance of the resonance system with the output impedance of the AC power source

• US 8,716,974 B2
• Filed: 11/05/2010
• Issued: 05/06/2014
• Est. Priority Date: 11/09/2009
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: Sakoda, Shimpei, Takada, Kazuyoshi
• Primary Examiner(s): Fantu, Yalkew
• Assistant Examiner(s): HERNANDEZ, MANUEL J
• Application Number:
  US12/940,648
• Publication Number:
  US 20110109263A1
• Time in Patent Office: 1,278 Days
• Field of Search: 320/108, 307/104
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/20 AC to AC 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: H02J 50/12 of the resonant type
• 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
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A resonance type non-contact charging system is disclosed that includes a resonance system. The resonance system has a primary side resonance coil, a secondary side resonance coil, a reflected power detecting section, a power converting section having a DC/DC converter, and a battery. The charging system has a controlling section that controls the DC/DC converter. The controlling section controls the duty cycle of the DC/DC converter based on detection result of the reflected power detecting section such that the input impedance of the resonance system at the resonant frequency and the output impedance of a high-frequency power source match each other.

Claims

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

primary side equipment including;

an AC power source;

a primary side resonance coil for receiving power from the AC power source; and

a reflected power detecting section for detecting a reflected power from the primary side resonance coil to the AC power source; and

secondary side equipment including;

a secondary side resonance coil for receiving power via magnetic resonance from the primary side resonance coil;

a power converting section that has a DC/DC converter and inputs power from the secondary side resonance coil;

a load connected to the power converting section; and

a controlling section for controlling the DC/DC converter,

wherein the controlling section controls a duty cycle of the DC/DC converter based on a detection result of the reflected power detecting section to decrease the reflected power from the primary side resonance coil to the AC power source.

2. The apparatus according to claim 1, further comprising a primary coil connected to the AC power source and a secondary coil connected to the power converting section,

wherein the primary side resonance coil receives power from the AC power source through the primary coil,

wherein the secondary coil receives power from the secondary side resonance coil, and

wherein the power converting section receives the power received by the secondary side resonance coil through the secondary coil.

3. The apparatus according to claim 1, further comprising an impedance detecting section for detecting a ratio of a current and a voltage input into the DC/DC converter,

wherein the controlling section controls the duty cycle of the DC/DC converter based on a detection result of the impedance detecting section.

4. The apparatus according to claim 1, further comprising a state-of-load detecting section for detecting the state of the load,

wherein the controlling section controls the duty cycle of the DC/DC converter based on a detection result of the state-of-load detecting section.

5. The apparatus according to claim 1,

wherein the controlling section controls the duty cycle of the DC/DC converter such that the reflected power becomes less than or equal to a predetermined threshold value.

6. The apparatus according to claim 1, wherein the primary side resonance coil is connected to the AC power source, and the secondary side resonance coil is connected to the power converting section.

7. The apparatus according to claim 1, wherein the load is a battery mounted on a moving body,

wherein the apparatus is used in a resonance type non-contact charging system for charging the battery, and

wherein the secondary side resonance coil, the power converting section, the battery, and the controlling section are mounted on the moving body.