NON-CONTACT POWER TRANSMISSION APPARATUS AND POWER TRANSMISSION METHOD THEREOF

• US 20120175968A1
• Filed: 01/04/2012
• Published: 07/12/2012
• Est. Priority Date: 01/06/2011
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: KATSUNAGA, Hiroshi, TAGUCHI, Yuichi
• Application Number:
  US13/343,168
• Publication Number:
  US 20120175968A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC 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: 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 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 primary coil, a primary resonance coil, a secondary resonance coil, a secondary coil, and a load form a resonant system. A frequency matching section is configured to match the resonant frequency of a resonant system and the output frequency of a high frequency power source with each other when the load fluctuates. An impedance matching section is configured to match the impedance from input terminals of the primary coil to the load at the resonant frequency and the impedance from the high frequency power source to the input terminals of the primary coil with each other.

Claims

1. A non-contact power transmission apparatus comprising:

a high frequency power source;

a primary coil having input terminals for receiving electric power from the high frequency power source;

a primary resonance coil for receiving electric power from the primary coil by electromagnetic induction;

a secondary resonance coil for receiving electric power from the primary resonance coil by magnetic field resonance;

a secondary coil for extracting electric power received by the secondary resonance coil by electromagnetic induction; and

a load to which the electric power received by the secondary coil is supplied,

wherein the primary coil, the primary resonance coil, the secondary resonance coil, the secondary coil, and the load form a resonant system,

the non-contact power transmission apparatus further comprising;

a frequency matching section formed to match the resonant frequency of the resonant system and the output frequency of the high frequency power source with each other when the load fluctuates; and

an impedance matching section formed to match the impedance from the input terminals of the primary coil to the load at the resonant frequency and the impedance from the high frequency power source to the input terminals of the primary coil with each other in a state where the frequency matching section matches the resonant frequency of the resonant system and the output frequency of the high frequency power source with each other.

2. The non-contact power transmission apparatus according to claim 1, wherein the frequency matching section matches the output frequency of the high frequency power source with the resonant frequency of the resonant system.

3. The non-contact power transmission apparatus according to claim 1, wherein the frequency matching section matches the resonant frequency of the resonant system with the output frequency of the high frequency power source.

4. The non-contact power transmission apparatus according to claim 1, further comprising an impedance measuring equipment formed to detect fluctuation of the load.

5. A non-contact power transmission method in a resonant system, wherein the resonant system includes:

a primary coil having input terminals for receiving electric power from a high frequency power source;

a primary resonance coil for receiving electric power from the primary coil by electromagnetic induction;

a secondary resonance coil for receiving electric power from the primary resonance coil by magnetic field resonance;

a secondary coil for extracting electric power received by the secondary resonance coil by electromagnetic induction; and

a load to which the electric power received by the secondary coil is supplied,

the non-contact power transmission method comprising;

matching the resonant frequency of the resonant system and the output frequency of the high frequency power source with each other when the load fluctuates; and

matching the impedance from the input terminals of the primary coil to the load at the resonant frequency and the impedance from the high frequency power source to the input terminals of the primary coil with each other in a state where the resonant frequency of the resonant system and the output frequency of the high frequency power source are matched with each other.