NON-CONTACT POWER TRANSMISSION APPARATUS AND DESIGN METHOD

• US 20110227421A1
• Filed: 11/27/2009
• Published: 09/22/2011
• Est. Priority Date: 12/01/2008
• Status: Abandoned Application

• 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: Suzuki, Sadanori, Nakata, Keinichi, Yamamoto, Yukihiro, Ishikawa, Tetsuhiro, Ichikawa, Shinji, Takada, Kazuyoshi, Sakoda, Shimpei
• Application Number:
  US13/131,707
• Publication Number:
  US 20110227421A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H02J 50/12 of the resonant type
• 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: Y10T 29/49002 Electrical device making

Abstract

A non-contact power transmission apparatus is disclosed. The non-contact power transmission apparatus includes an alternating-current power source and a resonant system. The resonant system includes a primary coil connected to the alternating-current power source, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil is connected to a load. The apparatus also has a first capacitor and a second capacitor. A first resonant frequency, which is a resonant frequency of the primary-side resonance coil and the first capacitor, and a second resonant frequency, which is a resonant frequency of the secondary-side resonance coil and the second capacitor, are set to be equal to each other. The frequency of an alternating voltage of the alternating-current power source is set to match with the first resonant frequency and the second resonant frequency.

Claims

1. A non-contact power transmission apparatus comprising an alternating-current power source and a resonant system, the resonant system including a primary coil connected to the alternating-current power source, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected, the apparatus comprising:

a first capacitor that is connected in parallel to the primary-side resonance coil; and

a second capacitor that is connected in parallel to the secondary-side resonance coil, wherein

a first resonant frequency, which is a resonant frequency of the primary-side resonance coil and the first capacitor, and a second resonant frequency, which is a resonant frequency of the secondary-side resonance coil and the second capacitor, are set to be equal to each other, and

the frequency of an alternating voltage of the alternating-current power source is set to match with the first resonant frequency and the second resonant frequency.

2. The non-contact power transmission apparatus according to claim 1, wherein the first and second capacitors are variable capacitors.

3. A method for designing a non-contact power transmission apparatus comprising an alternating-current power source and a resonant system, the resonant system including a primary coil connected to the alternating-current power source, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected, the method comprising:

connecting in parallel a first capacitor to the primary-side resonance coil;

connecting in parallel a second capacitor to the secondary-side resonance coil;

setting, to be equal to each other, a first resonant frequency, which is a resonant frequency of the primary-side resonance coil and the first capacitor, and a second resonant frequency, which is a resonant frequency of the secondary-side resonance coil and the second capacitor;

setting the specifications of the primary-side and secondary-side resonance coils and the specifications of the first and second capacitors;

calculating the first and second resonant frequencies; and

adjusting the frequency of an output voltage of the alternating-current power source to match with the first and second resonant frequencies.

4. A method for designing a non-contact power transmission apparatus comprising an alternating-current power source and a resonant system, the resonant system including a primary coil connected to the alternating-current power source, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected, the method comprising:

connecting in parallel a first capacitor to the primary-side resonance coil;

connecting in parallel a second capacitor to the secondary-side resonance coil;

setting, to be equal to each other, a first resonant frequency, which is a resonant frequency of the primary-side resonance coil and the first capacitor, and a second resonant frequency, which is a resonant frequency of the secondary-side resonance coil and the second capacitor;

setting the frequency of an alternating voltage of the alternating-current power source and the specifications of the primary-side resonance coil and the secondary-side resonance coil; and

adjusting the capacitance values of the first and second capacitors such that the first and second resonant frequencies match with the frequency of the alternating voltage of the alternating-current power source.