NON-CONTACT POWER TRANSMISSION APPARATUS AND METHOD FOR DESIGNING NON-CONTACT POWER TRANSMISSION APPARATUS

• US 20100115474A1
• Filed: 11/03/2009
• Published: 05/06/2010
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: Nakata, Kenichi, Sakoda, Shimpei, Takada, Kazuyoshi, Suzuki, Sadanori
• Granted Patent: US 8,432,066 B2
• Time in Patent Office: Days
• US Class Current: 716/133
• CPC Class Codes: G06F 30/36 Circuit design at the analogue level
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A non-contact power transmission apparatus having a resonance system is disclosed. The resonance system includes a primary coil to which an alternating-current voltage from an alternating-current source is applied, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected. The impedance of the primary coil is set such that the output impedance of the alternating-current source and the input impedance of the resonance system are matched to each other.

Claims

1. A non-contact power transmission apparatus comprising a resonance system, which includes a primary coil to which an alternating-current voltage from an alternating-current source is applied, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected,

wherein the impedance of the primary coil is set such that the output impedance of the alternating-current source and the input impedance of the resonance system are matched to each other.

2. The apparatus according to claim 1, wherein, when the input impedance of the resonance system and the frequency of the alternating-current voltage are plotted on a graph, the frequency of the alternating-current voltage of the alternating current source is in a range between a first frequency, at which the input impedance of the resonance system has a local maximum value, and a second frequency, at which the input impedance of the resonance system has a local minimum value.

3. The apparatus according to claim 1, wherein the frequency of the alternating-current voltage of the alternating current source is set in an impedance decrease range, where the input impedance of the resonance system is decreased as the frequency of the alternating-current voltage is increased.

4. A method for designing a non-contact power transmission apparatus including a resonance system, which includes a primary coil to which an alternating-current voltage from an alternating-current source is applied, a primary-side resonance coil, a secondary-side resonance coil, and a secondary coil to which a load is connected;

the method comprising;

setting the frequency of the alternating-current voltage of the alternating-current source; and

setting the impedance of the primary coil such that the output impedance of the alternating-current source and the input impedance of the resonance system are matched to each other at the set frequency.

5. The designing method according to claim 4, wherein, when the input impedance of the resonance frequency and the frequency of the alternating-current voltage are plotted on a graph, the frequency of the alternating-current voltage of the alternating current source is in a range between a first frequency, at which the input impedance of the resonance system has a local maximum value, and a second frequency, at which the input impedance of the resonance system has a local minimum value.

6. The designing method according to claim 4, wherein the frequency of the alternating-current voltage of the alternating current source is set in an impedance decrease range, where the input impedance of the resonance system is decreased as the frequency of the alternating-current voltage is increased.