Power transfer system and noncontact charging device

• US 8,907,617 B2
• Filed: 12/19/2011
• Issued: 12/09/2014
• Est. Priority Date: 06/25/2009
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Ichikawa, Keiichi, Bondar, Henri
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): RAMADAN, RAMY O
• Application Number:
  US13/329,630
• Publication Number:
  US 20120146574A1
• Time in Patent Office: 1,086 Days
• Field of Search: 320/107, 320/108, 307/104, 307/149
• US Class Current: 320/107
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A power transfer system includes a power transmission device, a power reception device and a capacitive coupling conductor. A high-voltage side conductor is formed near the upper surface of a casing of the power transmission device, and a low-voltage side conductor is formed near the lower or surrounding surface of the casing. The power transmission device includes an alternating voltage generating circuit. A high-voltage side conductor is formed near the lower surface of a casing of the power reception device, and a low-voltage side conductor is formed near the upper surface of the casing of the power reception device. The power reception device includes a load circuit. The high-voltage side conductors are capacitively coupled to each other when facing each other, and the low-voltage side conductors are capacitively coupled to each other via a capacitive coupling conductor.

Claims

1. A power transfer system comprising:

a power transmission device having a power transmission capacitive coupling electrode that includes a power transmission high-voltage side conductor and a power transmission low-voltage side conductor;

a power reception device having a power reception capacitive coupling electrode that includes a power reception high-voltage side conductor and a power reception low-voltage side conductor;

a capacitive coupling conductor capacitively coupled to the power transmission low-voltage side conductor and the power reception low-voltage side conductor;

an alternating voltage generating circuit that generates an alternating voltage that is applied between the power transmission high-voltage side conductor and the power transmission low-voltage side conductor; and

a load circuit of electric power induced between the power reception high-voltage side conductor and the power reception low-voltage side conductor.

2. The power transfer system according to claim 1, wherein the capacitive coupling conductor is a woven fabric containing a conductive material.

3. The power transfer system according to claim 1, wherein the capacitive coupling conductor is a body formed of a conductor.

4. The power transfer system according to claim 1, wherein the capacitive coupling conductor is a metal plate.

5. The power transfer system according to claim 4, wherein the metal plate surrounds the power reception device.

6. The power transfer system according to claim 4, wherein the metal plate is configured to surround both the power transmission device and the power reception device.

7. A noncontact charging device comprising:

the power transfer system according to claim 1, wherein

the load circuit includes a rectifying smoothing circuit that rectifies and smoothes an alternating voltage induced between the power reception high-voltage side conductor and the power reception low-voltage side conductor and a charging element that is charged with an output from the rectifying smoothing circuit, and

the power transmission device is provided with a control circuit that controls the alternating voltage generating circuit to control charging to the charging element or the load circuit is provided with a control circuit that controls the rectifying smoothing circuit to control charging to the charging element.

8. A power transfer system comprising:

a power transmission device having a power transmission capacitive coupling electrode that includes a power transmission high-voltage side conductor and a power transmission low-voltage side conductor;

a power reception device having a power reception capacitive coupling electrode that includes a power reception high-voltage side conductor and a power reception low-voltage side conductor;

a capacitive coupling conductor that is electrically continuous with the power transmission low-voltage side conductor and capacitively coupled to the power reception low-voltage side conductor;

an alternating voltage generating circuit that generates an alternating voltage that is applied between the power transmission high-voltage side conductor and the power transmission low-voltage side conductor; and

a load circuit of electric power induced between the power reception high-voltage side conductor and the power reception low-voltage side conductor.

9. The power transfer system according to claim 8, wherein the capacitive coupling conductor is a woven fabric containing a conductive material.

10. The power transfer system according to claim 8, wherein the capacitive coupling conductor is a body formed of a conductor.

11. A noncontact charging device comprising:

the power transfer system according to claim 8, wherein

the load circuit includes a rectifying smoothing circuit that rectifies and smoothes an alternating voltage induced between the power reception high-voltage side conductor and the power reception low-voltage side conductor and a charging element that is charged with an output from the rectifying smoothing circuit, and

the power transmission device is provided with a control circuit that controls the alternating voltage generating circuit to control charging to the charging element or the load circuit is provided with a control circuit that controls the rectifying smoothing circuit to control charging to the charging element.