POWER TRANSMITTING APPARATUS

• US 20100244839A1
• Filed: 03/15/2010
• Published: 09/30/2010
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yoshikawa, Hiroyasu
• Granted Patent: US 8,542,018 B2
• Time in Patent Office: Days
• US Class Current: 324/318
• CPC Class Codes: G01R 33/3642 Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification

Abstract

A power transmitting apparatus includes: a first magnetic resonance coil that externally transmits power as energy through magnetic resonance; a first power transmitting-and-receiving unit that supplies power to at least the first magnetic resonance coil; a second magnetic resonance coil that accepts the magnetic field energy through magnetic resonance occurring between the first magnetic resonance coil and the second magnetic resonance coil; a second power transmitting-and-receiving unit that accepts the power at least with reference to the second magnetic resonance coil; a main power supply; and a power supply-management unit configured to select either the power accepted by the second power transmitting-and-receiving unit or power transmitted from the main power supply, and transmit the selected power to the first power transmitting-and-receiving unit and/or transmit the power accepted by the second power transmitting-and-receiving unit and the power transmitted from the main power supply to the first power transmitting-and-receiving unit in combination.

Claims

1. A power transmitting apparatus comprising:

a first magnetic resonance coil configured to externally transmit power as magnetic field energy through magnetic resonance;

a first power transmitting-and-receiving unit configured to supply power to at least the first magnetic resonance coil;

a second magnetic resonance coil configured to accept the magnetic field energy through magnetic resonance occurring between the first magnetic resonance coil and the second magnetic resonance coil;

a second power transmitting-and-receiving unit configured to accept the power at least with reference to the second magnetic resonance coil;

a main power supply; and

a power supply-management unit configured to select (a) either the power accepted by the second power transmitting-and-receiving unit or power transmitted from the main power supply, and transmit the selected power to the first power transmitting-and-receiving unit, and/or (b) transmit the power accepted by the second power transmitting-and-receiving unit and the power transmitted from the main power supply to the first power transmitting-and-receiving unit in combination.

2. The power transmitting apparatus according to claim 1, further comprising a power backflow path provided to electrically connect the second power transmitting-and-receiving unit to the power supply-management unit.

3. The power transmitting apparatus according to claim 1, further comprising an operation switching unit configured to switch between a main power transmitting operation performed to transmit magnetic energy from the first magnetic resonance coil to the second magnetic resonance coil and a backflow operation performed to transmit magnetic energy from the second magnetic resonance coil to the first magnetic resonance coil,

wherein the second power transmitting-and-receiving unit supplies power accepted when the main power transmitting operation is performed to the second magnetic resonance coil when the backflow operation is performed,

wherein the first power transmitting-and-receiving unit accepts power transmitted from the first magnetic resonance coil when the backflow operation is performed, and

wherein the power supply-management unit selects either the power supplied from the main power supply or the power accepted when the backflow operation is performed for use when the main power transmitting operation is performed and/or uses the power supplied from the main power supply and the power accepted when the backflow operation is performed in combination when the main power transmitting operation is performed.

4. The power transmitting apparatus according to claims 1, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction.

5. The power transmitting apparatus according to claims 2, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction.

6. The power transmitting apparatus according to claims 3, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction.

7. The power transmitting apparatus according to claims 1, further comprising a driving unit configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when there is a plurality of peak driving frequencies attained when an efficiency of the magnetic resonance reaches at its peak.

8. The power transmitting apparatus according to claims 2, further comprising a driving unit configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when there is a plurality of peak driving frequencies attained when an efficiency of the magnetic resonance reaches at its peak.

9. The power transmitting apparatus according to claims 3, further comprising a driving unit configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when there is a plurality of peak driving frequencies attained when an efficiency of the magnetic resonance reaches at its peak.

10. The power transmitting apparatus according to claims 4, further comprising a driving unit configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when there is a plurality of peak driving frequencies attained when an efficiency of the magnetic resonance reaches at its peak.