POWER TRANSMISSION SYSTEM

• US 20110025132A1
• Filed: 10/07/2010
• Published: 02/03/2011
• Est. Priority Date: 04/22/2008
• Status: Abandoned Application

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: SATO, Ken
• Application Number:
  US12/899,712
• Publication Number:
  US 20110025132A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: A61B 1/00029 externally powered, e.g. wireless
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• 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: H02M 7/4818 with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A power transmission system for supplying energy to a device operating on electrical energy taken by a power receiving antenna includes a driving unit supplied with electric power from a power supply and generating an AC current and a power transmission antenna receiving the AC current from the driving unit and generating an electromagnetic field. The power transmission antenna includes a resonance frequency adjusting circuit adjusting and setting a resonance frequency.

Claims

1. A power transmission system for supplying energy to a device operating on electrical energy taken by a power receiving antenna, the power transmission system comprising:

a driving unit supplied with electric power from a power supply and generating an AC current;

a power transmission antenna receiving the AC current from the driving unit and generating an electromagnetic field to supply the electrical energy to the device; and

a resonance frequency adjusting circuit provided in the power transmission antenna and adjusting and setting a resonance frequency.

2. The power transmission system according to claim 1, wherein the resonance frequency adjusting circuit adjusts and sets the resonance frequency of the power transmission antenna to a frequency different from a resonance frequency of a power transmission antenna provided in another of the energy supply apparatus located close to the energy supply apparatus.

3. The power transmission system according to claim 1, wherein the resonance frequency adjusting circuit adjusts and sets the resonance frequency of the power transmission antenna to a frequency that reduces an induced current induced in a power transmission antenna provided in another of the energy supply apparatus located close to the energy supply apparatus.

4. The power transmission system according to claim 1, wherein reactance of the resonance frequency adjusting circuit is adjustable.

5. The power transmission system according to claim 1, wherein the resonance frequency adjusting circuit comprises a circuit including one or more capacitors and/or one or more inductors and a capacitance of at least one capacitor or inductance of at least one inductor is variable.

6. The power transmission system according to claim 1, wherein the resonance frequency of the power receiving antenna is equal to a resonance frequency of the power transmission antenna.

7. The power transmission system according to claim 1, wherein the power receiving antenna comprises a resonance circuit adjusting and setting a resonance frequency and reactance of the resonance circuit is adjustable.

8. The power transmission system according to claim 1, wherein the resonance frequency of the power receiving antenna has a frequency characteristic that enables minimum electric power required for causing the device to operate to be taken in a frequency band from a minimum value to a maximum value of the resonance frequency that can be set in the power transmission antenna.

9. The power transmission system according to claim 6, wherein the resonance frequency of the power receiving antenna is fixed.

10. The power transmission system according to claim 8, wherein the resonance frequency of the power receiving antenna is fixed.

11. The power transmission system according to claim 5, wherein the at least one capacitor is connected to a power transmission coil of the power transmission antenna in series.

12. The power transmission system according to claim 5, wherein the at least one capacitor is connected to a power transmission coil of the power transmission antenna in parallel.

13. The power transmission system according to claim 5, wherein the at least one capacitor is connected to a power transmission coil of the power transmission antenna in series and the at least one inductor is connected to the power transmission coil of the power transmission antenna in parallel.

14. The power transmission system according to claim 5, wherein the at least one capacitor and the at least one inductor are connected to the power transmission coil of the power transmission antenna in parallel.

15. The power transmission system according to claim 5, wherein the at least one capacitor is connected to a power transmission coil of the power transmission antenna in parallel and the at least one inductor is connected to the power transmission coil of the power transmission antenna in series.