DRIVE METHOD FOR NON-CONTACT POWER SUPPLY DEVICE, NON-CONTACT POWER SUPPLY DEVICE, AND NON-CONTACT POWER SUPPLY SYSTEM

• US 20140346889A1
• Filed: 09/21/2012
• Published: 11/27/2014
• Est. Priority Date: 09/22/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Abe, Hideaki
• Granted Patent: US 9,948,222 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: H02N 2/181 Circuits; Control arrangements or methods
• CPC Class Codes: H02N 2/186 Vibration harvesters
• CPC Class Codes: H02P 9/48 Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle H02P9/04 - H02P9/46 take precedence

Abstract

A power supply device (2) is provided with a push-type power generator (4). When a push-button (5) on the push-type power generator (4) is pushed, a variable voltage is generated by a piezoelectric element (6) that excites a primary coil (L1). A high-frequency inverter (8) is activated by the variable voltage, exciting the primary coil (L1), and an alternating field is generated from the primary coil (L1). Secondary power can be supplied by means of the alternating field even if a secondary coil (L2) of an electrical device (10), disposed on a surface of a wall (1) opposite the surface on which the charging device (2) is disposed, is not in contact with the power supply device (2). The secondary coil (L2) of the electrical device (10) causes a light-emitting diode (LED1) to illuminate using secondary power obtained by non-contact power supply.

Claims

1. A method for driving a contactless power supply device that supplies power to an electronic device including a secondary coil and a load, wherein the contactless power supply device including a primary coil and a high frequency inverter, the high frequency inverter supplies high frequency current to the primary coil to generate an alternating magnetic field, the alternating magnetic field generates an induced electromotive force at the secondary coil, and the load is driven using the electromotive force, the method comprising:

connecting a resonance capacitor to the primary coil;

connecting a fluctuating voltage power generating device to the high frequency inverter; and

performing an inverter operation with the high frequency inverter using a fluctuating voltage generated by the fluctuating voltage power generating device.

2. The method for driving a contactless power supply device according to claim 1, wherein the fluctuating voltage power generating device includes at least one of a power generating device that generates power with human power and a power generating device that generates power with natural energy.

3. The method for driving a contactless power supply device according to claim 2, wherein the power generating device that generates power with human power is a power generating device that generates power with human power related to a living activity of a person.

4. A contactless power supply device that supplies power to an electronic device including a secondary coil and a load, wherein the contactless power supply device includes a primary coil and a high frequency inverter, the high frequency inverter supplies high frequency current to the primary coil to generate an alternating magnetic field, the alternating magnetic field generates an induced electromotive force at the secondary coil, and the load of the electric device is driven using the electromotive force, the contactless power supply device comprising:

a fluctuating voltage power generating device that is connected to the high frequency inverter and generates a fluctuating voltage used by the high frequency inverter to perform an inverter operation.

5. The contactless power supply device according to claim 4, characterized in that the high frequency inverter includes a resonance capacitor connected to the primary coil, and the high frequency inverter is a voltage resonance type inverter.

6. The contactless power supply device according to claim 4, wherein the high frequency inverter is a self-excitation voltage resonance type high frequency inverter.

7. The contactless power supply device according to any one of claim 4, wherein the high frequency inverter includes a switching element that generates a flow of current to the primary coil, and the switching element is a single-transistor voltage resonance type high frequency inverter.

8. The contactless power supply device according to any one of claim 4, wherein the high frequency inverter includes a switching element that generates a flow of current to the primary coil, and the switching element is a bipolar transistor.

9. The contactless power supply device according to any one of claim 4, wherein the fluctuating voltage power generating device includes at least one of a power generating device that generates power with human power and a power generating device that generates power with natural energy.

10. The contactless power supply device according to claim 9, wherein the power generating device that generates power with human power is a power generating device that generates power with human power related to a living activity of a person.

11. The contactless power supply device according to any one of claim 4, wherein the contactless power supply device includes

a power plug, and

a second fluctuating voltage power generating device that is connected to the power plug and supplies the high frequency inverter with a fluctuating voltage for operating the high frequency inverter through the power plug.

12. A contactless power supply system comprising:

a contactless power supply device including a primary coil and a high frequency inverter, wherein the high frequency inverter supplies high frequency current to the primary coil to generate an alternating magnetic field; and

an electric device including a secondary coil, a power receiving circuit, and a load, wherein the alternating magnetic field generates an induced electromotive force at the secondary coil, the electromotive force is supplied to the load through the power receiving circuit, and the load is driven by the supplied electromotive force,

wherein the contactless power supply device includes a fluctuating voltage power generating device that is connected to the high frequency inverter and generates a fluctuating voltage used by the high frequency inverter to perform an inverter operation.

13. The contactless power supply system according to claim 12, wherein at least one of the primary coil and the secondary coil is connected to a resonance capacitor, and the high frequency inverter is a voltage resonance type inverter.

14. The contactless power supply system according to claim 12, wherein the high frequency inverter is a self-excitation voltage resonance type high frequency inverter.

15. The contactless power supply system according to any one of claim 12, wherein the high frequency inverter includes a switching element that generates a flow of current to the primary coil, and the switching element is a single-transistor voltage resonance type high frequency inverter.

16. The contactless power supply system according to any one of claim 12, wherein the fluctuating voltage power generating device includes at least one of a power generating device that generates power with human power and a power generating device that generates power with natural energy.

17. The contactless power supply system according to claim 16, wherein the power generating device that generates power with the human power is a power generating device that generates power with human power related to a living activity of a person.

18. The contactless power supply system according to any one of claim 12, wherein

the contactless power supply system further includes a structural object through which an alternating magnetic field passes;

and

the contactless power supply device and the electric device are arranged on opposite sides of the structural object, and the primary coil of the contactless power supply device is arranged facing the secondary coil of the electric device.

19. The contactless power supply system according to any one of claim 12, wherein the contactless power supply device includes a first housing and the electric device includes a second housing, the contactless power supply device and the electric device are integrated so that the first and second housings overlap, and the primary coil of the contactless power supply device and the secondary coil of the electric device are arranged to face each other through the first and second housings.

20. The contactless power supply system according to any one of claim 12, wherein the contactless power supply device includes

a power plug, and

a second fluctuating voltage power generating device that is connected to the power plug and supplies a fluctuating voltage for operating the high frequency inverter to the high frequency inverter through the power plug.