POWER FEEDING DEVICE, POWER RECEIVING DEVICE, AND WIRELESS POWER FEED SYSTEM

• US 20180166885A1
• Filed: 02/09/2018
• Published: 06/14/2018
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KAMATA, Koichiro, SATO, Misako, MAEDA, Shuhei
• Granted Patent: US 11,424,622 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A wireless power feed system with high transfer efficiency of electric power is disclosed. The wireless power feed system includes a power feeding device and a power receiving device, wherein the power feeding device includes a first electromagnetic coupling coil that is connected to an AC power source via a directional coupler; a first resonant coil; a switch connected to the opposite ends of the first resonant coil; a control circuit which conducts switching on/off of the switch based on a parameter of an amplitude of a reflective wave detected by the directional coupler; and an analog-digital converter provided between the first electromagnetic coupling coil and the control circuit; and the power receiving device includes a second resonant coil; and a second electromagnetic coupling coil, and wherein the first electromagnetic coupling coil is provided between the first resonant coil and the second resonant coil.

Claims

1. (canceled)

2. A power receiving device comprising:

an electromagnetic coupling coil;

a secondary battery electrically connected to the electromagnetic coupling coil;

a rectifier electrically connected to the electromagnetic coupling coil; and

a control circuit,

wherein the power receiving device is configured to switch a power receiving by electromagnetic coupling method and a power receiving by a method other than electromagnetic coupling method.

3. The power receiving device according to claim 2,

wherein the method other than electromagnetic coupling method is resonant method.

4. The power receiving device according to claim 3, further comprising:

a resonant coil,

wherein the resonant coil is configured to electromagnetically coupled with the electromagnetic coupling coil when the power receiving by resonant method is performed.

5. The power receiving device according to claim 2,

wherein the power receiving device is a portable information terminal.

6. A power receiving device comprising:

an electromagnetic coupling coil;

a secondary battery electrically connected to the electromagnetic coupling coil;

a rectifier electrically connected to the electromagnetic coupling coil; and

a control circuit,

wherein the power receiving device is configured to switch a power receiving by electromagnetic coupling method and a power receiving by a method other than electromagnetic coupling method based on a parameter input to the control circuit.

7. The power receiving device according to claim 6,

wherein the method other than electromagnetic coupling method is resonant method.

8. The power receiving device according to claim 7, further comprising:

a resonant coil,

wherein the resonant coil is configured to electromagnetically coupled with the electromagnetic coupling coil when the power receiving by resonant method is performed.

9. The power receiving device according to claim 6,

wherein the parameter represents a DC voltage applied to opposite ends of the secondary battery by transfer of power rectified by the rectifier.

10. The power receiving device according to claim 6,

wherein the power receiving device is a portable information terminal.