WIRELESS POWER FEEDING SYSTEM AND WIRELESS POWER FEEDING METHOD

• US 20110309688A1
• Filed: 06/09/2011
• Published: 12/22/2011
• Est. Priority Date: 06/17/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Koyama, Jun, Kurokawa, Yoshiyuki, Shionoiri, Yutaka
• Granted Patent: US 8,803,370 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

An object is to provide a power feeding system and a power feeding method which are higher convenient for a power feeding user on the power receiving side. Another object is to provide a power feeding system and a power feeding method which can offer efficient services by determining or managing a power feeding user and controlling the amount of power supplied to the power receiver appropriately by a company on the power feeding side. A power feeding device which supplies power to a power receiver wirelessly manages the power receiver on the basis of identification information of the power receiver and controls power transmitted to the power receiver on the basis of position information of the power receiver.

Claims

1. A wireless power feeding system comprising a power feeding device and a power receiver which includes a power receiving device portion and a power load portion,

wherein the power feeding device comprises:

a transmission/reception circuit portion which transmits and receives an electromagnetic wave;

a signal processing circuit portion which processes an electrical signal of the electromagnetic wave transmitted to and received from the transmission/reception circuit portion; and

a power supply portion which supplies power transmitted to the power receiver,

wherein the power receiving device portion comprises;

a transmission/reception circuit portion which transmits and receives an electromagnetic wave;

a signal processing circuit portion which processes an electrical signal of the electromagnetic wave transmitted to and received from the transmission/reception circuit portion;

a memory portion including identification information of the power receiver; and

a power storage portion including a secondary battery which stores power transmitted from the power feeding device,

wherein the signal processing circuit portion in the power feeding device includes an identification function of identifying the identification information and a power transmission control function of controlling power transmitted to the power receiver, and

wherein the transmission/reception circuit portion in the power receiving device portion includes a position detection function of detecting a position of the power receiver and a power reception control function of controlling power received from the power feeding device.

2. The wireless power feeding system according to claim 1, wherein the transmission/reception circuit portion in the power feeding device and the transmission/reception circuit portion in the power receiving device portion each comprise an antenna circuit, a rectifier circuit, a modulation circuit, a demodulation circuit, and an oscillator circuit.

3. A wireless power feeding system comprising a power feeding device and a power receiver which includes a power receiving device portion and a power load portion,

wherein the power feeding device comprises:

a transmission/reception circuit portion which transmits and receives an electromagnetic wave;

a signal processing circuit portion which processes an electrical signal of the electromagnetic wave transmitted to and received from the transmission/reception circuit portion; and

a power supply portion which supplies power transmitted to the power receiver,

wherein the power receiving device portion comprises;

a transmission/reception circuit portion which transmits and receives an electromagnetic wave;

a signal processing circuit portion which processes an electrical signal of the electromagnetic wave transmitted to and received from the transmission/reception circuit portion;

a memory portion including identification information of the power receiver;

a power storage portion including a secondary battery which stores power transmitted from the power feeding device; and

a detection portion which detects at least one of voltage and current of the secondary battery,

wherein the signal processing circuit portion in the power feeding device includes an identification function of identifying the identification information and a power transmission control function of controlling power transmitted to the power receiver, and

wherein the transmission/reception circuit portion in the power receiving device portion includes a position detection function of detecting a position of the power receiver and a power reception control function of controlling power received from the power feeding device.

4. The wireless power feeding system according to claim 3, wherein the transmission/reception circuit portion in the power feeding device and the transmission/reception circuit portion in the power receiving device portion each comprise an antenna circuit, a rectifier circuit, a modulation circuit, a demodulation circuit, and an oscillator circuit.

5. A wireless power feeding method comprising:

recognizing identification information of a power receiver by a power feeding device;

detecting a position of the power receiver, and transmitting position detection information of the power receiver to the power feeding device;

adjusting a strength of transmitted power based on the identification information and the position detection information, and transmitting power to the power receiver; and

receiving and storing the transmitted power in a secondary battery of a power storage portion.

6. The wireless power feeding method according to claim 5, wherein the power receiver detects at least one of voltage and current of the secondary battery, and transmits a power receiving request signal or a power receiving end signal to the power feeding device based on the position detection information.

7. The wireless power feeding method according to claim 5, wherein the power receiver receives a position detection signal from the power feeding device and detects a strength of the position detection signal to detect a position of the power feeding device.

8. The wireless power feeding method according to claim 5, wherein the power feeding device transmits a signal for searching the power receiver which includes the identification information to another power feeding device when the power feeding device cannot receive a signal from the power receiver for a certain time or more.