POWER RECEIVING DEVICE AND POWER FEEDING SYSTEM

• US 20130154385A1
• Filed: 12/10/2012
• Published: 06/20/2013
• Est. Priority Date: 12/16/2011
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Maeda, Shuhei, Miwa, Misako
• Granted Patent: US 9,847,675 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/025 using non-contact coupling, e.g. inductive, capacitive
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The invented power feeding system includes power transmitting and power receiving devices. The power transmitting device includes an AC power source, a first electromagnetic induction coil, a first resonant coil, and a first capacitor. The power receiving device includes an antenna unit including a second resonant coil, a second capacitor, and a second electromagnetic induction coil; a charging circuit unit including a rectifier circuit, a power storage device, a current detection circuit for detecting a current value supplied to the power storage device, and a voltage detection circuit for detecting a voltage value applied to the power storage device; and a communication control unit including a control circuit for generating a selection signal based on the detected current value and the detected current voltage, a plurality of switches to be turned on or off by the selection signal, and passive elements electrically connected to the plurality of switches.

Claims

1. A power receiving device comprising:

an antenna unit comprising a resonant coil, a capacitor, and an electromagnetic induction coil;

a charging circuit unit comprising a rectifier circuit, a power storage device, a current detection circuit for detecting a current value supplied to the power storage device, and a voltage detection circuit for detecting a voltage value applied to the power storage device; and

a communication control unit comprising a control circuit for generating a selection signal based on the detected current value and the detected voltage value, a plurality of switches to be turned on or off by the selection signal, and a passive element electrically connected to each of the plurality of switches.

2. The power receiving device according to claim 1, wherein the passive element is any one of a capacitor, a coil and a resistor.

3. The power receiving device according to claim 1, wherein each of the plurality of switches is a transistor.

4. A power feeding system comprising:

a power transmitting device comprising an AC power source, a first electromagnetic induction coil, a first resonant coil, and a first capacitor, and

a power receiving device comprising;

an antenna unit comprising a second resonant coil, a second capacitor, and a second electromagnetic induction coil;

a charging circuit unit comprising a rectifier circuit, a power storage device, a current detection circuit for detecting a current value supplied to the power storage device, and a voltage detection circuit for detecting a voltage value applied to the power storage device; and

a communication control unit comprising a control circuit for generating a selection signal based on the detected current value and the detected voltage value, a plurality of switches to be turned on or off by the selection signal, and a passive element electrically connected to each of the plurality of switches.

5. The power feeding system according to claim 4, wherein the passive element is any one of a capacitor, a coil, and a resistor.

6. The power feeding system according to claim 4, wherein each of the plurality of switches is a transistor.