Power receiving device and power feeding system

• US 9,847,675 B2
• Filed: 12/10/2012
• Issued: 12/19/2017
• Est. Priority Date: 12/16/2011
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miwa, Misako, Maeda, Shuhei
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Baxter, Brian K
• Application Number:
  US13/709,424
• Publication Number:
  US 20130154385A1
• Time in Patent Office: 1,835 Days
• Field of Search: 307 99, 307149, 307104, 307 43
• 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: 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 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 signal receiving circuit, a control circuit for generating a selection signal based on the detected current value and the detected voltage value, a first switch, a second switch, a third switch, a third capacitor, a first coil and a resistor,

wherein the signal receiving circuit is electrically connected to the control circuit, the third capacitor, the first coil and the resistor,

wherein the control circuit is electrically connected to the first switch, the second switch and the third switch,

wherein the first switch is electrically connected to the third capacitor,

wherein the second switch is electrically connected to the first coil, and

wherein the third switch is electrically connected to the resistor.

2. The power feeding system according to claim 1, wherein each of the first switch, the second switch and the second switch is a transistor.

3. The power feeding system according to claim 2, wherein the control circuit is electrically connected to a gate electrode of the transistor.

4. The power feeding system according to claim 1, wherein the charging circuit unit comprises a smoothing circuit.

5. A power receiving device comprising:

an antenna unit comprising a resonant coil, a first 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 signal receiving circuit, a control circuit for generating a selection signal based on the detected current value and the detected voltage value, a first switch, a second switch, a third switch, a second capacitor, a first coil and a resistor,

wherein the first coil is electrically connected to one of the plurality of switches,

wherein the resistor is electrically connected to another one of the plurality of switches,

wherein the signal receiving circuit is electrically connected to the control circuit, the second capacitor, the first coil and the resistor,

wherein the control circuit is electrically connected to the first switch, the second switch and the third switch,

wherein the first switch is electrically connected to the second capacitor,

wherein the second switch is electrically connected to the first coil, and

wherein the third switch is electrically connected to the resistor.

6. The power receiving device according to claim 5, wherein each of the first switch, the second switch and the third switch is a transistor.

7. The power receiving device according to claim 6, wherein the control circuit is electrically connected to a gate electrode of the transistor.

8. The power receiving device according to claim 5, wherein the charging circuit unit comprises a smoothing circuit.