POWER RECEIVING UNIT, POWER FEEDING CONTROL METHOD, AND FEED SYSTEM

• US 20170012470A1
• Filed: 02/10/2015
• Published: 01/12/2017
• Est. Priority Date: 02/24/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: NAKANO, HIROAKI, BUNSEN, KEIGO, KOZAKAI, OSAMU, FUJIMAKI, KENICHI
• Granted Patent: US 10,298,064 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A power receiving unit of the disclosure includes: a power generation section configured to generate direct-current power, based on a power signal supplied wirelessly from a power feeding unit; and a communication section configured to set a load of the power signal in accordance with an output current of the power generation section, and to communicate with the power feeding unit by modulating the load.

Claims

1. A power receiving unit comprising:

a power generation section configured to generate direct-current power, based on a power signal supplied wirelessly from a power feeding unit; and

a communication section configured to set a load of the power signal in accordance with an output current of the power generation section, and to communicate with the power feeding unit by modulating the load.

2. The power receiving unit according to claim 1, wherein the communication section sets the load to cause, when the output current of the power generation section is large, impedance of the load to be smaller, and to cause, when the output current of the power generation section is small, the impedance of the load to be larger.

3. The power receiving unit according to claim 1,

wherein the communication section includes

a first switch,

a first passive element connected in series to the first switch,

a second switch, and

a second passive element connected in series to the second switch, and

wherein the communication section sets the load by determining a switch to be turned on or off out of the first switch and the second switch in accordance with the output current of the power generation section.

4. The power receiving unit according to claim 3, wherein an element value of the first passive element is different from an element value of the second passive element.

5. The power receiving unit according to claim 3, wherein each of the first passive element and the second passive element is a capacitor.

6. The power receiving unit according to claim 3, wherein each of the first passive element and the second passive element is a resistor.

7. The power receiving unit according to claim 1, wherein the communication section includes

a switch, and

a variable passive element connected in series to the switch, and configured to cause an element value to be varied in accordance with the output current of the power generation section.

8. The power receiving unit according to claim 7, wherein the variable passive element is a variable capacitor.

9. The power receiving unit according to claim 7, wherein the variable passive element is a variable resistor.

10. The power receiving unit according to claim 1, wherein

the power generation section includes a rectifier circuit configured to rectify the power signal, and

the communication section sets the load of the power signal, based on an output current of the rectifier circuit.

11. The power receiving unit according to claim 10, wherein the communication section sets the load, also based on an output voltage of the rectifier circuit.

12. The power receiving unit according to claim 1, wherein

the power generation section includes a regulator circuit configured to generate the direct-current power, and

the communication section sets the load, based on an output current of the regulator circuit.

13. A power feeding control method comprising:

generating direct-current power, based on a power signal supplied wirelessly from a power feeding unit; and

communicating with the power feeding unit by setting a load of the power signal in accordance with a current to a circuit that is supplied with the direct-current power and modulating the load.

14. A feed system provided with a power feeding unit and a power receiving unit, the power receiving unit comprising:

a power generation section configured to generate direct-current power, based on a power signal supplied wirelessly from the power feeding unit; and

a communication section configured to set a load of the power signal in accordance with an output current of the power generation section, and to communicate with the power feeding unit by modulating the load.