WIRELESS POWER RECEIVING DEVICE, RECEIVER CIRCUIT THEREOF, AND CONTROL METHOD OF WIRELESS POWER RECEIVING DEVICE

• US 20160020643A1
• Filed: 07/14/2015
• Published: 01/21/2016
• Est. Priority Date: 07/17/2014
• Status: Active Grant

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: IWASAKI, Tatsuya, ABE, Shinichi
• Granted Patent: US 10,224,763 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

The wireless power receiving device includes a receiving antenna, a rectifier circuit connected to the receiving antenna, that generates a rectified voltage, a charging circuit to receive the rectified voltage and charge a power storage device, and a modulator that modulates a voltage or current of the receiving antenna by changing a charging current of the charging circuit based on data to be transmitted to a wireless power transmitting device.

Claims

1. A wireless power receiving device, comprising:

a receiving antenna;

a rectifier circuit connected to the receiving antenna, that generates a rectified voltage;

a charging circuit to receive the rectified voltage and charge a power storage device; and

a modulator that modulates a voltage or current of the receiving antenna by changing a charging current of the charging circuit based on data to be transmitted to a wireless power transmitting device.

2. The wireless power receiving device of claim 1, wherein the charging circuit is capable of switching between the charging current with a first current amount and the charging current with a second current amount.

3. The wireless power receiving device of claim 2, wherein the charging circuit includes a first current source for normally supplying a battery with the first current amount and a second current source for supplying the battery with a differential current between the first current amount and the second current amount to be capable of being in an on state or off state according to the data.

4. A wireless power receiving device comprising:

a receiving antenna;

a rectifier circuit connected to the receiving antenna, that generates a rectified voltage; and

a modulator that modulates a voltage or current of the receiving antenna by changing the current based on data to be transmitted to a wireless power transmitting device, the modulator being provided on a path of a current flowing from the rectifier circuit into a load.

5. The wireless power receiving device of claim 4, wherein the wireless power receiving device complies with a Qi standard.

6. A receiver circuit for use in a wireless power receiving device together with a receiving antenna comprising:

a rectifier circuit connected to the receiving antenna, that generates a rectified voltage;

a charging circuit to receive the rectified voltage and charge a power storage device; and

a modulator that modulates a voltage or current of the receiving antenna by changing a charging current of the charging circuit based on data to be transmitted to a wireless power transmitting device.

7. The receiver circuit of claim 6, wherein the charging circuit is capable of switching between the charging current with a first current amount and the charging current with a second current amount.

8. The receiver circuit of claim 7, wherein the charging circuit includes a first current source for normally supplying a battery with the first current amount, and a second current source for supplying the battery with a differential current between the first current amount and the second current amount to be capable of being in an on state or off state according to the data.

9. The receiver circuit of claim 6, wherein the receiver circuit is integrated on a single semiconductor substrate.

10. A receiver circuit for use in a wireless power receiving device together with a receiving antenna comprising:

a rectifier circuit connected to the receiving antenna, that generates a rectified voltage; and

a modulator that modulates a voltage or current of the receiving antenna by changing an electric current based on data to be transmitted to a wireless power transmitting device, the modulator being provided on a path of a current flowing from the rectifier circuit into a load.

11. The receiver circuit of claim 10, wherein the receiver circuit complies with a Qi standard.

12. A control method of a wireless power receiving device comprising:

receiving a power signal at a receiving antenna,

rectifying a current induced in the receiving antenna and generating a rectified voltage,

charging a power storage device based on the rectified voltage,

modulating a voltage or current of the receiving antenna by changing a charging current for a battery based on data to be transmitted to a wireless power transmitting device, and

transmitting the data to the wireless power transmitting device.