WIRELESS POWER TRANSMITTING APPARATUS, WIRELESS POWER RECEIVING APPARATUS, AND CIRCUIT FOR CORRECTING DIFFERENTIAL SIGNAL

• US 20170085132A1
• Filed: 04/25/2016
• Published: 03/23/2017
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: YEO, Sung-Ku, Kim, Do-Won, KIM, Dong-Zo, Kim, Bong-Chul, CHUNG, Hyung-Koo
• Granted Patent: US 10,411,513 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A wireless power transmitting apparatus wirelessly charging a wireless power receiving apparatus is provided. The wireless power transmitting apparatus includes a power providing unit configured to provide power, a gate driver configured to generate a differential signal formed of a first signal and a second signal from the power provided from the power providing unit, an amplifier configured to amplify the differential signal by a predetermined gain, a power transmitting unit configured to transmit the amplified differential signal to the wireless power receiving apparatus, and a differential signal correcting circuit that is disposed between the gate driver and the amplifier and is configured to correct the differential signal so that a predetermined phase difference between the first signal and the second signal is maintained.

Claims

1. A wireless power transmitting apparatus wirelessly charging a wireless power receiving apparatus, the wireless power transmitting apparatus comprising:

a power providing unit configured to provide power;

a gate driver configured to generate a differential signal formed of a first signal and a second signal from the power provided from the power providing unit;

an amplifier configured to amplify the differential signal by a predetermined gain;

a power transmitting unit configured to transmit the amplified differential signal to the wireless power receiving apparatus; and

a differential signal correcting circuit that is disposed between the gate driver and the amplifier and is configured to correct the differential signal so that a predetermined phase difference between the first signal and the second signal is maintained.

2. The wireless power transmitting apparatus of claim 1, wherein the differential signal correcting circuit includes:

a first NAND gate configured to receive the first signal through a first input terminal; and

a second NAND gate configured to receive the second signal through a third input terminal.

3. The wireless power transmitting apparatus of claim 2, wherein an output terminal of the first NAND gate is connected to a fourth input terminal of the second NAND gate, and an output terminal of the second NAND gate is connected to a second input terminal of the first NAND gate.

4. The wireless power transmitting apparatus of claim 1, wherein the differential signal correcting circuit includes:

a first N-channel metal-oxide-semiconductor field-effect transistor (N-MOSFET), in which the first signal is applied to a first drain; and

a second N-MOSFET, in which the second signal is applied to a second drain.

5. The wireless power transmitting apparatus of claim 4, wherein a first source of the first N-MOSFET is grounded, and a first gate of the first N-MOSFET is connected to the second drain of the second N-MOSFET, and

a second source of the second N-MOSFET is grounded, and a second gate of the second N-MOSFET is connected to the first drain of the first N-MOSFET.

6. The wireless power transmitting apparatus of claim 1, further comprising:

a delay compensating circuit configured to compensate for a delay between the first signal and a reverse signal of the second signal.

7. The wireless power transmitting apparatus of claim 6, further comprising:

a measuring unit configured to measure at least one of a load, a voltage, and a current at one or more points of the wireless power transmitting apparatus; and

a control unit configured to determine the compensated delay by using at least one of the load, the voltage, and the current.

8. The wireless power transmitting apparatus of claim 6, further comprising:

a control unit configured to;

receive information on the delay between the first signal and the reverse signal of the second signal from the wireless power receiving apparatus, and

control the delay compensating circuit so as to compensate for the delay between the first signal and the reverse signal of the second signal based on the received information.

9. A wireless power transmitting apparatus wirelessly charging a wireless power receiving apparatus, the wireless power transmitting apparatus comprising:

a power providing unit configured to provide power;

a gate driver configured to generate a differential signal from the power provided from the power providing unit;

an amplifier configured to amplify the differential signal by a predetermined gain;

a power transmitting unit configured to transmit the amplified differential signal to the wireless power receiving apparatus; and

a differential signal correcting circuit that is disposed between the amplifier and the power transmitting unit and is configured to correct the differential signal so that a predetermined phase difference between a first signal and a second signal that configures the amplified differential signal is maintained.

10. The wireless power transmitting apparatus of claim 9, wherein the differential signal correcting circuit includes:

a first NAND gate configured to receive the first signal through a first input terminal; and

a second NAND gate configured to receive the second signal through a third input terminal.

11. The wireless power transmitting apparatus of claim 10, wherein an output terminal of the first NAND gate is connected to a fourth input terminal of the second NAND gate, and an output terminal of the second NAND gate is connected to a second input terminal of the first NAND gate.

12. The wireless power transmitting apparatus of claim 9, wherein the differential signal correcting circuit includes:

a first N-channel metal-oxide-semiconductor field-effect transistor (N-MOSFET), in which the first signal is applied to a first drain; and

a second N-MOSFET, in which the second signal is applied to a second drain.

13. The wireless power transmitting apparatus of claim 12, wherein a first source of the first N-MOSFET is grounded, and a first gate of the first N-MOSFET is connected to the second drain of the second N-MOSFET, and

a second source of the second N-MOSFET is grounded, and a second gate of the second N-MOSFET is connected to the first drain of the first N-MOSFET.

14. The wireless power transmitting apparatus of claim 9, further comprising:

a delay compensating circuit configured to compensate for a delay between the first signal and a reverse signal of the second signal.

15. The wireless power transmitting apparatus of claim 14, further comprising:

a measuring unit configured to measure at least one of a load, a voltage, and a current at one or more points of the wireless power transmitting apparatus; and

a control unit configured to determine the compensated delay by using at least one of the load, the voltage, and the current.

16. The wireless power transmitting apparatus of claim 14, further comprising:

a control unit configured to;

receive information on the delay between the first signal and the reverse signal of the second signal from the wireless power receiving apparatus, and

control the delay compensating circuit so as to compensate for the delay between the first signal and the reverse signal of the second signal based on the received information.

17. A wireless power receiving apparatus wirelessly receiving power a wireless power transmitting apparatus, the wireless power receiving apparatus comprising:

a power receiving unit configured to wirelessly receive the power from the wireless power transmitting apparatus;

a rectifier configured to rectify a differential signal output from the power receiving unit;

a direct current to direct current (DC/DC) converter configured to DC/DC convert the rectified differential signal; and

a differential signal correcting circuit that is disposed between the power receiving unit and the rectifier, and is configured to correct the differential signal so that a predetermined phase difference between a first signal and a second signal that configures the differential signal is maintained.

18. The wireless power receiving apparatus of claim 17, wherein the differential signal correcting circuit includes:

a first NAND gate configured to receive the first signal through a first input terminal; and

a second NAND gate configured to receive the second signal through a third input terminal.

19. The wireless power receiving apparatus of claim 18, wherein an output terminal of the first NAND gate is connected to a fourth input terminal of the second NAND gate, and an output terminal of the second NAND gate is connected to a second input terminal of the first NAND gate.

20. The wireless power receiving apparatus of claim 17, wherein the differential signal correcting circuit includes:

a first N-channel metal-oxide-semiconductor field-effect transistor (N-MOSFET), in which the first signal is applied to a first drain; and

a second N-MOSFET, in which the second signal is applied to a second drain.