WIRELESS POWER TRANSMITTER AND METHOD OF CONTROLLING THE SAME

• US 20170085133A1
• Filed: 04/26/2016
• Published: 03/23/2017
• Est. Priority Date: 09/22/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Byun, Kang-Ho
• Granted Patent: US 10,454,309 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A method for controlling a wireless power transmitter transmitting wireless power to a wireless power receiver is provided. The method includes generating a first differential signal for the wireless power transmitted to the wireless power receiver, measuring a second differential signal corresponding to the first differential signal applied to a resonating unit of the wireless power transmitter, and detecting at least one of an amplitude and a phase of the second differential signal according to a measurement result, and controlling at least one of the amplitude and the phase of the second differential signal according to a detect result, and controlling the wireless power transmitter based on information on the controlled second differential signal.

Claims

1. A method for controlling a wireless power transmitter transmitting wireless power to a wireless power receiver, the method comprising:

generating a first differential signal for the wireless power transmitted to the wireless power receiver;

measuring a second differential signal corresponding to the first differential signal applied to a resonating unit of the wireless power transmitter, and detecting at least one of an amplitude and a phase of the second differential signal according to a measurement result; and

controlling at least one of the amplitude and the phase of the second differential signal according to a detect result, and controlling the wireless power transmitter based on information on the controlled second differential signal.

2. The method of claim 1, wherein the controlling of the at least one of the amplitude and the phase of the second differential signal comprises controlling at least one of an amplitude and a phase of the first differential signal.

3. The method of claim 1, wherein the information on the controlled second differential signal comprises at least one of voltage values, current values of two signals in the second differential signal, and a phase difference value between the two signals.

4. The method of claim 1, wherein the controlling of the at least one of the amplitude and the phase of the second differential signal comprises maintaining the amplitude and the phase of the second differential signal when an amplitude and a phase of the differential signal are in a certain reference range.

5. The method of claim 1, wherein the controlling of the at least one of the amplitude and the phase of the second differential signal comprises controlling the amplitude and the phase of the second differential signal when an amplitude and a phase of the differential signal are not in a certain reference range.

6. The method of claim 1, wherein the controlling of the wireless power transmitter further comprises determining an impedance change corresponding to the wireless power receiver, based on the information on the controlled second differential signal.

7. The method of claim 1, wherein the controlling of the wireless power transmitter comprises determining an impedance change of the wireless power receiver based on the information on the controlled second differential signal, and entering to a latch fault mode according to a determination result.

8. The method of claim 1, wherein the controlling of the at least one of the amplitude and the phase of the second differential signal comprises controlling at least one of the amplitude and the phase of the second differential signal based on information on wireless power received by the wireless power receiver.

9. The method of claim 8, wherein the controlling of the at least one of the amplitude and the phase of the second differential signal is performed in a period from a time when the wireless power transmitter transmits the wireless power to a time when the information on the wireless power is requested to the wireless power receiver.

10. A wireless power transmitter transmitting wireless power to a wireless power receiver, the wireless power transmitter comprising:

a signal dividing unit configured to output a first differential signal for the wireless power;

a resonating unit configured to transmit the wireless power using a second differential signal corresponding to the first differential signal;

an alternating current (AC) measuring unit configured to measure the second differential signal applied to the resonating unit; and

a controller configured to;

control at least one of an amplitude and a phase of the second differential signal based on a result measured by the AC measuring unit, and

control the wireless power transmitter based on information on the controlled second differential signal.

11. The wireless power transmitter of claim 10, wherein the controller is further configured to control the signal dividing unit such that the signal dividing unit controls at least one of an amplitude and a phase of the first differential signal in order to control at least one of the amplitude and the phase of the second differential signal.

12. The wireless power transmitter of claim 11, wherein the controller is further configured to control a variable resistor in order to control at least one of the amplitude and the phase of the first differential signal.

13. The wireless power transmitter of claim 10, wherein the information on the controlled second differential signal comprises at least one of voltage values, current values of two signals in the second differential signal, and a phase difference value between the two signals.

14. The wireless power transmitter of claim 10, wherein the controller is further configured to determine an impedance change corresponding to the wireless power receiver, based on the information on the controlled second differential signal.

15. The wireless power transmitter of claim 10, wherein the controller is further configured to:

determine an impedance change of the wireless power receiver, based on the information on the controlled second differential signal, and

determine an entrance-or-not into a latch fault mode according to a determination result.

16. The wireless power transmitter of claim 10, wherein the controller is further configured to control at least one of the amplitude and the phase of the second differential signal, based on information on the wireless power received from the wireless power receiver.

17. The wireless power transmitter of claim 16, wherein the controller is further configured to control at least one of the amplitude and the phase of the second differential signal in a period from a time when the wireless power transmitter transmits the wireless power to a time when the information on the wireless power is requested to the wireless power receiver.

18. The wireless power transmitter of claim 10, wherein the controller is further configured to:

determine an impedance change of the wireless power receiver, and

initialize the wireless power transmitter according to a determination result.

19. The wireless power transmitter of claim 10, further comprising:

a memory configured to store the information on the second differential signal.