POWER SUPPLY APPARATUS AND POWER CONTROL METHOD THEREOF

• US 20130313911A1
• Filed: 05/24/2013
• Published: 11/28/2013
• Est. Priority Date: 05/25/2012
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: BAE, Su Ho
• Granted Patent: US 9,773,609 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• 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 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

Disclosed is a power supply apparatus of a wireless power transmitting apparatus wirelessly transmitting power to a wireless power receiving apparatus. The power supply apparatus includes a power supply to supply DC power, an oscillator to generate an AC signal having a predetermined frequency and an AC power generator to generate AC power using the AC signal and the DC power. The power supply apparatus controls an operating time of the AC power generator to adjust the power supplied to the wireless power transmitting apparatus.

Claims

1. A power supply apparatus of a wireless power transmitting apparatus wirelessly transmitting power to a wireless power receiving apparatus, the power supply apparatus comprising:

a power supply to supply DC power;

an oscillator to generate an AC signal having a predetermined frequency; and

an AC power generator to generate AC power using the AC signal and the DC power,

wherein the power supply apparatus controls an operating time of the AC power generator to adjust the power supplied to the wireless power transmitting apparatus.

2. The power supply apparatus of claim 1, wherein the power supply apparatus adjusts the operating time of the AC power generator based on a coupling state between the wireless power transmitting apparatus and the wireless power receiving apparatus wirelessly receiving the power from the wireless power transmitting apparatus.

3. The power supply apparatus of claim 1, wherein the power supply apparatus adjusts the operating time to increase the power supplied to the wireless power transmitting apparatus when a magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is reduced, and adjusts the operating time to reduce the power supplied to the wireless power transmitting apparatus when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is increased.

4. The power supply apparatus of claim 1, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a low level is applied to both of the first MOSFET and the second MOSFET.

5. The power supply apparatus of claim 4, wherein the operating time is a time during which one of AC signals applied to the first MOSFET and the second MOSFET has a high level to supply the power to the wireless power transmitting apparatus.

6. The power supply apparatus of claim 1, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a high level is applied to both of the first MOSFET and the second MOSFET.

7. The power supply apparatus of claim 4, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is reduced, and increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is increased.

8. The power supply apparatus of claim 4, further comprising a power transmissions state detector to detect the coupling state.

9. The power supply apparatus of claim 8, wherein the power transmissions state detector comprises a current sensor to measure current flowing through the power supply apparatus, and the current flowing through the power supply apparatus is one of current applied to the AC power generator and current output from the AC power generator.

10. The power supply apparatus of claim 9, wherein the power supply apparatus increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is increased.

11. The power supply apparatus of claim 9, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is reduced.

12. The power supply apparatus of claim 1, wherein the power supply apparatus adjusts the operating time according to variation of current flowing through the power supply apparatus.

13. The power supply apparatus of claim 2, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a low level is applied to both of the first MOSFET and the second MOSFET.

14. The power supply apparatus of claim 3, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a low level is applied to both of the first MOSFET and the second MOSFET.

15. The power supply apparatus of claim 13, wherein the operating time is a time during which one of AC signals applied to the first MOSFET and the second MOSFET has a high level to supply the power to the wireless power transmitting apparatus.

16. The power supply apparatus of claim 14, wherein the operating time is a time during which one of AC signals applied to the first MOSFET and the second MOSFET has a high level to supply the power to the wireless power transmitting apparatus.

17. The power supply apparatus of claim 2, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a high level is applied to both of the first MOSFET and the second MOSFET.

18. The power supply apparatus of claim 3, wherein the AC power generator comprises:

a first MOSFET;

a second MOSFET; and

a driver applying AC signals having a same amplitude and opposite phases to the first MOSFET and the second MOSFET, respectively, and

the driver adjusts a time during which the AC signal of a high level is applied to both of the first MOSFET and the second MOSFET.

19. The power supply apparatus of claim 13, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is reduced, and increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is increased.

20. The power supply apparatus of claim 14, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is reduced, and increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when the magnetic coupling between the wireless power transmitting apparatus and the wireless power receiving apparatus is increased.

21. The power supply apparatus of claim 13, further comprising a power transmissions state detector to detect the coupling state.

22. The power supply apparatus of claim 14, further comprising a power transmissions state detector to detect the coupling state.

23. The power supply apparatus of claim 21, wherein the power transmissions state detector comprises a current sensor to measure current flowing through the power supply apparatus, and the current flowing through the power supply apparatus is one of current applied to the AC power generator and current output from the AC power generator.

24. The power supply apparatus of claim 22, wherein the power transmissions state detector comprises a current sensor to measure current flowing through the power supply apparatus, and the current flowing through the power supply apparatus is one of current applied to the AC power generator and current output from the AC power generator.

25. The power supply apparatus of claim 23, wherein the power supply apparatus increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is increased.

26. The power supply apparatus of claim 24, wherein the power supply apparatus increases the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is increased.

27. The power supply apparatus of claim 23, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is reduced.

28. The power supply apparatus of claim 24, wherein the power supply apparatus reduces the time during which the AC signal of the low level is applied to both of the first MOSFET and the second MOSFET when a measured intensity of current is reduced.