POWER SUPPLY DEVICE

• US 20150061403A1
• Filed: 08/29/2014
• Published: 03/05/2015
• Est. Priority Date: 08/30/2013
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: JEONG, In Wha, KIM, Hak Ryong, KIM, Hugh, KANG, Moo Jong
• Granted Patent: US 10,122,212 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 7/02 for charging batteries from ac mains by converters

Abstract

A power supply device may be capable of wirelessly transmitting power at a plurality of resonance frequencies. The power supply device may include: a power conversion unit converting input power into first power; and a wireless power supply unit varying a switching frequency for switching the first power and wirelessly transmitting the switched first power at at least one of a plurality of resonance frequencies.

Claims

1. A power supply device comprising:

a power conversion unit converting input power into first power; and

a wireless power supply unit varying a switching frequency for switching the first power and wirelessly transmitting the switched first power at at least one of a plurality of resonance frequencies.

2. The power supply device of claim 1, further comprising a controller varying the switching frequency according to feedback information of the power wirelessly transmitted by the wireless power supply unit and selecting at least one of the plurality of resonance frequencies.

3. The power supply device of claim 1, wherein the wireless power supply unit comprises:

a switching unit having at least one switch switching the first power from the power conversion unit; and

a resonance unit resonating according to switching of the switching unit to wirelessly transmit the switched power.

4. The power supply device of claim 3, wherein the switching unit has a half bridge switch including a first switch and a second switch.

5. The power supply device of claim 4, wherein the resonance unit comprises:

a first capacitor connected to a node between the first switch and the second switch of the half bridge switch;

a first power transmission coil connected to the first capacitor in series; and

a second capacitor connected to the first power transmission coil in parallel.

6. The power supply device of claim 5, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the half bridge switch.

7. The power supply device of claim 5, wherein the first power transmission coil and the second capacitor resonate according to a switching frequency of the half bridge switch.

8. The power supply device of claim 3, wherein the switching unit comprises a first half bridge switch and a second half bridge switch receiving the first power from the power conversion unit, separately, wherein the first half bridge switch has a first switch and a second switch connected in series and the second half bridge switch has a third switch and a fourth switch connected in series.

9. The power supply device of claim 8, wherein the resonance unit comprises:

a first capacitor connected to a node between the first switch and the second switch of the first half bridge switch;

a first power transmission coil having one end connected to the first capacitor in series and the other end connected to a node between the third switch and the fourth switch of the second half bridge switch; and

a second capacitor connected to the first power transmission coil in parallel.

10. The power supply device of claim 9, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch or the second half bridge switch.

11. The power supply device of claim 9, wherein the first power transmission coil and the second capacitor resonate according to a switching frequency of the first half bridge switch or the second half bridge switch.

12. The power supply device of claim 8, wherein the first half bridge switch and the second half bridge switch form a single full bridge switch.

13. The power supply device of claim 8, wherein the resonance unit comprises:

a first capacitor connected to the node between the first switch and the second switch of the first half bridge switch;

a second capacitor connected to the node between the third switch and the fourth switch of the second half bridge switch; and

a first power transmission coil connected to the first capacitor and the second capacitor in series.

14. The power supply device of claim 13, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch.

15. The power supply device of claim 13, wherein the first transmission coil and the second capacitor resonate according to a switching frequency of the second half bridge switch.

16. The power supply device of claim 8, wherein the resonance unit comprises:

a first resonance unit comprising a first capacitor connected to the node between the first switch and the second switch of the first half bridge switch; and

a first power transmission coil connected to the first capacitor in series; and

a second resonance unit comprising a second capacitor connected to the node between the third switch and the fourth switch of the second half bridge switch; and

a second power transmission coil connected to the second capacitor in series.

17. The power supply device of claim 16, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch.

18. The power supply device of claim 17, wherein the second transmission coil and the second capacitor resonate according to a switching frequency of the second half bridge switch.

19. The power supply device of claim 3, wherein at least two resonance frequencies of the resonance unit work together with a switching frequency of the switching unit.

20. A power supply device comprising:

a power conversion unit converting input power into first power;

a wired power supply unit stabilizing the first power from the power conversion unit and transmitting the stabilized first power wiredly; and

a wireless power supply unit varying a switching frequency for switching the first power and wirelessly transmitting the switched first power at at least one of a first resonance frequency and a second resonance frequency.

21. The power supply device of claim 20, further comprising a controller varying the switching frequency according to feedback information of the power wirelessly transmitted by the wireless power supply unit and selecting at least one of the first resonance frequency and the second resonance frequency.

22. The power supply device of claim 20, wherein the wireless power supply unit comprises:

a switching unit having at least one switch switching the first power from the power conversion unit; and

a resonance unit resonating according to switching of the switching unit to wirelessly transmit the switched power.

23. The power supply device of claim 22, wherein the switching unit has a half bridge switch including a first switch and a second switch.

24. The power supply device of claim 23, wherein the resonance unit comprises:

a first capacitor connected to a node between the first switch and the second switch of the half bridge switch;

a first power transmission coil connected to the first capacitor in series; and

a second capacitor connected to the first power transmission coil in parallel.

25. The power supply device of claim 24, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the half bridge switch.

26. The power supply device of claim 24, wherein the first power transmission coil and the second capacitor resonate according to a switching frequency of the half bridge switch.

27. The power supply device of claim 22, wherein the switching unit comprises a first half bridge switch and a second half bridge switch receiving the first power from the power conversion unit, separately, wherein the first half bridge switch has a first switch and a second switch connected in series and the second half bridge switch has a third switch and a fourth switch connected in series.

28. The power supply device of claim 27, wherein the resonance unit comprises:

a first capacitor connected to a node between the first switch and the second switch of the first half bridge switch;

a first power transmission coil having one end connected to the first capacitor in series and the other end connected to a node between the third switch and the fourth switch of the second half bridge switch; and

a second capacitor connected to the first power transmission coil in parallel.

29. The power supply device of claim 28, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch or the second half bridge switch.

30. The power supply device of claim 28, wherein the first power transmission coil and the second capacitor resonate according to a switching frequency of the first half bridge switch or the second half bridge switch.

31. The power supply device of claim 27, wherein the first half bridge switch and the second half bridge switch form a single full bridge switch.

32. The power supply device of claim 22, wherein the resonance unit comprises:

a first capacitor connected to the node between the first switch and the second switch of the first half bridge switch;

a second capacitor connected to the node between the third switch and the fourth switch of the second half bridge switch; and

a first power transmission coil connected to the first capacitor and the second capacitor in series.

33. The power supply device of claim 32, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch.

34. The power supply device of claim 32, wherein the first transmission coil and the second capacitor resonate according to a switching frequency of the second half bridge switch.

35. The power supply device of claim 22, wherein the resonance unit comprises:

a first resonance unit comprising a first capacitor connected to the node between the first switch and the second switch of the first half bridge switch; and

a first power transmission coil connected to the first capacitor in series; and

a second resonance unit comprising a second capacitor connected to the node between the third switch and the fourth switch of the second half bridge switch; and

a second power transmission coil connected to the second capacitor in series.

36. The power supply device of claim 35, wherein the first capacitor and the first power transmission coil resonate according to a switching frequency of the first half bridge switch.

37. The power supply device of claim 36, wherein the second transmission coil and the second capacitor resonate according to a switching frequency of the second half bridge switch.

38. The power supply device of claim 22, wherein the first resonance frequency and the second resonance frequency of the resonance unit interwork with a switching frequency of the switching unit.

39. The power supply device of claim 20, wherein the first resonance frequency is formed by LC series resonance.

40. The power supply device of claim 20, wherein the second resonance frequency is formed by LC parallel resonance.

41. A power supply device comprising:

a power conversion unit converting input power into first power; and

a wireless power supply unit varying a switching frequency for switching the first power and wirelessly transmitting the switched first power at a frequency within at least one of a plurality of resonance frequency bands.

42. The power supply device of claim 41, further comprising a controller varying the switching frequency according to feedback information of the power wirelessly transmitted by the wireless power supply unit and selecting at least one of the plurality of resonance frequency bands.

43. The power supply device of claim 41, further comprising a wired power supply unit stabilizing the first power from the power conversion unit and transmitting the stabilized first power wiredly.

44. The power supply device of claim 41, further comprising a DC/DC power conversion unit performing DC/DC conversion on power from the wired power supply unit and transmitting the converted power wiredly.