Wireless power transmission apparatus

• US 10,326,315 B2
• Filed: 10/05/2015
• Issued: 06/18/2019
• Est. Priority Date: 12/10/2014
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Bae, Su Ho, Park, Yu Ri
• Primary Examiner(s): Kaplan, Hal
• Application Number:
  US15/534,899
• Publication Number:
  US 20170338696A1
• Time in Patent Office: 1,352 Days
• Field of Search: 307104
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence

Abstract

A wireless power transmission apparatus according to an embodiment of the present invention includes a resonance-type coil unit, an induction-type coil unit, and a loss suppression unit including a serial resonant circuit connected to both ends of the induction-type coil unit, wherein the loss suppression unit resonates at a first frequency for driving the resonance-type coil unit. A wireless power transmission apparatus according to another embodiment of the present invention includes a resonance-type coil unit, an induction-type coil unit, and a switch element connected to both ends of the induction-type coil unit, wherein the switch element is turned on or off when power is transmitted by either of the resonance-type coil unit or the induction-type coil unit.

Claims

1. A wireless power transmission apparatus comprising:

a resonance-type coil unit;

an induction-type coil unit; and

a loss suppression unit comprising a serial resonant circuit connected to both ends of the induction-type coil unit,

wherein the loss suppression unit resonates at a first frequency for driving the resonance-type coil unit.

2. The wireless power transmission apparatus of claim 1, wherein the serial resonant circuit comprises at least one capacitor and at least one inductor.

3. The wireless power transmission apparatus of claim 1, wherein the loss suppression unit has an impedance magnitude equal to or greater than an impedance magnitude preset at a second frequency for driving the induction-type coil unit.

4. The wireless power transmission apparatus of claim 3, further comprising:

a first DC/AC conversion unit configured to convert a first DC signal and transfer an AC signal having the first frequency to the resonance-type coil unit; and

a second DC/AC conversion unit configured to convert a second DC signal and transfer an AC signal having the second frequency to the induction-type coil unit.

5. The wireless power transmission apparatus of claim 4, further comprising a control unit configured to control operations of the first and second DC/AC conversion units,

wherein the control unit enables the first DC/AC conversion unit and disables the second DC/AC conversion unit so that the first DC/AC conversion unit is controlled to transfer the AC signal having the first frequency to the resonance-type coil unit, and enables the second DC/AC conversion unit and disables the first DC/AC conversion unit so that the second DC/AC conversion unit is controlled to transfer the AC signal having the second frequency to the induction-type coil unit.

6. The wireless power transmission apparatus of claim 4, further comprising an AC/DC conversion unit configured to receive an AC signal and supply the first and second DC signals to the first and second DC/AC conversion units,

wherein the first DC/AC conversion unit comprises:

a first high-frequency filter unit connected between the AC/DC conversion unit and a first node;

a second high-frequency filter unit connected between the AC/DC conversion unit and a second node;

a first switch connected between the first node and a third node; and

a second switch connected between the second node and the third node,

wherein the resonance-type coil unit is connected between the first node and the second node.

7. The wireless power transmission apparatus of claim 4, further comprising an AC/DC conversion unit configured to receive an AC signal and supply the first and second DC signals to the first and second DC/AC conversion units,

wherein the second DC/AC conversion unit comprises:

a first switch connected between the AC/DC conversion unit and a first node;

a second switch connected between the first node and a third node;

a third switch connected between the AC/DC conversion unit and a second node; and

a fourth switch connected between the second node and the third node,

wherein the induction-type coil unit is connected between the first node and the second node.

8. The wireless power transmission apparatus of claim 3, wherein the first frequency is about 6.78 MHz, and the second frequency is about 125 KHz.

9. The wireless power transmission apparatus of claim 1, wherein the loss suppression unit comprises a variable capacitor and a variable inductor connected in series to each other.

10. The wireless power transmission apparatus of claim 9, wherein, when the first frequency is varied, at least one of a capacitance of the variable capacitor and an inductance of the variable inductor is varied.

11. A wireless power transmission apparatus comprising:

a resonance-type coil unit;

an induction-type coil unit; and

a switch element connected to both ends of the induction-type coil unit,

wherein the switch element is turned on or off when power is transmitted by either of the resonance-type coil unit or the induction-type coil unit.

12. The wireless power transmission apparatus of claim 11, wherein the switch element is turned on when power is transmitted by the resonance-type coil unit.

13. The wireless power transmission apparatus of claim 11, wherein the switch element is turned off when power is transmitted by the induction-type coil unit.

14. The wireless power transmission apparatus of claim 13, further comprising:

a first DC/AC conversion unit configured to convert a first DC signal and transfer an AC signal having a first frequency to the resonance-type coil unit; and

a second DC/AC conversion unit configured to convert a second DC signal and transfer an AC signal having a second frequency to the induction-type coil unit.

15. The wireless power transmission apparatus of claim 14, further comprising a control unit configured to control operations of the first and second DC/AC conversion units and an operation of the switch element,

wherein the control unit enables the first DC/AC conversion unit and disables the second DC/AC conversion unit so that the first DC/AC conversion unit is controlled to transfer the AC signal having the first frequency to the resonance-type coil unit, and

the control unit turns on the switch element.

16. The wireless power transmission apparatus of claim 14, further comprising a control unit configured to control operations of the first and second DC/AC conversion units,

wherein the control unit enables the second DC/AC conversion unit and disables the first DC/AC conversion unit so that the second DC/AC conversion unit is controlled to transfer the AC signal having the second frequency to the induction-type coil unit, and

the control unit turns off the switch element.

17. The wireless power transmission apparatus of claim 14, further comprising an AC/DC conversion unit configured to receive an AC signal and supply the first and second DC signals to the first and second DC/AC conversion units,

wherein the first DC/AC conversion unit comprises:

a first high-frequency filter unit connected between the AC/DC conversion unit and a first node;

a second high-frequency filter unit connected between the AC/DC conversion unit and a second node;

a first switch connected between the first node and a third node; and

a second switch connected between the second node and the third node,

wherein the resonance-type coil unit is connected between the first node and the second node.

18. The wireless power transmission apparatus of claim 14, further comprising an AC/DC conversion unit configured to receive an AC signal and supply the first and second DC signals to the first and second DC/AC conversion units,

wherein the second DC/AC conversion unit comprises:

a first switch connected between the AC/DC conversion unit and a first node;

a second switch connected between the first node and a third node;

a third switch connected between the AC/DC conversion unit and a second node; and

a fourth switch connected between the second node and the third node,

wherein the induction-type coil unit is connected between the first node and the second node.

19. The wireless power transmission apparatus of claim 11, wherein, when the resonance-type coil unit is driven, an AC signal having a frequency of about 6.78 MHz is supplied to the resonance-type coil unit.

20. The wireless power transmission apparatus of claim 11, wherein, when the induction-type coil unit is driven, an AC signal having a frequency of about 125 KHz is supplied to the induction-type coil unit.