Multi-level power compatible wireless power receiving apparatus

Patent metadata

Field	Value
Publication number	US-2021075270-A1
Application number	US-202016739749-A
Country	US
Kind code	A1
Filing date	Jan 10, 2020
Priority date	Sep 9, 2019
Publication date	Mar 11, 2021
Grant date	—

Abstract

The present disclosure relates to a wireless power receiving apparatus capable of receiving multi-level power transmitted by a wireless power transmitting apparatus. According to an embodiment of the present disclosure, the wireless power receiving apparatus includes a first receiving coil in which induced current is generated by electromagnetic induction, a second receiving coil connected in series with the first receiving coil by a switch, and a processor that is driven based on the induced current generated by the first receiving coil and controls the switch based on power information included in the induction current to selectively connect the first receiving coil and the second receiving coil.

First claim

What is claimed is:

1 . A wireless power receiving apparatus for receiving multi-level power, comprising:
a first receiving coil in which induction current is generated based on an electromagnetic induction; a second receiving coil configured to be selectively connected to the first receiving coil in series, by a switch; and a processor that is driven based on the induction current generated by the first receiving coil, controls the switch based on power information included in the induction current, and selectively and electrically connects the first receiving coil and the second receiving coil based on an operation of the switch.

2 . The wireless power receiving apparatus of claim 1 , wherein a center of the first receiving coil and a center of the second receiving coil are the same or substantially the same.

3 . The wireless power receiving apparatus of claim 1 , wherein the first receiving coil is disposed within an inner area of the second receiving coil.

4 . The wireless power receiving apparatus of claim 1 , wherein an area surrounded by an outer edge of the first receiving coil is disposed within an area surrounded by an inner edge of the second receiving coil.

5 . The wireless power receiving apparatus of claim 1 , wherein the first receiving coil and the second receiving coil have substantially circular or rectangular shapes having the same center, and
an outer diameter of the first receiving coil is less than an inner diameter of the second receiving coil.

6 . The wireless power receiving apparatus of claim 1 , wherein current is induced into the first receiving coil when the first receiving coil is electrically separated from the second receiving coil by the switch, or
wherein current is induced into the first receiving coil and the second receiving coil when the first receiving coil is electrically connected to the second receiving coil by the switch.

7 . The wireless power receiving apparatus of claim 1 , further comprising:
a third receiving coil configured to be selectively connected to the second receiving coil by another switch, wherein the processor selectively and electrically connects the first, second and third receiving coils by the switches.

8 . The wireless power receiving apparatus of claim 1 , wherein the first receiving coil is connected to a first resonance capacitor, and the second receiving coil is connected to a second resonance capacitor.

9 . The wireless power receiving apparatus of claim 8 , wherein the first receiving coil and the first resonance capacitor form a first resonance circuit, when the first receiving coil is electrically separated from the second receiving coil by the switch,

10 . The wireless power receiving apparatus of claim 9 , wherein the first receiving coil, the second receiving coil and the second resonance capacitor form a second resonance circuit, when the first receiving coil is electrically connected to the second receiving coil by the switch.

11 . The wireless power receiving apparatus of claim 10 , wherein a resonance frequency of the first resonance circuit and a resonance frequency of the second resonance circuit are the same or substantially the same.

12 . The wireless power receiving apparatus of claim 8 , wherein a capacitance of the second resonance capacitor is less than a capacitance of the first resonance capacitor.

13 . The wireless power receiving apparatus of claim 1 , wherein the first receiving coil and the processor are connected through a full-bridge rectifying circuit.

14 . The wireless power receiving apparatus of claim 13 , wherein a current induced into the first receiving coil is provided to the processor through the full-bridge rectifying circuit.

15 . The wireless power receiving apparatus of claim 13 , wherein the second receiving coil and the processor are connected through a half-bridge rectifying circuit.

16 . The wireless power receiving apparatus of claim 15 , wherein a current induced into both the first receiving coil and the second receiving coil is provided to the processor through any one of legs of the full-bridge rectifying circuit and the half-bridge rectifying circuit.

17 . The wireless power receiving apparatus of claim 1 , further comprising a DC link capacitor,
wherein a current induced into at least one of the first receiving coil and the second receiving coil is stored as a DC link voltage in the DC link capacitor, and the processor is driven based on the DC link voltage.

18 . The wireless power receiving apparatus of claim 17 , further comprising a regulator,
wherein the DC link voltage is converted into a drive voltage by the regulator, and the processor is driven based on the drive voltage.

19 . The wireless power receiving apparatus of claim 1 , wherein the processor identifies the power information based on a frequency modulated signal included in the induction current after the processor is driven based on the induction current.

20 . The wireless power receiving apparatus of claim 1 , wherein the processor determines an amount of transmitted power based on the power information, and
wherein in response to the amount of transmitted power being less than a reference magnitude, the processor controls the switch to be turned off to electrically disconnect the first and second receiving coils from each other, and in response to the amount of transmitted power being equal to greater than the reference magnitude, the processor controls the switch to be turned on to electrically connect the first and second receiving coils to each to other.

Assignees

• Lg Electronics Inc

Inventors

• Choi Hyengcheul
• Kwak Bongsik
• Lee Seong Hun

Classifications

• H02J50/005

  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 title

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F17/02

  without magnetic core · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title