Wireless power receiver
An electronic device is provided that includes a housing and a power receiver disposed within the housing. The power receiver includes a conductive pattern for receiving power wirelessly. The conductive pattern includes a main coil having a plurality of turns, a first sub-coil formed at an input port of the main coil, and a second sub-coil formed at an output port of the main coil. The electronic device also includes a controller configured to control to receive power using the conductive pattern.
1. An electronic device comprising:
a housing;
a rectifier configured to rectify power provided through a first port and a second port of a power receiving circuit; and
the power receiving circuit disposed within the housing and including a conductive pattern for wirelessly receiving the power, the conductive pattern comprising:
a main coil,
a first sub-coil, wherein a first end of the first sub-coil is connected to a first end of the main coil and a second end of the first sub-coil is connected to the first port, and
a second sub-coil, wherein a first end of the second sub-coil is connected to a second end of the main coil and a second end of the second sub-coil is connected to the second port.
2. The electronic device of claim 1 , wherein each of the first sub-coil and the second-sub-coil has a resonance frequency similar to a resonance frequency measured after the main coil is disposed, the first sub-coil is connected serially to the first port, and the second sub-coil is connected serially to the second port.
3. The electronic device of claim 2 , wherein the first end and the second end of the first sub-coil are connected to a first capacitor, and the first end and the second end of the second sub-coil are connected to a second capacitor for controlling a resonance frequency.
4. The electronic device of claim 2 , wherein the first end and the second end of the first sub-coil are connected to a first variable inter-digital capacitor, and the first end and the second end of the second sub-coil are connected to a second variable inter-digital capacitor, for controlling a resonance frequency.
5. The electronic device of claim 2 , wherein the first end and the second end of the first sub-coil are connected to a first resistor, and the first end and the second end of the second sub-coil are connected to a second resistor, for controlling a resonance frequency.
6. The electronic device of claim 1 , wherein each of the first sub-coil and the second sub-coil comprises at least two turns, and the first sub-coil is shaped into a spire that is larger than the second sub-coil.
7. The electronic device of claim 6 , wherein the first sub-coil is different from the second sub-coil in at least one of size, number of turns, and turn interval.
8. The electronic device of claim 6 , wherein:
a dependent coil is formed within the first sub-coil,
wherein the dependent coil comprises at least two turns, and
the dependent coil is not connected to the first sub-coil.
9. The electronic device of claim 1 , wherein the first port and the second port are connected to a first capacitor and a second capacitor for controlling a resonance frequency.
10. The electronic device of claim 9 , wherein the first capacitor is connected in parallel to the first end of the first sub-coil and the first end of the second sub-coil, and the second capacitor is connected in parallel to the second end of the first sub-coil and the second end of the second sub-coil.
11. The electronic device of claim 1 , wherein the first port and the second port of the main coil are connected to a first variable inter-digital capacitor and a second variable inter-digital capacitor for controlling a resonance frequency.
12. The electronic device of claim 11 , wherein the first variable inter-digital capacitor is connected in parallel to the first end of the first sub-coil and the first end of the second sub-coil, and the second variable inter-digital capacitor is connected in parallel to the second end of the first sub-coil and the second end of the second sub-coil.
13. The electronic device of claim 1 , wherein the main coil, the first sub-coil, and the second sub-coil are wound in the same direction.
14. The electronic device of claim 1 , wherein the controller is further configured to sense radiation of electromagnetic waves generated during conversion of the power to direct current.
15. The electronic device of claim 14 , wherein the first sub-coil and the second sub-coil are formed at positions at which the radiation of the generated electromagnetic waves is minimized.