RESONANCE COUPLING WIRELESS POWER TRANSFER RECEIVER AND TRANSMITTER

• US 20130307344A1
• Filed: 09/13/2012
• Published: 11/21/2013
• Est. Priority Date: 05/16/2012
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: CHEON, Sang Hoon, KIM, Yong Hae, LEE, Myung Lae, KANG, Seung Youl, ZYUNG, Taehyoung
• Application Number:
  US13/614,128
• Publication Number:
  US 20130307344A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current

Abstract

Provided are a wireless power transmission receiver and a system including the same, particularly to a receiver and transmitter transmitting power from one transmitter to a plurality of receivers at the same time by wireless. According to the present invention, the wireless power receiver comprises a receiving coil unit receiving power from a transmitter by a resonance coupling method; and a power receiving unit receiving power from the receiving coil unit to provide the power to a load resistor, wherein an input impedance of the power receiving unit is adjusted according to power consumed by a plurality of receivers. Therefore, power transmission efficiency of the wireless power receiver and transmitter can be improved.

Claims

1. A wireless power receiver comprising:

a receiving coil unit receiving power from a transmitter by a resonance coupling method; and

a power receiving unit receiving power from the receiving coil unit to provide the power to a load resistor,

wherein an input impedance of the power receiving unit is adjusted according to power consumed by a plurality of receivers, and

the wireless power receiver receives power at the same time through a plurality of the receivers using one operation frequency.

2. The wireless power receiver of claim 1, wherein the power receiving unit comprises:

an impedance adjuster adjusting the input impedance; and

an over voltage protector keeping the input impedance at a constant value although resistance of the load resistor is changed.

3. The wireless power receiver of claim 2, wherein the impedance adjuster adjusts the input impedance according to power consumed by the load resistor

4. The wireless power receiver of claim 3, wherein the impedance adjuster increases the input impedance as the load resistor consumes more power.

5. The wireless power receiver of claim 3, wherein the impedance adjuster decreases the input impedance as the load resistor consumes less power.

6. The wireless power receiver of claim 1, wherein the receiving coil unit comprises an inductor connected in series.

7. The wireless power receiver of claim 1, wherein the receiving coil unit comprises two inductors inductively coupled to each other for receiving power.

8. A wireless power transmitter comprising:

a power generation unit generating power using a power source; and

a transmitting coil unit transmitting the power at the same time to a plurality of receivers through an operation frequency by a resonance coupling method,

wherein input impedances of the receivers are adjusted according to power consumed by the receivers, respectively.

9. The wireless power transmitter of claim 8, wherein the wireless power transmitter further comprises a transmission control device adjusting power generation by the power source according to a total amount of power consumed by the receivers.

10. The wireless power transmitter of claim 9, wherein the transmission control device increases power generation by the power source as total power consumption of the receivers increases.

11. The wireless power transmitter of claim 9, wherein the transmission control device decreases power generation by the power source as total power consumption of the receivers decreases.

12. The wireless power transmitter of claim 8, wherein the transmitting coil unit comprises an inductor connected in series.

13. The wireless power transmitter of claim 8, wherein the transmitting coil unit comprises two inductors inductively coupled to each other for receiving power.