Wireless power transmitter and wireless power transceiver

• US 9,099,878 B2
• Filed: 09/14/2011
• Issued: 08/04/2015
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Kwang Du, Lee, Duk Woo, Kim, Jeong Hoon, Yoon, Young Seok, Kim, Tae Sung, Kim, Eung Ju, Hwang, Sang Hoon, Park, Chul Gyun, Yoon, Jung Ho
• Primary Examiner(s): Cavallari, Daniel
• Application Number:
  US13/232,482
• Publication Number:
  US 20120242158A1
• Time in Patent Office: 1,420 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

Disclosed are a wireless power transmitter capable of transmitting power wirelessly according to an impedance of an output side and a wireless power transceiver. There are provided a wireless power transmitter and a wireless power transceiver including: a wireless power transmitting unit converting input power into a preset transmission power and transmitting the converted input power wirelessly; and a controlling unit controlling a transmission of the transmission power according to a level of output impedance of the transmission power output from the wireless power transmitting unit.

Claims

1. A wireless power transmitter, comprising:

a wireless power transmitting unit converting an input power into a preset transmission power and transmitting the converted input power wirelessly,

wherein the wireless power transmitting unit comprises;

(a) an oscillator oscillating the input power at a preset resonance frequency;

(b) a switching part coupled to the oscillator and providing two paths for the power oscillated by the oscillator depending upon switching thereof;

(c) a power amplifier inserted in one of the two paths and amplifying the power supplied from the oscillator when the switching part switches to the path in which the power amplifier is inserted; and

(d) a resonator resonating the power oscillated by the oscillator or the power amplified by the power amplifier at the resonance frequency and transmitting the power wirelessly by performing impedance matching; and

a controlling unit comprising detectors detecting a level of output impedance of the transmission power outputted from the wireless power transmitting unit and controlling a transmission of the transmission power according to the level of output impedance of the transmission power output from the wireless power transmitting unit.

2. The wireless power transmitter of claim 1, wherein the wireless power transmitting unit further includes a path providing part providing the two paths, one of which is a path of the power transferred to the resonator and the other of which is a path of the power reflected by impedance mismatch.

3. The wireless power transmitter of claim 2, wherein the detectors include a first detector detecting a current level of the input power input to the oscillator;

and a second detector detecting a power level of the reflected power, and the controlling unit includes a switching controller controlling the switching of the path performed by the switching part according to detection signals of the first detector and the second detector.

4. The wireless power transmitter of claim 3, wherein the first detector includes at least one detection resistor connected between a driving power end supplying a preset driving power and the oscillator in series.

5. The wireless power transmitter of claim 3, wherein the second detector includes:

a pin diode receiving the reflected power;

an inductor connected to the pin diode in series and outputting the detection signals;

a capacitor connected between a connection point of the pin diode and the inductor and a ground in series; and

a resistor connected between an output end of the inductor and the ground in series.

6. The wireless power transmitter of claim 3, wherein the switching controller is an exclusive NOR gate operating exclusive NOR on the detection signals from the first detector and the second detector.

7. The wireless power transmitter of claim 1, wherein the wireless power transmitting unit further includes a power converter converting commercial AC power into DC power and providing the converted DC power as the input power, and the output of the power converter is inputted into the oscillator.

8. The wireless power transmitter of claim 1, wherein the detectors include a detector detecting a current level of the input power input to the oscillator, and the controlling unit includes a switching controller controlling the switching of the path performed by the switching part according to a detection signal of the detector.

9. The wireless power transmitter of claim 8, wherein the detector includes at least one detection resistor connected between a driving power end supplying a preset driving power and the oscillator in series.

10. The wireless power transmitter of claim 1, wherein the wireless power transmitting unit transmits the transmission power by a magnetic resonance method.

11. The wireless power transmitter of claim 1, wherein the wireless power transmitting unit transmits the transmission power by a magnetic induction method.

12. The wireless power transmitter of claim 1, further comprising a communications unit communicating with a wireless power receiver receiving the transmission power by a previously established communications method.

13. A wireless power transceiver, comprising:

a wireless power transmitter having a wireless power transmitting unit converting input power into a preset transmission power and transmitting the converted input power wirelessly, wherein the wireless power transmitting unit comprises;

(a) an oscillator oscillating the input power at a preset resonance frequency;

(b) a switching part coupled to the oscillator and providing two paths for the power oscillated by the oscillator depending upon switching thereof;

(c) a power amplifier inserted in one of the two paths and amplifying the power supplied from the oscillator when the switching part switches to the path in which the power amplifier is inserted; and

(d) a resonator resonating the power oscillated by the oscillator or the power amplified by the power amplifier at the resonance frequency and transmitting the power wirelessly by performing impedance matching; and

a controlling unit comprising detectors detecting a level of output impedance of the transmission power outputted from the wireless power transmitting unit and controlling a transmission of the transmission power according to the level of output impedance of the transmission power output from the wireless power transmitting unit; and

a wireless power receiver charged by being supplied with the transmission power from the wireless power transmitter.

14. The wireless power transceiver of claim 13, wherein the wireless power transmitting unit further includes a path providing part providing the two paths one of which is a path of the power transferred to the resonator and the other of which is a path of the power reflected by impedance mismatch.

15. The wireless power transceiver of claim 14, wherein the detectors include a first detector detecting a current level of the input power input to the oscillator;

and a second detector detecting a power level of the reflected power, and the controlling unit includes a switching controller controlling the switching of the path performed by the switching part according to detection signals of the first detector and the second detector.

16. The wireless power transceiver of claim 15, wherein the first detector includes at least one detection resistor connected between a driving power end supplying a preset driving power and the oscillator in series.

17. The wireless power transceiver of claim 15, wherein the second detector includes:

a pin diode receiving the reflected power;

an inductor connected to the pin diode in series and outputting the detection signals;

a capacitor connected between a connection point of the pin diode and the inductor and a ground in series; and

a resistor connected between an output end of the inductor and the ground in series.

18. The wireless power transceiver of claim 15, wherein the switching controller is an exclusive NOR gate operating exclusive NOR on the detection signals from the first detector and the second detector.

19. The wireless power transceiver of claim 13, wherein the wireless power transmitting unit further includes a power converter converting commercial AC power into DC power and providing the converted DC power as the input power, and the output of the power converter is inputted into the oscillator.

20. The wireless power transceiver of claim 13, wherein the detectors include a detector detecting a current level of the input power input to the oscillator, and the controller includes a switching controller controlling the switching of the path performed by the switching part according to a detection signal of the detector.

21. The wireless power transceiver of claim 20, wherein the detector includes at least one detection resistor connected between a driving power end supplying a preset driving power and the oscillator in series.

22. The wireless power transceiver of claim 13, wherein the wireless power transmitting unit transmits the transmission power by a magnetic resonance method.

23. The wireless power transceiver of claim 13, wherein the wireless power transmitting unit transmits the transmission power by a magnetic induction method.

24. The wireless power transceiver of claim 13, wherein the wireless power receiver includes:

a wireless power receiving unit supplied with the transmission power and converting the received transmission power into a preset driving power; and

a charging unit allowing the driving power from the wireless power receiving unit to be charged.

25. The wireless power transceiver of claim 24, wherein the wireless power transmitter further includes a first communications unit communicating with the wireless power receiver by a previously established communications method.

26. The wireless power transceiver of claim 25, wherein the wireless power receiver further includes a second communications unit being woken up by the wireless power receiving unit and communicating with the first communications unit.