RECEIVED POWER CONVERSION DEVICE FOR RESONANT WIRELESS CHARGING SYSTEM

• US 20130099591A1
• Filed: 10/24/2012
• Published: 04/25/2013
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: Yeo, Sung-Ku, Cho, Gyu-Hyeong, Park, Se-Ho, Kim, Se-Ki, Lee, Young-Min, Choi, Jun-Han
• Granted Patent: US 9,391,535 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

Provided is a received power conversion device for a resonant wireless charging system, including a wireless power receiver for receiving wireless power from a wireless power transmission device, a rectifier for rectifying power in an Alternating Current (AC) form received in the wireless power receiver into a Direct Current (DC), a free-wheeling switching unit for switching according to a switching control signal to form a path for free-wheeling the power in the AC form, a feedback circuit fed back with an output signal of a corresponding power conversion device to detect a level of the output signal, and a controller for controlling switching of the free-wheeling switching unit according to the output level detected by the feedback circuit.

Claims

1. A received power conversion device for a resonant wireless charging system, the received power conversion device comprising:

a wireless power receiver for receiving wireless power transmitted from a wireless power transmission device;

a rectifier for rectifying power in an Alternating Current (AC) form received in the wireless power receiver into a Direct Current (DC);

a free-wheeling switching unit for performing a switching operation according to a switching control signal and forming a path for free-wheeling the power in the AC form received in the wireless power receiver;

a feedback circuit fed back with an output signal of a corresponding power conversion device and detecting a level of the output signal; and

a controller for controlling a switching operation of the free-wheeling switching unit according to the output level detected by the feedback circuit.

2. The received power conversion device of claim 1, wherein the wireless power receiver comprises a second coil for absorbing electric waves emitted from a first coil of the wireless power transmission device and a resonant first capacitor serially connected with the second coil.

3. The received power conversion device of claim 1, wherein the free-wheeling switching unit comprises a first switching transistor for performing on/off operations under control of the controller.

4. The received power conversion device of claim 2, wherein the rectifier comprises a single first diode provided with power from the wireless power receiver to output the provided power, and

in the wireless power receiver, one terminal and another terminal of a serial connection circuit of the second coil and the first capacitor are connected with the first diode and a ground end of the rectifier, respectively.

5. The received power conversion device of claim 2, wherein the rectifier has a structure in which a serial connection circuit of the first diode and the second diode and a serial connection circuit of the third diode and the fourth diode are connected in parallel with each other, and

a connection node of the first diode and the third diode is set to be an output node and a connection node of the second diode and the fourth diode is connected with the ground end, and

one terminal and another terminal of a serial connection circuit of the second coil and the first capacitor of the wireless power receiver are connected with a connection point of the first diode and the second diode and a connection point of the third diode and the fourth diode, respectively.

6. The received power conversion device of claim 2, wherein the rectifier has a structure in which a serial connection circuit of the first diode and the second diode and a serial connection circuit of a second capacitor and a third capacitor are connected in parallel with each other, and

a connection node of the first diode and the second capacitor is set to be an output node and a connection node of the second diode and the third capacitor is connected with the ground end, and

one terminal and another terminal of a serial connection circuit of the second coil and the first capacitor of the wireless power receiver are connected with a connection point of the first diode and the second capacitor and a connection point of the second diode and the third capacitor, respectively.

7. The received power conversion device of claim 2, wherein the rectifier has a structure in which a serial connection circuit of a second switching transistor and a third switching transistor and a serial connection circuit of a second capacitor and a third capacitor are connected in parallel with each other, and

a connection node of the second switching transistor and the second capacitor is set to be an output node and a connection node of the third switching transistor and the third capacitor is connected with the ground end, and

one terminal and another terminal of a serial connection circuit of the second coil and the first capacitor of the wireless power receiver are connected with a connection point of the second switching transistor and the second capacitor and a connection point of the third switching transistor and the third capacitor, respectively.

8. The received power conversion device of claim 7, wherein the second switching transistor and the third switching transistor comprise Metal Oxide Semiconductor Field Effect Transistors (MOSFETs).

9. The received power conversion device of claim 1, wherein the feedback circuit is implemented with a comparator which is fed back with an output signal of a corresponding power conversion device, compares the output signal with a reference voltage, and outputs a comparison result.

10. The received power conversion device of claim 1, wherein the controller comprises:

a sync signal generator provided with a signal received in the wireless power receiver and generating a corresponding sync signal; and

a driving unit for generating, as the switching control signal, a driving signal for on/off control of the free-wheeling switching unit according to an output of the feedback circuit in synchronization with the sync signal generated by the sync signal generator.

11. The received power conversion device of claim 1, further comprising:

a waveform stabilizer comprising an inductor and a capacitor and stabilizing and outputting a DC waveform of an output end of a corresponding power conversion device; and

a Zener diode for circuit protection and a third capacitor for power charging and stabilization, which are connected in parallel between the rectifier and the waveform stabilizer.