METHOD FOR CONTROL IN WIRELESS POWER TRANSFER SYSTEMS

• US 20170250573A1
• Filed: 07/15/2015
• Published: 08/31/2017
• Est. Priority Date: 07/15/2014
• Status: Active Grant

• Current Assignee: Pantech Wireless, LLC (Ideahub, Inc.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: OLYUNIN, Nikolay Nikolayevich, CHERNOKALOV, Alexander Gennadevich
• Granted Patent: US 10,476,306 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02M 7/5388 with asymmetrical configuration of switches

Abstract

Claimed is a method for control in wireless power transfer systems and a wireless power transfer system implementing such method. The system comprises a transmitting inductor; a receiving inductor spaced apart from the transmitting inductor; a half bridge inverting circuit or a full bridge inverting circuit with constant switching frequency for driving the current in the transmitting inductor, wherein said half bridge inverting circuit comprises at least two switches, or said full bridge inverting circuit comprises at least two diagonal pairs of switches. The switches or diagonal pairs of switches are configured to be turned on complementarily, and the current amplitude in the transmitting inductor is controlled by varying the difference between the on-times of said switches. The claimed method and system provide efficient power transfer in conditions of variable load and/or variable input voltage and/or variable coupling between Tx and Rx parts.

Claims

1. A transmitting device of a wireless power transfer system for transmitting a power to a spatially separated receiving device, the transmitting device comprising:

a transmitting inductor;

a inverter is configured to drive a current to the transmitting inductor, the current is an AC output inverted from an DC input by using a plurality of switches; and

a controller is configured to control the plurality of switches to be switched complementarily;

wherein the controller controls the plurality of switches to be switched in a constant frequency, and regulates an amplitude of the current by varying a difference of duty cycles between the switches being complementarily switched.

2. The transmitting device of claim 1, wherein the inverter is configured by a half-bridge inverting circuit or a full-bridge inverting circuit.

3. The transmitting device of claim 1, wherein the plurality of switches are configured by power transistors, and the controller includes at least one of gate driver for switching the plurality of switches.

4. The transmitting device of claim 1, wherein the controller varies the difference of the duty cycles depends on the input DC voltage

5. The transmitting device of claim 1, wherein the controller varies the difference of the duty cycles depends on amount of power consumed by the receiving device.

6. The transmitting device of claim 1, wherein the controller varies the difference of the duty cycles depends on amount of coupling between the transmitting inductor and an receiving inductor of the receiving device.

7. The transmitting device of claim 1, wherein the controller varies the difference of the duty cycles depends on a distance between the transmitting device and the receiving device.

8. A method for controlling a transmitting device of a wireless power transfer system for transmitting a power to a spatially separated receiving device, the method comprising:

inputting a direct current (DC);

inverting the inputted DC to an alternating current (AC) as an output by complementary switching a plurality of switches in a constant frequency;

driving the AC output to a transmitting inductor of the transmitting device; and

varying a difference of duty cycles between the switches being complementarily switched for regulating an amplitude of the current.

9. The method of claim 8, wherein the inverting is operated by a half-bridge inverting circuit or a full-bridge inverting circuit.

10. The method of claim 8, wherein the plurality of switches are configured by power transistors, and the switching is operated by at least one of gate driver.

11. The method of claim 8, wherein the difference of duty cycles is varied depending on the input DC voltage.

12. The method of claim 8, wherein the difference of duty cycles is varied depending on amount of power consumed by the receiving apparatus.

13. The method of claim 8, wherein the difference of duty cycles is varied depending on amount of coupling between the transmitting inductor and an receiving inductor of the receiving apparatus.

14. The method of claim 8, wherein the difference of duty cycles is varied depending on a distance between the transmitting apparatus and the receiving apparatus.