WIRELESS CHARGING SYSTEM AND APPARATUS, AND CONTROL METHOD THEREOF

• US 20130127405A1
• Filed: 11/17/2011
• Published: 05/23/2013
• Est. Priority Date: 11/17/2011
• Status: Abandoned Application

• Current Assignee: Lite-On Technology Corporation
• Original Assignee: Lite-On Technology Corporation
• Inventors: Scherer, Helmut, Horst, Dirk, Rumpf, Horst
• Application Number:
  US13/299,217
• Publication Number:
  US 20130127405A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

The invention provides a wireless charging system and a wireless charging apparatus for wirelessly charging a receiving device, and provides a method of controlling the wireless charging apparatus. The wireless charging apparatus comprises a power supply for providing a power voltage; a primary charging core; a switch module for changing the power voltage to an input voltage connected the power supply and the primary charging core so that the primary charging core has a primary current according to the power voltage supplied from the power supply; and a controller connected to the switch module and the primary charging core for measuring the primary current and for outputting a control signal for controlling the power voltage provided from the power supply.

Claims

1. A wireless charging system, comprising:

a charging apparatus, comprising;

a power supply to supply a power voltage;

a switch module connected to the power supply to change the power voltage to an input voltage;

a primary charging core connected to the switch module and having a primary current according to the input voltage provided from the switch module; and

a controller connected to the switch module and the primary charging core, the controller is configured to measure the primary current and to output a control signal for controlling the power voltage provided from the power supply; and

a receiving device to be placed opposite to the charging apparatus to perform wireless charging, the receiving device comprising;

a secondary charging core to be placed opposite to the primary charging core to generate a secondary current in response to the primary current by inductive coupling effect;

a bridge rectifier connected to the secondary charging core to rectify the secondary current and to generate a DC voltage; and

a charge circuit connected to the bridge rectifier to receive the DC voltage for charging.

2. The wireless charging system as claimed in claim 1, wherein the primary charging core comprises a primary coil and a resistor connected in series to the primary coil.

3. The wireless charging system as claimed in claim 2, wherein the controller is configured to measure the primary current from the resistor.

4. The wireless charging system as claimed in claim 2, wherein the primary

charging core further comprises a primary capacitor connected in parallel to the primary coil.

5. A wireless charging system, comprising:

a charging apparatus, comprising;

a power supply to supply a power voltage;

a switch module connected to the power supply to change the power voltage to an input voltage;

a primary charging core connected to the switch module and having a primary current according to the input voltage provided from the switch module;

a compensation coil disposed on a side of the primary charging core; and

a controller connected to the switch module, the primary charging core and the compensation coil, the controller is configured to measure the primary current and to output a control signal for controlling a compensation current of the compensation coil; and

a receiving device to be placed opposite to the charging apparatus to perform wireless charging, the secondary receiving device comprising;

a secondary charging core to be placed opposite to the primary charging core to generate a secondary current in response to the primary current by inductive coupling effect;

a bridge rectifier connected to the secondary charging core to rectify the secondary current and to generate a DC voltage; and

a charge circuit connected to the bridge rectifier to receive the DC voltage for charging.

6. The wireless charging system as claimed in claim 5, wherein the primary charging core comprises a primary coil and a resistor connected in series to the primary coil.

7. The wireless charging system as claimed in claim 6, wherein the controller is configured to measure the primary current from the resistor.

8. The wireless charging system as claimed in claim 5claim 6, wherein the primary

charging core further comprises a primary capacitor connected in parallel to the primary coil.

9. A wireless charging apparatus for wirelessly charging a receiving device, comprising:

a power supply to supply a power voltage;

a switch module connected to the power supply to change the power voltage to an input voltage;

a primary charging core connected to the switch module and having a primary current according to the input voltage provided from the switch module; and

a controller connected to the switch module and the primary charging core, the controller is configured to measure the primary current and to output a control signal for controlling the power voltage provided from the power supply.

10. The wireless charging apparatus as claimed in claim 9, wherein the primary charging core comprises a primary coil and a resistor connected in series to the primary coil.

11. The wireless charging apparatus as claimed in claim 10, wherein the controller is configured to measure the primary inducing current from the resistor.

12. The wireless charging apparatus as 1 claimed in claim 9 claim 10, wherein the

primary charging core further comprises a primary capacitor connected in parallel to the primary coil.

13. A wireless charging apparatus for wirelessly charging a receiving device,

comprising:

a power supply to supply a power voltage;

a switch module connected to the power supply to change the power voltage to an input voltage;

a primary charging core connected to the switch module and having a primary current according to the input voltage provided from the switch module;

a compensation coil disposed on a side of the primary charging core; and

a controller connected to the switch module, the primary charging core and the compensation coil, the controller is configured to measure the primary current and to output a control signal for controlling a compensation current of the compensation coil.

14. The wireless charging apparatus as claimed in claim 13, wherein the primary charging core comprises a primary coil and a resistor connected in series to the primary coil.

15. The wireless charging system as claimed in claim 14, wherein the controller is configured to measure the primary current from the resistor.

16. The wireless charging system as claimed in claim 14, wherein the primary

charging core further comprises a primary capacitor connected in parallel to the primary coil.

17. A method of controlling a wireless 1 charging apparatus, comprising:

receiving a input voltage, wherein the input voltage is used for inputting to a primary charging core;

receiving a primary current of the primary charging core, wherein the primary current is configured to induce a receiving device by inductive coupling effect;

measuring the harmonic distortions of the primary current; and

outputting a control signal for controlling the provided input voltage to the primary charging core in response to the measured result.

18. A method of controlling a wireless charging apparatus, comprising:

receiving a input voltage, wherein the input voltage is used for inputting to

a primary charging core;

receiving a primary current of the primary charging core, wherein the primary current is configured to induce a receiving device by inductive coupling effect;

measuring the harmonic distortions of the primary current; and

outputting a control signal for controlling a compensation current of the compensation coil in response to the measured result.