WIRELESS CHARGING DEVICE

• US 20140266032A1
• Filed: 03/05/2014
• Published: 09/18/2014
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: TSAI, Ming-Ting, TU, Wei-Chen, WU, Yii-Lin, HUNG, Hsiang-Jue
• Granted Patent: US 9,325,198 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A wireless charging device includes a plurality of power supply modules, a control unit and a charge module. Each of the power supply modules includes a receiver and a conduction circuit. The receiver outputs an induction current. The conduction circuit is coupled to the receiver and generates an output signal according to the induction current. The control unit is coupled to the power supply modules and generates a control signal according to the induction current outputted by the receivers. The charge module is coupled to the power supply modules and generates a charge current according to the output signal generated from the power supply modules. The control unit adjusts the maximum value of the charge current according to the number of the power supply modules which generate the induction current.

Claims

1. A wireless charging device, comprising:

a plurality of power supply modules, wherein each of the power supply modules includes;

a receiver outputting an induction current; and

a conduction circuit coupled to the receiver and generating an output signal according to the induction current;

a control unit coupled to the power supply modules and generating a control signal according to the induction current outputted by the receiver; and

a charge module coupled to the power supply modules and receiving the output signal generated from the power supply modules to output a charge current,

wherein the control unit adjusts a maximum value of the charge current of the charge module according to the number of the power supply modules which generate the induction current.

2. The wireless charging device according to claim 1, wherein the conduction circuit includes:

a switch element, wherein one end of the switch element is coupled to the charge module; and

a current limiting controller coupled to the receiver and the other end of the switch element.

3. The wireless charging device according to claim 2, wherein the current limiting controller includes:

a current detecting module detecting the induction current, and

a resistance adjusting module coupling to the current detecting module and receiving the induction current;

wherein when the induction current is larger than a predetermined value, the current detecting module outputs a detecting signal to the resistance adjusting module to adjust a resistance.

4. The wireless charging device according to claim 3, wherein the current detecting module further includes:

a detecting resistor, wherein the induction current flows through the detecting resistor;

a first comparator including two inputting ends, wherein the two inputting ends are coupled to two ends of the detecting resistor, respectively, and the first comparator outputs a compare signal according to a voltage difference between the two ends of the detecting resistor;

a reference voltage; and

a second comparator receiving the compare signal and the reference voltage and accordingly outputting the detecting signal to the resistance adjusting module.

5. The wireless charging device according to claim 3, wherein the resistance adjusting module is a transistor.

6. The wireless charging device according to claim 1, wherein each of the conduction circuits includes a switch element, and the switch element and the receiver are connected in parallel.

7. The wireless charging device according to claim 1, wherein each of the receivers includes:

a first induction coil; and

a receiving circuit coupled to the first induction coil and the conduction circuit.

8. The wireless charging device according to claim 7, wherein the wireless charging device further includes:

a plurality of transmitters electrically connected to a power source, respectively, and generating a working current; and

a plurality of second induction coils coupled to the transmitters, respectively, and receiving the working current, wherein the receiver outputs the induction current according to the working current.

9. The wireless charging device according to claim 1, wherein the wireless charging device further includes:

a detecting module coupled to the power supply modules; and

a switch coupled to the charge module and the control unit,

wherein when the detecting module receives an external power source, the detecting module outputs multiple turn off signals, the power supply modules stop outputting the induction current according to the turn off signals, and the control unit outputs a switch signal to conduct the switch.