Wireless Charging System and Related Method for Transmitting Data

• US 20130127407A1
• Filed: 01/11/2012
• Published: 05/23/2013
• Est. Priority Date: 11/17/2011
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Wistron Corporation
• Inventors: Kao, Yi-Sheng
• Granted Patent: US 8,947,044 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• 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
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/025 using non-contact coupling, e.g. inductive, capacitive
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The invention discloses a wireless charging system for transmitting data. The wireless charging system includes a charging device for wirelessly transmitting a source signal and adjusting a current corresponding to the source signal according to a transmitted datum, and a receiving device which includes a first coil for receiving the source signal according to the electromagnetic effect and generating a corresponding AC current signal, and an output module for obtaining the transmitted datum according to the AC current signal.

Claims

1. A wireless charging system for transmitting data comprises:

a charging device for wirelessly transmitting a source signal and adjusting a current value corresponding to the source signal according to a transmitted datum; and

a receiving device comprising;

a first coil for receiving the source signal according to electromagnetism and accordingly generating an AC current signal; and

an output module for retrieving the transmitted datum according to the AC current signal.

2. The wireless charging system of claim 1, wherein the output module comprises:

a rectifying module, electrically connected to the first coil for rectifying the AC current signal to generate a DC current signal; and

a transforming module, for transforming the DC current signal into a digital signal to retrieve the transmitted datum.

3. The wireless charging system of claim 2, wherein the output module further comprises:

a stabilizing module, for stabilizing the DC current signal.

4. The wireless charging system of claim 3, wherein the stabilizing module comprises:

an up-loop switch, comprising an input end coupled to a power supply, an output end and a control end;

a down-loop switch, comprising an input end coupled to the output end of the up-loop switch, an output end coupled to the ground and a control end;

an oscillating module, comprising a capacitor and a inductor; and

a stabilizing logic controller, for outputting a control signal to the control end of the up-loop switch and the control end of the down-loop switch according to terminal voltage of both ends of the inductor, so as to switch on or off the up-loop switch and the down-loop switch.

5. The wireless charging system of claim 3, wherein the transforming module comprises:

an operating amplifier, electrically connected to the rectifying module and the stabilizing module for receiving the DC current signal, to generate a amplifying current; and

a division module, electrically connected to the operating amplifier for transforming changes of the amplifying current into a plurality of bit information, to retrieve the transmitted datum.

6. The wireless charging system of claim 1, wherein the charging module comprises:

a first current source, for supplying a current signal;

a controller, for adjusting the current value of the current signal according to the transmitted datum; and

a second coil, for transforming the current signal into the source signal, and transmitting the source signal to the receiving module via electromagnetism.

7. A data transmitting method for a wireless charging system, wherein the wireless charging system comprises a charging module and a receiving module, the data transmitting method comprising:

the charging module coupled to the receiving module via an interacting magnetic field, so as to transmit a source signal to the receiving module in a radio frequency way;

the charging module adjusting a current value corresponding to the current signal according to a transmitted datum, so as to transmit the transmitted datum to the receiving module via the source signal; and

the receiving module receiving the source signal via electromagnetism, so as to retrieve the transmitted datum within the source signal.

8. The data transmitting method of claim 7, wherein the charging module stabilizes the current value corresponding to the source signal around a fix value, so as to adjusting the current value within a predetermined range according to the transmitted datum.

9. The data transmitting method of claim 7, wherein the receiving module detects changes in the current value corresponding to the source signal, to retrieve the transmitted datum within the source signal.

10. The data transmitting method of claim 7, further comprising the charging module transmitting a transmitting data command before adjusting the current value corresponding to the source signal according to the transmitted data, so as to initiate the receiving module to receive the transmitted data.

11. The data transmitting method of claim 7, further comprising the charging module adjusting the current value corresponding to the source signal according to a testing information before adjusting the current value corresponding to the source signal according to the transmitted data, so as to detect a transmitting environmental condition.

12. The data transmitting method of claim 7, wherein the step of the charging module adjusting the current value corresponding to the source signal according to the transmitted datum further comprises:

the charging module adjusting the current value corresponding to the source signal according to the transmitted datum and the transmitting environmental condition.