METHOD FOR TRANSMITTING DATA AND WIRELESS CHARGER FOR IMPLEMENTING SAME

• US 20150145473A1
• Filed: 11/19/2014
• Published: 05/28/2015
• Est. Priority Date: 11/22/2013
• Status: Active Grant

• Current Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd. (Silergy Corporation)
• Original Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd. (Silergy Corporation)
• Inventors: SHEN, Xuzhen, ZHANG, Lingdong
• Granted Patent: US 9,843,210 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A method for transmitting data and a wireless charging equipment using the same are disclosed. When the wireless charger transmits data, an output current of the wireless charger is controlled at a preset current value so that there is a higher variation in amplitude of a current or a voltage on an inductive element to thereby enable a signal receiver to demodulate the signal. At the end of data transmission, the output current is resumed consistent with a driving current of the load at the moment. The present disclosure can address the problem of impossible normal communication in the wireless charger at the circumstance of a very low driving current of the load without any increase in cost and complexity of the circuit.

Claims

1. A method for transmitting data in a wireless charger configured to power a load, said method comprising:

modulating an electric parameter on a first inductive element in accordance with a data signal to be transmitted to obtain a first signal characterizing said data signal;

sensing said first signal to generate a second signal on a second inductive element; and

demodulating said second signal to obtain said data signal transmitted thereto;

wherein during data transmission, an output current of said wireless charger is set at a preset current value;

until the end of data transmission said output current is resumed consistent with a driving current of said load.

2. The method for transmitting data according to claim 1, wherein modulating said electric parameter on said first inductive element in accordance with said data signal to be transmitted comprises:

cutting off power to said load on each rising edge of said data signal; and

conducting the power to said load on each falling edge of said data signal.

3. The method for transmitting data according to claim 1, wherein said electric parameter is a current, said first signal and said second signal are both current signals.

4. The method for transmitting data according to claim 1, wherein said electric parameter is a voltage, said first signal and said second signal are both voltage signals.

5. The method for transmitting data according to claim 1, wherein said second signal is demodulated by means of demodulating the amplitude of said second signal.

6. The method for transmitting data according to claim 1, wherein said first inductive element and said second inductive element are two windings of a transformer.

7. The method for transmitting data according to claim 6, wherein said first inductive element is a secondary winding of said transformer, and said second inductive element is a primary winding of said transformer.

8. A wireless charger configured to power a load, comprising:

a signal transmitter configured to modulate an electric parameter on a first inductive element in accordance with a data signal to be transmitted to obtain a first signal characterizing said data signal; and

a signal receiver configured to sense said first current signal to generate a second signal on a second inductive element and to demodulate said second signal to obtain said data signal transmitted thereto;

wherein during data transmission between said signal transmitter and said signal receiver, output current of said wireless charger is set at a preset current value;

until the end of data transmission said output current is resumed consistent with a driving current of said load.

9. The wireless charger according to claim 8, wherein said signal transmitter is configured to modulate said electric parameter on said first inductive element by means of cutting off power to said load on each rising edge of said data signal and conducting power to said load on each falling edge of said data signal.

10. The wireless charger according to claim 8, wherein said electric parameter is a current, said first signal and said second signal are both current signals.

11. The wireless charger according to claim 8, wherein said electric parameter is a voltage, said first signal and said second signal are both voltage signals.

12. The wireless charger according to claim 8, wherein said signal receiver is configured to demodulate said second signal by means of demodulating the amplitude of said second signal.

13. The wireless charger according to claim 8, wherein said first inductive element and said second inductive element are two windings of a transformer.

14. The wireless charger according to claim 13, wherein said first inductive element is a secondary winding of said transformer, and said second inductive element is a primary winding of said transformer.