Wireless LED driver

• US 9,717,133 B2
• Filed: 11/02/2016
• Issued: 07/25/2017
• Est. Priority Date: 11/06/2015
• Status: Active Grant

• Current Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd. (Silergy Corporation)
• Original Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd. (Silergy Corporation)
• Inventors: Zhang, Wang, Chen, Wei, Zhao, Chen
• Primary Examiner(s): Philogene, Haissa
• Application Number:
  US15/341,235
• Publication Number:
  US 20170135187A1
• Time in Patent Office: 265 Days
• Field of Search: 315291, 315247, 315278, 315209 R, 315224, 315307, 315360
• CPC Class Codes: H05B 45/39 Circuits containing inverter bridges
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 47/19 via wireless transmission
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A wireless LED driver can include: an electrical energy transmitter comprising an inverter circuit coupled to receive an input power supply, and being configured to convert a received voltage signal to an AC signal; the electrical energy transmitter comprising N transmitter coupling circuits coupled to the inverter circuit, and being configured to be driven by the AC signal; an electrical energy receiver comprising M receiver coupling circuits coupled to the transmitter coupling circuits in a contactless mode, and being configured to receive the AC signal; and the electrical energy receiver comprising M rectifier circuits coupled to the receiver coupling circuits one by one, where each the rectifier circuit is configured to convert the AC signal to a DC signal to drive an LED load coupled to output terminals of the rectifier circuit, and where N and M are integers not less than 1.

Claims

1. A wireless light-emitting diode (LED) driver, comprising:

a) an electrical energy transmitter comprising an inverter circuit coupled to receive an input power supply, and being configured to convert a received voltage signal to an AC signal;

b) said electrical energy transmitter comprising N transmitter coupling circuits coupled to said inverter circuit, and being configured to be driven by said AC signal;

c) an electrical energy receiver comprising M receiver coupling circuits coupled to said transmitter coupling circuits in a contactless mode, and being configured to receive said AC signal; and

d) said electrical energy receiver comprising M rectifier circuits coupled to said receiver coupling circuits one by one, wherein each said rectifier circuit is configured to convert said AC signal to a DC signal to drive an LED load coupled to output terminals of said rectifier circuit, and wherein N and M are integers not less than 1.

2. The wireless LED driver of claim 1, wherein said electrical energy receiver further comprises M power converters, each said power converter being coupled between said output terminals of said rectifier circuits and said LED load, and being configured to generate a constant driving current to drive said LED load.

3. The wireless LED driver of claim 2, wherein said power converter is configured as a linear regulator.

4. The wireless LED driver of claim 2, wherein said power converter is configured as a switching power regulator.

5. The wireless LED driver of claim 1, wherein said inverter circuit is configured as a half bridge inverter circuit.

6. The wireless LED driver of claim 1, wherein said inverter circuit is configured as a full bridge inverter circuit.

7. The wireless LED driver of claim 1, wherein said inverter circuit is configured as a compound half bridge inverter circuit having at least three half bridge circuits.

8. The wireless LED driver of claim 1, wherein said electrical energy transmitter further comprises a power converter coupled between said input power supply and said inverter circuit, and being configured to convert said input voltage.

9. The wireless LED driver of claim 1, wherein said electrical energy transmitter further comprises impedance conversion networks coupled between said inverter circuit and said transmitter coupling circuits to achieve impedance matching and impedance conversion performance.

10. The wireless LED driver of claim 1, wherein said wireless LED driver further comprises a communication circuit configured to transfer a feedback signal representing driving current flowing through said LED load in a contactless communication mode.

11. The wireless LED driver of claim 10, wherein said wireless LED driver further comprises a control circuit configured to control the operation of a power converter and/or said inverter circuit in accordance with said feedback signal and a reference signal to maintain said driving current to be consistent with a predetermined value.

12. The wireless LED driver of claim 1, wherein said wireless LED driver further comprises communication circuits, each said communication circuit being configured to transfer a feedback signal that represents a driving voltage of one of said LED loads in a contactless communication mode.

13. The wireless LED driver of claim 12, wherein said wireless LED driver further comprises a control circuit configured to control the operation of a power converter and/or said inverter circuit in accordance with a minimum value of said feedback signals to control the value of said driving voltages to achieve higher efficiency.

14. The wireless LED driver of claim 2, wherein:

a) said M power converters are controlled by enable signals to regulate the average current flowing through said LED loads;

b) said M power converters are in operation when said enable signals are active; and

c) said M power converters are out of operation when said enable signals are inactive.

15. The wireless LED driver of claim 1, wherein said transmitter coupling circuit is configured to one or more said receiver coupling circuits.

16. The wireless LED driver of claim 7, wherein output terminals of two of said half bridge circuits are coupled to drive corresponding one of said transmitter coupling circuits.

17. The wireless LED driver of claim 16, wherein said transmitter coupling circuits are controlled to be operated in turn by controlling the operation of said compound half bridge inverter circuit.