Method for controlling a driving circuit of a light-emitting device and related electronic device and light source system

• US 8,008,871 B2
• Filed: 08/13/2008
• Issued: 08/30/2011
• Est. Priority Date: 06/16/2008
• Status: Expired due to Fees

• Current Assignee: AMIC Technology Corporation, Power UP, Inc.
• Original Assignee: AMIC Technology Corporation, Power UP, Inc.
• Inventors: Chen, Chun-Ta, Wang, Chun-Chuan
• Primary Examiner(s): PHILOGENE, HAISSA
• Application Number:
  US12/191,293
• Publication Number:
  US 20090309506A1
• Time in Patent Office: 1,112 Days
• Field of Search: 315/291, 315/307, 315/308, 315/169.1, 315/169.3, 315/312, 345/42, 345/76, 345/77, 345/82, 345/204, 345/690, 345/691
• US Class Current: 315/307
• CPC Class Codes: H05B 45/37 Converter circuits

Abstract

A method for controlling a driving circuit of a light-emitting device is disclosed. The driving circuit is utilized for transforming an input power into a driving power for the light-emitting device according to a plurality of state values. The method includes receiving the input power, outputting a first state value of the plurality of state values to the driving circuit, and outputting a second state value of the plurality of state values to the driving circuit according to variation of the input power.

Claims

1. A method for controlling a driving circuit of a light-emitting device, the driving circuit being utilized for transforming an input power into a driving power for the light-emitting device according to a plurality of state values, the method comprising:

receiving the input power;

outputting a first state value of the plurality of state values to the driving circuit; and

outputting a second state value of the plurality of state values to the driving circuit according to variation of the input power.

2. The method of claim 1, wherein outputting the second state value of the plurality of state values to the driving circuit according to variation of the input power is setting the second state value to be a sum of the first state value and a predetermined difference value, and outputting the second state value to the driving circuit when turn-off time of the input power is less than a predetermined value.

3. The method of claim 2, wherein when the first state value is a maximum of the plurality of state values, the second state value is a minimum of the plurality of state values.

4. The method of claim 1, wherein outputting the second state value of the plurality of state values to the driving circuit according to variation of the input power is setting the second state value to be an initial value, and outputting the second state value to the driving circuit when turn-off time of the input power is more than a predetermined value.

5. The method of claim 1, wherein outputting the second state value of the plurality of state values to the driving circuit according to variation of the input power is setting the second state value to be a sum of the first state value and a difference value corresponding to a number of turn-off times of the input power, and outputting the second state value to the driving circuit, according to the number of turn-off times of the input power.

6. An electronic device for controlling a driving circuit of a light-emitting device, the driving circuit being utilized for transforming an input power into a driving power for the light-emitting device according to a plurality of state values, the electronic device comprising:

a reception end for receiving the input power;

a state machine coupled between the reception end and the driving circuit, for outputting a first state value of the plurality of state values to the driving circuit and outputting a second state value of the plurality of state values to the driving circuit according to variation of the input power.

7. The electronic device of claim 6, wherein the state machine sets the second state value to be a sum of the first state value and a predetermined difference value, and outputs the second state value to the driving circuit when turn-off time of the input power is less than a predetermined value.

8. The electronic device of claim 7, wherein when the first state value is a maximum of the plurality of state values, the second state value is a minimum of the plurality of state values.

9. The electronic device of claim 6, wherein the state machine sets the second state value to be an initial value, and outputs the second state value to the driving circuit when turn-off time of the input power is more than a predetermined value.

10. The electronic device of claim 6, wherein the state machine sets the second state value to be a sum of the first state value and a difference value corresponding to a number of turn-off times of the input power, and outputs the second state value to the driving circuit according to the number of turn-off times of the input power.

11. The electronic device of claim 6 further comprising a filter unit coupled between the reception end and the state machine, for filtering the input power.

12. The electronic device of claim 6 further comprising a Schmitt Trigger unit coupled between the reception end and the state machine.

13. A light source system comprising:

a power reception end coupled to a first power;

a switch device coupled to the power reception end, for switching output status of the first power to generate a second power;

a light-emitting device for generating a light source according to a driving power;

a driving circuit coupled between the switch device and the light-emitting device, for transforming the second power into the driving power for the light-emitting device according to a plurality of state values; and

a control device comprising;

a reception end coupled to the switch device, for receiving the second power; and

a state machine coupled between the reception end and the driving circuit, for outputting a first state value of the plurality of state values to the driving circuit and outputting a second state value of the plurality of state values to the driving circuit according to variation of the second power.

14. The light source system of claim 13, wherein the state machine sets the second state value to be a sum of the first state value and a predetermined difference value, and outputs the second state value to the driving circuit when turn-off time of the input power is less than a predetermined value.

15. The light source system of claim 14, wherein when the first state value is a maximum of the plurality of state values, the second state value is a minimum of the plurality of state values.

16. The light source system of claim 13, wherein the state machine sets the second state value to be an initial value, and outputs the second state value to the driving circuit when turn-off time of the input power is more than a predetermined value.

17. The light source system of claim 13, wherein the state machine sets the second state value to be a sum of the first state value and a difference value corresponding to a number of turn-off times of the second power, and outputs the second state value to the driving circuit according to the number of turn-off times of the second power.

18. The light source system of claim 13, wherein the control device further comprises a filter unit coupled between the reception end and the state machine, for filtering the second power.

19. The light source system of claim 13, wherein the control device further comprises a Schmitt Trigger unit coupled between the reception end and the state machine.