SYSTEMS AND METHODS FOR DIMMING CONTROL WITH CAPACITIVE LOADS

• US 20150091470A1
• Filed: 12/05/2014
• Published: 04/02/2015
• Est. Priority Date: 04/22/2011
• Status: Active Grant

• Current Assignee: On-Bright Electronics (Shanghai) Co., Ltd. (Orthosie Investment Holdings Ltd.)
• Original Assignee: On-Bright Electronics (Shanghai) Co., Ltd. (Orthosie Investment Holdings Ltd.)
• Inventors: Zhou, Jun, Li, Miao, Cao, Yaming, Luo, Qiang, Fang, Lieyi, Xiong, Zhougliang
• Granted Patent: US 9,414,455 B2
• Time in Patent Office: Days
• US Class Current: 315/291
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/375 using buck topology

Abstract

System and method for dimming control. The system includes a system controller including a first controller terminal and a second controller terminal, a transistor including a first transistor terminal, a second transistor terminal and a third transistor terminal, and a resistor including a first resistor terminal and a second resistor terminal. The system controller is configured to generate a first signal at the first controller terminal based on an input signal and to generate a second signal at the second controller terminal based on the first signal. The first transistor terminal is coupled to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The transistor is configured to receive the second signal at the first transistor terminal and to change between two conditions in response to the second signal.

Claims

1-31. -31. (canceled)

32. A method for dimming control, the method comprising:

receiving an input signal;

processing information associated with the input signal;

generating a first signal based on at least information associated with the input signal;

processing information associated with the first signal;

generating a second signal based on at least information associated with the first signal;

receiving the second signal at a transistor; and

changing the transistor between a first condition and a second condition based on at least information associated with the second signal;

wherein;

the first signal is at a first logic level during a first period of time and changes between the first logic level and a second logic level during a second period of time, the second period of time including a third period of time and a fourth period of time;

the second signal keeps at the second logic level during the first period of time and the third period of time; and

the second signal changes from the second logic level to the first logic level after the third period of time and remains at the first logic level during the fourth period of time.

33. The method of claim 32 wherein the process for changing the transistor between a first condition and a second condition includes:

turning on the transistor under the first condition; and

turning off the transistor under the second condition.

34. The method of claim 32 wherein the first logic level is a logic high level, and the second logic level is a logic low level.

35. The method of claim 32 wherein the first period of time is adjacent to the second period of time.

36. The method of claim 35 wherein:

the first period of time is adjacent to the third period of time; and

the third period of time is adjacent to the fourth period of time.

37. The method of claim 36 wherein:

the second period of time and the third period of time share a same starting time; and

the second period of time and the fourth period of time share a same ending time.

38. The method of claim 32 wherein:

at an ending time of the second period of time, the first signal becomes constant in magnitude at the first logic level; and

at a delayed time, the second signal becomes constant in magnitude at the second logic level, the delayed time being after the ending time.

39. A system controller for dimming control, the system controller comprising:

a first controller terminal;

a second controller terminal; and

a third controller terminal;

wherein the system controller is configured to;

receive an input signal at the first controller terminal;

generate a first signal at the second controller terminal based on at least information associated with the input signal;

process information associated with the first signal;

generate a second signal based on at least information associated with the first signal; and

output the second signal at the third controller terminal;

wherein;

the first signal is at a first logic level during a first period of time and changes between the first logic level and a second logic level during a second period of time, the second period of time including a third period of time and a fourth period of time;

the second signal keeps at the second logic level during the first period of time and the third period of time; and

the second signal changes from the second logic level to the first logic level after the third period of time and remains at the first logic level during the fourth period of time.

40. The system controller of claim 39 wherein the first period of time is adjacent to the second period of time.

41. The system controller of claim 40 wherein:

the first period of time is adjacent to the third period of time; and

the third period of time is adjacent to the fourth period of time.

42. The system controller of claim 41 wherein:

the second period of time and the third period of time share a same starting time; and

the second period of time and the fourth period of time share a same ending time.

43. The system controller of claim 39 wherein:

at an ending time of the second period of time, the first signal becomes constant in magnitude at the first logic level; and

at a delayed time, the second signal becomes constant in magnitude at the second logic level, the delayed time being after the ending time.

44. A method for dimming control, the method comprising:

receiving an input signal;

generating a first signal based on at least information associated with the input signal, the first signal being at a first logic level during a first period of time and changing between the first logic level and a second logic level during a second period of time, the second period of time including a third period of time and a fourth period of time;

processing information associated with the first signal;

generating a second signal based on at least information associated with the first signal; and

outputting the second signal, the second signal keeping at the second logic level during the first period of time and the third period of time, the second signal changing from the second logic level to the first logic level after the third period of time and remaining at the first logic level during the fourth period of time.

45. The method of claim 44 wherein the first period of time is adjacent to the second period of time.

46. The method of claim 45 wherein:

the first period of time is adjacent to the third period of time; and

the third period of time is adjacent to the fourth period of time.

47. The method of claim 46 wherein:

the second period of time and the third period of time share a same starting time; and

the second period of time and the fourth period of time share a same ending time.

48. The method of claim 44 wherein:

at an ending time of the second period of time, the first signal becomes constant in magnitude at the first logic level; and

at a delayed time, the second signal becomes constant in magnitude at the second logic level, the delayed time being after the ending time.