Systems and methods for dimming control with capacitive loads

A system for dimming control, the system comprising:

• a system controller including a first controller terminal, a second controller terminal, and a third controller terminal;
• a first transistor including a first transistor terminal, a second transistor terminal and a third transistor terminal;
• and
• a first resistor including a first resistor terminal and a second resistor terminal;
• wherein:
• the system controller is configured to generate a first signal at the first controller terminal based on at least information associated with an input signal and to generate a second signal at the second controller terminal based on at least information associated with the first signal;
• the first transistor terminal is coupled, directly or indirectly, to the second controller terminal;
• the second transistor terminal is coupled, directly or indirectly, to the third controller terminal, the third controller terminal being biased at a first voltage;
• the first resistor terminal is coupled to the second transistor terminal;
• the second resistor terminal is coupled to the third transistor terminal;
• and
• the first transistor is configured to receive the second signal at the first transistor terminal and to change between a first condition and a second condition in response to the second signal.

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.

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.

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.