Systems and methods for intelligent dimming control using TRIAC dimmers

An apparatus for a power conversion system, the apparatus comprising:

• a process-and-drive component configured to receive an input signal, process information associated with the input signal, and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system;
• wherein:
• the input signal includes one or more input pulses and a first input pulse, the one or more input pulses corresponding to one or more input periods respectively, the first input pulse corresponding to a first input period, the first input period being after the one or more input periods;
• the drive signal is associated with one or more modulation periods and a first modulation period, the one or more modulation periods corresponding to the one or more input periods respectively, the first modulation period corresponding to the first input period;
• wherein:
• the one or more input pulses are associated with one or more pulse widths respectively;
• the process-and-drive component is further configured to:
• process information associated with the one or more pulse widths;
• select a first smallest pulse width from the one or more pulse widths;
• determine a first duration of the first modulation period based on at least information associated with the first smallest pulse width;
• and
• change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period.

A method for a power conversion system, the method comprising:

• receiving an input signal including a first pulse associated with a first input period and a second pulse associated with a second input period;
• processing information associated with the input signal;
• and
• outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system, the drive signal being associated with a first modulation period for the first input period and a second modulation period for the second input period;
• wherein the processing information associated with the input signal includes:
• determining the first modulation period for the first input period;
• and
• determining the second modulation period for the second input period;
• wherein the outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system includes:
• changing the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period;
• and
• changing the drive signal between the first logic level and the second logic level at the modulation frequency during the second modulation period;
• wherein:
• the first pulse corresponds to a first pulse width;
• the second pulse corresponds to a second pulse width;
• the first modulation period corresponds to a first duration;
• and
• the second modulation period corresponds to a second duration;
• wherein:
• the first pulse width and the second pulse width are different in magnitude;
• and
• the first duration and the second duration are equal in magnitude.

A method for a power conversion system, the method comprising:

• receiving an input signal, the input signal including one or more input pulses and a first input pulse, the one or more input pulses corresponding to one or more input periods respectively, the first input pulse corresponding to a first input period, the first input period being after the one or more input periods;
• processing information associated with the input signal;
• and
• outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system, the drive signal being associated with one or more modulation periods and a first modulation period;
• wherein:
• the one or more modulation periods correspond to the one or more input periods respectively;
• the first modulation period corresponds to the first input period;
• the one or more input pulses are associated with one or more pulse widths respectively;
• wherein the processing information associated with the input signal includes:
• processing information associated with the one or more pulse widths;
• selecting a first smallest pulse width from the one or more pulse widths;
• and
• determining a first duration of the first modulation period based on at least information associated with the first smallest pulse width;
• and
• wherein the outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system includes changing the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period.