Method and apparatus for controlling the equivalent resistance of a converter

A method for controlling an equivalent resistance of a converter, wherein the method is adapted to an apparatus for controlling the equivalent resistance of the converter, and the apparatus includes a voltage conversion module, the method comprising:

• receiving a power source input signal;
• generating a first control signal according to a voltage level and a state of the power source input signal to adjust an equivalent resistance of the voltage conversion module and cause the voltage conversion module to operate in a damper mode or a converter mode;
• converting the power source input signal to an output signal when the voltage conversion module operates in the converter mode;
• adjusting the equivalent resistance of the voltage conversion module to provide a required damper resistance when the voltage conversion module operates in the damper mode;
• detecting the voltage level or a current level of the power source input signal to generate a second control signal, and adjusting the equivalent resistance to provide a required holding current for a dimmer and cause the voltage conversion module to operate in a bleeder mode or the converter mode to convert the power source input signal to the output signal, after the voltage conversion module finishes operating in the damper mode;
• and
• adjusting the equivalent resistance of the voltage conversion module so that the current level is greater the required holding current of the dimmer when the voltage conversion module operates in the bleeder mode.