ACTIVE DAMPING CIRCUIT, ACTIVE DAMPING METHOD, POWER SUPPLY DEVICE COMPRISING THE ACTIVE DAMPING CIRCUIT

摘要

An active damping circuit according to an exemplary embodiment of the present invention is applied to a power supply using an input voltage that is generated by rectifying an AC input passed through a dimmer. The active damping circuit includes: an active damper including a damper resistor coupled to the input voltage and a damper switch coupled in parallel with the damper resistor; and an active damping controller controlling a switching operation of the damper switch using a high voltage switch that generates a predetermined power voltage to control a resistance value of the active damper of a firing period of the input voltage to be higher than a resistance value of the active damper of other periods, excluding at least the firing period among a period during which the input voltage is generated.