Dimmer compatible LED driving apparatus with bleeding circuit

摘要

An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a tank element, a first transistor, a second transistor, a free-wheeling switch, an output capacitor, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, and a bleeding control circuit generating a control signal to control the bleeding circuit based on the voltage sensing signal.