Patent ID: 6906934
Filing Date: 2005-06-14
Classification: H02M,Y10S

Abstract:
1. An integrated start-up circuit comprising: a start-up capacitor, for providing a supply voltage for powering a control-circuit of the power supply, wherein said start-up capacitor is coupled to a supply voltage terminal of said control-circuit; a first bleeding resistor, connected from a first AC input of a bridge rectifier to said start-up capacitor; a second bleeding resistor, connected from a second AC input of said bridge rectifier to said start-up capacitor; and an ON/OFF circuit, for controlling PWM operation, wherein said ON/OFF circuit will enable PWM operation whenever said supply voltage of said start-up capacitor exceeds a start-threshold voltage, and wherein said ON/OFF circuit will disable PWM operation after the supply voltage drops below a stop-threshold voltage.