Patent ID: 6219263
Filing Date: 2001-04-17
Classification: H02M,Y02B,Y02P

Abstract:
An electronic supply device for a load comprising:a bridge rectifier having a pair of input terminals that receive a periodic voltage and a pair of output terminals; anda power factor correction circuit connected to the pair of output terminals of the bridge rectifier, the power factor correction circuit including two capacitors, a first rectifier diode coupled to the two capacitors to charge the two capacitors in series, and second and third rectifier diodes coupled to the two capacitors to discharge the two capacitors in parallel, wherein the power factor correction circuit further includes:a resistor that is series-connected with the first rectifier diode to limit the current drawn in the two capacitors and to reduce low frequency harmonic contents of a current conducted by the bridge rectifier;a current-controlled electronic switch that is parallel-connected with the first rectifier diode in series with the resistor; andwherein, to discharge the two capacitors in parallel, the second and third rectifier diodes are zener diodes, to protect the load against overvoltages.