Leistungsversorgung mit verbesserter Leistungsfaktorkorrektur.

摘要

A regulated voltage converter circuit includes a storage inductor and a controlled semiconductor switch connected in series circuit to a pair of input terminals that supply a full wave rectified voltage of a sinusoidal 50 Hz AC input voltage. A power factor amplifier receives a divided part of the rectified voltage and produces an output control voltage VM of a predetermined waveform (Fig. 2c). A comparison circuit compares the control voltage VM with a ramp voltage that is proportional to the current flowing through the semiconductor switch. The comparison circuit supplies PWM pulses to a control electrode of the semiconductor switch so as to regulate the output voltage of the converter circuit. The control voltage (VM) waveform is chosen so as to produce near unity power factor correction at the input of the converter circuit.