TRANSISTORIZED AC VOLTAGE REGULATOR INCORPORATING DAMPING CAPACITOR Russian patent published in 2003 - IPC

FIELD: three-phase pulse-width output voltage regulators. SUBSTANCE: output voltage is regulated by means of transistor switch installed at output of first diode bridge connected to like-polarity leads of matching transformer secondary windings; other diode bridge is connected to other like-polarity leads of these transformer windings, polar capacitors being connected across output terminals of both bridges. Stepless switching of current is ensured due to voltage across plates of rather high-value damping capacitor connected to output terminals of first bridge. To this end mentioned capacitor is changed over to mode of charge- discharge alternating at every switching interval with aid of two additional transistor switches of which one connects common cathodes of second-bridge diodes to common anodes of first-bridge diodes, and second transistor switch connects positive plate of damping capacitor to common anodes of second-bridge diodes. EFFECT: provision for stepless current commutation without heavy switching surges. 1 cl, 3 dwg