AC-TO-DC VOLTAGE CHANGER Russian patent published in 1998 - IPC

FIELD: electric measurement technology in power engineering for automatic voltage control by means of, for example, static thyristor reactive-power compensators. SUBSTANCE: voltage changer has input transformer 1, channels 4, 5, adder 8. Each channel incorporates integrator 10, storage unit 12, switches 11, 13, control unit 14. Newly introduced is square-wave voltage generator 17 whose synch input is connected to secondary circuit of transformer 1 and its counterphase outputs, to control input of channels 4, 5. EFFECT: improved reliability of voltage changer operation at low values of voltage being measured and even in case of its failure. 2 cl, 2 dwg