公开(公告)号：US3665293A

公开(公告)日：1972-05-23

申请号：US3665293D

申请日：1971-03-03

Applicant: GEN ELECTRIC

Inventor： KEILER YOEL ,  KELLEY FRED W JR ,  LEZAN GEORGES R E

IPC: G05F1/445 ,  G05F1/455 ,  H02M1/08 ,  G05F1/56

CPC classification number: G05F1/455 ,  G05F1/445 ,  H02M1/081

Abstract: A gating control for an a-c phase-controlled, single-phase static switch comprising a pair of thyristors connected in inverse parallel relationship in a power circuit that has a variable power factor. The gating control controls the length of the non-conducting period between successive conduction periods of the switch in such a manner that the length of the nonconducting period is made approximately inversely proportional to an input control signal for the gating control, when the input control signal is between 0 and 1 per unit. A conduction-angle balancing circuit modifies the action of the gating control in such a manner that the conduction angles are forced toward a condition of equality despite a change therein produced by a change in the effective input control signal and despite the power circuit''s having a low power factor.