Low cost automatic voltage doubler switch

Details Low cost automatic voltage doubler switch Low cost automatic voltage doubler switch

1988-08-30

1989-02-14

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to connect the input to diverse power sources

363 50, 363126, 323300, H02M 710

Patent

active

048050830

ABSTRACT:
An automatic voltage doubler switch includes a triac for converting a rectifier arrangement from a direct to a doubler mode of operation. Drive current for the triac is supplied by a resistor and capacitor circuit connected across one of the rectifiers in the bridge network. A self-biasing SCR trigger circuit senses the AC line voltage and has its anode and cathode coupled across the capacitor. When the AC line rises to a predetermined level, the SCR fires and shorts out the capacitor to render the triac nonconductive. The capacitor delays drive current on start up until the SCR trigger can sense the AC line voltage. The capacitor also maintains the triac conductive during opposite polarities of the AC line. The capacitor also maintains the SCR in conduction during phase reversals of the AC line. A switchable RC delay is activated only during the voltage doubler mode to delay operation of the SCR trigger.

REFERENCES:
patent: 4608500 (1986-08-01), Togawa
patent: 4654538 (1987-03-01), Lethellier
patent: 4658345 (1987-04-01), Ingman
patent: 4665323 (1987-05-01), Russell et al.

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