Automatic voltage doubler switch

Details Automatic voltage doubler switch Automatic voltage doubler switch

1987-09-25

1988-11-08

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to connect the input to diverse power sources

363 60, 323300, H02M 704

Patent

active

047837292

ABSTRACT:
An automatic voltage doubler switch includes a Triac having a gate electrode that is driven by a relaxation oscillator that includes a Diac switch. A capacitor, charged from a voltage that is indicative of the AC line voltage, triggers the Triac through the Diac switch to complete a conductive path for converting the power supply from a direct operating mode to a voltage doubler operating mode. A cutoff transistor senses the AC line voltage and functions to disable the relaxation oscillator when the AC line is at a particular level. A hysteresis circuit reduces the resistance in the base circuit of a line voltage detector transistor to keep it in conduction despite further drops in line voltage. A hysteresis inhibit transistor operates on power up of the power supply to override the effects of the hysteresis circuit.

REFERENCES:
patent: 3900787 (1975-08-01), Koster
patent: 4590546 (1986-05-01), Maile
patent: 4654538 (1987-03-01), Lethellier
patent: 4658345 (1987-04-01), Ingman
patent: 4665323 (1987-05-01), Russell et al.

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