Raymond L Larson

US Patent:

39393968, Feb 17, 1976

Filed:

Feb 6, 1974

Appl. No.:

5/439867

Inventors:

Raymond E. Larson - Fort Worth TX

Assignee:

ECC Corporation - Euless TX

International Classification:

G05F 144

US Classification:

323 8

Abstract:

A semiconductor switching device is connected in shunt with an A. C. voltage source to be regulated. A modified full-wave bridge rectifier is connected across the voltage source by a first pair of diagonally opposite nodes. A control circuit including a capacitor is connected across the output between a second pair of diagonally opposite nodes of the bridge rectifier to control a gate electrode of the switching device to control the triggering of the switching device in response to the voltage across the bridge rectifier output. The triggering of the switching device regulates the voltage supplied by the voltage source. The bridge rectifier includes an impedance network comprising first and second resistors branching from one of the nodes of the second diagonal pair, each resistor being connected via a diode to a different node of the first diagonal pair. The impedance network also includes a third resistor coupled between the junction of the first resistor and corresponding diode and the junction of the second resistor and corresponding diode.