Vital inverter driver

Details Vital inverter driver Vital inverter driver

1986-04-07

1987-03-24

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 97, 363131, 361 87, H02H 7122

Patent

active

046529861

ABSTRACT:
A vital inverter driver includes an oscillator which, upon energization, outputs a signal of predetermined frequency to two identical parallel-arranged counter circuits, which step down the oscillator output to the desired frequency. One counter output is fed to an inverting amplifier, while the other is coupled to a noninverting amplifier, thereby resulting in output count signals of identical frequency and amplitude but being 180.degree. out of phase. A summing circuit, having two series-resistance arrangements with different resistance values for weighting purposes, and a summing transformer passes a signal of a predetermined magnitude through an overload protection device which could be a fuse or a breaker, when the output count signals are 180.degree. out of phase. When the count signals are other than 180.degree. out of phase, a failure in circuitry or operation has likely occurred, and the signal output from the summing circuit exceeds the predetermined magnitude and activates the overload protection device.

REFERENCES:
patent: 3930194 (1975-12-01), Walker
patent: 4150424 (1979-04-01), Nuechterlein
patent: 4477867 (1984-10-01), Pellegrino
patent: 4574342 (1986-03-01), Runyan

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