H - Electricity – 02 – H
Patent
H - Electricity
02
H
321/55, 321/61
H02H 7/122 (2006.01) B61L 1/18 (2006.01) H02M 7/48 (2006.01)
Patent
CA 1272756
ABSTRACT OF THE DISCLOSURE A vital inserter driver includes can 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° 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° out of phase. When the count signals are other than 180° 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.
523080
Fetherstonhaugh & Co.
Union Switch & Signal Inc.
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