H - Electricity – 01 – H
Patent
H - Electricity
01
H
348/1
H01H 9/56 (2006.01) H01H 57/00 (2006.01)
Patent
CA 1250940
Zero Crossing Synchronous AC Switching Circuits Employing Piezoceramic Bender- Type Switching Devices ABSTRACT OF THE DISCLOSURE Zero crossing synchronous AC switching circuits are provided which employ piezoelectric ceramic bender-type switching devices for use in supplying loads of a resistive, inductive or capacitive nature. The circuits include zero crossing sensing sub-circuits for sensing the passage through zero value of a supply source of alternating current voltage and/or current and for deriving zero crossing timing singals representative of the occurrance of the zero crossings. The zero crossing timing signals are employed to control operation of a bender energizing potential control sub-circuit for selectively controlling application or removal of a bender energizing potential across the piezoelectric bender member of the bender-type switching devices. Phase shift networks are included in the circuit for shifting the phase or time of application of the selectively applied bender energization potential so as to cause it to close or open a set of load current carrying switch contacts substantially at or near the naturally occurring zero crossings of the applied alternating current supplying the load.
497091
Farrall George A.
Harnden John D. Jr.
Kornrumpf William P.
Company General Electric
Eckersley Raymond A.
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