Circuit breaker including interface to convert a rectified signa

Details Circuit breaker including interface to convert a rectified signa Circuit breaker including interface to convert a rectified signa

1998-05-27

1999-12-28

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361102, H02H 300

Patent

active

060089733

ABSTRACT:
A circuit breaker and method for interrupting the flow of electric current in a line includes connecting separable contacts to a conductor in the circuit. An actuating device, actuated by an activating signal, is connected to the separable contacts to effect separation of the contacts wherein the flow of electric current in the circuit is interrupted. A current sensor, such as an iron core current transformer, senses the current in the circuit to provide a first sinusoidal signal. A bridge rectifier is connected to the current sensor wherein the first sinusoidal signal is converted to a rectified signal and power is derived from the rectified signal. An interface circuit connected to the rectifying network converts the rectified signal into a second sinusoidal signal for providing the activating signal to the actuating device at a predetermined magnitude of the first sinusoidal signal. The interface circuit includes generating a sign bit indicative of the polarity of the first sinusoidal signal. A switch, such as a complimentary metal-oxide silicon (CMOS) switch, generates a positive half-wave rectified signal and a negative half-wave rectified signal from the rectified signal and the sign bit. The negative half-wave rectified signal is inverted and the positive half-wave rectified signal and the inverted negative half-wave rectified signal are summed and level shifted relative to the magnitude of the first sinusoidal signal to generate a second sinusoidal signal in phase with the first sinusoidal signal.

REFERENCES:
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patent: 4080640 (1978-03-01), Elms et al.
patent: 4736265 (1988-04-01), Gyongyosi et al.
patent: 4839770 (1989-06-01), Ruta
patent: 5038246 (1991-08-01), Durivage, III
patent: 5276416 (1994-01-01), Ozaki

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