A.C. power controller with short circuit and overload protection

Details A.C. power controller with short circuit and overload protection A.C. power controller with short circuit and overload protection

1989-03-02

1990-09-04

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388903, 361 31, 361 93, H02P 500

Patent

active

049550691

ABSTRACT:
An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a solid state switch, such as a MOSFET or a bipolar transistor, that is gate controlled by gate signals synchronized to the A.C. source. The gate signals are provided from an optocoupler to control the solid state switch and the load current. Overload, short circuit, and low A.C. line voltage conditions are sensed by protection circuits which signal the optocoupler to turn off the solid state switch and, thus, the load current. A fast turn off time, in the range of a few microseconds, is achieved which, together with the rectifier and solid state switch configuration, provides a power controller which is resistant to short circuit and overload destruction present in conventional A.C. solid state circuit breakers and power control devices.

REFERENCES:
patent: 3879652 (1973-08-01), Billings
patent: 4110809 (1978-08-01), Cronin
patent: 4143410 (1979-03-01), Cronin
patent: 4245184 (1981-01-01), Billings et al.
patent: 4359681 (1982-11-01), Baker et al.
patent: 4500802 (1985-02-01), Janutka
patent: 4626954 (1986-12-01), Damiano et al.
patent: 4633161 (1986-12-01), Callahan et al.
patent: 4656365 (1987-04-01), Billings
patent: 4740883 (1988-04-01), McCollum

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