Method and circuit for controlling a hybrid contactor

Details Method and circuit for controlling a hybrid contactor Method and circuit for controlling a hybrid contactor

1981-01-05

1982-10-26

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 3, 361 13, H02H 300

Patent

active

043565255

ABSTRACT:
A method and circuit for minimizing DC current offset generated by the voltage-integrating property of an inductive load. First, second and third hybrid contactors connect first, second, and third output lines of an AC power source to first, second, and third input lines of an inductive load. Each hybrid contactor includes a pair of relay contacts in parallel with a semiconductor switching unit having two antiparallel-connected silicon-controlled-rectifiers. A latching circuit and several delay circuits are used to turn on and off the hybrid contactors; the timing of the turn-on points is controlled relative to a zero-crossing of a voltage from the AC power source such that minimal DC offset current occurs.

REFERENCES:
patent: 3446991 (1969-05-01), Howell
patent: 3466503 (1969-09-01), Goldberg
patent: 3504233 (1970-03-01), Hurtle
patent: 3633069 (1972-01-01), Bernard
patent: 3736466 (1973-05-01), Fox et al.
patent: 3783305 (1974-01-01), Lefferts
patent: 4068273 (1978-01-01), Metzler
patent: 4074333 (1978-02-01), Murakami et al.
patent: 4152634 (1979-05-01), Penrod
patent: 4296449 (1981-10-01), Eichelberger

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