Circuit for controlling application of electricity to a coil of

Details Circuit for controlling application of electricity to a coil of Circuit for controlling application of electricity to a coil of

1998-02-12

1999-06-08

Hecker, Stuart N.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

361154, H02M 112, H01H 900

Patent

active

059108908

ABSTRACT:
A control circuit drives the coil of a contactor in response to a control voltage being applied. The control circuit includes a power supply that produces a regulated output voltage from the control voltage. The onset of the regulated output voltage starts a timer which controls the width of pulses produced by a PWM controller. The pulses control a transistor that applies the control voltage to the coil. Initially the pulses cause a high current to flow through the coil to close the contactor and after an interval of time the timer signals the PWM controller to shorten the pulses which applies lesser current to the coil to keep the contacts closed. A flyback circuit provides a relatively low reverse voltage drop path in parallel with the coil to maintain the electromagnetic field during the periods between the pulses. When the control voltage is removed to open the contactor, the flyback circuit provides a high reverse voltage drop path to promptly dampen the coil current.

REFERENCES:
patent: 4274122 (1981-06-01), Hansen et al.
patent: 4516185 (1985-05-01), Culligan et al.
patent: 4885658 (1989-12-01), Biichl
patent: 5055961 (1991-10-01), Wiblin et al.
patent: 5347419 (1994-09-01), Caron et al.
patent: 5531198 (1996-07-01), Matsuura
patent: 5574617 (1996-11-01), Shimanuki et al.
patent: 5737172 (1998-04-01), Ohtsuka
patent: 5818678 (1998-10-01), Berg et al.

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