DC actuator control circuit with voltage compensation, current c

Details DC actuator control circuit with voltage compensation, current c DC actuator control circuit with voltage compensation, current c

1996-05-06

1999-06-22

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361154, 361160, H01H 4702

Patent

active

059148497

ABSTRACT:
The DC actuator control circuit with voltage compensation, current control and fast dropout period employs an electronic chopper incorporating an oscillator having a variable duty cycle controlled by sensing of coil current. Coil current is sampled through a series resistor by a feedback amplifier which increases or decreases the period in which the switch for the coil circuit remains on to sustain average coil current at the desired MMF. A threshold detector provides an initial triggering signal to initiate operation of the actuator and the control circuit responsive to a predetermined source voltage and a gate signal generator responds to the triggering signal with a time constant sufficient to drive the coil through a pickup interval. Inrush current is limited by the oscillator through sensing of coil current. A dropout switch for opening the sustaining current return circuit which opens upon removal of source voltage provides a high impedance for rapid current drain from the coil thereby eliminating regeneration effects.

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The encyclopedia of electronic circuits, Rudolf Graf, Tab Books, p. 464, Monostable Circuit, 1985.

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