Control circuit for a motor driven automatic valve

Details Control circuit for a motor driven automatic valve Control circuit for a motor driven automatic valve

1979-10-12

1981-01-20

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Limit or end-stop control

318466, 318286, G05G 500

Patent

active

042465265

ABSTRACT:
A motor driven valve control circuit includes an electronic switch element biased to conduct by a resistor connected by diodes to both poles of a switch. A relay controlled by one pole of the switch determines the direction of connection of the motor in series with the element. A thyristor connected to shunt the bias current away from the switch element is gated by a voltage comparator comparing the voltage across a motor current sensing element with a reference voltage, so as to fire the thyristor when the motor current exceeds a set limit. The circuit eliminates the need for latching limit switches usually employed in motor driven valve controls.

REFERENCES:
patent: 3633088 (1972-01-01), Kupersmith
patent: 3668496 (1972-06-01), Markowitz et al.
patent: 4087728 (1978-05-01), Porter

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