Control circuit

Details Control circuit Control circuit

1974-12-09

1976-08-31

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307252F, 328 4, 340244C, H03K 1700

Patent

active

039783529

ABSTRACT:
A circuit for maintaining any medium between two predetermined limits, as for example, the water level in a sump. Current to drive the sump pump is gated through a programmable unijunction transistor which transistor is turned on by a signal from an upper limit probe in the sump which is activated by the water level reaching the probe position. When the transistor turns on it activates another portion of the circuit also utilizing programmable unijunction transistors which operates to turn off the first transistor in response to a signal from a lower limit probe positioned in the sump at a lower level. Silicon controlled rectifiers or transistor regenerative switch circuits may be substituted for the unijunction transistors.

REFERENCES:
patent: 3206615 (1965-09-01), Pointe
patent: 3732435 (1973-08-01), Strandberg, Jr. et al.
patent: 3787733 (1974-01-01), Peters
patent: 3858102 (1974-12-01), Quinn

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