Time proportional control means with a variable time constant

Details Time proportional control means with a variable time constant Time proportional control means with a variable time constant

1978-04-06

1979-10-30

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 97, 219492, 320 1, H05B 102

Patent

active

041729820

ABSTRACT:
A condition responsive time proportional control means which has a relatively fast time constant when operating in its proportional band has the time constant expanded by means of a digital counter. The counter is a resettable unidirectional type counter. The output of the counter drives a switch means and a load along with a means for altering the time constant of the condition responsive time proportional control means. The time constant is altered by a switching means that changes the charge and discharge path of a capacitor used in creating the time constant.

REFERENCES:
patent: 3523182 (1970-08-01), Phillips
patent: 3873906 (1975-03-01), Perlman
patent: 3964677 (1976-06-01), Schalow

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