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

G - Physics

05

B

340/161

G05B 11/30 (2006.01) G05B 11/28 (2006.01) G05D 23/24 (2006.01)

Patent

CA 1133608

ABSTRACT OF THE DISCLOSURE 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.

321597

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