Programmable controller

Details Programmable controller Programmable controller

1978-07-03

1980-06-24

Ruggiero, Joseph F.

Boots, shoes, and leggings

307 41, 3071414, 307350, 364557, G06G 766

Patent

active

042098378

ABSTRACT:
There is disclosed a circuit for generating an error voltage which is proportional to the difference between a desired value of a physical parameter and the actual value of the physical parameter. The circuit operates by alternately switching the current from a source through a fixed reference resistor and a variable resistor, the resistance value of which changes as a function of the physical parameter to be controlled. The current is switched between the two resistors so that the average voltage generated across the variable resistor would be equal to the average voltage generated across the fixed resistor if the physical parameter had the desired value. By determining the difference between the average voltages across the resistors, the error voltage can be generated for controlling the physical parameter.

REFERENCES:
patent: 3790815 (1974-02-01), Karklys
patent: 3922527 (1975-11-01), Witkin et al.
patent: 3984699 (1976-10-01), Bailey
patent: 3988595 (1976-10-01), Eatock

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