Control apparatus for thermal equipment particularly a heat engi

Details Control apparatus for thermal equipment particularly a heat engi Control apparatus for thermal equipment particularly a heat engi

1980-09-24

1983-02-22

Reynolds, B. A.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219511, 219494, 219501, 219513, H05B 102

Patent

active

043750290

ABSTRACT:
The invention relates to control apparatus for heat actuated devices of the type having a heating resistor and a spring biased motor member movable in response to heat generated by the resistor. A source of rectified AC voltage for the heating resistor is regulated by a controlled rectifier in series with the resistor. There is a comparator circuit for comparing a desired setting with the actual position of the motor member and generating a continuously variable control signal of a value corresponding to the departure value. An ignition circuit for pulsing the controlled rectifier has inputs including the control signal, a half wave AC voltage and a time dependent decreasing signal. The ignition circuit has an input threshold below which pulses are generated and above which pulses are not generated.

REFERENCES:
patent: 3335263 (1967-08-01), Jewell et al.
patent: 3553429 (1971-01-01), Nelson
patent: 3633094 (1972-01-01), Clements
patent: 3702921 (1972-11-01), Thelen
patent: 3784843 (1974-01-01), Gustos
patent: 4081936 (1978-04-01), Stove
patent: 4088871 (1978-05-01), Coulmance et al.
"How to Design and use Multivibrators", by Hall, Copyright 1974.

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