Electric control apparatus with undervoltage protection

Details Electric control apparatus with undervoltage protection Electric control apparatus with undervoltage protection

1983-07-13

1986-06-03

Paschall, M. H.

Electric heating

Heating devices

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

219508, 219501, 307200A, 361 92, H05B 102

Patent

active

045931801

ABSTRACT:
An electric apparatus involves a temperature sensor and a controlled circuit connected to an A.C. source to be sequentially controlled in accordance with the output from the temperature sensor. The control device comprises an auxiliary power source, a first control circuit for controlling the controlled circuit, and a second control circuit for supplying first control signals to the first control circuit, each being connected between control lines. The second control circuit involves an oscillator for producing clock pulses, a generator for generating reset pulses synchronized with the frequency of the A.C. source, a counter which counts the clock pulses and is reset upon receipt of the reset pulses, a control signal generator which processes an output signal from the temperature sensor to produce the first control signals, and circuit arrangements which, when a momentary power failure takes place in the A.C. source, impress the voltage of the auxiliary power source only on the second control circuit, thereby suppressing the initialization of the second control circuit and preventing the first control signal from being delivered to the first control circuit.

REFERENCES:
patent: 3937937 (1976-02-01), McVey
patent: 4245150 (1981-01-01), Driscoll et al.
patent: 4362923 (1982-12-01), Aoshima
patent: 4438383 (1984-03-01), Etheridge
patent: 4453117 (1984-06-01), Elms et al.

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