Control circuits
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United States of America Patent
Stats
-
Sep 20, 1983
Grant Date -
N/A
app pub date -
May 12, 1982
filing date -
May 28, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control circuit for controlling the operation of an electrically powered heating device includes supply terminals for connection to a source of d.c. supply, one of the terminals of the heating device being connected to one supply terminal and the other terminal of the device being connected to the other supply terminal by way of a relay contact. The junction of the contact and device is connected by way of a resistor to one plate of a capacitor the other plate of which is connected to the one supply terminal. A comparator monitors the voltage across the capacitor and controls the operation of a relay winding. The comparator is supplied with a reference voltage which can be equal to the design operating voltage of the heating device, this being less than the nominal supply voltage. The relative values of the two resistors are chosen so that when the supply voltage exceeds the design voltage the power supplied to the heating device is controlled.
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