Control system and method of making the same

Details Control system and method of making the same Control system and method of making the same

1988-09-23

1990-05-01

Paschall, M. H.

Electric heating

Heating devices

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

219508, 219494, 219501, 219413, 340584, H05B 102

Patent

active

049220810

ABSTRACT:
A control system and method of operating the control system are provided, the system having a supervisory circuit for detecting failure of the system and disabling a high energy control circuit of the system, the supervisory circuit having a capacitor therein for sustaining an on condition of a supervisory transistor that is in series with an output relay driver transistor of the high energy control circuit, and a temperature sensing unit that is disposed intermediate a microcomputer of the system and the supervisory circuit for continuing the charging of the capacitor only as long as the temperature sensing unit is sensing an output temperature effect of a heating unit of the system that is below a predetermined high temperature limit for the system and that terminates the charging of the capacitor when the sensed temperature is above the predetermined high temperature limit.

REFERENCES:
patent: 4166944 (1979-09-01), Scott
patent: 4206344 (1980-06-01), Fischer et al.
patent: 4467184 (1984-08-01), Loessel
patent: 4568927 (1986-02-01), Fowler

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