Two wire heater regulator control circuit having continuous temp

Details Two wire heater regulator control circuit having continuous temp Two wire heater regulator control circuit having continuous temp

1984-11-23

1985-11-19

Paschall, M. H.

Electric heating

Heating devices

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

219501, 219499, 219505, 323235, 323365, H05B 102

Patent

active

045544395

ABSTRACT:
A heater control circuit functions in conjunction with a suitable heating coil to provide precision, automatic temperature regulation. The combination of heating and temperature sensing functions into a single system results in a two-wire heater regulator control circuit in which a continuous excitation voltage and a power voltage can be simultaneously present at the heater coil. Temperature of the heater is established by continuous excitation and sensing independent of the occurrence of power for heating. A short circuit protection circuit is responsive to an electrical short in the heater coil (which significantly changes its resistance with temperature) and disables the power voltage.

REFERENCES:
patent: 3946198 (1976-03-01), Foote
patent: 4002882 (1977-01-01), McCutchen
patent: 4272671 (1981-06-01), Hukagawa et al.
patent: 4278872 (1981-07-01), Koether et al.
patent: 4314143 (1982-02-01), Bilstad et al.
patent: 4359626 (1982-11-01), Potter

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