Solid state temperature dependent direct voltage interrupter for

Details Solid state temperature dependent direct voltage interrupter for Solid state temperature dependent direct voltage interrupter for

1989-06-02

1991-02-19

Paschall, M. H.

Electric heating

Heating devices

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

219501, 219494, 219508, 361 54, 361 56, 361 93, 361109, H05B 102

Patent

active

049946510

ABSTRACT:
A temperature limiting device for connection across a common heater which senses the critical temperature of the heater to trip circuit breakers and thereby disrupt power to the heater when the critical temperature exceeds a predetermined value. The device includes an SCR or triac connected across power lines to the heater and which is triggered by a comparator monitoring the output of an integrator circuit. The input to integrator circuit is connected to the output of a thermocouple device. Upon the critical temperature of the heater exceeding the predetermined value as determined by the integrator and comparator circuits the SCR or triac is fired so as to short the voltage lines and thereby open the mechanically resettable circuit breakers.

REFERENCES:
patent: 3569784 (1971-03-01), Carroll
patent: 4168514 (1979-09-01), Howell
patent: 4477855 (1984-10-01), Nakayama et al.
patent: 4658322 (1987-04-01), Rivera
patent: 4687906 (1987-08-01), Fujishima et al.
patent: 4858054 (1989-08-01), Franklin

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