AC-DC transfer standard overload protection circuit

Details AC-DC transfer standard overload protection circuit AC-DC transfer standard overload protection circuit

1987-03-03

1988-03-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 91, H01H 504

Patent

active

047333227

ABSTRACT:
An overload protection circuit for an AC-DC transfer standard employing a thermoelement comprising a heater element and a temperature sensor. A first differentiator provides an output that is a function of the voltage across the heater element. A second differentiator produces an output that is a function of the output of the first differentiator. Further including a circuit creating an overload signal provided, which is responsive to the outputs of the first and second differentiators.

REFERENCES:
patent: 4063301 (1977-12-01), Lye
patent: 4193104 (1980-03-01), Nercessian
patent: 4495405 (1985-01-01), Foster
Model 1600A-MOD88 Instruction Manual by Ballantine Lab. Inc., May-1984.
BIFET Products by Texas Instruments, p. 3425.

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