Diagnostic circuit for units providing current control and prote

Details Diagnostic circuit for units providing current control and prote Diagnostic circuit for units providing current control and prote

1989-12-06

1991-04-16

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

261 98, 261101, 307310, H02N 3087

Patent

active

050087711

ABSTRACT:
The diagnostic circuit comprises a comparator having a first input connected to the power device and a second input connected to a reference voltage generator. A signal generator is connected to the output of comparator so as to generate a diagnostic signal when comparator detects a current in the power device which is higher than a preset value corresponding to said reference voltage. A thermal protection unit sensitive to the temperature of the power device acts on the reference voltage generator so as to reduce the value of said reference voltage in response to an increase in the temperature beyond a preset limit.

REFERENCES:
patent: 4698655 (1987-10-01), Schultz
patent: 4703390 (1987-10-01), Fay et al.

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