Feedback circuit for protecting an integrated circuit with a del

Details Feedback circuit for protecting an integrated circuit with a del Feedback circuit for protecting an integrated circuit with a del

1996-05-24

1997-11-11

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 18, H02H 902

Patent

active

056870515

ABSTRACT:
Circuitry is provided which includes a control circuit formed on an integrated circuit. The control circuit controls an operation of a device. The circuitry further includes a feedback circuit and a protection circuit. The feedback circuit includes a first current source for outputting a small current and a second current source for outputting a larger current. A rectifier is connected between an output of the first and second current sources in order to prevent current from flowing from the output of the first current source toward the output of the second current source. A first voltage regulator is connected between an output of the second current source and ground, while a second voltage regulator is connected between the output of the first current source and an input of the protection circuit. A feedback capacitor is connected in parallel with a feedback current sink, between the output of the first current source and ground. The feedback capacitor serves to both activate the protection circuit 300 after a predetermined delay time has elapsed and to time when that predetermined delay time has elapsed.

REFERENCES:
patent: 5224010 (1993-06-01), Tran et al.
patent: 5367424 (1994-11-01), Even

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