Overcurrent protection circuit

Details Overcurrent protection circuit Overcurrent protection circuit

2007-10-30

2007-10-30

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C323S277000, C323S273000

Reexamination Certificate

active

10996746

ABSTRACT:
An overcurrent protection circuit has an output voltage detection resistor for detecting an output voltage. A foldback overcurrent protection circuit detects an output current flowing through an output transistor and controls the output current flowing through the output transistor in accordance with the detected output current. A first logic generating circuit receives an overcurrent detection signal from the foldback overcurrent protection circuit corresponding to the detected output current. A second logic generating circuit receives a detection signal from the output voltage detection resistor corresponding to a decrease in the detected output voltage. An AND circuit receives and processes an overcurrent delay signal generated by the first logic generating circuit and a voltage detection signal generated by the second logic generating circuit. A negative voltage generating circuit receives an output from the AND circuit and outputs a negative voltage to the foldback overcurrent protection circuit to control the output current flowing through the output transistor.

REFERENCES:
patent: 5666044 (1997-09-01), Tuozzolo
patent: 6222355 (2001-04-01), Ohshima et al.
patent: 7079368 (2006-07-01), Ishikawa et al.
patent: 406209584 (1993-01-01), None

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