Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-09-26
1999-01-12
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 18, 361 93, 361115, H02H 300
Patent
active
058597573
ABSTRACT:
An output transistor supplies a current based on a drive current to a load. An output voltage is divided by a feedback voltage, and an error amplifier outputs a voltage according to a difference in feedback voltage. Furthermore, the base drive circuit controls a drive current of the output transistor according to an output voltage of the error amplifier. The drive current flows into GND via only the drive current detecting resistor. The short-circuit overcurrent protecting circuit detects an overcurrent based on a terminal based voltage of the drive current detecting resistor, and detects an occurrence of a short circuit by observing a feedback voltage. According to the described arrangement, as the need of the short-circuit detection-use transistor to be biased by the drive current can be eliminated, variations in output voltage of the error amplifier can be suppressed, and improved transient response characteristics can be achieved. As a result, in a drive circuit for use in the DC stabilized power supply circuit provided with the short-circuit overcurrent protecting circuit, improved transient response characteristics can be achieved.
REFERENCES:
patent: 4278930 (1981-07-01), Rogers
patent: 4768142 (1988-08-01), Pasma
patent: 5210479 (1993-05-01), Kimura et al.
patent: 5831471 (1998-11-01), Hanafusa
Hanafusa Koichi
Nakajima Akio
Conlin David G.
Daley, Jr. William J.
Gaffin Jeffrey A.
Jackson Stephen
Sharp Kabushiki Kaisha
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