Stabilized power supply unit having a current limiting function

Details Stabilized power supply unit having a current limiting function Stabilized power supply unit having a current limiting function

2005-05-24

2005-05-24

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S277000, C323S908000

Reexamination Certificate

active

06897638

ABSTRACT:
In a stabilized power supply unit having a current limiting function, the unit is designed to have a steep over-current dropping characteristic. This minimizes the over-current region, prevents oscillation during a startup, and limits inrush current during a start up within a predetermined range. The output voltage of the power supply unit provides a constant output voltage by controlling an output transistor by means of a differential amplifier amplifying the difference between a reference voltage and an output feedback voltage. The power supply unit has a first high-gain, slow-response type current limiting circuit that outputs a first current limiting signal when the output current of the power supply unit exceeds a predetermined level, and a second low-gain, quick-response type current limiting circuit that outputs a second current limiting signal when the outputs exceeds the predetermined level.

REFERENCES:
patent: 4731574 (1988-03-01), Melbert
patent: 4814687 (1989-03-01), Walker
patent: 5747975 (1998-05-01), Colandrea et al.
patent: 6246555 (2001-06-01), Tham
patent: 6806692 (2004-10-01), Lee

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