Power supply unit

Details Power supply unit Power supply unit

1998-03-25

1999-03-16

Nguyen, Matthew

Electricity: power supply or regulation systems

Output level responsive

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

361 18, G05F 1569, H02H 700

Patent

active

058835040

ABSTRACT:
A power supply unit has a transistor and a resistor circuit connected in series between a power source line and a reference potential point. The node between the transistor and the resistor circuit is connected to an output terminal. A capacitor is connected between the output terminal and the reference potential point. In response to the activation of a starting switch, the transistor is turned on. The power supply unit further has a delay circuit for delaying a rise in the voltage at a predetermined point in the resistor circuit, a current limiting circuit for limiting the current flowing through the transistor, and a current limiting level control circuit for controlling, in accordance with the output of the delay circuit, the level to which the current limiting circuit limits the current. Thus, output of an unduly large current is suppressed when the power supply unit is started up in response to the activation of the starting switch.

REFERENCES:
patent: 4019096 (1977-04-01), Bullinga
patent: 4891728 (1990-01-01), Preis et al.
patent: 4937697 (1990-06-01), Edwards et al.
patent: 5214359 (1993-05-01), Herndon et al.
patent: 5619127 (1997-04-01), Warizaya

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