Self-excited oscillation type power supply device

Details Self-excited oscillation type power supply device Self-excited oscillation type power supply device

1997-05-29

1998-08-18

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

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

G05F 140

Patent

active

057962413

ABSTRACT:
A self-excited oscillation type power supply device comprises an auxiliary transistor Q4. When the device is started, a voltage signal providing forward biasis applied to the base of the auxiliary transistor; and when the device is operated, besides the forward bias, at least one of a voltage signal derived from alternate voltage which occurs at a choke coil L1 and a voltage signal corresponding to output voltage, is applied thereto. More specifically, the voltage signal providing forward bias is provided by a resistor R9 connected between the base of the auxiliary transistor Q4 and input terminal 1; the voltage signal derived from the alternate voltage is provided by a capacitor C4 connected between the base of the auxiliary transistor Q4 and one end of a choke coil L1; and the voltage signal corresponding to output voltage is provided by a constant-voltage diode DZ2 connected between the base of the auxiliary transistor Q4 and output terminal 2.

REFERENCES:
patent: 4242629 (1980-12-01), Shuey
patent: 5389871 (1995-02-01), Otake
patent: 5523936 (1996-06-01), Leu et al.

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