Small offline power supply

Details Small offline power supply Small offline power supply

Filed on

1997-04-16

Date issued

1998-09-08

Examiner

Berhane, Adolf

Patent Class

Electric power conversion systems

SubClass

Current conversion

SubSubClass

Including d.c.-a.c.-d.c. converter

Other Related Categories

363 17, 363 98, H02M 3337

Type

Patent

Status

active

Patent number

058054332

Description

ABSTRACT:
A power supply includes a half bridge transistor circuit coupled across a DC bus, where the half bridge transistor circuit includes a high-side transistor and a low-side transistor and produces an output pulse width modulation (PWM) signal and a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal. The first control PWM signal is coupled to a control terminal of the high-side transistor and the second control PWM signal is coupled to a control terminal of the low-side transistor. The power supply also includes a low pass filter for receiving the output PWM signal and producing a DC output voltage therefrom across a pair of output terminals and a programmable voltage regulating device having an input terminal coupled to the DC output voltage and an output terminal coupled to the external threshold voltage.

REFERENCES:
patent: 4506318 (1985-03-01), Nilssen
patent: 4729081 (1988-03-01), Nilssen
patent: 4939427 (1990-07-01), Nilssen
patent: 4947309 (1990-08-01), Jonsson
patent: 5039919 (1991-08-01), Nilssen
patent: 5083255 (1992-01-01), Nilssen
patent: 5180950 (1993-01-01), Nilssen
patent: 5229927 (1993-07-01), Vila-Masot et al.
patent: 5303137 (1994-04-01), Peterson
patent: 5666280 (1997-09-01), Janaswamy et al.

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