DC-to-DC converter having improved power supply arrangement

Details DC-to-DC converter having improved power supply arrangement DC-to-DC converter having improved power supply arrangement

1989-03-07

1990-05-01

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, H02M 3335

Patent

active

049223992

ABSTRACT:
In order to effectively reduce power consumption in a power supply arrangement for use in a dc-to-dc converter, a series circuit consisting of a resistor and a first and second Zener diodes, is provided between two input terminals of the dc-to-dc converter. The series circuit defines two junctions one of which is between the resistor and the first Zener diode and the other of which is between the first and second Zener diodes. A transistor switching controller has two input terminals coupled across the above-mentioned two Zener diodes. A three-terminal voltage regulator has an input coupled to receive power supply from a transformer, an output coupled to the first junction of the series circuit, and a ground terminal coupled to the second junction. A rated input voltage of the three-terminal voltage regulator is essentially raised by connecting the ground terminal to the second junction, whereby an excessive voltage protection circuit with inherent power consumption characteristics can be removed from the input side of the three-terminal voltage regulator.

REFERENCES:
patent: 4037271 (1977-07-01), Keller
patent: 4156273 (1979-05-01), Sato
patent: 4459651 (1984-07-01), Fenter
patent: 4497017 (1985-01-01), Davis
patent: 4623960 (1986-11-01), Eng

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