Pulse width modulated DC-to-DC power converter using a single en

Details Pulse width modulated DC-to-DC power converter using a single en Pulse width modulated DC-to-DC power converter using a single en

1975-10-02

1977-04-26

Beha, Jr., William H.

H02P 1322, H02M 118

Patent

active

040204081

ABSTRACT:
A pulse width modulated DC-to-DC power converter wherein a single ended transformer circuit includes a single switch transistor at the input and a rectifier at the output. A control circuit to the switch transistor base is powered by a drive winding on the transformer which is shunted by the primary winding of a saturable reactor. A regenerative winding opposing, and in series with, the drive winding provides the regenerative drive necessary to support oscillation of the circuit at a frequency determined by the saturation period of the saturable reactor. A resistor between the drive winding and the saturable reactor establishes both the magnitude of the drive current and the magnetizing current of the transformer. Pulse width modulation of the DC output is attained by a single, isolated DC voltage at the secondary of the saturable reactor. Supplemental circuitry provides for regulation of the isolated DC voltage to produce a constant output voltage and for protection of the switch transistor against overloads.

REFERENCES:
patent: 3064177 (1962-11-01), Bender
patent: 3069612 (1962-12-01), Hamilton
patent: 3292104 (1966-12-01), Kitchin
patent: 3419781 (1968-12-01), Jullien-Davin
patent: 3435320 (1969-03-01), Lee et al.
patent: 3697851 (1972-10-01), Mast
patent: 3725739 (1973-04-01), Griffey
patent: 3771040 (1963-11-01), Fletcher et al.
patent: 3824450 (1974-07-01), Johnson et al.

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