Transistor drive control for a multiple input D.C. to D.C. conve

Details Transistor drive control for a multiple input D.C. to D.C. conve Transistor drive control for a multiple input D.C. to D.C. conve

1980-11-17

1982-02-02

Shoop, William M.

Electric power conversion systems

Current conversion

With means to connect the input to diverse power sources

363 22, 363 56, 363133, H02M 3335

Patent

active

043143270

ABSTRACT:
A D.C. to D.C. voltage converter is disclosed that operates with various applied D.C. input voltages, each having a different voltage level, to develop a desired D.C. output voltage. The D.C. to D.C. voltage converter has a saturable transformer that is sequentially excited into its positive and negative saturation conditions under control of sequentially operating first and second transistor diode combinations. The D.C. to D.C. converter has a base drive current circuit comprised of a full-wave rectifier and a multiple level current limiting circuit. The base drive current circuit is interposed between a base drive winding of the saturable transformer and the base electrodes of the transistors of first and second transistor diode combinations. The base drive circuit adapts the saturation condition of the first and second transistor diode combinations to the level of the applied D.C. input voltages so as to reduce the level of increase of the commutational losses of the transistor-diode combination that may otherwise occur for increases in the level of the applied D.C. input voltages.

REFERENCES:
patent: 3689825 (1972-09-01), Mason et al.
patent: 3889173 (1975-06-01), Klusmann et al.
patent: 3947754 (1976-03-01), Wechsler
patent: 4187536 (1980-02-01), Govaert et al.
Abraham I. Pressman, Switching and Linear Power Supply, Power Converter Design, paragraph 2.4.2.

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