Modular power supply with variable input voltage and output volt

Details Modular power supply with variable input voltage and output volt Modular power supply with variable input voltage and output volt

1987-09-30

1989-03-21

Salce, Patrick R.

Electric power conversion systems

Current conversion

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

363 71, 307 82, H02M 3335

Patent

active

048149632

ABSTRACT:
There is disclosed herein a modular, high power, flyback transformer based power supply with step up and step down capability. The power supply uses multiple flyback transformers having switching transistors which may be either connected to one terminal of the primary winding or which may be placed in the center of the primary winding. The switching transistors are driven by pulse trains which are out of phase with each other. This results in lowered RMS values for ripple current through the input and output capacitors. The flyback voltage transients may be used to step up or step down the input voltage by varying the pulse width of the pulses in the swicthing pulse trains. In embodiments where the switching transistors are placed in the middle of the primary windings, better suppression of radio frequency emissions and current in safety ground wires is achieved. There is also disclosed a combination of such power supply modules in series or parallel on either the input or output to deliver higher power or higher output voltage or to be able to handle higher levels of D.C. input voltage. There is also disclosed an improved flyback transformer design having substantially lower leakage inductance using coaxial cable as the wire from which the primary and secondary windings are made.

REFERENCES:
patent: 3792286 (1974-02-01), Meier
patent: 4425613 (1984-01-01), Shelly
patent: 4481565 (1984-11-01), Colton
patent: 4665473 (1987-05-01), Onda et al.
patent: 4669039 (1987-05-01), Brakus
patent: 4685039 (1987-08-01), Inou et al.

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