Inductor with centertap switching transistor for reduced radio f

Details Inductor with centertap switching transistor for reduced radio f Inductor with centertap switching transistor for reduced radio f

1987-09-30

1990-11-20

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

363 21, 363 56, H02H 324

Patent

active

049722921

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 switching 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: 3735236 (1973-05-01), Richter et al.
patent: 4377842 (1983-03-01), Camsier
patent: 4607322 (1986-08-01), Henderson
patent: 4639663 (1987-01-01), Ueno et al.
patent: 4736264 (1988-04-01), Segger
patent: 4736284 (1988-04-01), Yamagishi et al.

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