High capacity dc-dc voltage converter suitable for charging elec

Details High capacity dc-dc voltage converter suitable for charging elec High capacity dc-dc voltage converter suitable for charging elec

1982-09-23

1984-12-18

Shoop, William M.

Electric power conversion systems

Current conversion

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

363134, H02M 3335

Patent

active

044893701

ABSTRACT:
A portable, battery-powered high capacity dc-dc voltage converter suitable for charging capacitor-based devices such as electronic camera flash lamps is disclosed. The voltage converter utilizes two high frequency metal oxide semiconductor field effect power transistors which are driven in a push-pull arrangement by an emitter-follower full wave bridge circuit. The transistors drive a low leakage inductance toroidal ferrite-core power transformer at a frequency which is sufficiently high to avoid saturation of the transformer, resulting in high efficiency and low power consumption. The output of the transformer is rectified to produce a high capacity dc charging signal on the order of 300 volts with a maximum current of 28 amps. The voltage converter is capable of recharging commercially available inexpensive electronic 100-watt flash lamps at a rate of once every 1.8 seconds, compared with a rate of 15 seconds for comparable prior art self-contained charging units.

REFERENCES:
patent: 4070701 (1978-01-01), Harnden, Jr. et al.
P. Regan & P. Dewsbury, "Designs for VMOS Push-Pull Converters," May 1980, Electronic Engineering, vol. 52, No. 638, pp. 87-92, 96.

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