Abstract
A simple, push-pull transistorised DC-DC inverter is described, in which very high efficiency is obtained over a wide range of load currents. 'No-load' current is kept to a minimum by a novel feedback arrangement, making the inverter a suitable replacement for the now unobtainable layer-type HT (B) battery. Two circuit examples, for converting 6 V to 130 V, are fully described, one optimised for best conversion efficiency (exceeding 80% for 0.3 to 30 mA output current) with low no-load input current (<or=1 mA at 6 V), the other optimised for small size of transformer (18 mm pot core), and careful filtering giving <or=3 mV RMS of oscillation voltage on the input and output leads. Graphs are presented to show conversion efficiency and operating frequency over three decades of output load current. Completed units have been used in current sources for iontophoresis, electromyography, and general purpose neurological teaching.
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