High efficiency battery adapter

Details High efficiency battery adapter High efficiency battery adapter

1987-03-05

1988-05-24

Skudy, R.

Electric power conversion systems

Current conversion

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

363 19, H02M 3335

Patent

active

047470348

ABSTRACT:
Extremely high efficiency is achieved in a DC to DC converter by using a relaxation oscillator in which two transistors alternately conduct current to the primary winding of a step-up transformer. The transistors are interconnected by a resistor and capacitor in series so that when the converter is lightly loaded, the saturable reactor in the circuit will be self-resonant, so as to draw only minimal power from the battery source. The converter also includes a battery charge level monitor circuit that prevents the DC to DC converter from oscillating and thus providing power unless the battery is above a minimum charge level when its voltage is applied to the converter. In a preferred embodiment, the converter provides an output of up to 100 watts.

REFERENCES:
patent: 3487335 (1969-12-01), Lingle
patent: 4287517 (1981-09-01), Nagel
patent: 4338596 (1982-07-01), Huber et al.
patent: 4542450 (1985-09-01), Patel
patent: 4598243 (1986-07-01), Kawakami
patent: 4609850 (1986-09-01), Hamlet
patent: 4626765 (1986-12-01), Tamaka

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