DC to DC Converter adjustable dynamically to battery condition

Details DC to DC Converter adjustable dynamically to battery condition DC to DC Converter adjustable dynamically to battery condition

1979-06-08

1981-06-09

Pellinen, A. D.

Electric power conversion systems

Current conversion

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

315241P, 320 39, 323906, 363 80, H05B 4132, H02M 3335, H02J 700

Patent

active

042728061

ABSTRACT:
A battery-powered DC to DC converter is operated dynamically in accordance with the condition of the battery so that an optimum compromise is made between the performance of the battery and the performance of the converter in an application such as charging an electronic strobe flash unit capacitor. A transformer has oppositely wound primary and secondary windings. A switching transistor, serially connected between the primary winding and the battery, interrupts battery current through the primary winding, which causes current to flow through the secondary winding to charge the flash unit capacitor. A voltage-sensing circuit senses the battery open-circuit voltage and the battery load voltage, which varies as a function of the open-circuit voltage and battery internal resistance. A bistable control circuit causes the switching transistor to interrupt the primary winding current when the battery load voltage decreases below a predetermined percentage of the battery open-circuit voltage so the load that the converter places on the battery varies dynamically as a function of battery condition.

REFERENCES:
patent: 3541420 (1970-11-01), Rees
patent: 3588672 (1971-06-01), Wilson
patent: 3590361 (1971-06-01), Bishop et al.
patent: 3846690 (1974-11-01), Colyn
patent: 3938021 (1976-02-01), Kosmin
patent: 4070699 (1978-01-01), Einbinder
patent: 4084103 (1978-04-01), Burns et al.
patent: 4104714 (1978-08-01), Smith et al.
patent: 4124884 (1978-11-01), Episcopo

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