Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1976-01-13
1978-03-21
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
320 1, 315241P, 354145, 363124, H02M 3335
Patent
active
040806464
ABSTRACT:
A chopper circuit arrangement for charging an electronic flash discharge capacitor and for turning off the chopper is disclosed. The arrangement operates from a D.C. source and includes chopper transistors and a transformer operating together as a converter. Regenerative means, including a feedback winding of the transformer, function to charge the flash discharge capacitor. The arrangement includes transistors disposed across the chopper transistors to block or hold the converter off. These blocking transistors are activated when the voltage across the discharge capacitor has achieved a predetermined value. The arrangement includes means for effectuating blocking of the converter only during the off condition of the chopper. The arrangement also includes means for delaying the charge of the discharge capacitor, after discharge, for a predetermined time.
REFERENCES:
patent: 3134066 (1964-05-01), Townsend
patent: 3213344 (1965-10-01), Jensen
patent: 3229158 (1966-01-01), Jensen
patent: 3297960 (1967-01-01), Massey
patent: 3644818 (1972-02-01), Paget
Dietrich Rolf
Gahler Egon
Braun Aktiengesellschaft
Shoop William M.
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