Flash charging circuit

Details Flash charging circuit Flash charging circuit

1996-07-11

1999-04-20

Leja, Ronald W.

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

307107, 307108, 307109, 363 15, 363 56, 363 24, H02M 3337

Patent

active

058959831

ABSTRACT:
A flash charging circuit has first and second transistors (TR1, TR2) which are connected to opposite terminals of a primary coil of a transformer, a battery is connected to a center tap provided in a middle portion of the primary coil, and first and second drive pulse signals (S1, S2) are applied to the first and second transistors to drive them alternately with each other, to induce an alternating secondary current in a secondary coil of the transformer. Each of the first and second drive pulse signals have a shorter pulse duration (Pd) than a pulse separation (Ps). The phases of the first and second drive pulse signals are determined such that both the first and second drive pulse signals take a low level for a time (Ta) before and after each drive pulse of the first and second drive pulse signals, so that both the first and second transistors are OFF immediately before either of them is turned ON.

REFERENCES:
patent: 3869658 (1975-03-01), Hanke et al.
patent: 4307440 (1981-12-01), Inoue et al.
patent: 4818892 (1989-04-01), Oohashi et al.
patent: 5068775 (1991-11-01), Borgatti et al.
patent: 5140513 (1992-08-01), Yokoyama
patent: 5510974 (1996-04-01), Gu et al.

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