Electronic flash device

Details Electronic flash device Electronic flash device

1997-12-17

1999-12-21

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315241P, 315243, 396159, 396164, H04B 4114

Patent

active

060053526

ABSTRACT:
An electronic flash device includes a first DC--DC converter circuit of separately-excited type, a second DC--DC converter circuit of separately-excited type, a capacitor to be charged by the first DC--DC converter circuit and the second DC--DC converter circuit, and a discharge tube which converts charging energy charged to the capacitor into light energy. The first DC--DC converter circuit includes a first switching element having a first control electrode, and an a first oscillation transformer to which energization is controlled by the first switching element. A first control pulse signal is supplied to the first control electrode. The second DC--DC converter circuit includes a second switching element having a second control electrode, and an a second oscillation transformer to which energization is controlled by the second switching element. A second control pulse signal is supplied to the second control electrode. The first DC--DC converter circuit and the second DC--DC converter circuit are connected in parallel, and the first and second control pulses are supplied such that the second control electrode changes from a non-energizing state to an energizing state before the first control electrode changes from an energizing state to a non-energizing state.

REFERENCES:
patent: 4441774 (1984-04-01), Kazami et al.
patent: 4758937 (1988-07-01), Usui et al.
patent: 4847538 (1989-07-01), Iwata et al.
patent: 5309344 (1994-05-01), Smith
patent: 5684683 (1997-11-01), Divan et al.
patent: 5847550 (1998-12-01), Schie et al.

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