Electronic flash control circuit

Details Electronic flash control circuit Electronic flash control circuit

1990-05-23

1992-10-27

Adams, Russell E.

3541451, G03B 1505

Patent

active

051593815

ABSTRACT:
An improved electrical circuit for controlling the firing time of an electronic flash tube. The electrical circuit includes a storage capacitor that is chargeable by a suitable power source, a flash tube and an insulated gate bipolar transistor (IGBT), which can be activated between conductive and non-conductive states, that is connected in the discharge path of the storage capacitor through the flash tube. A signal responsive to a flash firing command is applied to the flash tube to initiate flash tube firing after the IGBT has been activated from its non-conductive to its conductive state. A flash terminating command is subsequently applied to the IGBT to terminate flash firing. The flash firing command and the flash terminating command are made independent of one another. By making these commands independent of one another, any undesirable effects of one or more electrical characteristics of the IGBT on flash tube firing is thereby eliminated.

REFERENCES:
patent: 3415644 (1968-12-01), Land
patent: 3753392 (1973-08-01), Land
patent: 3942183 (1976-03-01), Whiteside
patent: 4243309 (1981-01-01), Johnson et al.
patent: 4697906 (1987-10-01), Kobayashi et al.
patent: 4839686 (1989-06-01), Hozomizu et al.
patent: 4894678 (1990-01-01), Farrington et al.
patent: 4951081 (1990-08-01), Hosomiza et al.

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