Electronic flash unit

Details Electronic flash unit Electronic flash unit

1991-03-27

1992-04-21

Hix, L. T.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

3541451, 315241P, G03B 700

Patent

active

051072920

ABSTRACT:
In an electronic flash unit, a voltage applying device is provided to apply a predetermined voltage to the gate of an insulated gate bipolar transistor (IGBT), connected in series with a flash tube, for controlling the light-emission operation of the flash tube. The voltage applying device produces the predetermined voltage in response to the start of the operation of a DC high voltage power source. Thus, the voltage applying device applies a driving voltage to the gate of the IGBT without responding to a light-emission command signal. The IGBT enters a conduction standby state in response to the start of the operation of the DC high voltage power source, and is placed in a fully `on` state when a trigger circuit is operated by the light-emission command signal. The driving voltage can be applied to the gate in a very simple arrangement which does not require to respond to the trigger signal.

REFERENCES:
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 4999663 (1989-12-01), Nakamura

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