Electronic flash device and camera equipped with said device

Details Electronic flash device and camera equipped with said device Electronic flash device and camera equipped with said device

1996-09-20

1997-10-14

Adams, Russell E.

Photography

With object illumination for exposure

With power supply detail

396156, 396206, G03B 726

Patent

active

056780770

ABSTRACT:
The oscillating switching element of step-up transformer comprises a dedicated high-frequency FET and is placed between center tap of the primary coil and the ground of the primary circuit. Terminal of the primary coil on the side of the ground is connected to the connection point between xenon tube and the light emission controlling switching element, i.e., an IGBT, via diode. Charge voltage of main capacitor is detected by voltage detection circuit, and when charge voltage is below threshold voltage, controller drives the IGBT at a low frequency, while when charge voltage has exceeded threshold voltage, it drives the FET at a high frequency to charge main capacitor. The charging of main capacitor is made faster and more efficient by changing the switching frequency and by switching the switching element between the IGBT and the FET as charge voltage increases.

REFERENCES:
patent: 4236796 (1980-12-01), Hayashi et al.
patent: 4566769 (1986-01-01), Inoue
patent: 4610521 (1986-09-01), Inoue
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 4999663 (1991-03-01), Nakamura
patent: 5068575 (1991-11-01), Dunsmore et al.
patent: 5101335 (1992-03-01), Ludden et al.
patent: 5249007 (1993-09-01), Tanaka
patent: 5250977 (1993-10-01), Tanaka

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