Electronic flash device

Details Electronic flash device Electronic flash device

1992-04-15

1993-02-16

Mis, David

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315DIG7, H05B 4130

Patent

active

051874105

ABSTRACT:
An electronic flash device includes a flash discharge tube, an IGBT, connected to the flash discharge tube, for controlling light emission, a trigger means for driving the flash discharge tube, an AC voltage generating means having an oscillation transformer for generating an AC voltage from an input voltage, and a power supply section for generating a gate drive voltage for the IGBT from a counter electromotive voltage generated at a terminal of a winding of the oscillation transformer. The electronic flash device further includes an IGBT drive voltage generating means, a first resistor connected between the IGBT drive voltage generating means and a gate of the IGBT, a capacitor having a terminal connected to the IGBT drive voltage generating means and having a capacitance larger than an electrostatic capacitance across the gate and an emitter of the IGBT, a second resistor having a terminal connected to the other terminal of the capacitor and the other terminal connected to the gate of the IGBT and a resistance smaller than that of the first resistor, and a third resistor connected between a ground terminal and a connection terminal between the IGBT drive voltage generating means and the first resistor.

REFERENCES:
patent: 5140201 (1992-08-01), Uenishi

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