Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1998-03-02
1999-11-23
Vu, David H.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315241S, 396205, 396206, H05B 3700
Patent
active
059906316
ABSTRACT:
In a current cut-off type automated stroboscope circuit which controls a flashlight intensity by cutting off the current flowing through a flash lamp, a high-speed semiconductor switching device inserted in series with respect to the stroboscopic tube has been encountered up to now with malfunction and breakdown problems induced by chattering. To solve aforesaid problems, the present invention is to provide a xenon tube 1 with an IGBT 2 connected in series with respect to the xenon tube 1. The gate electrode of the IGBT is connected to two pnp-type transistors Q1 and Q2 substantially inbetween, both transistors of which are connected in series with respect to each other. The IGBT is controlled by turning on and turning off of the transistors Q1 and Q2. Furthermore, a time constant circuit which is formed of a capacitor C1 and a resistor R1 is connected to the transistor Q1. A gate voltage is applied to the IGBT 2 only for a certain period of time (one shot) which is defined by a time constant of CR product.
REFERENCES:
patent: 4951081 (1990-08-01), Hosomizu et al.
patent: 5159381 (1992-10-01), Harrison
patent: 5661372 (1997-08-01), Ishimaru et al.
Hioki Tatsuya
Sekido Keizo
Creighton Wray James
Narasimhan Meera P.
Stanley Electric Co. Ltd.
Vu David H.
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