Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1991-05-22
1992-07-14
Perkey, W. B.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
315241P, G03B 1505
Patent
active
051307383
ABSTRACT:
An I.G.B.T. (Insulated Gate Bipolar Transistor) driven electronic flash unit includes a control switch for controlling an off-operation of the I.G.B.T. The control switch has a first terminal for receiving a light-emission stopping command of a very short pulse width, a second terminal supplied with a collector electrode voltage of the I.G.B.T. connected in series with a flash tube, third and fourth terminals respectively connected with gate and emitter electrodes of the I.G.B.T., which short-circuits the third and fourth terminals upon receiving the light-emission stopping command at the first terminal, and maintains the short-circuit operation as long as it receives the collector electrode voltage of the I.G.B.T. at the second terminal.
REFERENCES:
patent: 4697906 (1987-10-01), Kobayashi et al.
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 5038080 (1991-08-01), Hirata
Perkey W. B.
Spyrou Cassandra C.
West Electric Co. Ltd.
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