Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1979-01-04
1981-02-03
Hix, L. T.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
H05B 4129
Patent
active
042491100
ABSTRACT:
A first circuit arrangement including a zener diode coupled to the base of a transistor for keeping the transistor turned ON in response to the magnitude of voltage developed across a storage capacitor. The capacitor provides power to a photographic flash tube connected in series with a silicon controlled rectifier (SCR). After the flash tube is ignited, energy is drained from the charged capacitor until its voltage level reaches a predetermined magnitude at which time the zener diode becomes non-conducting, turning OFF the transistor, which causes a commutation of the SCR, terminating the flash of the flash tube. The capacitor is then recharged for preparation of the next flash operation.
A second circuit arrangement utilizes a programmable unijunction transistor in which the voltage magnitude of the flash storage capacitor is followed by the gate of the unijunction transistor until the gate voltage reaches a corresponding voltage level preset at the anode of the unijunction transistor. The preset voltage level is a stored voltage which is proportional to the capacitor voltage immediately prior to flash actuation.
REFERENCES:
patent: 3644818 (1972-02-01), Paget
patent: 3863128 (1975-01-01), Wilwerding
patent: 3914647 (1975-10-01), Broekstra et al.
patent: 3971049 (1976-07-01), Ohmori et al.
patent: 4012665 (1977-03-01), Nakamura et al.
Hix L. T,.
Perkey William B.
Rollei of America, Inc.
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