Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1977-05-19
1979-05-15
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315159, 315151, H05B 4132
Patent
active
041550315
ABSTRACT:
An electronic flash apparatus comprises a discharge circuit and termination circuit for terminating the discharge circuit. The discharge circuit comprises an energy storage capacitor and a series circuit formed of a flash tube and a first switching element connected in parallel to the energy storage capacitor. The first switching element is rendered inoperative by a reverse voltage which is temporarily supplied when energy stored in a commutation capacitor of the termination circuit is discharged by a second switching element. When a prescribed period of time has passed after the first switching element is turned off, the switching element is again put into operation by a retrigger circuit. The commutation capacitor is reversely charged through the flash tube after the first switching element is turned off. The reverse charge is discharged by the retrigger of the first switching element. The discharge of energy stored in the reversely charged commutation capacitor shortens a length of time required for the termination circuit to be charged again through the normal path.
REFERENCES:
patent: 3740610 (1973-06-01), Roncke
patent: 3783336 (1974-01-01), Vital et al.
patent: 3896333 (1975-07-01), Nakamura
patent: 3998534 (1976-12-01), Schulze et al.
La Roche Eugene R.
Toshiba Photo Products Co., Ltd.
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