Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1990-01-19
1992-01-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315238, 3541451, H05B 3700
Patent
active
050830627
ABSTRACT:
The present invention concerns with the flash device in which the output of an electric power source is boosted by a DC-DC converter, and a main capacitor is charged by the output of the DC-DC converter. In the above-described flash device, to detect the charging state of the main capacitor, a voltage detecting circuit such as voltage dividing resistors is connected in parallel to the main capacitor. For this reason, when the DC-DC converter is rendered inoperative, a problem arises that the electric charges on the main capacitor discharge through the voltage detecting circuit. In the present invention, to eliminate this problem, the flash device is provided with a unilateral conducting element such as diode connected in between the main capacitor and the voltage detecting circuit.
REFERENCES:
patent: Re32425 (1987-05-01), Uchiyama et al.
patent: 4047194 (1977-09-01), Nakamura
patent: 4259615 (1981-03-01), Kashihara
patent: 4349260 (1982-09-01), Ishida
patent: 4385818 (1983-05-01), Kondo
patent: 4457601 (1984-07-01), Kondo
patent: 4591762 (1986-05-01), Nakamura
patent: 4908552 (1990-03-01), Kumakura
Canon Kabushiki Kaisha
LaRoche Eugene R.
Zarabian Amir
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