Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1978-04-17
1980-04-08
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315135, 340660, 354127, H05B 4132
Patent
active
041974840
ABSTRACT:
An electronic flash device comprising a DC-DC converter circuit which converts a low voltage DC source to a high voltage DC current for charging a main discharge capacitor, a flash discharge tube which is adapted to flash by means of the energy stored in the main discharge capacitor, and a display circuit. The DC-DC converter circuit includes an oscillation transformer having a primary winding, a secondary winding magnetically connected with the primary winding, an auxiliary winding and further a second auxiliary winding, an oscillation transistor, and an auxiliary capacitor connected with the auxiliary winding for causing the oscillation transistor to be started; and the display circuit is lit for display when the voltage generated across the second auxiliary winding and the voltage applied across the auxiliary capacitor are superposed to reach a predetermined value.
REFERENCES:
patent: 3831079 (1974-08-01), Iwata
patent: 4068150 (1978-01-01), Iwata et al.
LaRoche Eugene R.
West Electric Co. Ltd.
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