Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1976-11-19
1978-01-10
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315225, 320 1, H05B 4132
Patent
active
040681513
ABSTRACT:
A simplified voltage regulating circuit is provided for controlling the operation of a d-c to d-c converter oscillator as is commonly used in an electronic flash. The voltage regulating circuit controls the operation of the d-c to d-c converter so that the output voltage from the oscillator is maintained within a prescribed range. The voltage regulating control circuitry includes an ordinary transistor controlled by way of an output voltage sensing zener diode which operates to turn on the transistor and thereby terminate operation of the oscillator when the output voltage therefrom reaches its maximum value within the prescribed range. A capacitor is also charged by way of the transistor when it turns on and the residual charge of the capacitor thereafter operates regardless of the non-conductive state thereafter assumed by the zener diode and transistor to maintain the oscillator off until the output voltage from the oscillator decays to its minimum value within the prescribed range.
REFERENCES:
patent: 3012181 (1961-05-01), Schultz
patent: 3777212 (1973-12-01), Mashimo
patent: 3822393 (1974-07-01), Karpol
patent: 3863128 (1975-01-01), Wilwerding
LaRoche Eugene R.
Polaroid Corporation
Roman Edward S.
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