Flashing circuitry

Details Flashing circuitry Flashing circuitry

H - Electricity

05

B

315/25

H05B 41/34 (2006.01)

Patent

CA 1064098

ABSTRACT OF THE DISCLOSURE Electrical circuitry for delivering to a flashtube a series of flash-producing electrical pulses. The circuitry includes energy circuitry for repeatedly storing electrical energy and discharging the energy in the form of such pulses through the flashtube, each pulse producing a flash, each flash being grouped in a flash cycle synchronized with a cycle of an AC voltage source. The energy circuitry comprises first and second capacitors connected by a switching element responsive to the difference between a first voltage at the junction between the first capacitor and the switching element and a second voltage on the second capacitor. The energy circuitry steps up the voltage discharged across the flashtube by the second capacitor. Firing circuitry is provided for receiving during each flash cycle a portion of the energy discharged by the energy circuitry, to initiate each flash. The firing circuitry is timed to initiate the flash, thereby reducing the second voltage upon discharge of the second capacitor, at a time during the period when the first voltage is below the value of the extinction voltage of the flashtube. Thus the switching element remains off during the flash and the flashtube is thereby isolated from the first capacitor during the flash.

254119

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