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Fast Reset Strobe Circuit

IP.com Disclosure Number: IPCOM000073689D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Brookman, JW: AUTHOR [+2]

Abstract

For driving a strobe lamp to erase a previous computer generated image stored on a vidicon target, a fast reset control circuit is provided. This control circuit helps to assure that the strobe lamp always gives the same amount of illumination per flash, regardless of the time between flashes. The fast reset control circuit includes an ideal power source, a source of starting pulses, timing circuit TC, charging capacitor C, strobe lamp L, an SCR, transistor T, resistor R1, and two voltage dividing resistors R2, R3. The power source furnishes a supply voltage E to one side of capacitor C and strobe lamp L. The other side of C is connected to the other side of L, and to the anode of SCR. The cathode of the SCR is in series with the collector of transistor T, the emitter of which is grounded.

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Fast Reset Strobe Circuit

For driving a strobe lamp to erase a previous computer generated image stored on a vidicon target, a fast reset control circuit is provided. This control circuit helps to assure that the strobe lamp always gives the same amount of illumination per flash, regardless of the time between flashes. The fast reset control circuit includes an ideal power source, a source of starting pulses, timing circuit TC, charging capacitor C, strobe lamp L, an SCR, transistor T, resistor R1, and two voltage dividing resistors R2, R3.

The power source furnishes a supply voltage E to one side of capacitor C and strobe lamp L. The other side of C is connected to the other side of L, and to the anode of SCR. The cathode of the SCR is in series with the collector of transistor T, the emitter of which is grounded. The collector of T is connected back to the first side of L via resistor R2, terminal 11 of which is linked to the grounded emitter of T via resistor R3.

The timing circuit TC receives the starting pulses and has its output connected to the triggering element of L, as well as to the cathode of SCR, and to the base of T. The SCR and T are turned off prior to the lamp trigger pulse and remain off until the bulb is deionized. The values of R2 and R3 are selected to supply the desired voltage level for the collector of T, when it is off.

For a strobe lamp L drawing a firing current of 500 amperes, when L fires, it places 500 volts on the anode of SCR and w...