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BOOST VOLTAGE TO ENABLE FLASH LAMP OPERATION

IP.com Disclosure Number: IPCOM000025819D
Original Publication Date: 1988-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 89K

Publishing Venue

Xerox Disclosure Journal

Abstract

Flash lamps have a certain voltage range within which they will operate. If the lamp voltage is lowered beyond the minimum voltage level, the lamp will not operate. The addition of a boost voltage will enable flash lamps to operate at lower than these minimum voltages. The energy required from the boost circuit is minimal. Figure 1 shows a first circuit to furnish boost voltage. The boost voltage supplied by capacitor 10 is held off from dischar *ng throu h the

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XEROX DISCLOSURE JOURNAL

BOOST VOLTAGE TO ENABLE FLASH LAMP OPERATION

Lawrence J. Mason

Proposed Classification

US. C1.355/67
Int.
C1. G03b 27/54

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Volume 13 Number 2 March/April 1988 105

[This page contains 1 picture or other non-text object]

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BOOST VOLTAGE TO ENABLE FLASH LAMP OPERATION (Cont'd)

Flash lamps have a certain voltage range within which they will operate. If the lamp voltage is lowered beyond the minimum voltage level, the lamp will not operate. The addition of a boost voltage will enable flash lamps to operate at lower than these minimum voltages. The energy required from the boost circuit is minimal. Figure 1 shows a first circuit to furnish boost voltage. The boost voltage supplied by capacitor 10 is held off from dischar *ng throu h the

SCR 14 into conduction simultaneously with the triggering of flash lamp 16 will apply the boost voltage across the lamp and initiate lam conduction. The inductor 18 is required to hold up the boost voltage; the in (P uctor is normally contained in the conventional flash power supply.

main storage capacitor 12 by a silicon controlled rectifier (

R CR) 14. (fating

Another alternative circuit to furnish the boost voltage is shown in Figure 2. Here the boost voltage is obtained from the transformer 20 which is operated in the "flyback" mode. Transistor 22 controls a pulse of current through the transformer primary. Upon interruption of this current, the e...