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FLASH LAMP POWER SUPPLY CIRCUIT

IP.com Disclosure Number: IPCOM000025370D
Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 shows a two level power supply circuit for energizing a flash lamp 10. Capacitors 12 and 14 are charged from an AC input source via a grounded center-tapped transformer 16. The combined voltage across capacitors 12 and 14 is higher than the voltage ratings of SCRs 18 and 20. This combined capacitor voltage is divided approximately in half between the 2 capacitors to provide a voltage well within the safe operating range of either SCR 18 or 20. The lamp is triggered into operation by trigger circuit 22. Following discharge by the capacitor, each capacitor is quenched independently. This arrangement permits low voltage SCRs to be used.

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Page 1 of 4

FLASH LAMP POWER SUPPLY CIRCUIT Proposed Stephen C. Corona Classification

U.S. CI. 355/68 Int. C1. C03b 27/74

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40 1

Volume 9 Number 6 November/December 1984

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FLASH LAMP POWER SUPPLY CIRCUIT (Cont'd)

402 XEROX DISCLOSURE JOURNAL

Volume 9 Number 6 November/December 1984

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

Page 3 of 4

FLASH LAMP POWER SUPPLY CIRCUIT (Cont'd)

Figure 1 shows a two level power supply circuit for energizing a flash lamp 10. Capacitors 12 and 14 are charged from an AC input source via a grounded center- tapped transformer 16. The combined voltage across capacitors 12 and 14 is higher than the voltage ratings of SCRs 18 and 20. This combined capacitor voltage is divided approximately in half between the 2 capacitors to provide a voltage well within the safe operating range of either SCR 18 or 20. The lamp is triggered into operation by trigger circuit 22. Following discharge by the capacitor, each capacitor is quenched independently. This arrangement permits low voltage SCRs to be used.

Figure 2 shows a variation of the circuit of Figure 1 having separate power supply driving circuits 24, 26. If power supply 26 was not enabled, power supply 24 would charge only capacitor 12 and the lamp would operate at half voltage (and half power). The discharge path of capacitor 12 would then be through diode 30.

     XEROX DISCLOSURE JOURNAL Volume 9 Number 6 Novemher/December 1984 403...