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SERIES OPERATION OF QUENCH SCRS

IP.com Disclosure Number: IPCOM000025319D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 56K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure shows a power supply circuit 8 for a flash lamp 10. The power supply voltage is controlled so that at least half of the stored energy will be used in the flash lamp. Assuming an operating voltage of 2500 volts, the maximum voltage of capacitor 12 at time of quench is .707 (2500) or 1768 volts. The voltage across the lamp at this point in time is less than 1768 volts since part of this voltage is across coil 14. If the SCRs 16 and 18 are each capable of blocking half of the initial maximum voltage of 2500 volts, and inductor 14 is chosen so that at the worst case quench time it has a voltage drop (1768 - 2/2500 = 518 volts), then it is possible to

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XEROX DISCLOSURE JOURNAL

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SERIES OPERATION OF QUENCH SCRS Lawrence J. Mason
Thomas J. Hammond

Proposed Classification
U.S. Cl. 355/68 Int. Cl. G03b 27/74

-

T

I"

- $20

18

The figure shows a power supply circuit 8 for a flash lamp 10. The power supply voltage is controlled so that at least half of the stored energy will be used in the flash lamp. Assuming an operating voltage of 2500 volts, the maximum voltage of capacitor 12 at time of quench is .707 (2500) or 1768 volts. The voltage across the lamp at this point in time is less than 1768 volts since part of this voltage is across coil 14. If the SCRs 16 and 18 are each capable of blocking half of the initial maximum voltage of 2500 volts, and inductor 14 is chosen so that at the worst case quench time it has a voltage drop (1768 - 2/2500 = 518 volts), then it is possible to

279

Volume 9 Number 4 July/August 1984

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SERIES OPERATION OF QUENCH SCRS (Cont'd)

arrange SCRs 16 and 18 so that only one of them is blocking the remaining voltage on the lamp. Then, if SCR 16 has all the voltage across it, SCR 18 can be turned on without effecting SCR 16. When it is time to quench lamp 10, SCR 16 can be switched on and the lamp current will be directed through SCRs 16 and 18 (provided SCR 18 has been kept in conduction).

280 XEROX DISCLOSURE JOURNAL

Volume 9 Number 4 July/August 1984

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