公开(公告)号：DE2422201A1

公开(公告)日：1975-01-16

申请号：DE2422201

申请日：1974-05-08

Applicant: IBM

Inventor： DESKEVICH STEPHEN ,  PEACOCK JAMES CRAWFORD ,  TYNAN RICHARD FRANCIS ,  WILSON ALAN DICKSON

IPC: H05B41/30 ,  H05B41/32

Abstract: Charging circuit for a flash lamp in which flash holdover is prevented by establishing a high impedance charging circuit for a predetermined time after flash initiation to allow deionization of the lamp plasma and, after a predetermined time, establishing a low impedance charging circuit to provide a fast charging rate for the energy storage device. Impedance levels are changed in the circuit by gating a silicon controlled rectifier (SCR) with a control signal a predetermined time after flash initiation so as to bypass a high impedance circuit path in parallel therewith. As the energy storage device becomes fully charged, the SCR returns to its blocking condition, the control signal terminates and the lamp can be fired again.