C.Schneider, (Phoenix Contact), J.Przybilla eupec GmbH D-59581 Warstei

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C.Schneider, (Phoenix Contact), J.Przybilla eupec GmbH D-59581 Warstei

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Pulse Generator with Diodes D2601NH company Phoenix Contact
C.Schneider, (Phoenix Contact), J.Przybilla eupec GmbH D-59581 Warstein, Germany Telephone number +2902 764-1762 number -1610 Carsten.Schneider@eupec.com
Introduction market pulse power applications present mainly dominated defence technology. Besides, there increasingly industrial applications. Strong endeavours exist replace mainly used switches like spark gap, Ignitrons Thyratrons with semiconductor switches. Among others, availability diodes with high blocking voltage high reverse recovery characteristics property required. Application company Phoenix Contact developed pulse generator which used test surge current with lightning protection components (resistive behaviour). simplified design pulse power installation shown illustration charging voltage capacitor amounts area lightning protection facilities, there different tests. They marked 8/20 10/350 pulses. waveform surge currents shown illustrations 8/20 pulse defined with rising edge 8µs. During this time, current amplitude rises from 90%. fades away within 20µs amplitude value. With this pulse variation, maximum amplitude pulse generator presently amounts 80kA present; increase ~100 planned. Thus results current gradient diF/dt 10kA/µs while increasing current gradient -di/dt 4kA/µs while decreasing. so-called 10/350 pulse rising edge rate 24µs Phoenix contact system. maximum amplitude 10/350 pulse amounts 68kA. Within 1ms, current fades away with relatively time constant amplitude value. Because relatively smooth fading away current, normal rectifier diodes into crowbar circle. order keep number diodes connected series possible, eupec suggested diodes with blocking voltage, D2601N90T.
blocking diodes firmly turned with attempt recharge capacitor i.e. with high commutation rate against high voltage. same time, reverse current diodes tear off. Through improvement turn-off behaviour rectifier diodes, eupec presenting most effective diode D2601NH90T.
Charge diodes During start-up installation, measurements voltage were performed blocking diodes order appraise charge diodes. fixed that crowbar works freewheeling diode with both pulse forms. parasitic inductance circle, capacitor recharges. Through recharge attempts, blocking diodes firmly switch with high di/dt against high voltage. voltage variation shown illustrations overshoot voltage turn-off blocking diodes (illustrations caused off-state current gradient reverse current diodes inductance circle. Technology diodes order avoid high voltage overshoots blocking diodes, diodes with higher softnessfactor required. I.e., even within high dynamic charge, reverse current must softly subside. reverse recovery behaviour diode D2601NH90T shown illustration comparison, reverse recovery behaviour Crowbar diode D2601N90T under same measurement conditions shown illustration steeper decay current after reaching peak reverse recovery current clearly recognized. Additionally, bigger generated voltage overshoot Crowbar diodes relation blocking diodes seen. high softness factor blocking diodes D2601NH90T reached implantation. forward voltage does essentially increase itself, though surge current remains stable. Crowbar diodes normal rectifier diodes. blocking voltage diameter diode pellets 76mm important efficient construction with simultaneous minimisation parasitic effects pulse generator. requires parallel circuits 100kA/30kV limits number switching diodes connected series Therefore, only blocking diodes serial connection needed.
Blocking Diodes 3xD2601NH90T
Crow Diodes 4xD2601N90T
Illustration Simple design pulse generator
Illustration 8/20 pulse (10µs/div. 10kA/div.)
Illustration 10/350 pulse increasing slope
(10µs/div. 10kA/div.)
Illustration 10/350 pulse
(200µs/div. 10kA/div.)
Illustration measured back voltage (VR= 3457V)
decreased commutation blocking diodes 35kA, 8/20 Puls, (5µs/div. 1kV/div.)
Illustration measured back voltage 4094V)
decreased commutation blocking diodes 28,75kA ,10/350 Puls, (5µs/div. 1kV/div.)
Illustration Turn-off behaviour Crowbar diode D2601N90T
Ch1: Ch4: 100A/div. 1000V/div. 0,4MW/div.
Math1: Poff
Illustration Turn-off behaviour blocking diode D2601NH90T
Ch1: Ch4: 100A/div. 1000V/div. 0,4MW/div.
Math1: Poff

C.Schneider, (Phoenix Contact), J.Przybilla eupec GmbH D-59581 Warstei

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