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SCR Based Pulse Switch Turn Off Problem?

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LAN_403

Steve Conner

Wed Nov 18 2009, 08:33PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Why don't you just disable the power supply momentarily to let the SCR recover? Switchmode power supplies usually have a remote on/off input of some kind. If the SMPS was designed for capacitor charging, it should work out.

There is a forced commutation circuit developed for coilguns, called the V-Switch.

SCRs don't need reverse voltage to reset. When the current through a SCR drops below the holding current, after a certain time delay it will turn off, and any forward or reverse voltage appearing across it is a result of the turnoff, not the cause of it.

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