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Juglenaut said:simply put a diode across the inductive load matching it polarity.
Styx said:Try improving the layout of the power components - you are usingf decent busbars for the DC-link arn't you?
Next have a play around with the gate-drive. If you can slow it down a bit (at turn-off) you will ok increase the switching losses of the thyristor but you will help it. - do not slow it down loads it still needs to be as fast as possible, just take the edge off it
with an improved power layout and a slightly slower turn-off then start looking at a RCD snubber circuit.
Styx said:Why is he using a TRIAC in an AC system then - it will not turn off?
Juglenaut said:Looks like you got the op amps set up for open loop gain, so any stray voltages will be amplified alot.
Styx said:true BUT what he doesnt say is what the load current is. The thing aboyut TRIAC's and THYRISTORS is there needs to be a significant period of no current flowing for them to stop ocnducting - I just dont think the zero-cossing in itself is long enough for minority cariier decay thats all
Styx said:true BUT what he doesnt say is what the load current is. The thing aboyut TRIAC's and THYRISTORS is there needs to be a significant period of no current flowing for them to stop ocnducting - I just dont think the zero-cossing in itself is long enough for minority cariier decay thats all
Nigel Goodwin said:Styx said:true BUT what he doesnt say is what the load current is. The thing aboyut TRIAC's and THYRISTORS is there needs to be a significant period of no current flowing for them to stop ocnducting - I just dont think the zero-cossing in itself is long enough for minority cariier decay thats all
That's how they work!, the load current doesn't really affect it.