Hi All,

I'm looking at possible solutions to try and multiplex a single H-Bridge circuit using TRIAC's. TRIAC's are completely new to me and and wondering if this solution would work for 16 different loads. The H-Bridge will not be used to power motors but more so to provide a pulse to an inductor. Potential problem I see is the inductive kickback from the inductor but if keep power on the TRIAC gate momentarily the kickback will safely discharge in the mosfet flyback diode. Looking for feedback on the idea?

Thanks,
KCHARROIS

 

Not worth trying - triacs are not high-frequency devices, they would fail to commutate.

 

Not worth trying - triacs are not high-frequency devices, they would fail to commutate.

The pulse would be 200us long every 100ms. Would that work?

Thanks,
KCHARROIS

 

To provide a bit more detail. Prior to turning the H-Bridge on, two selected TRIACS gates would be powered to turn them ON. Once the TRIACS are turned on I would then send a 100us pulse to the correct MOSFETS to turn the H-Bridge ON. Once the pulse is over, inductive kickback would go through MOSFET flyback and then TRIACS turned OFF.

 

The Triacs will turn "ON" only if there is a voltage across them. If the Bridge is not ON when triggering the Triacs, then all you will achive is sending a current pulse through the Triac gate.

 

two selected TRIACS gates would be powered to turn them ON

Could you describe this a little more?