I am looking for recommendations on how i would implement a circuit to drive a mosfet that will pass 230V+/- AC. I was thinking of using a gate drive transformer but i am unsure on how to approach this since the source of the FET is not a DC voltage but the +/-230V. It's a relay with a MOSFET plus the gate drive circuit. Any and all ideas will be appreciated.

  • \$\begingroup\$ As single MOSFET cannot switch 230 VAC, you need back to back MOSFETs. \$\endgroup\$ – EE_socal Mar 7 '18 at 23:23
  • \$\begingroup\$ If it is AC with substantial current you will need both P-channel and N-channel MOSFET modules driven by a PWM supply, acting as a isolated switch. Or you can use a bridge rectifier and a N-channel MOSFET, with a PWM isolated switch \$\endgroup\$ – user105652 Mar 7 '18 at 23:39
  • \$\begingroup\$ Is this a switch or a PWM or phase control? If it's an on/off switch you can't use a simple gate drive transformer as you can't keep the FET on with 100% duty cycle. You could look at the optically coupled photovoltaic gate drivers if you don't need super fast switching? \$\endgroup\$ – John D Mar 7 '18 at 23:54
  • 1
    \$\begingroup\$ You want to use a set of SCRs or a TRIAC and drive them from a opto-triac. Search STmicro for datasheets and application based on expected load \$\endgroup\$ – DIODEX Mar 8 '18 at 5:20

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.