https://community.nxp.com/t5/Power-Management/Single-Phase-AC-Induction-Motor-Control-Reference-Design/m-p/1714061#M2904 <P>Hi to everybody,</P><P>I'm using the circuit suggest by the Motorola application note DRM039 (circuit of page 23); everything works fine but during the product certification I found that the 2KV surge disturb destroys the circuit!!&nbsp;</P><P>Transil diodes D11 and D18 aren't able to protect the IGBTs. Also a varistor S10K300 at the AC line input is not sufficient to stop the surge transient. I tried to use strong IGBTs (IXYH8N250CHV) without positive results. The load is a 45W fan motor.</P><P>Anybody use that circuit? Suggestions to solve my problem?</P><P>Thanks a lot.</P> Wed, 30 Aug 2023 14:03:53 GMT Lorenzo_Ziliotto 2023-08-30T14:03:53Z https://community.nxp.com/t5/Power-Management/Single-Phase-AC-Induction-Motor-Control-Reference-Design/m-p/1714061#M2904 <P>Hi to everybody,</P><P>I'm using the circuit suggest by the Motorola application note DRM039 (circuit of page 23); everything works fine but during the product certification I found that the 2KV surge disturb destroys the circuit!!&nbsp;</P><P>Transil diodes D11 and D18 aren't able to protect the IGBTs. Also a varistor S10K300 at the AC line input is not sufficient to stop the surge transient. I tried to use strong IGBTs (IXYH8N250CHV) without positive results. The load is a 45W fan motor.</P><P>Anybody use that circuit? Suggestions to solve my problem?</P><P>Thanks a lot.</P> Wed, 30 Aug 2023 14:03:53 GMT https://community.nxp.com/t5/Power-Management/Single-Phase-AC-Induction-Motor-Control-Reference-Design/m-p/1714061#M2904 Lorenzo_Ziliotto 2023-08-30T14:03:53Z