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How to enhance the protection of S12ZVM’s VLS_OUT pin ?

Question asked by Dusty Ko on Jun 19, 2016
Latest reply on Aug 11, 2016 by StanleyH

Hi All:


I am using a S12ZVMLEVBLIN EVM board to implement a automotive HVAC's motor control.

And, the MCU's firmware is base on MC9S12ZVML128_PMSM_Sensorless project.


I have a issue about I can't drive this HVAC motor to max. speed. (4000 RPM)

When I drive this motor to 3000 RPM, the EVM board is into Over Bus Voltage protection.


When I open the limited range of OVP to 40V and drive motor to 3200 RPM , the S12ZVM’s VLS_OUT is broken. ( Normal is 11V , it is 1V only now )

It seems there is a more than 35V high voltage in the DC Bus when I drive this motor to high speed.


May I have any recommend about how to adjust S12ZVMLEVBLIN EVM board’s OVP Circuit ?