Tool/software:
Hi,
I am interested in using the TIDA-010232 reference design for insulation resistance monitoring in electric vehicles. The system I am working on includes an HV battery, auxiliary inverter, traction inverter, and an isolated DC-DC converter. Among these, only the DC-DC converter is galvanically isolated with respect to the HV battery.
I understand that insulation monitoring devices (IMDs) are typically used in IT systems (ungrounded systems). I would like to confirm if this reference design can effectively detect ground faults in the traction motor (connected to the output of the traction inverter) and the loads on the auxiliary inverter.
Additionally, I am aware of commercially available IMD devices that inject a low-frequency square wave, which is superimposed on the DC bus(Example Bender ISO175). Are there any significant limitations of the TIDA-010232 reference design apart from the following considerations?
- It cannot measure insulation when the DC bus voltage is close to zero.
- If the system exhibits high HV-to-ground capacitance, the measurement process may take longer, and insufficient time allowance could lead to erroneous results.
I appreciate your insights on these points and any further guidance you can provide regarding the suitability of this design for my application.
Thank you for your assistance.
Best Regards,
Raju Baddipadige
