Solutions
eMobility – inverter testing

The inverter is responsible for converting direct current (DC) to alternating current (AC). It is most often used in electric cars where the battery is DC and the motor is often AC. It is also used in photovoltaic installations and is used to generate alternating current.

In order to perform the tests, the following are required:

  • A power supply for HVDC simulating a car battery
  • Active or passive load simulating the electric motor in the car
  • Interfaces simulating diagnostic data from the electric motor (speed, temperature, status, etc.)
  • Data acquisition system (DAQ)
  • Power analyzer
  • Hi-Pot and insulation resistance tester
  • CAN interface
  • Higher power inverters require a cooling system (e.g., water)

The most common thing to do when testing an inverter is:

  • HVIL test
  • HVDC calibration
  • IGBT calibration for different operating points (loads, temperatures)
  • Test under full load – maximum output load on AC motor
  • Safety tests (HVDC circuit discharge, Hi-Pot test and insulation resistance measurement)
  • Communication, calibration and programming over CAN bus

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