sixpack module gate voltage and junction temperature measurement

sayed

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HI ,

i am using CCB021M12FM3 six pack module to design inverter with PMSM load as you can see in the attachment. i have some question on its results.

1 it shows gate voltage of around 0-700V when i have given a voltage of around -4-16V. why its shows 700v in the circuit

2. the junction temperature of the circuit is also very high and it is in KV , why the temperature reading is in Volts . how to get this voltage reading in Kelvin or Celsius.

3 why the input current to the inverter shows negative

inverter withsixpack.jpg

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Forum_Moderator

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CFlack

sayed,

As a general note, you may find the ⁠Wolfspeed Power Module SPICE Models User Guide useful as you further develop your model.

1. The high-side gate and source voltage will shift relative to the voltage applied to phase. As such, gate voltages should be measured from the gate pin to the kelvin pin instead of the gate pin to ground.
2. Yes, the indicated junction temperature is elevated. This is likely from the high currents seen at startup (which appear to be even higher before 20ms). As the converter reaches steady state, the temperature of q4 approaches that of the other switch positions.
3. Current for each phase should vary from positive to negative in a sinusoidal manner. You may find section 5.3.2 from ⁠CRD25DA12N-FMC 25 kW Three-Phase Inverter as a good reference for waveforms.

Best,

Calvin

TBhatia

Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.