CRD200DA12E Startup

djsubert

Wolfspeed forum,

I am looking for tips/tricks on working with the previous generation CRD200DA12E. We utilize the CRD200DA12E to create a 3ph sin wave to test a set of current sensors (one for each phase). The DC link is 45VDC & we are utilizing 0.8ohm resistive loads. To interface with the gate drivers generate the sin wave, we created a circuit board with RS485 transmitters and an Arduino. Our base switching frequency is 20khz. Cooling is handled by a stand-alone WEG chiller from one of our test cells.

With this configuration, we are able to successfully generate a clean 3ph sin wave for several minutes at several current levels. After a few minutes, the sin wave becomes distorted. We observe DC offsets & sharp peaks in the 3ph current waveforms.

For troubleshooting, we have looked at the usual suspects without positive results:

1. Fault pins from the gate drive boards
2. Noise impacting the gate drive board control signals
3. Tried multiple sin wave frequencies & carrier frequencies
4. (Investigating now)….double checking our 3ph arduino code is consistently generating the sin wave over time, not just at the 20khz carrier, but at the frequency of the sin wave.

Any suggestions or advice would be appreciated. Especially if there are fundamental issues with our goals/application of the CRD200DA12E.

Thanks!

David Subert

Forum_Moderator

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