SpeedFit™ Design Simulator
Simulate and evaluate the performance of SiC-based power circuits and determine the right SiC device in seconds.
Start a SimulationA question about the heat sink in the reference design CRD-06600FF065N-K
I was using the CRD-06600FF065N-K PCB file for the design and found that the CLLC converter was in the overresonant state with a lot of electromagnetic radiation, which had interfered with the current sampling. I found that there is a high-frequency current oscillation when the switch is operated through the current transformer, but there is no abnormality in the voltage at the midpoint of the bridge arm. I didn't use a fully enclosed radiator for heat dissipation, I don't know if that's the reason?
Comments
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Thank you for your post, it has been approved and we will respond as soon as possible.
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Hi Jing,
Could you please check the Vgs and Vds of the MOSFETs at the primary side? high-frequency current oscillation happens at the turn-off. we would like to have a look at the Vgs and Vds at that moment. thank you
Regards,
Frank
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Okay, in the figure below, the green line is the primary downtube Vgs waveform, the red line is the primary downtube Vds waveform, the blue line is the secondary downtube Vgs waveform (which is invert), and the yellow line is the secondary current transformer waveform. The differences between the four graphs are the switching frequency and sampling interval.
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