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Doubt about coil simulation

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Julio Sebastián Sullca Trillo
关闭： Sabin 2025-7-2
I have done a full bridge converter in simulink (from +330 to -300V). Everything goes well untill I did a proof with a coil. The voltage from converter was a perfect square and the current trough the coil was a perfect triangle (I attached picture). However when I scope the voltage from the coil the result is a triangle wave which goes from positive to negative supply voltage. The result must be a perfect square with that voltage. Current trough coil is correct I proved that. So I don't know why if current is perfect triangle coil voltage isn't squared. I think could be a problem with the solver or steps resolution. I hope you help me. Moreover I attached a picture from the coil connections. L=5mH.
  2 个评论
Théophane Dimier
Théophane Dimier 2020-12-8
What kind of switches are you using for your full bridge? Are you sure that the parasitics of the switches are correctly set (especially drain-source capacitance)?
Julio Sebastián Sullca Trillo
Julio Sebastián Sullca Trillo 2020-12-8
I'm using IGBT model from simulink. I attached a picture of the full bridge:
It is suposed that simulink model is ideal, so there aren´t parasites, isn't it?. Moreover I fixed diodes and IGBT as ideal switches, I attached another picture about the paremeters. I also eliminated snubbers.
The problem is if current trough coil is a perfect triangle, why is the voltage a triangle too? This is ilogical. Must be a squared.
I did another experiment. I disconected the coil from the full bridge and let it as an open circuit and found this two voltage waves. Up image is before bridge and down is after bridge.
As you see up image is correct (because I use a rectifier) but not the other one. The second picture must have a squared shape. If you think you can help me. I can send you my simulink model.
Thanks for your answer.

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