Hello,
I am currently in the process of designing a 2kW generator.
However, I seem to be running into a couple of problems regarding ringing and MOSFETs blowing up.
For the spec of the design... It is running off an alternator. Depending on the spped of the alternator (depending on how much load is on the generator), the input voltage will range from 30V to 130V. I have no idea about these figures, as I was told that is what they would be.
I also got told to make the PIC run at 100kHz, as this will reduce the size of the transformer needed to step the 30V to 130V up to 375V.
The problem I am having is that there is ringing on all the lines that I am measuring throughout the circuit. I have attached a couple of screenshots from the scope when I was measuring it. I was measuring across the 3Ω Load. I am using this resistive load until I can get it working on a high voltage, then I will switch to the transformer.
Also, I blew up one side of the bridge at 100kHz, 36V. (Having to use batteries due to current limiting PSU). So I halved the frequency, just to get it working, and the ringing seemed to have decreased.
Long post, but just a question of... Am I doing this right? Are there any obvious mistakes I am making? And finally, with the slight ringing that is currently there, how do I get rid of it? Or is it acceptable?
Thanks for your time to read this post,
Techy
I am currently in the process of designing a 2kW generator.
However, I seem to be running into a couple of problems regarding ringing and MOSFETs blowing up.
For the spec of the design... It is running off an alternator. Depending on the spped of the alternator (depending on how much load is on the generator), the input voltage will range from 30V to 130V. I have no idea about these figures, as I was told that is what they would be.
I also got told to make the PIC run at 100kHz, as this will reduce the size of the transformer needed to step the 30V to 130V up to 375V.
The problem I am having is that there is ringing on all the lines that I am measuring throughout the circuit. I have attached a couple of screenshots from the scope when I was measuring it. I was measuring across the 3Ω Load. I am using this resistive load until I can get it working on a high voltage, then I will switch to the transformer.
Also, I blew up one side of the bridge at 100kHz, 36V. (Having to use batteries due to current limiting PSU). So I halved the frequency, just to get it working, and the ringing seemed to have decreased.
Long post, but just a question of... Am I doing this right? Are there any obvious mistakes I am making? And finally, with the slight ringing that is currently there, how do I get rid of it? Or is it acceptable?
Thanks for your time to read this post,
Techy
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