dynamag
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Hi
I am trying to design a dc dc converter with a push pull setup from 12vdc to 340vdc of 1000watts. The frequency of operation is 50khz. For trial and test purposes, I have hand wound - quite tightly - a push pull transformer on an ETD44 bobbin, with a foil of 25mm x 0.05mm x 4 turns with center tap as the primary, and 19SWG(about 18AWG) x 136 turns with center tap as secondary. With a tiny load on the secondary, I get a severe resonating signal - and spike - on the drain when the MOSFETs are switched OFF. I have included the waveforms and circuit for better understanding of my issue. You can also see the two waveforms are not the same, so that is another issue I need to solve
The probes are X10 probes, so the values shown on the scope display are correct.
What should I do so I get similar, clean square waveforms, with no resonance or spikes for current loads ranging from 1 to 80 amps, for both sides, with no differences.
I am trying to design a dc dc converter with a push pull setup from 12vdc to 340vdc of 1000watts. The frequency of operation is 50khz. For trial and test purposes, I have hand wound - quite tightly - a push pull transformer on an ETD44 bobbin, with a foil of 25mm x 0.05mm x 4 turns with center tap as the primary, and 19SWG(about 18AWG) x 136 turns with center tap as secondary. With a tiny load on the secondary, I get a severe resonating signal - and spike - on the drain when the MOSFETs are switched OFF. I have included the waveforms and circuit for better understanding of my issue. You can also see the two waveforms are not the same, so that is another issue I need to solve
The probes are X10 probes, so the values shown on the scope display are correct.
What should I do so I get similar, clean square waveforms, with no resonance or spikes for current loads ranging from 1 to 80 amps, for both sides, with no differences.
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