RandomElectrons
Junior Member level 3
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- May 25, 2019
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Good day to yall and pleasure to join up after reading up on here for a year!
Might as well break in with a general guidance request and go from there. My attempts to design a 400VA adjustable DCDC SMPS has been very troublesome. Two versions have been made but are either unstable or < 75% efficient and heavy. Summery: 25VDC in ( to isolated) 50VDC to 1KV adjustable. 400 watts across the range.
Both attempts are push pull. The 1st using 50KHZ and output multipliers results in instability and high loses in the bridge multiplier and front fets due to high current pulses to regulate between output stages. The 2nd takes the 400hz approach. Stable, but huge I^2R Xformer loses and heavy Xformer and caps.
Oh, I definitely have a more to learn in order to fine tune this, but it seems like a good start is to revisit the basic topology choice again. Any guidance will be heavily considered with a much thanks in advance!
Might as well break in with a general guidance request and go from there. My attempts to design a 400VA adjustable DCDC SMPS has been very troublesome. Two versions have been made but are either unstable or < 75% efficient and heavy. Summery: 25VDC in ( to isolated) 50VDC to 1KV adjustable. 400 watts across the range.
Both attempts are push pull. The 1st using 50KHZ and output multipliers results in instability and high loses in the bridge multiplier and front fets due to high current pulses to regulate between output stages. The 2nd takes the 400hz approach. Stable, but huge I^2R Xformer loses and heavy Xformer and caps.
Oh, I definitely have a more to learn in order to fine tune this, but it seems like a good start is to revisit the basic topology choice again. Any guidance will be heavily considered with a much thanks in advance!