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SMPS topology selection

This may be repeated posting... I need to recharge a capacitor (strobe-like application). Once capacitor voltage reaches ~230V the converter turns off (open loop operation). Input voltage 10V. Target Vout =230V. Cout=100uF (not that it is very important). The converter needs to "replenish" ~0.6J in 4ms. In other words recharge 100uF capacitor from ~200V to 230V in 4ms (or less). It means 150W. The power requirement may be increased to 250W or more (or so I was hinted). The prototype uses flyback topology and it is only 50% efficient. I can see where I can get another 10% (15% if I am lucky). I forgot to mention that it is for hand held battery powered device - efficiency and size are important. Small details.... What is the chance of getting better efficiency out of, say, push- pull converter? Thanks!

Reply to
Michael
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The efficiency is low probably due to the improper magnetics and too high operating frequency.

If you only have to recharge the output capacitor from 200 to 230V, you can use the unregulated push-pull topology without buck inductor. The stray inductance of the transformer could be enough. The advantage is the better utilization of magnetic components.

You can take the different approach: continuous slow charging of the high voltage storage capacitor, and fast recharging of the flash capacitor from that storage.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

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Reply to
Vladimir Vassilevsky

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