Boost converter capacitance
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Thomas
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Registered Member #120
Joined: Fri Feb 10 2006, 07:07AM
Location: Westchester New York
Posts: 83
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Excellent, I'm now running at a lower frequency. I am now driving it at 3.5kHz, it runs much faster. Now full charge time takes around 3min. to reach 400V. The duty is around 80% positive. I'm still using the same inductor value. However, I now added a 2k resistor from the drain to ground. Note my inductor connects to the drain as well, not the grounded side. It did make a significant improvement, but while charging it does seem to take up some time.
Now I've noticed one problem. On my capacitor bank I have a reverse bias diode to prevent the capacitor voltage from dropping bellow 0V, but the diodes here keep exploding or dying. My 400V 35A diode died and a 1kV 3A diode exploded. I'm not sure why this happening, but the 3A diode exploded while charging. I'm not sure when the 30A diode died, but it became noticeable during charging when my boost converter couldn't get the voltage above 183.2V. Should I look for a diode that's rated at 600V and a couple of more amps since they're expensive and I'd like to have it there in the circuit.
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