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'''CDI requires an appr. 400V DC supply''' We want to be safe, so 100W power should be targetted (0.25A output current). Input is 14V as usual. I was thinking about CDI supplies. I built a transformer based supply earlier (somewhat lower wattage). The best I can come up with is a simple '''flyback design'''. This has the lower part-count, beautiful simplicity (including testing!) If power was >300W a transformer based might become more attractive. We need to use many thruhole parts in any case. Flyback design consist of only 4 major parts: * inductor * switcher * diode * output capacitor ---- '''Inductor''' - (note: not transformer) For experiments we can use 4 of these in parallel: * 47 uHy 1.5A 0.14R 10% RAD * (BOU) RLB0914-470K 9.5 The same barrel type/size as the 1.5uH 5.4 A we use on v3.x. Finally we'll wind our own toroid or whatever type. (12V / 12uH) < (16A / 16usec) 16A peak is a bit high (for the IGBT too, and definitely for the diode). 16A peak means about 16A / 2 * 12V=100W. ---- '''IGBT''' similar to what we have now, but to make 400V possible, clamping at 370V is not desired. FETdriver is needed to drive the gate at 64 usec (15625 Hz). ---- '''Diode''' To get 10A diode from 5 pieces of 2 A diodes is slightly more complex than simple parallel connection because of the -2mV/K temperature coefficient, the one with lowest voltage will overheat itself. Series resistors (for each diode, maybe trace is enough) can fix that. * BY399 (3A continuous, 600V) dropped (thruhole not justified) * '''SMB''' footprint fast ES2J that we use all over the place is '''perfect''' Maybe 6..7 SMB in parallel and 0.022 Ohm in series with each. ---- '''Caps''' Electrolitic cap is not the best idea at 16 usec period. It might even explode. Some testing is needed in any case. Other cap that might work: * 2uF 450V 10% . MOTOR MP60020061 (DNA) 25x52mm M (1.4 Euro) 0.25 A * 16 usec = 4uC 4uC / 2uF = 2V (ripple) ----
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