Considering a minimum textbook example might be a sign of "needs a bit of experience" before you want to build things that will potentially electrocute you. 300V can and will kill you and the ones you love. That's much cleverer than just calculating things and hoping for the best in terms of component tolerances and parasitic effects (which will absolutely ruin your day here).Īctually, I'd recommend not building something like this yourself. If you want a power supply, there's ICs for that, which take all the burden of actually building something that works from your shoulder: In practice, a switch-mode converter would measure its output, and adjust its duty cycle automatically to achieve the desired output. I have a duty cycle of around 1% since the output voltage is tiny in comparison to the input.Įxactly, and because this circuit was meant to illustrate the principle, not to work at edge conditions, it will work miserably, if at all.ĭon't do that: copy circuits from random websites which try to teach you basics. I calculated the inductance at around 26uH, and capacitance to be a minimum of around 50uf, However I'm using 100uF on both the input and output capacitors. No one in their right mind would recommend building something like this! That's because it's a very textbook example, seemingly taken out of context. Also, you'll need a > 300V breakdown bijunction transistor, and that's going to be unnecessarily expensive, and probably waste a lot of power, thus will be very rapidly changing in characteristics due to heating up, thus making everything worse.Īlso: at 1% duty cycle it is very hard to maintain stability of anything. The time you'll spend in such an open-loop configuration to actually make things stabilize at the voltage you want will be quite substantial, and the slightest change in temperature will change how the transistor works, so: don't try this. What I wanted to ask, is such a circuit feasible? Practically not theoretically.
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