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This one took a lot of me. Been designing it for days. It's loosely based on UC3846 current mode controller, with an inner current loop, and an outer voltage loop. Now, because the output doesn't have an inductor, the output response is solely based on the load and capacitor. Since the capacitance is large, it does define a lower frequency of response which was used to tweak the voltage feedback compensation, but because the output must work with any load (no load up to 1.5kW), the voltage feedback needed to be somewhat sluggish. For this reason, abrupt load changes tend to cause the output to overshoot or sag of about ±10V beyond the nominal value, but given that I'm designing this to drive an EGS002 1.5kW inverter, such voltage variations are not very relevant, as long as it stays within a given range.
Note: you can skip on the long charging of the output by shortly flicking the switch on the 397V power supply.
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