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I guess it depends on the requirements of the load that is served by the DC supply. In your case though since your whole circuit is precharge you'd have to do the opposite.insert a contactor to bypass the resistor on startup. Since the precharge is essentially startup use only a contactor opens at the end of precharge. In a drive they just put a resistor in series. At startup the capacitor appears as a huge short circuit and can easily burn up your rectifier. This is the formula usually used for capacitor sizing.Īlso be aware that these are frequently used as precharge circuits for large drive systems. Vp is the peak AC voltage, RMS x 1.009 for a six pulse rectifierĬ is capacitance in Farads (18,000 / 1,000,000) Second you are missing voltage ripple in your calculations. Lots of calculus but they give the solved equations so you can safely ignore the calculus equations.
#TRANSFORMER BRIDGE RECTIFIER CALCULATOR PDF#
The following PDF contains everything you are looking fir: Is my math correct to derive my peak DC voltage, using the 1.65 multiplication factor for bridge rectified 3-phase voltage? Nominal DC voltage should be close to peak, with adequate filtering, yes? The servos have a 90VDC max rating, so I have plenty of headroom. With filtering caps, I should have a fairly solid DC supply.
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I will rectify the outputs of the transformers, and if my math is right, I should get 42V x 1.65 = ~70VDC. The transformers are rated at 234VAC primary, 48VAC secondary if I feed this power supply from 208VAC, that should give me a ~42VAC secondary voltage. (3) 1kva 48VAC secondary transformers wired together with a delta secondary (fed from a 208VAC 3-phase source) I'm looking at building a DC supply using: They require 75VDC, but with the number of servos I'm looking to run, the factory-supplied power supplies will consume too much room in the control cabinet, and be too heavy. I'm looking to design a nominal 70VDC power supply for a large number of servos. My transformer and rectifier math for 3-phase supply is a bit rusty. I posted this question over at, and didn't really get a good answer so I'm asking here: