mengghee
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mengghee said:Hi, I am currently designing a boost topology with a feedforward control, i am just wondering if anybody knows how i can calculate the efficiency and also how do i estimate the loss in the mosfet or what affects the efficiency. thank you very much
mengghee said:But I thought In a DC circuit. we shouldn't be bothered to much about RMS values... isn't that true ? thank you
1. About average value, u can calculate it according to Vmax and Vmin of steady-state sine,V(av)=Vmin+(Vmax-Vmin)/2=(Vmax+Vmin)/2. ur formula V(av)= (Vmax-Vmin)/2 is a peak to peak value,and it doesn't include DC voltage value. Actually,this is a single estimate method,but it can estimate ur efficiency.Thank you Huojinsi, but i am just wondering how we should obtain the average value ? should it be calculated like V(av)= (Vmax-Vmin)/2 ?? sorry a bit dumb. and do you know anything about the power loss ? like switching loss, conduction loss etc.
mengghee said:But I don't know how to simulate it using cadence, I am using PSpice to simulate it. I am just wondering if there is a formula or if you do have some links about it. thank you .
edwintsu said:1:`Calc efficiency. Do tran sweep by changing current load(using step-function signal), and then measure steady state v(rms), i(vin).
η=Po/Pin=v(rms)×i(load)/(v(vin)×i(vin))
2:`Power loss Reference.
B. Arbetter, R. Erickson and D. Maksimovic, “DC-DC Converter Design for Battery-Operated Systems,” 26th Annual IEEE Power Electronics Specialists Conference, Vol 1, 1995, pp.103–109.
J. Stratakos, “High-efficiency Low-Voltage DC-DC Conversion for Portable Applications,” UCB,Ph.D.Thesis,1998.
Hope it help u!
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