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Hello guys, I have a problem with my external hard drive. I connected it to my windows 7 laptop using an IDE to USB cable. I cannot open the folder. Anyway, more info can be requested from me but what I did is I typed "chkdsk H: /R /F" in the search for programs bar after clicking Start and then...
Thank you very much! I would just like to clarify that the e^-std term is to be multiplied with the overall outer loop gain and not just in the inner current loop? In other words, I can just multiply it with the equation in page 26 of the pdf of the loop gain? I would also like to clarify if the...
Umm, well yes the paper takes into consideration the ESR of the output capacitor in the design like in page 28 where he based some of the values of the resistor and capacitor of the Type II compensator on the location of the ESR of the boost output capacitor. My question really is in the form of...
Hello everyone, I've read this paper: https://u.dianyuan.com/bbs/u/39/1143802025.pdf about designing stable control loops for fixed frequency current mode controlled converters. In the pdf, at page 26 we see an approximate formula for the loop gain of a boost converter in fixed frequency current...
Ahh sorry, I forgot to mention. The yellow waveform is not entirely the mosfet current multiplied by sense resistor. My sense resistor is at 5 milli Ohms so I amplified it with Op-Amp X2 as shown in the figure. Comparator X1 implements the duty cycle clamping. Comparator X3 implements the...
Hello everyone, I seem to have a problem with my fixed off-time current-mode boost converter. The problem is it cannot regulate at its level of 46V with 50kHz switching frequency at max duty cycle operation. I tried to trace the problem and it seemed like it is noise/spikes which causes the duty...
When you have a 1/s term in your transfer function, it is clearly a pole at the origin. However, how can you put it in your bode plot when you have a frequency scale of powers of 10. You can put this pole in your bode diagram at location frequency f=1 at 0 dB. Below 1, the value 1/s is...
Hi all, I am trying to make a 45V boost converter with a max output of 90W. My input range is from 11V to 19V. I already have the hardware implementation of the whole converter and have tested it. I have here some waveforms of inductor current (blue) together with Vds of mosfet switch (yellow)...
Would changing the gate drive affect the switching loss significantly? I think the formulas given in the previous posts focused more on the drain-source capacitance of the mosfet but not the gate capacitance. If for example I have a 4.7 ohm resistor in series with the gate of my mosfet (I've...
Hello, can I ask something related to this? I also have this problem of calculating the switching loss of my MOSFET. From what is answered in this post, it may be represented by two formulas. One involving the rise times and fall times and one involving the Coss of the mosfet. Should...
Awww. Well I still have a lot of time and I plan to test my openloop boost first starting with a low input voltage and low duty cycle (signal generator + pushupull/totempole as gate driver) to see if there are any spikes and slowly rise the input and/or duty cycle and check for spikes. That way...
Hello,
I have a boost converter which I am still fabricating and I want to test its openloop characteristics first. I am afraid of this because my specs is: Input (11V-19V) and Output is 45V and the MOSFET I am using has a Vdss of 55V (IRFZ34N). I am afraid of possible voltage spikes across the...
Hello everyone,
I am interested in determining the maximum magnetic flux that is entering my core in its steady-state operation. It seems that for the calculation, I need the permeability of my core. The problem that I have is that I am not so sure of what the permeability data in datasheets...
Well, my MOSFET gets approximately 10A during turn-ON in which it has Vds approximately 0.065V and when it is OFF it gets 0A with voltage across it approximately 45V. I see, thanks guys. I was just wondering about the 170W rating of the MOSFET. It only says 170W at 25 degrees celsius but I am...
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