Sir ur excellent work , Any One person who relate this job,when he play ur video.he can't stop or skip any part of ur video,thank u for this informative,and good video.
Excellent video. I was to put a request for a series of video where we can get to know designing a power supply of our own. So I'm really very excited for your upcoming videos with on this topic. Thank you very much for your help and support. Please keep it up.,
Assalam o alaikum. I find it very interesting. Could you tell me how many parts of this SMPS Design are there, as they are not in sequence I think. Kindly mention video numbers related to these
Hi sir In bulk capacitor calculation, if we reverse calculate with 68uF capacitor value the ripple voltage will come as 60V. Is the voltage value taken shoul be Vpeak - Vdc min hole squre??
Thanks for your informative video. I have one question. According to your Bulk capacitor value calculation required value is very high. Normally we found very less capacitance value in practical circuit. As example it is seen for 48W output power, input capacitor value is 47uF, or 68uF. For 65W power supply, it is generally max 100uF. Can you please share what's happened there?
I think the step by step approach is to establish the required capacitor value and it's WVDC rating, although for selection ripple is also very important. For ripple at 100Hz one design goal is to minimize the heat generated within the bulk capacitor due to internal ESR (which depends on which capacitor you choose, from what manufacturer and how it is constructed, you cannot just go by the value calculated). So there is a tradeoff between the capacitor size and its ripple rating or depth (with some added margin because this capacitor has one of the highest failure rates in the design). The choice of 15% ripple for off line is interesting because it was given as a rule of thumb although what is acceptable is the overall design of the capacitor itself. Also, given as a rule of thumb, was an overall power efficiency of 80% (which is reasonable). If you have a thermal camera and examine different capacitors (of the same value and voltage rating but different vendors and types) in operation you can immediately see the heating effect of ripple. You can just simulated the load (converter) with a resistor. Some, input capacitors will get very hot (above 80 C) other will run a lot cooler depending on ESR. This is why the recommendation was for a 105C capacitor and not an 85C rated capacitor the author wanted some margin. But, in actuality, the capacitor you choose at a given worse case supply power should run as cool as possible in order to maximize it's life (temperature versus MTBF). So, what you will find, if reliability is a factor, the capacitor value will be very large in comparison to the calculation. Also, the WVDC rating of 400V assumes to a certain extent that any fast AC line transients beyond the surge voltage rating of the capacitor is minimized on the AC side using a MOV. So, in a way the design is assuming the rating of the capacitor will not be exceeded. And, it was also mentioned that the capacitor would have a current surge (supply surge limiter) using a NTC Thermistor. Which minimizes the surge current into the capacitor.
Hi Sir, I hope you can mention along the way how to vary the output current in design from say 5Vdc at 2 Amp to the 5 Vdc at 3 Amp. Which components require the replacement, etc for that purpose. TQ, you simply the best
Thank you very much, can you give the some idea about distributed capacitance in transformer at high frequency and high KV secondary,how to reduce also please give some idea. in transformer design i am selecting the core by Area product method, in that i am fixing the J value initially by 200 amp/cm2, then i choose the core is it correct method of i am going please confirm it. Thank you.
Can we use the over value for the capacitor rather than the calculated value .... I mean calculated joule increase up to more than 50%. My expectation is capacitor life & life expand. Is it correct
Kaya 24v 5 amp SMPS ko 36 volt me convert kar sakte ha reference voltage me changes karke aur output ke capcitor ki working voltage Wale lagha kecircuit me
6:08 - Setting the frequency to 200 kHz instead of lower will minimize rise time, as you said. But, since the higher the frequency will be the shorter the rise time will be, what would be the drawback if you wanted the frequency to be as high as 500 kHz? Where would you draw the cutoff line?
Sir, upto how much range of power, we can use smps flyback topology, if we need more power, which topology we can use. and i am eagerly waiting for part 3.
Hi, there us a formula from TI for a 12v 4Am SMPS Cin= 2×Pin ×(0.25+1/pi ×ArcSin(Vbulk(min)/√² ×Vin(min))) / (2×Vin(min)² - Vbulk(min)²)× fline(min) Where : VIN Input Voltage 85 --115/230 -- 265 VRMS fLINE Line Frequency 47 --50/60 -- 63 Hz VOUT Output Voltage IOUT(min) ≤ IOUT ≤ IOUT(max) 11.75 -- 12 --12.25 V VRIPPLE Output Ripple Voltage IOUT(min) ≤ IOUT ≤ IOUT(max) 100 mVpp IOUT Output Current 0 -- 4 A η Efficiency 85% My approach is: First, the denominator: 2×Vin(min)² - Vbulk(min)² × fline(min) (2 × 85² - 75² ) × 47 = 414775 Second, the numerator: 2 × Pin ×(0.25+ 1/pi × ArcSin(Vbulk(min)/√2 ×Vin(min))) 2 × Pin ×(0.25+ 1/pi × ArcSin(75/ √2×85)) 2 × Pin ×(0.25+ 1/pi × ArcSin(75/ 120.208)) 2 × Pin ×(0.25+ 1/pi × ArcSin(0.6239)) 2 ×Pin ×(0.25+ 1/pi × 38.6029) 2 ×Pin ×(12.5377) But at the end the power is very huge. That is: 126 = 2× Pin × 12.5377 / 414775 Pin = 2084183 watt My questions are: 1. Is the calculation on denominator correct? 2. Is the calculation on numerator is correct? 3. If correct, is power in that huge?
Good day from Venezuela south America. I am engineer in electronics . I am interested on this video to design SMPS power supply . I suggest to you if may I say : what don't you use a magic black board to do this tutorial about designing this power supply . I can not see what yiu write on the paper . It is difficult to get all the information from the paper you are using . The numbers and letters are to small .
Mr haseeb in current mode smps like welding inverters and all high current mode parellal bulk caps are used what is the purpose of that parellal caps why not to use one cap with large capacity My regards.
I am having a problem with my mobile charger. Its output is stable 5V at no load but as soon i connect it to my mobile this voltage fluctuates betweeb 5V and 0V. It seems it is turning on and off. What could be the problem?.
