Recent content by res_smps

i don't know if this ncp1396 worksheet can be used for ncp1395

Dear Silvio, yes, that also true. Thank you for the file, I also previously shared it here (zip files) in post #2 please ignore the picture in post #41, there was an error cbulk value is determined from the highest results from the following 2 formulas : 1)...

I think I have to correct this statement I thought the PFC frequency determined the size of the capacitor, I was wrong from the worksheet, capacitor requirements are not determined by the PFC frequency, please check this formula (pic) below *for the same power, the higher the output voltage...

another mistake? maybe the error is only in the schematic, i hope the pcb is correct

I measured the inductance of this Sanken transformer which turned out to be quite small, I have never used it so I cannot comment further Lp : 152.8uH aux 9.68uH Ls (out) : 15.89uH I also found some mistakes

from what I observed most audio pro use igbt and igbt is suitable for zcs, works under resonant frequency. and i don't know why they choose zcs over zvs Now LLC seems to be more popular on TV sets, using mosfets that are suitable for ZVS and LLC can also be used for step-ups, in this appnote...

hi, there are 4 common types of resonant converters 1. SRC: used by most pro-audio, using IGBT working on ZCS (for example crown xti series), unregulated 2. PRC 3. LLC: widely used today for LCD / LED TV, regulated 4. LCC: from theory suitable for step up (Vo> Vin) for the calculation of the...

Dear Silvio, First I clarify my statement above that I do not need (interested) the PFC applies to me personally, not in general. from what I understand, reactive power only circulating in system, in one cycle at a short time a large current is needed to charge the capacitor and supply the...

Thank you Microsim, I measure the voltage at resonant capacitor using voltage divider (1M and 10K if I remember correctly) then connect to my oscilloscope because my oscilloscope is only 80Vpp max next time I'll do it for you

Dear silvio, yes, i've seen the video unfortunately I am bad at mechanical design and the cost of construction using a CNC machine is not cheap this is the progreess from this configuration we can use A-B : 100ohm 300W A-C or B-C : 50 Ohm 150W A||B(parallel)-C : 25 ohm 300W This dummy...

load test using a water heater load with 1 heaters Pin=401,6W Vout=138,4A Iout=2,62A Pout=362,608W Eff=90,29% load with 2 heaters Pin=818W Vout=138,5 Iout=5,43A Pout=752,055W Eff=91,94%

Dear Silvio. I used nickel wire for a long time, glowing red when it was hot, it burned my table several times yesterday I bought some 1000W 220V (around 400W when I tried to 140V smps) water heaters for EUR 1.28 each I measure this heater has a 1.1mH inductance and this is the rf...

Electronic Dummy load concept I have a plan like this: Using an electronic switch (Mosfet) to eliminate sparks M1,M2,M3 fully on when switched M4 as variable resistor depends on gate voltage

We know that there are several methods for testing SMPS. In this post I want to ask, has anyone ever used an RF dummy load power resistor? I can get this used resistor at a very cheap price (under 1 Euro each). I am thinking of paralleling and placing it on the CPU heatsink and installing the fan

Dear Rookiex, for the calculation of the fullbridge transformer you can refer to this http://tahmidmc.blogspot.com/2013/02/ferrite-transformer-turns-calculation_22.html the number of primary windings for fullbridge smps will be 2 times half bridge smps for calculation the PFC you can use this...