Hello Silvio
greetings managed to find the schematic of the pcb i ordered please can you check PWM section
is it correct
warm regards
Michelle
Hi Michelle, Do not be mislead the video in the first post shows a full bridge smps while you are building a half bridge smps. As I can see the pcb takes two kinds of transformer. It either takes an EE55 or an ETD49. The EE55 gives a little more power in fact I got 2KW in my prototype with EE55. ETD49 will give you around 1.5Kw. You must also consider the input voltage with the PFC will be always higher than the maximum AC input voltage.
Let us say that the maximum input voltage of the smps is 254vac then rectifying and smoothing will bring a voltage of around 360vdc. Usually we settle for a voltage of 380-400v. Please also consider your nominal input AC voltage at home and if it is on the lower side like 210vac or lower then it will be better to settle for around 370v or so. I am saying this because the PFC will have enough headroom to boost up the voltage when high load is present.
With all this in mind please let me know what transformer you are going to use and also the core material so that I can work out the number of turns for you. Please also let me know the output voltage wanted. I will also want to know the bobbin length and the window space so that I can calculate how the winding will fit in the transformer. The switching frequency will be adapted according to how things will fit and copper wire used. Please also tell me what switching transistors are you going to use as I have to put the saturation voltage or the RDS on in the software. I also want to know what output diodes for the output you are going to use. I am assuming that this smps is going to be used for audio amplifier.
Regarding the PCB I think all is well and as you start assembling things I will guide you step by step so that you will not blow anything up.
Yes I am on facebook and also watsup. send my an email on
silviodeleo@gmail.com and I
give you details.
Here is the link for the HB smps you are building
https://www.youtube.com/watch?v=_MHwd7Ro27g&t=1s
Regards Silvio