hello silvio and stewin, i will go with ir2153, easy, cheap, and has and option there is many way to limit the current a.k.a OCP with ir2153.
NCP1635 is not the best choise chip for PFC, but you could experiment with it.
Cores from https://www.mag-inc.com/ will do the job perfectly, look for the suitable core for your application.
You may also view here my latest PFC experiments.
[video=youtube;_sbvyMyv3Qs]https://www.youtube.com/watch?v=_sbvyMyv3Qs[/video]
Hope that helps
@ Steven
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@ silvio what core may i use and how many turns should i turn? i have lots of iron powder cores t130-10(black core) t130-26(white yellow core) and t130-52(blue green core)
which of the above should i use and how many turns should i turn?
Regarding the core used this is based on firstly the power to deliver. This has to be large enough so that it can handle the power that it has to deliver without saturation. To my believe a sandust core is suitable for this purpose. Microsim can also recommend the type of core to be used in pfc as he had already experimented with it.
I Have an XL file using the NCP1653 PFC chip to work out the pfc circuit according to your need but I cannot upload it here as it is saying that the file is not valid. You can send me your mail address and I will post it to you.
regards Silvio
PFC should be set at 380VDC as minimum as going lower than that requires redesign of the loop.
And the most important thing to remember is to test at 100VAC as this is the point that shows if your PFC is working or not.
Also, the point when you go from no load to full load is very critical as it will confirm your entire design success.
Hope that helps
Hi Ionut,I read this post a few times, I also watched a video on youtube but I still don't understand which part of the scheme you kept and how you added the current transformer in the scheme. maybe you can help me understand. thank you very much
I used voltmeter and ammeter like you to measure input and output. I do not have a wattmeter. How do you know if 60kHz or 90kHz is better?If you built the 700w smps it is half bridge topology. The transformer must NOT have any gap in the center core. If you are measuring the input with volt meter and amp meter you will not get the true power because of the power factor. The input shall be measured with a watt meter to make your comparisons. On the secondary DC side you can measure with volt and amp meter and you get a good result.
Regarding the frequency of operation it can be between 60-65Khz.
If you want to know how to calculate the RC values for the frequency you can check the datasheet of the IR2153.
Regards Silvio