Audio smps 700w (IR2153)
- Thread starter Silvio
- Start date
hello there norazmi , long time man welcome back. i am trying to in-cooperate pfc with my smps , because i dont use regulated smps , at times when mains voltage is at 210vac the output voltage is low . when at 220vac mains all is well. but at 250vac the output is high.
the reason i was making pfc ,it is so that the output voltage will remain same from 90vlts ac up to 350vac
@ 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?
thanking you in advance steve
Silvio
Member
@ Steven
Quote
@ 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
Quote
@ 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
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
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
like which colour and size of core sir?
hi silivio , in the video ,wayuk used a black core for input inductor, my email is stevekamala@gmail.com
hi all i have finished drawing my version of smps with pfc. based on the above pfc , it will be about 1,200 wts , i will use irfp 460 fets .
your views and comments are highly welcomed and appreciated.
View attachment gtG pfc half bridge gdt smps dip schematic.pdf
your views and comments are highly welcomed and appreciated.
View attachment gtG pfc half bridge gdt smps dip schematic.pdf
Silvio
Member
Hello Steven, I was just looking at the schematic and these are a few of my taughts.
1) Why is the PFC voltage set so low? Usually we start at around 360 to 380vdc. Do not forget that the mains voltage could rise to 250Vac. This will bring a voltage of 353vdc at the pfc dc line. This voltage must always be higher than the input mains voltage. I would rather start at 370v at least. It would be best to try the pfc stage alone first and see how it holds the voltage with load. Load to 6 amps will be adequate. You may need to trim the feedback and holding time. You may need to adjust the turns in the primary to take the new voltage.
2) Regarding the oscillator and GDT, Well have you tried this before to see how it works? Keep things simple because at times the more things you add to the gate circuit the more the waveform distorts. A good waveform to the gate is the key to a successful smps. A diode parallelled with a resistor is enough usually.
3) Regarding SG chip well I have seen a lot of circuits of pro amplifiers and the way they hook this chip when no regulation is needed then proceed this way. The non inverting input goes directly to V-ref. The inverting input goes directly to ground. The compensating pin 9 is left open. The discharge resistor at pin 7 is usually 100 to 120 ohms at the frequency of operation you are using CT 1nF and RT 10K (65Khz) This gives a dead time of around 500nS to 600nS.
Lastly I am still concerned about the voltage rating of the IRFP460 in the pfc stage. Voltage spikes may exceed the voltage rating.
Above everything else you need to try it out to find out.
Good luck Regards Silvio.
1) Why is the PFC voltage set so low? Usually we start at around 360 to 380vdc. Do not forget that the mains voltage could rise to 250Vac. This will bring a voltage of 353vdc at the pfc dc line. This voltage must always be higher than the input mains voltage. I would rather start at 370v at least. It would be best to try the pfc stage alone first and see how it holds the voltage with load. Load to 6 amps will be adequate. You may need to trim the feedback and holding time. You may need to adjust the turns in the primary to take the new voltage.
2) Regarding the oscillator and GDT, Well have you tried this before to see how it works? Keep things simple because at times the more things you add to the gate circuit the more the waveform distorts. A good waveform to the gate is the key to a successful smps. A diode parallelled with a resistor is enough usually.
3) Regarding SG chip well I have seen a lot of circuits of pro amplifiers and the way they hook this chip when no regulation is needed then proceed this way. The non inverting input goes directly to V-ref. The inverting input goes directly to ground. The compensating pin 9 is left open. The discharge resistor at pin 7 is usually 100 to 120 ohms at the frequency of operation you are using CT 1nF and RT 10K (65Khz) This gives a dead time of around 500nS to 600nS.
Lastly I am still concerned about the voltage rating of the IRFP460 in the pfc stage. Voltage spikes may exceed the voltage rating.
Above everything else you need to try it out to find out.
Good luck Regards Silvio.
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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
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
thanks for the replies silvio and microsim . the smps i drew it from my existing smps which has worked well , i just added the pfc side and adjusted the gate drive to be like the above 2k smps with pfc .below the schematic of my previous smps which i have been using
View attachment gtG smps lp small bottom.bmpView attachment gtG smps lp small pcb artwork.pdfView attachment gtG smps lp small components full.pdf
View attachment gtG smps lp small schematic.pdf
View attachment gtG smps lp small bottom.bmpView attachment gtG smps lp small pcb artwork.pdfView attachment gtG smps lp small components full.pdf
View attachment gtG smps lp small schematic.pdfAttachments
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gtG smps lp small pcb full.jpg -
gtG smps lp small schematic.jpg
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hello microsim . i have updated schematic as per the recomendation , is all o.k ?View attachment gtG lp smps fb ver 1 dip drive schematic.pdfView attachment gtG lp smps fb ver 1 dip drive schematic.gif