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Old 4th June 2008, 09:52 AM   #1
Tahmid is offline Tahmid  Bangladesh
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Exclamation Transformer winding

I am making a new SMPS inverter, 300W. I need help with the transformer winding. And I also want to know what frequency is ideal if I am using an ETD39 or ECR40 type ferrite core.
Which IR MOSFET is best for use over here? (I am asking for IR MOSFETs because we can not find MOSFETs from other manufacturers in Bangladesh.)
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Old 4th June 2008, 02:49 PM   #2
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etd39 and ecr40 are standard sizes for cores. Operating frequency depends on the material of the core.

Give some basic specs for the mosfets you need and use a parametric search IR's website.
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Old 4th June 2008, 08:07 PM   #3
areza is offline areza  Bangladesh
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where do u get these cores??
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Old 5th June 2008, 01:47 PM   #4
golam is offline golam  Bangladesh
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etd and ecr cores are special type E cores produced for high frequency smps use. If you use etd 39/ecr40 core, you can get 250 watt if frequency is 25 kHz, 350 watt if frequency is 50 kHz and 450 watt with 100 kHz. Very useful ha!!
I made 250 watt high frequency inverter with ecr 40 core and my turns were as follows:
Primary-- -- 3-0-3
Secondary-- 73
My frequency was 25 KHZ .
One should be very careful while making ferrite core transformer. It is better to be Primary to be set first.
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Old 5th June 2008, 01:47 PM   #5
golam is offline golam  Bangladesh
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regarding mosfet. I used irfp 054 which is of 60 volts and 250 watt and its resistance of drain to source during on is 14 mili ohm. It is to 247 type. It is very sturdy and reliable and useful for high frequency use.
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Old 5th June 2008, 01:47 PM   #6
Tahmid is offline Tahmid  Bangladesh
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Actually I am a student of class VIII. I cannot buy the parts myself all the time.
Last February, I went to New Delhi with my father to see the electronics fair in Pragati Maidan. There I found different companies producing Ferrite Core. One of the companies, Hinoloy, presented me 3 ETD39 and 3 ECR40 cores and the engineer told me that these cores are useful for high frequency inverter. From then on, I am doing test and trial with these cores.
I produced one high frequency inverter for 200W capability but it gets hot after fifteen minutes or so and cannot withstand more than 20W for longer duration. Once I tried with 200W bulb and it could take the load for fifteen minutes, but after that all the parts became hot and could not take the load. Probably my configuration regarding frequency, turn, driver and MOSFETs require detailed modification. I require help from everyone for that reason.

PLEASE HELP ME IN THIS REGARD.
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Old 5th June 2008, 03:12 PM   #7
areza is offline areza  Bangladesh
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maybe you r too early for this kind of electronics involve lethal voltage would kill u or injure u seriously, obviously its not a beginner kind of think, safety is must,

for ips u really need two stage inverter , first one 12v dc to 22v dc , second one 220v dc to 220v ac , if u want to use inductive load like fan ,
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Old 5th June 2008, 03:13 PM   #8
areza is offline areza  Bangladesh
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u can make the transformer as golam mentioned , make sure the frequency is ~25khz to ~30khz and not less then 23khz or u would go into core saturation when temperature of the core rises, it seems u already having this problem after 15 min of 200 watt load, for now u can use irfz44 or irf3205 or whatever u have in ur hand, just put each set of mosfet on separate heatsink, use tight layout with minimum ground loop for mosfet to gate driver, so the mosfet will work properly and dont get hot and start to smoke,
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Old 5th June 2008, 04:02 PM   #9
Tahmid is offline Tahmid  Bangladesh
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For the last two years, I have been deeply associated with electronics. I have been trained intensively by my father and have undergone different courses. I have already constructed a 300 Watt Linear IPS which I am using in my room.
Linear system is inefficient and bulky transformer is required, which is a real nuisance. That's why I am moving onto SMPS. For the last six months I have tested different SMPS circuits and am now quite confident that I can tackle such complex circuits. I have read different books on SMPS written by renowned power electronics writers.
Obviously, this is all going alongside my studies and schoolwork. Power electronics is my hobby. I have a complete laboratory in my house. I hope, with the guidance of you all, I can make my circuits effective and successful.
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Old 5th June 2008, 04:08 PM   #10
Tahmid is offline Tahmid  Bangladesh
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Where comes the matter of core saturation, I do not see how that would occur, because my oscillator is running at 30kHz.
But probably, some error in my circuit is causing heating. (This is my view.)
Anyway, I am constructing a new control circuit and transformer according to the details given by golam.
Special thanks to golam for the transformer details and areza also for the explanation.
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