Offline full-bridge SMPS....need help - Page 126 - diyAudio
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Old 27th January 2014, 06:34 PM   #1251
stewin is offline stewin  Kenya
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hi all cool link diysmps and very useful Calculation programs for transformers and inductors diysmps
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Old 10th March 2014, 10:36 PM   #1252
stewin is offline stewin  Kenya
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my latest lay out. but i will use external aux +12vlts
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Old 13th March 2014, 10:25 AM   #1253
luka is offline luka  Slovenia
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is this what I had just without -12v aux's? same size core, or did you go for 49?
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Old 13th March 2014, 09:06 PM   #1254
stewin is offline stewin  Kenya
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i used the 12vlts using droppers but they got hot .so i prefered using small 12vlts power supply to start the oscilllation.
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Old 19th March 2014, 08:13 PM   #1255
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Hi Stewin, long time. According to mosfet datasheets, the maximum pulsed drain current is much higher (four times in IRFP 460- 80A) than the maximum continuous current. Since in smps the primary current is pulsed, I assume the maximum pulsed drain current is used when selecting a mosfet. Is there anyone who has had a mosfet failure related to overcurrent in the primary? That is assuming it was not dead time related failure.
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Old 21st March 2014, 06:22 PM   #1256
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There is a good chance to blow the MOSFETs during power up, when the transformer is shorted by the secondary caps,
or, in case the transformer is driven into saturation.
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Old 5th May 2014, 08:28 AM   #1257
stewin is offline stewin  Kenya
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hi all by the way my above project worked perfectly with some few adjustments. i used irf740 and all was powerfull and o.k

now i wanted to do one with protection and transformer gate drive . as to do a full bridge in the near future.

Last edited by stewin; 5th May 2014 at 08:40 AM.
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Old 12th May 2014, 01:31 PM   #1258
fhoenix is offline fhoenix  United States
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good design sir stewin
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Old 19th May 2014, 09:40 PM   #1259
chas1 is offline chas1  Dominican Republic
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Default ATLK6 smps simulation

In this thread the the K6 smps there were questions if it worked as designed, so I am posting all the LTspice simulations I used to simulate the design and you can be the judge.In order to run the simulations you must have a copy of LTspice which is a free download, then make a folder in LTspiceIV and name it atl or any other name you choose.Remember to make simulations run faster only the bare bones are used but I think its ok.I have tested the zip file( I used Jzip) is complete but if have problems or you get an error that something is missing, let me know.Feel free to comment or make additions as this might help other DIY who lack spice experience.I tested the 42volt,56volt and 82 volt outputs as well as simulating a short on the outputs,by no means is this a complete design it is only for simulation,try it..
Attached Files
File Type: zip atlk6.zip (52.9 KB, 26 views)
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Old 19th May 2014, 10:33 PM   #1260
stewin is offline stewin  Kenya
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hi all the smps works well i am from testing it.the transfomer gate drive i wound it bifiliar mode .and the protection does indeed work,but i will do more tests and posts pics and results
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