tag:blogger.com,1999:blog-6338993703407602171.post5385172807071787410..comments2024-03-28T23:21:04.213-07:00Comments on Tahmid's blog: Learning SMPS the hard wayTahmidhttp://www.blogger.com/profile/09117804893438710050noreply@blogger.comBlogger25125tag:blogger.com,1999:blog-6338993703407602171.post-73690849047034285072021-01-14T21:23:11.728-08:002021-01-14T21:23:11.728-08:00Hello Tahmid.
I would like to know what are the c...Hello Tahmid. <br />I would like to know what are the causes and the remedies for reducing the ringing in switching waveforms. <br />I am trying to build two level inverter. As long as my DC bus is not energized, my gate pulses seem to be fine. But Once I increase the DC bus voltage, I see an envelope like half rectified sine wave over my gate pulses. Also my individual gate pulses are going very bad causing tripping of my circuit. can you please suggest with your experience why this envelope is appearing over the gate pulses. Your help will be highly valued to me ..<br />Thanks<br />valli<br />vallihttps://www.blogger.com/profile/11947584364186565341noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-65674880796646457582017-06-29T21:25:41.165-07:002017-06-29T21:25:41.165-07:00Sir
I want to make a flyback transformer for conv...Sir <br />I want to make a flyback transformer for converting 230v ac into 12v dc.<br />please help me to design it.I need an out put current of 2A. I decided to use ee25 ferrite core.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-68560052082631690462017-02-23T10:59:47.861-08:002017-02-23T10:59:47.861-08:00what are effect magnetic field (from inductor) o...what are effect magnetic field (from inductor) on Semiconductor Device such CMOS , Schottky diode , BJT , IGBTetc ?Anonymoushttps://www.blogger.com/profile/03900674011731395303noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-17284976659588827812017-02-23T10:24:09.744-08:002017-02-23T10:24:09.744-08:00I am trying to make boost converter, please sugges...I am trying to make boost converter, please suggest some PWM current ic including soft start up.Anonymoushttps://www.blogger.com/profile/03900674011731395303noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-19893619212546967882016-09-27T05:15:32.902-07:002016-09-27T05:15:32.902-07:00HELLO TAHMID
I AM VERY MUCH INSPIRED FROM YOUR BL...HELLO TAHMID<br /> I AM VERY MUCH INSPIRED FROM YOUR BLOG <br />ITS VERY INSPIRATION FOR NEW BEGINNERS .<br />CAN YOU PLEASE SUGGEST ME A GOOD BOOK FOR BASIC ELECTRONICS AND ANALOG CIRCUITS AND DESIGNEAnonymoushttps://www.blogger.com/profile/10411265881840383721noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-91757691638889613922015-12-03T04:29:23.584-08:002015-12-03T04:29:23.584-08:00Hello Tahmid,
This is really very nice blog for b...Hello Tahmid,<br /><br />This is really very nice blog for beginners....<br /><br />Dear All,<br /><br />If you require electronics components for SMPS design including Transformers, Inductors, Diodes, ICs then you can order us at info@rathyelectronics.com (Only for India).<br />We also do EMI EMC Consultation for clearing test like CE, RE, EFT, Overvoltage Hi-Pot Test etc...<br /><br />Regards<br />Rathy Electronics<br />http://www.rathyelectronics.com/components.htm<br />Anonymoushttps://www.blogger.com/profile/00549444104886960619noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-72203022345922061662015-08-27T03:29:29.829-07:002015-08-27T03:29:29.829-07:00hi,
i am working on smps.I want to make 5V,1A usin...hi,<br />i am working on smps.I want to make 5V,1A using flyback ferrite core transformer. i am using viper22a ic i hope you r knowing that Ic.but the problem is i am not getting exact calculation of primary, auxiliary and secondary windings calculation.its frequancy is 60Khz.<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-78783436933728935082014-09-26T01:08:43.518-07:002014-09-26T01:08:43.518-07:00Hello Tahmid! good blog, sounds lots of work behin...Hello Tahmid! good blog, sounds lots of work behind...<br />I'm working on a small inverter 200w. push pull bridge can feed 10Amps. But with no load i can reach 300-400Vac @60Khz.<br />But I can't keep this voltage when a load is plugged i just can reach 60vac @ 30W...... My core is 2+2 primary 60 secondary.<br />Could you tell me what kind of things can be responsible of this loss of power? i feed 8A@12VDC primary and i can just get merely 30W.... primary winding is 3X0.5mm² in parallel. Best regards. B.H@FRAAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-76453207640957571662014-04-25T11:11:15.271-07:002014-04-25T11:11:15.271-07:00hello tahmid hope u will be fine. i want to desig...hello tahmid hope u will be fine. i want to design 22 Waat Led driver circuit which have input 190VAC to 240VAC and output is 20VDC to 40VDC and output current is 580 mA. and power factor is 90%.please tell IC and circuit which is used to design 22Watt LED driver circuit....Anonymoushttps://www.blogger.com/profile/13443925928991579284noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-48332619932159493612014-04-23T12:54:27.009-07:002014-04-23T12:54:27.009-07:00It's better to test on a current limited sourc...It's better to test on a current limited source first if possible to prevent damage. Unfortunately, I did not have a current limited high voltage power supply which is why I could not do that. So I just connected it to 220VAC with protection (fuses, current protection, etc).<br /><br />For the MOSFETs, I turn power supply off, let capacitors discharge and then feel the temperature.Tahmidhttps://www.blogger.com/profile/09117804893438710050noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-22559123407800453072014-04-16T05:29:07.772-07:002014-04-16T05:29:07.772-07:00hi
i have a general question when you make any pow...hi<br />i have a general question when you make any power supply ,when you run it you directly apply it with 220V AC or you use some variable power source for first time ,and how do you keep noticing the temperature of mosfets is by some thermo-camera or just by touching it.<br />Best Regardsfarhan alamhttps://www.blogger.com/profile/10505244744600735086noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-28110123423111887552014-04-05T01:37:06.516-07:002014-04-05T01:37:06.516-07:00hello tahmid,
I have designed a non inverting buc...hello tahmid,<br /><br />I have designed a non inverting buck boost converter.<br />I am having a problem with the snubber circuit. Can you post about the RCD turn off snubber circuits to supress the transients?<br />I would really appreciate if u do.<br /><br />thank you in advanceAnonymoushttps://www.blogger.com/profile/07951325184437513930noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-48479552681385494122014-03-14T04:25:51.986-07:002014-03-14T04:25:51.986-07:00hi tahmid
we are designing flyback converter with...hi tahmid <br />we are designing flyback converter with following parameter:<br />input voltage:230V<br />output voltage:5v<br />frequancy:70Khz<br />switch MOSFET:IRFP250N <br />Diode: Fast Recovery Diode B860<br />transformer: primary turns:88<br />secondary turns:2<br />problem is that switch or transformer get heated when we apply voltage above 90(at that time current is 0.95A).<br />we intechange secondary terminal also.<br />Increase Frequancy up to 120Khz to avoid core saturation.<br />but nothing improvement.<br />can you please help?<br />My email ID is suhelshaikh21@gmail.comAnonymoushttps://www.blogger.com/profile/10965735023157662948noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-57722058860565028332014-03-02T11:41:13.396-08:002014-03-02T11:41:13.396-08:00Hi
thank you for your reply, can you give some goo...Hi<br />thank you for your reply, can you give some good idea how to remove core from a transformer,if we get a transformer from a old pc power supply and want to re wind it. because it has glue or warnish over it due to which its not possible to easily remove core.farhan alamhttps://www.blogger.com/profile/10505244744600735086noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-17046365943648487602014-02-21T21:50:02.850-08:002014-02-21T21:50:02.850-08:00I'm sorry. I can't meet you since I'm ...I'm sorry. I can't meet you since I'm not in Dhaka anymore. If you need help, you can always find your answer using Google. For SMPS design, I recommend getting some of the books I mentioned and reading through them. That will be most helpful. Start with Marty Brown's "Power Supply Cookbook".<br /><br />Feel free to ask if you need help. Good luck!<br /><br />Regards,<br />Tahmid.Tahmidhttps://www.blogger.com/profile/09117804893438710050noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-55103049476802736392014-02-21T21:47:47.704-08:002014-02-21T21:47:47.704-08:00A lot of oscilloscopes have a 10:1 probe that can ...A lot of oscilloscopes have a 10:1 probe that can be used to detect higher voltages. The one I had at home (and it wasn't even a great oscilloscope) could read more than 500V easily.<br /><br />Regards,<br />Tahmid.Tahmidhttps://www.blogger.com/profile/09117804893438710050noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-69543552320701797412014-02-21T21:46:32.966-08:002014-02-21T21:46:32.966-08:00I've learnt most of my SMPS from those books. ...I've learnt most of my SMPS from those books. If you finish reading them all and understand the content, you can probably do more than I can. There are a lot of difficult concepts in SMPS. I don't even understand some of those. However, if you understand most of it, and are willing to learn from practical experience (read: loads of mistakes, circuits going wrong, MOSFETs and drivers blowing up, etc) and learn from your mistakes, you'll make good progress quick.<br /><br />You do need prior knowledge in electronics. Grab some basic electronics books and start reading them as well - it might be better to do that before delving into SMPS.<br /><br />Feel free to ask if you have any more questions. Good luck!<br /><br />Regards,<br />Tahmid.Tahmidhttps://www.blogger.com/profile/09117804893438710050noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-11501225309839699622014-02-15T09:36:22.352-08:002014-02-15T09:36:22.352-08:00Hello Tahmid, your work is really impressive! You ...Hello Tahmid, your work is really impressive! You have really inspired me. I started learning electronics about a year ago and I have a real passion for it. I rarely go a day without learning something new. Anyway, did you learn most (85%) of what you know from the books you listed? I am buying them one by one because I really admire what you have accomplished. Do you think by the time I finish reading and understanding all the content in those books, I'll be in position to do what (or at least most) of what you have done? Do I need a lot of prior knowledge in electronics, or do the books pick up from nothing. I know all about DC passive circuits (chapter 1 of all about circuits), most of AC circuits from the same site, most chapter 3 (semi conductors), and I'm currently reading chapter 4 (Digital) circuits. I recently made a simple analog charge controller for a 6 volt 4.5 amp hour battery.<br />Do you thin what I know is enough to get me started on reading the books?<br />Thanks for you time, have a nice day.Anonymoushttps://www.blogger.com/profile/18035069523983685724noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-90111115212680815782014-02-08T14:37:09.429-08:002014-02-08T14:37:09.429-08:00Hi
i want to know that if you have build a fly-bac...Hi<br />i want to know that if you have build a fly-back topology based SMPS,which runs from 230V AC or any topology the voltage over mosfet will be higher than 300V and most oscilloscopes can measure up to 300V with standard probe. so do you use some differential probe or you estimate mosfet voltage by calculation .and never required to check voltage over mosfet.farhan alamhttps://www.blogger.com/profile/10505244744600735086noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-80641878647296210602013-08-27T20:52:00.650-07:002013-08-27T20:52:00.650-07:00Very, very impressive, Tahmid, especially at your ...Very, very impressive, Tahmid, especially at your young age. It's also impressive that you've come so far with the resources you had. In my area (silicon valley, california), surplus electronic parts are plentiful, and I can get many of the parts you had to hunt for (MOSFETs, IGBTs, torroidial cores of any given type ferrite) either cheaply or free. Although I've had some experience with SMPS design in my formal job, I find that there is much I can learn from you, and will be visiting again.<br /><br />You write well, so I think you should collect your knowledge of SMPS into a book, and get it published!Roderick Younghttp://pididu.com/wordpress/noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-9431013894256310742013-02-07T04:15:42.293-08:002013-02-07T04:15:42.293-08:00Tahmid i like to meet with u personally.ur tutoria...Tahmid i like to meet with u personally.ur tutorial and explanation method inspire me.i also love to design with mcu based system.right now i try to learn smps design and implementation.but the main problem is that i do need some guide line where to start first.this is may mail id: mahmud.ibrahim021@gmail.com. just knock me and let me know when ur free to meet with me.it will be very helpful for me like a brother u stand side by side with me.<br /><br /><br />Dhanmodi<br />Dhaka, Bangladeshelectronic and Microcontroller turorialhttps://www.blogger.com/profile/11451482184634007221noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-10200742075641962002013-02-04T08:31:59.364-08:002013-02-04T08:31:59.364-08:00What a great story. Finally, I found your page. I ...What a great story. Finally, I found your page. I know about you Tahm1d since back on 2009 or 2010 at s**sivri forum. You have great post over there. But sadly to say, that I cannot join the forum since it is by invitation only. And now, I've found your blog, thanks God.<br />Well, I love SMPS like you do. Because good power supply is needed in every electronic device. But, learning SMPS is not quite easy. So, by sharing experience with the expert in SMPS like you, will make my learning eazier.mhtoxadhiehttps://www.blogger.com/profile/17769266417927605286noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-74951919162288910252013-01-11T11:05:05.065-08:002013-01-11T11:05:05.065-08:00Wow what a effort!!! Thanks a lot for your tutoria...Wow what a effort!!! Thanks a lot for your tutorials they are helpfull and your story reminds me to myself. I also want to write some tutorials when I got my projects really working ! I love smps too. I keep watching for a good explaination about "compensation" I am sure you would be explain it perfect. Great blog!!! Thanks for your efforts Tahmid.<br /><br />Best Regards TimurTimurnoreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-11703584873975463032012-12-29T08:38:00.476-08:002012-12-29T08:38:00.476-08:00Thanks.
I wish you success in your endeavors.Thanks.<br /><br />I wish you success in your endeavors.Tahmidhttps://www.blogger.com/profile/09117804893438710050noreply@blogger.comtag:blogger.com,1999:blog-6338993703407602171.post-41282890589886397162012-12-28T04:25:12.064-08:002012-12-28T04:25:12.064-08:00An amazing post. Your story inspires me, and many ...An amazing post. Your story inspires me, and many others, I am sure. I have decided to study SMPS circuits, and I stumbled upon your blog :-)<br /><br />Jay.Anonymousnoreply@blogger.com