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Hobbies Electronics Enthusiasts Club, All elect/robotics lovers! pls come!
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kink_ass
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 Jun 1 2013, 12:24 AM
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Getting Started
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Hi all, I need help with my flyback converter design which I'm having problems implementing in hardware. The simulation seems to give me the results that I want but when I build it according, the circuit doesnt work, at all.  Basically, what I'm trying to do is to give 12Vdc in as INPUT and have the flyback convert it to AC and step it up to 240Vac. The purpose of this is to light up a lamp load, or any typical electronic appliance which runs on 240AC and 50Hz. Attached is a multisim 12 file of the simulation. I hope it's viewable otherwise I might need to upload a screen of the schematic..  Any sifus out there can lend a helping hand? edit: Oops, LYN doesnt allow me to attach the file type  » Click to show Spoiler - click again to hide... « This post has been edited by kink_ass: Jun 1 2013, 12:32 AM |
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kink_ass
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Jun 16 2013, 07:38 PM
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Getting Started
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QUOTE(lex @ Jun 9 2013, 11:47 PM) Everything about that circuit is wrong.  Why not use a simple push pull inverter topology?  Yeah. Just found out the hard way haha. Can't, it is required of the project to build one based on the flyback topology |
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kink_ass
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Jul 10 2013, 01:39 AM
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Getting Started
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» Click to show Spoiler - click again to hide... « QUOTE(lex @ Jul 3 2013, 11:38 AM) Example of typical flyback configuration using all-in-one PWM power I.C which has lower complexity (instead of PWM I.C + MOSFET). Source: Power Integrations: TOPSwitch-JX...  [attachmentid=3517148] Below is an example of the recommended push-pull inverter configuration. Source: Electronic Circuits and Diagram-Electronics Projects and Design: 60W inverter using transistors...  [attachmentid=3517100] All components used in that push-pull inverter are easily available (ie. common parts and does not use custom transformers). Thanks  Does anyone know where I can get customised high frequency transformers? Or rather, any shop that helps you wind a transformer according to your primary and secondary inductance specifications? This post has been edited by kink_ass: Jul 10 2013, 01:39 AM |
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kink_ass
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Jul 13 2013, 11:38 PM
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Getting Started
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QUOTE(lex @ Jul 13 2013, 09:19 PM) You could try getting transformer cores from places like RS Components, Farnell/element14, Mouser and/or Digikey. Then make a custom transformer. Do note that the core material for high frequency transformers are rather specific type (not the standard soft iron core). Alternatively search in places like eBay, Utsource, Hong Kong Inventory, AliBaba, AliExpress, etc...  I believe high frequency transformers require at least ferrite cores to operate normally.. Try the back lane at Pasar Road. If not mistaken there's a shop specializing in transformers there. Which back lane? I went to a shop selling transformers before but mostly low frequency and bulky ones. I would only get the transformer cores and frame if only I knew the proper technique of winding |
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kink_ass
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Jul 14 2013, 12:36 AM
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Getting Started
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QUOTE(lex @ Jul 14 2013, 12:01 AM) Not the normal ferrite cores in standard (low frequency) transformers, but specific grade and type of ferrite core (to avoid over-saturation) for high frequency SMPS operation. Not sure which shop you've went to, or if its the shop I've mentioned. For your information, the shop is not facing the main road and sells mostly transformers... As for manually winding the transformer, mostly trial and error. The wire gauges (ie. AWG) also for primary and secondary coils have to be considered also... Hmm, went to the one that is on the same row as NIXIE and ONLINE but a few blocks up closer to the main road. By, any chance are you good at winding? |
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