SMPS Full-Bridge Converter

Have you looked at the application notes for some of the full bridge converter control ICs?

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John Popelish
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John Popelish
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I'm looking for a full-bridge converter project. I need a schematic preferably to build from. A parts list would be nice to. Or maybe a reference to a site with DIY SMPS. I'm looking to design a 1.3kW power supply and I need to experiment first. Any articles, references, or books with ready to build schematics would be wonderful! They don't need to be

1.3kW supplies but it would be nice to just get some experience building any full-bridge converter.
Reply to
Hudson T. Clark

I have just completed a full bridge converter design and am about to make all files public. Artworks, simulation files, design notes, etc. Can you tell me a little bit more about your application? I might be able to help you out.

regards, Bob

Huds> I'm looking for a full-bridge converter project. I need a schematic

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Reply to
Yzordderrex

I don't really have an application I just want to make a nice power supply for my bench.

Reply to
Hudson T. Clark

Your 1300 watt spec makes this a difficult project. At that power level it should include a PFC input stage, for example. Why not tone down a bit, say to the 50, 100 or even 200W level? You can make an elegant full-bridge phase-shift 200W PWM supply. Multiple output voltages, full metering, external control - these are more useful features than raw power, unless you have an application that needs raw power. In my lab, if the latter situation arises, I turn to a Xantrex supply, usually obtained from eBay for about $250 up. If you examine the guts of one of these supplies, you'll see how a 1000W+ supply should be made. Xantrex doesn't provide schematics, but you can get repair manuals for similar Sorensen power supplies to learn some of the details (but the older Sorensen models didn't include PFC).

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 Thanks,
    - Win
Reply to
Winfield Hill

That's in Chapter 1, which is just an introduction to electronics. We have more extensive discussion in Chapter 6, power supplies.

Agreed, that's being fixed somewhat in the next edition.

As for a good general-purpose in-depth book on power-supply design for Hudson, there's Robert W Erickson and Dragan Maksimovic's "Fundamentals of Power Electronics," 2nd ed.

And there's Abraham Pressman's tome, "Switching Power Supply Design," which is all about SMPS, which interests Hudson.

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 Thanks,
    - Win
Reply to
Winfield Hill

Reply to
Hudson T. Clark

Chapter six, pages 325 to 331.

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 Thanks,
    - Win
Reply to
Winfield Hill

130kW would be more useful. Enough to power a sensible 175HP motor in a hybrid vehicle.
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 Thanks,
    - Win
Reply to
Winfield Hill

I read in sci.electronics.design that Hudson T. Clark wrote (in ) about 'SMPS Full-Bridge Converter', on Wed, 5 Jan 2005:

Pages 45 and 46 of Art of Electronics even have the main equations. Much of AoE is a bit TOO non-mathematical IMHO. There is a good deal more on your topic in the AoE Student Manual.

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Reply to
John Woodgate

True, of course, but the question was specifically about filtering.

Good news.

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Reply to
John Woodgate

Not wishing to be tiresome or contentious either, :>) but "turning rectified AC into DC" also involves the various additional items you need to deal with the ac lines: switches, fuses, common-mode filters for SMPS systems, such as the OP's, etc. What I do find missing from our several-page discussion is the whole issue of transformer losses, copper resistance and leakage-inductance, and its interaction with the rectifier / filter cap, etc. Soar, droop and ripple vs load current, etc., as well as the RFI produced from sharp snap-off voltage spikes each cycle, as the rectifier diode finishes its reverse-recovery time. We've devised an innocuous way to jam this stuff into the 3rd edition.

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 Thanks,
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Reply to
Winfield Hill

Why limit yourself to a 1.3KW project? Why don't you go for 13KW?

Reply to
Fred Bloggs

I d>I'm trying to find a book that would help explain how

Page 325 is about filtering conducted emissions, a different subject. Pages 329 and 330 include information on the filter capacitor (which we used to call the reservoir capacitor, and that was less ambiguous), but so are pages 45 and 46.

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Reply to
John Woodgate

I read in sci.electronics.design that Winfield Hill wrote (in ) about 'SMPS Full-Bridge Converter', on Wed, 5 Jan 2005:

Oh, it does, but the OP doesn't yet understand the reservoir capacitor. Those other issues are lying in wait for his innocent soul as he progresses, slowly and painfully, to enlightenment.

SMPS are DIFFICULT! Except for the gurus who have designed hundreds. It's much better to start with a transformer/rectifier/regulator 'linear' supply, but then I always say that.

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Reply to
John Woodgate

I couldn't agree more...

From what I can glean from his posts the OP is a newbie to electronics and doesn't have a good understanding of electronics components let alone how to go about designing a high power SMPS. These things take time to learn.

I would suggest that he first start with a relatively simple low power linear design and perhaps in 3 or 4 years he may be ablew to tackle a SMPS.

Reply to
Ross Herbert

There'd be too much loss in the extention cord.

Reply to
Russ

What size would a full-bridge converter for 13kW be? Would you happen to know of a website with information on that? Or is there a fundamental measurement for a per-watt approximation? I have just been doing calculations from formulas I get out of these books I bought. I'm going through and studying and this full-bridge rectifier looks like it could be an interesting POWERFUL project! What are typical ratios for the transformers? Where do I get these high power transformers? Can I get ones that operate much higher than 50-60hz?

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Reply to
Hudson T. Clark

While I would hate to dent your enthusiasm for such a project Hudson, the questions you raise here are indicators that you have absolutely no experience in the design of high power electronics, let alone any other area relating to electronics. If it weren't for your apparent sincerity in these posts I would almost think you were trolling.

While not wishing to sound nosey or impertinent could you please give a brief resume of your electronics background/experience and educationional level, just to aid us in assessing your current level of knowledge and whether such a project may be within your realm. I can tell you that what you are proposing would be extremely daunting even for a highly experienced electronics professional with many years of design experience specifically related to smps design. With respect, you come across as a complete novice in this area and what you are trying to do is run before you can walk. You need to first design simple PSU's and work your way up.

If this offends then I humbly apologise for any hurt.

Reply to
Ross Herbert

I have my A.S. degree in electronics. I have experience with microcontrollers, and I don't need to build a linear regulator because I have repaired them before. I'm just in experienced in the area of SMPS which is why I am so enthusiastic about it. They seem to be really neat. I'm paticularly interested in reading some notes on making a buck regulator to REPLACE a step-down transformer/filter/linear regulator supply, like what regulator/controller to use for what application. I was thinking about making a simple buck regulator to plug into an AC outlet and use it to power a PIC, I even designed the coil and filters in spice simulation software for those power requirements. I just need to find a controller or regulator to use. I have bought EDN power supply design, and switching power supply design. They gave me a good understanding of how they work, but I'm just empty on projects. Yes I am unexperienced at designing SMPS. But anyone with a fundamental AC and DC theory education can understand this paticular application, and I do because I have taken the time to start reading about SMPS.

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Reply to
Hudson T. Clark

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