Pcb design in bhosari [Guide]


Table of Contents




Last updated : Aug 30, 2022
Written by : Ouida Oksen
Current current readers : 4846
Write a comment

Pcb design in bhosari









Did you find this article relevant to what you were looking for?


Write a comment




Pcb design in bhosari


Comment by Casey Wayson

Thanks for this great article


Thanks for your comment Casey Wayson, have a nice day.
- Ouida Oksen, Staff Member


Comment by stallonei

welcome welcome everyone to to PCB West 2013 session 9 switching power supplies my name is I'm your speaker and my name is Scott Nance I'm a senior printed circuit designer at optimum design associates I've been a PCB designer in the Service Bureau industry for 30 years I'd like to point out that I'm not at electrical engineer on our power supply designers so this presentation is from my perspective and that is out of a printed circuit designer so the reason for this presentation I think is kind of simple switching power supplies in their layouts or everywhere we see them in simple designs tough designs cheap consumer products and your high-end phones we see them throughout our computer supplying the power and all throughout the computer at point of loads so that's the reason for the presentation the reason that I'm here is that we we were it was suggested by my boss that we each take an article to write and mine was switching power supplies and I invite you to look at some other articles that were written by other designers from opt-in design you can find them but design in the trenches calm and they are there covering topics like DDR timing rationale silkscreen valor NPI OD B plus plus and several others so you can see abstracts of these articles at again design in the trenches comm we see that there's tons of available information about switching power supplies for the electrical engineer volumes about magnetics and power loss but there's a there's notice a much good information for the PCB layout professional and I think this this this presentation might help clear up some of the confusions that PCB designers have when it comes time for a switching power supply we need to be able to identify it and be able to lay it out so that each layout acts and intent and is and is uh it works as the manufacturer intended and so I intend to briefly tell the history of switching power supplies we won't spend too much time there and then explain how they work and then I'm going to provide some specific layout techniques and examples some do's and don'ts and then all this is just meant to provide the lay out professional with enough information that he becomes empowered to become a better member of his design team so let's begin the agenda first of all switching power supplies what are they where they look like how do we identify them how do they work and then we'll get into the PCB layout and that'll be probably more fun but we'll get to that as soon as we can and then if we have time we have some power supply basics or review and at any time if anyone has any questions or anything is unclear please feel free to ask questions and we'll see if we can get to them in the time allotted so again switching power supply history this is going to be a short just recap on where they've been not where they're going but just a short where they've been where they have been where they came from and then we're going to go over some supply types and topologies so you can identify them as a PCB layout professional it might not be as as important to know these things because most of these decisions have been made before they ever get into layout the engineers already decided all the parameters for the switching power supply we'll get more into the meat of it when we get down into switching power supply circuitry a little bit of the history the the switching power supply histories that the principles were known in the 1930s they were used on condensers and arc welders and things of that nature IBM used it in their 7:04 mainframe and of course it was giant and not as efficient as the switches that we see today NASA used them Telstar satellite is a good example and then the famous one is the Apple 2 personal computer because the switching power supply was introduced and actually made the computer small enough and light enough that it could be used in the home so there's lots of people that want to take credit for the popularity the switching power supply Apple comes to mind rod Holt was the engineer that introduced it in the Apple 2 and he got a lot of credit which witches do but he did not invent the switching power supply he only applied it to the home computer what really should be credited with the explosion of popular switching power supplies are innovations in the semiconductor industry which are going to be the controller chips that control the switching power supply and make them efficient and the other thing was a power it was needed that a power switch was needed to be able to quickly switch high currents and the vertical metal-oxide-semiconductor power transistor support enabled this and that's that's a fab term for vertical metal-oxide-semiconductor it's the fab process for the chip and it allowed for the quick switching this was important for consumer products because at the time bipolar transistors were used for a while and they work very well for high power applications but they didn't switch yeah in the older days nowhere near switch fast enough and what happened was the switching frequency wasn't above the audible hearing range of humans so we hear things like squeals and TVs and things like that and and now the frequencies are much higher and they're way more efficient because of that so a little more history these switching power supplies used to be called switch mode power supplies motorola started enforcing their trademark so they no longer are called that they're called variations they're called they're often called switched mode switching mode or SMPS I like the universal term switcher because it applies to all of them and I'll be using that term from now from this point forward so when you think of a switching power supply though if you're shopping for a switching power supply what comes to mind is the computer main supply it's actually more than a switching power supply and I'll show you in a minute but it's it we call that a power supply unit and that's what sources the mains voltage the 110 and supplies all the voltages through the computer that you need additional regulation is happening at the controller at the graphics card in any other place that's stepping down the voltages from the main power supply and we call those regulators or point of load and this is just that's a little example of a little linear ball grid array point of load regulator so here's some examples just it's it's a showing of pictures of the vast difference and maybe maybe adding to the confusion of what is a switching power supply the computer main power supply a cellphone charger an adjustable laboratory-grade switching power supply the linear ball grid array which looks looks benign but it's really that one's quite exotic an off-the-shelf module that you could use for for applications that would work for off-the-shelf and then that's a car audio 800 watt power amplifier so here's a block diagram of the computer PSU that I was talking about as you can see the first stages of them are really preparing the voltages for the switching power supply fuse EMI filter rectification if you know about power supply after rectification it becomes a DC voltage so really the s


Thanks stallonei your participation is very much appreciated
- Ouida Oksen


About the author



Pcb design in bhosari

All you ever wanted to know

about "Pcb design in bhosari".



Pcb design in bhosari

Try Not to laugh !

Joke resides here...


Tags


Follow Us on Social Media






Pcb design in bhosari

Pcb design in bhosari