What Happens if You Change the Load & Source Voltage of a DC-DC Converter? + Wave Winners
Ғылым және технология
How well does a DC-DC converter work in the real world? Load regulation and line regulation tests will tell you!
Sign up now for Wave : bit.ly/YTWave2020
Click to subscribe! ► bit.ly/KLabs_sub ◄
Ideally, when you set your DC power supply to a certain voltage, it will maintain that voltage and have little or no noise. However, many external conditions can affect the power supply's output. Since, a power supply is used to power a device under test (DUT), any variations or noise in the output is directly coupled to the DUT. Following are some of the commons sources of unwanted power supply signals, and how they are specified in a data sheet.
Loads often require varying amounts of current. Load regulation is a power supply's ability to maintain a constant voltage regardless of the demands of the load for more or less current. A power supply's load regulation specification tells how accurately the voltage will be maintained for example the E3632A load regulation is specified as 0.01% of output plus 2mV. A power supply's transient response specification tells how fast the power supply can return to the desired voltage for example, 50mseconds for a large change in the load.
Changes in the AC line voltage can affect the output of a DC power supply. In some regions, AC line voltages can vary greatly. A motor or piece of large equipment can cause voltage to drop in power lines when it pulls excessive current. The ability to maintain a set DC voltage during a change in line voltage is specified as line regulation. Line regulation is typically specified in two ways. First the power supply will only function properly if the AC line voltage is close to the proper voltage, typically ± 10%. Line regulation also affects the output accuracy and is specified as a percent of output with an offset.
Helpful Links:
Keysight Bench Facebook page:
/ keysightbench
Keysight RF Facebook page:
/ keysightrf
EEs Talk Tech Electrical Engineering podcast:
www.eestalktech.com
/ keysightpodcasts
Check out our blog:
bit.ly/KeysTechBlogs
Twitter: @DanielBogdanoff:
/ danielbogdanoff
Today we’re exploring how to test a DC to DC converter. We’re going to use a 60W, 24 V to 12 V DC converter. We’re going to stress the converter in two ways - first we’ll do a line regulation test, which means we’re going to vary the input power and see how it affects the output. Second, we’re going to do a load regulation test. For this test we’ll vary the load on the converter’s outputs and see how the output power changes.
To do that, Bill brought along a power analyzer, which is essentially a fancy control system with a chassis that you can load modules into. This one has a 100 W supply module that will supply power to the converter’s inputs, and a 100 W electronic load module which we’ll use to sink power from the converter’s outputs. To control it all, we’ll use the new Advanced Power Control and Analysis Software, which is part of the Pathwave BenchVue platform. This makes it easy for us to control the supply and load dynamically.
The converter has two sets of inputs and two sets of outputs so we can do 4-wire sensing: one set carries power, and the other set allows the system to readback the values and adjust its outputs.
For our first test - line regulation - the power supply will output a series of different power levels using an output list. We’re then measuring the converter’s output to see how it changes.
We can select a built-in arb to turn on the load during the test -A pulse 0 to 3A .4s,9s,.6s
The electronic load has four modes of operation - voltage, resistance, power, or current
Turning of the load after 9 seconds will remove the load from the converter while it still has power.
The last thing to do once you have this setup is to run it for a long period. Ideally you also don’t have to sit there and watch it run for 3 or 6 hours, so you can use data logging. This lets you set it, walk away, and see how it performs for a while.
And, if something looks funky or you need to get documentation setup, you can export just that piece of the record - historically you’d have to export whole thing.
This power analyzer also has a scope capability. You can trigger and zoom in on short events like an edge and get a peek into your system without having to pull out an actual scope.
Another thing you can do with this is setup a level trigger and have it do something if the trigger condition is met. For example, you could shut down your outputs if the voltage or current gets too high - this could definitely save your device if things go south.
#LoadRegulation #LineRegulation #SourceEffects #DCDCConverterTesting #DCDCConverter #PowerAnalyzer #electronicload #PowerElectronics #BoostConverterTesting #BuckConverterTestging #electronics #electricalengineering #computerengineering
Пікірлер: 116
I know that these are basically just 8 minute ads, but I really like what you've done. Good content, entertaining, well paced. Plus it makes me want to buy a power analyzer. (Where's my PO template ....?)
@KeysightLabs
4 жыл бұрын
Thanks!
Woah! Wait! What???? I know one of today's winners, c'est moi! Thank you, Daniel and all of Keysight for this unbelievable prize. It will go to great use resuscitating retro computers and also testing and implementing new electronics maker projects. Again, a big thanks to Keysight for running another super-generous Wave event and congrats again to all the other winners-enjoy your new bench test gear.
Wow, Keysight finally broke my record of never winning anything! I was of course after the oscilloscope, but hey, I won the DMM! Thanks a bundle, Keysight, it actually comes in handy and I’ll certainly NOT sell it-it will straightly end up in my lab!
@KeysightLabs
4 жыл бұрын
Congrats!
@Moonbase59
4 жыл бұрын
@@KeysightLabs Thanks! Will you contact me via email?
It’s always amazing to see a Keysight video with tons of information that many people can find interesting. Another great video!
5:23 I was so hoping you'd say "come back to a bench on fire" or something
Where can i find a link to purchase that awesome ruler? Would come in handy in my design classes!
Excellent equipment. Every electronics designers dream.
Congratulations winners! Im just here for the outtakes at the end (and frogger). 😁
very cool videos, thank you
It came to me today, could you add a diode, dummy resistor and another diode in parallel after the primary load to increase current draw in a linear path?
Grats to the winners! Praying to the electron gods that I’m as lucky as you!
@MindFlareRetro
4 жыл бұрын
Hey Alex. Use ElectroBOOM's link (bit.ly/EBoom2020) to enter Wave every day and you'll get a 2nd entry per day. Better odds.
Ah, some good quality content. I really like the previous videos, so informative and well edited. Sadly i cant afford such high end equipment cause im a cheapo hobbyist :D
Got another DC-DC converter test for ya! This time with a power analyzer. EDIT: I came up with the joke for the end..."This is really going to help make my eye diagrams look more open" Wave sign up & resource library access: bit.ly/YTWave2020 Edit: looks like we forgot to add music on this tip! Trying out the KZread Music thing :)
Thank You
Eye see you... please fix the next drawing so that my name comes up as the tier 2 winner. Thanks!
nice video thanks
Hi.Best not forget the Max. Power Transfer Therom as a start off.
@kingsman428
4 жыл бұрын
Yeah when the internal Z = the load Z
It hurts me to know how many people are probably putting these up for sale after winning *cries*
@KeysightLabs
4 жыл бұрын
We do see a little bit of that, but the majority of folks are really happy to get & keep what they win.
@CNe7532294
4 жыл бұрын
Warning: Legalese in this post. Worth it though if naive to taxes and lotteries/drawings. Yes, eyeing at college students. Especially with debt in particular. Likewise, kids under 18 yrs old asking parents or someone older to enter for them. You may know this already but to others, one word. "Taxes". That why you read the terms and conditions. I'll even save time looking for it. "7. Taxes. All federal, state and/or local income and other taxes and duties, if any, are the winner's sole responsibility." Lots of people get giddy entering lotteries without planning out things which is sad but people will eventually live and learn. This is why in Tiers 1 and 2 you have a choice. As they have the most expensive price tags relative to Tier 3. Taxes are based on tax rate (based on how much you earn) and FMV (Fair Market Value) which is just a fancy term for how much the seller (i.e. Keysight) sets selling an item for. Selling online (e.g. Ebay, Craigslist, etc.) is not a guarantee of maximizing "profit" either. Especially after the Wayfair ruling (if in the U.S.A. unless lucky to live in 1 of 5 states with no sales tax). Wayfair essentially making most states able to collect online sales tax which would take yet another massive bite out of sales earnings (i.e. selling to a buyer in California, usually 9.75% or Texas usually 8.25% but can be lower depending on local laws). There is a such thing as a re-seller's permit that "excludes" this (doesn't feel different from the next sentence though) but doubtful Joe average entering on here even has one. As a seller you can compensate for that (by raising the price tag) however, that of course lowers the chances of a fast sell. Again, all this may or may not be legal depending on where you live. I don't live in other countries and therefore its your responsibility to know your country's tax code. Otherwise, expect fines too if you break the law! Usually, but there's also something called jail time too! Taxes and law are also partly why this drawing isn't even allow for whomever is watching. Best they can do is know someone willing to send them the winnings, move to another country allowing this or change lottery law in their country if that's the case. Lots of people ironically have gone bankrupt after winning something because they didn't know and went crazy with their winnings..... TL;DR: It doesn't hurt to dream but be realistic with your dreams. Its your responsibility after all as an adult 18 yrs or older.
@HA7DN
4 жыл бұрын
@@CNe7532294 Eeek, now I'm glad I did not win one (yet). It's hard to imagine that someging like this would not exist in my country (Hungary), where they like to tax freakin' everything...
I'm wondering if entering none as my job (cause I'm not working in any company) made me disqualified :/
@WojtasProduction
4 жыл бұрын
i was wondering the same
@TombunnyHunter
4 жыл бұрын
I was wondering the same as I put "n/a" for company.
@KeysightLabs
4 жыл бұрын
Nope! Not a required field, so you should be fine
@darer13
4 жыл бұрын
i put hobby as mine lol
@shifter65
4 жыл бұрын
@@KeysightLabs What would disqualify an entry? If we received a confirmation email after filling out the form, can we safely assume our entry is valid?
Why does the logger not show the vertical scales on the axis? ie. at 0:41 I can see the spikes on the green "output 2" (input to DC to DC) voltage but don't know what the voltage is that it is spiking from (above and below).
@KeysightLabs
4 жыл бұрын
It does show the scales at the bottom of the screen, but we cropped in so you could see the waveforms better
That power analyzer was really cool :D only 2 days am crossing my boddy :D
Well, didn't win anything, but Daniel knows that we enter, Daniel knows that we care... Daniel is watching, he has his eye on us! (sorry, really terrible joke, but I've had a long day, and it's the best I could come up with!)
@KeysightLabs
4 жыл бұрын
The eye of Daniel is always watching
thank mr keysight
I know I am never getting this _▪_ Anyway LOL Love you as the host!
In Automotive, you usually test the supplies with pulses, that can have short duration or large steep. How well this machine would simulate for example the load dump pulse? Or is it too slow for such tests?
@KeysightLabs
4 жыл бұрын
It's very capable, but I'd recommend checking specs or giving us a call to make sure it works for your specific use case.
@NukeDMAn
4 жыл бұрын
@@KeysightLabs Thanks for the answer. I tried to find any speed-related specs in the datasheet, couldn't find anything.
4:53 i dont get it u are saying that u just change amps and then say that output changed 100mv i think i gotta be 100mA or i am wrong? Can anybody help me?
@KeysightLabs
4 жыл бұрын
So, what's happening is we're driving different current from the load, and then seeing how it impacts the voltage output. Ideally, the voltage would be completely DC under any load changes, but in real life the output changes (like we see at 4:53 )
That's a pretty sweet tester, I have to say.
Idle-crank-engine started-alternator charge so it boost to 30 than regulated by the alternator regulator to 28v.
How can I contact you?!
@KeysightLabs
4 жыл бұрын
You can email us at wave [at] keysight.com
Nice
@KeysightLabs
4 жыл бұрын
I like that you always leave a nice comment
@CABohol
4 жыл бұрын
@@KeysightLabs I always love to see your video's, very impormative... I hope i can win some of the measurement tools like DSO,.. Because I'm only using vintage analog oscilloscope of my repairs hehe... kzread.info/dash/bejne/dqOIq8WidKnQqLw.html
Darn this machine is good. Pair it with a low frequency VNA and you can work miracles :-)
Maybe tomorrow.... I really need an oscilloscope for my hobby projects :D
Congrates for the winners, I hope I could win this year, but I am not a lucky person, I guess
Hi, Keysight. I am in a need of a good DMM and oscilloscope right now. Can I be the winner of 12th March DMM or oscilloscope because I can't really afford it. Thank you.
jeez, winning one of the funky machines would mean for me to study for 3 months alone the manual to even understand what you can all do with it \o/
WOW I won!
0:38 😀😀
so at the end it was I-See?? maybe that was your Key - Sight eye..... Ok I'll keep my day job.
Please draw my name in the next drawing. I urgently need an oscilloscope, a multimeter will do as well.
@0x07AF
2 жыл бұрын
Yes! BLACK Arracknet needs a sweet new O-scope! Don't leave him out!!
does entering each day increase your odds of winning?
@KeysightLabs
4 жыл бұрын
It gives you an extra entry, and all entries are included in all drawings, so yes!
Frogger is my best arcade game. Wait, i'm supposed to be learning about dc-dc voltage monitoring
Les haré las Review que necesiten, quiero un osciloscopio pata investigación en consolas de vídeojuegos.
where is the Nixie Tube
Try stress testing one of those chean buck-boost converters, see if they catch on fire! I am still optimistic about the giveaway! (I don't see any foreigners winning, so I think no prize for me, ever :P)
@KeysightLabs
4 жыл бұрын
I have thought about that, one of the boost converters I have has a bit of a nebulous "max current" spec.
@bobi_lopataru
4 жыл бұрын
@@KeysightLabs Well even if that high "max current" spec is real you should try overloading them, just to see if they blow up or something! It would be really interesting to see what will happen!
4
I want a Keysight ruler.
@KeysightLabs
4 жыл бұрын
I accept your nomination to be king.
I would do bad things for a keysight network analyzer
You should have measured the AC ripple from an alternator if you were testing automotive buck converters
Joke = Seyenwave - BTW nice Ruler... again.
Lets check all that on $20K scope ) Make everything harder for normal engineers
So is that how an imobalizer work's? The currents path has been cut down to trip the cut off? Wrong combination 🤔
Aaaaaaaah! I want a good oscilloscope so much! But since I do mostly analog audio things I don't really need anything good, so I have no reason to buy it!
@KeysightLabs
4 жыл бұрын
You don't need a GOOD reason, Lennart
@RegebroRepairs
4 жыл бұрын
@@KeysightLabs Good point.
I will get one someday... One day I'll get something that's not a cheap Chinese scope
Ciao, ci vediamo domani, bye
Or in the words of Aunt Clara (Marion Lorne) Hark Ye, hark Ye - Ye witches who live in lamps, Ye powers of watts, and ohmps, and amps, Wizards of AC/DC transmission, Send to me, an electrician!
Are we all counting? 5?
I want keysight equipment really bad, but I can't justify such a large purchase "for hobby use". Guess the 30 yr old tecktronic analog CRT oscope will have to do.
3rd i guess
I wish someone would congratulate me for winning SOMEDAY??? Or not BUT congratulations winners!!!!!
@KeysightLabs
4 жыл бұрын
Congratulations for winning! Not sure if you won, but at least you get the congratulations...
@markgreco1962
4 жыл бұрын
Keysight Labs no not yet!!!!! but appreciate the like. SOMEDAY MY TURN WILL COME.
2nd
7:06 winners
No luck..
How can I trust a company that spells the word view vue? This is javascript frontend developer level (not a compliment)
They really hate the DC-DC buck/boost converter don’t they lols
@KeysightLabs
4 жыл бұрын
Haha, we often just use what we have on hand.
1st
:(
Hear I sit all broken hearten. Hoped I would win but only farten.
@KeysightLabs
4 жыл бұрын
wow such poetry
What do you call a large eye? .....A magnif-eye. 😬
I never win :(
@KeysightLabs
4 жыл бұрын
You're a winner in my book! Like, me personally, not the Wave book (yet) :(
@supernova86
4 жыл бұрын
@@KeysightLabs Well let's hope I get to be a winner in the Wave book today or tmw :D
🥺😭give me that 200MHz of Scope,i really need that.. Since I have registered myself on keysight website..
Hard to sign up when you don't have a job. Can't answer all the questions on the entry form. I guess it's for the pro's only. If I'm retired, I'm not in any industry. I'm just a hobbyist.
@KeysightLabs
4 жыл бұрын
You can put "none" or "N/A" and you'll be fine
@ed-jf3xh
4 жыл бұрын
@@KeysightLabs Yes, I can put N/A for job but all the questions at the bottom require an input from a small list of options that only apply to someone who is working.
I didn't win the Oscilloscope 😭. In Wave 2019 i didn't win In Wave 2020 also didn't win Nice prank😠 Congrats, great joke
Ah, some good quality content. I really like the previous videos, so informative and well edited. Sadly i cant afford such high end equipment cause im a cheapo hobbyist :D
where is the Nixie Tube
@KeysightLabs
4 жыл бұрын
I'm waiting anxiously for it to arrive!
@theusedbox
4 жыл бұрын
@@KeysightLabs Best looking tube I've ever seen.