How PFC works pt2 with Texas Instruments UCC28180
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- čas přidán 26. 07. 2024
- This video is a part 2, and in this video I show How a PFC Works using an eval board from Texas Instruments which is the UCC28180EVM. I'll review discuss the benefits of a PFC and how it works, and then I'll show some waveforms. #PFC #UCC28180 #howPFCworks #PFCconverter
How a PFC converter Works with Texas Instruments UCC28180 • How a PFC converter Wo...
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Great explanation of power and phase, I hadn't thought of it like that before but it's obvious when you say it! All that buzzing and popping was exciting: I was expecting something to burst into flames any second.
Sorry about the buzzing;) I think my mic cord was running across the power. Thank you!
LOL - no problem. It was like walking past an electricity sub station with it humming away and thinking that those signs stating “Danger of Death” are not wrong!! I’m kind of disappointed it was only the microphone cord now :)
LOL - I should have left it a mystery;)
Very well explained and it helps me a lot. Thanks a lot!
Thank you - I appreciate you!
Another informative video.. Great job.. Thank you!!!
Thank you - I appreciate you!
GREAT VIDEO THANK YOU
Thank you! I appreciate you!
Nice video, with scope :) I just learning about UC3854 with my scope and light bulbs :)
Thanks Jerek! It sounds like you are doing great if you know about the UC3854;) Let me know if you have any questions, or video ideas.
Great job, keep up the good work. If possible, try to have a script, will speed up filming and editing.
Thank you - and thanks for the feedback!
Thanks, Eddie.
You bet Robert! Good to hear from you!
You bet and thank you!
Okay, this video is awesome
Thank you!
I have an explanation why 390V is... PFC originally voltage boost conversion, because sine also has 0, 1v, 2v etc... This means that the output voltage should be higher than the maximum input voltage. And I don't think they produce this separately for each country... So in europe we have 230*sqrt(2)=325v and theoretically some voltage jumps can occur... So 390v seems to be reasonable with a bit of supply, otherwise it should of course be as low as possible...
390v we can actually connect to any european pulse power supply. What do you do in the USA with these 390v????
Thanks for the input! Yes, the PFC is typically designed for what is referred to as the Universal Input. The input for this would be around 85V to 264Vac. This way it can work in most places in the world - automatically. I have other videos on this PFC showing how to design one - and going thru many design considerations. Look for my PFC Playlist: czcams.com/play/PLZ0_iMoMBSskr40yhHfp9a9yarXG44Rd0.html
In my opinion, you described the operation of the additional diode (bypass) incorrectly. Its purpose is not to protect against the saturation of the inductor because, during the charging of the output capacitor, upon startup, the inductor can saturate, which will not adversely affect the operation of the circuit. It is an additional diode that can withstand significantly higher current impulses (but has worse switching properties) than the one from the actual circuit. If we did not utilize this diode, the one from the PFC would be damaged when the circuit is activated.
Thanks for your feedback. I didn’t mean to describe the second diode that way - and your description is a curate either. I thought I explained that it was there to help the cap charge - essentially taking the burden off the boost diode and FET. I think I need to do a quick video on this topic. Sorry for the confusion.
Thanks for such a great video ! I would like to well understand how could you start the PFC board. Did you first apply 12V VCC supply, then energize the board via AC? Thanks in advance !
Thank you for your feedback! Yes, I applied the 12V first;)
Hi Eddie, I really like your teaching method. I Can’t wait for the next video. How do you become a CZcams friend?
Awesome! Thank you!
9:00 I think you are wrong. PFC already with 1V input voltage will shoot up to 390V, so the diode has no chance to help at start. The circuit has the possibility to switch off the pfc, then everything runs through this diode. (on your sketch is not visible but on others there is pfc_ON signal)
Thanks for your input - but that diode is used to help fill the caps during start up. If you have designed and tested one of these - it would be obvious. The boost can not boost 1V to 390V - and if it could - it would be limited in how much energy so as not to blow up the switching FET.
You are correct, as with any boost converter, if it stops running the output will continue to be charged with the input voltage.
@@KissAnalog But even if the energy is limited and the first pulses cannot charge the capacitor to 390v, then the curve is faster/higher than that of the input signal anyway, so the diode may only have the chanсe until PCB starts.
If you have free time, perhaps you could also try to capture this starting current through the diode at startup during your next test?
Great Video😍!! Can we use the circuit for CC CV regulation in a charger? Can you help with this
Thank you! These do operate in CV mode and if loaded down go into CC mode. If you tell me what input voltage that you have and what voltage you want to charge I can give you better advice.
Hey Eddie. Love the channel!!! This is the channel I’ve been looking for. I got kind of a stupid question. I understand you need an auxiliary supply in order to power the chip for the evaluation board. When designing a circuit though, how would you get the 14 volts or so that the chip needs? Could you just run a voltage divider and regulator after the rectifier and filter caps?
Thanks Paul glad to have you! You could creat that aux voltage by using a half wave rectifier off the input so there’s less energy to.drop when it is regulated down. A switcher could be used as well. At times a house keeping voltage might be created for this voltage and might be needed to run some other circuitry. I’ll go over another PFC and talk more about this. Keep asking questions:)
That would be great if you could cover that a little more. I’ve been learning a lot over on ti.com. They have a lot of great resources over there. There’s a personal project/prototype I’m starting to work on that needs PFC boost 400v dc bus, 15v for pwm ic and isolated gate drivers, 3.3v rail for MCU. And 1.8 reference voltage. It can start getting big real quick. So if you could go over how you would approach multiple rails, I’d appreciate it!!!
Also, for some reason I can’t seem to wrap my head around bode plots. I know what they are and I know what they’re used for. But I just can’t seem to figure out the relationship with the graph and gain, phase, bandwidth, crossover frequency, etc. I know you did some videos on it already. It still doesn’t make sense to me. I would appreciate more knowledge about that too. Thanks!!!
You can add small winding to choke and use it as transformer but you also need give some startup energy via high power high resistance resistors.
Thank you for this effort can I ucc28180 for 5kW output I managed in this circuit to get an output of almost 1 amp can u28180 output 15 amps or should we use another component and is it for me to know what it is?
Thank you! The UCC28180 can do higher power, but you will need to use parallel FETs and/or a big one;) This will likely mean that you will need to use a gate driver to drive more gate power;) Another option that will likely work better for more power is this TI chip in this video: czcams.com/video/geZzxXTwHK0/video.html
well, ThANK YOU, for a very good explanation, and that chip is a piece of art, however, I would like to know the output dc voltage and current waveforms, are they good DC signals? can the output be used to feed the spwm sine wave inverter H-bridge MOSFETs? I have designed the inverter and, I was looking for a fair 300Vish power supply.
Thanks for the question John! The PFC takes an AC input and makes DC output. It sounds like you are making an Inverter - so DC to AC. Taking the DC from this would be going full circle - so I'm not sure that's what you want. Unless, you are going from some different AC and converting it to another AC output. What input power do you want to use for your inverter - and maybe I can help better?
@@KissAnalog Thank you for your concern and reply, I want to have a 300vish dc and around 0.7A as the input to my inverter so I can be able to convert DC to AC again, this is my primary goal.
@@KissAnalog if i understand correctly, you mean the dc output from this is half sine waves dc?? like the signal coming out of the bridge rectifier?
@@KissAnalog I would appreciate your help and advice, haha. I'm trying to control the frequency on my inverter, so I thought using a step-up transformer may not be a good way to go? because they work well at rated frequencies?
Thanks for asking John! Tell me what input and output you have? If I know what your input is and what your output is - then I can help much more.
Where this noise comes from? I think switching frequency is 100KHz so way much higher than audible band then where it is from?
Yes, the noise is at a high frequency, so above the hearing range. Also, more filtering down-steam should help clean things up even more.
@@KissAnalog but I am still hearing noise on your demo. I am not sure why.
Great question! I'll have to work with this PFC again and see what comes up;)
Can you test a device like that with a arbitrary function generator?
Possibly but you couldn’t use too much of a load. What are your thoughts?
I wrote this without knowing that you have to have so much load Eddie
LOL I’m glad you keep in touch - always good feedback!
Corona screen 😀
LOL
Its not very good output maybe a good power factor , but a whole lot of noise , Maybe it’s having a lot Signals at higher frequency Not something wich I like to have between my radio equipment and powerline
Bert, the actual output does look better...
Eddy you get a email from me with a picture of Harmonics on the power lines in hous
Wow, that doesn’t look to bad - right?
HI. HELP ME, PLEASE.
Я НЕ ВСЁ ПОНИМАЮ В ИНОСТРАННЫХ СХЕМАХ, ЧТО ОЗНАЧАЕТ В СХЕМЕ 3.5-kW PFC (TIDA-00779) И ОТКУДА ОНИ ИДУТ И КУДА ИХ СОЕДИНЯТЬ: 5-PFC_ON, 6-ACsense, RTN ? translation
I DON'T UNDERSTAND EVERYTHING IN FOREIGN SCHEMES, WHAT DOES 3.5-kW PFC (TIDA-00779) MEAN IN THE SCHEME AND WHERE DO THEY COME FROM AND WHERE TO CONNECT THEM: 5-PFC_ON, 6-ACsense, RTN ?
Thanks for the question. I'll try to do a video to answer this OK? Let me know if the next video on this TIDA answers your question.
НЕ НАДО СНИМАТЬ ВИДЕО РАДИ ЭТИХ ТРЁХ ОБОЗНАЧЕНИЙ. ВОПРОС ОЧЕНЬ ПРОСТОЙ ЖЕ. ИЛИ СЛОЖНЫЙ ? ОТВЕТЬТЕ ЕСЛИ ЗНАЕТЕ И ВСЁ, СЭР. Я ВСЁ-РАВНО НЕ ПОНИМАЮ ДЛИННОГО ВИДЕО НА АНГЛИЙСКОМ.
NO NEED TO SHOOT A VIDEO FOR THE SAKE OF THESE THREE DESIGNATIONS. THE QUESTION IS VERY SIMPLE. OR COMPLICATED ? ANSWER QUICKLY IF YOU KNOW AND THAT'S IT, SIR. I STILL DON'T UNDERSTAND THE LONG VIDEO IN ENGLISH
@@KissAnalog
мне кажется значки типа заземления верхногами с одинаковым текстом между собой надо соединять.... в случае с rtn нисчем так как это слово во всей ПДФке не встречается... А вообще так если подумать, ты же не собрался купить эти 2 микросхеми и собрать схему самостоятельно? А если купишь всю плату то там и так уже всё где надо соединено. pfc_on = BIAS включено, pfc_on = 0v выключено, в принципе кнопкой на схеме переключается но можно конечно на разьем подать если кнопка не влючена, а если она включена и подать 0 на разьем будет бум ;)
@@xelth Я УЖЕ ЗАБРОСИЛ ЭТО ДЕЛО, ТАК КАК В СВОЁ ВРЕМЯ НЕ СМОГ РЕШИТЬ. КОРОЧЕ, ПОЗДНО УЖЕ