All You Need To Know About PFC To Fix Stuff : Power Factor Correction For Beginners

Рет қаралды 7,473

20 күн бұрын

PFC is used in a lot of Switch Mode Power Supplies and other applications. But what is PFC, What does it do and how does it work? And even more inportant what goes wrong? Learn All You Need To Know About PFC To Fix Stuff Here!
Find the full All You Need To Know Series here
• The ALL YOU NEED TO KN...
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Richard

Пікірлер: 60

@pierretessier1682 18 күн бұрын

Wonderful, you made a real good job for explaining de PFC in simple words, no maths. Thank a lot for your works!

@christopherbullard835 17 күн бұрын

Thanks Richard! You are a very wise young man and a great teacher! Thanks so much for all you do for us.

@Mcfreddo 9 күн бұрын

I did enjoy it, thank you! Your lessons are fantastic.

@garypoplin4599 18 күн бұрын

33:30 - Thanks for adding that in (even if it were just an afterthought!) Before, it was difficult for me to understand how a single power supply could be used on such a wide range of input voltages. Until now, it had been somewhat of a mystery to me. I learn something from you every time I see one of your videos (some times it takes my watching them more than once to get all the nuggets out of them)!

@chrishartley1210 19 күн бұрын

I think you have it backwards about the way power companies apply charges. Standard meters measure watts. The new smart meters are capable of measuring both VA and watts. In a purely inductive or purely capacitative circuit the VA measurement will be bigger (sometimes by many times) than watts measured. The reason why power companies want everyone to have smart meters is so that they can switch the charging method. In some cases the cost can change from a few pennies or cents to several pounds/euros/dollars. At the moment, power companies make up for the difference with a portion of the daily standing charge. Those with PFC devices are effectively being charged twice. If they change the way power is measured the price per VA will be less than the price per watt but will more accurately reflect the energy consumed. That means the daily standing charge should drop but it is unlikely that it will.

@deangriffiths8107 18 күн бұрын

Exactly why I never had and never will have a smart meter fitted.

@LearnElectronicsRepair 18 күн бұрын

That was meant to be a bit tongue in cheek 😅

@jameslineham9761 16 күн бұрын

Great job, Thanks!

@wtfucrazy 15 күн бұрын

Thanks! great work

@enchanter976 18 күн бұрын

Brilliant lesson, I always wanted to learn how these modern power supplies work, Thank you Richard 😊

@rahulmechatronics 17 күн бұрын

Thank you Richard... very nicely explained the concept of PFC 👍👍👍...... greetings from India

@RuneInternational 19 күн бұрын

should it not be just 0.95 or 95%

@LearnElectronicsRepair 18 күн бұрын

Sorry, I mixed that up

@Patecabraltica 18 күн бұрын

Hi, Richard. Thanks for this, it explains nicely how PFC works, which I didn't quite understood until now. And the last 7 minutes or so are GOLD, because you MIGHT make the mistake of trying to measure the main cap voltage in the bridge rectifier, being this such a common practice. I made that mistake once with a minicomponent power supply, and got a shock, fortunately only an annoying, not a deadly one. Made a video of it in my channel as a warning, but I'll better update that and explain that we should "look out for it" when we got an active PFC in our board. 👌

@dougiee6589 16 күн бұрын

I think now how the power cleaning devices I bought off temu actually clean dirty power and saves your power bill. Thank you

@surgingcircuits6955 18 күн бұрын

This is a very important/useful video, answers many questions, and is really appreciated. TY!

@lawrencehalpin6611 19 күн бұрын

Thank you. Kind regards.

@melvilib 18 күн бұрын

Thanks Richard, I knew what and why, but now know how 👍

@Lightrunner. 18 күн бұрын

I love the expression GND🥰.... VSS or VEE are weird names 🤖.

@Dutch_off_grid_homesteading 18 күн бұрын

Heya, very nice explanation of the pfc love it and untherstand it.

@phillipchen7749 18 күн бұрын

nice tutorial on pfc operation

@k3ggaming926 19 күн бұрын

This was same explanation as haseeb and you guys are doing a great video for us who is willing to learn electronics by just watching youtube and apply it on actual board. Thank you guys❤❤❤❤

@LearnElectronicsRepair 18 күн бұрын

That's even more interesting as I haven't seen Haseeb video on this topic

@ser_olmy 19 күн бұрын

Most power companies charge you extra for the maximum current load, and some will charge according to the overall Power Factor of an entire building. There's a good reason for that, which also is a good argument for performing Power Factor Correction. As shown by the first drawing, a component with a PF < 1 will not be able to make full use of the maximum AC voltage. This means that in order to generate a desired amount of power, more peak current has to be drawn (because the maximum current isn't drawn when the voltage is at its highest, and P is still U x I). A device doing this is not actually wasting any power, just drawing more current at a lower voltage to achieve the same result. However, as the diameter of power lines and mains cabling is directly related to current, not voltage, power companies have to install bigger/more lines to supply power to equipment and sites with a lower PFC, even though the overall power drawn might be the same. Since lines = copper + installation, and copper + installation = money, power companies would much prefer it if your PFC is as close to 1 as physically possible. Oh, and this obviously works on a local scale too: You might think that the "I" amp circuit in your house in a country with a mains voltage of "U" should handle a load of I x U Watts, but if the combined PF of the devices you're powering is less than 1, the breaker (which only deals with current) will trip well before you get to the theoretical maximum.

@LearnElectronicsRepair 18 күн бұрын

Thank you so much for your input here, this is a difficult concept to understand or try to explain without using maths that a lot of people would not understand anyway.

@jerrodrollins1509 19 күн бұрын

I really appreciate how you explain things in a way that us "dummies" can understand. Caveman talk

@LearnElectronicsRepair 19 күн бұрын

Thank you 🙂

@warwickbunn1250 19 күн бұрын

He's got a tough job as some of us are particularly... um .... challenged (me) 😆🤣🤣 So I may have to watch this again, and again. But I love all these videos. 👌 Thanks Richard.

@LearnElectronicsRepair 18 күн бұрын

@@warwickbunn1250 If it doesn't make sense let me know what parts are confusing. I do hope that isn't all parts but I do admit this is a hard concept to get your head around

@nasosst3092 18 күн бұрын

Plus one question: there probably is a voltage feeding circuit after the initial start to serve the pfc chip vcc during normal operation. Some info about this plus a simple schematic would be interesting

@barryjensen296 17 күн бұрын

I think you have it wrong. VA is always >= Watts. Electric companies generally charge for Watts. But can charge for "demand", maximum VA. This is common in industry.

@viniciusvbf22 18 күн бұрын

Hello, Richard! Thank you so much for this lesson. It know it may be way too simple, but, if you can find the time, could you please make a video explaining about current sensor resistors? I'm always lost when thinking about how can a 1 ohm resistor "sense" 10 amps of current (since it will have about 10 watts going through it, I think). Again, thank you for all your videos. I wish I can repay you and so many other youtubers that teached me so much someday or, at the very least, thank you in person and bring you some gifts. Cheers!

@LearnElectronicsRepair 18 күн бұрын

Sure, I'll make a video about this topic

@jeremylaidman6525 18 күн бұрын

It's because the voltage across the resistor increases as the current increases, by Ohm's law. A 1 ohm resistor with 10 amps running through will have 10 volts across it. So the PWM/PFC chip is measuring volts, to know what the current must be.

@nasosst3092 18 күн бұрын

32:00. we can always wash the trousers and get ready for the next BANG dear Rick

@LearnElectronicsRepair 18 күн бұрын

pmsl

@tonysheerness2427 19 күн бұрын

Very educational, learnt something useful. How are the tourists in your part of Spain as in Magaluf the beaches a deserted?

@LearnElectronicsRepair 18 күн бұрын

Quite busy. Though May into June is our low season, July/August and the winter months are much busier

@aliemlek 18 күн бұрын

👌👌👍👍

@markweiss5152 18 күн бұрын

Power Factor Correction. thank you. to get a good understanding of how much deference it makes. The deference in speeds of most ceiling fans is all due to Power Factor Correction. Low speed = no Power Factor Correction. medium speed = some Power Factor Correction. high speed = full Power Factor Correction.

@Monaco-BuilditFixitDriveitEver 18 күн бұрын

Interesting.

@jeremylaidman6525 18 күн бұрын

On active PFC with power source removed, can the residual voltage across the big cap be measured across the diode, given that one side is at cap potential and the other side is at bridge rectifier potential, which is zero?

@user-wt9xo5ys1m 18 күн бұрын

Amazing lesson as usual, but I didn't understand how this circuit got the current wave to be close to voltage wave, I understood it is trying to keep the capacitor 390v all the time but in terms of wave didn't get it, can you please explain a little bit to make it more understandable. Many thanks for your efforts

@LearnElectronicsRepair 18 күн бұрын

It didn't exactly, I used a bit of poetic license to get the principle over. 😇 The switching mosfet will cause very rapid voltage changes in the waveform. But the filters on the input (capacitors, inductors) remove the high frequency switching noise and you then end up with a waveform like the one I showed

@user-hj6df3jf4w 8 күн бұрын

10:40 wonder what the power factor is on this passive Pfc? is it close to 0.8?

@alfordmyers7786 16 күн бұрын

What happened to ELI the ICEman?

@unintendedperson 19 күн бұрын

can we disable pfc when the pfc pwm and smps pwm is single chip?

@LearnElectronicsRepair 18 күн бұрын

Probably not as the PFC controller is monitoring the boost voltage. But no doubt it depends on the chip type

@Lightrunner. 18 күн бұрын

Why would you do this ?

@LearnElectronicsRepair 18 күн бұрын

@@Lightrunner. It's a useful repair technique, if you have for exampe a short circuit PFC mosfet on a 'combined' PFC+ PSU+Load type PCB, for example you could find in a TV, you may want to disable the PFC by removing the shorted Mosfet and see if the rest of the board will power up with say (non-boosted) 320V in the bulk smooting capacitors or if you have other faults too.

@Lightrunner. 18 күн бұрын

@@LearnElectronicsRepair ohhh, sorry. My question had a different background. I hadn't thought about repairing it😪.