Learn the Basics of a 3 Phase Rectifier
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- เผยแพร่เมื่อ 23 พ.ย. 2022
- In this video, we're going to learn the basics of a 3 Phase Rectifier. This rectifier is used in power supplies and can be a major part of your electrical engineering education.
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Thank you for your hard work in making these videos. God bless you.
I’m just angry I had to learn this 30 years ago from a frustrated professor pointing at non-animated circuit diagram saying, “see it’s goes like this, then like this, then like that. Everyone understand? Good. Moving on.” This explanation along with the animation is fantastic.
There was one MFG I represented that didn't know how his own VFD worked. The inventor died soon after it hit the marker. Graham Transmissions could make them, but they didn't understand them.
I had similar experience. Less the angry prof.
I am grateful that you take the time to thoroughly illustrate and explain electrical concepts. It has helped me be a better Electrical Engineer. Also this is great study material for the PE Power Exam. Thank you for being a great teacher!
My brother-in-law snagged a solid state three-phase inverter for use on his Bridgeport vertical mill, I helped install it and got to run it for some simple jobs. Works >really< well, especially the variable frequency output, and replaced a clunky old rotary converter that generated a pseudo three phase. I like that a full-wave three phase rectifier generates a ripple that's three times higher in frequency and thus makes filtering a lot more effective (not that I'll ever convert my amplifiers to three phase, but...). Your explanation of the switching action clarifies the complexity of the action that makes three phase so elegant in use.
I was once inside a 100,000A, 100Vdc, the bus bars inside were liquid cooled and the main bus bar was 2mx2m of pure aluminum, that weighed about one tonne for every 3m length. Input was 300,000V AC 3 phase.
Thank you. I have wired many VFDs over the years and knew what they did but not how. When I started over 30 years ago there was a DC motors still around. First one I saw was very odd. 2 small wires and 2 large wires.
At that time, 4 wire DC motors were very common. They had 2 wires for the armature, and 2 for the field winding.
Apply a fixed DC voltage to the field winding to create the circular magnetic field and then apply a fixed or variable DC voltage to the commutator on the armature to get the armature to rotate. Reversing the polarity of either the field current or the aramature current will reverse the direction of the motor
Thank you for always showing us the right way with your attention to detail. 👍
Having never given any thought to this, I honestly had no idea you could put a rectifier across 400v.
Well explained, good video, love the graphics.
You can put a rectifier across 4160V.
If you ever want to home school your kids this would be a great way to unlock there "engineering mindset" luv these vids
Great visual description of this topic. Thamks
Thank you for sharing and knowledge 🙏👍..
Thanks for this.
Thank you for this explanation.
Excellent explanation! Helped a lot.
This was a great video thanks!
Thank you. Great information 👍.
Well done, thank you
Great work Thank you
Nothing explains better than a good animation.
Thx a million ❤️
Great video, and excellently done very informative, a motorcycle I'm working on the stator has this setup to convert ac to smooth flow of dc.
Nice!
Some ideas for next videos:
- Precharge circuit
- More detailed PWM 6x control
- Fireboard and criticallity of preventing DC short on inverter side
Clear explanation Tnx
Nice 🏆🏆🏆
Very good
Thanks!
Thank you, Chris
This video is solid proof of how much time you can waste in a standard university lecture about rectifier circuits.
Can you put an inductor and/or capacitor on the output, to make it less choppy and more sine-like?
Thanks I bought a motor recently with 3 wires and the controller board is delayed - I think with this I can build a custom controller board for testing while I wait thank you!
Fantastic
Please do videos on Thyristor based Rectifiers
2:28 I think the capacitor (negative stripe down) is wired backwards to the rectifying diodes (negative stipe up).
The lower path is the return to the supply, after the load. Therefore it is negative so the capacitor is correct
Is there any chance you could do a video on harmonics?
Nice job I also have a tech question that seems perfect for this video. I have a ceiling fan with three different speeds plus reverse switch six lights that are with ballast, replaced bulbs, worked for a few seconds fluorescent bulbs with rectifiers connected to a switch with a dimmer slide on it. It is also over 20 years old fire covered in dust and cigarette tar and nicotine could use an assist power on no light no fan in power switch on no blown fire circuit breaker
In a while and I’m actually recovering from my black Friday, shopping brain surgery a year ago. Thank you for your time.
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I always wondered why a three phase motor doesn't need a neutral. Now I know why . Thank you
Seen our new 3 phase transformer video?➡️: th-cam.com/video/u0SsejDCVkU/w-d-xo.html
A student from India ❤️
So the AC voltage that is getting rectified by the diode is the line voltage (difference between two phase voltages) in this 3 phase setup? Is this how automotive alternators work? 3 phases connected to a star (wye) setup, because the circuit diagrams look really similar.
Those switches are they GTO thyristors?
What is an IGBT?? Every time I have ever played with these things there was 3 groups of SCRs (silicone controlled rectifiers).
Isolated Gate Bipolar Transistor. Cheaper and you don't need reverse or zero current to turn them off.
@@CrotalusHH if you say so.
PWM is the method of approximating the output sine wave today. Why? It's the cheapest of course. It did require the upgrading of motor winding insulation. Early PWM VFDs would punch through motor insulation so Toshiba wouldn't warranty replace a motor even if it was run on a Toshiba VFD. Almost all motors are VFD rated today. Earlier VFD designs used a variable DC Buss voltage that was regulated by SCR's or some sort of Buss Chopper instead of PWM. Some used Capacitor Banks to store the energy, others used Inductors. Variable Buss Inductor VFDs had a lot more iron in them and as a result were much more robust. I spent over 40 years starting up and repairing VFD's from every MFG you can name from fractional horsepower to 3000Hp, 230VAC to 4160VAC.
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Ok 2 questions.
1. How can I have an inverter that takes in 120v and out puts out up 240v? I have a few of these lying around they are all small (
For 1, if it is single phase then to get 240v all you need is 120v to ground. 120v rectified will give you enough voltage to make a 0-240v on the positive side, then you flip the direction for the negative side.
For 2, the difference is between the last two segments of the video. A square wave just turns on and off once per cycle, but a sine wave turns on and off constantly to hit voltage targets. The difference is the voltage detectors + control to turn the transistors on/off very fast + transistors you can actually do it with (maybe).
1. if it's two** phase ac then you only need to conect one phase to the load and other to neutral. if it's single phase use an appropriate transformer.
2. an RC occilator, really. if you want to get fancy, you can try and reprogram the microcontroller (or replace it) to output spwm, and a RC filter on the output. botu ways would require you to reprogram or replace the micocontroller though, and would need an ociloscope to make sure you don't fry anything.
Car battery chargers contain inbuilt module with full protection, diodes separately fail depending on the bad batteries. These parts are cheap, probably ic modules also exist for this purpose with protection.
And?
@@joeds3775 MONEH MINE!!! MONEH MINE!!!
Did you know that if you use 'six wire' from the output coils and 12 diodes you can receive both plus and minus with a common point.
You can also reverse the firing order of the output and have the motor stop then run in reverse.
3 phase to dc. The dc voltage is?
Isn't the first part of the explanation incorrect? between the 2 and 3 "sections" both phase 1 and phase 2 are positive but 3 is fully negative, so the flow should be from both 1 and 2 to 3. Same thing happens in reverse a few times. Phases are "off" for a single instant, it shouldn't even be visible.
The rectifier is only half wave.
Damn, took me 3 years to fully understand it using boring B&W textbook, and 6 minutes with this animated switch.
guess i'm just too much a visual person then.
Thanks for an informative and enjoyable video.
I would like you to make one change to your narrative in future videos because of my experiences as a prison teacher. You use "guys" to refer to people, but guys can also be used in a restrictive sense to refer to just males. Worse, in some cultures and situations, the use of the term can be encouragement for some men to prevent women from accessing videos about technical subjects. I have experienced this happen in relatively enlightened Norway. Think of what happens in less enlightened places, such as Iran. So I would like to encourage you to substitute "people" for "guys", to make the world a more accessible place for everyone.
Once again, I found the video relevant and to the point.
Uh oh. Don’t know what an IGBT is? Always define your initialisms then you first introduce them 🫣🤓 I’m guessing I missed a few videos.
IGBT stands for insulated-gate bipolar transistor. It is a bipolar transistor with an insulated gate terminal. The IGBT combines, in a single device, a control input with a MOS structure and a bipolar power transistor that acts as an output switch. IGBTs are suitable for high-voltage, high-current applications.
But where is 3 phase Stepdown transformer
What a crap way it was taught at Uni, Uni was totally crap, always self learned in the field by doing and when teaching again by doing , and using great simulators.
This is a great presentation, everything in less than 7 minutes
Why the arbitrary numbers then? Why did you call the second diode a current flows through as diode 6? Why not diode 2? The numbering made ZERO sense to me.
Too much for me to learn this shit. I just do regular house wiring like lights and plugs and switches.
I wonder if you are qualified for that then...
I feel you could decrease the speed of your explanation. I could not correlate the electron flow with phases. Please make this into a 2-3 videos. I m not am elec engr. Thank you.
Please use the speed controls in the video settings. I'd also encourage you to pause the video, rewind and make notes to absorb the info
great video! a capacitor acts much lie a shock absorber, so to speak
Well put!!!! How do they input single phase 220 and output 220 3 phase? On some frequency drives. I'm assuming just like split phase incoming current on the poles.
With a VFD, variable frequency device.
They have some kind of boost converter inside to boost the rectified 220 high enough and a big capacitor bank to stabilise the DC stage.
It works exactly the same as when imputing 3 phase just not using the last set of diodes. If you wire single phase into a standard 3 phase vdf you will still get dc power to the capacitors. You at just using part of the rectifier. So oversize your vfd so that the diodes do not exceed the capacity of the rectifier diodes.