What is a TRIAC? How TRIACs Work? ( Triode for Alternating Current - TRIAC Tutorial)
Вставка
- Опубліковано 8 лип 2024
- In this video, I will basically explain the working principle of TRIAC. It used in home lighting, dimmer circuits, speed control circuits of fan motors and many power control systems including electronic switches which is one of the power electronic circuit elements. TRIAC is an improved version of the thyristor. While the thyristor can control large currents by operating in a single positive or negative alternator in AC, TRIAC can control large currents in both alternances of the AC waveform. In other words, while Thyristor is mostly used for DC power applications, we can say that TRIAC is more suitable for use in AC power applications.
The abbreviation TRIAC comes from the initials of the English words Triode for Alternating Current. It is understood from its English name that this three-pin power electronics circuit element is used in alternating current.
---------------------------------------------------------------------------------------------------------------
You can access more content by enrolling up for our Udemy course from the link below 👇
www.udemy.com/course/basic-el...
---------------------------------------------------------------------------------------------------------------
If you like our content, support us for better 🤗:
☕ Buy Me a Coffee: www.buymeacoffee.com/eeapplic...
🚀 Support with Patreon: / eapplications
#triac #power #electronics
I used to build sound to light units using triacs. The lights flashed with the music beat like in a disco. Very popular in the 70’s.
Ah right. Triacs made of flint and bear-skins :)
many thanks for full TRIACs engineering , purpose and apps ! good day n night .
Thank you for quick and clear explanation. Subscribed! 😀
I had forgotten about TRIACS. I could remember about the trigger current to turn them on. I forgot how to turn them off by taking away trigger current to turn them off at the next current zero. Thanks. Good graphics.
thank you. Now I could understand the working of Triac.
Excellent summary!
Thank you so much 😊🙏
Thanks a lot
Thank you for TRIAC understanding lesson 👍
Thank you so much 😊🙏
Thank you
...Respect..thank you
NIce explanation!
THANK YOU SIR. YOU ARE EXPLAIN VERY WELL AND SIMPLE LANGUAGE.
Thank you very much 😊
'🎉😮Good of examples!❤
Thank you so much ☺️
Well explained, go on!
Thank you very much 😊🙏
wow!
thank you varry mach for TRIAC understanding lesson 👍👍👍
Thank you so much ☺️🙏
Howdy again.
I my teens I built a light organ using triacs. Three triacs for three output sockets, bass, medium and treble. It worked after some improvements. The problem with the original circuit was ghost triggering. When the bass channel was triggered the other channels got ghost triggered as well. The likely reason was that spikes propagated all over the circuitry. And the reason for that was probably the mains CLC filter blocking the spikes from going backwards to the grid.
Clearly the gate is highly sensitive. I reduced the resistor values to 1/10 of the schematic values and increased the capacitors to 10 times in the phase shifting trigger circuits. Also I connected a 1 k resistor between the gate and MT1 to short out any ghost pulses.
Ghost triggering will also happen if the voltage over MT1 and MT2 rises too fast. = du/dt is too large. This may be managed by connecting a plastic capacitor over MT2 to MT2. Try 100 nF first. Increase value until ghost triggering goes away. Or decrease value until ghost triggering comes back.
Regards again.
Thank you so much ☺️🙏
Good practical explanation☺
Thank you so much ☺️
Perfectly clear, thanks.
Good job
Thank you so much ☺️🙏
It isn't perfectly clear, it's wrong.
Only clear because you don't have the knowledge to know it is wrong, so you believe what you have been told.
Creative video, thanks :)
Thank you very much ☺️
Dimmer seich controlling swich some par potactveting triac restaters par electrines pared
Howdy.
Just a comment that may be of interest.
One can trigger a triac either with a positive pulse on the gate with reference to A1 (cathode) or by a negative pulse. The triggering needs not be of the same polarity as is the A2 (anode).
Seldom told. But I have established by testing.
Regards.
So nice
Thank you 😊
Why is it in analog tester the diode with stripe is negative and the other side of diode is positive. My question when connected to power supply is it correct to follow the polarity. If yes diode will burn. So what I did the stripe I connect to the ac secondary of transformer and the diode is Okey.
Please explain.
Thank you
interesting
Thankyousir
Thank you very much for your interest 😊
When I was 14 about 40 years ago, I wanted to make a light dimmer and the electronics lab insisted I use a microcontroller and triac circuit so I would learn more. I learned. As an adult I just buy finished devices and don't prototype unnecessarily complex circuits.
I repair those circuits, mainly. Occasionally, I will design and construct a circuit if it's unavailable.
Howdy. Nice.
I did some testing a long time ago to see if I can trigger the triac both with positive and negative gate potential to MT1. It worked. The polarity on the gate needs not be the same as on the MT2 to trigger.
Regards.
Hi. I am so glad you liked the video. Also, thank you for the information you provided 🙏👍
The AC circuit in the video thumbnail might destroy your triac .... the load ( a lamp here ) should be connected between top ( line or live ) and the MT2 ( NOT on MT1 side , which connects direct to mains neutral ! ) the push button and resistor ( usually about 330 Ω ) connects between the GATE and MT2 .. NEVER , NEVER connect to line side of lamp ( BIG BANG , dead triac ! ) ...when the triac turns ON the voltage at MT2 drops to a very small value , thus not overloading the push button / resistor / or GATE ... you can even use a tiny reed switch to turn on hundreds of amps load ( use a BIG triac ! ) .... ( tried - n - tested ) ........... DAVE™ .............
Thank you for the additional information.
Thanks for a very clear explanation
wow
Is it compulsory to apply voltages from a different source to the gate?
No
How does it work?
Please can you use a Thyristor in an AC circuit???
Are MT1 and MT2 interchangable since its AC? or MT1 has always to be N and MT2 has always to be Load?
Can be used interchangeably as it is AC 👍🏻
Is it possible for triac become short circuit? I got my triac always ON even without any trigger to gate.
Without voltage over 3-5 Volts applied to the Gate triac shouldn't been open in any direction. Your part is highly likely damaged :-(
Of course, you shoudn't apply to triac terminals overrated voltage - it do break part forever also.
I replaced a drain pump with a higher powered drain pump and the triac shorted due to exceeding it's maximum current rating and the pump ran continuously
2:45 I don't quite understand how the DC current flow works here if you're basically connecting AC and DC systems directly together
I wondered about that too. The DC gate circuit could only conduct during the positive half of the AC cycle. I think a full bridge rectifier would help.
Why is battery negative is connected to the AC source via the lamp?
Hello. Normally this connection is not suitable. I already said that towards the end of the video. I showed it like this because I thought it would be more appropriate to explain the working principle in this way.
Ya, that confused me too!
At minute 3.55-4.10, the resistor how many ohms, watts?
i think is 220 ohm my friend but you gotta look to datasheet of triac because its gate voltage can change soryy for answering late
2:46 - I never understood the safety and theory that the negative terminal of the battery could be connected directly to the AC main line. Can you explain how this is possible, is it safe? Thanks
well the AC cannot go through the gate of the triac so the battery is connected to the AC by only the negative terminal. So the AC has no path to go to the battery. Thats why it won't toast the battery. But if you touch the negative terminal of the battery and you are not properly isolated from the floor (ground) it will kick you. Thats why you should always use optocouplers. Also if the AC voltage will go above maximum rating of the triac (500-800V) it can break through the gate and then it will blow up the battery. This can happen with inductive loads. Optocouplers have isolation several kV so it is much more safe.
What happens if we short mt1 and mt2? Will it destroy the triac? Thanks.
Normally nothing happens - you just shunt current outside of triac chrystal.
🙏🌹
Wouldn't DC on the trigger in an AC circuit just make it conduct for half the cycle?
I'm assuming because the DC is constantly shorting the parallel thyristor it allows the current flow.
The triac will trigger with DC but not symetrically.
*Bro please u can describe in a vedio*
*Why we connect resisstor at the base of transistors and how do we calculate the base resistor 😯😯😯*
The purpose of the resistor is to limit gate current. Select your resistor based on the gate current specification from your triac datasheet and the system voltage.
R=E/I, right?
In a transistor, there are limits to the Base current to turn them on or off. The minimum current will turn them ON, but may not drive them to saturation ( EC current for minimum Vce.) But more than the minimum current will create excess heat. Above the max. Ib (base current) the transistor can be damaged or destroyed by heat from power dissipation. Similarly, Gate current for a Thyristor ( SCR) has limits.
Can we replace Gate to M¹
Unfortunately
What's the difference between transistor and triac???
The transistor is used in small power DC applications while the TRIAC is used in large power AC power electronics applications. Basically we can tell this difference.
@@eeapplications thanks!
What determines if this is used instead of a potentiometer? Seems like they both have the same purpose but the triac would consumer more power if it requires an additional power source.
A lot less power. Triacs are used for 'phase chopping' - turning on mid-way through the cycle, allowing for a simple but effective form of PWM power control. It's way more efficient than a potentiometer, which just adds resistance and wastes a ton of power as heat.
Downside is you get nasty harmonics, so EMI issues - even a household dimmer switch can emit enough radio noise to hear on an AM radio.
✔ All videos take a long time to make. If you want to buy our coffee to thank you, click the link below or the thanks button 🤗
Support with Patreon: www.patreon.com/eapplications
Where is your Diac?
Watch to the end!
not needed in those circuits. function of a diac is to block current from a variably-charged capacitor until it reaches a set level. Optocoupler circuit shown is not a dimmer, just shows on and off. It works fine w/ just an optocoupler.
i doubt in this connections
Please bangla
Saying thyristers are for dc is bonkers.
If you turn it on, then with dc it will remain on even if you remove or gnd the gate.
Thyristers have a hold on current.
When used on ac a thyrister will only conduct on the positive half cycle but ot Will turn off each time the sin wave is almost 0v.
沒有台灣中文與語法異常
So many words for so little said.
I think it is useful for those who are just starting to learn circuit elements. There are many switching elements similar to transistors. Many friends have a hard time distinguishing them.
@@eeapplications It's important to illustrate and exhibit a practical circuit from the beginning! Don't leave the beginners to fiddle around with mains and triacs without pointing out the correct connection of M2 and M1, which connects to the load and which to Neutral!
@Khaled Yousef Hi. I agree with you. But I'm here too In the video, I tried to show only the basic working logic of this circuit element. I have not given any examples of voltage levels here. Thank you.
Alternances?
Who talks like that? Don't try to impress, try to communicate with your audiences.
Both directions
Both halve of the wave form?
A thesaurus is a fine tool, but reading a dictionary to people turns them off in a hurry
Quote: _"Who talks like that?"_
Content creators with large subscriber lists.
Thank you
Thank you