Use Dual SCRs as High Power AC Triac

No video

Use Dual SCRs as High Power AC Triac

Рет қаралды 18,306

Lewis Loflin

5 жыл бұрын

Several SCR circuits how to use as Triacs.
www.bristolwatc...

Пікірлер: 40

@Fogaata 5 жыл бұрын

Very much appreciated, clear unhurried, patient explanation. Thank you!!

@guloguloguy 6 ай бұрын

WOW!!! THANK YOU, FOR THIS CLEAR, AND CONCISE LOOK ATE THESE CIRCUITS, AND HOW THEY FUNCTION!

@agstechnicalsupport Жыл бұрын

Very nice video, explains step by step the functioning of the triac circuit.

@Excalibur32 Жыл бұрын

I was wondering why tying the 2 gates together wasn't working in my circuit...thank you so much for the explanation!

@LewisLoflin Жыл бұрын

Welcome

@brunoperezmedellin7000 5 ай бұрын

The component showed in the video and webpage (BT137-600) is a Triac, built the circuit with scrs and it didn't work.

@albertolozada3746 2 жыл бұрын

en tu diagrama dices que los SCR son de referencia BT 137 pero estos elementos no son SCR sino TRIAC

@narindersingh-ht8og 3 жыл бұрын

How I can vary bulb intensity in the circuit you are demonstrating on 5:00 at the video. Can I vary input voltage of optocoupler or duty cycle??

@BasementEngineer Жыл бұрын

Thanks for the schematics; most informative. I have a question and would appreciate an answer if possible. I wish to use your circuit to control a home shop spot welder. This is quite a serious machine and has an inrush current of 70 amperes at 115 VC. I have the power line that supports this safely, as the welding pulses at that power level are typically 1/2 second. So, to handle that inrush current, are 2 SCR with inverse-parallel connection, sufficient with a 150 Ampere rating each, sufficient? Secondly, for triggering, can the optoisolator be directly replaced with a solid state timer? I'd like to use one with say 0 to 10 second on-time. Thank you kindly for your time and patience with this matter.

@otoauto2257 10 ай бұрын

Hi @BasementEngineer! Very nice to see you. How is your matter now? I think TRIAC or SCR all help solves your problem. With spot welder, this is a pure resistive AC power load that you can use my simplest version of my project that is "using mechanical relay to turn on off AC power at zero-cross". You can visit kzfaq.info/get/bejne/j7SqeNF21sC0eH0.html to watch the video. If you are really interested in this I can help you. Hope to see you soon

@v.selecticalandelectronics3691 4 ай бұрын

Very good 👍👍

@T2D.SteveArcs 4 жыл бұрын

Hi Lewis can triac handle been short circuited I would expect this to cause failure of the triac ie fail short

@LewisLoflin 4 жыл бұрын

A short circuit will destroy the triac. While building this use a low-power triac and a current limited power supply untile you are sure it is working. I used a low-watt light bulb in series with the power supply.

@kannan1982vhgf 2 жыл бұрын

Hi, How can I take variable output through scr.. by controlling gate in put voltage say upto 20 amps output, is there any circuit. This is for making battery charger.

@LewisLoflin 2 жыл бұрын

This circuit will do just that with the correct SCRs. You have to use a microcontroller with a zero crossing detector to phase control the output. See www.bristolwatch.com/arduino/arduino1.htm

@devilvortex1 4 жыл бұрын

I have not completely understood. How many volts are the gates of the SCR powered?

@LewisLoflin 4 жыл бұрын

SCRs are current operated not voltage operated. The current is fairly low but wide range.

@remcobooy9837 4 жыл бұрын

Don't you mean the 2 SCR's are thyristors instead of triacs, like a TIC106M. The symbols @7:50 are thyristors....

@soulofcinder2351 5 жыл бұрын

can we control the lightbulb without variable resistance? so that it works as soft starter

@LewisLoflin 5 жыл бұрын

What variable resistance? You can just switch it off-on by turning on the optocoupler(s).

@amar-bangla90 3 жыл бұрын

thanks for sharing sir , how can I get the code? actually i want to use big size of scr to control high amp spot welding machine.

@LewisLoflin 3 жыл бұрын

There is no code as such unless you want to phase control the output with a microcontroller. Not sure what you mean by code.

@amar-bangla90 3 жыл бұрын

@@LewisLoflin sir thanks for your reply, actually I want to use arduino UNO+ two scr +potentiometer, and 1x 7 segment display, when controlling light bulb 💡 intensity, show the seven segment display 0-9, can it's possible sir, if possible send me ino code plz.

@LewisLoflin 3 жыл бұрын

@@amar-bangla90 See the following. How you program the display is up to you. kzfaq.info/get/bejne/ndSclraQ3bXUaZ8.html

@otoauto2257 10 ай бұрын

Hi @amar-bangla90 for spot welding machine, use mechanical relay or contactor with voltage zero-cross switching control circuit will be ideal solution. no sparking or arcing, lifetime prolonged. you can visit kzfaq.info/get/bejne/j7SqeNF21sC0eH0.html for more information