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Questions tagged [triac]

A TRIAC is a component often used to control high power currents, both as a switch and as a "dimmer"-like construction for controlling lamps or electric engines.

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What components do I need to add to the power circuit for this ESP8266 project?

I'm planning to make some controllers for each of the electrical heaters in my house. The heaters use a pilot wire to control their mode of operation: I'm following this project to control the pilot ...
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33 views

MOC3021 optocoupler not working ( or not working , a bit confused )

My Understanding As far as my understanding of MOC3021 optocoupler goes, it should latch pins 4 and 6 whenever there's a current flow between pins 1 and 3. The Confusion Image 1 - D1 not glowing ...
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29 views

Parallel Triac driving same Inductive Load NOT Working?

As per the schematic two same value triacs and driver circuits are connected parallel, Triacs are BTA24 and Opto-couplers are moc3021 and the load is inductive, when i trigger the MOC U1 the Triac Q1 ...
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33 views

Factory PFC correction

Our facility is high power (1000kVA+) But the load is very unstable. Most of the time the transformer is in question of excessive or inadequate PFC situations. The PFC controller is present, the ...
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107 views

Can i get away with a pcb heatsink for a triac?

so, i have a bunch of to-220 L4006L5TP triacs laying around and i have to design an AC phase control pcb, reading the datasheet i saw that the Rθ(J-A) is 50°C/W, the Rθ(J-C) is 3.3°C/W and the voltage ...
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71 views

Overvoltage protection circuitry choice

I need to design a input overvoltage protection for a 45W DC-DC converter rated for a 9-24V wall wart input (so, 45W / 9V = 5A input current at max). So far I've seen two approaches (schematics below):...
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57 views

A question about triac output of zero crossing SSR relay

In a zero crossing SSR if the output is a triac, would the gate be fired/triggered every 180° or would the gate be applied a constant voltage all the time? I'm asking because in both cases the load ...
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88 views

How series resistors influence clearance-creepage requirements?

simulate this circuit – Schematic created using CircuitLab I'm designing a circuit which should leak some amount of current from AC line to PE. The question is regarding clearance-creepage ...
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Relays vs. thyristors: What is best for swiching 230 V lights on and off rapidly (~ 5 Hz)?

I am building my own disco/party lights. 230 V/60 W bulbs, and ideally I would like to switch them on and off at 5 Hz. I was planning on a simple setup with an Arduino controlling the lights. My ...
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1answer
34 views

Operating a 24VAC solenoid with a Triac. Protecting with TVS DIODE, RC Snubber or both?

As part of a project I am controlling 24VAC solenoid sprinkler valves like this https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves/ using a triac (BT1308W) http://www.mouser.com/ds/2/...
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81 views

Overvoltage protection for AC relay dilemma

I am currently designing a safety-related device that has to open a relay when a certain event occurs. During most of its life, this relay will be closed, and only open if the safety event occurs, ...
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679 views

Why does this washing machine have microprocessor pins directly connected to the main AC power?

I'm studying the attached washing machine partial schematic at the point in which the main microcontroller activates 2 water elecrovalves. I would ask: It seems the microcontroller pins 36 and 40 are ...
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3answers
76 views

Triac Dimmer Supplying a Purely Inductive load

I was asked a question in my lab viva today, on a triac switch supplying a fixed value inductor of 0.2 henry. How will the current and voltage of the inductor vary, if the triac's firing angle was ...
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2answers
91 views

Difference between TRIACs holding and Latching current

I am reading wikipedia page of TRIAC. While reading, I got struck with holding and latching current definition. They look ...
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2answers
45 views

How are small triacs able to “switch” or control high power AC loads

I am currently looking ways to control or siwtch a max 220v 35A load. Simple magnetic relay rated for such load would work, but i am exploring the other alternatives too. here i stumbled into triacs, ...
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1answer
57 views

Triggering of TRIAC for Crowbar Protection

I am reading the datasheet of TRIAC (T1235T-8G). I am not sure how to trigger the TRIAC and what do they mean by ...
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64 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
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29 views

Driving multiple loads with a single TRIAC and multiple optoisolators

I simulated this circuit in multisim. It is working fine. However, I am just curious to know if it is possible to drive multiple loads with multiple opto-isolators with single TRIAC? Something like ...
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1answer
67 views

TRIAC won't turn on/turn off

I'm trying to make simple lamp switching circuit to work, but it just doesn't want to work as intended - question is, why? I'm using MOC3021 random phase optotriac with BT136/600E sensitive gate ...
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167 views

Triac Equivalent or Substitute

I have a schematic which uses a triac, for example a BT136. Please have a look at the attached schematic (this is a schematic for a soldering station) What parameters from the datasheet we should ...
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1answer
117 views

Arduino PID and AC controlling

I'm trying to make my own PID temperature controller using Arduino. Arduino PID library outputs a PWM signal. I need to control 230VAC using this PWM like a triac phase angle controlling. If I use a ...
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1answer
64 views

My triac turns on when gate attached to vcc (good)… but also when connected to ground (bad)

I'm still really new at working with triacs and understanding them, but I want to make a circuit that allows a microcontroller to turn on/off an AC signal (very low power, not mains, don't worry) to ...
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88 views

Problem with Solid State Relay based on MOC3061

I was experimenting the circuit below. In the load, I placed the input of a full bridge rectifier. The issue is that the power triac is never activated. Sounds like the zero cross is not working. Is ...
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73 views

Control 24VAC solenoid with arduino using a octocopuler and a Triac

Following a previous question I implemented the following schematic on my PCB. The schematic : My PCB: I have been unable to make it work, if I measure the voltage on j13 it's allways 25v, i know ...
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1answer
53 views

TRIAC not turning off correctly

I am using this circuit with a BTA16 TRIAC: The load is a 110/12 V transformer. I am getting spikes in the output. Note: CH1 is the secondary of the transformer (load), CH2 is the MOC3021 input. ...
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1answer
33 views

Multiple lights dimming using single TRIAC zero detcetion module

We know well we can dim single lights using single TRIAC module with the help of PWM signals from controller. My question is, I want to control the lights which are placed on hall. Let us consider 15-...
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62 views

Bridge Rectifier as Load for an SSR Circuit

Somehow, I wanted to control the power to a bridge rectifier. I had two ideas in my mind: 1- Using a PCB mounted power relay driven by a transistor (is isolation maintained?) 2- Using a SSR, i.e, a ...
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1answer
68 views

Understanding this TRIAC circuit

I have an inquiry about the circuit below: When a high signal is continuously given to the transistor, it enables the optotriac with zero crossing. The optotriac enables the power triac, and the AC ...
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1answer
120 views

RobotDyn dimmer controlled by ESP 07 only results in flickers

I use a dimmer module connected to an ESP07 which has Node MCU firmware. I'm using the Z-C interrupt to skip sinusoidal pulses, however I only obtain flickering instead of dimming. The light is bulb ...
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1answer
188 views

Driving a 24VAC solenoid with arduino using a octocopuler and a triac

Following a previous question I have redesigned my schematic: I'm trying to energize a solenoid used to open and close a 24VAC sprinkler valve I have the following questions : 1) The GPIO leg can ...
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50 views

Would it be a good idea to use a TRIAC as a crowbar in this application?

The idea here is to sense when the electrodes of the transformers secondary make contact which would be sensed by the optocoupler and trigger the SCRs to switch ON the transformer for spot welding. ...
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104 views

Avoiding turn-off of zero-crossing optotriac

I'm designing a circuit that switches a load using a regular TRIAC (say, a BT-137) being fed by a MOC3063 - an optotriac with zero crossing detection. The circuit being fed by the TRIAC can be either ...
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334 views

Disadvantages of MOSFET over Triac for line voltage control of AC/DC devices

Background: (Proper galvanic isolation, e.g. opto-isolation, isolation transformer, etc., is assumed for the question) When working with 110/220AC, switching elements are typically relays (solid ...
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1answer
135 views

Triac optocoupler circuit

I am working with this circuit: I am using a snubberless triac (BTA216X) and hence I am getting rid of snubber circuit (39 ohm res and 0.01 uF cap circled in red). Am I right in doing so? Besides ...
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1answer
118 views

triac burn out problem

I'm working on 2000W furnace controlling with Atmega32a and an optocoupler with BTA40600 triac, my program is designed to heat up the furnace to 850 degree Celsius in one shot (always ON state til ...
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57 views

Help with circuit to alternate a light switch with solid state

I have designed a PCB that allows me to turn a light on with a mechanical relay. The difference between your average implementation here is that I also wired the board up to a wall light switch which ...
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3answers
685 views

Zero-crossing detection

I'm doing a circuit that controls a charge for TRIAC, with zero detection. Whenever I tested the circuit, regardless of what I was sending from the microcontroller, TRIAC always sent all the current ...
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1answer
240 views

Dimmer with zero-crossing circuit and TRIAC

I want to make a dimmer to control a huge power resistance of 700W. For this, I made a circuit that detected when the wave reaches zero (the circuit above the figure) and another that controls the ...
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414 views

Triac inductive load

I need to drive a inductive load with a triac dimmer. Circuit uses zero-voltage cross and delay for gate trigger. An additional circuit for detecting zero current cross has been added. So, what are ...
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118 views

Triac dimmer burned transformer as load

Why did the dimmer burned the linear transformer? It is a MOT transformer, secondary rewound with 7 turns and a resistive heating element of 800w. While the transformer worked fine at line 220AC, ...
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1answer
133 views

Triac Trigger Problem

Could someone please tell me why the TRIAC is not triggering as it should? After zero crossing is detected, timer has programmed delay from 1ms to 9ms, set by potentiometer. The trigger signal is ...
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2answers
121 views

What does “max” really mean in gate trigger threshold of a triac?

I am trying to understand the parameter Vgt (max) for a triac (or any semiconductor with a gate threshold parameter), mainly the max. part of it. For example, on page 2 of the following datasheet: ...
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4answers
100 views

Which electronic Switch to use with 5V as Triggering Signal and 12 V as actual signal?

Which electronic switch should I use if I want to control 12 V,1A signal with a 5V arduino output signal? [12 V is high powered signal so can't use boosted 12 V output from 5 V Arduino signal - Image ...
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1answer
158 views

Triac moc3041 resistors

I'm trying to understand few things about triacs etc. and I found datasheet for MOC3041 And there're two resistors which purpose I don't really understand. I'm talking about the 330Ohm and 360Ohm ...
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1answer
71 views

What is the specific function of a triac inside a soldering station?

I'm trying to understand the different parts inside a soldering station. One of the components i found was a Triac. I've tried to find an explanation for the use of a Triac inside the soldering ...
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74 views

Troubleshooting Dimmer Circuit [closed]

First off I do apologize for my ignorance, I know very little on the topic so please be patient. I have one of these that are broken http://www.smartliving.com.au/z-wave-in-line-dimmer.html Its a ...
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140 views

Help building triac dimmer switch circuit

I'm trying to build a dimmer switch circuit. I'm terrible at reading circuit diagrams and then bread boarding them. Here is a pic of the diagram and two pics of my circuit. The light comes on full ...
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1answer
96 views

Ways to drive TRIACS

I have seen many different ways of driving TRIACs, and would like to understand what should I consider when choosing between them. One option is turning the TRIAC by connecting the gate to the load: ...
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2answers
413 views

Trigger 2 triacs in parallel simultaneously

I am using a STM TPDV1240RG triac to control an AC load. This triac is rated for 40A. The current in my circuit is up to 80A so I was thinking of putting 2 triacs in parallel to share the load. I am ...
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29 views

Triac doesn't triggering when the power jack pins switched?

I built a power circuit with MOC3063 & BTA40600 for controlling heating element (2000 watts) according to the image. when I plug the jack in let's say one direction the circuit works like a charm ....