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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AC motor control with triac or relay
I want to remote control (WiFi/Zigbee) a water pump AC motor, 1 phase or 3 phase depending on the case, with the smallest board size possible.
I have used large motor AC contactor in past, it works ...
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1answer
89 views
How to switch 220 VAC? (Magnetic relay, SSR relay or triac)? [on hold]
I want to switch 220V AC with a microcontroller. Before I used magnetic relays or SSR relays, but now I want to use a triac for this function (like in this circuit) and my load can be any 220 V AC ...
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26 views
Halogen 24V/150W light dimmer design
I have 64640 HLX (24V/150W) halogen lamp with 24VAC/300W power source and I want to design a dimmer to control the halgen light. I have two solution in my mind:
1- DC solution : using PWM and power ...
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1answer
50 views
RC Snubber For Phase Angle Controller
I have a phase regulator and I'm using it for regulating the RPM of a fan - centrifugal blower. The motor is a shaded pole induction motor (220VAC, 28W).
The regulator is working fine, but if the RC ...
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30 views
Triac and Opto parameter checking
i'm looking to build and control a 220v ~150w heating element with an Arduino. for controling the load I was only able to find two 4n35 and a BTA12 triac. (one is for zero crossing detection)
My ...
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3answers
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Crowbar circuit causes unexpected behavior for op amp circuit
I am using an op amp to amplify an input signal from a microcontroller, which in general is working fine.
For over voltage protection, I added the crowbar circuit taken directly from figure 32, page ...
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1answer
43 views
Triac power dissipation
I'm driving a high power load with the BTA440Z (datasheet):
line voltage is Vac = 230 AC, load power is P = 1.33 kW, thus load current is ~ I = 5.8 A.
If i swap the load with another ...
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1answer
23 views
I want to handle the voltage and current spikes from inductive load of 220V AC ceiling fan
I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.
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1answer
34 views
Triac circuit resistor tied to motor
I've run across a triac circuit which has a huge 510 ohm 50W load resistor tied to a 115V 1.6A PSC fan motor. I'm not quite sure what that big resistor is for. Ideas?
simulate this circuit – ...
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2answers
97 views
How to test a TRIAC with just a digital multimeter and no external circuit
I need to fix an electric kettle and would like to test the health of the TRIAC BTA20. How would you test this component health with a digital multimeter - without any extra components and ideally ...
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1answer
120 views
Having a problem using TRIAC in my project:
I’m having a problem working with TRIAC (BT-131) in my project. I’m trying to switch a low power LED with a 5V DC output from a sensor. I’ve used an Opto-coupler (MOC3021) in between the TRIAC and the ...
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62 views
Resistance issue in a triac-optocoupler switch
I have made the following circuit to control my water pump with Arduino(UNO R3). I have tried many resistors (calculated myself) to limit current in the optocoupler and triac, but failed to carry the ...
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35 views
Triac Driver Datasheet - LED Trigger Current
Looking at the datasheet for MOC30xx (here: http://www.farnell.com/datasheets/1806097.pdf) I see the following note on p4 under the table outlining the respective LED Trigger Currents of the various ...
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3answers
78 views
How can I control TRIAC firing angle automatically with a DC voltage?
I have to build an analog proportional controller for a 127 V, 1 kW AC heating resistance. The power delivered to the heating element must be proportional to the difference between a set point ...
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1answer
93 views
Triac dimmer makes audible noise (hum or buzz)
I have some triac dimmer from IKEA (bought several years ago).
This dimmer makes audible noise (hum or buzz), very notable during night when it is placed on a bedside table. I failed to find the ...
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1answer
61 views
MOSFET relay as an alternative for TRIAC relay
I use a 2 A TRIAC relay with non zero crossing from sharp in one application.
Unfortunately I couldn't find this type of relay, and I want to use another relay (MOSFET relay 2A from TWOARD). Theses ...
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2answers
36 views
optocoupling a triac: correct pins
I was reading
PLEASE BE AWARE THAT... the moc output MUST BE between the triac pins
A2 and G it is never written in any datasheets but it MUST be so or
your triac won't commute ...
https://www....
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18 views
TRIAC based SSR output wiring COMPARISON
I want to use a triac based SSR (AQH-3213), I checked the datasheet wiring diagram, and it seemed simple. The problem is that its construction is the same as the triac driver optocoupler (MOC3041), ...
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1answer
44 views
Triac control circuit through load
Why is it that in every triac analog dimming circuit I find that the triac triggering circuit is fed through the load and not straight from the mains??
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1answer
74 views
What are the differences between triacs? [closed]
I need to replace a broken BT134-600E triac. I found out it's 600V 4A sensitive gate triac. Which of the following triacs can be used to replace the original one and why?
MAC97A6
MAC97A8
BTA16-600B
...
0
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1answer
30 views
Triac wiring section
When wiring the power cables in a house, normative says wires must be typically 2.5, 4 or 6 mm2 in section for 230 V and 10...40 A.
However, legs of a triac (thyristor, see this one by example) are ...
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2answers
125 views
Triac Switching circuit with Optocoupler
I am trying to control home devices using a microcontroller and a TRIAC. For switching, I intend to use an optocoupler and triac-based circuit. The circuit is given below (also plenty are available on ...
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111 views
TRIAC broke (literally) – why?
I have built a circuit according to Dimming 230V AC with Arduino, with two output channels. The basic principle is:
An ATtiny does zero detection via an optocoupler; when AC crosses 0 V, it triggers ...
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2answers
45 views
Triac switch cause of heating
As a newbie to hardware design, I'm having some trouble picking components. I want to switch a 24V AC Solenoid valve using a triac.
According to my research/experience, transistors heat up during use. ...
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2answers
51 views
How to connect power phototriac's gate pin?
I have inherited a design that uses a power phototriac (basically an optotriac with a built-in TRIAC) -- the VO2223B -- that includes a pin to access the power TRIAC's gate (pin 5 below).
The ...
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1answer
60 views
Questions regarding eliminating hysteresis in ac dimmer
In the following circuit it says:
“This hysteresis effect can be eliminated however, using the circuit from a detailed application note from Littelfuse shown in Fig. 6.4.4. Here the capacitor C1 is ...
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1answer
118 views
Driving Triac With MOC3021 for 12 v ac
i am using triac bt136 with moc3021 to drive 12vac but i found the problem
is it possible to drive the triac on 12vac
i made the circuit as shown in link on 12 vac
but i didn't get any exact sine ...
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3answers
103 views
Use a TRIAC to connect/disconnect a capacitor to a PSC motor
In the image above, we see a PSC motor, with its 3 terminals, connected to a control board.
This board has a RUN capacitor always connected to the motor. When the motor has to turn, the board applies ...
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1answer
118 views
BT136 TRIAC not closing on LOW signal to the MOC3021
I am trying to make an AC dimmer. I am following this schematics for my circuit,
Circuit Link
as you can see in the below picture that I am able to turn the signal on after a short while of zero ...
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0answers
44 views
Can't get my led bulb to turn on using triac and optocoupler
I have made the below circuit but my LED bulb won't turn on, although circuit works fine if replace the led bulb with a small led and ac supply with 5v dc supply.
Can someone guide me in a right ...
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1answer
91 views
Problem with TRIAC simulation
I am trying to simulate a triac with MOC3020 but the MOC3020 does not output to drive the gate. The schematics is shown below:
The waveform follows:
Waveform with updated duty cycle to allow LED to ...
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0answers
151 views
Light dimmer circuit using triac gives fluctuating dimming
Light dimming using triac and optocoupler is very common and basic circuit, I have successfully tested the dimming for 1 channel (1 triac, 1 opto-coupler) now I want to add one more light dimmer with ...
2
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1answer
143 views
SSRs influenced by physical proximity?
This is part of a two-head EVSE. The two solid-state relays are used to drive contactors that supply high current power to the vehicles. I used to use a MOC3040 based triac circuit for this job, but ...
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1answer
77 views
Help for voltage is being passed trough load, even triac is OFF condition
We are using below circuit for home automation. We are facing problem when 5v battery is not passing to the circuit,but even 1 volt is being passed trough load, even triac is OFF condition.. Please ...
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0answers
91 views
BTA16 triac snubber and operation quadrant
I am working on a dimming circuit to be operated by an ESP8266.
I have read a lot on this over internet and got a working circuit as well. But myself I am not satisfied with my understanding of ...
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2answers
138 views
Mains AC overvoltage protection using a TRIAC
I am trying to design a circuit that protects 127V appliances if plugged in a 220V socket (in Brazil 127 and 220V sockets have the same shape and it's easy to plug a 127V appliances in a 220V socket ...
0
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1answer
71 views
Best TRIAC for zero cross detection
I already asked this question Triac BT 136 getting shorted when load is given to T1.
When I referred this link, I understood rate effect is the root cause for our problem. To avoid this either we ...
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1answer
144 views
Triac BT 136 getting shorted when load is given to T1
We have a optocoupler switching circuit which triggers the TRIAC with ZCD. Everything is working fine with all inputs. Connection is
T2 as a input
T1 as output
Gate as Trigger from Optocoupler
As ...
0
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2answers
89 views
TRIAC and Driver is heating up
I am trying to do a dimmer and below is my schematic. Before doing an actual PCB, I did a proto on a veroboard and the circuit works perfectly. Now when I did a PCB and got it back from the ...
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0answers
47 views
hump on rectified signal and inconsistency on gate signal
Following is the image of my circuit, I am working at the moment. This is not my own circuit but I am trying to understand and work on it.
Following is the signal I am getting at Gate2. What could ...
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74 views
How to safely switch a big inductive load with a Triac using a capacitor snubber?
I am building a Spot Welder with a big powerful transformer.
I have to switch a big inductive load of 70mH (input of a transformer)
The switching will be done with an SSR (Opto Triac Zero crossing SSR-...
0
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3answers
314 views
Calculate Angle for Triac Phase Control
Triac-based phase control of the mains power into resistive load.
According to this post,
https://www.physicsforums.com/threads/how-to-calculate-rms-voltage-from-triac-phase-angle.572668/#post-...
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0answers
127 views
Pulse skip modulation vs Phase cutting for AC inductive loads?
What is preferred and safe mode for controlling power to an Inductive AC load when driven by a Triac?
I am using a microcontroller with zero crossing optocoupler to drive the control signal and the ...
0
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1answer
70 views
Low current control of triac speed controller?
I'm using a cheap Chinese commercial triac speed controller to control a universal motor that pulls considerable amperage (where "considerable" is no more than 15 amps at 117 volts).
I would like to ...
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1answer
168 views
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 ...
0
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1answer
164 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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3answers
351 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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0answers
320 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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3answers
168 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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2answers
140 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 ...
