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Hello, I want to switch (just ON/OFF no Dimming control) 20 compact flourcesent lamp using triacs (BT139 or BTA140) and an opto isolator(MOC3021). every lamp a separate triac, and i control them with a mcu(AVR). I have tried the Typical application circuit in MOC3021 datasheet, but i have too many problems! (...)
All, I want to make a dimmer project using PICAXE as brain that control PWM output. I would like implement MOC3041 (Opto with internal Zerro Cross Detect) and a triac as output of dimmer. Does any one have circuit/schematic for MOC3041 or alternative circuit, maybe? Much appreciates for your attention. Irfan
Hi , can anyone give the details about the triac BTA12 and BTA40, and can we use triac in higher amps application based circuit. Awaiting reply Thanks & Regards dayal
A specification like 275VAC usually refers to a "X2" capacitor, a family of devices dedicated for mains voltage parallel connection for filtering and EMI supression purposes. They are mainly build as polypropylene (MKP) or polyester (MKT) metallized foil capacitors, available from all major manufacturers. They are perfectly suited as triac snub
Hi Friends i'm in need of circuit which should switch (Hot switching NOT neutral) 2500 watts inductive load from micro controller. Please explain about when and where to use snubberless triacs. What current rating triac should i use for the specified load. Thanks in advance.
Hi All, I am very new about the opto triac driver circuit. My intention is to use a microcontroller I/O to switch the 240VAC signal to control a solenoid coil . The solenoid coil require a input of 240VAC, 50 - 60Hz and 80ma. After I done my research, I find that opto-triac and mechanical relay are very common to use in this kind of (...)
Thanks for the info. I was indeed looking for a simple solution (NOT DSP). It's now done with a triac and var.resistor circuit. The purpose is to do it with a PWM signal. For so far thanks.
Sense a zero cross @ rated frequency as long as you have a active cross enable a triac to feed AC.
If you intend to control an inductive load (motor) in burst mode with zero-crossing MOC then you can consider elimination or reduction of the snubber .. Here is an article on "NEW triacS: IS THE SNUBBER circuit NECESSARY?" which will help you in selection of a triac and snubber circuit while working with inductive loads: (...)
Hi, I had a problem driving a digital triac from my pic microcontroller. I've been using +12vDC relays to control 220vAC loads. Christmas is coming and I want to build a simple light sequencer for my Parol composed of 8pcs of 10w 220vAC incandescent lamp. I'm sure that relays are not suitable for this application. Our local electronic store
You'll need a microcontroller, a triac, and a zerocross detector. Thats all. Check out microchip and atmel application notes. App. notes about motor phase control would describe the circuits more or less the same you need. Load would be lamp rather than a motor.
Is there any special reason to avoid triac and waste time and money using MOS ? triac is the first choice for this application.
I make a 12Vac dimmer useing hotlek mcu to drive the triac the circuits are in the attached. . . . i get problem when i get fire to the triac then the 12Vac was distorted. And it casse me cannot detect the zero crossing ... anyone can help thx!! normal 12V ac when triac was not fired
Hello, I have triac circuit which I want to use to control a split phase motor. Currently I am trying to send some pulse train using a micro to switch the triac on and off but I don't seem to get anything at the output of the triac. I am trying to based triac switching on this (...)
Hi there is it possible that someone can help me with the above Phase control IC.I'm encountering some problems with the application example - triac Control for up to 50mA Gate Trigger Current.I've reduce the AC voltage to 26V AC too suit my circuitry,which drives a 24V 150W halogen lamp.With this I changed some resistors for eg Rsync is 27K (...)
Thanks for your prompt response. I noticed that in your schematic it says IGT <= 15mA The triac I am using has an IGT <=35 mA Will I have to change the resistors and capacitor values?
Hi I have encountered the same phenomenon long time ago when there was no triac with snubber and I have to use an external snubber. I think the problem relay to connection of inductive load the triac Look at ST site for some application note regarding triac design for inductive load All the best Bobi The mi
If it's a capcitor motor, turning both triacs simultaneously on (= not keeping a switchover time) is a nice way to cause pretty high currents and possbly damage the triacs. The current is at least sufficient to cause contactor welding, I've already tried. If you're sure to avoid this particular issue, the regular motor inrush current can be still t
If it is a single phase induction motor like ceiling fan motors, you can use triac (voltage control) to control its speed. Check these
Hi, For AC control both can be used but in case of high power application, SCR is preferable to avoid misfiring of triac, as triac can be fired with both positive and negative voltage to the gates but SCR can only be fired with positive voltage applied to the gate and hence chance of misfire is less. Hope this helps. Tahmid.
I have a project in which i will control the speed of the electric fan (220Vac, 60W, 5A max.) through the microcontroller automatically depending on the temperature. I was planning to replace the fan's switch with either a relay or triac. Min. time interval between switchings is 10seconds. Which do you think is better suited for the application:
You make it sound like the external triac has it's gate shorted to the load terminal. It's gate after triggering is carrying a small holding current which means it's effective series resistance is high not low.
An 100 or 120nF X2 rated cap with a series 1000 ohm surge limiting resistor (2W, 500V rated) will limit the current to near 10mA, put the LED in a bridge rectifier, (any 4 diodes with a V>5V and I>50mA will suffice) and this will work fine, for a triac dimmer input, worst case dissipation on the 1000 ohm will be 0.8 watt. (for 5mA rms in the LED u
Hi. Would it be possible to use this (or any other suggestions) triac to switch 40W bulbs connected to a 240V power supply using a 5v signal? (Arduino Microcontroller) I am unaware of ex
I am driving a heater wire from triac BT136 which previously was controlled by a relay. Heater wire resistance : 78 Ohms Heater wire Inductance: 0.47mH (measured by digital multimeter---UT70A) Heater Capacitance: 0.15uF (measured by digital multimeter---UT70A) Heater wire current: 2.55 Amps (RMS) at 220V(RMS) I just have to sw
i want to use a 1?F capacitor to start the motor with a triac and triac to control the speed Do you want two separate circuits for starting and speed controlling? This article gives a few circuits with application notes.
Good afternoon. I am trying to use a triac to turn on and off the mains connection to a load. This load is directly connected to the mains (without a transformer) because it is a Cockroft Walton Ioniser (with capacitors and diodes). I'd like to use the triac with this configuration:
I'm supposed to write a code (CCS compiler) for PIC 16F877A, to control the speed(on,off and change speed) of a fan using a triac. I do not know how this circuit really works. What is expected from me is coding. circuit is being built by someone else. Both of us are very new to this area but we are supposed to finish this soon. Can any (...)
Hi, I have developed an Halogen Lamp Driver circuit based on triac T1235H of ST Microelectronics. This circuit have to work at 220Vac. The gate of the triac is driven from a GPIO pin of STM32L152 microcontroller. The triac firing pulse generated from the STM32L152 is based on ZVC circuit (...)
This application note on the ST web site describes their Snubberless triacs:
Dear Edaboard Community , I am using the circuit in the attachment without problem while i am driving fan motors up to 0.8 kw . In order to reduce cost i tried to remove L2 chooke inductor (150mH) in the drawing. It is a special made toroid inductor and costs money. When I removed the inductor and shorted that path ,my circuit still works as it
Hi! Can someone help me on designing snubber circuit for triac. Our professor gave us this circuit and ask us to find a triac that can operate the motor. I will appreciate all the help that I will get. Thanks! file:///C:/Users/DELL/journal/Desktop/metro.JPG
triac dissipate up around 40W at max load, but check datasheet. You need adequate heatsink its normal. Use 330R resistors instead 100R.
This is my first attempt to design a circuit with a triac. I'm building the attached circuit but I can't get it to work. I even tried a push button switch in place of the MOC3023 but still can't get the solenoid to energize. I know it works if I connect it directly to the 24 AC. I tried both simulation and actually breadboarding the (...)
Well You have a triac right? So all yo u need to do is, control the 'G' of the triac. Can you tell me the voltage required on 'G' for control action?
Could you help me? I tested user interface part that contain five push buttons , a LCD , and two crystals(7.68MHz and 32kHz).The 5V power supply is built with a transformer .The zero-cross and a triac inputs are not connected to the PIC.When the dc volt is applied to PIC , "Welcome Screen" is not seen although the push button is pressed.Why? t
I assume the 'high power' of the DC motor is 'DC power supply'. If it's DC power supply, probably you could use MOSFET or IGBT to replace the triac. Can you have that option?
hai i've connected a 230 v powersupply through a triac (bta 41) to a circuit i would like to change the firing angle according to the current or voltage variations to give the constant power to the can i find the variations of voltage and current .schematics also welcome sunish
In short, the RMS value will be used with relation to sine waves which are AC-coupled to eliminate the effect of DC bias, whereas the True-RMS value will be use to measure the RMS of complex waveforms, such as sine waves chopped by a triac, triangle or square waves .. More info: "AC MEASUREMENT application GUIDE"
how i can on the ATX power supply for my micro-controller board . in my universal rf remote controller board , after switch on the CFL1-4 , microcontroller restart . cfl drivers with opto triac , isolated relay , but still there is problem . board try with cd ,dvd player power supply , tran
Hi there is it possible that someone can help me with the above Phase control IC.I'm encountering some problems with the application example - triac Control for up to 50mA Gate Trigger Current.I've reduce the AC voltage to 26V AC too suit my circuitry,which drives a 24V 150W halogen lamp.With this I changed some resistors for eg Rsync is 27K (...)
Hello Guys, I am here again for AC switch only. I have used triac for AC switching but the requirement is High Frequency AC Switching, which can be achieved by using MOSFET. So can anyone help me in designing AC switch using MOSFET?
I wish to switch a large, possibly inductive load AC mains (up to 250Vac or 440Vac) using SCRs. I could use a triac but these present problems in switching off with inductive loads and require snubbers (except the snubberless triacs) but for the moment triacs are not an option. It is simpler to use an SCR in this (...)
Hi there, I have a power supply with a filter, diode bridge and a large cap to hold the voltage close to DC. A NTC is mounted to minimise inrush but this is not enough due to its lose (Thinking Green :-) ) When powering up large inrush currents are seen. Is there a cheap and easy way to elimnate this problem. Using Relays acroos the NTC
Dear All, I need to control the speed of common ceiling fan using a triac/dimmer I know about a dimmer circuit but it uses a POT. I want to design a digital dimmer which get some Analog Voltage/or PWM from MCU and control the speed or please tell me any other way i can do this.
I don't see an actual issue. I've operated optoc triac circuits designed for 230V at 115V without any changes.
You'd be better using a triac, with a circuit to drive it, maybe a cmos flip flop ic depending on the application.
you will get 230v servo motor for this application. you can drive the motor rotation by changing supply pin( my relay or triac)
hi freds! I want to build a triac dimmer by using Transformerless power supply. I am using common hot power supply. i am using PIC microcontroller to drive the Gate of triac BT136.i am aso having the Zero cross detection by using software problem is the bulb is not glow.i checked in simulation there is correct Pul
This device was made in order to test the big amount of spoiled tools like drill or grinder. The device was made of a transformer from an old Russian TV set. The regulation used was on U2008 system, through which it