Please use a 1k resistor and connect the triac with the correct pinouts, and make sure the mt2 of the triac has a common connection with the ic 555 ground line. In fact, in many of control applications, it has replaced scr by virtue of its bidirectional conductivity. Moc3021 is a zerocrossing triac driven optocoupler or optoisolator. Additional information on the use of optically coupled triac drivers is available in application note an780a. All devices are guaranteed to trigger at an i f value less than or equal to max i ft. Sep 10, 2018 moc3021 datasheet optoisolators triac driver fairchild, moc3021 pdf, moc3021 pinout, moc3021 equivalent, data, circuit, output, ic, moc3021 schematic. The moc3021 was designed for interfacing between electronic controls and high power triac to control loads for ac votage operations. The light produced by this led activates the triac and that time power is switched on. Moc3021 and moc3022 typical applications of moc3020.
The nte3048 consists of a gallium arsenide infrared emitting diode optically coupled to a silicon bilateral switch in a 6lead dip type package. Simply give a small pulse at the right time to the led in the. Applications solenoidvalve controls lighting controls. The trigger signal is coming from a pic16f676 microcontroller. I have already given you the link for the 180v driver circuit in your previous comment. In this circuit the hot side of the line is switched and the load connected to the cold or neutral side. Moc3021, moc3041 and moc3020 are all similar and can be used in the same way. Here the gate is the emitter of a npn bipolar transistor. Rms voltage control circuit with moc3021 and bt6 triac is a power electronic component that conducts in both directions when triggered through gate.
Randomphase optoisolators triac driver output 400 volt peak package. Order this document semiconductor technical data by moc3020d. The simplest triac gating circuit that can be implemented is shown on figure 3. Its also having advantage of low cost over back to back thyristor circuit, to control current upto 4a, voltage upto 600v and low inrush i recommended triac, above. They are designed for use with a triac in the interface of logic systems to equipment powered from 115 vac lines, such as teletypewriters, crts, solidstate relays, industrial controls, printers, motors, solenoids and consumer appliances, etc.
Passive tunable integrated circuits ptics 9 ptic controllers 3. Circuit of the module shown here offers improved performance and. This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures triac needs higher gate current by adding a transistor at the output of the optocoupler circuit. They are designed for use with a triac in the interface of logic systems. The trigger signal is given according to an input event to the microcontroller. Applications of triac next to scr, the triac is the most widely used member of the thyristor family. This device is designed for use in applications requiring isolated triac triggering. A small pulse clock pulse with 5 v range is applied to its input that is pin 1 and pin 2. How to use optocoupler and triac to control ac load tutorial. The moc303xm and moc304xm devices consist of a algaas infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. The ac bulb dimming circuit is based on the moc3021optoisolator triac driver and bta16 triac. Compliance with the safety ratings shall be ensured by means of protective circuits.
Moc3021 datasheet26 pages motorola 6pin dip random. Apr 10, 2010 as optocoupler, i have a moc3021 that is coneccting the control circuit with the power circuit. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit. The moc3020 are designed for interfacing between electronic controls and power triac to control resistive and inductive loads for vac operations. Triacs are the solid state replacements to mechanical relays, and come configured as static relays the modern triacs today are high sophisticated with their specifications and make, one such example is the bta41, 600b, lets understand its technical specification and datasheet from the following points. Meaning it has a infrared light emitting diode led inside it coupled with a triac. They are designed for interfacing between electronic controls and power triacs to control resistive and inductive loads for 115 v ac operations. Jul 24, 20 i use this scheme and when i give impulse to the base of transistor the bulb is turned on, but when there is no signal on the base it remains turned on and i cant turn bulb off until removing supply voltage, can anybody help me. Figure 4 shows a static dvdt test circuit which can be used to test triac drivers and power triacs. This triac based 220v ac motor speed controller circuit is designed for controlling the speed of small household motors like drill machines. They are designed for interfacing between electronic controls and power triacs to control resistive and inductive loads for 115 vac operations. Universal motor speed control and light dimmer with triac and. When a dc supply given to the optocoupler input pins, then the internal led glow and the activate the internal triac. To switch the ac current to the lamp, we have to use an optocoupled triac, lamp and a diac is shown in circuit below.
Moc3021 nte equvilent nte3048 optoisolator with triac output 6pin dip viso7500v vdrm400v. Application triac moc3023 light dimmer with schematic. Tests on the moc3061 family of triac drivers using the test circuit of figure 4 have resulted in data showing the effects of temperature and voltage transient amplitude on static dv dt. Order this document semiconductor technical data by. Simplified schematic and silicon structure of triac acst circuit the silicon structure of an acs is diff erent from a triac or an acst see figure 2. Dec 21, 2018 moc3021 pinout schematic circuit diagram. Pwm input constant current power led driver schematic circuit. Hi, look at the moc3021 and you will find it is a triac driver, it is used to control a triac that controls the current through your lamp. Opto isolator circuit interface to triac sensor based.
Rc snubber circuit design for triacs stmicroelectronics. Rc snubber circuit design for triacs introduction when a triac controls inductive loads, the mains voltage and the load current are not in phase. I have a speed control circuit for a 230v ac motor. Fairchild 6pin dip randomphase optoisolators triac driver output 250400 volt peak,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. A 12012 ac transformer is used for giving power to circuit and for getting sine signal. A 12012 ac transformer is used for giving power to circuit and for getting sine signal to find zero crossing. Normally a pwm signal will be applied to the 1 st pin of moc3021 and the frequency and duty cycle of the pwm signal will be varied to get the desired. Moc3021 triac driven optoisolator pinout, specs, equivalent. Moc3021 datasheet pdf optoisolators triac motorola. As i change the duty cycle of the pwm, it is supposed to change the intensity of the light, but it doesnt work. When the led is triggered the triac is also turned on. Moc3021 light dimmer in this tutorial, you will learn how to make an arduino based 110220vac bulb dimming control system using moc3021, bta16 triac and a zero crossing detector circuit based on the el817 optocoupler. Hi everyone, actually i have made a simple optocoupler moc3021 driven triac for lamp on off.
Since most of the ac loads are inductive in nature, so there is often a need of the snubber circuit with moc3021 and bt6. To order devices that are tested and marked per vde 0884 requirements, thesuffix v must be included at end of part number. Motorola reserves the right to make changes without further notice to any products herein. Moc3021 light dimmer, triac bta16, zero crossing detector. The moc3021 is a zerocrossing triac driven optocoupler.
The proposed test method is per eianarm standard rs443. Triac driving circuit with rc snubber network circuit or have fewer parts and more space on his. A triac, lamp load and a supply voltage are connected in series. Moc3021 pdf, moc3021 description, moc3021 datasheets. In this solid state relay circuit triac and moc3021 optocoupler is used. Apr 12, 2019 the moc3021 is a zerocrossing triac driven optocoupler. Output driver designed for 220 v ac standard 6terminal plastic dip directly interchangeable with motorola moc3020, moc3021. Globaloptoisolaror 6pin dip randomphase optoisolators triac driver output 400 volts peak the moc3020 series, isolated triac triggering. Monolithic microwave integrated circuits mmic tunable components. It has a bta16 triac for phase control and it is driven by an optocoupler moc3021.
May 30, 2019 moc3021 light dimmer in this tutorial, you will learn how to make an arduino based 110220vac bulb dimming control system using moc3021, bta16 triac and a zero crossing detector circuit based on the el817 optocoupler. A simple circuit diagram in which an ac bulb is controlled using a microcontroller is shown below. Controlling a triac with a phototriac an5114 application note. The moc3021 has actually total of 6 pins but pin number 3 and pin number 5 are not used. The nte3049 consists of a gallium arsenide infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. A triac is a bidirectional, threeterminal dual, backtoback thyristor scr switch. A solid state relay ssr consists of four main parts. The setting of p1 determines the phase of the trigger pulse that fires the triac.
High current triac bta41600b datasheet, application. Motor speed regulation, temperature control, illumination control, liquid level control, phase control circuits, power switches etc. Ac motor speed controller circuit electroschematics. To order devices that are tested and marked per vde 0884 requirements, the suffix v must be included at end of part number. Moc3021 circuitry for inductive load with snubber circuit. How to use optocoupler and triac to control ac load. Moc3031m, moc3032m, moc3033m, moc3041m, moc3042m, moc3043m 6pin dip zerocross optoisolators triac driver output 250400 vol t peak typical circuit fig 12, for use when hot line switching is required. Pwm input constant current power led driver schematic circuit diagram april, 2020. The moc3021series consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon bilateral switch. Additional information on the use of optically coupled triac drivers. High current triac bta41600b datasheet, application note. Note that the snapback voltage decreases as the gate current increases from an initial zero point value. This device can switch the current in either direction by applying a small current of either polarity between the gate and main terminal two.
Moc3021 datasheet, moc3021 datasheets, moc3021 pdf, moc3021 circuit. The triac triode for alternating current is an ideal power electronics switch to use for switching applications because it can control the flow of current over both positive as well as negative half cycle of alternating waveform. Motorola 6pin dip randomphase optoisolators triac driver output,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits. As my circuit did not work, i check only the transistor and moc3021 excluding bt6. The power supply circuit r6, r7, r10, c4, zd1, d1, and c5 supplies the microcontroller. Moc3021 datasheet optoisolators triac driver fairchild. The power triac remains in the conducting state until the load current drops below the power triac s holding current, a situation that occurs every half cycle. The most basic solid state relay ssr is shown above being a light source and a triac with a photosensitive gate. The speed of the motor can be controlled by changing the setting of p1. Look at the spec sheets and it will show you how to connect it up. Principle of power triac drive with of a phototriac. Application note an3003 applications of non zero crossing triac drivers featuring the moc3011. May 20, 2018 moc3021 is a zerocrossing triac driven optocoupler or optoisolator.
These components may or may not be necessary depending upon the particu lar triac and load used. The problem is the triac is getting switched on automatically sometimes when i turn on mains. Motorola, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. The values of these passive components are calculated depending upon the load and the selection of components. Simple electronics, electronics projects, dc circuit, circuit diagram, electronic. Since the output is driven by a triac we can drive loads upto 400v and the triac can conduct in both directions hence controlling ac loads will not be a problem. For more information on how triacs and scrs operate see basic triac and scr projects and circuits.
These devices contain a gaas infrared emitting diode and a light activated silicon bilateral switch, which functions like a triac. The triac is fabricated by integrating two thyristors in an inverse parallel connection. Pin number 1 is the anode and pin number 2 is the cathode as per the datasheeta 330 resistor is connected in series with the anode of the ir led. Application note 030 driving triacs with phototriacs.
This module contains a triac triggering coupled with zerocrossing signal detection. The output of u4 monostable multivibrator goes to triac driver optocoupler moc3021 u7 which is responsible for controling the triac by applying a pulse to gate pin of triac. Is the value of 100 ohm 1 watt correct on pin 6 of moc3021. I am using a microcntroller to drive the optocoupler which in turn drives the gate of the triac. Sep 18, 2019 moc3021 datasheet pdf motorola, moc3021 datasheet, moc3021 pdf, pinouts, circuit, ic, moc3021 manual, substitute, parts, datenblatt, schematic, reference. This paper presents a power triac phase control circuit and contrasts it with the. Triac is semiconductor device of silicon controlled rectifier scr and works as the transistor but both are are different. So there is only one pn junction implemented by p1 and n1. Moc3021 datasheet16 pages motorola 6pin dip random. Dec 22, 2018 moc3021 nte equvilent nte3048 optoisolator with triac output 6pin dip viso7500v vdrm400v. The principle used in optocoupler is, mocs are promptly available in integrated circuit form and dont require very complex circuitry to make them work. It is designed for use with a triac in the interface of logic systems to equipment powered from 115 vac.
Apt1221, which also protects the main triac in most cases. Controlling a triac with a phototriac application note. The brightness can be controlled using the potentiometer. Moc3021 microcontroller interfacing circuito electrico, electronica. Triac applications electronic circuits and diagrams. As it can be seen that at time t 1, angle of sinusoid is 45 which means that if we triggered triac at this angle ie at 45, only shaded blue area.