Application note 030 driving triacs with phototriacs. A triac is a bidirectional, threeterminal dual, backtoback thyristor scr switch. Shop online moc3021 optoisolated triac driver icuse to interface electronic controls and power triacs to control resistive and inductive loads at 220v acdip6free shipping and cod available. Passive tunable integrated circuits ptics 9 ptic controllers 3. Moc3021 circuitry for inductive load with snubber circuit. So there is only one pn junction implemented by p1 and n1. The moc3021 was designed for interfacing between electronic controls and high power triac to control loads for ac votage operations. Motorola reserves the right to make changes without further notice to any products herein.
As my circuit did not work, i check only the transistor and moc3021 excluding bt6. It has a bta16 triac for phase control and it is driven by an optocoupler moc3021. 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. 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. 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. Triac applications electronic circuits and diagrams. How to use optocoupler and triac to control ac load tutorial. 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. Hi everyone, actually i have made a simple optocoupler moc3021 driven triac for lamp on off. Output driver designed for 220 v ac standard 6terminal plastic dip directly interchangeable with motorola moc3020, moc3021.
The moc3021 has actually total of 6 pins but pin number 3 and pin number 5 are not used. May 20, 2018 moc3021 is a zerocrossing triac driven optocoupler or optoisolator. Motorola, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. In this circuit the hot side of the line is switched and the load connected to the cold or neutral side. All devices are guaranteed to trigger at an i f value less than or equal to max i ft. Sep 18, 2019 moc3021 datasheet pdf motorola, moc3021 datasheet, moc3021 pdf, pinouts, circuit, ic, moc3021 manual, substitute, parts, datenblatt, schematic, reference. Moc3021, moc3041 and moc3020 are all similar and can be used in the same way. Optoisolator zero crossing triac driver description. Sep 10, 2018 moc3021 datasheet optoisolators triac driver fairchild, moc3021 pdf, moc3021 pinout, moc3021 equivalent, data, circuit, output, ic, moc3021 schematic. A solid state relay ssr consists of four main parts.
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. How to use optocoupler and triac to control ac load. Motorola 6pin dip randomphase optoisolators triac driver output,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits. Moc3021 nte equvilent nte3048 optoisolator with triac output 6pin dip viso7500v vdrm400v. I have already given you the link for the 180v driver circuit in your previous comment. If both neutral and phase lines are available on the board, the maximum. Figure 4 shows a static dvdt test circuit which can be used to test triac drivers and power triacs. 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. Moc3021 datasheet26 pages motorola 6pin dip random. This device can switch the current in either direction by applying a small current of either polarity between the gate and main terminal two. Application note an3003 applications of non zero crossing triac drivers featuring the moc3011. Pwm input constant current power led driver schematic circuit. The triac is fabricated by integrating two thyristors in an inverse parallel connection. A simple circuit diagram in which an ac bulb is controlled using a microcontroller is shown below.
The moc3020 are designed for interfacing between electronic controls and power triac to control resistive and inductive loads for vac operations. Moc3021 microcontroller interfacing circuito electrico, electronica. Controlling a triac with a phototriac application note. Applications of triac next to scr, the triac is the most widely used member of the thyristor family. 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. The most basic solid state relay ssr is shown above being a light source and a triac with a photosensitive gate.
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. Universal motor speed control and light dimmer with triac and. Ac motor speed controller circuit electroschematics. Rc snubber circuit design for triacs stmicroelectronics. The light produced by this led activates the triac and that time power is switched on.
Additional information on the use of optically coupled triac drivers is available in application note an780a. The ac bulb dimming circuit is based on the moc3021optoisolator triac driver and bta16 triac. Controlling a triac with a phototriac an5114 application note. Meaning it has a infrared light emitting diode led inside it coupled with a triac. The trigger signal is given according to an input event to the microcontroller. The brightness can be controlled using the potentiometer. When a dc supply given to the optocoupler input pins, then the internal led glow and the activate the internal triac. The simplest triac gating circuit that can be implemented is shown on figure 3. Monolithic microwave integrated circuits mmic tunable components. The proposed test method is per eianarm standard rs443.
The trigger signal is coming from a pic16f676 microcontroller. Additional information on the use of optically coupled triac drivers. I have a speed control circuit for a 230v ac motor. 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. Here the gate is the emitter of a npn bipolar transistor. Simple electronics, electronics projects, dc circuit, circuit diagram, electronic. This device is designed for use in applications requiring isolated triac triggering. It is designed for use with a triac in the interface of logic systems to equipment powered from 115 vac. The moc3021series consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon bilateral switch. 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. High current triac bta41600b datasheet, application note. The nte3048 consists of a gallium arsenide infrared emitting diode optically coupled to a silicon bilateral switch in a 6lead dip type package. Dec 22, 2018 moc3021 nte equvilent nte3048 optoisolator with triac output 6pin dip viso7500v vdrm400v. To order devices that are tested and marked per vde 0884 requirements, thesuffix v must be included at end of part number.
They are designed for use with a triac in the interface of logic systems. In fact, in many of control applications, it has replaced scr by virtue of its bidirectional conductivity. A triac, lamp load and a supply voltage are connected in series. This triac based 220v ac motor speed controller circuit is designed for controlling the speed of small household motors like drill machines. 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. Pwm input constant current power led driver schematic circuit diagram april, 2020.
Order this document semiconductor technical data by. They are designed for interfacing between electronic controls and power triacs to control resistive and inductive loads for 115 vac operations. Applications solenoidvalve controls lighting controls. Since most of the ac loads are inductive in nature, so there is often a need of the snubber circuit with moc3021 and bt6. A small pulse clock pulse with 5 v range is applied to its input that is pin 1 and pin 2. Is the value of 100 ohm 1 watt correct on pin 6 of moc3021. They are designed for interfacing between electronic controls and power triacs to control resistive and inductive loads for 115 v ac operations. 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. Dec 21, 2018 moc3021 pinout schematic circuit diagram. Apr 12, 2019 the moc3021 is a zerocrossing triac driven optocoupler.
Moc3021 light dimmer, triac bta16, zero crossing detector. Order this document semiconductor technical data by moc3020d. Moc3021 is a zerocrossing triac driven optocoupler or optoisolator. 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.
Moc3021 pdf, moc3021 description, moc3021 datasheets. 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. The speed of the motor can be controlled by changing the setting of p1. A 12012 ac transformer is used for giving power to circuit and for getting sine signal. The power supply circuit r6, r7, r10, c4, zd1, d1, and c5 supplies the microcontroller. 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. For this test, pins 1 and 2 are common, and pins 4, 5 and 6 are common. As i change the duty cycle of the pwm, it is supposed to change the intensity of the light, but it doesnt work. To switch the ac current to the lamp, we have to use an optocoupled triac, lamp and a diac is shown in circuit below.
To order devices that are tested and marked per vde 0884 requirements, the suffix v must be included at end of part number. 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. The principle used in optocoupler is, mocs are promptly available in integrated circuit form and dont require very complex circuitry to make them work. High current triac bta41600b datasheet, application. 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. The setting of p1 determines the phase of the trigger pulse that fires the triac.
The values of these passive components are calculated depending upon the load and the selection of components. Triac is semiconductor device of silicon controlled rectifier scr and works as the transistor but both are are different. The problem is the triac is getting switched on automatically sometimes when i turn on mains. 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 moc3021 is a zerocrossing triac driven optocoupler. 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. Moc3021 datasheet pdf optoisolators triac motorola. Principle of power triac drive with of a phototriac. Moc3021 datasheet, moc3021 datasheets, moc3021 pdf, moc3021 circuit.
Moc3021 and moc3022 typical applications of moc3020. When the led is triggered the triac is also turned on. Apt1221, which also protects the main triac in most cases. Compliance with the safety ratings shall be ensured by means of protective circuits. 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. 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. I am using a microcntroller to drive the optocoupler which in turn drives the gate of the triac.
Rms voltage control circuit with moc3021 and bt6 triac is a power electronic component that conducts in both directions when triggered through gate. Look at the spec sheets and it will show you how to connect it up. This paper presents a power triac phase control circuit and contrasts it with the. Moc3021 datasheet optoisolators triac driver fairchild. Moc3021 triac driven optoisolator pinout, specs, equivalent. Motor speed regulation, temperature control, illumination control, liquid level control, phase control circuits, power switches etc. Randomphase optoisolators triac driver output 400 volt peak package. Triac driving circuit with rc snubber network circuit or have fewer parts and more space on his. Simply give a small pulse at the right time to the led in the. These components may or may not be necessary depending upon the particu lar triac and load used. This module contains a triac triggering coupled with zerocrossing signal detection. For more information on how triacs and scrs operate see basic triac and scr projects and circuits. Moc3021 datasheet16 pages motorola 6pin dip random. Rc snubber circuit design for triacs introduction when a triac controls inductive loads, the mains voltage and the load current are not in phase.
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