Opto Couplers Types And Its Applications

Opto-isolators or Opto-couplers, are made up of a light emitting device, and a light sensitive device, all wrapped up in one package, but with no electrical connection between the two, just a beam of light. Find different types of Opto couplers and its applications.

1. Opto Couplers Types And Its Applications

2. http://www.elprocus.com/ Opto Couplers Types And Its Applications Introduction: A lot of electronic equipment nowadays is using opt coupler in the circuit. An opt coupler or sometimes refer to as opt isolator allows two circuits to exchange signals yet remain electrically isolated. This is usually accomplished by using light   to relay the signal. The standard opt coupler circuits design uses a LED shining on a phototransistor-usually it is a NPN transistor and not PNP. The signal is applied to the LED, which then shines on the transistor in the IC.

3. http://www.elprocus.com/ Opto Couplers Types And Its Applications What is Opto-Isolators or Opto-Couplers Opto-isolators or Opto-couplers, are made up of a light emitting device, and a light sensitive device, all wrapped up in one package, but with no electrical connection between the two, just a beam of light. The light emitter is nearly always an LED. The light sensitive device may be a photodiode, phototransistor, or more esoteric devices such as thyristors, TRIACs etc.

4. http://www.elprocus.com/ Opto Couplers Types And Its Applications Opto C ouplers M odule   SCR, photodiodes. TRIAC of other semiconductor switch as an output I ncandescent lamps. Neon bulbs or other light source.

5. http://www.elprocus.com/ Opto Couplers Types And Its Applications Opto−Diacs T he Opto-Diacs are available in form of ICs and can be implemented using a simple circuitry . Simply provide a small pulse at the right time to the Light Emitting Diode in the package.  The light produced by the LED activates the light sensitive properties of the diac and the power is switched on.  The isolation between the low power and high power circuits in these optically connected devices is typically several thousand volts.

6. http://www.elprocus.com/ Opto Couplers Types And Its Applications Opto-Diacs Pin Description

7. http://www.elprocus.com/ Opto Couplers Types And Its Applications 4 Different Opto Couplers A vailable 1. MOC3020 2. MOC3021 3. MCT2E 4. MOC363

8. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC3020 MOC3020 Opto Couplers comes in 6-pin DIP

9. http://www.elprocus.com/ Opto Couplers Types And Its Applications Working Principle of MOC3020 The MOC3020 are designed for interfacing between electronic controls and power triac. It is used to control resistive and inductive loads for Vac operations . The principle used in O pto-coupler is, MOC’s. It is promptly available in integrated circuit form.

10. http://www.elprocus.com/ Opto Couplers Types And Its Applications Working Principle of MOC3020 To work the circuit give a small pulse at the right time to the LED in the package. The light produced by the LED activates the light sensitive properties of the diac and the power is switched on.  The isolation between the low power and high power circuits in these optically connected devices is typically few thousand volts.

11. http://www.elprocus.com/ Opto Couplers Types And Its Applications Features of MOC3020 400 V Photo-TRIAC Driver Output. Gallium-Arsenide-Diode infrared source and optically-coupled silicon triac driver. High isolation – 500 Vpeak . Output driver designed for 220 Vac. Standard 6-terminal plastic DIP. Directly interchangeable with Motorola MOC3020, MOC3021 and MOC3022.

12. http://www.elprocus.com/ Opto Couplers Types And Its Applications Typical applications of MOC3020 Solenoid/valve controls Lamp ballasts Interfacing microprocessors to 115/240 Vac peripherals Motor controls Incandescent lamp dimmers

13. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC3021 MOC3021 is an opto-coupler designed for triggering TRIACS. By using this we can trigger anywhere in the cycle, so can call them as non-zero opto-coupler. MOC3021 are very widely used and can be quite easily obtained from many sources. It comes in 6-pin DIP

14. http://www.elprocus.com/ Opto Couplers Types And Its Applications Pin Description MOC3021 Pin 1: Anode Pin 2: Cathode Pin 3: No connection (NC) Pin 4: Main terminal Pin 5: No connection (NC) Pin 6: Main terminal

15. http://www.elprocus.com/ Opto Couplers Types And Its Applications Features 400 V Photo-triac driver output. Gallium-Arsenide-Diode Infrared Source and Optically-Coupled Silicon triac driver. High Isolation 7500 V Peak. Output Driver Designed for 220 Vac. Standard 6-terminal plastic DIP

16. http://www.elprocus.com/ Opto Couplers Types And Its Applications A pplications of MOC3021 Solenoid/valve controls Lamp ballasts Interfacing microprocessors to 115/240 Vac peripherals Motor controls Incandescent lamp dimmers

17. http://www.elprocus.com/ Opto Couplers Types And Its Applications MCT2E The MCT2E series of opto -coupler devices each consist of gallium arsenide infrared LED and a silicon NPN phototransistor. They are packaged in a 6-pin DIP package and available in wide-lead spacing.

18. http://www.elprocus.com/ Opto Couplers Types And Its Applications MCT2E Pin Description Pin 1: Anode. Pin 2: Cathode. Pin 3: No connection. Pin 4: Emitter. Pin 5: Collector. Pin 6: Base .

19. http://www.elprocus.com/ Opto Couplers Types And Its Applications MCT2E Features Isolation test voltage 5000 VRMS Interfaces with common logic families Input-output coupling capacitance < 0.5 pF Industry standard dual-in-line 6 pin package Compliant to RoHS directive 2002/95/EC The opto -coupler usually found in switch mode power supply circuit, read relay driving, industrial controls, digital logic inputs and in many electronic equipments

20. http://www.elprocus.com/ Opto Couplers Types And Its Applications Application of MCT2E It is a combination of 1 LED and a transistor. Pin 6 of transistor is not generally used and when light falls on the base-emitter junction then it switches and pin5 goes to zero . When logic zero is given as input then the light doesn’t fall on transistor so it doesn’t conduct which gives logic one as output . When logic 1 is given as input then light falls on transistor so that it conducts, that makes transistor switched ON and it forms short circuit this makes the output is logic zero as collector of transistor is connected to ground.

21. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC363 The MOC3063 devices consist of gallium arsenide infrared emitting diodes optically coupled to monolithic silicon detectors performing the functions of zero voltage crossing bilateral triac drivers. It is also a 6-pin DIP.

22. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC363 Pin Description Pin 1:  Anode Pin 2:  Cathode Pin 3:  No connection (NC) Pin 4:  Main terminal Pin 5:  No connection (NC) Pin 6:  Main terminal

23. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC363 Features Simplifies logic control of 115/240 Vac power Zero crossing voltage dv/ dt of 1500 V/µs typical, 600 V/µs guaranteed VDE recognized Underwriters Laboratories (UL) recognized

24. http://www.elprocus.com/ Opto Couplers Types And Its Applications MOC363 Applications Solenoid/valve controls Static power switches Temperature controls AC motor starters and drivers Lighting controls E.M. contactors Solid state relay

25. http://www.elprocus.com/ Opto Couplers Types And Its Applications Working of MOC3063 From the circuit, we have an opto -coupler MOC3063 with an LED SCR type combination.

26. http://www.elprocus.com/ Opto Couplers Types And Its Applications Working of MOC3063  Additionally while using this Opto-coupler with microcontroller and one LED can be connected in series with MOC3063 LED to indicate when high is given from micro controller such that we can know that current is flowing in internal LED of the Opto-coupler . When logic high is given then the current flows through LED from pin 1 to 2. The LED light falls on SCR causing 6 and 4 to close only at the zero cross of the supply voltage. During each half cycle current flows through SCR gate, external series resistor and through SCR for the main thyristor/ triac to trigger for the load at the beginning of the supply cycle always to operate.

27. http://www.elprocus.com/ Opto Couplers Types And Its Applications The opto coupler usually found in switch mode power supply circuit in many electronic equipment. It is connected in between the primary and secondary section of power supplies. The opto-coupler application or function in the circuit is to : Monitor high voltage. Output voltage sampling for regulation. System control micro for power ON/OFF. Ground isolation . Application Of Opto Couplers

28. http://www.elprocus.com/ Opto Couplers Types And Its Applications Most commonly used is an opto-coupler MOC3021 an LED diac type combination. This IC is interfaced with a microcontroller and an LED is connected in series to the IC, which glows to indicate a logic High pulse from the microcontroller so that we can know that current is flowing in internal LED of the opto-IC.  Conclusion

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