Opto Couplers Types And Its Applications

Opto Couplers Types
And Its Applications

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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.

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.

Applications
Opto Couplers Module
 SCR, photodiodes.
 TRIAC of other semiconductor switch as an output
 Incandescent lamps.
 Neon bulbs or other light source.

Applications
Opto−Diacs
 The 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.

Applications
Opto-Diacs Pin Description

Applications
4 Different Opto Couplers Available
1. MOC3020
2. MOC3021
3. MCT2E
4. MOC363

Applications
MOC3020
 MOC3020 Opto Couplers comes in 6-pin DIP

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 Opto-coupler is, MOC’s.
 It is promptly available in integrated circuit form.

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.

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.

Applications
Typical applications of MOC3020
 Solenoid/valve controls
 Lamp ballasts
 Interfacing microprocessors to 115/240 Vac peripherals
 Motor controls
 Incandescent lamp dimmers

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

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

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

Applications
Applications of MOC3021
 Lamp ballasts
 Interfacing microprocessors to 115/240 Vac peripherals
 Motor controls
 Incandescent lamp dimmers

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.

Applications
MCT2E Pin Description
 Pin 1: Anode.
 Pin 2: Cathode.
 Pin 3: No connection.
 Pin 4: Emitter.
 Pin 5: Collector.
 Pin 6: Base.

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

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.

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.

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

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

Applications
MOC363 Applications
 Static power switches
 Temperature controls
 AC motor starters and drivers
 Lighting controls
 E.M. contactors
 Solid state relay

Applications
Working of MOC3063
 From the circuit, we have an opto-coupler MOC3063 with
an LED SCR type combination.

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.

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

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

Opto Couplers Types And Its Applications

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