Opto Couplers Types And Its Applications

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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.

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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.

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Opto Couplers Types And Its Applications
Opto Couplers Module 

• SCR, photodiodes.
• TRIAC of other semiconductor switch as an output
• Incandescent lamps.
• Neon bulbs or other light source.

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Opto Couplers Types And Its 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.

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Opto Couplers Types And Its Applications
Opto-Diacs Pin Description
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Opto Couplers Types And Its Applications
4 Different Opto Couplers Available
1. MOC3020 2. MOC3021 3. MCT2E 4. MOC363
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Opto Couplers Types And Its Applications
MOC3020

• MOC3020 Opto Couplers comes in 6-pin DIP

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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 Opto-coupler is, MOCs.
• It is promptly available in integrated circuit
  form.

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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.

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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.

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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

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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

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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

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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

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Opto Couplers Types And Its Applications
Applications of MOC3021

• Solenoid/valve controls
• Lamp ballasts
• Interfacing microprocessors to 115/240 Vac
  peripherals
• Motor controls
• Incandescent lamp dimmers

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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.

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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.

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Opto Couplers Types And Its Applications
MCT2E Features

• Isolation test voltage 5000 VRMS
• Interfaces with common logic families
• Input-output coupling capacitance lt 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

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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
  doesnt fall on transistor so it doesnt 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.

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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.

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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
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Opto Couplers Types And Its Applications
MOC363 Features

• Simpli?es 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

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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

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Opto Couplers Types And Its Applications
Working of MOC3063

• From the circuit, we have an opto-coupler MOC3063
  with an LED SCR type combination.

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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.

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Opto Couplers Types And Its Applications
Application Of Opto Couplers

• 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.

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Opto Couplers Types And Its Applications
Conclusion

• 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. 

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