What is the purpose of optocouplers?
An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal.
How reliable are optocouplers?
The LED in Broadcom optocouplers, unlike inferior phototransistors, has excellent reliability performance (< 10% drop) over 30 years of field operation. The LED long lifetime gives designers greater flexibility when selecting optocouplers for their application.
What is MOC3020?
The MOC3020 are designed for interfacing between electronic controls and power triac to control resistive and inductive loads for Vac operations. The principle used in opto-coupler is, MOC’s are promptly available in integrated circuit form and don’t require very complex circuitry to make them work.
What are the applications of optocouplers?
Optocoupler Applications. Common applications for opto-couplers include microprocessor input/output switching, DC and AC power control, PC communications, signal isolation and power supply regulation which suffer from current ground loops, etc. The electrical signal being transmitted can be either analogue (linear) or digital (pulses).
What are the advantages of opto-couplers?
The main advantage of opto-couplers is their high electrical isolation between the input and output terminals allowing relatively small digital signals to control much large AC voltages, currents and power.
How does a phototransistor optocoupler work?
Phototransistor Optocoupler. Current from the source signal passes through the input LED which emits an infra-red light whose intensity is proportional to the electrical signal. This emitted light falls upon the base of the photo-transistor, causing it to switch-ON and conduct in a similar way to a normal bipolar transistor.
What is a TRIAC based opto-coupler?
In the upper image the internal construction or the TRIAC based opto-coupler is shown. TRIAC is mainly used where AC based control or switching is needed. The led can be controlled using DC, and the TRIAC used to control AC. Opto-coupler provide excellent isolation in this case too. Here is one Triac Application.