How does an optocoupler work

If you enjoy watching my videos, please show your support by SUBSCRIBING,. Optocoupler concept is explained in this video tutorial. The light produced by the LED activates the light sensitive properties of the diac and the power is . A full selection of optocouplers that can be used for optocoupler circuits such as an analog optocoupler , ac input, optical optocoupler , high voltage, fast, linear or high speed optocoupler.

The following explanation considers the maximum output current.

How much input current (IF) is required to .

But for simple work with, say, an Arduino, the circuit is nearly what you would do.

Opto coupler are designed to provide complete electrical isolation between an input and output circuits. The useful purpose of isolation is to provide protection from high voltage, surge voltage and low level noises that could be produces errors in the output. Therefore, especially working with high speed digital electronics, the bandwidth of your optocoupler choice does need to be taken into account. Thus ends the introduction to optocouplers. I hope you understood and can apply what we have discussed today.

In the meanwhile have fun and keep checking . Scope (with proper insulation transformer) the voltage on the LED. This is the Vr in the datasheet. So if the power to the input is change this does not affect the power on the output, and vice versa.

How optocouplers work is they provide isolation through an IR LED and phototransistor. And how it works is we give enough power to the anode and cathode pins, so that the LED is sufficient power to turn on. THIS DOCUMENT IS SUBJECT TO CHANGE. All that needs to be done is to work the corresponding limit values VIH, VOH, IIL, IOL, . Did you reffer to isolation resistance when you mention some phototransistors have high resistance?

How to identify your optocoupler pin details with Digital Multimeter? Such stabilizers are serial devices. The comparing element is an LED. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation . What Isolation Voltage do you require? What Transfer Speed do you require?

How many channels do you need to isolate? What Operating Temperature do you require? What are your creepage distance requirements?

Accordingly, when the LED does not light up, the phototransistor is cutting off, and when the LED lights strongly, a large photocurrent flows from the collector to the base and the phototransistor is turned . It seems you have it hooked up right. As an isolator, an optocoupler can prevent high voltages from affecting the side of the circuit receiving the signal.