AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Symbol of isolator switch9/2/2023 ![]() ![]() It shows how quickly the optocoupler changes its output. Response time is the time taken to update the output after a change in the input. It is calculated in V RMS at medium humidity of around 50%. It is the maximum voltage or potential difference that can exist between its input and output workout causing any damage to the insulation. The following characteristics define the performance of the optocoupler. This mode is used as an amplifier where the input current is amplified into the output of the phototransistor. Where the light intensity depends on the input current. In linear or Active mode, the output current is directly proportional to the intensity of the incident light. This mode is used to switch ON/OFF high power circuits using a microcontroller or digital logic circuit. In the ON state, it allows full current through it while the OFF state fully blocks the current flow. In saturation mode, the optocoupler is used as a switch that has two states ON state and OFF state. ![]() The phototransistor can operate in two modes Saturation Mode Therefore the input current at the low voltage side can control the current flow in the high voltage circuit without any electrical connection. The amount of current depends on the intensity of light whereas the light intensity depends on the current supply to LED. The phototransistor converts the light into the current that controls the current flow between its emitter and collector. The IR light strikes the phototransistor. A resistor in series is used to limit the current flowing through the LED. The intensity of light depends on the supply voltage and current. When current flows through the LED, it emits infrared IR light. While the phototransistor is connected with the output supply and load as shown in the figure below. The LED is connected to the input supply with a series resistor. Difference Between Photodiode and PhototransistorĪs we know that the internal structure of optocoupler consists of LED and phototransistor.While the phototransistor is at the output side connected with the high voltage circuit. ![]() The LED is at the input side connected with the low voltage circuit. The space between them is filled with glass, air, or transparent epoxy resin that has very high electrical resistance but easily passes light. The LED is used as a light source while the phototransistor is used as a light sensor. It is generally made of LED and phototransistor. Optocoupler is made of semiconductor material. It prevents high hazardous voltage flow between circuits, and rectify noise and other distortions between the circuits. There is no physical contact between the circuits but the circuit can be coupled together to transfer energy by other means such as magnetic coupling (transformers) and Opto-coupling using light (optocouplers) etc.Įlectrical Isolation is used to prevent unwanted current flow between two circuits. ![]() But have you ever wondered how something so sensitive operating at very low voltage can control such large voltage? The answer is an optocoupler based on “electrical Isolation”.Įlectrical isolation means the introduction of a non-conducting material between the circuits to prevent the direct flow of current. is used to control or regulate high power flow. In electrical and electronic engineering, we often come up with certain circuits where a digital logic circuit such as a microprocessor or microcontroller, etc. Optocoupler or Opto-isolator, Symbol, Construction, Working, Types and Applications ![]()
0 Comments
Read More
Leave a Reply. |