Photoelectric coupling component
196
2023-08-01
Photoelectric coupling component
The summary diagram of the LED and photoelectric coupling components, the left is the light source (LED), the middle is the blocking medium, and the sensor on the right is the sensor (optical transistor)
The photoelectric coupling component is a set of devices that transmit the electrical signal with light (including visible light, infrared, etc.) as a medium [1]. Its function is to separate the input circuit and output circuit.Layer transmission method.Optical coupling component (English: Optical Coupler, or English: Photo Coupler), also known as an optocoupler, optical isolationer, and photoelectric isolation, referred to as optocoupler.
Optical coupling components can pass signals between the two incompetence circuits, and even if there is high voltage between the two circuits, it will not affect it. [2]Commercial photoelectric coupling components can input the output to 10 KV [3], and the voltage change rate can be as fast as 10 kV/μs [4].
Optical coupling components can be divided into two types: analog and numbers, both consisting of photocarcas and photocutinals.The optical transmitter and the optical detector are usually integrated into the same packaging, but there will be no electrical or physical connection except the beam.
Common photoelectric coupling components are placed in an opaque package in an opaque packaging.Other combinations include LED-photoelectric diode, LED-LASCR and light bulb-optical resistance.Optical coupling components generally transmit digital signals, but with some technologies, they can also use photoelectric coupling components to transmit analog signals.
Optical coupling components are widely used in electrical isolation, level conversion, driving circuits and industrial communication, but because of parasitic input and output capacitance problems, its common modulus transient suppression (Common-Mode Transient Immunity) is weak. In addition, its speed is subject toThe high power consumption of the optical coupling component, and the prone to aging components is a problem.
