Photoelectric products are an indispensable device in our modern life, and it brings a lot of convenience to our lives. Optoelectronic products can be used normally, and it is inseparable from optoelectronic devices. Optocouplers are such a very important optoelectronic device. However, Xiao Bian believes that most readers and friends are not very familiar with the principle and function of the optocoupler. The following small series will introduce the relevant knowledge of the optocoupler in detail, and hope to lead everyone to understand the principle and function of this device.
Introduction to optocoupler
What is a photocoupler? It is a photoelectric conversion component that uses light as its main medium, which can realize the conversion from light to electricity and then from electricity to light. Photocouplers are also called opto-isolators. It can provide good isolation for the electrical signals in the circuit, especially in the circuit of illumination, it can effectively protect the circuit and the wire, so that the optical signal and the electrical signal do not interfere with each other, and work separately to ensure The power supply and the light source are normally in orderly working, and have good electrical insulation capability and anti-interference ability. There are many types of optocouplers commonly found in life, such as photodiodes, triodes, photoresistors, and light-controlled thyristors, which are very good optocouplers.
Optocoupler principle
So what is the working principle of the optocoupler? To understand the principle of the optocoupler, we must first understand its components. The optocoupler is mainly composed of two parts, namely a light source and a light receiver, and the components of the two parts are simultaneously in a closed space, and are separated from each other by an insulated transparent casing. The way the current works is the input port of the light source, from which the current enters. The output port of the receiver is used as the output, and the current is output from here. When a current enters the illuminating source, the illuminating element is illuminated by the current, and the brightness of the light changes due to the magnitude of the input current. When the light is on the receiver, the receiver reacts and the current is output from it to become the photocurrent.
So what is photocurrent? It is a signal with photoelectric characteristics at the same time. When this signal propagates to the receiver, the receiver will output a corresponding amount of current according to the illumination intensity of the photocurrent, and these currents will return to the circuit. A closed circuit is formed. In this case, the light source portion of the photocoupler will emit light, and the current will not interfere with the operation of the light source, so the illumination of the photocoupler is very stable and safe. This is how the optocoupler works. I don’t know if the readers understand it.
The role of optocoupler
The optocoupler is mainly used in various circuits, and can protect the state of the current and protect the circuit. According to its characteristics, people use optocouplers to make controllable photoelectric switches, which can play a very good control and voltage regulation function for switching circuits and high voltage circuits, and provide many conveniences for people's use.
There are many types of optocouplers, each of which has its own characteristics, and they have their own applicable range. If we want to buy optocouplers, we must first understand the scope of application of different types of optocouplers. Parameter indicators, and then choose the right type according to your needs, in order to be able to purchase the optocoupler products you need. The knowledge of the optocoupler has been introduced to everyone. Have you already understood about it?
Optocoupler related article: What are the characteristics and uses of optocouplers (working principle, typical application and internal structure)
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