1. Introduction to Optocouplers
When an electrical signal is applied to the input end, the light emitter emits light, and after the light receiver receives the light, it generates a photocurrent, which flows out from the output end, thus realizing the "electricity-optical-electricity" conversion, also called optical isolation. There are many types of photocouplers, such as photodiode type, phototransistor type, photoresistor type, light-controlled thyristor type, photoelectric Darlington type, integrated circuit type and so on.
2. Internal structure of optocoupler
Photoelectric coupling device (abbreviated as optocoupler) is to assemble a light-emitting device (such as a light-emitting diode) and a photosensitive device (such as a photosensitive triode) together to form an electric-optical and optical-electric conversion device through the coupling of light.
3. The role of optocoupler
4. Working principle of optocoupler
(1) The input impedance of the optocoupler is very small, only a few hundred ohms, while the impedance of the interference source is relatively large, usually 105-106Ω. According to the principle of voltage division, even if the amplitude of the interference voltage is large, the noise voltage fed to the input of the photocoupler will be very small and can only form a very weak current. Because there is not enough energy to make the diode emit light, So it was suppressed.
(2) There is no electrical connection between the input circuit and the output circuit of the photocoupler, and there is no common ground; the distributed capacitance between them is extremely small, and the insulation resistance is very large, so various interference noises on one side of the circuit are difficult Feeding to the other side through the photoelectric coupler avoids the generation of interference signals of common impedance coupling.
(3) The photoelectric coupler can play a very good role in safety protection, even when the external equipment fails, or even the input signal line is short-circuited, it will not damage the instrument. Because the input circuit and output circuit of the optical coupling device can withstand a high voltage of several thousand volts.
(4) The response speed of the photoelectric coupler is extremely fast, and its response delay time is only about 10μs, which is suitable for occasions that require high response speed.
Huaqiang Xincheng recently introduced a batch of Orende optocoupler products. As a domestic brand, Orende optocoupler has an excellent reputation in the market. At present, Orende's optocoupler has been put on the shelves in Huaqiang Core City, friends in need can find out.
1. Orient Optocoupler Advantages
1) Relative advantages of foreign and Taiwanese companies (Toshiba, Lite-On)
â‘ Unique low-current drive: common companies use 0.5mA current drive, and the current can be driven at 0.1mA;
â‘¡Price advantage: The price of foreign companies is generally higher, and the price is more powerful under the premise of ensuring quality.
2) Advantages relative to domestic enterprises
â‘ Quality: Lund Optocoupler 817 uses self-produced infrared chips, which can work normally in a working environment with a large temperature difference;
â‘¡ Capacity: 80kk monthly output.
2. Types of Orient Optocouplers
Orland recently launched new products of thyristor and high-speed optocoupler. Among them, the thyristor series are complete, and the self-developed chips can be replaced with imported Toshiba and other brands; high cost performance, excellent experience of service and technical support, and customization.
1) Thyristor
The alternative models of SCR are as follows:
2) High-speed optocoupler
Isolation + high speed (faster response time).
3. Application of Orient Optocoupler
Optocouplers are widely used in industrial products, charging piles, power supplies & photovoltaic products, and data center products.
1) Motor controller
2) Electric vehicle charging pile
The digital high-speed isolation optocoupler isolates and insulates the weak part of the charging pile (including the control part) from the external port. On the one hand, it prevents the weak part of the charging pile (including the control part) from being disturbed, and on the other hand, it prevents the communication information from being disturbed and guarantees information. Signal integrity.
3) Data center products
SVC (Static Var Compensator) reactive power compensation equipment; SSR.
4) Printer
PLC programmable logic controller, recommended part number: 6N137, OR0630
5) Elevator control panel
6) Fan
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