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Coupler is also called adapter
\ Principle and Application of Optocoupler
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Photocoupler is a kind of electrical-optical-electrical conversion device that transmits electrical signals as a medium. It consists of two parts: a luminous source and a light receiver. The light-emitting source and the light-receiver are assembled in the same airtight housing, separated from each other by a transparent insulator. The pin of the light-emitting source is the input terminal, the pin of the light receiver is the output terminal, the common light-emitting source is a light-emitting diode, and the light receiver is a photodiode, a phototransistor, and so on. There are many types of photoelectric couplers, such as photodiode type, phototransistor type, photoresistor type, light-controlled thyristor type, photoelectric Darlington type, integrated circuit type and so on. As shown in Figure 1 below（There are metal round shell package, plastic package double in-line, etc.）.
\ working principle
\ Apply an electrical signal to the input of the photocoupler to make the light emitting source emit light. The intensity of the light depends on the size of the excitation current. After this light is irradiated on the packaged light receiver, a photocurrent is generated due to the photoelectric effect, which is output by the light receiver Terminal leads, so that the conversion of electricity to light to electricity is realized.
\ Basic working characteristics（Take the photosensitive transistor as an example）
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1. High common mode rejection ratio
\ Inside the optocoupler, because the coupling capacitance between the luminous tube and the light receiver is very small（Within 2pF）Therefore, the common-mode input voltage has little effect on the output current through the inter-electrode coupling capacitor, so the common-mode rejection ratio is very high.
\ 2. Output characteristics
\ The output characteristic of the photocoupler refers to the relationship between the bias voltage VCE applied by the photosensitive tube and the output current IC under a certain light-emitting current IF. When IF=0, the light-emitting diode does not emit light. At this time, the phototransistor set The electrode output current is called dark current, which is generally very small. When IF>0, under the action of a certain IF, the corresponding IC basically has nothing to do with VCE. The change between IC and IF becomes a linear relationship, and the output characteristic of the photoelectric coupler measured by the semiconductor tube characteristic diagram instrument is similar to the output characteristic of the ordinary transistor.
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3. The photoelectric coupler can be used as a linear coupler.
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Provide a bias current on the light-emitting diode, and then couple the signal voltage to the light-emitting diode through a resistor, so that the phototransistor receives an optical signal that increases or decreases on the bias current, and its output current will follow the input signal The voltage changes linearly. The photocoupler can also work in the on-off state to transmit pulse signals. When transmitting a pulse signal, there is a certain delay time between the input signal and the output signal, and the input and output delay times of photocouplers of different structures are very different.
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Shuangyuan Optoelectronic Device Factory is a high-tech enterprise specializing in providing optical fiber solutions.
\ Our company focuses on the design, production and sales of optical fiber series products. Products are developed in strict compliance with relevant international standards. The company always pays attention to international and domestic technologies and grasps the dynamics of optical communication technology; shares the scientific research results of optical fiber communication with customers with high technology, quality and service. The main products are: optical fiber patch cords, optical fiber adaptersSupport various customization
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Fight for price, and even more for quality!
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Product Features:
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Long-distance and local optical transmission network, data transmission network, image transmission network, CATV, optical test equipment, photoelectric automatic control system
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Features:
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The product uses Japan Kyocera''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s ceramic pins and imported high-quality optical fiber cables.
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The introduction of foreign advanced grinding technology and grinding equipment can effectively ensure that the optical fiber center grinding deviation, the optical fiber''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s dent, the optical fiber surface has no scratches or flaws, and the ceramic end surface curvature radius and other technical parameters meet the standard requirements.
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The insertion loss is small, the return loss is large; the interchangeability, the repeated plugging performance is excellent, and the use is convenient.
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The company''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s available products include ST, SC, FC, LC, MU, D4, SM4, FDDI, MT-RJ and other indicators.
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Specifications include single-mode single-core, multi-mode dual-core, etc.
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Factory direct shipments, no second link, large quantity and excellent price!
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It can be sent on behalf of one piece, and the quantity can be directly photographed. The price is what our factory fights, and of course the quality will not be bad! Hey~~~
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Buyers must-read
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Please confirm the delivery time with the customer service before ordering. For customers of customized lines, please confirm the type, joint and length of the line with the customer service to avoid return. It will cause losses to both parties.
\ Once you need to change the consignee or the receiving address, please contact us in time, because our delivery speed is very fast, generally on the day of your order or the next day, we have prepared for you to change as soon as possible, otherwise we will not be liable The logistics costs incurred.
\ If you do not contact the customer service and take the picture and pay the customer, we will contact you to reconfirm the consignee and address to deliver the goods for you. If the contact phone cannot be connected, we will default to the product and quantity you took in two days. Shipment.
\ For customers who need to make an urgent order, we can open an express channel for you. Generally, delivery can be made at the time you require without any additional fees. Welcome to contact our customer service or call our order hotline:15958207047Postage instructions
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contact details
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contact number:15958207047 Holidays, welcome to inquire
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