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Today, IGBT transistors are almost always used in the electronics industry, but since the procurement of these parts is often done by administrative personnel, there is a problem that the purchasing personnel do not know how to choose.

One might say, well, let the technicians do the shopping. That's true, there's nothing wrong with large businesses, but small businesses tend to rely on trusted people to do their shopping, so it's impossible to get outsiders to do it. However, if you do not understand the IGBT transistor, it does not matter, here Xiaobian to teach you several methods.

1. Look for regular manufacturers to buy

Do not know, do not understand the purchase of this part does not matter, because you just look for professional people to assist themselves. So CAN RECOGNIZE REGULAR FACTORY TO BUY, YOU WANT TO INFORM FACTORY TECHNICAL PERSONNEL OF ONESELF DEMAND ONLY, TECHNICAL PERSONNEL CAN RECOMMEND APPROPRIATE MODEL TO YOU, DO NOT NEED TO WORRY COMPLETELY.

Of course, this requires that you have to know a lot about your company, if you don't know the product needs of your company, the technical staff can't help you.

2. Select appropriate specifications

There are many kinds of IGBT transistors, if you do not understand, you can consult your company's technical staff to see what kind of parts they need, and then you can buy back much easier.

If you do not know anything, it is likely to lead to the purchase of products that do not meet the needs of the enterprise. If it is because of the enterprise's own reasons, rather than the product itself, in theory, the manufacturer will not give a refund.

Information age, do not understand the IGBT transistor can be purchased, as long as the regular manufacturers to buy, as long as you know what type of parts you need, you can easily solve the procurement problem.

Recently I read such a news, said that a company in the use of photosensitive diodes when the positive and negative electrode is wrong, resulting in product problems. To be honest, the positive and negative ranges of the parts are not clearly indicated, and it is possible to use them incorrectly. Today Xiaobian will teach you a few discrimination methods, I hope to bring help to you.

1. Test with a multimeter

This diode, like a normal diode, conducts electricity in one direction, so the forward resistance will be larger and the reverse resistance will be smaller. So if you want to know the positive and negative poles, you can use a multimeter to test.

However, pay attention to one point, because the positive and negative resistance of photosensitive diode is relatively small, so the use of R*1K resistance file can be, otherwise it may not be measured. In general, the positive resistance is 8KΩ and the negative resistance is 5MΩ.

2. How to test the special photosensitive diode

This KIND OF DIODE HAS a special specification, IS THE diode with ring grade, THIS is difficult to test, because this kind of diode positive and negative resistance is similar, sometimes difficult to judge. At this time, if you want to judge the positive and negative poles, you need to make a reverse connection, and let not too strong sunlight shine on the diode. At this time, the smaller resistance is the positive pole, and the larger resistance is the negative pole.

The above is to judge the photosensitive diode positive and negative method, is not difficult, you can easily do. Don't underestimate the negative terminal, because if the parts are not properly installed, it can cause a lot of problems.

Under normal conditions, the use of this diode can improve circuit safety, but if the positive and negative terminals are incorrectly installed, not only can not improve circuit safety, but also can reduce circuit safety. So we must learn to judge the positive and negative polarity, to avoid accidents.

Now the outbreak is not entirely in the past, for the purchase of some electronic components factory also gradually with online purchasing priority, so that can suddenly gathered numerous buyers information, able to quickly, also can delivery to the factory is more convenient, but also because of excessive purchasing information, difficult to distinguish, such as bulk purchase light coupling 3 h7 this type of components, Which manufacturer should you choose?

1, look at the details of the manufacturer

Although there are many buyers information online, but this kind of small electronic components, for the purchase quantity is required, and depending on the purchase quantity, the price also can have differences, don't choose a purchaser order directly, all the results after the arrival of the goods, such as the original is not reached up demand.

Therefore, after finding out about the optocoupler 3H7 purchasing manufacturer, we should first carefully check the product details, understand some information about the price, delivery quantity and delivery time, and then make a decision whether to buy.

2. Learn more about the strength of the manufacturer

For the manufacturers who have not cooperated, the quality of the product is very critical, in case of large quantities of procurement but the quality is not qualified, it is the wrong choice, and finally will affect the processing quality of their products, so the loss outweighs the gain.

Bulk purchase, therefore, must be careful, more information under the purchaser's qualification, can see, see how high rate is at the same time, the price is there to talk about space, as well as the distribution of time how long it would take, whether have enough stock, on the day of the delivery, if we can delivery, found that there is a problem when acceptance of the product after-sales service.

Online bulk procurement of optocoupler 3H7 electronic components, is not much easier than offline procurement, it is because you can not see, so more carefully to check the information to determine the quality, so as not to spend money in vain.

The high-speed optocoupler is usually referred to as the photoelectric coupler. It is a point photoelectric conversion device with light as a transmission signal, which belongs to the photoelectric conversion element.

1. Its rationale

The function of photoelectric coupler includes light emission, light reception and signal amplification. The electrical signal input to the coupler will be converted into a certain wavelength of light by the diode. After receiving the light, the detector will produce photocurrent, which will be output after amplification, and complete the conversion.

2. Characteristics of high-speed optocoupler

Because the coupling capacitance between the luminescent tube and the receiver is very small, the effect of the coupling capacitance on the output current is relatively small, which makes the common mode rejection ratio very high. In terms of output, its characteristics are similar to those of crystal triode. At the same time, its isolation characteristics, transmission characteristics are very good. When it is used as a linear coupler, there will be a certain delay time between the input signal and the output signal. Under the different structure of the photoelectric coupler, the delay time has a great difference, which can be selected according to the needs.

3. What are its applications

When it is used as a signal isolation interface element for computer digital communication and real-time monitoring circuit, it can increase the reliability of computer work processing and bring accurate information to the computer. When high-speed optocoupler is used in the process of long line information transmission, as a terminal isolation element, it can greatly improve the signal-to-noise ratio, make the information more accurate transmission, and reduce the influence of midway. It is often seen in various circuits. At present, it has become the most kinds of circuit components, the most widely used.

High - speed optocoupler is mainly used as a component, the specific range of use is very wide.

Optical relay is a kind of semiconductor relay which integrates light emitting device and optical receiving device and can use DC and AC. Its input side and output side have the characteristics of electrical insulation, information input and output mainly through the optical signal to carry out.

1. Type of relay

According to the specific use, it is divided into signal relay, power relay, industrial relay and power relay, etc., all kinds of relays have a special range of use. When selecting a specific relay, you can refer to its contact current and voltage, and the current and voltage when disconnected. In use, under normal circumstances, can be small power directly installed in the circuit board, a little larger will be installed in the relay seat, and then the relay seat on the standard guide rail. In the process of use, optical relay is easy to produce sparks, do not take it lightly, should pay more attention to whether the installation is standard, improve safety awareness.

2. Future prospects

At present, the most widely used optical relay is the communication relay. With the comprehensive development of communication and mobile, it also provides a good market prospect for optical relay. Relays suitable for the "Internet of Things" have excellent performance, high sensitivity and high reliability, and have become the preferred devices in many industries, which will have a great impact on the development direction of relays. Overall, the future prospects for relays are very good. As the mainstream of the development of high frequency relay will become an excellent booster of optimized communication technology, driving the development of communication field.

The types of optical relay are very wide, the market demand is also very large, as a measuring instrument, its role is difficult to replace other devices.