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Why install a radiator for solid state relays?

Why do solid-state relays and SCR modules need radiators? Since both of them use SCR as the main overcurrent device and SCR is a power device, there is a certain conduction voltage drop, that is, conduction resistance, in use. Therefore, heat is generated and cannot be distributed in time. SCR will be damaged quickly and cannot be recovered. Therefore, all the loads with a certain current should be equipped with radiator plates, and air cooling and water cooling should be added when necessary. The calorific value of the solid state relay or module is mainly related to the practical current of the driven load, but has little to do with its own current level.

2022

04-19

What types of transistors are there?

Transistor is composed of three layers of impurity semiconductor devices, there are three electrodes, so also known as semiconductor transistor, transistor, etc., can be used for detection, rectification, amplification, switching, voltage regulator, signal modulation and many other functions. The low cost, sensitivity and robustness of transistors make them ubiquitous devices. Transistor mechatronics circuits have become electromechanical equipment control equipment to control the machine. Microcontrollers and computer programs are increasingly convenient for control systems compared to mechanical control systems. So what are the varieties of transistors? Take a look at below:

2022

04-14

What are the precautions for the use of solid state relays?

When selecting solid state relays, we should analyze the corresponding conditions, research manuals, detailed standards and product technical performance and parameters. At the same time, we should note that the performance parameters and load of solid state relays can be greatly affected by ambient temperature and its own temperature. Its input has polarity request. When rational and capacitive loads are used, the output circuit is easily damaged by sharp seal voltage and surge current, power loss and heat dissipation caused by the on-state voltage drop. Focus on dealing with these problems, help to complete the scientific application of solid state relay, make it more reliable.

2022

04-08

How to use multimeter to detect SCR?

The controllable silicon is divided into two kinds, which are three electrodes. The unidirectional thyristor has a cathode (K), an anode (A), and a control pole (G). The bidirectional thyristor is equivalent to two single thyristors in reverse parallel. That is, one of the one-way silicon anodes is connected to the other cathode side, its leading end is called T2 pole, one of the one-way silicon cathodes is connected to the other anode, its leading end is called T2 pole, and the rest is the control pole (G). Discrimination of single and bidirectional thyristors: first measure two poles. if the positive and negative measurement pointers do not move (r× 1 gear), it may be a, k or g, a (for bidirectional thyristors) or T2, T1 or T2, g (for bidirectional thyristors). If one of the measurement instructions is tens to hundreds of ohms, it must be a one-way thyristor. And the red pen is connected to the K pole, the black pen is connected to the G pole, and the rest is the pole. If the positive and reverse measurement instructions are tens to hundreds of ohms, it must be a two-way thyristor. Then turn the knob to R× 1 or R× 10 gear for retest, one of which must have a slightly larger resistance value, then the slightly larger red pen is connected to G pole, the black pen is connected to T1 pole, and the rest is T2 pole.

2022

03-29

What are the main causes of thyristor breakdown?

Overvoltage breakdown is one of the main reasons for thyristor breakdown. There is no time for thyristor to accept overvoltage. Even in a short time of a few milliseconds, overvoltage will be broken down. Therefore, in practical application circuits, RC absorption circuits must be connected at both ends of thyristor to prevent sudden overvoltage caused by various irregular interference pulses. If thyristor breakdown occurs frequently, please check whether the components of the absorption circuit can be burnt out or fail.

2022

03-24

Electric fish silicon controlled easy burst tube and what is the cause of the error?

The common errors in the use of electric fish are as follows: 1. State error; 2. Hardware error; 3. System error; 4. Line error; 5. Power supply error. As a common fish catcher accessories, the quality of its convergence function directly affects the size of the output effect of the fish catcher and the up and down of the pulse frequency. This paper summarizes the common situations that can not be used by electric fish products caused by thyristor's own questions, and presents you with the most comprehensive fish catcher thyristor question handling plan.

2022

03-20

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