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What is the use of semiconductor discharge tube? Semiconductor discharge tube manufacturers say

Semiconductor discharge tube manufacturers say that in the protection device, it is characterized by large current, slow response time and high impulse breakdown voltage. TVS diode has small flux, fast response time and good voltage clamping characteristics. The characteristics of the varistor are between the two; the semiconductor discharge tube conduction and breakdown voltage is accurate, the reaction speed is fast, less than 1ns. When a protection circuit requires a large total current and can achieve fine protection, the protection circuit often needs the cooperation of these protection devices to achieve the ideal protection characteristics. What is the use of semiconductor discharge tube? Semiconductor discharge tube manufacturers say.

2022

10-13

How is the selection of semiconductor discharge tube?

Semiconductor discharge tube is a common overvoltage maintenance device in modern communication equipment, which can prevent communication equipment from being damaged by lightning and surge. At present, the wires in the wired communication network are metal wires and optical fibers. The wires are installed outdoors and will inevitably be affected and destroyed by nature and man-made.

2022

10-08

What are the selection criteria for solid state relays?

When selecting solid state relays for small current specification printed circuit boards, because the lead terminals are made of high thermal conductivity materials, welding should be stopped under the conditions of temperature less than 250 ℃ and time less than 10S. If you think about the reason for the surrounding temperature, you can think about derating application if necessary, and generally control the load current within 1/3 of the rated value. When the charged load is turned on, a large surge current will be generated. Because the heat is too late to distribute, it is likely to damage the SCR inside the SSR. Therefore, the user should analyze the surge characteristics of the charged load when selecting the relay, and then select the relay. The relay can accept this surge current under the premise of ensuring steady-state operation. When selecting, refer to Table 2 for derating coefficients of various loads (at normal temperature).

2022

07-05

What is the difference between PLC control and relay contactor hardware control?

The traditional relay contactor control system is composed of three parts: input equipment (buttons, switches, etc.), control lines (connected by various types of relays, contactors, and wires to perform certain logic functions) and output equipment (contactor coils, indicator lights, etc.). This is a control system composed of physical devices. Although the ladder diagram of PLC is similar to the control circuit of relay contactor, its control components and working methods are different. The main differences are as follows. The control circuit of relay contactor with different components is composed of various hardware low-voltage electrical appliances, while the soft relays such as input relay, output relay, auxiliary relay, timer and counter in PLC ladder diagram are completed by software, not real hardware relays.

2022

06-28

How to distinguish the direction of transient suppression diodes

Commonly used maintenance device transient suppression diode TVS, DC maintenance generally uses unidirectional TVS tube, AC maintenance generally uses bidirectional TVS tube, multi-channel maintenance uses TVS array device, high-power maintenance uses TVS special maintenance module. However, compared with other direct selection applications of circuit maintenance devices, TVS diodes are still single and bidirectional before testing. Although the ultimate role is the same, but the scope of application of single bidirectional TVS diode is still different, bidirectional TVS tube is suitable for AC circuit, unidirectional TVS tube is commonly used for DC circuit. Novice engineers can't quickly identify the single and bidirectional of TVS diodes when they just contact TVS diodes. The purpose of this article is to teach you how to identify the direction of transient suppression diodes:

2022

06-21

How to distinguish between bidirectional and unidirectional SCR

The thyristor is equivalent to a diode that can be controlled. When a certain voltage is applied to the control pole, the cathode and anode are turned on. 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). 1. Discrimination of single and bidirectional thyristor: measure two poles first. If the positive and negative measurement pointers are not moved (R× 1 gear), it may be A, K or G, A pole (for unidirectional thyristor) or T2, T1 or T2, G pole (for bidirectional thyristor). 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

06-15

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