5SHY35L4520 5SHY series ABB SCR IGCT card

5SHY35L4520 5SHY series ABB SCR IGCT card

Article number :5SHY35L4520
Communication protocol ABB’s DriveBus
Master or slave Master
Transmission speed 8 Mbit/s
Line redundancy No
Module redundancy No
Hot Swap Yes
Used together with HI Controller No

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SCR can be divided into spiral type, flat type and flat-bottomed type in terms of appearance, and spiral type is widely used. SCR has three electrodes – anode (A) cathode (C) and control electrode (G). It has a four-layer structure composed of P-type conductor and N-type conductor, and has three PN junctions. The structure of thyristor and silicon rectifier diode with only one PN junction is very different. The four-layer structure of silicon controlled rectifier and the use of control poles lay the foundation for its excellent control characteristics of “controlling large by small”. When applying silicon controlled rectifier, as long as a small current or voltage is applied to the control electrode, a large anode current or voltage can be controlled. Thyristor element with current capacity of hundreds of amperes to thousands of amperes. Generally, the SCR with less than 5 amperes is called low-power SCR, and the SCR with more than 50 amperes is called high-power SCR.

Voltage measurement method

Why does SCR have the controllability of “controlling large by small”? Next, we will use Chart – 27 to briefly analyze the working principle of SCR.

First of all, the first, second and third layers from the cathode up can be seen as one NPN transistor, while the second and third layers form another PNP transistor. The second and third layers are shared by two pipes. When a positive voltage Ea is applied between the anode and cathode, and a positive trigger signal is input between the control electrode G and the cathode C (equivalent to the base beam of BG1), BG1 will generate the base current Ib1. After amplification, one of BG1 will be amplified β One time of collector current IC1. Because BG1 collector is connected to BG2 base, IC1 is the base current Ib2 of BG2. BG2 magnifies the ratio of Ib2 (Ib1) β The collector current IC2 of 2 is sent back to the base of BG1 for amplification. In this way, the loop is amplified until BG1 and BG2 are fully connected. In fact, this process is a “trigger triggered” process. For the thyristor, the trigger signal is added to the control pole, and the thyristor is immediately turned on. The conduction time is mainly determined by the performance of thyristor.