What’ application of Thyristor surge protectors?
Thyristor protector is widely applied in Modems, POS systems, fax machines, analog and digital line cards, PBX systems, digital set-top boxes, subscriber line interface circuit, telephone, telecommunications equipment and other users, network equipment.
What are the main parameters of thyristor surge protectors?
What is the working principle of the thyristor surge protector?
Thyristor surge protection device is a two-way symmetric SCR tube, using short circuit launch as PNPN cathode structure, in normal status, the thyristor is closed, the current in the discharge tube is very small (uA ), can be considered as "turn off", and the current flows to the protected circuit. But once the surge occurred and the surge voltage is higher than the turn voltage VBO, there will be a low voltage high current circuit in the discharge tube, or in the status of "short circuit". Then all the surge current will be released through thyristor, and voltage imposed in the protected circuit is the same value on the thyristor, thereby protect the circuit. When the surge current weakened to lower than holding current IH, the tyristor return to closed status.
What’s the reason for Voltage Transient and Surge ?
Why apply the thyristor surge protectors in the circuit?