Thyristors are semiconductor devices with special switching characteristics that can be switched on and off quickly under high current and high voltage conditions to achieve precise control of electrical energy. The working principle is based on the unidirectional conductivity of the semiconductor PN junction and the trigger control of the gate, so that the thyristor remains in a low resistance state after conduction until the current drops below the maintenance current or the gate signal is cancelled. Thyristors are widely used in power electronic systems requiring high current control because of their strong power processing ability, high efficiency and good thermal stability.

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