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Domestic Express Position Hold

Domestic Express Position Hold

Domestic express Position Hold There are many classification methods for thyristors. (1) Classification according to shutdown, conduction and control methods: thyristors can be divided into common thyristors, triacs, reverse-conducting thyristors, and gate-offs according to their turn-off,...

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Domestic express Position Hold



There are many classification methods for thyristors.
(1) Classification according to shutdown, conduction and control methods: thyristors can be divided into common thyristors, triacs, reverse-conducting thyristors, and gate-offs according to their turn-off, conduction, and control modes. SCR (GTO), BTG thyristor, temperature-controlled thyristor and light-controlled thyristor.
(2) Classification by pin and polarity: The thyristor can be divided into two-pole thyristor, three-pole thyristor and four-pole thyristor according to its pin and polarity.
(3) Classification according to package form: The thyristor can be divided into three types: metal packaged thyristor, plastic sealed thyristor and ceramic packaged thyristor according to its package form. Among them, the metal packaged thyristor is further divided into a bolt shape, a flat plate shape, a round shell shape and the like; the plastic sealed thyristor is further divided into a heat sink type and a heat sink type.

(IV) Classification according to current capacity: SCR can be divided into high-power thyristor, medium-power thyristor and low-power thyristor according to current capacity. Generally, high-power thyristors are mostly packaged in metal shells, while medium- and small-power thyristors are mostly packaged in plastic or ceramic packages.
(5) Classification according to the shutdown speed: The thyristor can be divided into ordinary thyristor and high frequency (fast) thyristor according to its shutdown speed.
(6) Zero-crossing triggering - generally is the power adjustment, that is, when the sinusoidal alternating current AC voltage phase is triggered by the zero-crossing point, it must be triggered by the zero-crossing point to turn on the thyristor.
(7) Non-zero-crossing triggering - the thyristor can be triggered regardless of the phase of the AC voltage. The common phase shift trigger is to change the output percentage by changing the conduction angle (angular phase) of the sinusoidal alternating current. 

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