Overview:
Thyristor, also known as thyristor, is a common semiconductor component. It is characterized by simple composition, high power, small space occupation, etc. Nowadays, more and more related industries are paying attention to it, and there are many application fields. For example, thyristors are used in household appliances such as TVs and fans. At present, ordinary unidirectional thyristors are more commonly used, which have more practical controllability.

Explanation of silicon controlled component symbols:
1. Off-state voltage critical rise rate dv/dt: The lower voltage rise rate that causes the component to transition from the off-state to the on-state when the rated junction temperature and gate are open.
2. Gate trigger current IGT: At room temperature, when the main voltage is 6 volts DC, the smaller gate DC current necessary to fully turn on the component.
3. Off-state repetitive peak voltage VDRM: 90% of the non-repetitive off-state peak voltage.
4. Gate trigger voltage VGT: corresponds to the gate DC voltage when the gate trigger current occurs.
5. Off-state repeated average current IDR: corresponds to the average leakage current under the off-state repeated peak voltage.
6. Off-state non-repetitive peak voltage VDSM: The off-state peak voltage at the sharp bend of the forward volt-ampere characteristic curve when the gate is open.
7. Off-state non-repetitive average current IDS: When the gate is open, the average leakage current corresponds to the off-state non-repetitive peak voltage at the rated junction temperature.
8. On-state average current IT: When the ambient temperature is +40°C and specified cooling conditions, the component is in a circuit with a single-phase power frequency sine half wave with a resistive load and a conduction angle of not less than 170 degrees, when the junction temperature is stable The maximum allowable on-state average current does not exceed the rated junction temperature.

Classification of thyristors:
1. Turn-off speed: There are two main types, namely ordinary and fast thyristors.
2. Current capacity: There are three main types, namely high power, medium power and low power thyristors.
3. Packaging form: There are three main types, namely metal sealing (bolt shape, flat plate shape, round shell shape), plastic sealing (with heat sink type and without heat sink type), and ceramic package thyristor.
4. Pins and polarity: This method is mainly divided into three types: four-pole, three-pole and two-pole thyristors.
5. Turn-off, conduction and control methods: This method can be divided into many types, such as bidirectional thyristor, reverse conduction thyristor, temperature control, light-controlled thyristor, etc.

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