What are the differences in the application of thyristors in circuits, which look like transistors?

Thyristor is a semiconductor device widely used in the field of electronics due to its unique electrical characteristics and wide range of applications. Although thyristors and transistors have some similarities in appearance, their applications in circuits have significant differences. Here are some different applications of MAX485CPA thyristors in circuits:

1. Switch application:

Thyristor is a bistable device that can withstand high reverse voltage in the off state and low voltage drop in the on state. This makes thyristors very useful in high voltage and high current switching applications. Thyristors can be used as control switches for high-voltage AC power sources, such as for motor drives, power system control, etc.

2. AC voltage control:

The conduction state of a thyristor can be achieved through a triggering pulse. Once triggered, the thyristor will remain in a conducting state until the current drops below its holding current (continuous current) level. By utilizing this characteristic, thyristors can be used as AC voltage controllers. By adjusting the time and width of the trigger pulse, the conduction angle of the thyristor can be controlled, thereby controlling the magnitude of the AC voltage.

3. AC voltage frequency conversion:

Thyristors can be used for AC voltage variable frequency control. By controlling the conduction angle and conduction time of the thyristor, the frequency and magnitude of the AC voltage can be changed. This is very useful in many applications, such as speed control of AC motors, reactive power compensation of AC power sources, etc.

4. DC power control:

Thyristors can be used as controllers for DC power supplies. By controlling the conduction angle and conduction time of the thyristor, the output voltage of the DC power supply can be adjusted. This is very useful in applications that require precise control of DC power output, such as welding machines, electroplating equipment, etc.

5. Inverter:

A thyristor inverter is a device that converts DC power into AC power. By controlling the conduction angle and conduction time of thyristors, the conversion of DC power to AC power can be achieved. Inverters are widely used in renewable energy systems such as solar panels and wind turbines.

In summary, although thyristors and transistors have similar appearances, they have significant differences in their working principles and application areas. Thyristors are mainly used in high-voltage and high current switching applications, AC voltage control, AC voltage frequency conversion, DC power control, and inverters