Thyristor, also known as thyristor. When it comes to thyristor modules, people often think of them as something similar to diodes, but their detailed functions are often not well understood, especially in circuits. Below, we will explain in detail the role of thyristor modules in circuits.
There are generally two functions of thyristors in circuits, namely controllable rectification and contactless switching.
Controllable rectification:
Generally speaking, the use of ordinary thyristor modules in circuits is for controllable rectification, while diode rectification circuits, which are familiar to everyone, belong to uncontrolled rectification circuits. If diodes can be replaced with thyristor modules, they can be used in various applications such as controllable rectification circuits, inverters, motor speed regulation, motor excitation, and automatic control of contactless on-off switches. In electrical technology, the half cycle of alternating current is often referred to as 180 degrees, which is called the electrical angle. Therefore, in each positive half cycle of U2, the electrical angle experienced from zero to the moment of triggering the pulse is called the control angle α; The electrical angle at which the thyristor conducts during each positive half cycle is called the conduction angle θ. Obviously, both α and θ are used to represent the conduction or blocking range of a thyristor during half a cycle of forward voltage. By changing the control angle α or conduction angle θ, the average value UL of the pulsed DC voltage on the load is altered, achieving controllable rectification.
Contactless switch:
The function of a thyristor module is not only rectification, but it can also be used as a contactless switch to quickly connect or disconnect circuits, achieve the inversion of direct current into alternating current, and convert one frequency of alternating current into another frequency of alternating current, etc.
It can be seen that the role of thyristor modules in circuits is still significant. thyristor modules can already replace some traditional control components, laying a solid foundation for better use of electrical equipment and electricity consumption.
