Research on single-phase bridge rectifier circuit based on MATLAB

1 Introduction
Rectifier circuits, especially single-phase bridge controlled Rectifier circuits, are important in power electronics technology, and are also widely used circuits. They are not only used in general industry, but also widely used in transportation, power system, communication system, energy system and other fields. Therefore, the comparative analysis and research on the relevant parameters of single-phase bridge controlled rectifier circuit and the working conditions of different loads has strong practical significance. It is not only an important part of power electronic circuit theory learning, but also has a predictive and guiding role in the practical application of engineering practice.
2 Single phase bridge semi controlled rectifier circuit
In Figure 1, VT1 and VT2 are 180 ° of trigger pulse phase difference? Thyristors, VD1 and VD2 are rectifier diodes, and these four devices form a single-phase bridge semi controlled rectifier circuit. The resistance R and inductance L are loads. If the inductance L is assumed to be large enough, that is ω L ≥ R, because the current in the inductor cannot change suddenly, it can be considered that the load current remains constant during the whole steady state operation process. Because of the characteristics of the bridge structure, as long as the thyristor is turned on, the load always adds a forward voltage, and the load current always flows in one direction, so the bridge semi controlled rectifier circuit can only work in the front quadrant, because ω L ≥ R, so no matter the control angle α Why? The load current ID changes little.