A rectifier bridge typically carries a sufficiently large inductive load, thus preventing current discontinuity. In general applications, a smoothing reactor is connected to the load terminal of a rectifier bridge, allowing the load to be considered a constant current source. Multiple three-phase rectifier bridges are interconnected, causing harmonics generated by the rectifier bridge circuit to cancel each other out. Based on the type of rectifier transformer, rectifiers can be divided into traditional multi-pulse transformer rectifiers and autotransformer multi-pulse transformer rectifiers. Traditional multi-pulse transformer rectifiers use isolation transformers to isolate the input and output voltages, but these transformers have large equivalent capacity and are bulky.
The rectifier bridge is controlled by the controller's control angle. When the control angle is 0° to 90°, the rectifier bridge is in rectification mode, and the average output voltage is positive. When the control angle is 90° to 180°-γ (γ is the switching angle), the rectifier bridge is in inversion mode, and the average output voltage is negative.
