The three-phase bridge rectifier circuit widely used in generator excitation system can be divided into three-phase half control bridge and three-phase full control bridge. Therefore, in order to ensure the safe and reliable commutation of rectifier components, the half control bridge must be connected with the current diode on both sides of the inductive load, while the full control bridge does not need to do so. When the conduction angle changes, the average operating voltage and line current of the half controlled bridge change more slowly than that of the full controlled bridge.
At present, there are rectifier and inverter converter circuits in the widely used machinery and equipment such as frequency converter. The freewheeling diode is usually added to the DC bus in the frequency converter. That is because once the load is an inductive element, when the inverter with large capacity on the bus has a problem, the DC bus will form a huge surge energy in the opposite direction. At this time, when the load is an inductive element, the DC bus will generate a large amount of surge energy, We must give a discharge channel for this energy, otherwise the great energy will break down or burn down the small inverter
And this channel must be composed of diodes, so it should be freewheeling diode.
The above is the explanation of three-phase semi controlled rectifier bridge with freewheeling diode by the rectifier module manufacturer semipower. Semipower is a power semiconductor power module manufacturer specialized in power electronics technology. It provides the formulation, production, processing and production of semiconductor power modules for enterprises and companies. In addition, it also provides enterprises with processing projects with supplied materials or OEM. The main products are: IGBT module, thyristor (thyristor) module, ultra fast recovery epitaxial diode module, single-phase rectifier bridge module, three-phase rectifier bridge module, rectifier diode module, Schottky diode power module and other power semiconductor electronic components.
