Current-mode High-voltage Isolation Switch Power

This paper purposes an isolated high-voltage current source power converter. It is a distributed power system, based on the AC current bus, capable of setting short-circuit current and working for high-voltage isolation purpose. The application situation of the converter, different types and their advantages of distributed power system and the relative researches on secondary side current source voltage power supply are introduced. Considering all of these, the main purpose of this research is developed, mainly focuses on the following three aspects.First, bus current generating system and secondary side current source voltage supply circuit should be well matched. Introduce the functions of each part, module the secondary side switching circuit based on small-signal, give the principle of choosing high-voltage isolation transformers and magnetic components.Second, in order to reduce the volume of the whole module, benefit the EMS protecting and the design and installing of the high-voltage parts, this application uses the secondary side self power-up method to get rid of the redundancy assistant power supply. Then combine the comparer and TL431 to generate multi-path synchronous triangular wave and PWM switching signals. Also compare the differences and application occasions of several self power-up triangular wave generators, module the whole circuit.At last, this application introduces the current source synchronous rectification technique, replacing freewheeling diode with PMOS, reducing the loss and the size of the radiator and whole module.This paper introduces and analyzes the core parts of the application in detail, gives the specific parameters and the calculating method. And basically achieve the requirement of industrial use.