Single-phase two-transistor five-level rectifier based on hybrid h-bridge

Abstract

A single-phase two-tube five-level rectifier based on a hybrid H-bridge, including a switching tube Q 1 , switch tube Q 2 , one side of the AC power supply Vs is respectively connected to the diode D 1 anode, diode D 2 Cathode, the connection node constitutes the terminal b; the other end of the inductor L and the diode D 3 、D 4 、D 5 、D 6 The connection node of constitutes the terminal a; the switching tube Q 1 Drain and Diode D 1 、D 3 、D 7 The connecting node constitutes the terminal c; the switching tube Q 1 source and diode D 2 、D 4 、D 8 The connection node of constitutes the terminal d; the diode D 8 Anode connection capacitor C 2 The negative electrode constitutes the terminal m; the diode D 11 anode, diode D 12 Cathode, capacitor C 2 The positive electrode is connected to the capacitor C 1 The negative electrode constitutes the terminal n; the diode D 7 Cathode connection capacitance C 1 The positive pole constitutes the terminal p. Endpoint a, endpoint c, endpoint d, and endpoint n constitute four ports of the hybrid H-bridge. The rectifier of the present invention has the advantages of high output direct current voltage, low harmonic content, low switch tube stress, relatively simple control and the like.

Description

technical field [0001] The invention relates to a five-level rectifier, in particular to a single-phase two-tube five-level rectifier based on a hybrid H bridge. Background technique [0002] With the development of power electronics technology, the research and application of multi-level power factor correction circuit has been widely concerned, and the five-level high power factor boost converter is one of the most popular research aspects at present. Using a multi-level converter can reduce the voltage stress of the switching tube on the one hand, thereby reducing the harmonic content, and on the other hand, can increase the operating voltage of the system. For high-power power electronic converters, diode-clamped multilevel converters are widely used, mainly because diode-clamped multi-level converters retain the advantages of two-level converters while reducing switching tube The voltage at both ends further reduces the harmonic content and increases the rectified volt...

AI Technical Summary

Problems solved by technology

[0003] At present, in the existing circuit structure, the output voltage level of the three-level topology is low and the harmonic content is high; while the number of switching tubes in the five-level topology is large, the control is more complicated and the loss is higher.

In the traditional topology, uncontrolled rectification is often used to boost the voltage to achieve power factor correction. This method has a large loss problem and requires a large number of switching tubes. In order to reduce the rectification loss, the length of the current flow path should be reduced as much as possible. The most effective way to increase power density is to change the topology to reduce the number of components. At the same time, the improved topology has higher voltage levels, smaller harmonic content, and simpler control methods.

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