Single-phase two-tube five-level rectifier based on hybrid H bridge

Abstract

The invention provides a single-phase two-tube five-level rectifier based on a hybrid H bridge. The rectifier comprises a switching tube Q1 and a switching tube Q2, one side of an alternating currentpower supply Vs is connected with the anode of a diode D1 and the cathode of a diode D2, and the connection node forms an end point b; the connection nodes of the other end of an inductor L and diodesD3, D4, D5 and D6 form end points a; the connection nodes of the drain electrode of the switching tube Q1 and the diodes D1, D3 and D7 form end points c; the connection nodes of the source electrodeof the switching tube Q1 and the diodes D2, D4 and D8 form end points d; the anode of the diode D8 is connected with the negative electrode of a capacitor C2 to form an end point m; the anode of the diode D11, the cathode of the diode D12 and the positive electrode of the capacitor C2 are connected with the negative electrode of a capacitor C1 to form an end point n; the cathode of the diode D7 isconnected with the positive electrode of the capacitor C1 to form an end point p. The end point a, the end point c, the end point d and the end point n form four ports of the hybrid H bridge. The rectifier has the advantages of being high in output direct-current voltage, small in harmonic content, low in switching tube stress, easy to 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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