Single-phase five-level power factor correction circuit based on hybrid H bridge

Abstract

A single-phase five-level power factor correction circuit based on a hybrid H bridge comprises switching tubes Q1, Q2 and Q3. One side of an alternating-current power supply Vs is connected with an anode of a diode D1 and a cathode of a diode D2, and a connection node forms an end point b. The other side of the alternating-current power supply Vs is connected with one end of an inductor L, the other end of the inductor L is connected with the anode of a diode D3 and the cathode of a diode D4, and connection nodes form an end point a. The drain electrode of the switching tube Q3 is connected with the cathode of the diode D1, the cathode of the diode D3, the anode of the diode D7, the drain electrode of the switching tube Q1 and a connection node to form an end point c. The source electrodeof the switching tube Q3 is connected with the anode of a diode D2, the anode of a diode D4, the cathode of a diode D8 and the source electrode of a switching tube Q2, and the connection node forms anend point d. The source of the switching tube Q2 is connected with the drain of the switching tube Q1, and the connection node forms an end point n. The cathode of the diode D7 is connected with oneend of the capacitor C1, and a connection node forms an end point p. The negative electrode of the capacitor C2 is connected with the anode of the diode D8 and the connection node forms an end point m. And the endpoint a, the endpoint c, the endpoint d and the endpoint n form four ports of the hybrid H-bridge network structure. The circuit structure has the advantages of low cost, high reliability, simple control system design and the like.

Description

technical field [0001] The invention relates to a power factor correction circuit, in particular to a single-phase five-level power factor correction circuit 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. The five-level high power factor correction circuit needs to meet the requirements of unit power factor, low harmonic content and stable DC side voltage; the traditional five-level power factor correction circuit mostly uses diode clamping circuit and flying capacitor clamping circuit to realize five-power Flat output, its structure is complex, and the design of the control system is difficult; at the same time, the reliability of the five-level power factor circuit based on the diode clamp type and th...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is mainly aimed at the existing five-level topological structure, which is mostly a symmetrical H-bridge structure. This type of structure has the disadvantages of many controllable devices, difficult control system design, and insufficient reliability.

Images