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

Abstract

Single-phase five-level power factor correction circuit based on hybrid H-bridge, including switching tube Q 1 , Q 2 , Q 3 , 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 terminal b; the other side of the AC power supply Vs is connected to one end of the inductor L, and the other end of the inductor L is connected to the diode D 3 anode, diode D 4 Cathode, connecting nodes to form terminal a; switching tube Q 3 The drains are connected to the diode D 1 cathode, diode D 3 cathode, diode D 7 Anode, switching tube Q 1 Drain, the connection node constitutes the terminal c; the switch tube Q 3 The source is connected to the diode D respectively 2 anode, diode D 4 anode, diode D 8 Cathode, switching tube Q 2 The source, the connection node constitutes the terminal d; the switch tube Q 2 The drain is connected to the switch Q 1 source, whose connection node constitutes terminal n; diode D 7 Cathode connection capacitance C 1 One end, the connecting node constitutes the terminal p; the capacitance C 2 The cathode is connected to the diode D 8 Anodes, the nodes of which are connected constitute terminal m. The invention 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.

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