Single-phase three-level power factor correction rectifier based on symmetrical four ports

Abstract

Single-phase three-level power factor correction rectifier based on asymmetric four-port, including AC power supply, inductor L, switch tube Q 1 , Q 2 , Q 3 , Q 4 , Diode D 1 、D 2 、D 7 、D 8 、D 9 、D 10 , capacitance C dc1 、C dc2 ; Diode D is connected to the AC side of the AC power supply 1 anode, diode D 2 The cathode, whose connection node constitutes terminal b; the other side of the AC power supply AC is connected to one end of the inductor L, and the other end of the inductor L is respectively connected to the switch tube Q 3 Source, switch tube Q 4 The drain, its connection node constitutes the terminal a; the switch tube Q 3 The drains are connected to the diode D 1 cathode, diode D 8 Anode, its connection node constitutes terminal c; switching tube Q 4 The source is connected to the diode D respectively 2 anode, diode D 7 the cathode, whose connection node constitutes the terminal d; the diode D 8 Cathode connection capacitance C dc1 One end, the connecting node constitutes the terminal p; the capacitance C dc1 The other end is connected to the capacitor C dc2 One end, the connecting node constitutes the terminal n; the capacitor C dc2 The other end is connected to the diode D 7 Anodes, the nodes of which are connected constitute terminal m. The rectifier topology can adopt multi-carrier modulation to control different circuit modes.

Description

technical field [0001] The invention relates to the technical field of single-phase electric energy conversion, in particular to a single-phase three-level power factor correction rectifier based on symmetrical four ports. Background technique [0002] In today's industrial applications, there is a large demand for DC power. In the conversion of electric energy, the AC voltage is usually converted into DC for DC-DC conversion. In the process of rectification, usually because the current waveform cannot The completely more voltage-dependent waveform leads to a lower power factor in the rectification process. The power factor rectifier has been proposed for many years to overcome the problem of voltage and current power factor on the AC side. [0003] Rectification is ubiquitous in industrial applications, and it will be applied to the rectification process under different voltage levels. In the current high-voltage direct current transmission process, it is necessary to recti...

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Problems solved by technology

[0002] In today's industrial applications, there is a large demand for DC power. In the conversion of electric energy, the conversion of AC voltage into DC is usually used for DC-DC conversion. In the process of rectification, usually because the waveform of the current cannot The completely more voltage-dependent waveform leads to a lower power factor in the rectification process. The power factor rectifier has been proposed for many years to overcome the problem of voltage and current power factor on the AC side.

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