Multi-level inverter and power supply system

Abstract

The invention provides a multi-level inverter and a power supply system, and relates to the electronic field. The multi-level inverter and the power supply system can simplify circuit structures. The multi-level inverter comprises two N-level inversion units, a direct-current power source module, a transformer and a filter. Pulse width modulation waves of the two N-level inversion units are staggered by 180-degree phase positions, and the N is an integer larger than or equal to three. The output end of the direct-current power source module is respectively connected with the input ends of the two N-level inversion units, the transformer comprises an original edge and an auxiliary edge, an inductor of the original edge and an inductor of the auxiliary edge are mutually coupled, one end of the inductor of the original edge and one end of the inductor of the auxiliary edge are connected with the output ends of the two N-level inversion units respectively, and therefore the two N-level inversion units are coupled in a phase reversal mode. The other end of the inductor of the original edge and the other end of the inductor of the auxiliary edge are mutually connected, W levels are output at the connecting positions of the inductors, and the W is equal to 2N-1. One end of the filter is connected with the connecting positions of the two coupled inductors, and the other end of the filter is connected with the ground. The multi-level inverter and the power supply system are used for converting the direct current into the alternating current.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a multilevel inverter and a power supply system. Background technique [0002] Inverter (inverter) is a device that converts direct current (DC) into alternating current (AC), that is, it can convert direct current energy, such as batteries and storage batteries, into alternating current. The alternating current is generally 220v, 50HZ sine wave or square wave. The multi-level inverter can convert the direct current into a stepped square wave with multiple levels first, and then form a sine wave through a filter. The closer the waveform is to a standard sine wave. In the prior art, a multilevel inverter may include two inverter units, multiple independent inductors or coupled inductors, output filter capacitors, and multiple power switching devices. The two inverter units are interleaved and connected in parallel for performing The conversion of current is to convert direct current ...

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Problems solved by technology

[0003] However, in the above-mentioned multi-level inverter, in order to realize the interleaving and parallel connection of two inverter units, it is necessary to connect power switching devices outside the two inverter units, so the number of power switching devices is large. The flat inverter needs to set 2 or 4 power switching devices outside the two-phase interleaved parallel inverter unit, so the circuit structure is more complicated

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