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A control circuit of a five-level full-bridge inverter

A full-bridge inverter and control circuit technology, which is applied to electrical components, output power conversion devices, and conversion of AC power input to DC power output. It can solve the problems of large switching loss and low conversion efficiency of the inverter. Achieve the effects of reducing switching loss, easy DSP implementation, and simple programming

Active Publication Date: 2020-01-03
HOHAI UNIV
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  • Description
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Problems solved by technology

It can be seen that when the output voltage is ±E, the fifth switching tube (S 5 ) and the sixth switching tube (S 6 ) switching loss is large, by image 3 It can be seen that when the output power is large, the conversion efficiency of the inverter is still low.

Method used

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  • A control circuit of a five-level full-bridge inverter
  • A control circuit of a five-level full-bridge inverter
  • A control circuit of a five-level full-bridge inverter

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Embodiment Construction

[0034] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] The control circuit of the five-level full-bridge inverter designed by the present invention, such as Figure 4 shown. The five-level full-bridge inverter includes a DC power supply U dc , input voltage dividing capacitor 1, five-level inverter circuit 2, an output filter inductor L f , an output filter capacitor C f and a load resistor R. The control circuit includes a closed-loop controller 3 and a modulation circuit 4 . The modulation circuit 4 includes seventeen comparators, ten subtractors, two adders, four inverters, two AND gates, two OR gates, three gates and eight drive circuits, specifically as follows:

[0036] modulation signal u e Respectively connected with the positive input end of the first subtractor, the positive input end of the second subtractor, the positive input end of the third subtractor, the positive ...

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Abstract

The invention discloses a control circuit of a five-level full-bridge inverter. Aiming at the problem of low efficiency of the traditional five-level full-bridge inverter modulation strategy in high-power output, a new modulation strategy is designed. The working mode of the level full-bridge inverter when the output is ±E changes to a new mode with low switching loss, and the switching tube that works when switching to the new mode is turned on or off. Soft switching improves the conversion efficiency of the five-level inverter and has broad application prospects in the field of multi-level power electronic converters.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to the technical field of control of multi-level power electronic converters, and in particular relates to a control circuit of a five-level full-bridge inverter. Background technique [0002] With the increasing environmental problems, traditional power generation methods are increasingly unable to meet people's needs for environmental protection. New energy power generation occupies a certain place in the current power generation mode, and the inverter, as the connection hub between new energy power generation and the grid, plays an important role in new energy power generation. The five-level inverter has become a research hotspot because of its many output levels, small output current harmonics, and good output effects. [0003] A five-level full-bridge inverter whose topology is as follows figure 1 shown. Due to the large number of its own switching tubes, when the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
Inventor 郑仲舒张犁陈光杨行健刘淇
Owner HOHAI UNIV
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