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Control circuit for five-level full-bridge inverter

A full-bridge inverter and control circuit technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc., can solve the problems of large switching loss and low conversion efficiency of the inverter, etc. Achieve the effect of reducing switching loss, easy DSP implementation, and improving conversion efficiency

Active Publication Date: 2019-05-14
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Control circuit for five-level full-bridge inverter
  • Control circuit for five-level full-bridge inverter
  • Control circuit for 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 for a five-level full-bridge inverter and designs a new modulation strategy specific to the problem that the traditional five-level full-bridge inverter modulation strategy is relatively low in efficiency when high power output is achieved. An operation mode when output of the five-level full-bridge inverter is minus or plus E is changed into a new mode with low switching loss, and a switching tube operating in a process of switching to the new mode belongs to soft switching when being turned on or off, so that conversion efficiency of a five-level inverter is improved, and the five-level inverter has a broad application prospect 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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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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