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Three-phase cascaded converter

A converter and cascading technology, which is applied in the field of three-phase cascaded converters, can solve the problems of low reliability and achieve the effects of improving reliability, high switching frequency, and avoiding bridge arm straight-through

Active Publication Date: 2015-04-29
BEIJING HYPERSTRONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a three-phase cascaded converter to overcome the problem of low reliability caused by bridge wall direct connection in the prior art

Method used

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Embodiment Construction

[0039] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0040] figure 1 This is a schematic structural diagram of a three-phase cascade converter provided in the first embodiment of the present invention. The device of this embodiment may include: three groups of single-phase cascade converters 101,

[0041] Each group of single-phase cascaded converters 101 includes at least two cascaded do...

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Abstract

The invention provides a three-phase cascaded converter which comprises three sets of single-phase cascaded converters, wherein each set of single-phase cascaded converter comprises at least two dual buck inverters; each dual buck inverter comprises a first AC end and a second AC end; the second AC end of each previous stage of dual buck inverter of each set of single-phase cascaded converter is connected with the first AC end of the next stage of adjacent dual buck inverter; the first AC end of the first stage of dual buck inverter of each of the three sets of single-phase cascaded converters is connected with an AC power supply and the second AC ends of the last stages of dual buck inverters of the three sets of single-phase cascaded converters are mutually connected; the dual buck inverters have the bridge arm shoot-through phenomenon, so that the bridge arm shoot-through danger is effectively avoided; moreover, switching frequency can be designed to be very high, so that reliability of the three-phase cascaded converter is effectively improved; furthermore, a body diode of each dual buck inverter has no reverse recovery problem, so that the service life of the three-phase cascaded converter is effectively prolonged.

Description

Technical field [0001] The invention relates to electric energy conversion technology, in particular to a three-phase cascade converter. Background technique [0002] In recent years, the application of new energy has presented new challenges to the development of power electronics technology, especially in the fields of electric vehicles, wind power generation, etc., for three-phase AC / DC (Alternating Current / Direct Current, referred to as: AC / DC) conversion The performance of the device puts forward higher requirements. Therefore, it is very important to improve the reliability of the three-phase AC / DC converter, optimize the quality of the output waveform, and improve the topology of the converter. [0003] Among a variety of three-phase AC / DC converters, three-phase multilevel converters have been widely used in high-power applications due to their superior performance. The multilevel converter synthesizes multiple levels into a step wave, which is close to the sinusoidal out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/53875H02M7/5388H02M7/5395
Inventor 钱昊张剑辉舒鹏
Owner BEIJING HYPERSTRONG TECH