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Three-phase improved double Buck/Boost converter based on SiC diode

A converter, an improved technology, applied in the direction of converting AC power input to DC power output, output power conversion device, high-efficiency power electronic conversion, etc., can solve the problem of affecting work reliability, increasing loss, current zero-crossing distortion, etc. problem, achieve the effect of improving work efficiency and performance, reducing power loss, and reducing distortion rate

Pending Publication Date: 2018-10-19
南京德汇电气有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the power tubes of the upper and lower bridge arms of each phase are directly connected, and there is a switch through problem, which affects the reliability of the work.
In order to avoid shoot-through, a dead zone must be added to the complementary bridge arm drive signal, which introduces additional low-frequency harmonics, which increases the size and cost of the filter; in addition, the silicon-based IGBT has more reverse recovery current flowing at the switching moment Complementary power tubes not only increase their loss, but also easily lead to abnormal IGBT lock-up, causing faults and easily generating current zero-crossing distortion

Method used

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  • Three-phase improved double Buck/Boost converter based on SiC diode
  • Three-phase improved double Buck/Boost converter based on SiC diode
  • Three-phase improved double Buck/Boost converter based on SiC diode

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0021] figure 1 The structure diagram of the three-phase dual Buck / Boost converter is shown;figure 1 The symbols in have the following descriptions:

[0022] C in1 ~C in2 : DC side electrolytic capacitor,

[0023] S x1 ~S x2 : three-phase upper and lower bridge arm power IGBT tubes (x = a, b, c),

[0024] S x3 ~S x4 : Three-phase bridge arm reverse IGBT switch (x=a,b,c),

[0025] D x1 ~D x2 : External freewheeling SiC diode (x=a,b,c),

[0026] La 1 , La 2 ~Lc 1 , Lc 2 : Three-phase filter independent inductor,

[0027] Ca~Cc: AC filter capacitor,

[0028] Lag~Lcg: grid-side inductance,

[0029] ia 1 , ia 2 : Flow through the inductance La 1 , La 2 the current, ...

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PUM

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Abstract

The invention discloses a three-phase improved double Buck / Boost converter based on a SiC diode. The converter comprises three-phase upper and lower bridge IGBT tubes, corresponding external freewheeling diodes and reverse-connected AC IGBT switches, wherein an AC side is provided with an LCL filter circuit, and an inductor on the converter side of the LCL filter circuit consists of two independent inductors The converter is advantaged in that no dead zone between the upper and lower IGBT tubes exists, not only can the two-way flow of the energy be achieved, current harmonic waves on the AC side and power loss of the circuit are effectively reduced, but also the current zero-crossing distortion rate can be reduced through setting the reverse-connected AC IGBT switches, and work efficiencyand work performance are improved.

Description

technical field [0001] The invention relates to research on a three-phase improved dual Buck / Boost converter based on SiC diodes, and belongs to the technical field of power electronic converters. Background technique [0002] With the development of new energy technology, three-phase AC / DC converters have been widely used in medium and high power applications such as photovoltaic power generation, wind power, and electric vehicle charging piles, and have become important equipment for new energy power generation and power quality management. , the market demand is more and more urgent, and it is a hot spot in the field of power electronics technology today. Therefore, it is of great significance to optimize the waveform quality of the three-phase AC / DC converter, improve the working reliability, and improve the converter topology. [0003] The traditional silicon-based IGBT three-phase bridge converter has been widely used for its advantages of stable performance and easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/12
CPCH02M1/12H02M7/219H02M1/0051Y02B70/10
Inventor 张敏马自应
Owner 南京德汇电气有限责任公司
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