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Four-level topology unit

A four-level, topological technology, applied to electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve problems such as poor reliability and cost increase

Pending Publication Date: 2018-10-16
EAST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to use voltage equalization measures and larger absorbing circuits in traditional four-level AC-DC converters to prevent overvoltage across flying capacitors and some switch tubes and diodes, which will increase cost and reliability. To solve the problem of poor performance, a four-level topology unit is provided

Method used

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] See figure 1 , figure 1 It is a schematic diagram of a four-level topology unit according to an embodiment of the present invention.

[0036] In this embodiment, the four-level topology unit is connected between the positive pole and the negative pole of the DC power supply, and the four-level topology unit includes: a first switch unit Q1, a second switch unit Q2, and a third switch unit Q3 , the fourth switch unit Q4, the fifth switch unit Q5, the sixth switch unit Q6, the seventh switch unit Q7, the eighth switch unit Q8, the ninth switch unit Q9, and the tenth switch unit Q10 are conne...

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Abstract

The invention relates to a four-level topology unit, which is connected between a positive pole and a negative pole of a DC power supply and comprises a first switching unit, a second switching unit,a third switching unit, a fourth switching unit, a fifth switching unit, a sixth switching unit, a seventh switching unit, an eighth switching unit, a ninth switching unit, a tenth switching unit, a diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a current-limiting inductor, wherein the diode is reversely connected to two ends of the switching units in parallel. The four-level topology unit is capable of providing higher AC voltage under the condition of keeping low loss, and simultaneously preventing overvoltage of a flying capacitor and one parts of switching tubes or two ends of the diode; the cost and the loss of an AC side of an AC / DC converter can be effectively reduced; and the reliability is higher.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a four-level topology unit. Background technique [0002] A bidirectional AC-DC converter is a converter that converts DC power into AC power or converts AC power into DC power. With the continuous development and progress of society, human beings' demand for energy is increasing day by day, and new energy sources such as photovoltaics and energy storage account for an increasing proportion of energy. As its core, photovoltaic inverters and energy storage converters have become more and more fierce in the market competition in recent years. In order to meet the market demand, more and more multi-level AC-DC converters are introduced into the market, such as four-level AC-DC converters. [0003] Traditional four-level AC-DC converters need to adopt voltage equalization measures and larger snubber circuits to prevent overvoltage across flying capacitors, some switches a...

Claims

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Application Information

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IPC IPC(8): H02M7/797
CPCH02M7/797
Inventor 余仕君高钢
Owner EAST GRP CO LTD
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