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Current conversion circuit

A technology for commutating current and circuits, which is applied to emergency protection circuit devices, electrical components, and conversion of AC power input to DC power output. Effects of static pressure drop, volume and efficiency advantages

Pending Publication Date: 2022-01-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the current source converter is that there is always a bridge arm on one side that needs to flow DC current. When using IGBT and other devices, the proportion of on-state loss in the converter is too high, and the efficiency is low.

Method used

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Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] It should be noted that the relative arrangements, numerical expressions and numerical values ​​of components, units, circuits and steps set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0031] The following description of at least one exemplary embodi...

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PUM

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Abstract

The invention discloses a current conversion circuit, and relates to the technical field of current conversion circuits. The circuit comprises a filter capacitor, a converter reactor and a converter. The filter capacitor is connected in parallel with the alternating current port; the converter reactor is connected in series with the alternating current port; the converter comprises a bridge arm connected with a converter reactor, the bridge arm is composed of one or more unit circuits connected in series, and each unit circuit comprises a current on-off control component and an overvoltage suppression component which are connected in parallel. The converter circuit provided by the invention not only has high reliability, but also facilitates the design of circuit parameters.

Description

technical field [0001] The invention belongs to the technical field of current conversion circuits, in particular to a commutation circuit. Background technique [0002] The DC side of the current source converter has a step-down characteristic. The maximum voltage of each bridge arm is the peak value of the line voltage, which is less than twice the peak phase voltage of the voltage source device, which can reduce the number of series devices. During each commutation process, the voltage change of the bridge arm is low, so that the RC loss of voltage equalization is reduced. Current source converters can be used in high-voltage DC transmission to solve the problem of commutation failure, and can also be used in medium and low voltage applications, such as AC grid closure, DC power distribution, and grid melting. However, the disadvantage of the current source converter is that there is always a bridge arm on one side that needs to flow DC current. When devices such as IGBT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/088H02M1/32H02H7/122
CPCH02M7/219H02M1/088H02M1/32H02H7/122
Inventor 赵彪白睿航周天吉屈鲁余占清曾嵘
Owner TSINGHUA UNIV