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Power module current sharing method, device and system

A power module and target power technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of increasing additional costs, affecting the effect of current sharing, and deviations in the manufacturing process of reactors, so as to reduce costs and improve the effect of current sharing Effect

Active Publication Date: 2020-07-28
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of current sharing reactors or circulating current suppression reactors will increase additional costs. In addition, due to the deviation of the manufacturing process of the reactors, the impedance of the parallel connected power modules will be different, which will affect the current sharing effect.

Method used

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  • Power module current sharing method, device and system
  • Power module current sharing method, device and system
  • Power module current sharing method, device and system

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Embodiment Construction

[0049] The characteristics and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention more clear, 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 configured to explain the present invention, not to limit the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and ...

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Abstract

The embodiment of the invention discloses a current-sharing method, device and system of a power module. The method comprises the following steps: acquiring a voltage between an emitter of an IGBT module of each power module in parallel connection and an AC output terminal of the IGBT module in the current pulse duration of the PWM pulse; adjusting the pulse duration of the next PWM pulse of eachpower module according to the acquired voltage, and performing current sharing on the power module in parallel connection. Through the current-sharing method, device and system disclosed by the embodiment of the invention, the pulse duration of the next PWM pulse of each power module is automatically adjusted according to the voltage between the emitter of the IGBT module of each power module in parallel connection and the AC output terminal of the IGBT module in the current pulse duration of the PWM pulse, an operation of using a current-sharing electric reactor or a circulation suppression electric reactor is avoided, and then the cost can be reduced and the current-sharing effect is improved.

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular to a current sharing method, device and system for a power module. Background technique [0002] Limited by the withstand voltage, switching frequency and power level of power electronic devices, high-power converters mainly use the parallel connection of power modules to realize the expansion of power capacity. [0003] In order to improve the stability and reliability of the converter, it is necessary to perform current sharing on the power modules connected in parallel in the converter. [0004] At present, current sharing reactors or circulating current suppression reactors are usually used to share currents among power modules connected in parallel in the converter. However, the use of a current sharing reactor or a circulating current suppression reactor will increase additional costs. In addition, due to the deviation of the manufacturing process of the rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
Inventor 符松格
Owner BEIJING ETECHWIN ELECTRIC
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