Abstract
As a key component of a large-capacity converter, the laminated busbar can improve the reliability, integration and power density of the converter and has great advantages in reducing the parasitic inductance of the switching loop. The laminated busbar suitable for a high-capacity back-to-back converter has a complex structure, and couple with each side converter. It has been challenging to optimize the equivalent inductance by using the traditional single-converter busbar design method. In this paper, the coupling inductance model of the back-to-back converter is established, and the relationship between the voltage stress of the switch tube and the stray inductance is analyzed in detail. Based on this, the design principle of the laminated busbar is proposed, and an optimized design structure of the laminated busbar suitable for the large-capacity back-to-back converter is given. Finally, the results were effectively verified by simulation analysis and a 180 kW integrated intermediate frequency auxiliary power converter.
Highlights
With the development of power electronic technology and semiconductor devices, large capacity, integration, high frequency and high power density have gradually become the development trends of power electronic converters [1,2,3]
The laminated busbar structures applied to various converter topologies are quite different in terms of stray inductance, so the transient analysis of the laminated busbar stray parameters and the structural optimization design of the laminated busbar are important topics for high-capacity power electronic converters
This section first analyzes the stray inductance of the laminated busbar and This section first analyzes the inductance of theand laminated and of studies the relationship between thestray switch voltage stress the straybusbar inductance the studies the relationship between the switch voltage stress and the stray inductance of back-to-back converter
Summary
With the development of power electronic technology and semiconductor devices, large capacity, integration, high frequency and high power density have gradually become the development trends of power electronic converters [1,2,3]. Compared with traditional connecting devices, laminated busbars with high reliability and low stray inductance have greater advantages in large-capacity and high-integration applications [10,11,12,13,14,15,16,17] They can reduce the enclosed area of the commutation loop, effectively reduce the equivalent stray inductance and are easy to assemble, which is conducive to improving the power density of the converter. The instantaneous current distribution of a multi-capacitor parallel bus is compared through theoretical analysis, and an optimized design structure of a laminated busbar suitable for large-capacity, back-to-back converters is given. A 180 kW integrated high frequency auxiliary power converter is designed, and the correctness of the theoretical analysis is verified by simulation analysis and double-pulse experiment
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