Heterogeneous hybrid switch unit thermal reliability optimization method based on safe operation area

By calculating the target optimization parameters in real time, adjusting the switching frequency and SiC interrupt ratio, the problem of over-temperature efficiency of hybrid switching units under different working conditions is solved, and the reliability and efficiency of heterogeneous hybrid switching units are balanced, avoiding the risk of device over-temperature.

CN120546444APending Publication Date: 2025-08-26CHINA SOUTHERN POWER GRID COMPANY
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Patent Information

Application Number
CN202510707028.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-29
Publication Date
2025-08-26

AI Technical Summary

Technical Problem

The reliability optimization methods of existing hybrid switching units lack flexibility and cannot be flexible in accordance with working conditions, resulting in excessive adjustment when the load amplitude is small, increasing losses and reducing system efficiency. At the same time, SiC-based devices face the risk of overtemperature.

Method used

Through a method based on the safe operation area, the target optimization parameters are calculated in real time, the switching frequency and SiC interrupt ratio are adjusted, so as to ensure that the hybrid switching unit avoids overtemperature risks under different operating conditions, taking into account the reliability and efficiency of the equipment.

Benefits of technology

The reliability and efficiency of hybrid switching units under different operating conditions are achieved, the risk of device overtemperature is avoided, the junction temperature is controlled within 150℃, and the overall performance of the system is improved.

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Abstract

The invention belongs to the technical field of thermal management and reliability optimization, and particularly discloses a heterogeneous hybrid switch unit thermal reliability optimization method based on a safe operation area, and the method comprises the following steps: S1, obtaining a corresponding two-dimensional safe operation area projection under a rated parameter according to the safe operation area of a heterogeneous hybrid switch unit, extracting a current maximum value Imax20 according to the regional projection; s2, acquiring a current load current IF, comparing the size of Imax20 with the size of IF, if Imax20 is greater than or equal to IF, performing S3, and if Imax20lt, performing S3; when IF, performing S4; s3, single parameter adjustment is carried out; s4, carrying out two-parameter adjustment; and S5, inputting the target optimization parameters into a PWM signal generation module, and generating SiC-based device and Si-based device driving signals corresponding to the target switching frequency and the SiC interruption proportion through cooperative work of the DSP and the FPGA, thereby expanding the safe operation area of the hybrid switch unit. The over-temperature risk of the hybrid switch unit is avoided, and the reliability of the hybrid switch unit is improved.
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