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IGBT power module service life evaluation method based on real-time online algorithm

A power module and life evaluation technology, which is applied in calculation, computer-aided design, special data processing applications, etc., can solve problems such as duty cycle and environmental differences, and achieve reliable results, low cost, and high efficiency

Active Publication Date: 2021-04-16
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

This technology helps predict when an electric car battery needs maintenance or replacement based on its lifespan. It doesn't involve any extra devices that may affect their performance.

Problems solved by technology

Technological Problem: Current Power Electronic Module (PEM) based probes only measure their lifetimes at specific points during operation, which cannot provide an accurate prediction over how long it will last if they fail within certain times after being installed onto different types of cars with varying levels of fuel efficiency.

Method used

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  • IGBT power module service life evaluation method based on real-time online algorithm
  • IGBT power module service life evaluation method based on real-time online algorithm
  • IGBT power module service life evaluation method based on real-time online algorithm

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Embodiment Construction

[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, a real-time online algorithm-based life evaluation method for IGBT power modules includes the following steps:

[0024] Step 1: Establish a cycle model for IGBT power module failures.

[0025] It is known that the common failure mode classification of IGBT power modules involves two categories, one is the bond wire detachment, and the other is the stress crack in the solder connecting the various parts of the IGBT module.

[0026] When a device experiences temperature changes, parts expand or contract, and because of the different rates at which this change occurs, stresses develop in the solder that joins the parts together. These stresses can cause cracks early in the module's operation. Crack ...

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Abstract

The invention discloses an IGBT power module service life evaluation method based on a real-time online algorithm. The method comprises the following steps: 1, establishing a period model of IGBT power module fault occurrence; 2, estimating junction temperature data of the IGBT power module in each working period; 3, processing the junction temperature data by adopting a peak-valley detection algorithm to obtain a junction temperature difference value and corresponding time; 4, establishing a life cycle array about the junction temperature difference value and the corresponding time, wherein the value of each cell in the array is the occurrence frequency of the specific junction temperature difference value and the corresponding time; and 5, calculating the service life of the IGBT power module based on the period model and the life cycle array. The service life of the module can be calculated in real time in the using process of the IGBT module, no extra sensor is needed, the cost is low, the efficiency is high, and the result is reliable.

Description

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Claims

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Application Information

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Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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