A non-contact converter igbt module state monitoring method

A non-contact, converter technology, applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve problems such as difficult to accurately predict the life of converter IGBT modules, affect junction temperature estimation, etc., to achieve good applicability, engineering Ease of implementation and high safety

Active Publication Date: 2018-10-26
阆芯上海电子科技有限公司
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Problems solved by technology

Considering the dispersion of device parameters in the actual system, the complexity and variety of failure modes, and the influence of device states on junction temperature estimation, it is difficult for this technology to achieve accurate prediction of the life of the converter IGBT module

Method used

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  • A non-contact converter igbt module state monitoring method
  • A non-contact converter igbt module state monitoring method
  • A non-contact converter igbt module state monitoring method

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example

[0036] Example: the IGBT turn-off characteristic t of the IGBT module (FF50R12RT4) in the 380V / 10kW three-phase two-level converter before and after the fault is adopted by the inventive method sw.off =f(I off )taking the test. As the result of the experiment Figure 4 As shown, by comparing the IGBT turn-off characteristics f(I off ) can be found to change the health status of the IGBT module. The implementation process is as follows:

[0037] 1. Install a current probe at the A-phase output of the converter system. The current probe model is CP8030A with a bandwidth of 50MHz, which is used to measure the high-frequency oscillation signal in the output phase current of phase A of the converter and record the cut-off current I off . Use a thermocouple to measure the case temperature T of the IGBT module c . This patented method can monitor the state of all IGBT tubes in a certain phase bridge arm. If you need to monitor the IGBTs of other phase bridge arms, you only ne...

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Abstract

The invention relates to a non-contact converter IGBT module state monitoring method. The non-contact converter IGBT module state monitoring method comprises steps that S1, output phase current of a converter is measured, and a meter housing temperature of a converter IGBT module is measured; S2, IGBT equivalent turn-off time and IGBT turn-off current are extracted from the output phase current, and the IGBT equivalent turn-off time is the high frequency oscillation signal of the output phase current corresponding to first wave front or wave trough time caused by the turn-off of the IGBT module, and the IGBT turn-off current is the current corresponding to the time of the occurrence of the high frequency oscillation signal of the output phase current;S3, the turn-off characteristic curve used for reflecting the operation state of the converter IGBT module is acquired. Compared with the prior art, the turn-off characteristics of the IGBT device under different current conditions are measured conveniently, and the non-contact converter IGBT module state monitoring method is suitable for converter systems having various structures, and the improving of the operation stability of the converter system is facilitated, and therefore the non-contact converter IGBT module state monitoring method has advantages of simplicity, safety, and good applicability.

Description

technical field [0001] The invention relates to a method for monitoring the status of a converter, in particular to a method for monitoring the status of a non-contact converter IGBT module. Background technique [0002] A converter is a power conversion device that is widely used in new energy power generation, electric vehicles, rail transit, aerospace, and metallurgy. As the core component of the converter, the failure of the IGBT module can lead to the interruption of the operation of the entire converter system, and even cause safety accidents and major economic losses. Therefore, the operational safety and reliability issues of IGBT modules have become increasingly prominent. [0003] Most IGBT failures in actual systems undergo a gradual development process. IGBT status monitoring technology uses various detection and analysis methods to monitor various variables that reflect the operating status of the device, and evaluates the current operating status of the device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/27
CPCG01R31/27
Inventor 向大为张忻庾
Owner 阆芯上海电子科技有限公司
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