A system and method for online detection of working junction temperature of igbt module

A technology of working junction temperature and detection system, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as power consumption and high chip junction temperature, high-power converter system failure, IGBT damage, etc.

Active Publication Date: 2021-10-22
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0003] However, in the high-power converter system, the working voltage and current of the power module IGBT are relatively high, which leads to high power consumption and chip junction temperature. Once the temperature is too high, the IGBT will be damaged, which will lead to high-power conversion. device system failure

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  • A system and method for online detection of working junction temperature of igbt module
  • A system and method for online detection of working junction temperature of igbt module
  • A system and method for online detection of working junction temperature of igbt module

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Embodiment Construction

[0047] As mentioned in the background technology, in the high-power converter system, the operating voltage and current of the power module IGBT are relatively high, which leads to high power consumption and high chip junction temperature. Once the temperature is too high, the IGBT will be damaged, which will lead to High power converter system failure.

[0048] Therefore, it is necessary to detect the working junction temperature of the IGBT module. Commonly used IGBT module working junction temperature detection methods include:

[0049] ①Physical contact measurement method:

[0050]Use temperature measuring elements such as thermistors or thermocouples to measure the internal ambient temperature or external case temperature of the IGBT module. However, the temperature measurement point in this method is generally at a certain distance from the IGBT module, resulting in large measurement errors. In addition, the response speed of temperature measurement is slow (second le...

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Abstract

The invention provides an IGBT module working junction temperature online detection system and method. The system includes: a power conversion topology unit, a drive unit, a signal acquisition unit, an excitation unit and a control unit. Wherein, the signal collection unit collects target parameters of the power topology unit. The control unit determines the switching state of the IGBT module to be tested based on the target parameters, and when the IGBT module to be tested does not flow through the main power current, obtains the saturation voltage drop of the freewheeling diode collected by the signal acquisition unit, based on the saturation voltage drop , to determine the working junction temperature of the IGBT module to be tested. It can be seen that the IGBT module working junction temperature online detection system provided by the present invention can control the excitation unit to output the excitation current when the IGBT module to be tested does not flow through the main power current, and obtain the freewheeling diode collected by the signal acquisition unit. Based on the saturation voltage drop, the working junction temperature of the IGBT module to be tested is determined, and the function of online detection of the junction temperature is realized.

Description

technical field [0001] The invention relates to the technical field of equipment detection, in particular to an online detection system and method for the working junction temperature of an IGBT module. Background technique [0002] The converter is a device commonly used in the power generation system to convert the AC power on the grid side into DC power, and then convert the DC power into AC power on the motor side. It includes a plurality of parallel semiconductor switches. - Conversion of direct current. Specifically, the semiconductor switch may be a device having a switching function such as an IGBT, an IGCT, and an IEGT. IGBT is widely used due to its static characteristics such as high voltage blocking capability, low turn-on voltage drop and high current density, and dynamic characteristics such as short switching time, low switching loss and high tolerance. [0003] However, in the high-power converter system, the working voltage and current of the power module ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26
CPCG01R31/2601G01R31/2619
Inventor 王航王富
Owner SUNGROW POWER SUPPLY CO LTD
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