Online detection system and method for IGBT (Insulated Gate Bipolar Translator) module working junction temperature

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 junction temperature of chips, high working voltage and current, and failure of high-power converter systems.

Active Publication Date: 2019-08-09
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 co...

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  • Online detection system and method for IGBT (Insulated Gate Bipolar Translator) module working junction temperature
  • Online detection system and method for IGBT (Insulated Gate Bipolar Translator) module working junction temperature
  • Online detection system and method for IGBT (Insulated Gate Bipolar Translator) module working junction temperature

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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 online detection system and method for an IGBT (Insulated Gate Bipolar Translator) module working junction temperature. The system comprises a power conversion topological unit, a driving unit, a signal collection unit, an excitation unit and a control unit, wherein the signal collection unit collects the target parameter of the power conversion topological unit; the control unit determines the switching state of an IGBT module to be detected on the basis of the target parameter; when main power current does not flow through the IGBT module to be detected, saturationvoltage drop which flows through a freewheel diode and is collected by the signal collection unit is obtained; and on the basis of the saturation voltage drop, the working junction temperature of theIGBT module to be detected is determined. Obviously, by use of the online detection system for the IGBT module working junction temperature, when the main power current does not flow through the IGBTmodule to be detected, the excitation unit is controlled to output excitation current, the saturation voltage drop which flows through the freewheel diode and is collected by the signal collection unit is obtained, the working junction temperature of the IGBT module to be detected is determined on the basis of the saturation voltage drop, and a function of online junction temperature detection isrealized.

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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IPC IPC(8): G01R31/26
CPCG01R31/2601G01R31/2619
Inventor 王航王富
Owner SUNGROW POWER SUPPLY CO LTD
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