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Thermal overload protection method, device and system for power electronic equipment

A power electronics and thermal overload technology, applied in the field of power electronics, can solve the problems of IGBT module burning and inaccurate test results, and achieve the effect of avoiding burning and accurate test results.

Inactive Publication Date: 2014-04-02
SHENZHEN INVT ELECTRIC
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Problems solved by technology

[0005] In view of this, the present invention provides a thermal overload protection method for power electronic equipment to overcome the problem in the prior art that the instantaneous junction temperature of the IGBT is represented by detecting the radiator temperature, and the test result is inaccurate, which leads to the burning of the IGBT module

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] Please refer to the attached figure 1 , is a flowchart of a thermal overload protection method for power electronic equipment provided by the present invention, the method realizes overload protection by detecting the junction temperature of the IGBT, and includes the following steps:

[0036] S101: Determine the loss P of the IGBT in the power electronic device to be tested igbt and diode losses P diode .

[0037] An IGBT module as a power switching d...

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Abstract

The invention provides a thermal overload protection method for power electronic equipment. The thermal overload protection method comprises the following steps of determining the loss of an insulated gate bipolar transistor (IGBT), the loss of a diode and the thermal impedence of the IGBT in the power electronic equipment to be detected and detecting the current temperature of a radiator, wherein the thermal impedence comprises thermal impedence between an IGBT junction and a shell and thermal impedence between the shell and the radiator; then calculating the junction temperature of the IGBT in the power electronic equipment to be detected according to a preset formula; finally judging whether the junction temperature is higher than the preset temperature, if so, stopping sending an IGBT driving signal to make the IGBT stop working. Therefore, the thermal impedence between the IGBT junction and the shell and the thermal impedence between the shell and the radiator are detected by the method; compared with a method for over-temperature protection of an IGBT module by detecting the temperature of the radiator in the prior art, the method has the advantages that a detection result is more accurate, an alarm is given during the over-temperature of the IGBT, and the burn of the IGBT module is avoided.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a thermal overload protection method, device and system for power electronic equipment. Background technique [0002] In power electronic devices, the IGBT module has become an irreplaceable power switching device, and the thermal effect generated during the working process is also inevitable. [0003] At present, the overheating protection of the IGBT module is mainly to collect the heat sink temperature of the IGBT module through the thermistor, and then realize the overheating protection according to the temperature. However, the inventor found that due to the different thermal characteristics of different materials, and the thermal response speed of the IGBT module is fast, the temperature change is large, while the radiator responds slowly to the heat and the temperature change is small, that is, the temperature of the radiator cannot repre...

Claims

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Application Information

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IPC IPC(8): H02H7/20H02H5/04
Inventor 张波吴淑良狄鹏
Owner SHENZHEN INVT ELECTRIC
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