A method for real-time identification of abnormalities in the cooling system of igbt modules
A cooling system, abnormal technology, applied in the direction of instruments, material thermal development, measuring devices, etc., can solve the problems of vehicle performance degradation, damage to motors and inverters, and achieve the effect of avoiding damage
Active Publication Date: 2020-03-06
SHANGHAI DAJUN TECH
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Problems solved by technology
Based on the gradual popularization of new energy vehicles, the IGBT module cooling system of the inverter is the most important part of the entire vehicle power system. If the cooling system is abnormal, the power of the motor and inverter will be limited, and the performance of the vehicle will be affected. Greatly reduced, it may damage the motor and inverter in severe cases
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[0012] Example figure 1 As shown, the method for identifying the abnormality of the cooling system of the IGBT module in real time of the present invention includes the following steps:
[0013] Step 1. When the cooling system is not connected to the cooling liquid or the cooling liquid is negligible, test the temperature rise coefficient of the IGBT module at each current. With the current as the abscissa and the temperature rise coefficient as the ordinate, the IGBT module changes with the current. Temperature rise coefficient curve a;
[0014] Step 2. When the cooling system is fed with the minimum capacity coolant that meets the minimum requirements of the cooling system, but the cooling pump does not work and the coolant does not flow, test the temperature rise coefficient of the IGBT module at each current, taking the current as the abscissa , The temperature rise coefficient is the ordinate, and the temperature rise coefficient curve b of the IGBT module changing with ...
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The invention discloses a method for recognizing the abnormality of an IGBT module cooling system in real time, and the method comprises the steps: testing the temperature rise coefficients of an IGBT module at all currents under the condition that the cooling system hardly has cooling liquid, and obtaining a current / temperature rise coefficient curve a; testing the temperature rise coefficients of the IGBT module at all currents under the condition that the cooling system meets the minimum requirements, and obtaining a current / temperature rise coefficient curve b; plotting the curve a and curve b in a coordinate system, setting a part above the curve a as an abnormal region A of the cooling system, setting a part below the curve b as a normal region C, and setting a part between the curve a and the curve b as an early warning region B; detecting the current and temperature rise coefficients of the IGBT module in real time, comparing the coordinate systems of the curves a and b, and recognizing the abnormality of the cooling system. The method judges whether the cooling system is abnormal or not according to different work conditions of the cooling system and the corresponding currents of the IGBT module, sets the early warning region, uploads the abnormal information, and protects a motor and an inverter from being damaged.
Description
technical field [0001] The invention relates to a method for real-time identification of abnormalities in the cooling system of an IGBT module. Background technique [0002] The IGBT module is a composite fully-controlled voltage-driven power semiconductor device composed of a bipolar transistor and an insulated gate field effect transistor, which is widely used in power drive components in inverters. Based on the gradual popularization of new energy vehicles, the IGBT module cooling system of the inverter is the most important part of the entire vehicle power system. If the cooling system is abnormal, the power of the motor and inverter will be limited, and the performance of the vehicle will be affected. It is greatly reduced, and in severe cases, the motor and inverter may be damaged. Therefore, a method that can identify the abnormality of the cooling system of the IGBT module in real time is particularly important, so that the abnormality of the cooling system can be d...
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IPC IPC(8): G01R31/00G01N25/20
Inventor 侯留业雷小军徐性怡
Owner SHANGHAI DAJUN TECH