如何判断igbt的好坏（How to judge the quality of IGBT）.docVIP

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如何判断igbt的好坏（How to judge the quality of IGBT）.doc

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如何判断igbt的好坏（How to judge the quality of IGBT）

如何判断igbt的好坏（How to judge the quality of IGBT） Polarity of judgment The multimeter dial in R * 1K block, measured with a multimeter, the black pen connected in a fixed electrode, a pen (red pen) are respectively connected with the other Two pins, if the resistance are infinite, to call the red pen in the fixed electrode (the original black pen pins connected), another one (the black pen) are respectively connected with the other two pins, if the resistance are infinite, then fixed the probe connected to the pins to the gate. The remaining two Very then multimeter, if the measured resistance is infinite, the resistance change after one smaller measurement. When the resistance is smaller, the red is judged The probe connected to the drain (D); the black probe connected for source (S). Judge good or bad The multimeter dial in R * 10K block, drain connected with the black pen of IGBT (D), the red pen is connected with IGBT source (S), then the pointer multimeter At infinity. With fingers touching both the gate (G) and the drain (D), the IGBT is triggered and the pointer of the meter swings to the resistance A smaller direction, and can stand at a certain position. Then touch the source (S) and the gate (G) with your fingers, and then the IGBT is blocked Break, the pointer of the multimeter goes back to infinity. At this point you can judge that IGBT is good. Note: if the second measurement is made, the source (S) and the gate (G) should be shorted. Any pointer type multimeter can be used to detect IGBT. Note that when judging IGBT good or bad, you must dial the multimeter in R * 10K Omega block, for R * 1K Omega block the following multimeter, the internal battery voltage is too low, good or bad when testing can not make IGBT conduction, and can not judge the quality of IGBT. This method is the same It can also be used to detect power field effect transistors (P-MOSFET). IGBT profile The basic structure of 1.IGBT Insulated gate bipolar transistors (IGBT) are essentially