The design and measurement of test system for dynamic characteristics of IGBT

With the fast development of power electronic technology, voltage source converter based on IGBT have been widely used in the field of high voltage direct current (HVDC) and IGBT are more and more widely utilized. So, Studying on the characteristics of IGBT is more and more important. The static characteristic of IGBT can be got from the Datasheet, but the dynamic characteristic must be got by experiment. So, How to get the accurate waveform of the dynamic characteristic is significant. In this paper, How to design the test circuit based on double-pulse method is proposed, also how to decide all the parameters in the circuit and how it work are elaborated deeply. We focus on some important factors, such as the oscillation frequency of the LC loop, the time constant of load inductance during discharging, the change rate of the bus voltage. Then, an experimental platform has been built for FF450R17ME4 IGBT module of Infineon. On the basis of experimental platform, We analyze the key problems in the measurement of dynamic characteristics by theoretical analysis and experimental verification, such as, the waveform of Vce, Ic during the whole experimental period. The comparison of several ways to measuring voltage and current is given. In order to exclude the electromagnetic interference, eliminate the matching influence of the measuring probe and ensure the waveform is accurate, A shielding box is used and we analyze the influencing factor one by one through experiment. Then, the standard measurement is given ultimately.