Abstract
The modeling of conduction and switching losses for insulated gate bipolar transistors (IGBTs) and free-wheeling diodes (FWDs) in automobile applications is becoming increasingly important, especially for the improvement of the system efficiency and the reliability prediction. The traditional modeling of conduction and switching losses based on the space vector pulse width modulation (SVPWM) is not applicable in practice due to the complex curve-fitting and the computation demands. In this paper, a simple and practical losses model for IGBTs and FWDs is proposed based on the SVPWM algorithm. Firstly, the traditional power losses model is introduced briefly. Then, the piecewise linear switching losses model and the conduction losses model based on the equivalent three-order harmonic model of the duty cycle are proposed. The comparison of experimental results between the traditional model and the proposed model is presented in the experiment validation. Furthermore, the power analyzer is adopted to measure the inverter losses, and the chips losses are further validated when other extra losses are considered. The proposed model shows good modeling accuracy with the large benefit of smaller measurement and lower computation requirements.
Highlights
The permanent magnet synchronous motor (PMSM) is widely used in electric vehicles due to its high power density and excellent control performance [1,2,3], and it is usually driven with the pulse width modulation (PWM) inverters
5. it provides a basis for the accurate junction temperature prediction of insulated gate bipolar transistors (IGBTs)
Considering the flow directions of three phase currents, the conduction losses of IGBT and free-wheeling diodes (FWDs) based on the PWM period are listed in Tables 1 and 2
Summary
The permanent magnet synchronous motor (PMSM) is widely used in electric vehicles due to its high power density and excellent control performance [1,2,3], and it is usually driven with the pulse width modulation (PWM) inverters. Tofollows: solve the piecewise integration of conduction losses, the piecewise periodic functions of the as duty cycle are derived and studied, and the equivalent three‐order harmonic model of the duty the waveform the collector–emitter voltage drop and the collector current cycle Considering is proposed based on Fourierofseries expansion. The simplified conduction losses model has at the instant of switching during the inverter operation, a piecewise linear model is proposed the advantages of the lower computation requirements and the easy engineering to simplify the real waveform to avoid the complex fitting and interpolation process. To solve the piecewise integration of conduction losses, the piecewise periodic functions junction temperature prediction of IGBTs. duty cycle are derived and studied, and the equivalent three-order harmonic model of the duty instant of switching. Test setup andbased experimental inSection the automobile electrical application, results aremodulation presented in
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