Abstract
This article presents the utilization of DPWM for the online condition monitoring of SiC power MOSFET switching at high switching frequencies in a three-phase inverter prototype. Due to the settling time imposed by the monitoring system, accurate measurements require low switching frequency and high modulation indexes when monitoring. To overcome these limitations, a DPWM strategy is proposed. This way, the monitored device does not switch during a certain time, and hence, the accuracy of the measurements is not compromised. The effect of the alteration of the modulation is analyzed in terms of power losses and current ripple, comparing the traditional with the proposed modulation. Moreover, online monitoring results performed in a SiC-based inverter prototype in different operating points are presented. An $R_{\mathrm {DS}}$ -based thermal model is presented in order to estimate online the junction temperature.
Highlights
Nowadays, the integration of wide-bandgap (WBG) semiconductor devices in power electronics industry is experiencing a huge increase
In order to overcome these issues, condition monitoring has been proposed as a way to predict failures and enhance the reliability of power electronics systems [5]
There, power modules and electrolytic capacitors were considered as the components most susceptible to failure, while condition monitoring was identified as an interesting trend to improve system reliability
Summary
The integration of wide-bandgap (WBG) semiconductor devices in power electronics industry is experiencing a huge increase. The use of discontinuous pulse-width modulation (DPWM) has already been proposed for different purposes, being it popular due to the reduction of switching losses This modulation has been employed to reduce thermal stress and enhance the lifetime [23], [24], [25] or to achieve higher efficiencies or power densities [26], [27], [28]. The use of a discontinuous modulation for the monitoring of power semiconductors in inverter systems is proposed This way, the measurements can be carried out during normal operation of the converter without interruption for monitoring purposes.
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