Modeling, Design, and Evaluation of Active $\mathrm{\text{} d }v/\mathrm{\text{} d }t$ Balancing for Series-Connected SiC MOSFETs
| Autor: | Dushan Boroyevich, Dong Dong, Emma Raszmann, Jun Wang, Keyao Sun, Rolando Burgos, Xiang Lin |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Power Electronics. 37:534-546 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2021.3100246 |
| Popis: | Series connection of SiC MOSFET s provides an effective alternative to achieving higher blocking voltage with simpler circuit topologies. However, the voltage imbalance during the switching transient remains a critical issue. Recently, an active $\mathrm{\text{} d }v/\mathrm{\text{} d }t$ control approach utilizing a controllable equivalent Miller capacitor has been proved to be an effective, low-loss, and compact solution. This article renders an improved control circuit with comprehensive modeling and analysis. First, the original circuit is modified with an additional bipolar-junction-transistor and pulsed control signal so that the external capacitor can be fully reset every switching cycle. Second, a simplified model of the active $\mathrm{\text{} d }v/\mathrm{\text{} d }t$ control is derived to unveil the linear correlation between the control voltage and the device $\mathrm{\text{} d }v/\mathrm{\text{} d }t$ during the turn- off transient. Third, a feedback control model is described by difference equations for stability analysis, offering parameter selection guidelines for the control process. Fourth, experimental results with two series-connected SiC MOSFET s under 1.5-kV dc-link voltage are demonstrated to validate the open-loop control model and closed-loop stability. Finally, the control method is expanded to eight series-connected devices under 6 kV to prove its scalability and potential for medium-voltage high-current applications. |
| Databáze: | OpenAIRE |
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