Abdul Basit Mirza;Andrew Castiblanco;Abdul Muneeb;Yang Xie;Sama Salehi Vala;Fang Luo
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引用次数: 0
Abstract
Silicon Carbide (SiC) MOSFETs and Schottky diodes in the TO-247 package are economical options for chopper (buck/boost) and half-bridge configurations, which are fundamental building blocks for various power converter topologies. However, the fast switching of SiC implies high $\text{d}\boldsymbol{v}/\text{d}\boldsymbol{t}$ and $\text{d}\boldsymbol{i}/\text{d}\boldsymbol{t}$, imposing a constraint on the PCB portion of power loop inductance in minimizing voltage overshoot during the turn-OFF transient. Although the vertical PCB power loop layout effectively reduces the PCB loop inductance, it increases the PCB parasitic capacitance. Due to the considerable lead inductance of the TO-247 package, this PCB capacitance is paralleled to the device's output capacitance through the package lead inductance, altering the switching transient. This article analyzes the effect of PCB capacitance on turn-OFF switching transient and ringing in chopper and half-bridge configurations with SiC devices in the TO-247 package. Initially, small-signal models incorporating PCB capacitance are derived. Subsequently, these models are validated in the frequency domain, and the switching transients are compared through double pulse test (DPT) on two PCB prototypes with the same layout but different stack-ups, yielding different PCB capacitances. Further, a comparative study of the proposed models with direct parallel approximation of PCB and device output capacitance is presented. Finally, the proposed small-signal models are analyzed to establish criteria, in terms of TO-247 lead and PCB loop inductance, for minimizing the impact of PCB capacitance on switching transients.
期刊介绍:
The scope of the IEEE Transactions on Industry Applications includes all scope items of the IEEE Industry Applications Society, that is, the advancement of the theory and practice of electrical and electronic engineering in the development, design, manufacture, and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; industry leadership in energy conservation and environmental, health, and safety issues; the creation of voluntary engineering standards and recommended practices; and the professional development of its membership.