Research

3-D Converter-Level Packaging with TO-247 SiC Devices

• Three-faced utilized heat sink for a 75 kVA grid interface bi-directional converter, providing a 35 % reduction in heat volume compared to a 2-D layout.
• Cylindrical holes for heat dissipation, facilitating cost-effective fabrication.

PCB Power Loop Layout Optimization for TO-247 SiC Devices

• Vertical power layout, a common approach to lower PCB parasitic inductance \(L_\text{PCB}\) to limit voltage overshoot.
• However, PCB parasitic inductance \(<<\) TO-247 lead inductance and PCB capacitance \(C_\text{PCB}\) becomes the dominant factor impacting the switching transient.

• Small-signal models, incorporating \(C_\text{PCB}\), for ringing frequency estimation.

Simplified Analytical Modeling of Reflected Wave Transients in Two-Level Motor Drives with Output Reactor

• Output reactor, the standard approach for reflected wave mitigation in cable-connected drives up to 300 ft.
• However, for reflected wave estimation, the user has to resort to computationally expensive simulations.
• A lumped circuit model based on dominant pole approximation proposed with closed-form expressions for peak motor-side overvoltage and drive-side overcurrent, and slew-rates (\(\text{d}v/\text{d}t\) and \(\text{d}i/\text{d}t\)).

Two-Level Split-Phase Topology for Enhanced Reflected Wave Suppression in Two-Level Cable-Connected Drives

• Output reactor in Two-Level (2L) drives lowers the motor-side voltage’s slew rate (\(\text{d}v/\text{d}t\)) with a slight reduction in overvoltage peaks.
• Two-Level Split-Phase (2L-SP), which has a similar structure to 2L, provides enhanced reflected wave suppression without the need for additional hardware or control due to its lower output \(\text{d}v/\text{d}t\).
• Same power device count for both configurations if anti-parallel diode is used for 2L.

Evaluation of Common Mode (CM) Conducted EMI in Two-Level Split-Phase Topology

• CM EMI modeling for 2L-SP topology.
• Two CM voltage sources, compared with the standard 2L topology, exhibit alternating lower \(\text{d}v/\text{d}t\) transitions, resulting in lower CM EMI.
• Extent of CM EMI reduction in HF approximately linear with split inductance \(L_\text{d}t\).

Non-Invasive Health Monitoring for DC-DC Converters

• Performance evaluation of Particle Swarm Optimization and Genetic Algorithms for Digital Twin (DT)-based health monitoring.
• Faster convergence with Genetic Algorithm.

• Practical implementation of DT-based health monitoring for a four-phase interleaved converter of a 75 kVA grid-interface bidirectional converter.

Integrated Magnetics for Interleaved Boost Converter

• Gapped E-core-based structure with decoupled CM and DM inductances.

Partial Discharge Testing in Motors Fed by Voltage Source PWM Motor Drives

• Evaluation of PWM waveform characteristics on Partial Discharge Inception Voltage (PDIV) in twisted pairs at different pressures.

Isolated Active Voltage Injection-Based MVDC Hybrid Circuit Breaker

• Hybrid Circuit Breaker (HCB), comprising an electro-mechanical switch (EMS) in series with Voltage Injector Building Block (VIBB).
• E-core-based integrated magnetic structure for injection.
• Miniscule post-fault interruption residual energy.