Medium Voltage Bidirectional DC-DC Isolator using Series Connected 10kV SiC MOSFETs

Parashar, Sanket; Kumar, Ashish; Kolli, Nithin; Kokkonda, Raj Kumar; Bhattacharya, Subhashish

doi:10.1109/apec39645.2020.9124526

Cited by 18 publications

(5 citation statements)

References 9 publications

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“…At the same time, the voltage stresses of the switches also become unbalanced, and overvoltage across devices will occur if the imbalance is severe. The DAB/DAB3 converters with NPC bridge cells have been carried out for PV generation systems [90]- [93], the bidirectional fast electric vehicle (EV) chargers [96], the interfaces of grid to microgrid [99], battery interface systems [101], [105], airborne wind turbines [103] and SSTs [104], [109].…”

Section: ) Npc Bridgesmentioning

confidence: 99%

“…The capacitor voltages were balanced by adjusting the dead time, and the voltage balance control is decoupled from flux balance. NPC bridges with clamped diodes are also used in a DAB3 converter in [99]. Reference [100] extended the three-level NPC DAB converter to an n-level NPC DAB converter with considerably reduced dv/dt through increased components.…”

Section: ) Npc Bridgesmentioning

confidence: 99%

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Review of Dual-Active-Bridge Converters With Topological Modifications

Sha

et al. 2023

IEEE Trans. Power Electron.

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Section: ) Npc Bridgesmentioning

confidence: 99%

Section: ) Npc Bridgesmentioning

confidence: 99%

Review of Dual-Active-Bridge Converters With Topological Modifications

Sha

et al. 2023

IEEE Trans. Power Electron.

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“…The balancing resistor (R B ) is used to implement the static voltage balancing across series-connected SiC MOSFETs [31]. The dynamic voltage balancing (DVB) across series-connected 10kV SiC MOSFETs and 10kV SiC JBS diodes is implemented using R-C snubber [31] - [32].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the turn-off timing of series-connected SiC MOSFETs should be precise to avoid oscillation due to overvoltage clamping. The t d,ij adjustment has been used for minimizing overvoltage across series-connected SiC MOSFETs in 3L-NPC inverter with isolated heat sink, under normal operating condition[37]-[38]. Fig.1(b)shows the layout of twelve C bs,M ij in a 3L-NPC pole, which leads to higher turn-off voltage mismatch due to uneven C bs,M ij charging during switch failure, compared to normal operation.…”

mentioning

confidence: 99%

Overvoltage Protection of Series-Connected 10kV SiC MOSFETs Following Switch Failures in MV 3L-NPC Converter for Safe Fault Isolation and Shutdown

Parashar,

Isik,

Kolli

et al. 2024

IEEE Access

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This paper presents a design methodology for overvoltage protection across 10kV SiC MOSFETs during turn-off after switch failure in a MV SST Power Conditioning System (PCS) enabled by a cascaded Three-Phase (3P) Three-level (3L) Neutral Point Clamped (NPC) Active Front-End Converter (AFEC) and Dual Active Bridge (DAB) using series-connected 10kV SiC MOSFETs and 10kV SiC JBS diodes. The methodology uses an active voltage clamp at the gate terminal and desat detection technique to identify abrupt open and turn-on switch failures across series-connected 10kV SiC MOSFETs. The analytical model estimates over-current time and turn-off voltage transition by considering bus bar inductance, device base plate capacitance and common mode (CM) choke tied between the heat sink and midpoint of the DC link capacitor. The transition model is used to evaluate the turn-off timing for series-connected MOSFETs, snubber resistors, snubber capacitors, and gate resistors to avoid MOSFET overvoltage during converter shutdown, without affecting the voltage balancing and efficiency during normal operation. The MOSFET turn-off transition during the shutdown has been verified in the Saber RD simulation using the validated Saber RD MAST model of 10kV SiC MOSFETs and 10kV SiC JBS diodes at 13.8kV AC/24kV DC level. The fault isolation and MV SST PCS shutdown have been verified in a real-time environment using HIL setup with Xilinx FPGAs and RTDS, at 13.8kV AC/24kV DC link under PCS operating conditions. The normal operation of 3L-NPC pole hardware with modified snubber resistors, snubber capacitors, and gate resistors is verified by experiments conducted at 7kV DC, 10A load current.

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“…In most of these battery charger designs, a high efficiency isolated DC-DC converter is key for battery charging. And therefore, LLC and Dual Active Bridge (DAB) converters are becoming popular due to their high efficiency operation [12]. Fig.…”

Section: Introductionmentioning

confidence: 99%

EMC Implications of Implementing WBG Devices in Battery Charger Modules for Electric Vehicles

Martínez

Lin

Suarez

2022

2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)

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GaN and SiC semiconductor devices have the potential of drastic downsizing of power converters in applications where size is strictly limited like in electromobility. In electric powertrains, on-board chargers need to operate in a wide voltage and power range limited by the battery and its conditions. In this context, both size and voltage-power range can be achieved through the effective utilization of GaN and SiC devices. Nevertheless, although GaN and SiC devices offer outstanding features in fast transitions, low on-resistances, and the ability to switch faster, these characteristics can generate much higher EM emissions that can affect the charger operation. Consequently, additional circuitry is required to mitigate such emissions although it can jeopardize the ultimate goal of compactness.In this paper, trasients, ringing, harmonic content, and conducted emissions in both GaN and SiC Devices and use of magnetic components is analyzed. Such analysis is conducted with experimental tests under real conditions of battery charging for Electric Vehicles.

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Medium Voltage Bidirectional DC-DC Isolator using Series Connected 10kV SiC MOSFETs

Cited by 18 publications

References 9 publications

Review of Dual-Active-Bridge Converters With Topological Modifications

Review of Dual-Active-Bridge Converters With Topological Modifications

Overvoltage Protection of Series-Connected 10kV SiC MOSFETs Following Switch Failures in MV 3L-NPC Converter for Safe Fault Isolation and Shutdown

EMC Implications of Implementing WBG Devices in Battery Charger Modules for Electric Vehicles

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