A Novel Re-configurable LLC Converter for Electric Aircraft

Bhattacharya, Sumantra; Willich, Caroline; Hoenicke, Pia; Kallo, Josef

doi:10.1109/ecce-asia49820.2021.9479165

Cited by 8 publications

(9 citation statements)

References 12 publications

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“…In addition to the obvious cost and reliability problems due to the double number of switches, these converters often need to employ several expensive sensors to detect faults on individual switches. The converter presented in [27,28], proposes the use of a resonant L-C converter and configuring it from a full-bridge (FB) into a half-bridge (HB) mode and then using a capacitive and transformer voltage doubler to regain the output voltage. The converter is also equipped with multiple reconfiguration techniques to achieve fault tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…The converter is also equipped with multiple reconfiguration techniques to achieve fault tolerance. The concepts used in [28] are used in this paper along with some modifications in the circuit and control algorithm to make it suitable for low-voltage and high-current applications.…”

Section: Introductionmentioning

confidence: 99%

“…Topologically, an HB can only produce half of the voltage of an FB configuration. Hence, if the secondary side had not been reconfigured, the voltage gain of the converter would be halved [28]. This difficulty is mitigated by the transformer employed in this converter.…”

mentioning

confidence: 99%

“…The proposed converter can only withstand a fault in one of the switches on the primary side. If a failure is detected in the secondary side switches, the secondary can be also reconfigured as mentioned in [28]. However, this is not included in the scope of this paper and is not discussed.…”

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confidence: 99%

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Design and Demonstration of a 540 V/28 V SiC-Based Resonant DC–DC Converter for Auxiliary Power Supply in More Electric Aircraft

2022

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Efficient and robust power electronic converters are vital to the success of the electrification of aircraft. Especially, low voltage auxiliary converters, which usually supply high current and low voltage loads, are not readily available industrially and need special attention. In terms of energy density and efficiency, LLC converters are among the most commonly used and efficient topologies for automotive and aerospace applications. In the case of aerospace applications, a fault-tolerant topology is highly desirable to reduce the need for redundant components and weight by removing backup systems. To solve this issue, this study introduces a new 2.0 kW LLC-based converter with a reconfigurable fault-tolerant architecture. With the help of a specially designed secondary side, the proposed converter can reconfigure itself so that even if one of the semiconductor switches fails permanently, the converter can still maintain power at nominal voltage levels, ensuring that the aircraft’s vital functionality is preserved. This paper also describes the basic operation principle, component-design aspects, conduction loss reduction techniques, and control system algorithm. Finally, a 2.0 kW experimental prototype is built to verify and demonstrate the operation of the proposed reconfigurable LLC converter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Design and Demonstration of a 540 V/28 V SiC-Based Resonant DC–DC Converter for Auxiliary Power Supply in More Electric Aircraft

2022

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“…In [27], the concept of converter-level reconfigurability to achieve fault tolerance for the neutral-point-clamped (NPC) converter with an extra flying capacitor (FC) leg is explored. In [28], [29], reconfigurable DC-DC converters and the principle of achieving fault-tolerance are explained. Also, a review of reconfigurability and redundancy are well explored in [30], [31].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurability, Modularity and Redundancy Trade-offs for Grid Connected Power Electronic Systems

Ahmadi

Shekhar

Bauer

2022

2022 IEEE 20th International Power Electronics and Motion Control Conference (PEMC)

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Power electronic converters (PECs) are workhorses of emerging distribution networks. PEC interfaced grids can function as flexible power corridors facilitating compact and efficient energy exchange between distribution generation, load and storage elements. Introducing adequate Reconfigurability, Modularity, and Redundancy (RMR) in such PEC-driven hybrid ac-dc distribution networks can enhance power delivery, thus enabling infrastructure savings. In this paper, an approach for implementing adequate RMR is introduced that can be applied at both converter-and system-level; therefore, the system's reliability can be improved. Furthermore, in this discussion, the impact of integrating renewable energy sources, charging stations and storage systems with the grids is considered with regard to the methodologies of applying RMR to improve the reliability. Potential applications include various power electronics converters, parallel ac-dc links, embedded PEC energy routers, dc hubs, and multi-parallel converter systems capable of regulating power flows between different nodes in the grid with fault-tolerant topologies.

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