Increasingly, military vehicles are provisioned with electronics for control, communications, navigation and display systems. DC-DC converters provide auxiliary power for these systems but can be subject to high electrical and environmental stress in the application. This article outlines the stress levels defined by the common standards used and identifies the specifications that DC-DC converters need to meet.
Electric Vertical Take-Off and Land (eVTOL) aircraft for freight and passenger use are a natural progression from the drone technology that is now commonplace. However, reliability in these new applications is a prime consideration and core to this is maintenance of power to flight control and navigation electronics under fault conditions. In this article we look at some auxiliary DC power supply architectures, their characteristics and practical implementations for high reliability and availability.
Electric Vertical Take-Off and Land (eVTOL) vehicles are set to proliferate in the coming few years. As in other aerospace applications, safety is paramount, normally requiring multiple layers of hardware redundancy. eVTOL craft however must be as lightweight as possible, so a trade-off has to be made between acceptable reliability and hardware complexity. This e-guide considers the situation, particularly with regards to power conversion electronics.
This paper describes the design and implementation of a compact and high-frequency LLC converter with wide input voltage range (from 220 V to 320 V), output power range (from 250 W to 1.5 kW), high efficiency (over 96 % at full power), high power-density (32 kW/dm 3 ) and narrow frequency variations (15 %)…
This paper exposes the analysis, modeling and comparison of two different LLC converter configurations: the conventional LLC converter and the Three-Phase Y−Δ LLC converter, which is firstly analyzed in this paper…
Aircraft applications are in continuous need to reduce equipment volume to optimize fuel and weight. Power converters are an essential part of this volume since electric distribution has either AC and DC buses…
COTS evaluation – COTS qualification – Design of space converter:
Option 1: 3D stacking,
Option 2 : Open frame,
Quality assurance…
This article describes the approach used to design a hardened power supply capable of operating to a total gamma irradiation dose of 1Mrad(Si). Pre-irradiation of power MOSFETs proved to be necessary, and the paper also discusses the effects of this treatment…