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Design and Analysis of Sigma Z-Source Inverter for PV Applications

SRM Institute Of Science And Technology-Kalaiarasi Nallathambi, Uthra Rangarajan, Anitha Daniel
  • Technical Paper
  • 2019-28-0123
To be published on 2019-10-11 by SAE International in United States
Traditional Voltage Source Inverter (VSI) produces lesser output voltage than the input and cause shoot-through due to the gating of the semiconductor device connected in same leg. These inadequacies can be overcome by Z-source inverter (ZSI). The ZSI has been extensively used in applications such as electric drives, PV system and uninterrupted power supply. Nevertheless, the conventional ZSI grieves from limitations such as restricted boost capability, discontinuous input current and high inrush current. An alternative for this limitation is to use a transformer replacing inductors in the impedance source network. In high-voltage gain applications, the single transformer-based ZSI topologies requires more turns ratio resulting in large transformer windings. For improving the boost capability, the T-ZSI uses two transformers in the Z-source network and this permits lower turns ratio transformer to be used. Similar to the single transformer-based ZSI topologies, the turn ratio of the T-ZSI is raised to increase the voltage gain. In this paper, an alternative topology of T-ZSI that incapacitates the shortcomings of having high turns ratio to increase the boost capability is…

Requirements for Plastic Encapsulated Discrete Semiconductors in Military and Avionics Applications

CE-12 Solid State Devices
  • Aerospace Standard
  • AS6294/4
  • Current
Published 2019-07-09 by SAE International in United States
This standard documents and establishes common industry practices, and screening and qualification testing, of plastic encapsulated discrete semiconductors (PEDs) for use in military and avionics application environments.
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LED Signal and Marking Lighting Devices

Signaling and Marking Devices Stds Comm
  • Ground Vehicle Standard
  • J1889_201907
  • Current
Published 2019-07-01 by SAE International in United States
This SAE Recommended Practice applies to functions of motor vehicle signaling and marking lighting devices which use light emitting diodes (LEDs) as light sources. This report provides test methods, requirements, and guidelines applicable to the special characteristics of LED lighting devices. This Recommended Practice is in addition to those required for devices designed with incandescent light sources. This report is intended to be a guide to standard practice and is subject to change to reflect additional experience and technical advances.
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Graphene-Silicon Devices for Optoelectronics Applications

  • Magazine Article
  • TBMG-34628
Published 2019-06-01 by Tech Briefs Media Group in United States

Silicon is a naturally occurring material commonly used as a semiconductor in electronic devices; however, researchers have exhausted the potential of devices with semiconductors made of silicon only. These devices are limited by silicon’s carrier mobility — the speed at which a charge moves through the material — and indirect bandgap, which limits its ability to release and absorb light.


Standardized Symbols for Electrical Circuit Diagrams

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2221_201905
  • Current
Published 2019-05-16 by SAE International in United States
This SAE Recommended Practice identifies graphic symbols used in electrical circuit diagrams. The symbols aid troubleshooting electrical systems.
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Process for Assessment and Mitigation of Early Wearout of Life-Limited Microcircuits

APMC Avionics Process Management
  • Aerospace Standard
  • ARP6338A
  • Current
Published 2019-02-08 by SAE International in United States
This document is intended for use by designers, reliability engineers, and others associated with the design, production, and support of electronic sub-assemblies, assemblies, and equipment used in AADHP applications to conduct lifetime assessments of microcircuits with the potential for early wearout; and to implement mitigations when required; and by the users of the AADHP equipment to assess those designs and mitigations. This document focuses on the LLM wearout assessment process. It acknowledges that the AADHP system design process also includes related risk mitigation and management; however, this document includes only high-level reference and discussion of those topics, in order to show their relationship to the LLM assessment process.
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Aircraft Cabin Illumination

A-20C Interior Lighting
  • Aerospace Standard
  • AIR512G
  • Current
Published 2018-11-05 by SAE International in United States
This document covers the general recommendations for cabin lighting in order to provide satisfactory illumination for, but not limited to, commercial transport aircraft: a Boarding and deplaning b Movement about the cabin c Reading d Use of lavatories e Use of work areas f Using stowage compartments, coat rooms, and closets g Using interior stairways and elevators (lifts) h Use of crew rest areas
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Transient Stability Analysis of DC Solid State Power Controller (SSPC) for More Electric Aircraft

JiaWei Zhang
University of Nottingham-Jeevan Adhikari, Tao Yang, Mohamed Rashed, Serhiy Bozhko, Patrick W. Wheeler
Published 2018-10-30 by SAE International in United States
The solid state power controller (SSPC) is one of the most important power electronic components of the aircraft electrical power distribution (EPS) systems. This paper presents an architecture of the DC SSPC and provides the mitigation techniques for transient voltage overshoot during its turn-off. The high source side inductance carries breaking current (9xnominal current) just before turnoff and induces large voltage transient across the semiconductor devices. Therefore, the stored inductive energy needs to be dissipated in order to prevent semiconductor switches from over-voltage/thermal breakdown. Three different transient voltage suppression (TVS) devices to reduce voltage stress across switches are included in the paper for detail study. The comprehensive comparison of the TVS devices is presented. In addition, the thermal impact of the TVS devices on the semiconductor switches is also analyzed. Later, the transient simulation model of the SSPC is built in LT-Spice and the effectiveness of the proposed protection mechanisms is verified.
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Development of Atmospheric Neutron Single Event Effects Analysis for Use in Safety Assessments

S-18D AIR6219 SEE Working Group
  • Aerospace Standard
  • AIR6219
  • Current
Published 2018-08-08 by SAE International in United States
This document provides an example process for analyzing neutron Single Event Effects (SEE) for an electronic based airborne system for use in system safety assessments. This example has been used when the safety assessment process was in need of a SEE analysis.
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Auxiliary Power Solutions for 1500 VDC Photovoltaic Systems

  • Magazine Article
  • TBMG-32506
Published 2018-08-01 by Tech Briefs Media Group in United States

Photovoltaic systems are continually evolving to improve their efficiency and financial viability. One trend is to move to larger strings of cells giving higher dc voltages to be converted to ac voltage for the grid. Cost savings result, but auxiliary power supplies for monitoring and control need to accept these higher voltages as inputs.