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Study of Replacing the Traditional Electromechanical Relay with the Full Semiconductor Solution of Bussed Electrical Center

Infineon Technologies China Co., Ltd.-Ning Shen, Xingwei Wang
Pan Asia Technical Automotive Center-Xia Tian
Published 2019-04-02 by SAE International in United States
To face the challenges of CO2 emission and automated driving, the electrical distribution system (EDS), as the basis of all electronic loads, needs to be continuously changed. Traditional bussed electrical center (BEC) has limited functions such as simple switch and fuse protection, while the full semiconductor solution of smart BEC can provide more accurate diagnosis, faster response, higher reliability with lower power loss and smaller space.This paper will introduce the practical function of the smart BEC: in normal operation of the car, the voltage and current of the loads can be detected by the smart BEC. Once in abnormal, immediate feedback will be transferred from smart BEC to the whole system and a related response will be triggered in time, while the cost of power harness can also be optimized. In parking mode, the quiescent current of the loads from KL30 can be detected by smart BEC, which could prevent against leakage.Automated driving is a hot topic, many people focus on functional safety and redundancy of the actuators in the car, which can only be…
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Understanding the “Black Art” of RF and Microwave Switching

Aerospace & Defense Technology: April 2019

  • Magazine Article
  • 19AERP04_06
Published 2019-04-01 by SAE International in United States

Understanding RF, especially microwave switching, can be a challenge. In many cases, test systems have been compromised because a test engineer did not consider all the components of their test system: instruments, switching, cabling, Mass Interconnect (test fixture interface), fixture design, and so on. Each component has its own set of characteristics. With RF and microwave components, effects including insertion loss, VSWR, bandwidth, and so on all need to be considered as well.

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Understanding the “Black Art” of RF and Microwave Switching

  • Magazine Article
  • TBMG-34126
Published 2019-04-01 by Tech Briefs Media Group in United States

Understanding RF, especially microwave switching, can be a challenge. In many cases, test systems have been compromised because a test engineer did not consider all the components of their test system: instruments, switching, cabling, Mass Interconnect (test fixture interface), fixture design, and so on. Each component has its own set of characteristics. With RF and microwave components, effects including insertion loss, VSWR, bandwidth, and so on all need to be considered as well.

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Torque, Threaded Application, Electrical Connector, Accessory and Terminal Board Installation

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AIR6151B
  • Current
Published 2019-03-05 by SAE International in United States
This SAE Aerospace Information Report (AIR) is intended to provide guidelines to tightening methods and torque values as applied to electrical connectors, related hardware and switches, relays, circuit breakers and A-A-59125 type terminal boards. The connectors and associated hardware discussed herein, are typically manufactured from aluminum alloy, high grade engineering thermoplastics or corrosion resistant steel and typically plated with a protective/conductive coating. These guidelines may be used where no rules have been mandated either contractually or otherwise.
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Heavy Duty Truck and Bus Electrical Circuit Performance Requirement for 12/24-Volt Electric Starter Motors

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J3053_201901
  • Current
Published 2019-01-31 by SAE International in United States
The scope of this SAE Recommended Practice is to describe a design standard to define the maximum recommended voltage drop for starting motor main circuits, as well as control system circuits, for 12- through 24-V starter systems.
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Primary Single Phase Nominal 120 VAC Wiring Distribution Assembly Design—Truck and Bus

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2698_201810
  • Current
Published 2018-10-04 by SAE International in United States
This SAE Recommended Practice covers the design and application of primary on-board wiring distribution system harnessing for surface vehicles. This document is intended for single phase nominal 120 VAC circuits that provide power to truck sleeper cab hotel loads so that they may operate with the main propulsion engine turned off. The power supply comes from alternative sources such as land-based grid power, DC-AC inverters and auxiliary power generators. The circuits may also provide power to improve vehicle performance through charging batteries or operating cold-weather starting aids.
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Converting Existing Copper Wire Firing System to a Fiber-Optically Controlled Firing System for Electromagnetic Pulsed Power Experiments

  • Magazine Article
  • TBMG-29083
Published 2018-06-01 by Tech Briefs Media Group in United States

After extensive review from the US Army Research Laboratory (ARL) Electrical Safety Office, it was determined that the existing firing system in Experimental Facility 167 (EF 167) was not adequate to safely perform pulsed-power experiments with gunpowder- or air-driven guns. This firing line used solid copper wire, which provided a continuous electrical conduction path between the high-voltage capacitor in the test chamber and the firing/control room, where personnel are stationed when experiments are performed (Figure 1). This poses a safety risk since high voltage can travel from the test chamber and potentially result in personnel injuries and damaged equipment.

Auto-Zero Differential Amplifier

  • Magazine Article
  • TBMG-29057
Published 2018-06-01 by Tech Briefs Media Group in United States

Engineers in the NASA Goddard Space Flight Center Instrument Electronics Development Branch have developed a chopper-stabilized auto-zero amplifier capable of amplifying signals with extremely small amplitude originating from a thermopile-based infrared (IR) sensor. The instrument is self-adjusting in that it corrects for offset shifts caused by total ionizing dose (TID). It is therefore suitable for use in environments with high TID and large fluctuations in TID, such as those found in the Jupiter system. This technology allows for the manufacture of radiation-hardened amplifiers with low offset and noise.

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Simulation of Arc Quenching in Hermetically Sealed Electric Vehicle Relays

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

Esgee Technologies-Anand Karpatne, Douglas Breden
University of Texas at Austin-Laxminarayan Raja
  • Journal Article
  • 2018-01-0765
Published 2018-04-03 by SAE International in United States
The goal of this work is to investigate arc quenching in electric vehicle relays using high-fidelity computational modeling. Rapid arc quenching is an essential quality of state-of-the-art high-voltage mechanical relays in electric vehicles. As a relay begins to break electrical contact, strong arcing can occur. This delays the process of sending a signal to the primary circuit breaker to isolate the load from a sudden current surge. The strength and duration of the arc have a significant impact on the safety of electric vehicles as well as on relay contactor erosion/lifetime. A thermal plasma modeling tool is used to estimate switch-off time in an arc relay using hydrogen and air as working gases. The response of arc dynamics and switch-off time to the gas composition, external magnetic field strength, and chamber pressure is studied. It was observed that a hermetically sealed chamber filled with hydrogen is significantly more efficient than air at quenching the arc. A stronger magnetic field was seen to enhance arc stretch to the wall which rapidly quenches the arc. Further, decreasing…
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Selection and Application of Electro-Mechanical Relays for Proper Performance

AE-7P Protective and Control Devices
  • Aerospace Standard
  • ARP4005C
  • Current
Published 2017-11-14 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) provides information to guide in the selection of electromechanical relays to be used in electrical/electronic circuits for application in aerospace, ground, and shipboard systems to achieve proper performance.
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