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Des résistances haute performance pour vos missions les plus critiques

Le talent dont fait preuve Exxelia Ohmcraft pour concevoir et livrer des résistances sur mesure est indispensable aux fournisseurs de matériel militaire.

Resistances Haute Performance pour vos missions les plus critiques 

Exxelia Ohmcraft satisfait les exigences de la guerre électronique moderne, des plateformes d’armes et des militaires de profession. Nous avons compris que l’innovation est un élément essentiel du succès en tant que fournisseurs s’adressant aux armées actuelles. Exxelia Ohmcraft approvisionne le marché militaire depuis plus de vingt ans et apporte un soutien sans faille à une large gamme de produits, programmes et applications. Dans ce domaine où la technologie prime, nos produits, standard comme sur mesure, sont bien placés pour répondre aux spécifications rigoureuses attendues de la part des fournisseurs de matériel militaire.

Une conception sur mesure pour les applications militaires

Le talent dont fait preuve Exxelia Ohmcraft pour concevoir et livrer des résistances sur mesure est indispensable aux fournisseurs de matériel militaire. Nos ingénieurs collaborent étroitement avec vous afi n de fabriquer des produits qui correspondent parfaitement à vos att entes.

  • Résistances de surface, diviseurs de tension et réseaux
  • Grande expérience dans la concepti on de résistances sur mesure et la prise en charge des SCD (Source Control Drawings, dessins de contrôle à la source) pour les plans déjà existants comme pour les nouveaux
  • Petits lots à destination de prototypes ou fabrication à grande échelle

Exxelia Ohmcraft est capable de tester des pièces selon plusieurs spécifications militaires, dont :

  • MIL-PRF-55342, 83401, 55182H, 914B et 49462B
  • MIL-STD-129, 1276F et 1285F
  • MIL-STD-202 • Résistances pour environnement spatial
  • Vaste plage de température
  • Mise au point rapide de prototypes

Nos suggestions de resistances : 

Chez Exxelia Ohmcraft, nous disposons d'une large gamme de résistances robustes et de haute performance. Voici quelques suggestions : 

- HIGH VOLTAGE LEADED DIVIDERS RESISTORS  (HVD SERIES)

- HIGH VOLTAGE AXIAL RESISTORS (HVA SERIES)

- MILITARY GRADE HIGH VOLTAGE CHIP RESISTORS (MCH SERIES)

Vous voulez en savoir plus sur nos produits militaires ?

TÉLÉCHARGEZ NOTRE FLYER ICI

Published on 03 May 2021 by Valentine Taffineau

Countering Threats from Transients in Magnetics

Understanding Electrical Transients in Magnetics Electrical transients are sudden, short-duration spikes in voltage or current. They can arise from various sources such as lightning strikes, switching operations, or inherent instabilities within the system. These transients can cause severe stress on magnetic components, leading to potential malfunctions or catastrophic failures.   Causes of Electrical Transients Electrical transients can originate from external factors like environmental conditions or input/output operations. Internally, they can be caused by the natural response of the system's reactive components: resistors, inductors, and capacitors. These components, governed by the laws of physics, react to changes in state variables, resulting in oscillations, amplification, or decay of signals.   Effects on Magnetic Components Magnetic components, such as transformers and inductors, are particularly susceptible to transients. For instance, transformers can exhibit parasitic components that affect their response to sudden voltage or current changes. These parasitic elements can cause amplification, oscillation, or even breakdown under transient conditions.   Mitigating Transient Threats Effective mitigation of transient threats involves understanding the behavior of magnetic components under dynamic conditions and implementing design strategies to counteract these effects.   Component Functions and Response Resistors: Dissipate energy to manage power levels. Inductors: Generate opposing voltages to slow current changes. Capacitors: Absorb or release charge to stabilize voltage changes. The induced voltage and current in inductors and capacitors are inversely proportional to the circuit's time constant. A smaller time constant means faster energy transfer, which can lead to higher transient voltages or currents.   Transformer Design Considerations Transformers must be designed to handle dynamic impedance transformations and provide necessary isolation. Realistic transformer models must account for parasitic components, which can significantly influence their behavior during transients. High voltage transformers, for instance, are prone to series resonance due to leakage inductance and self-capacitance, leading to oscillations and potential saturation.   Practical Mitigation Techniques High Bandwidth Instruments: Use to detect latent transient amplification and persistent ringing during normal operations. Worst Case Analysis: Evaluate bias currents and flux density for worst-case scenarios, including maximum voltage and temperature conditions. Current Transformer Verification: Ensure that protection circuits can detect transient overcurrents despite reduced output due to saturation. Residual Magnetization Control: Verify that residual magnetization does not impair operation, ensuring sufficient headroom for magnetization. Design of Experiments (DOEs), Risk Reduction Tests (RRTs), and Accelerated Stress Tests (ASTs): Implement these throughout the design stages to mitigate risks effectively. Protective Components: Use components like MOVs (Metal Oxide Varistors) to safeguard circuits from lightning-induced transients.   Countering threats from transients in magnetics requires a thorough understanding of the underlying causes and the implementation of robust design strategies. By employing high bandwidth detection instruments, performing worst-case analyses, and integrating protective measures, engineers can significantly reduce the risk of transient-induced failures in magnetic components. Adopting a proactive approach to design and testing ensures the resilience and reliability of electrical systems in the face of transient threats.

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REGISTER NOW  (registration will open on December 12, 2021)   Our goal: to help you in the design of your electrical projects. Our answer: to offer you an exchange with our experts where we can present you in details this new technology, but also to be able to exchange with us.      Also get our white paper around our revolutionary new Miniature Micro-Layer™ (MML™) technology that offers the highest capacitance per volume in film capacitors available on the market, by filling out the form.  
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