Feature: Military
Figure 2: High-voltage mica paper capacitors
Mica capacitors offer high insulation resistance, which helps prevent electrical leakage and ensures reliable operation in demanding environments. This property is particularly advantageous in aerospace and defence systems where reliability is paramount
compounds, such as epoxy resins, are commonly used to encapsulate electronic assemblies, providing mechanical robustness, thermal management and EMI shielding. High-voltage applications demand additional considerations
to mitigate potential risks associated with insulation breakdown and electrical arcing. Insulating materials like silicone or polyurethane are used to coat and encapsulate high-voltage components, forming a protective barrier against electrical faults and environmental contaminants. Moreover, strategic design practices, including proper spacing and creepage distances, ensure compliance with safety standards and mitigate the risk of electrical hazards. EMI shielding emerges as a paramount concern in power
electronic controllers, especially in applications sensitive to electromagnetic disturbance. Shielding techniques, ranging from metallic enclosures to conductive coatings, effectively
40 May 2024
www.electronicsworld.co.uk
contain electromagnetic emissions and prevent interference with neighbouring electronic systems. Careful design and placement of shielding components, coupled with thorough testing and validation, guarantee compliance with stringent electromagnetic compatibility standards. Overall, highly reliable and high-performance power electronic
systems with advanced semiconductors, mica capacitors and robustly-designed packaging offer many benefits for the aerospace, defence and other industries. Reliable power systems are crucial for mission success. Tey ensure that critical equipment operates optimally, thereby enhancing operational effectiveness. Dependable power systems contribute to maintaining high operational readiness of electric assets. Tey reduce the risk of equipment failure and downtime, ensuring that systems are always prepared for deployment and can respond swiſtly to emerging threats. High reliability reduces the need for repairs, resulting in reduced maintenance costs, leading to lower life-cycle costs. Tis results in significant savings of time, manpower and resources required for upkeep, allowing defence budgets to be allocated more efficiently. Robust power systems enhance the safety of personnel by minimising the risk of accidents and malfunctions caused by power-related failures. Tis is particularly important in high-risk environments during operations involving hazardous materials or equipment. In essence, the evolution of power electronic systems hinges on
continuous innovation in assembly techniques and encapsulation methodologies. Engineers and manufacturers alike strive to push the boundaries of reliability, efficiency and performance, harnessing the potential of advanced materials and design practices. As demands for clean energy and electrification escalate, the role of power electronic controllers becomes increasingly pivotal, driving progress towards a sustainable and interconnected future.
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