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Novel Solid Tantalum Capacitor for Demanding Applications up to 200C
Keywords: tantalum capacitor, high temperature, downhole industry
Capacitors are one of the key parts of any electronic device and system. The main functions of capacitors include power supply voltage smoothing, supporting energy sources when high current pulse is demanded, blocking a DC voltage in signal pathes, filtering, etc. To assure required functionality of a system we cannot omit capacitors and it is valid for high temperature applications as well. In oil and gas mining industry a high temperature capacitors are needed for DC/DC converter of drilling heads that are subjected to rising ambient temperature with depth. Thus the higher permitted operating temperature of used capacitor and other passive and active parts, the deeper situated resources are accessible. Typical aerospace and defence applications include engines and turbo fan control as well as control and sensing electronics placed near outer shells of rockets and space shuttles. A key requirement here is reliability under harsh conditions. Automotive applications such as size reduced gearboxes or embedded alternators/starters require reliability and long life at elevated temperatures. Solid tantalum capacitors have been known for their excellent reliability, robustness and stable parameters. Hence this is very suitable capacitor technology for further research and development targeting enhancing operating temperatures up to 200degC. This paper describes a novel 200degC capacitor concept and technical development & processes of enhancing operating temperature of solid tantalum capacitor. Stability of the main capacitor parameters at high ambient temperature is essential condition for valuable product.
Radovan Faltus, Field Application Engineer
AVX Czech Republic S.R.O.
Lanskroun, Pardubicky kraj 56301,
Czech Republic

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