source: Softei news
Dedicated pulse discharge multi-layer ceramic (MLC) chip capacitors for use in harsh environments, such as munitions, ordinance, and oil field exploration and perforation, are available from Knowles Capacitors. The Novacap capacitors offer the reliability afforded by ceramic multi-layer fabrication using advanced ceramic and electrode formulations, with thin, dense and precise dielectric layers, explains Knowles. Energy density exceeds that of conventional Class 1 materials and offers excellent short duration pulse delivery at temperatures to 200°C.
These high temperature, high energy, capacitors are manufactured with a dielectric formulation designed for reliable operation under single or repetitive high energy, multiple pulse, firing into typical exploding foil initiator (EFI) and low energy EFI (LEEFI) circuits where resistive loads are in the 0.10 to 0.25-Ohm range. Discharge pulse width, which is typically less than 100-nano seconds, will vary with load conditions which are influenced by inductive and resistive load components, says Knowles Capacitors.
With exceptionally low equivalent series resistance (ESR) and low signal distortion, additional applications at high temperature include power supply filtering, energy storage and coupling/decoupling.
All parts are 100 per cent pulse screen tested and are evaluated at temperature extremes up to 200 degrees C, performance parameters consistent with munitions and oil field exploration/seismic detonation conditions. As an added safety feature, the pulse energy capacitors can be supplied with integral bleed resistors at various resistance values.
The MLC chip capacitors are offered in chip sizes 1825 to 7565. Other sizes, voltages and capacitance ratings are available in single, series and series/parallel arrangements for custom applications. All are claimed to provide exceptional discharge energy at elevated voltages. A 500-MOhm safety bleed resistor is standard but other values are available.
Novacap’s design engineers are available to help meet specific requirements.
Dielectric Laboratories (DLI), Novacap, Syfer Technology and Voltronics came together to form Knowles Capacitors, and have since been joined by Johanson Manufacturing. Today, the entity has a combined history of over 200 years.