Schott Poweramic™ glass-ceramics: a new class of dielectrics for high voltage capacitors

  Science & technology

Schott Poweramic™ is a new class of glass-ceramic materials offering extraordinarily high energy storage density in combination with excellent temperature characteristics for smaller and lighter weight high voltage capacitors.

Schott
Glass-ceramics as dielectrics in capacitors provide a high energy storage density for an extended temperature range
International technology group Schott has developed a new dielectric material - Poweramic™, which is a family of highly homogenous, pore-free glass-ceramics. Providing very high energy storage density, these materials show excellent dielectric properties even at elevated temperatures. In high voltage applications this allows for smaller, lighter weight passive components such as capacitors to deliver a more powerful performance.
Capacitors are passive electrical components that store energy in the form of an electrostatic field in the dielectric material between metal contacts. They are commonly used to buffer, stabilize or couple the voltage and power flow in electric power conversion systems. High voltage capacitors are becoming increasingly required; for example in Excimer Lasers for industrial and medical applications, for medical x-ray equipment, for high voltage power supplies (HVPS) for industrial applications, and for grids for renewable energy.
Higher voltages and current densities, however, lead to an increasing thermal load. Current capacitor technologies for high power applications are mostly based on polypropylene (PP) or N4700 ceramic. Both are limited to temperatures below 90°C due to either their loss of capacitance (N4700) or their loss of reliability (PP) with rising temperatures. Schott’s new class of Poweramic™ materials shows a superior performance regarding energy storage density and dielectric properties in an expanded temperature range.
Poweram...


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