KEMET recently announced the release of its ArcShield technology, which will be used for manufacturing a multilayer ceramic capacitor or MLCC with a X7R dielectric. The patent-pending ArcShield MLCCs will be ideal for high-voltage applications.
Issues related to arc-over discharge – also known as surface arcing, which is prominent in high-voltage applications – will be resolved using the ArcShield MLCCs. In the present scenarios, the capacitor and other components adjacent to the capacitor on a printed circuit board can be damaged due to the arc-over discharge.
Arc-over discharge can now be avoided with the ArcShield high voltage MLCCs.
Compared to the surface coating technologies commonly used to prevent surface arcing, these MLCCs are more dependable and affordable. The traditional surface coating technologies can be damaged while assembling and handling the printed circuit boards.
In this case, the device will behave similarly to a device without a protective coating, thereby increasing the capacitor’s susceptibility to arc-over discharge.
"ArcShield High Voltage MLCC technology features a unique, robust internal shield electrode system that suppresses arc-over while increasing capacitance to the highest values available in the industry,” said Bill Sloka, Specialty Product Manager at KEMET. “In addition to unrivaled performance and reliability when compared to external surface coating technologies, it offers downsizing opportunities for larger case size products with the same capacitance and voltage rating."
MLCCs are exposed to surface arcing when the application voltages touch 300 V. If there is a difference in the voltage between the termination surfaces of the MLCCs, the application voltages can surpass 300 V. Similarly, in the event of huge voltage difference between a termination surface and the internal electrode arrangement of the capacitor, the application voltage can surpass 300 V.
The dielectric material will normally break or harm the components in the adjacent area due to the arc-over phenomenon, causing a short-circuit situation.
Relative to standard termination systems, the Flexible Termination technology from KEMET ensures superior flex performance. Applications can utilize KEMET’s ArcShield MLCCs as snubbers in lighting and voltage multiplier devices. Cabin or under-hood applications can also use these capacitors that comply with Automotive Grade, thereby fulfilling the challenging AEC-Q200 prerequisites of Automotive Electronics Council.
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