Dielectric Strength
Specialized laminate material provides enhanced insulation properties for circuits operating at potentials exceeding several hundred volts. A high voltage substrate is designed with resin systems and reinforcements that resist electrical breakdown and surface tracking. These boards are essential for power electronics, electric vehicle chargers, industrial power supplies, and medical imaging equipment.
Tracking Resistance
Comparative tracking index measurements define how well the material surface prevents the formation of conductive paths under moisture and contamination. A high voltage substrate often features a high rating in this area, typically exceeding 600 volts, to ensure long term reliability in harsh environments. The glass transition temperature is also kept high to prevent the resin from softening and losing its resistive qualities during thermal cycles.
Proper chemical composition prevents internal delamination that could host micro-arcs.
Application Boundaries
Structural integrity must be maintained even when the electric field strength approaches the dielectric limit of the material. In a high voltage substrate, the distance between internal layers is carefully controlled to prevent punch-through failures. Creepage and clearance distances are calculated based on the specific breakdown voltage of the laminate used.
Manufacturers often perform partial discharge testing to find microscopic voids in the resin that could lead to eventual failure. This material choice allows for more compact power supply designs without sacrificing safety or performance.
