HIGH -VOLTAGE POWER DEVICES WITH FIELD LIMITING RINGS

摘要

PURPOSE: A power device for resisting high pressure having a field-limiting ring is provided to improve the breakdown voltage by adding a floating ring only in the edge region so as to prevent an electric field from concentrating into the edge region. CONSTITUTION: A plurality of field-limiting rings(24) are added on a substrate(22) by decreasing the distance between the field-limiting rings(24). The distance between the field-limiting rings(24) in the square region of the substrate(22) is designed in consideration of cylinder coordinates, while the distance in the edge region of the substrate(22) is designed in consideration of circular coordinates, so that a transition region is formed. By adding floating rings(24, 25) in the edge region, the dispersion of electric field is improved and the value of the maximum electric field is decreased.