High voltage power supply materials evaluation

Tests that distinguish encapsulation materials for high-voltage power supplies are discussed in this paper and include voltage breakdown, concentric-cylinder, and miniwound transformer evaluation. These tests all yield information on the ability of encapsulation materials to meet high-stress electrical and differential thermal requirements common to high-voltage power supplies. In addition, tests with miniwound transformers evaluate the ability of encapsulation materials to fill microvoids of intricate designs and protect the device from high-voltage and differential thermal stresses.