EI-J epoxy encapsulated power transformer is an extended product of the in-line circuit board, and the product is encapsulated with epoxy resin potting technology with good insulation performance, moisture-proof, flame retardant, and high electrical strength, and its durability and stability are superior to those of ordinary transformers. It is mainly used in industrial control, household appliances, medical equipment, instrumentation, and aerospace fields, as well as various PCB circuit boards.