Power transformer is a soft magnetic electromagnetic component with functions such as power transmission, voltage conversion, and insulation isolation. It is widely used in power supply technology and power electronics technology.

According to the size of the transmitted power, the power transformer can be divided into several levels: 10kVA or above is high power, 10kVA~0.5kVA is medium power, 0.5kVA-25VA is low power, and below 25VA is micro power.