Power over Ethernet (PoE) has been developed for many years since 2003. Driven by the technological progress of the times, the current PoE technology has also reached the ability to supply more than 70W to power receiving equipment. With the help of high power, the function of powered equipment is greatly improved, and devices using Power over Ethernet can output power and data signals through twisted pairs at the same time, and the application of large-size high-power passive components in POE circuits has increased significantly.