Power management system for Ethernet-based IoT devices

A novel four switches single inductor differential output synchronous buck converter architecture for the power-over-Ethernet (PoE) system is proposed in this paper. A powered device (PD) interface is designed to meet the PoE IEEE Std 802.3af. The proposed system is designed using 0.18 mu m CMOS technology and simulated using SIMUCAD. The simulation results show that the converter has a maximum efficiency of 95% at a switching frequency of 800 kHz. Also, it has a percentage of undershoot and overshoot less than 1% as the load current changes from 0.5 A to 1 A. Using a compensator increases the bandwidth from 61 kHz to 80 kHz and the phase margin increases from 20.7 degrees to 49.96 degrees. To validate the proposed converter architecture and design, a comparison between the proposed work and other reported architectures is provided. It shows that the proposed technique has the highest peak efficiency compared with others. (C) 2018 Ain Shams University.