A Low-Cost Non-Isolated AC/DC Power Supply Design and Analysis for Embedded Systems

This paper presents a low-cost, effective and reliable Pulse-Frequency Modulation (PFM) based non-isolated AC/DC power supply design for Embedded Systems, Internet of Things (IoT) based applications, and home appliances. Anyone can use this power supply easily in any application where the Direct Current (DC) load is within 3 Watts. The operating input range of this Power Supply is 85-265V AC as well as it works perfectly with both 50Hz and 60Hz lines, so this system will work globally without any compatibility issue. It generates 12V and can supply 250mA of current relentlessly. Further 5V and 3.3V conversions can be done with a linear voltage regulator as per the requirement. In this design, we'll use the DIP-7 package of PN8034 chip from Wuxi Chipown Micro-electronics, China as a PFM Switching Controller. We'll describe the Schematic design, components selection, output ripple correction, PCB Layout design as well as the complete Power Supply Design which will be a suitable low-cost power solution for embedded systems and applications.