Dual-Path CCM Boost Converter Optimization for Indoor Light Energy Harvesting in Biomedical Devices

This study presents the design of a Continuous Conduction Mode (CCM) Boost Converter with a dual-path circuit configuration that integrates a supercapacitor for electrocardiogram (ECG) devices, using 65nm CMOS technology. The boost converter effectively increases the battery-powered input voltage from the solar source, ranging from 0.15 V-0.4 V to a stable output of 0.7 V, ensuring reliable power delivery to ECG devices. Key performance metrics include a peak efficiency of 84.85% with ideal components and 69.54% with non-ideal components. The dual-path architecture enhances efficiency, achieving 83.40 % when switching from primary to secondary paths and maintaining 84.33 % during secondary path operation. The system demonstrates significant improvements in line regulation, from 2.195m V/m V of the traditional approach to 0.000014 mV/mV with the dual-path and load regulation improvement from 1.4562mV/mA to 0.019713 mV/mA, coupled with reduced voltage ripple (<1 %), minimizing the output voltage surge. The designed boost converter has a total chip area of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.61mm^{2}$</tex>, supplying a load current of 1.14 mA and an output power load of 801.90 μW, sufficient to power electrocardiograms.