A 87.8% Peak Efficiency SIDO Energy Harvesting System with Emergency Power Supply Mode and Hybrid Zero-Current Detector

This paper proposes a single-inductor dual-output (SIDO) buck-boost DC-DC converter that effectively harvests thermoelectric energy in discontinuous conduction mode (DCM). In addition, the proposed emergency power supply mode (EPSM) improves the maximum output power by more than 18%. A storage capacitor (C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">STO</inf>) recycles the remaining energy in the inductor during off-Time (T<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</inf>) to minimize output ripple. Furthermore, a hybrid zero-current detector (H-ZCD) with 800 nW power consumption is designed to reduce power losses. The proposed converter provides two regulation outputs, while achieving a peak efficiency of 87.8% with an input voltage range from 0.1 V to 0.4 V and a load range from 10 μW to 7000 μW.