An Event-Driven Multi-Input Multi-Output Buck­Boost Converter with Adaptive MPPT for Wide Power Range RF Energy Harvesting

This paper proposes a buck-boost converter that is event-driven multi-input multi-output (EDMIMO). The adaptive maximum power point tracking (MPPT) is achieved by utilizing a linear search of fraction open-circuit voltage (FOCV) and the wide power range operation is accomplished by applying binary search of power switch size. The net output power of the converter is measured by considering the conduction loss, switching loss, and control circuit power dissipation. The proposed converter is implemented in a 180 nm TSMC CMOS process. The input power range is from -24 dBm to 6 dBm with a dynamic range of 1000X. The MPPT efficiency is higher than 95% and the power conversion efficiency is more than 73 % with a peak of 85% over the entire input power range.