A single inductor tri-input dual-output buck-boost DC-DC converter with MPPT for multi-source energy harvesting

Energy harvesting is an attractive technique of getting energy from environment and extending battery lifetime for remote wireless sensor networks (WSN), wearable biomedical electronics, and internet of things (IoT). In such a system, it delivers all harvested energy directly to the load with surplus energy recycled in the battery. Accordingly, power management in this energy harvesting system contributes a balance among the PV module, TEG module, battery and load. This work proposes a single inductor tri-input-dual-output buck-boost converter (SITIDOBB) that manages energy harvesting (PV and TEG), energy storage, and power rail regulation of the multi-source energy harvesting. It has been designed using 0.18μm CMOS process. With a quiescent power of 10μW, the designed SITIDOBB converter shows a simulated peak efficiency of 92% at 12mW output power.