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A Multi-Input Single Inductor Multi-Output
Energy Harvesting Platform
Energy harvesting is the process by which energy is derived from external
sources captured, and stored for small, wireless autonomous devices, like those used
in wearable electronics and wireless sensor networks. Energy harvesters usually
provide a very small amount of power for low-energy electronics.
Today We will be discussing about the power management unit that meets the
need of small-form-factor net-zero energy systems by aggregating the maximum
available power from three different energy sources while simultaneously regulating
three output power rails over a wide dynamic load range, while also managing the
charging and discharging of a battery, all in a single stage single-inductor converter.
The proposed architecture uses hysteresis control to regulate the voltage of each
harvester at their respective maximum power points (MPPs) using pulse-frequency
modulation (PFM) and adaptive inductor ON-time.