A 0.3-V Ultralow-Supply-Voltage Boost Converter for Thermoelectric Energy Harvesting with Time-Domain-Based MPPT

This letter proposes a boost converter with ultralow-voltage time-domain control for thermoelectric generators (TEG). A subthreshold 0.3-V voltage supplied control system is constructed using time domain and constant on-time approach. The maximum power point tracking (MPPT) is realized using fractional open-circuit voltage scheme. The proposed converter is implemented in a 0.13-μm CMOS process. The measured minimum TEG open circuit voltage which can maintain harvesting is 80 mV. The power consumption of the control circuit is down to 840 nW. The peak end-to-end efficiency is 72.1% at 170-mV open circuit voltage where the input power is 34.4 μW.