A Tri-Mode Reconfigurable DC-DC Converter With Photovoltaic Energy Harvesting for Miniature IoT Batteries

초록

This brief proposes a reconfigurable DC-DC converter for an energy-harvesting system with a tri-mode recharging method for miniature Internet of Things (IoT) batteries operating at various temperatures. The proposed system and IoT battery operate at temperatures as low as -5 degrees C with an internal resistance (R-INT) of up to 1.9 k Omega. The proposed recharging method utilizes a low-dropout regulator and DC-DC converter with a negative inductor current to rapidly recharge a storage capacitor (C-STOR) and isolate the IoT battery from the C-STOR. With a 180 nm CMOS process, the charge of the C-STOR can be restored rapidly with the aid of the IoT battery, which reduces the ratio of the activation time (t(ACT)) to the recharging time (t(RCHG)) to 0.27 at -5 degrees C.

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