SINGLE INDUCTOR DC-DC CONVERTER WITH REGULATED OUTPUT, ENERGY STORAGE AND ENERGY HARVESTING SYSTEM

摘要

An energy harvesting circuit (240') receives an input voltage from a transducer and uses a single inductor (L) operating in a DC-DC converter charging mode to generate charging current at a plurality of storage outputs (252(1), 252(2)) coupled to respective energy storage devices where a supply voltage is stored. The circuit further receives the supply voltage from the energy storage devices and uses the same single inductor operating in a DC-DC converter regulating mode to generate load current at a load output (254) where a regulated load voltage is provided. To this end, the circuit (240') comprises a set of switches (S1-S8) that can be actuated for selective connection of the inductor in a buck-boost mode to charge the energy storage devices, and in a regulating mode to generate load current to provide a regulated output voltage to the load output. The control circuit is configured to control switching between the charging mode and the regulating mode in accordance with a discontinuous mode (DCM) hysteretic control process.