Energy harvesters generate power only when ambient energy is available, and power loss\nis significant when the harvester does not produce energy and its power management circuit is still\nturned on. This paper proposes a new high-efficiency power management circuit for intermittent\nvibration energy harvesting. The proposed circuit is unique in terms of autonomous power supply\nswitch between harvester and storage device (battery), as well as self-start and control of the\noperation mode (between active and sleep modes). The self-start controller saves power during an\ninactive period and the impedance matching concept enables maximum power transfer to the\nstorage device. The proposed circuit is prototyped and tested with an intermittent vibration energy\nharvester. Test results found that the daily energy consumption of the proposed circuit is smaller\nthan that of the resistive matching circuit: 0.75 J less in sleep mode and 0.04 J less in active mode\nwith self-start.
Loading....