A Novel Interface Circuit with 99.2% MPPT Accuracy and 1.3% THD for Energy Harvesting

摘要

To improve conversion efficiency and output quality of the energy harvester, a novel interface circuit with composite maximum power point tracking (MPPT) in energy harvesting applications is proposed in this paper. By using the ultra-low-voltage multiplier with digital control and simple one-cycle variable frequency technique, the converter realizes fast power tracking and high conversion efficiency, and minimizes the power consumption and harmonics, thereby obtaining high tracking precise and low total harmonic distortion (THD). Implemented in 65-nm CMOS process, this converter achieves 85.9% peak power efficiency with dc output voltage of 1.6 V. The peak tracking efficiency and THD are 99.2% and 1.3%, respectively. The peak output power is 18.31 mu W, and the power loss of the entire converter is only 16.53 mu W.