论文信息 - A voltage doubling AC-DC converter with offset-controlled comparators for piezoelectric energy harvester

A voltage doubling AC-DC converter with offset-controlled comparators for piezoelectric energy harvester

A highly efficient active voltage doubling rectifier with wide input range for micro-piezoelectric energy harvesting systems is proposed in this paper. By replacing the passive diodes in Dickson charge pump with offset-controlled comparator-based active counterparts, the proposed rectifier minimizes voltage drop along the conduction path and solves the reverse leakage problem caused by delay and mismatch of the conventional active diode. Based on SMIC 0.18μm standard CMOS process, the proposed rectifier is simulated and implemented. The measured results show that the rectifier can operate properly with input amplitudes from 0.2 V to 1.0V and frequencies from 20Hz to 3000Hz. With a 200Hz input of 0.6V amplitude, the proposed rectifier can achieve the peak power conversion efficiency (PCE) of 92.5%. When the input amplitude is greater than 0.3V and load resistance larger than 20kΩ, the voltage conversion efficiency (VCE) of at least 93% can be achieved.

Wei Tu | Zhangming Zhu | Yintang Yang | Lianxi Liu | Junchao Mu

[1] E. Nakamachi,et al. Development of enhanced piezoelectric energy harvester induced by human motion , 2012, 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[2] Maurits Ortmanns,et al. A CMOS integrated voltage and power efficient AC/DC converter for energy harvesting applications , 2008 .

[3] Yintang Yang,et al. A highly efficient interface circuit for ultra-low-voltage energy harvesting , 2013, IEICE Electron. Express.

[4] Zhangcai Huang,et al. A sub-0 . 3 V highly efficient CMOS rectifier for energy harvesting applications , 2012 .

[5] Hoi Lee,et al. An Efficiency-Enhanced CMOS Rectifier With Unbalanced-Biased Comparators for Transcutaneous-Powered High-Current Implants , 2009, IEEE Journal of Solid-State Circuits.

[6] Nobutaka Kuroki,et al. 1.2-V Supply, 100-nW, 1.09-V Bandgap and 0.7-V Supply, 52.5-nW, 0.55-V Subbandgap Reference Circuits for Nanowatt CMOS LSIs , 2013, IEEE Journal of Solid-State Circuits.

[7] Maysam Ghovanloo,et al. An Integrated Power-Efficient Active Rectifier With Offset-Controlled High Speed Comparators for Inductively Powered Applications , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.