Journal of Low Power Electronics and Applications

18 pages, 2349 KiB

Open AccessArticle

A High-Efficiency Piezoelectric Energy Harvesting and Management Circuit Based on Full-Bridge Rectification

by Shuhan Liu, Suhao Chen, Wei Gao, Jiabin Zhang, Dacheng Xu, Fang Chen, Zhenghao Lu and Xiaopeng Yu

J. Low Power Electron. Appl. 2024, 14(4), 49; https://doi.org/10.3390/jlpea14040049 - 8 Oct 2024

Viewed by 470

Abstract

This paper presents a high-efficiency piezoelectric energy harvesting and management circuit utilizing a full-bridge rectifier (FBR) designed for powering wireless sensor nodes. The circuit comprises a rectifier bridge, a fully CMOS-based reference source, and an energy management system. The rectifier bridge uses a PMOS cross-coupled structure to greatly reduce the conduction voltage drop. The CMOS reference source provides the necessary reference voltage and current. The energy management system delivers a stable 1.8 V to the load and controls its operation in intermittent bursts. Fabricated with a 110 nm CMOS process, the circuit occupies an area of 0.6 mm², and is housed in a QFN32 package. Test results indicate that under 40 Hz frequency and 4 g acceleration vibrations, the chip’s energy extraction power reaches 234

μ

W, with the load operating every 3 s at a supply voltage of 1.8 V. Thus, this FBR interface circuit efficiently harnesses the energy output from the piezoelectric energy harvester. Full article

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10 pages, 4646 KiB

Open AccessArticle

Energy Restoration in Data Drivers for Low-Power Digitally Driven OLEDoS Microdisplays

by Sheida Gohardehi and Manoj Sachdev

J. Low Power Electron. Appl. 2024, 14(4), 48; https://doi.org/10.3390/jlpea14040048 - 4 Oct 2024

Viewed by 418

Abstract

Microdisplays are widely used in near-to-eye (NTE) applications that operate with batteries, and reducing the power consumption of microdisplays is key to increasing their battery life. This paper proposes a digital data driver with a data energy recycling feature to reduce its dynamic power consumption. According to the measurement results obtained from a proof-of-concept array fabricated using TSMC 65 nm technology, the power consumption of the display data driver demonstrates an average reduction of 16% when tested with 10 random black-and-white images or a 14.4% decrease when evaluated using four real-life test images. Full article

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17 pages, 5175 KiB

Open AccessArticle

Reliability Enhancement Methods for Relaxation Oscillator with Delay Time Cancellation

by Kunpeng Xu, Hongguang Dai, Zhanxia Wu, Zhibo Huang, Guoqiang Zhang, Xiaopeng Yu, Wechang Wang and Gang Xuan

J. Low Power Electron. Appl. 2024, 14(4), 47; https://doi.org/10.3390/jlpea14040047 - 26 Sep 2024

Viewed by 518

Abstract

Relaxation oscillators are preferred in low-frequency applications due to their lower power consumption and superior temperature stability. However, frequency errors arise from variations in the comparator’s offset voltage and delay time due to PVT changes. To address these issues, this paper proposes the low-power delay time cancellation (DTC) technique and several enhancement methods, including a novel offset trimming approach, an error state detection and recovery (ESDAR) circuit, and a specialized frequency-trimming method. Simulation results for an 8 MHz relaxation oscillator in a 40 nm CMOS process show that the proposed DTC technique and enhancements improve frequency variation due to power supply fluctuations to ±0.05% and reduce temperature-induced frequency variation to ±0.4%. Full article

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J. Low Power Electron. Appl., Volume 14, Issue 4 (December 2024) – 3 articles

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