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3-dimensional touch sensing and long battery lifetime are two desired attributes in interactive displays. By employing piezoelectric material and rectifier circuitry related technique, force touch induced charges are used for both force strength detection and energy harvesting, achieving 3dimensional touch sensing and extended battery lifetime at the same time for interactive displays.
An on-chip DC-DC converter for energy harvesting is proposed for a new battery-less solar cell tag applied to the Internet of Things (IoTs) devices. The main purpose of this design is to maximize the transfer efficiency and to stably provide a high enough supply voltage to the back-end loads. The overall circuit consists of a crosscoupled charge pump, a maximum power point tracking (MPPT) circuit,...
Energy harvesting is an attractive option to generate power for different low power stand-alone electronic devices. Dielectric Elastomer Generator (DEG) is a special variable capacitor generator which, by virtue of its variable capacitance property, can convert vibrational mechanical energy to electrical energy. Hence the DEGs can be used as a means to harvest electrical energy from various environmental...
This paper proposes a transformer based self-starting boost converter for thermoelectric energy harvesting, which operates even when polarity inversion of thermoelectric generator (TEG) occurs. TEG is used to convert thermal energy into electrical energy. Due to the Seebeck effect, an open circuit voltage of the TEG is proportional to the number of thermocouples in series and to the temperature difference...
Microbial fuel cell (MFC) is a device which can convert chemical energy into electrical energy directly, it has great utilization potentiality in the field of environmental monitoring and new energy development. The change of current is used to characterize the change of pollutant concentration. The power density of MFCs is so low and unstable that energyharvesting circuits are needed for real world...
In this paper, different energy harvesting solutions for an autonomous miniature wireless sensing node are invista-gated. The communication part is realized with Low Power Wide Area Network (LP-WAN) LoRa technology that combine low-power and long range capabilities. Solar, Thermal and Piezo harvesting techniques are compared for autonomous sensing application.
Electromagnetic energy harvesting holds a promising future for powering up low power electronic devices in wireless technology circuits. This paper presents an RF energy harvesting system that can harvest energy from the ambient surroundings at the downlink radio frequency range of 700MHz, 850MHz, 900MHz, 1800MHz and 2100MHz band. The harvesting system aimed to provide a new generation and alternative...
The system which logs measurements of environmental parameters or states of the object structural/constructional elements is discussed. The system demonstrates an autonomous work time of more than one year and provides the reading of accumulated data using radio frequency identification technology. The design of a device for energy harvesting from the power line electric field providing autonomous...
Literature has shown that the interface circuit plays an important role in a piezoelectric energy harvesting (PEH) system. By referring to the general model of synchronized multiple bias-flip (SMBF) and the recent implementation of parallel synchronized triple bias-flip (P-S3BF), this paper introduces a new implementation called parallel synchronized septuple bias-flip (P-S7BF) for further enhancing...
In this paper, a single-input dual-output rectifier for piezoelectric energy harvesting is proposed. An energy harvester often needs to feed multiple devices. The proposed rectifier provides dual outputs and the number of circuit components in the current path is reduced compared with conventional circuits. Furthermore, with this rectifier, the internal capacitance of the piezoelectric element is...
This paper presents an RF rectifier circuit for electromagnetic energy harvesting system. The double voltage rectifier together with the super capacitor are employed to harvest the electromagnetic energy. The proposed circuit is designed to operate at 5.8 GHz Wi-Fi frequency band. The Schottky diode SMS7630-061 is used to implement the proposed rectifier circuit. The super capacitor 5 V with capacity...
This paper presents a hybrid-powered wireless sensor node using enhanced triboelectric nanogenerator (TENG) as both energy harvester and air-flow sensor and two 11 cm2 solar panels as extra power supply. A low budget commercial RF microcontroller is included for data conversion, signal processing and wireless transmission. The method of flow-rate detection depends on the vibration frequency of the...
We have proposed a Beat Sensor concept as a persistent and energy-harvesting wireless sensing scheme. This paper describes a low-power enhanced Temperature Beat Sensor, which exhibits an operating current of 18 μΑ at 3 V, data accuracy within 0.04 °C at the size of a body less than 5 cm3. We propose an algorithm, that recovers data from common communication failures, resulting in longer communication...
Thermal energy harvesting systems use boost converters for high-efficiency low voltage operation, but lack the ability for low voltage startup without off-chip transformers. We present a cold start system that uses integrated magnetics instead of external transformers in a Meissner Oscillator to start up from ultra low voltages, with a switched capacitor DC-DC circuit for additional voltage gain....
Piezo-electric harvesting systems have proved to be a promising alternative to batteries for supplying portable devices. Recent trends focus on the reduction of the size of piezo-electric transducers through the development of nanostructured materials which exhibit output power levels in the order of few microwatts as well as maximum open voltage sources lower than 2 V. In this paper, we propose a...
Piezoelectric harvesters have been subject to a growing interest in recent years as they can provide a clean source of energy. To extract the power from the harvester, power conditioning circuits are required. In this article, a circuit is proposed to meet the requirements of relatively high efficiency, low voltage operation, good load regulation and sufficient DC output voltage. A combined cross-coupled...
This paper investigates a class of electrical generators based on capacitors and diodes, with two capacitors being variable. Their main characteristics are a symmetrical structure and that they produce two outputs with the same polarity. The simplest version is analyzed in more detail, although in an approximate way, and generalizations of it are obtained, identified with a particular form of two-phase...
To increase power conversion efficiency (PCE), we introduce a new rectifier, which combines advantages of cross-coupled and cross-coupled bridge rectifiers by switching between the two topologies according to the incoming signal power level. In conventional designs, cross-coupled topology attains up to 80% PCE in the low-power range, while cross-coupled bridge topology attains up to 80% in the mid-power...
An ultra-low power autonomous MPPT algorithm that maximizes the efficiency of a monolithic 0.98 mm2 solar harvester is presented. Using only the pn-junctions of the standard 130 nm single n-well process, the monolithic harvester can serve as supply for wireless sensor grains. Based on the perturbation and observation method, the MPPT algorithm maximizes the output current of the integrated charge...
RF energy harvesting holds a promisinge future for generating a small amount of electrical power to drive partial circuits in wirelessly communicating electronics devices. This paper presents an energy harvesting system based on LTC3108, which can effectively collect the surrounding WiFi energy. Two rectifier circuit, the Villard cascade circuit and the Greinacher circuit, were analyzed. In this paper,...
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