scholarly journals A High-Efficiency Driver Circuit for a Gas-Sensor Microheater Based on a Switch-Mode DC-to-DC Converter

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5367
Author(s):  
Tzu-Sen Yang ◽  
Jin-Chern Chiou
Keyword(s):  
Power Consumption ◽  
Energy Conversion ◽  
Gas Sensor ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Power Converter ◽  
Wide Range ◽  
Switch Mode

Low power consumption is one of the critical factors for successful Internet of Things (IoT) applications. In such applications, gas sensors have become a main source of power consumption because energy conversion efficiency of the microheater is relative over a wide range of operating temperatures. To improve the energy-conversion efficiency of gas-sensor microheaters, this paper proposes integrated switch-mode DC-to-DC power converter technology which we compare with traditional driving methods such as pulse-width modulation and the linear mode. The results indicate that energy conversion efficiency with this proposed method remains over 90% from 150 °C to 400 °C when using a 3.0, 4.2 and 5.0 V power supply. Energy-conversion efficiency increases by 1–74% compared with results obtained using the traditional driving methods, and the sensing film still detects alcohol and toluene at 200 °C and 280 °C, respectively, with high energy conversion efficiency. These results show that the proposed method is useful and should be further developed to drive gas-sensor microheaters, and then integrated into the circuits of the complementary metal-oxide-semiconductor micro electro mechanical systems (CMOS-MEMS).

Direct-Write Piezoelectric Polymeric Nanogenerator with High Energy Conversion Efficiency

Nano Letters ◽  
2010 ◽  
Vol 10 (2) ◽  
pp. 726-731 ◽  
Author(s):  
Chieh Chang ◽  
Van H. Tran ◽  
Junbo Wang ◽  
Yiin-Kuen Fuh ◽  
Liwei Lin
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Direct Write ◽  
High Energy Conversion Efficiency

scholarly journals Exploring harnessing wind power in moving reference frames with application to vehicles

2019 ◽  
Vol 11 (9) ◽  
pp. 168781401986568
Author(s):  
Oleg Goushcha ◽  
Robert Felicissimo ◽  
Amir H Danesh-Yazdi ◽  
Yiannis Andreopoulos
Keyword(s):  
Energy Conversion ◽  
Wind Power ◽  
Conversion Efficiency ◽  
Reference Frames ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
High Mass ◽  
Specific Power ◽  
Moving Frames ◽  
Atmospheric Conditions

The possibility of extracting wind power from unique configurations embedded in moving vehicles using microturbine devices has been investigated. In such environments with moving frames or platforms, powered either by humans like bicycles or by chemical reactions like automobiles, the specific power of the air motion is much greater and less intermittent than in stationary wind turbines anchored to the ground in open atmospheric conditions. In a translational frame of reference, the rate of work done by the drag force acting on the wind harnessing device due to the relative motion of air should be taken into account in the overall performance evaluation through an energy balance. A device with a venting tube has been tested that connects a high-pressure stagnating flow region in the front of the vehicle with a low-pressure region at its rear. Our analysis identified two key areas to focus on for potentially significant rewards: (1) vehicles with high energy conversion efficiency, which require a high mass flow rate through the venting duct, and (2) vehicles with low energy conversion efficiency with wakes, which will be globally affected by the introduction of the venting duct device in a manner that reduces their drag so that there is a net gain in power generation.

Highly efficient n-type PbTe developed by advanced electronic structure engineering

2020 ◽  
Vol 8 (38) ◽  
pp. 13270-13285 ◽  
Author(s):  
Krzysztof T. Wojciechowski ◽  
Taras Parashchuk ◽  
Bartlomiej Wiendlocha ◽  
Oleksandr Cherniushok ◽  
Zinovi Dashevsky
Keyword(s):  
Electronic Structure ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Highly Efficient ◽  
High Energy Conversion Efficiency ◽  
Structure Engineering

Advanced electronic structure engineering was applied for obtaining a record-high energy conversion efficiency for n-type PbTe.

Hierarchical Ti1−xZrxO2−y nanocrystals with exposed high energy facets showing co-catalyst free solar light driven water splitting and improved light to energy conversion efficiency

2017 ◽  
Vol 5 (33) ◽  
pp. 17341-17351 ◽  
Author(s):  
Shreyasi Chattopadhyay ◽  
Swastik Mondal ◽  
Goutam De
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Single Crystals ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Co Catalyst ◽  
Solar Water Splitting ◽  
Catalyst Free

Ti1−xZrxO2−y single crystals with exposed high energy facets and defects show co-catalyst free solar water splitting and high solar energy conversion in DSSCs.

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