In this paper, the performance of a 4x4 cm 2 Bismuth Telluride based thermoelectric generator with 126 thermocouples connected in series is analyzed experimentally under different environmental conditions. The hot junction of the thermoelectric generator is exposed to solar and candle heat and the cold side is exposed to atmosphere. With the hot junction temperature of 53 • C and cold junction temperature of 32 • C , the output voltage , current and power are measured as 0.35V,0.042A and 0.014W respectively. The hot junction of the thermoelectric generator is then exposed to solar concentrator heat and the cold side is exposed to ice. With the hot junction temperature of 100.2 • C and cold junction temperature of 2.9 • C, the output voltage, and power are measured as 2.96V, 0.1083A and 0.319W respectively. The power output is increased by 30.5%. The power density is 2.11μ Wcm -2 • C -2 .
This work presents the design, simulation and performance of Micro Thermoelectric Generator (micro TEG) for power generation from solar heat. For analysis we used P and N silicon Thermo elements and Copper as the interconnect between the two legs. The output voltage obtained per device is 10.55mV, for a temperature difference of 10K. By varying the thickness of the interconnect layer the output can be varied. The size of the each leg of thermocouples in this analysis is 50 μm by diameter and height 100μm and distance between two legs, 50 μm. This gives a power density of 0.145W.cm -2 K -2 . The power can be efficiently used for lighting an LED with a power rating of 72mW.
This paper presents a front-end ac-dc high power factor single stage topology. The proposed topology has good efficiency, better power factor and small size structure. The electronic ballast is designed with buck boost converter. The electronic ballast supplies power to fluorescent lamp. The lamp power regulation for the variations in the input voltage is assured. The steady state operation of the electronic ballast is done. The design of the converter in carried out from the basic principle. The equations for the electronic ballast circuit is derived from the basic principle and the analysis of the converter is done based on the equations. The elements used in the converter circuit is designed using the derived equations. The proposed converter circuit is developed for testing using 40W lamp and to determine the performance of the converter. The input pf measured has become more than 0.99. The electronic ballast efficiency with PFC circuit and buck boost converter is 94.46%
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