Browsing by Author "Hsu, W. H."

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A FLEXIBLE, NON-INTRUSIVE POWER SENSOR TAG FOR THE ELECTRICITY MONITORING OF TWO-WIRE HOUSEHOLD APPLIANCES
(2012)
Chen, Y. C.
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Hsu, W. H.
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Cheng, S. H.
;
Cheng, Y. T.
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This paper presents a flexible non-intrusive power sensor tag with good proximity for accurate electric current and voltage sensing on a typical SPT-2 18AWG zip-cord power line of household appliances. The current and voltage sensors are simultaneously fabricated on a 100 mu m-thick flexible PET substrate. For the design of a 50-turns coil combing with two sensing electrodes in an area of 1.3x1cm(2), the sensor tag exhibits a sensitivity of 31.1 mu V/A and 98.9mV/115V for detecting 60Hz electric current and voltage, respectively.
Efficiency and Droop Improvement in GaN-Based High-Voltage Light-Emitting Diodes
(2011-08-01)
Wang, C. H.
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Lin, D. W.
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Lee, C. Y.
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Tsai, M. A.
;
Chen, G. L.
The efficiency and electrical characteristics of GaN-based high-voltage light-emitting diodes (HV-LEDs) are investigated in detail. The spatial distribution of light output and simulation results showed that 100-V HV-LED with smaller microchips had superior current spreading. As a result, under 1-W operation, the luminous efficiency of 100-V HV-LED with smaller microchips was enhanced by 7.8% compared to that of 50-V HV-LED, while the efficiency droop behaviors were reduced from 28% in 50-V HV-LED to 25.8% in 100-V HV-LED. Moreover, smaller microchips exhibited lower series resistance and forward voltage, leading to higher wall-plug efficiency.