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This paper describes and demonstrates an LED lighting system with an integral capacitive sensor that can detect occupancy both lighted and in the dark, and a driver (“ballast”) that is dimmable over a wide range. Sensing in the dark is accomplished by taking advantage of the logarithmic relationship between LED voltage and current. The ballast uses an inductor pre-charge technique to maintain efficiency...
Switched capacitor multilevel output DC-DC converters are evaluated as panel integrated modules in a solar maximum power point tracking system. The recommended system includes a central input current-controlled ripple port inverter. Potential benefits include per panel MPPT without inter-panel communication, electrolytic capacitors or per panel magnetics. Statistical methods are used to predict average...
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