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A complete system for single solar-cell fully on-chip micro-scale energy harvesting is proposed. To maximize the extracted output power over the entire illumination range, optimal frequency operation and reconfigurable adaptive switch sizing techniques have been discussed. A fully digital illumination change detection block and a reconfigurable VCO/CCO (Voltage/Current Controlled Oscillator) scheme...
This paper presents, a complete energy harvesting system with improved implementation of Fractional Open Circuit Voltage (FOCV) technique, to mitigate obligation of using off chip sampling capacitor, gratuitous periodic open circuit operation for Maximum Power Point Extraction (MPP) from solar cell. A possible solution to minimize the reverse current in solar cell due to abrupt decline in irradiance...
Photovoltaic power generation technology is already quite mature. But the conversion efficiency of the silicon cells which are heavily used now remains stagnant. Besides, large amounts of energy will be consumed during the process of production. It also makes serious pollution. Thus, to maximize utilization of solar cells will undoubtedly have a huge problem about economic and environmental benefits...
This paper researches a lighting control system based on lighting emitting diodes (LEDs) as lighting source, solar energy as primary source and batteries as secondary source. Maximum power point tracker (MPPT) and the battery state (charged/discharged) are contained in this system. It presents a way to charge the batteries called uniform charging method and a new type high frequency impulse LED driving...
Owing to the complexity of the photovoltaic system structure and their environment, especially under the partial shadows environment, the output characteristics of photovoltaic arrays are greatly affected. Under the partial shadows environment, power-voltage (P-V) characteristics curve is of multi-peak. This makes that it is a difficult task to track the actual maximum power point. In addition, most...
With the daily worsening of global energy crisis and environmental pollution, characteristics of the non-pollution, non-noise and non-raw material except the sun of photovoltaic generation make it a promising green energy. This paper proposes a strategy of photovoltaic lighting system with energy management and control, which includes maximum power point tracking sub-battery charge control and battery...
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