Improving the Efficiency of PV Low-power Processing Circuits by Selecting an Optimal Inductor Current of the DC/DC Converter

Reverter, Ferran; Gasulla, Manel

doi:10.1016/j.proeng.2014.11.386

Cited by 4 publications

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References 5 publications

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“…A dc voltage source (with a resistor in parallel [12]) emulated a rechargeable battery. The output voltage (Vout in Figure 1a) was set to 3 V for PV-1, and 2.4 V for PV-2, thus emulating different states of charge of two cylindrical NiMH secondary batteries in series.…”

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confidence: 99%

Buck Converter for Low-Power PV Modules: A Comparative Study

Reverter

Gasulla

2018

Eurosensors 2018

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Autonomous sensors that harvest energy from the environment usually employ a dc/dc converter to regulate the operating voltage of the energy transducer around its maximum power point (MPP). In this context, this work evaluates the efficiency of a buck converter when regulating the operating point of two low-power photovoltaic (PV) modules subjected to different irradiance levels. The buck converter operates in burst mode (BM) and is able to transfer the energy from the PV module to a storage unit through an optimal value of the inductor current. Experimental results show that an irradiance increase can cause either an increase or a decrease of the converter efficiency. This is because the higher the irradiance, the higher both the MPP voltage and current of the PV module, which involve opposite effects in terms of the converter efficiency.

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mentioning

confidence: 99%

Buck Converter for Low-Power PV Modules: A Comparative Study

Reverter

Gasulla

2018

Eurosensors 2018

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Design and implementation of full bridge DC-DC converter for photovoltaic application

Chavan

Chavan²

2015

2015 International Conference on Energy Systems and Applications

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Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

2018

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In autonomous sensor nodes, switching dc/dc converters are usually employed to power the sensor electronics and also to maintain the operating voltage of an energy transducer around its maximum power point. In such a context, this paper optimizes the power efficiency of buck dc/dc converters when operating in burst mode, which is preferable than the conventional pulse-width modulation technique in lowpower sensor applications. The optimization is carried out by selecting an optimal inductor current to efficiently transfer the energy from the input to the output during the burst. Such optimization is applied when regulating the converter's output voltage, which corresponds to the supply voltage of the sensor electronics, and also the input voltage, which corresponds to the operating voltage of the energy transducer that is here a photovoltaic module. The theoretical analysis and the experimental results reported herein prove the existence of such an optimal inductor current in both scenarios. Experimental tests with a commercial buck dc/dc converter (TPS62750) show that the use of this optimal inductor current provides up to 9% increase in efficiency, thus prolonging the operating lifetime of the sensor node.

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Improving the Efficiency of PV Low-power Processing Circuits by Selecting an Optimal Inductor Current of the DC/DC Converter

Cited by 4 publications

References 5 publications

Buck Converter for Low-Power PV Modules: A Comparative Study

Buck Converter for Low-Power PV Modules: A Comparative Study

Design and implementation of full bridge DC-DC converter for photovoltaic application

Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

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