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Efficient maximum power point tracking (MPPT) is an important problem for renewable power generation from photovoltaic systems. In this work, a current sensor based MPPT algorithm using an adaptive step-size for a single ended primary inductance converter (SEPIC) based solar photovoltaic system is proposed. Due to lower sensitivity of power to current perturbation as compared to the voltage one, such a scheme is shown to yield better efficiency at steady-state. A new adaptation scheme is also proposed for faster convergence of the MPPT technique. Hence, the proposed scheme yields better transient as well as steady-state performance. A prototype converter is used along with digital implementation of the proposed MPPT technique to demonstrate the superiority of the proposed algorithm over the fixed step-size and voltage based ones. Simulation and experimental results corroborates the same. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

This article explains finding of power issues and the methodology of giving a suitable solution for performance stabilization of an ultra-wideband very high gain receiver with steep gain gradient.  The origin of this problem lies in homodyning down conversion technique itself. Its LO is derived from input RF source. Varieties of frequency band limited equalizers like RC, RL and RLC are examined to overcome initial gain fluctuations at low frequencies as well as region based gain humps to reduce slope gradient. Thereby at the same time it helps to enhance practically achievable gain against theoretical gain at around highest frequencies by reducing power distribution among all harmonic and spurious components caused by lower frequency elements.

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