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A digital phase-locked loop (DPLL) is designed using 0.18 mm CMOS process and a 3.3 V power supply. It operates in the frequency range 200 MHz-1 GHz. The DPLL operation includes two stages: (i) a novel coarse-tuning stage based on a flash algorithm, and (ii) a fine-tuning stage similar to conventional DPLLs. The flash portion of the DPLL is made up of frequency comparators, an encoder and a decoder...
This paper proposes a novel maximum power point tracking (MPPT) control algorithm considering radiation to improve efficiency of PV system. The proposed algorithm is composed perturb and observe (PO) method and constant voltage (CV) method. PO method is simple to realize and CV method is possible to tracking MPP with low radiation. Response characteristics of proposed algorithm are compared to conventional...
The paper presents realization and control of a two-phase bi-directional interleaved converter for a photovoltaic (PV) system. Harmonic contents due to switching action in a dc-dc converter are reduced by the interleaving technique. A nonlinear function is used for predicting the maximum power point (MPP). A novel multi-loop control scheme is developed to achieve maximum PV power generation under...
Photovoltaic cell is a kind of DC current power with non-linear characteristic, and its output power varies with module temperature, solar isolation and loads. With the disadvantage of high cost, low transfer efficiency, it's necessary to track the MPP of the PV array all the time in order to improve the system efficiency. According to the mechanism and control adaptive MPPT method based on fuzzy...
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