Solar lawn lamp charge and discharge controller design

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The charge controller as the interface circuit of the photovoltaic cells and lead-acid batteries are generally allowed to work at maximum power point, to achieve greater efficiency, but to achieve maximum power point tracking (MPPT) at the same time, also need to consider the battery The charge control. Commonly used in the main circuit topology of the buck circuit (Buck) converter, step-up circuit (Boost) converter, Cukor circuit (of Cuk) converter. General photovoltaic cell output voltage fluctuations, while Buck Converter or Boost converter can buck or boost transformation, affected, photovoltaic cells can not completely work in a wide range of maximum power point, resulting in system reduced efficiency. The same time, Buck converter input current ripple is large, if the input does not add an energy storage capacitor will make the system work in the intermittent state, resulting in a photovoltaic cell output current intermittent, and can not be in top working condition ; Boost converter output current ripple is large, this current battery charge, is not conducive to the life of the battery; of Cuk converter at the same time boost and buck, charge control Cuk converter used in PV syst ems device, in a wide range to achieve maximum power point tracking, the system efficiency. Therefore, often used in the Cuk converter as the main circuit of the charge controller.