The energy utilization efficiency of PV panel can be significantly affected by the partial shadow effect. Traditional solutions mainly focus on panel-level optimization but ignore the partial shadow happens on sub-string level which may also affect the efficiency. In this paper, a novel solar panel power optimizer with selfcompensation for partial shadow condition is proposed. The optimizer can realize self-compensation for the unbalanced part inside the PV panel without changing the electrical connection. At the same time, the optimizer, which is implemented by simple multi-winding flyback topology, draws the compensation current from the output of the same panel, so that no other source is required for compensation. The simulation and experimental results show that the output power of the PV panel under partial shadow condition is significantly increased by applying the proposed circuit.

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We report an ingenious method of super-resolution optical microscopy utilizing scannable cantilever-combined microsphere. By scanning the microsphere over the sample surface in a cantilever-combined microsphere-sample contact state, super-resolution images can be acquired at arbitrary sample regions through near-field information collection by the microsphere. In addition, such a state can effectively reduce the possibility of breaking the cantilever and damaging the microsphere or sample surface. This work has developed a new method and technique of sub-diffraction-limit optical microscopy, and can be practically applied in various fields of micro/nanoscopy.

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