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SPV1001T40 Datasheet(PDF) 4 Page - STMicroelectronics |
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SPV1001T40 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 12 page Device description SPV1001 4/12 Doc ID 18076 Rev 3 3 Device description A photovoltaic panel consists of a series of PV cells. In optimal conditions, all the cells are equally irradiated and function at the same current level. However, during normal operation some cells may become partially shaded or obscured. These shaded cells limit the current generated by the fully irradiated cells and, in the extreme cases where these cells are totally obscured, the current flow is blocked. In this case the shaded cells behave like a load, and the current generated from the fully irradiated cells produces overvoltages which can reach the breakdown threshold. This phenomenon, known as a “hot spot”, can cause overheating of the shaded cells and, in some cases, even permanent damage resulting in current leakage. To prevent hot spots, therefore, bypass diodes are connected in parallel to the cell strings. The device described here has the same functionality as a Schottky diode, but with improved performance. It features very low forward voltage drop and reverse leakage current. It consists of a power MOSFET transistor which charges a capacitor during the OFF time, and drives its gate during the ON time using the charge previously stored in the capacitor. The ON and OFF times are set to reduce the average voltage drop across the drain and source terminals, resulting in reduced power dissipation. |
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