| 摘要 |
A solar power charging device with a self-protection function is provided, which includes a solar cell, a rechargeable battery, and a diode. The solar cell defines an open-circuit voltage Voc and an operating voltage Vop, in which the Voc is slightly higher than the Vop. The rechargeable battery defines a battery voltage, an operating voltage of load Vload, and a maximum charging voltage Vf, in which the Vf is substantially equal to the Voc. The diode has an anode connected to the solar cell and a cathode connected to the rechargeable battery. When the battery voltage of the rechargeable battery is lower than the Vop, the solar cell provides the rechargeable battery a fully-efficient charging current. When the battery voltage is raised to be equal to the Voc, the solar cell provides the rechargeable battery a charging current of zero, thus preventing the rechargeable battery from being overcharged.
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