Solar cell power supply circuit and portable multi-parameter water quality detector

The utility model discloses a solar cell power supply circuit and a portable multi-parameter water quality detector, and relates to the field of water quality detection, the circuit comprises a solar panel, two resistors, a triode, three diodes, a rechargeable battery, a voltage detector, a memory battery and a capacitor; the two resistors and the triode form a switching circuit, the circuit is switched off when the rechargeable battery is fully charged, and the circuit is switched on and continues to be charged when the voltage of the rechargeable battery drops; wherein the two diodes can prevent current backflow of the rechargeable battery when the solar panel has no output; when the input voltage of the second pin of the voltage detector exceeds 5.4 V, the first pin of the voltage detector outputs a control voltage to disconnect the triode and stop charging. The solar panel is adopted to collect solar energy resources for power supply, frequent battery replacement is not needed, and the working efficiency