Solar power panel circuit diagram

　　The circuit of the solar powered panel is shown in the figure below.

　　The solar charging circuit of the system is composed of D1 and BT. Usually, as long as a certain light intensity is reached, the solar panel charges the rechargeable battery BT through the diode D1 until it is saturated. In addition to the solar charging method, I also designed a backup external DC power charging interface in case of emergency. The external charging circuit consists of R1, DS1, D2, and BT. R1 uses a resistor with a power of 1W. When R1 is 10 ohms, the optimal external charging voltage is 3-4 volts. DS1 is an external charging indicator light , which is used The voltage drop across resistor R1 lights up. The subsequent boost circuit uses the fast turn-off (cut-off) characteristics of the intermittent oscillator to achieve boost. S1 is the power supply switch. When S1 is closed, the boost circuit starts to work, and the solar power supply panel can drive the load. J1 is the output interface, and DS2 is the output indicator light . The circuit of the solar power panel is shown in Figure 1. The solar charging circuit of the system is composed of D1 and BT.