Tractor lighting charger circuit

Single chip microcomputer STM32L151CCU6

Photocoupler

As shown in the figure, the illumination conversion circuit is based on 555 and constitutes an RS flip-flop circuit. When the flywheel generator does not turn, the relay J does not operate, and the illumination bulb H is powered by the battery; when the generator is rotated, the rectified voltage V acts as the power source of the 555 and the relay, and when the voltage on the C3 is rushed to the 2/3V trigger At the level, 555 is set, 3 feet output low level, J is pulled in, and the bulb is powered by the generator. At the same time, charge the battery. When the generator stops or the speed is too low, the 2 pin (S terminal) potential is lower than 1/3V, 555 resets, 3 feet are low level, J is released, often the contacts d, e and b, c are connected. . The lighting power is supplied by the battery. The potentiometers RP1 and RP2 are adjusted, but the upper limit voltage and the lower limit voltage are 5.8 V and 5.5 V, respectively.