Software design of solar street light system

Design of solar street light system software (1) Control of PWM output. The single-chip microcomputer is used to control the PWM modulation signal output by the TLA94 chip. When the load changes or the protection state occurs, the single-chip microcomputer sends a signal (220VOFF) to turn off the TL494 output, cut off the inverter circuit input, and ensure that the inverter output voltage is zero. It is required that the software design should ensure that the single-chip microcomputer has been sampling the signal state of the output terminal. (2) Detection and control of battery voltage. The normal working value of the battery voltage is 12±1V. When the battery voltage is lower than 11V, the circuit is required to immediately stop the battery to supply power to the load output, otherwise the battery life will be affected. The battery voltage detection value is sampled, that is, the Batter_Adin signal in the circuit. Once it is found that the voltage is low, the single-chip microcomputer outputs a control signal (RY1) to switch the relay 1 in time, so that the power supply of the load bulb is changed from the battery to the mains. (3) Display and keyboard input functions. In this system, the display function is divided into two parts: one is the digital tube display, which is mainly used to display the working time of the system; the other is the LED display, the state change of the LED represents the working state of the circuit, and the green light represents the normal operation, A red light indicates a malfunction. The display function of the system is mainly realized by the single chip software. In addition, considering the need to set the mode of the circuit in the circuit, a keyboard input circuit is added, and there are three DIP switches in the controller to realize the three-way remote control output of the street lamp. Figure 7 is the main program flow of the controller