This system to STC12C5204AD microcontroller as the core, use IRF9540 field effect switch tube realize PWM pulse width modulation produce available software control charging power supply, in order to adapt to the different stages of the charging requirements. Temperature sensor, the temperature of the battery monitoring, and through the A/D conversion and the real-time data acquisition, to charge the battery voltage process of intelligent control, to determine which stage, and finally reach the battery charge time to use the shortest, battery the purpose of the best effect. This design also has LED to show charge voltage, the CD4511 state function to display control. Can also through a serial port and the upper machine microcontroller and computer communication, realize to use PC to microcontroller program updates and download. Key words: STC12C5204AD PWM constant voltage intelligent charging
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