Abstract:

The paper presents a kind of intelligent power management system used in engineering seismograph, which has features such as wide input range, stable output, self protection, simple user interface and low power consumption etc. The design of hardware in the system consists of power supply circuit based on power module, circuit based on high speed SCM C8051F320 and 24-digits high precision ANALOG-TO-DIGITAL CONVERTER LTC2449，the LCD screen backlight power supply circuit. The design of software in the system consists of the C language program for SCM and VC user interface program based on Embed Windows XP. It eventually accomplishes a kind of intelligent power management system for engineering seismograph with stable power supplyment, real-time current detection and adjustment of screen back light.

Key words: engineering seismic instrument, power management, LCD screen backlight, VC++ program