ABSTRACT
With modern sensor technology, electronics technology and the rapid development of computer technology, high-precision, high-quality, low-power, multi-purpose equipment weighing more and more rapid, accurate, continuous, automated electronic balance has become the most popular The balance of scales. [1] In order to achieve the high-precision electronic balance, high-quality, low-power characteristics, such as using the SCM control system[2]. This paper describes the electronic balance of the entire system by the board DC-DC converters to achieve full DC Circuit 3.3 V, +10 V, +5 V,-12V power supply; AD conversion chips used Mettler-Toledo's own research and development of ASIC MELSI2, can quickly , High-precision acquisition sensor circuit board signal; microcontroller used PHILIPS company LPC2138, carrying RTC, and with a rechargeable battery and charging circuit, with keys that within the school and motor drive circuit, with Weighing fast, reliable accuracy, automated calibration, peeled weight, and other functions, to achieve a balance of the electronic, digital, intelligent, and supported by different interface, and printers, computers and other external devices.
Key words: electronic balance; SCM; DC-DC converters DC; AD conversion
