A project design of intelligent timing charging management instrument

Portable electric test instrument equipped with accumulator has used widely, but the accumulator is in existence of the problem of self-discharging in using process. According to the problem, the paper provides a project design that it can make the accumulator charged automatically. The design uses 51 single-chip microcomputer(SCM) as its kernel unit. Using phase locked loop technology and high speed multichannel AD transformation chip MAX125, it accomplishes to gather the synchronized charging voltage and charging current. It uses easy operational BCD dial to achieve the parameter input and 12864 graph lattice liquid-crystal display to provide Chinese menu. Using the design, it can make the charging process safe, unattended and automatic. The design has been tested in the actual application.