Research on one kind of Intellectualization High Accuracy Digital Adjustmen Direct Source

摘要

The power source uses the digital adjustment, the closed loop real-time monitoring. The output precision is vary high. It also has both the dual over-load protection and alarm, which is suitable especially in each kind situation of the high accuracy request. This design intellectualization direct-current power supply uses the self-restraint keyboard entry. The system of intellectualization high accuracy digital adjustmen direct source contains D/A module and A/D module. D/A module adopts low-priced 8 bits DA chip. DAC0832 is a electric current exports type 8 bits D/A converter, adopting to reversing T type resistor network. The ADC0809 chip, with 8 bits AD changes, accomplishes the data collect function and makes up into the closed cycle circuit. The inside of ADC0809 has output lock-memory implement, it can link up with AT89C51 monolithic machine directly. The stabilivolt outputed and over-stream protection module adopts the in-line stabilivolt circuit which has used three end integrated stabilivolt chip, adopting LM317 and LM337 series three hold adjustable stabilivolt tube., LM317 is a three end adjustable voltage stabilizer integrated circuit of USA country semiconductor company. The single-chip microcomputer receives voltage value information of keyboard input, and carries on processing.