Intelligent Electronic Energy Meter Research And Development

Intelligent Instrument is the combination of the electronic measuring instrument and computer technology. Comparing with the traditional Instrument, Intelligent Instrument has the following features: higher measuring accurate, convenient measuring, stronger control ability, better human- machine interface, and communication function. With the development of micro-electronic, computer and network technology, the automation of Intelligent Instrument will still be advanced by a long way. In the next ten years, there is being a quantum jump in Intelligent Instrument technology. On the basis of these, an intelligent multi-function watt-hour-meter and an infrared portable copying instrument are designed and tested. The thesis has mostly the following content:(1). The development process and trend of Intelligent Instrument are discussed. It is also discussed that micro-electronic technology, computer technology, network technology and embedded computer technology are advancing the development of Intelligent Instrument.(2). The hardware designing method for Intelligent Instrument is analyzed according to the aspect of the input channel, the output channel, the human-machine interactive channel and the communication interface of Intelligent Instrument. The typical software structure and programming method are also discussed. The hardware and software anti-interference method were introduced as well as the hardware and software fault diagnose method.(3). The hardware circuit and software program of the electron watt-hour-meter are researched. A feasible structure scheme of the meter is put forward according to its desired function. In the designed hardware, AT89C51 single chip computer and many kinds of new type circuit chip (including: special power measuring chip-CS5460A, DS1302 calendar/clock chip, SMS0601 LCD, X5045 serial memory) are used for design. The hardware circuit is simplified, the meter's anti-interference ability is enhanced and the precision of measurement is also advanced. (4). The hardware circuit and software of the portable copying instrument isresearched. A feasible structure scheme is put forward according to the desired function, AT89C51 single chip computer is used as the core of the instrument, zlg7289A and many kinds of new type circuit chip (including: parallel data memory-DS1245, SMS0823 LCD) are used as interface during hardware circuit designing, the printer's port and RS232 communication interface is also designed.(5). An infrared transmission system used to serial communication is also designed. It can interface with single chip computer expediently and transmit data by rule and line. Oscillator in the infrared transmitting circuit that consisted of NE555, and can used to modulates the output from serial port of single chip computer. The integrated infrared receiver can demodulates, filter and transmit the signal to single chip computer.