The Research And Design On A New Type Of Multi-user Electronic Energy Meter

In accordance with the present situation of the main electricity measurement problems existing in the field where many power user are living together, such as residential area or student's apartment, a kind of multi-user electronic energy meter has been designed in this article. This electronic energy meter can detect the active amount of electricity of many users. Besides its wide measuring range, high precision, and low power, it can measure different electricity for each user in different time section which will improve the running efficiency of the electric net by adjusting the unbalance station of power consumption. Based on this meter, the automatic meter reading system adopts the low voltage power line to carry data.At first, this paper summarizes the developing history and the present state of energy meter and automatic meter reading system, and introduces the basic theory of energy measurement. As an important part, the principle of 2 - A analog-to-digital conversion has been analyzed. Then, the circuits of this energy meter's hardware are illustrated in this paper, such as DC power supply, energy measurement circuit, extended memory circuit, real-time clock, extended display and keyboard circuit, and decoder circuit, etc. The receiving, transmitting and coupling circuits for power line carrier communication interface are designed by using the spread spectrum communication 1C of SSC16 series which are developed for China's electric net. On the software, the realization of the main program and the subprograms such as energy pulse acquisition, multi-rate measurement, max-power demand measurement, data dynamic display, and keyboard scanning, are introduced with some flow charts. As an emphasis, the automatic metering program and the main content of communication protocol. Finally, system's measurement error and error compensation method are analyzed, and some measures of anti-interference are taken to improve system's reliability.Generally, the study on this topic will improve the electric energy measurement and management to a high level, and it is worthy of generalization.