一种简化型M-BUS通信芯片设计

Design of Simplified Meter-Bus Transceiver

这是简化型M-BUS通信芯片的设计思路,旨在为解决国网公司提出的"四表(水表、燃气表、热量表、电表)集抄"战略中水表、燃气表以及热量表上M-BUS通信芯片上低成本、针对性的方案。芯片可以适应从站与主站之间的电势差,总线连接没有极性要求,芯片可由主站通过总线供电,无需在从站中对芯片进行单独供电。芯片在接收时,内置动态电平识别电路,芯片发送时,可为总线提供最高可达50 m A可调节发送电流。

Aiming at the low-cost centralized meter reading system of State Grid Corporation, which focused on the intelligent water meter, gas meter, heat meter and electricity meter, this paper presents a simplified design of M-BUS Transceiver. The circuit adjusts the different potentials between a slave system and the Meter- Bus. The connection to the bus is polarity independent. It is supplied by the master via the bus. Therefore, this circuit offers no additional load for the slave battery. The receiver has dynamic level recognition, and it can provide 50mA adjustable current during transmission.