Intelligent M-BUS host circuit with photoelectric isolation function and control method

Abstract

The invention belongs to the technical field of communication, and discloses an intelligent MBUS host circuit with a photoelectric isolation function and a control method, a host sending circuit is powered by a lithium battery, and bus data sending is realized by adjusting the output level of a boost DCDC; the host receiving circuit dynamically adjusts the host receiving characteristics by using aPWM modulation circuit so as to adapt to the electrical characteristics of different types of slaves; the rear end adopts an operational amplifier comparator mode and is used for receiving and demodulating slave signals; a bus state acquisition circuit converts bus current into a voltage signal through the sampling resistor, and the signal is converted into a pulse signal through the voltage-frequency conversion circuit and transmitted to the main control unit through the signal isolation circuit. According to the circuit, the problem of poor dynamic response when the number of slaves of theexisting MBUS host circuit is small can be effectively solved, and meanwhile, the MBUS receiving characteristics are intelligently and dynamically adjusted to adapt to pulse current of various types of slaves on site.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an intelligent M-BUS host circuit and a control method with photoelectric isolation function. Background technique [0002] At present, in order to promote the development of the country's "smart city", it has become a key task to use the existing channel resources to build a four-meter automatic collection application system for "water, electricity, gas, and heat". M-BUS is a master-slave semi-dual Industrial communication system, with the advantages of low cost, convenient power supply, non-polarity, and long transmission distance, it is widely used in the reading of water meters, gas meters, and heat meters. [0003] The existing M-BUS host transceiver control circuit mainly adopts 36V or 12V power supply, and generally requires AC power supply to realize it. Meter installations in existing buildings are located far away from the building and scattered. More...

AI Technical Summary

Problems solved by technology

[0005] (1) The traditional M-BUS master circuit cannot perceive parameters such as the number and status of slaves, and cannot meet the increasingly intelligent meter reading needs

[0006] (2) The differences in the electrical characteristics of traditional M-BUS slaves lead to the inability of existing circuits to meet the requirements of slave diversity

[0007] The difficulty of solving the above problems and defects is: the existing M-BUS master circuit is designed according to the electrical characteristics of standard slaves, but there are a large number of non-standard slaves on the market, resulting in communication failure

And cannot quantify the M-BUS bus current

The current M-BUS host transmission circuit is divided into two types, one uses dual power supplies to adjust the bus level, but its cost is high, the structure is complex, the reliability is poor, and its application is less; the other uses a single power supply and uses LDO adjusts the bus voltage. Due to the characteristics of LDO, when the bus level changes from high to low, the dynamic response becomes worse, especially when the load is light, so it can only be solved by increasing the minimum load, which is not efficient, especially When powered by the battery, indirectly shorten the battery life

Images