Large-power MBUS main controller circuit

Abstract

The invention provides a large-power MBUS main controller circuit which comprises a host computer sending circuit and a host computer receiving circuit; the host computer sending circuit comprises a direct-current power supply and a sending control circuit; the host computer receiving circuit comprises a sampling resistor, a pre-stage filter differential amplifier circuit and a signal output circuit; the pre-stage filter differential amplifier circuit comprises a pre-stage filter circuit and a differential amplifier circuit; the differential amplifier circuit comprises a computing amplifier; the pre-stage filter circuit comprises a first filter circuit and a second filter circuit; and the first filter circuit and the second filter circuit are output to the computing amplifier respectivelyand provide voltage output differential amplification signals through the computing amplifier. By adopting the large-power MBUS main controller circuit provided by the invention, the circuit design isconcise, the low-resistance value sampling resistor and the high-precision differential amplifier circuit are adopted to inhibit interference of a common mode signal and improve the stability of receiving the signal, and the slave node loading amount is increased.

Description

technical field [0001] The invention belongs to the technical field of control circuits, and in particular relates to a high-power MBUS main controller circuit. Background technique [0002] MBUS is a bus protocol specially designed for remote data transmission of heat meters. It is an important technology for the digitization of data transmission of measuring instruments. It has been widely used in passive contacts such as water, electricity, gas, heat meters and other data collection occasions. , the current existing MBUS host, the remote power supply of the host bus has low load capacity, poor driving load capacity, and poor adaptability of on-site products, which makes on-site maintenance and installation very difficult. At the same time, the existing MBUS host circuit has multiple loads. The sampling resistor in the receiving part of the host is hot and hot. Long-term heating and hot state can easily cause the resistor to burn out, reduce the service life of the resisto...

AI Technical Summary

Problems solved by technology

[0002] MBUS is a bus protocol specially designed for remote data transmission of heat meters. It is an important technology for the digitization of data transmission of measuring instruments. It has been widely used in passive contacts such as water, electricity, gas, heat meters and other data collection occasions. , the current existing MBUS host, the remote power supply of the host bus has low load capacity, poor driving load capacity, and poor adaptability of on-site products, which makes on-site maintenance and installation very difficult. At the same time, the existing MBUS host circuit has multiple loads. The sampling resistor in the receiving part of the host is hot and hot, and the long-term heating and hot state can easily cause the resistor to burn out, reduce the service life of the resistor, and reduce the communication performance and product stability.

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