A method to eliminate the interference of switching power supply of mbus water meter

Abstract

The invention discloses a method for eliminating the interference of switching power supply of MBUS water meter. The power supply system of MBUS water meter is composed of two schemes of LDO and DC-DC switching power supply. LDO independently supplies power to other modules except the valve control circuit, and DC-DC independently supplies power to Power supply for the valve control circuit; when the valve control action is not required, the MCU controls to turn off the DC‑DC switching power supply, the load regulation switch is turned off, and the input switch is turned off; when the valve control is required, the MCU turns on the input switch and enables the DC‑DC switch The power chip is working and the load regulation switch is turned on. The invention eliminates the interference of the DC-DC switching power supply on the MBUS water meter using the DC-DC switching power supply scheme to the MBUS communication, improves the power supply efficiency of the MBUS water meter, reduces the power consumption during the valve control action, and reduces the meter reading. The load burden of the equipment enhances the mounting capacity of the main equipment for meter reading.

Description

technical field [0001] The invention relates to the technical field of MBUS wired water meter communication, in particular to a method for eliminating the interference of MBUS water meter switching power supply. Background technique [0002] With the continuous promotion of smart water services, the demand for smart water meters is increasing. MBUS wired remote water meters are used more and more widely as a smart water meter. Generally speaking, its communication stability is high, and it is easy to achieve real-time water data. Reading, and the MBUS wired water meter can obtain power through the MBUS bus, reducing the dependence on the battery and significantly extending the life of the smart water meter. [0003] The power consumption of a single MBUS water meter obviously affects the number of mounted reading devices. In order to improve the power efficiency of wired water meters and meet the demand for high current driven by the valves of water meters with valves, many ...

AI Technical Summary

Problems solved by technology

[0003] The power consumption of a single MBUS water meter obviously affects the number of mounted reading devices. In order to improve the power efficiency of wired water meters and meet the demand for high current driven by the valves of water meters with valves, many MBUS water meters with valves use DC-DC The power supply scheme provides valve drive, and the MBUS bus is both a power supply line and a communication line, so if the switching signal of the DC-DC power supply scheme is not properly handled, it will affect the communication stability of the MBUS

[0004] The existing methods to reduce the impact of switching signals on communication stability mainly include filtering on the acquisition device side and adding capacitance to the MBUS bus. Eliminate bus interference from switching power supplies

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