Multi-current threshold MBUS transceiver circuit and adaptive current threshold acquisition algorithm

Through the multi-current threshold MBUS transceiver circuit and the adaptive current threshold acquisition algorithm, the problems of insufficient sensitivity and high misjudgment rate of traditional M-Bus receiving circuits are solved, and adaptive processing and rapid response to signals of different amplitudes are realized, which improves the reliability of communication and anti-interference ability.

CN120455201APending Publication Date: 2025-08-08LUOYANG VISION SCI & TECH
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Patent Information

Application Number
CN202510822689.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-19
Publication Date
2025-08-08

AI Technical Summary

Technical Problem

The traditional M-Bus receiving circuit adopts a fixed comparison threshold method, which is difficult to adapt to bus current signals of different amplitudes, resulting in insufficient sensitivity or high misjudgment rate, and lack of flexibility in the design of the response switch circuit, which affects the reliability and response speed of communication.

Method used

Multi-current threshold MBUS transceiver circuit is adopted, including current sampling module, signal amplification module, comparator module, voltage regulation module and control execution module. The reference voltage is dynamically adjusted by the programmable I/O expansion chip, combined with the adaptive current threshold acquisition algorithm, adaptive processing and fast response to signals of different amplitude values are achieved.

Benefits of technology

It improves the sensitivity and compatibility of M-Bus communication, reduces the bit error rate, enhances the stability and anti-interference ability of the system, and ensures reliable communication in complex environments.

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Abstract

The invention discloses a multi-current threshold MBUS transceiver circuit and a self-adaptive current threshold acquisition algorithm. The circuit mainly comprises a signal sampling module, a signal amplification module, a comparison and judgment module, a voltage division control module, a control execution module and a protection and filtering module. After a code return current signal is converted into voltage through the sampling resistor, the voltage is primarily amplified through the operational amplifier and then input into the comparator for high and low level judgment, the reference voltage of the comparator is determined by the adjustable voltage dividing network, and the voltage dividing network controls the series-parallel connection mode of different resistors through the I / O expander to achieve dynamic adjustment of the reference voltage. The designed adaptive acquisition algorithm can preferentially select a proper threshold value according to a historical copy record, and automatically polls a plurality of threshold values until successful identification when no record exists, thereby effectively improving the accuracy of return code identification and the reliability of system communication. The technology has the advantages of being high in signal adaptability, good in anti-interference capability, suitable for various load environments and the like, and is suitable for being widely applied to intelligent meter reading M-Bus communication scenes.
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