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Dynamic threshold comparison circuit applied to M-BUS interface communication

A M-BUS, interface communication technology, applied in the direction of electrical digital data processing, instruments, etc., to achieve the effect of simple structure and eliminating the influence of impedance

Active Publication Date: 2015-06-24
南京国博电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the communication accuracy problem caused by the impedance of the bus cable in M-BUS and other interface communication chips, and provides a dynamic threshold value comparison circuit, which changes the original method of measuring the bus level value to detect the change of the bus voltage, thereby eliminating Effect of Cable Impedance

Method used

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  • Dynamic threshold comparison circuit applied to M-BUS interface communication
  • Dynamic threshold comparison circuit applied to M-BUS interface communication
  • Dynamic threshold comparison circuit applied to M-BUS interface communication

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Embodiment Construction

[0017] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0018] Such as figure 2 As shown, the receiver in the interface chip inputs two voltage signals, the bus voltage differential value VB and the dynamic voltage VSC, which are sent to the comparator TC3 and output TTL level. The input signal of the comparator, one side is the dynamic voltage VSC formed by lowering a threshold voltage from the highest level of VB and regulated by the SC capacitor, and the other side is the VB voltage. The receiver threshold voltage is the quiescent voltage difference between the op amp's two inputs. When the bus voltage VB is greater than the dynamic voltage, TX will reverse accordingly.

[0019] Therefore, the core idea of ​​the present invention is to use the voltage stabilizing characteristics of the capacitor to design the magnitude of the current during charging and discharging so that there is always a...

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Abstract

The invention discloses a dynamic threshold comparison circuit applied to M-BUS interface communication. The steady voltage characteristic of a capacitor is utilized, by designing the current magnitude in the process of charging and discharging, a steady difference value is enabled to be kept between a dynamic voltage and the highest bus level, when a bus voltage value is comparatively small due to impedance loss, the dynamic voltage varies with a bus voltage correspondingly, and an overturning threshold value of a comparator is no longer a fixed quantity, so that the impact of cable impedance on the communication precision is eliminated.

Description

technical field [0001] The invention relates to a dynamic threshold value comparison circuit, which is suitable for interface communication chips such as M-BUS, can improve the accuracy of reading bus terminal control signals, and belongs to the public utility meter direct reading technology. Background technique [0002] M-BUS was jointly proposed by Paderborn University and TI company, and its full name is Meter-BUS, which can be translated as instrument bus. It is a European standard for reading data from remote meters. The introduction of M-Bus meets the needs of networking and remote meter reading of public utility meters, and it can also meet the special requirements of remote power supply or battery power supply systems. [0003] M-BUS is a hierarchical system consisting of a master device, several slave devices and a pair of connecting cables. All slave devices are connected to the bus in parallel, and the master device controls all serial communication processes on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40
Inventor 徐义强施家鹏曾红霞
Owner 南京国博电子股份有限公司