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A discrete non-standard MBUS communication method

A communication method and discrete technology, applied in the field of electric energy meters, can solve the problems of communication failure, the high level is not high enough, and the level drop of the communication line cannot be improved, and the communication effect is good.

Inactive Publication Date: 2019-04-16
NINGBO SANXING INTELLIGENT ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high temperature, the load capacity of the MBUS circuit declines, resulting in insufficient charging capacity for the energy storage capacitor. With the increase of communication time, the terminal voltage of the energy storage capacitor is bound to decrease all the time. Because of its characteristic that the terminal voltage cannot change suddenly, it will eventually cause the CIU to display When the module sends a high level, the high level on the MBUS communication line is not high enough, the circuit cannot recognize the high level, and the communication fails
[0004] Moreover, in terms of hardware, the guide rail table cannot improve the problem of communication line level drop. At the same time, the CIU display module has been mass-produced, and considering the small space and cost constraints of the structural parts of the CIU display module, by increasing the capacity of the energy storage capacitor It is also unrealistic to change the CIU display module

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  • A discrete non-standard MBUS communication method
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  • A discrete non-standard MBUS communication method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following specific embodiments.

[0026] Such as figure 1 As shown, it is the waveform diagram of MBUS communication before improvement. The data in the figure is the data when the CIU sends data. It can be seen that the level on the communication line shows a downward trend when the CIU sends data, which can be approximated as a diagonal line. The horizontal projection length of this oblique line is about 160ms, and the vertical projection length is 2V, so the slope can be calculated as -0.0125V / ms. For the amount of data of 1 byte and 10 bits, at 2400 baud rate, the duration is 10*416us=4.16ms, and the voltage on the communication line decreases by about 0.0125V / ms*4.16 per byte. ms=0.052V.

[0027] After each byte of data sent by CIU, there is a delay for a period of time, which is used for the...

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Abstract

The invention relates to the technical field of electric energy meters, in particular to a discrete non-standard MBUS communication method. The method comprises the following steps that S1, enabling aCIU display module to send one byte of data; S2, delaying X time, and then transmitting another byte of data by the CIU display module, with X being 1-; 10ms; And S3, repeating the step S2 until allthe data are sent. The method can ensure that the energy storage capacitor of the CIU display module is fully charged without modifying the hardware structure.

Description

technical field [0001] The invention relates to the technical field of electric energy meters, in particular to a communication method based on discrete non-standard MBUS. Background technique [0002] At present, the meter works under high voltage and high current for a long time. Due to the contact impedance between the wire and the relay pin, the impedance of the manganin sheet itself, the pressure sensitivity, the winding resistance and other factors, heat continues to be generated, which makes the PCB in the meter and the inside of the board The ambient temperature rose to about 72°C. The B-E junction voltage of the triode has a negative temperature characteristic, that is, the junction voltage decreases by 2~2.5mV for every 1°C temperature rise. At room temperature, the emitter junction voltage is about 0.6V; at 72°C, the emitter junction voltage decreases to about 0.49V. According to the current limiting of the circuit and the communication principle, at room temper...

Claims

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Application Information

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IPC IPC(8): G06F13/40G06F13/42
CPCG06F13/4063G06F13/42
Inventor 刘梦鑫
Owner NINGBO SANXING INTELLIGENT ELECTRIC