CN109634897A

CN109634897A - Based on the nonstandard MBUS communication means of discrete

Info

Publication number: CN109634897A
Application number: CN201811563223.3A
Authority: CN
Inventors: 刘梦鑫
Original assignee: Ningbo Sanxing Smart Electric Co Ltd
Current assignee: Ningbo Sanxing Smart Electric Co Ltd
Priority date: 2018-12-20
Filing date: 2018-12-20
Publication date: 2019-04-16

Abstract

The present invention relates to electric energy meter technical fields, more particularly to one kind to be based on the nonstandard MBUS communication means of discrete.It is the following steps are included: S1, CIU display module send a byte data；S2, delay X time, then CIU display module is sending another byte data, and X is 1-10ms；S3, step S2 is repeated, until all data are sent.This method does not need modification hardware configuration and ensures that the storage capacitor charging of CIU display module itself is sufficient.

Description

Based on the nonstandard MBUS communication means of discrete

Technical field

The present invention relates to electric energy meter technical fields, more particularly to one kind to be based on the nonstandard MBUS communication means of discrete.

Background technique

Currently, meter works long hours under high-voltage large current, because of contact impedance, the copper-manganese of conducting wire and relay foot piece The factors such as piece direct impedance and pressure-sensitive, wire resistor, persistently generate heat, so that PCB and intraplate setting temperature rise in table To about 72 DEG C.And there are negative temperature characteristic, i.e. every 1 DEG C of temperature raising, 2 ~ 2.5mV of junction voltage reduction for the B-E junction voltage of triode. Under room temperature, transmitting junction voltage is about 0.6V；At 72 DEG C, transmitting junction voltage decreases to about 0.49V.According to the current limliting of circuit and Principle of Communication, under room temperature, when CIU display module sends low level, MBUS circuit maximum load current is 15mA;At 72 DEG C, The maximum load current of circuit is 12.25mA.As it can be seen that at high temperature, the load capacity of circuit can be decreased significantly.

Due to CIU display module power supply from meter MBUS communication line, CIU display module send data 0 when, Voltage on communication line can reduce, and indicate low level signal, and during this signal continues, the power supply of CIU display module comes first Derived from the storage capacitor of CIU itself, when storage capacitor side pressure drops to it is lower than the level of low level signal when, MBUS circuit will By communication line to capacitor charging.At high temperature, the decline of MBUS circuit load causes to the charging ability of storage capacitor Deficiency, with the increase of call duration time, the side pressure of storage capacitor certainly will decline always, because its side pressure is unable to catastrophe characteristics, finally When CIU display module being caused to send high level, the high level on MBUS communication line is not high enough, and circuit can not recognize high level, And then communication failure.

If for from hardware, guide rail meter is unable to improve the problem of communication line level declines, while CIU shows mould Block volume production, and in view of the structural member space of CIU display module is small and the limitation of cost, pass through the side for increasing storage capacitor It is also unrealistic that formula changes CIU display module.

Summary of the invention

Ensure that CIU is aobvious the technical problems to be solved by the present invention are: providing one kind and not needing modification hardware configuration Show the storage capacitor charging of module itself it is sufficient based on the nonstandard MBUS communication means of discrete.

The technical scheme adopted by the invention is that: one kind being based on the nonstandard MBUS communication means of discrete, it is characterised in that: S1, CIU display module send a byte data；

S2, delay X time, then CIU display module is sending another byte data, and X is 1-10ms；

S3, step S2 is repeated, until all data are sent.

Preferably, step S1 needs to close external equipment before CIU display module sends data.

Preferably, the external equipment includes buzzer and LED light.

Preferably, the response time N of the buzzer, and N is less than 200ms.

Preferably, the response time of the buzzer is 20ms.

Preferably, being needed after CIU display module data are sent Y seconds, bee when electric energy meter triggers alarm condition Ring device could issue alarm sound.

Preferably, the Y is 1-10s.

Preferably, the Y is 8s.

Preferably, setting X as 3-6ms when temperature is more than 30 DEG C in electric energy meter.

Preferably, setting X as 1-4ms when temperature is less than 0 DEG C in electric energy meter.

Using above method compared with prior art, the invention has the following advantages that by prolonging after sending every byte A period of time late can solve storage capacitor charging not as the time charged to CIU storage capacitor from software view in this way Full situation so that communication efficiency is more preferable, and does not need to carry out the modification of hardware view.

And to avoid the problem that storage capacitor undercharge during MBUS circuit communication, CIU display module is being communicated When can close all external equipments, such as buzzer and LED light, power consumption is reduced, to guarantee the normality and reliability of communication；Work as bee When ring device continues the response time greater than 200ms, power consumption is larger, storage capacitor undercharge, causes CIU display module to reset, is This problem is avoided, the buzzer in CIU display module continues the response time and by 200ms is reduced to 20ms；To avoid MBUS electric In the communication process of road the problem of storage capacitor undercharge, when meter remaining sum value is less than the alarm threshold value of setting, CIU shows mould Block buzzer after 8s is completed in communication can just be rung.

Detailed description of the invention

Fig. 1 is the MBUS communication waveforms figure before improving.

Fig. 2 is the analysis chart of high temperature communication.

Fig. 3 is the analysis chart of low temperature communication.

Fig. 4 is the MBUS communication waveforms figure after improving under the condition of high temperature.

Fig. 5 is the MBUS communication waveforms figure after improving under low-temperature condition.

Specific embodiment

The present invention is described further below in conjunction with attached drawing and specific embodiment, but the present invention be not limited only to it is following Specific embodiment.

As shown in Figure 1, data are data when CIU is sent in figure for the MBUS communication waveforms figure before improvement, can see Out, level when CIU sends data on communication line is on a declining curve, can be approximately an oblique line.The transverse projection of this oblique line Length is about 160ms, and longitudinal projection's length is 2V, then can calculate slope is -0.0125V/ms.For 1 byte, 10 bit Data volume for, under 2400 baud rates, the duration be 10*416us=4.16ms, then in the time of every byte on communication line Voltage about reduce 0.0125V/ms*4.16ms=0.052V.

Postpone a period of time after every byte that CIU sends data, the storage capacitor for circuit to CIU charges, and makes to lead to High level under returning to normal on letter line, as long as charging time long enough in this way, by what is reduced in previous byte duration 0.052V makes up back.During subsequent byte continues, the not high enough phenomenon of high level would not occur.

After the completion of CIU sends data, will rise because of charging on communication line, ascendant trend can also be straight similar to one Line, slope are calculated as 2V/60ms=0.0333V/ms, then 0.052V are made up the time back as 0.052V/ (0.0333V/ ms)=1.5615ms.One times of allowance is stayed, then the minimum time postponed is 2*1.5615ms=3.123ms.

When temperature reaches 75 DEG C in meter, 0 test (2400 baud rate) of hair, as shown in Fig. 2, can be seen that from the left side Fig. 2 At 75 DEG C of high temperature, the maximum number of byte of CIU hair 0 is 11 when telecommunication circuit can effectively identify high level；It can from the right side Fig. 2 Out, the slope of the downward trend of MBUS communication line level is about -19.565mV/ms, and level climbing speed is about 26.923mV/ ms。

When temperature is as low as -45 DEG C in meter, 0 test (2400 baud rate) of hair, as shown in figure 3, can from the left side Fig. 3 Out, at -45 DEG C, the maximum number of byte of CIU hair 0 is 19 when telecommunication circuit can effectively identify high level；It can from the right side Fig. 3 Out, the slope of the downward trend of MBUS communication line level is about -20mV/ms, and level climbing speed is about 70mV/ms.

For the data volume of 2400 baud rates and 10 bit of every byte, duration 4.167ms, 75 DEG C of high temperature In the case of, by the time that the level declined in every byte time supplements back former level be approximately 4.167*19.565/26.923= 3.028ms, in the case of -45 DEG C of low temperature, this time is approximately 4.167*20/70=1.191ms.The shortest time postponed needed for then And made allowance is 1.5*3.028=4.524ms, takes 5ms.

So this specific embodiment optimal delay time is set as sending the interval every byte delay 5ms of data.

Plan-validation

CIU is sent out to the test program burning of 100 bytes 0 into CIU automatically, guide rail meter and CIU are then placed in high temperature examination simultaneously In tryoff, CIU is tested at 75 DEG C and sends out 0 limit and improves verifying, is illustrated in figure 4 the communication waveforms at 75 DEG C of high temperature

CIU is sent out to the test program burning of 100 bytes 0 into CIU automatically, guide rail meter and CIU are then placed in low temperature examination simultaneously In tryoff, CIU is tested at -45 DEG C and sends out 0 limit and improves verifying.It is illustrated in figure 5 the communication waveforms at -45 DEG C of high temperature.

It can be seen that after postponing 5ms from the test waveform of Fig. 4 and Fig. 5, communication level keeps flat between high period Surely, the 0 of all 100 bytes can correctly be transmitted.

And in order to avoid the problem of storage capacitor undercharge, also having done other measures during MBUS circuit communication:

1. CIU closes all external equipments in communication, such as buzzer and LED light, power consumption is reduced, to guarantee the normality of communication And reliability.

2. the CIU buzzer response time is reduced to 20ms by 200ms.

3. CIU buzzer after 8s is completed in communication can just be rung when meter remaining sum value is less than alarm threshold value.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of skill in the art that it still can be right Technical solution documented by previous embodiment is modified, or is replaced on an equal basis to part of technical characteristic；And these It modifies or replaces, the essence of corresponding technical solution is not made to be detached from the spirit and model of technical solution of various embodiments of the present invention It encloses.

Claims

1. one kind be based on the nonstandard MBUS communication means of discrete, it is characterised in that: it the following steps are included:

S1, CIU display module send a byte data；

S3, step S2 is repeated, until all data are sent.

2. according to claim 1 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: step S1 is aobvious in CIU Show and needs to close external equipment before module sends data.

3. according to claim 2 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: the external equipment packet Include buzzer and LED light.

4. according to claim 3 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: the sound of the buzzer N between seasonable, and N is less than 200ms.

5. according to claim 4 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: the sound of the buzzer It is 20ms between seasonable.

6. according to claim 3 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: reported when electric energy meter triggers When alert state, need after CIU display module data are sent Y seconds, buzzer could issue alarm sound.

7. according to claim 6 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: the Y is 1-10s.

8. according to claim 7 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: the Y is 8s.

9. according to claim 1 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: when temperature in electric energy meter When more than 30 DEG C, X is set as 3-6ms.

10. according to claim 1 be based on the nonstandard MBUS communication means of discrete, it is characterised in that: when warm in electric energy meter When degree is less than 0 DEG C, X is set as 1-4ms.