CN105160862A - M-BUS (METER-BUS) slave communication circuit - Google Patents
M-BUS (METER-BUS) slave communication circuit Download PDFInfo
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- CN105160862A CN105160862A CN201510454512.XA CN201510454512A CN105160862A CN 105160862 A CN105160862 A CN 105160862A CN 201510454512 A CN201510454512 A CN 201510454512A CN 105160862 A CN105160862 A CN 105160862A
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Abstract
The invention relates to an M-BUS (METER-BUS) slave communication circuit. The invention aims at providing an M-BUS slave communication circuit with low cost. According to the technical scheme for solving the problem, the M-BUS slave communication circuit is characterized by comprising a transmission circuit, a receiving circuit and a power supply circuit which are connected to one point mbuss, wherein the transmission circuit comprises a PNP-type triode Q4 and an NPN-type triode Q6, and a collector of the triode Q6 is connected with the point mbuss; the receiving circuit comprises a conversion circuit, wherein the input end of the conversion circuit is connected with the point mbuss, the output end of the conversion circuit is connected to a slave MCU, and the conversion circuit is used for converting the high-low electrical level at the point mbuss into a stable high-low electrical level signal which can be recognized by the slave MCU. The M-BUS slave communication circuit is mainly used for constructing a communication network among an intelligent electric meter, a customer display unit, a water meter and a gas meter.
Description
Technical field
The application relates to a kind of M-BUS from machine telecommunication circuit, is mainly used in building intelligent electric meter, user's display unit, communication network between water meter and gas meter.
Background technology
In some poverty-stricken areas, user's stealing electricity phenomenon is very serious, and power office wishes ammeter metering units and user's display unit to be installed separately, and allows user cannot touch ammeter anti-electricity-theft to carry out.And in some developed regions, increasing client wishes by ammeter by water meter, the connecting of gas meter, to realize three table data acquisition system (DAS)s of ammeter, water meter and gas meter.
Therefore, in Design of intelligent electric power meter, not only require the function realizing electric energy metrical, also will realize the information interaction with user's display unit (CustomerInterfaceUnit) simultaneously, and the acquisition function to the information such as water meter, gas meter.At present, M-BUS is widely used in energy acquisition system, has good opening.M-BUS (METER-BUS, BS_EN_1434-3_1997) is consumer instrument international communication standards, and it adopts the topological structure of bus mode, uses common two core cable to connect, and completes the function providing table meter power supply and data communication simultaneously.Need not polarity be distinguished when M-BUS bus connects again, can according to randomly topologically structured cable wiring manufacture, its construction cost and difficulty decline greatly.
Summary of the invention
The application, based on EN1434-3_1997 standard, provides a kind of M-BUS of low cost from machine telecommunication circuit.
The technical scheme that the application adopts is: M-BUS, from machine telecommunication circuit, is characterized in that: it comprises the transtation mission circuit, receiving circuit and the feed circuit that are connected to same point mbuss;
Described transtation mission circuit comprises PNP type triode Q4 and NPN type triode Q6, wherein the base stage of triode Q4 is connected to from machine MCU through resistance R9, emitter connects 3.3V power supply, and collector is connected with the base stage of triode Q6 on the one hand, is connected in analog on the other hand through resistance R45; The collector of triode Q6 is connected with mbuss point, and emitter is connected in analog through resistance R46;
Described receiving circuit comprises change-over circuit, and its input end is connected with mbuss point, and output terminal is connected to from machine MCU, for the low and high level at mbuss point place being converted to the stable low and high level signal that can identify from machine MCU;
Described feed circuit input end is connected with M-BUS bus, realizes the connection of transtation mission circuit, receiving circuit and M-BUS bus on the one hand, gives transtation mission circuit, receiving circuit on the other hand and provides working power from machine MCU.
Described change-over circuit comprises electric capacity C6, PNP type triode Q7 and NPN type triode Q8, wherein,
Electric capacity C6 one end is connected with mbuss point, and the other end is serially connected with resistance R4, resistance R8, resistance R11 successively, is simultaneously connected to semiconductor diode U6 at resistance R8 two ends;
The base stage of triode Q7 is connected to any point between resistance R4 and resistance R8, and emitter is connected with the resistance R11 other end, and collector is connected with the base stage of triode Q8 on the one hand, is connected in analog on the other hand through resistance R48;
The collector of triode Q8 is connected to from machine MCU as the output terminal of whole change-over circuit, and is connected with a pull-up resistor R43, and emitter is then connected in analog.
Described receiving circuit also comprises a constant-current source circuit, and its one end is connected with electric capacity C6 with mbuss point simultaneously, and the other end is connected in analog, for providing loop for the electric discharge of electric capacity C6.
Described constant-current source circuit comprises triode Q1 and Q5, wherein,
The base stage of triode Q1 is connected with the collector of mbuss point, electric capacity C6 with Q1 on the one hand after resistance R5 simultaneously, another aspect is direct to be connected with the collector of triode Q5, emitter is connected with the base stage of triode Q5 through resistance R38 on the one hand, is connected in analog on the other hand through resistance R38 and R44;
The emitter of triode Q5 is connected directly in analog.
Described triode Q1 and Q5 all adopts model to be the NPN type triode of BC817-40LT1.
Described feed circuit comprise interface MBUS, rectifier bridge AB1 and voltage stabilizer U1 for being connected with M-BUS bus, wherein interface MBUS two ends be connected to a TVS pipe, and be connected with the input end of rectifier bridge AB1, the positive pole of rectifier bridge AB1 output terminal is connected with the input end of voltage stabilizer U1 through semiconductor diode U7 on the one hand, be connected with mbuss point on the other hand, the negative pole of rectifier bridge AB1 output terminal is connected in analog, the output terminal of described semiconductor diode U7 and in analog between respectively and be connected to electric capacity C4 and C11.
The beneficial effect of the application is: 1, the application's circuit meets the standard of BS_EN_1434-3_1997, nonpolarity connection, supports the baud rate UART communication up to 9600.2, in point-to-point communication situation, desirable current value can be reached by the resistance of coupling R46 when lower or high voltage during transmitting, main frame is made to identify the change of low and high level, during reception, the design of circuit is less for the difference range requirement of bus low and high level, therefore normally can receive under higher or lower level, namely at wider operating at voltages, and then circuit design difficulty and the design cost of main frame can be reduced.3, the application is built by components and parts such as triode, electric capacity, resistance, and special MBUS communication integrate chip adopted compared to prior art, volume is less, and cost is lower.When 4, sending data from machine, the electric current in bus can be adjusted by the resistance of regulating resistance R46 as the case may be, the effective like this reliability that ensure that circuit circuit communication under various circumstances.5, the application's feed circuit provide the stabilized voltage supply of 3.3V, like this when deisgn product, can effectively utilize except the residue power consumption (being no more than 1.5mA from the maximum current of machine) from dynamo-electric road steady operation.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the application.
Fig. 2 be in the application main frame to from machine transmission data procedures in bus voltage signal figure.
Fig. 3 is from machine to the bus current signal graph Host Transfer data procedures in the application.
Embodiment
As shown in Figure 1, the present embodiment comprises the transtation mission circuit 1, _ Ji, _ Pi 9_ receiving circuit 2 and the feed circuit 3 that are connected to same point mbuss.
Described transtation mission circuit 1 comprises PNP type triode Q4 (model is BC807) and NPN type triode Q6 (model is BC817-40LT1), wherein the base stage of triode Q4 is connected to from machine MCU through resistance R9, emitter connects 3.3V power supply, collector is connected with the base stage of triode Q6 through resistance R47 (0 Europe) on the one hand, is connected in analog on the other hand through resistance R45; The collector of triode Q6 is connected with mbuss point, and emitter is connected in analog through resistance R46.
Described receiving circuit 2 applies RC firstorder circuit principle, comprises change-over circuit 2-1 and constant-current source circuit 2-2; Wherein,
Change-over circuit 2-1 input end is connected with mbuss point, and output terminal is connected to from machine MCU, for the low and high level at mbuss point place being converted to the stable low and high level signal that can identify from machine MCU; In this example, described change-over circuit 2-1 comprises electric capacity C6, PNP type triode Q7 (model is BC807) and NPN type triode Q8 (model is BC817-40LT1);
Electric capacity C6 one end is connected with mbuss point (collector of triode Q6), and the other end is serially connected with resistance R4, resistance R8, resistance R11 successively, is simultaneously connected to semiconductor diode U6 at resistance R8 two ends; For converting the optional position of low and high level between resistance R4, resistance R8 at mbuss point place to a square-wave signal, namely under the effect of electric capacity C6, resistance R4, resistance R8, semiconductor diode U6 (model BAT54C), between resistance R4, resistance R8, optional position forms a square-wave signal, and the high level of this square-wave signal is 3.2-3.4V, low level is 0-80mV;
The base stage of triode Q7 is connected to any point between resistance R4 and resistance R8, and emitter is connected with the resistance R11 other end, and collector is connected with the base stage of triode Q8 on the one hand, is connected in analog on the other hand through resistance R48; Conducting and the cut-off of triode Q7 is controlled according to described square-wave signal;
The collector of triode Q8 is connected to from machine MCU as the output terminal of whole change-over circuit, and is connected with a pull-up resistor R43, and emitter is then connected in analog; Control conducting and the cut-off of triode Q8 according to the conducting of triode Q7 and cut-off, thus the low and high level at mbuss point place is converted to the stable low and high level signal that can identify from machine MCU the most at last.
Constant-current source circuit 2-2 one end is connected with electric capacity C6 with mbuss point simultaneously, and the other end is connected in analog, for providing loop for the electric discharge of electric capacity C6; Comprise triode Q1 and triode Q5, model is BC817-40LT1, wherein,
The base stage of triode Q1 is connected with electric capacity C6 with mbuss point on the one hand after resistance R5 simultaneously, another aspect is direct to be connected with the collector of triode Q5, collector is directly connected with electric capacity C6 with mbuss point, emitter is connected with the base stage of triode Q5 through resistance R38 on the one hand, is connected in analog on the other hand through resistance R38 and R44;
The emitter of triode Q5 is connected directly in analog.
Described feed circuit 3 comprise the interface MBUS for being connected with M-BUS bus, rectifier bridge AB1 (model B6S, effect is the nonpolarity requirement in order to meet in M-BUS bus standard, namely connect can proper communication for two line transpositions, no matter how positive and negative AB1 input end 2 pin 4 pin is, always ensureing that AB1 exports 1 pin is just, 3 pin are negative) and voltage stabilizer U1 (model HT7133), wherein interface MBUS two ends be connected to a TVS pipe (model SMBJ30CA), and be connected with the input end of rectifier bridge AB1, the positive pole of rectifier bridge AB1 output terminal is connected with the input end of voltage stabilizer U1 through semiconductor diode U7 (model BAT54C) on the one hand, be connected with mbuss point on the other hand, the negative pole of rectifier bridge AB1 output terminal is connected in analog, the output terminal of described semiconductor diode U7 and in analog between respectively and be connected to electric capacity C4 and C11 of filtering.
The application's principle of work is:
M-BUS communicates master-slave equipment by two cables connections, and is powered from machine by these two cables by main frame.Main frame is that (what give tacit consent to when not sending data is high level to voltage modulated mode to what adopt from machine transmission data (namely receiving data from machine), the scope of high level is 15 ~ 25V, low level is 0-0.5 high level doubly, generally choose 1/3 of high level), send data acquisition electric current modulation system from machine to main frame.
When receiving data from machine, direct current in M-BUS bus obtains low and high level at mbuss point place after rectifier bridge AB1, this low and high level is under the effect of electric capacity C6, resistance R4, resistance R8, semiconductor diode U6, between resistance R4, resistance R8, optional position forms a square-wave signal (high level of square-wave signal be 3.2-3.4V, low level be 0-80mV), control conducting and the cut-off of triode Q7, and then control conducting and the cut-off of triode Q8, thus change into the stable low and high level signal that can identify from machine MCU.As shown in Figure 2, in transmission data procedures in bus, high level signal VBUS=VMARK is defined as the voltage difference (as shown in Figure 3) from machine terminated line terminal MBUSA and MBUSB, and it depends on the distance (because distance have impact on pressure drop cable on) of main website to slave station.
From machine send data, when from machine to main frame send high level time, triode Q4, Q6 end, the electric current in M-BUS bus remains unchanged, no-voltage fluctuate, main frame identification its be high level; Otherwise when sending low level from machine to main frame, triode Q4, Q6 conducting, electric current in M-BUS bus increases, cause M-BUS bus produces small voltage fluctuation, main frame is by identifying this small voltage signal, identify low level, the current drain of M-BUS bus is adjusted by the resistance of regulating resistance R46.As shown in Figure 2, IMC is the voltage at triode Q6 second pin place (emitter) and the business of resistance R46 to M-BUS bus current signal in transmitting procedure, namely flows through the electric current of resistance R46.
Claims (1)
1. M-BUS is from a machine telecommunication circuit, it is characterized in that: it comprises the transtation mission circuit (1), receiving circuit (2) and the feed circuit (3) that are connected to same point mbuss; Described transtation mission circuit (1) comprises PNP type triode Q4 and NPN type triode Q6, wherein the base stage of triode Q4 is connected to from machine MCU through resistance R9, emitter connects 3.3V power supply, and collector is connected with the base stage of triode Q6 on the one hand, is connected in analog on the other hand through resistance R45; The collector of triode Q6 is connected with mbuss point, and emitter is connected in analog through resistance R46; Described receiving circuit (2) comprises change-over circuit (2-1), and its input end is connected with mbuss point, and output terminal is connected to from machine MCU, for the low and high level at mbuss point place being converted to the stable low and high level signal that can identify from machine MCU; Described feed circuit (3) input end is connected with M-BUS bus, realize transtation mission circuit (1), receiving circuit (2) and the connection of M-BUS bus on the one hand, give transtation mission circuit (1), receiving circuit (2) on the other hand and provide working power from machine MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510454512.XA CN105160862A (en) | 2015-07-30 | 2015-07-30 | M-BUS (METER-BUS) slave communication circuit |
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| CN201510454512.XA CN105160862A (en) | 2015-07-30 | 2015-07-30 | M-BUS (METER-BUS) slave communication circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302239A (en) * | 2017-10-31 | 2018-07-20 | 瑞纳智能设备股份有限公司 | A kind of MBUS control circuits and its control method for thermostat valve |
| WO2019210689A1 (en) * | 2018-05-03 | 2019-11-07 | 珠海格力电器股份有限公司 | Slave device communication circuit, slave device, electrical equipment, and master-slave device communication circuit and method |
| CN112637028A (en) * | 2020-12-23 | 2021-04-09 | 国网江苏省电力有限公司 | M-BUS communication circuit |
| CN112833553A (en) * | 2020-04-03 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Water heater control system and water heater |
-
2015
- 2015-07-30 CN CN201510454512.XA patent/CN105160862A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302239A (en) * | 2017-10-31 | 2018-07-20 | 瑞纳智能设备股份有限公司 | A kind of MBUS control circuits and its control method for thermostat valve |
| WO2019210689A1 (en) * | 2018-05-03 | 2019-11-07 | 珠海格力电器股份有限公司 | Slave device communication circuit, slave device, electrical equipment, and master-slave device communication circuit and method |
| CN112833553A (en) * | 2020-04-03 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Water heater control system and water heater |
| CN112637028A (en) * | 2020-12-23 | 2021-04-09 | 国网江苏省电力有限公司 | M-BUS communication circuit |
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Application publication date: 20151216 |