CN204669340U - M-BUS host circuit - Google Patents
M-BUS host circuit Download PDFInfo
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- CN204669340U CN204669340U CN201520334603.5U CN201520334603U CN204669340U CN 204669340 U CN204669340 U CN 204669340U CN 201520334603 U CN201520334603 U CN 201520334603U CN 204669340 U CN204669340 U CN 204669340U
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Abstract
The utility model discloses a kind of M-BUS host circuit.It comprises bus driving circuits and backhaul signals extracts circuit, and described backhaul signals extraction circuit is held with the MBUS-of described bus driving circuits and is connected.M-BUS host circuit of the present utility model utilizes triode to form adjustable voltage driver and drives bus, enhances the driving force of bus, improves the load capacity of bus; Adopt the backhaul signals simplified to extract circuit and reduce cost, reduce current sampling resistor resistance simultaneously, thus decrease the energy dissipation on sampling resistor, further ensure the driving force of bus; By adding bus power source switch module in bus driving circuits, making bus optionally carry out switch, decreasing energy dissipation.
Description
Technical field
The utility model belongs to water, gas meter remote monitoring modules field, particularly relates to a kind of M-BUS host circuit.
Background technology
M-BUS (symphonic mbus, long-distance meter-reading system) is 2 line two lines bus of European standard, is mainly used in consuming measuring instrument such as hotlist and water meter series.For a long-distance meter-reading system, the data that bus is transmitted are exactly the significant datas such as the water, electricity, gas consumed of terminal use, therefore require very high to the anti-external disturbance of bus, want the coupling interference resisting various capacitive, perception, all from equipment and from all mutually isolated between equipment and main equipment.Require that again networking cost is relatively low, transmission line need not use shielded type cable, and is cost-saving simultaneously, and the mode of remote power feeding be adopted to providing power supply from equipment, to reduce the use of components and parts as far as possible.The problem solving these reality must adopt a kind of suitable bus structures.M-BUS is that a kind of special .M-BUS transmitting the data/address bus design of information for consuming measuring instrument sum counter has many-sided application at building and the collection of industrial energy consumption data.The proposition of M-BUS bus meets the networking of utility meter and the needs of remote meter reading, and it can also meet the particular/special requirement of remote power feeding or battery power supply system simultaneously.The bus type topological structure of M-BUS serial communication mode is applicable to the networking requirement of reliable, the low cost of utility meter very much, can connect hundreds of from equipment in the distance of several kilometers.Equipment in M-BUS bus is divided into main frame and table tool two kinds, and wherein main frame is not to the drive circuit of bus because have ready-made chip to use, and in reality, the analog circuit of designed, designed that adopts realizes more.Traditional host circuit design, because driving force is not enough, bus load about 60 can only show tool; Traditional design needs to use high-power, high voltage amplifier and comparator, and cost is higher; And when not using, the power supply in bus can not turn off, and causes the waste of the energy.
Utility model content
Goal of the invention of the present utility model is: in order to solve that existing host circuit driving force is in the art not enough, cost is high and the problem such as energy waste, the utility model proposes a kind of M-BUS host circuit.
The technical solution of the utility model is: a kind of M-BUS host circuit, and comprise bus driving circuits and backhaul signals extraction circuit, described backhaul signals is extracted circuit and is connected with described bus driving circuits; Described bus driving circuits comprises bus power source switch module, voltage driven module, sends signal driver module, the first voltage reference module, the second voltage reference module and trailing edge processing module; Described bus power source switch module one end access bus power source, the other end and voltage driven model calling, the other end of described voltage driven module is held as the MBUS+ of bus driving circuits; Described voltage driven module is also sequentially connected in series with the first voltage reference module and the second voltage reference module, and the other end ground connection of described second voltage reference module the MBUS-as bus driving circuits hold; The access of described transmission signal driver module one end sends signal, and the other end is connected with the second voltage reference module; Described trailing edge processing module one end and voltage driven model calling, the other end is connected with the second voltage reference module.
Further, described voltage driven module comprises triode; The collector electrode of described triode is connected with bus power source switch module, and emitter and trailing edge process model calling are also held as MBUS+, and base stage is connected with the first voltage reference module.
Further, the MBUS-end of described bus driving circuits is in series with current sampling resistor.
Further, described backhaul signals extraction circuit comprises signal amplification computing module, accurate peak value hold module and comparison module.
Further, described signal amplification computing module comprises the first operational amplifier and the first resistance; Described first operational amplifier is connected with the first resistor coupled in parallel, and one end of described first resistance is connected with the in-phase input end of the first operational amplifier and inverting input and accesses respectively and adopts signal, and the other end is connected with the output of the first operational amplifier.
Further, described accurate peak value hold module comprises the second operational amplifier, the second resistance, diode, electric capacity and the 3rd resistance; The in-phase input end of described second operational amplifier is connected with one end of the second resistance, output is connected with the positive pole of diode, inverting input is connected with one end of the negative pole of diode, the positive pole of electric capacity and the 3rd resistance respectively, and the negative pole of described electric capacity is connected with the other end of the 3rd resistance and ground connection.
Further, described comparison module comprises comparator and the 4th resistance; The in-phase input end of described comparator is connected with one end of the 4th resistance, and output exports Received signal strength; The other end of described 4th resistance is connected with power supply.
The beneficial effects of the utility model are: M-BUS host circuit of the present utility model utilizes triode to form adjustable voltage driver and drives bus, enhances the driving force of bus, improves the load capacity of bus; Adopt the backhaul signals simplified to extract circuit and reduce cost, reduce current sampling resistor resistance simultaneously, thus decrease the energy dissipation on sampling resistor, further ensure the driving force of bus; By adding bus power source switch module in bus driving circuits, making bus optionally carry out switch, decreasing energy dissipation.
Accompanying drawing explanation
Fig. 1 is M-BUS host circuit schematic diagram of the present utility model.
Fig. 2 is bus driving circuits schematic diagram of the present utility model.
Fig. 3 is that backhaul signals of the present utility model extracts circuit theory diagrams.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be M-BUS host circuit schematic diagram of the present utility model.A kind of M-BUS host circuit, comprises bus driving circuits and backhaul signals extracts circuit, and backhaul signals is extracted circuit and is connected with bus driving circuits; Bus driving circuits comprises bus power source switch module, voltage driven module, sends signal driver module, the first voltage reference module, the second voltage reference module and trailing edge processing module; Bus power source switch module one end access bus power source, the other end and voltage driven model calling, the other end of voltage driven module is held as the MBUS+ of bus driving circuits; Voltage driven module is also sequentially connected in series with the first voltage reference module and the second voltage reference module, and the other end ground connection of the second voltage reference module the MBUS-as bus driving circuits hold; Send the access of signal driver module one end and send signal, the other end is connected with the second voltage reference module; Trailing edge processing module one end and voltage driven model calling, the other end is connected with the second voltage reference module.
Based on above-mentioned M-BUS host circuit, the utility model is in series with current sampling resistor at the MBUS-end of bus driving circuits, for extracting the current signal of table tool loopback.
Based on above-mentioned M-BUS host circuit, backhaul signals of the present utility model is extracted circuit and is comprised signal amplification computing module, accurate peak value hold module and comparison module, and signal amplifies computing module, accurate peak value hold module is connected successively with comparison module.
As shown in Figure 2, be bus driving circuits schematic diagram of the present utility model.In bus driving circuits of the present utility model, bus power source switch module adopts metal-oxide-semiconductor and triode T1 control bus mains switch, opens or closes bus power source, avoid the waste of the energy according to user demand; The grid of metal-oxide-semiconductor is connected with the collector electrode of triode T1 and one end of resistance R1 respectively, the drain electrode of metal-oxide-semiconductor is connected with the other end of resistance R1 and the positive pole of diode D1 and accesses power supply respectively, the source electrode of metal-oxide-semiconductor is connected with the negative pole of diode D1, the grounded emitter of triode T1, the base stage of triode T1 is connected with one end of resistance R2, the other end access bus power source control signal of resistance R2.In bus driving circuits of the present utility model, voltage driven module adopts triode T2 to form adjustable voltage driver and drives bus, increases bus driver ability, improves the load capacity of bus; The collector electrode of triode T2 is connected with the source electrode of metal-oxide-semiconductor and one end of resistance R3 respectively, and the emitter of triode T2 is held as the MBUS+ of bus driving circuits, and the base stage of triode T2 is connected with the other end of resistance R3.In bus driving circuits of the present utility model, the first voltage reference module adopts diode D2; The negative pole of diode D2 is connected with the base stage of triode T2.In bus driving circuits of the present utility model, the second voltage reference module adopts diode D3; The negative pole of diode D3 is connected with the positive pole of diode D2, and the negative pole of diode D3 is connected with the emitter of triode T1.Send signal driver module in bus driving circuits of the present utility model and adopt triode T3; The base stage of triode T3 is connected with one end of resistance R5, and the collector electrode of triode T3 is connected with the negative pole of diode D3, and the emitter of triode T3 is connected with the positive pole of diode D3.In bus driving circuits of the present utility model, trailing edge processing module adopts triode T4; The base stage of triode T4 is connected with one end of resistance R4, the emitter of triode T4 is connected with the emitter of triode T2, the collector electrode of triode T4 is connected with one end of resistance R6, and the other end of resistance R4 is connected with the base stage of triode T2, and the other end of resistance R6 is connected with the positive pole of diode D3.Current sampling resistor of the present utility model is connected on the MBUS-end of bus driving circuits.
In bus driving circuits of the present utility model, accessing bus power source by bus power source switch module is that whole M-BUS host circuit is powered, and the switch of control bus power supply; When not using M-BUS, bus power source switch can be utilized to close bus power source, avoid the waste of the energy, reduce the power consumption of bus.Adopt triode T2 to form adjustable voltage driver in voltage driven module and drive bus, increase bus driver ability, make the load capacity of bus heighten 300 table tools.Because M-BUS bus cable and table tool all exist parasitic capacitance, simple use voltage driver cannot produce good trailing edge, and the utility model is by adding trailing edge processing module, when the voltage that voltage driver exports becomes 24V from 36V, utilize trailing edge processing module to be clamped down on fast by the voltage in M-BUS bus on the 24V voltage of voltage driver output, solve the simple problem using voltage driver cannot produce good trailing edge.
As shown in Figure 3, for backhaul signals of the present utility model extracts circuit theory diagrams.Backhaul signals of the present utility model is extracted signal amplification computing module in circuit and is adopted the first operational amplifier sampled signal to be amplified; One end of first resistance is connected with the in-phase input end of the first operational amplifier and inverting input and accesses sampled signal respectively.Backhaul signals of the present utility model is extracted accurate peak value hold module in circuit and is adopted the second operational amplifier sampling to obtain the standard value of extraction table tool loopback current signal; The in-phase input end of the second operational amplifier is connected with the output of the first operational amplifier, the output of the second operational amplifier is connected with the positive pole of diode, the inverting input of the second operational amplifier is connected with one end of the negative pole of diode, the positive pole of electric capacity and the 3rd resistance respectively, the negative pole of electric capacity is connected with the other end of the 3rd resistance and ground connection, and one end of the second resistance is connected with the other end of the first resistance and puts up a bridge with the output of the first operational amplifier and is connected.Backhaul signals of the present utility model is extracted comparison module in circuit and is adopted comparator to compare sampled signal and standard value, and the current signal of table tool loopback is reverted to digital signal (i.e. acknowledge(ment) signal); The output of comparator exports Received signal strength, and the inverting input of comparator is connected with the negative pole of diode, and one end of the 4th resistance is connected with the in-phase input end of comparator and the other end of the second resistance respectively, the other end access power supply of the 4th resistance.
Backhaul signals of the present utility model extracts the MBUS-end that current sampling resistor is arranged on bus driving circuits by circuit, adopts simple calculations amplifier, reduces cost and the power consumption of circuit; Meanwhile, reduce the resistance of current sampling resistor, thus decrease the energy waste on sampling resistor, further increase the driving force of bus.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present utility model, should be understood to that protection range of the present utility model is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from the utility model essence according to these technology enlightenment disclosed in the utility model, and these distortion and combination are still in protection range of the present utility model.
Claims (7)
1. a M-BUS host circuit, is characterized in that, comprise bus driving circuits and backhaul signals extraction circuit, described backhaul signals is extracted circuit and is connected with described bus driving circuits; Described bus driving circuits comprises bus power source switch module, voltage driven module, sends signal driver module, the first voltage reference module, the second voltage reference module and trailing edge processing module; Described bus power source switch module one end access bus power source, the other end and voltage driven model calling, the other end of described voltage driven module is held as the MBUS+ of bus driving circuits; Described voltage driven module is also sequentially connected in series with the first voltage reference module and the second voltage reference module, and the other end ground connection of described second voltage reference module the MBUS-as bus driving circuits hold; The access of described transmission signal driver module one end sends signal, and the other end is connected with the second voltage reference module; Described trailing edge processing module one end and voltage driven model calling, the other end is connected with the second voltage reference module.
2. M-BUS host circuit as claimed in claim 1, it is characterized in that, described voltage driven module comprises triode; The collector electrode of described triode is connected with bus power source switch module, and emitter and trailing edge process model calling are also held as MBUS+, and base stage is connected with the first voltage reference module.
3. M-BUS host circuit as claimed in claim 2, is characterized in that, the MBUS-end of described bus driving circuits is in series with electric current and adopts resistance.
4. M-BUS host circuit as claimed in claim 3, is characterized in that, described backhaul signals is extracted circuit and comprised signal amplification computing module, accurate peak value hold module and comparison module.
5. M-BUS host circuit as claimed in claim 4, is characterized in that, described signal amplifies computing module and comprises the first operational amplifier and the first resistance; Described first operational amplifier is connected with the first resistor coupled in parallel, and one end of described first resistance is connected with the in-phase input end of the first operational amplifier and inverting input and accesses respectively and adopts signal, and the other end is connected with the output of the first operational amplifier.
6. M-BUS host circuit as claimed in claim 5, it is characterized in that, described accurate peak value hold module comprises the second operational amplifier, the second resistance, diode, electric capacity and the 3rd resistance; The in-phase input end of described second operational amplifier is connected with one end of the second resistance, output is connected with the positive pole of diode, inverting input is connected with one end of the negative pole of diode, the positive pole of electric capacity and the 3rd resistance respectively, and the negative pole of described electric capacity is connected with the other end of the 3rd resistance and ground connection.
7. M-BUS host circuit as claimed in claim 6, it is characterized in that, described comparison module comprises comparator and the 4th resistance; The in-phase input end of described comparator is connected with one end of the 4th resistance, and output exports Received signal strength; The other end of described 4th resistance is connected with power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520334603.5U CN204669340U (en) | 2015-05-22 | 2015-05-22 | M-BUS host circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520334603.5U CN204669340U (en) | 2015-05-22 | 2015-05-22 | M-BUS host circuit |
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| CN204669340U true CN204669340U (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520334603.5U Expired - Fee Related CN204669340U (en) | 2015-05-22 | 2015-05-22 | M-BUS host circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901682A (en) * | 2015-05-22 | 2015-09-09 | 成都前锋电子仪器有限责任公司 | M-Bus host circuit |
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2015
- 2015-05-22 CN CN201520334603.5U patent/CN204669340U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901682A (en) * | 2015-05-22 | 2015-09-09 | 成都前锋电子仪器有限责任公司 | M-Bus host circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 Termination date: 20200522 |