CN205374584U - M -bus communication overload detection circuitry - Google Patents
M -bus communication overload detection circuitry Download PDFInfo
- Publication number
- CN205374584U CN205374584U CN201620043810.XU CN201620043810U CN205374584U CN 205374584 U CN205374584 U CN 205374584U CN 201620043810 U CN201620043810 U CN 201620043810U CN 205374584 U CN205374584 U CN 205374584U
- Authority
- CN
- China
- Prior art keywords
- circuit
- bus
- comparator
- reference voltage
- overload detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a M -bus communication overload detection circuitry, including comparator, controller, reference voltage regulator circuit and current sampling circuit, the current signal of current sampling circuit sampling M -bus bus converts the syntropy input that voltage signal inputed the comparator into, standard voltage passes through in the source reverse input end of reference voltage regulator circuit output reference voltage to the comparator, output M -bus overload detection signal to the controller of comparator. The utility model discloses an unsteady too big erroneous judgement problem that leads to the fact of the total line voltage of M -bus has effectively been avoided to the overload circumstances that adopts the mode that detects M -bus bus current signal to determine the M -bus bus, adopting reference voltage adjustment circuit regulation reference voltage, can carrying out the reference voltage adjustment according to the particular case and the circuit characteristic demand of M -bus bus, the commonality is good, adopt special comparator to carry out the comparison of circuit voltage, the consumption is little, effectively prevents the damage of device.
Description
Technical field
This utility model is specifically related to a kind of M-bus communication overload detection circuit.
Background technology
Along with the raising of the development of national economy technology and people's living standard, various intelligent meter meters have also progressively goed deep among daily life.Existing intelligent metering instrument function is various, wherein one of unmanned meter-reading function standard configuration having had become as intelligence instrument.
M-bus is a kind of bus mode, is exclusively used in and checks meter.M-bus is called for short meter bus, has double bus nonpolarity, and wiring is without topology requirement, always line self-powered, and capacity of resisting disturbance is strong, the relaying advantages such as progression is many, tape terminal progression is many, simple, reliable.Therefore, it is widely applied in the communicating of water meter, gas meter and hotlist, and M-bus bus is divided into host side and from machine end two ways.For overload detector, it is mounted in main frame side and obtains.At present, the M-bus overload detection circuit of host side is as shown in Figure 1: its overload detection mode mainly detects the size of voltage.This way has following defects that one, due in M-bus bus the domain of walker of voltage relatively big, easily make system produce erroneous judgement situation by detecting voltage；Two, the input voltage range of comparator is wide, and power consumption own is relatively big, easily causes device heating to damage.
Utility model content
The purpose of this utility model is in that providing a kind of detects M-bus communication overload detection circuit accurate, that failure rate is low, circuit are simple and reliable.
This M-bus communication overload detection circuit that this utility model provides, including comparator and controller, also includes reference voltage regulating circuit and current sampling circuit；The current signal of current sampling circuit sampling M-bus bus, is converted to voltage signal and is input to the input in the same direction of comparator；Standard voltage source is by the reverse input end of reference voltage regulating circuit output reference voltage to comparator；The outfan output M-bus overload detection signals of comparator is to controller.
Described M-bus communication overload detection circuit also includes filter circuit, and filter circuit is serially connected between current sampling circuit and comparator, for filtering the interference signal in current sampling circuit output signal.
Described M-bus communication overload detection circuit also includes protection circuit, and protection circuit is serially connected between current sampling circuit and comparator, for ensureing the properly functioning of circuit.
Described reference voltage regulating circuit is resistor voltage divider circuit.
Described current sampling circuit is sampling resistor.
Described filter circuit is capacitor filter.
Described protection circuit includes TVS pipe and pull down resistor.
Described comparator is for recommending output comparator.
This utility model, by adopting the mode of detection M-bus bus current signal to judge the overload situations of M-bus bus, effectively prevent the M-bus bus voltage excessive erroneous judgement problem caused of floating；Reference voltage regulating circuit is adopted to adjust reference voltage, it is possible to carrying out reference voltage adjustment according to the concrete condition of M-bus bus and circuit characteristic demand, versatility is good；Adopting dedicated comparator to carry out the comparison of circuit voltage, power consumption is little, effectively prevents the damage of device.Accurately, failure rate is low, circuit is simple and reliable in this utility model detection.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of background technology.
Fig. 2 is functional block diagram of the present utility model.
Fig. 3 is the circuit theory diagrams of a kind of embodiment of the present utility model.
Detailed description of the invention
It is illustrated in figure 2 functional block diagram of the present utility model: this M-bus communication overload detection circuit that this utility model provides, including comparator, controller, reference voltage regulating circuit, current sampling circuit, filter circuit and protection circuit；The current signal of current sampling circuit sampling M-bus bus, is converted to voltage signal and is input to the input in the same direction of comparator；Standard voltage source is by the reverse input end of reference voltage regulating circuit output reference voltage to comparator；The outfan output M-bus overload detection signals of comparator is to controller；Filter circuit is serially connected between current sampling circuit and comparator, for filtering the interference signal in current sampling circuit output signal；Protection circuit is serially connected between filter circuit and comparator, for ensureing the properly functioning of circuit.
It is illustrated in figure 3 the circuit theory diagrams of a kind of embodiment of the present utility model: it is the current-limiting resistance of comparator reverse input end that reference voltage regulating circuit includes resistance R3 and R4, resistance R5；Resistance R1 is the current sampling resistor of M-bus bus, the current signal of the negative pole of M-bus bus is converted to voltage signal and is acquired；Electric capacity C1 and C2 is filter capacitor, and resistance R6 is pull down resistor, and TVS pipe V1 is protection device；Resistance R7 is the current-limiting resistance of comparator output terminal；C3 is the power filtering capacitor of comparator, and R2 is the current-limiting resistance of comparator input in the same direction.
Weight detector of the present utility model includes the reference voltage circuit of R3, R4, R5 composition, receive the reverse input end of comparator, the negative terminal of M-bus signal first passes through power-type current sampling resistor and pulls down to ground, again by ohmically voltage after C1 filters, being connected by one end of R2, the other end of R2 is connected to the input in the same direction of comparator, receives V1 diode and one end of C2 electric capacity simultaneously, and one end of R6 resistance, the other end ground connection of its three devices.The comparator power voltage supply by VCC, and connect C3 electric capacity be filtered process.The outfan of comparator, after R7 current limliting, is input to microcontroller, and controller judges current state, then goes to perform corresponding action.Described comparator adopts nanowatt power consumption to recommend output comparator.
The negative terminal mouth of M-bus bus, after R2 resistance, is connected with the input in the same direction of comparator.During work, when on M-bus line load capacity exceed preset a certain ultimate value current value time, load current on its M-bus first passes through current sampling resistor to ground, by gathering the voltage above current sampling resistor, after C1 capacitor filtering, by current-limiting resistance R2, it is connected to the positive input of comparator, this positive input is also associated with TVS pipe V1, filter capacitor C2, and pull down resistor R6 to ground.VCC voltage is through R3 and R4 electric resistance partial pressure, after R5 resistance, receives the reverse input end of comparator.Owing to load capacity exceedes a certain setting value, so the voltage of the now voltage high pressure reverse input end of positive input, comparator output high level.Now high level signal is transferred to controller through resistance R7, after controller receives the signal of overload, goes the operation performing to close respective channel.
When on M-bus line, load capacity is lower than a certain ultimate value, the positive input of comparator is lower than reverse input end, the output low level of comparator, and microcontroller, through judging, proceeds the copy reading datamation of this passage.
In this overload detector, comparator adopts nanowatt power consumption to recommend output comparator.
Resistance R3, R4 in this overload detector plays the effect of reference voltage dividing potential drop；Resistance R6 plays drop-down left and right, makes bus when not working, it is provided that stablize the effect of low-voltage, it is ensured that when not transshipping or do not connect load, makes comparator export reliable low level.
Claims (8)
1. a M-bus communication overload detection circuit, including comparator and controller, it is characterised in that also include reference voltage regulating circuit and current sampling circuit；The current signal of current sampling circuit sampling M-bus bus, is converted to voltage signal and is input to the input in the same direction of comparator；Standard voltage source is by the reverse input end of reference voltage regulating circuit output reference voltage to comparator；The outfan output M-bus overload detection signals of comparator is to controller.
2. M-bus communication overload detection circuit according to claim 1, it is characterised in that also including filter circuit, filter circuit is serially connected between current sampling circuit and comparator, for filtering the interference signal in current sampling circuit output signal.
3. M-bus communication overload detection circuit according to claim 1, it is characterised in that also including protection circuit, protection circuit is serially connected between current sampling circuit and comparator, for ensureing the properly functioning of circuit.
4. according to the M-bus communication overload detection circuit one of claim 1 ~ 3 Suo Shu, it is characterised in that described reference voltage regulating circuit is resistor voltage divider circuit.
5. according to the M-bus communication overload detection circuit one of claim 1 ~ 3 Suo Shu, it is characterised in that described current sampling circuit is sampling resistor.
6. M-bus communication overload detection circuit according to claim 2, it is characterised in that described filter circuit is capacitor filter.
7. M-bus communication overload detection circuit according to claim 3, it is characterised in that described protection circuit includes TVS pipe and pull down resistor.
8. according to the M-bus communication overload detection circuit one of claim 1 ~ 3 Suo Shu, it is characterised in that described comparator is for recommending output comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620043810.XU CN205374584U (en) | 2016-01-18 | 2016-01-18 | M -bus communication overload detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620043810.XU CN205374584U (en) | 2016-01-18 | 2016-01-18 | M -bus communication overload detection circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205374584U true CN205374584U (en) | 2016-07-06 |
Family
ID=56278822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620043810.XU Expired - Fee Related CN205374584U (en) | 2016-01-18 | 2016-01-18 | M -bus communication overload detection circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205374584U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283457A (en) * | 2018-11-16 | 2019-01-29 | 国网山东省电力公司电力科学研究院 | A kind of M-BUS communication interface electric property detection method |
| CN112272229A (en) * | 2020-10-23 | 2021-01-26 | 国网江苏省电力有限公司 | Embedded system-based remote meter reading method and system for underground well type water meter |
| CN112666489A (en) * | 2019-10-16 | 2021-04-16 | 重庆祺璨科技有限公司 | Early warning system for Mbus master station circuit |
| CN112748675A (en) * | 2019-10-16 | 2021-05-04 | 重庆禾瑞佳森物联网科技有限责任公司 | Singlechip system compatible with multiple slave machines |
| CN114070665A (en) * | 2021-11-09 | 2022-02-18 | 杭州海兴电力科技股份有限公司 | MBUS host communication circuit, method, device and medium thereof |
-
2016
- 2016-01-18 CN CN201620043810.XU patent/CN205374584U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283457A (en) * | 2018-11-16 | 2019-01-29 | 国网山东省电力公司电力科学研究院 | A kind of M-BUS communication interface electric property detection method |
| CN109283457B (en) * | 2018-11-16 | 2020-11-17 | 国网山东省电力公司电力科学研究院 | Method for detecting electrical performance of M-BUS communication interface |
| CN112666489A (en) * | 2019-10-16 | 2021-04-16 | 重庆祺璨科技有限公司 | Early warning system for Mbus master station circuit |
| CN112748675A (en) * | 2019-10-16 | 2021-05-04 | 重庆禾瑞佳森物联网科技有限责任公司 | Singlechip system compatible with multiple slave machines |
| CN112272229A (en) * | 2020-10-23 | 2021-01-26 | 国网江苏省电力有限公司 | Embedded system-based remote meter reading method and system for underground well type water meter |
| CN114070665A (en) * | 2021-11-09 | 2022-02-18 | 杭州海兴电力科技股份有限公司 | MBUS host communication circuit, method, device and medium thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205374584U (en) | M -bus communication overload detection circuitry | |
| CN205941678U (en) | Power battery current detection device based on shunt | |
| CN105774782B (en) | A kind of wheel speed transducing signal processing circuit and automobile ABS system | |
| CN102967748A (en) | DC bus voltage detection circuit with high antijamming capability | |
| CN203396920U (en) | Handheld alternating-current and direct-current circuit connection error monitoring and alarming device | |
| CN103389407A (en) | Mains supply detecting device | |
| CN205068033U (en) | Detection control circuit of water level perception device | |
| CN206209447U (en) | Remote signals Acquisition Circuit and the distribution terminal being made of the circuit | |
| CN205608084U (en) | Single -phase single line metering circuit | |
| CN203759112U (en) | High-frequency current detection circuit | |
| CN109890115A (en) | A kind of intelligent lighting control system and its flash control circuit | |
| CN104777436A (en) | Novel alternating current power supply monitoring device | |
| CN205049679U (en) | Residual current transformer sampling circuit | |
| CN103499771A (en) | Phase selection method for double-circuit transmission lines on the same pole | |
| CN207150845U (en) | A kind of band saturation voltage detection PTC control circuits | |
| CN104237612A (en) | Overcurrent detection circuit | |
| CN204633307U (en) | A kind of intelligent switch device with pulsating direct current residual current protecting | |
| CN104635055A (en) | Unbalanced bridge insulation measuring circuit of direct-current power supply | |
| CN204065874U (en) | A kind of temperature monitoring protection circuit based on PLC16887 | |
| CN203700002U (en) | Device capable of automatically regulating pH value of tap water | |
| CN209373387U (en) | Dynamic threshold detection circuit and concentrator | |
| CN208707363U (en) | Variable current voltage output system | |
| CN106655375A (en) | Wireless sensor power management system and method based on multi-stage and multi-path control | |
| CN105932766A (en) | Power supply circuit, single-phase single-line metering circuit, and metering method | |
| CN104836199A (en) | Intelligent switching device with pulsating direct current residual current protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Shi Yingchun Inventor after: Xiao Cheng Inventor after: Sun Xiaojin Inventor after: Yu Shufang Inventor after: Li Gangcheng Inventor after: Lei Daozhong Inventor after: Peng Hongjuan Inventor before: Shi Yingchun Inventor before: Xiao Cheng Inventor before: Sun Xiaojin Inventor before: Yu Shufen Inventor before: Li Gangcheng Inventor before: Lei Daozhong Inventor before: Peng Hongjuan |
|
| COR | Change of bibliographic data | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160706 Termination date: 20190118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |