CN107884666A - MBUS bus short circuits detect circuit and its detection method - Google Patents
MBUS bus short circuits detect circuit and its detection method Download PDFInfo
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- CN107884666A CN107884666A CN201711339776.6A CN201711339776A CN107884666A CN 107884666 A CN107884666 A CN 107884666A CN 201711339776 A CN201711339776 A CN 201711339776A CN 107884666 A CN107884666 A CN 107884666A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of MBUS bus short circuits to detect circuit, including the bus voltage detection circuit and bus state decision circuitry being sequentially connected in series；Voltage and output drive signal, bus state decision circuitry between the signal wire of bus voltage detection circuit judges MBUS buses export the short-circuit detecting consequential signal of MBUS buses according to drive signal.The invention also discloses the detection method of MBUS bus short circuits detection circuit.The present invention is according to the voltage difference relation between the signal wires of MBUS buses, the short-circuit detecting of MBUS buses by simple and reliable circuit realiration, can not only detect the short-circuit conditions of MBUS buses in real time, and circuit is simple and reliable.
Description
Technical field
Present invention relates particularly to a kind of MBUS bus short circuits detection circuit and its detection method.
Background technology
With the development and the improvement of people's living standards of national economy technology, bus communication technology has become industry
Essential means of communication in production and electric/electronic device.MBUS buses are widely used in the metering such as water meter, ammeter or gas meter
In instrument, the important function of data communication is carry, therefore the status monitoring of MBUS buses is just particularly important.
MBUS buses have three kinds of working conditions, respectively short-circuit, normal to go up electricity and do not power.According to national grid multilist collection
The requirement of technical specification is copied, the normal upper electricity of MBUS buses or non-power supply state are regarded as MBUS normal conditions, and MBUS is total
Line short-circuit condition then regards as abnormality, it is necessary to detect, find in time and handle.
At present, have more research for the technology of MBUS bus states monitoring, but do not find to there are can reliably,
Quickly it can simply detect the circuit that the short-circuit condition of MBUS buses is detected.
The content of the invention
An object of the present invention be to provide it is a kind of be capable of the short-circuit condition of quick detection MUBS buses, and simply may be used
The MBUS bus short circuits detection circuit leaned on.
The second object of the present invention is to provide a kind of detection method of the MBUS bus short circuits detection circuit.
This MBUS bus short circuits detection circuit provided by the invention, including the bus voltage detection circuit that is sequentially connected in series and
Bus state decision circuitry；The signal wire of the input connection MBUS buses of bus voltage detection circuit, bus voltage detection electricity
The input of the output end connection bus state decision circuitry on road；The output end output kind MBUS bus short circuits of bus decision circuitry
The consequential signal of detection；Voltage and output drive signal between the signal wire of bus voltage detection circuit judges MBUS buses are given
Bus state decision circuitry, bus state decision circuitry export the short-circuit detecting knot of MBUS buses according to the drive signal received
Fruit signal.
Described MBUS bus short circuits detection circuit also includes isolation circuit；Isolation circuit is connected to bus state and judges electricity
The output end on road, the signal for bus state decision circuitry to be exported are delivered to late-class circuit again after carrying out electrical isolation.
Described isolation circuit is optical coupling isolation circuit.
Described bus voltage detection circuit includes pull down resistor, first switch pipe, the first current-limiting resistance, input pull-up electricity
Resistance and output pull-up resistor；The positive pole circuit of MBUS buses connects positive source signal by inputting pull-up resistor, while also leads to
Cross the control terminal of the first current-limiting resistance connection first switch pipe, the negative pole of movable end one end connection MBUS buses of first switch pipe
Circuit, earth signal is also connected by pull down resistor；The movable end other end of first switch pipe is that bus voltage detects the defeated of circuit
Go out end, simultaneously also by output pull-up resistor connection positive source signal.
Described bus state decision circuitry includes second switch pipe, the second current-limiting resistance and the second output pull-up resistor；
The drive signal of bus voltage detection circuit output connects the control terminal of second switch pipe by the second current-limiting resistance；Second switch
The cathode traces of movable end one end connection MBUS buses of pipe, the movable end other end of second switch pipe judge electricity for bus state
Road, positive source signal is also connected by the second output pull-up resistor.
Described first switch pipe and second switch pipe are triode or metal-oxide-semiconductor.
Present invention also offers the detection method of MBUS bus short circuits detection circuit, comprise the following steps：
S1. the magnitude of voltage between two signal wires of bus voltage detection electric circuit inspection MBUS buses, and it is total according to MBUS
Magnitude of voltage output drive signal between two signal wires of line；
S2. the drive signal that bus state decision circuitry exports according to step S1, output bus condition adjudgement signal；
S3. bus state judges that signal detects circuit electrical with MBUS bus short circuits all the way by optical coupling isolation circuit output
The signal of isolation completes the short-circuit detecting of MBUS buses to late-class circuit.
This MBUS bus short circuits detection circuit provided by the invention and its detection method, according to the signal wire of MBUS buses
Between voltage difference relation, the short-circuit detecting of MBUS buses by simple and reliable circuit realiration, can not only examine in real time
The short-circuit conditions of MBUS buses are measured, and circuit is simple and reliable.
Brief description of the drawings
Fig. 1 is that the MBUS bus short circuits of the present invention detect the functional block diagram of circuit.
Fig. 2 is that the MBUS bus short circuits of the present invention detect the circuit diagram of circuit.
Fig. 3 is the method flow diagram that the MBUS bus short circuits of the present invention detect the detection method of circuit.
Embodiment
As shown in Figure 1 the functional block diagram of circuit is detected for the MBUS bus short circuits of the present invention：It is provided by the invention this
MBUS bus short circuits detect circuit, including bus voltage detection circuit, bus state decision circuitry and the isolation electricity being sequentially connected in series
Road；The signal wire of the input connection MBUS buses of bus voltage detection circuit, the output end connection of bus voltage detection circuit
The input of bus state decision circuitry；The result letter of the output end output kind MBUS bus short circuit detections of bus decision circuitry
Number；Voltage and output drive signal between the signal wire of bus voltage detection circuit judges MBUS buses judge to bus state
Circuit, bus state decision circuitry export the short-circuit detecting consequential signal of MBUS buses according to the drive signal received；Isolation
Be electrically connected to the output end of bus state decision circuitry, for the signal that exports bus state decision circuitry carry out electrically every
Late-class circuit is delivered to again from after, so as to ensure the safety of late-class circuit.
It is illustrated in figure 2 the circuit diagram of the MBUS bus short circuits detection circuit of the present invention：Bus voltage detects in figure
Circuit includes pull down resistor R8, first switch pipe V1, the first current-limiting resistance R3, input pull-up resistor R1, input protection diode
V3 and output pull-up resistor R2；Bus state decision circuitry includes second switch pipe V2, the second current-limiting resistance R4 and the second output
Pull-up resistor R5；Isolation circuit includes opto-coupler chip D1, optocoupler current-limiting resistance R6 and optocoupler output pull-up resistor R7.MBUS buses
Positive pole circuit MBUS+ by input protection diode V3 with input pull-up resistor R1 connect positive source signal V5P0_ISO,
Simultaneously also by the first current-limiting resistance R3 connection first switch pipes V1 control terminal (triode V1 base stage), first switch pipe
Movable end one end (triode V1 emitter stage) connects the negative pole circuit MBUS- of MBUS buses, is also connected by pull down resistor R8
Earth signal；The movable end other end (triode V1 colelctor electrode) of first switch pipe is the output end that bus voltage detects circuit,
Simultaneously also by output pull-up resistor R2 connection positive source signals V5P0_ISO；The driving letter of bus voltage detection circuit output
Number pass through the control terminals (triode V2 base stage) of the second current-limiting resistance R4 connection second switch pipes；The movable end of second switch pipe
One end (triode V2 emitter stage) connects the cathode traces of MBUS buses, the movable end other end (triode of second switch pipe
V2 colelctor electrode) be bus state decision circuitry output end, also pass through the second output pull-up resistor R5 connections positive sources letter
Number.
The course of work of foregoing circuit is as follows：
1) voltage between about 20~42V is had when MBUS buses normally work on power, between MBUS+ and MBUS-, this
Individual magnitude of voltage is loaded directly between the base stage of triode and colelctor electrode by resistance R3 so that triode V1 emitter stage and collection
Electrode conduction (now, diode V3 effect is one-way conduction, so as to ensure the high voltage on MBUS+ circuits may not flow into+
5V power supply signals end (V5P0_ISO)), now triode V1 collector voltage is pulled down resistance R8 and is pulled low to MBUS- circuits
Level, voltage difference is now had no between triode V2 base stage and colelctor electrode, now triode V2 emitter and collector is simultaneously
Do not turn on, now the pin of optocoupler 2 is equally pulled to high level by resistance R5, and now the luminous tube of optocoupler does not turn on yet, therefore light
The level signal OVER_LOAD signals of the output pin 4 of coupling are drawn high to high level by resistance R7, then MBUS bus short circuits now
The output signal for detecting circuit is high level.
2) when MBUS buses are not upper electric, now MBUS+ and MBUS- is without level signal；Now, triode V1 base stage
To be drawn high by resistance R1 and R3 to high level, triode V1 emitter stage is pulled low to low level by resistance R8, therefore triode V1
Emitter and collector can equally turn on, and voltage difference now be had no between triode V2 base stage and colelctor electrode, now triode
V2 emitter and collector does not turn on still, and now the pin of optocoupler 2 is equally pulled to high level by resistance R5, now the hair of optocoupler
Light pipe does not turn on yet, therefore the level signal OVER_LOAD signals of the output pin 4 of optocoupler draw high paramount electricity by resistance R7
Flat, then the output signal of MBUS bus short circuits detection circuit now is high level.
3) when MBUS bus short circuits, now short circuit between MBUS+ and MBUS-, now triode V1 base stage is by resistance
R8 is pulled low to low level, and triode V1 emitter stage is also pulled low to low level (the now base stage and current collection of triode by resistance R8
Extremely directly it is shorted together), now triode V1 emitter and collector does not turn on；Therefore, triode V2 base stage quilt
Resistance R2 and R4 are drawn high to high level, and triode V2 emitter stage is pulled low to low level by resistance R8, now triode V2
Emitter and collector turns on, and now, 2 pin of optocoupler are pulled low to low level by resistance R8,1 pin of optocoupler by resistance R6 draw high to
High level, now the luminous tube conducting of optocoupler is luminous, therefore the pin of reception pipe 3 of optocoupler and the conducting of 4 pin, therefore MBUS bus short circuits
Detect circuit output signal OVER_LOAD directly with ground short circuit, therefore MBUS bus short circuits detection circuit output signal
OVER_LOAD is low level.
In summary, it is only necessary to the output signal OVER_LOAD of circuit level state is detected according to MBUS bus short circuits
It can determine whether MBUS buses are short-circuit；As long as the output signal OVER_LOAD signals of MBUS bus short circuits detection circuit are low
Level signal, then it is short-circuit condition to show MBUS buses.
It is illustrated in figure 3 the method flow diagram of the detection method of the MBUS bus short circuits detection circuit of the present invention：The present invention
The detection method of the MBUS bus short circuits detection circuit is additionally provided, is comprised the following steps：
S1. the magnitude of voltage between two signal wires of bus voltage detection electric circuit inspection MBUS buses, and it is total according to MBUS
Magnitude of voltage output drive signal between two signal wires of line；
S2. the drive signal that bus state decision circuitry exports according to step S1, output bus condition adjudgement signal；
S3. bus state judges that signal detects circuit electrical with MBUS bus short circuits all the way by optical coupling isolation circuit output
The signal of isolation completes the short-circuit detecting of MBUS buses to late-class circuit.
Claims (7)
1. a kind of MBUS bus short circuits detect circuit, it is characterised in that including the bus voltage detection circuit being sequentially connected in series and bus
Status determination circuit；The signal wire of the input connection MBUS buses of bus voltage detection circuit, bus voltage detection circuit
Output end connects the input of bus state decision circuitry；The output end output kind MBUS bus short circuit detections of bus decision circuitry
Consequential signal；Voltage and output drive signal between the signal wire of bus voltage detection circuit judges MBUS buses is to bus
Status determination circuit, the short-circuit detecting result that bus state decision circuitry exports MBUS buses according to the drive signal received are believed
Number.
2. MBUS bus short circuits according to claim 1 detect circuit, it is characterised in that also including isolation circuit；Isolation electricity
Road is connected to the output end of bus state decision circuitry, and the signal for bus state decision circuitry to be exported carries out electrical isolation
It is delivered to late-class circuit again afterwards.
3. MBUS bus short circuits according to claim 2 detect circuit, it is characterised in that described isolation circuit is optocoupler
Isolation circuit.
4. the MBUS bus short circuits detection circuit according to one of claims 1 to 3, it is characterised in that described bus voltage
Detecting circuit includes pull down resistor, first switch pipe, the first current-limiting resistance, input pull-up resistor and output pull-up resistor；MBUS
The positive pole circuit of bus connects positive source signal by inputting pull-up resistor, and first is connected simultaneously also by the first current-limiting resistance
The control terminal of switching tube, the negative pole circuit of movable end one end connection MBUS buses of first switch pipe, is also connected by pull down resistor
Ground signalling；The movable end other end of first switch pipe is the output end that bus voltage detects circuit, simultaneously also by output
Pull-up resistor connects positive source signal.
5. MBUS bus short circuits according to claim 4 detect circuit, it is characterised in that described bus state judges electricity
Road includes second switch pipe, the second current-limiting resistance and the second output pull-up resistor；The driving letter of bus voltage detection circuit output
Number by the second current-limiting resistance connect second switch pipe control terminal；Movable end one end connection MBUS buses of second switch pipe
Cathode traces, the movable end other end of second switch pipe is bus state decision circuitry, is also connected by the second output pull-up resistor
Connect positive source signal.
6. MBUS bus short circuits according to claim 5 detect circuit, it is characterised in that described first switch pipe and the
Two switching tubes are triode or metal-oxide-semiconductor.
7. the detection method of the MBUS bus short circuits detection circuit described in a kind of one of claim 1~6, it is characterised in that including
Following steps：
S1. the magnitude of voltage between two signal wires of bus voltage detection electric circuit inspection MBUS buses, and according to MBUS buses
Magnitude of voltage output drive signal between two signal wires；
S2. the drive signal that bus state decision circuitry exports according to step S1, output bus condition adjudgement signal；
S3. bus state judges that signal detects circuit electrical with MBUS bus short circuits all the way by optical coupling isolation circuit output and isolated
Signal to late-class circuit, complete the short-circuit detecting of MBUS buses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711339776.6A CN107884666A (en) | 2017-12-14 | 2017-12-14 | MBUS bus short circuits detect circuit and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711339776.6A CN107884666A (en) | 2017-12-14 | 2017-12-14 | MBUS bus short circuits detect circuit and its detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107884666A true CN107884666A (en) | 2018-04-06 |
Family
ID=61774530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711339776.6A Pending CN107884666A (en) | 2017-12-14 | 2017-12-14 | MBUS bus short circuits detect circuit and its detection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN107884666A (en) |
Cited By (2)
| 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 method for detecting electrical performance of M-BUS communication interface |
| CN111830432A (en) * | 2019-03-26 | 2020-10-27 | 比亚迪股份有限公司 | Anti-dismantling animal monitoring device and anti-dismantling method thereof |
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| DE19929641A1 (en) * | 1999-06-28 | 2001-01-11 | Phoenix Contact Gmbh & Co | Circuit for switching on and operating devices connected in series with regard to their supply voltage in a control and data transmission system |
| CN201430584Y (en) * | 2009-07-06 | 2010-03-24 | 中国电力科学研究院 | Anti-crash isolation device used in bus communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 method for detecting electrical performance of M-BUS communication interface |
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| CN111830432A (en) * | 2019-03-26 | 2020-10-27 | 比亚迪股份有限公司 | Anti-dismantling animal monitoring device and anti-dismantling method thereof |
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Application publication date: 20180406 |