CN106301471A - A kind of amplitude adjustable MBP signal generating circuit for test - Google Patents
A kind of amplitude adjustable MBP signal generating circuit for test Download PDFInfo
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- CN106301471A CN106301471A CN201510361960.5A CN201510361960A CN106301471A CN 106301471 A CN106301471 A CN 106301471A CN 201510361960 A CN201510361960 A CN 201510361960A CN 106301471 A CN106301471 A CN 106301471A
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Abstract
The invention discloses a kind of adjustable MBP of amplitude (Manchester Bus powered for test, this special coding of bus-powered graceful side) signal generating circuit, this signal generating circuit supports the use with waveform generator, waveform generator output and the square-wave signal of MBP signal same frequency (31.25kbps), produce the MBP signal of standard after the isolation of signal generating circuit, power amplifier, modulation.This signal generating circuit can be by regulating the voltage magnitude of signal generator output signal, the corresponding amplitude adjusting MBP signal.This signal generating circuit reliability is high, low price, and the communication sensitivity that can be used for testing field bus device based on MBP signal is tested it can also be used to build the MBP transceiver of non-dedicated chip.
Description
Technical field
The invention belongs to industrial flow and control category, be based particularly on the industry stream of PROFIBUS/PA and FF field bus protocol
Process control technology category.
Background technology
MBP (Manchester Bus powered) is bus-powered Manchester's code.Manchester's code (Manchester
Encoding), being also phase code (PE), be a kind of data synchronization transmissions pattern, in Manchester's code, the centre of each has
One saltus step, clock signal, again date number had both been made in the saltus step in the middle of position.Bus-powered Manchester's code, will use Man Chesi
The signal of communication of special coding is superimposed upon on direct current supply voltage, it is achieved be power supply to the device in couple of conductor, the most also transmission communication letter
Number.MBP transmission technology is mainly used in process industry fieldbus, such as PROFIBUS PA, FF etc..
MBP transmission technology is generally realized by private communication transponder chip, such as the SIM2 of Siemens.But use private communication to receive
Sending out device chip, the parameter such as the amplitude of output signal cannot be carried out regulation, (requires to regulate signal voltage for communication sensitivity test
To minimum, require signal voltage to be 160mV such as PROFIBUS PA) cannot realize, and the valency of private communication transponder chip
Lattice are higher.
Summary of the invention
A kind of for test amplitude adjustable MBP signal generating circuit, comprising: power module (1), signal isolation module (2),
Signal generating module (3), signal amplify and modulation module (4), and wherein, the power supply of described power module (1) is from possessing bus
The fieldbus of supplied character, in described signal isolation module (2), the signal of waveform generator (5) exports as optocoupler mould
The input control signal of block, and make it have anti-reverse function by connecting diode, in described signal generating module (3),
S1, S2 are expressed as positive square-wave signal source, when the positive electricity of the square-wave signal meeting Manchester's code that waveform generator (5) exports
During ordinary mail, S2 exports square-wave signal, S1 non-output signal；Manchester's code is met when what waveform generator (5) exported
During the negative level signal of square-wave signal, S2 is without output, and S1 export square-wave signal, amplifies and modulation module (4) at described signal
In, signal end is connected with resistance R7, and the R7 other end is connected with electric capacity C2 and resistance R8, the R8 other end and electric capacity C3 and computing
The in-phase input end of amplifier U1 is connected, and one section of the output of U1 and resistance R9 is connected, the other end of resistance R9 and audion
The base stage of Q4 is connected, and the colelctor electrode of Q4 is connected with resistance R10 and adjustable resistance RP2, and Q4 emitter stage is connected with bus anode.
For realizing the field bus device transmitted based on MBP realizes related communication test, and realize non-dedicated communication chip
MBP data are transmitted, and it is an object of the invention to provide that a kind of reliability is high, cheap, can effectively adjust physical signalling
Whole MBP signal generating circuit, it is possible to implement function such as:
(1) can produce and meet the MBP signal of associated field bussing technique requirement；
(2) input of MBP signal generating circuit is same frequency square-wave signal, can realize believing MBP by the voltage magnitude of regulation square-wave signal
Number there is the regulation of output MBP signal voltage amplitude of circuit；
(3) by adjusting the slide rheostat of MBP signal generating circuit, can be to the output MBP signal voltage width of MBP signal generating circuit
The regulation of value；
(4) by adjusting the slide rheostat of MBP signal generating circuit, MBP signal generating circuit can be exported MBP signal voltage
Symmetry is adjusted；
(5) the input isolation of MBP signal generating circuit.
Present invention employs a kind of amplitude adjustable MBP signal generating circuit for test, comprising: power module (1), letter
Number isolation module (2), signal generating module (3), signal amplify and modulation module (4).
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of the amplitude adjustable MBP signal generating circuit for test；
Fig. 2 shows the circuit diagram of signal isolation module (2)；
Fig. 3 shows that signal amplifies the circuit diagram with modulation module (4).
Detailed description of the invention
To achieve these goals, present invention employs a kind of amplitude adjustable MBP signal for test and electricity occurs
Road, comprising: power module (1), signal isolation module (2), signal generating module (3), signal amplify and modulation
Module (4).Wherein:
In power module (1), power module (1) power supply from possess bus-powered characteristic fieldbus (such as: FF,
PROFIBUS PA etc.), the positive and negative terminal of bus connects the input of three-terminal voltage-stabilizing chip, and power supply input is in addition to providing DC voltage
Also it is superimposed with digital signal, is that whole MBP signal generating circuit exports galvanic current through three-terminal voltage-stabilizing chip and filter capacitor
Pressure.
In signal isolation module (2), the signal of waveform generator (5) exports the input control signal as optical coupling module, and
Anti-reverse function is made it have by connecting diode.Optical coupling module should possess the amplification region of certain adjustable extent so that waveform is sent out
The signal amplitude size of raw device (5) is amplified can produce impact to the amplitude of final output signal.Waveform generator (5) exports
Signal is the square-wave signal meeting Manchester's code.Optical coupling module supports 2 tunnel outputs, by the positive half-wave of waveform generator (5)
With negative half-wave voltage signal, control 2 tunnel outputs of optical coupling module respectively.
In signal generating module (3), S1, S2 are expressed as positive square-wave signal source, when meeting that waveform generator (5) exports
During the positive level signal of the square-wave signal of Manchester's code, S2 exports square-wave signal, S1 non-output signal；Work as waveform generator
(5), during the negative level signal of the square-wave signal meeting Manchester's code exported, S2 is without output, and S1 exports square-wave signal.
The output of S2 is connected with the base stage of audion Q1, audion Q1 conducting when S2 exports square-wave signal, and audion Q2 and Q3 ends.
The colelctor electrode of audion Q1 is connected with resistance R3 one end.Audion Q2, Q3 conducting, audion Q1 when S1 exports square-wave signal
Cut-off.The colelctor electrode of audion Q2 is connected with resistance R1 one end, the other end of resistance R1 and the base stage of audion Q3 and resistance
R2 one end is connected.Audion Q3 colelctor electrode is connected with one end of resistance R4.One end of resistance R3 and R4 all with variable resistance RP1
It is connected.The periodicity conducting of audion Q1, Q2 and Q3, causes the sense of current flowing through RP1 to change, correspondingly makes
The level of outfan changes.Power supply VCC is connected with resistance R5 and electric capacity C1, and VCC, R5, R6 and C1 constitute dividing potential drop electricity
Road.The square-wave signal being superimposed upon on DC voltage can be formed.By regulation variable resistance RP1, can be to the amplitude of signal and right
Title property is finely adjusted.
Amplifying with modulation module (4) at signal, signal end is connected with resistance R7, the R7 other end and electric capacity C2 and resistance R8
It is connected.The resistance R8 other end is connected with the in-phase input end of electric capacity C3 and operational amplifier U1.The output of operational amplifier U1
Being connected with one section of resistance R9, the other end of resistance R9 is connected with the base stage of audion Q4, the colelctor electrode of audion Q4 and electricity
Resistance R10 is connected with adjustable resistance RP2, and audion Q4 emitter stage is connected with bus anode.Variable-resistance sliding end is put with computing
The inverting input of big device U1 is connected.Operational amplifier U1, audion Q4 and resistance R7, R8, R9, R10, RP2 are constituted
Negative feedback amplifier circuit, is amplified signal, and completes signal modulate by being connected to the audion Q4 of bus, end form
Become MBP signal.The amplitude of MBP signal can be adjusted by adjustable resistance RP2, and is finely adjusted signal symmetry.
The invention have the advantages that and good effect: by signal generating module (3), amplitude and the symmetry of MBP signal can be carried out
Adjust, solve and cannot effectively adjust amplitude and symmetric problem based on existing chip, can realize carrying out sensitive to bus apparatus
The communication performance tests such as degree.And this circuit can become the transmission circuit of the fieldbus using MBP signal, mirror through simple modification
In using discrete component to build, comparing special transponder chip, price advantage is obvious.
Claims (6)
1. for an amplitude adjustable MBP signal generating circuit for test, comprising: power module (1), signal isolation module
(2), signal generating module (3), signal amplify with modulation module (4), wherein, the power supply of described power module (1) from
Possessing the fieldbus of bus-powered characteristic, in described signal isolation module (2), the signal output of waveform generator (5) is made
For the input control signal of optical coupling module, and make it have anti-reverse function, in described signal generating module by connecting diode
(3) in, S1, S2 are expressed as positive square-wave signal source, when the square wave letter meeting Manchester's code that waveform generator (5) exports
Number positive level signal time, S2 exports square-wave signal, S1 non-output signal；Man Chesi is met when what waveform generator (5) exported
During the negative level signal of the square-wave signal of special coding, S2 is without output, and S1 export square-wave signal, amplifies at described signal and modulates mould
In block (4), signal end is connected with resistance R7, and the R7 other end is connected with electric capacity C2 and resistance R8, the R8 other end and electric capacity
C3 is connected with the in-phase input end of operational amplifier U1, and one section of the output of U1 and resistance R9 is connected, the other end of resistance R9
Being connected with the base stage of audion Q4, the colelctor electrode of Q4 is connected with resistance R10 and adjustable resistance RP2, and Q4 emitter stage is with bus just
End is connected.
2. signal generating circuit as claimed in claim 1, it is characterised in that described fieldbus is FF, PROFIBUS PA
One in bus.
3. signal generating circuit as claimed in claim 2, it is characterised in that in described power module (1), bus is just
Negative terminal connects the input of three-terminal voltage-stabilizing chip, and power supply input is also superimposed with digital signal in addition to providing DC voltage, steady through three ends
Pressure chip and filter capacitor are that whole MBP signal generating circuit exports galvanic current pressure.
4. signal generating circuit as claimed in claim 3, it is characterised in that in described signal isolation module (2), optocoupler
Module should possess the amplification region of certain adjustable extent so that the signal amplitude size of waveform generator (5) is amplified can be to the most defeated
The amplitude going out signal produces impact, and the signal that waveform generator (5) exports is the square-wave signal meeting Manchester's code, optocoupler mould
Block supports 2 tunnel outputs, by positive half-wave and the negative half-wave voltage signal of waveform generator (5), controls 2 tunnel outputs of optical coupling module respectively.
5. signal generating circuit as claimed in claim 4, it is characterised in that in described signal generating module (3),
The colelctor electrode of described Q1 is connected with resistance R3 one end, and audion Q2, Q3 conducting when S1 exports square-wave signal, audion Q1 cuts
Only, the colelctor electrode of Q2 is connected with resistance R1 one end, the base stage of the other end of resistance R1 and audion Q3 and resistance R2 one end phase
Even, audion Q3 colelctor electrode is connected with one end of resistance R4, and one end of resistance R3 with R4 is all connected with variable resistance RP1,
The periodicity conducting of audion Q1, Q2 and Q3, causes the sense of current flowing through RP1 to change, correspondingly makes outfan
Level change, power supply VCC is connected with resistance R5 and electric capacity C1, and VCC, R5, R6 and C1 constitute bleeder circuit, can
Formed and be superimposed upon the square-wave signal on DC voltage, by regulation variable resistance RP1, the amplitude of signal and symmetry can be entered
Row fine setting.
6. signal generating circuit as claimed in claim 5, it is characterised in that amplify and in modulation module (4) at described signal,
Variable-resistance sliding end is connected with the inverting input of operational amplifier U1, operational amplifier U1, audion Q4 and resistance R7,
R8, R9, R10, RP2 constitute negative feedback amplifier circuit, are amplified signal, and complete by being connected to the Q4 of bus
Signal is modulated, and ultimately forms MBP signal, and the amplitude of MBP signal can be adjusted by adjustable resistance RP2, and to signal symmetry
Property is finely adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510361960.5A CN106301471A (en) | 2015-06-25 | 2015-06-25 | A kind of amplitude adjustable MBP signal generating circuit for test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510361960.5A CN106301471A (en) | 2015-06-25 | 2015-06-25 | A kind of amplitude adjustable MBP signal generating circuit for test |
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| Publication Number | Publication Date |
|---|---|
| CN106301471A true CN106301471A (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510361960.5A Pending CN106301471A (en) | 2015-06-25 | 2015-06-25 | A kind of amplitude adjustable MBP signal generating circuit for test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857666A (en) * | 2021-01-19 | 2021-05-28 | 安徽络嵌控制系统有限公司 | Touch-control pressure transmitter debugger |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001024718A (en) * | 1999-07-09 | 2001-01-26 | Oki Electric Ind Co Ltd | Modulator, decoder and receiver |
| CN202004735U (en) * | 2010-12-15 | 2011-10-05 | 北京天源科创风电技术有限责任公司 | Signal simulator of generator of wind generating set |
| CN103001705A (en) * | 2011-09-13 | 2013-03-27 | 上海华虹Nec电子有限公司 | Generation system and generation method for near field communication transceiver chip test waves |
| CN103698563A (en) * | 2013-12-25 | 2014-04-02 | 北京航天测控技术有限公司 | 1553B bus electrical fault injection device |
-
2015
- 2015-06-25 CN CN201510361960.5A patent/CN106301471A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001024718A (en) * | 1999-07-09 | 2001-01-26 | Oki Electric Ind Co Ltd | Modulator, decoder and receiver |
| CN202004735U (en) * | 2010-12-15 | 2011-10-05 | 北京天源科创风电技术有限责任公司 | Signal simulator of generator of wind generating set |
| CN103001705A (en) * | 2011-09-13 | 2013-03-27 | 上海华虹Nec电子有限公司 | Generation system and generation method for near field communication transceiver chip test waves |
| CN103698563A (en) * | 2013-12-25 | 2014-04-02 | 北京航天测控技术有限公司 | 1553B bus electrical fault injection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857666A (en) * | 2021-01-19 | 2021-05-28 | 安徽络嵌控制系统有限公司 | Touch-control pressure transmitter debugger |
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Application publication date: 20170104 |