CN206223801U - It is applied to the fully differential signal conditioning circuit of current excitation sensor - Google Patents
It is applied to the fully differential signal conditioning circuit of current excitation sensor Download PDFInfo
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- CN206223801U CN206223801U CN201620719417.8U CN201620719417U CN206223801U CN 206223801 U CN206223801 U CN 206223801U CN 201620719417 U CN201620719417 U CN 201620719417U CN 206223801 U CN206223801 U CN 206223801U
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Abstract
The utility model is related to sensor detection field, particularly a kind of fully differential signal conditioning circuit for being applied to current excitation sensor, including the signal receiving unit, programmable-gain unit, anti-aliasing filter unit and the AD conversion unit that are sequentially connected, the signal receiving unit, for being exported after the output signal and isolated DC component that receive the sensor；The programmable-gain unit, for the AC signal for exporting the signal receiving unit, is exported after amplified or diminution with differential signal；The anti-aliasing filter unit, exported with differential signal after high-frequency interferencing signal for filtering；The AD conversion unit, the differential signal for receiving is converted to data signal output.The utility model overall signal stream is all using fully differential mode, any part can effectively be suppressed by noise jamming on signal transmission path, and immunity to interference to external noise can be increased, so as to dynamic range be doubled, and reduce even-order harmonic.
Description
Technical field
The utility model is related to sensor detection field, particularly a kind of fully differential letter for being applied to current excitation sensor
Number modulate circuit.
Background technology
Sensor is a kind of accurate sensing equipment for being widely used in various control fields, such as in field of aircraft,
Because aero-engine intermediary base bearing failure is protruded, flight safety is influenceed, it is therefore desirable to which a kind of reliability, robustness are high, and
The accurate health management device for sending early warning signal within enough lead time.
At present, in the bearing failure diagnosis of some aero-engines, mostly using the inspection of ICP or IEPE acceleration transducers
The vibration signal of bearing is surveyed, wherein, ICP sensors (integrated circuits piezoelectric) refer to built-in
Piezoelectric transducer, be placed in traditional charge amplifier in sensor using modern integrated circuits technology by it, all high impedance electricity
Road is all sealed in sensor, and is exported in low-impedance voltage mode, and output voltage amplitude is directly proportional to acceleration.IEPE is sensed
Device (Integral Electronic Piezoelectric) refers to a kind of acceleration from carried charge amplifier or voltage amplifier
Degree sensor.
No matter the electricity produced with which kind of sensor is very little, therefore the electric signal that sensor is produced is highly susceptible to make an uproar
Acoustic jamming, and the transmission path of signal is considerably complicated, and the vibration signal of intershaft bearing will also in addition to will be by oil-film damping
Sensor is transferred to through the casing of long-distance, the output signal of sensor will could also be arrived through the transmission of long-distance multipath
Up to collection receiver, along with interference strongly in transmitting procedure so that signal quality is substantially reduced, and useful bearing
Fault-signal is often submerged in the signals such as noise the inside, the prominent difficult point as fault diagnosis.To improve the quality of signal, need
The interference of noise is effectively removed, the signal that sensor is exported is carried out using single-ended treatment technology generally in existing technology
Treatment, because single-ended treatment technology can not suppress ground noise, the noise accumulated in operational amplifier can reduce signal to noise ratio (SNR)
Performance, so as to influence system design.Even if the differential signal modulate circuit built using double operational, due to needing more capacitance-resistances
Device so that design complicates, and error and the error of chip internal due to external resistor-capacitor device, it is difficult to accomplish to put down completely
Weighing apparatus.
Utility model content
The utility model overcomes disadvantages mentioned above, there is provided a kind of electric current that is applied to that can effectively suppress noise jamming swashs
Encourage the fully differential signal conditioning circuit of sensor.
The technical scheme in the invention for solving the technical problem is：A kind of current excitation sensor of being applied to
Fully differential signal conditioning circuit, the sensor has two output ends, respectively signal output part and reference output, described
Fully differential signal conditioning circuit include be sequentially connected signal receiving unit, programmable-gain unit, anti-aliasing filter unit and
AD conversion unit,
The signal receiving unit, for receiving the signal that two output ends of the sensor are transmitted, and isolated DC point
AC signal is exported after amount；
The programmable-gain unit, for the AC signal for exporting the signal receiving unit, amplified or diminution
Exported with differential signal afterwards；
The anti-aliasing filter unit, the signal for receiving the programmable-gain unit output, filters High-frequency Interference
Exported with differential signal after signal；
The AD conversion unit, for receiving the differential signal of the anti-aliasing filter unit output, and is converted to number
Word signal output.
The signal receiving unit may include a resistance to earth, for by the reference output and signal of the sensor
The signal of output end output is superimposed common-mode voltage simultaneously, for the instrument amplifier of programmable-gain unit provides condition of work, institute
One end ground connection of resistance to earth is stated, the other end is connected to the reference output of the sensor.
The signal receiving unit may also include a coupled capacitor, and the coupled capacitor is connected on the one of the sensor
On path between individual output end and an input of the programmable-gain unit.
The coupled capacitor can have two, and two output ends of the sensor and the programmable increasing are connected on respectively
On two paths between two inputs of beneficial unit.
The programmable-gain unit can use instrument amplifier.
The anti-aliasing filter unit can be using the Butterworth low pass being made up of two 2 rank multiple feedback filter circuits
Ripple device.
The utility model overall signal stream uses Differential Input using fully differential mode, i.e. each unit, difference output
Mode is processed and transmitted to signal, therefore can effectively be suppressed by noise jamming in any part.Adopt
The fully differential modulate circuit provided with the utility model, by increasing capacitance it is possible to increase to the immunity to interference of external noise, so as to dynamic range be added
Times, and reduce even-order harmonic.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is the circuit theory diagrams of acceleration transducer and signal receiving unit in the utility model；
Fig. 3 is the circuit theory diagrams of programmable-gain unit in the utility model；
Fig. 4 is first circuit theory diagrams of 2 rank multiple feedback wave filters in anti-aliasing filter unit in the utility model；
Fig. 5 is the circuit theory diagrams of AD conversion unit described in the utility model.
Specific embodiment
A kind of claimed fully differential signal conditioning circuit of the utility model, can apply to conditioning ICP or IEPE etc.
The output signal of acceleration transducer, it is also possible to need the output signal of current excitation sensor for nursing one's health other, such as
RTD temperature sensor.As shown in fig. 1, it is theory diagram of the present utility model, the acceleration transducer is with two outputs
End, respectively signal output part and reference output, the utility model include the signal receiving unit, the programmable increasing that are sequentially connected
Beneficial unit, anti-aliasing filter unit and AD conversion unit.
The signal receiving unit, for receiving the signal that two output ends of the acceleration transducer are transmitted, and isolates
AC signal is exported after DC component；
The programmable-gain unit, for the AC signal for exporting the signal receiving unit, amplified or diminution
Exported with differential signal afterwards；
The anti-aliasing filter unit, the signal for receiving the programmable-gain unit output, filters High-frequency Interference
Exported with differential signal after signal；
The AD conversion unit, for receiving the differential signal of the anti-aliasing filter unit output, and is converted to number
Word signal output.
Fig. 2 is the circuit theory diagrams of acceleration transducer and signal receiving unit in the utility model, and the signal is received
Unit includes resistance to earth R18 and coupled capacitor C19.By taking ICP sensors as an example, it has two to the acceleration transducer J1
Output end, respectively signal output part and reference output, one end ground connection of the resistance to earth R18, the other end are connected to institute
The reference output of acceleration transducer J1 is stated, the excitation current source of 4mA, excitation electricity are needed due to the acceleration transducer J1
Stream forms common mode voltage signal by resistance R18.
If the reference output of acceleration transducer J1 be directly grounded, the noise signal of reference output can be by the earth
Absorb, like this because earth signal is 0V constant, and signal output part useful signal and noise signal enter compiling below
To be all exaggerated after journey gain unit, therefore, it is grounded by one end of resistance R18, the other end is connected to the acceleration sensing
The reference output of device so that the signal that the signal of reference output output is exported with signal output part multiplies while being superimposed R18
With the common mode voltage signal of 4mA, for the treatment of rear class instrument amplifier provides necessary condition, this common-mode voltage is finally by programmable increasing
Beneficial unit effectively suppresses.
The signal receiving unit also includes that coupled capacitor C19, the coupled capacitor C19 are connected on the connection acceleration
On signal path between the signal output part of sensor J1 and the input of programmable-gain unit.Due to acceleration transducer
The output signal of J1 is superimposed upon on DC voltage, and DC component, the friendship for being needed are removed by the coupled capacitor C19
Stream signal.In addition it is also possible to two output ends in the acceleration transducer J1 all set coupled capacitor, will two couplings
Electric capacity, is connected between two output ends of the acceleration transducer J1 and two inputs of programmable-gain unit respectively
Two paths on (do not indicated in figure), it is also possible to preferably removal two paths on DC component.
Fig. 3 is the circuit theory diagrams of programmable-gain unit in the utility model, and the programmable-gain unit is employed
Instrument amplifier U7, can zoom in or out the AC signal of input to the range ability of the AD conversion unit, will
Signal receiving unit output through instrument amplifier U7 described in the signal input after overcoupling, the programmable instrumentation amplifies
The front end of device U7 constitutes passive RC low pass filters by resistance R1, R2, electric capacity C1, C2, the two-way letter that sensor J1 is transmitted
After number filtering off High-frequency Interference, control I/O pin to zoom in or out by the gain of programmable instrumentation amplifier U7, due to from
The signal of sensor J1 outputs will get to signal receiving unit through the transmission of long-distance, the noise signal in transmission path
Can act on simultaneously on two output signal lines of connection sensor J1 signal output parts and reference output, because instrument is amplified
Device U7 has very strong inhibitory action (being provided more than 110dB in wide frequency range) such that noise signal influences on output on common-mode signal
It is preferably minimized, programmable instrumentation amplifier is except with amplifying deamplification, zero shift, high input impedance, extremely low 1/f noise etc.
Outside characteristic, fully differential, rail-to-rail output are additionally provided.Fully differential conditioning so to whole link provides necessary bar
Part.
The anti-aliasing filter unit uses the Butterworth LPF being made up of two 2 rank multiple feedbacks.Such as Fig. 4
Shown in, it is first circuit theory diagrams of 2 rank multiple feedback wave filters, it is by Full differential operational amplifier U2 and resistance R27
~R32 feedback capacities C23~C25 is constituted, and the cut-off frequency suitable precision resister electric capacity of selection as needed, described two
Individual 2 rank multiple feedback filter construction is identical (being omitted in figure), and is linked in sequence, and constitutes Butterworth LPF, and its is defeated
It is still two-way fully differential signal to go out, so that the high-frequency interferencing signal there may be aliasing is effectively suppressed.
The AD conversion unit as shown in Figure 5, mainly by the analog-digital converter U11 with fully differential analog input end
Constitute, by the two-way fully differential signal that the anti-aliasing filter unit is exported, be linked into the fully differential mould of analog-digital converter U11
Intend input, after being converted to data signal, exported in the form of number bus SPI, the digital data transmission that it is exported to CPU
In, more signal transactings etc. are carried out by CPU and is operated.Because analog-digital converter U11 is using the 2.5V voltages of outside superhigh precision
Benchmark, in order to obtain bigger dynamic range, can be by the fully differential computing of programmable-gain unit and anti-aliasing filter unit
Common-mode voltage (OCM) port unification of amplifier is connected on the benchmark of 2.5V.
It can be seen from foregoing description, the utility model overall signal stream is all adopted using fully differential mode, i.e. each unit
With Differential Input, the mode of difference output is processed and transmitted to signal, can by noise jamming in any part
Effectively suppressed.The fully differential modulate circuit provided using the utility model, by increasing capacitance it is possible to increase to the immunity to interference of external noise,
So as to dynamic range be doubled, and even-order harmonic is reduced, if be applied in aero-engine, can timely and effectively from making an uproar
The fault-signal of intermediary's base bearing is detected in acoustical signal, so as to timely be safeguarded, it is to avoid the generation of more major break down, therefore
Maintenance and support expense can be significantly reduced, operational readiness rate and Mission Success rate is improved.
The fully differential signal conditioning circuit for being applied to current excitation sensor provided by the utility model is carried out above
It is discussed in detail, specific case used herein is set forth to principle of the present utility model and implementation method, above reality
The explanation for applying example is only intended to help and understands method of the present utility model and its core concept；Simultaneously for the general of this area
Technical staff, according to thought of the present utility model, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as to limitation of the present utility model.
Claims (6)
1. a kind of fully differential signal conditioning circuit for being applied to current excitation sensor, the sensor has two output ends,
Respectively signal output part and reference output, it is characterised in that：The fully differential signal conditioning circuit includes what is be sequentially connected
Signal receiving unit, programmable-gain unit, anti-aliasing filter unit and AD conversion unit,
The signal receiving unit, for receiving the signal that two output ends of the sensor are transmitted, and after isolated DC component
Output AC signal；
The programmable-gain unit, for the AC signal for exporting the signal receiving unit, it is amplified or after reducing with
Differential signal is exported；
The anti-aliasing filter unit, the signal for receiving the programmable-gain unit output, filters high-frequency interferencing signal
Exported with differential signal afterwards；
The AD conversion unit, for receiving the differential signal of the anti-aliasing filter unit output, and is converted to digital letter
Number output.
2. the fully differential signal conditioning circuit for being applied to current excitation sensor according to claim 1, it is characterised in that：
The signal receiving unit includes a resistance to earth, for the reference output of the sensor and signal output part to be exported
Signal be superimposed common-mode voltage simultaneously, one end ground connection of the resistance to earth, the benchmark that the other end is connected to the sensor is defeated
Go out end.
3. the fully differential signal conditioning circuit for being applied to current excitation sensor according to claim 2, it is characterised in that：
The signal receiving unit also includes a coupled capacitor, the coupled capacitor be connected on an output end of the sensor with
On path between one input of the programmable-gain unit.
4. the fully differential signal conditioning circuit for being applied to current excitation sensor according to claim 3, it is characterised in that：
The coupled capacitor has two, and two of two output ends of the sensor and the programmable-gain unit are connected on respectively
On two paths between input.
5. the fully differential signal conditioning circuit for being applied to current excitation sensor according to any one of Claims 1 to 4,
It is characterized in that：The programmable-gain unit uses instrument amplifier.
6. the fully differential signal conditioning circuit for being applied to current excitation sensor according to any one of Claims 1 to 4,
It is characterized in that：The anti-aliasing filter unit uses the Butterworth low pass being made up of two 2 rank multiple feedback filter circuits
Wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620719417.8U CN206223801U (en) | 2016-07-08 | 2016-07-08 | It is applied to the fully differential signal conditioning circuit of current excitation sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620719417.8U CN206223801U (en) | 2016-07-08 | 2016-07-08 | It is applied to the fully differential signal conditioning circuit of current excitation sensor |
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| CN206223801U true CN206223801U (en) | 2017-06-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018865A (en) * | 2016-07-08 | 2016-10-12 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit for current excitation sensors |
| CN108827453A (en) * | 2018-04-25 | 2018-11-16 | 南京航空航天大学 | A kind of vibration signal acquisition system and acquisition method of distributed wireless synchronous network |
| CN108874295A (en) * | 2018-05-17 | 2018-11-23 | 郑州意昂新能源汽车科技有限公司 | Intelligent integrated signal condition system |
| CN109443522A (en) * | 2018-12-10 | 2019-03-08 | 江苏华创光电科技有限公司 | A kind of conditioning of vibration signal and data converter |
| CN110890121A (en) * | 2018-09-07 | 2020-03-17 | 合肥沛睿微电子股份有限公司 | Storage device and NAND flash memory controller thereof |
-
2016
- 2016-07-08 CN CN201620719417.8U patent/CN206223801U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018865A (en) * | 2016-07-08 | 2016-10-12 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit for current excitation sensors |
| CN106018865B (en) * | 2016-07-08 | 2018-12-21 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit applied to current excitation sensor |
| CN108827453A (en) * | 2018-04-25 | 2018-11-16 | 南京航空航天大学 | A kind of vibration signal acquisition system and acquisition method of distributed wireless synchronous network |
| CN108827453B (en) * | 2018-04-25 | 2024-04-30 | 南京航空航天大学 | Vibration signal acquisition system and method for distributed wireless synchronous networking |
| CN108874295A (en) * | 2018-05-17 | 2018-11-23 | 郑州意昂新能源汽车科技有限公司 | Intelligent integrated signal condition system |
| CN108874295B (en) * | 2018-05-17 | 2021-01-08 | 郑州意昂新能源汽车科技有限公司 | Intelligent integrated signal conditioning system |
| CN110890121A (en) * | 2018-09-07 | 2020-03-17 | 合肥沛睿微电子股份有限公司 | Storage device and NAND flash memory controller thereof |
| CN110890121B (en) * | 2018-09-07 | 2021-10-22 | 合肥沛睿微电子股份有限公司 | Storage device and NAND flash memory controller thereof |
| CN109443522A (en) * | 2018-12-10 | 2019-03-08 | 江苏华创光电科技有限公司 | A kind of conditioning of vibration signal and data converter |
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