CN104330742B - A kind of series mode interference suppressing method and device - Google Patents
A kind of series mode interference suppressing method and device Download PDFInfo
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- CN104330742B CN104330742B CN201410635976.6A CN201410635976A CN104330742B CN 104330742 B CN104330742 B CN 104330742B CN 201410635976 A CN201410635976 A CN 201410635976A CN 104330742 B CN104330742 B CN 104330742B
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Abstract
This application discloses a kind of series mode interference suppressing method and device, by setting the less sample resistance of resistance between the detection selection circuit and isolating amplifier circuit of battery pack, so that the output voltage of the isolating amplifier circuit is within the scope of the sampled voltage of sample-taking calculating circuit, so as to ensure that useful signal is superimposed with after series mode interference (i.e. mixed signal) sample range not over sample-taking calculating circuit, for effective filtering of the hamming code window filtering algorithm for prestoring is laid a good foundation from source, hamming code window filtering algorithm is improve to suppressing the reliability of series mode interference signal；The present invention is provided with Anti-aliasing Filter Circuits by sample-taking calculating circuit front end, ensure that effective implementation of AC Data, and calculated acquiring sampled signal sequence using hamming code window filtering algorithm, the requirement of the normal mode rejection ratio (NMRR) not less than 50dB of more than 40Hz has been reached, the series mode interference rejection ability and response speed of product has been effectively increased.
Description
Technical field
Technical field the invention mainly relates to suppress interference in battery test system, more specifically a kind of string mould is done
Disturb suppressing method and device.
Background technology
Series mode interference is primarily referred to as being produced due to inductive coupled (magnetic coupling) and capacitive coupling (field coupling) during measurement
Raw superposition interference on the input signals, in the actual test of battery, due to field wiring, installation environment, power supply treatment
Etc. non-ideal, series mode interference generally can be all introduced, the low-frequency disturbance for especially being produced by supply line's coupling is most difficult to control, if
Dealing with improperly will have a strong impact on the battery measurement degree of accuracy and response time.
In order to solve the problems, such as the series mode interference in battery test system, hardware filtering or soft would generally be used in the prior art
Part filtering mode suppresses series mode interference.Specifically, for hardware filtering mode, mould is typically set in battery monitoring system
Intend filter circuit, such as single order or second-order filter circuit, thus, in the case where series mode interference system is than Standard, such as requiring power frequency
When 50Hz normal mode rejection ratio (NMRR)s are not less than 50dB, the response time of monomer test is in more than 500ms, then, for using
The sampling of the 24 road monomer DC voltages that switching mode is carried out, the DC voltage sampling time patrolled and examined one week will be greater than 12s (i.e. 24
× 500ms), still more also need to survey the parameters such as its charging and discharging currents and battery temperature in battery test system
Examination, it is seen then that battery testing efficiency will be substantially reduced using existing series mode interference Restrain measurement, or even on 48 tunnels to expanding to
During the test of monomer voltage, existing series mode interference Restrain measurement will be unable to reach the requirement of real-time of battery test system.
And for software filtering mode, be typically with multi-point sampling and take the mode of its algorithm average value suppressing battery
The series mode interference introduced in test, but because the filter effect of this mode is influenceed than larger by series mode interference frequency, it is only right
The series mode interference inhibition of CF point (such as 50HZ) preferably, and is done to the string mould of other Frequency points (such as 60Hz, 40Hz)
Disturb inhibition very poor.
As can be seen here, how to realize fast and efficiently suppressing the series mode interference in battery test system, to ensure battery
Test accuracy and response time turn into the technical problem of current urgent need to resolve.
The content of the invention
In view of this, the invention provides a kind of series mode interference suppressing method and device, realize to battery test system
In series mode interference fast and efficiently suppression, it is ensured that the test accuracy of the battery test system and when shortening response
Between, so as to substantially increase battery testing efficiency.
To achieve these goals, this application provides following technical scheme：
A kind of series mode interference suppressing method, is applied to the series mode interference restraining device in battery test system, described device
Including the detection selection circuit, the sample resistance that are sequentially connected, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit,
Wherein, the sample resistance makes the output voltage of the isolating amplifier circuit in the default sampled voltage of the sample-taking calculating circuit
In the range of, then methods described includes：
Any cell all the way in the mesuring battary group is controlled to turn on；
Obtain the monomer battery voltage signal after being processed through the isolating amplifier circuit and the frequency overlapped-resistable filter；
Within the default sampling time, the monomer battery voltage signal is sampled according to preset sample frequency, obtained
Crude sampling sequence；
The all crude sampling sequences obtained in the default sampling time are entered using the hamming code window filtering algorithm for prestoring
Row treatment, it is determined that meeting the cell voltage of default normal mode rejection ratio (NMRR) requirement.
Preferably, when the default sampling period be four sampling periods when, it is described according to preset sample frequency to described
Monomer battery voltage signal is sampled, and obtaining crude sampling sequence includes：
Within each sampling period, the monomer battery voltage signal is sampled according to 3.2KHz sample frequencys, obtained
To including 64 crude sampling sequences of sampled point.
Preferably, after crude sampling sequence is obtained, and preset to described using the hamming code window filtering algorithm for prestoring
Before all crude sampling sequences obtained in sampling time are processed, methods described also includes：
Judge whether to complete four samplings in sampling period to the monomer battery voltage signal；
If not, being sampled to the monomer battery voltage signal according to preset sample frequency described in returning, original is obtained
Beginning sample sequence step is continued executing with；
If it is, performing described all to what is obtained in the default sampling time using the hamming code window filtering algorithm for prestoring
Crude sampling sequence is processed, it is determined that meeting the cell voltage step of default normal mode rejection ratio (NMRR) requirement.
Preferably, it is described all original to what is obtained in the default sampling time using the hamming code window filtering algorithm for prestoring
Sample sequence is processed, it is determined that the cell voltage for meeting default normal mode rejection ratio (NMRR) requirement includes：
Coefficient to resulting crude sampling sequence and the hamming code window filtering algorithm for prestoring carries out product calculation, obtains
Filtered signal sequence value；
Resulting all filtered signal sequence value is sued for peace, filtered signal sequence total value is obtained；
By the filtered signal sequence total value divided by the exponent number of hamming code window in the hamming code window filtering algorithm, expired
The cell voltage of the default normal mode rejection ratio (NMRR) requirement of foot.
Preferably, the hamming code window filtering algorithm for prestoring is 256 rank hamming code window FIR filtering algorithms, then the coefficient is
The 256 rank hamming code window coefficient.
Preferably, the monomer battery voltage signal is sampled according to preset sample frequency described, obtains original
Before sample sequence, methods described also includes：
By the default sampled voltage of the output voltage of the acquired isolating amplifier circuit and the sample-taking calculating circuit
Scope is compared；
When the output voltage of the isolating amplifier circuit exceeds the default sampled voltage scope, warning message is exported,
To remind user to adjust the resistance of the sample resistance.
A kind of series mode interference restraining device, is applied to battery test system, and described device includes：Detection selection circuit, takes
Sample resistance, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit, wherein：
The detection selection circuit be connected with mesuring battary group output end, in the control mesuring battary group arbitrarily all the way
Cell is turned on；
The sample resistance is connected with the output end and the isolating amplifier circuit of the detection selection circuit respectively, controls
The output voltage of the isolating amplifier circuit is in the range of the default sampled voltage of the sample-taking calculating circuit；
The frequency overlapped-resistable filter input is connected with the isolating amplifier circuit output end, to the isolating amplifier circuit
Output voltage carry out anti-aliasing filter；
The sample port of the sample-taking calculating circuit is connected with the aliasing filter output end, according to preset sample frequency
Voltage signal after being processed through the aliasing filter is sampled, crude sampling sequence is obtained, after presetting the sampling time,
The all crude sampling sequences obtained in the default sampling time are processed using the hamming code window filtering algorithm for prestoring, is obtained
To the cell voltage for meeting default normal mode rejection ratio (NMRR) requirement.
Preferably, described device also includes：It is connected with the sample-taking calculating circuit, when the output of the isolating amplifier circuit
When voltage is beyond the default sampled voltage scope of the sample-taking calculating circuit, the warning device of warning message is exported.
Preferably, when the hamming code window filtering algorithm for prestoring is 256 rank hamming code window FIR filtering algorithms, described device
Also include：It is connected with the sample-taking calculating circuit, by the artificial circuit for emulating 256 rank hamming code window systems of generation.
Preferably, the detection selection circuit includes multiple detection selection branch roads, and the detection selects the quantity of branch road
Than the mesuring battary group cell quantity more than one, wherein, the cell two ends connect an inspection respectively
Selection branch road is surveyed, and each described detection selection branch road includes a current-limiting resistance, and be connected with the current-limiting resistance
Electronic switch.
As can be seen here, compared with prior art, this application provides a kind of series mode interference suppressing method and device, it is used for
Series mode interference in battery test system is suppressed, to ensure the battery testing degree of accuracy and response speed, specifically, this hair
It is bright by setting the less sample resistance of resistance between the detection selection circuit and isolating amplifier circuit of battery pack so that should be every
Output voltage from amplifying circuit within the scope of the sampled voltage of sample-taking calculating circuit, so as to ensure that useful signal is superimposed with
It is the hamming code window filter for prestoring from source not over the sample range of sample-taking calculating circuit after series mode interference (i.e. mixed signal)
Effective filtering of ripple algorithm is laid a good foundation, and improves hamming code window filtering algorithm to suppressing the reliability of series mode interference signal；This
Invention is provided with Anti-aliasing Filter Circuits by sample-taking calculating circuit front end, it is ensured that effective implementation of AC Data,
And due to being calculated acquiring sampled signal sequence using hamming code window filtering algorithm, the string mould for having reached more than 40Hz is done
When disturbing requirement of the rejection ratio not less than 50dB, effectively increase the series mode interference rejection ability of product, and reducing system response
Between, so as to improve system response time.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of schematic flow sheet of series mode interference suppressing method embodiment of the invention；
Fig. 2 is a kind of structural representation of series mode interference restraining device embodiment of the invention；
Fig. 3 is the schematic flow sheet of another kind series mode interference suppressing method embodiment of the invention；
Fig. 4 is the simulation curve schematic diagram of another kind series mode interference suppressing method of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
This application provides a kind of series mode interference suppressing method and device, it is used to do the string mould in battery test system
Disturb and suppressed, to ensure the battery testing degree of accuracy and response time, specifically, the present invention is selected by the detection in battery pack
Resistance less sample resistance is set between circuit and isolating amplifier circuit so that the output voltage of the isolating amplifier circuit is being adopted
Within the scope of the sampled voltage of sample counting circuit, so as to ensure that useful signal is superimposed with after series mode interference (i.e. mixed signal) not
The sample range of sample-taking calculating circuit can be exceeded, for base has been established in effective filtering of the hamming code window filtering algorithm for prestoring from source
Plinth, improves hamming code window filtering algorithm to suppressing the reliability of series mode interference signal；The present invention is by before sample-taking calculating circuit
End is provided with Anti-aliasing Filter Circuits, it is ensured that effective implementation of AC Data, and using hamming code window filtering algorithm come right
Acquire sampled signal sequence to be calculated, reached the requirement of the normal mode rejection ratio (NMRR) not less than 50dB of more than 40Hz, have
Effect improves the series mode interference rejection ability of product, and reduces the response time, so as to improve system response time.
, wherein it is desired to explanation, can be according to GB/T13639-1992 in practical application of the invention《Technical process measurement
With the control system digital indicator of simulation input》In regulation implement, i.e., the frequency of series mode interference voltage and main power source be frequently
Rate is identical, and series mode interference voltage is not less than 100mV, SMRR (Series Mode interference Rejection
Ratio, normal mode rejection ratio (NMRR)) 50dB should be not less than.
Embodiment one：
The schematic flow sheet of the of the invention a kind of series mode interference suppressing method embodiment shown in reference picture 1, the method application
Series mode interference restraining device in battery test system, the structural representation of series mode interference restraining device as shown in Figure 2 should
Device can include that the sample resistance RS being sequentially connected, isolating amplifier circuit 210, frequency overlapped-resistable filter 220 and sampling calculate electricity
Road 230, wherein, sample resistance RS makes the output voltage of the isolating amplifier circuit 210 in the sample-taking calculating circuit 230
In the range of default sampled voltage, then the series mode interference suppressing method of the present embodiment may comprise steps of：
Step S110：Any conducting of cell all the way in control mesuring battary group；
As shown in Fig. 2 the battery pack in battery test system generally includes multiple cells, such as include 24 road monomers
The battery pack of battery, includes battery pack of 48 road cells etc., wherein, it is respectively connected with one at each cell two ends
Individual detection selection branch road, and detection selection branch route a current-limiting resistance RP and an electronic switch K series connection ditch is constituted, and passes through
Electronic switch K in the detection selection branch road at closure cell two ends, reaches the purpose for gating the cell.
Step S120：Obtain the monomer battery voltage signal after being processed through isolating amplifier circuit and frequency overlapped-resistable filter.
In actual applications, after any road cell is gated, its output monomer battery voltage signal will be through over sampling
The partial pressure of resistance RS obtains sampled signal, and now, the sampled signal is monomer battery voltage signal and is folded with series mode interference signal
Plus mixed signal, afterwards, sequentially pass through the isolation enhanced processing of isolating amplifier circuit, and frequency overlapped-resistable filter is anti-
Aliasing is filtered, so as to obtain for sample-taking calculating circuit sampling source signal.
It should be noted that be somebody's turn to do in the prior art, because battery pack scene disturbed condition is complicated, especially in battery pack
During discharge and recharge, series mode interference is far above the 100mV that standard is required, and the circuit design of existing battery test system does not consider foot
Enough allowances, cause part interference signal beyond sample range, after signal clipped wave, it is impossible to reach suppression by average algorithm again
The purpose of series mode interference processed.In this regard, the present invention is in the circuit design to series mode interference restraining device, by the inspection in battery pack
Survey between selection circuit and isolating amplifier circuit and choose the less resistance of resistance as sample resistance, make monomer battery voltage through being somebody's turn to do
The sampled signal that the partial pressure of sample resistance is obtained reserves enough allowances, so as to ensure the output voltage of isolating amplifier circuit i.e.
Efficiently sampling voltage range of the A point voltages without departing from sample-taking calculating circuit in Fig. 2, is that effective filtering of follow-up filtering algorithm is established
Fixed basis.
Optionally, before completing step S120 and performing step S130, the present invention can also put acquired isolation
The big output voltage of circuit is compared with the default sampled voltage scope of sample-taking calculating circuit, and in the isolating amplifier circuit
When output voltage exceeds the default sampled voltage scope, warning message is exported, to remind user to adjust the resistance of sample resistance.
Wherein, adjustment on the resistance to sample resistance can determine by testing, or true according to the experience of staff
Fixed etc., the present invention is not especially limited to this.
Step S130：Within the default sampling time, monomer battery voltage signal is sampled according to preset sample frequency,
Obtain crude sampling sequence.
In the present embodiment, the present invention utilizes AC Data principle, and hamming code window is added using multicycle sampled data
FIR filters solutions so that the response time of the test of cell is less than 100ms, so as to substantially increase battery testing efficiency.
Specifically, the embodiment of the present invention can use hamming code window filtering algorithm to be sampled for four cycles with 50Hz, in each sampling week
In phase, monomer battery voltage signal is sampled according to 3.2KHz sample frequencys, obtain including the original of 64 sampled points
Sample sequence, after completing four samplings in sampling period, continues executing with into step S130.
Optionally, in order to ensure sample-taking calculating circuit completes four samplings in sampling period, the present invention can be in step
After S130, further determine whether to complete four samplings in sampling period to monomer battery voltage signal, if it is not, then return to step
S130 is continued executing with, if so, then entering follow-up process.
Certainly, when the sampling in unfinished four sampling periods is judged, device can also export unfinished carrying of sampling
Show information, wherein, for the alerting pattern of the prompt message, the present invention is not especially limited.
Step S140：All original adopted to what is obtained in the default sampling time using the hamming code window filtering algorithm for prestoring
Sample sequence is processed, it is determined that meeting the cell voltage of default normal mode rejection ratio (NMRR) requirement.
In actual applications, after sample-taking calculating circuit obtains required crude sampling contact potential series, this original can be adopted
The coefficient of sample sequence and the hamming code window filtering algorithm for prestoring carries out product calculation, obtains filtered signal sequence value, then right
Resulting all filtered signal sequence value summation, after obtaining filtered signal sequence total value, by the filtered letter
Number sequence total value divided by hamming code window in hamming code window filtering algorithm exponent number, so as to be met default normal mode rejection ratio (NMRR) requirement
Cell voltage, afterwards, you can change the conducting of another road battery, and return to step S110 is continued executing with.
Wherein, the default normal mode rejection ratio (NMRR) requirement is SMRR (Series Mode interference
Rejection Ratio, normal mode rejection ratio (NMRR)) it is not less than 50dB (units：Decibel).
Optionally, default hamming code window filtering algorithm can be 256 rank hamming code window FIR filtering algorithms, now, hamming code window filter
The coefficient of ripple algorithm is 256 rank hamming code window coefficients, it is necessary to explanation, 256 ranks are not limited to for hamming code window filtering algorithm
A kind of hamming code window FIR filtering algorithms this algorithms, creative work determination is paid so long as not those skilled in the art, is belonged to
The scope of the present invention.
Learnt based on above-mentioned analysis, the present invention, as sample resistance, is that sampled signal is reserved using the less resistance of resistance
Go out the allowance of abundance, it is ensured that the voltage signal of sample-taking calculating circuit input is realized believing sampling in the range of its sampled voltage
The sampling of all series mode interference signals in number, the reliability of series mode interference is suppressed so as to improve；And, in order to effectively using friendship
Stream Sampling techniques, the present invention is provided with simple and lower-cost frequency overlapped-resistable filter in sample-taking calculating circuit input, in addition,
The present invention adds hamming code window filtering algorithm to crude sampling sequence using multicycle sampled data, during the response for testing cell
Between be less than 100ms, substantially increase testing efficiency, and make the normal mode rejection ratio (NMRR) of more than 40Hz not less than 50dB, effectively carry
The series mode interference ability of product high.
Embodiment two：
The schematic flow sheet of the present invention another kind series mode interference suppressing method embodiment shown in reference picture 3, the method should
For the series mode interference restraining device in battery test system, the structural representation of the series mode interference restraining device as shown in figure 2 above
Figure, the device can include：It is the detection selection circuit 210 that is sequentially connected, sample resistance RS, isolating amplifier circuit 220, anti-aliasing
Wave filter 230 and sample-taking calculating circuit 240, wherein, sample resistance RS makes the output voltage of the isolating amplifier circuit 220 exist
In the range of the default sampled voltage of the sample-taking calculating circuit 240, then the series mode interference suppressing method of the present embodiment can include
Following steps：
Step S310：Any conducting of cell all the way in control mesuring battary group.
Step S320：Obtain the monomer battery voltage signal after being processed through isolating amplifier circuit and frequency overlapped-resistable filter.
Step S330：Within each sampling period, monomer battery voltage signal is adopted according to 3.2KHz sample frequencys
Sample, obtains including 64 crude sampling sequences of sampled point.
Step S340：Judge whether to complete four samplings in sampling period to monomer battery voltage signal, if it is not, returning to step
Rapid S330 is continued executing with；If so, being performed into step S350.
Step S350：To in resulting crude sampling sequence and the 256 rank hamming code window FIR filtering algorithms for prestoring 256
The coefficient of rank hamming code window carries out product calculation, obtains filtered signal sequence value.
In the present embodiment, it is when the crude sampling sequence that will can be obtained in the step S330 successively rank hamming code window of dot product 256
Number, so as to obtain filtered signal sequence value.
, wherein it is desired to illustrate, the present invention is not especially limited to the specific exponent number of hamming code window filtering algorithm used, should
The response time of cell that filtering algorithm makes test is less than 100ms, for the battery pack for including 24 road cells, greatly
Its testing efficiency is improve greatly.
Step S360：Resulting all filtered signal sequence value is sued for peace, filtered signal sequence is obtained total
Value.
Step S370：By the filtered signal sequence total value of institute divided by 256, being met default normal mode rejection ratio (NMRR) will
The cell voltage asked.
Optionally, in order to determine the effect of series mode interference suppressing method of the present invention, the embodiment of the present invention can also be using imitative
True instrument (such as Matlab) emulates to series mode interference suppressing method of the invention.Specifically, being exported with to 2V cells
As a example by voltage sample, to the cell output voltage (i.e. useful signal) superposition peak value for the series mode interference voltage of 1V is imitated
Very, wherein, the voltage signal after superposition is：X (i)=2000+1000*sin (2*pi*f (j) * (i)/3200), wherein, i is electricity
Press the sampling number 1 to 256 of signal；J is Frequency point, and untill being incremented to 286Hz from 1Hz, Y (amplitude) central point is 2000mV,
After voltage signal after to superposition completes the sampling of multicycle, the filter of four cycle hamming code windows is carried out to gained crude sampling sequence
Ripple, is met the cell voltage of actual requirement, simulation waveform as shown in Figure 4.
Can directly be learnt by Fig. 4, in battery testing practical application, be obtained using series mode interference suppressor mode of the invention
Actual test result it is suitable with simulation result, realize to the normal mode rejection ratio (NMRR) of more than 40Hz not less than 50dB will
Ask, meet the requirement of battery monitoring system.
Understood based on above-mentioned analysis, when the series mode interference suppressing method that the present invention is provided not only shortens the response of system
Between, and, the anti-aliasing filter of the signal after being amplified by the sample resistance of small resistance and to isolation is processed, it is ensured that treatment
Voltage signal afterwards is that reliable basis have been established in the realization of AC Data within the scope of default sampled voltage, so that
Ensure that testing efficiency and the degree of accuracy of battery test system.
Embodiment three：
The structural representation of the of the invention a kind of series mode interference restraining device with reference to shown in Fig. 2, the device is applied to battery
Test system, the device can include：Detection selection circuit 210, sample resistance RS, isolating amplifier circuit 220, anti-aliasing filter
Device 230 and sample-taking calculating circuit 240, wherein：
The detection selection circuit 210 is connected with mesuring battary group output end, any in the control mesuring battary group
Cell conducting all the way.
Optionally, detection selection circuit 210 includes multiple detection selection branch roads, and the quantity ratio of detection selection branch road is described
The cell quantity of mesuring battary group is more one, wherein, the cell two ends connect a detection selection respectively
Branch road, and each described detection selection branch road is including a current-limiting resistance RP, and be connected with the current-limiting resistance RP
Electronic switch K.
Sample resistance RS is connected with the detection output end of selection circuit 210 and isolating amplifier circuit 220 respectively, and control isolation is put
The output voltage of big circuit 220 is in the range of the default sampled voltage of sample-taking calculating circuit 230.
As can be seen here, the embodiment of the present invention has reserved the allowance of abundance from hardware for sampled signal, is follow-up filtering
The reliable filtering of algorithm is laid a good foundation.
The input of frequency overlapped-resistable filter 230 is connected with the output end of isolating amplifier circuit 220, to isolating amplifier circuit 220
Output voltage carries out anti-aliasing filter, and certain basis has been established in the realization of AC Data.
The sample port of sample-taking calculating circuit 240 is connected with the output end of the aliasing filter 230, according to default sampling frequency
Rate is sampled to the voltage signal after being processed through the aliasing filter 230, obtains crude sampling sequence, during through default sampling
Between after, using the hamming code window filtering algorithm for prestoring at all crude sampling sequences for being obtained in the default sampling time
Reason, is met the cell voltage of default normal mode rejection ratio (NMRR) requirement.
In the present embodiment, the sample-taking calculating circuit 240 can be single-chip microcomputer, but be not limited to this, and the sampling is calculated
Circuit 240 can be found in the correspondence of above method embodiment to the collection of filtered voltage signal and series mode interference process of inhibition
Part, the present invention will not be repeated here.
Optionally, the device can also include：It is connected with sample-taking calculating circuit 240, when the isolating amplifier circuit 220
When output voltage is beyond the default sampled voltage scope of the sample-taking calculating circuit 240, the warning device of warning message is exported, with
Remind user that the sample resistance RS in the device is substituted for into smaller resistance and obtain resistance.
Wherein, the warning device can be indicator lamp, buzzer or voice module etc., and the present invention does not make specific limit to this
It is fixed.
In addition, when the hamming code window filtering algorithm for prestoring is 256 rank hamming code window FIR filtering algorithms, the string mould of the present embodiment
Interference rejection unit can also include：It is connected with sample-taking calculating circuit 240, by emulating the imitative of 256 rank hamming code window systems of generation
True circuit, specific simulation process can refer to the description of corresponding part in above-described embodiment two, and the present invention will not be described in detail herein.
It should be noted that on the various embodiments described above, such as first, second or the like relational terms are used merely to
One operation or circuit are made a distinction with another operation or circuit, and is not necessarily required or is implied these circuits or operation
Between there is any this actual relation or order.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponding with method disclosed in embodiment, so description is fairly simple, related part is referring to method part illustration
.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (8)
1. a kind of series mode interference suppressing method, it is characterised in that be applied to the series mode interference restraining device in battery test system,
Described device includes the detection selection circuit, the sample resistance that are sequentially connected, isolating amplifier circuit, frequency overlapped-resistable filter and sampling meter
Circuit is calculated, wherein, the sample resistance makes the output voltage of the isolating amplifier circuit in the default of the sample-taking calculating circuit
In the range of sampled voltage, then methods described includes：
Any conducting of cell all the way in control mesuring battary group；
Battery pack obtains the monomer battery voltage signal after being processed through the isolating amplifier circuit and the frequency overlapped-resistable filter；
By the default sampled voltage scope of the output voltage of the acquired isolating amplifier circuit and the sample-taking calculating circuit
It is compared；
When the output voltage of the isolating amplifier circuit exceeds the default sampled voltage scope, warning message is exported, to carry
The user that wakes up adjusts the resistance of the sample resistance；
Within the default sampling time, the monomer battery voltage signal is sampled according to preset sample frequency, obtain original
Sample sequence；
Using the hamming code window filtering algorithm for prestoring at all crude sampling sequences for being obtained in the default sampling time
Reason, it is determined that meeting the cell voltage of default normal mode rejection ratio (NMRR) requirement.
2. method according to claim 1, it is characterised in that when the default sampling period being four sampling periods,
Described the monomer battery voltage signal is sampled according to preset sample frequency, obtaining crude sampling sequence includes：
Within each sampling period, the monomer battery voltage signal is sampled according to 3.2KHz sample frequencys, wrapped
Contain 64 crude sampling sequences of sampled point.
3. method according to claim 2, it is characterised in that after crude sampling sequence is obtained, and using prestoring
Hamming code window filtering algorithm all crude sampling sequences obtained in the default sampling time are processed before, the side
Method also includes：
Judge whether to complete four samplings in sampling period to the monomer battery voltage signal；
If not, being sampled to the monomer battery voltage signal according to preset sample frequency described in returning, original adopting is obtained
Sample sequence step is continued executing with；
If it is, performing described all original to what is obtained in the default sampling time using the hamming code window filtering algorithm for prestoring
Sample sequence is processed, it is determined that meeting the cell voltage step of default normal mode rejection ratio (NMRR) requirement.
4. method according to claim 3, it is characterised in that it is described using the hamming code window filtering algorithm for prestoring to described pre-
If all crude sampling sequences obtained in the sampling time are processed, it is determined that meeting the electricity of default normal mode rejection ratio (NMRR) requirement
Cell voltage includes：
Coefficient to resulting crude sampling sequence and the hamming code window filtering algorithm for prestoring carries out product calculation, is filtered
Signal sequence value afterwards；
Resulting all filtered signal sequence value is sued for peace, filtered signal sequence total value is obtained；
By the filtered signal sequence total value divided by the exponent number of hamming code window in the hamming code window filtering algorithm, it is met pre-
If the cell voltage of normal mode rejection ratio (NMRR) requirement.
5. method according to claim 4, it is characterised in that it is bright that the hamming code window filtering algorithm for prestoring is that 256 ranks are breathed out
Window FIR filtering algorithms, then the coefficient is the 256 rank hamming code window coefficient.
6. a kind of series mode interference restraining device, is applied to battery test system, it is characterised in that described device includes：Detection choosing
Select circuit, sample resistance, isolating amplifier circuit, frequency overlapped-resistable filter, sample-taking calculating circuit and warning device, wherein：
The detection selection circuit is connected with mesuring battary group output end, controls any monomer all the way in the mesuring battary group
Battery is turned on；
The sample resistance is connected with the output end and the isolating amplifier circuit of the detection selection circuit respectively, and control is described
The output voltage of isolating amplifier circuit is in the range of the default sampled voltage of the sample-taking calculating circuit；
The frequency overlapped-resistable filter input is connected with the isolating amplifier circuit output end, to the defeated of the isolating amplifier circuit
Going out voltage carries out anti-aliasing filter；
The sample port of the sample-taking calculating circuit is connected with the frequency overlapped-resistable filter output end, according to preset sample frequency pair
Voltage signal after being processed through the frequency overlapped-resistable filter is sampled, and obtains crude sampling sequence, after presetting the sampling time,
The all crude sampling sequences obtained in the default sampling time are processed using the hamming code window filtering algorithm for prestoring, is obtained
To the cell voltage for meeting default normal mode rejection ratio (NMRR) requirement；
The warning device is connected with the sample-taking calculating circuit, when the output voltage of the isolating amplifier circuit is adopted beyond described
During the default sampled voltage scope of sample counting circuit, warning message is exported.
7. device according to claim 6, it is characterised in that when the hamming code window filtering algorithm for prestoring is that 256 ranks are breathed out
During bright window FIR filtering algorithms, described device also includes：It is connected with the sample-taking calculating circuit, breathes out bright by emulating 256 ranks of generation
The artificial circuit of window system.
8. device according to claim 7, it is characterised in that the detection selection circuit includes multiple detection selection branch
Road, and it is described detection selection branch road quantity than the mesuring battary group cell quantity more than one, wherein, the monomer
Battery two ends connect a detection selection branch road respectively, and each described detection selection branch road includes a current limliting electricity
Resistance, and the electronic switch being connected with the current-limiting resistance.
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| CN109343511A (en) * | 2018-10-22 | 2019-02-15 | 贵州电网有限责任公司 | A kind of DCS control system common mode and series mode rejection ratio test device and test method |
| CN111342816B (en) * | 2020-03-30 | 2023-04-18 | 潍柴动力股份有限公司 | Signal filtering method, device, system and readable medium |
| CN111934398B (en) * | 2020-09-18 | 2021-01-05 | 江苏时代新能源科技有限公司 | Battery charging control method and device |
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