CN104330742A - Method and device for suppressing series mode interference - Google Patents
Method and device for suppressing series mode interference Download PDFInfo
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- CN104330742A CN104330742A CN201410635976.6A CN201410635976A CN104330742A CN 104330742 A CN104330742 A CN 104330742A CN 201410635976 A CN201410635976 A CN 201410635976A CN 104330742 A CN104330742 A CN 104330742A
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Abstract
The invention discloses a method and a device for suppressing series mode interference. A sampling resistor relatively low in resistance is arranged between the detection selection circuit and the isolation amplifier circuit of a battery pack so that the output voltage of the isolation amplifier circuit can be kept within the sampling voltage range of a sampling computing circuit, and therefore, a useful signal superposed with the series mode interference, namely a mixed signal, does not exceed the sampling range of the sampling computing circuit, a foundation is laid for effective filtering of a pre-stored hamming code window filtering algorithm from the source and the reliability of the hamming code window filtering algorithm to the suppression of the series mode interference signals is improved. According to the method and the device for suppressing the series mode interference, as an anti-aliasing filter circuit is arranged at the front end of the sampling computing circuit, effective implementation of an alternating-current sampling technology is guaranteed; the hamming code window filtering algorithm is adopted to compute the obtained sampling signal sequence, and the requirement that the suppression ratio of the series mode interference above 40Hz is not smaller than 50dB is met, and the series mode interference suppression capacity and the response speed of the product are effectively improved.
Description
Technical field
The present invention relates generally in battery test system the technical field suppressing to disturb, and is more particularly a kind of series mode interference suppressing method and device.
Background technology
The superposition interference on the input signals that series mode interference produces due to inductive coupled (magnetic Field Coupling) and capacitive coupling (field coupled) when mainly referring to measurement, in the actual test of battery, due to non-ideal such as field wiring, installation environment, power supply process, usually all series mode interference can be introduced, especially the most difficult control of low-frequency disturbance produced by supply line's coupling, will have a strong impact on battery measurement accuracy and response time if deal with improperly.
In order to solve the series mode interference problem in battery test system, hardware filtering or software filtering mode in prior art, usually can be adopted to suppress series mode interference.Concrete, for hardware filtering mode, normally analogue filter circuit is set in battery monitoring system, as single order or second-order filter circuit, thus, in series mode interference system than under Standard, as when requiring power frequency 50Hz normal mode rejection ratio (NMRR) to be not less than 50dB, the response time of monomer test is all at more than 500ms, so, for the sampling of the 24 road monomer DC voltage adopting switching mode to carry out, the DC voltage sampling time of patrolling and examining one week will be greater than 12s (i.e. 24 × 500ms), also need still more to test its parameter such as charging and discharging currents and battery temperature in battery test system, visible, existing series mode interference Restrain measurement is adopted will greatly to reduce battery testing efficiency, even when the test to the 48 road monomer voltages expanded to, existing series mode interference Restrain measurement cannot reach the requirement of real-time of battery test system.
And for software filtering mode, normally adopt multi-point sampling and the mode of getting its algorithm mean value to suppress the series mode interference introduced in battery testing, but because the filter effect of this mode is larger by the impact of series mode interference frequency, only better to the series mode interference inhibition of characteristic frequency point (as 50HZ), and very poor to the series mode interference inhibition of other Frequency points (as 60Hz, 40Hz).
As can be seen here, how to realize suppressing fast and efficiently the series mode interference in battery test system, to ensure that battery testing accuracy and response time become the technical matters needing solution at present badly.
Summary of the invention
In view of this, the invention provides a kind of series mode interference suppressing method and device, achieve the suppression fast and efficiently to the series mode interference in battery test system, ensure that the test accuracy of this battery test system and shorten the response time, thus substantially increase battery testing efficiency.
To achieve these goals, this application provides following technical scheme:
A kind of series mode interference suppressing method, be applied to the series mode interference restraining device in battery test system, described device comprises the detection selection circuit, the sample resistance that connect successively, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit, wherein, described sample resistance makes the output voltage of described isolating amplifier circuit within the scope of the default sampled voltage of described sample-taking calculating circuit, then described method comprises:
Control any road cell conducting in described mesuring battary group;
Obtain the monomer battery voltage signal after described isolating amplifier circuit and described frequency overlapped-resistable filter process;
Within the default sampling time, according to default sample frequency, described monomer battery voltage signal is sampled, obtain crude sampling sequence;
Utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, determine to meet the cell voltage preset normal mode rejection ratio (NMRR) and require.
Preferably, when the described default sampling period is four sampling periods, describedly according to default sample frequency, described monomer battery voltage signal to be sampled, obtains crude sampling sequence and comprise:
Within each sampling period, according to 3.2KHz sample frequency, described monomer battery voltage signal is sampled, obtain the crude sampling sequence including 64 sampled points.
Preferably, after obtaining crude sampling sequence, and utilizing before the hamming code window filtering algorithm that prestores processes all crude sampling sequences obtained in the described default sampling time, described method also comprises:
Judge whether the sampling described monomer battery voltage signal being completed to four sampling periods;
If not, according to default sample frequency, described monomer battery voltage signal is sampled described in returning, obtain crude sampling sequence step and continue to perform;
If so, perform the hamming code window filtering algorithm that described utilization prestores and all crude sampling sequences obtained in the described default sampling time are processed, determine to meet the cell voltage step preset normal mode rejection ratio (NMRR) and require.
Preferably, the hamming code window filtering algorithm that described utilization prestores processes all crude sampling sequences obtained in the described default sampling time, determines to meet the cell voltage presetting normal mode rejection ratio (NMRR) requirement and comprises:
Product calculation is carried out to obtained crude sampling sequence and the coefficient of hamming code window filtering algorithm that prestores, obtains filtered burst value;
To obtained all filtered burst value summation, obtain filtered burst total value;
By the exponent number of described filtered burst total value divided by hamming code window in described hamming code window filtering algorithm, be met the cell voltage that default normal mode rejection ratio (NMRR) requires.
Preferably, described in the hamming code window filtering algorithm that prestores be 256 rank hamming code window FIR filtering algorithms, then described coefficient is described 256 rank hamming code window coefficients.
Preferably, sample to described monomer battery voltage signal according to default sample frequency described, before obtaining crude sampling sequence, described method also comprises:
The default sampled voltage scope of the output voltage of obtained described isolating amplifier circuit and described sample-taking calculating circuit is compared;
When the output voltage of described isolating amplifier circuit exceeds described default sampled voltage scope, output alarm information, adjusts the resistance of described sample resistance with reminding user.
A kind of series mode interference restraining device, be applied to battery test system, described device comprises: detect selection circuit, sample resistance, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit, wherein:
Described detection selection circuit is connected with mesuring battary group output terminal, controls any road cell conducting in described mesuring battary group;
Described sample resistance is connected with the output terminal of described detection selection circuit and described isolating amplifier circuit respectively, controls the output voltage of described isolating amplifier circuit within the scope of the default sampled voltage of described sample-taking calculating circuit;
Described frequency overlapped-resistable filter input end is connected with described isolating amplifier circuit output terminal, carries out anti-aliasing filter to the output voltage of described isolating amplifier circuit;
The sample port of described sample-taking calculating circuit is connected with described aliasing filter output terminal, according to default sample frequency, the voltage signal after described aliasing filter process is sampled, obtain crude sampling sequence, after presetting the sampling time, utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, be met the cell voltage that default normal mode rejection ratio (NMRR) requires.
Preferably, described device also comprises: be connected with described sample-taking calculating circuit, when the output voltage of described isolating amplifier circuit exceeds the default sampled voltage scope of described sample-taking calculating circuit, and the warning device of output alarm information.
Preferably, when the described hamming code window filtering algorithm prestored is 256 rank hamming code window FIR filtering algorithm, described device also comprises: be connected with described sample-taking calculating circuit, by the artificial circuit of emulation generation 256 rank hamming code window system.
Preferably, described detection selection circuit comprises multiple detection and selects branch road, and many one of the cell quantity of mesuring battary group described in the described number ratio detecting selection branch road, wherein, described cell two ends connect a described detection respectively and select branch road, and detection described in each selects branch road to include a current-limiting resistance, and the electronic switch be connected with described current-limiting resistance.
As can be seen here, compared with prior art, this application provides a kind of series mode interference suppressing method and device, it is for suppressing the series mode interference in battery test system, to ensure battery testing accuracy and response speed, concrete, the present invention by arranging the less sample resistance of resistance between the detection selection circuit and isolating amplifier circuit of electric battery, make the output voltage of this isolating amplifier circuit within the sampled voltage scope of sample-taking calculating circuit, thus ensure that the sample range that can not exceed sample-taking calculating circuit after useful signal is superimposed with series mode interference (i.e. mixed signal), for effective filtering of the hamming code window filtering algorithm prestored is laid a good foundation from source, improve hamming code window filtering algorithm to the reliability suppressing series mode interference signal, the present invention is by being provided with Anti-aliasing Filter Circuits in sample-taking calculating circuit front end, ensure that effective enforcement of AC Data, and owing to adopting hamming code window filtering algorithm to calculate acquiring sampled signal sequence, the normal mode rejection ratio (NMRR) reaching more than 40Hz is not less than the requirement of 50dB, effectively improve the series mode interference rejection ability of product, and decrease system response time, thus improve system response time.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the schematic flow sheet of a kind of series mode interference suppressing method of the present invention embodiment;
Fig. 2 is the structural representation of a kind of series mode interference restraining device of the present invention embodiment;
Fig. 3 is the schematic flow sheet of the present invention's another kind of series mode interference suppressing method embodiment;
Fig. 4 is the simulation curve schematic diagram of the another kind of series mode interference suppressing method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
This application provides a kind of series mode interference suppressing method and device, it is for suppressing the series mode interference in battery test system, to ensure battery testing accuracy and response time, concrete, the present invention by arranging the less sample resistance of resistance between the detection selection circuit and isolating amplifier circuit of electric battery, make the output voltage of this isolating amplifier circuit within the sampled voltage scope of sample-taking calculating circuit, thus ensure that the sample range that can not exceed sample-taking calculating circuit after useful signal is superimposed with series mode interference (i.e. mixed signal), for effective filtering of the hamming code window filtering algorithm prestored is laid a good foundation from source, improve hamming code window filtering algorithm to the reliability suppressing series mode interference signal, the present invention is by being provided with Anti-aliasing Filter Circuits in sample-taking calculating circuit front end, ensure that effective enforcement of AC Data, and adopt hamming code window filtering algorithm to calculate acquiring sampled signal sequence, the normal mode rejection ratio (NMRR) reaching more than 40Hz is not less than the requirement of 50dB, effectively improve the series mode interference rejection ability of product, and decrease the response time, thus improve system response time.
Wherein, it should be noted that, can implement according to the regulation in GB/T13639-1992 " technical process measurement and the digital indicator of control system analog input " in practical application of the present invention, namely the frequency of series mode interference voltage is identical with primary power frequency, series mode interference voltage is for being not less than 100mV, SMRR (Series Mode interference Rejection Ratio, normal mode rejection ratio (NMRR)) should be not less than 50dB.
Embodiment one:
With reference to the schematic flow sheet of a kind of series mode interference suppressing method of the present invention embodiment shown in Fig. 1, the method is applied to the series mode interference restraining device in battery test system, the structural representation of series mode interference restraining device as shown in Figure 2, this device can comprise the sample resistance RS connected successively, isolating amplifier circuit 210, frequency overlapped-resistable filter 220 and sample-taking calculating circuit 230, wherein, this sample resistance RS makes the output voltage of described isolating amplifier circuit 210 within the scope of the default sampled voltage of described sample-taking calculating circuit 230, then the series mode interference suppressing method of the present embodiment can comprise the following steps:
Step S110: control any road cell conducting in mesuring battary group;
As shown in Figure 2, electric battery in battery test system generally includes multiple cell, as included the electric battery of 24 road cells, include electric battery of 48 road cells etc., wherein, be all connected with one at each cell two ends and detect selection branch road, and this detection selects a route current-limiting resistance RP and electronic switch K series connection ditch to form, selected the electronic switch K in branch road by the detection at closed cell two ends, reach the object of this cell of gating.
Step S120: obtain the monomer battery voltage signal after isolating amplifier circuit and frequency overlapped-resistable filter process.
In actual applications, when after the cell of gating arbitrary road, it exports monomer battery voltage signal and the dividing potential drop through sample resistance RS is obtained sampled signal, now, this sampled signal is the mixed signal of monomer battery voltage signal and series mode interference Signal averaging, and afterwards, process is amplified in the isolation successively through isolating amplifier circuit, and the anti-aliasing filter of frequency overlapped-resistable filter, thus obtain for sample-taking calculating circuit sampling source signal.
It should be noted that, in the prior art should, because the on-the-spot disturbed condition of electric battery is complicated, especially when battery set charge/discharge, series mode interference is far above the 100mV of standard-required, and the circuit design of existing battery test system does not consider enough allowances, causes part undesired signal to exceed sample range, after signal clipped wave, cannot reach by average algorithm the object suppressing series mode interference again.To this, the present invention is when the circuit design to series mode interference restraining device, by choosing the less resistance of resistance as sample resistance between the detection selection circuit and isolating amplifier circuit of electric battery, the sampled signal that monomer battery voltage is obtained through the dividing potential drop of this sample resistance reserves enough allowances, thus ensure that the A point voltage in the output voltage of isolating amplifier circuit and Fig. 2 does not exceed the efficiently sampling voltage range of sample-taking calculating circuit, for effective filtering of follow-up filtering algorithm lays the foundation.
Optionally, to perform before step S130 at completing steps S120, the default sampled voltage scope of the output voltage of obtained isolating amplifier circuit and sample-taking calculating circuit can also compare by the present invention, and when the output voltage of this isolating amplifier circuit exceeds described default sampled voltage scope, output alarm information, with the resistance of reminding user adjustment sample resistance.
Wherein, the adjustment about the resistance to sample resistance is determined by test, or determines etc. according to the experience of staff, and the present invention does not do concrete restriction to this.
Step S130: within the default sampling time, samples to monomer battery voltage signal according to default sample frequency, obtains crude sampling sequence.
In the present embodiment, the present invention utilizes AC Data principle, adopts multicycle sampled data to add the FIR filters solutions of hamming code window, makes the response time of the test of cell be less than 100ms, thus substantially increase battery testing efficiency.
Concrete, the embodiment of the present invention can adopt hamming code window filtering algorithm to sample for four cycles with 50Hz, within each sampling period, according to 3.2KHz sample frequency, monomer battery voltage signal is sampled, obtain the crude sampling sequence including 64 sampled points, after completing the sampling in four sampling periods, enter step S130 and continue to perform.
Optionally, complete the sampling in four sampling periods in order to ensure sample-taking calculating circuit, the present invention can after step S130, judge whether sampling monomer battery voltage signal being completed to four sampling periods further, if not, then return step S130 and continue to perform, if so, follow-up flow process is then entered.
Certainly, when judging the sampling not completing four sampling periods, device can also export the information that sampling does not complete, and wherein, for the alerting pattern of this information, the present invention does not do concrete restriction.
Step S140: utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, determines to meet the cell voltage preset normal mode rejection ratio (NMRR) and require.
In actual applications, after sample-taking calculating circuit obtains required crude sampling contact potential series, product calculation can be carried out to the coefficient of this crude sampling sequence and the hamming code window filtering algorithm prestored, obtain filtered burst value, again to obtained all filtered burst value summation, after obtaining filtered burst total value, by the exponent number of this filtered burst total value divided by hamming code window in hamming code window filtering algorithm, thus be met the cell voltage of default normal mode rejection ratio (NMRR) requirement, afterwards, i.e. another road battery conducting replaceable, and return step S110 continuation execution.
Wherein, this default normal mode rejection ratio (NMRR) requires to be not less than 50dB (unit: decibel) for SMRR (Series Mode interference Rejection Ratio, normal mode rejection ratio (NMRR)).
Optionally; the hamming code window filtering algorithm preset can be 256 rank hamming code window FIR filtering algorithms; now; the coefficient of hamming code window filtering algorithm is 256 rank hamming code window coefficients; it should be noted that; 256 rank these a kind of algorithms of hamming code window FIR filtering algorithm are not limited to for hamming code window filtering algorithm, pay so long as not those skilled in the art that creative work determines, all belong to scope.
Learn based on above-mentioned analysis, the resistance that the present invention adopts resistance less is as sample resistance, for sampled signal reserves sufficient allowance, ensure that the voltage signal of sample-taking calculating circuit input end is within the scope of its sampled voltage, realize the sampling to series mode interference signals all in sampled signal, thus improve the reliability suppressing series mode interference; And, in order to effectively utilize AC Data, the present invention is provided with simple and lower-cost frequency overlapped-resistable filter at sample-taking calculating circuit input end, in addition, the present invention adopts multicycle sampled data to add hamming code window filtering algorithm to crude sampling sequence, and the response time that cell is tested is less than 100ms, substantially increases testing efficiency, and make the normal mode rejection ratio (NMRR) of more than 40Hz be not less than 50dB, effectively improve the series mode interference ability of product.
Embodiment two:
With reference to the schematic flow sheet of the another kind of series mode interference suppressing method of the present invention shown in Fig. 3 embodiment, the method is applied to the series mode interference restraining device in battery test system, the structural representation of the series mode interference restraining device as above shown in Fig. 2, this device can comprise: the detection selection circuit 210 connected successively, sample resistance RS, isolating amplifier circuit 220, frequency overlapped-resistable filter 230 and sample-taking calculating circuit 240, wherein, this sample resistance RS makes the output voltage of described isolating amplifier circuit 220 within the scope of the default sampled voltage of described sample-taking calculating circuit 240, then the series mode interference suppressing method of the present embodiment can comprise the following steps:
Step S310: control any road cell conducting in mesuring battary group.
Step S320: obtain the monomer battery voltage signal after isolating amplifier circuit and frequency overlapped-resistable filter process.
Step S330: within each sampling period, samples to monomer battery voltage signal according to 3.2KHz sample frequency, obtains the crude sampling sequence including 64 sampled points.
Step S340: judge whether sampling monomer battery voltage signal being completed to four sampling periods, if not, returns step S330 and continues to perform; If so, enter step S350 to perform.
Step S350: product calculation is carried out to the coefficient of 256 rank hamming code windows in obtained crude sampling sequence and the 256 rank hamming code window FIR filtering algorithms that prestore, obtains filtered burst value.
In the present embodiment, when by the coefficient of the crude sampling sequence that obtains in step S330 successively dot product 256 rank hamming code window, thus filtered burst value being obtained.
Wherein, it should be noted that, the concrete exponent number of the present invention to hamming code window filtering algorithm used does not do concrete restriction, and the response time of the cell test that this filtering algorithm makes is less than 100ms, for the electric battery including 24 road cells, substantially increase its testing efficiency.
Step S360: to obtained all filtered burst value summation, obtain filtered burst total value.
Step S370: by filtered for institute burst total value divided by 256, is met the cell voltage that default normal mode rejection ratio (NMRR) requires.
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 utilize emulation tool (as Matlab) to emulate series mode interference suppressing method of the present invention.Concrete, to be sampled as example to 2V cell output voltage, superposing peak value to this cell output voltage (i.e. useful signal) is that the series mode interference voltage of 1V emulates, wherein, voltage signal after superposition is: x (i)=2000+1000*sin (2*pi*f (j) * (i)/3200), wherein, i is the sampling number 1 to 256 of voltage signal; J is Frequency point, till being incremented to 286Hz from 1Hz, Y (amplitude) central point is 2000mV, after multiply periodic sampling is completed to the voltage signal after superposition, the hamming code window filtering of four cycles is carried out to gained crude sampling sequence, be met the cell voltage of actual requirement, simulation waveform figure as shown in Figure 4.
Can directly be learnt by Fig. 4, in battery testing practical application, the actual test result adopting series mode interference suppressor mode of the present invention to obtain is suitable with simulation result, achieves the requirement normal mode rejection ratio (NMRR) of more than 40Hz being not less than to 50dB, meets the requirement of battery monitoring system.
Known based on above-mentioned analysis, series mode interference suppressing method provided by the invention not only shortens the response time of system, and, by the sample resistance of little resistance and the anti-aliasing filter process to the signal after isolation amplification, ensure that the voltage signal after process is within the sampled voltage scope preset, reliable basis has been established in realization for AC Data, thus ensure that testing efficiency and the accuracy of battery test system.
Embodiment three:
The structural representation of a kind of series mode interference restraining device of the present invention shown in composition graphs 2, this application of installation is in battery test system, this device can comprise: detect selection circuit 210, sample resistance RS, isolating amplifier circuit 220, frequency overlapped-resistable filter 230 and sample-taking calculating circuit 240, wherein:
Described detection selection circuit 210 is connected with mesuring battary group output terminal, controls any road cell conducting in described mesuring battary group.
Optionally, detect selection circuit 210 and comprise multiple detection selection branch road, and many one of the cell quantity of mesuring battary group described in the number ratio of detection selection branch road, wherein, described cell two ends connect a described detection respectively and select branch road, and detection described in each selects branch road to include a current-limiting resistance RP, and the electronic switch K be connected with described current-limiting resistance RP.
Sample resistance RS is connected with detection selection circuit 210 output terminal and isolating amplifier circuit 220 respectively, controls the output voltage of isolating amplifier circuit 220 within the scope of the default sampled voltage of sample-taking calculating circuit 230.
As can be seen here, the embodiment of the present invention from hardware for sampled signal has reserved sufficient allowance, for the reliable filtering of follow-up filtering algorithm is laid a good foundation.
Frequency overlapped-resistable filter 230 input end is connected with isolating amplifier circuit 220 output terminal, carries out anti-aliasing filter to the output voltage of isolating amplifier circuit 220, and certain basis has been established in the realization of AC Data.
The sample port of sample-taking calculating circuit 240 is connected with described aliasing filter 230 output terminal, according to default sample frequency, the voltage signal after described aliasing filter 230 process is sampled, obtain crude sampling sequence, after presetting the sampling time, utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, be met the cell voltage that default normal mode rejection ratio (NMRR) requires.
In the present embodiment, this sample-taking calculating circuit 240 can be single-chip microcomputer, but be not limited to this, and this sample-taking calculating circuit 240 can see the corresponding part of said method embodiment to the collection of filtered voltage signal and series mode interference process of inhibition, the present invention does not repeat them here.
Optionally, this device can also comprise: be connected with sample-taking calculating circuit 240, when the output voltage of described isolating amplifier circuit 220 exceeds the default sampled voltage scope of described sample-taking calculating circuit 240, the warning device of output alarm information, replaces to less resistance with reminding user by the sample resistance RS in this device and obtains resistance.
Wherein, this warning device can be pilot lamp, hummer or voice module etc., and the present invention does not do concrete restriction to this.
In addition, when the hamming code window filtering algorithm prestored is 256 rank hamming code window FIR filtering algorithm, the series mode interference restraining device of the present embodiment can also comprise: be connected with sample-taking calculating circuit 240, by the artificial circuit of emulation generation 256 rank hamming code window system, concrete simulation process can refer to the description of corresponding part in above-described embodiment two, and the present invention is not described in detail in this.
It should be noted that, about in the various embodiments described above, the such as relational terms of first, second grade and so on is only used for an operation or circuit and another operates or circuit region separates, and not necessarily requires or imply the relation or order that there is any this reality between these circuit or operation.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it is corresponding with method disclosed in embodiment, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a series mode interference suppressing method, it is characterized in that, be applied to the series mode interference restraining device in battery test system, described device comprises the detection selection circuit, the sample resistance that connect successively, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit, wherein, described sample resistance makes the output voltage of described isolating amplifier circuit within the scope of the default sampled voltage of described sample-taking calculating circuit, then described method comprises:
Control any road cell conducting in described mesuring battary group;
Electric battery obtains the monomer battery voltage signal after described isolating amplifier circuit and described frequency overlapped-resistable filter process;
Within the default sampling time, according to default sample frequency, described monomer battery voltage signal is sampled, obtain crude sampling sequence;
Utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, determine to meet the cell voltage preset normal mode rejection ratio (NMRR) and require.
2. method according to claim 1, is characterized in that, when the described default sampling period is four sampling periods, describedly to sample to described monomer battery voltage signal according to default sample frequency, obtains crude sampling sequence and comprise:
Within each sampling period, according to 3.2KHz sample frequency, described monomer battery voltage signal is sampled, obtain the crude sampling sequence including 64 sampled points.
3. method according to claim 2, is characterized in that, after obtaining crude sampling sequence, and utilizing before the hamming code window filtering algorithm that prestores processes all crude sampling sequences obtained in the described default sampling time, described method also comprises:
Judge whether the sampling described monomer battery voltage signal being completed to four sampling periods;
If not, according to default sample frequency, described monomer battery voltage signal is sampled described in returning, obtain crude sampling sequence step and continue to perform;
If so, perform the hamming code window filtering algorithm that described utilization prestores and all crude sampling sequences obtained in the described default sampling time are processed, determine to meet the cell voltage step preset normal mode rejection ratio (NMRR) and require.
4. method according to claim 3, it is characterized in that, the hamming code window filtering algorithm that described utilization prestores processes all crude sampling sequences obtained in the described default sampling time, determines to meet the cell voltage presetting normal mode rejection ratio (NMRR) requirement and comprises:
Product calculation is carried out to obtained crude sampling sequence and the coefficient of hamming code window filtering algorithm that prestores, obtains filtered burst value;
To obtained all filtered burst value summation, obtain filtered burst total value;
By the exponent number of described filtered burst total value divided by hamming code window in described hamming code window filtering algorithm, be met the cell voltage that default normal mode rejection ratio (NMRR) requires.
5. method according to claim 4, is characterized in that, described in the hamming code window filtering algorithm that prestores be 256 rank hamming code window FIR filtering algorithms, then described coefficient is described 256 rank hamming code window coefficients.
6. the method according to any one of claim 1-5, is characterized in that, sample to described monomer battery voltage signal according to default sample frequency described, before obtaining crude sampling sequence, described method also comprises:
The default sampled voltage scope of the output voltage of obtained described isolating amplifier circuit and described sample-taking calculating circuit is compared;
When the output voltage of described isolating amplifier circuit exceeds described default sampled voltage scope, output alarm information, adjusts the resistance of described sample resistance with reminding user.
7. a series mode interference restraining device, is applied to battery test system, it is characterized in that, described device comprises: detect selection circuit, sample resistance, isolating amplifier circuit, frequency overlapped-resistable filter and sample-taking calculating circuit, wherein:
Described detection selection circuit is connected with mesuring battary group output terminal, controls any road cell conducting in described mesuring battary group;
Described sample resistance is connected with the output terminal of described detection selection circuit and described isolating amplifier circuit respectively, controls the output voltage of described isolating amplifier circuit within the scope of the default sampled voltage of described sample-taking calculating circuit;
Described frequency overlapped-resistable filter input end is connected with described isolating amplifier circuit output terminal, carries out anti-aliasing filter to the output voltage of described isolating amplifier circuit;
The sample port of described sample-taking calculating circuit is connected with described aliasing filter output terminal, according to default sample frequency, the voltage signal after described aliasing filter process is sampled, obtain crude sampling sequence, after presetting the sampling time, utilize the hamming code window filtering algorithm prestored to process all crude sampling sequences obtained in the described default sampling time, be met the cell voltage that default normal mode rejection ratio (NMRR) requires.
8. device according to claim 7, it is characterized in that, described device also comprises: be connected with described sample-taking calculating circuit, when the output voltage of described isolating amplifier circuit exceeds the default sampled voltage scope of described sample-taking calculating circuit, and the warning device of output alarm information.
9. the device according to claim 7 or 8, it is characterized in that, when the described hamming code window filtering algorithm prestored is 256 rank hamming code window FIR filtering algorithm, described device also comprises: be connected with described sample-taking calculating circuit, by the artificial circuit of emulation generation 256 rank hamming code window system.
10. device according to claim 9, it is characterized in that, described detection selection circuit comprises multiple detection and selects branch road, and many one of the cell quantity of mesuring battary group described in the described number ratio detecting selection branch road, wherein, described cell two ends connect a described detection respectively and select branch road, and detection described in each selects branch road to include a current-limiting resistance, and the electronic switch be connected with described current-limiting resistance.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111934398A (en) * | 2020-09-18 | 2020-11-13 | 江苏时代新能源科技有限公司 | Battery charging control method and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111342816A (en) * | 2020-03-30 | 2020-06-26 | 潍柴动力股份有限公司 | Signal filtering method, device, system and readable medium |
| 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 |
| CN111934398A (en) * | 2020-09-18 | 2020-11-13 | 江苏时代新能源科技有限公司 | Battery charging control method and device |
| WO2022057583A1 (en) * | 2020-09-18 | 2022-03-24 | 江苏时代新能源科技有限公司 | Battery charging control method and device |
| US11735945B2 (en) | 2020-09-18 | 2023-08-22 | Jiangsu Contemporary Amperex Technology Limited | Battery charging control method and device |
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| CN104330742B (en) | 2017-07-07 |
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