CN113434951B - Evaluation method, device and system for anti-ripple interference capability - Google Patents
Evaluation method, device and system for anti-ripple interference capability Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims description 17
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application relates to a method, a device and a system for evaluating anti-ripple interference capability, wherein the method comprises the following steps: acquiring ripple noise data of an interference source; processing the ripple noise data to obtain a mathematical model of the waveform to be fitted; modulating signals according to a mathematical model to obtain a fitting waveform; injecting fitting waveforms into the high-voltage component to be tested; acquiring performance data and/or operation data output by a high-voltage component to be detected; a tamper resistance level value of the high voltage component to be tested is determined based on the performance data and/or the operational data. Therefore, the problem that the influence of the ripple noise on the high-voltage component cannot be estimated can be solved, and an estimation scheme is provided for the ripple noise immunity of the high-voltage component.
Description
Technical Field
The application relates to the technical field of new energy automobiles, in particular to an evaluation method, device and system for anti-ripple interference capability.
Background
Along with the increasing serious energy and environmental problems, the development of new energy electric vehicles is an effective measure for promoting energy conservation and emission reduction, so that the research of the new energy electric vehicles becomes more and more important, but compared with the traditional vehicles, the electromagnetic compatibility problem of the new energy electric vehicles is more prominent, and the new energy electric vehicles gradually become a core problem for influencing the safety of an electric system of the electric vehicles.
The electromagnetic interference problem of the new energy automobile mainly comes from a high-voltage component system, mainly because the motor operation needs large current drive, when the motor working state is changed, the current can jump in a very short time and the high-power semiconductor switch can be switched, so that the high-voltage component system has abrupt current and voltage changes, and strong electromagnetic interference noise can be generated.
In a new energy automobile, high-voltage components such as an electric drive system, an On Board Charger (OBC), a DC-DC (direct current-direct current) and a PTC (positive temperature coefficient) heater, an air conditioner compressor and a high-voltage battery form a high-voltage system of the new energy automobile, and the high-voltage system is a core component of the new energy automobile, and the overall performance of the high-voltage system, particularly the high-voltage transient interference resistance of each high-voltage component, has important significance for guaranteeing the safety performance of the whole automobile.
Under the working condition modes of normal operation, starting, running, acceleration and deceleration, charging and the like of a new energy automobile, a power high-voltage line can generate ripple noise, noise signals can be transmitted through the high-voltage line, interference is caused to other high-voltage components, and the safety problem of the whole automobile can be caused, but at present, no standard is provided for evaluating and guiding the ripple noise immunity of a new energy high-voltage system and high-voltage components.
Disclosure of Invention
The embodiment of the application provides an evaluation method, device and system for anti-ripple interference capability, which can solve the problem that the influence of ripple noise on a high-voltage component cannot be evaluated and provide an evaluation scheme for the ripple noise anti-interference capability of the high-voltage component.
In one aspect, the present application provides a method for evaluating anti-ripple interference capability, including:
acquiring ripple noise data of an interference source;
processing the ripple noise data to obtain a mathematical model of the waveform to be fitted;
modulating signals according to a mathematical model to obtain a fitting waveform;
injecting fitting waveforms into the high-voltage component to be tested;
acquiring performance data and/or operation data output by a high-voltage component to be detected;
a tamper resistance level value of the high voltage component to be tested is determined based on the performance data and/or the operational data.
Optionally, the ripple noise data comprises one or more of a frequency, amplitude, or internal oscillation frequency of a noise waveform of the interferer; the interference source comprises one or more of an electric drive system, an on-vehicle charger, a direct current power supply converter, an on-vehicle heater, an air conditioner compressor or a high-voltage battery;
acquiring ripple noise data of an interference source, comprising:
and sampling ripple noise generated by the interference source to obtain one or more of the frequency, amplitude or internal oscillation frequency of the noise waveform.
Optionally, after performing signal modulation according to the mathematical model to obtain a fitting waveform, before injecting the fitting waveform into the high-voltage component to be tested, the method further includes:
the fitted waveforms are calibrated.
Optionally, determining the level of tamper resistance of the high voltage component to be tested based on the performance data and/or the operation data includes:
acquiring conventional operation data and conventional performance data of a to-be-detected high-voltage component;
if the matching degree value of the performance data and the conventional performance data is larger than or equal to a first preset value, and the matching degree value of the operation data and the conventional operation data is larger than or equal to a second preset value, determining that the anti-interference capability degree value of the to-be-detected high-voltage component is a first capability degree value; or; if the matching degree value of the performance data and the conventional performance data is smaller than or equal to a third preset value or the matching degree value of the operation data and the conventional operation data is smaller than or equal to a fourth preset value, determining that the anti-interference capability degree value of the to-be-detected high-voltage component is a second capability degree value; wherein the first capacity level value is greater than the second capacity level value.
In another aspect, the present application provides an apparatus for evaluating capability of anti-ripple interference, including:
the sampling module is used for acquiring ripple noise data of the interference source;
the fitting module is used for processing the ripple noise data to obtain a mathematical model of the waveform to be fitted;
the modulation module is used for modulating signals according to the mathematical model to obtain a fitting waveform;
the injection module is used for injecting fitting waveforms into the high-voltage component to be tested;
the determining module is used for acquiring performance data and/or operation data output by the high-voltage component to be detected, and determining the anti-interference capacity degree value of the high-voltage component to be detected based on the performance data and/or the operation data.
Optionally, the sampling module comprises a high-voltage power supply, a power supply impedance stabilizing network, a high-voltage bus, an oscilloscope and a high-voltage differential probe;
the first input end of the power supply impedance stabilizing network is connected with the high-voltage power supply, and the first output end of the power supply impedance stabilizing network is connected with the interference source through the high-voltage bus when being used for sampling;
one end of the high-voltage differential probe is connected with the oscilloscope, and the other end of the high-voltage differential probe is respectively connected with the second output end of the power impedance stabilizing network.
Optionally, the sampling module further comprises a high-voltage power supply load;
the high-voltage power supply load is connected across the positive and negative ends of the high-voltage power supply, and is positioned between the high-voltage power supply and the power supply impedance stabilizing network.
Optionally, the modulation module includes a signal source; the injection module comprises a high-voltage power supply, a power supply impedance stabilizing network, a high-voltage bus, an oscilloscope and a high-voltage differential probe;
the signal source is connected with the second input end of the power impedance stabilizing network, and the first output end of the power impedance stabilizing network is also used for being connected with the high-voltage component to be tested through the high-voltage bus during testing.
Optionally, the injection module further comprises a balun transformer;
one end of the balun transformer is connected with the signal source, and the other end of the balun transformer is connected with the positive and negative ends of the second input end of the power impedance stabilizing network in a bridging mode.
On the other hand, the application provides an evaluation system for the capability of resisting ripple interference, which comprises the evaluation device, an interference source and a high-voltage component to be tested.
The evaluation method, the device and the system for the anti-ripple interference capability have the following beneficial effects:
obtaining ripple noise data of an interference source; processing the ripple noise data to obtain a mathematical model of the waveform to be fitted; modulating signals according to a mathematical model to obtain a fitting waveform; injecting fitting waveforms into the high-voltage component to be tested; acquiring performance data and/or operation data output by a high-voltage component to be detected; a tamper resistance level value of the high voltage component to be tested is determined based on the performance data and/or the operational data. Therefore, the problem that the influence of the ripple noise on the high-voltage component cannot be estimated can be solved, and an estimation scheme is provided for the ripple noise immunity of the high-voltage component.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for evaluating anti-ripple interference capability according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an apparatus for evaluating anti-ripple interference capability according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a sampling module according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an injection module according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural view of another injection module according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural view of another injection module according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a target fitting waveform provided by an embodiment of the present application;
FIG. 8 is a schematic diagram of an output waveform of a second output terminal of a power impedance stabilization network according to an embodiment of the present disclosure;
reference numerals illustrate:
1-a high voltage power supply; 2-a power supply impedance stabilizing network; 3-high voltage bus; 4-oscilloscopes; 5-a high-voltage differential probe; 6-signal source; 7-a high-voltage component to be tested; 8-high voltage power supply load; a 9-balun transformer; 10-calibrating resistance; 11-interference source.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to solve the problem that the influence of ripple noise on high-voltage components in a vehicle cannot be estimated, the method, the device and the system for estimating the anti-ripple interference capability provided by the embodiment of the application can accurately estimate the influence of the ripple noise on the components to be measured by extracting the ripple noise and then injecting the ripple noise into the components to be measured, can also be used for estimating the anti-interference capability of the components to be measured on high-voltage transient noise, provide a new means for estimating electromagnetic compatibility of a high-voltage system, improve test correction efficiency and reduce test cost and correction cost.
In the following, a specific embodiment of a method for evaluating the capability of resisting ripple interference according to the present application is described, and fig. 1 is a schematic flow chart of a method for evaluating the capability of resisting ripple interference according to the embodiment of the present application, where the method according to the present application provides the steps of operation of the method according to the embodiment or the flowchart, but may include more or less steps based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. As shown in fig. 1, the method may include:
s101: and acquiring ripple noise data of the interference source.
In the embodiment of the application, the ripple noise data includes one or more of the frequency, amplitude or internal oscillation frequency of the noise waveform of the interference source; the interference source comprises one or more of an electric drive system, an on-vehicle charger, a direct current power supply converter, an on-vehicle heater, an air conditioner compressor or a high-voltage battery; the interference source is a component which can actually influence the high-voltage component to be detected in the whole vehicle environment.
In an alternative embodiment for acquiring ripple noise data of an interference source, the method includes: and performing time domain signal sampling on the ripple noise generated by the interference source to obtain one or more of the frequency, amplitude or internal oscillation frequency of the noise waveform.
In addition, when a plurality of interference sources exist, each interference source can be independently sampled to obtain noise data of each interference source, and then the following steps S103-S111 are respectively executed on the noise data of each interference source, so that the anti-interference capability of the high-voltage component to be detected on each interference source can be determined; or, integrating noise data of a plurality of interference sources, executing steps S103-S111 once, and simulating the anti-interference capability of the high-voltage component to be tested in the actual environment when the plurality of interference sources work simultaneously.
Further, in the process of integrating the noise data of the plurality of interference sources, the position relationship between each interference source and the to-be-detected high-voltage component in the whole vehicle environment is considered, and because the influence of the interference source on the to-be-detected high-voltage component can be reduced under the farther position relationship, one or more of the frequency, the amplitude or the internal oscillation frequency of the noise waveforms of the different interference sources can be adjusted according to different position relationships, so that the noise data which is more in line with reality is obtained.
S103: and processing the ripple noise data to obtain a mathematical model of the waveform to be fitted.
S105: and carrying out signal modulation according to the mathematical model to obtain a fitting waveform.
S107: and injecting a fitting waveform into the high-voltage component to be tested.
In the embodiment of the application, the ripple noise data are processed, including mathematical modeling, so as to obtain a mathematical model of the waveform to be fitted, wherein the mathematical model comprises a time domain formula and parameters of the ripple noise data; then signal modulation is carried out according to the mathematical model, and programmable waveform generation is carried out to generate fitting waveform; and then injecting a fitting waveform into the high-voltage component to be tested.
In an alternative implementation manner, the frequency, amplitude, internal oscillation frequency and the like of the noise waveform of the interference source are combined, a Curve filtering module in matlab software is used for carrying out data Fitting, mathematical modeling is carried out, a mathematical expression of the ripple noise interference signal is obtained, and signal modulation is carried out according to the mathematical expression, so that a Fitting waveform is obtained.
In an alternative embodiment, after step S105, before step S107, in order to make the injected fitting waveform coincide with the ripple noise data actually generated by the interference source, the method may further include: s106, calibrating the fitting waveform. And injecting the calibrated fitting waveform into the high-voltage component to be tested.
S109: and acquiring performance data and/or operation data of the output of the high-voltage component to be detected.
S111: a tamper resistance level value of the high voltage component to be tested is determined based on the performance data and/or the operational data.
In the embodiment of the application, in order to evaluate the influence of ripple noise on the to-be-detected high-voltage component, the performance data and/or the operation data output by the to-be-detected high-voltage component are obtained, and the anti-interference capability degree value of the to-be-detected high-voltage component is determined based on the performance data and/or the operation data. The operation data may include communication data of the high-voltage component to be detected, and the performance data may include bus voltage, output current and the like.
In an alternative embodiment, the step S111 may include:
acquiring conventional operation data and conventional performance data of a to-be-detected high-voltage component;
if the matching degree value of the performance data and the conventional performance data is larger than or equal to a first preset value, and the matching degree value of the operation data and the conventional operation data is larger than or equal to a second preset value, determining that the anti-interference capability degree value of the to-be-detected high-voltage component is a first capability degree value;
or; if the matching degree value of the performance data and the conventional performance data is smaller than or equal to a third preset value or the matching degree value of the operation data and the conventional operation data is smaller than or equal to a fourth preset value, determining that the anti-interference capability degree value of the to-be-detected high-voltage component is a second capability degree value; wherein the first capacity level value is greater than the second capacity level value.
Specifically, conventional operation data and conventional performance data can be obtained when the high-voltage component to be tested is in an electromagnetic interference-free environment; matching the performance data output by the high-voltage part to be detected with the conventional performance data, simultaneously matching the operation data output by the high-voltage part to be detected with the conventional operation data, then comparing the matching degree value of the performance data and the conventional performance data with the first preset value, and simultaneously comparing the matching degree value of the operation data and the conventional operation data with the second preset value; here, it is assumed that the range of the capability level values is [0,1], the first preset value and the second preset value are both 0.9, the third preset value and the fourth preset value are both 0.6, the first capability level value is 1, and the second capability level value is 0; when the matching degree value of the performance data and the conventional performance data is more than or equal to 0.9 and the matching degree value of the operation data and the conventional operation data is more than or equal to 0.9, determining that the anti-interference capability degree value of the high-voltage component to be tested is 1; and determining that the interference resistance degree value of the to-be-detected high-voltage component is 0 as long as the matching degree value of the performance data and the conventional performance data is less than or equal to 0.6 or the matching degree value of the operation data and the conventional operation data is less than or equal to 0.6.
It should be noted that, the anti-noise level of the high-voltage component to be detected can be intuitively reflected by quantifying the anti-ripple interference capability, and the determination rule in the specific embodiment can be adjusted according to practical application.
On the other hand, the embodiment of the application also provides an evaluation device for anti-ripple interference capability, as shown in fig. 2, the device includes:
a sampling module 201, configured to obtain ripple noise data of an interference source;
the fitting module 202 is configured to process the ripple noise data to obtain a mathematical model of the waveform to be fitted;
the modulation module 203 is configured to perform signal modulation according to a mathematical model to obtain a fitting waveform;
an injection module 204, configured to inject a fitting waveform into the high-voltage component to be tested;
the determining module 205 is configured to obtain performance data and/or operation data output by the high-voltage component to be detected, and determine an anti-interference capability level value of the high-voltage component to be detected based on the performance data and/or the operation data.
The device and the method for evaluating the anti-ripple interference capability provided by the embodiment of the application can have the same technical effects based on the same application conception, and are not repeated here.
In an alternative embodiment, as shown in fig. 3, the sampling module 201 includes a high voltage power supply 1, a power impedance stabilization network 2, a high voltage bus 3, an oscilloscope 4, and a high voltage differential probe 5;
the first input end a of the power supply impedance stabilization network 2 is connected with the high-voltage power supply 1, and the first output end c of the power supply impedance stabilization network 2 is connected with the interference source 11 through the high-voltage bus 3 during sampling;
one end of the high-voltage differential probe 5 is connected with the oscilloscope 4, and the other end of the high-voltage differential probe 5 is respectively connected with the second output end d of the power impedance stabilizing network 2.
Specifically, before evaluating the capability of resisting the ripple interference of the high-voltage component to be detected, firstly, a sampling module 201 is built, specifically, a first input end a of a power supply impedance stabilizing network 2 is connected with the high-voltage power supply 1, a first output end c is connected with an interference source, so as to sample ripple noise data of the interference source 11, and the specific sampling process can refer to the above method embodiment; the power supply impedance stabilizing network 2 (Line Impedance Stabilization Network, LISN) may also be called an artificial power supply network, where the power supply impedance stabilizing network 2 may isolate radio wave interference, provide stable test impedance, and perform filtering function.
Specifically, the setting of the oscilloscope 4 may be referred to as follows: the sampling rate is taken as 50MS/S, and the principle of 5 times of the sampling bandwidth and the requirement of sampling precision are required to be met; the sampling time base is selected to be 50 mu s, so that waveforms of 3 to 5 periods can be clearly displayed on an oscilloscope interface; the coupling mode is AC coupling, and the AC coupling can obtain the ripple noise voltage value more accurately.
In an alternative embodiment, as shown in fig. 3, the sampling module 201 further comprises a high voltage power supply load 8;
the high-voltage power supply load 8 is connected across the positive and negative ends of the high-voltage power supply 1, and the high-voltage power supply load 8 is positioned between the high-voltage power supply 1 and the power supply impedance stabilizing network 2.
Specifically, one end of the high-voltage power supply load 8 is connected with the positive end of the high-voltage power supply 1 and the positive end of the first input end a of the power supply impedance stabilizing network 2, and the other end of the high-voltage power supply load 8 is connected with the negative end of the high-voltage power supply 1 and the negative end of the first input end a of the power supply impedance stabilizing network 2.
In an alternative embodiment, as shown in fig. 4, the modulation module 203 includes a signal source 6; the injection module 204 comprises a high-voltage power supply 1, a power supply impedance stabilizing network 2, a high-voltage bus 3, an oscilloscope 4 and a high-voltage differential probe 5;
the signal source 6 is connected to the second input terminal b of the power supply impedance stabilizing network 2, and the first output terminal c of the power supply impedance stabilizing network 2 is also used for being connected to the high voltage component 7 to be tested through the high voltage bus 3 during testing.
Specifically, after the sampling module 201 finishes sampling, the fitting module 202 processes the ripple noise data to obtain a mathematical model of the waveform to be fitted; then, a modulation module 203 and an injection module 204 are built, specifically, a first output end c of the power impedance stabilizing network 2 is connected with the high-voltage component 7 to be tested, the signal source 6 generates an interference waveform, the interference waveform is injected into the high-voltage component 7 to be tested through the power impedance stabilizing network 2 and the high-voltage bus 3, and finally, performance and state data of the high-voltage component 7 to be tested are monitored and analyzed through the oscilloscope 4 and the high-voltage differential probe 5, so that anti-ripple interference capability assessment of the high-voltage component 7 to be tested is completed. Before testing, the assessment device provided by the application needs to calibrate each instrument, so that all instruments are ensured to be in a normal working state, and the accuracy of testing is ensured.
In an alternative embodiment, the power supply impedance stabilizing network 2 comprises a first power supply impedance stabilizing sub-network and a second power supply impedance stabilizing sub-network;
the first power supply impedance stabilizing sub-network and the second power supply impedance stabilizing sub-network are identical in structure and symmetrically arranged.
Specifically, as shown in fig. 3 or 4, the first power supply impedance stabilizing sub-network includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a first inductor L1;
the first resistor R1, the first capacitor C1 and the first inductor L1 are connected in series, and the second resistor R2 and the second capacitor C2 are connected in parallel with the first resistor R1, the first capacitor C1 and the first inductor L1 after being connected in series;
one end of the second resistor R2 is a positive end of the first input end a of the power supply impedance stabilizing network 2, and the other end of the second resistor R2 is grounded; one end of the first inductor L1 connected with the first capacitor C1 is a positive end of the first output end C of the power supply impedance stabilizing network 2; one end of the first capacitor C1 connected with the first resistor R1 is a positive end of the second input end b of the power supply impedance stabilizing network 2.
Specifically, the second power supply impedance stabilizing sub-network includes a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, and a second inductor L2;
the third resistor R3, the third capacitor C3 and the second inductor L2 are connected in series, and the fourth resistor R4 and the fourth capacitor C4 are connected in parallel with the third resistor R3, the third capacitor C3 and the second inductor L2 after being connected in series;
one end of the fourth resistor R4 is a negative end of the first input end a of the power impedance stabilizing network 2, and the other end of the fourth resistor R4 is grounded; one end of the second inductor L2 connected with the third capacitor C3 is the negative end of the first output end C of the power supply impedance stabilizing network 2; the end of the third capacitor C3 connected to the third resistor R3 is the negative end of the second input terminal b of the power impedance stabilizing network 2.
In an alternative embodiment, the evaluation device further comprises a shielding box; the shielding cage is used for placing the power supply impedance stabilizing network 2.
In an alternative embodiment, as shown in fig. 3 or fig. 4, the sampling module 201 and the injection module 204 further include a fifth resistor R5 and a sixth resistor R6;
one end of the fifth resistor R5 is respectively connected with the signal source 6 and the positive end of the second input end b of the power impedance stabilizing network 2, and the other end of the fifth resistor R5 is grounded;
one end of the sixth resistor R6 is connected to the signal source 6 and the negative end of the second input terminal b of the power impedance stabilizing network 2, respectively, and the other end of the sixth resistor R6 is grounded.
Specifically, the resistance of the fifth resistor R5 and the sixth resistor R6 is 50Ω.
It should be noted that the structure of the injection module 204 shown in fig. 4 is used to detect the influence of the differential mode, and thus, in an alternative embodiment, the injection module 204 further includes the balun 9; the balun transformer 9 shunts the interference signal output by the signal source 6 to be injected into the positive and negative ends (HV+/HV-);
specifically, as shown in fig. 4, one end of the balun 9 is connected to the signal source 6, and the other end of the balun 9 is connected across the positive and negative ends of the second input terminal b of the power impedance stabilizing network 2.
If an evaluation device is used to detect the effect of the common mode, the balun 9 is not required, and the evaluation device is structured as shown in fig. 5.
In an alternative embodiment, as shown in fig. 6, the injection module 204 further comprises a calibration resistor 10, the calibration resistor 10 being connected to the first output c of the power supply impedance stabilizing network 2 via the high voltage bus 3.
Specifically, before the anti-ripple interference capability of the high-voltage component 7 to be detected is evaluated, a calibration resistor 10 is connected with the positive and negative ends of the first output end c of the power supply impedance stabilizing network 2 through the high-voltage bus 3, the oscilloscope 4 and the high-voltage differential probe 5 are connected with the second output end d of the power supply impedance stabilizing network 2, the interference waveform output by the signal source 6 is calibrated through the calibration resistor 10, and meanwhile, the waveform of the oscilloscope 4 is observed, so that the waveform of the second output end d is consistent with the ripple noise data actually generated by the interference source 11 as much as possible. For example, after calibration is performed by the calibration resistor 10, the target fitting waveform modulated by the signal source 6 is shown in fig. 7, and the waveform of the second output end d detected by the oscilloscope 4 is shown in fig. 8, so that the calibration resistor 10 can make the injected fitting waveform have higher consistency with the ripple noise data actually generated by the interference source 11.
On the other hand, the embodiment of the application also provides an evaluation system for the capability of resisting the ripple interference, which comprises the evaluation device, the interference source and the high-voltage component to be tested in any one of the optional embodiments.
The embodiment of the application provides an evaluation system for anti-ripple interference capability, and the device and method are based on the same application conception.
In summary, by extracting the ripple noise data and injecting the ripple noise data into the high-voltage components to be tested, the method, the device and the system for evaluating the anti-ripple interference capability can evaluate the influence of the ripple noise in the whole vehicle high-voltage system on each high-voltage component, and further achieve the purpose of evaluating the anti-ripple noise interference capability of each high-voltage component.
It should be noted that: the foregoing sequence of the embodiments of the present application is only for describing, and does not represent the advantages and disadvantages of the embodiments. And the foregoing description has been directed to specific embodiments of this specification. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results.
The foregoing description of the preferred embodiments of the present application is not intended to limit the invention to the particular embodiments of the present application, but to limit the scope of the invention to the particular embodiments of the present application.
Claims (8)
1. A method for evaluating anti-ripple interference capability, comprising:
acquiring ripple noise data of an interference source;
processing the ripple noise data to obtain a mathematical model of the waveform to be fitted;
performing signal modulation according to the mathematical model to obtain a fitting waveform;
injecting the fitting waveform into the high-voltage component to be tested;
acquiring performance data and/or operation data output by the high-voltage component to be tested;
determining an anti-interference capacity degree value of the high-voltage component to be tested based on the performance data and/or the operation data;
wherein the determining the anti-interference capability degree value of the high-voltage component to be tested based on the performance data and/or the operation data comprises the following steps:
acquiring conventional operation data and conventional performance data of the high-voltage component to be tested;
if the matching degree value of the performance data and the conventional performance data is larger than or equal to a first preset value, and the matching degree value of the operation data and the conventional operation data is larger than or equal to a second preset value, determining that the anti-interference capability degree value of the high-voltage component to be tested is a first capability degree value; or; if the matching degree value of the performance data and the conventional performance data is smaller than or equal to a third preset value or the matching degree value of the operation data and the conventional operation data is smaller than or equal to a fourth preset value, determining that the anti-interference capability degree value of the high-voltage component to be tested is a second capability degree value; wherein the first capacity level value is greater than the second capacity level value.
2. The method of claim 1, wherein the ripple noise data comprises one or more of a frequency, an amplitude, or an internal oscillation frequency of a noise waveform of the interferer; the interference source comprises one or more of an electric drive system, an on-vehicle charger, a direct current power supply converter, an on-vehicle heater, an air conditioner compressor or a high-voltage battery;
the obtaining ripple noise data of the interference source includes:
and sampling ripple noise generated by the interference source to obtain one or more of the frequency, amplitude or internal oscillation frequency of the noise waveform.
3. The method according to claim 1, wherein after the signal modulation according to the mathematical model is performed to obtain a fitting waveform, before the injecting the fitting waveform into the high voltage component to be tested, the method further comprises:
and calibrating the fitting waveform.
4. An apparatus for evaluating anti-ripple capability, comprising:
the sampling module is used for acquiring ripple noise data of the interference source;
the fitting module is used for processing the ripple noise data to obtain a mathematical model of the waveform to be fitted;
the modulation module is used for modulating signals according to the mathematical model to obtain fitting waveforms;
the injection module is used for injecting the fitting waveform into the high-voltage component to be tested;
the determining module is used for acquiring performance data and/or operation data output by the high-voltage component to be tested and determining an anti-interference capacity degree value of the high-voltage component to be tested based on the performance data and/or the operation data;
the sampling module comprises a high-voltage power supply, a power supply impedance stabilizing network, a high-voltage bus, an oscilloscope and a high-voltage differential probe;
the first input end of the power supply impedance stabilizing network is connected with the high-voltage power supply, and the first output end of the power supply impedance stabilizing network is connected with an interference source through the high-voltage bus when being used for sampling;
one end of the high-voltage differential probe is connected with the oscilloscope, and the other end of the high-voltage differential probe is respectively connected with the second output end of the power supply impedance stabilizing network.
5. The apparatus of claim 4, wherein the sampling module further comprises a high voltage power supply load;
the high-voltage power supply load is connected with the positive end and the negative end of the high-voltage power supply in a bridging mode, and the high-voltage power supply load is located between the high-voltage power supply and the power supply impedance stabilizing network.
6. The apparatus of claim 4, wherein the modulation module comprises a signal source; the injection module comprises the high-voltage power supply, the power supply impedance stabilizing network, the high-voltage bus, the oscilloscope and the high-voltage differential probe;
the signal source is connected with the second input end of the power supply impedance stabilizing network, and the first output end of the power supply impedance stabilizing network is also used for being connected with the high-voltage component to be tested through the high-voltage bus during testing.
7. The apparatus of claim 6, wherein the injection module further comprises a balun transformer;
one end of the balun transformer is connected with the signal source, and the other end of the balun transformer is connected with the positive and negative ends of the second input end of the power supply impedance stabilizing network in a bridging mode.
8. An evaluation system for the capability of resisting ripple interference, characterized by comprising an evaluation device according to any one of claims 4-7, the interference source and the high voltage component to be tested.
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