CN111157793B - Electric appliance and high-frequency impedance testing method and device thereof - Google Patents
Electric appliance and high-frequency impedance testing method and device thereof Download PDFInfo
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- CN111157793B CN111157793B CN202010033368.3A CN202010033368A CN111157793B CN 111157793 B CN111157793 B CN 111157793B CN 202010033368 A CN202010033368 A CN 202010033368A CN 111157793 B CN111157793 B CN 111157793B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
Abstract
The invention relates to an electric appliance and a method and a device for testing high-frequency impedance of the electric appliance, wherein the method comprises the steps of detecting an original signal emitted by the electric appliance to be tested; detecting a reference signal of an original signal after the original signal passes through a first-stage reference impedance, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges; and estimating the impedance range of the electric appliance to be tested according to the difference value of the original signal and each reference signal. The method has the advantages that the reference signal is detected under qualitative and quantitative conditions by independently detecting the original signal and respectively passing through the plurality of impedance elements which are connected in parallel and have different impedance ranges, so that the influence of the self state and the external environment on the electric appliance to be detected is avoided, and the test precision is improved; by improving the test precision, the impedance range tested by the device is accurately matched with the impedance of the transmission line, so that the conduction performance is ensured.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility testing, in particular to an electric appliance and a method and a device for testing high-frequency impedance of the electric appliance.
Background
The EMC test is also called electromagnetic compatibility (EMC), refers to the comprehensive evaluation of the interference level (EMI) and the anti-interference capability (EMS) of electronic products in the aspect of electromagnetic field, and is one of the most important indexes of product quality, and the measurement of the EMC consists of a test site and a test instrument. The EMC test aims at detecting the influence of electromagnetic radiation generated by an electrical product on a human body, a public place power grid and other electrical products which normally work.
At present, domestic appliances need to forcibly meet national standard EMC, therefore, every manufacturer increases EMI and EMS tests in experiments, wherein conduction is an important item in EMC tests, and the quality of the conduction performance is in different degrees of relation with the signal type, the signal path and the high-frequency impedance of a port.
The signal propagates along the transmission line, and because transient impedance on the line is easy to change, when high-frequency impedance before and after the node is unequal or the difference is large, a part of signal is reflected, and the other part of signal is distorted and continues to propagate. The phenomena of reflection and distortion cause gain or loss of a signal level, and once the gain or loss degree exceeds a noise voltage limit value, malfunction is easily triggered. Therefore, the internal impedance of the household appliance needs to be tested, and the impedance of the transmission line can be matched only by knowing the internal impedance of the household appliance, so that a lossless useful signal is obtained or an useless interference signal is suppressed.
In the prior art, the internal impedance of the household appliance is easily affected by the state of the household appliance and the external environment, for example, the internal impedance of the air conditioner is easily affected by the compressor, the fan, the current, the voltage and other factors to change, and also change under different electromagnetic environments. Therefore, the internal impedance of the household appliance is easily affected by the self state and the external environment, so that the testing precision is low, and the impedance of the transmission line cannot be accurately matched, thereby affecting the conductivity.
Disclosure of Invention
The invention mainly aims to provide an electric appliance and a method and a device for testing high-frequency impedance of the electric appliance, and aims to solve the technical problem that the internal impedance of the electric appliance is easily influenced by the self state and the working environment to cause low testing precision in the prior art.
In a first aspect, an embodiment of the present application provides a method for testing a high-frequency impedance of an electrical appliance, where the method includes: detecting an original signal emitted by an electric appliance to be detected; detecting a reference signal of an original signal after the original signal passes through a first-stage reference impedance, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges; the original signal passes through a plurality of impedance elements which are connected in parallel and have different impedance ranges to generate a plurality of reference signals, and the impedance range of the electric appliance to be tested is estimated according to the difference value of the original signal and each reference signal.
The step of estimating the impedance range of the electric appliance to be tested according to the difference value of the original signal and each reference signal comprises the following steps: comparing the difference values of the original signal and each reference signal, and acquiring a reference signal with the minimum difference value; and estimating the impedance range of the electric appliance to be tested according to the reference signal with the minimum difference.
Wherein, the impedance ranges of the impedance elements included in the reference impedances of all levels are mutually connected.
Wherein the method further comprises: judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, ending the test; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
The number of the impedance elements included in each level of reference impedance is M ^ N, wherein M is the number of the impedance elements included in the first level of reference impedance, and M is a natural number greater than 1; and N is the number of the reference impedance stages.
Wherein, the number of M is 3, and the number of N stages is 3.
In a second aspect, an embodiment of the present application provides a device for testing high-frequency impedance of an electrical appliance, the device including: the first detection module is used for detecting an original signal emitted by the electric appliance to be detected; the first detection module is used for detecting a reference signal of an original signal after the original signal passes through first-stage reference impedance, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges; and the presumption module is used for presuming the impedance range of the electric appliance to be measured according to the difference value of the original signal and each reference signal.
The presumption module comprises a comparison module and a presumption submodule: the comparison module is used for comparing the difference value of the original signal and each reference signal and obtaining the reference signal with the minimum difference value; and the estimation submodule is used for estimating the impedance range of the electric appliance to be detected according to the reference signal with the minimum difference value.
Wherein the apparatus further comprises: the judging module is used for judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, the test is finished; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
In a third aspect, an embodiment of the present application provides an electrical appliance, and the electrical appliance adopts the above-mentioned high-frequency impedance testing method.
Compared with the prior art, the invention has the following beneficial effects:
the method has the advantages that the reference signal is detected under qualitative and quantitative conditions by independently detecting the original signal and respectively passing through the plurality of impedance elements which are connected in parallel and have different impedance ranges, so that the influence of the self state and the external environment on the electric appliance to be detected is avoided, and the test precision is improved; and the impedance range of the electric appliance to be tested is estimated according to the difference value of the original signal and each reference signal, so that the estimated impedance range approaches to the actual impedance, and the test precision is further improved. By improving the test precision, the impedance range tested by the device is accurately matched with the impedance of the transmission line, so that the conduction performance is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a method for testing high-frequency impedance of an electrical appliance according to an embodiment of the present invention.
Fig. 2 is another flow chart of the method for testing the high-frequency impedance of the electric appliance according to the embodiment of the invention.
Fig. 3 is a block diagram of a device for testing high-frequency impedance of an electrical appliance according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in fig. 1, a method for testing high frequency impedance of an electrical appliance is provided. The method specifically comprises the following steps:
s102, detecting an original signal emitted by the electric appliance to be detected.
Specifically, an original signal emitted by the electric appliance to be tested is detected through a frequency spectrograph.
In the present embodiment, the high frequency means a frequency greater than 50 Hz.
In this embodiment, the electrical appliance to be tested is an electrical appliance that needs to meet the international EMC standard, and includes, but is not limited to, a refrigerator, a food freezer, a fan, an air conditioner, a washing machine, a water heater, a vacuum cleaner, a water dispenser, an electromagnetic oven, an electric oven, a microwave oven, and the like.
For example, if the electrical appliance to be tested is an air conditioner, the voltage signal emitted by the air conditioner is detected to be 5mV by the spectrometer, and therefore, the voltage of 5mV is used as the original signal.
And S104, detecting a reference signal of the original signal after the original signal passes through a first-stage reference impedance, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges.
Specifically, a reference signal of the original signal after passing through the first-stage reference impedance alone is detected by a frequency spectrograph.
For example, if the first stage reference impedance includes 3 impedance elements connected in parallel, wherein the impedance of the first impedance element is in the range of 0-30 Ω, the impedance of the second impedance element is in the range of 30-60 Ω, the impedance of the third impedance element is in the range of 60-90 Ω, the voltage with a 5mV raw signal is 30 mV for the first reference signal measured by the first impedance element, 4 mV for the second reference signal measured by the second impedance element, and 25 mV for the third reference signal measured by the third impedance element.
Preferably, the reference impedances of the respective stages include impedance elements whose impedance ranges are mutually connected. Alternatively, the impedance ranges of the impedance elements included in the reference impedances of the respective stages may be partially overlapped or separated from each other.
For example, if the impedance of the first impedance element is in the range of 0-30 Ω, the impedance of the second impedance element is in the range of 30-60 Ω, and the impedance of the third impedance element is in the range of 60-90 Ω, this is the case of mutual engagement. If the impedance of the first impedance element is in the range of 0-30 omega, the impedance of the second impedance element is in the range of 20-50 omega and the impedance of the third impedance element is in the range of 40-70 omega, this situation is partly overlapping. If the impedance of the first impedance element is in the range of 0-20 omega, the impedance of the second impedance element is in the range of 25-45 omega and the impedance of the third impedance element is in the range of 50-70 omega, this is separated from each other.
And S106, estimating the impedance range of the electric appliance to be tested according to the difference value of the original signal and each reference signal.
Specifically, the difference between the original signal and each reference signal is compared, the reference signal with the minimum difference is obtained, and the impedance range of the electric appliance to be tested is presumed according to the reference signal with the minimum difference.
For example, if the first-stage reference impedance includes 10 impedance elements connected in parallel, wherein the impedance range of the first impedance element is 0-10 Ω, the impedance range of the second impedance element is 10-20 Ω, the impedance range of the third impedance element is 20-30 Ω, the impedance range of the fourth impedance element is 30-40 Ω, the impedance range of the fifth impedance element is 40-50 Ω, the impedance range of the sixth impedance element is 50-60 Ω, the impedance range of the seventh impedance element is 60-70 Ω, the impedance range of the eighth impedance element is 70-80 Ω, the impedance range of the ninth impedance element is 80-90 Ω, and the impedance range of the tenth impedance element is 90-100 Ω. A voltage of 5mV as an original signal has a first reference signal of 20 mV measured by the first impedance element, a second reference signal of 25 mV measured by the second impedance element, a third reference signal of 28 mV measured by the third impedance element, a fourth reference signal of 4 mV measured by the fourth impedance element, a fifth reference signal of 4.5 mV measured by the fifth impedance element, a sixth reference signal of 10 mV measured by the sixth impedance element, a seventh reference signal of 25 mV measured by the seventh impedance element, an eighth reference signal of 30 mV measured by the eighth impedance element, a ninth reference signal of 40 mV measured by the ninth impedance element, and a tenth reference signal of 50 mV measured by the tenth impedance element. The difference between the original signal and the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth reference signals is 15 mV, 20 mV, 23 mV, 1 mV, 0.5 mV, 5mV, 20 mV, 25 mV, 35 mV, and 45 mV, respectively, so that the difference between the original signal and the fifth reference signal is minimal. Since the impedance range of the fifth reference signal is 40-50 Ω, according to the impedance change before and after and the signal transmission theory, the impedance range of the electric appliance to be tested can be presumed to be between 40-50 Ω.
In the embodiment, the matching degree of the electrical appliance to be tested and the reference impedance is reflected by the quality of signal transmission. When the difference value between the original signal and the reference signal is smaller, the signal transmission quality is better, the matching degree between the electric appliance to be tested and the reference impedance is higher, and the impedance range of the reference impedance is close to the actual impedance of the electric appliance to be tested. When the difference value between the original signal and the reference signal is larger, the signal transmission quality is poor, the matching degree between the electric appliance to be tested and the reference impedance is lower, and the impedance range of the reference impedance is far different from the actual impedance of the electric appliance to be tested.
In the embodiment, the reference signal is detected under qualitative and quantitative conditions by separately detecting the original signal and respectively passing through the plurality of impedance elements which are connected in parallel and have different impedance ranges, so that the electric appliance to be tested is prevented from being influenced by the self state and the external environment, and the test precision is improved; and the impedance range of the electric appliance to be tested is estimated according to the difference value of the original signal and each reference signal, so that the estimated impedance range approaches to the actual impedance, and the test precision is further improved. By improving the test precision, the impedance range tested by the device is accurately matched with the impedance of the transmission line, so that the conduction performance is ensured.
In this embodiment, the method specifically includes the following steps:
judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, ending the test; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
For example, if the first stage reference impedance includes 3 impedance elements connected in parallel, wherein the impedance of the first impedance element is in the range of 0-30 Ω, the impedance of the second impedance element is in the range of 30-60 Ω, the impedance of the third impedance element is in the range of 60-90 Ω, the voltage with a 5mV raw signal is 30 mV for the first reference signal measured by the first impedance element, 4 mV for the second reference signal measured by the second impedance element, and 25 mV for the third reference signal measured by the third impedance element. The difference values of the original signal and the first reference signal, the second reference signal and the third reference signal are respectively 25 mV, 1 mV and 20 mV, so that the difference value of the original signal and the second reference signal is minimum, and the impedance range of the electric appliance to be tested can be estimated to be 30-60 omega. If the impedance range of the first-stage reference impedance conjecture meets the precision requirement, the test is ended. And if the impedance range presumed by the first-stage reference impedance does not meet the precision requirement, detecting the reference signal after the original signal passes through the second-stage reference impedance alone.
If the second stage reference impedance comprises 3 impedance elements connected in parallel, wherein the impedance of the fourth impedance element is in the range of 30-40 Ω, the impedance of the fifth impedance element is in the range of 40-50 Ω, the impedance of the sixth impedance element is in the range of 50-60 Ω, the voltage with 5mV of raw signal is 4.1 mV of the fourth reference signal measured by the fourth impedance element, 4.5 mV of the fifth reference signal measured by the fifth impedance element, and 4.7 mV of the sixth reference signal measured by the sixth impedance element. The difference values of the original signal and the fourth reference signal, the fifth reference signal and the sixth reference signal are respectively 0.9 mV, 0.5 mV and 0.3 mV, so that the difference value of the original signal and the sixth reference signal is minimum, and the impedance range of the electric appliance to be tested can be presumed to be between 50 and 60 omega. If the impedance range of the second stage reference impedance conjecture reaches the precision requirement, the test is ended. And if the impedance range presumed by the second-stage reference impedance does not meet the precision requirement, detecting the reference signal of the original signal after independently passing through the third-stage reference impedance.
If the third stage reference impedance includes 3 impedance elements connected in parallel, wherein the impedance of the seventh impedance element is in the range of 50-53 Ω, the impedance of the eighth impedance element is in the range of 53-57 Ω, the impedance of the ninth impedance element is in the range of 57-60 Ω, the voltage with 5mV as the original signal is 4.9 mV as the seventh reference signal measured by the seventh impedance element, 4.85 mV as the eighth reference signal measured by the eighth impedance element, and 4.8 mV as the ninth reference signal measured by the ninth impedance element. The difference values of the original signal and the seventh reference signal, the difference values of the eighth reference signal and the difference values of the ninth reference signal are respectively 0.1 mV, 0.25 mV and 0.2 mV, so that the difference value of the original signal and the seventh reference signal is minimum, the impedance range of the electric appliance to be tested can be presumed to be between 50 and 53 omega, and the rest can be done in sequence.
In this embodiment, each stage of reference impedance includes M ^ N impedance elements, where M is the number of impedance elements included in the first stage of reference impedance, and M is a natural number greater than 2; and N is the number of the reference impedance stages. Preferably, both M and N are 3. Optionally, the number of M and N is not limited to 3, which is determined according to the actual situation.
In the embodiment, the impedance range of the electric appliance to be tested can be quickly positioned by comparing the difference values of the original signal and each reference signal through channel division step by step, so that the presumed impedance range is quickly close to the actual impedance, and the testing speed and the testing precision are improved.
As shown in fig. 2, in an embodiment, a method for testing high-frequency impedance of an electrical appliance is provided, which specifically includes the following steps:
the first step is as follows: and detecting an original signal emitted by the electric appliance to be detected.
The second step is that: and detecting the reference signal of the original signal after the original signal passes through the first-stage reference impedance alone.
The third step: and comparing the difference value of the original signal and the first-stage reference signal to obtain a reference signal with the minimum difference value.
The fourth step: and estimating the impedance range of the electric appliance to be tested according to the reference signal with the minimum first-stage difference value.
The fifth step: judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, ending the test; if not, the method goes to six steps.
And a sixth step: and detecting the reference signal of the original signal after the original signal passes through the second-stage reference impedance alone.
The seventh step: and comparing the difference value of the original signal and the second-stage reference signal to obtain a reference signal with the minimum difference value.
Eighth step: and estimating the impedance range of the electric appliance to be tested according to the reference signal with the minimum second-stage difference value.
The ninth step: judging whether the impedance range of the second-stage reference impedance conjecture meets the precision requirement, if so, ending the test; if not, entering ten steps.
The tenth step: and detecting the reference signal of the original signal after the original signal passes through the third-stage reference impedance alone.
It should be understood that the steps in the flowcharts are shown in order as indicated by the arrows, but the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in each flowchart may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
As shown in fig. 3, in one embodiment, a device 10 for testing high-frequency impedance of an electrical appliance is provided, which specifically includes the following: a first detection module 11, a second detection module 12 and a presumption module 13.
The first detection module 11 is configured to detect an original signal transmitted by an electrical appliance to be detected.
The second detection module 12 is configured to detect a reference signal after the original signal passes through a first-stage reference impedance alone, where the first-stage reference impedance includes a plurality of impedance elements connected in parallel and having different impedance ranges.
And the presumption module 13 is used for presuming the impedance range of the electric appliance to be tested according to the difference value between the original signal and each reference signal.
In this embodiment, the estimation module 13 specifically includes the following contents: a comparison module and a speculation submodule.
And the comparison module is used for comparing the difference values of the original signal and each reference signal and obtaining the reference signal with the minimum difference value.
And the estimation submodule is used for estimating the impedance range of the electric appliance to be detected according to the reference signal with the minimum difference value.
In this embodiment, the apparatus further includes the following contents: and a judging module.
The judging module is used for judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, the test is finished; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
It should be noted that, the specific implementation process of the device for testing high-frequency impedance of an electrical appliance according to the embodiment of the present invention is partially the same as the method for testing high-frequency impedance of an electrical appliance, and reference may be made to the method for embodiment specifically, and details are not described here again.
In one embodiment, a computer readable storage medium is provided, which stores a computer program, which, when executed by a processor, causes the processor to perform the steps of the above-mentioned method for testing the high frequency impedance of an electrical appliance. The steps of the method for testing the high-frequency impedance of the electric appliance may be the steps of the method for testing the high-frequency impedance of the electric appliance of the above embodiments.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the computer program, when executed by the processor, causing the processor to perform the steps of the above-mentioned method for testing the high frequency impedance of an electrical appliance. The steps of the method for testing the high-frequency impedance of the electric appliance may be the steps of the method for testing the high-frequency impedance of the electric appliance of the above embodiments.
The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the above description, for a person skilled in the art, there are variations on specific embodiments and application ranges according to the concepts of the embodiments of the present invention, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method for testing high-frequency impedance of an electric appliance is characterized by comprising the following steps:
detecting an original signal emitted by an electric appliance to be detected;
detecting a reference signal of an original signal after the original signal passes through first-stage reference impedance, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges, and the reference signal comprises a plurality of output signals which are generated by the original signal passing through a plurality of impedance elements which are connected in parallel and have different impedance ranges;
presume the impedance range of the electrical apparatus to be measured according to the difference of original signal and every reference signal;
the step of estimating the impedance range of the electric appliance to be tested according to the difference value of the original signal and each reference signal comprises the following steps:
comparing the difference values of the original signal and each reference signal, and acquiring a reference signal with the minimum difference value;
and estimating the impedance range of the electric appliance to be tested according to the reference signal with the minimum difference.
2. The test method according to claim 1, wherein the reference impedances of the respective stages include impedance elements whose impedance ranges are mutually connected.
3. The method of testing of claim 1, further comprising:
judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, ending the test; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
4. The test method according to claim 3, wherein each stage of reference impedance comprises M ^ N impedance elements, where M is the number of impedance elements included in the first stage of reference impedance, and M is a natural number greater than 2; and N is the number of the reference impedance stages.
5. The test method of claim 4, wherein M and N are both 3.
6. A device for testing high-frequency impedance of an electric appliance is characterized by comprising:
the first detection module is used for detecting an original signal emitted by the electric appliance to be detected;
the second detection module is used for detecting a reference signal of an original signal after the original signal passes through first-stage reference impedance independently, wherein the first-stage reference impedance comprises a plurality of impedance elements which are connected in parallel and have different impedance ranges, and the reference signal comprises a plurality of output signals which are generated by the original signal passing through a plurality of impedance elements which are connected in parallel and have different impedance ranges respectively;
the estimation module is used for estimating the impedance range of the electric appliance to be detected according to the difference value of the original signal and each reference signal;
the speculation module comprises a comparison module and a speculation submodule:
the comparison module is used for comparing the difference value of the original signal and each reference signal and obtaining the reference signal with the minimum difference value;
and the estimation submodule is used for estimating the impedance range of the electric appliance to be detected according to the reference signal with the minimum difference value.
7. The testing device of claim 6, wherein the device further comprises:
the judging module is used for judging whether the impedance range of the first-stage reference impedance conjecture meets the precision requirement, if so, the test is finished; if not, detecting a reference signal of the original signal after passing through the second-stage reference impedance, wherein the impedance range of the second-stage reference impedance is within the impedance range presumed by the first-stage reference impedance; and in the same way, judging whether the presumed impedance range of the Nth-level reference impedance meets the precision requirement, if so, finishing the test, and if not, detecting the reference signal of the original signal after independently passing through the Nth-level reference impedance, wherein the impedance range of the Nth-level reference impedance is within the presumed impedance range of the Nth-1-level reference impedance, and N is a natural number greater than 1.
8. An electric appliance characterized by using the method for testing high frequency impedance according to any one of claims 1 to 5.
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| CN202010033368.3A CN111157793B (en) | 2020-01-13 | 2020-01-13 | Electric appliance and high-frequency impedance testing method and device thereof |
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| CN202010033368.3A CN111157793B (en) | 2020-01-13 | 2020-01-13 | Electric appliance and high-frequency impedance testing method and device thereof |
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| EP1932006B1 (en) * | 2005-10-03 | 2014-04-23 | Wirescan AS | System and method for monitoring of electrical cables |
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