A fast testing method and device for mobile phone fast charging adapter

Abstract

The present application relates to the technical field of mobile phone adapter testing, and specifically to a method and device for quickly testing a mobile phone fast charging adapter, the method comprising: determining a current difference index of a current signal; determining an adaptive cutoff frequency of a current signal based on the discreteness of all current values ​​of the current signal in each charging stage, and the current difference index combined with the change of all current values ​​of the current signal in each charging stage, and the distribution of the current signal frequency, so as to detect the output current of the mobile phone fast charging adapter. The present application obtains the adaptive cutoff frequency of the current signal by analyzing the load change and the electromagnetic interference intensity generated by the mobile phone fast charging adapter, so that the low-pass filter can adaptively adjust the filtering intensity to obtain accurate current data, thereby improving the test accuracy of the mobile phone fast charging adapter.

Description

Technical Field

[0001] The present application relates to the technical field of mobile phone adapter testing, and in particular to a method and device for quickly testing a mobile phone fast charging adapter. Background Art

[0002] Mobile phone fast charging technology has developed significantly in recent years, driven by improved smartphone performance and growing user demand. With the increasing capacity of mobile phone batteries and the increasing demand for faster charging, traditional charging methods are no longer sufficient for today's fast-paced lives. Fast charging adapters increase the voltage or current, significantly shortening charging times by allowing more power to be added to mobile phone batteries in a shorter period of time. With the widespread adoption of fast charging technology, a wide variety of fast charging adapters have emerged on the market, with varying degrees of performance and safety.

[0003] Therefore, developing a fast testing method and device for mobile phone fast charging adapters is of great practical significance for ensuring the performance and safety of fast charging adapters and improving the user experience. During the testing process of mobile phone fast charging adapters, electromagnetic interference is a common problem, which can lead to inaccurate test data. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a method and device for quickly testing a mobile phone fast charging adapter. The technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present application provides a method for quickly testing a mobile phone fast charging adapter, the method comprising the following steps:

[0006] Collect the current signal of the mobile phone fast charging adapter during the overall charging process within the sampling time, where the overall charging process includes multiple charging stages;

[0007] Determining a first current variation coefficient of the current signal based on differences between all current values ​​in the current signal and their average distribution, combined with a degree of dispersion of all current values ​​of the current signal in each charging stage;

[0008] determining a second current variation coefficient of the current signal based on variations of all current values ​​of the current signal in each charging stage;

[0009] Based on the distribution of all frequencies of the current signal in the frequency domain, the adaptive cutoff frequency of the current signal is determined in combination with the first current change coefficient and the second current change coefficient to detect the output current of the mobile phone fast charging adapter.

[0010] Preferably, the method for determining the first current variation coefficient of the current signal is:

[0011] determining a current difference index of the current signal according to differences between all current values ​​in the current signal and their average distribution;

[0012] Analyze the mean of the discrete degrees of the current signal in all charging stages, and record it as a first mean of the current signal;

[0013] A first current variation coefficient of the current signal is determined based on the first mean value and the current difference index.

[0014] Preferably, the current difference index of the current signal is determined by:

[0015] Each current value in the current signal that is greater than the current value at the adjacent sampling moments is recorded as the impact peak value of the current signal;

[0016] A current difference index of the current signal is determined based on a difference between all impulse peaks of the current signal in each charging stage and an average distribution of all current values ​​in the corresponding charging stage.

[0017] Preferably, determining the current difference index of the current signal based on the difference between all impulse peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage further includes:

[0018] Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage;

[0019] The current difference index of the current signal is a result of integrating the first current indices of the current signal in all charging stages.

[0020] Preferably, the first current variation coefficient of the current signal is the product of the first mean value of the current signal and the current difference index.

[0021] Preferably, the expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal is represented; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages. 、 They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

[0022] Preferably, the method for determining the adaptive cutoff frequency of the current signal is:

[0023] Analyze the normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal, and record it as the adjustment factor of the current signal;

[0024] The frequency corresponding to the minimum current value after the third quartile of all current values ​​of the current signal sorted from small to large is recorded as the starting frequency of the current signal;

[0025] An adaptive cutoff frequency of the current signal is determined based on the starting frequency of the current signal and the adjustment factor.

[0026] Preferably, the adaptive cutoff frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

[0027] Preferably, the detecting the output current of the mobile phone fast charging adapter includes:

[0028] The current signal and its adaptive cutoff frequency are used as the input of the low-pass filter, and the current signal with electromagnetic interference eliminated is output;

[0029] If the average of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified; otherwise, it is unqualified.

[0030] In a second aspect, an embodiment of the present application also provides a quick testing device for a mobile phone fast charging adapter, comprising a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the quick testing method for a mobile phone fast charging adapter described in any one of the above items are implemented.

[0031] This application has at least the following beneficial effects:

[0032] This application determines the first current variation coefficient of the current signal based on the difference between all current values ​​in the current signal and their average distribution, combined with the degree of discreteness of all current values ​​of the current signal in each charging stage, so as to more accurately evaluate and describe the impact of load changes on the electromagnetic interference intensity during the charging process, thereby filtering out the impact of electromagnetic interference caused by load changes on the mobile phone fast charging adapter test; determines the second current variation coefficient of the current signal based on the change of all current values ​​of the current signal in each charging stage, so as to accurately quantify the electromagnetic interference caused by the internal switching elements of the mobile phone fast charging adapter in the pre-charging stage and the constant voltage charging stage, thereby filtering out the impact of electromagnetic interference caused by the internal components of the mobile phone fast charging adapter on the mobile phone fast charging adapter test; determines the adaptive cutoff frequency of the current signal based on the distribution of the current signal frequency, combined with the first current variation coefficient and the second current variation coefficient; filters the current signal based on the adaptive cutoff frequency to obtain the detection result.

[0033] This application obtains the adaptive cutoff frequency of the current signal by analyzing the load changes and the electromagnetic interference intensity generated by the mobile phone fast charging adapter itself. It can adjust the filtering intensity according to the electromagnetic interference conditions under different test conditions to obtain accurate current data, thereby improving the test accuracy of the mobile phone fast charging adapter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 A flowchart of the steps of a quick testing method for a mobile phone fast charging adapter provided in this application;

[0036] Figure 2 Schematic diagram of the adaptive cutoff frequency extraction process provided by this application;

[0037] Figure 3 Schematic diagram of the output current detection process of the mobile phone fast charging adapter provided in this application. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by this application to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail a method and device for quickly testing a mobile phone fast charging adapter proposed in this application, its specific implementation, structure, features and effects. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0039] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0040] The following describes in detail a method and device for quickly testing a mobile phone fast charging adapter provided by the present application with reference to the accompanying drawings.

[0041] See also Figure 1 , which shows a flowchart of a method for quickly testing a mobile phone fast charging adapter provided by an embodiment of the present application, the method comprising the following steps:

[0042] Step S1: collecting the current signal of the mobile phone fast charging adapter during the test process and performing preprocessing.

[0043] The mobile phone fast-charging adapter under test was connected to a power source and a mobile phone, respectively, to simulate a real-world charging scenario. A magnetoelectric current sensor was used to collect the current signal throughout the charging process. The sampling period was the time it took for the phone's battery to charge from 10% to 100%, and the sampling frequency was a preset value. The collected current signal was baseline-corrected to avoid systematic bias.

[0044] It should be noted that the value of the sampling frequency, that is, the value of the preset value, is set manually. In this embodiment, the preset value is 1 kHz. The implementer can also set it according to the specific situation. This embodiment does not impose any special restrictions.

[0045] The baseline correction is a well-known technology, and the specific process of the correction is not described in detail here.

[0046] Step S2: determining a current difference index of the current signal according to differences between all current values ​​in the current signal and their average distribution.

[0047] During the test, electromagnetic interference will have a significant impact on the current signal. Electromagnetic interference refers to the electromagnetic field generated by the rapid changes in current during the operation of electrical or electronic equipment. These electromagnetic fields may have adverse effects on other equipment or signal transmission.

[0048] The mobile phone fast charging adapter should ensure stable output current and make timely adjustments if unexpected current changes occur. However, during actual use, as the mobile phone's battery level changes, the equivalent internal resistance of the mobile phone changes accordingly, and the change between the two is nonlinear, resulting in a nonlinear load on the mobile phone fast charging adapter. This will generate harmonics on the power line and form electromagnetic interference. This situation should be simulated during the test process. The magnitude of the electromagnetic interference can be characterized by the current change.

[0049] When using a mobile phone fast charging adapter, when its equivalent internal resistance increases, the charger's output current needs to be increased to ensure that the charger can provide sufficient current to charge the phone. However, to avoid possible damage to the battery due to excessive output current, the mobile phone fast charging adapter will automatically adjust and reduce the output current to ensure that it does not exceed the rated current. This process will cause a surge peak in the current signal. Therefore, based on the difference between all current values ​​in the current signal and its average distribution, the current difference index of the current signal is calculated, specifically:

[0050] The current value at each sampling moment in the current signal is compared with the current values ​​at the adjacent sampling moments before and after it, and the current value that is greater than the current value at the adjacent sampling moments before and after it is recorded as the impact peak value of the current signal.

[0051] Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage;

[0052] The current difference index of the current signal is a result of integrating the first current indices of the current signal in all charging stages.

[0053] It should be understood that fusion refers to combining two or more indicators through addition or multiplication to obtain a comprehensive indicator, thereby more comprehensively and accurately evaluating a phenomenon or problem. This fusion method is not limited to simple arithmetic operations and can also include more complex statistical models and analysis methods. Implementers can choose according to their specific circumstances and this embodiment does not impose any special restrictions.

[0054] Preferably, the impact factor of the current signal in this embodiment is the cumulative sum of the first current exponents of the current signal in all charging stages; in actual application, as other embodiments, the implementer may also use an exponential function value with a natural constant as the base and the cumulative result of the first current exponents of the current signal in all charging stages as the independent variable as the impact factor of the current signal.

[0055] The current difference index represents the cumulative result of current shock caused by the use of mobile phones during the charging process. The larger the value of the current difference index, the stronger the current shock effect, that is, the greater the nonlinear load change of the mobile phone fast charging adapter, the greater the electromagnetic interference intensity generated; on the contrary, the larger the value of the current difference index, the weaker the current shock effect, that is, the smaller the nonlinear load change of the mobile phone fast charging adapter, the smaller the electromagnetic interference intensity generated.

[0056] Step S3: determining a first current variation coefficient of the current signal according to the degree of dispersion of all current values ​​of the current signal in each charging stage and the current difference index.

[0057] Modern smartphones generally use lithium batteries as power sources. The characteristics of lithium batteries determine that their charging process is usually divided into three key stages: pre-charging stage, constant current charging stage and constant voltage charging stage.

[0058] Pre-charge phase: When the phone's battery is depleted, the charger first charges the lithium battery at a low, constant current. This phase is intended to gently activate the battery, gradually restoring its chemical activity and preparing it for subsequent fast charging.

[0059] Constant current charging: After the battery's activity is restored, the charger gradually increases the voltage, charging at a constant optimal current. This phase is the main part of the lithium battery charging process, during which the battery receives a rapid and efficient energy replenishment.

[0060] Constant Voltage Charging: When the battery charge approaches 80%, the charger switches to constant voltage mode, during which the current input gradually decreases. This is because the required charging current decreases as the battery charge increases. When the current drops below a set threshold, the charger deems the battery nearly fully charged, and the phone displays a full charge indication.

[0061] In different charging stages, the load of the mobile phone fast charging adapter is different, resulting in different speeds of current change. In order to eliminate the impact of the current change speed in different charging stages on electromagnetic interference, the first current change coefficient of the current signal is determined based on the discrete degree of all current values ​​of the current signal in each charging stage and the current difference index, so as to more accurately evaluate and describe the impact of load changes on the electromagnetic interference intensity during the charging process, thereby filtering out the impact of electromagnetic interference caused by load changes on the mobile phone fast charging adapter test. Specifically:

[0062] Analyze the discreteness of all current values ​​of the current signal in each charging stage;

[0063] It should be noted that there are many methods for measuring the degree of discreteness. In this embodiment, the standard deviation calculation method is used to measure the discreteness of all current values ​​of the current signal in each charging stage. The implementer may also use other methods for measuring the degree of discreteness such as variance, and this embodiment does not impose any special restrictions.

[0064] Furthermore, the mean of the discrete degrees of the current signal in all charging stages is analyzed and recorded as the first mean of the current signal;

[0065] The first current variation coefficient of the current signal is a result of fusing the current difference index of the current signal with the first mean value.

[0066] The average value of the discreteness of all current values ​​of the current signal in each charging stage represents the current fluctuation during the entire charging process. The first current variation coefficient characterizes the magnitude of the current change caused by the nonlinear load change during the charging process. The larger the value of the first current variation coefficient, the greater the current variation, so the electromagnetic interference caused by the current change will also be greater; conversely, the smaller the first current variation coefficient, the smoother the current fluctuation and the smaller the electromagnetic interference intensity.

[0067] Step S4: determining a second current variation coefficient of the current signal based on variations of all current values ​​of the current signal in each charging stage.

[0068] In addition to interference from external conditions, the internal components of the mobile phone fast charging adapter can also cause electromagnetic interference. The switching element is an important component of the mobile phone fast charging adapter. Its core function is to control the flow of current by quickly opening and closing, thereby generating the required current level at the output end. It usually appears in the form of transistors, MOSFETs or other types of semiconductor switching devices.

[0069] The electromagnetic interference caused by switching components can be determined by combining the current change rate during different charging stages with the switching frequency of the switching components. During the constant current charging stage, the mobile phone fast charging adapter provides a constant current to the phone until the battery is nearly fully charged. During this stage, the current remains essentially constant, but the voltage gradually increases to near the full battery voltage. Therefore, the electromagnetic interference caused by the constant current charging stage can be ignored.

[0070] During the pre-charging stage and the constant current charging stage, the fluctuation of the current signal is larger than that in the constant current charging stage. Therefore, the second current variation coefficient is calculated based on the current change rate in the pre-charging stage and the constant voltage charging stage to accurately quantify the electromagnetic interference caused by the internal switching elements of the mobile phone fast charging adapter in the pre-charging stage and the constant voltage charging stage, thereby filtering out the impact of the electromagnetic interference caused by the internal components of the mobile phone fast charging adapter on the mobile phone fast charging adapter test.

[0071] The expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal is represented; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages. 、 They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

[0072] It should be noted that the value of the switching frequency is set manually. The switching frequency of the mobile phone fast charging adapter is generally between tens of kilohertz and several megahertz. In this embodiment, the switching frequency of the mobile phone fast charging adapter is 50kHz. The implementer can also set it according to the specific situation. This embodiment does not impose any special restrictions.

[0073] The second current variation coefficient represents the magnitude of the electromagnetic interference caused by the switching elements inside the mobile phone fast charging adapter. The larger the value of the second current variation coefficient, the greater the electromagnetic interference caused during the pre-charging stage and constant-voltage charging stage of fast charging, and the stronger the interference to the current signal; conversely, the smaller the value of the second current variation coefficient, the smaller the electromagnetic interference caused during the pre-charging stage and constant-voltage charging stage of fast charging, and the weaker the interference to the current signal.

[0074] Step S5: determining an adaptive cutoff frequency of the current signal based on the frequency distribution of the current signal and in combination with the first current variation coefficient and the second current variation coefficient.

[0075] To eliminate the effects of electromagnetic interference, this embodiment uses a low-pass filter to filter out the high-frequency components of the current signal. Choosing the right cutoff frequency is crucial for filtering out noise. A lower cutoff frequency improves the filter's ability to suppress high-frequency noise, but it can also filter out high-frequency components of the useful signal. A higher cutoff frequency weakens the filter's ability to suppress high-frequency noise, but it can retain more of the signal's high-frequency components.

[0076] When selecting the cutoff frequency, a balance needs to be struck between filtering effectiveness and signal quality. A cutoff frequency that is too low may filter out useful signal components, while a cutoff frequency that is too high may not effectively filter out interference. Therefore, based on the frequency distribution of the current signal, combined with the first and second current variation coefficients, an adaptive cutoff frequency for the current signal is determined to ensure that electromagnetic interference is effectively suppressed while not significantly affecting signal quality. Specifically,

[0077] The collected current signal during the charging process of the mobile phone fast charging adapter is subjected to Fourier transform to convert the current signal from a time domain signal into a frequency domain signal.

[0078] The current value after the third quartile of all current values ​​of the current signal arranged from small to large is considered as the interference component, and the frequency corresponding to the minimum current value after the third quartile is recorded as the starting frequency of the current signal.

[0079] Further, a normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal is analyzed and recorded as an adjustment factor of the current signal;

[0080] The adaptive cutoff frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

[0081] The larger the values ​​of the first current variation coefficient and the second current variation coefficient, the greater the impact of electromagnetic interference on the internal components of the mobile phone fast charging adapter. The larger the value of the adjustment factor, the more it is necessary to increase the cutoff frequency of the low-pass filter to filter out the high-frequency noise of electromagnetic interference; conversely, the smaller the values ​​of the first current variation coefficient and the second current variation coefficient, the smaller the electromagnetic interference, and the cutoff frequency of the low-pass filter can be appropriately adjusted to filter out the high-frequency noise of electromagnetic interference.

[0082] Preferably, the schematic diagram of the adaptive cutoff frequency extraction process provided by this application is as follows: Figure 2 shown.

[0083] Step S6: Based on the current signal and its adaptive cutoff frequency, the output current of the mobile phone fast charging adapter is detected.

[0084] The adaptive cutoff frequency of the current signal is used as the parameter of the low-pass filter. A low-pass filter with set parameters is used to remove the high-frequency noise of the current signal during the charging process of the mobile phone fast charging adapter. The end of the low-pass filter is selected to be 4th order to provide sufficient attenuation rate while maintaining the response speed of the filter.

[0085] It should be noted that in this embodiment, the end of the low-pass filter is selected to be 4th order. The implementer can also select a low-pass filter of corresponding order according to the specific situation and in combination with the performance and feasibility of the filtering. This embodiment does not impose any special restrictions.

[0086] After filtering, the current signal with electromagnetic interference eliminated is obtained. This current signal is analyzed to determine whether the output current of the mobile phone fast charging adapter is qualified. Specifically:

[0087] If the average of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified; otherwise, the output current of the mobile phone fast charging adapter is unqualified.

[0088] It should be noted that the value of the preset range is artificially specified, and the fluctuation range of the output current of a qualified mobile phone fast charging adapter is very small, so the value of the preset range in this embodiment is the value of the mobile phone fast charging adapter. The implementer can also set it according to the specific situation, and this embodiment does not make any special limitations.

[0089] At this point, based on the adaptive cutoff frequency of the current signal, a low-pass filter is used to remove high-frequency noise in the current signal, eliminate the influence of electromagnetic interference, and complete the detection of the output current of the mobile phone fast charging adapter charger.

[0090] Preferably, the schematic diagram of the mobile phone fast charging adapter output current detection process provided by this application is as follows Figure 3 shown.

[0091] Based on the same inventive concept as the above method, an embodiment of the present application also provides a quick testing device for a mobile phone fast charging adapter, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned methods for quick testing a mobile phone fast charging adapter are implemented.

[0092] It should be noted that the order in which the embodiments of the present application are presented is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. Furthermore, the foregoing descriptions of specific embodiments of this specification are provided. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0093] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0094] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A quick test method for a mobile phone fast charging adapter, characterized in that: The method comprises the following steps: Collect the current signal of the mobile phone fast charging adapter during the overall charging process within the sampling time, wherein the overall charging process includes multiple charging stages; Determine a first current variation coefficient of the current signal according to the difference between all current values ​​in the current signal and their average distribution, combined with the degree of dispersion of all current values ​​of the current signal in each charging stage; Determining a second current variation coefficient of the current signal based on the variation of all current values ​​of the current signal in each charging stage; Based on the distribution of all frequencies of the current signal in the frequency domain, the adaptive cutoff frequency of the current signal is determined in combination with the first current variation coefficient and the second current variation coefficient to detect the output current of the mobile phone fast charging adapter; The method for determining the first current variation coefficient of the current signal is: Determine a current difference index of the current signal according to the difference between all current values ​​in the current signal and their average distribution; Analyze the mean of the discrete degrees of the current signal in all charging stages, and record it as the first mean of the current signal; A first current variation coefficient of the current signal is determined based on the first mean value and the current difference index.

2. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The method for determining the current difference index of the current signal is: Each current value in the current signal that is greater than the current value at the adjacent sampling moments before and after is recorded as the impact peak value of the current signal; Based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage, a current difference index of the current signal is determined.

3. A quick test method for a mobile phone fast charging adapter as claimed in claim 2, characterized in that: The determining of the current difference index of the current signal based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage further includes: Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage; The current difference index of the current signal is a result of integrating the first current indexes of the current signal in all charging stages.

4. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The first current variation coefficient of the current signal is a product of a first mean value of the current signal and a current difference index.

5. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages, , They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

6. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The method for determining the adaptive cut-off frequency of the current signal is: Analyze the normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal, and record it as the adjustment factor of the current signal; The frequency corresponding to the minimum current value after the third quartile of all current values ​​of the current signal sorted from small to large is recorded as the starting frequency of the current signal; An adaptive cutoff frequency of the current signal is determined based on the start frequency of the current signal and the adjustment factor.

7. A quick test method for a mobile phone fast charging adapter as claimed in claim 6, characterized in that: The adaptive cut-off frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

8. A quick test method for a mobile phone fast charging adapter as claimed in claim 5, characterized in that: The detecting of the output current of the mobile phone fast charging adapter includes: The current signal and its adaptive cut-off frequency are used as the input of the low-pass filter, and the current signal with electromagnetic interference eliminated is output; If the average value of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified, otherwise it is unqualified.

9. A fast testing device for a mobile phone fast charging adapter, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of a quick testing method for a mobile phone fast charging adapter as described in any one of claims 1-8 are implemented.

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