A method for testing noise of a charging host

Abstract

The present application relates to a kind of charging host noise testing method, including the maximum temperature speed of each charging module fan under the ambient temperature based on ambient temperature respectively calculated, the maximum temperature speed is adjusted by controlling charging module output voltage and charging module output current, so that the maximum temperature speed is greater than or equal to module fan maximum speed;Open adjustable charging load to carry out heat test, so as to obtain corresponding different system fan speed test value based on different module fan speed test value;Only open system fan and charging module fan, and based on the different module fan speed test value and the different system fan speed test value, the module fan speed of each charging module and the system fan speed of each system fan are set one by one, and the noise value group of charging host is tested based on standard noise test method when setting each group of test value.The present application can test the noise of charging host in laboratory by standard noise test method.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging piles, more particularly, to a method for testing noise of a charging host. BACKGROUND

[0002] With the trend of developing high-power DC charging piles, more or larger capacity fans are needed to discharge the heat generated in the piles, and the noise problem is becoming more and more serious, which greatly affects the charging experience, especially in the charging stations near residential areas, which often causes complaints. Although high-power charging piles have begun to use liquid-cooled charging modules to solve the problem of heat dissipation and noise, but due to the price reason, it is still in the initial stage, and the market mainstream still uses air-cooled charging module design to realize high-power charging.

[0003] The noise of the charging host designed with air-cooled charging module comes from the charging module itself and the system fan. The charging module is generally configured with a speed-regulating fan for heat dissipation, which can adjust the speed according to the environmental temperature, output voltage and output current. The single charging module is small in size and has few output parameter combinations, and the correlation data of fan speed and heat and noise can be measured in a conventional oven and laboratory. The charging host composed of multiple modules is large in size, and the oven in the conventional laboratory cannot be placed, and the output parameter combination is close to infinity. At the same time, the charging load will also emit noise after starting, and it is basically impossible to measure the noise value in the laboratory, which needs to be tested by a qualified certification agency. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a method for testing the noise of a charging host, which can test the noise of the charging host in the laboratory by standard noise testing methods by controlling the output voltage and the output current, in view of the above-mentioned defects of the prior art.

[0005] The technical scheme adopted by the present application to solve the technical problem is to construct a method for testing the noise of a charging host, comprising the following steps:

[0006] S1, based on the environmental temperature, the maximum temperature speed of the fan of each charging module under the environmental temperature is calculated, and the maximum temperature speed is adjusted by controlling the output voltage of the charging module and the output current of the charging module, so that the maximum temperature speed is greater than or equal to the maximum speed of the module fan;

[0007] S2, start the adjustable charging load to perform heat test, so as to obtain different system fan speed test values corresponding to different module fan speed test values;

[0008] S3. Only turn on the system fan and the charging module fan, and set the module fan speed of each charging module and the system fan speed of each system fan one by one based on the test values ​​of the different module fan speeds and the test values ​​of the different system fan speeds. Then, test the noise value of the charging host when setting each set of test values ​​based on the standard noise test method.

[0009] In the charging host noise testing method of the present invention, step S1 further includes the following steps:

[0010] S11. Obtain the ambient temperature;

[0011] S12. For each charging module fan, control the output power of its corresponding charging module to be constant, and obtain the maximum temperature speed under the ambient temperature based on different charging module output voltages and charging module output currents.

[0012] S13. Determine whether the maximum temperature speed is greater than or equal to the maximum speed of the module fan. If so, determine that the ambient temperature meets the noise test conditions and execute step S2; otherwise, execute step S14.

[0013] S14. Increase the ambient temperature and return to step S11.

[0014] In the charging host noise testing method of the present invention, step S12 includes the following steps:

[0015] S121. Based on the following formula, obtain multiple different charging module fan speeds corresponding to multiple sets of different charging module output voltages and charging module output currents under the ambient temperature:

[0016] r mkx =f r (T mkx V mkx I mkx )

[0017] Where, r mkx T represents the fan speed of the charging module. mkx This indicates the air inlet temperature of the charging module, V. mkx I represents the output voltage of the charging module. mkx f represents the output current of the charging module. r This is the first function expression;

[0018] S122. Obtain the maximum temperature speed from the multiple different charging module fan speeds.

[0019] In the charging host noise testing method of the present invention, step S1 further includes the following steps:

[0020] Determine the influence of the structure of the charging host on the heat dissipation of the system based on the ambient temperature and the charging port air inlet module temperature of each charging module.

[0021] In the charging host noise test method, the step S2 further comprises the following steps:

[0022] S21, set the charging module output voltage and the charging module output current of each charging module fan to the voltage value and the current value when the maximum temperature speed is greater than or equal to the maximum speed of the module fan;

[0023] S22, adjust the speed of the charging module fan of each charging module according to a set proportion step based on the maximum speed of the module fan, and set the speed of the system fan so that the air volume of the system fan is equal to the total air volume of the module, then start the adjustable charging load for heat test and adjust the speed of the system fan so that all charging modules are not derated to obtain corresponding multiple sets of test values of the speed of the module fan and the test values of the speed of the system fan.

[0024] In the charging host noise test method, the step S22 further comprises the following steps:

[0025] S221, set the speed of the charging module fan of each charging module to the maximum speed of the module fan, and set the speed of the system fan so that the air volume of the system fan is equal to the total air volume of the module;

[0026] S222, perform heat test on the adjustable charging load and adjust the speed of the system fan so that all charging modules are not derated to obtain the current set of test values of the speed of the module fan and the test values of the speed of the system fan;

[0027] S223, step adjust the maximum speed of the module fan, and repeatedly execute the step S221 and the step S222 multiple times to obtain multiple sets of test values of the speed of the module fan and the test values of the speed of the system fan.

[0028] In the charging host noise test method, in the step S221, the total air volume of the module Wherein N represents the number of charging modules, Q mkx = f q (r mkx ), represents the air volume of the charging module at the speed r mkx of the charging module fan, f q is a second function expression;

[0029] The air volume Q fan of the system fan = f rfan (r fan +r sys ), rfan This represents the initial rotational speed of the system fan, r. sys f represents the correction factor for the charging host. rfan This is the third function expression.

[0030] In the charging host noise testing method of the present invention, step S22 further includes the following steps:

[0031] S224. Plot a first curve based on the test values ​​of the multiple sets of charging module fan speed and the test values ​​of the system fan speed;

[0032] S225. Analyze the first curve to obtain the relationship f between the module fan speed and the system fan speed. fan :

[0033]

[0034] Where, r fanx Q represents the system fan speed. mk Q represents the total air volume of the module. mkx =f q (r mkx ), indicating the charging module at the charging module fan speed r. mkx The air volume at that time, f q The second function expression is given, where N represents the number of charging modules.

[0035] In the charging host noise testing method of the present invention, step S3 further includes the following steps:

[0036] S31. Plot a second curve based on the noise value set of the charging host, the test value of the module fan speed, and the test value of the system fan speed;

[0037] S32. Based on the second curve, obtain the relationship f between the noise value set and the module fan speed or the system fan speed. spl ;

[0038]

[0039] SPL sysx Represents the noise value group, r fanx Indicates the system fan speed, r mkx This indicates the module fan speed, N represents the number of charging modules, and f... q For the second function expression, f fan This expresses the relationship between the speed of the module fan and the speed of the system fan.

[0040] The method for testing the noise of the charging host described in this invention further includes the following steps:

[0041] S4, setting a system noise target, and based on the system noise target, adjusting the output current of each charging module according to the relationship f spl The target module air volume is obtained, and the output current of each charging module is adjusted based on the target air volume so that the actual module air volume and the target module air volume meet a set difference condition, thereby realizing noise control.

[0042] The test method for the noise of the charging host disclosed by the present application adjusts the rotating speed of the fan of the charging module by controlling the output voltage and the output current, thereby obtaining different test values of the rotating speed of the module fan and the rotating speed of the system fan, and the test values are used for the noise value test of the charging host, so that the noise value test of the charging host can be performed in the laboratory by using the standard noise test method. BRIEF DESCRIPTION OF DRAWINGS

[0043] The present application will be further described below in combination with the drawings and embodiments, and the drawings are as follows:

[0044] Figure 1 is a logic block diagram of the charging host to which the test method for the noise of the charging host disclosed by the present application is applicable;

[0045] Figure 2 is Figure 1 is a schematic diagram of the functional relationship between the rotating speed of the fan of the charging module and the air volume of the charging host shown in the figure;

[0046] Figure 3 is a flowchart of the preferred embodiment of the test method for the noise of the charging host disclosed by the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application will be further described in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0048] The noise of the charging host mainly comes from the fan of the charging module and the system fan. Since the rotating speed of the fan has an upper limit, that is, the noise has an upper limit. Therefore, the rotating speed of the fan can be changed from zero to not more than the upper limit in the laboratory by adjusting the output voltage and current parameters, creating high temperature conditions and the like, and thus the noise of the charging host under each working condition can be tested in the laboratory by using the standard noise test method. Based on the above idea, the present application proposes a test method for the noise of the charging host, which is applicable to the charging host as shown in Figure 1

[0049] Figure 1 ​​As shown, the charging host includes M system fans and N charging modules. Each charging module has a communication line leading to its host computer for communication. The computer reads and controls the output voltage, output current, and fan speed of the charging module. The system fan speed controller has a communication line leading to its host computer for communication, allowing the computer to read and control the system fan speed. Each charging module corresponds to a specific fan.

[0050] For adjustable-speed charging modules with modular fans, there exists a speed control strategy. While the speed control strategies of different charging module manufacturers may vary due to differences in structural design, they are generally related to the charging module's inlet temperature, output voltage, and output current. Therefore, the relationship is shown in Equation 1:

[0051] r mkx =f r (T mkx V mkx I mkx Formula 1

[0052] Where, r mkx T represents the fan speed of the charging module. mkx This indicates the air inlet temperature of the charging module, V. mkx I represents the output voltage of the charging module. mkx f represents the output current of the charging module. r The first function expression is the function expression provided by the charging module manufacturer for determining the fan speed based on the inlet temperature, output voltage, and output current. For example, Equation 1 can be written as r mkx =A Vmkx *I mkx +0.2*T mkx In the formula A Vmkx Based on the output voltage V of the charging module mkx The coefficients are determined to be 0.09 for the high-voltage section and 0.05 for the low-voltage section.

[0053] For a charging module with a defined structure, its wind resistance curve is fixed, meaning that there is a corresponding relationship between the air volume of the charging module and the fan speed, as shown in Equation 2:

[0054] Q mkx =f q (r mkx Formula 2

[0055] Where, r mkx Q represents the fan speed of the charging module. mkx This indicates the charging module's fan speed r. mkx The air volume at that time, f q The second function expression, namely the functional relationship between the charging module fan speed and the air volume provided by the charging module manufacturer, has a preferred implementation as follows:Figure 2 As shown.

[0056] Based on Equations 1 and 2 above, it can be seen that when the inlet air temperature, output voltage, and output current of the charging module are determined, the air volume of each charging module can be determined, as shown in Equation 3.

[0057] Q mkx =f q [f r (T mkx V mkx I mkx Formula 3

[0058] The total airflow of the charging host consisting of N charging modules is shown in Equation 4:

[0059]

[0060] Where N represents the number of charging modules, Q mkx =f q (r mkx ), indicating the charging module at the charging module fan speed r. mkx Air volume at that time.

[0061] For each system fan, since the system fan has already borne the outlet air pressure of the module fan of the charging module, it is assumed that the initial air volume of the system fan is the air volume when the static pressure is zero, which has a corresponding relationship with the system fan speed, expressed by Equation 5.

[0062] Q fan =f rfan (r fan +r sys Formula 5

[0063] Among them, Q fan r represents the system fan air volume. fan This represents the initial rotational speed of the system fan, r. sys This is a correction factor for the charging host, with an initial value of zero. The specific correction factor can be uniformly applied based on differences in the charging host structure, the mutual influence of heat radiation from multiple modules, and the varying heat radiation from internal components. This factor is provided by the charging host manufacturer. rfan The function expression for the system fan speed versus the system fan air volume is provided by the system fan manufacturer, and can be expressed as follows:

[0064] Q / Q0 = r / r0

[0065] Where r0 is the initial speed of the system fan, Q0 is the initial air volume of the system fan, r is the current speed of the system fan, and Q is the current air volume of the system fan.

[0066] After clarifying the relationship between the various parameters of the charging host, a detailed introduction is provided.Figure 3 The present invention provides a method for testing the noise of a charging host as follows. For example... Figure 3 As shown, in step S1, the maximum temperature speed of each charging module fan is calculated based on the ambient temperature, and the maximum temperature speed is adjusted by controlling the output voltage and output current of the charging module so that the maximum temperature speed is greater than or equal to the maximum speed of the module fan.

[0067] In a preferred embodiment of the present invention, a temperature probe can be used to read the ambient temperature of the laboratory. Then, for each charging module fan, the output power of its corresponding charging module can be controlled to be constant, and the maximum temperature rotation speed under the ambient temperature can be obtained based on different charging module output voltages and charging module output currents.

[0068] Specifically, in step S11, a temperature probe is used to read the laboratory ambient temperature T. en Then, in step S12, for each charging module fan, the output power of its corresponding charging module is controlled to be constant. Assuming the output power of the charging module is constant at P, according to P = UI, multiple sets of different charging module output voltages and currents can be set based on the charging module output power P. For each set of charging module output voltages and currents, they are substituted into Equation 1:

[0069] r mkx =f r (T mkx V mkx I mkx Formula 1

[0070] Where, r mkx T represents the fan speed of the charging module. mkx This indicates the air inlet temperature of the charging module, V. mkx I represents the output voltage of the charging module. mkx f represents the output current of the charging module. r This is the first function expression.

[0071] Based on the output voltage V of each charging module mkx and the output current I of the charging module mkx We can obtain a corresponding charging module fan speed r mkx Therefore, we can obtain the fan speed r of multiple charging modules. mkx Then from the fan speed r of these charging modules mkx Select the maximum value from the values ​​and use it as the maximum temperature rotation speed r under the ambient temperature. en .

[0072] Then in step S13, we will determine the maximum temperature rotation speed ren The maximum rotation speed r of the module fan of the charging module max The maximum rotation speed r of the module fan of the charging module en If the difference is greater than the allowed error range, it is determined that the structure of the charging host has a negative impact on heat dissipation, although it does not reduce the capacity, but the system fan speed needs to be increased, and the noise will be relatively increased.

[0073] Here, steps S11-S13 need to be repeatedly executed in turn until the environmental temperature meets the noise test condition, and then the test operation of subsequent step S2 can be performed.

[0074] In further preferred embodiments of the present application, the charging port inlet module temperature of each charging module can also be obtained before or after obtaining the environmental temperature, and then the influence of the charging host structure on system heat dissipation is determined based on the environmental temperature and the charging port inlet module temperature of each charging module. It should be noted that this determination step can be performed at any time, for example, before, during or after the maximum temperature rotation speed acquisition step (i.e. S11-S14), for example, before, during or after the module fan rotation speed test value and system fan rotation speed test value acquisition step (i.e. steps S21-S22, S221-S225 described below), and before, during or after the noise value group acquisition step (i.e. step S3 described below), and before, during or after the noise control step (step S4 described below).

[0075] In further preferred embodiments of the present application, the charging module inlet air temperature T mkx is compared with the environmental temperature T en If the difference is greater than the allowed error range, it is determined that the structure of the charging host has a negative impact on heat dissipation, although it does not reduce the capacity, but the system fan speed needs to be increased, and the noise will be relatively increased.

[0076] In further preferred embodiments of the present application, the charging module inlet air temperature T mkx of each charging module can also be compared, or the charging module inlet air temperature T mkx of each charging module is compared with the average value or the difference value, and if the difference of the charging module inlet air temperature T mkx of each charging module is less than the set threshold value, or the deviation from the average value is small, it indicates that the charging host structure design is uniform, and the heat dissipation of each module inlet is close, otherwise it indicates that the structure of the charging host has a negative impact on heat dissipation, although it does not reduce the capacity, but the system fan speed needs to be increased, and the noise will be relatively increased.

[0077] like Figure 3 As shown, in step S2, an adjustable charging load is activated to perform a thermal test, thereby obtaining different system fan speed test values ​​based on different module fan speed test values. Specifically, in step S21, the charging module output voltage and charging module output current of each charging module fan are set to the voltage and current values ​​when the maximum temperature and speed are greater than or equal to the maximum speed of the module fan. That is, the charging module host computer sets the charging module output voltage V based on the aforementioned steps. mkx and the output current I of the charging module mkx .

[0078] In step S22, the charging module fan speed of each charging module is adjusted according to a set ratio step based on the maximum speed of the module fan, and the system fan speed is set so that the system fan air volume is equal to the total air volume of the module. Then, the adjustable charging load is turned on to perform a thermal test and the system fan speed is adjusted so that all charging modules have no derating to obtain the corresponding multiple sets of module fan speed test values ​​and system fan speed test values.

[0079] Specifically, in a preferred embodiment of the present invention, in step S221, the rotational speed of the charging module fan of each charging module is set to the maximum rotational speed of the module fan, that is, the rotational speed r of the charging module fan is set to... mkx =Maximum speed of modular fan r max The system fan speed is adjusted so that the system fan air volume equals the total air volume of the module, that is, the system fan air volume Q is set to... fan =Total air volume of the module Q mk Based on equations 3 to 5 above, it can be seen that...

[0080] Q mkx =f q [f r (T mkx V mkx I mkx Formula 3

[0081]

[0082] Q fan =f rfan (r fan +r sys Formula 5

[0083] Then, step S222 is executed to perform a thermal test on the adjustable charging load and adjust the system fan speed to ensure that all charging modules have no derating, thereby obtaining the current set of charging module fan speed test values ​​and the system fan speed test values, thus obtaining the charging module fan speed value r. mkx and system fan speed value r fanxThe first set of values ​​(r) max r fan0 )

[0084] Then, step S233 is executed to adjust the maximum speed of the module fan in stages, and steps S221 and S222 are executed sequentially multiple times to obtain multiple sets of charging module fan speed test values ​​and system fan speed test values.

[0085] Specifically, for example, the maximum speed of the module fan is calculated according to d%r max Adjustment is made, that is, r is made mkx =r max -d%r max Then, this value is passed to step S221, and steps S221 and S222 are repeated to obtain the second set of charging module fan speed test values ​​and system fan speed test values, thus obtaining the charging module fan speed value r. mkx and system fan speed value r fanx The second set of values ​​(r) max -d%r max r fan1 Then r mkx =r max -2*d%r max Then, this value is passed to step S221, and steps S221 and S222 are repeated to obtain the third set of charging module fan speed test values ​​and system fan speed test values, thus obtaining the charging module fan speed value r. mkx and system fan speed value r fanx The second set of values ​​(r) max -2*d%r max r fan2 This process is repeated multiple times to obtain multiple sets of test values ​​for the charging module fan speed and the system fan speed. Here, d% can be adjusted according to actual accuracy requirements. The smaller the d value, the higher the accuracy. That is, the smaller the d value, the more test points there are, and the more accurate the expression of the relationship described above, which is formed by connecting the corresponding values ​​of each point, becomes. For values ​​falling between two points, the linear value of the nearest two points is used.

[0086] In a further preferred embodiment of the present invention, after obtaining multiple sets of charging module fan speed test values ​​and system fan speed test values, a first curve is plotted based on the multiple sets of charging module fan speed test values ​​and system fan speed test values; then, the relationship f between the module fan speed and the system fan speed can be obtained by analyzing the first curve. fan :

[0087]

[0088] Where, r fanxrepresents the system fan speed, Q mk represents the total air volume of the modules, Q mkx = f q (r mkx ), represents the air volume of the charging module at the charging module fan speed r mkx , f q is a second function expression, i.e. the function relationship between the charging module fan speed and the air volume provided by the charging module manufacturer, and its preferred embodiment is shown in Fig. 4; N represents the number of charging modules.

[0089] In step S3, we formally make the noise measurement, at this time only the system fan and the charging module fan are turned on, and the module fan speed of each charging module and the system fan speed of each system fan are set one by one based on the different module fan speed test values and the different system fan speed test values, and the noise value group of the charging host is tested based on the standard noise test method when each test value group is set.

[0090] Specifically, in step S31, only the system fan and the charging module fan are turned on, and the adjustable charging load is not turned on, and then the module fan speed of each charging module and the system fan speed of each system fan are set one by one according to the different module fan speed test values and the different system fan speed test values obtained in the foregoing step S2, and then the noise number group SPL sysx of the charging host corresponding to each test value group is measured by the standard noise test method. sysx Then, the second curve is drawn based on the noise value group SPL spl of the charging host, the module fan speed test value and the system fan speed test value; through analyzing the second curve, the relationship f sysx of the noise value group and the module fan speed or the system fan speed can be obtained.

[0091]

[0092] wherein SPL fanx represents the noise value group, r mkx represents the system fan speed, and r spl represents the module fan speed, and N represents the number of charging modules.

[0093] In the preferred embodiment of the present application, the noise value groups of the front, rear, left and right of the charging host can be measured according to the standard noise test method. The standard noise test method is well known in the art, and will not be repeated here.

[0094] In the preferred embodiment of the present application, the smaller the value of d in the foregoing step, the more test points, and the more accurate the above relationship expressed by connecting the values corresponding to each point into a curve. For the values falling between two points, the linear values of the nearest two points are used.

[0095] In a further preferred embodiment of the present application, the noise testing method of the charging host of the present application can achieve noise control by adjusting the output current of the charging module, specifically as follows: setting a system noise target, and based on the system noise target, adjusting the output current of each charging module according to the relationship f spl to obtain a target module air volume, and based on the target module air volume, adjusting the output current of each charging module so that the actual module air volume and the target module air volume meet a set difference condition, thereby achieving noise control.

[0096] In a preferred embodiment of the present application, the system noise target can be set first According to the foregoing formula 7, the system noise target can be obtained The corresponding target module air volume

[0097]

[0098] where SPL sysx represents a set of noise values, r fanx represents the system fan speed, r mkx represents the module fan speed, f q is a second function expression, i.e., the function relationship between the fan speed and the air volume of the charging module provided by the manufacturer of the charging module, the preferred embodiment of which is shown in formula 2 as follows: Figure 2 N represents the number of charging modules.

[0099] After obtaining the target module air volume , by making the actual module air volume meet a set difference condition with the target module air volume , noise control can be achieved. Since the actual module air volume that can achieve noise control is known, f q is known, then the corresponding module fan speed r mkx that can achieve noise control is known, and based on the foregoing formula 1, r mkx = f r (T mkx , V mkx , I mkx ), by adjusting the output current I mkz of each charging module, the actual module air volume In other words, by adjusting the output current of the charging module or stopping part of the output current through the charging controller inside the charging unit, the actual air volume of the module can be adjusted. air volume of the target module By satisfying the set difference condition, noise control can be achieved.

[0100] The charging host noise testing method of the present invention can test the noise level of the charging pile in a conventional laboratory, based on the fan speed regulation strategy of the charging module itself and the speed adjustability of the system fan, and utilizing the principle that the total air output of the charging module can be substituted. Furthermore, the rationality of the charging host structural design can be analyzed based on the process data and results, and the system fan control strategy model and noise control method of the charging host can be determined.

[0101] Below, we use the aforementioned charging host noise testing method of this invention to test a 480kW charging host. This charging host includes 12 40kW charging modules. The control voltage of the module fans ranges from a maximum of 15V to a minimum of 3V. The system fan speed is controlled by PWM. The laboratory ambient temperature is approximately 30 degrees Celsius. Based on the typical function expression in Equation 1, and comparing different output voltages and currents, the maximum control voltage under this temperature condition is calculated to be 13.2V. The maximum temperature-speed is reached at the high-voltage range of 500V and the output current of 80A. However, at this point, the maximum temperature-speed is still less than the maximum speed of the module fans. Therefore, the charging host and adjustable charging load are placed in a closed or semi-closed laboratory space, and the ambient temperature is raised to approximately 40 degrees Celsius using the equipment's own heat. At this temperature, the maximum temperature-speed is greater than the maximum speed of the module fans. Here, tests can be conducted in increments of 0.5V or 1V based on the charging module output voltage until the maximum temperature-speed exceeds the maximum speed of the module fans, meaning the noise level is close to the ambient noise. The results are shown in Table 1.

[0102] Table 1

[0103]

[0104] An adjustable charging load was activated for thermal testing, resulting in different system fan speed test values ​​based on different module fan speed test values. Then, only the system fan and charging module fan were activated, and the module fan speed of each charging module and the system fan speed of each system fan were set one by one based on the different module fan speed test values ​​and the different system fan speed test values. The noise level of the charging host was tested for each set of test values ​​using a standard noise testing method. Here, the maximum speed of the module fan was adjusted in stages, resulting in multiple sets of charging module fan speed test values ​​and system fan speed test values, the results of which are shown in Table 2.

[0105] Table 2

[0106]

[0107] As mentioned earlier, a system noise target can be set according to actual needs, and noise control can be achieved by adjusting the output current of the charging module based on the system noise target.

[0108] The charging host noise testing method of this invention adjusts the speed of the charging module fan by controlling the output voltage and output current, thereby obtaining different module fan speed test values ​​and system fan speed test values, which are then used for charging host noise numerical testing. This allows the charging host noise numerical testing to be conducted in a laboratory using standard noise testing methods. Furthermore, the impact of the charging host structure on system heat dissipation can be determined based on temperature data during the testing process. Even further, the output current of the charging module can be adjusted according to the system noise target to achieve noise control.

[0109] Although the present invention has been described through specific embodiments, those skilled in the art will understand that various modifications and equivalent substitutions can be made to the invention without departing from its scope. Furthermore, various modifications can be made to the invention for specific situations or materials without departing from its scope. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for testing the noise of a charging host, characterized in that, Includes the following steps: S1. Calculate the maximum temperature speed of each charging module fan based on the ambient temperature, and adjust the maximum temperature speed by controlling the output voltage and output current of the charging module so that the maximum temperature speed is greater than or equal to the maximum speed of the module fan. S2. Turn on the adjustable charging load to perform thermal testing, thereby obtaining different system fan speed test values ​​based on different module fan speed test values. S3. Only turn on the system fan and the charging module fan, and set the module fan speed of each charging module and the system fan speed of each system fan one by one based on different module fan speed test values ​​and different system fan speed test values, and test the noise value of the charging host when setting each set of test values ​​based on the standard noise test method. Step S1 further includes the following steps: S11. Obtain the ambient temperature; S12. For each charging module fan, control the output power of its corresponding charging module to be constant, and obtain the maximum temperature speed under the ambient temperature based on different charging module output voltages and charging module output currents. S13. Determine whether the maximum temperature speed is greater than or equal to the maximum speed of the module fan. If so, determine that the ambient temperature meets the noise test conditions and execute step S2; otherwise, execute step S14. S14. Increase the ambient temperature and return to step S11; Step S12 includes the following steps: S121. Based on the following formula, obtain multiple different charging module fan speeds corresponding to multiple sets of different charging module output voltages and charging module output currents under the ambient temperature: in, This indicates the fan speed of the charging module. This indicates the air inlet temperature of the charging module. This indicates the output voltage of the charging module. This indicates the output current of the charging module. This is the first function expression; S122. Obtain the maximum temperature rotation speed from the plurality of different charging module fan speeds; Step S3 further includes the following steps: S31. Plot a second curve based on the noise value set of the charging host, the test value of the module fan speed, and the test value of the system fan speed; S32. Based on the second curve, obtain the relationship between the noise value set and the module fan speed or the system fan speed. ; = （ ）= { }； in Indicates a group of noise values. Indicates the system fan speed. This indicates the speed of the module fan, and N represents the number of charging modules. This is the second function expression. The formula representing the relationship between the speed of the module fan and the speed of the system fan; The method for testing the noise of the charging host further includes: S4. Set a system noise target, and based on the system noise target, apply the following formula: The target module air volume is obtained, and the output current of each charging module is adjusted based on the target air volume so that the actual module air volume and the target module air volume meet the set difference condition, thereby achieving noise control.

2. The method for testing the noise of the charging host according to claim 1, characterized in that, Step S1 further includes the following steps: The impact of the charging host's structure on system heat dissipation is determined based on the ambient temperature and the air intake module temperature of each charging module's charging port.

3. The method for testing the noise of the charging host according to claim 1, characterized in that, Step S2 further includes the following steps: S21. Set the output voltage and output current of each charging module fan to the voltage and current values ​​when the maximum temperature and speed are greater than or equal to the maximum speed of the module fan. S22. Based on the maximum speed of the module fan, adjust the speed of the charging module fan of each charging module according to a set ratio step, and set the system fan speed so that the system fan air volume is equal to the total air volume of the module. Then, turn on the adjustable charging load to perform a thermal test and adjust the system fan speed so that all charging modules have no derating to obtain the corresponding multiple sets of module fan speed test values ​​and system fan speed test values.

4. The method for testing the noise of the charging host according to claim 3, characterized in that, Step S22 further includes the following steps: S221. Set the fan speed of each charging module to the maximum speed of the module fan, and set the system fan speed so that the system fan air volume is equal to the total air volume of the module. S222. Perform a thermal test on the adjustable charging load and adjust the system fan speed to ensure that all charging modules have no derating, and obtain the current group of charging module fan speed test value and the system fan speed test value. S223. Adjust the maximum speed of the module fan in stages, and repeat steps S221 and S222 multiple times in sequence to obtain multiple sets of charging module fan speed test values ​​and system fan speed test values.

5. The method for testing the noise of the charging host according to claim 4, characterized in that, In step S221, the total air volume of the module = Where N represents the number of charging modules, This indicates the charging module's fan speed. Air volume at that time This is the second function expression; System fan air volume , Indicates the initial speed of the system fan. This represents the correction factor for the charging host. This is the third function expression.

6. The method for testing the noise of the charging host according to claim 4, characterized in that, Step S22 further includes the following steps: S224. Plot a first curve based on the test values ​​of the multiple sets of charging module fan speed and the test values ​​of the system fan speed; S225. Analyze the first curve to obtain the relationship between the module fan speed and the system fan speed. : = = in, Indicates the system fan speed. This indicates the total air volume of the module. This indicates the charging module's fan speed. Air volume at that time The second function expression is given, where N represents the number of charging modules.

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