Method for testing noise of charging host

Abstract

The invention relates to a method for testing noise of a charging host, which comprises the following steps of: respectively calculating the maximum temperature rotating speed of each charging module fan under the environment temperature based on the environment temperature, and adjusting the maximum temperature rotating speed by controlling the output voltage and the output current of the charging module. The maximum temperature rotating speed is larger than or equal to the maximum rotating speed of the module fan; starting an adjustable charging load to carry out a thermal test so as to obtain corresponding different system fan rotating speed test values based on different module fan rotating speed test values; only starting a system fan and a charging module fan, and setting the module fan rotating speed of each charging module and the system fan rotating speed of each system fan one by one based on the different module fan rotating speed test values and the different system fan rotating speed test values; and testing a noise value group of the charging host when each group of test values is set based on a standard noise test method. According to the invention, the noise of the charging host can be tested in a laboratory through a standard noise testing method.

Description

Technical Field

[0001] The present invention relates to the field of charging piles, and more specifically, to a method for testing the noise of a charging host. Background Art

[0002] As DC charging piles develop towards high power, the heat generated in the piles needs more or larger fans to be discharged, and the noise problem that arises is becoming more and more serious, greatly affecting the charging experience, especially charging stations near residential areas, which often cause complaints. Although high-power charging piles have begun to use liquid-cooled charging modules to solve heat dissipation and noise problems, they are still in their infancy due to price reasons. The mainstream market still uses air-cooled charging modules to design the host and liquid-cooled charging terminals to achieve high-power charging.

[0003] The noise of the charging host designed with air-cooled charging modules comes from the charging module itself and the system fan. The charging module is generally equipped with a speed-adjustable fan for heat dissipation, which can adjust the speed according to the ambient temperature, output voltage, and output current. A single charging module is small in size and has few output parameter combinations. The fan speed and heat and noise correlation data can be measured in a conventional temperature chamber and laboratory; while the charging host composed of multiple modules is large in size and cannot be placed in a conventional laboratory temperature chamber. The output parameter combinations are almost infinite, and the charging load will also make noise after starting. The noise value is basically impossible to measure in the laboratory, and it needs to be tested by a qualified certification agency. Summary of the invention

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

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

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

[0007] S2, turning on the adjustable charging load to perform a thermal test, thereby obtaining corresponding different system fan speed test values ​​based on 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 different module fan speed test values ​​and the different system fan speed test values, and test the noise value group of the charging host when setting each group of test values ​​based on the standard noise test method.

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

[0010] S11, obtaining the ambient temperature;

[0011] S12, for each charging module fan, controlling the output power of the corresponding charging module to be constant, and obtaining the maximum temperature speed under the ambient temperature based on different charging module output voltages and charging module output currents;

[0012] S13, determining whether the maximum temperature speed is greater than or equal to the maximum speed of the module fan, if it is determined that the ambient temperature meets the noise test conditions and executing step S2, otherwise executing step S14;

[0013] S14, raising the ambient temperature and returning to step S11.

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

[0015] S121, obtaining a plurality of different charging module fan speeds corresponding to a plurality of different charging module output voltages and charging module output currents at the ambient temperature based on the following formula:

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

[0017] Among them, r mkx Indicates the fan speed of the charging module, T mkx Indicates the air inlet temperature of the charging module, V mkx Indicates the output voltage of the charging module, I mkx Indicates the output current of the charging module, f r 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, the step S1 further includes the following steps:

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

[0021] In the charging host noise testing method of the present invention, the step S2 further includes the following steps:

[0022] S21, setting 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 charging module fan speed of each charging module according to the set proportional step based on 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 module air volume, and then turn on the adjustable charging load to perform a thermal test and adjust the system fan speed so that all charging modules are not derated to obtain corresponding multiple groups of module fan speed test values ​​and system fan speed test values.

[0024] In the charging host noise testing method of the present invention, the step S22 further includes the following steps:

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

[0026] S222, performing a thermal test on the adjustable charging load and adjusting the system fan speed so that all charging modules are not derated, and obtaining a current set of charging module fan speed test values ​​and a system fan speed test value;

[0027] S223, stepwise adjust the maximum speed of the module fan, and repeat the steps S221 and S222 in sequence for multiple times to obtain multiple sets of charging module fan speed test values ​​and system fan speed test values ​​accordingly.

[0028] In the method for testing the noise of the charging host of the present invention, in step S221, the total air volume of the module Where N is the number of charging modules, Q mkx =f q (r mkx ), indicating that the charging module is at the charging module fan speed r mkx The air volume at the time, f q is the second function expression;

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

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

[0031] S224, drawing a first curve based on the multiple groups of charging module fan speed test values ​​and the system fan speed test values;

[0032] S225, analyzing the first curve to obtain a relational expression f between the module fan speed and the system fan speed fan :

[0033]

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

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

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

[0037] S32, based on the second curve, obtaining a relationship f between the noise value group and the module fan speed or the system fan speed spl ;

[0038]

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

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

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

[0042] The method for testing the noise of the charging host of the present invention is implemented to adjust the speed of the charging module fan by controlling the output voltage and the output current, thereby obtaining different module fan speed test values ​​and system fan speed test values, which are used for the noise numerical test of the charging host, so that the noise numerical test of the charging host can be tested in the laboratory through a standard noise test method. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0044] Figure 1 It is a logic block diagram of a charging host to which the charging host noise testing method of the present invention is applicable;

[0045] Figure 2 yes Figure 1 A schematic diagram of the functional relationship between the fan speed and air volume of the charging module of the charging host shown;

[0046] Figure 3 It is a flow chart of a preferred embodiment of the method for testing the noise of a charging host of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] The noise of the charging host mainly comes from the charging module fan and the system fan. Since there is an upper limit to the fan speed, there is also an upper limit to the noise. Therefore, in the laboratory, by adjusting the output voltage and current parameters and creating high temperature conditions, the fan speed can be changed from zero to not exceeding the upper limit. Therefore, the noise of the charging host under various working conditions can be tested in the laboratory by a standard noise test method. Based on the above ideas, the present invention proposes a test method for the noise of the charging host, which is suitable for Figure 1 The charging host shown.

[0049] like Figure 1As shown, the charging host includes M system fans and N charging modules. Each charging module leads out a communication line to communicate with the charging module host computer, and the computer reads and controls the output voltage, output current, and module fan speed of the charging module. The system fan speed regulator leads out a communication line to communicate with the speed regulator host computer, and the computer reads and controls the system fan speed. Each charging module corresponds to a module fan.

[0050] For charging modules with adjustable speed of module fans, there is a set of speed control strategies. The speed control strategies of different charging module manufacturers may differ due to different structural designs, but they are usually related to the air inlet temperature, output voltage, and output current of the charging module. Therefore, the relationship is shown in Formula 1:

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

[0052] Among them, r mkx Indicates the fan speed of the charging module, T mkx Indicates the air inlet temperature of the charging module, V mkx Indicates the output voltage of the charging module, I mkx Indicates the output current of the charging module, f r is the first function expression, that is, the function expression provided by the charging module manufacturer to determine the fan speed strategy according to the air inlet temperature, output voltage, and output current. For example, formula 1 can be written as r mkx =A Vmkx *I mkx +0.2*T mkx , where A Vmkx Based on the output voltage V of the charging module mkx The coefficients determined are 0.09 for the high pressure section and 0.05 for the low pressure section.

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

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

[0055] Among them, r mkx Indicates the fan speed of the charging module, Q mkx Indicates the charging module fan speed r mkx The air volume at the time, f q is the second functional expression, i.e., the functional relationship between the fan speed and the air volume of the charging module provided by the charging module manufacturer, and its preferred implementation is as follows: Figure 2 shown.

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

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

[0058] The total air output of the charging host composed of N charging modules is shown in Formula 4:

[0059]

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

[0061] For each system fan, since the system fan has been subjected to 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, as expressed by Formula 5.

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

[0063] Among them, Q fan Indicates the system fan air volume, r fan Indicates the initial speed of the system fan, r sys is the correction coefficient of the charging host, with an initial value of zero. It can be uniformly corrected by the charging host manufacturer according to the different structures of the charging host, the mutual influence of the superimposed heat radiation of multiple modules, and the different heat radiation of internal components; f rfan is a function expression of the system fan speed and the system fan air volume, provided by the system fan manufacturer, which can be expressed as:

[0064] Q / Q0=r / r0

[0065] Among them, 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 Figure 3 The test method of the charging host noise of the present invention is as follows. Figure 3 As shown, in step S1, the maximum temperature speed of each charging module fan under the ambient temperature is calculated based on the ambient temperature, and the maximum temperature speed is adjusted by controlling the charging module output voltage and the charging module output current, 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, and then for each charging module fan, the output power of the corresponding charging module is controlled to be constant, and the maximum temperature rotation speed under the ambient temperature is 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 environment temperature T en Then in step S12, for each charging module fan, the output power of the corresponding charging module is controlled to be constant. Assuming that the output power of the charging module is constant at P, according to P=UI, multiple groups of different charging module output voltages and charging module output currents can be set based on the charging module output power P. For each group of charging module output voltages and charging module output currents, they are respectively substituted into formula 1:

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

[0070] Among them, r mkx Indicates the fan speed of the charging module, T mkx Indicates the air inlet temperature of the charging module, V mkx Indicates the output voltage of the charging module, I mkx Indicates the output current of the charging module, f r is the first function expression.

[0071] Based on the output voltage V of each charging module mkx And the charging module output current I mkx , we can get a corresponding charging module fan speed r mkx , so we can get the fan speed r of multiple charging modules mkx , and then the fan speed r from these charging modules mkx Select a maximum value from the above and use it as the maximum temperature speed r under the ambient temperature. en .

[0072] Then in step S13, we set the maximum temperature speed ren Maximum speed of the module fan with the charging module fan max Compare and determine the maximum temperature and speed r en If the ambient temperature is greater than or equal to the maximum speed of the module fan, then we can perform the subsequent noise test step, that is, perform the subsequent step S2. Otherwise, if the ambient temperature is determined to not meet the noise test conditions, we need to put the charging host and the adjustable charging load into a closed or semi-closed space to increase the ambient temperature and return to step S11. Of course, other methods can also be used to increase the ambient temperature.

[0073] Here, steps S11 to S13 need to be repeatedly performed in sequence until the ambient temperature meets the noise test conditions, and then the test operation of the subsequent step S2 can be performed.

[0074] In a further preferred embodiment of the present invention, before or after obtaining the ambient temperature, the temperature of the charging port air inlet module of each charging module can also be obtained, and then the influence of the charging host structure on the system heat dissipation is judged based on the ambient temperature and the temperature of the charging port air inlet module of each charging module. It should be noted that the judgment step can be performed at any time, for example, before, during or after the maximum temperature speed acquisition step (i.e., S11 to S14), and for example, before, during or after the module fan speed test value and system fan speed test value acquisition step (i.e., steps S21 to S22, S221 to 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 a further preferred embodiment of the present invention, the charging module inlet air temperature T mkx With ambient temperature T en By comparison, if the difference exceeds the allowable error range, it means that the host structure has a negative impact on heat dissipation. Although it will not lead to derating, the system fan speed needs to be increased, and the noise will be relatively increased.

[0076] In a further preferred embodiment of the present invention, the charging module inlet air temperature T mkx For comparison, or the charging module inlet air temperature T of each charging module mkx Compared with its mean or difference, if the charging module inlet air temperature T mkx If the difference is less than the set threshold, or the deviation from the mean is small, it means that the charging host structure is evenly designed and the air intake and heat dissipation of each module are close. Otherwise, it means that the host structure has a negative impact on heat dissipation. Although it will not lead to derating, the system fan speed needs to be increased, and the noise will be relatively increased.

[0077] like Figure 3 As shown, in step S2, the adjustable charging load is turned on for thermal testing, so as to obtain corresponding 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 value and current value when the maximum temperature speed is 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 above steps. mkx And the charging module output current I mkx .

[0078] In step S22, the charging module fan speed of each charging module is adjusted in steps according to a set proportion 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 module air volume. Then, the adjustable charging load is turned on for thermal testing and the system fan speed is adjusted so that all charging modules are not derated to obtain corresponding multiple groups 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 fan speed of each charging module is set to the maximum fan speed of the module, that is, the fan speed of the charging module is r mkx = Maximum speed of module fan r max , and the system fan speed makes the system fan air volume equal to the total module air volume, that is, the system fan air volume Q fan =Total air volume of module Q mk Based on the above formulas 3 to 5,

[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 so that all charging modules are not derated, and obtain a current set of charging module fan speed test values ​​and a system fan speed test value, that is, obtain a charging module fan speed value r mkx and system fan speed value r fanxThe first set of values ​​(r max , r fan0 )

[0084] Then execute step S233, stepwise adjust the maximum speed of the module fan, and repeat the sequence of steps S221 and S222 for multiple times to obtain multiple groups 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 set to d%r max Adjust, that is, let r mkx =r max -d %r max , and then bring it to step S221, and repeat steps S221 and S222 to obtain the second set of charging module fan speed test values ​​and system fan speed test values, that is, the charging module fan speed value r is obtained. 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 , and then bring it into step S221, and repeat steps S221 and S222 to obtain the third set of charging module fan speed test values ​​and system fan speed test values, that is, the charging module fan speed value r is obtained. mkx and system fan speed value r fanx The second set of values ​​(r max -2*d%r max , r fan2 ), and the cycle is executed multiple times, so that multiple sets of charging module fan speed test values ​​and system fan speed test values ​​can be obtained. Here, d% can be adjusted according to the actual accuracy requirements. The smaller the d value, the higher the accuracy. That is, the smaller the d value, the more test points, and the more accurate the above relationship expressed by connecting the corresponding values ​​of each point into a curve. For values ​​falling between two points, the linear value of the nearest two points is used to obtain it.

[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 drawn based on the multiple sets of charging module fan speed test values ​​and system fan speed test values; then the first curve can be analyzed to obtain the relationship between the module fan speed and the system fan speed. fan :

[0087]

[0088] Among them, r fanxIndicates the system fan speed, Q mk Indicates the total air volume of the module, Q mkx =f q (r mkx ), indicating that the charging module is at the charging module fan speed r mkx The air volume at the time, f q is the second functional expression, i.e., the functional relationship between the fan speed and the air volume of the charging module provided by the charging module manufacturer, and its preferred implementation is as follows: Figure 2 As shown; N represents the number of charging modules.

[0089] In step S3, we formally conduct 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 when setting each group of test values ​​based on the standard noise test method.

[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. Then, according to the different module fan speed test values ​​and the different system fan speed test values ​​obtained in the aforementioned step S2, the module fan speed of each charging module and the system fan speed of each system fan are set one by one. Then, the standard noise test method is used to measure the noise digital group SPL of the charging host corresponding to each group of test values. sysx , and then the noise value group SPL based on the charging host sysx , the module fan speed test value and the system fan speed test value are used to draw a second curve; by analyzing the second curve, the relationship between the noise value group and the module fan speed or the system fan speed can be obtained. spl ;

[0091]

[0092] Among them, SPL sysx represents the noise value group, r fanx Indicates the system fan speed, r mkx Indicates the module fan speed, and N indicates the number of charging modules.

[0093] In a preferred embodiment of the present invention, the noise value group of the front, back, left and right sides of the charging host can be measured according to the standard noise test method. The standard noise test method is common knowledge in the art and will not be described again here.

[0094] In a preferred embodiment of the present invention, the smaller the d value in the above steps is, the more test points there are, and the more accurate the above relationship expression expressing the curve formed by connecting the corresponding values ​​of each point is. For the value falling between two points, the linear value of the two nearest points is used to obtain the value.

[0095] In a further preferred embodiment of the present invention, the method for testing the noise of the charging host of the present invention 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 according to the relationship f spl The target module air output is obtained, and the output current of each charging module is adjusted based on the target air output so that the actual module air output and the target module air output meet the set difference condition, thereby achieving noise control.

[0096] In a preferred embodiment of the present invention, the system noise target can be set first According to the above formula 7, the system noise target can be obtained Corresponding target module air volume

[0097]

[0098] Among them, SPL sysx represents the noise value group, r fanx Indicates the system fan speed, r mkx Indicates the module fan speed, f q is the second functional expression, i.e., the functional relationship between the fan speed and the air volume of the charging module provided by the charging module manufacturer, and its preferred implementation is as follows: Figure 2 As shown; N represents the number of charging modules.

[0099] After obtaining the target module air volume Then, by making the actual module air volume Target module air volume If the set difference condition is met, noise control can be achieved. It is known that f q The corresponding module fan speed r that can achieve noise control is known. mkx It can be seen that, based on the previous formula 1, r mkx =f r (T mkx , V mkx , I mkx ), by adjusting the output current I of each charging module mkz , that is, to obtain the actual module air volume that meets the noise control requirements That is, by adjusting the output current of the charging module or stopping part of the output current through the charging main controller in the charging host, the actual module air volume can be Target module air volume The set difference condition is met to achieve noise control.

[0100] The method for testing the noise of the charging host of the present invention can be implemented. Under the premise of ensuring that the charging host can dissipate heat without derating, based on the fan speed regulation strategy of the charging module itself and the adjustable speed of the system fan, and utilizing the principle that the total air output of the charging module can be replaced, the noise level of the charging pile can be tested in a conventional laboratory. The rationality of the structural design of the charging host 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] Next, we use the aforementioned charging host noise test method of the present invention to test the 480kW charging host, which includes 12 40kW charging modules, the control voltage of the module fan is 15V at most and 3V at least, and the system fan PWM controls the fan speed of the system. The laboratory ambient temperature is about 30 degrees. According to the typical function expression in formula 1, the maximum control voltage under this temperature condition is 13.2V, and the maximum temperature speed at this temperature is reached when the output voltage high voltage section is 500V and the output current is 80A. At this time, the maximum temperature speed is still less than the maximum speed of the module fan. At this time, the charging host and the adjustable charging load are placed in a closed or semi-enclosed space in the laboratory, and the equipment is used to heat itself to make the ambient temperature reach about 40 degrees. The maximum temperature speed at this temperature is greater than the maximum speed of the module fan. Here, the test can be carried out according to the charging module output voltage of 0.5 or 1V as a step until the maximum temperature speed is greater than the maximum speed of the module fan, that is, the noise is close to the ambient noise, and the results are shown in Table 1.

[0102] Table 1

[0103]

[0104] Turn on the adjustable charging load for thermal testing, so as to obtain corresponding different system fan speed test values ​​based on different module fan speed test values. Then 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 different module fan speed test values ​​and the different system fan speed test values, and test the noise value group of the charging host when setting each set of test values ​​based on the standard noise test method. Here, the maximum speed of the module fan is stepped to obtain multiple groups of charging module fan speed test values ​​and system fan speed test values, and the results are shown in Table 2:

[0105] Table 2

[0106]

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

[0108] The method for testing the noise of the charging host of the present invention is implemented by adjusting 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 used for the numerical noise test of the charging host, so that the numerical noise test of the charging host can be tested in the laboratory through a standard noise test method. Furthermore, the influence of the structure of the charging host on the heat dissipation of the system can also be determined based on the temperature data during the test. Furthermore, the output current of the charging module can also be adjusted according to the system noise target to achieve noise control.

[0109] Although the present invention is described by specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods falling within the scope of the claims of the present invention.

[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 in the protection scope of the present invention.

Claims

1. A method for testing the noise of a charging host, characterized in that: The following steps are involved: S1. Calculate the maximum temperature speed of each charging module fan under the ambient temperature based on the ambient temperature, and adjust the maximum temperature speed by controlling the charging module output voltage and the charging module output current so that the maximum temperature speed is greater than or equal to the maximum speed of the module fan; S2, turning on the adjustable charging load to perform a thermal test, thereby obtaining corresponding 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 the different module fan speed test values ​​and the different system fan speed test values, and test the noise value group of the charging host when setting each group of test values ​​based on the standard noise test method.

2. The method for testing the noise of a charging host according to claim 1, characterized in that: The step S1 further comprises the following steps: S11, obtaining the ambient temperature; S12, for each charging module fan, controlling the output power of the corresponding charging module to be constant, and obtaining the maximum temperature speed under the ambient temperature based on different charging module output voltages and charging module output currents; S13, determining whether the maximum temperature speed is greater than or equal to the maximum speed of the module fan, if it is determined that the ambient temperature meets the noise test conditions and executing step S2, otherwise executing step S14; S14, raising the ambient temperature and returning to step S11.

3. The method for testing the noise of a charging host according to claim 2, characterized in that: The step S12 comprises the following steps: S121, obtaining a plurality of different charging module fan speeds corresponding to a plurality of different charging module output voltages and charging module output currents at the ambient temperature based on the following formula: r mkx =f r (T mkx ,V mkx ,I mkx ) Among them, r mkx Indicates the fan speed of the charging module, T mkx Indicates the air inlet temperature of the charging module, V mkx Indicates the output voltage of the charging module, I mkx Indicates the output current of the charging module, f r is the first function expression; S122. Obtain the maximum temperature speed from the multiple different charging module fan speeds.

4. The method for testing the noise of a charging host according to claim 2, characterized in that: The step S1 further comprises the following steps: The influence of the structure of the charging host on the heat dissipation of the system is determined based on the ambient temperature and the temperature of the air inlet module of the charging port of each charging module.

5. The method for testing the noise of a charging host according to claim 1 or 2, characterized in that: The step S2 further comprises the following steps: S21, setting 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; S22. Adjust the charging module fan speed of each charging module in steps according to the set proportion based on 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 module air volume, and then turn on the adjustable charging load to perform a thermal test and adjust the system fan speed so that all charging modules are not derated to obtain corresponding multiple groups of module fan speed test values ​​and system fan speed test values.

6. The method for testing the noise of a charging host according to claim 5, characterized in that: The step S22 further comprises the following steps: S221, setting the charging module fan speed of each charging module to the maximum module fan speed, and setting the system fan speed so that the system fan air volume is equal to the total module air volume; S222, performing a thermal test on the adjustable charging load and adjusting the system fan speed so that all charging modules are not derated, and obtaining a current set of charging module fan speed test values ​​and a system fan speed test value; S223, stepwise adjust the maximum speed of the module fan, and repeat the steps S221 and S222 in sequence for multiple times to obtain multiple sets of charging module fan speed test values ​​and system fan speed test values ​​accordingly.

7. The method for testing the noise of a charging host according to claim 6, characterized in that: In step S221, the total air volume of the module Where N is the number of charging modules, Q mkk =f q (r mkx ), indicating that the charging module is at the charging module fan speed r mkx The air volume at the time, f q is the second function expression; System fan air volume Q fan =f rfan (r fan +r sys ), r fan Indicates the initial speed of the system fan, r sys Indicates the correction factor of the charging host, f rfan is the third function expression.

8. The method for testing the noise of a charging host according to claim 6, characterized in that: The step S22 further comprises the following steps: S224, drawing a first curve based on the multiple groups of charging module fan speed test values ​​and the system fan speed test values; S225, analyzing the first curve to obtain a relational expression f between the module fan speed and the system fan speed fan : Among them, r fanx Indicates the system fan speed, Q mk Indicates the total air volume of the module, Q mkx =f q (r mkx ), indicating that the charging module is at the charging module fan speed r mkx The air volume at the time, f q is the second function expression, and N represents the number of charging modules.

9. The method for testing the noise of a charging host according to claim 1 or 2, characterized in that: The step S3 further comprises the following steps: S31, drawing a second curve based on the noise value group of the charging host, the module fan speed test value and the system fan speed test value; S32, based on the second curve, obtaining a relationship f between the noise value group and the module fan speed or the system fan speed spl ; Among them, SPL sysx represents the noise value group, r fanx Indicates the system fan speed, r mkx Indicates the fan speed of the module, N indicates the number of charging modules, f q is the second function expression, f fan Represents the relationship between the module fan speed and the system fan speed.

10. The method for testing the noise of a charging host according to claim 9, characterized in that: Further comprising the steps of: S4, setting a system noise target, and based on the system noise target according to the relationship f spl The target module air output is obtained, and the output current of each charging module is adjusted based on the target air output so that the actual module air output and the target module air output meet the set difference condition, thereby achieving noise control.

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