A temperature rise regulation method for a dv / dt reduction filter

Abstract

The present invention relates to the technical field of temperature rise regulation, and specifically discloses a temperature rise regulation method for a dv / dt damping filter, comprising the following steps: S1: setting a voltage range and an ambient temperature range for the filter; obtaining the temperature rise of the filter under the same ambient temperature and different voltages, and obtaining a curve showing the temperature rise of the filter varying with voltage and ambient temperature through nonlinear regression analysis; S2: when the temperature rise of the filter is greater than or equal to a preset value, setting an ideal temperature rise value for the filter, obtaining the real-time ambient temperature, and substituting the temperature rise of the filter into the curve showing the temperature rise of the filter varying with voltage and ambient temperature to obtain a target voltage; S3: when the Upeak value of the filter is greater than or equal to a preset value, adjusting the load at a preset fixed load interval until the Upeak value is less than the preset value, thereby reducing the temperature rise of the filter and the Upeak value. The present invention can balance the relationship between the temperature rise and the Upeak value of the filter, extend the service life of the equipment, and improve system performance and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature rise regulation, and in particular to a temperature rise regulation method for a dv / dt amplitude reduction filter. Background Art

[0002] A filter is an electronic circuit or device that selectively passes or blocks signals of different frequencies. Its core functions include, but are not limited to, the following: 1. Frequency selection: allowing signals within a specific frequency range to pass while blocking (or significantly attenuating) signals at other frequencies; 2. Interference elimination: In power lines or other signal lines, filters can effectively reduce or eliminate unwanted frequency components, such as high-frequency interference, thereby protecting equipment from harmful effects.

[0003] The temperature rise of a filter refers to the phenomenon of internal temperature rise caused by the passage of current during operation. During operation, the filter will cause energy loss due to the existence of internal resistance and other factors. This energy is eventually converted into heat, causing the temperature of the device to rise. The magnitude of this temperature rise is one of the important indicators for measuring filter performance, because it is directly related to the reliability and stability of the filter. For example, the temperature drift characteristic: the operating frequency of the filter will drift with changes in temperature. This phenomenon is called temperature drift. Temperature drift will cause the filter passband to shift, which in turn affects the insertion loss of the passband, especially the loss at the edge of the passband, and the suppression of out-of-band signals. This is particularly critical for applications that require precise frequency response.

[0004] In the chemical industry, the filter temperature rise requirement is generally less than approximately 70°C. This is because excessively high filter temperature rises can lead to performance degradation or even damage. The Upeak value refers to the peak-to-peak voltage that the filter can achieve during operation. The Upeak value and the filter temperature rise are inversely related: lower temperature rise requirements lead to higher actual Upeak values. This means that if the filter temperature rise is required to be lower, its Upeak value will increase accordingly, and vice versa, making it difficult to balance the two. Based on this, a temperature rise adjustment method for a dv / dt reduction filter is provided to balance the relationship between the filter temperature rise and the Upeak value, thereby extending the service life of the equipment and improving system performance and reliability. Summary of the Invention

[0005] The object of the present invention is to provide a temperature rise regulation method for a dv / dt reduction filter to solve the above technical problems.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for regulating the temperature rise of a dv / dt reduction filter comprises the following steps:

[0008] S1: Set the voltage range of the filter [V min , V max ], and set the ambient temperature range [K min , K max ];

[0009] While keeping the ambient temperature constant, adjust the voltage of the filter from low to high at a preset fixed voltage interval, and obtain the temperature rise of the filter after the preset time interval;

[0010] Adjusting the ambient temperature from low to high at preset ambient temperature intervals, and repeating the above steps after each adjustment of the ambient temperature, obtaining the temperature rise of the filter under the same ambient temperature and different voltages, and obtaining a curve f(V, K) of the temperature rise of the filter as a function of voltage and ambient temperature through nonlinear regression analysis;

[0011] S2: Real-time acquisition of filter temperature rise T rea , set the filter temperature rise threshold T thr , when there is a temperature rise of the filter T rea ≥T thr When the filter temperature rise is set to the ideal value T ide , and obtain the real-time ambient temperature K rea , and substitute the curve f(V, K) of the filter temperature rise with voltage and ambient temperature to obtain the target voltage V goa , and adjust the filter voltage to the target voltage V goa ;

[0012] S3: Acquire the Upeak value of the filter in real time. When the Upeak value of the filter is greater than or equal to a preset value, adjust the load at a preset fixed load interval until the Upeak value is less than the preset value.

[0013] As a further solution of the present invention: in step S1, the voltage range of the filter [V min , V max ] Determined by the type and model of the filter. For example, a filter used for a 50Hz single-phase power supply may have a rated voltage of 250V, while a filter used for a three-phase power supply may have a rated voltage of 440V. This rated voltage ensures that the filter operates under safe working conditions and prevents damage to internal components due to excessive voltage.

[0014] As a further solution of the present invention: in step S1, the process of setting the ambient temperature range specifically includes:

[0015] Set m monitoring cycles, where m is a preset value, set the monitoring area, obtain the minimum value of the ambient temperature in the monitoring area within m monitoring cycles, and use it as the lower limit K of the ambient temperature rangemin ;

[0016] Similarly, get the upper limit K of the ambient temperature range max .

[0017] As a further solution of the present invention: in step S1, the process of obtaining the filter temperature rise specifically includes:

[0018] A plurality of collection points are set on the filter at preset fixed distance intervals, and the temperature rise of the filter is obtained at each collection point, and the average value is calculated as the temperature rise of the filter.

[0019] As a further solution of the present invention, the process of calculating the mean value further includes the following steps:

[0020] Calculate the evaluation difference ∆C=|Ci-C'|, where Ci represents the temperature rise measured at the i-th collection point, and C' is the average value. When the evaluation difference ∆C is greater than or equal to the preset value, remove and discard Ci and recalculate the average value.

[0021] As a further solution of the present invention: in step S2, the ideal value of the filter temperature rise T ide The setup process specifically includes:

[0022] Get the current voltage V rea and ambient temperature K rea , set the voltage range [V rea -V',V rea + V'], where V' is the preset value, set the ambient temperature range [K rea -K',K rea +K'], where K' is the preset value;

[0023] Set n evaluation cycles, where n is a preset value, obtain the ambient temperature in the evaluation cycle, and select the ambient temperature that falls within the ambient temperature range, defining it as the initial temperature;

[0024] Obtain the voltage of the filter when the ambient temperature is the undetermined temperature, and filter out the voltage that belongs to the voltage range, define it as the data voltage, and use the ambient temperature corresponding to the target voltage as the data temperature;

[0025] The temperature rise corresponding to the filter which is both the data voltage and the data temperature is obtained, and the average is calculated as the ideal value of the filter temperature rise.

[0026] As a further solution of the present invention: in the step S2, when the target voltage is outside the preset voltage adjustment range during the process of adjusting the filter voltage, the following steps are performed:

[0027] The voltage within the voltage regulation range is defined as a pending voltage;

[0028] The difference between the target voltage and the to-be-determined voltage is calculated, and the minimum value thereof is obtained, and the voltage is adjusted to the voltage corresponding to the minimum value.

[0029] As a further solution of the present invention: in the step S3, during the process of adjusting the load, a load adjustment range is set. When there is a load within the load adjustment range that cannot make the Upeak value less than the preset value, the Upeak value after each load adjustment is recorded, and the load corresponding to the minimum value is obtained and defined as the first load, and the load is adjusted to the first load.

[0030] Beneficial effects of the present invention: In the chemical industry, the temperature rise requirement of the filter is generally less than about 70°C. The Upeak value refers to the peak-to-peak voltage that the filter can reach during operation. The temperature rise of the filter and the Upeak value are in an antagonistic relationship, and the two are difficult to balance. In the present invention, the voltage range and the ambient temperature range of the filter are first set; it can be understood that the setting voltage range is determined according to the model and type of the filter. Different models of filters have different rated voltages. Exceeding the rated voltage may cause damage to the filter, and a lower voltage will cause the normal operation of the equipment, thereby affecting the overall performance of the system. Therefore, it is necessary to determine the voltage range of the filter; set the ambient temperature range. The temperature range is designed to reduce the amount of experiments, thereby reducing the amount of data and improving data processing efficiency. Therefore, the temperature conditions of the area where the filter is working in the past m years are selected, and the maximum and minimum values ​​therein are determined, that is, the ambient temperature range; then the temperature rise data of the filter under different ambient temperatures and voltages are obtained, and the curve f(V, K) of the filter temperature rise versus voltage and ambient temperature is obtained through nonlinear regression analysis; it can be understood that in actual situations, both ambient temperature and voltage will affect the temperature rise of the filter. The higher the voltage, the higher the temperature rise of the filter, and the higher the ambient temperature, the higher the temperature rise of the filter. Taking both into consideration, the accuracy of the data is improved;

[0031] At the same time, in actual situations, ambient temperature and voltage have potential mutual influences. Therefore, nonlinear regression analysis is used to obtain the curve f(V, K) showing the temperature rise of the filter as a function of voltage and ambient temperature. Nonlinear regression analysis can accurately establish a complex relationship model between temperature rise and voltage, which helps to better control and predict the performance of the filter in the future.

[0032] Afterwards, the filter voltage is adjusted by obtaining the ambient temperature in real time and combining it with the ideal value of the filter temperature rise to achieve the purpose of controlling the filter temperature rise. It can be understood that when the filter temperature exceeds the set threshold, the heat generation can be reduced by reducing the voltage, preventing the device from being damaged due to overheating. At the same time, the influence of the ambient temperature is taken into account, making the control of the filter temperature rise more accurate. Finally, the Upeak value of the filter is monitored in real time, and when the Upeak value is abnormal, the load is adjusted to ensure that the Upeak value is within a reasonable range, ensuring that the filter temperature rise does not exceed the limit while ensuring that the Upeak value is reasonable. The present invention can balance the relationship between the filter temperature rise and the Upeak value, extend the service life of the equipment, and improve the system performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Figure 1 The present invention is a flow chart of a method for regulating the temperature rise of a dv / dt reduction filter. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] See also Figure 1 As shown, the present invention is a temperature rise regulation method for a dv / dt reduction filter, comprising the following steps:

[0037] S1: Set the voltage range of the filter [V min , V max ], and set the ambient temperature range [K min , K max ];

[0038] While keeping the ambient temperature constant, adjust the voltage of the filter from low to high at a preset fixed voltage interval, and obtain the temperature rise of the filter after the preset time interval;

[0039] Adjusting the ambient temperature from low to high at preset ambient temperature intervals, and repeating the above steps after each adjustment of the ambient temperature, obtaining the temperature rise of the filter under the same ambient temperature and different voltages, and obtaining a curve f(V, K) of the temperature rise of the filter as a function of voltage and ambient temperature through nonlinear regression analysis;

[0040] S2: Real-time acquisition of filter temperature rise Trea , set the filter temperature rise threshold T thr , when there is a temperature rise of the filter T rea ≥T thr When the filter temperature rise is set to the ideal value T ide , and obtain the real-time ambient temperature K rea , and substitute the curve f(V, K) of the filter temperature rise with voltage and ambient temperature to obtain the target voltage V goa , and adjust the filter voltage to the target voltage V goa ;

[0041] S3: Acquire the Upeak value of the filter in real time. When the Upeak value of the filter is greater than or equal to a preset value, adjust the load at a preset fixed load interval until the Upeak value is less than the preset value.

[0042] It should be noted that in the chemical industry, the temperature rise requirement of the filter is generally less than about 70°C. The Upeak value refers to the peak-to-peak voltage that the filter can reach during operation, and the temperature rise of the filter and the Upeak value are in an antagonistic relationship. It is difficult to balance the two. In the present invention, the voltage range and the ambient temperature range of the filter are first set; it can be understood that the setting voltage range is determined according to the model and type of the filter. Different models of filters have different rated voltages. Exceeding the rated voltage may cause damage to the filter, and a lower voltage will affect the normal operation of the equipment, thereby affecting the overall performance of the system. Therefore, it is necessary to determine the voltage range of the filter; set the ambient temperature The purpose of the temperature range is to reduce the amount of experiments, thereby reducing the amount of data and improving data processing efficiency. Therefore, the temperature conditions of the area where the filter is working in the past m years are selected, and the maximum and minimum values ​​are determined, that is, the ambient temperature range; then the temperature rise data of the filter under different ambient temperatures and voltages are obtained, and the curve f(V, K) of the filter temperature rise versus voltage and ambient temperature is obtained through nonlinear regression analysis; it can be understood that in actual situations, both ambient temperature and voltage will affect the temperature rise of the filter. The higher the voltage, the higher the temperature rise of the filter, and the higher the ambient temperature, the higher the temperature rise of the filter. Taking both into consideration, the accuracy of the data is improved;

[0043] At the same time, in actual situations, ambient temperature and voltage have potential mutual influences. Therefore, nonlinear regression analysis is used to obtain the curve f(V, K) showing the temperature rise of the filter as a function of voltage and ambient temperature. Nonlinear regression analysis can accurately establish a complex relationship model between temperature rise and voltage, which helps to better control and predict the performance of the filter in the future.

[0044] Afterwards, the ambient temperature is obtained in real time and the voltage of the filter is adjusted in combination with the ideal value of the filter temperature rise to achieve the purpose of controlling the filter temperature rise. It can be understood that when the temperature of the filter exceeds the set threshold, the heat generation can be reduced by reducing the voltage to prevent the device from being damaged due to overheating. At the same time, the influence of the ambient temperature is taken into account, making the control of the filter temperature rise more precise. Finally, the Upeak value of the filter is monitored in real time, and when the Upeak value is abnormal, the load is adjusted to ensure that the Upeak value is within a reasonable range, ensuring that the filter temperature rise does not exceed the limit while ensuring that the Upeak value is reasonable.

[0045] In another preferred embodiment of the present invention, in step S1, the voltage range of the filter [V min , V max ] Determined by the type and model of the filter. For example, the rated voltage of a filter used for a 50Hz single-phase power supply may be 250V, while the rated voltage of a filter used for a three-phase power supply may be 440V. This rated voltage ensures that the filter operates under safe working conditions and prevents damage to internal components due to excessive voltage.

[0046] It is worth noting that different types of filters have different rated voltages. Exceeding the rated voltage may cause damage to the filter, while a lower voltage will affect the normal operation of the equipment, thereby affecting the overall performance of the system. Therefore, it is necessary to determine the voltage range of the filter.

[0047] In another preferred embodiment of the present invention, in step S1, the process of setting the ambient temperature range specifically includes:

[0048] Set m monitoring cycles, where m is a preset value, set the monitoring area, obtain the minimum value of the ambient temperature in the monitoring area within m monitoring cycles, and use it as the lower limit K of the ambient temperature range min ;

[0049] Similarly, get the upper limit of the ambient temperature range K max .

[0050] It can be understood that each monitoring cycle lasts for one year, and the monitoring area is the area where the current filter works. The ambient temperature range is determined by the maximum and minimum temperature values ​​in the last m years, that is, the ambient temperature range, which can reduce unnecessary work and thus reduce the amount of data that needs to be processed later, thereby improving the overall processing efficiency of the system.

[0051] In another preferred embodiment of the present invention, in step S1, the process of obtaining the filter temperature rise specifically includes:

[0052] A plurality of collection points are set on the filter at preset fixed distance intervals, and the temperature rise of the filter is obtained at each collection point, and the average value is calculated as the temperature rise of the filter.

[0053] It should be noted that in actual situations, the temperature rise at different locations of the filter may be different. The reasons include: 1. Heat conduction path: The heat dissipation conditions at different locations may be different. Some areas may be closer to the heat dissipation components or have better heat conduction paths, so the temperature rise is smaller, while those areas with poor heat dissipation conditions may have a higher temperature rise due to heat accumulation; 2. Device layout: The layout of devices on the circuit board will also affect the temperature rise. If there are more devices in a certain area or they are arranged closely, it may cause local hot spots, thereby affecting the temperature rise of that area; therefore, it is chosen to set acquisition points and calculate the average value of the temperature rise at the acquisition points to obtain the temperature rise of the filter to improve the accuracy of the data. At the same time, the acquisition points are set evenly, which can reduce the probability of errors.

[0054] In another preferred embodiment of the present invention, the process of calculating the mean further includes the following steps:

[0055] Calculate the evaluation difference ∆C=|Ci-C'|, where Ci represents the temperature rise measured at the i-th acquisition point, and C' is the average temperature rise of the filter. When the evaluation difference ∆C is greater than or equal to a preset value, remove and discard Ci and recalculate the average.

[0056] It should be noted that the purpose of doing this is to reduce errors. When the evaluation difference is greater than or equal to the preset value, it means that the difference between the temperature rise and the mean at the corresponding collection point is too large, which may be caused by measurement errors and other reasons. Therefore, the temperature rise at the collection point is discarded and the mean is recalculated to improve the accuracy of subsequent processing.

[0057] In another preferred embodiment of the present invention, in step S2, the ideal value of the filter temperature rise T ide The setup process specifically includes:

[0058] Get the current voltage Vrea and ambient temperature Krea, set the voltage range [Vrea-V', Vrea+V'], where V' is the preset value, and set the ambient temperature range [Krea-K', Krea+K'], where K' is the preset value;

[0059] Set n evaluation cycles, where n is a preset value, obtain the ambient temperature in the evaluation cycle, and select the ambient temperature that falls within the ambient temperature range, defining it as the initial temperature;

[0060] Obtain the voltage of the filter when the ambient temperature is the undetermined temperature, and filter out the voltage that belongs to the voltage range, define it as the data voltage, and use the ambient temperature corresponding to the target voltage as the data temperature;

[0061] The temperature rise corresponding to the filter which is both the data voltage and the data temperature is obtained, and the average is calculated as the ideal value of the filter temperature rise.

[0062] It is understandable that the purpose of doing this is to ensure the normal operation of the filter while reducing the temperature rise. Although a low temperature rise can ensure the service life of the equipment, when adjusting the temperature rise of the filter by adjusting the voltage in this solution, blindly pursuing a low temperature rise may cause the voltage to be too low, which in turn causes the equipment to fail to work properly and affect the overall performance of the system. Therefore, an evaluation cycle is set, where each evaluation cycle is one day, and the temperature rise at the same voltage and ambient temperature as the current time in the past n days is obtained as the ideal temperature rise value, which can ensure that the performance of the equipment is guaranteed while adjusting the temperature rise.

[0063] In another preferred embodiment of the present invention, in step S2, when the target voltage is outside the preset voltage adjustment range during the process of adjusting the filter voltage, the following steps are performed:

[0064] The voltage within the voltage regulation range is defined as a pending voltage;

[0065] The difference between the target voltage and the to-be-determined voltage is calculated, and the minimum value thereof is obtained, and the voltage is adjusted to the voltage corresponding to the minimum value.

[0066] It is worth noting that a filter voltage that is too low may cause the system to not work properly or its working performance to deteriorate; a voltage that is too high may cause the system to generate excessive heat, increase energy consumption and possibly damage circuit components. Therefore, when adjusting the voltage, the voltage should be kept within the set voltage adjustment range. When the target voltage does not exist in the voltage range, the voltage closest to the target voltage should be selected to ensure the system performance and equipment life as much as possible.

[0067] In another preferred embodiment of the present invention, in step S3, during the process of adjusting the load, a load adjustment range is set. When there is a load within the load adjustment range that cannot make the Upeak value less than the preset value, the Upeak value after each load adjustment is recorded, and the load corresponding to the minimum value is obtained and defined as the first load, and the load is adjusted to the first load.

[0068] It is worth noting that by setting the load range, the adjustment amplitude can be limited to ensure that the adjustment is carried out within a controllable range and avoid exceeding the range that the system can withstand; the load corresponding to the minimum value is selected as the first load because this load can make the Upeak value as close to the preset value as possible, ensuring that the system is as close to the optimal working state as possible while meeting the preset conditions.

[0069] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for regulating the temperature rise of a dv / dt reduction filter, characterized in that: The following steps are involved: S1: Set the voltage range of the filter [V min , V max ], and set the ambient temperature range [K min , K max ]; While keeping the ambient temperature constant, adjust the voltage of the filter from low to high at a preset fixed voltage interval, and obtain the temperature rise of the filter after the preset time interval; Adjusting the ambient temperature from low to high at preset ambient temperature intervals, and repeating the above steps after each adjustment of the ambient temperature, obtaining the temperature rise of the filter under the same ambient temperature and different voltages, and obtaining a curve f(V, K) of the temperature rise of the filter as a function of voltage and ambient temperature through nonlinear regression analysis; S2: Real-time acquisition of filter temperature rise T rea , set the filter temperature rise threshold T thr , when there is a temperature rise of the filter T rea ≥T thr When the filter temperature rise is set to the ideal value T ide , and obtain the real-time ambient temperature K rea , and substitute the curve f(V, K) of the filter temperature rise with voltage and ambient temperature to obtain the target voltage V goa , and adjust the filter voltage to the target voltage V goa ; S3: acquiring the Upeak value of the filter in real time, and when the Upeak value of the filter is greater than or equal to a preset value, adjusting the load at a preset fixed load interval until the Upeak value is less than the preset value; Ideal filter temperature rise value T ide The setup process specifically includes: Get the current voltage Vrea and ambient temperature Krea, set the voltage range [Vrea-V', Vrea+V'], where V' is the preset value, and set the ambient temperature range [Krea-K', Krea+K'], where K' is the preset value; Set n evaluation cycles, where n is a preset value, obtain the ambient temperature in the evaluation cycle, and select the ambient temperature that falls within the ambient temperature range, defining it as the initial temperature; Obtain the voltage of the filter when the ambient temperature is the undetermined temperature, and filter out the voltage that belongs to the voltage range, define it as the data voltage, and use the ambient temperature corresponding to the target voltage as the data temperature; The temperature rise corresponding to the filter which is both the data voltage and the data temperature is obtained, and the average is calculated as the ideal value of the filter temperature rise.

2. The temperature rise adjustment method of a dv / dt reduction filter according to claim 1, characterized in that: In step S1, the voltage range of the filter [V min , V max ] is determined by the type and model of the filter. For example, the filter used for 50Hz single-phase power supply has a rated voltage of 250V, while the filter used for three-phase power supply has a rated voltage of 440V. This rated voltage ensures that the filter operates under safe working conditions and prevents damage to internal components due to excessive voltage.

3. The temperature rise adjustment method of a dv / dt reduction filter according to claim 1, characterized in that: In step S1, the process of setting the ambient temperature range specifically includes: Set m monitoring cycles, where m is a preset value, set the monitoring area, obtain the minimum value of the ambient temperature in the monitoring area within m monitoring cycles, and use it as the lower limit K of the ambient temperature range min ; Similarly, get the upper limit K of the ambient temperature range max .

4. The temperature rise regulation method of a dv / dt reduction filter according to claim 1, characterized in that: In step S1, the process of obtaining the filter temperature rise specifically includes: A plurality of collection points are set on the filter at preset fixed distance intervals, and the temperature rise of the filter is obtained at each collection point, and the average value is calculated as the temperature rise of the filter.

5. The temperature rise adjustment method of a dv / dt reduction filter according to claim 4, characterized in that: The process of calculating the mean also includes the following steps: Calculate the evaluation difference ΔC=|Ci-C'|, where Ci represents the temperature rise measured at the i-th collection point, and C' is the mean. When the evaluation difference ΔC is greater than or equal to the preset value, remove and discard Ci and recalculate the mean.

6. The temperature rise regulation method of a dv / dt reduction filter according to claim 1, characterized in that: In the step S2, during the process of adjusting the filter voltage, when the target voltage is outside the preset voltage adjustment range, the following steps are performed: The voltage within the voltage regulation range is defined as a pending voltage; The difference between the target voltage and the to-be-determined voltage is calculated, and the minimum value thereof is obtained, and the voltage is adjusted to the voltage corresponding to the minimum value.

7. The temperature rise regulation method of a dv / dt reduction filter according to claim 1, characterized in that: In step S3, during the process of adjusting the load, a load adjustment range is set. When there is a load within the load adjustment range that cannot make the Upeak value less than the preset value, the Upeak value after each load adjustment is recorded, and the load corresponding to the minimum value is obtained and defined as the first load, and the load is adjusted to the first load.

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