Direct current power supply module transient response test method and system

Abstract

The invention discloses a DC power supply module transient response test method and system, and the method comprises the steps: detecting a transient response waveform of a DC power supply module through an obtaining module, outputting a corresponding sampling signal, and receiving the sampling signal through a control terminal; and data processing and calculation are carried out on the sampled signal data based on the MATLAB language to obtain output response and recovery time, so that the transient response automatic test of the direct-current power supply module is realized, the test is more convenient, and the test result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of power module screening and testing, and particularly to a method and system for testing the transient response of a DC power module. Background Art

[0002] In the screening and testing of hybrid integrated circuit DC / DC or AC / DC converters, it is necessary to test an important technical index, "load transient response", which includes output response and recovery time; when the load of the DC / DC or AC / DC converter jumps between no load, half load and full load, the maximum value of the fluctuating voltage is the output response, and the time required for the fluctuating voltage to return to within ±1% of the stable value is the recovery time.

[0003] The existing load transient response test can directly measure the output response by using the peak measurement function of an oscilloscope, and the recovery time can also be measured by an oscilloscope, but it is necessary to manually adjust parameters such as the trigger edge, threshold, time base and amplitude of the oscilloscope according to different transient response waveforms, resulting in cumbersome parameter settings, making it difficult to achieve automated testing of load transient response and having low convenience. Summary of the Invention

[0004] The main object of the present invention is to provide a method for testing the transient response of a DC power module, aiming to solve the problems that the existing load transient response test needs to manually adjust parameters such as the trigger edge, threshold, time base and amplitude of the oscilloscope according to different transient response waveforms, resulting in cumbersome parameter settings, difficult to achieve automated testing and low convenience.

[0005] To achieve the above object, the present invention proposes a method for testing the transient response of a DC power module, the method for testing the transient response of the DC power module includes: Obtain a sampling signal; Calculate the output response and recovery time according to the sampling signal.

[0006] In an embodiment, the specific steps of calculating the recovery time according to the sampling signal are: Convert the sampling signal into an actual voltage function V = [(D data value - Y reference ) * Y increment + Y origin and a time function T = [(N data point number - X reference ) * X increment + X origin , where D data value is the sampling value, Y reference is the voltage reference value, Y increment is the voltage increment, Y originis the origin voltage value, N data point number is the number of sampling points; X reference is the time reference value, X increment is the time increment, X origin is the time origin value; Calculate the actual voltage value according to the voltage function, and generate a two-dimensional array in one-to-one correspondence between the sampling value and the actual voltage value; Find the positive voltage peak Vomax from the two-dimensional array, find the sampling point N1 when the voltage is zero to the left starting from Vomax, find the sampling point N2 when the voltage is V X at the right starting from Vomax, and according to the formula t x = [(N x - X reference ) * X increment + X origin Calculate the positive rising time point t1 and the positive falling time point t2, and then subtract the positive rising time point t1 from the positive falling time point t2 to calculate the positive recovery time as: (N2 - N1) * X increment ; Find the negative voltage peak Vomin from the two-dimensional array, find the sampling point N3 when the voltage is zero to the left starting from Vomin, find the sampling point N4 when the voltage is -V X at the right starting from Vomin, and according to the formula t x = [(N x - X reference ) * X increment + X origin Calculate the negative falling time point t3 and the negative rising time point t4, and then subtract the negative falling time point t3 from the negative rising time point t4 to calculate the negative recovery time as: (N4 - N3) * X increment ; Compare the positive recovery time and the negative recovery time, and take the maximum value as the recovery time.

[0007] In one embodiment, the voltage stability value of the sampling signal is Vo, and the V X = Vo * 1%.

[0008] In one embodiment, the specific steps for calculating the output response according to the sampling signal are: Compare the positive voltage peak Vomax with the negative voltage peak Vomin, and take the maximum value as the output response.

[0009] The present invention also provides a transient response test system for a DC power supply module. The transient response test system for the DC power supply module is used to implement the above-mentioned transient response test method for the DC power supply module. The transient response test system for the DC power supply module includes: An acquisition module, which is used to detect the transient response waveform of the DC power supply module and output a corresponding sampling signal; A processing module, which is used to process the data of the sampling signal and calculate and output the response and recovery time according to the sampling signal.

[0010] In one embodiment, the acquisition module includes a data acquisition card.

[0011] In one embodiment, the acquisition module further includes an oscilloscope.

[0012] The technical solution of the present invention detects the transient response waveform of the DC power supply module through the acquisition module and outputs a corresponding sampling signal. The control terminal receives the sampling signal and performs data processing and calculation on the sampling signal data based on the MATLAB language to obtain the output response and recovery time, realizing the automatic test of the transient response of the DC power supply module, which is more convenient and the test result is more accurate. Description of the Drawings

[0013] Figure 1 It is a schematic flow chart of the transient response test method for the DC power supply module of the present invention; Figure 2 It is a schematic test principle diagram of the transient response test method for the DC power supply module of the present invention; Figure 3 It is a schematic module diagram of the transient response test system for the DC power supply module of the present invention. Detailed Embodiments

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0016] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0018] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "arrangement", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The existing load transient response test can directly measure the output response by using the peak measurement function of an oscilloscope, or can measure the recovery time through an oscilloscope. However, it is necessary to manually adjust parameters such as the trigger edge, threshold, time base, and amplitude of the oscilloscope according to different transient response waveforms, resulting in the problem of cumbersome parameter setting, making it difficult to achieve automated testing of load transient response and with low convenience.

[0021] To solve the above problems, the present invention proposes a transient response test method for a DC power supply module. The following will describe the specific embodiments of the present invention in detail with reference to the drawings.

[0022] As Figures 1 - 3 shown, the transient response test method for a DC power supply module includes the following steps: Obtain a sampling signal; Calculate the output response and recovery time according to the sampling signal.

[0023] In one embodiment, the specific steps for calculating the recovery time according to the sampling signal are: Convert the sampling signal into an actual voltage function V = [(D data value - Yreference ) * Y increment +Y origin and the time function T = [(N data point number - X reference ) * X increment + X origin , where D data value is the sampled value, Y reference is the voltage reference value, Y increment is the voltage increment, Y origin is the origin voltage value, N data point number is the number of sampling points; X reference is the time reference value, X increment is the time increment, X origin is the time origin value; Calculate the actual voltage value according to the voltage function, and generate a two-dimensional array in one-to-one correspondence between the sampled value and the actual voltage value; Find the positive voltage peak Vomax from the two-dimensional array, find the sampling point N1 when the voltage is zero starting from Vomax to the left, find the sampling point N2 when the voltage is V X at the starting point of Vomax to the right, and calculate the positive rising time point t1 and the positive falling time point t2 according to the formula t x =[(N x - X reference ) * X increment + X origin . Then subtract the positive rising time point t1 from the positive falling time point t2 to calculate that the positive recovery time is (N2 - N1) * X increment ; Find the negative voltage peak Vomin from the two-dimensional array, find the sampling point N3 when the voltage is zero starting from Vomin to the left, find the sampling point N4 when the voltage is -V X at the starting point of Vomin to the right, and calculate the negative falling time point t3 and the negative rising time point t4 according to the formula t x =[(N x - X reference ) * X increment + X origin . Then subtract the negative falling time point t3 from the negative rising time point t4 to calculate that the negative recovery time is (N4 - N3) * X increment ; Compare the positive recovery time and the negative recovery time, and take the maximum value as the recovery time.

[0024] In one embodiment, the voltage stability value of the sampling signal is Vo, and the VX = Vo * 1%.

[0025] In one embodiment, the specific steps for calculating the output response based on the sampling signal are as follows: Compare the positive voltage peak Vomax with the negative voltage peak Vomin, and take the maximum value as the output response.

[0026] The output response in this embodiment is the maximum value of the fluctuating voltage when the load of the DC power supply module jumps between no load, half load, and full load, and the recovery time is the time required for the fluctuating voltage to return to within ±1% of the stable value; where the voltage stable value is set to Vo.

[0027] It can be understood that first, a data acquisition card or collector, etc., is used to acquire the transient response waveform data of the DC power supply module and output the corresponding acquisition signal, and then the acquisition signal is processed by the "control terminal". Among them, the acquisition signal includes the sampling value D data value , voltage reference value Y reference , voltage increment Y increment , and origin voltage value Y origin . Specifically, the stable value of the sampling signal is 28V, that is, V X = Vo * 1% = 0.28V. In this embodiment, X increment = 6.25E-007s is taken. The control terminal first converts the sampling signal into the actual voltage function V = [(D data value - Y reference ) * Y increment + Y origin and the time function T = [(N data point number - X reference ) * X increment + X origin . In the formula, D data value is the sampling value, Y reference is the voltage reference value, that is, the set voltage compensation value, Y increment is the voltage increment, Y origin is the origin voltage value, generally 0V, N data point number is the number of sampling points; X reference is the time reference value, that is, the set time delay value, X increment is the time increment, X originis the time origin value, generally 0; then, calculate the actual voltage value according to the actual voltage function, and incorporate the actual voltage values corresponding to N consecutive sampling points into the measurement set to form a two-dimensional array; then, find the positive voltage peak Vomax = 0.78V from the two-dimensional array, and search leftward from Vomax to find the sampling point N1 = 2162 when the voltage is zero, and search rightward from Vomax to find the sampling point N2 = 2879 when the voltage is 0.28V, and calculate the positive rise time point t1 and the positive fall time point t2 according to the formula t x =[(N x - X reference ) * X increment + X origin Calculate the positive rise time point t1 and the positive fall time point t2, and then subtract the positive rise time point from the positive fall time point to calculate the positive recovery time as (N2 - N1) *X increment = 448.1 μs; among them, the waveform data of the positive maximum peak in the array is shown in Table 1: Voltage 0 0.04 0.04 0 … 0 … 0.78 … 0.28 … 0.02 0 0 0 Sampling point 0 1 2 3 … 2162 … 2521 … 2879 … 15995 15996 15997 15998 Table 1 Then, find the negative voltage peak Vomin = -0.84V from the two-dimensional array, search leftward from Vomin to find the sampling point N3 when the voltage is zero, and search rightward from Vomin to find the sampling point N4 when the voltage is -0.28V, and calculate the negative fall time point t3 and the negative rise time point t4 according to the formula t x =[(N x - X reference ) * X increment + X origin Calculate the negative fall time point t3 and the negative rise time point t4, and then subtract the negative fall time point from the negative rise time point to calculate the negative recovery time as (N4 - N3) *X increment = 655.6 μs; among them, the waveform data of the negative minimum peak in the array is shown in Table 2: Voltage 0 0.04 0.04 0 … 0 … -0.84 … -0.28 … 0.02 0 0 0 Sampling point 0 1 2 3 … 229 … 920 … 1278 … 15995 15996 15997 15998 Table 2 Finally, compare the positive recovery time and the negative recovery time, and take the maximum value as the recovery time, that is, the recovery time is 655.6 μs. The test method for this recovery time does not require manually adjusting the trigger edge, threshold, time base, amplitude and other parameters of the oscilloscope in real time according to different transient response waveforms, and has a high degree of automation and is more convenient.

[0028] In this embodiment, compare the positive voltage peak Vomax with the negative voltage peak Vomin, and take the maximum value as the output response. The output response can be calculated as 0.84V through the formula VLOR = Max{abs(Vomax), abs(Vomin)}.

[0029] The transient response test method of the DC power supply module of the present invention detects the transient response waveform of the DC power supply module through the "acquisition module" and outputs the corresponding sampling signal. The control terminal receives the sampling signal and performs data processing and calculation on the sampling signal data based on the MATLAB language to obtain the output response and recovery time, realizing the automatic test of the transient response of the DC power supply module, which is more convenient and the test results are more accurate.

[0030] In order to verify that the test results obtained by the transient response test method of the DC power supply module of the present invention are more accurate, the following provides a comparison between the manual test data results and the test data results obtained by this method: A standard sine wave signal is used for verification. The half-cycle time of the waveform is measured at different frequencies. The verification data for the standard amplitude test is shown in Table 3:

[0031] Table 3 The DC power supply module is loaded with a dynamic load: (75%-100%)Iomax, di / dt = 1A / μs, T = 2ms. The comparison between the manual test data and the transient response test data of this method is shown in Table 4:

[0032] Table 4 As can be seen from the above table, compared with the data measured by the manual test method, the data measured by the transient response test method of the present invention has a smaller deviation and better repeatability.

[0033] The present invention also proposes a transient response test system for a DC power supply module. The transient response test system for the DC power supply module is used to implement the above transient response test method for the DC power supply module; the specific steps of the transient response test method for the DC power supply module refer to the above embodiments. Since the transient response test system for the DC power supply module adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0034] The transient response test system for the DC power supply module includes: An acquisition module, which is used to detect the transient response waveform of the DC power supply module and output the corresponding sampling signal; A processing module, which is used to perform data processing on the sampling signal and calculate the output response and recovery time according to the sampling signal.

[0035] In one embodiment, the acquisition module includes a data acquisition card.

[0036] In one embodiment, the acquisition module further includes an oscilloscope.

[0037] In this embodiment, the acquisition module can be implemented by any acquisition module that can measure the transient response waveform of the DC power supply module and output the corresponding sampling signal, such as a data acquisition card, a data collector, or an oscilloscope, etc.; the processing module can be implemented by a terminal such as a computer or an industrial control computer. Specifically, first, the acquisition module measures the transient response waveform of the DC power supply module and outputs the corresponding sampling signal; then, the processing module processes and calculates the sampling signal according to the above transient response test method of the DC power supply module to calculate and output the response and recovery time, realizing the automated test of the transient response, so as to conveniently, quickly, and accurately measure the transient response of the DC power supply module.

[0038] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for testing transient response of a DC power supply module, characterized in that: The DC power supply module transient response test method comprises the following steps: Get the sampling signal; Output response and recovery time are calculated based on the sampled signal.

2. The method for testing transient response of a DC power supply module according to claim 1, characterized in that: The specific steps of calculating the recovery time according to the sampling signal are: The sampled signal is converted into an actual voltage function V = [(D data value -Y reference ) * Y increment ] + Y origin And the time function T = [(N data point number -X reference ) * X increment ] + X origin , where D data value is the sampling value, Y reference is the voltage reference value, Y increment is the voltage increment, Y origin is the origin voltage value, N data point number is the number of sampling points; X reference is the time reference value, X increment is the time increment, X origin is the time origin value; Calculate the actual voltage value according to the actual voltage formula, and generate a two-dimensional array of sampling value-actual voltage value in one-to-one correspondence; Find the forward voltage peak value Vomax from the two-dimensional array, start from Vomax and search to the left for the sampling point N1 when the voltage is zero, start from Vomax and search to the right for the voltage V X The sampling point N2 at the time, and according to the formula t x =[(N x -X reference ) * X increment ] + X origin Calculate the positive rising time point t1 and the positive falling time point t2, and then subtract the positive rising time point t1 from the positive falling time point t2 to calculate the positive recovery time as (N2-N1)*X increment ; Find the negative voltage peak value Vomin from the two-dimensional array, start from Vomin and search to the left for the sampling point N3 when the voltage is zero, start from Vomin and search to the right for the sampling point N4 when the voltage is -V X The sampling point N4 at the time, and according to the formula t x =[(N x -X reference ) * X increment ] + X origin Calculate the negative falling time point t3 and the negative rising time point t4, and then subtract the negative falling time point t3 from the negative rising time point t4 to calculate the negative recovery time as (N4-N3)*X increment ; The positive recovery time and the negative recovery time are compared, and the maximum value is taken as the recovery time.

3. The method for testing transient response of a DC power supply module according to claim 2, characterized in that: The voltage stability value of the sampling signal is Vo, and the V X =Vo*1%.

4. The method for testing transient response of a DC power supply module according to claim 2, characterized in that: The specific steps of calculating the output response according to the sampling signal are: The forward voltage peak value Vomax is compared with the negative voltage peak value Vomin, and the obtained maximum value is used as the output response.

5. A DC power supply module transient response test system, characterized in that: The DC power module transient response test system is used to implement the DC power module transient response test method according to any one of claims 1 to 4, and the DC power module transient response test system includes: An acquisition module, the acquisition module is used to detect the transient response waveform of the DC power supply module and output a corresponding sampling signal; A processing module is used to perform data processing on the sampling signal and calculate an output response and a recovery time according to the sampling signal.

6. The DC power supply module transient response test system according to claim 5, characterized in that: The acquisition module includes a data acquisition card.

7. The DC power supply module transient response test system according to claim 5, characterized in that: The acquisition module also includes an oscilloscope.

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