DC power module transient response test method and system

Abstract

The present invention discloses a method and system for testing the transient response of a DC power supply module. The method detects the transient response waveform of the DC power supply module through an acquisition module and outputs a corresponding sampling signal. A 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, thereby realizing automated testing of the transient response of the DC power supply module. The method is more convenient and the test results are more accurate.

Description

Technical Field

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

[0002] During the screening test of hybrid integrated circuit DC / DC or AC / DC converters, a key technical indicator, "load transient response," needs to be tested. This 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] Existing load transient response tests can use the peak measurement function of an oscilloscope to directly measure the output response, and can also use the oscilloscope to measure the recovery time. However, the oscilloscope's trigger edge, threshold, time base, amplitude and other parameters need to be manually adjusted according to different transient response waveforms. The parameter settings are cumbersome, making it difficult to achieve automated testing of load transient response and inconvenient. Summary of the Invention

[0004] The main purpose of the present invention is to provide a DC power supply module transient response test method, which aims to solve the problems of the existing load transient response test requiring manual adjustment of the oscilloscope's trigger edge, threshold, time base and amplitude according to different transient response waveforms, resulting in cumbersome parameter settings, difficulty in achieving automated testing, and low convenience.

[0005] To achieve the above objectives, the present invention provides a method for testing the transient response of a DC power supply module, the method comprising:

[0006] Get the sampling signal;

[0007] Output response and recovery time are calculated based on the sampled signal.

[0008] In one embodiment, the specific steps of calculating the recovery time according to the sampled signal are:

[0009] 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, Yincrement 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;

[0010] Calculate the actual voltage value according to the voltage function and generate a two-dimensional array with a one-to-one correspondence between the sampled value and the actual voltage value;

[0011] 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: (N2-N1)*X increment ;

[0012] Find the negative voltage peak 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 N3 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: (N4-N3)*X increment ;

[0013] The positive recovery time and the negative recovery time are compared, and the maximum value is taken as the recovery time.

[0014] In one embodiment, the voltage stability value of the sampling signal is Vo, and the V X =Vo*1%.

[0015] In one embodiment, the specific steps of calculating the output response according to the sampled signal are:

[0016] 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.

[0017] The present invention also provides a DC power module transient response test system, which is used to implement the above-mentioned DC power module transient response test method. The DC power module transient response test system includes:

[0018] 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;

[0019] 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.

[0020] In one embodiment, the acquisition module includes a data acquisition card.

[0021] In one embodiment, the acquisition module further includes an oscilloscope.

[0022] The technical solution of the present invention detects the transient response waveform of the DC power supply module through an 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, thereby realizing automated transient response testing of the DC power supply module, which is more convenient and has more accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the process of the transient response test method of the DC power supply module of the present invention;

[0024] Figure 2 This is a test principle diagram of the DC power module transient response test method of the present invention;

[0025] Figure 3 This is a module schematic diagram of the DC power supply module transient response test system of the present invention. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean 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; it can also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] Existing load transient response tests can use the peak measurement function of an oscilloscope to directly measure the output response, and can also use the oscilloscope to measure the recovery time. However, the oscilloscope's trigger edge, threshold, time base, amplitude and other parameters need to be manually adjusted according to different transient response waveforms. The parameter settings are cumbersome, making it difficult to achieve automated testing of load transient response and inconvenient.

[0033] In order to solve the above problems, the present invention proposes a method for testing transient response of a DC power supply module. The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-3 As shown, the DC power module transient response test method includes the following steps:

[0035] Get the sampling signal;

[0036] Output response and recovery time are calculated based on the sampled signal.

[0037] In one embodiment, the specific steps of calculating the recovery time according to the sampled signal are:

[0038] 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;

[0039] Calculate the actual voltage value according to the voltage function and generate a two-dimensional array with a one-to-one correspondence between the sampled value and the actual voltage value;

[0040] 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 ;

[0041] Find the negative voltage peak 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 N3 when the voltage is -V X The sampling point N4 at the time, and according to the formula t x =[(N x -X reference ) * Xincrement ] + 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 ;

[0042] The positive recovery time and the negative recovery time are compared, and the maximum value is taken as the recovery time.

[0043] In one embodiment, the voltage stability value of the sampling signal is Vo, and the V X =Vo*1%.

[0044] In one embodiment, the specific steps of calculating the output response according to the sampled signal are:

[0045] 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.

[0046] In this embodiment, the output response is the maximum value of the fluctuating voltage when the load of the DC power 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 the range of ±1% of the stable value; wherein the voltage stability value is set to Vo.

[0047] It can be understood that the transient response waveform data of the DC power module is first collected by an acquisition module such as a data acquisition card or a collector and the corresponding acquisition signal is output, and then the acquisition signal is processed by the "control terminal", wherein the acquisition signal includes the sampling value D data value , voltage reference value Y reference , voltage increment Y increment And the 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, take X increment =6.25E-007s, 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 , where 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, Yorigin is the origin voltage value, usually 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 origin is the time origin value, which is 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 forward voltage peak value Vomax=0.78V from the two-dimensional array, and use Vomax as the starting point to search to the left for the sampling point N1=2162 when the voltage is zero, and use Vomax as the starting point to search to the right for the sampling point N2=2879 when the voltage is 0.28V, and then use 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, then subtract the positive rise time point from the positive fall time point to calculate the positive recovery time as (N2-N1) *X increment =448.1μs; the maximum forward peak waveform data in the array is shown in Table 1:

[0048] 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

[0049] Table 1

[0050] Then search the negative voltage peak value Vomin=-0.84V from the two-dimensional array, and search the sampling point N3 when the voltage is zero to the left with Vomin as the starting point, and search the sampling point N4 when the voltage is -0.28V to the right with Vomin as the starting point, 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, then subtract the negative falling time point from the negative rising time point to calculate the negative recovery time as (N4-N3) *X increment =655.6μs; the negative minimum peak waveform data in the array is shown in Table 2:

[0051] 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

[0052] Table 2

[0053] Finally, the positive recovery time and negative recovery time are compared, and the maximum value obtained is taken as the recovery time, that is, the recovery time is 655.6μs. This recovery time test method does not require manual real-time adjustment of the oscilloscope's trigger edge, threshold, time base, amplitude and other parameters according to different transient response waveforms. It has a high degree of automation and is more convenient.

[0054] In this embodiment, the forward voltage peak value Vomax is compared with the negative voltage peak value Vomin, and the maximum value obtained is used as the output response. The output response can be calculated as 0.84V using the formula VLOR=Max{abs(Vomax),abs(Vomin)}.

[0055] The DC power module transient response test method of the present invention detects the transient response waveform of the DC power module through an "acquisition module" and outputs a corresponding sampling signal. A 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, thereby realizing automated transient response testing of the DC power module, which is more convenient and has more accurate test results.

[0056] In order to verify that the test results of the DC power module transient response test method 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:

[0057] A standard sine wave signal was used for verification, and the half-cycle time of the waveform was measured at different frequencies. The standard amplitude test verification data is shown in Table 3:

[0058]

[0059] Table 3

[0060] The DC power module is loaded with a dynamic load of (75%-100%) Iomax, di / dt = 1A / μs, T = 2ms. The manual test data is compared with the transient response test data of this method as shown in Table 4:

[0061]

[0062] Table 4

[0063] 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 smaller deviation and better repeatability.

[0064] The present invention also provides a DC power supply module transient response test system, which is used to implement the above-mentioned DC power supply module transient response test method; the specific steps of the DC power supply module transient response test method refer to the above-mentioned embodiments. Since the DC power supply module transient response test system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which are not detailed here.

[0065] The DC power supply module transient response test system includes:

[0066] 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;

[0067] 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.

[0068] In one embodiment, the acquisition module includes a data acquisition card.

[0069] In one embodiment, the acquisition module further includes an oscilloscope.

[0070] In this embodiment, the acquisition module can be implemented using any module capable of measuring the transient response waveform of a DC power supply module and outputting a corresponding sampled signal, such as a data acquisition card, a data collector, or an oscilloscope. The processing module can be implemented using a terminal such as a computer or an industrial personal computer. Specifically, the acquisition module first measures the transient response waveform of the DC power supply module and outputs a corresponding sampled signal. The processing module then processes and calculates the sampled signal according to the aforementioned DC power supply module transient response test method to calculate the output response and recovery time, thereby implementing automated transient response testing and facilitating convenient, rapid, and accurate measurement of the DC power supply module's transient response.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection 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; Calculate the output response and recovery time according to the sampling signal; 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 function, and generate a two-dimensional array with a one-to-one correspondence between the sampling value and the actual voltage value; 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 = [(N data point number -X reference ) * X increment ] 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, 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 N3 when the voltage is -V X The sampling point N4 at the time, and according to the formula T = [(N data point number -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.

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

3. The method for testing transient response of a DC power supply module according to claim 1, wherein: 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.

4. 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 3, 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.

5. The DC power module transient response test system according to claim 4, characterized in that: The acquisition module includes a data acquisition card.

6. The DC power supply module transient response test system according to claim 4, characterized in that: The acquisition module also includes an oscilloscope.

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