CN113702858A - Dynamic response testing device of switching power supply - Google Patents
Dynamic response testing device of switching power supply Download PDFInfo
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Abstract
The invention provides a dynamic response testing device of a switching power supply, which considers that the efficiency and the accuracy of manual testing are low, in the application, a control module firstly determines a threshold value of a load current of a load module and a change mode of the load current based on a user instruction, the load module can change the load current based on the threshold value of the load current and the change mode of the load current, a power supply module can supply power for the switching power supply to be tested, an acquisition module can test an output voltage value of the switching power supply to be tested when the load current changes, and then the control module judges whether the output voltage value is in a preset output voltage range based on the output voltage value of the switching power supply to be tested, so that whether the dynamic response of the switching power supply to be tested meets the requirements can be judged. Through the device, do not need artifical manual to go on, reduced the cost of labor, saved test time, can effectively improve switching power supply's dynamic response test's efficiency and accuracy.
Description
Technical Field
The invention relates to the technical field of automatic testing of a switching power supply, in particular to an automatic testing system of the switching power supply.
Background
A switching power supply is a high-frequency switching type electric energy conversion device, has many advantages such as small size, light weight, wide voltage stabilizing range, and good filtering effect, and is often used as a power supply for electronic devices. With the increase of the operating speed and the current demand of the electronic device, when the current of the electronic device changes transiently, the output voltage of the switching power supply is required to be maintained within a certain tolerance range to ensure the stable operation of the circuit, and therefore, the dynamic response test of the switching power supply is particularly important.
In the prior art, the dynamic response test of the switching power supply can only be manually performed, the test must be performed by manually operating the oscilloscope, and after a test result is obtained, the stored data is manually copied and sorted into the record table, so that more manpower and time are consumed, and the test efficiency and accuracy are lower.
Disclosure of Invention
The invention aims to provide a dynamic response testing device of a switching power supply, which does not need manual operation, reduces the labor cost, saves the testing time and can effectively improve the efficiency and the accuracy of the dynamic response testing of the switching power supply.
In order to solve the above technical problem, the present invention provides a dynamic response testing apparatus for a switching power supply, including:
the input end of the load module is connected with the output end of the tested switching power supply and is used for changing the load current based on the threshold value of the load current and the change mode of the load current;
the output end of the power supply module is connected with the input end of the switch power supply to be tested and used for supplying power to the switch power supply to be tested;
the input end of the acquisition module is connected with the output end of the tested switching power supply and is used for testing the output voltage value of the tested switching power supply when the load current of the load module changes;
and the control module is respectively connected with the load module and the control end of the acquisition module and is used for determining the threshold value of the load current of the load module and the change mode of the load current based on a user instruction, judging whether the output voltage value of the tested switching power supply is within a preset output voltage range, and if so, judging that the dynamic response of the tested switching power supply meets the requirement.
Preferably, the power module is a dc power supply, and an output terminal of the dc power supply is connected to an input terminal of the tested switching power supply, and is configured to supply power to the tested switching power supply.
Preferably, the switch power supply to be tested is arranged on the main board;
the power module further includes:
and the PSU is used for supplying power to the tested switching power supply through the mainboard.
Preferably, the power supply further comprises a controllable switch, a first end of the controllable switch is connected with a mains supply, a second end of the controllable switch is connected with the input end of the PSU, and a control end of the controllable switch is connected with the direct-current power supply;
the control module is also used for controlling the direct-current power supply to supply power to the switch power supply to be tested, or sending a closing instruction of the controllable switch to the direct-current power supply;
and the direct current power supply is also used for controlling the controllable switch to be closed after receiving a closing instruction of the controllable switch, so that the PSU supplies power to the switch power supply to be tested through the mainboard.
Preferably, the controllable switch is a relay.
Preferably, the user instruction comprises an input voltage value of the switching power supply to be tested;
controlling the direct current power supply to supply power to the switch power supply to be tested, comprising:
and controlling the direct current power supply to output the input voltage value so as to supply power to the switch power supply to be tested.
Preferably, the acquisition module is further configured to test a load current value of the load module, and display a waveform of an output voltage value of the tested switching power supply changing with the load current value of the load module.
Preferably, the device also comprises a display module; the control module is also used for controlling the display module to display the judgment result whether the dynamic response of the tested switching power supply meets the requirement.
Preferably, the user instruction further includes a design output voltage value of the switching power supply to be tested;
the preset output voltage range is from the designed output voltage value of the tested switching power supply to 0.97 to 1.03.
Preferably, the user command includes a full load output current value;
determining the threshold value of the load current based on a user instruction, comprising:
when the full-load output current value is smaller than a standard current threshold value, determining that a large current threshold value of the load current is 90% of the full-load output current value, and a small current threshold value is 10% of the full-load output current value;
when the full-load output current value is not less than a standard current threshold value, determining that a first large-current threshold value of the load current is 50% of the full-load output current value, and a first small-current threshold value is 0% of the full-load output current value; the second large current threshold is 100% of the full-load output current value, and the second small current threshold is 50% of the full-load output current value.
The invention provides a dynamic response testing device of a switching power supply, wherein a control module determines a threshold value of a load current of a load module and a change mode of the load current based on a user instruction, the load module can change the load current based on the threshold value of the load current and the change mode of the load current, a power supply module can supply power for a tested switching power supply, an acquisition module can test an output voltage value of the tested switching power supply when the load current changes, and then the control module judges whether the output voltage value is in a preset output voltage range based on the output voltage value of the tested switching power supply, so that whether the dynamic response of the tested switching power supply meets requirements can be judged. Therefore, the control module, the load module, the power module and the acquisition module are matched with each other to work, so that the dynamic response test of the switch power supply to be tested is realized, manual operation is not needed, the labor cost is reduced, the test time is saved, and the efficiency and the accuracy of the dynamic response test of the switch power supply can be effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dynamic response testing apparatus of a switching power supply provided in the present application;
fig. 2 is a schematic structural diagram of another dynamic response testing apparatus for a switching power supply provided in the present application;
fig. 3 is a flowchart of a dynamic response test of a switching power supply provided in the present application.
Detailed Description
The core of the invention is to provide the dynamic response testing device of the switching power supply, which does not need manual operation, reduces the labor cost, saves the testing time, and can effectively improve the efficiency and the accuracy of the dynamic response testing of the switching power supply.
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dynamic response testing apparatus of a switching power supply provided in the present application.
The invention provides a dynamic response testing device of a switching power supply, which comprises:
the load module 1 is connected with the output end of the tested switching power supply at the input end of the load module 1 and used for changing the load current based on the threshold value of the load current and the change mode of the load current;
the output end of the power supply module 2 is connected with the input end of the switch power supply to be tested and used for supplying power to the switch power supply to be tested;
the input end of the acquisition module 3 is connected with the output end of the tested switching power supply and is used for testing the output voltage value of the tested switching power supply when the load current of the load module 1 changes;
and the control module 4 is connected with the control ends of the load module 1 and the acquisition module 3 respectively, and is used for determining the threshold value of the load current of the load module 1 and the change mode of the load current based on a user instruction, judging whether the output voltage value of the tested switching power supply is within a preset output voltage range, and if so, judging that the dynamic response of the tested switching power supply meets the requirement.
In consideration of the fact that manual operation consumes more manpower and time and the testing efficiency and accuracy are lower when the dynamic response of the switching power supply is tested, the application provides the dynamic response testing device of the switching power supply, and the dynamic response testing device of the switching power supply comprises a load module 1, a power module 2, an acquisition module 3 and a control module 4. Specifically, when the dynamic response testing device of the switching power supply operates, the control module 4 determines the threshold value of the load current and the change mode of the load current of the load module 1 based on the user instruction and sends a control instruction to the load module 1. The load module 1 can simulate the performance influence of different loads on the switch power supply to be tested, the load module 1 receives the threshold value of the load current and the change mode of the load current, and changes the load current based on the threshold value of the load current and the change mode of the load current, so that the dynamic response of the switch power supply to be tested when the load current dynamically changes can be obtained subsequently. The power module 2 can supply power to the switch power supply to be tested. After receiving the input voltage provided by the power module 2, the switching power supply to be tested performs dc conversion on the input voltage based on the switching frequency Fsw to obtain an output voltage, and the acquisition module 3 tests the output voltage value of the switching power supply to be tested when the load current of the load module 1 changes. The control module 4 reads the output voltage value of the tested switching power supply tested by the acquisition module 3, compares the output voltage value with the preset output voltage range to judge whether the output voltage value of the tested switching power supply is in the preset output voltage range, judges that the dynamic response of the tested switching power supply meets the requirement if the output voltage value of the tested switching power supply is in the preset output voltage range, and judges that the dynamic response of the tested switching power supply does not meet the requirement if the output voltage value of the tested switching power supply is not in the preset output voltage range.
In addition, the load module 1 may obtain the threshold value of the load current and the variation mode of the load current through a USB-GPIB (Universal Serial-General Bus-General Interface Bus). The control module 4 can read the output voltage value of the tested switching power supply tested by the acquisition module 3 through the USB-GPIB. Of course, the load module 1 and the control module 4, and the control module 4 and the collection module 3 may also communicate with each other in other manners, and the present application is not limited thereto.
In addition, the load module 1 may be, but is not limited to, a load meter, and the load meter is connected to the switching power supply to be tested through a load line, so that the load module has the advantages of flexible use, energy saving and the like.
The acquisition module 3 may be, but is not limited to, an oscilloscope.
The power module 2 may be a power supply for converting the commercial power into a direct current, or may be a direct current power supply 21, and the like, and the present application is not limited in particular.
To sum up, the switching power supply's of this application dynamic response testing arrangement, control module 4 and load module 1, power module 2 and collection module 3 work of mutually supporting realize not needing artifical manual the going on to the test of the dynamic response of the switching power supply that awaits measuring, have reduced the cost of labor, have saved test time, can effectively improve switching power supply's dynamic response test's efficiency and accuracy.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic structural diagram of another dynamic response testing apparatus for a switching power supply provided in the present application.
As a preferred embodiment, the power module 2 is a dc power supply 21, and an output terminal of the dc power supply 21 is connected to an input terminal of the tested switching power supply for supplying power to the tested switching power supply.
In order to realize the accuracy of the dynamic response test of the switching power supply, in this embodiment, the power module 2 can select the dc power supply 21 for use, the output end of the dc power supply 21 is directly connected with the input end of the tested switching power supply, and the dc voltage can be directly applied to the input end of the switching power supply, so that the output voltage value of the tested switching power supply is stabilized within the preset output voltage range when the load current changes, and the test accuracy is ensured.
As a preferred embodiment, the tested switching power supply is arranged on the mainboard;
the power module 2 further includes:
PSU22, PSU22 are used for supplying power for the switching power supply to be tested through the mainboard.
In order to simulate the test requirement of the switching Power Supply during normal operation, in this embodiment, the switching Power Supply to be tested is disposed on the motherboard, the motherboard is a PCB (Printed Circuit Board) Board, Power module 2 can also select PSU22(Power Supply Unit, Power Supply device) for use, in the test process, PSU22 can output voltage to the motherboard, PSU22 applies the output voltage to the motherboard, the motherboard converts the voltage into the voltage required by the normal operation of the switching Power Supply to be tested, and then provides the converted voltage to the switching Power Supply to be tested, thereby realizing Power Supply to the switching Power Supply to be tested.
In addition, this example is convenient for the user to carry out the power supply mode selection of power module 2 according to actual test demand through setting up two kinds of power supply modes.
As a preferred embodiment, the system further comprises a controllable switch 23, a first end of the controllable switch 23 is connected to the commercial power, a second end of the controllable switch 23 is connected to the input end of the PSU22, and a control end of the controllable switch 23 is connected to the dc power supply 21;
the control module 4 is further configured to control the dc power supply 21 to supply power to the switching power supply to be tested, or send a closing instruction of the controllable switch 23 to the dc power supply 21;
the direct current power supply 21 is further configured to control the controllable switch 23 to be turned on after receiving the turn-on instruction of the controllable switch 23, so that the PSU22 supplies power to the switching power supply to be tested through the motherboard.
In order to realize the automatic control of the power module 2 to the tested switching power supply, in this embodiment, the dynamic response testing apparatus of the switching power supply further includes a controllable switch 23, a first end of the controllable switch 23 is connected to the utility power, a second end of the controllable switch 23 is connected to the input end of the PSU22, and a control end of the controllable switch 23 is connected to the dc power supply 21. A user selects a power supply mode of the switch power supply to be tested in the control module 4, and if the power supply mode is the direct current power supply 21 mode, the control module 4 controls the direct current power supply 21 to supply power to the switch power supply to be tested; if the mode is the PSU22 mode, the control module 4 sends a closing instruction of the controllable switch 23 to the dc power supply 21, and the dc power supply 21 controls the controllable switch 23 to be closed after receiving the closing instruction of the controllable switch 23, so that the PSU22 supplies power to the switching power supply to be tested through the motherboard.
Furthermore, PSU22 may be an AC-DC (Alternating Current-Direct Current) power supply for converting mains electricity into Direct Current electricity.
As a preferred embodiment, the controllable switch 23 is a relay.
In this embodiment, the controllable switch 23 may be a relay, and is an automatic switch for controlling a large current with a small current, and when the automatic switch is in actual operation, the control module 4 controls the dc power supply 21 to output a 5V voltage to control the pull-in of the relay, so that the PSU22 supplies power to the switching power supply to be tested through the motherboard, and the circuit structure is simple.
As a preferred embodiment, the user command includes an input voltage value of the switching power supply to be tested;
controlling the dc power supply 21 to supply power to the switching power supply to be tested, includes:
and controlling the direct current power supply 21 to output an input voltage value to supply power to the switching power supply to be tested.
In this embodiment, when the dynamic response testing apparatus of the switching power supply starts to work, a user inputs a user instruction in the control module 4, where the user instruction includes an input voltage value of the switching power supply to be tested; the control module 4 sets the dc power supply 21 based on the input voltage value of the switching power supply to be tested, so that the output voltage value of the dc power supply 21 is the input voltage value of the switching power supply to be tested in the user instruction.
In addition, the control module 4 may be, but is not limited to, a PC controller, which has the advantages of strong data processing capability, strong network communication function, capability of executing a relatively complex control algorithm, almost unlimited storage capacity, and the like, and the PC controller and the dc power supply 21 may communicate through the USB-GPIB, or may communicate in other manners, which is not limited herein.
As a preferred embodiment, the acquisition module 3 is further configured to test a load current value of the load module 1, and display a waveform of an output voltage value of the tested switching power supply varying with the load current value of the load module 1.
In order to realize the automatic recording of the dynamic response test process of the switching power supply, in this embodiment, the acquisition module 3 may also be configured to test the load current value of the load module 1, and display the waveform of the output voltage value of the tested switching power supply changing with the load current value of the load module 1, so that the control module 4 captures and records the waveform of the acquisition module 3, and determines whether the dynamic response of the tested switching power supply meets the requirement based on the test data.
In addition, the acquisition module 3 may be, but is not limited to, an oscilloscope, where the oscilloscope includes a CH1 interface and a CH2 interface, the oscilloscope CH1 interface reads the output voltage value Vout 'of the switching power supply to be tested through the differential carbon rod, and the oscilloscope CH2 interface reads the load current value Iout' through the current gun.
The mainboard can be further provided with a capacitor, the capacitor is connected with the output end of the tested switching power supply, two flying wires are welded at the two ends of the capacitor, the flying wires are connected to the positive end and the negative end of the acquisition module 3, and the voltage value of the two ends of the capacitor detected by the acquisition module 3 is the output voltage value of the tested switching power supply. In addition, in the dynamic response test process of the switching power supply, the capacitor can be charged and discharged quickly, when the current of the load module 1 changes instantly, the capacitor can also provide a part of current quickly, the response speed is increased, and the output voltage of the tested switching power supply is stabilized.
As a preferred embodiment, the device further comprises a display module; the control module 4 is further configured to control the display module to display a determination result indicating whether the dynamic response of the tested switching power supply meets the requirement.
In this embodiment, the dynamic response testing device of the switching power supply further comprises a display module, the control module 4 controls the display module to display a judgment result whether the dynamic response of the tested switching power supply meets the requirement, and if the output voltage of the tested switching power supply is within the preset output voltage range, the display module displays pass; and if the output voltage of the tested switching power supply is out of the preset output voltage range, the display module displays fail.
As a preferred embodiment, the user instruction includes a design output voltage value of the switching power supply to be tested;
the preset output voltage range is from the designed output voltage value of the tested switching power supply to 0.97 to 1.03.
In this embodiment, when the dynamic response testing apparatus of the switching power supply under test starts to work, a user inputs a user instruction in the control module 4, where the user instruction includes a designed output voltage value Vout of the switching power supply under test;
the preset output voltage range in the application is that "the designed output voltage value Vout x 0.97 of the switching power supply to be tested ≦ the output voltage value Vout' of the switching power supply to be tested ≦ the designed output voltage value Vout x 1.03 of the switching power supply to be tested", and normal operation of the switching power supply to be tested can be guaranteed within the preset output voltage range.
As a preferred embodiment, the user instruction further includes a full-load output current value Imax;
determining a threshold for load current based on a user instruction, comprising:
when the full-load output current value Imax is smaller than the standard current threshold value, determining that the large current threshold value of the load current is 90% of the full-load output current value Imax, and the small current threshold value is 10% of the full-load output current value Imax;
when the full-load output current value Imax is not smaller than the standard current threshold, determining that the first large current threshold of the load current is 50% of the full-load output current value Imax, and the first small current threshold is 0% of the full-load output current value Imax; the second large current threshold is 100% of the full-load output current value Imax, and the second small current threshold is 50% of the full-load output current value Imax.
In this embodiment, when the dynamic response testing apparatus of the tested switching power supply starts to work, a user inputs a user instruction in the control module 4, where the user instruction further includes a full-load output current value; the control module 4 determines the threshold value of the load current and the variation mode of the load current based on the user instruction.
Specifically, the working mode of the load module 1 is set to be CCDH (Constant Current Dynamic High mode);
the dynamic response of the normal work of the switch power supply to be tested is different according to the difference of the full-load output current, and the standard current threshold I is used as the basis for judging the current magnitude in the application.
When the full-load output current value Imax of the tested switching power supply is smaller than the standard current threshold value I, the power supply is usually a power supply with a tail end directly driving a load, and the power supply is characterized by frequent start and stop. When the load does not work, the load is maintained in a standby state, and is maintained in a small load state, and the small current threshold value of the load current can be considered as the load with the full-load output current value Imax of 10 percent in the test. When the switching power supply normally works under the full-load condition, because a peak current can be formed when the current is rapidly changed, if the switching power supply is directly full-load, the peak current can possibly cause the damage of the tested switching power supply, so that the large-current threshold of the load current can be set to be the full-load output current value Imax x 90%, and then the full-load is slowly compensated. Therefore, when testing such a switching power supply, the load current threshold is set to a large current threshold High of the load current, which is the full-load output current value Imax 90%, and a small current threshold Low of the load current, which is the full-load output current value Imax 10%.
When the full-load output current value Imax of the tested switching power supply is not less than the standard current threshold value I, if the load current is from 0 to Imax, the tested switching power supply is easily damaged by violent instantaneous current change. In this case, the switching power supply to be tested has a state change when the load current changes to an intermediate value, so that it is different between a large current operating state and a small current operating state. That is, it is necessary to test the dynamic response of the switching power supply from the first low current threshold value of full-load output current value Imax 0% to the first high current threshold value of full-load output current value Imax 50%, and from the second low current threshold value of full-load output current value Imax 50% to the second high current threshold value of full-load output current value Imax 100%. Therefore, when the switching power supply is tested, the load current threshold is set to be 50% of the full-load output current value Imax as the first large-current threshold of the load current, and 0% of the full-load output current value Imax as the first small-current threshold; the second large current threshold is 100% of the full-load output current value Imax, and the second small current threshold is 50% of the full-load output current value Imax.
The standard current threshold may be a 20A current, and the present application is not particularly limited thereto.
The load current can change under a certain frequency, and the change mode can be determined based on the set large current threshold, small current threshold, large current threshold duration, small current threshold duration, the change rate from the large current threshold to the small current threshold, and the change rate from the small current threshold to the large current threshold.
For example, the large current threshold duration CCDHT1 is 0.5ms, the small current threshold duration CCDHT2 is 0.5ms, the rate of change from the large current threshold to the small current threshold CCDH1 is 2.5A/us, and the rate of change from the small current threshold to the large current threshold CCDH2 is 2.5A/us, which is not limited herein.
The user command also includes the switching frequency Fsw so that the user knows the operating state of the switching power supply under test.
Referring to fig. 3, fig. 3 is a flowchart illustrating a dynamic response test of a switching power supply according to the present disclosure.
To facilitate understanding of the testing process of the dynamic response testing apparatus of the switching power supply provided in the present application, the following describes the testing process of the dynamic response of the switching power supply in detail:
1. and inputting information of the tested switching power supply on the test report template, wherein the information comprises an input voltage value Vin of the tested switching power supply, a designed output voltage value Vout of the tested switching power supply, a switching frequency Fsw and a full-load output current Iout.
2. The PC controller is connected with the oscilloscope, the direct current power supply 21 and the load instrument by the USB-GPIB.
3. The output end of the switch power supply to be tested is connected with the load instrument through a load line, the input end of the switch power supply to be tested is connected with the direct current power supply 21 or the PSU, and a capacitance welding differential line is output at the far end.
4. The oscilloscope CH1 reads the output voltage value Vout 'of the switching power supply to be tested through the differential probe, and the oscilloscope CH2 reads the load current value Iout' through the current gun.
5. Starting the programmed application program and displaying the user interface of the software.
6. The report of reading and saving the waveform data is selected in the user interface, and the power supply mode (dc power supply 21 or PSU) is selected. If the direct current power supply 21 directly supplies power, the PC controller directly controls the direct current power supply 21 to output the input voltage Vin of the switch power supply to be tested; if the PSU is selected to supply power, the PSU is connected to the output end of the relay at the moment, the control end of the relay is connected to the two ends of the direct current power supply 21, and the PC controller controls the direct current power supply 21 to output 5V voltage to control the relay to be attracted so as to finish power supply.
7. And reading the input voltage value Vin of the tested switching power supply, the designed output voltage value Vout of the tested switching power supply, the switching frequency Fsw and the full-load output current Iout in the report, determining a preset output voltage range, and determining the threshold value of the load current of the load instrument and the change mode of the load current. When the full-load output current value is less than 20A, the threshold value of the load current is set: high ═ Imax 90%, Low ═ Imax 10%; when the full-load output current value is not less than 20A, the segmented test is required to be performed twice, and the threshold value of the first load current is set as follows: high ═ Imax 50%, Low ═ Imax 0%; setting the threshold value of the second load current: high is 100% and Low is 50% Imax.
8. Clicking a user interface RUN, starting to operate a program, operating according to a determined power supply mode and a load instrument setting, and after the oscilloscope finishes operating according to the program, transmitting a waveform and test data back to the PC controller.
9. And the program analyzes and processes the data, compares the output voltage value of the tested switching power supply with a preset output voltage range, and judges whether the dynamic response of the tested switching power supply meets the requirement or not.
10. And importing the test result and the waveform into a test report, and displaying the test result pass or fail. And turning off the direct-current power supply 21 and the load instrument to finish the test.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A dynamic response testing apparatus for a switching power supply, comprising:
the input end of the load module is connected with the output end of the tested switching power supply and is used for changing the load current based on the threshold value of the load current and the change mode of the load current;
the output end of the power supply module is connected with the input end of the switch power supply to be tested and used for supplying power to the switch power supply to be tested;
the input end of the acquisition module is connected with the output end of the tested switching power supply and is used for testing the output voltage value of the tested switching power supply when the load current of the load module changes;
and the control module is respectively connected with the load module and the control end of the acquisition module and is used for determining the threshold value of the load current of the load module and the change mode of the load current based on a user instruction, judging whether the output voltage value of the tested switching power supply is within a preset output voltage range, and if so, judging that the dynamic response of the tested switching power supply meets the requirement.
2. The device for testing the dynamic response of the switching power supply according to claim 1, wherein the power module is a dc power supply, and an output terminal of the dc power supply is connected to an input terminal of the switching power supply to be tested, for supplying power to the switching power supply to be tested.
3. The dynamic response testing device of the switching power supply according to claim 2, wherein the switching power supply under test is disposed on a main board;
the power module further includes:
and the PSU is used for supplying power to the tested switching power supply through the mainboard.
4. The switching power supply testing device according to claim 3, further comprising a controllable switch, wherein a first terminal of the controllable switch is connected to a commercial power, a second terminal of the controllable switch is connected to the input terminal of the PSU, and a control terminal of the controllable switch is connected to the DC power supply;
the control module is also used for controlling the direct-current power supply to supply power to the switch power supply to be tested, or sending a closing instruction of the controllable switch to the direct-current power supply;
and the direct current power supply is also used for controlling the controllable switch to be closed after receiving a closing instruction of the controllable switch, so that the PSU supplies power to the switch power supply to be tested through the mainboard.
5. The dynamic response test device of switching power supply according to claim 4, wherein said controllable switch is a relay.
6. The switching power supply testing apparatus according to claim 4, wherein the user instruction includes an input voltage value of the switching power supply under test;
controlling the direct current power supply to supply power to the switch power supply to be tested, comprising:
and controlling the direct current power supply to output the input voltage value so as to supply power to the switch power supply to be tested.
7. The device for testing the dynamic response of the switching power supply according to claim 1, wherein the collecting module is further configured to test a load current value of the load module and display a waveform of an output voltage value of the switching power supply to be tested varying with the load current value of the load module.
8. The dynamic response testing apparatus of a switching power supply according to claim 1, further comprising a display module;
the control module is also used for controlling the display module to display the judgment result whether the dynamic response of the tested switching power supply meets the requirement.
9. The switching power supply dynamic response test device of claim 1, wherein the user command further comprises a design output voltage value of the switching power supply under test;
the preset output voltage range is from the designed output voltage value of the tested switching power supply to 0.97 to 1.03.
10. The dynamic response test apparatus of a switching power supply according to any one of claims 1 to 9, wherein the user command includes a full output current value;
determining the threshold value of the load current based on a user instruction, comprising:
when the full-load output current value is smaller than a standard current threshold value, determining that a large current threshold value of the load current is 90% of the full-load output current value, and a small current threshold value is 10% of the full-load output current value;
when the full-load output current value is not less than a standard current threshold value, determining that a first large-current threshold value of the load current is 50% of the full-load output current value, and a first small-current threshold value is 0% of the full-load output current value; the second large current threshold is 100% of the full-load output current value, and the second small current threshold is 50% of the full-load output current value.
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| CN116312308A (en) * | 2023-04-27 | 2023-06-23 | 海的电子科技(苏州)有限公司 | Output voltage calibration method and device for shortening Bar and storage medium |
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| CN113702858B (en) | 2024-03-15 |
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