A power module testing system

Abstract

This invention provides a power module testing system, comprising: a terminal device, a controller, and a load switching module; the terminal device is connected to the controller, the controller is connected to the load switching module, and the load switching module is connected to the output terminal of the power module under test; the terminal device is used to send a communication protocol to the controller; wherein, the communication protocol includes the load resistance test range of the power module under test; the controller is used to send a load switching signal to the load switching module according to the load resistance test range, and to collect the current of the load switching module when switched to different load resistances; the load switching module is used to switch different load resistances connected to the output terminal of the power module under test based on the load switching signal. This invention realizes automated testing of the output current of the power module under different loads, the testing system has a simple structure and is easy to implement, saves testing costs, shortens the testing cycle, and improves testing efficiency.

Description

[0001] This application is based on and claims priority to patent application No. 202410059171.5, filed on January 15, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of power module testing technology, and in particular to a power module testing system. Background Technology

[0003] Power module test circuits are primarily used to test and verify whether a selected power module meets its functional requirements. During testing, these circuits typically require load adjustment to verify the power module's current limiting and output under load. However, existing power module test circuits usually rely on dedicated testing equipment and necessitate manual load adjustment, increasing testing costs, extending the testing cycle, and consequently reducing testing efficiency. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a power module testing system that realizes automated testing of the output current of the power module under different loads. This allows the system to determine whether the current limiting point design of the power module is reasonable based on the test results. The testing system has a simple structure and is easy to implement, saving testing costs, shortening the testing cycle, and improving testing efficiency.

[0005] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0006] In a first aspect, this utility model provides a power module testing system, including: a terminal device, a controller, and a load switching module;

[0007] The terminal device is connected to the controller, the controller is connected to the load switching module, and the load switching module is connected to the output terminal of the power supply module under test.

[0008] The terminal device is used to send a communication protocol to the controller; wherein, the communication protocol includes the load resistance test range of the power module under test;

[0009] The controller is used to send a load switching signal to the load switching module according to the load resistance test range, and to collect the current when the load switching module switches to different load resistances;

[0010] The load switching module is used to switch different load resistors connected to the output terminal of the power supply module under test based on the load switching signal.

[0011] Furthermore, this utility model embodiment provides a first possible implementation of the first aspect, wherein the load switching module includes a plurality of switching devices and a plurality of load resistors with different resistance values, the number of the switching devices being the same as the number of the load resistors;

[0012] Each of the aforementioned switching devices is connected between the output terminal of the power supply module under test and the corresponding load resistor.

[0013] Furthermore, this utility model embodiment provides a second possible implementation of the first aspect, wherein the controller includes a plurality of control ports, the number of which is the same as the number of switching devices;

[0014] Each of the aforementioned control ports is connected to a corresponding control terminal of each of the aforementioned switching devices;

[0015] The controller is used to send on / off signals to the switching device through the control port to control the output terminal of the power module under test to be connected to the corresponding load resistor.

[0016] Furthermore, this utility model embodiment provides a third possible implementation of the first aspect, wherein the controller further includes a plurality of signal acquisition ports, the number of which is the same as the number of the switching devices or the load resistors;

[0017] Each of the signal acquisition ports is sequentially connected between each of the switching devices and the corresponding load resistor;

[0018] The controller is used to acquire the voltage value corresponding to the load resistor through the signal acquisition port, and calculate the current flowing through the load resistor based on the voltage value and the resistance value of the load resistor.

[0019] Furthermore, this utility model embodiment provides a fourth possible implementation of the first aspect, wherein the controller is further configured to sort the load resistors to be tested in ascending order of resistance value, select the first load resistor from the sorted results as the target load resistor, control the target switching device connected to the target load resistor to be turned on, control other switching devices except the target switching device to be turned off, after the target switching device is turned on for a first preset time, acquire the target voltage corresponding to the target load resistor, calculate the target current flowing through the target load resistor based on the target voltage and the target load resistor, after the target current calculation is completed for a second preset time, take the next load resistor in the sorted results as the new target load resistor, control the target switching device connected to the new target load resistor to be turned on, so as to calculate the target current flowing through the new target load resistor, until the test of each load resistor in the sorted results is completed.

[0020] Furthermore, this utility model embodiment provides a fifth possible implementation of the first aspect, wherein the controller is further configured to send the target voltage, the target load resistance and the target current to the terminal device after the target current of the target load resistance is calculated;

[0021] or,

[0022] The controller is also used to send each load resistor and its corresponding voltage and current values ​​to the terminal device after all load resistors in the sorting results have been tested.

[0023] Furthermore, this utility model embodiment provides a sixth possible implementation of the first aspect, wherein the load resistance to be tested includes all or part of the load resistance in the load switching module;

[0024] The values ​​of the first preset duration and the second preset duration are both within the range of 100ms to 1s.

[0025] Furthermore, this utility model embodiment provides a seventh possible implementation of the first aspect, wherein the switching device includes a transistor;

[0026] The collector of the transistor is connected to the output terminal of the power supply module under test, the emitter of the transistor is connected to the load resistor, and the base of the transistor is connected to the corresponding control port.

[0027] Furthermore, this utility model embodiment provides an eighth possible implementation of the first aspect, wherein the power module test system includes a plurality of base resistors, the number of which is the same as the number of transistors;

[0028] The base resistor is connected between the base of the transistor and the control port of the controller.

[0029] Furthermore, this utility model embodiment provides a ninth possible implementation of the first aspect, wherein both the terminal device and the controller are equipped with a Bluetooth module, and the terminal device and the controller communicate through the Bluetooth module.

[0030] Secondly, this utility model embodiment also provides a power module testing method, applied to the controller of the power module testing system according to any one of the first aspects, the power module testing method comprising:

[0031] The device receives a communication protocol sent by the terminal device; wherein the communication protocol includes the load resistance test range of the power module under test.

[0032] According to the load resistance test range, a load switching signal is sent to the load switching module, so that the load switching module switches different load resistors to the output terminal of the power supply module under test based on the load switching signal.

[0033] The current is collected when the load switching module switches to different load resistors.

[0034] This invention provides a power module testing system, comprising: a terminal device, a controller, and a load switching module; the terminal device is connected to the controller, the controller is connected to the load switching module, and the load switching module is connected to the output terminal of the power module under test; the terminal device sends a communication protocol to the controller; wherein, the communication protocol includes the load resistance test range of the power module under test; the controller sends a load switching signal to the load switching module according to the load resistance test range, and collects the current of the load switching module when switched to different load resistances; the load switching module switches different load resistances connected to the output terminal of the power module under test based on the load switching signal. This invention achieves automated testing of the output current of the power module under different loads by automatically switching the load resistance value connected to the power module based on the load switching module, and by collecting the current output of the power module under different load resistances based on the controller. This allows for the determination of whether the current limiting point design of the power module is reasonable based on the test results. The testing system has a simple structure, is easy to implement, saves testing costs, shortens the testing cycle, and improves testing efficiency.

[0035] Other features and advantages of the embodiments of this utility model will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described techniques of the embodiments of this utility model.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This diagram illustrates a power module testing system structure provided by an embodiment of the present invention.

[0039] Figure 2 This diagram illustrates another power module testing system structure provided by an embodiment of the present invention.

[0040] Figure 3 This diagram illustrates a circuit connection schematic of a power module testing system provided in an embodiment of the present invention.

[0041] Figure 4 A flowchart of a power module testing method provided by an embodiment of the present invention is shown;

[0042] Figure 5 A schematic diagram of another power module testing system structure provided by this utility model embodiment is shown;

[0043] Figure 6 This diagram illustrates another power module testing system structure provided by an embodiment of the present invention.

[0044] Figure 7 This diagram illustrates another power module test system circuit connection diagram provided by an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0046] Currently, verifying whether a selected power module meets relevant functional requirements requires manually adjusting the load to verify the current limiting and current output of the power module under load. This not only relies on dedicated testing equipment but also requires manual load adjustment, resulting in high testing costs, long testing cycles, and consequently low efficiency.

[0047] To address the aforementioned problems, this utility model provides a power module testing system, which will be described in detail below.

[0048] Example 1

[0049] This embodiment provides a power module testing system, see [link / reference] Figure 1 The diagram shows the structure of a power module testing system, which includes: a terminal device 11, a controller 12, and a load switching module 13.

[0050] Terminal device 11 is connected to controller 12, controller 12 is connected to load switching module 13, and load switching module 13 is connected to the output terminal of power module 14 under test.

[0051] Terminal device 11 is used to send a communication protocol to controller 12; wherein, the communication protocol includes the load resistance test range of the power module 14 under test;

[0052] The controller 12 is used to send a load switching signal to the load switching module 13 according to the load resistance test range, and to collect the current of the load switching module 13 when it switches to different load resistances;

[0053] The controller 12 is also used to send the resistance value of the load resistor and the current collected under different load resistors to the terminal device;

[0054] The load switching module 13 is used to switch different load resistors connected to the output terminal of the power supply module 14 under test based on the load switching signal.

[0055] The aforementioned terminal device 11 can be an electronic device such as a mobile terminal or a computer. Terminal device 11 receives communication protocol content set by the user and sends the user-set communication protocol content to controller 12. For example, if the user sets the load resistance test range to r0-r1, then terminal device 11 will send a communication protocol including the load resistance test range of r0-r1 to controller 12. By setting the load resistance test range, the size of the load resistance connected to the power supply module 14 under test can be automatically adjusted, thus making it suitable for testing the output current of different power supply modules.

[0056] The load switching module 13 described above may be equipped with multiple switching circuits or switching devices that can control the on / off state of different loads and the power supply module 14 under test. By controlling the on / off state of the switching circuits, different load resistors can be connected to the output terminal of the power supply module 14 under test, thereby realizing the switching of load resistors.

[0057] The load switching module 13 can switch different load resistors to the output terminal of the test power module 14. The controller 12 controls the resistance value of the load resistor switched by the load switching module 13 according to the load resistance test range of r0-r1, so that the resistance value of the load resistor switched by the load switching module 13 is within the load resistance test range of r0-r1.

[0058] The controller 12 is connected to the current sampling point in the load switching module 13. Each time the load switching module 13 switches, it connects to the load resistor at the output terminal of the power module 14 under test. The controller 12 collects the current flowing through the load resistor once. After the power module test is completed, the output current of the power module under different load resistors can be obtained. This allows the user to judge whether the current limiting point design of the power module is reasonable based on the output current of the power module under different load resistors, thus realizing the automated completion of the current output test of the power module.

[0059] The power module testing system provided in this embodiment automatically switches the load resistance value connected to the power module based on the load switching module, and collects the current output of the power module under different load resistances based on the controller. This realizes the automated testing of the output current of the power module under different loads. Thus, the current limiting point design of the power module can be judged based on the test results. The test system has a simple structure and is easy to implement, saving test costs, shortening the test cycle, and improving test efficiency.

[0060] In one embodiment, see as follows Figure 2 The diagram shows another power module test system structure. The load switching module 13 provided in this embodiment includes multiple switching devices K1 to Kn and multiple load resistors R11 to Rnn with different resistance values. The number of switching devices n is the same as the number of load resistors n.

[0061] Each switching device K1 to Kn is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistors R11 to Rnn.

[0062] like Figure 2 As shown, switching device K1 is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor R11; switching device K2 is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor R22; and so on, with switching device Kn connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor Rnn. The aforementioned switching devices K1 to Kn can be electronic switching components such as transistors, power switches, or control switches.

[0063] In one embodiment, such as Figure 2 As shown, the controller provided in this embodiment includes multiple control ports GPIO1 to GPIOn, and the number of control ports n is the same as the number of switching devices n; each control port GPIO1 to GPIOn is connected to the control terminal of each switching device K1 to Kn in a one-to-one correspondence; the controller 12 is used to send on / off signals to the switching devices through the control ports GPIO1 to GPIOn to control the output terminal of the power module 14 under test to be connected to the corresponding load resistor.

[0064] The controller 12 controls the on / off states of various switching devices K1 to Kn, enabling different load resistors to be connected to the output terminal VOUT of the power supply module 14 under test, thereby achieving automatic switching of the load resistor. For example, when it is necessary to test the current output of the power supply module 14 under load resistor R22, the controller 12 controls the switching device K2 to be turned on and controls the switching devices K1 and K3 to Kn to be turned off, thereby switching the load resistor R22 to the output terminal VOUT of the power supply module 14 under test.

[0065] In one embodiment, such as Figure 2 As shown, the controller 12 provided in this embodiment also includes multiple signal acquisition ports ADC1 to ADCn, and the number of signal acquisition ports n is the same as the number of switching devices or load resistors n;

[0066] like Figure 2 As shown, each signal acquisition port ADC1 to ADCn is connected sequentially between each switching device K1 to Kn and its corresponding load resistor; signal acquisition port ADC1 is connected between switching device K1 and its corresponding load resistor R11, signal acquisition port ADC2 is connected between switching device K2 and its corresponding load resistor R22, and so on, signal acquisition port ADCn is connected between switching device Kn and its corresponding load resistor Rnn.

[0067] The controller 12 is used to acquire the voltage value corresponding to the load resistor through the signal acquisition ports ADC1 to ADCn, and calculate the current flowing through the load resistor based on the voltage value and the resistance value of the load resistor. For example, when the controller 12 controls the load resistor R22 to be connected to the output terminal VOUT of the power module under test 14, the controller 12 acquires the voltage V2 corresponding to the load resistor R22 based on the signal acquisition port ADC2, and calculates the current I2 flowing through the load resistor R22 based on the voltage V2 and the resistance value of the load resistor R22, where I2 = V2 / R22.

[0068] In one embodiment, the controller provided in this embodiment is further configured to sort the load resistors to be tested in ascending order of resistance value, select the first load resistor from the sorted results as the target load resistor, control the target switching device connected to the target load resistor to turn on, and control other switching devices except the target switching device to turn off. After the target switching device turns on for a first preset time, the target voltage corresponding to the target load resistor is collected, and the target current flowing through the target load resistor is calculated based on the target voltage and the target load resistor. After the target current calculation is completed for a second preset time, the next load resistor in the sorted results is selected as the new target load resistor, and the target switching device connected to the new target load resistor is controlled to turn on to calculate the target current flowing through the new target load resistor, until the test of each load resistor in the sorted results is completed.

[0069] For example, when the load resistance test range r0-r1 includes load resistances from R11 to R88, the load resistances are sorted in ascending order of resistance value, resulting in R11 to R88. The test starts with the smallest load resistance, R11, and load resistance R11 is used as the target load resistance. The target switching device K1 connected to the target load resistance R11 is controlled to be turned on, while other switching devices K2 to Kn are controlled to be turned off.

[0070] After a first preset time interval Δt1, the controller 12 acquires the target voltage V1 across the target load resistor R11 through the signal acquisition port ADC1. Based on the ratio of the target voltage V1 to the target load resistor R11, the controller 12 calculates the target current I1 flowing through the target load resistor R11. By acquiring the target current flowing through the target load resistor after the switching device has been turned on for a period of time, the controller 12 can acquire the current after the current output by the power supply module 14 under test has stabilized, thereby improving the accuracy of sampling the output current of the power supply module under the load resistor.

[0071] After a second preset time interval Δt2, the next load resistor R22 is used as the new target load resistor. The target switching device K2 connected to the new target load resistor R22 is turned on, and other switching devices are turned off, so as to switch the target load resistor R22 to the output terminal of the power module 14 under test. After a first preset time interval Δt1, the controller 12 acquires the target voltage V2 across the target load resistor R22 through the signal acquisition port ADC2. Based on the ratio of the target voltage V2 to the target load resistor R22, the target current I2 flowing through the target load resistor R22 is calculated. This process continues until the target voltage V8 and the corresponding target current I8 across the target load resistor R88 are acquired, and the power module test ends.

[0072] In one embodiment, the controller provided in this embodiment is further configured to send the target voltage, target load resistance and target current to the terminal device after the target current of the target load resistance is calculated;

[0073] For example, when the load resistances included in the above load resistance test range r0-r1 are R11 to R88, after the target current I1 of the load resistance R11 is calculated, the target voltage V1, the target load resistance R11, and the target current I1 are packaged and sent to the terminal device. After the target current I2 of the load resistance R22 is calculated, the target voltage V2, the target load resistance R22, and the target current I2 are packaged and sent to the terminal device. Similarly, after the target current I8 of the load resistance R88 is calculated, the target voltage V8, the target load resistance R88, and the target current I8 are packaged and sent to the terminal device.

[0074] In another embodiment, the controller provided in this embodiment is also used to send each load resistor and its corresponding voltage and current values ​​to the terminal device after all load resistance tests in the sorting results are completed.

[0075] For example, when the load resistance test range r0-r1 includes load resistances from R11 to R88, after all load resistances R11 to R88 have been tested, the voltage and current corresponding to each load resistance R11 to R88 are packaged and sent to the terminal device. This allows the terminal device to record and save the resistance values ​​of the load resistances R11 to R88 and the corresponding voltage and current information sent by the controller. Based on this information, the user can determine the output current and current limiting point of the power module under different load resistances.

[0076] In one embodiment, the load resistance to be tested in this embodiment includes all or part of the load resistance in the load switching module; when the load switching module includes load resistances R11 to Rnn, the load resistance to be tested in the load resistance test range can be R11 to Rnn, or any multiple load resistances among R11 to Rnn, such as R55 to R99.

[0077] The values ​​of the first and second preset durations are both in the range of 100ms to 1s, with 100ms being the preferred value.

[0078] In one embodiment, the switching device provided in this embodiment includes a transistor; the collector of the transistor is connected to the output terminal of the power supply module under test, the emitter of the transistor is connected to the load resistor, and the base of the transistor is connected to the corresponding control port.

[0079] See also Figure 3 The circuit connection diagram of the power module test system shown in this embodiment includes transistors Q1 to Qn as switching devices. The collector of transistor Q1 is connected to the output terminal of the power module under test 14, the emitter of transistor Q1 is connected to the load resistor R11, and the base of transistor Q1 is connected to the corresponding control port GPIO1. The collector of transistor Q2 is connected to the output terminal of the power module under test 14, the emitter of transistor Q2 is connected to the load resistor R22, and the base of transistor Q2 is connected to the corresponding control port GPIO2. Similarly, the collector of transistor Qn is connected to the output terminal of the power module under test 14, the emitter of transistor Qn is connected to the load resistor Rnn, and the base of transistor Qn is connected to the corresponding control port GPIOn.

[0080] In one embodiment, such as Figure 3 As shown, the power module testing system provided in this embodiment includes multiple base resistors R1 to Rn, the number of base resistors n is the same as the number of transistors n; the base resistors are connected between the base of the transistors and the control port of the controller.

[0081] like Figure 3As shown, base resistor R1 is connected between the base of transistor Q1 and the control port GPIO1 of controller 12, base resistor R2 is connected between the base of transistor Q2 and the control port GPIO2 of controller 12, and so on, with base resistor Rn connected between the base of transistor Qn and the control port GPIOn of controller 12. By connecting base resistors to the base of the transistors, the transistors can be brought into saturation when the power module outputs current, so that the emitter voltage is approximately equal to the collector voltage, i.e., Vc≈Ve. R11~Rnn are emitter resistors, mainly providing the load, thereby testing the output current and current limiting point of the power module under different resistance values.

[0082] The power module testing system provided in this embodiment can not only quickly and automatically test the accurate current output of different power modules under different loads, but also determine whether the current limiting point design of the power module is reasonable based on the detected voltage and current under different load resistors, ensuring that the power module can meet the requirements in terms of output current and can be properly protected in case of fault. The system has a simple structure, is easy to implement, and can save testing costs and shorten the testing cycle, thereby effectively improving testing efficiency.

[0083] Example 2

[0084] This embodiment provides a power module testing system, see [link / reference] Figures 5-7 The diagram shows the structure of a power module testing system, which includes: a terminal device 11, a controller 12, and a load switching module 13.

[0085] Terminal device 11 is connected to controller 12, controller 12 is connected to load switching module 13, and load switching module 13 is connected to the output terminal of power module 14 under test.

[0086] Terminal device 11 is used to send a communication protocol to controller 12; wherein, the communication protocol includes the load resistance test range of the power module 14 under test;

[0087] The controller 12 is used to send a load switching signal to the load switching module 13 according to the load resistance test range, and to collect the current of the load switching module 13 when it switches to different load resistances;

[0088] The controller 12 is also used to send the resistance value of the load resistor and the current collected under different load resistors to the terminal device;

[0089] The load switching module 13 is used to switch different load resistors connected to the output terminal of the power supply module 14 under test based on the load switching signal.

[0090] The aforementioned terminal device 11 can be an electronic device such as a mobile terminal or a computer. Terminal device 11 receives communication protocol content set by the user and sends the user-set communication protocol content to controller 12. For example, if the user sets the load resistance test range to r0-r1, then terminal device 11 will send a communication protocol including the load resistance test range of r0-r1 to controller 12. By setting the load resistance test range, the size of the load resistance connected to the power supply module 14 under test can be automatically adjusted, thus making it suitable for testing the output current of different power supply modules.

[0091] The load switching module 13 described above may be equipped with multiple switching circuits or switching devices that can control the on / off state of different loads and the power supply module 14 under test. By controlling the on / off state of the switching circuits, different load resistors can be connected to the output terminal of the power supply module 14 under test, thereby realizing the switching of load resistors.

[0092] The load switching module 13 can switch different load resistors to the output terminal of the test power module 14. The controller 12 controls the resistance value of the load resistor switched by the load switching module 13 according to the load resistance test range of r0-r1, so that the resistance value of the load resistor switched by the load switching module 13 is within the load resistance test range of r0-r1.

[0093] The controller 12 is connected to the current sampling point in the load switching module 13. Each time the load switching module 13 switches, it connects to the load resistor at the output terminal of the power module 14 under test. The controller 12 collects the current flowing through the load resistor once. After the power module test is completed, the output current of the power module under different load resistors can be obtained. This allows the user to judge whether the current limiting point design of the power module is reasonable based on the output current of the power module under different load resistors, thus realizing the automated completion of the current output test of the power module.

[0094] The power module testing system provided in this embodiment automatically switches the load resistance value connected to the power module based on the load switching module, and collects the current output of the power module under different load resistances based on the controller. This realizes the automated testing of the output current of the power module under different loads. Thus, the current limiting point design of the power module can be judged based on the test results. The test system has a simple structure and is easy to implement, saving test costs, shortening the test cycle, and improving test efficiency.

[0095] In one embodiment, see as follows Figure 6 The diagram shows another power module test system structure. The load switching module 13 provided in this embodiment includes multiple switching devices K1 to Kn and multiple load resistors R11 to Rnn with different resistance values. The number of switching devices n is the same as the number of load resistors n.

[0096] Each switching device K1 to Kn is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistors R11 to Rnn.

[0097] like Figure 6 As shown, switching device K1 is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor R11; switching device K2 is connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor R22; and so on, with switching device Kn connected between the output terminal VOUT of the power supply module 14 under test and the corresponding load resistor Rnn. The aforementioned switching devices K1 to Kn can be electronic switching components such as transistors, power switches, or control switches.

[0098] In one embodiment, such as Figure 6 As shown, the controller provided in this embodiment includes multiple control ports GPIO1 to GPIOn, and the number of control ports n is the same as the number of switching devices n; each control port GPIO1 to GPIOn is connected to the control terminal of each switching device K1 to Kn in a one-to-one correspondence; the controller 12 is used to send on / off signals to the switching devices through the control ports GPIO1 to GPIOn to control the output terminal of the power module 14 under test to be connected to the corresponding load resistor.

[0099] The controller 12 controls the on / off states of various switching devices K1 to Kn, enabling different load resistors to be connected to the output terminal VOUT of the power supply module 14 under test, thereby achieving automatic switching of the load resistor. For example, when it is necessary to test the current output of the power supply module 14 under load resistor R22, the controller 12 controls the switching device K2 to be turned on and controls the switching devices K1 and K3 to Kn to be turned off, thereby switching the load resistor R22 to the output terminal VOUT of the power supply module 14 under test.

[0100] In one embodiment, such as Figure 6 As shown, the controller 12 provided in this embodiment also includes multiple signal acquisition ports ADC1 to ADCn, and the number of signal acquisition ports n is the same as the number of switching devices or load resistors n;

[0101] like Figure 6 As shown, each signal acquisition port ADC1 to ADCn is connected sequentially between each switching device K1 to Kn and its corresponding load resistor; signal acquisition port ADC1 is connected between switching device K1 and its corresponding load resistor R11, signal acquisition port ADC2 is connected between switching device K2 and its corresponding load resistor R22, and so on, signal acquisition port ADCn is connected between switching device Kn and its corresponding load resistor Rnn.

[0102] The controller 12 is used to acquire the voltage value corresponding to the load resistor through the signal acquisition ports ADC1 to ADCn, and calculate the current flowing through the load resistor based on the voltage value and the resistance value of the load resistor. For example, when the controller 12 controls the load resistor R22 to be connected to the output terminal VOUT of the power module under test 14, the controller 12 acquires the voltage V2 corresponding to the load resistor R22 based on the signal acquisition port ADC2, and calculates the current I2 flowing through the load resistor R22 based on the voltage V2 and the resistance value of the load resistor R22, where I2 = V2 / R22.

[0103] In one embodiment, the controller provided in this embodiment is further configured to sort the load resistors to be tested in ascending order of resistance value, select the first load resistor from the sorted results as the target load resistor, control the target switching device connected to the target load resistor to turn on, and control other switching devices except the target switching device to turn off. After the target switching device turns on for a first preset time, the target voltage corresponding to the target load resistor is collected, and the target current flowing through the target load resistor is calculated based on the target voltage and the target load resistor. After the target current calculation is completed for a second preset time, the next load resistor in the sorted results is selected as the new target load resistor, and the target switching device connected to the new target load resistor is controlled to turn on to calculate the target current flowing through the new target load resistor, until the test of each load resistor in the sorted results is completed.

[0104] For example, when the load resistance test range r0-r1 includes load resistances from R11 to R88, the load resistances are sorted in ascending order of resistance value, resulting in R11 to R88. The test starts with the smallest load resistance, R11, and load resistance R11 is used as the target load resistance. The target switching device K1 connected to the target load resistance R11 is controlled to be turned on, while other switching devices K2 to Kn are controlled to be turned off.

[0105] After a first preset time interval Δt1, the controller 12 acquires the target voltage V1 across the target load resistor R11 through the signal acquisition port ADC1. Based on the ratio of the target voltage V1 to the target load resistor R11, the controller 12 calculates the target current I1 flowing through the target load resistor R11. By acquiring the target current flowing through the target load resistor after the switching device has been turned on for a period of time, the controller 12 can acquire the current after the current output by the power supply module 14 under test has stabilized, thereby improving the accuracy of sampling the output current of the power supply module under the load resistor.

[0106] After a second preset time interval Δt2, the next load resistor R22 is used as the new target load resistor. The target switching device K2 connected to the new target load resistor R22 is turned on, and other switching devices are turned off, so as to switch the target load resistor R22 to the output terminal of the power module 14 under test. After a first preset time interval Δt1, the controller 12 acquires the target voltage V2 across the target load resistor R22 through the signal acquisition port ADC2. Based on the ratio of the target voltage V2 to the target load resistor R22, the target current I2 flowing through the target load resistor R22 is calculated. This process continues until the target voltage V8 and the corresponding target current I8 across the target load resistor R88 are acquired, and the power module test ends.

[0107] In one embodiment, the controller provided in this embodiment is further configured to send the target voltage, target load resistance and target current to the terminal device after the target current of the target load resistance is calculated;

[0108] For example, when the load resistances included in the above load resistance test range r0-r1 are R11 to R88, after the target current I1 of the load resistance R11 is calculated, the target voltage V1, the target load resistance R11, and the target current I1 are packaged and sent to the terminal device. After the target current I2 of the load resistance R22 is calculated, the target voltage V2, the target load resistance R22, and the target current I2 are packaged and sent to the terminal device. Similarly, after the target current I8 of the load resistance R88 is calculated, the target voltage V8, the target load resistance R88, and the target current I8 are packaged and sent to the terminal device.

[0109] In another embodiment, the controller provided in this embodiment is also used to send each load resistor and its corresponding voltage and current values ​​to the terminal device after all load resistance tests in the sorting results are completed.

[0110] For example, when the load resistance test range r0-r1 includes load resistances from R11 to R88, after all load resistances R11 to R88 have been tested, the voltage and current corresponding to each load resistance R11 to R88 are packaged and sent to the terminal device. This allows the terminal device to record and save the resistance values ​​of the load resistances R11 to R88 and the corresponding voltage and current information sent by the controller. Based on this information, the user can determine the output current and current limiting point of the power module under different load resistances.

[0111] In one embodiment, the load resistance to be tested in this embodiment includes all or part of the load resistance in the load switching module; when the load switching module includes load resistances R11 to Rnn, the load resistance to be tested in the load resistance test range can be R11 to Rnn, or any multiple load resistances among R11 to Rnn, such as R55 to R99.

[0112] The values ​​of the first and second preset durations are both in the range of 100ms to 1s, with 100ms being the preferred value.

[0113] In one embodiment, the switching device provided in this embodiment includes a transistor; the collector of the transistor is connected to the output terminal of the power supply module under test, the emitter of the transistor is connected to the load resistor, and the base of the transistor is connected to the corresponding control port.

[0114] See also Figure 7 The circuit connection diagram of the power module test system shown in this embodiment includes transistors Q1 to Qn as switching devices. The collector of transistor Q1 is connected to the output terminal of the power module under test 14, the emitter of transistor Q1 is connected to the load resistor R11, and the base of transistor Q1 is connected to the corresponding control port GPIO1. The collector of transistor Q2 is connected to the output terminal of the power module under test 14, the emitter of transistor Q2 is connected to the load resistor R22, and the base of transistor Q2 is connected to the corresponding control port GPIO2. Similarly, the collector of transistor Qn is connected to the output terminal of the power module under test 14, the emitter of transistor Qn is connected to the load resistor Rnn, and the base of transistor Qn is connected to the corresponding control port GPIOn.

[0115] In one embodiment, such as Figure 7 As shown, the power module testing system provided in this embodiment includes multiple base resistors R1 to Rn, the number of base resistors n is the same as the number of transistors n; the base resistors are connected between the base of the transistors and the control port of the controller.

[0116] like Figure 7As shown, base resistor R1 is connected between the base of transistor Q1 and the control port GPIO1 of controller 12, base resistor R2 is connected between the base of transistor Q2 and the control port GPIO2 of controller 12, and so on, with base resistor Rn connected between the base of transistor Qn and the control port GPIOn of controller 12. By connecting base resistors to the base of the transistors, the transistors can be brought into saturation when the power module outputs current, so that the emitter voltage is approximately equal to the collector voltage, i.e., Vc≈Ve. R11~Rnn are emitter resistors, mainly providing the load, thereby testing the output current and current limiting point of the power module under different resistance values.

[0117] In one embodiment, such as Figures 5-7 As shown, both the terminal device 11 and the controller 12 are equipped with Bluetooth modules. In practical applications, the terminal device 11 and the controller 12 communicate through the Bluetooth module. For example, the terminal device 11 sends a communication protocol to the controller 12 through the Bluetooth module, and the controller 12 sends the resistance value of the load resistor and the current collected under different load resistors to the terminal device 11 through the Bluetooth module. Thus, the Bluetooth module enables rapid and automated testing of the output current of the power module under different loads, improving testing efficiency.

[0118] The power module testing system provided in this embodiment can not only quickly and automatically test the accurate current output of different power modules under different loads, but also determine whether the current limiting point design of the power module is reasonable based on the detected voltage and current under different load resistors, ensuring that the power module can meet the requirements in terms of output current and can be properly protected in case of fault. The system has a simple structure, is easy to implement, and can save testing costs and shorten the testing cycle, thereby effectively improving testing efficiency.

[0119] Example 3

[0120] Corresponding to the power module testing system provided in the above embodiments, this embodiment provides a power module testing method, applied to the controller of the power module testing system provided in Embodiments 1 and 2 above. See [link to documentation]. Figure 4 The flowchart shown below illustrates the power module testing method, which mainly includes the following steps:

[0121] Step S402: Receive the communication protocol sent by the terminal device;

[0122] The communication protocol includes the load resistance test range of the power module under test;

[0123] Step S404: Send a load switching signal to the load switching module according to the load resistance test range, so that the load switching module switches different load resistors to the output terminal of the power supply module under test based on the load switching signal.

[0124] Step S406: Collect the current when the load switching module switches to different load resistors.

[0125] The controller sends the resistance value of the load resistor and the current collected under different load resistors to the terminal device.

[0126] The power module testing method provided in this embodiment automatically switches the load resistance value connected to the power module based on the load switching module, and collects the current output of the power module under different load resistances based on the controller. This realizes the automated testing of the output current of the power module under different loads. Thus, the current limiting point design of the power module can be judged based on the test results. The test system has a simple structure and is easy to implement, saving test costs, shortening the test cycle, and improving test efficiency.

[0127] In one embodiment, the controller includes multiple control ports and multiple signal acquisition ports, wherein the number of control ports is the same as the number of switching devices; the number of signal acquisition ports is the same as the number of switching devices or load resistors; the method provided in this embodiment further includes:

[0128] The control port sends on / off signals to the switching device to control the connection between the output terminal of the power module under test and the corresponding load resistor.

[0129] The voltage value corresponding to the load resistor is acquired through the signal acquisition port, and the current flowing through the load resistor is calculated based on the voltage value and the resistance value of the load resistor.

[0130] The load resistors to be tested are sorted in ascending order of resistance value. The first load resistor in the sorted result is selected as the target load resistor. The target switch connected to the target load resistor is turned on, and all other switches are turned off. After the target switch is turned on for a first preset time, the target voltage corresponding to the target load resistor is collected. The target current flowing through the target load resistor is calculated based on the target voltage and the target load resistor. After the target current calculation is completed for a second preset time, the next load resistor in the sorted result is selected as the new target load resistor. The target switch connected to the new target load resistor is turned on to calculate the target current flowing through the new target load resistor. This process continues until all load resistors in the sorted result have been tested.

[0131] After the target current of the target load resistance is calculated, the target voltage, target load resistance and target current are sent to the terminal device; or, the controller is also used to send each load resistance and its corresponding voltage and current values ​​to the terminal device after all load resistance tests in the sorting results are completed.

[0132] The method provided in this embodiment has the same implementation principle and technical effect as the aforementioned embodiments. For the sake of brevity, any parts not mentioned in the method embodiment can be referred to the corresponding content in the aforementioned system embodiment.

[0133] This utility model embodiment provides an electronic device, which includes a processor and a memory. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the method provided in the above embodiment.

[0134] This utility model provides a computer-readable medium storing computer-executable instructions. When the computer-executable instructions are invoked and executed by a processor, the computer-executable instructions cause the processor to implement the method described in the above embodiments.

[0135] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0136] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0137] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0138] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0139] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A power module test system, characterized by, include: Terminal equipment, controllers, and load switching modules; The terminal device is connected to the controller, the controller is connected to the load switching module, and the load switching module is connected to the output terminal of the power supply module under test. The terminal device is used to send a communication protocol to the controller; wherein, the communication protocol includes the load resistance test range of the power module under test; The controller is used to send a load switching signal to the load switching module according to the load resistance test range, and to collect the current when the load switching module switches to different load resistances; The load switching module is used to switch different load resistors connected to the output terminal of the power supply module under test based on the load switching signal.

2. The power module testing system according to claim 1, characterized in that, The load switching module includes multiple switching devices and multiple load resistors with different resistance values, wherein the number of switching devices is the same as the number of load resistors. Each of the aforementioned switching devices is connected between the output terminal of the power supply module under test and the corresponding load resistor.

3. The power module test system of claim 2, wherein, The controller includes multiple control ports, the number of which is the same as the number of the switching devices; Each of the aforementioned control ports is connected to a corresponding control terminal of each of the aforementioned switching devices; The controller is used to send on / off signals to the switching device through the control port to control the output terminal of the power module under test to be connected to the corresponding load resistor.

4. The power module test system of claim 3, wherein, The controller also includes multiple signal acquisition ports, the number of which is the same as the number of the switching devices or the load resistors; Each of the signal acquisition ports is sequentially connected between each of the switching devices and the corresponding load resistor; The controller is used to acquire the voltage value corresponding to the load resistor through the signal acquisition port, and calculate the current flowing through the load resistor based on the voltage value and the resistance value of the load resistor.

5. The power module test system of claim 2, wherein, The controller is further configured to sort the load resistors to be tested in ascending order of resistance value, select the first load resistor from the sorted results as the target load resistor, control the target switching device connected to the target load resistor to turn on, and control other switching devices except the target switching device to turn off. After the target switching device has been turned on for a first preset time, the target voltage corresponding to the target load resistor is collected, and the target current flowing through the target load resistor is calculated based on the target voltage and the target load resistor. After the target current calculation is completed for a second preset time, the next load resistor in the sorted results is selected as the new target load resistor, and the target switching device connected to the new target load resistor is turned on to calculate the target current flowing through the new target load resistor, until all load resistors in the sorted results have been tested.

6. The power module test system of claim 5, wherein, The controller is also configured to send the target voltage, the target load resistance, and the target current to the terminal device after the target current of the target load resistance is calculated; or, The controller is also used to send each load resistor and its corresponding voltage and current values ​​to the terminal device after all load resistors in the sorting results have been tested.

7. The power module test system of claim 5, wherein, The load resistance to be tested includes all or part of the load resistance in the load switching module; The values ​​of the first preset duration and the second preset duration are both within the range of 100ms to 1s.

8. The power module test system of claim 3, wherein, The switching device includes a transistor; The collector of the transistor is connected to the output terminal of the power supply module under test, the emitter of the transistor is connected to the load resistor, and the base of the transistor is connected to the corresponding control port.

9. The power module test system of claim 8, wherein, It includes multiple base resistors, the number of which is the same as the number of transistors; The base resistor is connected between the base of the transistor and the control port of the controller.

10. The power module testing system according to any one of claims 1-9, characterized in that, Both the terminal device and the controller are equipped with a Bluetooth module, and the terminal device and the controller communicate with each other through the Bluetooth module.

Images