Testing device of voltage sampling circuit

Abstract

The utility model discloses a testing device for a voltage sampling circuit, and is applied to the technical field of testing. The testing device comprises a power supply, a battery simulator and a separator. The power supply supplies power to the voltage sampling circuit; the battery simulator simulates a battery to output multi-stage voltage, and the voltage sampling circuit is connected with the battery simulator through a sampling line to sample the multi-stage voltage; one end of the isolator is connected with a power supply line of a power supply, the other end is connected with a sampling line, and the isolator can isolate and clamp the voltage of the power supply line and the sampling line. Decoupling of a power supply line and a sampling line is achieved, the on-load requirement of the battery simulator and the unstable voltage drop on the sampling line are reduced, and the accuracy of the sampling precision of the test voltage sampling circuit is effectively improved.

Description

Technical Field

[0001] This application belongs to the field of testing technology, and in particular relates to a testing device for a voltage sampling circuit. Background Technology

[0002] With the continuous development of battery technology and energy storage system integration technology, energy storage equipment plays an important role in new energy power generation, new energy vehicles and other fields, meeting the diverse energy needs in different scenarios, thanks to its unique technological advantages.

[0003] The safety of energy storage devices hinges on the battery management system. The voltage sampling circuit is a crucial component of the battery management system, capable of accurately measuring the voltage values ​​and changes of individual cells within the battery pack, calculating the battery pack's parameters, and promptly triggering the battery management system's protection mechanisms.

[0004] Ensuring the sampling accuracy of voltage sampling circuits is extremely important. However, related technologies have revealed significant fluctuations in the sampling accuracy of voltage sampling circuits during testing. Utility Model Content

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a test device for a voltage sampling circuit. The voltage sampling circuit is powered by a power supply, and an isolator isolates and clamps the voltage of the power supply line and the sampling line, thereby decoupling the power supply line and the sampling line. This reduces the load requirements of the battery simulator and the unstable voltage drop on the sampling line, effectively improving the accuracy of the voltage sampling circuit.

[0006] In a first aspect, this application provides a testing device for a voltage sampling circuit, wherein the voltage sampling circuit is used to sample voltage, and the testing device includes:

[0007] Power supply, the power supply being used to power the voltage sampling circuit;

[0008] A battery simulator is provided to simulate the output of multiple voltage levels from a battery. A voltage sampling circuit is connected to the battery simulator via a sampling line to sample the multiple voltage levels.

[0009] An isolator, one end of which is connected to the power supply line of the power source, and the other end of which is connected to the sampling line. The isolator is used to isolate and clamp the voltage of the power supply line and the sampling line.

[0010] In some embodiments, the power supply includes a positive terminal and a negative terminal, the battery simulator includes multiple sampling output interfaces, the voltage sampling circuit includes multiple sampling interfaces, the multi-stage voltage includes a first negative terminal voltage and a first positive terminal voltage to an nth positive terminal voltage, each of the sampling output interfaces outputs one stage voltage, and the sampling output interfaces and the sampling interfaces correspond one-to-one and are connected through the sampling line;

[0011] The isolation component includes a first isolation component and a second isolation component. One end of the first isolation component is connected to the power supply line of the positive electrode, and the other end is connected to the sampling line corresponding to the nth positive electrode voltage. One end of the second isolation component is connected to the power supply line of the negative electrode, and the other end is connected to the sampling line corresponding to the first negative electrode voltage.

[0012] In some embodiments, the isolator includes an isolation circuit; and / or, the isolator includes a diode.

[0013] In some embodiments, the sampling lines include multiple sets, each set of the sampling lines is connected to one of the voltage sampling circuits, and the battery simulator is used to output the multiple sets of voltages through the multiple sets of sampling lines respectively.

[0014] In some embodiments, the testing apparatus further includes:

[0015] A test board is connected to the voltage sampling circuit to obtain test voltage information collected by the voltage sampling circuit.

[0016] In some embodiments, the testing device further includes a host computer running testing software. The test board includes multiple test boards, which are cascaded and connected to the host computer. The host computer is used to acquire test voltage information collected by the multiple test boards and output the test results of each voltage sampling circuit based on the test voltage information of each voltage sampling circuit.

[0017] In some embodiments, the test board is connected to the battery simulator, and the test board is used to obtain the original values ​​of the multi-level voltages output by the battery simulator. The host computer outputs the test results of each voltage sampling circuit based on the original values ​​of the multi-level voltages and the test results of each voltage sampling circuit.

[0018] In some embodiments, the test results include at least the sampling accuracy.

[0019] In some embodiments, the power supply may include one or more, and one or more power supplies connected in series may power the respective voltage sampling circuits.

[0020] In some embodiments, the battery includes n cells, and the multi-level voltage includes a first negative electrode voltage and a first positive electrode voltage to an nth positive electrode voltage, wherein the first negative electrode voltage is used to simulate the voltage of the negative electrode of the first cell, and the nth positive electrode voltage is used to simulate the voltage of the positive electrode of the nth cell.

[0021] The voltage sampling circuit testing device provided in this application embodiment supplies power to the voltage sampling circuit, so that the simulated battery only provides multi-level voltages that can be sampled by the voltage sampling circuit, without having to supply power to the voltage sampling circuit again. This reduces the load requirements of the simulated battery and improves the stability of the simulated battery simulating multi-level voltages. The isolator can isolate and clamp the voltage of the power supply line and the sampling line, realizing circuit decoupling between the power supply line and the sampling line, and reducing the unstable voltage drop on the sampling line caused by the power supply current. Thus, the voltage sampling circuit testing device provided in this application embodiment can accurately test the sampling accuracy of the voltage sampling circuit.

[0022] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of the test device for the voltage sampling circuit provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the related testing device for the voltage sampling circuit provided in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the voltage sampling circuit test device provided in the embodiments of this application for testing multiple voltage sampling circuits. Detailed Implementation

[0027] The embodiments of this application will be further described below with reference to the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions throughout.

[0028] Furthermore, the embodiments of this application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting this application.

[0029] Please see Figure 1 This application provides a test device 100 for a voltage sampling circuit 200.

[0030] The testing device 100 is used to test the sampling accuracy of the voltage sampling circuit 200.

[0031] The voltage sampling circuit 200 is used to acquire the voltage signal provided by the test device 100.

[0032] The voltage sampling circuit 200 includes a positive interface, a negative interface, and multiple sampling interfaces. Each sampling interface can collect one level of voltage. Each sampling interface is connected to the sampling output interface of the battery simulator 12 through the sampling line 17 to collect multiple levels of voltage.

[0033] Optionally, the voltage sampling circuit 200 can be a Battery Information Collector (BIC). The BIC is used to monitor and collect various parameter information of the battery and can obtain the battery voltage information in real time.

[0034] The test device 100 includes a power supply 11, a battery simulator 12, a first isolator 13, and a second isolator 14.

[0035] The power supply 11 includes a positive terminal and a negative terminal. The positive terminal of the power supply 11 is connected to the positive terminal interface of the voltage sampling circuit 200 through the power supply line 15, and the negative terminal of the power supply 11 is connected to the negative terminal interface of the voltage sampling circuit 200 through the power supply line 16. The power supply 11 is used to provide power to the voltage sampling circuit 200.

[0036] The battery simulator 12 has multiple voltage output interfaces, which are connected one-to-one with the multiple sampling interfaces of the voltage sampling circuit 200 via sampling lines 17. The battery simulator 12 is used to simulate the output of multiple voltage levels from a battery, and these multiple voltage levels are sampled by corresponding one-to-one with the multiple sampling interfaces of the voltage sampling circuit 200 via the multiple interfaces of the battery simulator 12.

[0037] One end of the first isolator 13 is connected to the power supply line 15, and the other end is connected to the highest section of the sampling line 17; one end of the second isolator 14 is connected to the power supply line 16, and the other end is connected to the lowest section of the sampling line 17. The first isolator 13 is used to isolate the direct connection between the power supply line 15 and the sampling line 17, and to clamp the voltage between the highest section of the power supply line 15 and the sampling line 17; the second isolator 14 is used to isolate the direct connection between the power supply line 16 and the sampling line 17, and to clamp the voltage between the lowest section of the power supply line 16 and the sampling line 17.

[0038] Please see Figure 2In conventional voltage sampling circuit test setups, the voltage sampling circuit is powered by an analog battery, connecting its power supply line to the highest and lowest points of the sampling line. The supply current of the voltage sampling circuit 200 creates a voltage drop in the loop. When the current in the power supply line fluctuates, based on the principle of electromagnetic induction, severe voltage fluctuations occur at the highest and lowest points of the sampling line. Since the current magnitude of the power supply line is much larger than that of the sampling line, significant circuit coupling occurs between the power supply line and the sampling line, severely affecting the sampling accuracy of the voltage sampling circuit and the test accuracy of the voltage sampling circuit test setup.

[0039] Circuit coupling refers to the process by which two or more circuits interact and influence each other in various ways, thereby transferring energy or signals. Circuit coupling can interfere with the normal transmission of voltage and current signals in a circuit, causing signal distortion.

[0040] By comparison, it can be seen that in the voltage sampling circuit 200 test device 100 provided in this application embodiment, the power supply 11 provides power to the voltage sampling circuit 200 through power supply lines 15 and 16. The battery simulator 12 no longer needs to supply power to the voltage sampling circuit 200, but only needs to provide multi-level voltage simulation of the battery, reducing the load requirement of the battery simulator 12 and making the multi-level voltage output of the battery simulator 12 more stable. One end of the first isolator 13 is connected to the power supply line 15, and the other end is connected to the highest section of the sampling line 17. One end of the second isolator 14 is connected to the power supply line 16, and the other end is connected to the lowest section of the sampling line 17. This can isolate the connection between the power supply line 15 and the sampling line 17, and the connection between the power supply line 16 and the sampling line 17, thereby decoupling the circuits of the power supply line 15 and the sampling line 17, and the power supply line 16 and the sampling line 17, thus effectively improving the sampling accuracy of the voltage sampling circuit 200 and the test accuracy of the voltage sampling circuit 200 test device 100.

[0041] Please continue reading. Figure 1 The test apparatus 100 of this application will be explained in detail below:

[0042] In some embodiments, power supply 11 is a device for providing electrical energy to voltage sampling circuit 200. Power supply 11 includes a positive terminal and a negative terminal. The positive terminal of power supply 11 is connected to the first isolator 13 and the positive interface of voltage sampling circuit 200 via power supply line 15, and the negative terminal of power supply 11 is connected to the second isolator 14 and the negative interface of voltage sampling circuit 200 via power supply line 16.

[0043] Optionally, the power source 11 can be one or more DC power sources, one or more battery cells, a battery module consisting of multiple battery cells connected together in series, parallel, or a combination of series and parallel connections, or a battery pack.

[0044] Since the current level of power supply lines 15 and 16 is much larger than the operating current level of voltage sampling circuit 200, a power supply 11 can still maintain a good power supply effect when supplying power to multiple voltage sampling circuits 200.

[0045] Please see Figure 3 In some embodiments, the power supply 11 in the test apparatus 100 may include one or more power supplies, and one or more power supplies 11 connected in series can power each voltage sampling circuit 200. One test apparatus 100 can power multiple voltage sampling circuits 200 simultaneously, which can improve test efficiency and reduce the cost of the test apparatus.

[0046] Please continue reading. Figure 1 The battery simulator 12 is a device for simulating the output of multiple voltage levels from a battery. The battery simulator 12 includes multiple sampling output interfaces, and the multiple voltage levels include the first negative terminal voltage and the first positive terminal voltage to the nth positive terminal voltage. Each sampling output interface outputs one voltage level, and each sampling output interface is connected to multiple sampling interfaces of the voltage sampling circuit 200 in a one-to-one correspondence through sampling lines 17.

[0047] In some embodiments, the battery simulator 12 simulates a battery outputting multiple voltage levels. The battery simulated by the battery simulator 12 includes n cells, and the multiple voltage levels include a first negative electrode voltage and a first positive electrode voltage to an nth positive electrode voltage. The first negative electrode voltage simulates the voltage of the negative electrode of the first cell, and the nth positive electrode voltage simulates the voltage of the positive electrode of the nth cell. The n cells are cascaded one after another. The first positive electrode voltage is the second negative electrode voltage, and the (n-1)th positive electrode voltage is the nth negative electrode voltage. Therefore, the multiple voltage levels include the first negative electrode voltage and the first positive electrode voltage to the nth positive electrode voltage. The lowest segment of the sampling line 17 corresponds to sampling the first negative electrode voltage, and the highest segment of the sampling line 17 corresponds to sampling the nth positive electrode voltage. From the lowest segment to the highest segment of the sampling line 17, the first positive electrode voltage, the second positive electrode voltage, and so on, are sampled in ascending order.

[0048] One end of the first isolator 13 is connected to the power supply line 15, and the other end is connected to the highest section of the sampling line 17, that is, the sampling line 17 corresponding to the nth positive voltage, isolating and clamping the power supply line 15 and the nth positive voltage of the highest section of the sampling line 17; one end of the second isolator 14 is connected to the power supply line 16, and the other end is connected to the lowest section of the sampling line 17, that is, the sampling line 17 corresponding to the first negative voltage, isolating and clamping the power supply line 16 and the first negative voltage of the lowest section of the sampling line 17.

[0049] Optionally, the first isolator 13 and the second isolator 14 may be an isolation circuit and / or a diode.

[0050] A diode is an electronic component with unidirectional conductivity, primarily composed of a PN junction. Diodes are inexpensive and their unidirectional conductivity allows them to provide isolation. When a forward voltage is applied across a diode, it conducts freely; when a reverse voltage is applied, it cuts off, allowing only a negligible reverse current to flow. When the voltage amplitude of a signal exceeds a certain range, the diode can limit the signal amplitude to a safe range, acting as a clamping mechanism.

[0051] In some embodiments, the sampling lines 17 include multiple groups, each group of sampling lines 17 is connected to each sampling output interface of a battery simulator 12 and each sampling interface of a voltage sampling circuit 200. The highest node of each group of sampling lines 17 is connected to the first isolator 13, and the lowest node of each group of sampling lines 17 is connected to the second isolator 14. Each group of sampling lines 17 is used to transmit multiple levels of voltage from the battery simulator 12 to the corresponding voltage sampling circuit 200.

[0052] In some embodiments, the testing apparatus 100 further includes a test board 19. The test board 19 is connected to the voltage sampling circuit 200 via a communication harness 18 to obtain test voltage information collected by the voltage sampling circuit 200. The test board 19 is also connected to the battery simulator 12 via a communication harness 22 to obtain the raw values ​​of the multi-level voltages provided by the battery simulator 12.

[0053] Optionally, the test board 19 may include one or more. Multiple test boards 19 can be connected to multiple voltage sampling circuits 200 via communication harnesses 18 to obtain test voltage information collected by the corresponding voltage sampling circuits 200; multiple test boards 19 can also be connected to multiple battery simulators 12 via communication harnesses 22 to obtain the raw values ​​of multi-level voltages provided by the corresponding battery simulators 12. In this way, the test device 100 can simultaneously detect the sampling accuracy of multiple voltage sampling circuits 200, improving test efficiency.

[0054] In some embodiments, the testing apparatus 100 further includes a host computer 21 that runs testing software. The host computer 21 is connected to one or more cascaded test boards 19 via a communication harness 20 to obtain test voltage information collected by the one or more cascaded test boards 19.

[0055] The test voltage information collected by the test board 19 includes test voltage information collected by one or more voltage sampling circuits 200 and the original values ​​of multi-level voltages provided by one or more corresponding battery simulators 12.

[0056] The host computer 21 can analyze and process the test voltage information collected by one or more cascaded test boards 19, and can output the test results of each voltage sampling circuit 200 respectively.

[0057] The test results are used to represent the test performance of the voltage sampling circuit 200. Optionally, the test results may include at least the test accuracy. The test accuracy is the absolute value of the difference between each test voltage information of each voltage sampling circuit 200 and each original value of the multi-level voltage. Each absolute value reflects the sampling accuracy of each voltage sampling circuit 200. Alternatively, the ratios of each absolute value to the corresponding original value of the multi-level voltage can be summed, and the average value can be used to represent the sampling accuracy of each voltage sampling circuit.

[0058] The host computer 21 is a device with data processing capabilities. Optionally, the host computer 21 can be a terminal.

[0059] The terminal may include, but is not limited to: smartphones (such as Android phones, iOS phones, etc.), tablet computers, laptops, desktop computers, portable personal computers, mobile internet devices (MIDs), etc., and the embodiments of this application do not limit this.

[0060] The solution in this application supplies power to the voltage sampling circuit 200 via power supply 11, reducing the load requirement of the battery simulator 12 and making the multi-level voltage provided by the battery simulator 12 more stable. The first isolator 13 isolates and clamps the voltage at the highest point of the power supply line 15 and the sampling line 17, and decouples the circuits of the power supply line 15 and the sampling line 17. The second isolator 14 isolates and clamps the voltage at the lowest point of the power supply line 6 and the sampling line 17, and decouples the circuits of the power supply line 16 and the sampling line 17. Therefore, the solution in this application can improve the accuracy of the sampling precision of the voltage sampling circuit 200 tested by the test device 100. Moreover, by cascading multiple power supplies 11 to provide power to multiple cascaded test boards 19 and multiple voltage sampling circuits 200, the sampling precision of multiple voltage sampling circuits 200 can be tested, improving test efficiency and significantly reducing test costs.

[0061] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Furthermore, the terms "first / second" used in this specification and drawings are merely to distinguish similar objects and do not represent a specific ordering of objects. Understandably, "first / second" may be interchanged in a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0063] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A testing device for a voltage sampling circuit, characterized in that, The voltage sampling circuit is used to sample voltage, and the testing device includes: Power supply, the power supply being used to power the voltage sampling circuit; A battery simulator is provided to simulate the output of multiple voltage levels from a battery. A voltage sampling circuit is connected to the battery simulator via a sampling line to sample the multiple voltage levels. An isolator, one end of which is connected to the power supply line of the power source, and the other end of which is connected to the sampling line. The isolator is used to isolate and clamp the voltage of the power supply line and the sampling line.

2. The testing apparatus according to claim 1, characterized in that, The power supply includes a positive terminal and a negative terminal. The battery simulator includes multiple sampling output interfaces. The voltage sampling circuit includes multiple sampling interfaces. The multi-stage voltage includes a first negative terminal voltage and a first positive terminal voltage to an nth positive terminal voltage. Each sampling output interface outputs one stage of voltage. The sampling output interface and the sampling interface correspond one-to-one and are connected through the sampling line. The isolation component includes a first isolation component and a second isolation component. One end of the first isolation component is connected to the power supply line of the positive electrode, and the other end is connected to the sampling line corresponding to the nth positive electrode voltage. One end of the second isolation component is connected to the power supply line of the negative electrode, and the other end is connected to the sampling line corresponding to the first negative electrode voltage.

3. The testing apparatus according to claim 1 or 2, characterized in that, The isolator includes an isolation circuit; and / or, the isolator includes a diode.

4. The testing apparatus according to claim 1, characterized in that, The sampling lines include multiple sets, and each set of the sampling lines is connected to a voltage sampling circuit. The battery simulator is used to output the multiple sets of voltages through the multiple sets of sampling lines respectively.

5. The testing apparatus according to claim 1 or 4, characterized in that, The testing apparatus also includes: A test board is connected to the voltage sampling circuit to obtain test voltage information collected by the voltage sampling circuit.

6. The testing apparatus according to claim 5, characterized in that, The testing device also includes a host computer running testing software. The test board includes multiple test boards, which are cascaded and connected to the host computer. The host computer is used to acquire the test voltage information collected by the multiple test boards and output the test results of each voltage sampling circuit based on the test voltage information of each voltage sampling circuit.

7. The testing apparatus according to claim 6, characterized in that, The test board is connected to the battery simulator. The test board is used to obtain the original values ​​of the multi-level voltages output by the battery simulator. The host computer outputs the test results of each voltage sampling circuit based on the original values ​​of the multi-level voltages and the test results of each voltage sampling circuit.

8. The testing apparatus according to claim 6 or 7, characterized in that, The test results include at least the sampling accuracy.

9. The testing apparatus according to claim 4, characterized in that, The power supply may include one or more, and one or more of the power supplies connected in series may power the respective voltage sampling circuits.

10. The testing apparatus according to claim 1, characterized in that, The battery includes n cells, and the multi-level voltage includes a first negative electrode voltage and a first positive electrode voltage to an nth positive electrode voltage. The first negative electrode voltage is used to simulate the voltage of the negative electrode of the first cell, and the nth positive electrode voltage is used to simulate the voltage of the positive electrode of the nth cell.

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