Test circuit and test fixture applying same
By designing an automatic testing circuit for MESH circuits, the problem of low testing efficiency and difficult to guarantee in the prior art is solved, and efficient and accurate circuit testing is achieved, which is especially suitable for mass production environments.
Patent Information
- Application Number
- CN202421195442.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-05-29
AI Technical Summary
In the prior art, testing whether the MESH circuit is off or has a short circuit with GND requires manual use of a multimeter to test one by one. It is low efficiency, time-consuming, and difficult to guarantee the test effect and accuracy, which is not conducive to batch testing.
Design a test circuit, including power supply, indicator light and detection position, through the electrical connection between the power supply and indicator light, automatic testing of the MESH circuit is realized, and the test results are displayed by the light on and off of the indicator light, simplifying operation and improving the accuracy of the test.
Through automated testing circuits, the testing efficiency is improved, the measurement time is reduced, and the accuracy and consistency of test results are ensured, especially in batch testing, which is more advantageous, simplifies the test process and reduces costs.
Smart Images
Figure CN222965260U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit testing, and in particular, to a testing circuit and a testing fixture applying the same. Background Art
[0002] A Mesh network, namely a "Wireless Mesh Network", is a "multi-hop" network, developed from an ad hoc network, and is one of the key technologies to solve the "last mile" problem. With the development of the network, various network devices are needed for networking. In particular, some devices use MESH circuits, and after the circuits are produced, it is necessary to test whether they are qualified to avoid failures of the devices caused by the MESH circuits.
[0003] Currently, to check whether the MESH circuit on the existing test circuit board is open, a multimeter is usually used. As shown in the MESH circuit Figure 2 If it is necessary to test whether there is an open circuit inside the B, I circuit and the C, H circuit, and whether there is a short circuit between the B, I circuit and the C, H circuit and GND, then use a multimeter, set the "short circuit gear", and test the positive and negative poles respectively: B and I, C and H, and whether there is a short circuit between the four points of B / C / H / I and GND. The judgment method is as follows: if B / I and CH are connected, and B, C, H, and J are not connected to GND respectively, it can be judged that there is no open circuit inside the B, I channel and the CH channel circuit, and there is no short circuit with GND.
[0004] Although the multimeter can complete the test of the MESH circuit, it is necessary to manually use the test leads of the multimeter and test one by one (in pairs), with low measurement efficiency, long measurement time, and the test effect and accuracy cannot be guaranteed, which is not conducive to batch testing. Therefore, the utility model provides a testing circuit and a testing fixture applying the same to at least partially solve the problems that may exist in the prior art. Summary of the Utility Model
[0005] In order to overcome or at least partially solve the above problems, an embodiment of the utility model provides a testing circuit and a testing fixture applying the same to at least partially solve the problems that may exist in the prior art.
[0006] The embodiment of the utility model is implemented as follows:
[0007] An embodiment of the present application provides a testing circuit, which is used for the MESH circuit in a circuit board. The testing circuit includes:
[0008] A power supply, one side of which is electrically connected to one ends of a first indicator light, a second indicator light and a third indicator light; the other ends of the first indicator light, the second indicator light and the third indicator light are respectively electrically connected to one ends of a first detection position, a second detection position and a third detection position;
[0009] The other ends of the first detection position and the second detection position are electrically connected to the other end of the power supply; the other end of the third detection position is electrically connected to the ground of the MESH circuit.
[0010] In some embodiments of the present utility model, a switch is electrically connected between the power supply and the other ends of the first detection position and the second detection position.
[0011] In some embodiments of the present utility model, the power supply is a DC power supply.
[0012] In some embodiments of the present utility model, the other ends of the first indicator light, the second indicator light and the third indicator light are respectively electrically connected to one ends of the first detection position, the second detection position and the third detection position through a first resistor, a second resistor and a third resistor.
[0013] In some embodiments of the present utility model, the first indicator light, the second indicator light and the third indicator light are all LEDs (Light Emitting Diodes).
[0014] In some embodiments of the present utility model, the DC power supply is a power supply with a voltage not higher than 36V.
[0015] The embodiments of the present application further provide a display screen and a test fixture, and the test fixture includes a test circuit.
[0016] Compared with the prior art, the embodiments of the present utility model have at least the following advantages or beneficial effects:
[0017] Through the power supply, one side of which is electrically connected to one ends of a first indicator light, a second indicator light and a third indicator light; the other ends of the first indicator light, the second indicator light and the third indicator light are respectively electrically connected to one ends of a first detection position, a second detection position and a third detection position; the other ends of the first detection position and the second detection position are electrically connected to the other end of the power supply; the other end of the third detection position is electrically connected to the ground of the MESH circuit. Through the above test circuit, the operation is simple and convenient; the test is accurate and there will be no measurement error caused by the deviation of the test point click; the result judgment is clear and it is easy to be used for batch product testing. Description of the Drawings
[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for use in the embodiments. It should be understood that the following attached drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant attached drawings can also be obtained based on these attached drawings.
[0019] Figure 1 It is a schematic structural diagram of a test circuit provided in an embodiment of the present utility model;
[0020] Figure 2 It is a schematic structural diagram of a MESH circuit for detection provided in an embodiment of the present utility model.
[0021] In the figure: 101, circuit area; 102, gold finger area. Specific embodiments
[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the attached drawings here can be arranged and designed in various different configurations.
[0023] Embodiment 1
[0024] The following will, in conjunction with the attached drawings, elaborate on some embodiments of the present application. Without conflict, the various embodiments and the various features in the embodiments below can be combined with each other.
[0025] Please refer to Figures 1 to 2 As shown, the embodiment of the present utility model provides a test circuit. The test circuit is used for the MESH circuit in a circuit board. The test circuit includes: a power supply B1, one side of which is electrically connected to one ends of a first indicator lamp LA1, a second indicator lamp LA2, and a third indicator lamp LA3; the other ends of the first indicator lamp LA1, the second indicator lamp LA2, and the third indicator lamp LA3 are respectively electrically connected to one ends of a first detection position, a second detection position, and a third detection position; the other ends of the first detection position and the second detection position are electrically connected to the other end of the power supply B1; the other end of the third detection position is electrically connected to the ground GND of the MESH circuit.
[0026] In this embodiment, the above test circuit is used to test the MESH circuit on the circuit board, which solves the problems of low measurement efficiency, long time consumption, and inability to guarantee the test effect and accuracy when using a multimeter for measurement at present, and is not conducive to batch testing. Through the above test circuit, the automatic test of the MESH circuit is realized by using the electrical connection modes of the first indicator lamp LA1, the second indicator lamp LA2, and the third indicator lamp LA3; as Figure 1 and Figure 2 shown, when in use, the gold fingers of the B channel and the I channel in the gold finger area 102 are electrically connected to the first test position respectively, and the gold fingers of the C channel and the H channel are electrically connected to the second test position respectively, which can be used to test the connectivity of the B and I channels, and the C and H channels respectively; the gold fingers of the B channel, the I channel, the C channel, and the H channel in the gold finger area 102 are electrically connected to one end of the third test position respectively, and the other end of the third position is connected to the ground of the circuit board (i.e., the ground GND of the MESH circuit), and this ground GND is connected to the other end of the power supply B1. Since the third indicator lamp LA3 is connected to one end of the third detection position, when LA3 lights up, it indicates that there is a short circuit in the circuit area 101 in the MESH, otherwise there is no short circuit, so as to test whether B, I, C, and H are short-circuited (short-connected) with respect to the ground GND in the MESH circuit; similarly, in the connectivity test, when the first indicator lamp LA1 lights up, it indicates that a loop is formed from one end of the power supply B1 to the first indicator lamp LA1, then to the gold finger of the B channel, then to the MESH circuit area 101, then to the gold finger of the I channel, and then to the other end of the power supply B1, making the first indicator lamp LA1 light up, indicating that this channel is normally connected and there is no open circuit problem. The above C and H channels have the same principle. Compared with manual measurement one by one using a multimeter, the measurement efficiency is improved, the measurement time is reduced, and the test effect and accuracy can be ensured through the test circuit, which is particularly beneficial in batch testing. Through the above circuit connection method, the test process is simplified, the cost of manual testing is reduced, and higher benefits are provided for the production environment.
[0027] It should be noted that the above-mentioned each channel is only an exemplary description of the connection paths existing between the MESH circuits, and should not be understood as a limitation on the loops in the circuit. For example, B and J may also have connectivity in the circuit and can form loops, etc. In Figure 2 the gold fingers from A to J in the gold finger area 102 are only used as an exemplary description that the circuit has multiple gold finger connection channels, and do not limit the number of gold fingers of the circuit.
[0028] Embodiment 2
[0029] An embodiment of the present utility model provides a test circuit. The above test circuit is used for the MESH circuit in a circuit board. The test circuit includes: a power supply B1, one side of which is electrically connected to one ends of a first indicator light LA1, a second indicator light LA2, and a third indicator light LA3; the other ends of the first indicator light LA1, the second indicator light LA2, and the third indicator light LA3 are respectively electrically connected to one ends of a first detection position, a second detection position, and a third detection position; the other ends of the first detection position and the second detection position are electrically connected to the other end of the power supply B1; the other end of the third detection position is electrically connected to the ground GND of the MESH circuit; wherein a switch K1 is electrically connected between the power supply B1 and the other ends of the first detection position and the second detection position. Through the above switch K1, it is convenient to control the test process through the switch K1.
[0030] The power supply B1 is a DC power supply. Specifically, the DC power supply is a power supply B1 with a voltage not higher than 36V. For example, commonly used 12V power supply, 5V power supply, 3.7V power supply, 3V power supply, etc. Using a lower voltage improves its safety.
[0031] Embodiment 3
[0032] An embodiment of the present utility model provides a test circuit. Among them, the other ends of the first indicator light LA1, the second indicator light LA2, and the third indicator light LA3 are respectively electrically connected to one ends of the first detection position, the second detection position, and the third detection position through a first resistor R1, a second resistor R2, and a third resistor R3. The above resistors form current limiting for the loop to prevent damage to the circuit caused by excessive current during detection.
[0033] Furthermore, the first indicator light LA1, the second indicator light LA2, and the third indicator light LA3 are all LEDs. Among them, the LED used for the third indicator light LA3 can be set to a different color from the first indicator light LA1 and the second indicator light LA2.
[0034] As an example, referring to Figure 1 As shown, connect the pins of the circuit to be tested according to this circuit. I = U / R. According to the short - circuit resistance value to be tested and the voltage of the power supply B1, by adjusting the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3, the short - circuit / break - circuit problems of the circuit to be tested with different impedance magnitudes can be tested.
[0035] For example, the selected red light is used as the third indicator light LA3, with a rated current of 10 mA and a power supply B1 voltage of 10 V. When testing a short circuit of the 1000 Ω level, the third resistor R3 is selected as a 0 Ω resistor, and I = U / R = 10 / 1000 = 10 mA, so that the red light (the third indicator light LA3) lights up to monitor whether there is a short circuit; when testing an open circuit of the 100 Ω level, R3 is selected as a 900 Ω resistor, and I = U / R = 10 / (100 + 900) = 10 mA, so that the third indicator light LA3 (red) lights up to detect whether there is a short circuit;
[0036] And so on, that is: when the circuit switch K1 is closed:
[0037] 1. For the first indicator light LA1, when the green light is on, there is no open circuit in the B and I channel circuits; when it is off, there is an open circuit.
[0038] 2. For the second indicator light LA2, when the green light is on, there is no open circuit in the C and H channel circuits; when it is off, there is an open circuit.
[0039] 3. For the third indicator light LA3, when the red light is on, there is a short circuit between the B, I and C, H channel circuits and GND; when it is off, there is no short circuit.
[0040] 4. By adjusting the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3, short circuits / open circuits of different impedance magnitudes in the circuit under test are tested.
[0041] Through the circuit structure described above, the above MESH circuit can be tested to improve the test efficiency.
[0042] Compared with the existing method of using a multimeter for testing, this application is controlled by the switch K1, with simple and convenient operation; accurate testing, without measurement errors caused by incorrect clicking of the test points; clear result determination, easy to use for batch product testing; the number of circuits under test is not limited, and the increase in the number of circuits under test does not affect the test efficiency; micro-connections of different impedances can be tested (testing for micro-shorts).
[0043] It should be noted that the circuit board is also called a printed circuit board or has other names such as ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin printed circuit board, printed (copper etching technology) circuit board, etc., which is a material for carrying circuits.
[0044] Embodiment 4
[0045] Based on the same inventive concept, an embodiment of the present utility model provides a test fixture, and the test fixture includes the above-mentioned test circuit. By using the test fixture, according to the parameters of the MESH circuit, the parameters of the above-mentioned test circuit are set first. Only by placing the circuit board carrying the above-mentioned MESH circuit on the test fixture can the test be easily completed without using a multimeter to detect one by one, greatly improving the detection efficiency.
[0046] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. Although the optional embodiments of the embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the optional embodiments and all changes and modifications falling within the scope of the embodiments of the present utility model.
[0047] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such article or terminal device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the article or terminal device including the element.
[0048] The technical solutions provided by the present utility model have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present utility model. At the same time, for those of ordinary skill in the art, based on the principles and implementation manners of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.
Claims
1. A test circuit, characterized in that: The test circuit is used for a MESH circuit in a circuit board, and the test circuit includes: A power supply, one side of which is electrically connected to one end of the first indicator light, the second indicator light and the third indicator light; the other ends of the first indicator light, the second indicator light and the third indicator light are electrically connected to one end of the first detection position, the second detection position and the third detection position respectively; The other ends of the first detection position and the second detection position are electrically connected to the other end of the power supply; and the other end of the third detection position is electrically connected to the ground of the MESH circuit.
2. The test circuit according to claim 1, characterized in that: A switch is also electrically connected between the power supply and the other end of the first detection position and the second detection position.
3. The test circuit according to claim 1 or 2, characterized in that: The power supply is a direct current power supply.
4. The test circuit according to claim 1, characterized in that: The other ends of the first indicator light, the second indicator light and the third indicator light are electrically connected to one ends of the first detection position, the second detection position and the third detection position through the first resistor, the second resistor and the third resistor, respectively.
5. The test circuit according to claim 1, characterized in that: The first indicator light, the second indicator light and the third indicator light are all LEDs.
6. The test circuit according to claim 3, characterized in that: The DC power supply is a power supply with a voltage not higher than 36V.
7. A test fixture, characterized in that: The test fixture comprises the test circuit as claimed in any one of claims 1 to 6.