Continuous adjustment type NTC (Negative Temperature Coefficient) testing device

Abstract

The utility model relates to the technical field of test equipment, and particularly discloses a continuously adjustable NTC test device, which comprises a test function board internally provided with an NTC circuit; wherein the NTC circuit is provided with a first bonding pad and a second bonding pad which are used for accessing an NTC resistor; the function board jig comprises a jig body used for fixing the test function board, a first insertion column sleeve electrically connected to the first bonding pad, and a second insertion column sleeve electrically connected to the second bonding pad; one terminal of the slide rheostat is electrically connected to the first insertion column sleeve, and the other terminal of the slide rheostat is electrically connected to the second insertion column sleeve. The continuous adjustment type NTC test device provided by the utility model can effectively solve the problem that the NTC related circuit function trigger test efficiency is low in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a continuously adjustable NTC testing device. Background Art

[0002] The NTC resistor refers to a negative temperature coefficient thermistor (Negative Temperature Coefficient Resistance), whose resistance value decreases as the temperature increases. In an NTC circuit, the NTC resistor can sense the change of the ambient temperature and reflect this change by changing its own resistance value, so as to realize circuit functions such as temperature measurement, temperature compensation, and overheat protection.

[0003] Generally, NTC resistors are provided on the main boards of many electronic products such as Bluetooth headsets or mobile phones. Since the NTC resistor will generate different resistance values at different temperatures, in order to test whether the corresponding circuit functions can be triggered normally at different resistance values, it is often necessary to put the main board into a temperature control test chamber for testing.

[0004] Specifically, the test steps are as follows:

[0005] ① Put the main board to be tested with an NTC resistor into a temperature-adjustable temperature control test chamber, and monitor the working parameters of the main board to be tested in real time;

[0006] ② Adjust the temperature control test chamber to the preset temperature and wait for the temperature control test chamber to adjust the temperature;

[0007] ③ After the temperature in the temperature control test chamber is stable, obtain the working parameters of the main board to be tested, and thus detect whether the corresponding circuit functions can be triggered normally.

[0008] There are the following two problems in the prior art:

[0009] Each time a test is performed, it is necessary to adjust the temperature of the temperature control test chamber and then wait for the temperature to become constant. This process takes a long time, resulting in low test efficiency.

[0010] Therefore, the utility model is committed to developing a continuously adjustable NTC testing device to solve the problem of low test efficiency in triggering the circuit functions related to NTC in the prior art.

[0011] The above information disclosed in this background section is only included to enhance the understanding of the background of the present disclosure, and thus may include information that does not form the prior art known to those of ordinary skill in the art at present. Summary of the Utility Model

[0012] An object of the present utility model is to provide a continuously adjustable NTC test device, which can effectively solve the problem of low test efficiency of NTC-related circuit function triggering in the prior art.

[0013] To achieve the above object, the present utility model provides a continuously adjustable NTC test device, including:

[0014] Including:

[0015] A test function board, the test function board contains an NTC circuit; wherein, the NTC circuit is provided with a first pad and a second pad for connecting an NTC resistor.

[0016] A function board fixture, the function board fixture includes a fixture body for fixing the test function board, a first plug post sleeve electrically connected to the first pad, and a second plug post sleeve electrically connected to the second pad.

[0017] A sliding rheostat, one terminal of the sliding rheostat is electrically connected to the first plug post sleeve, and the other terminal is electrically connected to the second plug post sleeve.

[0018] Optionally, each of the first plug post sleeve and the second plug post sleeve is electrically connected to the sliding rheostat through a fast wiring harness.

[0019] Optionally, the fast wiring harness includes a wiring clip for clamping the terminal of the sliding rheostat, a conductive plug post for plugging into the first plug post sleeve or the second plug post sleeve, and a connecting wire electrically connecting the wiring clip and the conductive plug post.

[0020] Optionally, the conductive plug post includes a metal conductive part for electrically plugging into the first plug post sleeve or the second plug post sleeve, a counterweight block located above the metal conductive part, and an insulating connecting part connecting the metal conductive part and the counterweight block.

[0021] Optionally, the density of the counterweight block is greater than the density of the metal conductive part.

[0022] Optionally, the contact surface between the metal conductive part and the first plug post sleeve or the second plug post sleeve is a conical surface.

[0023] Optionally, the fixture body is provided with a function board positioning groove for accommodating the test function board.

[0024] Optionally, the function board positioning groove is provided with avoidance grooves corresponding to the positions of the first pad and the second pad, and a first probe for electrically connecting to the first pad and a second probe for electrically connecting to the second pad are fixedly arranged in the avoidance grooves.

[0025] Optionally, the first probe is electrically connected to the first post sleeve;

[0026] The second probe is electrically connected to the second post sleeve.

[0027] The beneficial effects of the present utility model are as follows: A continuously adjustable NTC test device is provided. By connecting a sliding rheostat between the first pad and the second pad through the first post sleeve and the second post sleeve, the NTC circuit of the functional board uses a sliding rheostat to replace the NTC resistor in the NTC circuit to be measured;

[0028] When it is necessary to trigger the circuit function that should have been triggered by the NTC resistor, the output resistance of the sliding rheostat can be directly adjusted so that the output resistance of the sliding rheostat meets the triggering requirements of the relevant circuit function, and then the verification of the relevant triggering effect is carried out.

[0029] That is, for the continuously adjustable NTC test device provided by the present utility model, when performing the triggering test of the circuit function, only the output resistance of the sliding rheostat needs to be directly adjusted, without the need to adjust the ambient temperature, which greatly shortens the test time and thus improves the test efficiency.

[0030] Therefore, the continuously adjustable NTC test device provided by the present utility model can effectively solve the problem of low test efficiency in triggering the circuit function related to NTC in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the continuously adjustable NTC test device provided for the embodiment.

[0033] In the figure:

[0034] 1. Test function board; 101. First pad; 102. Second pad;

[0035] 2. Functional board fixture; 201. Fixture body; 202. First post sleeve; 203. Second post sleeve; 204. First probe; 205. Second probe;

[0036] 3. Sliding rheostat;

[0037] 4. Quick connection harness; 401. Wiring clip; 402. Conductive plug; 4021. Metal conductive part; 4021a. Conical surface; 4022. Counterweight; 4023. Insulating connection part; 403. Connecting wire. Detailed implementation manners

[0038] In the present utility model, the mention of "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present utility model. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present utility model, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present utility model belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present utility model.

[0040] In the description of the present utility model, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.

[0041] In the present utility model, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary-secondary or sequential relationship, etc. between these entities or operations.

[0042] Without more limitations, in the present utility model, the expressions such as "including", "comprising", "having" or other similar expressions used in the statements are intended to cover non-exclusive inclusion. These expressions do not exclude that there may be other elements in the process, method or product including the said elements, so that the process, method or product including a series of elements may not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to this process, method or product.

[0043] Similar to the understanding in the "Examination Guidelines", in this utility model, expressions such as "greater than", "less than", "exceeding", etc. are understood as not including the base number; expressions such as "above", "below", "within", etc. are understood as including the base number. In addition, in the description of the embodiments of this utility model, the meaning of "multiple" is two or more (including two), and similar expressions related to "many" are understood in the same way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically defined.

[0044] In the description of the embodiments of this utility model, the space-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the attached drawings. It is only for the convenience of describing the specific embodiments of this utility model or for the reader to understand, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it cannot be understood as a limitation to the embodiments of this utility model.

[0045] Unless otherwise clearly specified or limited, in the description of the embodiments of this utility model, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which this utility model belongs, the specific meanings of the above terms in the embodiments of this utility model can be understood according to specific circumstances.

[0046] This utility model provides a continuously adjustable NTC test device, which is applicable to the application scenario of triggering and testing the circuit functions related to NTC for the main board to be tested containing NTC circuits, and can effectively solve the problem of low efficiency in triggering and testing the circuit functions related to NTC in the prior art.

[0047] See Figure 1 , the continuously adjustable NTC test device provided in this embodiment includes a test function board 1, a function board fixture 2, and a sliding rheostat 3.

[0048] The test function board 1 contains an NTC circuit. Among them, the NTC circuit is provided with a first pad 101 and a second pad 102 for connecting an NTC resistor. The function board fixture 2 includes a fixture body 201 for fixing the test function board 1, a first plug sleeve 202 electrically connected to the first pad 101, and a second plug sleeve 203 electrically connected to the second pad 102. One terminal of the sliding rheostat 3 is electrically connected to the first plug sleeve 202, and the other terminal is electrically connected to the second plug sleeve 203.

[0049] It should be noted that the NTC circuit contained in the test function board 1 (hereinafter referred to as the "function board NTC circuit") is the same as the NTC circuit contained in the main board to be tested (hereinafter referred to as the "to-be-tested NTC circuit") as a whole. The difference between the two is that the to-be-tested NTC circuit directly has an NTC resistor set. In the position where the NTC resistor should be set in the function board NTC circuit, the NTC resistor is removed, and only the first pad 101 and the second pad 102 that can connect the NTC resistor are retained. In other words, for the test function board 1 provided in this embodiment, if a resistor is not connected between the first pad 101 and the second pad 102, the first pad 101 and the second pad 102 are in an open circuit state, and the function board NTC circuit is incomplete. If an NTC resistor is connected between the first pad 101 and the second pad 102, the function board NTC circuit will be exactly the same as the to-be-tested NTC circuit.

[0050] For the continuously adjustable NTC test device provided in this embodiment, the sliding rheostat 3 is connected between the first pad 101 and the second pad 102 through the first plug sleeve 202 and the second plug sleeve 203, so that the function board NTC circuit uses a sliding rheostat 3 to replace the NTC resistor in the to-be-tested NTC circuit;

[0051] When it is necessary to trigger the circuit function that should be triggered by the NTC resistor, the output resistance of the sliding rheostat 3 can be directly adjusted so that the output resistance of the sliding rheostat 3 meets the triggering requirements of the relevant circuit function, and then the verification of the relevant triggering effect is carried out.

[0052] For the continuously adjustable NTC test device provided in this embodiment, when performing the triggering test of the circuit function, the output resistance of the sliding rheostat 3 can be directly adjusted, and there is no need to adjust the ambient temperature, which greatly shortens the test time and thus improves the test efficiency.

[0053] Therefore, the continuously adjustable NTC test device provided by the present invention can effectively solve the problem of low efficiency in triggering the test of NTC-related circuit functions in the prior art.

[0054] It should be noted that the sliding rheostat 3 can continuously change the magnitude of the output resistance. It is a common electrical component, and its specific structure and working principle are not the focus of this embodiment, so they will not be elaborated here.

[0055] Optionally, the fixture body 201 is provided with a function board positioning groove for accommodating the test function board 1. The function board positioning groove is provided with avoidance grooves corresponding to the positions of the first pad 101 and the second pad 102. A first probe 204 for electrically connecting to the first pad 101 and a second probe 205 for electrically connecting to the second pad 102 are fixedly arranged in the avoidance grooves. The first probe 204 is electrically connected to the first plug post sleeve 202; the second probe 205 is electrically connected to the second plug post sleeve 203.

[0056] In this embodiment, the first plug post sleeve 202 and the second plug post sleeve 203 are each electrically connected to the sliding rheostat 3 through a quick wiring harness 4. The first plug post sleeve 202 and the second plug post sleeve 203 are electrically connected to the sliding rheostat 3 through the quick wiring harness 4. The use of the quick wiring harness 4 facilitates quick connection and disassembly, improving the flexibility of the test device.

[0057] Optionally, the quick wiring harness 4 includes a wiring clip 401 for clamping the terminal of the sliding rheostat 3, a conductive plug post 402 for plugging into the first plug post sleeve 202 or the second plug post sleeve 203, and a connecting wire 403 for electrically connecting the wiring clip 401 and the conductive plug post 402. The direct plugging operation between the conductive plug post 402 and the plug post sleeve is convenient for installation and disassembly, greatly improving the installation and disassembly efficiency.

[0058] Furthermore, the conductive plug post 402 includes a metal conductive part 4021 for electrically plugging into the first plug post sleeve 202 or the second plug post sleeve 203, a weight block 4022 located above the metal conductive part 4021, and an insulating connecting part 4023 connecting the metal conductive part 4021 and the weight block 4022. The use of the insulating sleeve can effectively prevent short circuits and ensure the safety of the test process.

[0059] In this embodiment, the density of the weight block 4022 is greater than the density of the metal conductive part 4021. The weight block 4022 with a larger density can press down the metal conductive part 4021, preventing the conductive metal part from disengaging upward from the first plug post sleeve 202 or the second plug post sleeve 203, thereby ensuring the reliability of the conductive connection.

[0060] Further, the contact surface between the metal conductive part 4021 and the first plug sleeve 202 or the second plug sleeve 203 is a conical surface 4021a. Under the pressure of the counterweight 4022, the matching manner of the conical surface 4021a is conducive to making the metal conductive part 4021 closely fit the first plug sleeve 202 or the second plug sleeve 203, thereby improving the reliability of the conductive connection.

[0061] In summary, the continuously adjustable NTC test device provided in this embodiment has the following advantages:

[0062] ① Through the adjustment of the sliding rheostat 3, the continuous simulation of the NTC resistance is realized. There is no need to adjust the ambient temperature, which greatly shortens the test time and improves the test efficiency;

[0063] ② The output resistance of the sliding rheostat 3 is continuously adjustable, which is conducive to realizing the non-interval continuous linear simulation of the NTC resistance and meeting more diverse test requirements;

[0064] ③ The design of relying on the counterweight 4022 to press the metal conductive part 4021 to achieve conductive connection has a simple structure and is convenient for installation and disassembly;

[0065] ④ The design of the conical surface 4021a greatly improves the installation and disassembly efficiency and at the same time ensures good electrical conductivity.

[0066] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of this application, the patent protection scope of this application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of this application and using the content recorded in the text and drawings of the specification of this application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of this application.

Claims

1. A continuously adjustable NTC test device, characterized in that: include: A test function board (1), the test function board (1) containing an NTC circuit; wherein the NTC circuit is provided with a first soldering pad (101) and a second soldering pad (102) for connecting an NTC resistor; A function board jig (2), the function board jig (2) comprising a jig body (201) for fixing the test function board (1), a first plug-in column sleeve (202) electrically connected to the first solder pad (101), and a second plug-in column sleeve (203) electrically connected to the second solder pad (102); A sliding rheostat (3), wherein one terminal of the sliding rheostat (3) is electrically connected to the first plug-in column sleeve (202), and the other terminal is electrically connected to the second plug-in column sleeve (203).

2. The continuously adjustable NTC test device according to claim 1, characterized in that: The first plug-in column sleeve (202) and the second plug-in column sleeve (203) are each electrically connected to the sliding rheostat (3) via a quick-connect harness (4).

3. The continuously adjustable NTC test device according to claim 2, characterized in that: The quick-connect harness (4) comprises a wiring clamp (401) for clamping the terminal of the sliding rheostat (3), a conductive plug post (402) for plugging into the first plug post sleeve (202) or the second plug post sleeve (203), and a connecting wire (403) for electrically connecting the wiring clamp (401) and the conductive plug post (402).

4. The continuously adjustable NTC test device according to claim 3, characterized in that: The conductive plug (402) comprises a metal conductive portion (4021) for conductively plugging with the first plug sleeve (202) or the second plug sleeve (203), a counterweight (4022) located above the metal conductive portion (4021), and an insulating connecting portion (4023) connecting the metal conductive portion (4021) and the counterweight (4022).

5. The continuously adjustable NTC test device according to claim 4, characterized in that: The density of the counterweight block (4022) is greater than the density of the metal conductive part (4021).

6. The continuously adjustable NTC test device according to claim 4, characterized in that: The contact surface between the metal conductive part (4021) and the first plug-in column sleeve (202) or the second plug-in column sleeve (203) is a conical surface (4021a).

7. The continuously adjustable NTC test device according to claim 1, characterized in that: The fixture body (201) is provided with a function board positioning groove for accommodating the test function board (1).

8. The continuously adjustable NTC test device according to claim 7, characterized in that: The functional board positioning groove is provided with an avoidance groove at positions corresponding to the first solder pad (101) and the second solder pad (102), and a first probe (204) for electrically connecting to the first solder pad (101) and a second probe (205) for electrically connecting to the second solder pad (102) are fixedly arranged in the avoidance groove.

9. The continuously adjustable NTC test device according to claim 8, characterized in that: The first probe (204) is electrically connected to the first plug sleeve (202); The second probe (205) is electrically connected to the second plug sleeve (203).

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