Resistance detection device

Abstract

The application discloses a resistance detection device, and belongs to the technical field of electronic component detection. The resistance detection device comprises a sealed container, which contains a temperature control substance; the temperature control substance has insulation, thermal stability and chemical stability, and a resistance to be detected is immersed in the temperature control substance; a heating assembly is arranged in the sealed container and used for heating the temperature control substance; a resistance detection assembly is connected with the resistance to be detected and used for detecting resistance value data of the resistance to be detected; a control module is used for controlling the heating temperature of the heating assembly, so that the temperature of the temperature control substance is kept in a target temperature range in a target period; the target temperature range is determined based on the boiling point temperature of the temperature control substance; the sealed container has the temperature control substance in a gas phase and the temperature control substance in a liquid phase; the temperature control substance is converted between the liquid phase and the gas phase; the control module is further used for controlling the resistance detection assembly to detect the resistance value data of the resistance to be detected in the target period, and obtaining a resistance value detection result of the resistance to be detected based on the resistance value data of the resistance to be detected.

Description

Technical Field

[0001] This application belongs to the field of electronic component testing technology, and in particular relates to a resistance testing device. Background Technology

[0002] In the field of precision electronic equipment manufacturing, such as 0.01-grade standard energy meters and high-precision data acquisition systems, the long-term stability of key core components is a critical indicator determining equipment performance. Taking standard energy meters as an example, their error rate needs to be controlled within five parts per million (5ppm), while high-precision resistors like the Vishay VHP202Z require a temperature coefficient better than ±0.5ppm / ℃, and a 24-hour drift to the sub-ppm level. To ensure that these components are not affected by ambient temperature drift during long-term stability testing, the tests must be conducted under strictly consistent conditions.

[0003] However, when using a traditional constant-temperature chamber for resistance testing, the limited precision of the chamber's temperature control makes it difficult to guarantee identical temperature conditions for each test, leading to deviations in the test data. This temperature fluctuation directly affects the accuracy of the test results, making it impossible to obtain truly reliable long-term stability data. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a resistance detection device that can keep the resistor under test in a constant temperature environment, and perform resistance value detection on the resistor under test under the same temperature conditions each time, so as to obtain true and reliable long-term stable resistance data.

[0005] In a first aspect, this application provides a resistance detection device, which includes:

[0006] A sealed container is filled with a temperature-controlled substance, which has insulating, thermal, and chemical stability, and the resistor to be tested is immersed in the temperature-controlled substance.

[0007] A heating element, disposed in the sealed container, is used to heat the temperature-controlled substance;

[0008] A resistance detection component is connected to the resistor under test and is used to detect the resistance value of the resistor under test.

[0009] A control module, connected to the heating component and the resistance detection component, is used to control the heating temperature of the heating component so that the temperature of the temperature-controlled substance is maintained within a target temperature range during a target time period. The target temperature range is determined based on the boiling point temperature of the temperature-controlled substance. The sealed container contains both a gaseous phase and a liquid phase of the temperature-controlled substance, which can switch between the liquid and gaseous phases.

[0010] The control module is also used to control the resistance detection component to detect the resistance value data of the resistor under test during the target time period, and to obtain the resistance value detection result of the resistor under test based on the resistance value data of the resistor under test.

[0011] According to the resistance detection device of this application, a temperature-controlled material with insulation, thermal stability, and chemical stability is placed in a sealed container. The resistor to be tested is immersed in the temperature-controlled material. During the target period for detecting the resistance value of the resistor to be tested, the temperature-controlled material is heated by a heating component, so that the temperature of the temperature-controlled material is maintained near the boiling point. When the temperature-controlled material boils, it absorbs latent heat and maintains a constant temperature. The resistor to be tested is in a constant temperature environment, so that the resistance value of the resistor to be tested can be obtained under the same temperature conditions each time, and true and reliable long-term stable resistance data can be obtained.

[0012] According to one embodiment of this application, the resistance detection device further includes:

[0013] A temperature detection component is connected to the control module. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material.

[0014] The control module is also used to acquire the temperature data of the temperature-controlled material, and, based on the temperature data of the temperature-controlled material during the target time period, if it is determined that the temperature of the temperature-controlled material exceeds the target temperature range, control the resistance detection component to stop detecting the resistance value data of the resistor to be tested.

[0015] According to one embodiment of this application, the temperature-controlling substance is a fluorinated liquid.

[0016] According to one embodiment of this application, the fluorinated liquid is of type FC-3284.

[0017] According to one embodiment of this application, the outer shell of the sealed container includes a stainless steel layer and a heat insulation layer, wherein the heat insulation layer is disposed on the outer layer of the stainless steel layer.

[0018] According to one embodiment of this application, the resistance detection device further includes:

[0019] A condensation assembly, located at the upper interior of the sealed container, is used to condense the gaseous temperature-controlled substance into a liquid phase.

[0020] According to one embodiment of this application, the condensation assembly has a spiral structure.

[0021] According to one embodiment of this application, the condensation component is made of copper.

[0022] According to one embodiment of this application, the heating assembly includes a nickel-chromium resistance wire immersed in the temperature-controlled material, and the nickel-chromium resistance wire is connected to a current source.

[0023] According to one embodiment of this application, the surface of the nickel-chromium resistance wire is covered with an aluminum nitride layer.

[0024] According to one embodiment of this application, the resistance detection device further includes:

[0025] A fixed bracket is disposed inside the sealed container, and the resistor to be measured is fixed to the fixed bracket.

[0026] According to one embodiment of this application, the fixing bracket is made of polytetrafluoroethylene.

[0027] According to one embodiment of this application, the resistance detection component is connected to the resistor under test via a gold-plated copper wire.

[0028] According to one embodiment of this application, the resistance detection device further includes:

[0029] A temperature detection component is connected to the control module. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material.

[0030] The control module is used to determine the heating temperature of the heating component based on the deviation information between the temperature data and the target temperature range.

[0031] According to one embodiment of this application, the temperature detection component includes a first temperature detection component and a second temperature detection component. The distance between the first temperature detection component and the resistor to be measured is greater than a distance threshold, and the distance between the second temperature detection component and the resistor to be measured is less than the distance threshold. The first temperature detection component is used to detect a first temperature data of the temperature-controlled material, and the second temperature detection component is used to detect a second temperature data of the temperature-controlled material.

[0032] The control module is used to perform a weighted summation of the first temperature data and the second temperature data to obtain a third temperature data, and to determine the heating temperature of the heating component based on the deviation information between the third temperature data and the target temperature range.

[0033] Additional aspects and advantages 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 this application. Attached Figure Description

[0034] 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:

[0035] Figure 1 This is one of the structural schematic diagrams of the resistance detection device provided in the embodiments of this application;

[0036] Figure 2 This is a second schematic diagram of the resistance detection device provided in the embodiments of this application;

[0037] Figure 3 This is a schematic flowchart of the resistance detection method provided in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0039] Figure label:

[0040] Resistance detection device 100, sealed container 110, heating assembly 120, nickel-chromium resistance wire 121, aluminum nitride layer 122.

[0041] Resistance detection component 130, control module 140, condensation component 150, resistor under test 200, electronic equipment 400.

[0042] Processor 401, memory 402. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0044] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0045] The resistance detection device 100 provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0046] This application provides a resistance detection device 100.

[0047] like Figure 1 As shown, the resistance detection device 100 includes a sealed container 110, a heating component 120, a resistance detection component 130, and a control module 140.

[0048] In this embodiment, the sealed container 110 contains a temperature-controlled material that has insulation, thermal stability, and chemical stability, and the resistor to be tested 200 is immersed in the temperature-controlled material.

[0049] The sealed container 110 is a closed container that can prevent internal substances from leaking or external substances from entering. The internal environment of the sealed container 110 is stable, which can ensure the safety of resistance detection and improve the detection accuracy.

[0050] Temperature-controlled materials are liquids whose temperature can be precisely controlled and maintained. They possess insulation, thermal stability, and chemical stability. Insulation means that they are non-conductive, thermal stability means that they do not easily decompose or volatilize under temperature changes, and chemical stability means that they do not easily react with other substances.

[0051] In this embodiment, the resistor to be tested 200 is completely immersed in the temperature control material. When thermal equilibrium is reached, the temperature of the resistor to be tested 200 is equal to the temperature of the temperature control material.

[0052] In this embodiment, the heating component 120 is disposed in the sealed container 110 and is used to heat the temperature-controlled substance.

[0053] The heating component 120 is a component that can generate heat, such as an electric heating wire, a heating rod, or a thin-film heating element.

[0054] The heating component 120 can be installed inside the sealed container 110 to directly contact the temperature-controlled substance, or it can be placed outside the sealed container 110 to transfer heat through the outer shell of the sealed container 110, so that heat is transferred to the temperature-controlled substance.

[0055] The heating element 120 heats the temperature-controlled material, thereby providing the required test temperature environment for the resistor 200 to be tested, which is immersed in the temperature-controlled material.

[0056] In this embodiment, the resistance detection component 130 is connected to the resistor under test 200 and is used to detect the resistance value data of the resistor under test 200.

[0057] Among them, the resistance detection component 130 is a component that can detect the resistance value. It is set outside the sealed container 110 and connected to the resistor under test 200 to detect the resistance value data of the resistor under test 200 in real time.

[0058] In this embodiment, the control module 140 is connected to the heating component 120 and the resistance detection component 130, and is used to control the heating temperature of the heating component 120 so that the temperature of the temperature-controlled substance is maintained within the target temperature range during the target time period.

[0059] The target time period is the period during which the resistance value of the resistor to be tested (200Ω) is measured.

[0060] The target temperature range is determined based on the boiling point of the temperature-controlled substance. For example, the target temperature range can be the temperature range that differs from the boiling point of the temperature-controlled substance by less than 0.1℃.

[0061] The sealed container 110 contains a gaseous temperature-controlled substance and a liquid temperature-controlled substance, which can be converted between the liquid and gaseous phases.

[0062] In this embodiment, the temperature-controlled material is heated to the target temperature range. During the process of the temperature-controlled material in the sealed container changing between the liquid and gas phases, the temperature can be kept constant by absorbing and releasing the latent heat of phase change.

[0063] A temperature sensor can be immersed in the temperature-controlled material. The control module 140 obtains the temperature data of the temperature-controlled material from the temperature sensor in real time, compares the detected temperature data with the target temperature range, and sends a command to the heating component 120 according to the comparison result through a specific control algorithm. When the temperature of the temperature-controlled material is lower than the lower limit of the target temperature range, the control module 140 controls the heating component 120 to start or increase heating. When the temperature of the temperature-controlled material reaches or exceeds the upper limit of the target temperature range, the control module 140 controls the heating component 120 to stop or reduce heating.

[0064] In this embodiment, the control module 140 is also used to control the resistance detection component 130 to detect the resistance value data of the resistor under test 200 within the target time period, and to obtain the resistance value detection result of the resistor under test 200 based on the resistance value data of the resistor under test 200.

[0065] Understandably, the temperature of the temperature-controlled material is maintained within the target temperature range during the target time period, and the resistor under test 200 is in a near constant temperature environment during the target time period. The control module 140 controls the resistance detection component 130 to detect the resistance value data of the resistor under test 200 according to the set clock frequency during the target time period. The obtained resistance value data is then processed by noise reduction, averaging, etc., to obtain the resistance value detection result of the resistor under test 200.

[0066] In related technologies, when using traditional constant-temperature chambers for resistance testing, the limited precision of chamber temperature control makes it difficult to guarantee identical temperature conditions for each test, leading to deviations in the test data. This temperature fluctuation directly affects the accuracy of the test results, making it impossible to obtain truly reliable long-term stability data.

[0067] According to the resistance detection device 100 provided in the embodiments of this application, a temperature-controlled material with insulation, thermal stability and chemical stability is placed in a sealed container 110. The resistor to be tested 200 is immersed in the temperature-controlled material. During the target period for detecting the resistance value of the resistor to be tested 200, the temperature-controlled material is heated by the heating component 120, so that the temperature of the temperature-controlled material is maintained near the boiling point. When the temperature-controlled material boils, it absorbs latent heat and maintains a constant temperature. The resistor to be tested 200 is in a constant temperature environment, so that the resistance value of the resistor to be tested 200 is detected under the same temperature conditions each time, so that true and reliable long-term stable resistance data can be obtained.

[0068] In some embodiments, the resistance detection device 100 further includes a temperature detection component.

[0069] The temperature detection component is connected to the control module 140. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material.

[0070] Among them, the temperature detection component is a component that can detect the ambient temperature, such as a thermocouple or a thermistor. The temperature detection component is immersed in the temperature control material to detect the temperature data of the temperature control material in real time.

[0071] In this embodiment, the control module 140 is also used to acquire the temperature data of the temperature-controlled material, and, based on the temperature data of the temperature-controlled material within the target time period, if it is determined that the temperature of the temperature-controlled material exceeds the target temperature range, control the resistance detection component 130 to stop detecting the resistance value data of the resistor under test 200.

[0072] The temperature detection component continuously monitors the temperature of the temperature-controlled material and transmits the temperature data to the control module 140. When the temperature of the temperature-controlled material exceeds the target temperature range, the control module 140 controls the resistance detection component 130 to stop working, so as to avoid inaccurate resistance detection due to abnormal temperature.

[0073] In some embodiments, the temperature-controlling substance is a fluorinated liquid.

[0074] Fluorinated liquid is a liquid with chemical stability, thermal stability, electrical insulation, and low viscosity.

[0075] In this embodiment, using fluorinated liquid as a temperature control material can provide precise temperature control, protect the resistance detection device 100 from extreme temperature fluctuations, and ensure the safe operation of the resistance detection device 100.

[0076] In some embodiments, the fluorinated liquid is designated as FC-3284.

[0077] Among them, FC-3284 fluorinated liquid is a transparent, colorless, non-conductive, non-flammable, and residue-free electronic fluorinated liquid with good thermal and chemical stability.

[0078] In some embodiments, the outer shell of the sealed container 110 includes a stainless steel layer and a heat insulation layer, with the heat insulation layer disposed on the outer layer of the stainless steel layer.

[0079] The stainless steel layer is made of stainless steel, which provides robustness, corrosion resistance and good sealing performance. The insulation layer is a layer of heat-insulating material located outside the stainless steel layer, which can reduce heat transfer and maintain the stability of the internal temperature of the sealed container 110.

[0080] In this embodiment, the outer shell of the sealed container 110 is designed with a two-layer structure. The inner layer is a stainless steel layer, which is corrosion resistant and ensures the long-term stable use of the sealed container 110. The outer layer is a heat insulation layer, which is wrapped outside the stainless steel layer and can effectively reduce heat transfer and improve the heat preservation performance of the sealed container 110, so that the inside of the sealed container 110 can maintain a stable temperature environment and is not affected by changes in the external temperature.

[0081] In some embodiments, the resistance detection device 100 further includes a condensation assembly 150.

[0082] The condenser assembly 150 is located at the upper part of the sealed container 110 and is used to condense the gaseous temperature-controlled substance into a liquid phase.

[0083] The condensation component 150 is a component that can convert gaseous substances into liquids.

[0084] In this embodiment, the condensation component 150 is located at the upper part of the sealed container 110, which can cool the gaseous temperature control material and convert it into a liquid phase, so that the temperature control material can be recycled and the resistance detection device 100 can be maintained in stable operation.

[0085] In some embodiments, the condensation assembly 150 has a spiral structure.

[0086] In this embodiment, the condensation component 150 adopts a spiral structure design, which can increase the surface area of ​​the condensation component 150 in contact with the gaseous temperature-controlled substance, improve the cooling efficiency, and thus more effectively condense the gaseous temperature-controlled substance into a liquid.

[0087] In some embodiments, the condenser assembly 150 is made of copper.

[0088] In this embodiment, the condensation component 150 is made of copper, which has good thermal conductivity and corrosion resistance. It can efficiently condense the gaseous temperature control substance into a liquid, ensuring the cooling effect and long-term stable operation of the resistance detection device 100.

[0089] In some embodiments, the heating assembly 120 includes a nickel-chromium resistance wire 121, which is immersed in a temperature-controlled material and connected to a current source.

[0090] Among them, the nickel-chromium resistance wire 121 is a resistance wire made of nickel and chromium alloy, which has high heat resistance and good oxidation resistance. The current source is an electronic device that can provide a constant current output.

[0091] In this embodiment, the nichrome resistance wire 121 is connected to a current source and is immersed in the temperature-controlled material. The current source is located outside the sealed container 110. The nichrome resistance wire 121 generates heat through the connected current source. The nichrome resistance wire 121 can work stably in the temperature-controlled material, effectively control the temperature of the temperature-controlled material, and achieve rapid and precise temperature adjustment of the temperature-controlled material.

[0092] In some embodiments, the surface of the nickel-chromium resistance wire 121 is covered with an aluminum nitride layer 122.

[0093] Aluminum nitride is a ceramic material with high thermal conductivity and excellent insulation properties.

[0094] In this embodiment, covering the surface of the nickel-chromium resistance wire 121 with an aluminum nitride layer 122 can enhance the overall performance of the heating assembly 120, including safety, durability and thermal efficiency, ensuring that the heating assembly 120 can operate stably and efficiently and achieve precise temperature control.

[0095] In some embodiments, the resistance detection device 100 further includes a fixing bracket.

[0096] The fixed bracket is located inside the sealed container 110, and the resistor to be measured 200 is fixed to the fixed bracket.

[0097] The fixing bracket is a device that can securely fix the resistor to be tested 200 at a specific position inside the sealed container 110.

[0098] In this embodiment, by using a fixed bracket, the resistor to be measured 200 can be kept in a stable position and environment, unaffected by external factors such as vibration or movement, thereby ensuring the accuracy and repeatability of the measurement results.

[0099] The fixed bracket can also position the resistor to be tested 200 in the optimal position, so that the resistor to be tested 200 is in full contact with the temperature control material, ensuring uniform temperature distribution and improving heat conduction efficiency.

[0100] In some embodiments, the fixing bracket is made of polytetrafluoroethylene.

[0101] In this embodiment, the fixing bracket is made of polytetrafluoroethylene (PTFE). PTFE has excellent chemical stability, high temperature resistance, and good insulation properties, which can provide stable support and protection for the resistor under test 200, while avoiding measurement interference caused by material reaction or conductivity.

[0102] In some embodiments, the resistance detection component 130 is connected to the resistor under test 200 via gold-plated copper wires.

[0103] Among them, gold-plated copper wires are copper cores with a layer of gold plated on the surface. This combines the high conductivity of copper with the anti-oxidation and corrosion resistance of gold to provide efficient and stable electrical connections.

[0104] In this embodiment, the resistance detection component 130 is connected to the resistor under test 200 via a gold-plated copper wire. The gold-plated copper wire combines the excellent conductivity of copper with the oxidation and corrosion resistance of gold, which can ensure the high efficiency and long-term stability of the electrical connection, reduce contact resistance and signal loss, and provide more accurate resistance detection results.

[0105] In some embodiments, the resistance detection device 100 further includes a temperature detection component connected to the control module 140. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material.

[0106] Among them, the temperature detection component is a component that can detect the ambient temperature, such as a thermocouple or a thermistor. The temperature detection component is immersed in the temperature control material to detect the temperature data of the temperature control material in real time.

[0107] The control module 140 is used to determine the heating temperature of the heating component 120 based on the deviation information between the temperature data and the target temperature range.

[0108] In this embodiment, the control module 140 may include a proportional-integral-derivative controller, and the control module 140 controls the heating temperature of the heating component 120 through the proportional-integral-derivative controller.

[0109] The control module 140 acquires the temperature data of the temperature-controlled material in real time. Based on the deviation information between the real-time temperature of the temperature-controlled material and the target temperature range, the proportional-integral-derivative (PID) controller dynamically adjusts the working state of the heating component 120, thereby achieving precise temperature control. This can effectively reduce temperature fluctuations and improve the stability and response speed of the resistance detection device 100.

[0110] In some embodiments, the temperature detection component includes a first temperature detection component and a second temperature detection component. The distance between the first temperature detection component and the resistor 200 to be measured is greater than a distance threshold, and the distance between the second temperature detection component and the resistor 200 to be measured is less than a distance threshold. The first temperature detection component is used to detect the first temperature data of the temperature-controlled material, and the second temperature detection component is used to detect the second temperature data of the temperature-controlled material.

[0111] The distance threshold is a preset value. The second temperature detection component is closer to the resistor under test 200 than the first temperature detection component. The second temperature detection component can detect the local temperature near the resistor under test 200. The first temperature detection component can detect the overall temperature of the temperature-controlled material. The first temperature detection component can include multiple probes, which are evenly distributed near the inner wall of the sealed container 110.

[0112] For example, the first temperature detection component can be a thin-film type temperature detection component with a sheath outer diameter of 3mm–4mm, a probe tip distance of 10nm–20mm from the inner wall of the sealed container 110, and located 30mm–50mm below the liquid surface of the temperature-controlled substance.

[0113] It is understandable that the first temperature data is the data detected by the first temperature detection component, which can characterize the overall temperature of the temperature-controlled material, and the second temperature data is the data detected by the second temperature detection component, which can characterize the local temperature around the 200Ω resistor under test.

[0114] In this embodiment, the control module 140 is used to perform a weighted summation of the first temperature data and the second temperature data to obtain the third temperature data, and to determine the heating temperature of the heating component 120 based on the deviation information between the third temperature data and the target temperature range.

[0115] The third temperature data is obtained by weighted summation of the first and second temperature data, and can be used as the temperature data for real-time feedback to the PID controller.

[0116] For example, if the first temperature data is T_liq, the second temperature data is T_dut, the boiling point of the temperature-controlled substance is T_set, then the third temperature data is determined as T_ctrl = α·T_liq + (1 α)·T_dut, where α ranges from 0.6 to 0.8, and can be determined to be 0.7. The difference between T_set and T_ctrl is used as deviation information. Based on the deviation information, the heating power command P_cmd is obtained. P_cmd is sent to the heating component 120 to control the heating temperature of the heating component 120, so that the temperature of the temperature-controlled substance is maintained near the boiling point. The heating power command can be implemented using the duty cycle of a solid-state relay. A specific embodiment of a resistance detection device 100 is described below.

[0117] like Figure 2 As shown, the sealed container 110 has a double-layer structure. The inner layer is made of 316L stainless steel with a wall thickness of 2mm to ensure mechanical strength and corrosion resistance. The outer layer is a vacuum insulation layer (vacuum degree ≤ (Pa), effectively reducing heat conduction and radiative heat loss. The inner cavity of the sealed container 110 is cylindrical with a diameter D=113 mm and the liquid level height of the internal temperature-controlled substance H=100 mm.

[0118] The temperature control material is a fluorinated liquid, specifically 3M's FC-3284 fluorinated liquid (boiling point 50℃±0.1℃, latent heat 105kJ / kg). Fluorinated liquids have a constant boiling point, low vapor pressure, and are chemically inert, making them suitable for long-term high-temperature testing environments.

[0119] A spiral condenser assembly 150 is vertically installed above the sealed container 110. The condenser assembly 150 is made of copper and is connected to circulating cooling water. It quickly condenses the evaporated fluorinated liquid vapor into liquid and returns it to the sealed container 110 by gravity, thus realizing the closed-loop recovery of the fluorinated liquid.

[0120] A nickel-chromium resistance wire 121 with a diameter of 1 mm, a length of 4 m, and a resistance of about 6 Ω is embedded in the bottom of the sealed container 110. The nickel-chromium resistance wire 121 can be in the form of an array. The surface of the nickel-chromium resistance wire 121 is covered with an aluminum nitride insulating layer. The heating power is controlled by PID to achieve uniform heat exchange of the liquid.

[0121] The resistor to be measured, 200Ω, is fixed to a PTFE support (coefficient of thermal expansion ≤ 100Ω). The bottom of the polytetrafluoroethylene bracket is pre-embedded with a PT1000 platinum resistance sensor (accuracy ±0.1℃) to monitor the temperature of the temperature-controlled material in real time.

[0122] The resistor leads are made of gold-plated copper wire (0.5mm in diameter, resistivity ≤ 1). (Ω·m), connected to the external four-wire terminal of the sealed container 110 to ensure electrical isolation and signal integrity.

[0123] In this embodiment, the current source outputs current to the nickel-chromium resistance wire 121, heating the nickel-chromium resistance wire 121 and heating the fluorinated liquid to the boiling point (50°C). When the fluorinated liquid boils, it absorbs latent heat, and the temperature is maintained at a constant value at the boiling point.

[0124] A PID controller (proportional band: 10%, integral time: 10s, derivative time: 2s) is used to adjust the power of the heating nickel-chromium resistance wire 121 in real time to maintain the fluorinated liquid in a state of slight boiling (bubble frequency 1HZ-5Hz), ensuring that the temperature fluctuation is ≤±0.01℃, and the temperature is sampled once per second by a PT1000 sensor.

[0125] The following is a specific embodiment of detecting the resistance value of the resistor 200 to be tested using a resistance detection device 100.

[0126] like Figure 3 As shown, during the preheating stage, the heating component 120 is activated to heat the fluorinated liquid to 50°C. Once the temperature stabilizes, i.e., the temperature fluctuation is less than or equal to 50°C for 5 consecutive minutes. At 0.005℃, begin testing the resistance of the 200Ω resistor; otherwise, continue heating.

[0127] During the data acquisition phase, three threads are executed simultaneously: a monitoring thread, a control thread, and an acquisition thread.

[0128] The acquisition thread uses a resistance detection component 130, which can be a high-precision multimeter (resolution: 0.1μΩ, accuracy ±0.005%), to detect the resistance value of the resistor under test 200 in a four-wire manner, and records data every 10 minutes.

[0129] The control thread automatically compensates for temperature fluctuations of the temperature-controlled material through a PID controller, updating every 2 seconds to ensure that the temperature-controlled material remains stable at 50℃±0.01℃.

[0130] The monitoring thread monitors the temperature of the temperature-controlled material in real time. When an abnormality occurs, i.e. the temperature of the temperature-controlled material is not within 50℃±0.01℃, protection is triggered, the resistance detection device 100 automatically cuts off power, and stops detecting the resistance value of the resistor under test 200.

[0131] If the resistance of the 200Ω resistor under test is measured for more than 72 hours, the test is stopped and the resistance test result is generated. The resistance test result can be used to calculate the temperature-resistance curve-drift rate.

[0132] The resistance detection device 100 provided in this application embodiment has significantly improved temperature control accuracy. It adopts fluorinated liquid phase change temperature control technology, and the temperature fluctuation is controlled within ±0.01℃. The derivation process of the temperature fluctuation of the fluorinated liquid phase change temperature control system is as follows:

[0133] According to the system heat balance equation, the temperature fluctuation ΔT is controlled by the heating power and the accuracy ΔP. in The system's heat loss coefficient hA determines the following:

[0134]

[0135] The power regulation resolution of the PID controller is ΔP. in=0.1 W, using a solid state relay (SSR) to control the heating wire, using a 10-bit digital-to-analog converter (DAC) to provide 1024 levels of power regulation, with a minimum switching cycle of 1 second, and the rated power of the heating wire is 100W.

[0136] hA is the system heat loss coefficient. Under steady-state conditions (50℃), the heating power is turned off, and the rate of temperature drop is monitored.

[0137] hA= =

[0138] Test data: During the temperature drop from 50℃ to 25℃, the temperature decrease rate was approximately 0.045 K / min, and the system heat capacity C = 1881 J / KC.

[0139] hA= ≈14 W / KhA (ΔT=0.1 K is the test temperature difference)

[0140] Substituting the parameters, the temperature fluctuation is calculated as follows:

[0141] ΔT= ≈0.007 K (approximately ±0.007℃)

[0142] The resistance detection device 100 provided in this application embodiment has a faster temperature response speed. The following is a calculation of the temperature response speed and preheating time:

[0143] Heat transfer coefficient and time constant: τ=

[0144] The fluorinated liquid has a density ρ = 1710 kg / m³ and a density V = 0.001. The specific heat capacity of the fluorinated liquid is cp = 1100 J / (kg·K), and the mass of the fluorinated liquid is mliquid = ρ × V = 1710 kg / ×0.001 =1.71 kg, heat capacity C=mliquid×cp=1.71×1100=1881J / K, effective heat transfer coefficient =2000W / ( ·K)-5000W / ( ·K).

[0145] After substituting the values, the time constant is obtained as follows:

[0146] τ= =94.05s (lower limit), τ= =37.62 s (upper limit)

[0147] The total preheating time includes sensible heating and the establishment of steady-state during phase change. The sensible heating stage is 25℃-50℃, with a heating capacity of 100W. The required heat is:

[0148] Q 显热 =C×ΔT=1881×25=47025 J

[0149] τ1= = =470.25 s (≈7.8 minutes)

[0150] Phase transition stage (calculated based on 3τ):

[0151] τ2 = 3 × 94.05 = 282.15 s (≈ 4.7 minutes)

[0152] Total time (including 20% ​​margin):

[0153] t 总 =1.2×(7.8+4.7)=15 minutes

[0154] The resistance detection device 100 provided in this embodiment includes a double-layered sealed container 110, the inner layer being made of 316L stainless steel and the outer layer being a vacuum insulation layer (vacuum degree ≤ 100). (Pa) to ensure mechanical strength, corrosion resistance and reduce heat transfer loss.

[0155] The fluorinated liquid uses FC-3284 as the medium. FC-3284 fluorinated liquid has a constant boiling point (50℃±0.1℃), low vapor pressure and chemical inertness, making it suitable for long-term high-temperature testing environments.

[0156] The fluorinated liquid is heated to its boiling point using the heating element 120. When the fluorinated liquid boils, it absorbs latent heat and maintains a constant temperature.

[0157] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0158] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0159] In the description of this application, "multiple" means two or more.

[0160] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0161] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0162] This application embodiment also provides a resistance detection method for detecting the resistance value of the resistor 200 to be tested using a resistance detection device 100.

[0163] The resistance detection method can be applied to the terminal, and can be executed by the hardware or software in the terminal.

[0164] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads). It should also be understood that, in some embodiments, the terminal may not be a portable communication device, but rather a desktop computer with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads).

[0165] The following embodiments describe a terminal including a display and a touch-sensitive surface. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.

[0166] The resistance detection method provided in this application can be executed by an electronic device or a functional module or entity in an electronic device that can implement the resistance detection method. The electronic devices mentioned in this application include, but are not limited to, mobile phones, tablets, and computers. The resistance detection method provided in this application is described below using an electronic device as the execution subject.

[0167] It is understood that the resistance detection method provided in this application embodiment can be executed by the control module 140.

[0168] The resistance detection method includes:

[0169] The heating temperature of the heating component 120 is controlled so that the temperature of the temperature-controlled substance is maintained within the target temperature range during the target time period. The target temperature range is determined based on the boiling point temperature of the temperature-controlled substance.

[0170] Within the target time period, the control resistor detection component 130 detects the resistance value data of the resistor under test 200, and based on the resistance value data of the resistor under test 200, obtains the resistance value detection result of the resistor under test 200.

[0171] According to the resistance detection method provided in this application embodiment, a temperature-controlled material with insulation, thermal stability, and chemical stability is placed in a sealed container 110. The resistor to be tested 200 is immersed in the temperature-controlled material. During the target period for detecting the resistance value of the resistor to be tested 200, the temperature-controlled material is heated by the heating component 120, so that the temperature of the temperature-controlled material is maintained near the boiling point. When the temperature-controlled material boils, it absorbs latent heat and maintains a constant temperature. The resistor to be tested 200 is in a constant temperature environment, so that the resistance value of the resistor to be tested 200 is detected under the same temperature conditions each time, and true and reliable long-term stable resistance data can be obtained.

[0172] In some embodiments, such as Figure 4 As shown, this application embodiment also provides an electronic device 400, including a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the program is executed by the processor 401, it implements the various processes of the above-described resistance detection method embodiment and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0173] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0174] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described resistance detection method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0175] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0176] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described resistance detection method.

[0177] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0178] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described resistance detection method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0179] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0180] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0181] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0182] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0183] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that 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.

[0184] 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 resistance detection device, characterized in that, include: A sealed container is filled with a temperature-controlled substance, which has insulating, thermal, and chemical stability, and the resistor to be tested is immersed in the temperature-controlled substance. A heating element, disposed in the sealed container, is used to heat the temperature-controlled substance; A resistance detection component is connected to the resistor under test and is used to detect the resistance value of the resistor under test. A control module, connected to the heating component and the resistance detection component, is used to control the heating temperature of the heating component so that the temperature of the temperature-controlled substance is maintained within a target temperature range during a target time period. The target temperature range is determined based on the boiling point temperature of the temperature-controlled substance. The sealed container contains both a gaseous phase and a liquid phase of the temperature-controlled substance, which can switch between the liquid and gaseous phases. The control module is also used to control the resistance detection component to detect the resistance value data of the resistor under test during the target time period, and to obtain the resistance value detection result of the resistor under test based on the resistance value data of the resistor under test. The temperature-controlling substance is a fluorinated liquid; The fluorinated liquid is of type FC-3284; The resistance detection device also includes: A temperature detection component is connected to the control module. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material. The control module is used to determine the heating temperature of the heating component based on the deviation information between the temperature data and the target temperature range; The temperature detection component includes a first temperature detection component and a second temperature detection component. The distance between the first temperature detection component and the resistor to be tested is greater than a distance threshold, and the distance between the second temperature detection component and the resistor to be tested is less than the distance threshold. The first temperature detection component is used to detect the first temperature data of the temperature-controlled material, and the second temperature detection component is used to detect the second temperature data of the temperature-controlled material. The control module is used to perform a weighted summation of the first temperature data and the second temperature data to obtain a third temperature data, and to determine the heating temperature of the heating component based on the deviation information between the third temperature data and the target temperature range. The first temperature data is T_liq, the second temperature data is T_dut, the boiling point of the temperature-controlled substance is T_set, and the third temperature data is determined as T_ctrl = α·T_liq + (1 α)·T_dut, where α ranges from 0.6 to 0.8, the difference between T_set and T_ctrl is used as deviation information, the heating power command P_cmd is obtained based on the deviation information, P_cmd is sent to the heating component to control the heating temperature of the heating component; The resistance detection device further includes: A condensation assembly, located at the upper interior of the sealed container, is used to condense the gaseous temperature-controlled substance into a liquid phase; The condensation assembly has a spiral structure; The condenser assembly is made of copper.

2. The resistance detection device according to claim 1, characterized in that, Also includes: A temperature detection component is connected to the control module. The temperature detection component is immersed in the temperature-controlled material to detect the temperature data of the temperature-controlled material. The control module is also used to acquire the temperature data of the temperature-controlled material, and, based on the temperature data of the temperature-controlled material during the target time period, if it is determined that the temperature of the temperature-controlled material exceeds the target temperature range, control the resistance detection component to stop detecting the resistance value data of the resistor to be tested.

3. The resistance detection device according to claim 1 or 2, characterized in that, The outer shell of the sealed container includes a stainless steel layer and a heat insulation layer, with the heat insulation layer disposed on the outer layer of the stainless steel layer.

4. The resistance detection device according to claim 1 or 2, characterized in that, The heating component includes a nickel-chromium resistance wire, which is immersed in the temperature-controlled material and connected to a current source.

5. The resistance detection device according to claim 4, characterized in that, The surface of the nickel-chromium resistance wire is covered with an aluminum nitride layer.

6. The resistance detection device according to claim 1 or 2, characterized in that, Also includes: A fixed bracket is disposed inside the sealed container, and the resistor to be measured is fixed to the fixed bracket.

7. The resistance detection device according to claim 6, characterized in that, The fixing bracket is made of polytetrafluoroethylene.

8. The resistance detection device according to claim 1 or 2, characterized in that, The resistance detection component is connected to the resistor under test via gold-plated copper wires.

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