Double-screw-lug NTC (Negative Temperature Coefficient) temperature collection sensor assembly

Abstract

The invention discloses a double-screw-lug type NTC (Negative Temperature Coefficient) temperature acquisition sensor assembly. The double-screw-lug type NTC temperature acquisition sensor assembly is reinforced on the surfaces of two power device radiators on a tested PWR (Pulse Width Resonance) power board by using screws in a 1U semi-bipolar power supply complete machine; the double-screw lug type NTC temperature acquisition sensor assembly comprises a screw lug terminal, and a thermistor is placed in a protection buckle of the screw lug terminal and is encapsulated by flexible epoxy resin; two pins of the thermistor are welded and led out through leads, and when the leads are bent, the bending radius of the leads is larger than 2 mm. The structure of the sensor is convenient to install on the radiator, and the temperature of a test surface on the sensitive radiator is synchronously monitored in real time; machining is easy to achieve, a good machining process method is achieved, the assembly matching relation size is reasonable, the technical requirement of the whole machine is met, and meanwhile the overall quality warehousing qualification rate of products is increased.

Description

Technical Field

[0001] The invention relates to a power supply device, in particular to a double screw ear type NTC temperature sampling sensor component. Background Art

[0002] With the development of electronic science and technology, more integrated, larger current, smaller and thinner power supply technology has emerged, and power supply equipment has become diversified and high-density, which has put forward higher requirements on the internal layout, external dimensions and installation methods of the power supply. There are many high-temperature control points in the power supply, among which the heat sinks of many power devices under test need temperature collection. Single-point data collection is usually used to meet the adaptability of materials such as sensitive components, connecting wires, fixing seats, and local protective covers.

[0003] However, when collecting temperatures at multiple different locations, reasonable measurement accuracy must be ensured, and the temperature sensors must be isolated from the ambient atmosphere and from thermal radiation sources.

[0004] Usually, high-power devices are installed on radiators to facilitate heat dissipation. To ensure the safe and reliable operation of the devices or modules, the temperature of the radiator needs to be collected. The sensor quickly tracks the temperature changes of the radiator and transmits the data to the main control board in real time. The main control board brain calculates the fan in real time and reasonably controls the fan based on the feedback data. The fan cools at different wind speeds.

[0005] Based on the above reasons, it is necessary to process a multi-point temperature acquisition NTC sensor component for real-time monitoring of high temperature and high reliability.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a double screw ear type NTC temperature sensor assembly to solve the above technical problems existing in the prior art.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The double screw ear NTC temperature sensor assembly of the present invention is inside a 1U semi-bipolar power supply unit, and the surfaces of two power device heat sinks on the PWR power board to be tested are reinforced with screws to reinforce the double screw ear NTC temperature sensor assembly;

[0010] The double screw ear NTC temperature sensor assembly includes a screw ear terminal, and the thermistor is placed in the protective buckle of the screw ear terminal and potted with flexible epoxy resin;

[0011] The two pins of the thermistor are led out by welding wires, and when the wires are bent, the bending radius of the wires is greater than 2 mm.

[0012] Compared with the prior art, the double screw ear NTC temperature sensor assembly provided by the present invention has a narrow physical structure layout space with multiple heat dissipation in high-density current element sampling, which not only satisfies the structure of the sensor to be conveniently installed on the radiator, but also simultaneously monitors the test surface temperature on the sensitive radiator in real time; makes full use of the spatial layout, reasonable process design, selects the double NTC temperature resistance acquisition assembly wiring harness, follows the three design principles of "universalization, serialization, and interchangeability", meets the "interface and interchangeability requirements", uses the least time, the most economical investment, and the most mature technology, implements the product interface standards and implementation requirements, and has good functionality and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The resistance-temperature curve of the NTC temperature sensor (B25 / 85=3975K) in the embodiment of the present invention;

[0014] Figure 2a , Figure 2b They are respectively the front view and top view schematic diagrams of thermistor components and lead sizes in an embodiment of the present invention;

[0015] Figure 3 This is a dimension processing diagram of a double screw ear type NTC temperature sensor assembly in an embodiment of the present invention;

[0016] Figure 4 It is a schematic diagram of the application circuit principle of the double screw ear type NTC temperature sensor component in an embodiment of the present invention.

[0017] In the figure:

[0018] 1. Thermistor, 2. Pin node, 3. Lead, 4. Screw terminal, 5. Heat shrink tube plastic sealing (each section is 20mm, three sections in total), 6. A1008H-4P (front, convex card surface). DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0020] First, the terms that may be used in this article are explained as follows:

[0021] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0022] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0023] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0024] The double screw ear NTC temperature sensor assembly of the present invention is inside a 1U semi-bipolar power supply unit, and the surfaces of two power device heat sinks on the PWR power board to be tested are reinforced with screws to reinforce the double screw ear NTC temperature sensor assembly;

[0025] The double screw ear NTC temperature sensor assembly includes a screw ear terminal, and the thermistor is placed in the protective buckle of the screw ear terminal and potted with flexible epoxy resin;

[0026] The two pins of the thermistor are led out by welding wires, and when the wires are bent, the bending radius of the wires is greater than 2 mm.

[0027] The screw ear terminal is formed by stamping H62 brass, and the placement position of the thermistor is a rectangular three-sided buckle structure. The lead wire on the curing component side of the thermistor and the thermistor body are both located in the terminal rectangular buckle.

[0028] The screw ear terminal is fixed to two radiator positions with three combination screws of M3*6, and the contact metal surface is tinned. The screw ear terminal is provided with a circular mounting hole with an inner diameter of φ3.2 and an outer diameter of φ7.5.

[0029] The thermistor is an NTC thermistor.

[0030] The ends of the two thermistors are provided with three sections of black single-arm heat shrink tubing with a length of 20 mm and an interval of 20 mm. After the wiring harness is gathered into a bundle, it is connected to an A1008H-4P plug.

[0031] The A1008H-4P plug of the double screw ear type NTC temperature sensor assembly is connected to the A1008-4P socket of the main control board CN30.

[0032] The two thermistors of the double-screw ear NTC temperature sensor assembly measure the temperature of the two radiators inside the power supply in real time and accurately, and transmit the collected temperature data to the MCU microcontroller of the main control board for calculation and processing through the A / D analog-to-digital signal converter, and output the PWR control signal to control the speed of the two fans in the system, which can ensure the normal operation of the entire system circuit.

[0033] In summary, the double screw ear NTC temperature sensor assembly of the embodiment of the present invention is inside the 1U semi-bipolar power supply unit, and the heat sink of the high-power device in two special-shaped and narrow physical space positions on the PWR power board not only meets the structure of the sensor to be conveniently installed on the heat sink, but also simultaneously monitors the test surface temperature on the sensitive heat sink in real time;

[0034] Make full use of the space layout, reasonable process design, select the dual NTC temperature collection resistor collection component harness, follow the "universalization, serialization, and interchangeability" three-dimensional design principles, meet the "interface and interchangeability requirements", use the least time, the most economical investment, the most mature technology, implement the product interface standards and implementation requirements, and have good functionality and applicability;

[0035] When does the fan in the power supply start and adjust the speed? The power supply load becomes hot, and the precision components that are sensitive to heat in the machine may be damaged. The negative temperature coefficient NTC thermistor uses a negative temperature coefficient resistor to measure the temperature inside the device, and then transmits the temperature signal to the main control board, which controls the fan speed.

[0036] In the present invention, the wiring harness component structure layout meets the physical location requirements of the wiring installation space, the component function design and the inherent characteristics of each material must be reasonably and perfectly matched to ensure accurate measurement of the heat of a 1U semi-high-performance DC power supply, while taking into account stable performance, low investment cost, reasonable wiring assembly, reasonable labor cost, and easy processing and implementation.

[0037] The modular structured high-voltage wiring harness of the present invention adopts screw ear reinforcement to meet the requirements of frequent removal, convenient installation, and reusability. The wiring harness wire cross-sectional area, temperature requirements, flexibility, and optimized anti-interference shielding effect of the components are quantitatively tailored to avoid excessive size and excessive components. The overall size of the components fully matches the narrow use environment space.

[0038] The processing method of the double-screw ear NTC temperature sensor component: it meets the reasonable limited space layout connection, ensures the stability of the temperature sampling function and the safety of the performance; the processing is easy to implement, has a better processing method, the component matching relationship size is reasonable, meets the technical requirements of the whole machine, and at the same time improves the overall quality of the product warehousing qualification rate.

[0039] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0040] Example 1

[0041] like Figures 1 to 4 As shown:

[0042] Determined by technical requirements:

[0043] like Figure 1 As shown, the NTC brand thermistor is selected, and its resistance parameter is R25 = 10KΩ ± 5%. The NTC thermistor has a large resistance at room temperature, and the resistance value gradually decreases as the temperature rises. The NTC thermistor is an important sensitive component. The thermal insulation performance of the NTC temperature sensor component is good. The test temperature range of 25℃ to 85℃ shows that the rate at which the resistance value of the NTC thermistor changes with temperature is B25 / 85 = 3975K ± 5%. It can be seen that the component has high reliability, a small time constant, and a temperature range of -40 to 120℃.

[0044] like Figure 2a , Figure 2b As shown in the figure, the thermistor component size is 2.7*2.8*2.3, and its internal structure is fragile and easily affected by the external environment. In order to solve the short life and poor stability of the thermistor, a certain amount of flexible epoxy resin is used to wrap the thermistor in the protective buckle of the screw ear terminal, which can effectively enhance its impact resistance and thermal shock resistance. Epoxy resin has excellent insulation and corrosion resistance, which can isolate the influence of the external environment on the thermistor, ensure its normal operation, and improve the overall performance and reliability of the power supply product.

[0045] like Figure 3As shown in Table 1, the screw ear terminal is stamped with H62 brass. The inner diameter of the circular inner hole is φ3.2 and the outer diameter is φ7.5. It can be screwed to two radiator positions with M3*6 three-combination screws. The contact metal surface is tinned for oxidation resistance. The metal contacts have good conductivity to ensure the working stability and reliability of electrical components. The thermistor is placed in a rectangular three-sided buckle type, which provides good protection for the thermistor body and is easy to quantitatively pot with epoxy resin glue. The two pins of the thermistor are welded and led out with UL10362#28 black American standard wire. When bending the lead, the lead bending radius is greater than 2mm. The lead on the curing component side and the thermistor body are exactly located in the terminal rectangular buckle. During the process, the lead tension is strictly controlled to prevent the joint between the lead and the component from being disconnected or cracked. The two temperature resistors are in different positions, and the length of the reinforcement wire is different. One is 240mm and the other is 210mm. UL is selected to ensure the bending flexibility of the wiring. Three sections of 20mm black single-arm heat shrink tubing are used at the ends of the two temperature-collecting resistor components with an interval of 20mm. It also plays a role in wire protection and bundles the wires together, and then uses an A1008H-4P plug.

[0046] Table 1: Material matching list of resistor components

[0047]

[0048] like Figure 4 As shown in the figure, the 4P plug of the double screw ear NTC temperature sensor assembly is connected to the A1008-4P socket of the main control board CN30. The two temperature thermistors of the double screw ear NTC temperature sensor assembly accurately measure the temperature of the two heat sinks inside the power supply in real time, and transmit the collected temperature data to the MCU microcontroller of the main control board for calculation and processing through the A / D analog-to-digital signal converter, and output the PWR control signal system to control the speed of the two fans in the system to ensure the normal operation of the whole system circuit.

[0049] In short, the temperature of the product system environment can be obtained by measuring the resistance value of the NTC thermistor, real-time temperature point monitoring, and quick response and timely adjustment of the fan speed. The packaging and installation method of this component meets the requirements of the 1U semi-complete machine structure size, space layout and system environment, and improves the overall quality of the product. This component is simple and convenient to use and install, which can reduce the manual assembly time of the product.

[0050] Double screw ear NTC temperature sensor assembly processing method:

[0051] The structural dimensions and positions of the two power device heat sinks on the PWR board under test, and the model specifications and positions of the acquisition terminals on the main control board.

[0052] Both ends of the component are reliable and stable, with certain mechanical strength; the line length is appropriate, considering the actual wiring distance and leaving reasonable redundancy; the direction is correct, with error-proof process design, neat and beautiful, and reasonably saving assembly and wiring man-hours.

[0053] The environmental conditions of the heat sink of the power device under test must ensure that the temperature measuring element will not be damaged. When the temperature of the heat sink under test changes dynamically, the hysteresis of the sensor component must meet the temperature measurement requirements.

[0054] Comprehensively consider the processing cost and select a cost-effective component to contribute to product cost reduction and efficiency improvement.

[0055] The component conductivity rate is 100%, with no short circuit or wrong circuit phenomenon; the terminals are crimped firmly and the pulling force should meet the technical safety requirements.

[0056] The components have good appearance, without burrs, breakages or mechanical damage, etc. The overall appearance is beautiful and clearly marked.

[0057] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A double screw ear NTC temperature sensor assembly, characterized in that: Inside the 1U semi-bipolar power supply, the double-screw ear NTC temperature sensor assembly is reinforced with screws on the surfaces of the two power device heat sinks on the PWR power board under test; The double screw ear NTC temperature sensor assembly includes a screw ear terminal, and the thermistor is placed in the protective buckle of the screw ear terminal and potted with flexible epoxy resin; The two pins of the thermistor are led out by welding wires, and when the wires are bent, the bending radius of the wires is greater than 2 mm.

2. The double screw ear NTC temperature sensor assembly according to claim 1, characterized in that: The screw ear terminal is formed by stamping H62 brass, and the placement position of the thermistor is a rectangular three-sided buckle structure. The lead wire on the curing component side of the thermistor and the thermistor body are both located in the terminal rectangular buckle.

3. The double screw ear NTC temperature sensor assembly according to claim 2, characterized in that: The screw ear terminal is fixed to two radiator positions with three combination screws of M3*6, and the contact metal surface is tinned. The screw ear terminal is provided with a circular mounting hole with an inner diameter of φ3.2 and an outer diameter of φ7.

5.

4. The double screw ear type NTC temperature sensor assembly according to claim 3, characterized in that: The thermistor is an NTC thermistor.

5. The double screw ear type NTC temperature sensor assembly according to claim 4, characterized in that: The ends of the two thermistors are provided with three sections of black single-arm heat shrink tubing with a length of 20 mm and an interval of 20 mm. After the wiring harness is gathered into a bundle, it is connected to an A1008H-4P plug.

6. The double screw ear type NTC temperature sensor assembly according to claim 5, characterized in that: The A1008H-4P plug of the double screw ear type NTC temperature sensor assembly is connected to the A1008-4P socket of the main control board CN30.

7. The double screw ear type NTC temperature sensor assembly according to claim 6, characterized in that: The two thermistors of the double-screw ear NTC temperature sensor assembly measure the temperature of the two radiators inside the power supply in real time and accurately, and transmit the collected temperature data to the MCU microcontroller of the main control board for calculation and processing through the A / D analog-to-digital signal converter, and output the PWR control signal to control the speed of the two fans in the system, which can ensure the normal operation of the entire system circuit.

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