Adjustable resistance load box for calibration

Abstract

The utility model discloses an adjustable resistance load box used for calibration, comprising a housing, two sides of the housing are respectively provided with a front control panel and a rear control panel, the front control panel is provided with a first adjusting switch and a second adjusting switch, and the rear control panel is provided with a first wiring port, a second wiring port and a switch. A power input interface, an output wiring panel, a cooling fan, a power supply, a first power resistor and a second power resistor are installed in the shell, the first power resistor is electrically connected with the second adjusting switch, the second power resistor is electrically connected with the first adjusting switch, and the output wiring panel is connected with the first wiring port and the second wiring port. The power supply is connected with the switch through the power input interface, and the switch is electrically connected with the cooling fan. The product has the characteristics of ultrahigh precision, high stability, excellent heat dissipation effect and the like, a reliable and stable test environment is provided for users, and various calibration and test requirements are met.

Description

Technical Field

[0001] The utility model relates to the field of resistance load boxes, and specifically to an adjustable resistance load box for calibration. Background Art

[0002] Existing electronic load boxes are generally divided into two types, each with some characteristics and limitations: one is an electronic load box that uses electronic components such as MOS transistors (metal-oxide-semiconductor field effect transistors) to consume energy, thereby achieving high-precision load simulation. However, this method has a temperature drift problem because the characteristics of the components change with temperature. Although this problem can be alleviated by adding technologies such as temperature compensation, it will increase the manufacturing cost. The other is a pure resistance load box that uses adjustable resistors to simulate the load. Although this method is relatively simple and has a low cost, its repeatability is poor, and it is difficult to accurately locate the required load gear, especially when frequent adjustment is required, the efficiency is low.

[0003] The purpose of the utility model is to manufacture a resistance load box that not only has the performance of high precision and low temperature drift but also can effectively meet the positioning and adjustment requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an adjustable resistance load box for calibration to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An adjustable resistance load box for calibration, including a housing. On both sides of the housing, a front control panel and a rear control panel are respectively arranged. On the front control panel, a first adjustment switch and a second adjustment switch are arranged. On the rear control panel, a first wiring port, a second wiring port, and a switch are arranged. Inside the housing, a power input interface, an output wiring panel, a cooling fan, a power supply, a first power resistor, and a second power resistor are installed. The first power resistor is electrically connected to the second adjustment switch, the second power resistor is electrically connected to the first adjustment switch, the output wiring panel is respectively connected to the first wiring port and the second wiring port, the power supply is connected to the switch through the power input interface, and the switch is also electrically connected to the cooling fan.

[0007] Based on the above technical solutions, the utility model also provides the following optional technical solutions:

[0008] In an optional solution: a heat dissipation block is further installed at the bottom end of the housing, which can accelerate the heat dissipation effect of the whole device.

[0009] In an alternative solution: The first power resistor and the second power resistor are both mounted on the heat sink through fixing parts. The fixing parts can ensure good contact between the first power resistor and the second power resistor and the heat sink, guarantee the heat conduction effect, effectively transfer the heat generated by the first power resistor and the second power resistor to the heat sink, and maintain the stable performance of the device. Secondly, through this design, not only can the heat sink, the first power resistor and the second power resistor be fixed, but also the structure of the whole device can be ensured to be stable and reliable. This structural design enables the device to remain stable during long-term use and reduces the risk of failures caused by vibration or movement.

[0010] In an alternative solution: The heat sink is made of aluminum material, which is easy to obtain raw materials, convenient to manufacture, and has good heat dissipation effect.

[0011] In an alternative solution: Heat dissipation grooves are provided at the bottom of the outer shell, further enhancing the heat dissipation effect.

[0012] In an alternative solution: Both the first power resistor and the second power resistor adopt gold aluminum shell resistors with an accuracy of 0.5%, which are easily available in the market and have good heat dissipation effect.

[0013] In an alternative solution: The number of the first power resistors is 2, and the number of the second power resistors is 20. Since the resistance values of the first power resistor and the second power resistor are different, they can meet different resistance value settings when combined.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The adjustable resistor load box for calibration can meet people's usage requirements and can solve the temperature drift problem: By adopting gold aluminum shell resistors and optimized heat dissipation design, this product effectively solves the temperature drift problem existing in traditional resistor load boxes. Heat dissipation devices such as heat dissipation grooves, highly heat-conductive heat sinks and heat dissipation fans ensure that the resistors can work stably under different working conditions, and the influence of temperature drift is significantly reduced;

[0016] Improve repeatability: By adopting high-precision gold aluminum shell resistors and precise adjusting devices, this product realizes the ultra-high precision and stability of the resistor load box, makes the test results more consistent and reliable, and improves the repeatability;

[0017] Precise gear control: This product uses a single-pole double-throw switch to connect the power resistor groups in series and is equipped with a gear control switch. Users can accurately select the required test gear according to needs. The operation is simple, and it can effectively locate the required gear value, improving the convenience and flexibility of operation;

[0018] Ultra-high-precision testing ability: This product selects high-precision resistors with an accuracy of 0.5%, and through measuring and compensating each channel and range, it ensures that the accuracy of the entire system reaches an ultra-high level. Users can trust the test results provided by this load box, meeting application scenarios with extremely high requirements for test accuracy. Description of the Drawings

[0019] Figure 1 It is the first internal view of the adjustable resistor load box for calibration.

[0020] Figure 2 It is the second internal view of the adjustable resistor load box for calibration.

[0021] Figure 3 It is the first side view of the adjustable resistor load box for calibration.

[0022] Figure 4 It is the second side view of the adjustable resistor load box for calibration.

[0023] Figure 5 It is the first circuit connection diagram of the adjustable resistor load box for calibration.

[0024] Figure 6 It is the second circuit connection diagram of the adjustable resistor load box for calibration.

[0025] Figure 7 It is the third circuit connection diagram of the adjustable resistor load box for calibration.

[0026] Figure 8 It is the fourth circuit connection diagram of the adjustable resistor load box for calibration.

[0027] Annotation of reference numerals in the drawings: 1 - First power resistor, 2 - Second power resistor, 3 - Power supply, 4 - First adjustment switch, 5 - Second adjustment switch, 6 - Power input interface, 7 - Output wiring panel, 8 - Front control panel, 9 - Cooling fan, 10 - Rear control panel, 11 - Heat sink, 12 - Outer shell, 13 - First wiring port, 14 - Second wiring port, 15 - Switch. Detailed implementation manners

[0028] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments; in the drawings or descriptions, similar or identical parts use the same reference numerals, and in actual applications, the shapes, thicknesses or heights of each component can be enlarged or reduced. The embodiments listed in the present utility model are only used to illustrate the present utility model and are not used to limit the scope of the present utility model. Any obvious modification or change made to the present utility model does not depart from the spirit and scope of the present utility model.

[0029] In one embodiment, as Figures 1-8 shown, an adjustable resistor load box for calibration includes a housing 12. On both sides of the housing 12, a front control panel 8 and a rear control panel 10 are respectively provided. A first adjustment switch 4 and a second adjustment switch 5 are provided on the front control panel 8. A first wiring port 13, a second wiring port 14 and a switch 15 are provided on the rear control panel 10. Inside the housing 12, a power input interface 6, an output wiring panel 7, a cooling fan 9, a power supply 3, a first power resistor 1 and a second power resistor 2 are installed. The first power resistor 1 is electrically connected to the second adjustment switch 5, and the second power resistor 2 is electrically connected to the first adjustment switch 4. The output wiring panel 7 is respectively connected to the first wiring port 13 and the second wiring port 14. The power supply 3 is connected to the switch 15 through the power input interface 6, and the switch 15 is also electrically connected to the cooling fan 9. Preferably, the first power resistor 1 uses a 250W, 10Ω power resistor, the second power resistor 2 uses a 25W, 1Ω power resistor, the power supply 3 uses a 24V power supply module. The output wiring panel 7 is divided into four connection areas: CH1-H, CH1-L, CH2-H and CH2-L. The front control panel 8 is designed with two gear control areas, namely 01~20Ω and 10~20Ω. The functions of the two areas can work simultaneously and are independent of each other. Both the first wiring port 13 and the second wiring port 14 have positive wiring ports on the upper side and negative wiring ports on the lower side. The device under test is connected to the first power resistor 1 and the second power resistor 2 corresponding to the first adjustment switch 4 and the second adjustment switch 5 in the area of the front control panel 8 through the output wiring panel 7. This product is designed with two channels, namely (CH1-1Ω~20Ω, CH2-10Ω / 20Ω). These two groups of channels can be used independently or combined by external series connection, so that the maximum power of the whole system can reach 1000W. This design is flexible and diverse, can meet different test requirements, and improves the use range and applicability of the device. Before starting the instrument, first connect and power on at the rear control panel 10, turn on the switch 15. Do not block the cooling fan 9 during operation. Select the gear to be tested for connection, and select the appropriate adjustment switch on the front control panel 8 according to needs, then the test can be carried out.

[0030] In one embodiment, as Figures 3-4As shown, a heat dissipation block 11 is also installed at the bottom end of the outer shell 12, which can accelerate the heat dissipation effect of the entire device, ensure the rapid heat dissipation of the first power resistor 1 and the second power resistor 2. Preferably, the first power resistor 1 and the second power resistor 2 are installed at the bottom of the outer shell 12 and fixed to the heat dissipation block 11 by screws. There are two advantages to this design: First, by fixing the power resistor to the heat dissipation block 11, good contact between the power resistor and the heat dissipation block 11 can be ensured, promoting heat conduction. The screw fixation makes the power resistor and the heat dissipation block 11 closely connected, effectively transferring the heat generated by the power resistor to the heat dissipation block 11 and maintaining the stable performance of the device. Second, through this design, not only can the heat dissipation block 11 and the resistor assembly be fixed, but also the structure of the entire resistor load box can be ensured to be stable and reliable. This structural design enables the device to remain stable during long-term use and reduces the risk of failures caused by vibration or movement.

[0031] In one embodiment, as Figures 3-4 shown, the heat dissipation block 11 is made of aluminum material, which is easy to obtain raw materials, convenient to manufacture, and has good heat dissipation effect.

[0032] In one embodiment, as Figures 1-2 shown, heat dissipation grooves are provided at the bottom of the outer shell 12, further enhancing the heat dissipation effect.

[0033] In one embodiment, as Figures 1-2 shown, both the first power resistor 4 and the second power resistor 5 are gold aluminum shell resistors with an accuracy of 0.5%, which are easily available in the market and have good heat dissipation effect. The number of the first power resistors 4 is 2, and the number of the second power resistors 5 is 20. Since the resistance values of the first power resistor 4 and the second power resistor 5 are different, they can meet different resistance value settings when combined.

[0034] This product is designed with gold aluminum shell resistors as basic components. The exterior of the gold aluminum shell resistor is made of aluminum alloy (gold aluminum shell), which has many excellent characteristics. First, heat dissipation grooves are designed on the surface of the outer shell 12, which helps to improve the heat dissipation efficiency and maintain the stability of the device under long-term high-load working conditions. Second, due to the use of aluminum alloy material, the device is small in volume and large in power, and can meet the usage requirements under various space limitation conditions. In addition, the gold aluminum shell resistor has characteristics such as high temperature resistance, strong overload capacity, good weather resistance, high precision, and high stability, and is suitable for various harsh working environments.

[0035] This product also uses a single-pole double-blade adjustment switch to connect the power resistor groups in series and is equipped with a gear adjustment switch, making the operation very simple. Users can select a suitable adjustment switch according to their needs to achieve the desired test value. By closing or disconnecting the adjustment switch, the gear adjustment of the resistor can be realized, improving the flexibility and accuracy of the adjustment.

[0036] For the problem of overheating of the power resistor, this product adopts two combined heat dissipation methods, namely a cooling fan 9 with a super large air volume and a heat dissipation block 11 with high thermal conductivity. This design ensures good heat dissipation even under high current conditions, ensuring that the device can operate stably for a long time without being affected by overheating. The aluminum heat dissipation block 11 with high thermal conductivity not only facilitates heat dissipation but also reduces the center of gravity of the load box, enhancing the stability of the device.

[0037] In addition, this product selects 0.5% high-precision resistors, and through measurement and compensation for each channel and range, the accuracy of the entire system is guaranteed to reach an ultra-high level. The system structure is simple, stable and reliable, with low cost, and is suitable for various calibration and test requirements.

[0038] In summary, this product has the characteristics of ultra-high precision, strong stability, excellent heat dissipation effect, etc., providing users with a reliable and stable test environment and meeting various calibration and test requirements.

[0039] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An adjustable resistance load box for calibration, comprising a housing, a front control panel and a rear control panel are respectively arranged on both sides of the housing, the front control panel is provided with a first adjustment switch and a second adjustment switch, and the rear control panel is provided with a first wiring port, a second wiring port and a switch, characterized in that: A power input interface, an output wiring panel, a cooling fan, a power supply, a first power resistor and a second power resistor are installed inside the shell. The first power resistor is electrically connected to the second regulating switch, the second power resistor is electrically connected to the first regulating switch, the output wiring panel is connected to the first wiring port and the second wiring port respectively, the power supply is connected to the switch through the power input interface, and the switch is also electrically connected to the cooling fan.

2. The adjustable resistance load box for calibration according to claim 1, characterized in that: A heat sink is also installed at the bottom of the shell.

3. The adjustable resistance load box for calibration according to claim 2, characterized in that: The first power resistor and the second power resistor are both mounted on the heat sink through a fixing member.

4. The adjustable resistance load box for calibration according to claim 1, characterized in that: The first power resistor and the second power resistor are both gold aluminum shell resistors with a precision of 0.5%.

5. The adjustable resistance load box for calibration according to claim 1, characterized in that: The bottom of the shell is provided with a heat dissipation groove.

6. The adjustable resistance load box for calibration according to claim 1, characterized in that: The number of the first power resistors is 2, and the number of the second power resistors is 20.

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