High-capacity temperature coefficient compensation resistor

Abstract

The utility model discloses a high-capacity temperature coefficient compensation resistor, which solves the problems that the existing high-capacity resistor is large in size, low in precision, easy to heat and high in cost due to the fact that the quality of the existing high-capacity resistor is improved by quantity. The device specifically comprises a resistor box, an air duct arranged in the resistor box, a main body resistor module arranged in the air duct, f adjusting and compensating resistor modules arranged in the air duct and connected to the two ends of the main body resistor module in parallel, and a fan arranged in the air duct and located at the bottoms of the main body resistor module and the f adjusting and compensating resistor modules. The measuring module is connected with the main body resistor module, the controller is respectively connected with the measuring module and the adjusting and compensating resistor module, and f is a positive integer greater than or equal to 1; the adjusting compensation resistor module comprises a plurality of compensation resistor units which are connected in parallel and is used for providing multi-gear adjustable resistance values for the main body resistor module; the compensation resistor unit comprises a circuit breaker, a contactor and a compensation resistor which are connected in sequence; the compensation resistor is a resistor from a hundred ohm level to a thousand ohm level.

Description

Technical Field

[0001] This utility model relates to resistors, specifically to a high-capacity temperature coefficient compensated resistor. Background Technology

[0002] High-capacity resistors are widely used in generator testing and evaluation, energy storage system testing and energy dissipation, electronic equipment performance testing, power system load testing, current balancing and voltage stabilization, radio frequency power testing, antenna load simulation, communication circuit protection, and are also used in various fields such as simulating specific loads or resistance values, analog chip loaders for testing the performance and accuracy of electronic equipment, and magnetic levitation flywheel energy storage converters.

[0003] In testing the performance of circuits in fields such as chip electronic devices or magnetic levitation flywheel energy storage converters, the requirements for resistors are often extremely high. Resistors need to possess characteristics such as large capacity, low resistance, high precision, high current resistance, and low resistance temperature variation. According to current technological approaches, it is necessary to increase the number of low-resistance, high-precision, and low-resistance-temperature-variability resistive elements to improve quality through quantity. This would undoubtedly increase the size and cost of resistors exponentially, hindering the large-scale market promotion of such products.

[0004] Therefore, there is an urgent need to provide a high-capacity temperature coefficient compensation resistor that has a small footprint, large capacity, high accuracy, and temperature drift compensation to meet market demands. Utility Model Content

[0005] To address the technical problems of large-capacity resistors being bulky, low-precision, prone to overheating, and costly when increasing quantity to improve quality, this invention provides a large-capacity temperature coefficient compensation resistor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-capacity temperature coefficient compensation resistor is characterized by comprising: a resistance box, an air duct disposed within the resistance box, a main resistance module disposed within the air duct, f adjustable compensation resistor modules disposed within the air duct and connected in parallel across the main resistance module, a fan disposed within the air duct and located at the bottom of the main resistance module and the f adjustable compensation resistor modules, a measurement module connected to the main resistance module, and a controller connected to the measurement module and the adjustable compensation resistor modules respectively, where f is a positive integer greater than or equal to 1;

[0008] The adjustable compensation resistor module includes multiple compensation resistor units connected in parallel to provide multiple adjustable resistance values ​​to the main resistor module; each compensation resistor unit includes a circuit breaker, a contactor, and a compensation resistor connected in sequence; the compensation resistor is a resistor in the range of hundreds of ohms to thousands of ohms.

[0009] The measurement module is used to measure the current and voltage values ​​of the main resistance module in real time;

[0010] The input terminal of the controller is connected to the output terminal of the measurement module, and its control terminal is connected to each of the circuit breakers and contactors respectively, for controlling the opening and closing of the circuit breakers and contactors according to the current value and voltage value of the main resistance module.

[0011] Furthermore, the measurement module includes a current transformer and a voltage transformer, which are respectively connected to the controller;

[0012] The current transformer is installed at the input terminal of the main resistor module;

[0013] The voltage transformer is connected in parallel to the input and output terminals of the main resistor module.

[0014] Furthermore, the adjustment compensation resistor module includes three modules: a coarse adjustment resistor module, a first-stage fine adjustment resistor module, and a second-stage fine adjustment resistor module.

[0015] The coarse adjustment resistor module includes n compensation resistor units connected in parallel to each other, which are used to provide the main resistor module with n 50mΩ coarse adjustment resistor values, where n is an integer greater than or equal to 2.

[0016] The first-level fine-tuning resistor module includes p compensation resistor units connected in parallel, which are used to provide the main resistor module with p-level 10mΩ fine-tuning resistor values, where p is an integer greater than or equal to 2.

[0017] The secondary fine-tuning resistor module includes k parallel compensation resistor units, which are used to provide the main resistor module with k fine-tuning resistor values ​​of 5mΩ, where k is an integer greater than or equal to 2.

[0018] Furthermore, the main resistor module includes s main resistor units connected in parallel;

[0019] The main resistor unit comprises m main resistors connected in series.

[0020] Furthermore, n = 5, k = 5, p = 5, m = 5, s = 5.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model provides a high-capacity temperature coefficient compensation resistor, which consists of a main resistor module connected in parallel with f adjustable compensation resistor modules controlled by a controller; the current and voltage values ​​of the main resistor module are measured by a measuring component and fed back to the controller; based on the acquired current and voltage values, the controller can flexibly control and adjust the compensation resistor modules to compensate for the resistance changes of the main resistor module caused by temperature coefficient and contact resistance of the circuit.

[0023] 2. In this utility model, the adjusting compensation resistor module includes multiple compensation resistor units connected in parallel. Each compensation resistor unit includes a circuit breaker, a contactor, and a compensation resistor connected in sequence. The compensation resistor is a resistor in the range of hundreds of ohms to thousands of ohms. In this way, the adjusting compensation resistor module shares a small current in the circuit, has low power, low heat generation, and requires a small current to match the control contactor. Therefore, the size of the large-capacity resistor is greatly reduced, the component cost is low, and the cost is low.

[0024] 3. The coarse adjustment resistor module, the first-level fine adjustment resistor module and the second-level fine adjustment resistor module in this utility model provide compensation resistor values ​​of 50mΩ for the n-level, 10mΩ for the p-level and 5mΩ for the k-level, realizing precise control of the main resistor in the circuit at low cost. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of a large-capacity temperature coefficient compensation resistor according to the present invention.

[0026] Icon labels:

[0027] 1-Resistor box, 2-Air duct, 3-Main resistor module, 31-Main resistor, 4-Fan, 5-Controller, 6-Adjustable compensation resistor module, 6.1-Circuit breaker, 6.2-Contactor, 6.3-Compensation resistor, 61-Coarse adjustment resistor module, 62-First-stage fine adjustment resistor module, 63-Second-stage fine adjustment resistor module, 7-Current transformer, 8-Voltage transformer. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This utility model provides a high-capacity temperature coefficient compensation resistor, such as... Figure 1 As shown, the resistor includes a resistor box 1, an air duct 2 disposed within the resistor box 1, a main resistor module 3 disposed within the air duct 2, three adjustable compensation resistor modules 6 disposed within the air duct 2 and connected in parallel across the two ends of the main resistor module 3, a fan 4 disposed within the air duct 2 and located at the bottom of the main resistor module 3 and the three adjustable compensation resistor modules 6, a measuring module connected to the main resistor module 3, and a controller 5 connected to the measuring module and the adjustable compensation resistor modules 6 respectively.

[0030] Resistor box 1 encapsulates all components, providing protection for each component.

[0031] The main resistor module 3 includes s main resistor units connected in parallel; the main resistor unit includes m main resistors 31 connected in series, where s and m are integers greater than or equal to 2.

[0032] The measurement module includes a current transformer 7 and a voltage transformer 8, which are respectively connected to the controller 5. The current transformer 7 is located at the input terminal of the main resistance module 3; the voltage transformer 8 is connected in parallel at both the input and output terminals of the main resistance module 3. The current transformer 7 and the voltage transformer 8 are used to measure the current and voltage values ​​in the circuit of the main resistance module 3 in real time and feed them back to the controller 5.

[0033] The three adjustment and compensation resistor modules 6 are a coarse adjustment resistor module 61, a first-stage fine adjustment resistor module 62, and a second-stage fine adjustment resistor module 63. These modules are all connected in parallel to the input and output terminals of the main resistor module 3. The coarse adjustment resistor module 61 comprises n parallel compensation resistor units, used to provide the main resistor module 3 with n levels of 50mΩ coarse adjustment resistance values, where n is a positive integer greater than or equal to 2. The first-stage fine adjustment resistor module 62 comprises p parallel compensation resistor units, used to provide the main resistor module 3 with p levels of 10mΩ fine adjustment resistance values, where p is a positive integer greater than or equal to 2. The second-stage fine adjustment resistor module 63 comprises k parallel compensation resistor units, used to provide the main resistor module 3 with k levels of 5mΩ fine adjustment resistance values, where k is a positive integer greater than or equal to 2. The compensation resistor units in the coarse adjustment resistor module 61, the first-stage fine adjustment resistor module 62, and the second-stage fine adjustment resistor module 63 respectively include a circuit breaker 6.1, a contactor 6.2, and a compensation resistor 6.3 connected in sequence; each compensation resistor 6.3 is a resistor in the range of hundreds of ohms to thousands of ohms; where n, p, and k are all positive integers greater than or equal to 2. The circuit breaker 6.1 and the contactor 6.2 are respectively connected to the control terminals of the controller 5. The controller 5 switches the corresponding circuit breaker 6.1 and contactor 6.2 based on the acquired voltage and current values, thereby compensating for the resistance value changes of the main resistor module 3 caused by the temperature coefficient.

[0034] The input terminal of controller 5 is connected to the output terminal of the measurement module, and its control terminals are connected to circuit breaker 6.1 and contactor 6.2 respectively. It is used to control the opening and closing of circuit breaker 6.1 and contactor 6.2 according to the current and voltage values ​​of the main resistor module 3. This controller is implemented using hardware circuitry.

[0035] The main resistor module 3, coarse adjustment resistor module 61, first-stage fine adjustment resistor module 62, and second-stage fine adjustment resistor module 63 are electrically connected in parallel. The main resistor module 3 can withstand large currents in the hundreds of amperes. The coarse adjustment resistor module 61, first-stage fine adjustment resistor module 62, and second-stage fine adjustment resistor module 63 provide current shunting in the ampere range. The coarse adjustment resistor module 61 provides 50mΩ resistance compensation, while the first-stage fine adjustment resistor module 62 and second-stage fine adjustment resistor module 63 provide 10mΩ and 5mΩ resistance compensation, respectively. By increasing or decreasing the number of first-stage fine adjustment resistor modules 62 and second-stage fine adjustment resistor modules 63, the resistance drift of the main resistor module 3 caused by temperature changes is compensated, thus enabling precise control of the resistance value of the main resistor module 3.

[0036] In this embodiment, n=5, k=5, p=5, m=5, s=5 are preferably selected, and the selection principle is as follows:

[0037] (1) When n=5, k=5, p=5, m=5, s=5, set R 1-1 =2Ω and R 1-1 =R 1-2 ···=R s-m At that time, the total resistance of the main resistor module (3) is: R = 8 / 4 = 2Ω. After five coarse adjustments of 50mΩ each with n = 5, the parameters are shown in the table below:

[0038]

[0039] (2) After five coarse adjustments, and five fine adjustments with a 10mΩ change of p=5, the parameters are obtained as shown in the table below:

[0040]

[0041] (3) After five fine-tuning operations, and after five fine-tuning operations with a change of 5mΩ for k=5, the parameters obtained from the fine-tuning compensation are shown in the table below:

[0042]

[0043]

[0044] The temperature coefficient of metallic resistive materials is a positive temperature coefficient, meaning that the resistance increases with increasing temperature. Therefore, by increasing the number of compensation resistors based on this principle, the effect of temperature on the resistance can be compensated within ±1%, effectively improving the reliability of system testing.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high volume temperature coefficient compensation resistor characterized by: The device comprises a resistance box (1), an air duct (2) arranged in the resistance box (1), a main resistance module (3) arranged in the air duct (2), f adjustment compensation resistance modules (6) arranged in the air duct (2) and connected in parallel to both ends of the main resistance module (3) respectively, a fan (4) arranged in the air duct (2) and located at the bottom of the main resistance module (3) and the f adjustment compensation resistance modules (6), a measurement module connected with the main resistance module (3), and a controller (5) connected with the measurement module and the adjustment compensation resistance modules (6) respectively, wherein f is a positive integer greater than or equal to 1; The adjustment compensation resistance module (6) comprises a plurality of compensation resistance units connected in parallel with each other, for providing a plurality of adjustable resistance values to the main resistance module (3); the compensation resistance unit comprises a circuit breaker (6.1), a contactor (6.2) and a compensation resistance (6.3) connected in sequence; the compensation resistance (6.3) is a resistance of 100 ohms to 1000 ohms; The measurement module is used for measuring the current value and the voltage value of the main resistance module (3) in real time; The input end of the controller (5) is connected with the output end of the measurement module, the control end thereof is connected with each of the circuit breaker (6.1) and the contactor (6.2), and the controller (5) is used for controlling the opening and closing of the circuit breaker (6.1) and the contactor (6.2) according to the current value and the voltage value of the main resistance module (3).

2. The high volume temperature coefficient compensation resistor of claim 1, wherein: The measurement module comprises a current transformer (7) and a voltage transformer (8) connected with the controller (5) respectively; The current transformer (7) is arranged at the incoming line end of the main resistance module (3); The voltage transformer (8) is connected in parallel to the incoming line end and the outgoing line end of the main resistance module (3).

3. The high-capacity temperature coefficient compensation resistor according to claim 1 or 2, characterized in that: The adjustment compensation resistance module (6) comprises three modules, namely a coarse adjustment resistance module (61), a first fine adjustment resistance module (62) and a second fine adjustment resistance module (63); The coarse adjustment resistance module (61) comprises n compensation resistance units connected in parallel with each other, for providing n coarse adjustment resistance values of 50 mΩ to the main resistance module (3), wherein n is an integer greater than or equal to 2; The first fine adjustment resistance module (62) comprises p compensation resistance units connected in parallel with each other, for providing p fine adjustment resistance values of 10 mΩ to the main resistance module (3), wherein p is an integer greater than or equal to 2; The second fine adjustment resistance module (63) comprises k compensation resistance units connected in parallel with each other, for providing k fine adjustment resistance values of 5 mΩ to the main resistance module (3), wherein k is an integer greater than or equal to 2.

4. The high volume temperature coefficient compensation resistor of claim 3, wherein: The main resistance module (3) comprises s main resistance units connected in parallel with each other; The main resistance unit comprises m main resistances (31) connected in sequence.

5. The large-capacity temperature coefficient compensation resistor according to claim 4, wherein n = 5, k = 5, p = 5, m = 5, and s = 5. ​

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