Resistance simulation device and temperature measurement calibration device

Abstract

The embodiment of the utility model provides a resistance simulation device and a temperature measurement calibration device, and belongs to the field of electrical technology. The resistance simulation device comprises a controller, a plurality of resistors connected in series and a plurality of relays, and each of the relays is connected with one of the resistors in parallel; the resistance values of the plurality of resistors are known; the controller controls the relays to be switched off or switched on, the relays in the switched-on state are short-circuited to the corresponding resistors, and the analog resistor is the sum of the resistance values of the resistors corresponding to the relays in the switched-off state. The resistance simulation device provided by the utility model can quickly obtain the resistance value of the simulation resistor without collecting and reading any resistance value.

Description

Technical Field

[0001] This utility model relates to the field of computer technology, specifically to a resistance simulation device and a temperature calibration device. Background Technology

[0002] In many scenarios, a desired simulated resistance is required, and this simulated resistance needs to change according to environmental or operating conditions. However, current technologies struggle to automatically adjust the resistance value of a variable resistor to meet the desired simulated resistance. Therefore, a resistor simulation device is needed that can quickly and accurately determine the resistance value of the simulated resistor. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a resistance simulation device that can quickly and accurately determine the resistance value of a simulated resistor.

[0004] To achieve the above objectives, this utility model provides a resistance simulation device, comprising: a controller, multiple resistors connected in series, and multiple relays, wherein...

[0005] Each of the multiple relays is connected in parallel with one of the multiple resistors;

[0006] The resistance values ​​of all resistors are known.

[0007] The controller controls multiple relays to open or close, causing the relays in the closed state to short-circuit their corresponding resistors. The simulated resistance is the sum of the resistance values ​​of the relays in the open state.

[0008] Optionally, the number of multiple relays is N, and the number of multiple resistors is N+1, where N is an integer greater than 2.

[0009] Furthermore, the multiple resistors include a base resistor and N regulating resistors, wherein each of the multiple relays is connected in parallel with one of the N regulating resistors.

[0010] Optionally, the controller can independently control each relay to open or close.

[0011] Optionally, the controller is a microcontroller.

[0012] Optionally, multiple resistors can be integrated resistors with different resistance values.

[0013] On the other hand, this utility model embodiment also provides a temperature measurement calibration device for calibrating the temperature resistance table of a temperature sensing element, including the resistance simulation device of this application, which controls the closing state of multiple relays through a controller so that the simulated resistance is equivalent to the resistance of the temperature sensing element being calibrated under multiple known temperature conditions.

[0014] Optionally, the temperature sensing element can be a resistance temperature detector (RTD) or a thermocouple.

[0015] Optionally, multiple known temperature values ​​can be determined based on a temperature resistance table of the temperature sensing element.

[0016] Optionally, the resistance values ​​of multiple resistors can be determined based on a temperature resistance table for the temperature sensing element.

[0017] Through the above technical solution, multiple resistors with known resistance values ​​are connected in series, and multiple relays are connected in parallel with their corresponding resistors so that when the relays are closed, they can short-circuit the corresponding resistors. By controlling the multiple relays to open or close through the controller, when the resistance values ​​of multiple resistors are known, the resistance value of the simulated resistor can be quickly obtained without collecting and reading any resistance values.

[0018] Other features and advantages of this utility model embodiment will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a circuit diagram of an embodiment of the resistance simulation device of this application;

[0021] Figure 2 This is a circuit diagram of an embodiment of the temperature measurement calibration device of this application.

[0022] Explanation of reference numerals in the attached figures

[0023] 1—Controller;

[0024] 2—Analog resistor output terminal;

[0025] 3—Temperature sensing element;

[0026] 4—Resistance simulation device. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0028] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are 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, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0029] This utility model provides a resistance simulation device. Figure 1 The circuit layout of the resistor simulation device is shown, where R0, R1, R2, ..., Rn are multiple resistors connected in series, and K1, K2, ..., Kn are relays connected in parallel with R1, R2, ..., Rn, respectively. Terminals DO1, DO2, ..., Don of controller 1 drive the coils of relays K1, K2, ..., Kn, thereby controlling the open or closed state of relays K1, K2, ..., Kn. When all K1, K2, ..., Kn are in the open state, the equivalent simulated resistance of the multiple resistors R0, R1, R2, ..., Rn is R0 + R1 + R2 + ... + Rn. When one or more of K1, K2, ..., Kn are in the closed state, the closed relay will short-circuit the corresponding resistor, making the equivalent simulated resistance of the multiple resistors R0, R1, R2, ..., Rn the sum of the resistance values ​​of the resistors corresponding to the open relays. In other words, for the resistor simulation device of this embodiment, when the resistance values ​​of the multiple resistors R0, R1, R2, ... Rn connected in series are all known, it is not necessary to measure the resistance value of any resistor. The current simulated resistance can be obtained by simply calculating the sum of the resistance values ​​of the resistors corresponding to the relays in the open state. Alternatively, when a specific simulated resistance is required, the controller 1 can control the open or closed state of the relays K1, K2, ... Kn so that the sum of the resistance values ​​of the resistors corresponding to the relays in the open state is the current required simulated resistance.

[0030] It should be noted that the minimum simulated resistance achievable by the resistance simulation device in this embodiment is R0, and the maximum simulated resistance is R0+R1+R2+......+Rn. The achievable simulated resistance is the sum of the resistances of any 0-n combinations of resistors selected from R0+R1, R2,......Rn. That is, in this embodiment, R0 is the basic resistance. However, this application does not necessarily require the inclusion of a basic resistance. When the required simulated resistance can be 0, the basic resistance may not be included, allowing each resistor in series to be short-circuited by the relay.

[0031] In this embodiment, controller 1 is a microcontroller that independently controls the opening or closing of each relay. However, this application is not limited to this. Technicians can set the control logic and select a suitable controller according to the resistance to be simulated.

[0032] In this embodiment, the multiple resistors R0, R1, R2, ... Rn connected in series are all integrated resistors with different resistance values, which reduces the resistance drift caused by temperature and ensures the stability of the output analog resistor.

[0033] It should also be noted that in actual scenarios where the resistance simulation device of this utility model is used, it is usually necessary to power the controller and apply voltage to the multiple resistors R0, R1, R2, ... Rn connected in series. This embodiment only provides an example of how to obtain a portion of the current of the simulated resistor. Technicians can set the power supply and other accessories according to the application scenario.

[0034] Compared to existing technologies, the technical advantages of this embodiment are as follows:

[0035] 1. When the resistance values ​​of multiple resistors R0, R1, R2, ... Rn connected in series are known, it is not necessary to measure the resistance value of any resistor. The current analog resistance can be determined by calculating the sum of the resistance values ​​of the resistors corresponding to the relays in the open state.

[0036] 2. When using the resistance simulation device of this embodiment for temperature measurement calibration of the temperature sensing element, do not measure the resistance value of any resistor. This avoids measurement errors from the measuring device itself, as well as errors caused by ambient temperature fluctuations during the measurement and reading of resistance values.

[0037] 3. When using the resistor simulation device of this embodiment to obtain the required simulated resistor, it is only necessary to set the resistance values ​​of multiple resistors R0, R1, R2, ... Rn connected in series. The microcontroller independently controls each relay to open or close, thereby controlling the effectiveness or ineffectiveness of each resistor with a different resistance value in the series resistors. A simulated resistor can be obtained by arbitrarily selecting 0 to n+1 resistor combinations.

[0038] 4. The series resistor uses an integrated resistor, which can reduce the resistance drift caused by temperature and ensure the stability of the output analog resistor.

[0039] This utility model embodiment provides a temperature measurement calibration device. Figure 2 The circuit layout of the temperature measurement calibration device is shown. Figure 1 In the illustrated embodiment, the analog resistance output terminal of the resistance simulation device 4 is connected across the two ends of the temperature sensing element 3. A current monitoring device of the same model is used to monitor I1 and I2. When I1 = I2, it indicates that the analog resistance output by the resistance simulation device is equivalent to the resistance of the calibrated temperature sensing element 3 at the current known temperature. A record of the current temperature value and the analog resistance value of the resistance simulation device 4 can be recorded in the temperature resistance table. Adjusting the current ambient temperature causes a change in the resistance of the temperature sensing element 3, and accordingly, the analog resistance of the resistance simulation device 4 is adjusted so that the output analog resistance is equivalent to the resistance of the calibrated temperature sensing element 3 at the new temperature. A record of the current temperature value and the analog resistance value of the resistance simulation device 4 is added to the temperature resistance table. The ambient temperature is continuously adjusted, and the above operation is repeated until the calibration requirements of the temperature resistance table are met.

[0040] It should be noted that this utility model does not limit the use of current monitoring equipment to monitor I1 and I2, and uses I1 = I2 to characterize the analog resistance output by the resistance simulation device as equivalent to the current resistance of the temperature sensing element 3. Technicians can use other known means to determine the multiple relationship between the analog resistance and the current resistance of the temperature sensing element 3, and can determine the current resistance of the temperature sensing element 3 by the multiple of the analog resistance as equivalent to the current resistance of the temperature sensing element 3.

[0041] In this embodiment, the temperature sensing element can be a resistance temperature detector (RTD) or a thermocouple. For example, the equivalent resistance value of PT100 under different ambient temperatures can be simulated using the resistance simulation device 4 of this application.

[0042] In some implementations, multiple known temperature values ​​are determined based on a temperature resistance table of the temperature sensing element. For example, when the temperature sensing element is PT100, the ambient temperature is controlled to be the typical temperature value of PT100, and the resistance value of PT100 at each typical temperature is calibrated.

[0043] In some implementations, the resistance values ​​of multiple resistors are determined based on a temperature resistance table of the temperature sensing element. For example, when the temperature sensing element is PT100, the resistance values ​​of multiple resistors connected in series in the resistance simulation device 4 are selected so that their simulated resistance values ​​match the resistance values ​​of PT100 in typical application scenarios, and the temperature value at which the resistance value of PT100 is equivalent to the simulated resistance of the resistance simulation device 4 is calibrated.

[0044] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A resistance simulation device, characterized in that, include: The controller consists of multiple resistors connected in series and multiple relays, among which... Each of the plurality of relays is connected in parallel with one of the plurality of resistors; The resistance values ​​of all the resistors are known. The controller controls the plurality of relays to open or close, causing the relays in the closed state to short-circuit the corresponding resistors, and the simulated resistance is the sum of the resistance values ​​of the relays in the open state.

2. The resistance simulation device according to claim 1, characterized in that, The number of relays is N, and the number of resistors is N+1, where N is an integer greater than 2.

3. The resistance simulation device according to claim 2, characterized in that, The plurality of resistors includes a base resistor and N regulating resistors, wherein each of the plurality of relays is connected in parallel with one of the N regulating resistors.

4. The resistance simulation device according to any one of claims 1 to 3, characterized in that, The controller independently controls each relay to open or close.

5. The resistance simulation device according to claim 4, characterized in that, The controller is a microcontroller.

6. The resistance simulation device according to claim 1, characterized in that, The plurality of resistors are integrated resistors with different resistance values.

7. A temperature calibration device for calibrating a temperature resistance meter of a temperature sensing element, characterized in that, The device includes a resistance simulation apparatus as described in any one of claims 1 to 6, wherein the controller controls the closing state of the plurality of relays such that the simulated resistance is equivalent to the resistance of the calibrated temperature sensing element under a plurality of known temperature conditions.

8. The temperature measurement calibration device according to claim 7, characterized in that, The temperature sensing element is a resistance temperature detector (RTD) or a thermocouple.

9. The temperature measurement calibration device according to claim 7, characterized in that, The values ​​of the plurality of known temperatures are determined according to the temperature resistance table of the temperature sensing element.

10. The temperature measurement calibration device according to claim 7, characterized in that, The resistance values ​​of the plurality of resistors are determined according to the temperature resistance value table of the temperature sensing element.

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