Discrete calibration device of multi-board cascade system
By introducing a signal conversion board and a main control board into a multi-board cascade system and configuring a memory to store calibration parameters, the problems of cumbersome calibration operations and poor compatibility caused by the binding relationship of single boards are solved, and the arbitrary replacement of single boards and improvement of measurement accuracy are achieved, simplifying the production process.
Patent Information
- Application Number
- CN202421309873.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-06-11
AI Technical Summary
In existing multi-board cascade systems, the binding relationship between single boards leads to cumbersome calibration operations, poor compatibility, and low measurement accuracy, making it difficult to achieve arbitrary replacement of single boards and simplify the production process.
A signal conversion board and a main control board are used, and a memory storage system and discrete calibration parameters are configured to achieve single-board calibration without the need for system recalibration. Through the cooperation of the signal conversion board and the main control board, the system measurement accuracy requirements are met.
It realizes the arbitrary replacement of single boards, simplifies the production process of the whole system, improves the measurement accuracy and production efficiency, and there is no binding relationship between the single board and the system.
Smart Images
Figure CN223333148U_ABST
Abstract
Description
Technical Field
[0001] The utility model is applied to the technical field of multi-board cascade systems, and particularly relates to a discrete calibration device for the multi-board cascade system. Background Art
[0002] The multi-board cascade system is a relatively complex test system that requires multiple functional boards to be interconnected to complete the overall functional test. The test system includes the electronic control board, main control board, power supply board, and analog processing board.
[0003] System calibration refers to the fact that in a multi-board cascade system, the transmission of an analog signal must pass through multiple boards before it can be used in the system. The analog signal must be calibrated with different resistance and capacitance parameters on different boards, so the analog value on a single circuit board needs to be calibrated. In a multi-board cascade system, the analog value will produce certain system errors after passing through different functional boards, so the analog value needs to be calibrated before it can be finally used.
[0004] In a multi-board cascade system, the accuracy and performance of the components on the circuit boards vary, so each analog input and output will have different system errors. In a test system composed of different circuit boards, the system errors of the analog quantities are different. If it is necessary to improve the accuracy of the analog quantities measured in the system application, it is necessary to calibrate the analog quantities of each input and output with a standard instrument. Generally, the analog quantities of the system input need to be calibrated in the end to meet the measurement accuracy. However, in order to facilitate the production and inspection of single boards, the analog quantity calibration of the single board is also required. After the replacement of different single boards is completed, the system calibration needs to be performed again to meet the measurement accuracy. That is, each test system has a one-to-one binding relationship with the single board. Obviously, the compatibility of this calibration solution is poor and the operation is cumbersome. Therefore, it is necessary to provide a discrete calibration device for a multi-board cascade system with good compatibility, high measurement accuracy, arbitrary replacement of single boards, simplified production process of the entire system, and no binding relationship between single boards and the system. Utility Model Content
[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a discrete calibration device for a multi-board cascade system with good compatibility, high measurement accuracy, arbitrary replacement of single boards, ability to simplify the production process of the entire system, and no binding relationship between single boards and the system.
[0006] The technical solution adopted by the present invention is: the present invention includes a signal conversion board, discrete devices and several main control boards, the main control board is configured with a first memory and a processor, the signal conversion board is connected to an external tester, each channel of the signal conversion board is configured with a second memory, the first memory stores the calibration coefficients and parameters of the system calibration, the second memory stores the calibration parameters of the discrete calibration, and the calibration parameters corresponding to the second memory store the calibration data of the discrete devices.
[0007] It can be seen from the above scheme that after the present application calibrates each single board, the combined measurement still meets the system measurement accuracy, the single boards can be replaced at will, the single board and the system do not have a binding relationship, and there is no need to calibrate the system again after replacing the single board, thereby simplifying the production process of the entire system and improving production efficiency. In a multi-board cascade system, the calibration parameters of the discrete calibration are stored in the second memory corresponding to each channel respectively. The calibration parameters of the multi-board cascade system require that the calibration parameters of the discrete devices stored in the second memory need to be combined with the calibration parameters of the link corresponding to the first memory. If the accuracy requirement of the multi-board cascade system is A, it is necessary to ensure that the calibration accuracy on the signal conversion board and the main control board reaches A / 2, so as to meet the system accuracy requirements.
[0008] A preferred solution is that the signal conversion board is provided with a connector, and the main control board communicates with the signal conversion board via the connector.
[0009] A preferred solution is that the signal conversion board includes a sampling resistor, the main control board includes an MCU and an operational amplifier, one end of the sampling resistor is connected to the same-direction input terminal of the operational amplifier, the other end of the sampling resistor is connected to the reverse input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the MCU. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural diagram of the utility model;
[0011] Figure 2 This is an example diagram of the derivation of calibration coefficients of the present invention. DETAILED DESCRIPTION
[0012] like Figure 1As shown, in this embodiment, the utility model includes a signal conversion board 1, discrete devices 2 and several main control boards 3, the main control board 3 is configured with a first memory 4 and a processor 5, the signal conversion board 1 is connected to an external tester, and each channel of the signal conversion board 1 is configured with a second memory 6, the first memory 4 stores the calibration coefficients and parameters of the system calibration, the second memory 6 stores the calibration parameters of the discrete calibration, and the calibration parameters corresponding to the second memory 6 store the calibration data of the discrete device 2.
[0013] like Figure 1 As shown, in this embodiment, the signal conversion board 1 is provided with a connector 7 , and the main control board 3 communicates with the signal conversion board 1 through the connector 7 .
[0014] In this embodiment, the calibration coefficients and parameters of the system calibration are stored in the first memory 4 corresponding to each channel, and the calibration parameters of the discrete calibration are stored in the second memory 6 corresponding to each channel, and the calibration parameters corresponding to the second memory 6 only store the calibration data of the discrete device 2, and are not related to other parameters. During the overall analog data measurement process of the system, the calibration parameters stored in the second memory 6 need to be combined and calculated with the calibration parameters of the link corresponding to the first memory 4 to finally obtain the calibration parameters for the system operation.
[0015] like Figure 2 As shown, in this embodiment, the signal conversion board 1 includes a sampling resistor, the main control board 3 includes an MCU and an operational amplifier, one end of the sampling resistor is connected to the same-direction input terminal of the operational amplifier, the other end of the sampling resistor is connected to the reverse input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the MCU.
[0016] In this embodiment, assuming that the system accuracy requirement is A, it is necessary to ensure that the calibration accuracy of the signal conversion board 1 and the main control board 3 reaches A / 2, so as to meet the system accuracy requirement; wherein, the calibration of the analog quantity is divided into voltage calibration and current calibration based on the signal type; and is divided into single-ended calibration and differential calibration based on the link relationship. The voltage calibration is mainly due to the different corresponding voltage divider coefficients on the main control board 3 and the signal conversion board 1. Therefore, it is necessary to store the voltage divider coefficient G1 on the main control board 3, and also to output the voltage divider coefficient G2 on the signal conversion board 1. Then, the final calculation of the calibration coefficient of the analog quantity is K=G1*G2. If the sampling resistor and the conversion circuit of the current signal are separated, differential calibration is generally adopted, as shown in the example diagram. Figure 2 shown.
[0017] The calibration coefficient calculation for the differential current is as follows:
[0018] The input current is calculated with R as the sampling resistor and the operational amplifier amplification factor G=20. The actual measured current is Ii, the MCU display is Id, the differential calculation positive terminal voltage is Vp, and the negative terminal voltage is Vn. Assume that the coefficients in the MCU are Km and bm; the resistance coefficient stored in the WIB is Kw. Then Assume that Vpi and Vni are the voltages across the sampling resistor, and the resistance of the sampling resistor is R. From the above, we can obtain: The calibration coefficients after separation are calculable, which proves the feasibility of the discrete calibration method.
Claims
1. A discrete calibration device for a multi-board cascade system, characterized in that: It comprises a signal conversion board (1), discrete devices (2) and a plurality of main control boards (3), wherein the main control board (3) is configured with a first memory (4) and a processor (5), the signal conversion board (1) is connected to an external test machine, and each channel of the signal conversion board (1) is configured with a second memory (6), the first memory (4) stores calibration coefficients and parameters of system calibration, the second memory (6) stores calibration parameters of discrete calibration, and the calibration parameters corresponding to the second memory (6) store calibration data of the discrete devices (2).
2. The discrete calibration device for a multi-board cascade system according to claim 1, characterized in that: The signal conversion board (1) is provided with a connector (7), and the main control board (3) communicates with the signal conversion board (1) via the connector (7).
3. The discrete calibration device for a multi-board cascade system according to claim 1, characterized in that: The signal conversion board (1) includes a sampling resistor, and the main control board (3) includes an MCU and an operational amplifier. One end of the sampling resistor is connected to the same-direction input end of the operational amplifier, the other end of the sampling resistor is connected to the reverse input end of the operational amplifier, and the output end of the operational amplifier is connected to the MCU.