Wide-range high-precision current acquisition circuit
By designing a wide range of high-precision current acquisition circuits, using the combination of carrier board modules and daughter board modules, rapid multi-speed switching and high-precision current measurement are achieved, solving the problems of limited measurement range and insufficient accuracy of traditional current acquisition boards, and improving the flexibility and reliability of real-time simulation systems.
Patent Information
- Application Number
- CN202411755612.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-03-11
AI Technical Summary
Traditional current acquisition boards have limited measurement range, poor measurement accuracy, and inconvenient switching of test current ranges, making it difficult to meet the needs of modern industrial control and testing fields for flexibility and accuracy.
A wide range of high-precision current acquisition circuit is designed. Through the combination of carrier board module and daughter board module, it supports the rapid switching of multiple gears. It uses Hall effect converters, operational amplifiers and other components to achieve high-precision acquisition in different current ranges.
It achieves stable and accurate current measurement results over the entire operating range, with the test accuracy of each gear reaching 0.5%, significantly improving the flexibility and reliability of the real-time simulation system.
Smart Images
Figure CN119595968A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of current acquisition, and in particular to a wide-range and high-precision current acquisition circuit. Background Art
[0002] In the field of modern industrial control and testing, real-time simulation technology is widely used in the development and verification of complex systems. This simulation tests the functions and performance of controllers by simulating the dynamic behavior of physical systems. It is especially suitable for industries such as automobiles and aerospace that have extremely high requirements for safety and reliability. In this test environment, accurate current signal acquisition is crucial to ensure the validity and accuracy of simulation results. Traditional current acquisition boards usually have limited measurement range, poor measurement accuracy, and inconvenient test current range switching.
[0003] To improve test flexibility and accuracy, a solution that can switch measurement ranges and maintain high accuracy is also needed. Summary of the invention
[0004] In view of this, the present application proposes a wide-range and high-precision current acquisition circuit.
[0005] This application is suitable for wide-range high-precision current acquisition in real-time simulation testing, supports rapid switching of multiple gears, and provides high-precision acquisition in different current ranges by switching gears. The test accuracy of each gear can reach 0.5%, thereby ensuring that stable and accurate current measurement results can be obtained throughout the entire working range. The current acquisition method and device based on this application not only expands the application scope of the current acquisition board, but also significantly improves the flexibility and reliability of the real-time simulation system, and is suitable for application scenarios of complex control system testing.
[0006] According to one aspect of the present application, a wide range and high precision current acquisition circuit is provided, comprising: a carrier module, a daughter board module;
[0007] The carrier module is provided with 6*3-position sockets;
[0008] The sub-board module is provided with a Hall effect converter, a first operational amplifier, and a second operational amplifier;
[0009] One end of the carrier module is connected to the power supply device, and the other end is connected to the Hall effect converter of the daughter board module through the gear socket;
[0010] The output end of the Hall effect converter is connected to the input end of the first operational amplifier;
[0011] The output terminal of the first operational amplifier is connected to the input terminal of the second operational amplifier.
[0012] In a possible implementation, one carrier module carries six sub-board modules, and each sub-board is inserted into one of three gear sockets of the carrier module.
[0013] In a possible implementation, the Hall effect converter is used to convert the collected current into a voltage and is connected to the carrier gear socket.
[0014] In a possible implementation, the first operational amplifier receives a voltage signal and amplifies the voltage signal by a preset multiple.
[0015] In a possible implementation manner, the second operational amplifier receives the amplified voltage signal output by the first operational amplifier.
[0016] In a possible implementation, the gear socket has a corresponding gear silk screen on the carrier board for identifying gear information.
[0017] In a possible implementation, different types of carrier gear sockets have different internal wiring methods.
[0018] In a possible implementation, the first operational amplifier further includes two replaceable resistance elements, and the preset amplification factor is determined according to the resistance values of the resistance elements.
[0019] In a possible implementation, the second operational amplifier further includes a transient suppression diode for protecting the wide-range high-precision current acquisition circuit.
[0020] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.
[0022] Figure 1 A structural diagram showing a wide range and high precision current acquisition circuit according to an embodiment of the present application;
[0023] Figure 2 A schematic diagram showing the corresponding relationship between the carrier board and the sub-board in an embodiment of the present application;
[0024] Figure 3 A circuit diagram of a daughter board according to an embodiment of the present application is shown. DETAILED DESCRIPTION
[0025] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.
[0026] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0028] In order to better illustrate the present application, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
[0029] Example 1
[0030] Figure 1 FIG. 2 shows a circuit structure diagram of a wide range and high precision current acquisition circuit according to an embodiment of the present application. Figure 1 As shown, the circuit includes a carrier module and a daughter board module: one end of the carrier module is connected to the power supply device, and the other end is connected to the Hall effect converter of the daughter board module through the gear socket; the output end of the Hall effect converter is connected to the input end of the first operational amplifier; the output end of the first operational amplifier is connected to the input end of the second operational amplifier.
[0031] Figure 2 FIG. 1 is a schematic diagram showing the corresponding relationship between the carrier board and the sub-board according to an embodiment of the present application. Figure 2 As shown, the circuit consists of a carrier board and six daughter boards, each daughter board supports three gears.
[0032] In a possible implementation, one carrier module carries six sub-board modules, and each sub-board is inserted into one of the three gear sockets of the carrier module. There are 6*3 sockets on the carrier, that is, there are three different gear sockets for each sub-board to choose from, and the internal wiring of the sockets of different gears is different. The sub-board is inserted into the socket of the corresponding gear to achieve high-precision acquisition of different current ranges.
[0033] And for each daughter board there is a Hall effect converter, a first operational amplifier and a second operational amplifier.
[0034] In a possible implementation, the Hall effect converter LA25-NP is used to convert the collected current into voltage and is connected to the carrier gear socket. The daughter board is inserted into the corresponding gear socket, the input end of the Hall effect converter is connected to the device to be detected, and the output end is connected to the first operational amplifier to collect current and convert the current signal into a voltage signal.
[0035] In a possible implementation, the first operational amplifier receives a voltage signal and amplifies the voltage signal by a preset multiple. In the present application, the first operational amplifier is a low-power precision instrumentation amplifier INA128U, which amplifies the voltage signal output by the Hall effect converter to a preset multiple.
[0036] In a possible implementation, the second operational amplifier receives the amplified voltage signal output by the first operational amplifier. In the present application, the second operational amplifier is a dual-channel operational amplifier AD712, whose input end is connected to the output end of the first operational amplifier, and is used to enhance the driving capability of the voltage signal output by the first operational amplifier, thereby enhancing the anti-interference capability and propagation distance of the analog voltage signal.
[0037] The electronic components used in the first operational amplifier and the second operational amplifier in the wide-range high-precision current acquisition circuit of the present application can be optimized and adjusted according to the actual application scenario.
[0038] In a possible implementation, the gear socket has a corresponding gear silk screen on the carrier board for identifying the gear information. The gear silk screen is printed on the carrier board to identify the gear parameters of different gear sockets, which is convenient to operate and not prone to errors when inserting the sub-board.
[0039] In a possible implementation, different types of carrier gear sockets have different internal wiring modes. When the gear sockets have different internal wiring modes, the connection mode of the pins of the Hall effect converter changes accordingly when the daughter board is inserted, thereby changing the current measurement range.
[0040] In a possible implementation, the first operational amplifier further includes two replaceable resistor elements, and the preset amplification factor is determined according to the resistance values of the resistor elements. The resistor elements are connected in parallel with the second operational amplifier, and the resistor elements can be changed to resistor elements of other resistance values, and the amplification factor is determined by changing the resistance values of the resistor elements.
[0041] In a possible implementation, the second operational amplifier further includes a transient suppression diode for protecting the wide-range high-precision current acquisition circuit. The transient suppression diode is a voltage-limiting overvoltage protection device, which is connected in series with the second operational amplifier to limit the voltage within a safe range and to suppress instantaneous overvoltage.
[0042] Further, such as Figure 3 As shown, it is a circuit diagram of a specific embodiment of the present scheme. In this embodiment, IC1 corresponds to the Hall effect converter (LA25-NP), and P1 and P2 are both single-row 8-pin connectors. The 1-5 pins corresponding to IC1 are respectively connected to the 4-8 pins of P1, and the 6-10 pins corresponding to IC1 are respectively connected to the 4-8 pins of P2. In the whole circuit, IC1 is used to collect current, with pin 1 of IC1 as the current input pin and pin 6 as the current output pin. The range of current collection can be changed by adjusting the wiring method of pins 1-10. Pin 11 of IC1 is a voltage output signal, which is connected to resistor R1 and output to pin 3 of IC2. Pins 12 and 13 are powered by ±15v. P3 is connected to both ends of resistor R2. When a jumper is inserted on P3, R2 is short-circuited and the output voltage at the M end is not amplified. When there is no jumper on P3, R2 and R3 work normally, and the output voltage signal will be amplified twice.
[0043] Pin 1 of P1 is suspended, and pins 2 and 3 are connected to ±15v power supply respectively. Pin 1 of P2 is the amplification enable pin of IC2. When pins 2 and 3 of P5 are short-circuited, IC2 amplifies the voltage value converted and output by IC1, otherwise it does not amplify. Pin P2 is the output voltage, and the input current value is converted according to the output voltage value.
[0044] IC2 corresponds to the first operational amplifier (INA128U), which is mainly used to amplify the voltage signal output by IC1. The amplification factor is determined by changing the resistance values of the resistors R5 and R6 connected in parallel between pins 1 and 8 to adapt to different test conditions. Pins 7 and 4 of IC2 are connected to ±15v power supplies to power IC2. Pin 2 is connected to resistor R4, and the other end of R4 is grounded. Pin 3 is used to receive the voltage signal output by IC. If the input level is high, the amplification is turned on, and if it is grounded, the amplification is turned off. The level control is achieved by shorting pins 2 and 3 or pins 1 and 2 through P5, and the short connection is high.
[0045] The circuit is also provided with an AD conversion unit IC3, which corresponds to the second operational amplifier (AD712) and is used to enhance the driving capability of the voltage signal output by IC2, thereby enhancing the anti-interference capability and propagation distance of the analog voltage signal. The voltage signal output by IC2 is input to the 3-pin of IC3, and a resistor R7 is connected in the middle. A transient suppression diode is connected to each of the 1 and 2 pins of IC3 to suppress the transient voltage to protect the circuit.
[0046] Pins 8 and 4 are connected to ±15V power supply, and pin 5 is grounded. Considering that only one output pin is needed in the circuit, pins 6 and 7 are short-circuited. Pin 1 is a signal output, and a voltage signal is output through resistors R11 and R12 to complete the current data acquisition based on the wide range and high precision current acquisition circuit of this application.
[0047] It should be noted that capacitors C1, C2, C9, C10, C11, and C12 are all filter capacitors, one end of which is connected to the power supply and the other end is grounded, which is used to reduce fluctuations and make the voltage input uniform. The resistance value of 0 in the circuit also means that the resistance here can be adjusted according to the actual connection situation.
[0048] Among them, the daughter board is connected to the sockets of different gears on the carrier board, and the connection method of the 1-10 pins of IC1 is changed by the different internal wiring of the gear socket to achieve current collection in different ranges.
[0049] In one possible implementation, the gear position can be divided into five optional parameters according to different wiring methods, and three different parameter specifications can be selected from the five parameter specifications of 5A, 6A, 8A, 12A, and 25A as the three-speed socket on the carrier board according to the current collection requirements during actual implementation.
[0050] Specifically, adjust the pin wiring method, 5A gear: use pin 1 of IC1 as the current input pin, pin 6 as the current output pin, and short-circuit pins 5, 7; 4, 8; 3, 9; 2, 10 in pairs respectively. At this time, the gear input current = output voltage / 2.
[0051] In the 6A gear, use pin 1 of IC1 as the current input pin and pin 6 as the current output pin. Short-circuit pins 5, 7, 8; 3, 4, 9; 2, 10 respectively. In this gear, the input current = output voltage / 1.6.
[0052] 8A gear: Use pin 1 of IC1 as current input pin and pin 6 as current output pin, short-circuit pins 5, 4, 8; 3, 9, 10; 1, 2; 6, 7 respectively. At this time, the gear input current = output voltage / 1.2.
[0053] In the 12A gear, use pin 1 of IC1 as the current input pin and pin 6 as the current output pin. Short-circuit pins 1, 2, 3; 4, 5, 8, 9, 10; 6, 7 respectively. In this gear, the input current = output voltage / 0.8.
[0054] 25A gear: Use pin 1 of IC1 as the current input pin and pin 6 as the current output pin. Short-circuit pins 1, 2, 3, 4, and 5, and short-circuit pins 6, 7, 8, 9, and 10. At this time, the gear input current = output voltage / 0.4.
[0055] When the daughter board is inserted into the socket of the corresponding gear on the carrier board, the wiring on the board of the sockets of different gears is different. The pins of the daughter board IC1 are connected according to the corresponding preset method to complete the gear switching.
[0056] By switching different gears, the problem of limited measurement range or insufficient accuracy of previous current acquisition boards is solved. Based on the wide-range and high-precision current acquisition circuit of this application, the switching can be completed by simply inserting the sub-board into the socket of the corresponding gear on the carrier board. The operation is simple, avoiding the cumbersome operation of conventional circuit acquisition while reducing the introduction of errors.
[0057] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A wide range and high precision current acquisition circuit, characterized in that: include: Carrier board module, daughter board module; The carrier module is provided with 6*3-position sockets; The sub-board module is provided with a Hall effect converter, a first operational amplifier, and a second operational amplifier; One end of the carrier module is connected to the power supply device, and the other end is connected to the Hall effect converter of the daughter board module through the gear socket; The output end of the Hall effect converter is connected to the input end of the first operational amplifier; The output terminal of the first operational amplifier is connected to the input terminal of the second operational amplifier.
2. The wide range and high precision current acquisition circuit according to claim 1, characterized in that: One carrier module carries six sub-board modules, and each sub-board is inserted into one of the three gear sockets of the carrier module.
3. The wide range and high precision current acquisition circuit according to claim 1, characterized in that: The Hall effect converter is used to convert the collected current into voltage and is connected to the carrier board gear socket.
4. The wide range and high precision current acquisition circuit according to claim 1, characterized in that: The first operational amplifier receives a voltage signal and amplifies the voltage signal by a preset multiple.
5. The wide range and high precision current acquisition circuit according to claim 1, characterized in that: The second operational amplifier receives the amplified voltage signal output by the first operational amplifier.
6. The wide range and high precision current acquisition circuit according to claim 2, characterized in that: The gear socket has a corresponding gear silk screen on the carrier board for identifying the gear information.
7. The wide range and high precision current acquisition circuit according to claim 2, characterized in that: Different types of carrier board gear sockets have different internal wiring methods.
8. The wide range and high precision current acquisition circuit according to claim 3, characterized in that: The first operational amplifier also includes two replaceable resistor elements, and the preset amplification factor is determined according to the resistance values of the resistor elements.
9. The wide range and high precision current acquisition circuit according to claim 5, characterized in that: The second operational amplifier also includes a transient suppression diode for protecting the wide-range high-precision current acquisition circuit.