CN221572666U - Current detection system - Google Patents
Current detection system Download PDFInfo
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- CN221572666U CN221572666U CN202323475475.XU CN202323475475U CN221572666U CN 221572666 U CN221572666 U CN 221572666U CN 202323475475 U CN202323475475 U CN 202323475475U CN 221572666 U CN221572666 U CN 221572666U
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
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- 238000001914 filtration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the application discloses a current detection system, which comprises an amplifying circuit, a filter circuit and an analog-to-digital conversion circuit which are sequentially connected, wherein the amplifying circuit comprises an operational amplifier, a first resistor, a second resistor and a third resistor, the positive input end of the operational amplifier is connected with a current input end to be detected through the first resistor, the positive input end of the operational amplifier is connected with a power supply end through the second resistor, the negative input end of the operational amplifier is connected with a grounding end through the third resistor, the power supply positive input end of the operational amplifier is connected with the power supply end, the power supply negative input end of the operational amplifier is connected with the grounding end, the output end of the operational amplifier is connected with the filter circuit, and the analog-to-digital conversion circuit is connected with the current output end; the method realizes weak current acquisition, corresponding amplification and rapid processing, improves the precision and sensitivity of current detection, does not need a complex current detection device, and improves the detection speed of current.
Description
Technical Field
The embodiment of the application relates to the technical field of current detection, in particular to a current detection system.
Background
In applications such as power management, motor control, battery valve control, etc., it is often necessary to detect current in real time and calculate the remaining power, wherein many circuit modules involve the amplification and detection of weak current signals.
At present, a great deal of fields have higher and higher requirements on the sensitivity, the accuracy, the sampling frequency and the detection range of weak current signal amplification and detection, and the existing weak current detection device has the problem that the high speed, the high accuracy and the high sensitivity cannot be considered.
Disclosure of utility model
The embodiment of the application provides a current detection system, which aims to solve the problem that the existing weak current detection device cannot achieve high speed, high accuracy and high sensitivity.
In a first aspect, an embodiment of the present application provides a current detection system, including an amplifying circuit, a filter circuit and an analog-to-digital conversion circuit that are sequentially connected, where the amplifying circuit includes an operational amplifier, a first resistor, a second resistor and a third resistor, a positive input end of the operational amplifier is connected to an input end of a current to be detected through the first resistor, a positive input end of the operational amplifier is connected to a power supply end through the second resistor, a negative input end of the operational amplifier is connected to a ground end through the third resistor, a power supply positive input end of the operational amplifier is connected to a power supply end, a power supply negative input end of the operational amplifier is connected to a ground end, an output end of the operational amplifier is connected to the filter circuit, and the analog-to-digital conversion circuit is connected to a current output end.
In some embodiments, the amplifying circuit further comprises a fourth resistor, a first end of the fourth resistor is connected to the negative input end of the operational amplifier, and a second end of the fourth resistor is connected to the output end of the operational amplifier.
In some embodiments, the filter circuit includes a fifth resistor and a first capacitor, an output terminal of the operational amplifier is connected to a first terminal of the fifth resistor and a first terminal of the first capacitor, and the fifth resistor and the first terminal of the first capacitor are connected to a ground terminal.
In some embodiments, the analog-to-digital conversion circuit includes an analog-to-digital conversion chip and a sixth resistor, a second pin of the analog-to-digital conversion chip is connected to the filter circuit, a third pin is connected to the ground terminal, a fourth pin is connected to the current output terminal through the sixth resistor, and a fifth pin is connected to the power supply terminal.
In some embodiments, the analog-to-digital conversion circuit further includes a second capacitor and a third capacitor, the first pin of the analog-to-digital conversion chip is connected to the first end of the second capacitor and the first end of the third capacitor, and the second end of the second capacitor and the second end of the third capacitor are connected to the ground.
In some embodiments, the analog-to-digital conversion circuit further includes a fourth capacitor, and the sixth pin of the analog-to-digital conversion chip is connected to the ground terminal through the fourth capacitor.
In some embodiments, the operational amplifier is a general purpose amplifier.
In some embodiments, the analog-to-digital conversion chip is an ADS series chip.
In some embodiments, the operational amplifier is model LM2902DR.
In some embodiments, the analog-to-digital conversion chip is model ADS52J90.
According to the embodiment of the application, the amplification circuit is arranged to amplify the detected weak current signal, the filtering circuit is arranged to filter the current, and the analog-to-digital conversion circuit is arranged to convert the acquired analog current signal into the digital current signal, so that the weak current is acquired, the amplification and the rapid processing are correspondingly carried out, the precision and the sensitivity of the current detection are improved, and meanwhile, a complex current detection device is not needed, and the current detection speed is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a current detection system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the following detailed description of specific embodiments of the present application is given with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present application are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
The current detection system provided by the embodiment of the application is used for avoiding the problem that the conventional weak current detection device cannot achieve high speed, high accuracy and high sensitivity.
Fig. 1 is a schematic circuit diagram of a current detection system according to an embodiment of the present application. Referring to fig. 1, the current detection system includes an amplifying circuit, a filtering circuit and an analog-to-digital conversion circuit connected in sequence, wherein the amplifying circuit includes an operational amplifier A1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the filter circuit comprises a fifth resistor R5 and a first capacitor C1; the analog-to-digital conversion circuit comprises an analog-to-digital conversion chip U1, a sixth resistor R6, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4.
The positive input end of the operational amplifier A1 is connected with the current input end IN to be detected through a first resistor R1, the positive input end of the operational amplifier A1 is connected with the power end through a second resistor R2, the negative input end of the operational amplifier A1 is connected with the grounding end through a third resistor R3, the positive power input end of the operational amplifier A1 is connected with the power end, the negative power input end of the operational amplifier A1 is connected with the grounding end, the first end of a fourth resistor R4 is connected with the negative input end of the operational amplifier A1, the second end of the fourth resistor R4 is connected with the output end of the operational amplifier A1, the output end of the operational amplifier A1 is connected with the first end of a fifth resistor R5 and the first end of a first capacitor C1, the analog-to-digital conversion circuit is connected with the current output end OUT, and the fifth resistor R5 and the first end of the first capacitor C1 are connected with the grounding end.
The first pin REFIN of the analog-to-digital conversion chip U1 is connected to the first end of the second capacitor C2 and the first end of the third capacitor C3, the second pin AINN is connected to the filter circuit, the third pin GND is connected to the ground end, the fourth pin DOUT is connected to the current output end through the sixth resistor R6, the fifth pin VDD is connected to the power end, the sixth pin REFOUT of the analog-to-digital conversion chip U1 is connected to the ground end through the fourth capacitor C4, and the second end of the second capacitor C2 and the second end of the third capacitor C3 are connected to the ground end.
It can be understood that the operational amplifier A1 amplifies the weak current input, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 all play a role of a protection circuit, the fifth resistor R5 in the filter circuit rectifies the output current of the operational amplifier A1, the first capacitor C1 filters the output current, the filtered current is converted by the analog-to-digital conversion chip U1, the analog current signal is converted into a digital current signal and then is output, the quick processing of the weak current is realized, and the precision and the sensitivity of current detection are improved.
In the embodiment of the application, the amplifying circuit is arranged to amplify the detected weak current signal, the filtering circuit is arranged to filter the current, and the analog-to-digital conversion circuit is arranged to convert the acquired analog current signal into the digital current signal, so that the weak current is acquired, the amplification and the rapid processing are correspondingly carried out, the precision and the sensitivity of the current detection are improved, and meanwhile, a complex current detection device is not needed, and the current detection speed is improved.
As a preferred embodiment, the operational amplifier A1 is a general-purpose amplifier, and the model of the operational amplifier A1 is LM2902DR
As a preferred embodiment, the analog-to-digital conversion chip U1 is an ADS series chip, and the model of the analog-to-digital conversion chip U1 is ADS52J90.
The foregoing description is only of the preferred embodiments of the application and the technical principles employed. The present application is not limited to the specific embodiments described herein, but is capable of numerous modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit of the application, the scope of which is set forth in the following claims.
Claims (10)
1. The current detection system is characterized by comprising an amplifying circuit, a filter circuit and an analog-to-digital conversion circuit which are sequentially connected, wherein the amplifying circuit comprises an operational amplifier, a first resistor, a second resistor and a third resistor, the positive input end of the operational amplifier is connected with a current input end to be detected through the first resistor, the positive input end of the operational amplifier is connected with a power supply end through the second resistor, the negative input end of the operational amplifier is connected with a grounding end through the third resistor, the power supply positive input end of the operational amplifier is connected with the power supply end, the power supply negative input end of the operational amplifier is connected with the grounding end, the output end of the operational amplifier is connected with the filter circuit, and the analog-to-digital conversion circuit is connected with the current output end.
2. The current detection system of claim 1, wherein the amplifying circuit further comprises a fourth resistor, a first terminal of the fourth resistor being connected to the negative input terminal of the operational amplifier, and a second terminal of the fourth resistor being connected to the output terminal of the operational amplifier.
3. The current detection system of claim 1, wherein the filter circuit comprises a fifth resistor and a first capacitor, the output terminal of the operational amplifier is connected to the first terminal of the fifth resistor and the first terminal of the first capacitor, and the fifth resistor and the first terminal of the first capacitor are connected to a ground terminal.
4. The current detection system according to claim 1, wherein the analog-to-digital conversion circuit includes an analog-to-digital conversion chip and a sixth resistor, a second pin of the analog-to-digital conversion chip is connected to the filter circuit, a third pin is connected to the ground terminal, a fourth pin is connected to the current output terminal through the sixth resistor, and a fifth pin is connected to the power supply terminal.
5. The current detection system of claim 4, wherein the analog-to-digital conversion circuit further comprises a second capacitor and a third capacitor, the first pin of the analog-to-digital conversion chip is connected to the first end of the second capacitor and the first end of the third capacitor, and the second end of the second capacitor and the second end of the third capacitor are connected to a ground terminal.
6. The current detection system of claim 4, wherein the analog-to-digital conversion circuit further comprises a fourth capacitor, and the sixth pin of the analog-to-digital conversion chip is connected to the ground terminal through the fourth capacitor.
7. The current detection system of claim 1, wherein the operational amplifier is a universal amplifier.
8. The current detection system of claim 4, wherein the analog-to-digital conversion chip is an ADS series chip.
9. The current detection system of claim 1, wherein the operational amplifier is model LM2902DR.
10. The current detection system of claim 8, wherein the analog-to-digital conversion chip is model ADS52J90.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323475475.XU CN221572666U (en) | 2023-12-19 | 2023-12-19 | Current detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323475475.XU CN221572666U (en) | 2023-12-19 | 2023-12-19 | Current detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221572666U true CN221572666U (en) | 2024-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323475475.XU Active CN221572666U (en) | 2023-12-19 | 2023-12-19 | Current detection system |
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| Country | Link |
|---|---|
| CN (1) | CN221572666U (en) |
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2023
- 2023-12-19 CN CN202323475475.XU patent/CN221572666U/en active Active
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