CN211856723U - Weak current operation detection system - Google Patents
Weak current operation detection system Download PDFInfo
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- CN211856723U CN211856723U CN202020365646.0U CN202020365646U CN211856723U CN 211856723 U CN211856723 U CN 211856723U CN 202020365646 U CN202020365646 U CN 202020365646U CN 211856723 U CN211856723 U CN 211856723U
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Abstract
The utility model discloses a weak current operation detection system, including current sampling circuit, amplification compensating circuit and shaping circuit, current sampling circuit is used for gathering the operating current of the equipment to be measured, and send into the amplification compensating circuit after carrying out RC and handling, reduces the instant peak interference that the equipment to be measured operation of switching on and shutting down produced and causes the damage to detection system; the amplification compensation circuit adopts a double-operational-amplifier mode to amplify and compensate the sampling current, and has good compensation effect on input offset current and temperature drift in the operational-amplifier process, so that the stability of signal amplification output is improved; the shaping circuit adopts the LC wave filter to carry out the filtering to the sampling current after enlargeing, then sends into the singlechip after the comparison plastic, and the singlechip shows in sending into the display with testing result, makes things convenient for the staff to look over the reference, the utility model discloses effectively improve the interference killing feature of system, testing result is accurate effective, guarantees that the automatic control process of equipment is accurate reliable.
Description
Technical Field
The utility model relates to a light current equipment detects technical field, especially relates to a light current operation detecting system.
Background
The weak current covers a wide range, such as communications, electronics, computers, broadcast televisions, mobile phones, medical instruments, various household electronic appliances, and the like, which are all referred to as "weak current". With the development of electrical automation, the control is greatly controlled by weak current, so that the detection of the weak current operation is the basis for ensuring the stable operation of the automatic control process. The existing weak current operation detection core is used for detecting main parameters of equipment during operation, for example, whether the equipment has faults such as short circuit, open circuit and the like is judged by detecting current parameters.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above situation, in order to overcome the defects of the prior art, the present invention provides a weak current operation detection system.
The technical scheme for solving the problem is as follows: a weak current operation detection system comprises a current sampling circuit, an amplification compensation circuit and a shaping circuit, wherein the current sampling circuit is used for collecting working current of equipment to be detected, the working current is sent into the amplification compensation circuit after RC processing, the amplification compensation circuit adopts a double-operational-amplification mode to amplify and compensate sampling current, the shaping circuit adopts an LC filter to filter the amplified sampling current and then sends the filtered sampling current into a single chip microcomputer after comparison and shaping, and the single chip microcomputer sends a detection result into a display to be displayed after carrying out operation processing on an input current signal.
Preferably, the current sampling circuit comprises a current sensor J1, a pin 1 of the current sensor J1 is connected with one end of a capacitor C1 and one end of a resistor R2 through a resistor R1, and a pin 2 of the current sensor J1 is connected with the other end of the capacitor C1 and the other end of the resistor R2 in parallel and grounded.
Preferably, the amplification compensation circuit comprises operational amplifiers AR1 and AR2, a non-inverting input terminal of the operational amplifier AR1 is connected to the other end of the resistor R1 through a resistor R3 and is grounded through a capacitor C2, an inverting input terminal and an output terminal of the operational amplifier AR1 are connected to an inverting input terminal of the operational amplifier AR2 through a resistor R7, and a non-inverting input terminal of the operational amplifier AR2 is grounded through a resistor R8.
Preferably, the non-inverting input terminal of the operational amplifier AR1 is further connected to one end of a resistor R4 and one end of a capacitor C3, the other end of the resistor R4 is connected to one end of a resistor R5 and one end of a resistor R6, the other ends of the resistor R5 and the capacitor C3 are connected to the output terminal of the operational amplifier AR2, and the other end of the resistor R6 is grounded.
Preferably, the shaping circuit comprises an inductor L1, one end of the inductor L1 is connected with the output end of an operational amplifier AR2, the other end of the inductor L1 is connected with one end of a capacitor C4 and one end of a resistor R9 and the non-inverting input end of an operational amplifier AR3, the other ends of the capacitor C4 and the resistor R9 are grounded, the inverting input end of the operational amplifier AR3 is connected with one ends of resistors R10 and R11, the other end of the resistor R10 is connected with a +5V power supply, the other end of the resistor R11 is grounded, and the output end of the operational amplifier AR3 is connected with the current signal detection end of the single.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model adopts the current sensor J1 to detect the working current of the equipment to be detected in real time, and adopts RC filtering to reduce the damage of the instantaneous peak interference generated by the startup and shutdown operation of the equipment to be detected to the detection system;
2. the operational amplifiers AR1 and AR2 in the amplification compensation circuit form a double operational amplifier mode to quickly amplify the output signal of the current sampling circuit, and have good compensation effect on the input offset current and the temperature drift in the operational amplifier process, so that the stability of signal amplification output is improved;
3. the shaping circuit adopts LC filtering to improve the accuracy of signal detection, and sends the signal into the singlechip after the comparison and shaping for operation processing, and the singlechip sends the detection result into the display for displaying, and the staff can conveniently look over the reference.
Drawings
Fig. 1 is the schematic diagram of the current sampling circuit and the amplification compensation circuit of the present invention.
Fig. 2 is a schematic diagram of a shaping circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A weak current operation detection system comprises a current sampling circuit, an amplification compensation circuit and a shaping circuit, wherein the current sampling circuit is used for collecting working current of equipment to be detected and sending the working current into the amplification compensation circuit after RC processing, the amplification compensation circuit adopts a double-operational-amplification mode to amplify and compensate sampling current, the shaping circuit adopts an LC filter to filter the amplified sampling current, and then the sampling current is sent into a single chip microcomputer after comparative shaping. The single chip microcomputer is connected with the display through a serial port, and after the single chip microcomputer performs operation processing on input current signals, detection results are sent to the display to be displayed.
As shown in fig. 1, the current sampling circuit includes a current sensor J1, a pin 1 of the current sensor J1 is connected to one end of a capacitor C1 and one end of a resistor R2 through a resistor R1, and a pin 2 of the current sensor J1 is connected to the other end of the capacitor C1 and the other end of the resistor R2 in parallel and grounded. The current sensor J1 samples the working current of the equipment to be tested in real time, and sends the sampled current to the RC low-pass filter formed by the resistor R1 and the capacitor C1 for processing, so that the damage of the instantaneous peak interference generated by the on-off operation of the equipment to be tested to a detection system is reduced.
The sampling circuit after RC processing is sent into an amplification compensation circuit for signal enhancement processing, the amplification compensation circuit comprises an operational amplifier AR1 and an AR2, the non-inverting input end of the operational amplifier AR1 is connected with the other end of a resistor R1 through a resistor R3 and is grounded through a capacitor C2, the inverting input end and the output end of the operational amplifier AR1 are connected with the inverting input end of the operational amplifier AR2 through a resistor R7, and the non-inverting input end of the operational amplifier AR2 is grounded through a resistor R8. The non-inverting input end of the operational amplifier AR1 is further connected to one ends of a resistor R4 and a capacitor C3, the other end of the resistor R4 is connected to one ends of a resistor R5 and a resistor R6, the other ends of the resistor R5 and the capacitor C3 are connected to the output end of the operational amplifier AR2, and the other end of the resistor R6 is grounded.
In the processing process of the amplification compensation circuit, the operational amplifiers AR1 and AR2 form a double operational amplifier mode to quickly amplify the output signal of the current sampling circuit, and input offset voltage is effectively reduced. Meanwhile, the output signal of the operational amplifier AR2 is fed back by the resistor-capacitor network and then sent to the non-inverting input end of the operational amplifier AR1, so that the compensation effect on the input offset current and the temperature drift in the operational amplifier process is good, and the stability of signal amplification and output is improved.
As shown in fig. 2, the shaping circuit includes an inductor L1, one end of the inductor L1 is connected to the output end of the operational amplifier AR2, the other end of the inductor L1 is connected to one end of a capacitor C4, one end of a resistor R9 and the non-inverting input end of the operational amplifier AR3, the other ends of the capacitor C4 and the resistor R9 are grounded, the inverting input end of the operational amplifier AR3 is connected to one ends of resistors R10 and R11, the other end of the resistor R10 is connected to a +5V power supply, the other end of the resistor R11 is grounded, and the output end of the operational amplifier AR3 is connected to the current signal. The inductor L1 and the capacitor C4 form an LC filter to accurately filter an output signal of the operational amplifier AR2, the accuracy of signal detection is greatly improved, then the operational amplifier AR3 compares and shapes the signal by using the principle of a comparator, a standard 0-5V detection signal required by the single chip microcomputer is obtained, and the accuracy and effectiveness of the operation processing of the single chip microcomputer are guaranteed.
The utility model discloses when specifically using, adopt current sensor J1 to carry out real-time detection to the operating current of treating equipment for measurement to adopt the RC filtering to reduce the peak interference in the twinkling of an eye that the equipment for measurement switching on and shutting down operation produced and cause the harm to detecting system. The operational amplifiers AR1 and AR2 in the amplification compensation circuit form a double operational amplifier mode to quickly amplify the output signal of the current sampling circuit, and have good compensation effect on the input offset current and the temperature drift in the operational amplifier process, so that the stability of signal amplification output is improved. The shaping circuit adopts LC filtering to improve the accuracy of signal detection, and sends the signal into the singlechip after the comparison and shaping for operation processing, and the singlechip sends the detection result into the display for displaying, and the staff can conveniently look over the reference.
To sum up, the utility model discloses circuit design is ingenious, and is effectual to gathering current signal processing, effectively improves the interference killing feature of system, and the testing result is accurate effective, guarantees that the automatic control process of equipment is accurate reliable.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (5)
1. The utility model provides a light current operation detecting system, includes current sampling circuit, amplification compensation circuit and shaping circuit, its characterized in that: the current sampling circuit is used for collecting the working current of the equipment to be detected, carrying out RC processing on the working current and then sending the working current into the amplification compensation circuit, the amplification compensation circuit carries out amplification compensation on the sampling current in a double-operational-amplification mode, the shaping circuit carries out filtering on the amplified sampling current by an LC filter and then sends the sampling current into the single chip microcomputer after comparison and shaping, and the single chip microcomputer carries out operation processing on an input current signal and then sends a detection result into a display for displaying.
2. The weak current operation detection system according to claim 1, wherein: the current sampling circuit comprises a current sensor J1, wherein a pin 1 of the current sensor J1 is connected with one ends of a capacitor C1 and a resistor R2 through a resistor R1, and a pin 2 of a current sensor J1 is connected with the other ends of the capacitor C1 and the resistor R2 in parallel and grounded.
3. The weak current operation detection system according to claim 2, wherein: the amplifying compensation circuit comprises operational amplifiers AR1 and AR2, wherein the non-inverting input end of the operational amplifier AR1 is connected with the other end of the resistor R1 through a resistor R3 and is grounded through a capacitor C2, the inverting input end and the output end of the operational amplifier AR1 are connected with the inverting input end of the operational amplifier AR2 through a resistor R7, and the non-inverting input end of the operational amplifier AR2 is grounded through a resistor R8.
4. The weak current operation detection system according to claim 3, wherein: the non-inverting input end of the operational amplifier AR1 is further connected to one ends of a resistor R4 and a capacitor C3, the other end of the resistor R4 is connected to one ends of a resistor R5 and a resistor R6, the other ends of the resistor R5 and the capacitor C3 are connected to the output end of the operational amplifier AR2, and the other end of the resistor R6 is grounded.
5. The weak current operation detection system according to claim 4, wherein: the shaping circuit comprises an inductor L1, one end of the inductor L1 is connected with the output end of an operational amplifier AR2, the other end of the inductor L1 is connected with one end of a capacitor C4 and one end of a resistor R9 and the non-inverting input end of an operational amplifier AR3, the other ends of the capacitor C4 and the resistor R9 are grounded, the inverting input end of the operational amplifier AR3 is connected with one ends of resistors R10 and R11, the other end of the resistor R10 is connected with a +5V power supply, the other end of the resistor R11 is grounded, and the output end of the operational amplifier AR3 is connected with the current signal detection end of the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020365646.0U CN211856723U (en) | 2020-03-21 | 2020-03-21 | Weak current operation detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020365646.0U CN211856723U (en) | 2020-03-21 | 2020-03-21 | Weak current operation detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211856723U true CN211856723U (en) | 2020-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020365646.0U Expired - Fee Related CN211856723U (en) | 2020-03-21 | 2020-03-21 | Weak current operation detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211856723U (en) |
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2020
- 2020-03-21 CN CN202020365646.0U patent/CN211856723U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 Termination date: 20210321 |