CN215415830U - Magnetic field size detection circuit for ammeter - Google Patents
Magnetic field size detection circuit for ammeter Download PDFInfo
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- CN215415830U CN215415830U CN202121235469.5U CN202121235469U CN215415830U CN 215415830 U CN215415830 U CN 215415830U CN 202121235469 U CN202121235469 U CN 202121235469U CN 215415830 U CN215415830 U CN 215415830U
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Abstract
The utility model discloses a magnetic field size detection circuit for an ammeter, which relates to the technical field of magnetic field detection and comprises a signal sampling module, a signal processing module, a main control module, a communication module and a display module; the signal sampling module is used for sampling a magnetic field, the signal processing module is used for amplifying a sampling signal and taking an absolute value to output a direct current effective value signal, the main control module is used for receiving the direct current effective value signal and transmitting the direct current effective value signal to the display module and the communication module, the communication module is used for carrying out wireless communication with workers, and the display module is used for displaying the waveform condition of the direct current effective value signal. The magnetic field size detection circuit for the electric meter performs anti-interference processing on the magnetic field sensor, precisely amplifies induced electromotive force detected by the magnetic field sensor and performs full-wave rectification, enhances signal precision, has low power consumption and noise of the circuit, has strong interference viewing capability, and can realize a real-time communication function.
Description
Technical Field
The utility model relates to the technical field of magnetic field detection, in particular to a magnetic field size detection circuit for an ammeter.
Background
In recent years, with the wider application of the smart electric meter, the smart electric meter technology is continuously developed to become an indispensable part of a metering tool, but because of more electromagnetic field interference in life, if the layout of an electric meter chip is unreasonable, the quality of a switching power supply is unqualified, and the stability of a crystal oscillator is poor, the compatibility of the electric meter and the electromagnetic field is affected, so that the normal work and accurate metering of the electric energy meter are affected, and therefore, the magnetic field detection of the electric meter is necessary.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a magnetic field size detection circuit for an electric meter, which aims to solve the problems in the background technology.
According to a first aspect of embodiments of the present invention, there is provided a magnetic field magnitude detection circuit for an electricity meter, the magnetic field magnitude detection circuit for an electricity meter comprising: the system comprises a signal sampling module, a signal processing module, a main control module and a communication module;
the signal sampling module is used for sampling induced electromotive force output by the magnetic field detection sensor;
the signal processing module is used for precisely amplifying the induced electromotive force output by the signal sampling module and converting an alternating current signal output by the magnetic field detection sensor into a direct current effective value signal of an absolute value;
the main control module is used for receiving the direct current effective value signal output by the signal processing module and transmitting the received direct current effective value signal to the display module and the communication module;
and the communication module is used for receiving the direct current effective value signal transmitted by the main control module and carrying out wireless communication with the working personnel.
Compared with the prior art, the utility model has the beneficial effects that: the magnetic field size detection circuit for the electric meter performs anti-interference processing on the magnetic field sensor, precisely amplifies induced electromotive force detected by the magnetic field sensor and performs full-wave rectification, enhances signal precision, has low power consumption and noise of the circuit, has strong interference viewing capability, and can realize a real-time communication function.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a magnetic field magnitude detection circuit for an electricity meter according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a magnetic field magnitude detection circuit for an electricity meter according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a communication module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a magnetic field magnitude detection circuit for an electric meter, including: the device comprises a signal sampling module 1, a signal processing module 2, a main control module 3, a communication module 4 and a display module 5;
specifically, the signal sampling module 1 is configured to sample induced electromotive force output by the magnetic field detection sensor;
the signal processing module 2 is used for precisely amplifying the induced electromotive force output by the signal sampling module 1 and converting an alternating current signal output by the magnetic field detection sensor into a direct current effective value signal of an absolute value; the first end of the signal processing module 2 is connected with the second end of the signal acquisition module;
the main control module 3 is used for receiving the direct current effective value signal output by the signal processing module 2 and transmitting the received direct current effective value signal to the display module 5 and the communication module 4; the first end of the main control module 3 is connected with the second end of the signal processing module 2;
the communication module 4 is used for receiving the direct current effective value signal transmitted by the main control module 3 and carrying out wireless communication with workers; the communication module 4 is connected with the second end of the main control module 3
The display module 5 is used for receiving the direct current effective value signal transmitted by the main control module 3 and displaying the magnetic field waveform; the input end of the display module 5 is connected with the third end of the main control module 3.
In a specific embodiment, the measuring method of the magnetic field in the signal sampling module 1 includes an electromagnetic induction method, a hall effect method, a magnetoresistance effect method, and the like, and the electric meter magnetic field is detected according to different measuring methods, and the most basic practical hall effect method principle is selected to detect the electric meter magnetic field; the signal processing module 2 adopts an amplifying circuit consisting of an operational amplifier to amplify the induced electromotive force; the main control module 3 performs AD (Analog Digital) sampling on an effective voltage signal of a single chip or a Central Processing Unit (CPU) and transmits the effective voltage signal; the communication module 4 can realize a wireless communication function by selecting RS485 communication; the display module 5 uses an oscilloscope to observe the waveform of the sampled effective voltage signal, which is not described herein.
Example 2: based on embodiment 1, please refer to fig. 2 and fig. 3, in an embodiment of the magnetic field magnitude detection circuit for an electricity meter according to the present invention, the signal sampling module 1 includes a magnetic field sensor U2, a first resistor R1, a first capacitor C1, and a first power supply + 5V;
specifically, a first end of the magnetic field sensor U2 is connected to a first end of a first resistor R1 and a first end of a first capacitor C1, a second end of the first resistor R1 is connected to a first power supply +5V, and a second end of the first capacitor C1 is connected to a ground end and a second end of the magnetic field sensor U2.
Further, the signal processing module 2 includes a primary amplifying unit 201, a secondary adjustable amplifying unit 202 and a precise full-wave rectifying unit 203; the main control module 3 comprises a first controller U1;
specifically, the primary amplification unit 201 is configured to perform primary amplification on the induced electromotive force output by the signal sampling module 1;
the secondary adjustable amplifying unit 202 is configured to perform multiple optional amplification on the signal output by the primary amplifying unit 201;
the precise full-wave rectification unit 203 is used for performing full-wave rectification on the signal output by the secondary adjustable amplification unit 202 to obtain the absolute value of the signal and outputting the absolute value;
the first end of the primary amplification unit 201 is connected to the second end of the signal sampling module 1, and the second end of the primary amplification unit 201 is connected to the first end of the precision full-wave rectification unit 203 through the secondary adjustable amplification unit 202.
Further, the primary amplifying unit 201 comprises a second resistor R2, a third resistor R3, a fourth resistor R4 and a first operational amplifier a 1;
specifically, a first end of the second resistor R2 is connected to a third end of the magnetic field sensor U2, a second end of the second resistor R2 is connected to a first end of the fourth resistor R4 and an inverting end of the first operational amplifier a1, a non-inverting end of the first operational amplifier a1 is connected to a ground end through the third resistor R3, and a second end of the fourth resistor R4 is connected to an output end of the first operational amplifier a 1.
Further, the two-stage adjustable amplifying unit 202 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first switch S1, a second switch S2, a third switch S3, a potentiometer RP1, and a second operational amplifier a 2;
specifically, a first end of the fifth resistor R5 is connected to an output end of the first operational amplifier a1, a second end of the fifth resistor R5 is connected to an inverting end of the second operational amplifier a2, a moving end of the first switch S1, a moving end of the second switch S2, and a moving end of the third switch S3, a non-moving end of the first switch S1 is connected to a first end of the seventh resistor R7, a non-moving end of the second switch S2 is connected to a first end of the eighth resistor R8, a non-moving end of the third switch S3 is connected to a slider end of a potentiometer RP1, a second end of the eighth resistor R8, a second end of the seventh resistor R7, and an output end of the second operational amplifier a2 through a potentiometer RP1, and a non-phase end of the second operational amplifier a2 is grounded through the sixth resistor R6.
Further, the precision full-wave rectification unit 203 comprises a third operational amplifier A3, a fourth operational amplifier a4, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a second diode D2, a third diode D3, a fourth diode D4 and a fifth diode D5;
specifically, the ninth resistor R9 is connected to the output end of the second operational amplifier a2 and the non-inverting end of the fourth operational amplifier a4, the other end of the ninth resistor R9 is connected to the inverting end of the third operational amplifier A3, the anode of the second diode D2 and the tenth resistor R10, the output end of the third operational amplifier A3 is connected to the cathode of the second diode D2, the other end of the tenth resistor R10 and the anode of the third diode D3, the non-inverting end of the third operational amplifier A3 is grounded, the inverting end of the fourth operational amplifier a4 is connected to the anode of the fourth diode D4 and the eleventh resistor R11, the output end of the fourth operational amplifier a4 is connected to the anode of the fifth diode D5, the cathode of the fourth diode D4 and the other end of the eleventh resistor R11, and the cathode of the fifth diode D5 is connected to the cathode of the third diode D3 and the AD 1.
Further, the communication module 4 comprises a level shifter U3, a first capacitor C1, a second power supply +12V and a communication interface U4;
specifically, the first terminal, the second terminal, the third terminal and the fourth terminal of the level shifter U3 are respectively connected to the IO port of the first controller U1, the fifth terminal of the level shifter U3 is connected to the second power supply +12V and the first terminal of the first capacitor C1, the second terminal of the first capacitor C1 is connected to ground and the sixth terminal of the level shifter U3, and the seventh terminal and the eighth terminal of the level shifter U3 are respectively connected to the communication interface U4.
In a specific embodiment, the magnetic field sensor U2 may be a hall sensor SS495 with a very high linearity; the capacity of the first capacitor C1 is 1uF-10uF, so that the interference of high-frequency signals on the magnetic field sensor U2 is reduced; the first operational amplifier A1, the second operational amplifier A2, the third operational amplifier A3 and the fourth operational amplifier A4 adopt ADA4522 operational amplifiers, have the characteristics of zero drift, low power consumption and low noise, and well amplify and rectify induced electromotive force; the resistance of the ninth resistor R9 in the compact full-wave rectification unit is equal to the tenth resistor R10; the first controller U1 can be an AT mega48 singlechip; the level converter U3 can use MAX485 to complete the conversion of TTL/RS485 communication level.
In the embodiment of the utility model, a signal acquisition module detects the magnetic field of an ammeter through a magnetic field sensor U2, a signal processing module 2 receives induced electromotive force output by the signal acquisition module, alternating signals are output to direct current effective value signals through primary amplification, secondary amplification and precise full-bridge rectification, the direct current effective value signals are transmitted to a first controller U1 for AD sampling, finally the direct current effective value signals are subjected to waveform display through a display module 5 through a first controller U1, wireless communication and data interaction are carried out through an RS485 chip of a communication module 4, wherein in the signal processing module 2, the induced electromotive force is subjected to primary amplification processing through a primary amplification unit 201, a secondary adjustable amplification unit selects proper amplification factors to further amplify the signals, and absolute value processing is carried out on the input signals through a precise full-bridge rectification unit.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A magnetic field magnitude detection circuit for an electricity meter, characterized by:
this a magnetic field size detection circuit for ammeter includes: the system comprises a signal sampling module, a signal processing module, a main control module and a communication module;
the signal sampling module is used for sampling induced electromotive force output by the magnetic field detection sensor;
the signal processing module is used for precisely amplifying the induced electromotive force output by the signal sampling module and converting an alternating current signal output by the magnetic field detection sensor into a direct current effective value signal of an absolute value;
the main control module is used for receiving the direct current effective value signal output by the signal processing module and transmitting the received direct current effective value signal to the display module and the communication module;
and the communication module is used for receiving the direct current effective value signal transmitted by the main control module and carrying out wireless communication with the working personnel.
2. The circuit of claim 1, wherein the circuit further comprises a display module;
the display module is used for receiving the direct current effective value signal transmitted by the main control module and displaying the magnetic field waveform;
and the input end of the display module is connected with the third end of the main control module.
3. The magnetic field magnitude detection circuit for an electricity meter of claim 1, wherein said signal sampling module comprises a magnetic field sensor, a first resistor, a first capacitor, and a first power source; the main control module comprises a first controller;
the first end of the magnetic field sensor is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor is connected with the first power supply, and the second end of the first capacitor is connected with the ground end and the second end of the magnetic field sensor.
4. The magnetic field size detection circuit for the electricity meter according to claim 3, wherein the signal processing module comprises a primary amplifying unit, a secondary adjustable amplifying unit and a precise full-wave rectifying unit;
the primary amplification unit is used for performing primary amplification on the induced electromotive force output by the signal sampling module;
the secondary adjustable amplifying unit is used for performing multiple self-selection amplification on the signal output by the primary amplifying unit;
the precise full-wave rectification unit is used for performing full-wave rectification on the signal output by the secondary adjustable amplification unit to obtain the absolute value of the signal and outputting the absolute value;
the first end of the first-stage amplification unit is connected with the second end of the signal sampling module, and the second end of the first-stage amplification unit is connected with the first end of the precise full-wave rectification unit through the second-stage adjustable amplification unit.
5. The magnetic field magnitude detection circuit for an electricity meter of claim 3, wherein said communication module comprises a level shifter, a first capacitor, a second power source, and a communication interface;
the first end, the second end, the third end and the fourth end of the level shifter are respectively connected with an IO port of the first controller, the fifth end of the level shifter is connected with the second power supply and the first end of the first capacitor, the second end of the first capacitor is connected with the ground and the sixth end of the level shifter, and the seventh end and the eighth end of the level shifter are respectively connected with the communication interface.
6. The circuit of claim 4, wherein the primary amplification unit comprises a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;
the first end of the second resistor is connected with the third end of the magnetic field sensor, the second end of the second resistor is connected with the first end of the fourth resistor and the inverting end of the first operational amplifier, the in-phase end of the first operational amplifier is connected with the ground end through the third resistor, and the second end of the fourth resistor is connected with the output end of the first operational amplifier.
7. The circuit of claim 6, wherein the two-stage adjustable amplification unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switch, a second switch, a third switch, a potentiometer, and a second operational amplifier;
the first end of the fifth resistor is connected with the output end of the first operational amplifier, the second end of the fifth resistor is connected with the inverting end of the second operational amplifier, the moving end of the first switch, the moving end of the second switch and the moving end of the third switch, the fixed end of the first switch is connected with the first end of the seventh resistor, the fixed end of the second switch is connected with the first end of the eighth resistor, the fixed end of the third switch is connected with the slide end of the potentiometer, the second end of the eighth resistor, the second end of the seventh resistor and the output end of the second operational amplifier through the potentiometer, and the same-phase end of the second operational amplifier is grounded through the sixth resistor.
8. The circuit of claim 7, wherein the precise full-wave rectification unit comprises a third operational amplifier, a fourth operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, a second diode, a third diode, a fourth diode, and a fifth diode;
the output end of the third operational amplifier is connected with the cathode of the third operational amplifier, the other end of the tenth resistor and the anode of the third diode, the inverting end of the fourth operational amplifier is connected with the anode of the fourth diode and the eleventh resistor, the output end of the fourth operational amplifier is connected with the anode of the fifth diode, the cathode of the fourth diode and the other end of the eleventh resistor, and the cathode of the fifth diode is connected with the cathode of the third diode and the AD end of the first controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121235469.5U CN215415830U (en) | 2021-06-03 | 2021-06-03 | Magnetic field size detection circuit for ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121235469.5U CN215415830U (en) | 2021-06-03 | 2021-06-03 | Magnetic field size detection circuit for ammeter |
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| Publication Number | Publication Date |
|---|---|
| CN215415830U true CN215415830U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121235469.5U Active CN215415830U (en) | 2021-06-03 | 2021-06-03 | Magnetic field size detection circuit for ammeter |
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| CN (1) | CN215415830U (en) |
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- 2021-06-03 CN CN202121235469.5U patent/CN215415830U/en active Active
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