CN210136268U

CN210136268U - Non-contact alternating current detection device

Info

Publication number: CN210136268U
Application number: CN201920614459.9U
Authority: CN
Inventors: 高波; 向小康; 李晓波; 徐逢秋
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-03-10
Anticipated expiration: 2029-04-30

Abstract

The utility model provides a non-contact alternating current detection device, include: the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module, the main controller and the display module; the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module, the main controller and the display module are sequentially connected in series through leads. The signal to be detected is input into the system in a non-contact way by the magnetic induction coil according to the electromagnetic induction principle; the current-voltage conversion module converts a current signal into a voltage signal; the analog-to-digital conversion module converts the analog voltage signal into a digital voltage signal and sends the digital voltage signal to the FFT module. The FFT module can obtain the fundamental wave amplitude and frequency and the harmonic amplitude and frequency of the signal to be detected, and the signal to be detected is sent into the main controller and is displayed through the display module. The utility model discloses can real-time non-contact measure alternating current signal's fundamental wave frequency and amplitude and the frequency and the amplitude of each harmonic, improved measurement accuracy simultaneously.

Description

Non-contact alternating current detection device

Technical Field

The utility model belongs to measurement and control instrument field especially relates to a non-contact alternating current detection device.

Background

In the modern times, the application of alternating current is everywhere visible, and the measurement of the alternating current is very necessary. At present, the measurement of alternating current is mainly carried out in series connection by using a multimeter, and the method has complex operation and larger potential safety hazard. Therefore, the current detection device which is low in cost, simple in circuit and capable of measuring the alternating current in a non-contact mode is designed, potential safety hazards of people in measurement can be reduced, the amplitude of the alternating current can be obtained, information such as the frequency and harmonic frequency amplitude of the alternating current can be measured, and the current detection device has strong practical significance.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model relates to a realized having the frequency of non-contact measurement alternating current signal, the current detection device of amplitude function, system's wholeness can be stable, and human-computer interaction is friendly.

The technical scheme of the utility model a non-contact alternating current detection device, include: the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module, the main controller and the display module;

the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module and the main controller are sequentially connected in series through a lead; the main controller is connected with the display module through a wire.

Preferably, the magnetic induction coil is a self-made coil, and the alternating current signal is taken out in a non-contact manner according to the electromagnetic induction principle;

preferably, the current-voltage conversion module is configured to convert a current signal into a voltage analog signal;

preferably, the analog-to-digital conversion module is configured to convert the voltage analog signal into a digital voltage signal and send the digital voltage signal to the FFT module;

preferably, the FFT module is configured to calculate the amplitude and frequency of the fundamental wave and the harmonic of the digital voltage signal, and then transmit them to the main controller;

preferably, the main controller is used as a control center of the whole system and displays the amplitude and the frequency of fundamental waves and harmonic waves on the display module;

preferably, the display module is an OLED liquid crystal display module with the model of 0.96 inches, and is used for displaying the amplitude and the frequency of fundamental waves and harmonic waves.

The utility model discloses the advantage lies in can real-time non-contact measure alternating current signal's fundamental wave frequency and amplitude and the frequency and the amplitude of each time harmonic, has improved measurement accuracy simultaneously.

Drawings

FIG. 1: is the integral block diagram of the system of the utility model;

FIG. 2: is a circuit diagram of the magnetic induction coil of the utility model;

FIG. 3: is a circuit diagram of the current-voltage conversion module of the utility model;

FIG. 4: is the analog-to-digital conversion module circuit of the utility model;

FIG. 5: is a circuit diagram of the power amplification module of the utility model;

FIG. 6: is a circuit diagram of the main controller module of the utility model;

FIG. 7: is a circuit diagram of the display module of the utility model;

FIG. 8: is the hardware FFT circuit diagram of the utility model.

Detailed Description

To facilitate understanding and practice of the invention for those skilled in the art, the following detailed description of the invention is provided in connection with the accompanying drawings and the embodiments, it being understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

Please refer to fig. 1, which is an overall block diagram of the system of the present invention, including: the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module, the main controller and the display module;

The magnetic induction coil is a self-made coil, and an alternating current signal is taken out in a non-contact manner according to the electromagnetic induction principle;

the current-voltage conversion module is used for converting the current signal into a voltage analog signal;

the analog-to-digital conversion module is used for converting the voltage analog signal into a digital voltage signal and sending the digital voltage signal to the FFT module;

the FFT module is used for calculating the amplitude and frequency of fundamental waves and harmonic waves of digital voltage signals and then transmitting the amplitude and frequency to the main controller;

the main controller is used as a control center of the whole system and displays the amplitude and the frequency of fundamental waves and harmonic waves on the display module;

the display module is an OLED liquid crystal display module with the model of 0.96 inch and is used for displaying the amplitude and the frequency of fundamental waves and harmonic waves.

The magnetic induction coil is a self-made coil;

the current-voltage conversion module is selected to be an operational amplifier OPA 227;

the analog-to-digital conversion module is selected from an ADS8505 analog-to-digital conversion chip;

the FFT module is selected to be an FFT chip PDSP 16510;

the main controller is selected as a third-generation board FPGA of intel corporation;

the display module is an OLED liquid crystal display module with the model of 0.96 inch.

The following description, with reference to fig. 1 to 8, describes a specific embodiment of the present invention as follows:

the signal to be measured is input into the system by the magnetic induction coil in a non-contact mode according to the electromagnetic induction principle, and then the current-voltage conversion module composed of the OPA227 converts the current signal into a voltage signal. The analog-to-digital conversion module converts the analog voltage signal into a digital voltage signal and sends the digital voltage signal to the FFT module. The FFT module can obtain the fundamental amplitude and frequency and the harmonic amplitude and frequency of the signal to be detected. And finally, sending the signal to the main controller to display the fundamental wave amplitude and frequency and the harmonic amplitude and frequency information of the signal by the display module.

Although the present description uses terms such as magnetic induction coil, current-to-voltage conversion module, analog-to-digital conversion module, FFT module, main controller, display module, etc., more terms are used, it does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe the nature of the invention and should not be construed as imposing any additional limitations thereon which would depart from the spirit of the invention.

It should be understood that parts of the specification not set forth in detail are well within the prior art.

It should be understood that the above description of the preferred embodiments is given in some detail, and not as a limitation to the scope of the invention, and that various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention as defined by the appended claims.

Claims

1. A non-contact alternating current detection device, comprising: the magnetic induction coil, the current-voltage conversion module, the analog-to-digital conversion module, the FFT module, the main controller and the display module;

2. The non-contact alternating current detection device according to claim 1, wherein: the magnetic induction coil is a self-made coil, and takes out the alternating current signal in a non-contact manner according to the electromagnetic induction principle.

3. The non-contact alternating current detection device according to claim 1, wherein: the current-voltage conversion module is used for converting the current signal into a voltage analog signal.

4. The non-contact alternating current detection device according to claim 1, wherein: the analog-to-digital conversion module is used for converting the voltage analog signal into a digital voltage signal and sending the digital voltage signal to the FFT module.

5. The non-contact alternating current detection device according to claim 1, wherein: the FFT module is used for calculating the amplitude and frequency of fundamental waves and harmonic waves of digital voltage signals and then transmitting the amplitude and frequency to the main controller.

6. The non-contact alternating current detection device according to claim 1, wherein: the main controller is used as a control center of the whole system, and the amplitude and the frequency of fundamental waves and harmonic waves are displayed on the display module.

7. The non-contact alternating current detection device according to claim 1, wherein: the display module is an OLED liquid crystal display module with the model of 0.96 inch and is used for displaying the amplitude and the frequency of fundamental waves and harmonic waves.