Voltage detection system

Abstract

The utility model belongs to the technical field of voltage detection, and discloses a voltage detection system which comprises a voltage sampling module, the output end of the voltage sampling module is electrically connected with an optical coupling isolation module, and the output end of the optical coupling isolation module is electrically connected with a single chip microcomputer signal processing module. According to the utility model, the voltage sampling module, the optical coupling isolation module and the single-chip microcomputer signal processing module are arranged, the voltage sampling module realizes real-time sampling and detection of port voltage and transmits an obtained signal to the optical coupling isolation module, and finally the optical coupling isolation module transmits the signal to the single-chip microcomputer signal processing module. The single-chip microcomputer signal processing module processes the signals and displays the obtained voltage amplitude, phase, frequency and voltage zero crossing point in a visual mode through the amplitude signal module, the phase signal module, the frequency signal module and the zero crossing point signal module. And the use of the optical coupler isolation module realizes the electrical isolation of the signal acquisition end and the signal processing end.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage detection, in particular to a voltage detection system. Background Art

[0002] In industrial control applications, power supply voltage sampling and detection is a common requirement, such as in automotive power batteries, mobile phone lithium batteries, and power supplies in automation systems. One purpose of voltage detection is to monitor the power status and another is to verify whether the target circuit is working properly. Usually, voltage sampling is performed by a microcontroller to perform analog-to-digital conversion and data processing. To ensure that the microcontroller is not interfered with by external control circuits or other devices, the microcontroller's minimum system power supply is usually not grounded with input power sources such as power batteries, thermal batteries, and lithium batteries. Therefore, isolated sampling of the input power voltage and current is required.

[0003] Common voltage sampling methods include resistor voltage division sampling and linear optocoupler detection. The resistor voltage division sampling principle is simple and the cost is low, but it cannot achieve isolated sampling. Linear optocoupler detection can achieve voltage isolation sampling, but the accuracy is low. On the other hand, current sampling based on Hall devices can achieve current isolation sampling, but the device size is usually large and not convenient for integrated application. Sampling detection based on operational amplifiers is widely used in engineering practice, but usually cannot achieve isolated sampling, so it needs to be modified. Utility Model Content

[0004] The purpose of the present invention is to solve the above problems and provide a voltage detection system with the advantage of electrical isolation.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a voltage detection system, comprising a voltage sampling module, the output end of the voltage sampling module is electrically connected to an optocoupler isolation module, the output end of the optocoupler isolation module is electrically connected to a single-chip microcomputer signal processing module, and the output end of the single-chip microcomputer signal processing module is electrically connected to an amplitude signal module, a phase signal module, a frequency signal module and a zero-crossing signal module respectively.

[0006] As a preferred embodiment of the present invention, the voltage sampling module samples the port voltage signal through an internal electric energy metering chip, and the electric energy metering chip is a dedicated integrated circuit for electric power metering.

[0007] As a preferred embodiment of the present invention, the voltage sampling module performs voltage sampling by using a resistor voltage divider.

[0008] As a preferred embodiment of the present invention, the voltage sampling module uses 220V AC as a driving power supply.

[0009] As a preferred embodiment of the present invention, the optocoupler input end in the optocoupler isolation module adopts a low-resistance element operating in a current mode.

[0010] As a preferred embodiment of the present invention, the amplitude signal module, phase signal module, frequency signal module and zero-crossing signal module use a line graph visualization method to display and output data.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The utility model sets a voltage sampling module, an optocoupler isolation module and a single-chip computer signal processing module. The voltage sampling module realizes real-time sampling and detection of the port voltage, and transmits the obtained signal to the optocoupler isolation module, and finally the optocoupler isolation module transmits the signal to the single-chip computer signal processing module. The single-chip computer signal processing module processes the signal and obtains the voltage amplitude, phase, frequency and voltage zero crossing in a visual manner through the amplitude signal module, the phase signal module, the frequency signal module and the zero crossing signal module. The use of the optocoupler isolation module realizes the electrical isolation between the signal acquisition end and the signal processing end, thereby ensuring the stability of signal transmission and the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall block diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the specific control method of the utility model.

[0015] In the figure: 1. Voltage sampling module; 2. Optocoupler isolation module; 3. Microcontroller signal processing module; 4. Amplitude signal module; 5. Phase signal module; 6. Frequency signal module; 7. Zero-crossing signal module. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] like Figures 1 to 2As shown, the utility model provides a voltage detection system, including a voltage sampling module 1, the output end of the voltage sampling module 1 is electrically connected to an optocoupler isolation module 2, the output end of the optocoupler isolation module 2 is electrically connected to a single-chip computer signal processing module 3, and the output end of the single-chip computer signal processing module 3 is electrically connected to an amplitude signal module 4, a phase signal module 5, a frequency signal module 6 and a zero-crossing signal module 7 respectively.

[0018] The voltage sampling module 1 can realize voltage sampling; the optocoupler isolation module 2 can realize electrical isolation; the single-chip computer signal processing module 3 can process the voltage signal, the amplitude signal module 4 can output amplitude signal data; the phase signal module 5 can output phase signal data; the frequency signal module 6 can output frequency signal data; the zero-crossing signal module 7 can output zero-crossing signal data. This system uses the voltage sampling module 1 to realize the sampling of the port voltage signal, and transmits the signal to the single-chip computer signal processing module 3 through the optocoupler isolation module 2, thereby realizing the electrical isolation between the voltage sampling module 1 and the single-chip computer signal processing module 3. Finally, the single-chip computer signal processing module 3 processes the sampled signal and outputs it to the amplitude signal module 4, the phase signal module 5, the frequency signal module 6 and the zero-crossing signal module 7, thereby realizing real-time acquisition and detection of the port voltage, thereby improving the safety and stability of signal transmission and the safety of the system.

[0019] refer to Figures 1 to 2 The voltage sampling module 1 samples the port voltage signal through the internal electric energy metering chip, which is a special integrated circuit used for power metering.

[0020] As a technical optimization solution of the utility model, the electric energy metering chip has the characteristics of high precision, small size, low power consumption and low price. It can realize the functions of electric energy metering, data acquisition and data processing through core technologies such as high-precision analog-to-digital converter and digital signal processor.

[0021] refer to Figures 1 to 2 The voltage sampling module 1 uses a resistor voltage divider to perform voltage sampling.

[0022] As a technical optimization solution of the present invention, resistor voltage division refers to a method of distributing voltage according to Ohm's law by connecting multiple resistors in a circuit to achieve voltage distribution and regulation. This method can improve the accuracy of voltage sampling.

[0023] refer to Figures 1 to 2 ,The voltage sampling module 1 uses 220V AC as the driving power supply.

[0024] As a technical optimization solution of the present invention, alternating current refers to a current whose direction changes periodically with time, and the average current in one cycle is zero. Unlike direct current, its direction changes with time, while direct current does not change periodically.

[0025] refer to Figures 1 to 2 The optocoupler input terminal in the optocoupler isolation module 2 adopts a current-type low-resistance element.

[0026] As a technical optimization solution of the present invention, the adoption of low-resistance elements working in current mode enables the optocoupler isolation module 2 to have a strong common-mode suppression capability, thereby ensuring the stable operation of the single-chip signal processing module 3. The use of the optocoupler isolation module 2 achieves electrical isolation, ensuring the stability of the sampling circuit and the single-chip circuit; helps to reduce electromagnetic interference and spike noise from other electronic circuits; realizes isolation between different voltage levels, and improves the safety and efficiency of voltage sampling.

[0027] refer to Figures 1 to 2 The amplitude signal module 4, the phase signal module 5, the frequency signal module 6 and the zero-crossing signal module 7 use a line graph visualization method to display and output data.

[0028] As a technical optimization solution of the present invention, a line chart is a commonly used chart type, which is mainly used to display continuous data that changes over time. It can clearly show the data change trend over a period of time, thereby facilitating a more intuitive display of amplitude data, phase data, frequency data and zero-crossing point data.

[0029] The working principle and use process of this utility model:

[0030] This system uses a resistor voltage divider to sample the port voltage through the voltage sampling module 1. At the same time, the voltage sampling module 1 is equipped with a dedicated voltage sampling chip, so that the voltage data of the port can be accurately collected and detected in real time. After the voltage sampling module 1 completes the collection, it transmits the collected voltage data to the optocoupler isolation module 2. After being processed by the optocoupler isolation module 2, the signal is transmitted to the single-chip signal processing module 3. Through the processing of the optocoupler isolation module 2, the one-way transmission of the sampling signal to the single-chip signal processing module 3 can be realized, and the input and output ends are completely electrically isolated. The output signal has no effect on the input end, which improves the anti-interference ability. The single-chip signal processing module 3 processes the sampling signal through analog-to-digital conversion and related algorithms, thereby splitting the original signal into voltage amplitude, voltage phase, frequency and voltage zero-crossing signal. Finally, the processed signal is respectively transmitted to the amplitude signal module 4, the phase signal module 5, the frequency signal module 6 and the zero-crossing signal module 7 and displayed in detail through the visualization of a broken line graph. With the mutual cooperation of each module, the real-time acquisition and detection of the port voltage is realized, thereby ensuring the safety and stability of the voltage detection system.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage detection system, comprising a voltage sampling module (1), characterized in that: The output end of the voltage sampling module (1) is electrically connected to an optocoupler isolation module (2), the output end of the optocoupler isolation module (2) is electrically connected to a single-chip computer signal processing module (3), and the output end of the single-chip computer signal processing module (3) is electrically connected to an amplitude signal module (4), a phase signal module (5), a frequency signal module (6), and a zero-crossing signal module (7).

2. A voltage detection system according to claim 1, characterized in that: The voltage sampling module (1) samples the port voltage signal through an internal electric energy metering chip, and the electric energy metering chip is a special integrated circuit used for electric power metering.

3. A voltage detection system according to claim 1, characterized in that: The voltage sampling module (1) performs voltage sampling by means of resistance voltage division.

4. A voltage detection system according to claim 1, characterized in that: The voltage sampling module (1) uses 220V alternating current as a driving power source.

5. The voltage detection system according to claim 1, wherein: The optical coupler input end in the optical coupling isolation module (2) adopts a low-resistance element operating in a current mode.

6. A voltage detection system according to claim 1, characterized in that: The amplitude signal module (4), phase signal module (5), frequency signal module (6) and zero-crossing signal module (7) use a line graph visualization method to display and output data.

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