CN214310679U

CN214310679U - Pulse heavy current wave recording device

Info

Publication number: CN214310679U
Application number: CN202022876699.1U
Authority: CN
Inventors: 刘爽
Original assignee: Wuhan Senmuleishi Technology Co ltd
Current assignee: Wuhan Senmuleishi Technology Co ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-09-28
Anticipated expiration: 2030-12-02

Abstract

The utility model relates to the technical field of wave recording equipment, in particular to a pulse heavy current wave recording device, which comprises a sampling module, an integrating circuit, a high-speed ADC acquisition module and a main control chip circuit; the sampling module generates induced voltage after collecting current, the induced voltage enters the high-speed ADC sampling module after being conditioned by the integrating circuit, and the main control chip circuit stores waveform data processed by the high-speed ADC sampling module in an RAM chip for an upper computer to read. The high-speed ADC and the master control with the clock frequency of 150MHz are adopted, the sampling frequency is high, during high-speed acquisition, the DSP/MCU directly stores data from the high-speed ADC into the external RAM through the DMA function, and after the acquisition is finished, the DSP/MCU reads the data stored in the external RAM and uploads the data to the upper computer, so that the higher data throughput is ensured. The sampling plate is highly integrated, small in size, simple and easy to install, good in isolation capacity, not prone to data loss and strong in anti-interference capacity due to the fact that optical fiber serial port communication is adopted, and the sampling plate can be widely and massively used in various high-current circuits.

Description

Pulse heavy current wave recording device

Technical Field

The utility model relates to a record ripples equipment technical field, concretely relates to pulse heavy current record ripples device.

Background

The existing wave recording equipment has the advantages of high sampling rate, high precision and various wave recording starting modes, and has the functions of waveform editing, time sequence analysis, magnitude analysis, vector diagram, switch characteristic analysis, interface real-time display, curve operation and the like. However, in actual engineering application, the wave recorder can only be used as debugging equipment, and is difficult to use in installed and formally operated equipment, which means that the equipment which normally works cannot be observed and monitored. Often along with high-voltage heavy current in high-power, equipment such as oscillograph need accomplish the high pressure isolation, uses the isolation probe that the range scope is bigger, and the cost greatly increased and the operation degree of difficulty are very big, that is to say need retrench more in actual engineering, and is small, can directly insert in the circuit, connect the host computer and carry out the recording equipment of communication operation.

Disclosure of Invention

The utility model provides a pulse heavy current oscillograph device has solved above the oscillograph use inconvenient technical problem.

The utility model provides a pulse heavy current recording device for solving the technical problems, which comprises a sampling module, an integrating circuit, a high-speed ADC acquisition module and a main control chip circuit; the sampling module generates induced voltage after collecting current, the induced voltage enters the high-speed ADC sampling module after being conditioned by the integrating circuit, and the main control chip circuit stores waveform data processed by the high-speed ADC sampling module in an RAM chip for an upper computer to read.

Preferably, the sampling module employs a rogowski coil.

Preferably, the main control chip circuit is a DSP/MCU.

Preferably, the model of the DSP is DSP 28335.

Preferably, the clock frequency of the main control chip circuit is 150 MHz.

Preferably, the chip model of the high-speed ADC sampling module is ADC08B 200.

Preferably, the main control chip circuit is electrically connected with the RAM chip and the upper computer respectively.

Has the advantages that: the utility model provides a pulse heavy current wave recording device, which comprises a sampling module, an integrating circuit, a high-speed ADC acquisition module and a main control chip circuit; the sampling module generates induced voltage after collecting current, the induced voltage enters the high-speed ADC sampling module after being conditioned by the integrating circuit, and the main control chip circuit stores waveform data processed by the high-speed ADC sampling module in an RAM chip for an upper computer to read. The high-speed ADC and the master control with the clock frequency of 150MHz are adopted, the sampling frequency is high, during high-speed acquisition, the DSP/MCU directly stores data from the high-speed ADC into the external RAM through the DMA function, and after the acquisition is finished, the DSP/MCU reads the data stored in the external RAM and uploads the data to the upper computer, so that the higher data throughput is ensured. The sampling plate is highly integrated, small in size, simple and easy to install, good in isolation capacity, not prone to data loss and strong in anti-interference capacity due to the fact that optical fiber serial port communication is adopted, and the sampling plate can be widely and massively used in various high-current circuits.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic diagram of a circuit structure of the pulse heavy current recorder of the present invention.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the utility model provides a pulse heavy current wave recording device, which comprises a sampling module, an integrating circuit, a high-speed ADC acquisition module and a main control chip circuit; the sampling module generates induced voltage after collecting current, the induced voltage enters the high-speed ADC sampling module after being conditioned by the integrating circuit, and the main control chip circuit stores waveform data processed by the high-speed ADC sampling module in an RAM chip for an upper computer to read.

The high-speed ADC and the master control with the clock frequency of 150MHz are adopted, the sampling frequency is high, during high-speed acquisition, the DSP/MCU directly stores data from the high-speed ADC into the external RAM through the DMA function, and after the acquisition is finished, the DSP/MCU reads the data stored in the external RAM and uploads the data to the upper computer, so that the higher data throughput is ensured. The sampling plate is highly integrated, small in size, simple and easy to install, good in isolation capacity, not prone to data loss and strong in anti-interference capacity due to the fact that optical fiber serial port communication is adopted, and the sampling plate can be widely and massively used in various high-current circuits.

Preferably, the sampling module adopts a rogowski coil. The Rogowski coil is used for sampling current, is suitable for measuring alternating current in a wider frequency range, has no special requirements on conductors and sizes, has quicker instant response capability, is widely applied to occasions where the traditional current measuring device such as a current transformer cannot be used, and is used for current measurement, particularly high-frequency and large-current measurement.

In a preferred scheme, the main control chip circuit is a DSP/MCU. The model of the DSP is DSP 28335. The clock frequency of the main control chip circuit is 150 MHz.

The high-speed ADC and the master control with the clock frequency of 150MHz are adopted, the sampling frequency is high, during high-speed acquisition, the DSP/MCU directly stores data from the high-speed ADC into the external RAM through the DMA function, and after the acquisition is finished, the DSP/MCU reads the data stored in the external RAM and uploads the data to the upper computer, so that the higher data throughput is ensured.

Preferably, the chip type of the high-speed ADC sampling module is ADC08B 200.

In a preferred scheme, the main control chip circuit is electrically connected with the RAM chip and the upper computer respectively. The sampling module uses a Rogowski coil, large current passes through the coil, induced voltage is conditioned through an integrating circuit and is collected by a high-speed ADC to enter a main control chip, the main control chip stores waveform data in an external RAM chip, and after one or more sampling periods are finished, the main control chip reads the waveform data in the RAM and uploads the data to an upper computer for observation and analysis.

The working principle is as follows: the rogowski coil is a hollow annular coil, has two kinds of flexibility and hardness, can be directly sheathed on a measured conductor to measure alternating current, the theoretical basis of the measured current is Faraday's law of electromagnetic induction and ampere loop law, when the measured current passes through the center of the rogowski coil along the axis, a correspondingly changed magnetic field is generated in the volume enclosed by the annular winding, according to derivation, the output voltage of the coil is in direct proportion to di/dt when the coil is fixed, namely the output voltage of the rogowski coil is in direct proportion to the differential of the measured current, so the subsequent stage of the rogowski coil is generally connected with an integrator, the output signal is in proportion to the time integral value of the input signal, and the output voltage in direct proportion to the primary current is obtained. The high-speed ADC acquisition module is a high-speed analog-digital converter, converts continuous-time and continuous-amplitude analog signals into discrete-time and discrete-amplitude digital signals, transmits obtained digital quantity to a DSP/MCU through four processes of sampling, sustaining, quantifying and encoding, the DSP/MCU is connected with an upper computer and an RAM, the upper computer is a computer which can directly send out control commands, generally a PC (personal computer), displays recording signals on a screen, and directly stores data into an external RAM (except for refreshing). Generally, the DSP28335 is used as a main control chip, because of its operation speed, the system main frequency can reach 150MHz, which is easy to develop, the data is not easy to overflow, and what is very important is the introduction of DMA. DMA (Direct Memory Access) is a data Access technology commonly used in PCs and high-end single-chip microcomputers. The technology directly transfers data between a system memory and a peripheral space by adding a DMA controller without the participation of a CPU. The purpose of adding the technology to the DSP for industrial control is to liberate the CPU and transfer the batch data transmission work to the DMA controller to be completed, so that the CPU has more time to do a complex signal processing core algorithm. In general, a/D sampling and data processing are required in industrial control applications. In the classical algorithm implementation process, the DSP generally performs a/D data transmission first and then performs various algorithm processes. Now, we can hand over the data transmission work from the temporary register unit of the A/D conversion chip to the internal memory of the chip to the DMA controller, so that the time can be effectively used to interleave other core algorithms. The speed and the precision of recording waves are greatly improved.

The working process is as follows: the current circuit needing to be measured penetrates through the Rogowski coil, the system can start to work after the power supply to the integrating circuit and the control loop is carried out, after the DSP/MCU receives a wave recording instruction, the high-speed ADC starts to work to transmit digital quantity of voltage into the DSP/MCU, the DSP/MCU directly stores data into an external RAM through a DMA function, and after one or more sampling instructions are finished, the DSP/MCU reads and uploads the data to an upper computer. And the upper computer displays the stored waveform data for monitoring and observation.

The embodiment of the utility model provides an use rogowski coil as the sampling of electric current, be applicable to the measurement of the alternating current in the broad frequency range, all do not have special requirement to conductor, size, have very fast reaction capability in the twinkling of an eye, the wide application is in traditional current measurement device like the occasion that current transformer can't be used for current measurement, especially high frequency, heavy current measurement.

The sampling plate is highly integrated, small in size, simple and easy to install, good in isolation capacity, not prone to data loss and strong in anti-interference capacity due to the fact that optical fiber serial port communication is adopted, and the sampling plate can be widely and massively used in various high-current circuits.

In military application field, the device can be used for detection and calibration of each electromagnetic device, for example, the trigger instantaneous waveform of the electromagnetic gun is obtained, the performance of the device can be analyzed from a basic angle, the device detection is facilitated, the improvement is facilitated, and the subsequent calibration of the transmission distance and the accuracy of the electromagnetic gun is also facilitated.

The high current flows through the cable passing through the Rogowski coil, the Rogowski coil induces the high current to generate voltage, the voltage is in direct proportion to the differential of the detected current, the voltage is integrated through the integrator, the output voltage is in direct proportion to the current, the voltage analog quantity is converted into digital quantity and transmitted to the DSP/MCU after passing through the high-speed analog-to-digital converter, the DSP/MCU does not process the data at the moment, in order to ensure the sampling speed, the DMA function is used for directly storing the data into the RAM with the fastest reading and writing speed, after the sampling/recording is finished, the data are read from the RAM, the data are processed and then sent to the upper computer.

Has the advantages that:

the Rogowski coil has unique advantages for high-frequency and large-current measurement, good linearity and easy calibration. Suitable frequencies are from 0.1Hz to 1 MHz.

The device can measure irregular conductors, is convenient to install, does not need to damage the conductors, has no danger of secondary open circuit, and is simple and convenient to maintain;

the DMA technology is used, so that the efficiency of the CPU is greatly improved, and the signal processing speed is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the present invention can be smoothly implemented by those skilled in the art according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.

Claims

1. A pulse heavy current wave recording device is characterized by comprising a sampling module, an integrating circuit, a high-speed ADC (analog-to-digital converter) acquisition module and a main control chip circuit; the sampling module adopts a Rogowski coil; the chip model of the high-speed ADC sampling module is ADC08B 200; the chip model of the main control chip circuit is DSP28335, and the clock frequency is 150 MHz;

the sampling module generates induced voltage after collecting current, the induced voltage passes through the high-speed ADC sampling module is got into after the integrator circuit is tempered, the waveform data storage that the main control chip circuit will be handled through high-speed ADC sampling module is in order for the host computer to read in the RAM chip, the main control chip circuit respectively with RAM chip and host computer electricity are connected.