CN211979033U - Multichannel lightning current information acquisition board card - Google Patents
Multichannel lightning current information acquisition board card Download PDFInfo
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- CN211979033U CN211979033U CN201922410525.3U CN201922410525U CN211979033U CN 211979033 U CN211979033 U CN 211979033U CN 201922410525 U CN201922410525 U CN 201922410525U CN 211979033 U CN211979033 U CN 211979033U
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Abstract
The utility model discloses a multichannel lightning current information acquisition integrated circuit board, through converting the analog lightning current signal that obtains with rogowski coil as the sensor into digital signal, transmit digital signal to FPFA in real time, utilize FPGA high-speed processing data ability, adopt border to trigger and amplitude to limit the comparison technique, reduce and trigger the threshold, filter the circuit clutter simultaneously and disturb, judge lightning current signal accurately; the digital signal is output in a delayed mode by adopting an annular queue storage and transmission technology, so that the loss of wave head data in lightning current information is avoided, and the complete lightning current waveform generated in each back-striking discharge process is truly restored. The multichannel lightning current information acquisition circuit adopts a board card level design development mode, and can be additionally provided with lightning current acquisition board cards according to the actual situation on site, so that the number of monitoring channels is increased, meanwhile, the multichannel lightning current acquisition board cards can be replaced at any time as a maintainable unit, the maintenance time is shortened, and the maintainability of the system is improved.
Description
Technical Field
The utility model relates to an electricity specifically is a lightning current gathers integrated circuit board.
Background
The lightning current information comprises parameters such as waveform, polarity and amplitude, and the mastered lightning current information can provide original basis for analyzing lightning accidents and distinguishing accident responsibilities, designing lightning protection circuits and lightning protection engineering and formulating lightning standards. At present, research on lightning current information acquisition technology is carried out in the fields of electric power, wind power, railways and the like which are easily influenced by lightning current, and part of research results are put into specific industrial application, so that good practical application effect is achieved. The document ' development of a lightning current waveform online monitoring device capable of recording multiple lightning strokes ' (high voltage technology, volume 39, journal 11) ', which comprises a lightning current sensor, a monitoring device and a terminal server, wherein the monitoring device adopts a multichannel parallel acquisition technology and a frequency conversion acquisition technology to realize acquisition and storage of multichannel multiple lightning stroke data, and has the advantages of multiple acquisition channels, less occupied space of data storage, capability of acquiring multiple lightning strokes and the like. However, when the amplitude of the lightning current signal exceeds the preset limit value, the device starts the lightning current waveform acquisition and data storage, loses part of wave head data, causes incomplete acquired lightning current waveform information, and cannot be used for acquiring the lightning current signal with low amplitude because of high trigger level (3 KA).
Utility model patent CN 104267250B: the device comprises an acquisition circuit, an i-Core2 Core board and a time service module, is characterized by being capable of acquiring and storing multipath lightning current waveforms and has the advantages of high sampling frequency, high clock precision and the like. However, the device needs an additional hardware trigger circuit, and when a lightning current signal exists, the lightning current data acquisition is started, so that part of wave head data can be lost, and meanwhile, the device also does not have a frequency conversion acquisition function, so that the waste of storage space can be caused.
Generally, the current research on multi-channel lightning current information acquisition is more, and part of the research lacks experimental foundation and has one or more of the following defects:
(1) the adoption of a hardware triggering technology has poor anti-interference capability and is not beneficial to the adjustment of a triggering threshold;
(2) the method adopts a technology of starting acquisition of lightning current information when a lightning current signal exists, so that the waveform of the lightning current is incomplete;
(3) the characteristics of rapid wave front time change and smooth intermediate waveform change of the lightning current signal are not fully considered, a large amount of useless lightning current waveform data are stored, and the storage space waste is caused.
For some fields needing dozens or dozens of acquisition channels, the acquisition channels are not easy to expand in the current acquisition scheme, the miniaturization design of products is not easy, and the products are not convenient to maintain.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multichannel lightning current information acquisition integrated circuit board, through will regard as the analog lightning current signal that the sensor acquireed with the rogowski coil to convert digital signal, transmit digital signal to FPFA in real time, utilize FPGA high-speed processing data ability, adopt the border to trigger and the amplitude limits the comparison technique, reduce and trigger the threshold, filter the circuit clutter simultaneously and disturb, judge lightning current signal accurately; the digital signal is output in a delayed mode by adopting an annular queue storage and transmission technology, so that the loss of wave head data in lightning current information is avoided, and the complete lightning current waveform generated in each back-striking discharge process is truly restored. The multichannel lightning current information acquisition circuit adopts a board card level design development mode, and can be additionally provided with lightning current acquisition board cards according to the actual situation on site, so that the number of monitoring channels is increased, meanwhile, the multichannel lightning current acquisition board cards can be replaced at any time as a maintainable unit, the maintenance time is shortened, and the maintainability of the system is improved.
For overcoming the not enough of prior art, the utility model provides a multichannel lightning current information acquisition integrated circuit board design method carries out analog signal to digital signal's conversion in real time through adopting a plurality of lightning current acquisition circuits, can the parallel acquisition lightning current data of multichannel to for lightning protection circuit design, lightning protection engineering design and transformation provide data support. In order to solve the problems, the scheme is realized by the following technical means:
a multichannel lightning current information acquisition board card comprises an external interface module, a power supply module, an indicator light module, an FPGA module, a lightning current information acquisition module, an SRAM module and a clock module, wherein the external interface module is connected with the FPGA module through the lightning current information acquisition module, and the FPGA module is connected with an external communication interface through the external interface module; the external interface module is respectively connected with the power supply module, the FPGA module and the lightning current acquisition module, provides an input power supply interface for the power supply module, provides a communication interface for the FPGA module and provides a lightning current signal input interface for the lightning current acquisition module; the power supply module converts an external input power supply and provides a working power supply for the indicator lamp module, the FPGA module, the lightning current acquisition module, the SRAM module and the clock module; the FPGA module is connected with the indicator light module, the lightning current acquisition module, the SRAM module and the clock module, and provides an electric signal for the indicator light module, so that the indicator light module displays the state of the lightning current acquisition module, and simultaneously reads acquisition data from the lightning current acquisition module;
the lightning current acquisition module comprises a plurality of paths of protection modules, an integration module, a signal conditioning module and an A/D conversion module which are the same and are connected in sequence; the input end of the multi-path protection module is respectively connected with the external interface module; the data output ends of the A/D conversion modules are connected in parallel and then connected with the FPGA module; the control signals of the A/D conversion modules are respectively connected with the FPGA module, and under the control of the FPGA module, the acquired data of the lightning current acquisition module is output to the FPGA module in a time-sharing mode in one acquisition period.
The lightning information acquisition module comprises 4 same protection modules, an integration module, a signal conditioning module and an A/D conversion module which are connected in sequence.
The FPGA module can control lightning current information of 8 channels to be acquired simultaneously, wherein 4 channels of lightning current information acquisition channels are a module, one module is used for acquiring data and transmitting the data to the FPGA module in a sampling period in a time-sharing manner by using one transmission channel, and the FPGA module stores the lightning current information acquisition data of 4 channels in the same SRAM module in a time-sharing manner in the sampling period.
The FPGA module comprises a self-checking module, an FIFO module, a triggering module, a clock control module, a data acquisition control module, a data read-write control module and a communication module; the self-checking module monitors the input signal, judges whether the acquisition channel is abnormal according to the value of the input signal, and then controls the on and off of an indicator light of the indicator light module to display the state of the acquisition channel; the FIFO module carries out delay output of N sampling periods on input data to realize the integrity acquisition of input signal waveforms; the triggering module judges whether the input signal is a lightning current signal by adopting edge triggering and amplitude limiting comparison technology, and when the lightning current signal exists, the collected data read-write control module writes the output data of the FIFO module and the time information output by the clock control module into the SRAM module together to realize the temporary storage of the lightning current information; the communication module realizes the output of the acquired data and the reception of the control instruction, and can set the delay period of the FIFO module, the trigger threshold and the acquisition frequency and the frequency conversion frequency according to the received instruction.
The utility model has the advantages that:
the utility model provides a multichannel lightning current information acquisition integrated circuit board design method can realize the collection to the lightning current signal of multichannel monitoring point, and the extension of collection passageway in the site application of being convenient for is regarded as the system maintenance unit simultaneously, can replace at any time as the extension of system maintenance unit, reduces maintenance duration, improves the system maintainability.
The utility model discloses in acquisition circuit design, adopt the mode that the data collection passageway is multiplexing, the timesharing was gathered, the high-speed processing function of make full use of FPGA data, on the basis that does not influence the real-time collection of data collection, analysis, processing, the chip resource is practiced thrift to the at utmost. Meanwhile, the edge triggering and amplitude limiting comparison technology is adopted for software filtering, so that the effective data judgment efficiency and reliability are improved, the hardware cost is reduced, and the size of the multichannel lightning current information acquisition board card is reduced. In the process of collecting lightning current waveforms, according to the characteristics of quick wave front time change and smooth intermediate waveform change of the existing lightning current signal waveforms, the variable frequency collection and annular queue storage and transmission technology is adopted, so that the lightning current waveforms in the lightning stroke process can be completely restored, wave head data are not lost, similar data storage capacity is reduced, and storage space is reduced. The design method gives consideration to circuit cost, collected data processing, waveform restoring authenticity and efficiency.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a block diagram of the lightning current collecting module in the present embodiment;
fig. 3 is a block diagram of the FPGA module in this embodiment.
Detailed Description
The utility model discloses, fig. 1 is the utility model discloses a structure block diagram, in order to realize the synchronous collection of multichannel lightning current information, this embodiment provides a multichannel lightning current information acquisition integrated circuit board, including external interface module 100, power module 200, pilot lamp module 300, FPGA module 400, lightning current information acquisition module 500, SRAM module 600 and clock module 700. The external interface module is respectively connected with the power supply module, the FPGA module and the lightning current acquisition module, provides an input power supply interface for the power supply module, provides a communication interface for the FPGA module and provides a lightning current signal input interface for the lightning current acquisition module; the power supply module converts an external input power supply and provides a working power supply for the indicator lamp module, the FPGA module, the lightning current acquisition module, the SRAM module and the clock module; the FPGA module is connected with the indicator light module, the lightning current acquisition module, the SRAM module and the clock module, and provides an electric signal for the indicator light module, so that the indicator light module displays the state of the lightning current acquisition module (normally working bright spots and abnormally working lights out), and simultaneously reads acquisition data from the lightning current acquisition module.
It should be noted here that, in order to fully exert the fast data processing capability of the FPGA, in this embodiment, one FPGA module may control the simultaneous acquisition of the lightning current information of 8 channels, where 4 channels are taken as one module, one module acquires data and transmits the data to the FPGA module in a sampling period by using one transmission channel, and the FPGA module stores the lightning current information acquisition data of 4 channels in a sampling period in a same SRAM module in a time sharing manner. The method can save FPGA resources, ensure the consistency of the trigger time of the lightning current acquisition channel and facilitate the analysis of the subsequent acquired data.
As shown in fig. 2, the block diagram of the lightning current collecting module in this embodiment includes 4 paths of same protecting modules 501, integrating modules 502, signal conditioning modules 503, and a/D conversion modules 504 connected in sequence. The input ends of the 4-path protection module are respectively connected with the external interface module; the data output ends of the four A/D conversion modules are connected in parallel and then connected with the FPGA module; control signals of the four A/D conversion modules are respectively connected with the FPGA module, and under the control of the FPGA module, collected data of the lightning current collection module are output to the FPGA module in a time-sharing mode in one collection period.
It should be noted here that each functional module of the lightning current collecting module can be implemented by adopting a conventional technical means in the art, and only a conventional integrated circuit chip needs to be selected according to actual application. Specifically, the protection circuit: the subsequent circuit can be protected so as to prevent signals such as surge and thunder from damaging the subsequent circuit. An integrating circuit: generally, for collecting lightning current signals, a rogowski coil is commonly used as a lightning current sensor at present, and an output signal of the rogowski coil is a differential signal of a real lightning current signal, so that an integration module is required to restore the output signal of the rogowski coil to obtain the real lightning current signal. The signal conditioning circuit: the amplitude of the lightning current signal output by the integration module cannot meet the requirements of a subsequent A/D module, and the amplitude needs to be converted so as to meet the input requirements of the A/D module. An A/D module: the FPGA module is used for converting the processed lightning current signals (analog signals) into digital signals for the data processing of the subsequent FPGA module.
As shown in fig. 3, the FPGA module of this embodiment forms a block diagram, and includes a self-checking module 401, an FIFO module 402, a triggering module 403, a clock control module 404, a data acquisition control module 405, a data read-write control module 406, and a communication module 407. The self-checking module monitors the input signal, judges whether the acquisition channel is abnormal according to the value of the input signal, and further controls the on (the acquisition channel is normal) and off (the acquisition channel is abnormal) of an indicator lamp of the indicator lamp module to display the state of the acquisition channel; the FIFO module carries out delay output of N sampling periods on input data to realize the integrity acquisition of input signal waveforms; the triggering module judges whether the input signal is a lightning current signal by adopting edge triggering and amplitude limiting comparison technology, and when the lightning current signal exists, the collected data read-write control module writes the output data of the FIFO module and the time information output by the clock control module into the SRAM module together to realize the temporary storage of the lightning current information; the communication module realizes the output of the acquired data and the reception of the control instruction, and can set the delay period of the FIFO module, the trigger threshold and the acquisition frequency and the frequency conversion frequency according to the received instruction.
Furthermore, the clock module connected with the FPGA module is also included, and the FPGA module can read clock information in real time and correct the clock.
And furthermore, the system also comprises an SRAM module connected with the FPGA module, wherein the SRAM module comprises two SRAM chips, and one SRAM chip can store lightning current information of four channels.
Further, the following devices can be selected for each module:
the connector adopted by the external interface module is 09061486901 of HARTING company;
the power module adopts a golden sun-rise power supply, and has the model: URA2405YMD-10WR3, VRB2403S-6WR 3;
an indicator light module: the indicator light is PBT133D-308F of Beijing semi-nine science and technology Limited;
the FPGA of the FPGA module is ep4ce15f17c8n of ALTERA company;
the SRAM module adopts a chip of IS61WV25616BLL of ISSI company;
the chip adopted by the clock module is DS1302ZN + of DALLAS company;
the device adopted by the protection module is SMAJ33CA of DIODES company;
the chip adopted by the integration module is LME49990MA of TI company;
the chip adopted by the signal conditioning module is OPA842ID of TI company;
the chip adopted by the A/D module is ADS803 of TI company.
Claims (4)
1. The utility model provides a multichannel thunder current information acquisition integrated circuit board which characterized in that:
the lightning protection device comprises an external interface module, a power supply module, an indicator light module, an FPGA module, a lightning current information acquisition module, an SRAM module and a clock module, wherein the external interface module is connected with the FPGA module through the lightning information acquisition module; the external interface module is respectively connected with the power supply module, the FPGA module and the lightning current acquisition module, provides an input power supply interface for the power supply module, provides a communication interface for the FPGA module and provides a lightning current signal input interface for the lightning current acquisition module; the power supply module converts an external input power supply and provides a working power supply for the indicator lamp module, the FPGA module, the lightning current acquisition module, the SRAM module and the clock module; the FPGA module is connected with the indicator light module, the lightning current acquisition module, the SRAM module and the clock module, and provides an electric signal for the indicator light module, so that the indicator light module displays the state of the lightning current acquisition module, and simultaneously reads acquisition data from the lightning current acquisition module;
the lightning current acquisition module comprises a plurality of paths of protection modules, an integration module, a signal conditioning module and an A/D conversion module which are the same and are connected in sequence; the input end of the multi-path protection module is respectively connected with the external interface module; the data output ends of the A/D conversion modules are connected in parallel and then connected with the FPGA module; the control signals of the A/D conversion modules are respectively connected with the FPGA module, and under the control of the FPGA module, the acquired data of the lightning current acquisition module is output to the FPGA module in a time-sharing mode in one acquisition period.
2. The multi-channel lightning current information acquisition board card of claim 1, characterized in that: the lightning information acquisition module comprises 4 same protection modules, an integration module, a signal conditioning module and an A/D conversion module which are connected in sequence.
3. The multi-channel lightning current information acquisition board card of claim 1, characterized in that: the FPGA module can control lightning current information of 8 channels to be acquired simultaneously, wherein 4 channels of lightning current information acquisition channels are a module, one module is used for acquiring data and transmitting the data to the FPGA module in a sampling period in a time-sharing manner by using one transmission channel, and the FPGA module stores the lightning current information acquisition data of 4 channels in the same SRAM module in a time-sharing manner in the sampling period.
4. The multi-channel lightning current information acquisition board card of claim 1, characterized in that: the FPGA module comprises a self-checking module, an FIFO module, a triggering module, a clock control module, a data acquisition control module, a data read-write control module and a communication module; the self-checking module monitors the input signal, judges whether the acquisition channel is abnormal according to the value of the input signal, and then controls the on and off of an indicator light of the indicator light module to display the state of the acquisition channel; the FIFO module carries out delay output of N sampling periods on input data to realize the integrity acquisition of input signal waveforms; the triggering module judges whether the input signal is a lightning current signal by adopting edge triggering and amplitude limiting comparison technology, and when the lightning current signal exists, the collected data read-write control module writes the output data of the FIFO module and the time information output by the clock control module into the SRAM module together to realize the temporary storage of the lightning current information; the communication module realizes the output of the acquired data and the reception of the control instruction, and can set the delay period of the FIFO module, the trigger threshold and the acquisition frequency and the frequency conversion frequency according to the received instruction.
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| CN201922410525.3U CN211979033U (en) | 2019-12-28 | 2019-12-28 | Multichannel lightning current information acquisition board card |
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| CN201922410525.3U CN211979033U (en) | 2019-12-28 | 2019-12-28 | Multichannel lightning current information acquisition board card |
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