CN216647140U - Signal acquisition module suitable for various direct current CT - Google Patents
Signal acquisition module suitable for various direct current CT Download PDFInfo
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- CN216647140U CN216647140U CN202123217249.2U CN202123217249U CN216647140U CN 216647140 U CN216647140 U CN 216647140U CN 202123217249 U CN202123217249 U CN 202123217249U CN 216647140 U CN216647140 U CN 216647140U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The utility model belongs to the technical field of insulation detection of a direct current system, and particularly relates to a signal acquisition module suitable for various direct current CTs, which comprises a shell, a micro-processing unit arranged in the shell, an 485/232 interface, a 16-to-1 signal selection switch, a capture unit, 1-16 signal acquisition units, a control circuit and a CAN (controller area network) interface, wherein the 485/232 interface, the 16-to-1 signal selection switch, the capture unit, the 1-16 signal acquisition units, the control circuit and the CAN interface are connected to the micro-processing unit, the 485/232 interface is used for connecting a CT in a 485/232 communication mode, the capture unit is used for connecting a CT in a square wave output mode, and the 1-16 signal acquisition units are used for connecting a CT in an analog quantity output mode. The utility model improves the traditional signal acquisition module, and is provided with an 485/232 interface, a capture unit and 1-16 signal acquisition units, so that the signal acquisition module meets the signal acquisition requirements of various direct current CTs, and has powerful functions and convenient maintenance.
Description
Technical Field
The utility model belongs to the technical field of insulation detection of a direct current system, and particularly relates to a signal acquisition module suitable for various direct current CT.
Background
The insulation monitoring device of the direct current system for the station is divided into two types on the method of branch grounding detection according to the CT installed in the system, one type is a low-frequency alternating current method suitable for alternating current CT, and the other type is a leakage current detection method suitable for direct current CT. The direct current CT of each manufacturer has different working modes, and is roughly divided into a direct current CT of 485 communication mode, a direct current CT of 232 communication mode, a direct current CT of square wave output mode and a direct current CT of analog output mode; the direct current CT of the analog quantity output mode is divided into 10mA, 20mA and the like, the direct current CT is also 485 communication CT, and the communication protocol with the signal acquisition module is defined by each manufacturer. The types of direct current CT are so many, at present, various signal acquisition modules are adopted to be matched with the direct current CT, the functions are single, and the maintenance is troublesome; therefore, it is necessary to develop a signal acquisition module suitable for various dc CT.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects and shortcomings in the prior art, the utility model provides the signal acquisition module which is improved on the traditional signal acquisition module, is provided with the 485/232 interface, the capture unit and the 1-16 signal acquisition units, meets the signal acquisition requirements of various direct current CTs, has strong functions, is convenient to maintain and is suitable for various direct current CTs.
The technical scheme of the utility model is as follows: a signal acquisition module suitable for various direct current CTs comprises a shell, a micro-processing unit arranged in the shell, an 485/232 interface, a 16-to-1 signal selection switch, a capture unit, 1-16 signal acquisition units, a control circuit and a CAN port, wherein the 485/232 interface, the 16-to-1 signal selection switch, the capture unit, the 1-16 signal acquisition units, the control circuit and the CAN port are connected to the micro-processing unit, the 485/232 interface is used for connecting the CT in a 485/232 communication mode, the capture unit is used for connecting the CT in a square wave output mode, and the 1-16 signal acquisition units are used for connecting the CT in an analog quantity output mode.
Preferably, the data information of the CT in 485/232 communication mode is sent to the micro-processing unit through 485/232 interface, the micro-processing unit processes the signal and uploads the result to the host computer through the CAN port, and the micro-processing unit issues an instruction to the CT through 485/232 interface.
Preferably, the square wave output mode of CT is sent to the capturing unit through a 16-to-1 signal selection switch to be converted into a current signal which is sent to the micro-processing unit, the micro-processing unit processes the signal and uploads the result to the host through the CAN port, and meanwhile, the micro-processing unit also sends an instruction to the CT through the capturing unit.
Preferably, signals of the CT in the analog output mode are converted into digital signals through a 1-16 signal acquisition unit and then are sent to a micro-processing unit; the micro-processing unit processes the signal and uploads the result to the host computer through the CAN port, and meanwhile, the micro-processing unit issues an instruction to the CT through the 1-16 signal acquisition unit.
Preferably, each signal acquisition unit comprises a band-pass filter circuit, a program-controlled amplification circuit, a two-phase-locked circuit, an integrating circuit and an A/D (analog-to-digital) converter, wherein the band-pass filter circuit is used for selecting a required frequency band signal; the program control amplifying circuit is an analog quantity output mode sensor matched with different parameters; the biphase phase-locked circuit is used for eliminating the influence of capacitance and inductive load and other high-frequency signals on detection.
Preferably, the input end of the band-pass filter circuit is used for connecting a CT of an analog output mode, the program-controlled amplification circuit is connected to the band-pass filter circuit, the two-phase-locked circuit is connected to the program-controlled amplification circuit, the integration circuit is connected to the two-phase-locked circuit, the A/D conversion is connected to the integration circuit, the microprocessing unit is connected to the A/D conversion and the program-controlled amplification circuit, and the program-controlled amplification circuit is further connected to the A/D conversion.
The utility model improves the traditional signal acquisition module, and is provided with an 485/232 interface, a capture unit and 1-16 signal acquisition units, so that the signal acquisition module meets the signal acquisition requirements of various direct current CTs, and has powerful functions and convenient maintenance.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic block diagram of a signal acquisition unit of the present invention;
FIG. 3 is an external profile view of the present invention;
FIG. 4 is a functional block diagram of the present invention;
FIG. 5 is a block flow diagram of the present invention;
FIG. 6 is a schematic block diagram of a signal acquisition module of a DC CT matched with a 485 communication mode in the background art of the present invention;
fig. 7 is a schematic block diagram of a signal acquisition module of a dc CT matched with a square wave output mode in the background art of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 5, a signal acquisition module suitable for various direct current CTs includes a housing, a microprocessor unit disposed in the housing, and an 485/232 interface, a 16-to-1 signal selection switch, a capture unit, 1-16 signal acquisition units, a control circuit and a CAN port connected to the microprocessor unit, wherein the 485/232 interface is used for connecting a CT in 485/232 communication mode, the capture unit is used for connecting a CT in square wave output mode, and the 1-16 signal acquisition units are used for connecting a CT in analog output mode. 485/232 the data information of CT is sent to the microprocessor unit through 485/232 interface, the microprocessor unit processes the signal and uploads the result to the host computer through CAN interface, and the microprocessor unit also sends command to CT through 485/232 interface.
The CT in the square wave output mode is sent to the capturing unit through the 16-to-1 signal selection switch to be converted into a current signal, the current signal is sent to the micro-processing unit, the micro-processing unit processes the signal and uploads a result to the host through the CAN port, and meanwhile the micro-processing unit sends an instruction to the CT through the capturing unit.
The signal of CT in analog output mode is converted into digital signal by 1-16 signal acquisition unit and sent to the microprocessor; the micro-processing unit processes the signal and uploads the result to the host computer through the CAN port, and meanwhile, the micro-processing unit issues an instruction to the CT through the 1-16 signal acquisition unit.
Each signal acquisition unit comprises a band-pass filter circuit, a program-controlled amplification circuit, a two-phase-locked circuit, an integrating circuit and an A/D (analog/digital) converter, wherein the band-pass filter circuit is used for selecting a required frequency band signal; the program control amplifying circuit is an analog quantity output mode sensor matched with different parameters; the biphase phase-locked circuit is used for eliminating the influence of capacitance and inductive load and other high-frequency signals on detection.
The input end of the band-pass filter circuit is used for connecting a CT (computed tomography) of an analog output mode, the program-controlled amplification circuit is connected to the band-pass filter circuit, the two-phase-locked circuit is connected to the program-controlled amplification circuit, the integrating circuit is connected to the two-phase-locked circuit, the A/D conversion is connected to the integrating circuit, the micro-processing unit is connected to the A/D conversion and the program-controlled amplification circuit, and the program-controlled amplification circuit is further connected to the A/D conversion.
When the utility model is applied, if 485 interface CT is installed on site, all lines A of the CT are connected in parallel at the 485-A end of the module, all lines B are connected in parallel at the 485-B end of the module, the module MCU sends instructions to the CT through the 485 interface, and the CT uploads the acquired signals to the module microprocessing unit through the 485 interface; if the CT with the 232 interface is installed on site, all TX lines of the CT are connected to the 232-RX end in parallel, all RX lines are connected to the 232-TX end in parallel, all GND lines are connected to the 232-GND end in parallel, the module MCU sends an instruction to the CT through the 232 interface, and the CT uploads an acquired signal to the module microprocessing unit through the 232 interface; if the direct current CT outputting square waves is installed on site, square wave output signal lines of all the CTs are connected to a signal input terminal of the module in sequence, all the ground wires are connected to a module signal ground in parallel, and square wave signals of 16 paths of CTs are sent to a module micro-processing unit after passing through a square wave signal voltage conversion circuit in sequence; if the direct current CT outputting the analog quantity is installed on site, all analog signal lines of the CT are connected to a signal input terminal of the module in sequence, all ground wires are connected to a module signal ground in parallel, and 16 paths of analog signals of the CT are transmitted to a module micro-processing unit after passing through a signal acquisition unit; the module MCU processes and calculates the received data to obtain a final result, and uploads the result data to the host through the CAN port.
No matter which type of direct current CT or two or more types of direct current C are installed and operated on site, the signal acquisition module can be matched with the on-site CT through arrangement, other changes are not needed, and the on-site reconstruction is facilitated; if the signal acquisition module breaks down in operation, the module parameters can be led into a new module, and online maintenance is facilitated.
Claims (6)
1. The utility model provides a signal acquisition module suitable for various direct current CT which characterized in that: the intelligent CT detection device comprises a shell, a micro-processing unit arranged in the shell, an 485/232 interface, a 16-to-1 signal selection switch, a capture unit, 1-16 signal acquisition units, a control circuit and a CAN interface, wherein the 485/232 interface, the 16-to-1 signal selection switch, the capture unit, the 1-16 signal acquisition units, the control circuit and the CAN interface are connected to the micro-processing unit, the 485/232 interface is used for being connected with a CT in a 485/232 communication mode, the capture unit is used for being connected with a CT in a square wave output mode, and the 1-16 signal acquisition units are used for being connected with a CT in an analog quantity output mode.
2. The signal acquisition module suitable for various direct current CTs according to claim 1, wherein: 485/232 the data information of CT is sent to the microprocessor unit through 485/232 interface, the microprocessor unit processes the signal and uploads the result to the host computer through CAN interface, and the microprocessor unit also sends command to CT through 485/232 interface.
3. The signal acquisition module suitable for various direct current CTs according to claim 1, wherein: the CT with square wave output mode is sent to the capturing unit through the 16-to-1 signal selection switch to be converted into a current signal, the current signal is sent to the micro-processing unit, the micro-processing unit processes the signal and uploads the result to the host through the CAN port, and meanwhile, the micro-processing unit also sends an instruction to the CT through the capturing unit.
4. The signal acquisition module suitable for various direct current CTs according to claim 1, wherein: the signal of CT in analog output mode is converted into digital signal by 1-16 signal acquisition unit and sent to the microprocessor; the micro-processing unit processes the signal and uploads the result to the host computer through the CAN port, and meanwhile, the micro-processing unit issues an instruction to the CT through the 1-16 signal acquisition unit.
5. The signal acquisition module suitable for various direct current CTs according to claim 1, wherein: each signal acquisition unit comprises a band-pass filter circuit, a program-controlled amplification circuit, a two-phase-locked circuit, an integrating circuit and an A/D (analog/digital) converter, wherein the band-pass filter circuit is used for selecting a required frequency band signal; the program control amplifying circuit is an analog quantity output mode sensor matched with different parameters; the biphase phase-locked circuit is used for eliminating the influence of capacitance and inductive load and other high-frequency signals on detection.
6. The signal acquisition module suitable for various direct current CTs according to claim 5, wherein: the input end of the band-pass filter circuit is used for connecting a CT (computed tomography) of an analog output mode, the program-controlled amplification circuit is connected to the band-pass filter circuit, the two-phase-locked circuit is connected to the program-controlled amplification circuit, the integrating circuit is connected to the two-phase-locked circuit, the A/D conversion is connected to the integrating circuit, the micro-processing unit is connected to the A/D conversion and the program-controlled amplification circuit, and the program-controlled amplification circuit is further connected to the A/D conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123217249.2U CN216647140U (en) | 2021-12-17 | 2021-12-17 | Signal acquisition module suitable for various direct current CT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123217249.2U CN216647140U (en) | 2021-12-17 | 2021-12-17 | Signal acquisition module suitable for various direct current CT |
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| Publication Number | Publication Date |
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| CN216647140U true CN216647140U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123217249.2U Active CN216647140U (en) | 2021-12-17 | 2021-12-17 | Signal acquisition module suitable for various direct current CT |
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| CN (1) | CN216647140U (en) |
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2021
- 2021-12-17 CN CN202123217249.2U patent/CN216647140U/en active Active
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