CN104698345A - Data acquisition and processing system for small current neutral grounding line selection - Google Patents
Data acquisition and processing system for small current neutral grounding line selection Download PDFInfo
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Abstract
The invention discloses a data acquisition and processing system for small current neutral grounding line selection. The data acquisition and processing system comprises a zero-sequence current signal processing module, a data interface CAN module, a single chip microcomputer signal processing module and a power source transformation processing module. Quintuple harmonic signals are amplified while zero-sequence current signal fundamental waves are processed, the signal to noise ratio of the quintuple harmonics is improved, comprehensive data analysis is facilitated, mistaken selection and wrong selection are deceased, and line selection accuracy rate is improved. The data acquisition and processing system can simultaneously detect three output lines and provide a hardware environment for 'amplitude and phase comparing algorithm', 'quintuple harmonic algorithm' and other comprehensive line selection principles of a line mainframe, meanwhile improves the line selection effectiveness, facilitates line expansion, can be effectively resistant to electromagnetic interference through RS485 bus communication and is large in communication distance and simple in networking, the complexity of the system is reduced, cost is reduced, and the maintenance amount of the system is reduced. The data acquisition and processing system achieves synchronous data acquisition and transmission and is good in real-timeliness, quick in response, capable of achieving data pre-processing and high in anti-interference capacity.
Description
Technical field
The invention belongs to field of relay protection in power, be specifically related to a kind of data acquisition processing system for small current earthing wire-selecting.
Background technology
The power distribution network of China 6-35KV extensively adopts central point non-validity earthing mode, also known as small current neutral grounding system.Fault more than 70% in small current neutral grounding system belongs to singlephase earth fault.
Traditional line selection apparatus only has a route selection main frame, only com-parison and analysis is carried out to the first-harmonic of zero sequence current signal or 5 subharmonic, but the signal to noise ratio (S/N ratio) of 5 subharmonic in first-harmonic is very little, only account for about 3% of first-harmonic, be easy to be subject to noise jamming, effective integrated data cannot be carried out to zero sequence signal to compare, easily produce falsely drop, wrong choosing, route selection accuracy rate is on the low side.
Summary of the invention
The present invention proposes a kind of data acquisition processing system for small current earthing wire-selecting, solves the problem that in prior art, route selection accuracy rate is on the low side, for faulty line selection provides hardware environment, have real-time good, respond fast and anti-interference strong advantage.
Technical scheme of the present invention is achieved in that
For a data acquisition system (DAS) for small current earthing wire-selecting, this system comprises zero sequence current signal processing module, data-interface CAN module (40), single-chip microcomputer signal transacting module (50) and power conversion processing module (60);
Described monolithic signal transacting module (50) comprises backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restarts module, insulating power supply, debugging interface module and STM32 data processing module, described backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restart module, insulating power supply, debugging interface module output terminal be all connected with described STM32 data processing module;
Described zero sequence current signal process module is used for carrying out data acquisition and processing (DAP) to the first-harmonic of zero sequence current signal and 5 subharmonic, and the signal after process is transported to described STM32 data processing module;
Described data-interface CAN module (40) comprises CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module and signal isolation indicating module, the input end that described CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module isolate indicating module with signal is all connected+3V power supply, and the output terminal stating CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module and signal isolation indicating module is connected with described STM32 data processing module respectively;
Described power conversion processing module (60) comprises+12V power filter processing module ,+5V power supply module ,-5V power supply module and+3V3 power supply module, provides the power supply of+12V ,+5V ,+3V and-5V respectively.
Further, described zero sequence current signal processing module comprises first via zero sequence current signal processing module (30), the second road zero sequence current signal processing module (20) and the 3rd road zero sequence current signal processing module (10), described first via zero sequence current signal processing module (30), the second road zero sequence current signal processing module (20) are all connected with described single-chip microcomputer with the 3rd road zero sequence current signal processing module (10), and described single-chip microcomputer process module processes the signal that three road zero sequence current signal processing modules transmit simultaneously.
Further, described zero sequence current signal processing module comprises Current Mutual Inductance output signal processing module, power supply high-frequency signal filtering processing module, common mode and amplification and filters signal processing module, carries out signal quantum conversion module by Y=-0.3 (X+5), carries out signal quantum conversion module by Y=0.3 (X+5), 5 subharmonic carry out quantum conversion module by Y=-30X-1.5V, 5 subharmonic carry out quantum conversion module, band pass filter circuit and power supply processing module by Y=30X+1.5V
The output terminal of described Current Mutual Inductance output signal processing module connects described common mode and amplifies filtration signal processing module, the output terminal that signal processing module is filtered in described common mode and amplification connects the described input end carrying out signal quantum conversion module and described band pass filter circuit by Y=-0.3 (X+5) respectively, signal quantum conversion module is carried out by Y=0.3 (X+5) described in the described output terminal connection carrying out signal quantum conversion module by Y=-0.3 (X+5), the described output terminal carrying out signal quantum conversion module by Y=0.3 (X+5) connects described single-chip microcomputer signal transacting module,
The input end that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module, the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described 5 subharmonic to carry out quantum conversion module input end by Y=30X+1.5V, and the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module.
Further, described band pass filter circuit comprises wave filter and ratio Circuit tuning, and the band of described wave filter is led to input end and is all connected with the low pass input end of this wave filter by the resistance of two series connection; The band of described wave filter is led to output terminal and is also connected with the signal input part of this wave filter by the resistance of two series connection; The input end of described ratio Circuit tuning connects the output terminal of described Current Mutual Inductance output signal processing module, and the output terminal of described ratio Circuit tuning connects the signal input part of described wave filter.
Preferably, the model of described bandpass filter is MAX274, and the model of described STM32 data processing module is single-chip microcomputer STM32F103.
Further, described monolithic signal transacting module comprises backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restarts module, insulating power supply, debugging interface module and STM32 data processing module, and the terminals VBAT D of described backup battery module connects the terminals VBAT of described STM32 data processing module, terminals OSC32-OUT and the terminals OSC32-IN of described crystal oscillator module are connected terminals PC15-OSC32-OUT and the terminals PC14-OSC32-IN of described STM32 data processing module respectively, terminals OSC OUT and the terminals OSC IN of described crystal oscillator module are connected terminals PD1 and the terminals PD0 of described STM32 data processing module respectively, and the terminals BOOT0 of described crystal oscillator module connects described STM32 data processing module terminals BOOT0, described terminals NRST of restarting module connects the terminals NRST of described STM32 data processing module, the terminals LED of described state indicator module connects the terminals PB5 of described STM32 data processing module, terminals CANL and the terminals CANH of described debugging interface module are connected terminals CANL and the terminals CANH of described CAN data transmit-receive module respectively, the terminals PB4 of described debugging interface module, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13, terminals PA7 and terminals PA6 are connected the terminals PB4 of described STM32 data processing module respectively, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13-RTC, terminals PA7 and terminals PA6, terminals MCU3V3 and the terminals MCU-GND of described MCU power filter processing module are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively, terminals MCU 3V3 and the terminals MCU-GND of described buffer circuit are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively.
Further, the terminals CANH of described CAN data transmit-receive module is connected terminals CANH and the terminals CANL of described debugging interface module with terminals CANL, the terminals CAN TXD of described CAN data transmit-receive module is connected terminals PB8 and the terminals PB9 of described STM32 data processing module with terminals CAN RXD; Terminals UART1RX and the terminals UART1EN terminals UART1TX of described RS232 interface module are connected terminals PA10, terminals PA8 and the terminals PA9 of described STM32 data processing module respectively, described RS232 interface module; Terminals SPI CS, terminals SPI SO and the terminals NRST of described data memory module are connected terminals PB12, terminals PB14 and the connection jaws NRST of described STM32 data processing module respectively; Terminals SCL and the terminals SDA of described data memory module are connected terminals PB6 and the terminals PB7 of described STM32 data processing module respectively; Terminals K1, terminals K2 and the terminals K3 of described signal isolation module are connected terminals PB0, terminals PB1 and the terminals PB2 of described STM32 data processing module respectively.
Beneficial effect: the present invention carries out amplification process to 5 rd harmonic signal again while processing zero sequence current signal first-harmonic, and the signal to noise ratio (S/N ratio) that improve 5 subharmonic is conducive to the comprehensive analysis of data, reduces wrong choosing and falsely drops, improve route selection accuracy rate; The present invention can detect 3 outlet lines simultaneously, for faulty line selection principle such as " than amplitude ratio phase algorithm ", " 5 subharmonic algorithm " of line main frame provides hardware environment, improve the actual effect of whole system route selection simultaneously, facilitate the expansion of circuit, adopt RS485 bus communication can effective electromagnetism interference, communication distance be far away, networking is simple, the complexity of minimizing system, reduces costs, and reduces system maintenance amount.Synchronous data collection and transmission, real-time is good, and response is fast, and data prediction is by force anti-interference.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is system chart of the present invention.
Fig. 2 be in the 3rd road zero sequence current signal process module of the present invention current signal mutual inductance output signal processing module with common mode and amplify the circuit diagram filtering signal processing module and be connected.
Fig. 3 is the circuit diagram for fundamental signal range swithching in the 3rd road zero sequence current signal process module of the present invention.
Fig. 4 is the circuit diagram for 5 rd harmonic signal range swithching in the 3rd road zero sequence current signal process module of the present invention.
Fig. 5 is the circuit diagram of band pass filter circuit in the 3rd road zero sequence current signal process module of the present invention.
Fig. 6 be in the second road zero sequence current signal process module of the present invention current signal mutual inductance output signal processing module with common mode and amplify the circuit diagram filtering signal processing module and be connected.
Fig. 7 is the circuit diagram for fundamental signal range swithching in the second road zero sequence current signal process module of the present invention.
Fig. 8 is the circuit diagram for 5 rd harmonic signal range swithching in the second road zero sequence current signal process module of the present invention.
Fig. 9 is the circuit diagram of band pass filter circuit in the second road zero sequence current signal process module of the present invention.
Figure 10 be in first via zero sequence current signal process module of the present invention current signal mutual inductance output signal processing module with common mode and amplify the circuit diagram filtering signal processing module and be connected.
Figure 11 is the circuit diagram for fundamental signal range swithching in first via zero sequence current signal process module of the present invention.
Figure 12 is the circuit diagram for 5 rd harmonic signal range swithching in first via zero sequence current signal process module of the present invention.
Figure 13 is the circuit diagram of band pass filter circuit in first via zero sequence current signal process module of the present invention.
Figure 14 is the circuit diagram of CAN data transmit-receive module in electric data-interface CAN module of the present invention.
Figure 15 is the circuit diagram of data memory module in electric data-interface CAN module of the present invention.
Figure 15 and Figure 17 is the circuit diagram of data memory module in electric data-interface CAN module of the present invention.
Figure 16 is the circuit diagram of RS232 interface module in electric data-interface CAN module of the present invention.
Figure 18 is the circuit diagram of signal isolation indicating module in electric data-interface CAN module of the present invention.
Figure 19 is the circuit diagram of STM32 signal processing module of the present invention.
Figure 20 is the circuit diagram of the state indicator module in STM32 signal processing module of the present invention.
Figure 21 is the circuit diagram of the debugging interface module in STM32 signal processing module of the present invention.
Figure 22, Figure 23, Figure 24 and Figure 25 are respectively the little red+12V power filter processing module of power conversion processing module in the present invention ,+5V power supply module ,-5V power supply module and+3V3 power supply modular circuit figure.
10-the three road zero sequence current signal process module 20-the second road zero sequence current signal process module 2030-first via zero sequence current signal process module 40-data-interface CAN module 50-single-chip microcomputer signal transacting module 60-power conversion processing module
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
With reference to Fig. 1, a kind of data acquisition system (DAS) for small current earthing wire-selecting, this system comprises zero sequence current signal processing module, data-interface CAN module 40, single-chip microcomputer signal transacting module 50 and power conversion processing module 60, process 50HZ signal and 250HZ signal is obtained after the process of zero sequence current signal processing module, and 50HZ signal and 250HZ signal are transported to single-chip microcomputer signal transacting module 50 simultaneously, power conversion processing module 60 is single-chip microcomputer signal transacting module conveying+3V voltage, data-interface CAN module 40 connects single-chip microcomputer signal transacting module and carries out data transmission,
With reference to Fig. 2 to Figure 13, described zero sequence current signal processing module comprises first via zero sequence current signal processing module 30, second road zero sequence current signal processing module 20 and the 3rd road zero sequence current signal processing module 10, described first via zero sequence current signal processing module 30, second road zero sequence current signal processing module (20) is all connected with described single-chip microcomputer with the 3rd road zero sequence current signal processing module 10, and described single-chip microcomputer process module processes the signal that three road zero sequence current signal processing modules transmit simultaneously.
Described zero sequence current signal processing module comprises Current Mutual Inductance output signal processing module, power supply high-frequency signal filtering processing module, common mode and amplification and filters signal processing module, carries out signal quantum conversion module by Y=-0.3 (X+5), carries out signal quantum conversion module by Y=0.3 (X+5), 5 subharmonic carry out quantum conversion module by Y=-30X-1.5V, 5 subharmonic carry out quantum conversion module, band pass filter circuit and power supply processing module by Y=30X+1.5V
The output terminal of described Current Mutual Inductance output signal processing module connects described common mode and amplifies filtration signal processing module, the output terminal that signal processing module is filtered in described common mode and amplification connects the described input end carrying out signal quantum conversion module and described band pass filter circuit by Y=-0.3 (X+5) respectively, signal quantum conversion module is carried out by Y=0.3 (X+5) described in the described output terminal connection carrying out signal quantum conversion module by Y=-0.3 (X+5), the described output terminal carrying out signal quantum conversion module by Y=0.3 (X+5) connects described single-chip microcomputer signal transacting module,
The input end that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module, the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described 5 subharmonic to carry out quantum conversion module input end by Y=30X+1.5V, and the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module.
Described band pass filter circuit comprises wave filter and ratio Circuit tuning, and the band of described wave filter is led to input end and is all connected with the low pass input end of this wave filter by the resistance of two series connection; The band of described wave filter is led to output terminal and is also connected with the signal input part of this wave filter by the resistance of two series connection; The input end of described ratio Circuit tuning connects the output terminal of described Current Mutual Inductance output signal processing module, and the output terminal of described ratio Circuit tuning connects the signal input part of described wave filter;
The model of described bandpass filter is MAX274, and the model of described STM32 data processing module is single-chip microcomputer STM32F103.；
Terminals VS1_A_AD and the terminals VS1_5_AD of first via zero sequence current signal processing module are connected terminals PA5 and the terminals PA4 of single-chip microcomputer STM32F103 respectively;
Terminals VS2_A_AD and the terminals VS2_5_AD of the second road zero sequence current signal processing module are connected terminals PA3 and the terminals PA2 of single-chip microcomputer STM32F103 respectively;
Terminals VS3_A_AD and the terminals VS3_5_AD of the 3rd road zero sequence current signal processing module are connected terminals PA1 and the terminals PA0 of single-chip microcomputer STM32F103 respectively.
See shown in Figure 14 to 18, the terminals CANH of described CAN data transmit-receive module is connected terminals CANH and the terminals CANL of described debugging interface module with terminals CANL, the terminals CAN TXD of described CAN data transmit-receive module is connected terminals PB8 and the terminals PB9 of described STM32 data processing module with terminals CANRXD; Terminals UART1RX and the terminals UART1EN terminals UART1TX of described RS232 interface module are connected terminals PA10, terminals PA8 and the terminals PA9 of described STM32 data processing module respectively, described RS232 interface module; Terminals SPI CS, terminals SPI SO and the terminals NRST of described data memory module are connected terminals PB12, terminals PB14 and the connection jaws NRST of described STM32 data processing module respectively; Terminals SCL and the terminals SDA of described data memory module are connected terminals PB6 and the terminals PB7 of described STM32 data processing module respectively; Terminals K1, terminals K2 and the terminals K3 of described signal isolation module are connected terminals PB0, terminals PB1 and the terminals PB2 of described STM32 data processing module respectively.
See shown in Figure 19 to 21, described monolithic signal transacting module 50 comprises backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restarts module, insulating power supply, debugging interface module and STM32 data processing module, and the terminals VBAT D of described backup battery module connects the terminals VBAT of described STM32 data processing module, terminals OSC32-OUT and the terminals OSC32-IN of described crystal oscillator module are connected terminals PC15-OSC32-OUT and the terminals PC14-OSC32-IN of described STM32 data processing module respectively, terminals OSC OUT and the terminals OSC IN of described crystal oscillator module are connected terminals PD1 and the terminals PD0 of described STM32 data processing module respectively, and the terminals BOOT0 of described crystal oscillator module connects described STM32 data processing module terminals BOOT0, described terminals NRST of restarting module connects the terminals NRST of described STM32 data processing module, the terminals LED of described state indicator module connects the terminals PB5 of described STM32 data processing module, terminals CANL and the terminals CANH of described debugging interface module are connected terminals CANL and the terminals CANH of described CAN data transmit-receive module respectively, the terminals PB4 of described debugging interface module, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13, terminals PA7 and terminals PA6 are connected the terminals PB4 of described STM32 data processing module respectively, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13-RTC, terminals PA7 and terminals PA6, terminals MCU 3V3 and the terminals MCU-GND of described MCU power filter processing module are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively, terminals MCU 3V3 and the terminals MCU-GND of described buffer circuit are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively.
The terminals CANH of described CAN data transmit-receive module is connected terminals CANH and the terminals CANL of described debugging interface module with terminals CANL, the terminals CAN TXD of described CAN data transmit-receive module is connected terminals PB8 and the terminals PB9 of described STM32 data processing module with terminals CAN RXD; Terminals UART1RX and the terminals UART1EN terminals UART1TX of described RS232 interface module are connected terminals PA10, terminals PA8 and the terminals PA9 of described STM32 data processing module respectively, described RS232 interface module; Terminals SPI CS, terminals SPI SO and the terminals NRST of described data memory module are connected terminals PB12, terminals PB14 and the connection jaws NRST of described STM32 data processing module respectively; Terminals SCL and the terminals SDA of described data memory module are connected terminals PB6 and the terminals PB7 of described STM32 data processing module respectively; Terminals K1, terminals K2 and the terminals K3 of described signal isolation module are connected terminals PB0, terminals PB1 and the terminals PB2 of described STM32 data processing module respectively.
Shown in Figure 22, Figure 23, Figure 24 and Figure 25, described power conversion processing module 60 comprises+12V power filter processing module ,+5V power supply module ,-5V power supply module and+3V3 power supply module, provides the power supply of+12V ,+5V ,+3V and-5V respectively.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. for a data acquisition system (DAS) for small current earthing wire-selecting, it is characterized in that: this system comprises zero sequence current signal processing module, data-interface CAN module (40), single-chip microcomputer signal transacting module (50) and power conversion processing module (60);
Described monolithic signal transacting module (50) comprises backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restarts module, insulating power supply, debugging interface module and STM32 data processing module, described backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restart module, insulating power supply, debugging interface module output terminal be all connected with described STM32 data processing module;
Described zero sequence current signal process module is used for carrying out data acquisition and processing (DAP) to the first-harmonic of zero sequence current signal and 5 subharmonic, and the signal after process is transported to described STM32 data processing module;
Described data-interface CAN module (40) comprises CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module and signal isolation indicating module, the input end that described CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module isolate indicating module with signal is all connected+3V power supply, and the output terminal stating CAN data transmit-receive module, data-storage module, RS232 interface module, data memory module and signal isolation indicating module is connected with described STM32 data processing module respectively;
Described power conversion processing module (60) comprises+12V power filter processing module ,+5V power supply module ,-5V power supply module and+3V3 power supply module, provides the power supply of+12V ,+5V ,+3V and-5V respectively.
2. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 1, it is characterized in that: described zero sequence current signal processing module comprises first via zero sequence current signal processing module (30), second road zero sequence current signal processing module (20) and the 3rd road zero sequence current signal processing module (10), described first via zero sequence current signal processing module (30), second road zero sequence current signal processing module (20) is all connected with described single-chip microcomputer with the 3rd road zero sequence current signal processing module (10), described single-chip microcomputer process module processes the signal that three road zero sequence current signal processing modules transmit simultaneously.
3. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 2, it is characterized in that: described zero sequence current signal processing module comprises Current Mutual Inductance output signal processing module, power supply high-frequency signal filtering processing module, signal processing module is filtered in common mode and amplification, signal quantum conversion module is carried out by Y=-0.3 (X+5), signal quantum conversion module is carried out by Y=0.3 (X+5), 5 subharmonic carry out quantum conversion module by Y=-30X-1.5V, 5 subharmonic carry out quantum conversion module by Y=30X+1.5V, band pass filter circuit and power supply processing module,
The output terminal of described Current Mutual Inductance output signal processing module connects described common mode and amplifies filtration signal processing module, the output terminal that signal processing module is filtered in described common mode and amplification connects the described input end carrying out signal quantum conversion module and described band pass filter circuit by Y=-0.3 (X+5) respectively, signal quantum conversion module is carried out by Y=0.3 (X+5) described in the described output terminal connection carrying out signal quantum conversion module by Y=-0.3 (X+5), the described output terminal carrying out signal quantum conversion module by Y=0.3 (X+5) connects described single-chip microcomputer signal transacting module,
The input end that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module, the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described 5 subharmonic to carry out quantum conversion module input end by Y=30X+1.5V, and the output terminal that described 5 subharmonic carry out quantum conversion module by Y=30X+1.5V connects described single-chip microcomputer signal transacting module.
4. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 4, it is characterized in that: described band pass filter circuit comprises wave filter and ratio Circuit tuning, the band of described wave filter is led to input end and is all connected with the low pass input end of this wave filter by the resistance of two series connection; The band of described wave filter is led to output terminal and is also connected with the signal input part of this wave filter by the resistance of two series connection; The input end of described ratio Circuit tuning connects the output terminal of described Current Mutual Inductance output signal processing module, and the output terminal of described ratio Circuit tuning connects the signal input part of described wave filter.
5. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 3, it is characterized in that: the model of described bandpass filter is MAX274, the model of described STM32 data processing module is single-chip microcomputer STM32F103.
6. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 4, it is characterized in that: described monolithic signal transacting module (50) comprises backup battery module, buffer circuit, MCU power filter processing module, state indicator module, crystal oscillator module, restarts module, insulating power supply, debugging interface module and STM32 data processing module, and the terminals VBAT D of described backup battery module connects the terminals VBAT of described STM32 data processing module, terminals OSC32-OUT and the terminals OSC32-IN of described crystal oscillator module are connected terminals PC15-OSC32-OUT and the terminals PC14-OSC32-IN of described STM32 data processing module respectively, terminals OSC OUT and the terminals OSC IN of described crystal oscillator module are connected terminals PD1 and the terminals PD0 of described STM32 data processing module respectively, and the terminals BOOT0 of described crystal oscillator module connects described STM32 data processing module terminals BOOT0, described terminals NRST of restarting module connects the terminals NRST of described STM32 data processing module, the terminals LED of described state indicator module connects the terminals PB5 of described STM32 data processing module, terminals CANL and the terminals CANH of described debugging interface module are connected terminals CANL and the terminals CANH of described CAN data transmit-receive module respectively, the terminals PB4 of described debugging interface module, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13, terminals PA7 and terminals PA6 are connected the terminals PB4 of described STM32 data processing module respectively, terminals PB5, terminals PA15, terminals PB10, terminals PB11, terminals PA11, terminals PA12, terminals PC13-RTC, terminals PA7 and terminals PA6, terminals MCU 3V3 and the terminals MCU-GND of described MCU power filter processing module are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively, terminals MCU 3V3 and the terminals MCU-GND of described buffer circuit are connected terminals VDD and the terminals VSS of described STM32 data processing module respectively.
7. a kind of data acquisition system (DAS) for small current earthing wire-selecting as claimed in claim 5, it is characterized in that: the terminals CANH of described CAN data transmit-receive module is connected terminals CANH and the terminals CANL of described debugging interface module with terminals CANL, the terminals CAN TXD of described CAN data transmit-receive module is connected terminals PB8 and the terminals PB9 of described STM32 data processing module with terminals CAN RXD; Terminals UART1RX and the terminals UART1EN terminals UART1TX of described RS232 interface module are connected terminals PA10, terminals PA8 and the terminals PA9 of described STM32 data processing module respectively, described RS232 interface module; Terminals SPI CS, terminals SPI SO and the terminals NRST of described data memory module are connected terminals PB12, terminals PB14 and the connection jaws NRST of described STM32 data processing module respectively; Terminals SCL and the terminals SDA of described data memory module are connected terminals PB6 and the terminals PB7 of described STM32 data processing module respectively; Terminals K1, terminals K2 and the terminals K3 of described signal isolation module are connected terminals PB0, terminals PB1 and the terminals PB2 of described STM32 data processing module respectively.
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| CN104993806A (en) * | 2015-08-14 | 2015-10-21 | 中国兵器工业集团第二一四研究所苏州研发中心 | Programmable active band-pass filter and amplification circuit |
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