CN111650868A - Micro-power consumption multifunctional integrated data acquisition unit - Google Patents
Micro-power consumption multifunctional integrated data acquisition unit Download PDFInfo
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Abstract
The invention discloses a micro-power consumption multifunctional integrated data acquisition unit with high integration level, convenient replacement, maintenance and installation and high protection level, which comprises a micro-power consumption data acquisition unit, an analog signal expansion module and an RS485 signal expansion module, wherein the micro-power consumption data acquisition unit is used for cascading the analog signal expansion module and the RS485 signal expansion module through an IDC grey flat cable and an IDC socket and charging a lithium battery through a 10W/18V solar panel; the micro-power consumption data acquisition unit switches the 4-20 mA signal conditioning module and the +/-10V voltage signal conditioning module through the signal switch to realize the function that one channel can measure various physical quantities; the RS485 protection circuit interface is communicated with the non-isolated RS485 internal interface of the micro-power consumption data acquisition unit through an RS485 signal common mode filter; the microcontroller is communicated with the cloud server through the full-isolation RS485 external interface and the DTU data transmission module.
Description
Technical Field
The invention relates to the field of civil engineering, is applied to the industry of structural safety and health monitoring, and particularly relates to a micro-power-consumption multifunctional integrated data acquisition unit.
Background
In addition to the need of deploying health monitoring systems for very long and large bridges in recent two years, the health monitoring needs of many small and medium bridges in cities and provinces are increased, and on the one hand, the small and medium bridges belong to bridges which are easy to ignore or even maintain dead zones. On the other hand, medium and small bridges are numerous in number and distributed dispersedly, and the cost of a complete monitoring system is hard to bear, so that a targeted solution or a functional modularized solution of the medium and small bridges can be a solution which is more in line with the actual situation at present.
The existing solutions for medium and small bridges mainly have the following problems:
1. the collection equipment function singleness, overall dimension is big, the external dispersion of power supply, if assemble the collection box, because the combination leads to the protective housing bulky, the box internal layout is difficult to standardize the standard unified, and product production must assemble the collection protective housing temporarily according to the project difference at every turn, and the supply of material is inefficient, and the quality is difficult to the accuse.
2. The integrated transmission adopts a centralized mode, the construction and wiring distance is too large, the construction on some slightly-long bridges is too complicated, the efficiency is not high, and the centralized mode can also cause the failure of the whole system due to the DTU or the power supply problem.
3. The data acquisition module is difficult to replace and test; mainly embodied in the in-process of product later maintenance, when needing to be changed collection module, dismantle with the installation very difficult, brought very big difficulty for on-the-spot technical staff. Meanwhile, the field test and the sensor wiring are very inconvenient, and the field test needs to carry a computer or lead remote network on-line personnel to assist in checking data, so that unnecessary steps are added.
4. The data acquisition module has low integration level, large volume and single function; the layout of the modules in the current data acquisition box is not reasonable, unnecessary space is wasted, the size of the acquisition box is large, and the function is single.
5. When the data acquisition instrument has a problem, the whole acquisition equipment basically needs to be replaced, and the convenience condition of field maintenance and test is avoided; when the acquisition equipment needs to be replaced, the field equipment is replaced by the whole equipment, and the equipment storage and the equipment information are refreshed after replacement, so that the system maintenance cost is increased.
6. The wiring arrangement in the data acquisition box is not standard, and the debugging is difficult; walk the line confusion, lead to the cable to connect the mistake easily and also bring certain puzzlement for the staff of working a telephone switchboard.
7. The production and assembly processes of the data acquisition box are complicated; the production process of the collection box is complex, unnecessary manpower and material resources are consumed, and more repetitive test works are required.
8. The data acquisition box is waterproof, dustproof, dampproofing, the lightning protection effect is poor.
9. And the method has no fault self-diagnosis, and is inconvenient for technicians to troubleshoot problems. The current product test and problem judgment completely depend on the active investigation of testers, the requirement on the testers is too high, and the human-computer interaction is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to the practical requirements and provide a micro-power-consumption multifunctional integrated data acquisition unit which has high integration level, is convenient to replace, maintain and install and has high protection level.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a micro-power-consumption multifunctional integrated data acquisition unit is designed, and comprises a micro-power-consumption data acquisition unit, an analog signal expansion module, an RS485 signal expansion module, an IDC grey wire, an IDC socket, a lithium battery, a DTU data transmission module, a switching power supply, an antenna, a 10W/18V solar cell panel, a signal switch, a 4-20 mA signal conditioning module, a +/-10V voltage signal conditioning module, an instrument amplifier, an excitation module, a constant current source excitation module, a power frequency filter, an anti-aliasing filter, an analog-to-digital converter, a microcontroller, an RTC real-time clock, an EEPROM, an Ethernet interface, a USB interface, a fully-isolated RS485 external interface, a non-isolated RS485 internal interface, an I2C protection circuit, a power management module, a lithium battery management module, a power state monitoring module, an external power supply anti-surge interface, an anti-surge signal interface, an LED channel state indicator lamp, IO expander, multiplexer, external circuit protection interface, RS485 protection circuit interface, DC-DC isolation power supply.
The micro-power consumption data acquisition unit cascades the analog signal expansion module and the RS485 signal expansion module through an IDC grey flat cable and an IDC socket, and charges the lithium battery through a 10W/18V solar panel; the micro-power consumption data acquisition unit switches the 4-20 mA signal conditioning module and the +/-10V voltage signal conditioning module through the signal switch to realize the function that one channel can measure various physical quantities; the RS485 protection circuit interface is communicated with the non-isolated RS485 internal interface of the micro-power consumption data acquisition unit through an RS485 signal common mode filter; the microcontroller is communicated with the cloud server through the full-isolation RS485 external interface and the DTU data transmission module.
The excitation module provides power for an external 4-20 mA type sensor, conditions through the 4-20 mA signal conditioning module, and collects through the analog-to-digital converter.
The microcontroller realizes the measurement of external voltage signals through a signal switch, performs voltage conversion through an internal +/-10V voltage signal conditioning module, and acquires the voltage signals through an analog-to-digital converter.
The vibrating wire sensor is connected with the instrument amplifier through an anti-surge signal interface and a signal switch after being switched, and is sent to the analog-to-digital converter for collection after being conditioned through the power frequency filter and the anti-aliasing filter.
The microcontroller performs low power consumption management on the external equipment through an electronic switch in the power management module.
The invention has the beneficial effects that:
the micro-power-consumption multifunctional integrated data acquisition unit provided by the design can improve the survival capability of the equipment in the severe environment in the field. Meanwhile, the acquisition unit can be compatible with measurement of various physical quantities, the vibrating wire signal, the voltage signal and the 4-20 mA current signal are analog signal acquisition boards, one channel can be configured through functions, switching measurement of the vibrating wire signal, the voltage signal and the 4-20 mA current signal is achieved, and flexibility and combinability of the system are greatly improved. The RS485 signal is a fully isolated digital signal acquisition board independently, and all types of sensors with RS485 interfaces can be compatible. Therefore, the function of a single acquisition unit is very rich and flexible, compared with the current data acquisition unit with single function, the invention greatly optimizes the cost performance of the system, realizes more functions and smaller volume and reliability at the lowest cost, and is very suitable for quick deployment and implementation of a light-weight system.
The invention solves the problems of difficult system integration, complex system, large volume, sensor integration of different manufacturers, difficult system maintenance, high cost and the like when measuring different physical quantity monitoring objects in the current engineering application. The system only needs one data acquisition unit, the measurement of various physical quantity sensors can be realized, meanwhile, the requirement on an external power supply is not high, the system is suitable for being applied to a scene that commercial power cannot be provided, the acquisition modules (analog signals and RS485 signals) of different types of physical quantities are integrated in one data acquisition unit, the integration level of the system is greatly improved, the cost (implementation and maintenance) is greatly reduced, meanwhile, each acquisition module can be mixed, the measurement of three physical quantity signals can be realized through configuration on the same channel of the analog signal acquisition module, the flexibility of the system is greatly improved, a reliable low-cost scheme is provided for realizing a light and small integrated system, and the market competitiveness and the applicability of the system are improved.
Drawings
FIG. 1 is a block diagram of a micro-power multifunctional data acquisition unit of the present invention;
FIG. 2 is an electrical schematic block diagram of a micro-power consumption data collector in the present invention;
FIG. 3 is a block diagram of an analog signal expansion module of the present invention;
FIG. 4 is a block diagram of an S485 signal expansion module according to the present invention;
FIG. 5 is a schematic diagram of a voltage signal measuring circuit inside the micro-power consumption data collector in the present invention;
FIG. 6 is a schematic diagram of a 4-20 mA current signal measuring circuit inside the micro-power consumption data collector in the invention;
FIG. 7 is a schematic diagram of an internal DC-DC conversion circuit of the micro-power consumption data collector in the present invention;
FIG. 8 is a schematic diagram of a power state monitoring circuit module inside the micro-power consumption data collector in the present invention;
FIG. 9 is a schematic diagram of an IO extender of an I2C interface of an analog signal extension module and an RS485 signal extension module according to the present invention;
FIG. 10 is a schematic diagram of an isolated power supply built in an RS485 signal expansion module according to the present invention;
FIG. 11 is a schematic diagram of an excitation module inside the micro-power consumption data collector in the present invention;
fig. 12 is a schematic diagram of a signal and ground circuit of the micro-power consumption data collector and the analog signal expansion module in the present invention;
fig. 13 is a schematic diagram of a signal and ground circuit of the micro-power consumption data collector and the RS485 signal expansion module in the present invention;
fig. 14 is a logic block diagram of low power consumption of the micro-power multifunctional integrated data acquisition unit in the present invention.
In the figure:
1. a micro-power consumption data acquisition unit; 2. an analog signal expansion module; 3. an RS485 signal expansion module; 4. IDC gray flat cable; 5. an IDC jack; 6. a lithium battery; 7. a DTU data transmission module; 8. a switching power supply; 9. an antenna; 10. a 10W/18V solar panel;
11. a signal switch; 12. a 4-20 mA signal conditioning module; 13. a +/-10V voltage signal conditioning module; 14. an instrumentation amplifier; 15. an excitation module; 16. a constant current source excitation module 17 and a power frequency filter; 18. a low-pass filter; 19. an analog-to-digital converter; 20. a microcontroller;
21. an RTC real-time clock; 22. an EEPROM; 23. an Ethernet interface; 24. a USB interface; 25. a fully-isolated RS485 external interface; 26. a non-isolated RS485 internal interface; 27. I2C protection circuit; 28. a power management module; 29. a lithium battery management module; 30. a power state monitoring module;
31. an external power supply anti-surge interface; 32. a lithium battery (the same as the lithium battery (6) in fig. 1); 33. an IDC interface of the micro-power consumption data acquisition unit;
34. an analog signal expansion module IDC jack; 35. I2C protection circuit; 36. an LED channel status indicator light; 37. an IO expander; 38. a signal relay group; 39. an anti-surge signal interface; 40. an RS485 signal expansion module IDC socket;
41. I2C protection circuit; 42. an LED channel status indicator light; 43. an RS485 signal common mode filter; 44. an IO expander; 45. a multiplexer; 46. an external power protection interface; 47. an RS485 protection circuit interface; 48. a DC-DC isolated power supply.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
example 1: a micro-power multifunctional integrated data acquisition unit, see fig. 1 to 14.
The device comprises a micro-power consumption data acquisition unit 1, an analog signal expansion module 2, an RS485 signal expansion module 3, an IDC gray line 4, an IDC socket 5, a lithium battery 6, a DTU data transmission module 7, a switching power supply 8, an antenna 9, a 10W/18V solar cell panel 10, a signal switch 11, a 4-20 mA signal conditioning module 12, a +/-10V voltage signal conditioning module 13, an instrument amplifier 14, an excitation module 15, a constant current source excitation module 16, a power frequency filter 17, an anti-aliasing filter 18, an analog-to-digital converter 19, a microcontroller 20, an RTC real-time clock 21, an EEPROM22, an Ethernet interface 23, a USB interface 24, a fully-isolated RS485 external interface 25, a non-isolated RS485 internal interface 26, an I2C protection circuit 27, a power management module 28, a lithium battery management module 29, a power state monitoring module 30, an external power supply anti-surge interface 31, an anti-surge signal interface 39, an LED channel state indicator, The device comprises an RS485 signal common mode filter 43, an IO expander 44, a multiplexer 45, an external circuit protection interface 46, an RS485 protection circuit interface 47 and a DC-DC isolation power supply 48.
The micro-power consumption data acquisition unit 1 is used for cascading the analog signal expansion module 2 and the RS485 signal expansion module 3 through the IDC gray cable 4 and the IDC socket 5, and charging the lithium battery 6 through the 10W/18V solar panel 10; the micro-power consumption data acquisition unit 1 switches the 4-20 mA signal conditioning module 12 and the +/-10V voltage signal conditioning module 13 through the signal switch 11 to realize the function that one channel can measure various physical quantities; the RS485 protection circuit interface 47 communicates with the non-isolated RS485 internal interface 26 of the micro-power consumption data acquisition unit 1 through the RS485 signal common mode filter 43; the microcontroller 20 communicates with the cloud server through the fully-isolated RS485 external interface 25 and the DTU data transmission module 7.
The excitation module 15 provides power for the external 4-20 mA type sensor, conditions through the 4-20 mA signal conditioning module 12, and collects through the analog-to-digital converter 19.
The microcontroller 20 realizes measurement of external voltage signals through the signal switch 11, performs voltage conversion through the internal +/-10V voltage signal conditioning module 13, and acquires the voltage signals through the analog-to-digital converter 19.
The vibrating wire sensor is connected with the instrument amplifier 14 after being switched by the signal switch 11 through the anti-surge signal interface 39, conditioned by the power frequency filter 17 and the anti-aliasing filter 18 and then sent to the analog-to-digital converter 19 for collection.
More specifically, the whole system is composed of a micro-power consumption data collector, an analog signal expansion module and an RS485 signal expansion module, wherein the analog signal expansion module and the RS485 signal expansion module are used as data collection daughter boards, a power supply is uniformly provided by the micro-power consumption data collector, and meanwhile, the channel switching logic control of the two sub-modules of the analog signal expansion module and the RS485 signal expansion module is also communication control through I2C of the micro-power consumption data collector.
As shown in fig. 1, the micropower data collector, the analog signal expansion module and the RS485 signal expansion module are cascaded through an IDC grey cable through an IDC socket, one system is composed of 1 micropower data collector and 8 analog signal expansion modules or RS485 signal expansion modules, wherein the analog signal expansion modules and the RS485 signal expansion modules can be mixed and matched, but the total number of the analog signal expansion modules cannot exceed 8, and meanwhile, the 8 modules set the address of the module through a three-position dial switch on each module. Three physical quantities of the analog signal expansion module are as follows: the vibrating wire signal, the voltage signal and the 4-20 mA current signal realize the arbitrary configuration of the three signals through an internal signal switching circuit. And the micro-power consumption data acquisition unit performs data interaction with the DTU data transmission module through an external RS485 interface.
The DTU data transmission module is in data communication with the cloud service center through a 3G/4G wireless network, receives a control acquisition command from the cloud platform and realizes remote online monitoring. The internal lithium battery serves as a main energy supply component, and the solar cell panel charges the lithium battery. The whole system realizes micro-power operation under the management of the micro-power data acquisition unit. The switching power supply 8 is provided as a backup power supply input in the case of mains supply.
To above-mentioned little consumption data collection station, analog signal extension module, RS485 signal extension module, wherein:
firstly, a micro-power consumption data acquisition unit: the micro-power consumption data acquisition unit is used as a control center of the whole data acquisition unit and plays the following roles: signal data acquisition, conditioning, conversion, communication, low power consumption control and the like. Wherein RS485 communication divides two parts, one is communicated with the cloud service center through DTU data transmission module with the outside, another is inside this system, an interface for communicate with RS485 signal extension module, mainly be responsible for and communicate with RS485 type sensor, two RS485 interfaces are through realizing data link at microcontroller, before data link, microcontroller can be through the unified standard protocol that converts into of sensor of the different communication protocol of outside through the procedure again through the external interface of full isolation RS485 with the cloud center communication, alleviate the pressure of the protocol processing of cloud server side.
The constant current source excitation module 16 supplies an excitation source to the external thermistor type temperature sensor, and realizes measurement of the thermistor type temperature sensor.
The 4-20 mA signal conditioning module 12 and the +/-voltage signal conditioning module 13 condition signals of external analog signals 4-20 mA type and voltage type sensors to a voltage range which can be measured by an analog-to-digital converter.
The analog-to-digital converter is provided with a plurality of input interfaces and can process unipolar single-ended signals and unipolar differential signals, wherein vibrating wire signals, external voltage and current sensor signals and signals of a power supply state monitoring module on the single board are all mounted on the same analog-to-digital converter.
Low power consumption control of the entire system as shown in fig. 14, all peripheral devices of the entire system except the microcontroller include: the analog circuit part, the excitation power supply, part of digital circuits (Ethernet, USB, RS485, RTC and EEPROM), the analog signal expansion module and the RS485 signal expansion module are controlled by internal electronic switches, power consumption control requirements are preset in a microcontroller program in advance according to different power consumption levels, the power supply of related circuits is started when the microcontroller works, and the microcontroller is turned off after the work is finished.
The general system works at the granularity of equal-interval collection, for example, data is collected once in half an hour, so that after the collection is completed, the whole system enters a sleep mode, including that the microcontroller 20 also enters the sleep mode, so that the whole system enters low power consumption, and at the moment, the external solar panel charges the lithium battery at the maximum efficiency through the lithium battery management module (of course, when the system works, the solar panel also provides energy for the lithium battery and the system). Because the signal chain of the system is only one, the front end realizes the connection and disconnection of different signals and a rear-stage signal conditioning circuit through the logic switching of a signal switch. The I2C interface is used for the microcontroller to communicate with the IO expander on the analog signal expansion module and the RS485 signal expansion module, and is used for gating and opening the tested channel to connect with the signal chain, so as to realize channel expansion.
And the analog signal expansion module is electrically connected with the micro-power consumption data acquisition unit through the IDC socket and receives the power supply and the communication signal provided by the micro-power consumption data acquisition unit. And the IO expander on the single board drives the signal relay to gate and turn off the connection of the external sensor. Each path of signal interface is provided with an anti-surge protection circuit, so that the protection capability of the system is improved. Each channel is provided with an LED channel state indicator lamp for displaying the working state of the channel connecting sensor.
And the RS485 signal expansion module is electrically connected with the micro-power consumption data acquisition unit through the IDC socket and receives the power supply and the communication signal provided by the micro-power consumption data acquisition unit. The IO extender on the board drives the multiplexer 45 to gate and gate off the connection of the external sensor. And the RS485 common mode filter is used for improving the signal quality output by the external RS485 type sensor. Each path of signal interface is provided with an anti-surge protection circuit, so that the protection capability of the system is improved. Each channel is provided with an LED channel state indicator lamp for displaying the working state of the channel connecting sensor. Because the RS485 signal expansion module needs to provide power for an external RS485 type sensor, a DC-DC isolation power supply is configured on the single board.
In this embodiment, the microcontroller 20 adopts an STM32F107 serial processor of ST corporation, and has driving capabilities of USB and ethernet interfaces. The analog-to-digital converter 19 adopts a 4-channel fully differential/8-channel single-ended, 250Ksps, 16bit type analog-to-digital converter of AD7689 series of ADI company, and has extremely low power consumption of 3.5 mW. The instrumentation amplifier 14 uses AD8422 from ADI corporation to achieve 100-fold gain amplification of the vibrating wire signal. The I2C protection circuit 27 is used to protect the I2C interface from damage during module plugging and unplugging by using a three-terminal filter and ESD protection period to constitute a protection circuit. The fully-isolated RS485 external interface 25 adopts an ADM2587 fully-isolated RS485 driver of ADI company, and an isolation power supply is integrated inside the fully-isolated RS485 external interface except for RS485 signal isolation, so that the configuration of an external isolation power supply is omitted, and the fully-isolated RS485 external interface is communicated with an external DTU or RS485 bus, so that the protection capability of the fully-isolated RS485 external interface is improved by using a fully-isolated model.
The non-isolated RS485 internal interface 26 is an interface for communicating with the RS485 signal extension module, and because the internal interface is adopted, the requirement on the protection capability is not very high, and a full-isolation type interface is not needed, an RS485 driver of an SN65HVD72 model of TI company is adopted. The power state monitoring module 30 is connected to the analog-to-digital converter through resistance voltage division, operational amplifier buffering and certain overvoltage protection measures, and judges the current system power supply operation condition of the system through monitoring voltage. If the electric quantity of the system is low or the external power supply is suddenly powered off, the system can report the corresponding power supply information to the cloud server as diagnosis information so as to timely send out early warning.
The lithium battery management module 29 adopts a MAX1873 chip of meixin corporation to realize the charging management of the 7.4V lithium battery, the chip can receive an external direct current power supply provided by the switching power supply 8 and also can receive a power supply provided by the external 10W/18V solar cell panel 10, when the MAX1873 works in the low power consumption mode, the current consumption of the chip is less than 10uA, and the system is very suitable for the low power consumption requirement of the system.
In the analog signal expansion module, the IO expander employs TCA9535 of TI corporation, having a 16-bit logical IO output, meaning that control of a maximum of 16 channels is supported. The annunciator relay adopts an ohm dragon G6K series patch type signal relay.
In the RS485 signal expansion module, the IO expander adopts TCA9535 of TI corporation, has 16-bit logic IO output, and means that control of 16 channels is supported at maximum. The multiplexer can adopt two ADGS5414 of ADI company, and each chip has 8-channel signal on-off control function. Because this veneer need provide the power to the outside, in order to improve the ability that the system protected outside anomaly, this power adopts the isolation power, and the model can select golden sun rise technology's WRB1212S model isolation power, realizes the power isolation of system side and external sensor side.
Each of the above circuits is described with reference to fig. 5 to 14.
In fig. 1, the analog signal expansion module and the RS485 signal expansion module can be mixed, each expansion module is provided with two IDC sockets with pins connected to the pins one by one, the electrical characteristics and definitions of the two sockets are completely the same, that is, the two sockets are directly connected together by routing wires on a PCB inside the expansion module, so that the expansion module can be conveniently cascaded by IDC gray wires when being cascaded. The switching power supply is used for taking electricity from the outside when the system is in a scene with mains supply, and is equivalent to a standby power supply.
In fig. 2, when the whole system works in a scene with commercial power, the external power supply anti-surge interface 31 supplies power to the system, and simultaneously charges the internal lithium battery, and when the system is powered off unexpectedly, the system automatically switches to the internal lithium battery 32 through the internal lithium battery management module 29 to supply power to the system. If the system working environment has no commercial power, the external power supply of the system is supplied by the 10W/18V solar panel 10.
In fig. 3, the signal relay group 38 is composed of a plurality of signal relays, and each signal relay corresponds to one sensor channel. The anti-surge signal interface 39 is composed of a two-stage surge protection circuit, which is generally a combination of GDT and TVS.
In fig. 4, the LED channel status indicator 42 is used for indicating the current display of information such as on, off, and operation mode of the channel sensor, as in the analog signal expansion module, and is distinguished by the cycle difference of the intermittent blinking of the LED lamp. The DC-DC isolation power supply 48 is used to provide an isolated power supply for the external RS485 type sensor.
FIG. 5 shows a voltage signal measurement circuit inside the micro-power consumption data collector, which can measure the external + -10V voltage signal range and condition the voltage signal range to 0-5V range suitable for the measurement of the analog-to-digital converter.
FIG. 6 shows a 4-20 mA current signal measuring circuit inside the micro-power consumption data collector, which is used for converting a current signal into a voltage signal range suitable for measurement by an analog-to-digital converter.
Fig. 7 is a DC-DC conversion circuit inside the micro-power consumption data collector, which is used to convert an external 12V coarse power supply to obtain a 5V accurate power supply, and the DC-DC can ensure higher conversion efficiency.
Fig. 8 is a circuit module for monitoring the power supply state of the micro-power consumption data collector, which is used for monitoring the power supply state of the system, and comprises: when the voltage of a BAT _ Vol pin is less than 1.2V, no external power supply is correspondingly supplied, and the electric quantity of an internal lithium battery is low; when the voltage of the BAT _ Vol pin is between 1.4 and 2.2V, no external power supply is used for supplying power, but the electric quantity of a lithium battery is sufficient; and thirdly, when the voltage of the BAT _ Vol pin is more than 2.2V, the system is powered by an external power supply (mains supply).
Fig. 9 is an IO extender of the I2C interface of the analog signal extension module and the RS485 signal extension module, for driving the LED channel status indicator light, and controlling the on and off of the signal (analog, RS485) channel. The SW1 is a dial switch used for selecting module addresses of each analog signal extension module and each RS485 signal extension module.
Fig. 10 is an isolated power supply built into the RS485 signal expansion module for providing power to an external RS85 type sensor. RT1 and RT2 are self-recovery fuses for cutting off power supply in time when an external power supply is abnormally short-circuited, and for re-connecting the self-recovery fuses after the abnormality disappears.
FIG. 11 shows an excitation module inside the micro-power consumption data acquisition unit, which has two functions, one is to provide excitation voltage for measuring vibrating wire signals, and the other is to provide power for measuring external 4-20 mA type sensors.
Fig. 12 is a schematic diagram of signal and ground loops of the micro power consumption data collector and the analog signal expansion module, which is used for explaining the electrical connection relationship between the system ground (digital DGND), the guard ground and the shielding ground of the system.
Fig. 13 is a schematic diagram of signal and ground loops of the micro-power consumption data collector and the RS485 signal extension module, which is used to illustrate the electrical connection relationship between the system ground (digital DGND), the guard ground, and the shielding ground of the system.
FIG. 14 is a logic block diagram of the low power consumption of the micro-power multifunctional integrated data acquisition unit, showing which modules are powered off and which are powered on during low power consumption and normal mode operation of the overall system. Switch in the figure represents an electronic Switch, and is controlled to be turned on and off by MCU logic signals. Each module identifies, in addition to the quiescent current and the load current, an estimate of the total power consumption of the system.
In summary, the micro-power multifunctional integrated data acquisition unit provided by the design can improve the survival capability of the equipment in the field severe environment. Meanwhile, the acquisition unit can be compatible with measurement of various physical quantities, the vibrating wire signal, the voltage signal and the 4-20 mA current signal are analog signal acquisition boards, one channel can be configured through functions, switching measurement of the vibrating wire signal, the voltage signal and the 4-20 mA current signal is achieved, and flexibility and combinability of the system are greatly improved. The RS485 signal is a fully isolated digital signal acquisition board independently, and all types of sensors with RS485 interfaces can be compatible. Therefore, the function of a single acquisition unit is very rich and flexible, compared with the current data acquisition unit with single function, the invention greatly optimizes the cost performance of the system, realizes more functions and smaller volume and reliability at the lowest cost, and is very suitable for quick deployment and implementation of a light-weight system.
The invention solves the problems of difficult system integration, complex system, large volume, sensor integration of different manufacturers, difficult system maintenance, high cost and the like when measuring different physical quantity monitoring objects in the current engineering application. The system only needs one data acquisition unit, the measurement of various physical quantity sensors can be realized, meanwhile, the requirement on an external power supply is not high, the system is suitable for being applied to a scene that commercial power cannot be provided, the acquisition modules (analog signals and RS485 signals) of different types of physical quantities are integrated in one data acquisition unit, the integration level of the system is greatly improved, the cost (implementation and maintenance) is greatly reduced, meanwhile, each acquisition module can be mixed, the measurement of three physical quantity signals can be realized through configuration on the same channel of the analog signal acquisition module, the flexibility of the system is greatly improved, a reliable low-cost scheme is provided for realizing a light and small integrated system, and the market competitiveness and the applicability of the system are improved.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (5)
1. A micro-power-consumption multifunctional integrated data acquisition unit comprises a micro-power-consumption data acquisition unit (1), an analog signal expansion module (2), an RS485 signal expansion module (3), an IDC gray flat cable (4), an IDC socket (5), a lithium battery (6), a DTU data transmission module (7), a switching power supply (8), an antenna (9), a 10W/18V solar cell panel (10), a signal switch (11), a 4-20 mA signal conditioning module (12), a +/-10V voltage signal conditioning module (13), an instrumentation amplifier (14), an excitation module (15), a constant current source excitation module (16), a power frequency filter (17), an anti-aliasing filter (18), an analog-to-digital converter (19), a microcontroller (20), an RTC real-time clock (21), an EEPROM (22), an Ethernet interface (23), a USB interface (24), a full-isolation RS485 external interface (25), The device comprises a non-isolated RS485 internal interface (26), an I2C protection circuit (27), a power management module (28), a lithium battery management module (29), a power state monitoring module (30), an external power supply anti-surge interface (31), an anti-surge signal interface (39), an LED channel state indicator lamp (42), an RS485 signal common mode filter (43), an IO expander (44), a multiplexer (45), an external circuit protection interface (46), an RS485 protection circuit interface (47) and a DC-DC isolation power supply (48);
the method is characterized in that: the micro-power consumption data acquisition unit (1) cascades the analog signal expansion module (2) and the RS485 signal expansion module (3) through an IDC grey flat cable (4) and an IDC socket (5), and charges the lithium battery (6) through a 10W/18V solar panel (10); the micro-power consumption data acquisition unit (1) switches the 4-20 mA signal conditioning module (12) and the +/-10V voltage signal conditioning module (13) through the signal switch (11) to realize the function that one channel can measure various physical quantities; the RS485 protection circuit interface (47) is communicated with the non-isolated RS485 internal interface (26) of the micro-power consumption data acquisition unit (1) through an RS485 signal common mode filter (43); the microcontroller (20) is communicated with the cloud server through the full-isolation RS485 external interface (25) and the DTU data transmission module (7).
2. The micro-power multifunctional integrated data acquisition unit according to claim 1, characterized in that: the excitation module (15) provides power for the external 4-20 mA type sensor, conditions through the 4-20 mA signal conditioning module (12), and collects through the analog-to-digital converter (19).
3. The micro-power multifunctional integrated data acquisition unit according to claim 1, characterized in that: the microcontroller (20) realizes measurement of external voltage signals through the signal switch (11), performs voltage conversion through the internal +/-10V voltage signal conditioning module (13), and acquires the voltage signals through the analog-to-digital converter (19).
4. The micro-power multifunctional integrated data acquisition unit according to claim 1, characterized in that: the vibrating wire sensor is connected with an instrument amplifier (14) after being switched by a signal switch (11) through an anti-surge signal interface (39), conditioned by a power frequency filter (17) and an anti-aliasing filter (18) and then sent to an analog-to-digital converter (19) for collection.
5. The micro-power multifunctional integrated data acquisition unit according to claim 1, characterized in that: the microcontroller (20) performs low power consumption management on the external equipment through an electronic switch in the power management module (28).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624517A (en) * | 2022-03-09 | 2022-06-14 | 国家海洋技术中心 | General resistance, voltage and frequency signal acquisition module |
| CN115877766A (en) * | 2022-12-09 | 2023-03-31 | 重庆川仪自动化股份有限公司 | Analog output equipment |
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| CN106646056A (en) * | 2016-12-29 | 2017-05-10 | 江西飞尚科技有限公司 | Signal collection circuit and method for single-lithium-battery power supply |
| CN110888370A (en) * | 2019-12-06 | 2020-03-17 | 江苏摩立特科技有限公司 | Micro-power consumption multifunctional integrated data acquisition unit |
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| CN106646056A (en) * | 2016-12-29 | 2017-05-10 | 江西飞尚科技有限公司 | Signal collection circuit and method for single-lithium-battery power supply |
| CN110888370A (en) * | 2019-12-06 | 2020-03-17 | 江苏摩立特科技有限公司 | Micro-power consumption multifunctional integrated data acquisition unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114624517A (en) * | 2022-03-09 | 2022-06-14 | 国家海洋技术中心 | General resistance, voltage and frequency signal acquisition module |
| CN115877766A (en) * | 2022-12-09 | 2023-03-31 | 重庆川仪自动化股份有限公司 | Analog output equipment |
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Application publication date: 20200911 |