CN2935221Y - Remote monitoring and controlling element apparatus with electrical energy collection function - Google Patents
Remote monitoring and controlling element apparatus with electrical energy collection function Download PDFInfo
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- CN2935221Y CN2935221Y CN 200620119046 CN200620119046U CN2935221Y CN 2935221 Y CN2935221 Y CN 2935221Y CN 200620119046 CN200620119046 CN 200620119046 CN 200620119046 U CN200620119046 U CN 200620119046U CN 2935221 Y CN2935221 Y CN 2935221Y
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Abstract
The utility model disclosing a remote monitor and control unit having the function of energy collection is characterized in that the utility can connect the ac voltage signal and the ac current signal of the site under control, calculate the effective power and the reactive power; the utility can carry out real-time data transmission based on CAN-bus and 485-bus. The control circuit of the utility utilizes a DSP having powerful calculating ability and consists of an AC signal collecting circuit, an analog signal procession circuit, an analog input and procession circuit, an A/D conversion circuit, a switch signal input circuit, a switch signal output circuit, an optical-coupling isolation circuit and a CAN-bus/485-bus communication interface circuit. The utility is of a small volume, has complete functions, is low-cost; has a high system reliability and a good response performance.
Description
Technical field
The utility model relates to a kind of industrial measurement and control device, especially refer to a kind ofly have an electric energy measurement function based on the high-speed dsp technology, can gather electrical energy parameters such as active energy, reactive energy and the responsible far-end measurement and control unit device that on-site signal, commercial unit are monitored and controlled (being called for short RTU, Remote TerminalUnit).
Background technology
Far-end measurement and control unit device (being called for short RTU) is the common equipment in the Industry Control, and it is responsible for monitoring and control to on-site signal, commercial unit.Usually, it has analog quantity input port, switching value input port and switching value output port, is used to gather, controls the difficult node state that arrives of people at a distance.For example: parameters such as the node temperature that collection distant place people are difficult for measuring, humidity, DC voltage, DC current, after the data that collect are analyzed, the output control signal is controlled the action of on-the-spot various device, reaches the purpose that field apparatus is monitored and controlled.
But,, and, at present, need gather the AC energy signal at a lot of Industry Control scenes, and control along with the appearance of power supply shortage problem because the field condition complexity of actual needs control, controlled scene is of a great variety.Yet existing RTU does not have the function to ac signal acquisition, so, need be on existing RTU basis plug-in active electric energy meter, reactive energy-meter and data remote module, perhaps plug-in multifunctional electric energy meter on existing RTU basis calculates controlled node active energy and reactive energy, not only the cost height, complex structure, wiring is loaded down with trivial details, and is bulky, generally all needs to design big special-purpose panel box, and, there is the slow problem of response performance.
Summary of the invention
In order to satisfy the different on-the-spot needs of control, particularly need to gather, control the needs of the Industry Control occasion of electric energy, fundamental purpose of the present utility model provides a kind of far-end measurement and control unit device that has the electric energy acquisition function, this far-end measurement and control unit device is based on the high-speed dsp technology, in same measurement and control unit device, not only can gather switching value, analog quantity, be used to calculate active energy but also can gather, the alternating-current parameter of reactive energy, calculate active energy and reactive energy, field apparatus is controlled.
Another purpose of the present utility model provides a kind of far-end measurement and control unit device that has electric energy acquisition function and communication function, and this far-end measurement and control unit device has CAN bus communication mouth and 485 communication ports, can carry out data transmission by the communication interface that carries.
For achieving the above object, the utility model adopts following design proposal: a kind of far-end measurement and control unit device that has the electric energy acquisition function, it is made of housing, the analog quantity input terminal that is arranged on surface of shell, switching value input terminal, switching value lead-out terminal and the control circuit that is installed in the housing, it is characterized in that:
Also be provided with ac voltage input and alternating current input terminal on the surface of described housing;
Described control circuit is the control circuit based on the DSP microprocessor chip, and it is by ac signal acquisition circuit, analog signal processing circuit, analog quantity input and treatment circuit, A/D change-over circuit, switching value input circuit, switching value output circuit, optical coupling isolation circuit, constitute based on the microprocessor chip and the power circuit of DSP technology;
The signal input part of ac signal acquisition circuit links to each other with the alternating current input terminal with ac voltage input that is arranged on surface of shell, the signal output part of ac signal acquisition circuit links to each other with the input end of analog signal of analog signal processing circuit, and the analog signal output of analog signal processing circuit links to each other with one group of I/O mouth based on the microprocessor chip of DSP technology;
The input end of analog signal of analog quantity input and treatment circuit links to each other with the analog quantity input terminal that is arranged on surface of shell, its analog signal output links to each other with the input end of analog signal of A/D change-over circuit, and the digital signal output end of A/D change-over circuit links to each other with another group I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit;
The signal input part of switching value input circuit links to each other with the switching value input terminal that is arranged on surface of shell, and its signal output part links to each other with another group of I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit;
One group of I/O mouth again based on the microprocessor of DSP technology links to each other by the signal input end of optical coupling isolation circuit with the switching value output circuit, the control signal output ends of switching value output circuit links to each other with the switching value lead-out terminal that is arranged on surface of shell, export control signal, control the equipment at controlled scene.
Also be provided with CAN bus communication interface, 485 bus communication interfaces on the surface of described housing; Described control circuit also comprises CAN bus communication interface circuit and 485 bus communication interface circuits; The serial ports (MSCAN-TX, MSCAN-RX) of the microprocessor chip in the data input pin of CAN bus communication interface circuit (CAN TX, CAN RX) and the control circuit links to each other, and its data output end (CANH, CANL) links to each other with the CAN bus communication interface of surface of shell; Another serial ports (TXD0, RXD) of microprocessor chip in the data input pin of 485 communication interface circuit (TX, RX) and the control circuit links to each other, and its data output end (485A, 485B) links to each other with 485 communication interfaces of surface of shell.
Described ac signal acquisition circuit is made of 3 current transformers, 3 voltage transformer (VT) and operational amplifier; A, B, C three-phase alternating current signal that the signal input part of current transformer and the numerical value that controlled scene is difficult to measure are very high link to each other, and its signal output part links to each other by one group of I/O of the microprocessor chip in operational amplifier and the control circuit; A, B, C three-phase alternating voltage signal that the signal input part of voltage transformer (VT) and the numerical value that controlled scene is difficult to measure are very high link to each other, and its signal output part links to each other by one group of I/O of the microprocessor chip in operational amplifier and the control circuit.
Described A/D change-over circuit is successive approximation register type (SAR) A/D change-over circuit.
Described switching value output circuit is anti-error TRIP amount output circuit.
The utility model has the advantages that:
1, because the utility model can be gathered alternating voltage, the current signal that is used to calculate active energy and reactive energy, has the electric energy acquisition function, so, compare with existing RTU and to have saved plug-in active electric energy meter, reactive energy-meter or multifunctional electric energy meter, reduced the volume of far-end measurement and control unit device, make its structure simpler, reduced cost.
2, because the utility model adopts the DSP microprocessor with high-speed computation ability, and in a device, be integrated with analog quantity input/switching value input/switching value output and AC voltage signal acquisition circuit, reduce the integrated labile factor that causes of a plurality of parts, improved the reliability of device.
3, because the utility model carries CAN bus communication mouth and 485 communication ports, so, can realize the real-time Transmission of data, compare with existing RTU and improved response performance.
Description of drawings
Fig. 1 is the utility model control circuit theory diagram
Fig. 2 is the utility model specific embodiment control circuit theory diagram
Fig. 3 is the utility model ac signal acquisition circuit and analog signal processing circuit physical circuit figure
Fig. 4 is the input of the utility model analog quantity and treatment circuit, A/D change-over circuit and optical coupling isolation circuit physical circuit figure
Fig. 5 is the utility model switching value input circuit
Fig. 6 is the utility model switching value output circuit
Fig. 7 is the utility model microprocessor pin connection layout
Fig. 8 is the utility model power circuit
Fig. 9 is the utility model CAN bus communication interface circuit
Figure 10 is the utility model 485 communication interface circuit.
Embodiment
The far-end measurement and control unit device that has the electric energy acquisition function that the utility model provides is made of housing, ac voltage input that is arranged on surface of shell, alternating current input terminal, analog quantity input terminal, switching value input terminal, switching value lead-out terminal, CAN bus communication interface, 485 bus communication interfaces and the control circuit based on the DSP microprocessor chip that is installed in the housing.Core of the present utility model is mounted in the control circuit based on the DSP microprocessor chip in the housing, it not only can gather switching value, analog quantity, and, can also gather the ac voltage signal and the ac current signal that are used to calculate active energy and reactive energy, calculate active energy and reactive energy, signal according to the controlled scene of gathering, analyze, calculate, the output control signal, the control controlled device, and the data after will calculating are carried out data transmission by CAN bus communication interface and 485 bus communication interfaces.
As shown in Figure 1, the utility model be installed in the housing based on the control circuit of DSP microprocessor chip mainly by ac signal acquisition circuit, analog signal processing circuit, analog quantity input and treatment circuit, A/D change-over circuit, switching value input circuit, switching value output circuit, optical coupling isolation circuit, constitute based on the microprocessor chip and the power circuit of DSP technology.
The signal input part of ac signal acquisition circuit links to each other with the alternating current input terminal with ac voltage input that is arranged on surface of shell, the signal output part of ac signal acquisition circuit links to each other with the input end of analog signal of analog signal processing circuit, and the analog signal output of analog signal processing circuit links to each other with one group of I/O mouth based on the microprocessor chip of DSP technology.The ac signal acquisition circuit is mainly used in gathers alternating voltage and the ac current signal that controlled scene is used to calculate the high value of active energy and reactive energy; Analog signal processing circuit is mainly used in the AC signal that the ac voltage signal of AC voltage signal acquisition circuit output and ac current signal are become 0～5V and is transferred to microprocessor chip and handles.
The input end of analog signal of analog quantity input and treatment circuit links to each other with the analog quantity input terminal that is arranged on surface of shell, its analog signal output links to each other with the input end of analog signal of A/D change-over circuit, and the digital signal output end of A/D change-over circuit links to each other with another group I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit.Analog quantity input and treatment circuit are mainly used in the simulating signal (analog quantity) at the controlled scene of collection as temperature, humidity, DC voltage, DC current etc., then, by the A/D change-over circuit analog signal conversion of analog quantity input and treatment circuit collection is become digital signal, input to based on the microprocessor chip of DSP technology by optical coupling isolation circuit again and handle.
The signal input part of switching value input circuit links to each other with the switching value input terminal that is arranged on surface of shell, and its signal output part links to each other with another group of I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit.The switching value input circuit mainly is a state of gathering the controlled node in controlled scene, and the state of controlled node is transferred to microprocessor by optical coupling isolation circuit handles.
One group of I/O mouth again based on the microprocessor of DSP technology links to each other by the signal input end of optical coupling isolation circuit with the switching value output circuit, the control signal output ends of switching value output circuit links to each other with the switching value lead-out terminal that is arranged on surface of shell, the output control signal.The switching value lead-out terminal links to each other with the control end of controlled on-the-spot controlled device, controls the equipment at controlled scene.
Receive the signal such as alternating voltage, alternating current, DC voltage, DC current, temperature, humidity, controlled node state at controlled scene based on the microprocessor of DSP technology after, it is calculated, analyzes, the output control signal is controlled the action of controlled node by the switching value output circuit.
As shown in Figure 1, the control circuit based on the DSP microprocessor chip that the utility model is installed in the housing also comprises CAN bus communication interface circuit and 485 bus communication interface circuits, they link to each other with communication port 2 (serial ports 2) with communication port 1 (serial ports 1) based on the DSP microprocessor chip respectively, make the utility model have duplex industry network communication function simultaneously.Controlled on-the-spot active energy, reactive energy, various data after microprocessor calculates are carried out communication, data transmission by the computing machine of CAN bus communication mouth or 485 bus communication mouths and control center.
Fig. 2 is the utility model specific embodiment control circuit theory diagram.Because controlled on-the-spot alternating voltage and ac current signal data are very high, be difficult to measure, for safety, its numerical value of measurement/collection exactly, as shown in the figure, the utility model is measured the very high ac voltage signal of controlled on-the-spot numerical value by voltage transformer pt, measures the very high ac current signal of controlled on-the-spot numerical value by current transformer CT.
For the analog quantity with analog quantity input and treatment circuit collection output converts the digital signal that microprocessor can directly be handled to, the utility model adopts the A/D change-over circuit of SAR (successive approximation register type) structure, converts analog quantity to digital quantity.The major advantage of the A/D change-over circuit of SAR structure is that low-power consumption, high resolving power, high precision, output data do not exist delay.
In order to control controlled device exactly, the utility model adopts anti-error TRIP amount output circuit, output control signal, control controlled device.
Because the data volume that the utility model control circuit is gathered, handled is big, requirement has data processing speed faster, and more I/O mouth, so, the microprocessor of 16 bit that the utility model selects for use the motorola inc based on the DSP technology at a high speed to produce, and the advanced fft algorithm of combination is handled the ac voltage signal and the ac current signal that receive.
Fig. 3 is ac signal acquisition circuit and the analog signal processing circuit physical circuit figure on the utility model control circuit board.As shown in the figure, the ac signal acquisition circuit comprises current transformer T201～T203 and voltage transformer (VT) T204～T206 and operational amplifier LM224.It gathers very high A, B, the C three-phase alternating current signal of numerical value that controlled scene is difficult to measure by current transformer T201～T203, and by analog signal processing circuit LM224 it is transformed into pin ANA0～ANA2 that convenient 0～5V voltage signal of gathering is transferred to microprocessor shown in Figure 7 (model DSP56F807).It gathers very high A, B, the C three-phase alternating voltage signal of numerical value that controlled scene is difficult to measure by voltage transformer (VT) T204～T206, and by analog signal processing circuit LM224 pin ANA3～ANA5 that its 0～5V voltage signal that is transformed into convenient collection is transferred to microprocessor processes (model DSP56F807) is handled.
Fig. 4 is analog quantity input and treatment circuit, A/D change-over circuit and the optical coupling isolation circuit physical circuit figure on the utility model control circuit board.As shown in the figure, it gathers analog quantity by 8 road simulated measurement input circuits, behind 1: 1 amplifier, A/D converter (TLC2543) by the SAR structure converts digital quantity to, through optical coupling isolation circuit (TLP181) isolate pin SCLK, the MOSI be transferred to microprocessor shown in Figure 7 (model DSP56F807), MISO,
PHA0 carries out collection, the processing of analog data.
Fig. 5 is the switching value input circuit on the utility model control circuit board.It is made of the identical switching value input circuit of 12 line structures, every road is formed by resistance, diode and optocoupler, its input end DI1, DI2 ... DI12 links to each other with switching signal, its optocoupler output terminal DI ' 1, DI ' 2 ... DI ' 12 respectively with pin FAULTB3～FAULTB0, the ISB2～ISB0 of microprocessor shown in Figure 7 (model DSP56F807), collection and the processing that FAULTA0～FAULTA3 carries out switching value data.
Fig. 6 is the switching value output circuit on the utility model control circuit board.It is made of 6 way switch amount output circuits, every road constitutes by resistance, optocoupler P127 and relay, the switching value output pin PWMB0～PWMB5 of microprocessor shown in Figure 7 (model DSP56F807) links to each other by the negative electrode of resistance with optocoupler input end diode, the anode of diode links to each other with+3.3VD2 power supply, the control signal output ends of optocoupler links to each other with an end of relay coil, the other end of relay coil links to each other with ground, and the normally opened contact of relay links to each other with controlled device.In order to prevent the misoperation of switching value output circuit, this switching value output circuit has also increased anti-error jumping circuit, and this circuit is made up of triode V333 and resistance R 317, R319.The collector of triode V333 links to each other with+3.3VD1 power supply, and its base stage links to each other with the pin PWMA0 of microprocessor shown in Figure 7 (model DSP56F807) by resistance R 317, and its emitter links to each other with the working power+3.3VD2 of above-mentioned switching value output circuit.Have only when the pin PWMA0 of microprocessor output high level, triode V333 conducting, above-mentioned switching value output circuit just links to each other, powers on+3.3VD2 power supply.
Fig. 8 is the utility model power circuit.It mainly by+5V ,+12V voltage stabilizing chip (HAS10-5-W, HAS5-12-W) constitutes, generation+5V ,+direct supply of 12V provides working power for the The whole control circuit.
Fig. 9 is the utility model CAN bus communication interface circuit.It is a typical C AN bus communication interface circuit, its data input pin CAN TX, CAN RX link to each other with serial ports 1MSCAN-TX, the MSCAN-RX of microprocessor shown in Figure 7 (model DSP56F807), and its data output end CANH, CANL link to each other with the CAN bus communication interface of surface of shell.
Figure 10 is the utility model 485 communication interface circuit.It is typical 485 communication interface circuit, and its data input pin TX, RX link to each other with serial ports 2TXD0, the RXD0 of microprocessor shown in Figure 7 (model DSP56F807), and its data output end 485A, 485B link to each other with 485 communication interfaces of surface of shell.
The utility model has the advantages that:
1, can gather alternating voltage, the current signal that is used to calculate active energy and reactive energy, has the electric energy acquisition function, compare with existing RTU and to have saved plug-in active electric energy meter, reactive energy-meter or multifunctional electric energy meter, reduced the volume of far-end measurement and control unit device, make its structure simpler, reduced cost.
2, adopt DSP microprocessor with high-speed computation ability, and in a device, be integrated with analog quantity input/switching value input/switching value output and AC voltage signal acquisition circuit, reduce the integrated labile factor that causes of a plurality of parts, improved the reliability of device.
3, carry CAN bus communication mouth and 485 communication ports, can realize the real-time Transmission of data, compare with existing RTU and improved response performance.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection domain.
Claims (5)
1, a kind of far-end measurement and control unit device that has the electric energy acquisition function, it is made of housing, the analog quantity input terminal that is arranged on surface of shell, switching value input terminal, switching value lead-out terminal and the control circuit that is installed in the housing, it is characterized in that:
Also be provided with ac voltage input and alternating current input terminal on the surface of described housing;
Described control circuit is the control circuit based on the DSP microprocessor chip, and it is by ac signal acquisition circuit, analog signal processing circuit, analog quantity input and treatment circuit, A/D change-over circuit, switching value input circuit, switching value output circuit, optical coupling isolation circuit, constitute based on the microprocessor chip and the power circuit of DSP technology;
The signal input part of ac signal acquisition circuit links to each other with the alternating current input terminal with ac voltage input that is arranged on surface of shell, the signal output part of ac signal acquisition circuit links to each other with the input end of analog signal of analog signal processing circuit, and the analog signal output of analog signal processing circuit links to each other with one group of I/O mouth based on the microprocessor chip of DSP technology;
The input end of analog signal of analog quantity input and treatment circuit links to each other with the analog quantity input terminal that is arranged on surface of shell, its analog signal output links to each other with the input end of analog signal of A/D change-over circuit, and the digital signal output end of A/D change-over circuit links to each other with another group I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit;
The signal input part of switching value input circuit links to each other with the switching value input terminal that is arranged on surface of shell, and its signal output part links to each other with another group of I/O mouth based on the microprocessor of DSP technology by optical coupling isolation circuit;
One group of I/O mouth again based on the microprocessor of DSP technology links to each other by the signal input end of optical coupling isolation circuit with the switching value output circuit, the control signal output ends of switching value output circuit links to each other with the switching value lead-out terminal that is arranged on surface of shell, export control signal, control the equipment at controlled scene.
2, a kind of far-end measurement and control unit device that has the electric energy acquisition function according to claim 1 is characterized in that: also be provided with CAN bus communication interface, 485 bus communication interfaces on the surface of described housing;
Described control circuit also comprises CAN bus communication interface circuit and 485 bus communication interface circuits; The serial ports (MSCAN-TX, MSCAN-RX) of the microprocessor chip in the data input pin of CAN bus communication interface circuit (CAN RX, CAN RX) and the control circuit links to each other, and its data output end (CANH, CANL) links to each other with the CAN bus communication interface of surface of shell; Another serial ports (TXD0, RXD) of microprocessor chip in the data input pin of 485 communication interface circuit (TX, RX) and the control circuit links to each other, and its data output end (485A, 485B) links to each other with 485 communication interfaces of surface of shell.
3, a kind of far-end measurement and control unit device that has the electric energy acquisition function according to claim 1 and 2 is characterized in that: described ac signal acquisition circuit is made of 3 current transformers, 3 voltage transformer (VT) and operational amplifier;
A, B, C three-phase alternating current signal that the signal input part of current transformer and the numerical value that controlled scene is difficult to measure are very high link to each other, and its signal output part links to each other by one group of I/O of the microprocessor chip in operational amplifier and the control circuit;
A, B, C three-phase alternating voltage signal that the signal input part of voltage transformer (VT) and the numerical value that controlled scene is difficult to measure are very high link to each other, and its signal output part links to each other by one group of I/O of the microprocessor chip in operational amplifier and the control circuit.
4, a kind of far-end measurement and control unit device that has the electric energy acquisition function according to claim 3 is characterized in that: described A/D change-over circuit is successive approximation register type (SAR) A/D change-over circuit.
5, a kind of far-end measurement and control unit device that has the electric energy acquisition function according to claim 4, it is characterized in that: described switching value output circuit is anti-error TRIP amount output circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620119046 CN2935221Y (en) | 2006-07-26 | 2006-07-26 | Remote monitoring and controlling element apparatus with electrical energy collection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620119046 CN2935221Y (en) | 2006-07-26 | 2006-07-26 | Remote monitoring and controlling element apparatus with electrical energy collection function |
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| CN 200620119046 Expired - Fee Related CN2935221Y (en) | 2006-07-26 | 2006-07-26 | Remote monitoring and controlling element apparatus with electrical energy collection function |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001392A (en) * | 2010-11-05 | 2011-04-06 | 北京工业大学 | Vehicle-mounted information system for hybrid power handicapped motorcycle |
| CN102608944A (en) * | 2012-03-07 | 2012-07-25 | 北京瀚景锦河科技有限公司 | Expansion device and expansion system of semaphore collection port |
| CN103631184A (en) * | 2013-12-11 | 2014-03-12 | 济南诺辉节能技术开发有限公司 | Signal collecting circuit |
| CN106094646A (en) * | 2016-07-30 | 2016-11-09 | 国网河北省电力公司衡水供电分公司 | Power dispatching automation data collecting system |
| CN107479451A (en) * | 2017-09-26 | 2017-12-15 | 烟台海珐电气科技有限公司 | A kind of direct current composite measurement control unit |
| CN109188149A (en) * | 2018-09-29 | 2019-01-11 | 深圳星禾设计有限公司 | Electrical signal collection device |
| CN110470929A (en) * | 2019-07-30 | 2019-11-19 | 卡斯柯信号有限公司 | A kind of Portable railway signal monitoring diagnostic device |
| CN110932745A (en) * | 2019-11-25 | 2020-03-27 | 贵州航天凯山石油仪器有限公司 | Design method of combined RTU |
| CN111289915A (en) * | 2020-04-07 | 2020-06-16 | 广东电网有限责任公司 | a feedback power supply |
| CN111896801A (en) * | 2019-05-06 | 2020-11-06 | 崔岩 | Configurable electric energy, digital quantity and analog quantity integrated collector with multiple transmission modes |
| CN114649925A (en) * | 2020-12-21 | 2022-06-21 | 南京南瑞继保工程技术有限公司 | Alternating current-direct current high-power switching value general circuit with wide input range |
| CN115774416A (en) * | 2022-12-08 | 2023-03-10 | 北京特种机械研究所 | A DSP-based controller area network input and output device |
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2006
- 2006-07-26 CN CN 200620119046 patent/CN2935221Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001392A (en) * | 2010-11-05 | 2011-04-06 | 北京工业大学 | Vehicle-mounted information system for hybrid power handicapped motorcycle |
| CN102608944A (en) * | 2012-03-07 | 2012-07-25 | 北京瀚景锦河科技有限公司 | Expansion device and expansion system of semaphore collection port |
| CN103631184A (en) * | 2013-12-11 | 2014-03-12 | 济南诺辉节能技术开发有限公司 | Signal collecting circuit |
| CN103631184B (en) * | 2013-12-11 | 2016-03-02 | 山东诺辉节能技术开发有限公司 | Signal acquisition circuit |
| CN106094646A (en) * | 2016-07-30 | 2016-11-09 | 国网河北省电力公司衡水供电分公司 | Power dispatching automation data collecting system |
| CN107479451A (en) * | 2017-09-26 | 2017-12-15 | 烟台海珐电气科技有限公司 | A kind of direct current composite measurement control unit |
| CN109188149A (en) * | 2018-09-29 | 2019-01-11 | 深圳星禾设计有限公司 | Electrical signal collection device |
| CN109188149B (en) * | 2018-09-29 | 2024-05-07 | 深圳星禾设计有限公司 | Electric signal acquisition device |
| CN111896801A (en) * | 2019-05-06 | 2020-11-06 | 崔岩 | Configurable electric energy, digital quantity and analog quantity integrated collector with multiple transmission modes |
| CN110470929A (en) * | 2019-07-30 | 2019-11-19 | 卡斯柯信号有限公司 | A kind of Portable railway signal monitoring diagnostic device |
| CN110932745A (en) * | 2019-11-25 | 2020-03-27 | 贵州航天凯山石油仪器有限公司 | Design method of combined RTU |
| CN111289915A (en) * | 2020-04-07 | 2020-06-16 | 广东电网有限责任公司 | a feedback power supply |
| CN114649925A (en) * | 2020-12-21 | 2022-06-21 | 南京南瑞继保工程技术有限公司 | Alternating current-direct current high-power switching value general circuit with wide input range |
| CN115774416A (en) * | 2022-12-08 | 2023-03-10 | 北京特种机械研究所 | A DSP-based controller area network input and output device |
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