Analog-to-digital conversion device

Abstract

The invention relates to an analog-to-digital conversion device, which comprises a power conversion unit, an analog input unit, a communication unit, a control unit and a switching value output unit, the analog quantity input unit collects monitoring signals of a plurality of primary analog quantity instruments and sends analog quantity signals to the communication unit. The communication unit sends the analog quantity signal to the control unit and sends the switching value signal to the switching value output unit; the control unit performs conversion processing on the analog quantity signal to obtain a switching value signal and returns the switching value signal to the communication unit; and the switching value output unit outputs the switching value signal to post-stage equipment. According to the invention, on the premise of small change amount, low cost and low risk, on-site analog quantity remodeling work of the primary instrument can be realized. The inherent problems (fixed value drift, high failure rate, complex verification and the like) of the original mechanical primary analog quantity instrument can be solved, the digital upgrading of the platform can be realized, and the transformation and upgrading cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of switch signal monitoring, and more specifically, to an analog-to-digital conversion device. Background Art

[0002] During the initial construction period of the industrial production field, mechanical switches for monitoring parameters such as temperature, pressure, and flow were widely used. Control cables were used as transmission media and sent to DCS, PLC, and relay control circuits in the form of dry contacts to realize alarms, intermodal equipment switching / start and stop functions in the industrial control process. Such mechanical switches (that is, switch instruments) generally have the following problems: 1) The set value accuracy is not high, the set value and hysteresis adjustment process is complicated, the stability is poor, and the set value drift is serious; 2) It can only send out on-off signals, and cannot read the actual measured physical values ​​on site. When the action value is not reached, it is impossible to confirm whether the function is normal. It is necessary to perform regular calibration every year to improve availability, which significantly increases maintenance work; 3) The background control system only receives the 1 / 0 status information of the local switch quantity, and cannot obtain the real-time and historical parameters on site. When problems occur in the control process, it is impossible to obtain sufficient information to assist in fault location, troubleshooting, and resolution;

[0003] The original control platform (PLC or DCS platform) is built with relays. To solve the above problems, a new transfer control cabinet is needed. This solution requires abandoning the original switch input channel and replacing it with an analog input channel, and modifying the configuration to achieve the original control function. If too many analog inputs are added, there may be insufficient PLC or DCS input channels, and a large number of cards need to be added or even the control platform needs to be upgraded. This upgrade and transformation plan will inevitably lead to a significant increase in manpower and material costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an analog-to-digital conversion device in view of the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing an analog-to-digital conversion device, including: a power conversion unit, an analog input unit, a communication unit, a control unit and a switch output unit;

[0006] The power conversion unit is respectively connected to the analog input unit, the communication unit, the control unit and the switch output unit; the input end of the analog input unit is provided with a plurality of acquisition channels, and the plurality of acquisition channels are respectively connected to the corresponding primary analog instruments, the output end of the analog input unit is connected to the communication unit, and the communication unit is respectively connected to the control unit and the switch output unit;

[0007] The analog quantity input unit is used to collect monitoring signals output by multiple primary analog quantity meters, obtain analog quantity signals of the multiple primary analog quantity meters, and send the analog quantity signals to the communication unit;

[0008] The communication unit is used to send the analog signal to the control unit and send the switch signal returned by the control unit to the switch output unit;

[0009] The control unit is used to convert the analog signal to obtain the switch signal, and return the switch signal to the communication unit;

[0010] The switch quantity output unit is used to output the switch quantity signal to a subsequent device.

[0011] In the analog-to-digital conversion device of the present invention, the power conversion module includes: an input filter module, a bridge rectifier module, an energy storage filter module and a power control module;

[0012] The input end of the input filter module is connected to an external power supply, the output end of the input filter module is connected to the input end of the bridge rectifier module, the output end of the bridge rectifier module is connected to the input end of the energy storage filter module, the output end of the energy storage filter module is respectively connected to the analog input unit, the communication unit, the control unit and the switch output unit, and the power control module is respectively connected to the input filter module, the bridge rectifier module and the energy storage filter module;

[0013] The power control module is used to control and manage the input filter module, the bridge rectifier module and the energy storage filter module;

[0014] The input filter module is used to filter the power signal output by the external power supply and transmit it to the bridge rectifier module; the bridge rectifier module is used to rectify the signal output by the input filter module; the energy storage filter module stores energy and filters based on the rectified signal, and provides power supply signals to the analog input unit, the communication unit, the control unit and the switch output unit respectively.

[0015] In the analog-to-digital conversion device of the present invention, the analog quantity input unit comprises: a first power supply module, a first isolation module and a first controller;

[0016] The input end of the first power module is connected to the output end of the energy storage filter module, and the output end of the first power module is connected to the first isolation module and the first controller respectively;

[0017] The first power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a first power supply voltage, and provide the first power supply voltage to the first isolation module and the first controller respectively;

[0018] The first isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit;

[0019] The first controller is used to control and manage the first power module and the first isolation module.

[0020] In the analog-to-digital conversion device of the present invention, the communication unit includes: a power supply module, a communication module and a transformer isolation module;

[0021] The input end of the power supply module is connected to the output end of the energy storage filter module, and the output end of the power supply module is connected to the communication module and the transformer isolation module respectively;

[0022] The power supply module is used to convert the power supply signal and provide corresponding power supply voltages to the communication module and the transformer isolation module respectively;

[0023] The communication module is used to transmit the analog signal and / or the switch signal;

[0024] The transformer isolation module is used to transmit the analog signal to the control unit, and transmit the switch signal returned by the control unit to the communication module.

[0025] In the analog-to-digital conversion device of the present invention, the switch output unit includes: a fourth power supply module, a fourth isolation module and a fourth controller;

[0026] The input end of the fourth power supply module is connected to the output end of the energy storage filter module, and the output end of the fourth power supply module is connected to the fourth isolation module and the fourth controller respectively;

[0027] The fourth power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a fourth power supply voltage, and provide the fourth power supply voltage to the fourth isolation module and the fourth controller respectively;

[0028] The fourth isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit;

[0029] The fourth controller is used to control and manage the fourth power module and the fourth isolation module.

[0030] The analog-to-digital conversion device of the present invention further includes: a wireless network output unit, an analog output unit and a communication output unit;

[0031] The wireless network output unit is connected to the communication unit and is used to transmit the analog signal and / or switch signal transmitted by the communication unit to the terminal device in a wireless manner;

[0032] The analog output unit is connected to the communication unit and is used to output the analog signal transmitted by the communication unit to the subsequent device;

[0033] The communication output unit is connected to the communication unit, and is used to transmit the analog signal and / or the switch signal transmitted by the communication unit to the terminal device in a communication manner.

[0034] In the analog-to-digital conversion device of the present invention, the wireless network output unit includes: a second power supply module, a second isolation module and a second controller;

[0035] The input end of the second power supply module is connected to the output end of the energy storage filter module, and the output end of the second power supply module is connected to the second isolation module and the second controller respectively;

[0036] The second power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a second power supply voltage, and provide the second power supply voltage to the second isolation module and the second controller respectively;

[0037] The second isolation module is used to isolate and convert the analog signal and transmit the analog signal to the communication unit;

[0038] The second controller is used to control and manage the second power module and the second isolation module.

[0039] In the analog-to-digital conversion device of the present invention, the communication output unit includes: a third power supply module, a third isolation module and a third controller;

[0040] The input end of the third power supply module is connected to the output end of the energy storage filter module, and the output end of the third power supply module is connected to the third isolation module and the third controller respectively;

[0041] The third power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a third power supply voltage, and provide the third power supply voltage to the third isolation module and the third controller respectively;

[0042] The third isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit;

[0043] The third controller is used to control and manage the third power supply module and the third isolation module.

[0044] In the analog-to-digital conversion device of the present invention, the analog output unit includes: a fifth power supply module, a fifth isolation module and a fifth controller;

[0045] The input end of the fifth power module is connected to the output end of the energy storage filter module, and the output end of the fifth power module is connected to the fifth isolation module and the fifth controller respectively;

[0046] The fifth power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a fifth power supply voltage, and provide the fifth power supply voltage to the fifth isolation module and the fifth controller respectively;

[0047] The fifth isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit;

[0048] The fifth controller is used to control and manage the fifth power supply module and the fifth isolation module.

[0049] The analog-to-digital conversion device of the present invention further includes: a history storage unit, a display unit and a key input unit;

[0050] The history storage unit is connected to the control unit and is used to store the analog signal and the switch signal;

[0051] The display unit is connected to the communication unit and the control unit, and is used for outputting and displaying the analog signal and / or the switch signal and providing a fault reminder;

[0052] The key input unit is connected to the communication unit and the control unit, and is used for receiving an operation instruction and outputting an operation signal to the control unit according to the operation instruction.

[0053] The analog-to-digital conversion device implemented in the present invention has the following beneficial effects: including: a power conversion unit, an analog input unit, a communication unit, a control unit and a switch output unit; the analog input unit collects monitoring signals of multiple primary analog instruments and sends the analog signals to the communication unit; the communication unit sends the analog signals to the control unit and the switch signals to the switch output unit; the control unit converts and processes the analog signals to obtain the switch signals and returns the switch signals to the communication unit; the switch output unit outputs the switch signals to the subsequent equipment. The present invention can realize the analog conversion of on-site primary instruments under the premise of relatively small changes, low costs and risks. It can not only solve the inherent problems of the original mechanical primary analog instruments (set value drift, high failure rate, complex calibration, etc.), but also realize the digital upgrade of the platform, effectively reducing the cost of transformation and upgrading. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0055] Figure 1 It is a principle block diagram of the analog-to-digital conversion device provided by the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The present invention provides an analog-to-digital conversion device, which can achieve the analog upgrade of the original primary switch quantity instrument with minimal modification while keeping the original cables, channels and groups in their original state. Compared with the traditional upgrading and reconstruction scheme, the analog-to-digital conversion device of the present invention involves greatly reduced changes, and the equipment procurement and construction costs are significantly reduced. In addition, compared with the typical solution for the analog upgrade of the on-site primary switch quantity instrument, the present invention also has a later expansion function.

[0058] refer to Figure 1 , Figure 1 A principle block diagram of a preferred embodiment of the analog-to-digital conversion device provided by the present invention.

[0059] Specifically, Figure 1As shown, in this embodiment, the analog-to-digital conversion device includes: a power conversion unit 10, an analog input unit 20, a communication unit 30, a control unit 40 and a switch output unit 70. Among them, the power conversion unit 10 is connected to the analog input unit 20, the communication unit 30, the control unit 40 and the switch output unit 70 respectively; the input end of the analog input unit 20 is provided with a plurality of acquisition channels, and the plurality of acquisition channels are respectively connected to the corresponding primary analog instruments, the output end of the analog input unit 20 is connected to the communication unit 30, and the communication unit 30 is respectively connected to the control unit 40 and the switch output unit 70. In the embodiment of the present invention, the analog input unit 20 can realize the acquisition of signals of multiple primary analog instruments by setting a plurality of acquisition channels. Among them, the acquisition channel can be configured according to different application scenarios in actual applications, that is, different channel numbers / types, different sizes, etc. are configured according to different application scenarios. Further, the installation interface of the analog-to-digital conversion device of the present invention is rich (it can adopt a bracket type, a backplane bolt type, etc.), which is convenient for users to flexibly choose the installation method.

[0060] The analog input unit 20 is used to collect monitoring signals output by multiple primary analog instruments, obtain analog signals of multiple primary analog instruments, and send the analog signals to the communication unit 30; the communication unit 30 is used to send the analog signals to the control unit 40 and send the switch signals returned by the control unit 40 to the switch output unit 70; the control unit 40 is used to convert the analog signals, obtain the switch signals, and return the switch signals to the communication unit 30; the switch output unit 70 is used to output the switch signals to the subsequent equipment (such as the control platform (DCS platform, PLC platform)).

[0061] Optionally, in an embodiment of the present invention, the power conversion module includes: an input filter module 11, a bridge rectifier module 12, an energy storage filter module 13 and a power control module 14. Among them, the input end of the input filter module 11 is connected to the external power supply, the output end of the input filter module 11 is connected to the input end of the bridge rectifier module 12, the output end of the bridge rectifier module 12 is connected to the input end of the energy storage filter module 13, the output end of the energy storage filter module 13 is respectively connected to the analog input unit 20, the communication unit 30, the control unit 40 and the switch output unit 70, and the power control module 14 is respectively connected to the input filter module 11, the bridge rectifier module 12 and the energy storage filter module 13.

[0062] Specifically, in the embodiment of the present invention, the power control module 14 is used to control and manage the input filter module 11, the bridge rectifier module 12 and the energy storage filter module 13; the input filter module 11 is used to filter the power signal output by the external power supply and transmit it to the bridge rectifier module 12; the bridge rectifier module 12 is used to rectify the signal output by the input filter module 11; the energy storage filter module 13 stores energy and filters based on the rectified signal, and provides power supply signals to the analog input unit 20, the communication unit 30, the control unit 40 and the switch output unit 70 respectively.

[0063] Optionally, the power conversion module can receive 24-220V AC / DC power supply, which is convenient for nearby power supply, that is, the external power supply can be selected nearby, and the adaptability of the external power supply is wide. The power control module 14 controls and manages the input filter module 11, the bridge rectifier module 12 and the energy storage filter module 13, so that each module can realize its own function. Among them, the energy storage filter module 13 can output 24V direct current, wherein the 24V direct current can be used to power various units and modules in the analog-to-digital conversion device.

[0064] In the embodiment of the present invention, the analog input unit 20 includes: a first power supply module 21, a first isolation module 22 and a first controller 23. The input end of the first power supply module 21 is connected to the output end of the energy storage filter module 13, and the output end of the first power supply module 21 is respectively connected to the first isolation module 22 and the first controller 23; the first power supply module 21 is used to convert the power supply signal output by the energy storage filter module 13, obtain the first power supply voltage, and provide the first power supply voltage to the first isolation module 22 and the first controller 23 respectively; the first isolation module 22 is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit 30; the first controller 23 is used to control and manage the first power supply module 21 and the first isolation module 22.

[0065] Optionally, the first power supply voltage is specifically based on satisfying the first isolation module 22 and the first controller 23. Among them, the first controller 23 can be an MCU. Further, in an embodiment of the present invention, the first isolation module 22 can be implemented by a photoelectric coupler, or it can also be implemented by electronic components (such as transistors, MOS tubes), as long as the signal isolation transmission and level conversion can be achieved.

[0066] In the embodiment of the present invention, the communication unit 30 includes: a power supply module 31, a communication module 32 and a transformer isolation module 33. Among them, the input end of the power supply module 31 is connected to the output end of the energy storage filter module 13, and the output end of the power supply module 31 is connected to the communication module 32 and the transformer isolation module 33 respectively. The power supply module 31 is used to convert the power supply signal and provide the corresponding power supply voltage to the communication module 32 and the transformer isolation module 33 respectively; the communication module 32 is used to transmit analog signals and / or switch signals; the transformer isolation module 33 is used to transmit analog signals to the control unit 40, and transmit the switch signal returned by the control unit 40 to the communication module 32.

[0067] In the embodiment of the present invention, the switch output unit 70 includes: a fourth power supply module 71, a fourth isolation module 72 and a fourth controller 73. The input end of the fourth power supply module 71 is connected to the output end of the energy storage filter module 13, and the output end of the fourth power supply module 71 is connected to the fourth isolation module 72 and the fourth controller 73 respectively. The fourth power supply module 71 is used to convert the power supply signal output by the energy storage filter module 13, obtain the fourth power supply voltage, and provide the fourth power supply voltage to the fourth isolation module 72 and the fourth controller 73 respectively; the fourth isolation module 72 is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit 30; the fourth controller 73 is used to control and manage the fourth power supply module 71 and the fourth isolation module 72.

[0068] Optionally, the fourth power supply voltage is specifically based on satisfying the fourth isolation module 72 and the fourth controller 73. Among them, the fourth controller 73 can be an MCU. Further, in the embodiment of the present invention, the fourth isolation module 72 can be implemented by a photoelectric coupler, or it can also be implemented by electronic components (such as a triode, a MOS tube), as long as the signal isolation transmission and level conversion can be achieved.

[0069] Furthermore, if Figure 1 As shown, the analog-to-digital conversion device further includes: a wireless network output unit 50 , an analog output unit 80 and a communication output unit 60 .

[0070] The wireless network output unit 50 is connected to the communication unit 30, and is used to transmit the analog signal and / or switch signal transmitted by the communication unit 30 to the terminal device in a wireless manner; the analog output unit 80 is connected to the communication unit 30, and is used to output the analog signal transmitted by the communication unit 30 to the subsequent device; the communication output unit 60 is connected to the communication unit 30, and is used to transmit the analog signal and / or switch signal transmitted by the communication unit 30 to the terminal device in a communication manner.

[0071] In the embodiment of the present invention, the wireless network output unit 50 includes: a second power supply module 51, a second isolation module 52 and a second controller 53. The input end of the second power supply module 51 is connected to the output end of the energy storage filter module 13, and the output end of the second power supply module 51 is respectively connected to the second isolation module 52 and the second controller 53; the second power supply module 51 is used to convert the power supply signal output by the energy storage filter module 13, obtain the second power supply voltage, and provide the second power supply voltage to the second isolation module 52 and the second controller 53 respectively. The second isolation module 52 is used to isolate and convert the analog signal and transmit the analog signal to the communication unit 30; the second controller 53 is used to control and manage the second power supply module 51 and the second isolation module 52.

[0072] Optionally, the second supply voltage is specifically based on satisfying the second isolation module 52 and the second controller 53. Among them, the second controller 53 can be an MCU. Further, in the embodiment of the present invention, the second isolation module 52 can be implemented by a photoelectric coupler, or it can also be implemented by electronic components (such as transistors, MOS tubes), as long as the isolation transmission and level conversion of the signal can be achieved.

[0073] In the embodiment of the present invention, the communication output unit 60 includes: a third power supply module 61, a third isolation module 62 and a third controller 63. Among them, the input end of the third power supply module 61 is connected to the output end of the energy storage filter module 13, and the output end of the third power supply module 61 is connected to the third isolation module 62 and the third controller 63 respectively. The third power supply module 61 is used to convert the power supply signal output by the energy storage filter module 13, obtain the third power supply voltage, and provide the third power supply voltage to the third isolation module 62 and the third controller 63 respectively; the third isolation module 62 is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit 30; the third controller 63 is used to control and manage the third power supply module 61 and the third isolation module 62.

[0074] Optionally, the third power supply voltage is specifically based on satisfying the third isolation module 62 and the third controller 63. Among them, the third controller 63 can be an MCU. Further, in the embodiment of the present invention, the third isolation module 62 can be implemented by a photoelectric coupler, or it can also be implemented by electronic components (such as triodes, MOS tubes), as long as the signal isolation transmission and level conversion can be achieved.

[0075] In the embodiment of the present invention, the analog output unit 80 includes: a fifth power supply module 81, a fifth isolation module 82 and a fifth controller 83. The input end of the fifth power supply module 81 is connected to the output end of the energy storage filter module 13, and the output end of the fifth power supply module 81 is connected to the fifth isolation module 82 and the fifth controller 83 respectively. The fifth power supply module 81 is used to convert the power supply signal output by the energy storage filter module 13, obtain the fifth power supply voltage, and provide the fifth power supply voltage to the fifth isolation module 82 and the fifth controller 83 respectively; the fifth isolation module 82 is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit 30; the fifth controller 83 is used to control and manage the fifth power supply module 81 and the fifth isolation module 82.

[0076] Optionally, the fifth power supply voltage is specifically based on satisfying the fifth isolation module 82 and the fifth controller 83. Among them, the fifth controller 83 can be an MCU. Further, in the embodiment of the present invention, the fifth isolation module 82 can be implemented by a photoelectric coupler, or it can also be implemented by electronic components (such as a triode, a MOS tube), as long as the isolation transmission and level conversion of the signal can be achieved.

[0077] In the embodiment of the present invention, by setting up the wireless network output unit 50, it is possible to access the existing wireless network of each production plant, and realize the extended function of real-time data reading of terminal devices such as office computers and mobile phones. By setting up the communication output unit 60, it is possible to realize the extended function of outputting the collected analog signal and the converted switch signal to the collection platform by communication according to later needs. By setting up the analog output unit 80, it is possible to realize the extended function of sending out analog signals (the signal form is optional) according to later needs.

[0078] Furthermore, if Figure 1 As shown, the analog-to-digital conversion device further includes: a history storage unit 90 , a display unit 100 and a key input unit 101 .

[0079] The history storage unit 90 is connected to the control unit 40 and is used to store analog signals and switch signals. By setting the history storage unit 90, storage and reading of related signals / data, historical data query, historical trend query, etc. can be realized.

[0080] The display unit 100 is connected to the communication unit 30 and the control unit 40, and is used for outputting and displaying analog signals and / or switch signals and for fault reminder. By setting the display unit 100, it is possible to output and display the faults of each analog signal, switch signal, primary analog instrument and the internal module of the analog-to-digital conversion device. Among them, the control unit 40 can periodically detect the current, voltage and other parameters of the analog input circuit to judge the quality bit of the primary analog signal, and send the quality bit fault information to the display unit 100, and output the fault information through the display unit 100 to achieve the purpose of fault reminder.

[0081] The key input unit 101 is connected to the communication unit 30 and the control unit 40, and is used to receive operation instructions and output operation signals to the control unit 40 according to the operation instructions. By setting the key input unit 101, the configuration of each input and output port, as well as the range, fixed value, temperature compensation and other parameter settings of each signal can be realized, without the need for an external computer to perform complex programming operations, which can greatly reduce the difficulty and risk of the operation.

[0082] The present invention configures different acquisition channels through the analog input unit 20 to adapt to primary analog instruments, and correspondingly receives various primary analog signals such as active / passive 4-20mA transmitter signals, TC thermocouple signals (the device can perform temperature compensation), RTD thermal resistor signals (two-wire, three-wire, four-wire, etc.), which are received by the communication unit 30 and converted and processed by the control unit 40 to obtain corresponding switch signals, and then the analog switch signals and switch signals are transmitted to each unit (switch output unit 70, analog output unit 80, communication output unit 60, wireless network output unit 50) through the communication unit 30 for output conversion, thereby realizing the integrated conversion and output of multiple types of primary analog instruments nearby to the control platform.

[0083] The present invention can realize hard-wired direct transmission of analog signals and switch signals by setting up an analog output unit 80 and a switch output unit 70, can realize communication mode (such as MODBUS) transmission through the communication output unit 60, and use the wireless network output unit 50 to transmit information to background computers, mobile phones and other terminal devices for display, alarm, etc., so as to facilitate real-time monitoring and rapid response to relevant signals.

[0084] The present invention adds an analog-to-digital conversion device on site, collects the primary analog instruments (such as transmitters, thermocouples, thermal resistors, etc.) in the nearby area through the newly laid short cables, collects them through the analog input unit 20, and then transmits the signals through the communication unit 30 and the control unit 40, converts the primary analog signals into switch signals, and sends the switch signals through the port of the switch output unit 70, thereby realizing the signal collection and transmission function. At the same time, the power conversion unit 10 is set inside to convert the external power into the power form required by each unit inside the device, and the external power can be selected nearby.

[0085] By using the analog-to-digital conversion device of the present invention, the analog conversion of on-site primary instruments can be achieved with relatively small changes, low costs and risks. It can not only solve the inherent problems of the original mechanical primary switch quantity instrument (set value drift, high failure rate, complex calibration, etc.), but also realize the "digital" upgrade of the platform. Combined with multiple functions that are convenient for later expansion needs, the hidden benefits of this device for the production site are obvious. This analog-to-digital conversion device can be widely used in the situation where the primary switch quantity instruments at the production site in various fields are upgraded to analog quantity instruments. At the same time, the design ideas of this device can also provide reference for the upgrade plans of other similar projects.

[0086] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0087] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0088] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0089] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An analog-to-digital conversion device, characterized in that: include: Power conversion unit, analog input unit, communication unit, control unit and switch output unit; The power conversion unit is respectively connected to the analog input unit, the communication unit, the control unit and the switch output unit; the input end of the analog input unit is provided with a plurality of acquisition channels, and the plurality of acquisition channels are respectively connected to the corresponding primary analog instruments, the output end of the analog input unit is connected to the communication unit, and the communication unit is respectively connected to the control unit and the switch output unit; The analog quantity input unit is used to collect monitoring signals output by multiple primary analog quantity meters, obtain analog quantity signals of the multiple primary analog quantity meters, and send the analog quantity signals to the communication unit; The communication unit is used to send the analog signal to the control unit and send the switch signal returned by the control unit to the switch output unit; The control unit is used to convert the analog signal to obtain the switch signal, and return the switch signal to the communication unit; The switch quantity output unit is used to output the switch quantity signal to a subsequent device.

2. The analog-to-digital conversion device according to claim 1, characterized in that: The power conversion module includes: an input filter module, a bridge rectifier module, an energy storage filter module and a power control module; The input end of the input filter module is connected to an external power supply, the output end of the input filter module is connected to the input end of the bridge rectifier module, the output end of the bridge rectifier module is connected to the input end of the energy storage filter module, the output end of the energy storage filter module is respectively connected to the analog input unit, the communication unit, the control unit and the switch output unit, and the power control module is respectively connected to the input filter module, the bridge rectifier module and the energy storage filter module; The power control module is used to control and manage the input filter module, the bridge rectifier module and the energy storage filter module; The input filter module is used to filter the power signal output by the external power supply and transmit it to the bridge rectifier module; the bridge rectifier module is used to rectify the signal output by the input filter module; the energy storage filter module stores energy and filters based on the rectified signal, and provides power supply signals to the analog input unit, the communication unit, the control unit and the switch output unit respectively.

3. The analog-to-digital conversion device according to claim 2, characterized in that: The analog input unit includes: a first power supply module, a first isolation module and a first controller; The input end of the first power module is connected to the output end of the energy storage filter module, and the output end of the first power module is connected to the first isolation module and the first controller respectively; The first power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a first power supply voltage, and provide the first power supply voltage to the first isolation module and the first controller respectively; The first isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit; The first controller is used to control and manage the first power module and the first isolation module.

4. The analog-to-digital conversion device according to claim 2, characterized in that: The communication unit includes: a power supply module, a communication module and a transformer isolation module; The input end of the power supply module is connected to the output end of the energy storage filter module, and the output end of the power supply module is connected to the communication module and the transformer isolation module respectively; The power supply module is used to convert the power supply signal and provide corresponding power supply voltages to the communication module and the transformer isolation module respectively; The communication module is used to transmit the analog signal and / or the switch signal; The transformer isolation module is used to transmit the analog signal to the control unit, and transmit the switch signal returned by the control unit to the communication module.

5. The analog-to-digital conversion device according to claim 2, characterized in that: The switch output unit includes: a fourth power supply module, a fourth isolation module and a fourth controller; The input end of the fourth power supply module is connected to the output end of the energy storage filter module, and the output end of the fourth power supply module is connected to the fourth isolation module and the fourth controller respectively; The fourth power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a fourth power supply voltage, and provide the fourth power supply voltage to the fourth isolation module and the fourth controller respectively; The fourth isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit; The fourth controller is used to control and manage the fourth power module and the fourth isolation module.

6. The analog-to-digital conversion device according to claim 2, characterized in that: Also includes: Wireless network output unit, analog output unit and communication output unit; The wireless network output unit is connected to the communication unit and is used to transmit the analog signal and / or switch signal transmitted by the communication unit to the terminal device in a wireless manner; The analog output unit is connected to the communication unit and is used to output the analog signal transmitted by the communication unit to the subsequent device; The communication output unit is connected to the communication unit, and is used to transmit the analog signal and / or the switch signal transmitted by the communication unit to the terminal device in a communication manner.

7. The analog-to-digital conversion device according to claim 6, characterized in that: The wireless network output unit includes: a second power supply module, a second isolation module and a second controller; The input end of the second power supply module is connected to the output end of the energy storage filter module, and the output end of the second power supply module is connected to the second isolation module and the second controller respectively; The second power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a second power supply voltage, and provide the second power supply voltage to the second isolation module and the second controller respectively; The second isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit; The second controller is used to control and manage the second power module and the second isolation module.

8. The analog-to-digital conversion device according to claim 6, characterized in that: The communication output unit includes: a third power supply module, a third isolation module and a third controller; The input end of the third power supply module is connected to the output end of the energy storage filter module, and the output end of the third power supply module is connected to the third isolation module and the third controller respectively; The third power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a third power supply voltage, and provide the third power supply voltage to the third isolation module and the third controller respectively; The third isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit; The third controller is used to control and manage the third power supply module and the third isolation module.

9. The analog-to-digital conversion device according to claim 6, characterized in that: The analog output unit includes: a fifth power supply module, a fifth isolation module and a fifth controller; The input end of the fifth power module is connected to the output end of the energy storage filter module, and the output end of the fifth power module is connected to the fifth isolation module and the fifth controller respectively; The fifth power supply module is used to convert the power supply signal output by the energy storage filter module to obtain a fifth power supply voltage, and provide the fifth power supply voltage to the fifth isolation module and the fifth controller respectively; The fifth isolation module is used to isolate and convert the analog signal, and transmit the analog signal to the communication unit; The fifth controller is used to control and manage the fifth power supply module and the fifth isolation module.

10. The analog-to-digital conversion device according to any one of claims 1 to 9, characterized in that: Also includes: History storage unit, display unit and key input unit; The history storage unit is connected to the control unit and is used to store the analog signal and the switch signal; The display unit is connected to the communication unit and the control unit, and is used for outputting and displaying the analog signal and / or the switch signal and providing a fault reminder; The key input unit is connected to the communication unit and the control unit, and is used for receiving an operation instruction and outputting an operation signal to the control unit according to the operation instruction.

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