CN204331374U - A kind of multichannel analog amount output module - Google Patents
A kind of multichannel analog amount output module Download PDFInfo
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- CN204331374U CN204331374U CN201420858908.1U CN201420858908U CN204331374U CN 204331374 U CN204331374 U CN 204331374U CN 201420858908 U CN201420858908 U CN 201420858908U CN 204331374 U CN204331374 U CN 204331374U
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Abstract
The utility model provides a kind of multichannel analog amount output module, comprise single-chip microcomputer, programmable logic array and multiple digital-to-analogue conversion module, single-chip microcomputer is used for data communication, programmable logic array is used for parallel data processing and exports on multiple channels, the digital signal that programmable logic array exports is converted to simulating signal by digital-to-analogue conversion module, single-chip microcomputer is connected with programmable logic array, programmable logic array and each digital-to-analogue conversion model calling.The multichannel analog amount output module that the utility model provides, in conjunction with single-chip microcomputer and programmable logic array, makes multiple channel parallel export, improves the response speed of output; Adopt high-precision digital simulation amount conversion chip to realize high precision to regulate; Adopt electric current driving chip and feedback circuit to form close loop control circuit, further high precision regulating and control is carried out to analog quantity.
Description
Technical field
The utility model relates to a kind of multichannel analog amount output module, particularly relates to a kind of multichannel analog amount parallel output system based on FPGA.
Background technology
At present, DCS system is widely used in industrial circle, it is one, and what be made up of process control level and process monitoring level take communication network as the multi-level computer system of tie, and its basic thought is that decentralised control, centralized operation, differentiated control, flexible configuration, configuration are convenient.Principal feature is high reliability, opening, controlling functions enrich.Analog output (AO) is a critical function of DCS system.
In prior art, analog output has and uses potentiometer to carry out regulating, but this analog output cannot realize accurate control, and regulates trouble, as shown in Figure 1.
In prior art, analog output adopts one piece of single-chip microcomputer to control the pattern of multiple passage output simultaneously.Due to the mode of operation that single-chip microcomputer is all single-threaded, therefore when taking into account communication and detecting external status, the work efficiency of single-chip microcomputer is relatively low, and analog output response is comparatively slow, as shown in Figure 2.
Those skilled in the art are devoted to provide the multichannel analog amount output module that a kind of work efficiency is high, high precision regulates.
Summary of the invention
For problems of the prior art, the object of utility model is to provide a kind of multichannel analog amount output module, in conjunction with single-chip microcomputer and programmable logic array, communication work has been come by single-chip microcomputer, analog output has been come by programmable logic array, multiple channel parallel is exported, improves the response speed of output; High-precision digital simulation amount conversion chip realizes high precision and regulates.
The utility model provides a kind of multichannel analog amount output module, comprise single-chip microcomputer, programmable logic array and multiple digital-to-analogue conversion module, single-chip microcomputer is used for data communication, programmable logic array has multiple general programmable input and output pin, these pins are individually connected on the signal wire of each passage, when exporting control signal and being enable, parallel data processing is also exported on multiple channels, the digital signal that programmable logic array exports is converted to simulating signal by digital-to-analogue conversion module, single-chip microcomputer is connected with programmable logic array, programmable logic array and each digital-to-analogue conversion model calling.
The multichannel analog amount output module that the utility model provides, in conjunction with single-chip microcomputer and programmable logic array, adopt task classification mechanism, communication work has been come by single-chip microcomputer, and analog output has been come by programmable logic array.
Further, digital-to-analogue conversion module is 12 bit digital analog-converted chips, adopts high-precision digital-to-analogue conversion chip, can carry out high precision regulating and control to analog quantity.
Further, between programmable logic array and each digital-to-analogue conversion module, photoelectrical coupler is set, Phototube Coupling can be carried out to analog output, ensure multichannel analog amount output module reliably working.
Further, multichannel analog amount output module also comprises multiple electric current driving chip, and each electric current driving chip is connected with a digital simulation modular converter, the Control of Voltage electric current driving chip that digital-to-analogue conversion module exports.
Further, electric current driving chip is connected with feedback circuit, to form close loop control circuit.
The multichannel analog amount output module that the utility model provides, electric current driving chip and feedback circuit is adopted to form close loop control circuit, adopt closed-loop control, finally make analog output meet control accuracy requirement, further high precision regulating and control is carried out to analog quantity.
Further, multichannel analog amount output module comprises overload testing circuit, and whether be in overload state for detecting load circuit, overload testing circuit is connected with electric current driving chip.
Whether further, electric current driving chip comprises open detection circuit, open a way for detecting load circuit.
Compared with prior art, the multichannel analog amount output module that the utility model provides has following beneficial effect:
(1) in conjunction with single-chip microcomputer and programmable logic array, communication work has been come by single-chip microcomputer, and analog output has been come by programmable logic array, multiple channel parallel is exported, improves the response speed of output; High-precision digital simulation amount conversion chip realizes high precision and regulates;
(2) adopt high-precision digital-to-analogue conversion chip, high precision regulating and control can be carried out to analog quantity;
(3) adopt electric current driving chip and feedback circuit to form close loop control circuit, further high precision regulating and control is carried out to analog quantity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram adopting potentiometer to realize analog output control in prior art;
Fig. 2 is the schematic diagram adopting chip microcontroller analog output to control in prior art;
Fig. 3 is the schematic diagram of the multichannel analog amount output module of an embodiment of the present utility model;
Fig. 4 is the schematic diagram of the multichannel analog amount output module shown in Fig. 3;
Fig. 5 is the close loop control circuit schematic diagram of the multichannel analog amount output module shown in Fig. 3;
Fig. 6 is overload protection and the open detection circuit schematic diagram of the multichannel analog amount output module shown in Fig. 3.
Embodiment
Be described in more detail below in conjunction with the embodiment of accompanying drawing to utility model.
As shown in Figure 3, the multichannel analog amount output module of an embodiment of the present utility model, comprise single-chip microcomputer, programmable logic array and multiple digital-to-analogue conversion module, single-chip microcomputer is used for data communication, programmable logic array is used for parallel data processing and exports on multiple channels, the digital signal that programmable logic array exports is converted to simulating signal by digital-to-analogue conversion module, single-chip microcomputer is connected with programmable logic array, programmable logic array and each digital-to-analogue conversion model calling.
The multichannel analog amount output module of the present embodiment, in conjunction with single-chip microcomputer and programmable logic array, adopt task classification mechanism, communication work has been come by single-chip microcomputer, and analog output has been come by programmable logic array.
Digital-to-analogue conversion module is 12 bit digital analog-converted chips, adopts high-precision digital-to-analogue conversion chip, can carry out high precision regulating and control to analog quantity.
Between programmable logic array and each digital-to-analogue conversion module, photoelectrical coupler is set, Phototube Coupling can be carried out to analog output, ensure multichannel analog amount output module reliably working.
Multichannel analog amount output module also comprises multiple electric current driving chip, and each electric current driving chip is connected with a digital simulation modular converter, the Control of Voltage electric current driving chip that digital-to-analogue conversion module exports.
Electric current driving chip is connected with feedback circuit.
Feedback circuit comprises feedback resistance R, the given voltage U of instruction and feedback resistance R voltage U b are compared by comparer, form close loop control circuit, as shown in Figure 5, according to the duty of comparative result determination electric current driving chip, output is finally made to meet control accuracy requirement.
The multichannel analog amount output module of the present embodiment, adopts electric current driving chip and feedback circuit to form close loop control circuit, carries out high precision regulating and control further to analog quantity.
In the present embodiment, single-chip microcomputer adopts the N79E825 of Nuvoton company as main control chip, and adopt C language programming, complete the communication with programmable logic array, communication physical arrangement adopts local bus.Hardware adopts high speed magnetic medium isolating chip, and isolation field apparatus, to the interference of system, normally works to protect internal control circuit.
In the present embodiment, programmable logic array (FPGA) adopts the LCMXO2-1200 chip of Lattice company, uses Verilog programming language.In FPGA inside, to have built an amount of capacity be the DPRAM of 2K, readablely writes, by it and microcontroller communication.Its inside achieves 8 road analog quantity control modules, utilizes the output of its abundant pin resource parallel control 8 tunnel analog quantity.
In the present embodiment, 8 analog output channels, tunnel are mutually isolated, affect between the road reducing communication link to greatest extent.
Digital-to-analogue conversion module adopts 12 D/A conversion chip DAC7311 of TI company, and FPGA directly exports to D/A conversion chip output voltage signal instruction, and this voltage signal controls electric current driving chip XTR111, makes it export the analog value of expectation.Electric current driving chip XTR111 forms close loop control circuit together with the feedback circuit of rear class, finally makes output meet control accuracy requirement.
To detect the voltage U+compare with reference voltage Ur at resistance Ri two ends, as shown in Figure 6, if voltage U is greater than reference voltage Ur, load circuit is in overload state; If voltage U is less than or equal to reference voltage Ur, load circuit is in normal condition.
Electric current driving chip XTR111 is integrated with open detection circuit, is connected with electric current driving chip XTR111 by two ends U+, U-of the voltage detecting resistance Ri two ends, and the open circuit realizing load circuit detects, as shown in Figure 6.
If detect that load circuit is opened a way, carry out break alarm by the mode lighting LED light.
The multichannel analog amount output module that the utility model provides, in conjunction with single-chip microcomputer and programmable logic array, communication work has been come by single-chip microcomputer, and analog output has been come by programmable logic array, multiple channel parallel is exported, improves the response speed of output; Adopt high-precision digital simulation amount conversion chip to realize high precision to regulate; Adopt high-precision digital-to-analogue conversion chip, high precision regulating and control can be carried out to analog quantity; Adopt electric current driving chip and feedback circuit to form close loop control circuit, further high precision regulating and control is carried out to analog quantity.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that the ordinary skill of this area just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, all technician in the art according to design of the present utility model on the basis of existing technology by logic analysis, reasoning or limited to the technical scheme obtained, all should by the determined protection domain of claims.
Claims (7)
1. a multichannel analog amount output module, it is characterized in that, described multichannel analog amount output module comprises single-chip microcomputer, programmable logic array and multiple digital-to-analogue conversion module, described single-chip microcomputer is used for data communication, described programmable logic array is used for described parallel data processing and exports on multiple channels, the digital signal that described programmable logic array exports is converted to simulating signal by described digital-to-analogue conversion module, described single-chip microcomputer is connected with described programmable logic array, described programmable logic array and each digital-to-analogue conversion model calling.
2. multichannel analog amount output module as claimed in claim 1, it is characterized in that, described digital-to-analogue conversion module is 12 bit digital analog-converted chips.
3. multichannel analog amount output module as claimed in claim 1, is characterized in that, arrange photoelectrical coupler between described programmable logic array and each described digital-to-analogue conversion module.
4. multichannel analog amount output module as claimed in claim 1, it is characterized in that, described multichannel analog amount output module also comprises multiple electric current driving chip, each described electric current driving chip is connected with a digital simulation modular converter, electric current driving chip described in the Control of Voltage that described digital-to-analogue conversion module exports.
5. multichannel analog amount output module as claimed in claim 4, it is characterized in that, described electric current driving chip is connected with feedback circuit, to form close loop control circuit.
6. multichannel analog amount output module as claimed in claim 4, it is characterized in that, described multichannel analog amount output module comprises overload testing circuit, and whether be in overload state for detecting load circuit, described overload testing circuit is connected with described electric current driving chip.
7. multichannel analog amount output module as claimed in claim 4, whether it is characterized in that, described electric current driving chip comprises open detection circuit, open a way for detecting load circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420858908.1U CN204331374U (en) | 2014-12-29 | 2014-12-29 | A kind of multichannel analog amount output module |
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| CN201420858908.1U CN204331374U (en) | 2014-12-29 | 2014-12-29 | A kind of multichannel analog amount output module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104908681A (en) * | 2015-06-19 | 2015-09-16 | 陕西法士特齿轮有限责任公司 | Vehicle speed signal conditioning transition system and control method thereof |
| CN108829006A (en) * | 2018-06-29 | 2018-11-16 | 北京广利核系统工程有限公司 | The analogue quantity output device and method of alternative output voltage or electric current |
| CN112543531A (en) * | 2020-12-10 | 2021-03-23 | 东南大学 | Multi-channel multi-bit driving chip for scattering array surface |
| CN114815720A (en) * | 2022-06-29 | 2022-07-29 | 天津飞旋科技股份有限公司 | Programmable controller, analog quantity multiplexing interface control method thereof and storage medium |
-
2014
- 2014-12-29 CN CN201420858908.1U patent/CN204331374U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104908681A (en) * | 2015-06-19 | 2015-09-16 | 陕西法士特齿轮有限责任公司 | Vehicle speed signal conditioning transition system and control method thereof |
| CN108829006A (en) * | 2018-06-29 | 2018-11-16 | 北京广利核系统工程有限公司 | The analogue quantity output device and method of alternative output voltage or electric current |
| CN112543531A (en) * | 2020-12-10 | 2021-03-23 | 东南大学 | Multi-channel multi-bit driving chip for scattering array surface |
| CN114815720A (en) * | 2022-06-29 | 2022-07-29 | 天津飞旋科技股份有限公司 | Programmable controller, analog quantity multiplexing interface control method thereof and storage medium |
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