CN204086903U - A kind of control system for portable the escaping of ammonia analyser - Google Patents
A kind of control system for portable the escaping of ammonia analyser Download PDFInfo
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- CN204086903U CN204086903U CN201420582531.1U CN201420582531U CN204086903U CN 204086903 U CN204086903 U CN 204086903U CN 201420582531 U CN201420582531 U CN 201420582531U CN 204086903 U CN204086903 U CN 204086903U
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Abstract
The utility model provides a kind of control system for portable the escaping of ammonia analyser, comprises main control unit, peripheral circuit, power circuit and external interface, and wherein power circuit is that main control unit and peripheral circuit are powered; Main control unit is connected with external interface through peripheral circuit; Wherein peripheral circuit comprises digital input circuit, digital quantity output circuit, temperature collection circuit and CAN communication circuit.This control system is by collecting temperature and control heating unit, under making equipment may operate in temperature that is constant, that can arrange.By gathering digital quantity input and the output of control figure amount, the function controlling to open, stop sampling pump by button click can be realized, also can realize the function of equipment automatic zero adjustment and calibration.The control system that the utility model provides and method for designing reliable and stable, for the escaping of ammonia monitoring there is higher sensitivity and anti-interference, can be used for the monitoring of the industry production such as thermal power generation, iron and steel, petrochemical industry for the escaping of ammonia.
Description
Technical field
The utility model belongs to electronic control system technical field, particularly relates to a kind of control system for portable the escaping of ammonia analyser.
Background technology
The NH that industry produces in industrial processes is polluted in the highly energy-consumings such as thermal power generation, iron and steel, petrochemical industry
3deng pollutant emission in air, the control reduced discharging along with national pollution source, the smoke emissioning concentration of above-mentioned industrial pollution source reduces year by year, and control system needs integrated function to get more and more, and this proposes requirements at the higher level to flue gas monitoring.
The control system function singleness that current the escaping of ammonia monitoring adopts, the accuracy of measurement result also cannot meet day by day harsh performance index requirement, and board design is complicated, lacks versatility.For problem existing in above-mentioned prior art, a kind of novel control system of research and design, thus the problem existing for overcoming in prior art is very necessary.
Summary of the invention
The utility model provides a kind of control system, thus solves the escaping of ammonia monitor control system function singleness in the past, and error is comparatively large, and board design is complicated, lacks the problems such as versatility.
the technical solution of the utility model is as follows:
For a control system for portable the escaping of ammonia analyser, comprise main control unit, peripheral circuit, power circuit and external interface, wherein power circuit is that main control unit and peripheral circuit are powered; Main control unit is connected with external interface through peripheral circuit; Wherein peripheral circuit comprises digital input circuit, digital quantity output circuit, temperature collection circuit and CAN communication circuit.External interface is connected with components and parts such as portable the escaping of ammonia analyser relay, sampling pump, heating units.
This control system is by collecting temperature and control heating unit, under making equipment may operate in temperature that is constant, that can arrange.By gathering digital quantity input and the output of control figure amount, the function controlling to open, stop sampling pump by button click can be realized, also can realize the function of equipment automatic zero adjustment and calibration.
Described main control unit comprises microcontroller, the clock circuit be connected with microcontroller, reset circuit, ISP circuit, eeprom circuit and JTAG debugging interface.
Described main control unit also comprises the filtering circuit be connected with described power circuit.
The LM1117-3.3 that described power circuit comprises WRB2405CS-2W chip, WRA2412CS-2W chip, K7805-1000 chip are connected with described WRB2405CS-2W chip.
Described digital input circuit, digital quantity output circuit, temperature collection circuit are connected respectively by digital buffer circuit with microcontroller.
Described temperature collection circuit comprises: two path analoging switch ADG509, four road PT100 temperature sensor and ADD711 modular converters, the control end of four road PT100 temperature sensors is connected with main control unit through analog switch ADG509, and the signal output part of four road PT100 temperature sensors is connected with main control unit through ADD711 modular converter.
Described digital quantity output circuit also comprises one group of signal designation circuit for lamp.
the utility model tool has the following advantages:
Control System Design of the present utility model is novel, and complete function, is suitable for the monitoring of the escaping of ammonia analyser.
Hardware design of the present utility model has versatility, portability and reusability.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, be briefly described to the accompanying drawing used required in this practical description below.
The structured flowchart of the control system that Fig. 1 provides for the utility model;
The digital input circuit schematic diagram that Fig. 2 provides for the utility model;
The digital quantity output circuit schematic diagram that Fig. 3 provides for the utility model;
The temperature collection circuit schematic diagram that Fig. 4 provides for the utility model;
Embodiment
Below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and this is practical to be not used in restriction.
The structural drawing of the control system that Fig. 1 provides for the utility model and method for designing thereof, comprises main control unit 100, peripheral circuit 200, power circuit 300 and external interface 400.
Main control unit comprises clock circuit 101, reset circuit 102, ISP circuit 103, eeprom circuit 104 and the JTAG debugging interface 105 that described microcontroller connects.
Peripheral circuit comprises digital input circuit 201, digital quantity output circuit 202, temperature collection circuit 203, CAN communication circuit 204.
Described temperature collection circuit comprises four PT100 temperature sensors, two analog switches, AD conversion chip and isolating chips, by analog switch gating four road PT100 temperature sensor, the mode of poll is adopted to carry out collecting temperature input, and by impact that this circuit for eliminating turning circuit brings;
Described digital input circuit comprises external interface, driving chip ULN2003, shift register 74HC165 and isolating chip ADuM1301.Seven railway digital amount signals (24V d. c. voltage signal) are connected with driving chip by external interface, by shift register, seven road voltage signals are converted to a circuit-switched data signal, then are transferred to acp chip LPC1768 after being isolated by isolating chip.。Such as first via digital quantity is input as 24VDC, and all the other six tunnels are input as 0VDC, then the data-signal being transferred to acp chip is just 0000001(binary number).Main control unit carries out analyzing and processing to temperature signal and digital signal and analysis result is sent to flue gas monitoring display interface by described CAN communication circuit.Main control unit provides 12 controlled railway digital amount signals (24V d. c. voltage signal) by described digital quantity output circuit to miscellaneous part.
Described digital quantity output circuit comprises isolating chip ADuM1300, shift register 74HC595, driving chip ULN2003 and external interface.One road serial control signal is sent to shift register by isolating chip by acp chip, and serial signal is converted to corresponding 12 road parallel signals by shift register, then is connected with external interface by after driving chip.Such as acp chip sends 000000000001 serial signal, then first via digital output 24V DC voltage, and all the other 11 tunnels export 0V.
Main control unit also comprises the filtering circuit be connected with described power circuit, and this filtering circuit is made up of the electric capacity of six 0.1uF and 10uF.
Digital quantity output circuit also comprises one group of signal designation circuit for lamp, totally ten two road pilot lamp, and the 12 railway digital amounts that correspond to export.When digital output is 24V, corresponding pilot lamp lights.
Power circuit is divided into three parts: temperature acquisition energize portions circuit, number connect test energize portions circuit and main control unit energize portions circuit.Temperature acquisition energize portions circuit comprises WRB2405CS-2W chip and WRA2412CS-2W chip.Number connect test energize portions circuit comprises K7805-1000 chip and WRB2405CS-2W.Main control unit energize portions circuit comprises LM1117-3.3.
The utility model adopts the design philosophy design hardware circuit of embedded hardware component, main control unit when being applied in the built-in applied system with identical microcontroller, without the need to doing any change.Therefore the utility model has versatility, portability and reusability.
It may be noted that in the utility model, microcontroller adopts 32 LPC1768 to design at this, correspondingly, namely above-mentioned main control unit 100 is to make 32 LPC1768 microcontroller normal program operation get up the set of necessary circuit.
Below respectively each ingredient of main control unit 100 is described in detail:
Clock circuit 101
Clock circuit 101 provides work clock for LPC1768 microcontroller, and the external passive crystal oscillator of what the present embodiment was selected is 12MHz provides clock for LPC microcontroller, is connected with LPC1768 microcontroller by XTAL pin; Select 32.768KHz crystal oscillator to provide clock for the RTC in microcontroller, be connected with microcontroller by RTCX pin.
Reset circuit 102
Reset circuit 102 realize to above-mentioned microcontroller electrification reset and run time button reset function and watchdog reset function, it comprise power monitoring chip, with door chip and reset key.Reset signal is connected to the resetting pin of CPU, and reset key realizes hand-reset.Effective hand-reset signal or JTAG reset signal will cause and door chip output low level reset whole system.During normal work, reset pin keeps high level; If press reset button, reset pin becomes low level, above-mentioned microcontroller reset.If it may be noted that herein, reset pin is dragged down or unsettled always, and above-mentioned microcontroller cannot normally work.
ISP circuit 103
ISP circuit 103 realizes the function that automatic ISP downloads,
Eeprom circuit 104
LPC1768 supports the Hardware I2C interface of 400K fast mode, and the present embodiment devises eeprom circuit 104 and keeps power down to need the data of protection for system.In the present embodiment, eeprom circuit 104 adopts system extension electricity erasable memorizer, and size is 4k.
JTAG debugging interface 105
In the present embodiment, adopt 20 pin JTAG artificial debugging interfaces of standard, to realize writing the Flash of above-mentioned microcontroller, to wipe and the debugging of application program and download.
The power circuit that the utility model provides comprises master control unit and to power and peripheral circuit is powered two parts, all adopts the power module of 2W.
The digital input circuit block diagram that Fig. 2 provides for the utility model.Seven railway digital amount input signals (24V d. c. voltage signal) are after excess current driving chip ULN2003, deliver to shift register 74HC165, convert seven road voltage signals to digital quantity by register, and deliver to microcontroller LPC1768 by digital isolator ADuM1301 and carry out signal analysis and processing.
The digital quantity output circuit block diagram that Fig. 3 provides for the utility model.Microcontroller LPC1768 will output signal after isolating chip ADuM1300 isolates, and deliver to shift register 74HC595 and carry out serial ports and turn parallel output, and parallel signal is by the load of driving chip ULN2003 Direct driver.
The temperature collection circuit schematic diagram that Fig. 4 provides for the utility model.Four road PT100 temperature signals carry out AD conversion by delivering to AD7711 after analog switch ADG509 gating, and the signal after conversion is delivered to microcontroller and carried out signal transacting after numeral isolation ADuM1400.
The above embodiment only have expressed implementation method of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to the utility model and comprise scope.Therefore, the comprising scope and should be as the criterion with claims of the utility model patent.
Claims (7)
1. for a control system for portable the escaping of ammonia analyser, it is characterized in that: comprise main control unit, peripheral circuit, power circuit and external interface, wherein power circuit is that main control unit and peripheral circuit are powered; Main control unit is connected with external interface through peripheral circuit; Wherein peripheral circuit comprises digital input circuit, digital quantity output circuit, temperature collection circuit and CAN communication circuit; External interface is connected with portable the escaping of ammonia analyser relay, sampling pump and heating unit.
2. control system according to claim 1, is characterized in that: described main control unit comprises microcontroller, the clock circuit be connected with microcontroller, reset circuit, ISP circuit, eeprom circuit and JTAG debugging interface.
3. control system according to claim 1 and 2, is characterized in that: described main control unit also comprises the filtering circuit be connected with described power circuit.
4. control system according to claim 1, is characterized in that: the LM1117-3.3 that described power circuit comprises WRB2405CS-2W chip, WRA2412CS-2W chip, K7805-1000 chip are connected with described WRB2405CS-2W chip.
5. control system according to claim 2, is characterized in that, described digital input circuit, digital quantity output circuit, temperature collection circuit are connected respectively by digital buffer circuit with microcontroller.
6. control system according to claim 1, it is characterized in that: described temperature collection circuit comprises: two path analoging switch ADG509, four road PT100 temperature sensor and ADD711 modular converters, the control end of four road PT100 temperature sensors is connected with main control unit through analog switch ADG509, and the signal output part of four road PT100 temperature sensors is connected with main control unit through ADD711 modular converter.
7. control system according to claim 1, is characterized in that: described digital quantity output circuit also comprises one group of signal designation circuit for lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420582531.1U CN204086903U (en) | 2014-10-10 | 2014-10-10 | A kind of control system for portable the escaping of ammonia analyser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420582531.1U CN204086903U (en) | 2014-10-10 | 2014-10-10 | A kind of control system for portable the escaping of ammonia analyser |
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| CN204086903U true CN204086903U (en) | 2015-01-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758128A (en) * | 2019-02-27 | 2019-05-17 | 深圳和而泰数据资源与云技术有限公司 | A kind of detection system and its control method |
| CN112000059A (en) * | 2020-08-12 | 2020-11-27 | 北京国电龙源环保工程有限公司 | Automatic control system and control method for ammonia online analyzer |
-
2014
- 2014-10-10 CN CN201420582531.1U patent/CN204086903U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758128A (en) * | 2019-02-27 | 2019-05-17 | 深圳和而泰数据资源与云技术有限公司 | A kind of detection system and its control method |
| CN109758128B (en) * | 2019-02-27 | 2024-04-12 | 深圳和而泰智能家电控制器有限公司 | Detection system and control method thereof |
| CN112000059A (en) * | 2020-08-12 | 2020-11-27 | 北京国电龙源环保工程有限公司 | Automatic control system and control method for ammonia online analyzer |
| CN112000059B (en) * | 2020-08-12 | 2022-03-15 | 国能龙源环保有限公司 | Automatic control system and control method for ammonia online analyzer |
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