CN101763125A - Electric heating cable running control method - Google Patents
Electric heating cable running control method Download PDFInfo
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- CN101763125A CN101763125A CN200910019334A CN200910019334A CN101763125A CN 101763125 A CN101763125 A CN 101763125A CN 200910019334 A CN200910019334 A CN 200910019334A CN 200910019334 A CN200910019334 A CN 200910019334A CN 101763125 A CN101763125 A CN 101763125A
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Abstract
The invention provides an electric heating cable running control method which improves a control and power supply system on the basis that the PTC material of the electric heating cable has the capability of adjusting the temperature. The starting current is reduced and the service life of the electric heating cable can be prolonged by adopting the delayed starting and soft development technology; and the control precision can be improved by adopting a temperature acquiring and controlling technology of a singlechip. Compared with the prior art, in the electric heating cable running control method, since a digital temperature sensor is used, the temperature acquiring and controlling technology of the singlechip has the advantages of high temperature-measuring precision, favorable control performance and high reliability; and the requirement on the power supply capacity can be remarkably reduced by using the soft development starting technology and the time-shared control technology. The method is applied to petroleum, chemical engineering, pipeline transportation, accumulated snow on the road and airports, agricultural product production, civilian use and other industries, can improve the utilization rate of energy sources, greatly reduce wires distributed on industrial fields, save the investment, shorten the construction period and achieve the effects of saving energy and protecting the environment.
Description
(1) technical field
The present invention relates to a kind of control technology, specifically a kind of electric heating cable running control method.
(2) technical background
Though the worry that the PTC self temperature control heating tape has automatic adjusting output power, carries out heat compensation, no high temperature hotspot and burn automatically is because of there is the problem that starting current is excessive, temperature control precision is low in himself reason.
(3) summary of the invention
Technical assignment of the present invention is at the deficiencies in the prior art, and a kind of electric heating cable running control method is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Electric heating cable running control method, be the PTC thermo-sensitive material of electric tracing cable own had on the basis of temperature adjustment ability, its control is improved with electric power system, adopt delayed startup and soft switch technique to reduce starting current, adopt single-chip microcomputer temperature acquisition and control technology to improve control accuracy.
Above-mentionedly in electric-heating belt panel box control loop, increase time controller, allow each heating circuit delayed startup successively in certain sequence, and start at interval and can adjust according to actual conditions.
Above-mentioned single-chip microcomputer temperature acquisition and control technology are made up of STM32F101RBT6 single-chip microcomputer, temperature sensor, line drive, solid-state relay, keyboard and LCD display, be divided into temperature collection circuit and temperature-control circuit, temperature collection circuit adopts the digital temperature sensor DS18B20 of one-wire bus technology to finish, and the ribbon heater heating is finished by the single-chip microcomputer temperature controller.
The said temperature control circuit mainly is that the break-make of electric tracing cable heating line is controlled, and control assembly adopts solid-state relay.
Above-mentioned soft switch technique is that single-chip microcomputer sends turn-on command by chip for driving AM26LS3 to solid-state relay, solid-state relay G3MB-202P is by detecting the zero crossing of alternating current, guarantee that solid-state relay carries out switching manipulation on the zero crossing of alternating current, what method of temperature control adopted is the make-to-break ratio power control scheme.
Electric heating cable running control method of the present invention compared with prior art, the beneficial effect that is produced is:
1) the present invention has saved electric equipment and power consumption, has reduced use and maintenance cost, has played effect in energy saving and environmental protection.
2) like this with regard to having avoided original each loop to start the excessive problem of immediate current simultaneously, not only reduced impact, and reduced demand, saved operating cost supply load to power supply grid.
3) because DS18B20 is the single-line type interface device, only need be articulated on the two-way I/O mouth of single-chip microcomputer, very big simplification and saving be arranged than the sensing system wiring of double wire system.Built-in watchdog function of single-chip microcomputer and detection of power loss function avoid program to crash and abnormal conditions occur.Key board and light-emitting diode display are used for the setting of system operational parameters and the demonstration of running status and temperature-measuring results.
4) adopt single-chip microcomputer temperature acquisition and control technology and above-mentioned two technology of soft switch technique after, under the constant situation of power supply capacity, can improve the length of use unit cable and the total length of cable, can reduce the investment of electric system greatly.And the electric power public hazards such as waveform distortion of the power supply network that cause of the use that can avoid power electronic device.
5) single-chip microcomputer temperature acquisition and control system are owing to used digital temperature sensor, system to have temperature measurement accuracy height, control performance is good, reliability is high advantage, and its cost performance is far superior to the touring acquisition system of traditional simulation.After having used soft switch activated technology and timesharing control technology, obviously reduced requirement to power supply capacity.Mostly the electric tracing temperature control system is long-term continuous working, has used soft switch activated control technology, though increase is arranged the start-up time of system slightly, from the entire work process of system, can ignore fully.This system is used for oil, chemical industry, pipeline transmission, highway airport accumulated snow, agricultural product production, industry such as civilian, can improves rate of energy, the industry spot wiring is significantly reduced, reduce investment outlay, shorten construction period, arrive effect in energy saving and environmental protection.
(4) description of drawings
Accompanying drawing 1 is electric control theory figure of the present invention;
Accompanying drawing 2 is electric major loop figure of the present invention;
Accompanying drawing 3 is the system hardware structure figure of single-chip microcomputer temperature acquisition of the present invention and control technology;
Accompanying drawing 5 is the liquid crystal display circuit schematic diagram among Fig. 3;
Accompanying drawing 7 is a temperature collection circuit schematic diagram of the present invention;
Accompanying drawing 8 is the program flow diagram of system controlling software of the present invention;
Accompanying drawing 9 is temperature acquisition flow chart of the present invention;
Accompanying drawing 10 is keyboard program block diagram of the present invention.
(5) embodiment
Explain below below in conjunction with accompanying drawing 1-10 electric heating cable running control method of the present invention being done.
As shown in Figure 1, with 10 circuit controls is example, electric heating cable running control method of the present invention, be that PTC thermo-sensitive material own is had in the ribbon heater on the basis of temperature adjustment ability, its control is improved with electric power system, adopt delayed startup and soft switch technique to reduce starting current, adopt single-chip microcomputer temperature acquisition and control technology to improve control accuracy.
As shown in Figure 2, be example with 10 circuit controls:
At first distinguish closed major loop, control loop and divide circuit breaker QF1～QF12, status switch is allocated to auto state, again rotary switch SA1～SA10 is opened.When pressing start button SF, the KA1 coil electricity, the KA1 closing of contact forms self-locking, and turn-on time relay K T1～KT5.Preestablishing under the time interval of 2min, on-delay closing relay contact KT1～KT5 is closed successively, connects KM1～KM10 ac contactor coil respectively, corresponding contacts conducting in the major loop, and the loop, ribbon heater switches on successively and starts working.
Shown in accompanying drawing 3,4,5, single-chip microcomputer temperature acquisition and control technology are made up of STM32F101RBT6 single-chip microcomputer and temperature sensor, line drive, solid-state relay, keyboard and LCD display, are divided into temperature acquisition and temperature-control circuit.Temperature collection circuit adopts the digital temperature sensor DS18B20 of one-wire bus technology to finish, and the ribbon heater heating is finished by the single-chip microcomputer temperature controller.Because DS18B20 is the single-line type interface device, only need be articulated on the two-way I/O mouth of single-chip microcomputer, than the sensing system wiring of double wire system very big simplification and saving are arranged.Built-in watchdog function of single-chip microcomputer and detection of power loss function avoid program to crash and abnormal conditions occur.Key board and light-emitting diode display are used for the setting of system operational parameters and the demonstration of running status and temperature-measuring results.
As shown in Figure 6, temperature-control circuit mainly is that the break-make of electric tracing cable heating line is controlled, and control assembly adopts solid-state relay.Solid-state relay SSR replaces the noncontacting switch device with relay characteristic of traditional electrical contact as switching device shifter with semiconductor devices, single-phase SSR is four end active devices, wherein import control ends for two, two output terminals, isolate for light between input and output, input end adds direct current or pulse signal behind certain current value, and output terminal just can be transformed into on-state from off-state.
In order to reduce to start the impact of dash current, adopted soft switch technique to electrical network.Single-chip microcomputer sends turn-on command by chip for driving AM26LS3 to solid-state relay, solid-state relay G3MB-202P is by detecting the zero crossing of alternating current, guarantee that solid-state relay carries out switching manipulation on the zero crossing of alternating current, what method of temperature control adopted is the make-to-break ratio power control scheme.Little for fear of the ribbon heater cold-state resistance, to start dash current excessive, causes the big demand to net capacity, and timesharing control is carried out in the multichannel ribbon heater in the temperature-controlled precision scope.
As shown in Figure 7, temperature collection circuit adopts the digital temperature sensor DS18B20 of one-wire bus technology to be applied to temperature control electric tracing cable system.Temperature sensor is installed on the pipeline of ribbon heater, and the installation site should be representative, and sensor can not touch the ribbon heater.
Shown in accompanying drawing 8,9,10, system controlling software adopts modularization programming.The back program display initialization flag and wait for 3 seconds that powers on enters touring pattern then, detects the DS18B20 temperature sensor automatically, and line temperature sensor is touring automatically to be read real time temperature and send charactron to show that sensor is not online then to be skipped automatically.By keyboard desired temperature (T) is set), temperature control winding (Δ T)), temperature upper limit (TH)) and lowest temperature value (TL), solid-state relay is connected when detected temperatures t≤T-Δ T, heats to the ribbon heater energising; Solid-state relay disconnects when detected temperatures t 〉=T+ Δ T, and the ribbon heater stops to heat; If (t 〉=TH) or when being lower than the lower limit temperature (t≤TL)) of setting, alarm will send alerting signal, should check whether temperature sensor, temperature controller and solid-state relay damage this moment to the ceiling temperature that detected temperatures surpass to be provided with.
Main frame is read its sequence number (64 ROM in the 9th～56) with reading ROM order one by one to each DS18B20 that hangs on mouthful line in advance, when main frame will be operated a certain device, then will send " coupling ROM " order.And so-called " skipping ROM " order refers to that later operation is at all devices on certain a bite line.There is " skipping ROM " order promptly to start all devices earlier and carries out temperature A/D conversion, after this read the temperature data of each device more one by one by " coupling ROM " order.
Claims (5)
1. electric heating cable running control method, it is characterized in that: PTC thermo-sensitive material own is had in the electric tracing ribbon heater on the basis of temperature adjustment ability, its control is improved with electric power system, adopt delayed startup and soft switch technique to reduce starting current, adopt single-chip microcomputer temperature acquisition and control technology to improve control accuracy.
2. electric heating cable running control method according to claim 1, it is characterized in that: in electric-heating belt panel box control loop, increase time controller, allow each heating circuit delayed startup successively in certain sequence, and start at interval and can adjust according to actual conditions.
3. electric heating cable running control method according to claim 1, it is characterized in that: single-chip microcomputer temperature acquisition and control technology are made up of single-chip microcomputer, temperature sensor, line drive, solid-state relay, keyboard and LCD display, be divided into temperature collection circuit and temperature-control circuit, temperature collection circuit adopts the digital temperature sensor of one-wire bus technology to finish, and the ribbon heater heating is finished by the single-chip microcomputer temperature controller.
4. electric heating cable running control method according to claim 1 is characterized in that: temperature-control circuit mainly is that the break-make of ribbon heater heating line is controlled, and control assembly adopts solid-state relay.
5. electric heating cable running control method according to claim 1, it is characterized in that: soft switch technique is that single-chip microcomputer sends turn-on command by chip for driving AM26LS3 to solid-state relay, solid-state relay G3MB-202P is by detecting the zero crossing of alternating current, guarantee that solid-state relay carries out switching manipulation on the zero crossing of alternating current, what method of temperature control adopted is the make-to-break ratio power control scheme.
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| CN 200910019334 CN101763125B (en) | 2009-10-15 | 2009-10-15 | Electric heating cable running control method |
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| CN 200910019334 CN101763125B (en) | 2009-10-15 | 2009-10-15 | Electric heating cable running control method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529712A (en) * | 2012-07-03 | 2014-01-22 | 韩欣华 | Double-loop sequence control circuit |
| CN104393500A (en) * | 2014-12-01 | 2015-03-04 | 苏州立瓷电子技术有限公司 | Time division power supply system of LED display screen |
| CN106410710A (en) * | 2016-08-24 | 2017-02-15 | 广州文冲船厂有限责任公司 | Electric heat tracing system of ship in ice region |
| CN107632642A (en) * | 2017-11-03 | 2018-01-26 | 上海正帆科技股份有限公司 | Exhaust pipe heating system |
| CN108073122A (en) * | 2017-12-20 | 2018-05-25 | 山西省交通建设工程监理有限责任公司 | The long-range monitoring and warning control system of fire protection pipeline leak-proof anti-freezing |
| CN109890090A (en) * | 2019-02-25 | 2019-06-14 | 东南大学 | A kind of PTC electric heater unit on ash bucket for electric precipitator |
| CN110597322A (en) * | 2019-10-31 | 2019-12-20 | 国网黑龙江省电力有限公司电力科学研究院 | Heating control system and method for heat tracing band based on fuzzy PID algorithm |
| CN110750121A (en) * | 2019-12-03 | 2020-02-04 | 中北大学 | Overtemperature automatic power-off temperature-controllable heating system for shock tube heating |
| CN111488013A (en) * | 2020-04-24 | 2020-08-04 | 中国船舶工业综合技术经济研究院 | Temperature control circuit of electronic equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2187034Y (en) * | 1994-03-09 | 1995-01-11 | 戴健 | Automatic food heater |
| US6285005B1 (en) * | 1998-04-09 | 2001-09-04 | Lucent Technologies Inc. | Device for housing communication and electronic equipment using positive temperature coefficient material |
| CN101001490A (en) * | 2007-01-04 | 2007-07-18 | 中兴通讯股份有限公司 | Heating device |
-
2009
- 2009-10-15 CN CN 200910019334 patent/CN101763125B/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529712A (en) * | 2012-07-03 | 2014-01-22 | 韩欣华 | Double-loop sequence control circuit |
| CN103529712B (en) * | 2012-07-03 | 2016-05-11 | 韩欣华 | Double loop sequencing circuit |
| CN104393500A (en) * | 2014-12-01 | 2015-03-04 | 苏州立瓷电子技术有限公司 | Time division power supply system of LED display screen |
| CN106410710A (en) * | 2016-08-24 | 2017-02-15 | 广州文冲船厂有限责任公司 | Electric heat tracing system of ship in ice region |
| CN107632642A (en) * | 2017-11-03 | 2018-01-26 | 上海正帆科技股份有限公司 | Exhaust pipe heating system |
| CN108073122A (en) * | 2017-12-20 | 2018-05-25 | 山西省交通建设工程监理有限责任公司 | The long-range monitoring and warning control system of fire protection pipeline leak-proof anti-freezing |
| CN109890090A (en) * | 2019-02-25 | 2019-06-14 | 东南大学 | A kind of PTC electric heater unit on ash bucket for electric precipitator |
| CN109890090B (en) * | 2019-02-25 | 2021-09-28 | 东南大学 | PTC electric heating device for ash bucket of electric dust collector |
| CN110597322A (en) * | 2019-10-31 | 2019-12-20 | 国网黑龙江省电力有限公司电力科学研究院 | Heating control system and method for heat tracing band based on fuzzy PID algorithm |
| CN110750121A (en) * | 2019-12-03 | 2020-02-04 | 中北大学 | Overtemperature automatic power-off temperature-controllable heating system for shock tube heating |
| CN110750121B (en) * | 2019-12-03 | 2021-08-24 | 中北大学 | Overtemperature automatic power-off temperature-controllable heating system for shock tube heating |
| CN111488013A (en) * | 2020-04-24 | 2020-08-04 | 中国船舶工业综合技术经济研究院 | Temperature control circuit of electronic equipment |
| CN111488013B (en) * | 2020-04-24 | 2021-10-01 | 中国船舶工业综合技术经济研究院 | Temperature control circuit of electronic equipment |
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| CN101763125B (en) | 2013-05-15 |
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