CN104635678B - A kind of multichannel electrical heating PWM control systems - Google Patents
A kind of multichannel electrical heating PWM control systems Download PDFInfo
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- CN104635678B CN104635678B CN201410802346.3A CN201410802346A CN104635678B CN 104635678 B CN104635678 B CN 104635678B CN 201410802346 A CN201410802346 A CN 201410802346A CN 104635678 B CN104635678 B CN 104635678B
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- pwm
- host computer
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- state relay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The present invention proposes a kind of multichannel electrical heating PWM control systems, it is characterized in that, including host computer, temperature collecting cell, PWM adjustment units and solid-state relay unit, it is simultaneously sent to the host computer by the temperature collecting cell collecting temperature signal by the first RS485 buses, operation result is sent to after the PWM adjustment units by the host computer after carrying out computing by the 2nd RS485 buses, and the PWM adjustment units control the dutycycle that the solid-state relay unit is connected in real time；The PWM adjustment units include multiple PWM modules being sequentially connected, and the solid-state relay unit includes multiple solid-state relay subelements, the solid-state relay subelement connection corresponding with its position respectively of each described PWM module.Implement the multichannel electrical heating PWM control systems of the present invention, have the advantages that：Cost is relatively low, development amount is smaller.
Description
Technical field
Field, more particularly to a kind of multichannel electrical heating PWM control systems are adjusted the present invention relates to PWM.
Background technology
In traditional multipoint temperature control system, host computer drives solid-state relay by I/O output points, and host computer needs reality
When the solid-state relay of bottom is controlled, it is programmed, and difficulty is larger, and the configuration of its board, wiring cost are higher, dumb.By
In being controlled in real time output point, its refresh rate requires sufficiently fast, therefore computer can only also use the output board using PCI
Card.At present, such function can be realized using industrial computer PCI output cards and Medium PLC output control, but its presence is scarce
Point is that cost is higher, and development amount is larger.Fig. 1 is the multi-point temp centralized control system using industrial computer PCI output cards
Structural representation, Fig. 2 is the structural representation of the multi-point temp centralized control system using Medium PLC output control.
The content of the invention
The technical problem to be solved in the present invention is, for prior art above-mentioned cost is higher, development amount is larger
Defect there is provided a kind of cost is relatively low, the less multichannel electrical heating PWM control systems of development amount.
The technical solution adopted for the present invention to solve the technical problems is：A kind of multichannel electrical heating PWM control systems are constructed,
Including host computer, temperature collecting cell, PWM adjustment units and solid-state relay unit, the temperature collecting cell collecting temperature
It is simultaneously sent to the host computer by signal by the first RS485 buses, and the host computer leads to operation result after carrying out computing
Cross the 2nd RS485 buses to be sent to after the PWM adjustment units, the PWM adjustment units control the solid-state relay in real time
The dutycycle that unit is connected；The PWM adjustment units include multiple PWM modules being sequentially connected, the solid-state relay unit
Including multiple solid-state relay subelements, each described PWM module solid-state relay subelement corresponding with its position respectively
Connection.
In multichannel electrical heating PWM control systems of the present invention, the solid-state relay subelement includes multiple solid
State relay.
In multichannel electrical heating PWM control systems of the present invention, the PWM module includes RS422 communication interfaces, often
The RS422 communication interfaces of one PWM module are all connected with.
In multichannel electrical heating PWM control systems of the present invention, the RS422 communications of each PWM module connect
Connected between mouthful by full duplex bus.
In multichannel electrical heating PWM control systems of the present invention, the PWM module also includes RS485 communication interfaces,
The RS485 communication interfaces are connected with the host computer.
In multichannel electrical heating PWM control systems of the present invention, the PWM module also includes microprocessor and button
Function digit display unit, the RS422 communication interfaces and RS485 communication interfaces are connected with the microprocessor, described to press
Key operation digital-scroll technique unit is connected with the microprocessor.
In multichannel electrical heating PWM control systems of the present invention, the PWM module also includes switch element, described
Switch element is connected with the microprocessor, and the switch element includes 32 switches and 32 tunnel output ends, opens described in each
Pass is connected with output end all the way respectively, is connected respectively with a solid-state relay per output end described all the way.
In multichannel electrical heating PWM control systems of the present invention, the PWM module also includes the power supply for powering
Module.
In multichannel electrical heating PWM control systems of the present invention, the temperature collecting cell is adopted including multiple temperature
Collect module, the multiple temperature collect module is communicated by the first RS485 buses with the host computer.
In multichannel electrical heating PWM control systems of the present invention, the host computer be industrial computer, man-machine interface or
PLC。
Implement the multichannel electrical heating PWM control systems of the present invention, have the advantages that:Due to using host computer, temperature
Collecting unit, PWM adjustment units and solid-state relay unit are spent, it is simultaneously passed through first by temperature collecting cell collecting temperature signal
RS485 buses are sent to host computer, and operation result is sent into PWM by the 2nd RS485 buses after host computer progress computing adjusts
Save after unit, PWM adjustment units control the dutycycle that solid-state relay unit is connected in real time, because the real-time control of output exists
Completed in PWM adjustment units, can so simplify structure, so its cost is relatively low, development amount is smaller.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 be conventional art in using industrial computer PCI output cards multi-point temp centralized control system structural representation；
Fig. 2 be conventional art in using Medium PLC output control multi-point temp centralized control system structural representation；
Structural representation in Fig. 3 multichannel electrical heating PWM control system one embodiment of the present invention；
Fig. 4 is the internal structure schematic diagram of PWM module in the embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In multichannel electrical heating PWM control system embodiments of the present invention, the structure of its multichannel electrical heating PWM control system is shown
It is intended to as shown in Figure 3.In Fig. 3, multichannel electrical heating PWM control systems include host computer 1, temperature collecting cell 2, PWM regulations
Unit 3 and solid-state relay unit 4, wherein, the collecting temperature signal of temperature collecting cell 2, and the temperature signal of collection is passed through
First RS485 buses are sent to host computer 1, and operation result is sent to by host computer 1 after carrying out computing by the 2nd RS485 buses
After PWM adjustment units 3, the dutycycle that control solid-state relay unit 4 is connected in real time of PWM adjustment units 3 realizes temperature with this
Regulation and control.Temperature collecting cell 2 is inputted for thermometric, and PWM adjustment units 3 and solid-state relay unit 4 are exported for temperature signal.
In the present embodiment, host computer 1 is that industrial computer, man-machine interface or PLC, PWM adjustment unit 3 include multiple be sequentially connected
PWM module 31, solid-state relay unit 4 include multiple solid-state relay subelements, each PWM module 31 respectively with its position
Put corresponding solid-state relay subelement connection.Each solid-state relay subelement includes multiple solid-state relays 41, this reality
Apply in example, each solid-state relay subelement specifically includes 32 solid-state relays 41.Temperature collecting cell 2 includes multiple temperature
Acquisition module 21 is spent, multiple temperature collect modules 21 are communicated by the first RS485 buses with host computer 1.It is noted that
In the present embodiment, PWM module 31 uses BD4028 output modules, certainly, under the certain situation of the present embodiment, PWM moulds
Block 31 can also be other modules for having similar functions with BD4028 output modules.
It is noted that in the present embodiment, in above-mentioned multiple PWM modules 31, one of them is main website, other PWM
Module 31 is slave station.After the present invention is using multi-channel PWM module 31, host computer 1 plays the ability for being good at computing, and operation result is sent out
To module, the real-time control of bottom is carried out by PWM module 31, so can both simplify structure, increases system reliability, reduces into again
This.Because the real-time control of output is completed in PWM module 31, therefore need not be too fast with the communication speed of host computer 1, use
It is sufficient that RS485 communication bus.The multichannel electrical heating PWM control system system architectures of the present invention are more reasonable, and this is mainly obtained
The reason that real-time control beneficial to output is completed in PWM module 31, therefore installation wiring is simpler, cost is lower.
Fig. 4 is the internal structure schematic diagram of PWM module in the present embodiment, in Fig. 4, and the PWM module 31 includes RS422 communications
Interface 311, the RS422 communication interfaces 311 of each PWM module 31 are all connected with.RS422 communication interfaces 311 are used for multiple PWM moulds
Block 31 is networked (wherein 1 is main website, and other is slave station), is led between the RS422 communication interfaces 311 of each PWM module 31
Full duplex bus connection is crossed, that is, main website is connected with slave station using full duplex bus, makes the point of slave station just as the point one of main website
Sample is controlled, while the information of periodic collection slave station again so that this group of PWM module 31 is just as an entirety.Devise a set of
Special communication protocol so that main website can refresh the output of all slave stations in real time, while the information of each slave station of periodic collection again, with
Realize general power limitation function.
In the present embodiment, PWM module 31 also includes RS485 communication interfaces 312, RS485 communication interfaces 312 and host computer 1
Connection.RS485 communication interfaces 312 use MODBUS-RTU communication protocols, and for being communicated with host computer 1, multiple PWM modules 31 are led
From during networking, host computer 1 need to only be operated to main website just can be so that such communication efficiency is higher.
In the present embodiment, PWM module 31 also includes microprocessor 313 and button operation digital-scroll technique unit 314, RS422
Communication interface 311 and RS485 communication interfaces 312 are connected with microprocessor 313, button operation digital-scroll technique unit 314 with it is micro-
Processor 313 is connected.Microprocessor 313 is used to handle signal, and button operation digital-scroll technique unit 314 is used to supply user
Input data, and the data of display output.
In the present embodiment, PWM module 31 also includes switch element 315, and switch element 315 is connected with microprocessor 313, opened
Closing unit 315 includes 32 switch Q1~Q32 and 32 tunnel output ends, and each switch Q1~Q32 connects with output end all the way respectively
Connect, be connected respectively with a solid-state relay 41 per output end all the way.In the present embodiment, PWM module 31 also includes being used to power
Power module 316.
In the present embodiment, PWM module 31 can carry out functional configuration by parameter, can configure the various of PWM module 31
Pattern, the power each put, general power limitation, PWM cycle and messaging parameter etc..PWM module 31 can also make regular tap amount
Output is used, but the PCI output cards used from only making regular tap export are different, the output control of the peculiar PWM duty cycle of PWM module 31
Function processed, also directed to electrical heating industry, and special design general power limitation function, and temporally dispersed startup each point connects
Logical function.
In the present embodiment, to realize that general power is limited, institute's switch a little controls to concentrate to handle, therefore multiple
PWM module 31 needs networking, and 1 is main website, and other is slave station, and the PWM count that main website reception host computer 1 is sent is according to order, except control
32 switches of system itself are outer, also control the switch motion of all slave stations.It is each point minute as the inside of PWM module 31 of main website
Equipped with independent PWM cycle counter, and with different initial values, the time scale of each point is sent (i.e. according to host computer 1
PWM duty cycle), the point is opened when reaching in the cycle, the point is closed when dutycycle reaches.General power is calculated in real time, if transfiniting,
The opening time of each point is then limited in proportion, it is ensured that general power has reached the mesh of general power limitation under limits value, thus
, and each point open temporally be uniformly distributed function.When carrying out PWM controls due to having done dispersed startup work(to each point
Can, so the impact to electric power system can be reduced.
In the present embodiment, 1 main website can at most connect 9 slave stations () at maximum 320 points, and all points refresh 1 per 10ms
Secondary, this is sufficient for the switch computer heating control requirement of solid-state relay 41.It is of the invention easily to realize power limit, general power limitation
Realized in PWM module 31, it only needs to simply design parameter, and traditional PCI output schemes, then needs developer voluntarily
Solve, but also each point is controlled in real time, such design difficulty is much greater.
In a word, in the present embodiment, PWM adjustment modules 31 are to be used to drive solid-state relay to switch, and control it to connect
Dutycycle, to adjust power output.Host computer 1 only needs to change the PWM duty cycle on each road with regard to energy through RS485 communication bus
Adjust heating power.One PWM adjustment module 31 can realize 32 road electric heating controls, and multiple PWM adjustment modules 31 can also join
Net extension, 1 is main website, and other is slave station, and host computer 1 only needs to operate main website.The startup of each output point is connected temporally
It is dispersed to carry out, power network is impacted with reducing.General power is calculated in real time, by limiting the opening time of each point in proportion, really
General power is protected under limits value, general power limitation function is realized, distribution capacity can be so reduced, electrical safety is improved.
Through parameter setting, PWM adjustment modules 31 can also make regular tap output and use.Due to being distributed structure, with industry control
The PCI output card schemes of machine are compared, and are had a clear superiority in terms of installation wiring, development difficulty and cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (6)
1. a kind of multichannel electrical heating PWM control systems, it is characterised in that single including host computer, temperature collecting cell, PWM regulations
It is simultaneously sent to by member and solid-state relay unit, the temperature collecting cell collecting temperature signal by the first RS485 buses
The host computer, is sent to the PWM by the 2nd RS485 buses by operation result after the host computer progress computing and adjusts single
After member, the PWM adjustment units control the dutycycle that the solid-state relay unit is connected in real time；The PWM adjustment units bag
Multiple PWM modules being sequentially connected are included, the solid-state relay unit includes multiple solid-state relay subelements, described in each
PWM module solid-state relay subelement connection corresponding with its position respectively；The solid-state relay subelement includes multiple solid
State relay；
In multiple PWM modules, one of them is main website, and other PWM modules are slave station；The host computer plays and is good at fortune
The ability of calculation, the real-time control of bottom is carried out by the PWM module；
The PWM module includes RS422 communication interfaces, and the RS422 communication interfaces of each PWM module are all connected with；It is described
RS422 communication interfaces are networked for multiple PWM modules, by complete between the RS422 communication interfaces of each PWM module
Duplex bus is connected, that is, main website is connected with slave station using full duplex bus, the point of slave station is controlled just as the point of main website
System, while the information of periodic collection slave station again；
The PWM module also includes RS485 communication interfaces, and the RS485 communication interfaces are connected with the host computer；It is described
RS485 communication interfaces use MODBUS-RTU communication protocols, for being communicated with the host computer, multiple PWM module principals and subordinates
During networking, the host computer need to only be operated to the main website；The PWM module carries out functional configuration by parameter, and configuration is described
Various patterns, the power each put, general power limitation, PWM cycle and the messaging parameter of PWM module；
The PWM count that the main website reception host computer is sent is according to order, in addition to 32 switches of control itself, also controls all
The switch motion of slave station, independent PWM cycle counter is assigned as the PWM module inside of main website for each point, and
With different initial values, the time scale of each point is sent according to the host computer, the point is opened when reaching in the cycle, in duty
The point is closed during than reaching；General power is calculated in real time, if transfiniting, the opening time of each point is limited in proportion, it is ensured that general power
Under limits value；1 main website at most 9 slave stations of connection, i.e., maximum 320 points, all points refresh 1 time per 10ms.
2. multichannel electrical heating PWM control systems according to claim 1, it is characterised in that the PWM module also includes micro-
Processor and button operation digital-scroll technique unit, the RS422 communication interfaces and RS485 communication interfaces with the microprocessor
Connection, the button operation digital-scroll technique unit is connected with the microprocessor.
3. multichannel electrical heating PWM control systems according to claim 2, it is characterised in that the PWM module also includes opening
Unit is closed, the switch element is connected with the microprocessor, the switch element includes 32 switches and 32 tunnel output ends, often
One switch is connected with output end all the way respectively, is connected respectively with a solid-state relay per output end described all the way
Connect.
4. multichannel electrical heating PWM control systems according to claim 3, it is characterised in that the PWM module also includes using
In the power module of power supply.
5. multichannel electrical heating PWM control systems according to claim 4, it is characterised in that the temperature collecting cell bag
Multiple temperature collect modules are included, the multiple temperature collect module is led to by the first RS485 buses and the host computer
Letter.
6. the multichannel electrical heating PWM control systems according to claim 1 to 5 any one, it is characterised in that described upper
Machine is industrial computer, man-machine interface or PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410802346.3A CN104635678B (en) | 2014-12-17 | 2014-12-17 | A kind of multichannel electrical heating PWM control systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410802346.3A CN104635678B (en) | 2014-12-17 | 2014-12-17 | A kind of multichannel electrical heating PWM control systems |
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| CN104635678A CN104635678A (en) | 2015-05-20 |
| CN104635678B true CN104635678B (en) | 2017-09-29 |
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| CN106444905A (en) * | 2016-09-19 | 2017-02-22 | 中国科学院合肥物质科学研究院 | High-temperature superconducting welding temperature synchronous measurement controller |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5226472A (en) * | 1991-11-15 | 1993-07-13 | Lab-Line Instruments, Inc. | Modulated temperature control for environmental chamber |
| CN1667569A (en) * | 2005-04-18 | 2005-09-14 | 天津大学 | Embedded intelligent environmental chamber controller |
| CN101833294A (en) * | 2010-04-07 | 2010-09-15 | 北京航空航天大学 | Man-machine interactive food processing control device capable of preprogramming |
| CN103186149A (en) * | 2011-12-29 | 2013-07-03 | 亚弘电科技股份有限公司 | Heat regulation device and heat regulation method |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
-
2014
- 2014-12-17 CN CN201410802346.3A patent/CN104635678B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5226472A (en) * | 1991-11-15 | 1993-07-13 | Lab-Line Instruments, Inc. | Modulated temperature control for environmental chamber |
| CN1667569A (en) * | 2005-04-18 | 2005-09-14 | 天津大学 | Embedded intelligent environmental chamber controller |
| CN101833294A (en) * | 2010-04-07 | 2010-09-15 | 北京航空航天大学 | Man-machine interactive food processing control device capable of preprogramming |
| CN103186149A (en) * | 2011-12-29 | 2013-07-03 | 亚弘电科技股份有限公司 | Heat regulation device and heat regulation method |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
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