CN101526258B - Communication circuit of central air conditioner - Google Patents
Communication circuit of central air conditioner Download PDFInfo
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- CN101526258B CN101526258B CN2009100970276A CN200910097027A CN101526258B CN 101526258 B CN101526258 B CN 101526258B CN 2009100970276 A CN2009100970276 A CN 2009100970276A CN 200910097027 A CN200910097027 A CN 200910097027A CN 101526258 B CN101526258 B CN 101526258B
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Abstract
The invention discloses a communication circuit of a central air conditioner which costs less and occupies less I/O interface resource of a central microprocessor. The communication circuit comprises a connection end (1), a first common emitter voltage amplifying circuit (2) a second common emitter voltage amplifying circuit (3), a reference voltage input circuit (4) and an integrated operational amplifier (5), wherein, a receiving end is arranged on the first common emitter voltage amplifying circuit (2); a sending end is arranged on the second common emitter voltage amplifying circuit (3); a positive going-input end of the integrated operational amplifier (5) is in parallel connection with the second common emitter voltage amplifying circuit (3), and then electrically connected with the connection end (1); an output end of the integrated operational amplifier (5) is electrically connected with the first common emitter voltage amplifying circuit (2); and an inverted input end of the integrated operational amplifier (5) is electrically connected with the reference voltage input circuit (4).
Description
Technical field
The present invention relates to communication technique field, specifically is a kind of communicating circuit of central air-conditioning.
Background technology
Development along with society, for traditional distributing domestic air conditioning form, that central air-conditioning has is energy-conservation, comfortable, capacity regulating convenient, noise is low, vibration is little, long service life, do not destroy the advantage that architectural appearance etc. is given prominence to, therefore, it has been subjected to the favor in market and the attention of manufacturer.In actual use, central air-conditioning cooperates the remote control receiving function except having Long-distance Control, because the particularity of its installation and the restriction of environment for use, as cooperating Long-distance Control to operate accordingly by remote controller in occasion inconveniences such as market, offices, just produced line control machine thus, line control machine can be selected to install in place according to the actual conditions in room.The employed working power of line control machine is drawn from master controller, and line control machine and master controller carry out communication by communicating circuit according to certain communication protocol.When operating air conditioner, only need the line control machine direct control, the content that line control machine will be carried out is transferred to master controller by communicating circuit, main controller returns to line control machine with the situation of current operation simultaneously, if on the line control machine Presentation Function is arranged, the operator just readily understands the current running status of air-conditioning.
At present, more employing 485 communicating circuits of the communicating circuit of central air-conditioning on the market, when making up the communication system of central air-conditioning, respectively be provided with one 485 communicating circuit on the master controller of central air-conditioning and the line control machine, master controller and central microprocessor on the line control machine all need three I/O interfaces to allow control end to be electrically connected with receiving terminal, transmitting terminal and reception and the transmission of separately 485 communicating circuits, also be provided with link on described 485 communicating circuits, so that two 485 communicating circuits are set up communication; The cabling requirement of the connection that is used to be electrically connected between the link of 485 communicating circuits on the link of 485 communicating circuits on the master controller and the line control machine is higher, and most importantly the price of 485 communication chips used of 485 communicating circuits is higher.In sum, at present the communicating circuit cost of central air-conditioning is higher, and it is more to take the I/O interface resource of central microprocessor of master controller or line control machine.
Summary of the invention
The technical problem to be solved in the present invention is that the communicating circuit of the less central air-conditioning of a kind of cost I/O interface resource low, that take central microprocessor is provided.
Technical scheme of the present invention is, the communicating circuit of central air-conditioning of the present invention, it comprises sets up the link that communication is used between the communicating circuit, it also comprises the first common emitter voltage amplifier circuit, the second common emitter voltage amplifier circuit, reference voltage input circuit and integrated operational amplifier; The described first common emitter voltage amplifier circuit is provided with receiving terminal, is used for being electrically connected with an I/O interface of central microprocessor; The described second common emitter voltage amplifier circuit is provided with transmitting terminal, is used for being electrically connected with the another one I/O interface of central microprocessor; Be electrically connected with link again after the positive input of described integrated operational amplifier and the second common emitter voltage amplifier circuit parallel connection, the output of described integrated operational amplifier is electrically connected with the first common emitter voltage amplifier circuit, and the reverse input end of described integrated operational amplifier is electrically connected with the reference voltage input circuit.
After adopting said structure, the present invention compared with prior art, have the following advantages: because the present invention adopts outstanding integrated operational amplifier of cost performance and the cheap first common emitter voltage amplifier circuit, the second common emitter voltage amplifier circuit, reference voltage input circuit, 485 relatively costly communication chips have been saved, so cost of the present invention is low; Because the present invention has only taken the signal receiving end and the signal sending end two I/O interfaces of central microprocessor, take an I/O interface so lack than prior art, that is to say that it is less that the present invention takies the I/O interface resource of central microprocessor; In sum, cost of the present invention I/O interface resource low, that take central microprocessor is less.
Description of drawings
Fig. 1 is the circuit theory diagrams of the communicating circuit of central air-conditioning of the present invention.
Fig. 2 is the structural representation of communication system that adopts the communicating circuit of central air-conditioning of the present invention.
Shown in the figure, 1, link, 2, the first common emitter voltage amplifier circuit, 3, the second common emitter voltage amplifier circuit, 4, the reference voltage input circuit, 5, integrated operational amplifier, 6, first communicating circuit, 7, second communicating circuit.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
The communicating circuit of central air-conditioning of the present invention, it comprises sets up the link 1 that communication is used between the communicating circuit, it also comprises the first common emitter voltage amplifier circuit 2, the second common emitter voltage amplifier circuit 3, reference voltage input circuit 4 and integrated operational amplifier 5; The described first common emitter voltage amplifier circuit 2 is provided with receiving terminal, is used for being electrically connected with an I/O interface of central microprocessor; The described second common emitter voltage amplifier circuit 3 is provided with transmitting terminal, is used for being electrically connected with the another one I/O interface of central microprocessor; Be electrically connected with link 1 again after the positive input of described integrated operational amplifier 5 and 3 parallel connections of the second common emitter voltage amplifier circuit, the output of described integrated operational amplifier 5 is electrically connected with the first common emitter voltage amplifier circuit 2, and the reverse input end of described integrated operational amplifier 5 is electrically connected with reference voltage input circuit 4.
Described central microprocessor is the single-chip microcomputer of master controller or line control machine.
The described first common emitter voltage amplifier circuit 2 is made up of first triode, first current-limiting resistance, first filter capacitor of first pull-up resistor, NPN type; The colelctor electrode of described first triode is electrically connected with first pull-up resistor, and the base stage of described first triode is electrically connected with first current-limiting resistance, the grounded emitter of described first triode; One end of described first filter capacitor is electrically connected with the colelctor electrode of first triode, the other end ground connection of described first filter capacitor; Described receiving terminal is the colelctor electrode of first triode; The output of described integrated operational amplifier 5 is electrically connected the output that is meant described integrated operational amplifier 5 and is electrically connected with first current-limiting resistance with the first common emitter voltage amplifier circuit 2.
The described second common emitter voltage amplifier circuit 3 is made up of second triode, second current-limiting resistance, second filter capacitor of second pull-up resistor, NPN type; The colelctor electrode of described second triode is electrically connected with second pull-up resistor, and the base stage of described second triode is electrically connected with an end of second current-limiting resistance, and described transmitting terminal is the other end of second current-limiting resistance, the grounded emitter of described second triode; One end of described second filter capacitor is electrically connected with the base stage of second triode, the other end ground connection of described second filter capacitor; Be electrically connected with link 1 again be electrically connected the colelctor electrode parallel connection of the positive input that is meant described integrated operational amplifier 5 and second triode after the positive input of described integrated operational amplifier 5 and 3 parallel connections of the second common emitter voltage amplifier circuit again with link 1 after.
Described reference voltage input circuit 4 is made up of the 3rd pull-up resistor, pull down resistor, the 3rd filter capacitor; One end of described the 3rd pull-up resistor is electrically connected with an end of pull down resistor, an end of the 3rd filter capacitor, the reverse input end of integrated operational amplifier 5 respectively; The other end ground connection of described pull down resistor; The other end ground connection of described the 3rd filter capacitor.
Described integrated operational amplifier 5 adopts LM358.
In the present embodiment, described first pull-up resistor, the 3rd pull-up resistor, integrated operational amplifier 5 are electrically connected with+5V constant voltage dc source respectively, and described second pull-up resistor is electrically connected with+12V constant voltage dc source.
The communicating circuit concrete structure of central air-conditioning of the present invention as shown in Figure 1, wherein, first pull-up resistor is designated as R6, first triode is designated as Q2, first current-limiting resistance is designated as R5, and first filter capacitor is designated as C3, and second pull-up resistor is designated as R2, second triode is designated as Q1, second current-limiting resistance is designated as R1, and second filter capacitor is designated as C1, and the 3rd pull-up resistor is designated as R3, pull down resistor is designated as R4, the 3rd filter capacitor is designated as C2, and integrated operational amplifier 5 is designated as IC1, and receiving terminal is designated as RX1, transmitting terminal is designated as TX1, and link 1 is designated as X1.
In order to make up the communication system of central air-conditioning, can adopt prior art to come the communicating circuit of central air-conditioning of the present invention is provided with, promptly the communicating circuit of a central air-conditioning of the present invention is being set respectively on the master controller of central air-conditioning and on the line control machine, for explaining conveniently, be designated as first communicating circuit 6 and second communicating circuit 7 respectively; The receiving terminal of described first communicating circuit 6 and transmitting terminal are electrically connected with the I/O interface of the central microprocessor of master controller respectively, the receiving terminal of described second communicating circuit 7 and transmitting terminal are electrically connected with the I/O interface of the central microprocessor of line control machine respectively, and the rule that described first communicating circuit 6 and second communicating circuit 7 set according to the software in master controller and the line control machine also realizes communication by link 1.Described+12V constant voltage dc source can obtain from the master controller of central air-conditioning, and making line control machine obtain this+the 12V constant voltage dc source by the line control machine that conductor wire is connected to central air-conditioning, described+5V constant voltage dc source can adopt integrated regulator 7850 to obtain from+12V constant voltage dc source.Concrete structure as shown in Figure 2, wherein, in first communicating circuit 6, first pull-up resistor is designated as R6, and first triode is designated as Q2, and first current-limiting resistance is designated as R5, first filter capacitor is designated as C3, second pull-up resistor is designated as R2, and second triode is designated as Q1, and second current-limiting resistance is designated as R1, second filter capacitor is designated as C1, the 3rd pull-up resistor is designated as R3, and pull down resistor is designated as R4, and the 3rd filter capacitor is designated as C2, integrated operational amplifier 5 is designated as IC1, receiving terminal is designated as RX1, and transmitting terminal is designated as TX1, and link 1 is designated as X1; In second communicating circuit 7, first pull-up resistor is designated as R16, and first triode is designated as Q12, first current-limiting resistance is designated as R15, and first filter capacitor is designated as C13, and second pull-up resistor is designated as R12, second triode is designated as Q11, and second current-limiting resistance is designated as R11, and second filter capacitor is designated as C11, the 3rd pull-up resistor is designated as R13, and pull down resistor is designated as R14, and the 3rd filter capacitor is designated as C12, integrated operational amplifier 5 is designated as IC11, receiving terminal is designated as RX2, and transmitting terminal is designated as TX2, and link 1 is designated as X2.
Concrete communication process is as follows:
When line control machine when master controller sends information, the transmitting terminal TX1 of first communicating circuit 6 keeps low level, the receiving terminal RX1 of first communicating circuit 6 is in receiving state signal, it (is that high level signal represents 1 in the digital circuit that line control machine sends high level signal to master controller, low level signal represents 0) time sequential as follows, described TX2 is 1, Q11 conducting so, making the positive input of IC1 by described X1 with being electrically connected of X2 is 0, the inverse output terminal of IC1 is 0 so, Q2 is ended, and RX1 is 1, and promptly the central microprocessor of master controller is received data signal 1; The sequential of line control machine when master controller sends low level signal is as follows, described TX2 is 0, Q11 ends so, making the positive input of IC1 by described X1 with being electrically connected of X2 is 1, the inverse output terminal of IC1 is 1 so, make the Q2 conducting, RX1 is 0, and promptly the central microprocessor of master controller is received digital signaling zero.
When master controller when line control machine sends information, the transmitting terminal TX2 of second communicating circuit 7 keeps low level, the receiving terminal RX2 of second communicating circuit 7 is in receiving state signal, and the sequential of master controller when line control machine sends high level signal is as follows, and described TX1 is 1, Q1 conducting so, making the positive input of IC11 by described X1 with being electrically connected of X2 is 0, and the inverse output terminal of IC11 is 0 so, and Q12 is ended, RX2 is 1, and promptly the central microprocessor of line control machine is received data signal 1; The sequential of master controller when line control machine sends low level signal is as follows, described TX1 is 0, Q1 ends so, making the positive input of IC11 by described X1 with being electrically connected of X2 is 1, the inverse output terminal of IC11 is 1 so, make the Q12 conducting, RX2 is 0, and promptly the central microprocessor of line control machine is received digital signaling zero.
When master controller and line control machine did not have communication, described TX1 kept low level, and TX2 keeps low level, and the connection that connects described X1 and X2 is a high level.
Claims (5)
1. the communicating circuit of a central air-conditioning, it comprises the link (1) of setting up communication between the communicating circuit and using, and it is characterized in that: it also comprises the first common emitter voltage amplifier circuit (2), the second common emitter voltage amplifier circuit (3), reference voltage input circuit (4) and integrated operational amplifier (5); The described first common emitter voltage amplifier circuit (2) is provided with receiving terminal, is used for being electrically connected with an I/O interface of central microprocessor; The described second common emitter voltage amplifier circuit (3) is provided with transmitting terminal, is used for being electrically connected with the another one I/O interface of central microprocessor; Be electrically connected with link (1) again after the positive input of described integrated operational amplifier (5) and second common emitter voltage amplifier circuit (3) parallel connection, the output of described integrated operational amplifier (5) is electrically connected with the first common emitter voltage amplifier circuit (2), and the reverse input end of described integrated operational amplifier (5) is electrically connected with reference voltage input circuit (4).
2. the communicating circuit of central air-conditioning according to claim 1, it is characterized in that: the described first common emitter voltage amplifier circuit (2) is made up of first triode, first current-limiting resistance, first filter capacitor of first pull-up resistor, NPN type; The colelctor electrode of described first triode is electrically connected with first pull-up resistor, and the base stage of described first triode is electrically connected with first current-limiting resistance, the grounded emitter of described first triode; One end of described first filter capacitor is electrically connected with the colelctor electrode of first triode, the other end ground connection of described first filter capacitor; Described receiving terminal is the colelctor electrode of first triode; The output of described integrated operational amplifier (5) is electrically connected the output that is meant described integrated operational amplifier (5) with the first common emitter voltage amplifier circuit (2) and is electrically connected with first current-limiting resistance.
3. the communicating circuit of central air-conditioning according to claim 1, it is characterized in that: the described second common emitter voltage amplifier circuit (3) is made up of second triode, second current-limiting resistance, second filter capacitor of second pull-up resistor, NPN type; The colelctor electrode of described second triode is electrically connected with second pull-up resistor, and the base stage of described second triode is electrically connected with an end of second current-limiting resistance, and described transmitting terminal is the other end of second current-limiting resistance, the grounded emitter of described second triode; One end of described second filter capacitor is electrically connected with the base stage of second triode, the other end ground connection of described second filter capacitor; Be electrically connected with link (1) again be electrically connected the colelctor electrode parallel connection of the positive input that is meant described integrated operational amplifier (5) and second triode after the positive input of described integrated operational amplifier (5) and second common emitter voltage amplifier circuit (3) parallel connection again with link (1) after.
4. the communicating circuit of central air-conditioning according to claim 1, it is characterized in that: described reference voltage input circuit (4) is made up of the 3rd pull-up resistor, pull down resistor, the 3rd filter capacitor; One end of described the 3rd pull-up resistor is electrically connected with an end of pull down resistor, an end of the 3rd filter capacitor, the reverse input end of integrated operational amplifier (5) respectively; The other end ground connection of described pull down resistor; The other end ground connection of described the 3rd filter capacitor.
5. the communicating circuit of central air-conditioning according to claim 3 is characterized in that: described integrated operational amplifier (5) employing LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100970276A CN101526258B (en) | 2009-03-26 | 2009-03-26 | Communication circuit of central air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100970276A CN101526258B (en) | 2009-03-26 | 2009-03-26 | Communication circuit of central air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN101526258A CN101526258A (en) | 2009-09-09 |
| CN101526258B true CN101526258B (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100970276A Active CN101526258B (en) | 2009-03-26 | 2009-03-26 | Communication circuit of central air conditioner |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865565B (en) * | 2010-06-13 | 2011-09-28 | 广东欧科空调制冷有限公司 | Hybrid air-cooled water chiller |
| FR3020906B1 (en) * | 2014-05-07 | 2018-11-02 | Ulis | HIGH DYNAMIC DEVICE FOR THE INTEGRATION OF AN ELECTRICAL CURRENT |
| WO2020019631A1 (en) * | 2018-07-27 | 2020-01-30 | 珠海格力电器股份有限公司 | Signal transmission circuit and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2430691Y (en) * | 2000-05-12 | 2001-05-16 | 刘志俊 | High voltage and super high voltage photoelectric isolated current mutual inductor |
| RU2346388C1 (en) * | 2008-02-01 | 2009-02-10 | Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный университет экономики и сервиса" (ГОУ ВПО "ЮРГУЭС") | Differential amplifier |
| CN201391968Y (en) * | 2009-03-26 | 2010-01-27 | 宁波海诚电器有限公司 | Communicating circuit of central air-conditioner |
-
2009
- 2009-03-26 CN CN2009100970276A patent/CN101526258B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2430691Y (en) * | 2000-05-12 | 2001-05-16 | 刘志俊 | High voltage and super high voltage photoelectric isolated current mutual inductor |
| RU2346388C1 (en) * | 2008-02-01 | 2009-02-10 | Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный университет экономики и сервиса" (ГОУ ВПО "ЮРГУЭС") | Differential amplifier |
| CN201391968Y (en) * | 2009-03-26 | 2010-01-27 | 宁波海诚电器有限公司 | Communicating circuit of central air-conditioner |
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| CN101526258A (en) | 2009-09-09 |
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Effective date of registration: 20180126 Address after: 315191 Yinzhou District Province, Ningbo City, Jiang Shan town on the village of summer ho Patentee after: AUX air conditioning Limited by Share Ltd Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo Haicheng Electric al Appliances Co., Ltd. |
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