CN103162372B - Air-conditioner and RS485 bus system thereof and bus system control method - Google Patents
Air-conditioner and RS485 bus system thereof and bus system control method Download PDFInfo
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- CN103162372B CN103162372B CN201110410762.5A CN201110410762A CN103162372B CN 103162372 B CN103162372 B CN 103162372B CN 201110410762 A CN201110410762 A CN 201110410762A CN 103162372 B CN103162372 B CN 103162372B
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Abstract
The invention provides a kind of RS485 bus system, it comprises the supplier of electricity circuit and the power taking side's circuit that are connected, this supplier of electricity circuit comprises the two core needle stand CN2 that connect line control machine cable, this two core needle stand CN2 one end connects ground interface, one end and power interface are connected, this supplier of electricity circuit also comprises the control end of the IO that connects MCU, this power taking side's circuit comprises the two core needle stand CN1 that connect mainboard cable, the bipod commissure of this two cores needle stand CN1 is received rectifier bridge, after rectifier bridge, connect storage capacitor and power supply chip, two core needle stand CN1 of this supplier of electricity circuit and power taking side's circuit and CN2 also distinguish connecting communication circuit. the present invention also provides a kind of bus system control method, and the method has been used described RS485 bus system: control MCU incoming level value, and then whether control the circuit communication of power taking side, and storage capacitor carries out power taking or electric discharge. the Miniature Terminal equipment that the present invention is directed to lower power consumption adopts two heart yearns to complete the function that power supply and communication are provided, and reduces the cable cost of half, and greatly reduces project installation difficulty and fault rate.
Description
[technical field]
The present invention relates to industrial control field, particularly about a kind of RS485 bus system of field of air conditioning.
[background technology]
Long transmission distance, antijamming capability are strong, low cost and other advantages owing to having for RS485 bus, are widely used in the field such as Industry Control, air-conditioning. At the low-power consumption Miniature Terminal equipment of air-conditioning, as line control machine, described line control machine and interior owner's plate carry out communication, and line control machine need be by main board power supply, so just need four lines to connect mainboard and line control machine, wherein two is power line, and mainboard is powered to line control machine, and other two is connection. The existing problem of prior art four wire connection structure is: need two independent power lines, cable consumptive material is more, has increased cost; When wiring, four lines need to identification order, increases the difficulty of engineering wiring and increases the probability of makeing mistakes.
Therefore, provide that cost is low, wiring is simple, install easily, the RS485 bus system of failure rate is low.
[summary of the invention]
The object of the present invention is to provide a kind of RS485 bus system easy, failure rate is low that connects up simply, installs.
Another object of the present invention is to provide that a kind of cost is low, wiring is simple, install easily, the air-conditioning of failure rate is low. This air-conditioning adopts described RS485 bus system.
A further object of the present invention is to provide a kind of bus system control method simple, failure rate is low that connects up.
For realizing the object of the invention, provide following technical scheme:
The invention provides a kind of RS485 bus system, it comprises the supplier of electricity circuit and the power taking side's circuit that are connected, this supplier of electricity circuit comprises the two core needle stand CN2 that connect line control machine cable, this two core needle stand CN2 one end connects ground interface, one end and power interface are connected, and this supplier of electricity circuit also comprises the control end of the IO that connects MCU; This power taking side's circuit comprises, connect two core needle stand CN1 of mainboard cable, the bipod commissure of this two cores needle stand CN1 is received rectifier bridge, connects storage capacitor and power supply chip after rectifier bridge, and two core needle stand CN1 of this supplier of electricity circuit and power taking side's circuit and CN2 also distinguish connecting communication circuit.
RS485 bus system of the present invention adopts time-sharing multiplexing technology, only needs two lines to connect, and can realize power supply and the communication of line control machine simultaneously. Concrete control logic be after powering on mainboard to the DC voltage that loads 24V on connection, storage capacitor on line control machine now starts charging, storage capacitor charging after certain hour on line control machine reaches rated voltage and can start normal work, then mainboard disconnects power supply by control circuit, now on connection, there is no supply voltage, can carry out normal RS485 communication, the corona discharge work that line control machine dependence self storage capacitor stores, after the communication of a circulation, charge again, successively circulation.
The two ends polarity that outputs to storage capacitor after rectifier bridge is fixed, therefore can solve electric power polarity problem, the connection of two lines does not have polar requirement, arbitrarily wiring, and distinguish in detail without needing as prior art quad, installation difficulty is increased, and have wrong line to cause the danger of communication failure. So technical scheme of the present invention greatly reduces project installation difficulty, wiring is simple, and failure rate is low.
This storage capacitor can be adjusted capacity according to actual needs, or adopts multiple Capacitance parallel connections to increase capacity.
This power supply chip is preferably the DC-DC power supply chip of LM2574N.
The communication chip of this communicating circuit preferably adopts non-polar 485 chip.
The present invention also provides a kind of air-conditioning that adopts described RS485 bus system, this air-conditioning comprises mainboard and line control machine, this mainboard cable connects two core needle stand CN1 of power taking side's circuit of RS485 bus system, and this line control machine connects two core needle stand CN2 of the supplier of electricity circuit of RS485 bus system.
The present invention also provides a kind of bus system control method, and the method has been used RS485 bus system as above, comprises the steps:
Control MCU incoming level value;
In the time controlling MCU input high level, control power interface and 24V power connection, to control ground interface and be connected with ground, power taking side's circuit stops communication, and described storage capacitor carries out power taking;
In the time controlling MCU input low level, control power interface and 24V power supply and disconnect, control ground interface and disconnect with ground, described storage capacitor electric discharge, power taking side's circuit carries out communication.
Contrast prior art, the present invention has the following advantages:
The present invention is directed to the drawback that prior art exists, a kind of nonpolarity RS485 bus system and this bus system control method that includes supplier of electricity circuit and power taking side's circuit proposed, adopt two heart yearns to complete the function that power supply and communication are provided for the Miniature Terminal equipment of lower power consumption, and do not need to distinguish A, B line as traditional RS485, reduce the cable cost of half; And two lines do not have polarity, can arbitrarily connect, unlike original quad, need to distinguish in detail, wrong will cause communication failure, and the present invention greatly reduces project installation difficulty and fault rate. Adopt the air-conditioning cost of described RS485 bus system low, connect up simply, install easy, failure rate is low.
[brief description of the drawings]
Fig. 1 is RS485 bus system supplier of electricity circuit diagram of the present invention;
Fig. 2 is RS485 bus system of the present invention power taking side circuit diagram;
Fig. 3 is the structural representation that air-conditioning mainboard of the present invention is connected by two heart yearns with line control machine.
[detailed description of the invention]
Refer to Fig. 1 ~ 2, RS485 bus system of the present invention comprises the supplier of electricity circuit and the power taking side's circuit that are connected.
As shown in Figure 1, this supplier of electricity circuit comprises the two core needle stand CN2 that connect line control machine cable, and its control end control end connects the IO of MCU, in the time of MCU output high level, power interface Vin and 24V power connection, and with the 1 pin conducting of two core needle stand CN2, now in bus, have the power supply of 24V; The 2 pin conductings of ground interface and two core needle stand CN2, and be connected with ground; Be now power-on time, power taking can be passed through bus power taking, can not carry out communication; In the time of MCU output low level, Vin, GND disconnect with 24V power supply and GND respectively, now in bus, there is no extra power supply, can carry out normal communication.
As shown in Figure 2, this power taking side's circuit comprises the two core needle stand CN1 that connect mainboard cable, bipod (1 pin, the 2 pin) commissure of this two cores needle stand CN1 is received rectifier bridge and is carried out rectification and isolation, after rectifier bridge, connect storage capacitor and power supply chip, what now no matter 1 pin of CN1 connected is 1 pin or 2 pin of CN2,1 or 2 of input is any one end in power supply or ground, the two ends polarity that outputs to storage capacitor C1 after rectifier bridge is fixed, therefore can solve electric power polarity problem, the connection of two lines does not have polar requirement.
Two core needle stand CN1 of this supplier of electricity circuit and power taking side's circuit and CN2 also distinguish connecting communication circuit, and the communication chip of this communicating circuit adopts non-polar 485 chip.
C1 is storage capacitor (can adjust according to actual needs capacity or adopt multiple Capacitance parallel connections to increase capacity), and communication device relies on the electric weight on storage capacitor to carry to line control machine and powers. Voltage on storage capacitor can be charged to about 22V, and LM2574N is DC-DC power supply chip, by this chip and peripheral circuit, input is converted to stable 5V DC voltage at 8-22V DC voltage, offers the device such as MCU, the communication chip work on line control machine.
RS485 bus system of the present invention adopts time-sharing multiplexing technology, only needs two lines to connect, and can realize power supply and the communication of line control machine simultaneously. Concrete control logic be after powering on mainboard to the DC voltage that loads 24V on connection, storage capacitor on line control machine now starts charging, storage capacitor charging after certain hour on line control machine reaches rated voltage and can start normal work, then mainboard disconnects power supply by control circuit, now on connection, there is no supply voltage, can carry out normal RS485 communication, the corona discharge work that line control machine dependence self storage capacitor stores, after the communication of a circulation, charge again, successively circulation.
Refer to Fig. 3, adopt the air-conditioning of RS485 bus system of the present invention, this air-conditioning comprises mainboard and multiple line control machine, and this mainboard cable connects two core needle stand CN1 of power taking side's circuit of RS485 bus system, and this line control machine connects two core needle stand CN2 of the supplier of electricity circuit of RS485 bus system. The quantity of this line control machine can be 1 according to requirement of engineering and arrive multiple.
Between mainboard and line control machine, connect by two heart yearns, mainboard can be powered to line control machine, also can carry out communication with line control machine. Mainboard is the main control unit of unit, is responsible for controlling operation and the fault detect of air-conditioning, the parameters such as set state, temperature, fault message is issued to line control machine by RS485 communication and show; Line control machine is man-machine interface, its major function is to provide user's input, as switching on and shutting down, Temperature Setting, wind speed set, regularly, the setting such as sleep, receive the communication data of mainboard and show running status and the fault message of air-conditioning, simultaneously by the parameter of user's input by communication transfer to mainboard.
The foregoing is only preferred embodiment of the present invention, protection scope of the present invention is not limited to this, within any equivalent transformation based in technical solution of the present invention all belongs to protection domain of the present invention.
Claims (6)
1. a RS485 bus system, it is characterized in that, it comprises the supplier of electricity circuit and the power taking side's circuit that are connected, this supplier of electricity circuit comprises the two core needle stand CN2 that connect line control machine cable, this two core needle stand CN2 one end connects ground interface, one end and power interface are connected, and this supplier of electricity circuit also comprises the control end of the IO that connects MCU; This power taking side's circuit comprises the two core needle stand CN1 that connect mainboard cable, the bipod commissure of this two cores needle stand CN1 is received rectifier bridge, after rectifier bridge, connect storage capacitor and power supply chip, two core needle stand CN1 of this supplier of electricity circuit and power taking side's circuit and CN2 also distinguish connecting communication circuit.
2. RS485 bus system as claimed in claim 1, is characterized in that, this storage capacitor adopts multiple Capacitance parallel connections.
3. RS485 bus system as claimed in claim 1, is characterized in that, the DC-DC power supply chip that this power supply chip is LM2574N.
4. RS485 bus system as claimed in claim 1, is characterized in that, the communication chip of this communicating circuit adopts non-polar 485 chip.
5. an air-conditioning, this air-conditioning comprises mainboard and line control machine, it is characterized in that, it adopts the RS485 bus system as described in claim 1 ~ 4 any one, this mainboard cable connects two core needle stand CN1 of power taking side's circuit of RS485 bus system, and this line control machine connects two core needle stand CN2 of the supplier of electricity circuit of RS485 bus system.
6. a bus system control method, is characterized in that having used the RS485 bus system as described in claim 1 to 4 any one, comprising:
Control MCU incoming level value;
In the time controlling MCU input high level, control power interface and 24V power connection, to control ground interface and be connected with ground, power taking side's circuit stops communication, and described storage capacitor carries out power taking;
In the time controlling MCU input low level, control power interface and 24V power supply and disconnect, control ground interface and disconnect with ground, described storage capacitor electric discharge, power taking side's circuit carries out communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110410762.5A CN103162372B (en) | 2011-12-12 | 2011-12-12 | Air-conditioner and RS485 bus system thereof and bus system control method |
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| CN201110410762.5A CN103162372B (en) | 2011-12-12 | 2011-12-12 | Air-conditioner and RS485 bus system thereof and bus system control method |
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| CN103162372A CN103162372A (en) | 2013-06-19 |
| CN103162372B true CN103162372B (en) | 2016-05-04 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954122A (en) * | 2014-04-22 | 2014-07-30 | 佛山市佰特科技有限公司 | Heat pump drying and dehumidifying all-in-one machine intelligent controller |
| CN105352111B (en) * | 2015-10-10 | 2018-09-07 | 珠海格力电器股份有限公司 | Control method, device and air-conditioning mainboard |
| CN107143964B (en) * | 2016-03-01 | 2021-01-12 | 珠海格力电器股份有限公司 | Starting circuit for starting air conditioner and air conditioner |
| CN108800446A (en) * | 2018-04-13 | 2018-11-13 | 珠海格力电器股份有限公司 | Communication means in air-conditioning system and air-conditioning system between unit |
| CN108592310A (en) * | 2018-04-13 | 2018-09-28 | 珠海格力电器股份有限公司 | Communication means in air-conditioning system and air-conditioning system between unit |
| CN109028508B (en) * | 2018-06-01 | 2021-03-23 | 青岛海尔空调电子有限公司 | Power supply communication circuit of air conditioner wire controller |
| CN109888766B (en) * | 2019-04-10 | 2020-09-15 | 珠海格力电器股份有限公司 | Bus electricity taking equipment, electricity utilization control method, device and system thereof, and electrical equipment |
| CN110048484B (en) * | 2019-04-30 | 2020-10-02 | 珠海格力电器股份有限公司 | Communication control circuit, control method and device thereof and air conditioner |
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| JP3104625B2 (en) * | 1996-09-30 | 2000-10-30 | ダイキン工業株式会社 | Power calculation device and power calculation method for air conditioner |
| CN1704944A (en) * | 2004-05-26 | 2005-12-07 | 上海时运高新技术股份有限公司 | Electronic label aided management system for paperless warehousing and storage activities and operation method thereof |
| CN201199695Y (en) * | 2008-05-05 | 2009-02-25 | 吴明星 | Auxiliary power supply circuit for self-power bus passive intelligent data terminal |
| CN201207647Y (en) * | 2008-05-27 | 2009-03-11 | 青岛海科森科技有限公司 | Two-wire system non-polarity master-slave type communication transceiver |
| CN201215974Y (en) * | 2008-06-04 | 2009-04-01 | 海尔集团公司 | Communication interface without polarity |
| CN202547004U (en) * | 2011-12-12 | 2012-11-21 | 珠海格力电器股份有限公司 | Air conditioner and recommended standard (RS) 485 bus system thereof |
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2011
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3104625B2 (en) * | 1996-09-30 | 2000-10-30 | ダイキン工業株式会社 | Power calculation device and power calculation method for air conditioner |
| CN1704944A (en) * | 2004-05-26 | 2005-12-07 | 上海时运高新技术股份有限公司 | Electronic label aided management system for paperless warehousing and storage activities and operation method thereof |
| CN201199695Y (en) * | 2008-05-05 | 2009-02-25 | 吴明星 | Auxiliary power supply circuit for self-power bus passive intelligent data terminal |
| CN201207647Y (en) * | 2008-05-27 | 2009-03-11 | 青岛海科森科技有限公司 | Two-wire system non-polarity master-slave type communication transceiver |
| CN201215974Y (en) * | 2008-06-04 | 2009-04-01 | 海尔集团公司 | Communication interface without polarity |
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| CN103162372A (en) | 2013-06-19 |
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