CN103162372A - Air conditioner, RS485 bus system of air conditioner and bus system control method - Google Patents
Air conditioner, RS485 bus system of air conditioner and bus system control method Download PDFInfo
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- CN103162372A CN103162372A CN2011104107625A CN201110410762A CN103162372A CN 103162372 A CN103162372 A CN 103162372A CN 2011104107625 A CN2011104107625 A CN 2011104107625A CN 201110410762 A CN201110410762 A CN 201110410762A CN 103162372 A CN103162372 A CN 103162372A
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 230000005611 electricity Effects 0.000 claims description 16
- 238000004378 air conditioning Methods 0.000 claims description 15
- 238000009434 installation Methods 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention provides an RS485 bus system, which comprises a power supply side circuit and a power supply side circuit which are connected, wherein the power supply side circuit comprises two core needle seats CN2 connected with a wire controller cable, one end of each of the two core needle seats CN2 is connected with a ground interface, the other end of each of the two core needle seats CN2 is communicated with a power interface, the power supply side circuit also comprises a control end connected with the IO of an MCU, the power supply side circuit comprises two core needle seats CN1 connected with a mainboard cable, two pins of the two core needle seats CN1 are connected to a rectifier bridge in a crossing manner, an energy storage capacitor and a power supply chip are connected after passing through the rectifier bridge, and the two core needle seats CN1 and CN2 of the power supply side circuit and the power supply side circuit are also. The invention also provides a bus system control method, which uses the RS485 bus system: and controlling the MCU to input a level value so as to control whether the power-taking party circuit is communicated or not and to control the energy-storing capacitor to take or discharge power. The invention adopts two core wires to complete the functions of power supply and communication aiming at small-sized terminal equipment with lower power consumption, reduces half of the cable cost, and greatly reduces the engineering installation difficulty and the failure 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 the RS485 bus, are widely used in the fields such as Industry Control, air-conditioning.At low-power consumption Miniature Terminal equipment such as the line control machine of air-conditioning, described line control machine and interior owner's plate carry out communication, and line control machine needs by main board power supply, so just need four lines to connect mainboard and line control machine, wherein two is power line, and namely mainboard is powered to line control machine, and other two is connection.The prior art four existing problems of wire connection structure are: need two independent power lines, the cable consumptive material is more, has increased cost; During wiring, four lines need to the 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 supplier of electricity circuit and the power taking side's circuit that is connected, this supplier of electricity circuit comprises the two core needle stand CN2 that connect the line control machine cable, this two cores needle stand CN2 one end connects the 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 the 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 the connecting communication circuit.
RS485 bus system of the present invention adopts time-sharing multiplexing technology, only needs two lines to connect, and can realize simultaneously power supply and the communication of line control machine.Concrete control logic is that the rear mainboard that powers on loads the DC voltage of 24V on the connection, storage capacitor on line control machine begins charging at this moment, storage capacitor charging after certain hour on line control machine reaches rated voltage and can begin normal operation, then mainboard disconnects power supply by control circuit, do not have supply voltage on connection this moment, can carry out normal RS485 communication, the corona discharge work that line control machine dependence self storage capacitor stores, charge again after the communication of a circulation, successively circulation.
Fix through the two ends polarity that outputs to storage capacitor after rectifier bridge, therefore can solve the electric power polarity problem, the connection of two lines does not have polar requirement, arbitrarily wiring, and need not to need to distinguish in detail as the prior art quad, installation difficulty is increased, and have the wrong line to cause the danger of communication failure.So technical scheme of the present invention greatly reduces the project installation difficulty, wiring is simple, and failure rate is low.
This storage capacitor can be adjusted capacity according to actual needs, or adopts a plurality of 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;
When controlling the 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;
When controlling the MCU input low level, control power interface and 24V power supply and disconnect, control ground interface and disconnect with ground, described storage capacitor discharge, power taking side's circuit carries out communication.
The 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, Miniature Terminal equipment for lower power consumption adopts two heart yearns to complete the function that power supply and communication are provided, and need not distinguish A, B line as traditional RS485, reduce the cable cost of half; And two lines do not have polarity, can arbitrarily connect, and unlike original quad, need to distinguish in detail, and 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.
[description of 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 structural representation that to be air-conditioning mainboard of the present invention be connected by two heart yearns with line control machine.
[specific embodiment]
See also Fig. 1 ~ 2, RS485 bus system of the present invention comprises supplier of electricity circuit and the power taking side's circuit that is connected.
As shown in Figure 1, this supplier of electricity circuit comprises the two core needle stand CN2 that connect the line control machine cable, and its control end control end connects the IO of MCU, when MCU output high level, power interface Vin and 24V power connection, and with the 1 pin conducting of two core needle stand CN2, the power supply of 24V is arranged on bus this moment; The 2 pin conductings of ground interface and two core needle stand CN2, and be connected with ground; Be power-on time this moment, and power taking can be passed through the bus power taking, can not carry out communication; When the MCU output low level, Vin, GND disconnect with 24V power supply and GND respectively, and do not have extra power supply on bus this moment, 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 the 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, connect storage capacitor and power supply chip after rectifier bridge, what this moment, no matter 1 pin of CN1 connected is 1 pin or 2 pin of CN2, namely 1 or 2 of input is any ends in power supply or ground, fix through the two ends polarity that outputs to storage capacitor C1 after rectifier bridge, therefore can solve the 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 the 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 a plurality of 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 approximately 22V, and LM2574N is the DC-DC power supply chip, will input at the 8-22V DC voltage by this chip and peripheral circuit and be converted to stable 5V DC voltage, offers the device work such as MCU on line control machine, communication chip.
RS485 bus system of the present invention adopts time-sharing multiplexing technology, only needs two lines to connect, and can realize simultaneously power supply and the communication of line control machine.Concrete control logic is that the rear mainboard that powers on loads the DC voltage of 24V on the connection, storage capacitor on line control machine begins charging at this moment, storage capacitor charging after certain hour on line control machine reaches rated voltage and can begin normal operation, then mainboard disconnects power supply by control circuit, do not have supply voltage on connection this moment, can carry out normal RS485 communication, the corona discharge work that line control machine dependence self storage capacitor stores, charge again after the communication of a circulation, successively circulation.
See also Fig. 3, adopt the air-conditioning of RS485 bus system of the present invention, this air-conditioning comprises mainboard and a plurality of 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 a plurality of.
Connect by two heart yearns between mainboard and line control machine, 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 line control machine by the RS485 communication 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 with the parameter of user's input by communication transfer to mainboard.
The above is only preferred embodiment of the present invention, and protection scope of the present invention is not limited to this, any all belong to protection domain of the present invention based on the equivalent transformation on technical solution of the present invention within.
Claims (6)
1. RS485 bus system, it is characterized in that, it comprises supplier of electricity circuit and the power taking side's circuit that is connected, this supplier of electricity circuit comprises the two core needle stand CN2 that connect the line control machine cable, this two cores needle stand CN2 one end connects the 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 the mainboard cable, the bipod commissure of this two cores needle stand CN1 is received rectifier bridge, connect storage capacitor and power supply chip after rectifier bridge, two core needle stand CN1 of this supplier of electricity circuit and power taking side's circuit and CN2 also distinguish the connecting communication circuit.
2. RS485 bus system as claimed in claim 1, is characterized in that, this storage capacitor adopts a plurality of Capacitance parallel connections.
3. RS485 bus system as claimed in claim 1, is characterized in that, this power supply chip is the DC-DC power supply chip of 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. air-conditioning, this air-conditioning comprises mainboard and line control machine, it is characterized in that, it adopts 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 RS485 bus system as described in claim 1 to 4 any one, comprising:
Control MCU incoming level value;
When controlling the 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;
When controlling the MCU input low level, control power interface and 24V power supply and disconnect, control ground interface and disconnect with ground, described storage capacitor discharge, power taking side's circuit carries out communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110410762.5A CN103162372B (en) | 2011-12-12 | 2011-12-12 | Air conditioner, RS485 bus system of air conditioner and bus system control method |
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| CN201110410762.5A CN103162372B (en) | 2011-12-12 | 2011-12-12 | Air conditioner, RS485 bus system of air conditioner and bus system control method |
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| CN103162372A true CN103162372A (en) | 2013-06-19 |
| CN103162372B CN103162372B (en) | 2016-05-04 |
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Cited By (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 |
| CN105352111A (en) * | 2015-10-10 | 2016-02-24 | 珠海格力电器股份有限公司 | Control method and device and air conditioner mainboard |
| CN107143964A (en) * | 2016-03-01 | 2017-09-08 | 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 | Air conditioning system and communication method between units in air conditioning system |
| CN109028508A (en) * | 2018-06-01 | 2018-12-18 | 青岛海尔空调电子有限公司 | Air-conditioning line control machine power supply communication circuit |
| CN109888766A (en) * | 2019-04-10 | 2019-06-14 | 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 |
| CN110048484A (en) * | 2019-04-30 | 2019-07-23 | 珠海格力电器股份有限公司 | Communication control circuit, control method and device thereof and air conditioner |
| WO2019196484A1 (en) * | 2018-04-13 | 2019-10-17 | 珠海格力电器股份有限公司 | Air-conditioning system and method for communication between units in air-conditioning system |
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2011
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Cited By (11)
| 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 |
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| CN107143964A (en) * | 2016-03-01 | 2017-09-08 | 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 | Air conditioning system and communication method between units in air conditioning system |
| WO2019196483A1 (en) * | 2018-04-13 | 2019-10-17 | 珠海格力电器股份有限公司 | Air conditioning system and communication method between units in air conditioning system |
| WO2019196484A1 (en) * | 2018-04-13 | 2019-10-17 | 珠海格力电器股份有限公司 | Air-conditioning system and method for communication between units in air-conditioning system |
| CN109028508A (en) * | 2018-06-01 | 2018-12-18 | 青岛海尔空调电子有限公司 | Air-conditioning line control machine power supply communication circuit |
| 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 |
| CN109888766A (en) * | 2019-04-10 | 2019-06-14 | 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 |
| CN110048484A (en) * | 2019-04-30 | 2019-07-23 | 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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| CN103162372B (en) | 2016-05-04 |
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