Air conditioner communication device, slave equipment and multi-split system

Abstract

The embodiment of the utility model discloses an air conditioner communication device, slave equipment and a multi-split system, the air conditioner communication device is applied to the slave equipment, the air conditioner communication device comprises a communication bus, a controller, a first receiving circuit, a second receiving circuit and a reply circuit, the first receiving circuit is connected with the communication bus and the controller, and the second receiving circuit is connected with the reply circuit. The first receiving circuit receives signals sent by host equipment from the communication bus and sends the signals to the controller, the second receiving circuit is connected with the communication bus and the controller, the second receiving circuit receives signals sent by other slave equipment from the communication bus and sends the signals to the controller, and the return circuit is connected with the communication bus and the controller. The reply circuit replies a signal to at least one of the host device and the other slave devices under the control of the controller. According to the air conditioner communication device provided by the embodiment of the invention, communication between the host equipment and the slave equipment is realized, and communication between the slave equipment is compatible, so that the use performance of a communication bus is improved.

Description

Technical Field

[0001] This application relates to the technical field of bus communication, and more particularly, to an air conditioner communication device, a slave device, and a multi-connected air conditioner system. Background Art

[0002] In related technologies, communication buses mainly include RS485 bus, CAN bus, home bus, PLC bus, etc. Among them, RS485 bus and CAN bus can only communicate and cannot supply power. That is, RS485 bus and CAN bus need to set two lines for power supply and two lines for communication, resulting in a high installation cost. Moreover, RS485 bus and CAN bus adopt a bus topology, which increases the difficulty of installing and wiring the communication bus.

[0003] The home bus and PLC bus can achieve both communication and power supply. However, the home bus needs to use a high-power inductor and the communication distance is only a few hundred meters. The PLC bus has a high cost and occupies a large volume, making it difficult to meet the engineering installation requirements of central air conditioners. Summary of the Utility Model

[0004] An embodiment of this application provides an air conditioner communication device, aiming to solve one of the technical problems existing in related technologies.

[0005] In a first aspect of an embodiment of this application, an air conditioner communication device is provided. The air conditioner communication device is applied to a slave device. The air conditioner communication device includes a communication bus, a controller, a first receiving circuit, a second receiving circuit, and a reply circuit. The first receiving circuit is connected to both the communication bus and the controller. The first receiving circuit is configured to receive a signal sent by a host device from the communication bus and send it to the controller. The second receiving circuit is connected to both the communication bus and the controller. The second receiving circuit is configured to receive a signal sent by other slave devices from the communication bus and send it to the controller. The reply circuit is connected to both the communication bus and the controller. The reply circuit is configured to reply a signal to the host device and / or the other slave devices under the control of the controller.

[0006] Further, the second receiving circuit includes a voltage dividing circuit and an overvoltage protection circuit. The voltage dividing circuit is connected to the communication bus. The overvoltage protection circuit is connected to both the voltage dividing circuit and the controller.

[0007] Further, the voltage dividing circuit includes a first resistor, a magnetic ring, and a second resistor. The first end of the first resistor is connected to the communication bus, the second end of the first resistor is connected to the first end of the magnetic ring, the first end of the magnetic ring is connected to the first end of the second resistor, and the second end of the second resistor is grounded. The overvoltage protection circuit includes a first switching tube and a third resistor. The control end of the first switching tube is connected to the second end of the first resistor. The input end of the first switching tube is connected to an external power supply, the output end of the first switching tube is grounded through the third resistor, and the output end of the first switching tube is connected to the controller.

[0008] Further, the voltage dividing circuit further includes a second switching tube. The control end of the second switching tube is connected to the control end of the first switching tube and is connected to the communication bus through the first resistor. The input end of the second switching tube is connected to the communication bus through the magnetic ring and the first resistor, and the output end of the second switching tube is grounded through the second resistor.

[0009] Further, the voltage dividing circuit further includes a filter capacitor. One end of the filter capacitor is connected to the control end of the first switching tube, and the other end of the filter capacitor is grounded.

[0010] Further, the feedback circuit includes a third switching tube, a fourth switching tube, a fourth resistor, a fifth resistor, and a sixth resistor. The control end of the third switching tube is connected to the control end of the fourth switching tube and is connected to the controller through the fourth resistor. The input end of the third switching tube is connected to the controller through the fourth resistor. The output end of the third switching tube is grounded through the fifth resistor. The input end of the fourth switching tube is connected to the communication bus, and the output end of the fourth switching tube is grounded through the sixth resistor.

[0011] Further, the first receiving circuit includes a seventh resistor and an eighth resistor. The first end of the seventh resistor is connected to the communication bus. The second end of the seventh resistor is connected to the first end of the eighth resistor and is connected to the controller, and the second end of the eighth resistor is grounded.

[0012] Further, the air conditioner communication device further includes a rectifying circuit. The rectifying resistor is connected to the communication bus, the first receiving circuit, the second receiving circuit, and the feedback circuit, and is connected to an external power supply to supply power to the slave device.

[0013] Further, the communication bus includes a first communication bus and a second communication bus. The rectification circuit includes a rectifier bridge, a first diode, and a second diode. The rectifier bridge is connected to the first communication bus and the second communication bus, and the rectifier bridge is used to access the external power supply. The anode of the first diode is connected to the rectifier bridge and the first communication bus, and the cathode of the first diode is connected to the first receiving circuit, the second receiving circuit, and the reply circuit. The anode of the second diode is connected to the rectifier bridge and the second communication bus, and the cathode of the second diode is connected to the first receiving circuit, the second receiving circuit, and the reply circuit.

[0014] Further, the air conditioner communication device further includes an anti-interference circuit, and the anti-interference circuit is disposed on and connected to the communication bus.

[0015] In a second aspect of the embodiments of the present application, a slave device is provided. The slave device includes the air conditioner communication device according to any one of the above and a housing, and the air conditioner communication device is disposed in the housing.

[0016] In a third aspect of the embodiments of the present application, a multi-connected air conditioner system is provided. The multi-connected air conditioner system includes a master device and a plurality of slave devices as described above. Between different slave devices and between the slave device and the master device, communication connections are established through the communication bus.

[0017] In the embodiments of the present application, by providing a first receiving circuit, when the master device is in a sending state, the first receiving circuit in the slave device receives the signal sent by the master device from the communication bus. After being processed by the first receiving circuit, the signal sent by the master device is sent to the controller to implement the communication function between the master device and the slave device. Based on this, by providing a second receiving circuit, when other slave devices are in a sending state, the second receiving circuit in the slave device can receive the signals sent by other slave devices. The second receiving circuit sends the received signals sent by other slave devices to the controller after processing to implement the communication function between the slave devices. At the same time, the air conditioner communication device is further provided with a reply circuit, and the controller controls the reply circuit to reply signals to at least one of the master device and other slave devices according to the state of the communication bus, so as to implement the communication between the master device and the slave device through the communication bus and be compatible with the communication between the slave devices, thereby increasing the performance of the communication bus. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a block diagram of the module structure of a multi-connected unit system in an embodiment of the present application;

[0020] Figure 2 It is a communication schematic diagram of a multi-connected unit system in an embodiment of the present application;

[0021] Figure 3 It is a circuit schematic diagram of an air conditioner communication device in an embodiment of the present application;

[0022] Figure 4 It is a circuit structure schematic diagram of a second receiving circuit in an embodiment of the present application;

[0023] Figure 5 It is a circuit structure schematic diagram of a second receiving circuit in another embodiment of the present application;

[0024] Figure 6 It is a circuit structure schematic diagram of a reply circuit in an embodiment of the present application;

[0025] Figure 7 It is a circuit structure schematic diagram of a first receiving circuit in an embodiment of the present application.

[0026] Explanation of the reference numerals in the drawings: 100 - air conditioner communication device; 10 - communication bus; P1 - first communication bus; P2 - second communication bus; 20 - controller; 30 - first receiving circuit; R7 - seventh resistor; R8 - eighth resistor; 40 - second receiving circuit; 41 - voltage dividing circuit; R1 - first resistor; R2 - second resistor; Q2 - second switching tube; C1 - filter capacitor; 42 - overvoltage protection circuit; Q1 - first switching tube; R3 - third resistor; L1 - magnetic ring; 50 - reply circuit; Q3 - third switching tube; Q4 - fourth switching tube; R4 - fourth resistor; R5 - fifth resistor; R6 - sixth resistor; 60 - rectifying circuit; 61 - rectifier bridge; D1 - first diode; D2 - second diode; 70 - anti-interference circuit; 200 - slave device; 300 - master device; 400 - multi-connected unit system. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of this application more clear and understandable, the following further elaborates on this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain this application and are not used to limit this application.

[0028] Please refer to Figure 1 - Figure 2 , an embodiment of this application provides a multi-connected unit system 400. The multi-connected unit system 400 can be applicable to a central air-conditioning system. The multi-connected unit system 400 can include a host device 300 and multiple slave devices 200. Between different slave devices 200, and between the slave device 200 and the host device 300, they can be communicatively connected through a communication bus 10. That is, in the actual application process, the host device 300 performs data communication with multiple slave devices 200 through the communication bus 10, so that the host device 300 can control multiple slave devices 200 to perform corresponding functions through the communication bus 10. For example, the host device 300 can control some of the slave devices 200 to perform a refrigeration function, and another part of the slave devices 200 to perform a heating function, etc.

[0029] Furthermore, the slave device 200 can include an air-conditioning communication device 100 and a housing (not shown in the figure). Among them, the air-conditioning communication device 100 can be disposed within the housing, so that the housing plays a role in protecting the air-conditioning communication device 100, thereby avoiding damage to the components on the air-conditioning communication device 100.

[0030] The following details the air-conditioning communication device 100.

[0031] Please refer to Figure 2 , the air-conditioning communication device 100 of an embodiment of this application is applied to the slave device 200. It can be understood that the multi-connected unit system 400 can include a host device 300 and multiple slave devices 200. The host device 300 and the multiple slave devices 200 are connected through the communication bus 10, and data communication between the host device 300 and the multiple slave devices 200 is realized through the communication bus 10, thereby facilitating the host device 300 to control the multiple slave devices 200 to perform corresponding functions.

[0032] Please refer to Figure 3 , the air-conditioning communication device 100 includes a communication bus 10, a controller 20, a first receiving circuit 30, a second receiving circuit 40, and a reply circuit 50. Among them, the controller 20 can be a micro control unit (MCU), or other control devices, and this application embodiment does not make specific limitations on this.

[0033] Please continue to refer to Figure 3, the first receiving circuit 30 is connected to both the communication bus 10 and the controller 20, and the first receiving circuit 30 is used to receive the signal sent by the host device 300 from the communication bus 10 and send it to the controller 20. It can be understood that the host device 300 is connected to multiple slave devices 200 through the communication bus 10, so that data communication is realized between the host device 300 and the multiple slave devices 200 through the communication bus 10. When the host device 300 is in the sending state, the signal sent by the host device 300 is output to the first receiving circuit 30 through the communication bus 10 for reception. Then, the first receiving circuit 30 modulates the signal received from the host device 300, and the first receiving circuit 30 transmits the processed signal to the controller 20, so as to facilitate the controller 20 to obtain the signal information sent by the host device 300, and further facilitate the controller 20 to control the slave device 200 to execute corresponding functions. For example, if the signal sent by the host device 300 is a refrigeration signal, the first receiving circuit 30 modulates the refrigeration signal and sends it to the controller 200, and the controller 20 controls the slave device 200 to execute the refrigeration function, etc. In this way, the communication between the host device 300 and the slave device 200 is realized.

[0034] Please continue to refer to Figure 3 , the second receiving circuit 40 is connected to both the communication bus 10 and the controller 20. The second receiving circuit 40 is used to receive the signal sent by other slave devices 200 from the communication bus 10 and send it to the controller 20. It can be understood that the host device 300 is connected to multiple slave devices 200 through the communication bus 10, so that data communication is realized between the host device 300 and the multiple slave devices 200 through the communication bus 10. When other slave devices 200 are in the sending state, the signal sent by other slave devices 200 is sent to the second receiving circuit 40 of this slave device 200 through the communication bus 10, so that the second receiving circuit 40 of this slave device 200 receives the signal sent by other slave devices 200. Then, the second receiving circuit 40 of this slave device 200 modulates the signal received from other slave devices 200, and the second receiving circuit 40 of this slave device 200 transmits the processed signal to the controller 20, so as to facilitate the controller 20 to obtain the signal information sent by other slave devices 200, and further facilitate the controller 20 to control this slave device 200 to execute corresponding functions. In this way, the communication between the slave device 200 and the slave device 200 is realized.

[0035] It can be understood that other slave devices 200 are different from this slave device 200. For example, this slave device 200 is the first slave device 200, and other slave devices 200 can be defined as the second slave devices 200 different from the first slave device 200. Therefore, this slave device 200 (the first slave device 200) can receive the signals sent by other slave devices 200 (the second slave devices 200) through the second receiving circuit 40 it has. That is to say, this slave device 200 is any one of multiple slave devices 200. After selecting a certain slave device 200 as this slave device 200, the remaining slave devices 200 are other slave devices 200.

[0036] It should be noted that, by way of example, when the number of slave devices 200 is two, the slave devices 200 may include a first slave device 200 and a second slave device 200. When the second slave device 200 is in the sending state, the signals sent by the second slave device 200 are transmitted to the first slave device 200 through the communication bus 10, so that the second receiving circuit 40 in the first slave device 200 receives the signals sent by the second slave device 200. Then, the second receiving circuit 40 in the first slave device 200 modulates the signals sent by the second slave device 200, and the second receiving circuit 40 transmits the processed signals to the controller 20, so as to facilitate the controller 20 of the first slave device 200 to obtain the signal information sent by the second slave device 200, and further facilitate the controller 20 of the first slave device 200 to control the first slave device 200 to execute corresponding functions.

[0037] Please refer to Figure 2 In addition, the host device 300 and multiple slave devices 200, or between slave devices 200 are all connected through the communication bus 10. That is to say, the host device 300 and multiple slave devices 200 are all directly connected to the communication bus 10, and it is not necessary to connect multiple slave devices 200 in series in a bus topology. Therefore, when there is a need to add a slave device 200 to the multi-connected system 400, only the mains power supply and communication bus 10 connection of the slave device 200 need to be completed to realize the communication between the newly added slave device 200 and the multi-connected system 400, without connecting the communication bus and weak electric cables of the newly added slave device 200 at the end of the already installed multi-connected system 400. In this way, the difficulty of installing and wiring the communication bus 10 is reduced.

[0038] Please refer to Figure 3, the reply circuit 50 is connected to both the communication bus 10 and the controller 20, and the reply circuit 50 is configured to reply signals to the host device 300 or other slave devices 200, or simultaneously to the host device 300 and other slave devices 200 under the control of the controller 20. It can be understood that the controller 20 can reply signals to the host device 300 or other slave devices 200, or simultaneously to the host device 300 and other slave devices 200 according to the state of the communication bus 10. That is, the controller 20 can determine whether the communication bus 10 is in the transmission state of the host device 300 based on the received signal. If the host device 300 is in the transmission state, the controller 20 controls the reply circuit 50 to stop working. If the host device 300 is not in the transmission state, the controller 20 can control the reply circuit 50 to reply signals to at least one of the host device 300 and other slave devices 200, thereby realizing the communication between the host device 300 and the slave device 200, and the communication between the slave device 200 and the slave device 200.

[0039] In the embodiment of the present application, by setting the first receiving circuit 30, when the host device 300 is in the transmission state, the first receiving circuit 30 in the slave device 200 receives the signal sent by the host device 300 from the communication bus 10. After being processed by the first receiving circuit 30, the signal sent by the host device 300 is sent to the controller 20 to realize the communication function between the host device 300 and the slave device 200. Based on this, by setting the second receiving circuit 40, when other slave devices 200 are in the transmission state, the second receiving circuit 40 in the slave device 200 can receive the signals sent by other slave devices 200. The second receiving circuit 40 in the slave device 200 sends the received signals sent by other slave devices 200 to the controller 20 after processing to realize the communication function between the slave device 200 and the slave device 200. At the same time, the air conditioner communication device 100 is also provided with a reply circuit 50. The controller 20 controls the reply circuit 50 to reply signals to at least one of the host device 300 and other slave devices 200 according to the state of the communication bus 10, so as to realize the communication between the host device 300 and the slave device 200 through the communication bus 10 and be compatible with the communication between the slave device 200 and the slave device 200. In this way, the performance of the communication bus 10 is increased.

[0040] Please continue to refer to Figure 3, in some embodiments, the air conditioner communication device 100 further includes an anti-interference circuit 70. The anti-interference circuit 70 is disposed on the communication bus 10 and is connected to the communication bus 10. The anti-interference circuit 70 is used to reduce the interference on the communication bus 10, such as surge interference, common-mode interference, and electrostatic interference. It can be understood that when the host device 300 and the slave device 200 perform data communication through the communication bus 10, there are generally surge interference, common-mode interference, electrostatic interference, etc. on the communication bus 10. At the same time, when the slave device 200 is an indoor unit, there are also various interferences on the main board of the indoor unit. The above-mentioned interferences may affect the communication between the host device 300 and the slave device 200, as well as between the slave device 200 and the slave device 200, thereby reducing the stability of the communication between the host device 300 and the slave device 200, as well as between the slave device 200 and the slave device 200.

[0041] Please continue to refer to Figure 3 , for this reason, by setting the anti-interference circuit 70 on the communication bus 10 and connecting the anti-interference circuit 70 to the communication bus 10, when the host device 300 and multiple slave devices 200 achieve data communication through the communication bus 10, the signals on the communication bus 10 first pass through the anti-interference circuit 70 for filtering to prevent interference such as surge interference, common-mode interference, and electrostatic interference on the communication bus 10 from entering the slave device 200, thereby preventing damage to the components in the slave device 200. At the same time, the anti-interference circuit 70 can also prevent the interference in the slave device 200 from entering the communication bus 10 to ensure the stability of the signals on the communication bus 10. In this way, the anti-interference ability of the communication bus 10 is improved.

[0042] In the actual application process, the communication bus 10 includes a first communication bus P1 and a second communication bus P2. The anti-interference circuit 70 can be composed of two resistors, a common-mode inductor, and two transient diodes. Among them, the two resistors and the common-mode inductor form the first part of the anti-interference circuit 70, and the first part of the anti-interference circuit 70 is connected to the first communication bus P1 and the second communication bus P2. When the host device 300 is in the sending state, the signals on the communication bus 10 pass through the first part of the anti-interference circuit 70 composed of two resistors and a common-mode inductor for filtering to prevent the common-mode interference and surge interference attached to the communication bus 10 from being directly transmitted to the components in the slave device 200. When the slave device 200 is in the sending state, the signals input into the communication bus 10 are filtered by the first part of the anti-interference circuit 70 composed of two resistors and a common-mode inductor to prevent the interference in the slave device 200 from entering the communication bus 10, that is, to prevent the interference on the main board of the indoor unit from entering the communication bus 10. In this way, the occurrence of packet loss on the communication bus 10 can be avoided.

[0043] Further, two transient diodes form the second part of the anti-interference circuit 70. It can be understood that during the installation of the communication bus 10, there is often some human static electricity attached to the communication bus 10, that is, the above-mentioned static interference. After the static interference enters the slave device 200 through the communication bus 10, the static interference is likely to damage the chip receiving port inside the slave device 200, thereby affecting the working function of the slave device 200. By setting two transient diodes, the static interference can be filtered. That is, when the host device 300 and the slave device 200 communicate through the communication bus 10, the transmission signal on the communication bus 10 is filtered through the first part of the anti-interference circuit 70 to remove the common-mode interference and surge interference on the communication bus 10. Then, the transmission signal on the communication bus 10 continues to be filtered through the second part of the anti-interference circuit 70 composed of two transient diodes to prevent the human static electricity or other interference during the installation of the communication bus 10 from entering the slave device 200, thereby avoiding the damage of the chip receiving port inside the slave device 200. In this way, the working performance of the slave device 200 is improved.

[0044] Please continue to refer to Figure 3 In some embodiments, the air conditioner communication device 100 further includes a rectifying circuit 60. The rectifying circuit 60 is connected to the communication bus 10, the first receiving circuit 30, the second receiving circuit 40, and the reply circuit 50, and the rectifying circuit 60 can be connected to an external power supply VCC so that the rectifying circuit 60 can supply power to the slave device 200. That is, the rectifying circuit 60 rectifies the current signal output on the communication bus 10, and the communication bus 10 realizes the non-polar communication and non-polar power supply functions for the slave device 200. In this way, the installation cost of the communication bus 10 is reduced.

[0045] In addition, based on the fact that the air conditioner communication device 100 includes an anti-interference circuit 70, the input end of the rectifying circuit 60 is connected to the output end of the anti-interference circuit 70. The rectifying circuit 60 is used to rectify the current signal output by the anti-interference circuit 70 to realize the non-polar communication and non-polar power supply functions for the slave device 200.

[0046] Please continue to refer to Figure 3 Further, the communication bus 10 includes a first communication bus P1 and a second communication bus P2. In some embodiments, the rectifying current includes a rectifying bridge 61, a first diode D1, and a second diode D2.

[0047] Specifically, the rectifier bridge 61 is used to implement the non-polar power supply function of the slave device 200. The rectifier bridge 61 is connected to the first communication bus P1 and the second communication bus P2, and the rectifier bridge 61 is used to access the external power supply VCC. It can be understood that the rectifier bridge 61 can be composed of a bridge stack and a switching tube, and the rectifier bridge 61 is connected to the power supply system of the slave device 200, and then rectifies the current signal output by the communication bus 10 to implement the non-polar power supply function of the communication bus 10. That is, after the rectifier circuit 60 rectifies the current signal output by the communication bus 10, the rectifier circuit 60 outputs a DC power supply, and the rectifier circuit 60 is connected to the power supply system of the slave device 200, so that the communication bus 10 supplies power to the slave device 200. That is, the rectifier bridge 61 realizes the non-polar power supply of the slave device 200. At the same time, the rectifier circuit 60 connects the communication bus 10 and the reference ground of the power supply system of the slave device 200 together. That is, the rectifier circuit 60 can realize the common ground of the communication bus 10 and the power supply system of the slave device 200, thus reducing the interference on the communication bus 10.

[0048] The first diode D1 and the second diode D2 are used to implement the non-polar communication function of the communication bus 10. Among them, the anode of the first diode D1 is connected to the rectifier bridge 61 and the first communication bus P1, and the cathode of the first diode D1 is connected to the first receiving circuit 30, the second receiving circuit 40, and the reply circuit 50. The anode of the second diode D2 is connected to the rectifier bridge 61 and the second communication bus P2, and the cathode of the second diode D2 is connected to the first receiving circuit 30, the second receiving circuit 40, and the reply circuit 50. It can be understood that through the one-way conduction of the first diode D1 and the second diode D2, the signal on the communication bus 10 is collected without polarity, and then the non-polar communication function of the communication bus 10 is realized. In this way, the reliability of the communication on the communication bus 10 is improved.

[0049] Furthermore, when the host device 300 conducts data communication with multiple slave devices 200 through the communication bus 10, or when this slave device 200 conducts data communication with other slave devices 200 through the communication bus 10, the first communication bus P1 can be the positive pole and the second communication bus P2 can be the negative pole. At this time, the first diode D1 conducts, so that the signal communicates through the first communication bus P1; the second communication bus P2 can be the positive pole and the first communication bus P1 can be the negative pole. At this time, the second diode D2 conducts, so that the signal communicates through the second communication bus P2. In this way, through the one-way conduction of the first diode D1 and the second diode D2, regardless of the polarity state of the first communication bus P1 and the second communication bus P2, the signal in the communication bus 10 can be collected without polarity, thereby realizing the non-polar communication function of the communication bus 10.

[0050] Please refer to Figure 4, in some embodiments, the second receiving circuit 40 includes a voltage dividing circuit 41 and an overvoltage protection circuit 42. The voltage dividing circuit 41 is connected to the communication bus 10, and the overvoltage protection circuit 42 is connected to both the voltage dividing circuit 41 and the controller 20. Among them, when other slave devices 200 are in the sending state, the voltage dividing circuit 41 of the slave device 200 can receive the signals sent by other slave devices 200 from the communication bus 10. The voltage dividing circuit 41 of the slave device 200 divides the received signals sent by other slave devices 200 into corresponding voltage signals, and the corresponding voltage signals flow through the overvoltage protection circuit 42 and then are input to the controller 20 for reception, so that the controller 20 can obtain the signal information sent by other slave devices 200, and further facilitate the controller 20 to control the slave device 200 to perform corresponding functions.

[0051] Please continue to refer to Figure 4 , further, in some embodiments, the voltage dividing circuit 41 includes a first resistor R1, a magnetic ring L1, and a second resistor R2. The first end of the first resistor R1 is connected to the communication bus 10. When other slave devices 200 are in the sending state, the second receiving circuit 40 of the slave device 200 can receive the signals sent by other slave devices 200 from the communication bus 10; the second end of the first resistor R1 is connected to the first end of the magnetic ring L1, the second end of the magnetic ring L1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. It can be understood that the magnetic ring L1 is a ring-shaped magnetic conductor, and the magnetic ring L1 is a commonly used anti-interference component, which has a good inhibitory effect on high-frequency noise. Therefore, the magnetic ring L1 has the function of anti-surge and other interferences in the voltage dividing circuit 41, so that the voltage dividing circuit 41 receives stable signals.

[0052] The overvoltage protection circuit 42 includes a first switching tube Q1 and a third resistor R3. The control end of the first switching tube Q1 is connected to the second end of the first resistor R1. The input end of the first switching tube Q1 is connected to an external power supply VCC, and the output end of the first switching tube Q1 is grounded through the third resistor R3. Among them, the third resistor Q3 has a current limiting function; the output end of the first switching tube Q1 is connected to the controller 20. It can be understood that the resistance values of the first resistor R1 and the second resistor R2 in the voltage dividing circuit 41 are different, and the second receiving circuit 40 adjusts the resistance value of the first resistor R1 or the second resistor R2 according to the received signal, so that the second receiving circuit 40 of the slave device 200 modulates the received signal into a corresponding voltage signal. When the first switching tube Q1 is in the conducting state, the voltage signal is input to the controller 20, so that the controller 20 controls the slave device 200 to perform corresponding functions according to the voltage signal.

[0053] It should be noted that the first switching transistor Q1 can be a device with a switching function such as an NMOS transistor, a PMOS transistor, an NPN bipolar junction transistor, a PNP bipolar junction transistor, and a relay, or other devices or circuits with a switching function. The embodiments of the present application do not make specific limitations thereon.

[0054] Taking the first switching transistor Q1 as an NPN bipolar junction transistor as an example, the base of the NPN bipolar junction transistor is connected to the second end of the first resistor R1, the collector of the NPN bipolar junction transistor is connected to an external power supply VCC, and the emitter of the NPN bipolar junction transistor is grounded through the third resistor R3. When the voltage at the base of the NPN bipolar junction transistor is greater than the voltage at the collector of the NPN bipolar junction transistor, the voltage at the base of the NPN bipolar junction transistor will break down the collector of the NPN bipolar junction transistor, so that the voltage at the base of the NPN bipolar junction transistor flows to the external power supply VCC, thereby playing an overvoltage protection role for the second receiving circuit 40.

[0055] Please refer to Figure 5 , further, in some embodiments, the voltage dividing circuit 41 further includes a second switching transistor Q2. The control end of the second switching transistor Q2 is connected to the control end of the first switching transistor Q1 and is connected to the communication bus 10 through the first resistor R1. The input end of the second switching transistor Q2 is connected to the communication bus 10 through the magnetic ring L1 and the first resistor R1. The output end of the second switching transistor Q2 is grounded through the second resistor R2. It can be understood that when other slave devices 200 are in the sending state, the second receiving circuit 40 on the present slave device 200 can receive signals sent by other slave devices 200 from the communication bus 10. At this time, the first switching transistor Q1 and the second switching transistor Q2 are turned on, and a first voltage is formed between the control end and the output end of the first switching transistor Q1, and a second voltage is formed between the control end and the output end of the second switching transistor Q2. Since the first switching transistor Q1 and the second switching transistor Q2 are symmetrically arranged, the first voltage is equal to the second voltage. At this time, the second receiving circuit 40 adjusts the resistance value of the second resistor R2 or the third resistor R3 according to the received signal, so that the second receiving circuit 40 on the present slave device 200 modulates the received signal into a corresponding voltage signal, and further enables the output end of the first switching transistor Q1 to output a corresponding voltage signal to the controller 20 for reception. The controller 20 controls the present slave device 200 to perform corresponding functions according to the corresponding voltage signal.

[0056] Please refer to Figure 4 , further, in some embodiments, the voltage dividing circuit 41 further includes a filter capacitor C1. One end of the filter capacitor C1 is connected to the control end of the first switching transistor Q1, and the other end of the filter capacitor C1 is grounded. It can be understood that the filter capacitor C1 can filter the input current, so that the current output from the output end of the first switching transistor Q1 is smoother. In this way, the communication stability of the communication bus 10 is improved.

[0057] Please refer to Figure 6 Figure 6 In some embodiments, the reply circuit 50 includes a third switching transistor Q3, a fourth switching transistor Q4, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.

[0058]

[0058] Specifically, the control terminal of the third switching transistor Q3 is connected to the control terminal of the fourth switching transistor Q4, and the control terminal of the third switching transistor Q3 is connected to the controller 20 through the fourth resistor R4. The input terminal of the third switching transistor Q3 is connected to the controller 20 through the fourth resistor R4. The output terminal of the third switching transistor Q3 is grounded through the fifth resistor R5. The input terminal of the fourth switching transistor Q4 is connected to the communication bus 10. The output terminal of the fourth switching transistor Q4 is grounded through the sixth resistor R6. At this time, when the host device 300 is not in the transmission state, the controller 20 controls the reply circuit 50 to work. At this time, the third switching transistor Q3 and the fourth switching transistor Q4 are turned on, and a third voltage is formed between the control terminal and the output terminal of the third switching transistor Q3, and a fourth voltage is formed between the control terminal and the output terminal of the fourth switching transistor Q4. Since the third switching transistor Q3 and the fourth switching transistor Q4 are symmetrically arranged, the third voltage is equal to the fourth voltage. By adjusting the resistance value of the fifth resistor R5 or the sixth resistor R6 in the reply circuit 50, the reply circuit 50 pulls current on the communication bus 10, thereby enabling the reply circuit 50 to send reply signals to the host device 300 or other slave devices 200, or simultaneously to the host device 300 and other slave devices 200, so as to realize communication between the host device 300 and the slave device 200, and communication between the slave devices 200. In this way, the performance of the communication bus 10 is improved.

[0059]

[0059] It should be noted that the reply circuit 50 may be a proportional current source circuit composed of the third switching transistor Q3, the fourth switching transistor Q4, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6, or may be other current source circuits. The embodiment of the present application does not specifically limit the circuit form of the reply circuit 50.

[0060]

[0060] It should be noted that the above-mentioned second switching transistor Q2, third switching transistor Q3, and fourth switching transistor Q4 may be devices with switching functions such as NMOS transistors, PMOS transistors, NPN bipolar transistors, PNP bipolar transistors, and relays, or may be other devices or circuits with switching functions. The embodiment of the present application does not specifically limit this.

[0061] Please refer to Figure 7, in some embodiments, the first receiving circuit 30 includes a seventh resistor R7 and an eighth resistor R8. Wherein, the first end of the seventh resistor R7 is connected to the communication bus 10, the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, and the second end of the seventh resistor R7 is also connected to the controller 20. Thus, when the host device 300 is in the sending state, after the first end of the seventh resistor R7 receives the signal sent by the host device 300, by adjusting the resistance value of the seventh resistor R7 or the eighth resistor R8, the first receiving circuit 30 modulates the received signal sent by the host device 300 into a corresponding voltage signal, and the first receiving circuit 30 outputs the voltage signal to the controller 20 through the second end of the seventh resistor R7, so that the controller 20 controls the slave device 200 to perform corresponding functions. Thus, communication between the host device 300 and the slave device 200 is achieved.

[0062] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0063] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air conditioning communication device, characterized in that: Applied to a slave device, the air conditioner communication device comprises: Communication buses and controllers; A first receiving circuit, connected to both the communication bus and the controller, for receiving a signal sent by a host device from the communication bus and sending the signal to the controller; A second receiving circuit is connected to the communication bus and the controller, and is used to receive signals sent by other slave devices from the communication bus and send the signals to the controller; and A reply circuit is connected to both the communication bus and the controller, and is used for replying signals to the host device and / or the other slave devices under the control of the controller.

2. The air conditioning communication device according to claim 1, characterized in that: The second receiving circuit comprises: a voltage divider circuit connected to the communication bus, and The overvoltage protection circuit is connected to both the voltage divider circuit and the controller.

3. The air conditioning communication device according to claim 2, characterized in that: The voltage divider circuit includes a first resistor, a magnetic ring and a second resistor, wherein a first end of the first resistor is connected to the communication bus, a second end of the first resistor is connected to a first end of the magnetic ring, a second end of the magnetic ring is connected to a first end of the second resistor, and a second end of the second resistor is grounded; The overvoltage protection circuit includes a first switch tube and a third resistor, the control end of the first switch tube is connected to the second end of the first resistor, the input end of the first switch tube is connected to an external power supply, the output end of the first switch tube is grounded through the third resistor, and the output end of the first switch tube is connected to the controller.

4. The air conditioning communication device according to claim 3, characterized in that: The voltage divider circuit further includes: A second switch tube, wherein the control end of the second switch tube is connected to the control end of the first switch tube and is connected to the communication bus through the first resistor, the input end of the second switch tube is connected to the communication bus through the magnetic ring and the first resistor, and the output end of the second switch tube is grounded through the second resistor.

5. The air conditioning communication device according to claim 3 or 4, characterized in that: The voltage divider circuit further includes a filter capacitor, one end of which is connected to the control end of the first switch tube, and the other end of which is grounded.

6. The air conditioning communication device according to claim 1, characterized in that: The recovery circuit includes a third switch tube, a fourth switch tube, a fourth resistor, a fifth resistor and a sixth resistor; The control end of the third switch tube is connected to the control end of the fourth switch tube, and is connected to the controller through the fourth resistor, the input end of the third switch tube is connected to the controller through the fourth resistor, and the output end of the third switch tube is grounded through the fifth resistor; An input end of the fourth switch tube is connected to the communication bus, and an output end of the fourth switch tube is grounded through the sixth resistor.

7. The air conditioning communication device according to claim 1, characterized in that: The first receiving circuit includes a seventh resistor and an eighth resistor; The first end of the seventh resistor is connected to the communication bus, the second end of the seventh resistor is connected to the first end of the eighth resistor, and is connected to the controller; A second end of the eighth resistor is grounded.

8. The air conditioning communication device according to claim 1, characterized in that: The air conditioning communication device also includes: The rectifier circuit is connected to the communication bus, the first receiving circuit, the second receiving circuit and the reply circuit, and is connected to an external power supply to supply power to the slave device.

9. The air conditioning communication device according to claim 8, characterized in that: The communication bus includes a first communication bus and a second communication bus, and the rectifier circuit includes: A rectifier bridge, connected to the first communication bus and the second communication bus, and used to access the external power supply; A first diode, an anode of which is connected to the rectifier bridge and the first communication bus, and a cathode of which is connected to the first receiving circuit, the second receiving circuit and the reply circuit; and The second diode has an anode connected to the rectifier bridge and the second communication bus, and a cathode connected to the first receiving circuit, the second receiving circuit and the reply circuit.

10. The air conditioning communication device according to claim 1, characterized in that: Also includes: The anti-interference circuit is arranged on the communication bus and connected to the communication bus.

11. A slave device, characterized in that: include: The air conditioning communication device according to any one of claims 1 to 10; as well as, A housing, wherein the air conditioning communication device is arranged in the housing.

12. A multi-link system, characterized in that: include: Host device; as well as, A plurality of slave devices as claimed in claim 11, different slave devices, and the slave devices and the host device are communicatively connected via the communication bus.

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