Communication circuit based on wire controller, wire controller and air conditioning system

Abstract

The application relates to a communication circuit based on a wire controller, the wire controller and an air conditioning system. The circuit comprises a wire controller main chip, a communication chip, a communication state control module, a communication and power supply control module and an indoor unit; the wire controller main chip is connected with the communication chip and the communication state control module; the communication state control module is connected with the communication chip and the communication and power supply control module; the communication and power supply control module is connected with the indoor unit through a power supply bus; when the communication chip is normal, the communication chip is used for converting a communication signal sent by the wire controller main chip and coupling the signal to the power supply bus based on the communication and power supply control module to output to the indoor unit; when the communication chip is abnormal, the communication state control module is used for turning on the wire controller main chip and the communication and power supply control module to transmit the communication signal to the communication and power supply control module, and coupling the signal to the power supply bus to transmit to the indoor unit. Through the communication between the wire controller main chip and the indoor unit when the communication chip is abnormal, the reliability of the communication between the wire controller and the indoor unit can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and in particular to communication circuits based on wired controllers, wired controllers, and air conditioning systems. Background Technology

[0002] The wired controller is a multi-functional intelligent accessory widely used in commercial and residential ducted air conditioning systems, providing users with a convenient operating experience. For installation, the wired controller utilizes a simple wall-mounted method and connects seamlessly to the indoor unit of the air conditioner via carrier communication, relying on only two power supply buses. These two power supply buses not only provide power to ensure the wired controller's normal operation but also handle communication, enabling data transmission and control command issuance between the wired controller and the indoor unit.

[0003] However, when the communication chip or communication circuit is damaged due to factors such as prolonged use, unstable voltage, or external interference, the wired controller loses its ability to communicate with the indoor unit of the air conditioner. This prevents users from operating the air conditioner through the wired controller until it is repaired. Therefore, it is crucial to ensure that the wired controller can still easily communicate with the indoor unit even when the communication chip or communication circuit is damaged, restoring some functions of both the wired controller and the air conditioner, improving the user experience, and enhancing the reliability of the wired controller. Utility Model Content

[0004] This application provides a communication circuit based on a wired controller, a wired controller, and an air conditioning system to solve the technical problem that the wired controller cannot communicate with the indoor unit of the air conditioner when the communication chip or communication circuit is damaged, resulting in poor communication reliability between the wired controller and the indoor unit of the air conditioner.

[0005] According to one aspect of the embodiments of this application, this application provides a communication circuit based on a wired controller, including a wired controller main chip, a communication chip, a communication status control module, a communication and power control module, and an indoor unit; the wired controller main chip is connected to one end of the communication chip and the communication status control module, the other end of the communication status control module and the communication chip is connected to one end of the communication and power control module, and the other end of the communication and power control module is connected to the indoor unit through a power supply bus; when the communication chip communicates normally, the communication chip is used to convert the communication signal sent by the wired controller main chip and perform signal coupling based on the communication and power control module, so as to couple the converted communication signal to the power supply bus and output it to the indoor unit through the power supply bus; when the communication chip communicates abnormally, the communication status control module is used to connect the wired controller main chip and the communication and power control module, transmit the communication signal sent by the wired controller main chip to the communication and power control module for signal coupling, so as to couple the communication signal to the power supply bus and transmit it to the indoor unit through the power supply bus.

[0006] Optionally, the main chip of the wired controller includes a first port, a second port, and a third port; when the communication chip is communicating normally, the first port of the main chip of the wired controller is the receiving end, the second port of the main chip of the wired controller is the transmitting end, and the third port of the main chip of the wired controller is the enabling end; when the communication chip is malfunctioning, the first port and the second port of the main chip of the wired controller are the transmitting end, and the third port of the main chip of the wired controller is the enabling end.

[0007] Optionally, the communication status control module includes a first switch and a second switch; the bases of the first switch and the second switch are connected to the third port of the wire controller main chip, the collector of the first switch is connected to the first port of the wire controller main chip, the collector of the second switch is connected to the second port of the wire controller main chip, and the emitters of the first switch and the second switch are connected to the communication and power control module.

[0008] Optionally, when the communication chip experiences a communication malfunction, the first port of the wired controller main chip is used to output a first differential signal to the collector of the first switching transistor, the second port of the wired controller main chip is used to output a second differential signal to the collector of the second switching transistor, and the third port of the wired controller main chip is used to output a high-level signal to the bases of the first and second switching transistors. The internal unit is used to receive the first differential signal and the second differential signal, calculate the difference, and identify whether the difference conforms to a first difference range or a second difference range. If the difference conforms to the first difference range and the internal unit outputs a first digital signal, or if the difference conforms to the second difference range and the internal unit outputs a second digital signal, then the internal unit is further used to determine that the communication line based on the communication status control module is functioning normally.

[0009] Optionally, the communication and power control module includes a first resistor, a second resistor, a first capacitor, and a second capacitor; the first resistor and the first capacitor are connected in series, and one end of the first resistor is connected to the communication chip and the emitter of the first switching transistor, and one end of the first capacitor is connected to the first interface of the indoor unit through the ground wire of the power supply bus; the second resistor and the second capacitor are connected in series, and one end of the second resistor is connected to the communication chip and the emitter of the second switching transistor, and one end of the second capacitor is connected to the second interface of the indoor unit through the power line of the power supply bus.

[0010] Optionally, it also includes a power conversion module, one end of which is connected to the power supply bus, and the other end of which is connected to the wired controller main chip and the communication chip, for converting power obtained from the indoor unit into the working power of the wired controller main chip and the communication chip.

[0011] Optionally, after the wired controller main chip sends a communication signal based on the communication chip, the wired controller main chip is also used to receive feedback signals transmitted back by the indoor unit based on the communication and power control module and the communication chip through the receiving end. If the feedback signal is not received within a preset time, the wired controller main chip determines that the communication chip is abnormal.

[0012] Optionally, it also includes a wired controller display module, which is connected to the main chip of the wired controller. The wired controller display module is used for function display and for issuing fault prompts when communication is abnormal.

[0013] According to another aspect of the embodiments of this application, this application provides a wired controller, including the communication circuit based on the wired controller described above.

[0014] According to another aspect of the embodiments of this application, this application provides an air conditioning system, the air conditioner including: at least one indoor unit; and a wired controller as described above, the wired controller communicating with the indoor unit based on the wired controller-based communication circuit.

[0015] Compared with related technologies, the technical solutions provided in this application have the following advantages:

[0016] This application provides a communication circuit based on a wired controller. By adding a communication status control module to the circuit for interaction between the wired controller and the indoor unit, one end of the communication status control module is connected to the main chip of the wired controller, and the other end is connected to the communication and power control module, which is then connected to the indoor unit via the power supply bus. If the communication chip malfunctions and communication cannot be achieved, the main chip of the wired controller can control the communication status control module to conduct, thereby establishing the connection between the main chip of the wired controller and the indoor unit. Even if the communication chip malfunctions, the communication signal emitted by the main chip of the wired controller can still be coupled to the power supply bus based on the communication status control module. Utilizing the DC-blocking and AC-passing characteristics of the communication and power control module, the communication signal can be transmitted to the indoor unit, thus achieving communication between the main chip of the wired controller and the indoor unit and improving the reliability of communication between the wired controller and the indoor unit. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an optional communication circuit based on a wire controller provided according to an embodiment of this application;

[0020] Figure 2 This is a control flowchart of an optional communication circuit based on a wire controller according to an embodiment of this application;

[0021] Figure 3 This is a circuit diagram of an optional communication circuit based on a wire controller according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of another optional wire-controlled communication circuit provided according to an embodiment of this application.

[0023] Figure descriptions: 1. Main chip of wired controller, 2. Communication chip, 3. Communication status control module, 4. Communication and power control module, 5. Indoor unit, 6. Power conversion module. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The principles and structure of this application will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] To address the aforementioned technical issue of poor communication reliability between the wired controller and the indoor unit of the air conditioner when the communication chip or communication circuit is damaged.

[0027] To address the aforementioned issues, this application proposes a design that adds a communication status control module to the circuit connecting the wired controller and the indoor unit. One end of the communication status control module is connected to the wired controller's main chip, and the other end is connected to the communication and power control module, which in turn connects to the indoor unit via the power supply bus. If the communication chip malfunctions and communication fails, the wired controller's main chip can control the communication status control module to conduct, thereby establishing the connection between the wired controller's main chip and the indoor unit. Even if the communication chip malfunctions, the communication signal emitted by the wired controller's main chip can still be coupled to the power supply bus based on the communication status control module. Utilizing the DC-blocking and AC-passing characteristics of the communication and power control module, the communication signal can be transmitted to the indoor unit, thus achieving communication between the wired controller's main chip and the indoor unit and improving the reliability of communication between the wired controller and the indoor unit.

[0028] Combination Figure 1 As shown in the embodiment of this application, a communication circuit based on a wired controller is provided, including a wired controller main chip 1, a communication chip 2, a communication status control module 3, a communication and power control module 4, and an indoor unit 5.

[0029] The main chip 1 of the wired controller is connected to one end of the communication chip 2 and the communication status control module 3. The other end of the communication status control module 3 and the communication chip 2 is connected to one end of the communication and power control module 4. The other end of the communication and power control module 4 is connected to the indoor unit 5 through the power supply bus.

[0030] When the communication chip 2 is in normal communication mode, the communication chip 2 is used to convert the communication signal sent by the main chip 1 of the wired controller, and to couple the signal based on the communication and power control module 4, so as to couple the converted communication signal to the power supply bus and output it to the indoor unit 5 through the power supply bus.

[0031] When communication chip 2 malfunctions, communication status control module 3 is used to connect the main chip 1 of the wired controller and the communication and power control module 4, and transmit the communication signal sent by the main chip 1 of the wired controller to the communication and power control module 4 for signal coupling, so as to couple the communication signal to the power supply bus and transmit it to the indoor unit 5 through the power supply bus.

[0032] In this embodiment, the indoor unit 5 is an air conditioner indoor unit, and the corresponding wired controller is used for controlling the air conditioner indoor unit. The communication method between the main chip 1 of the wired controller and the indoor unit 5 is carrier communication, which is a communication and power supply method that couples power and communication signals together. On the power supply bus (power line and ground line), there is both the working power supplied by the indoor unit 5 to the main chip 1 of the wired controller, and the communication signals sent by the main chip 1 of the wired controller or the indoor unit 5.

[0033] The aforementioned main chip 1 of the wired controller can be used to control the transmission of communication signals, the reception of feedback signals from the indoor unit 5, the prompting of abnormal situations, the control of the operating mode of the indoor unit 5, and the status display. The aforementioned communication chip 2 can be used to convert the communication signals sent by the main chip 1 of the wired controller and send them to the communication and power control module 4 when the communication chip 2 is functioning normally. The aforementioned communication status control module 3 can be used to establish the connection between the main chip 1 of the wired controller and the communication and power control module 4 when the communication chip 2 is malfunctioning, sending the communication signals sent by the main chip 1 of the wired controller to the communication and power control module 4. The aforementioned communication and power control module 4 can utilize the DC-blocking and AC-passing characteristics to achieve the coupling and separation of carrier communication and DC power supply, so as to couple the communication signals transmitted from the communication chip 2 or the communication status control module 3 onto the power supply bus and transmit them to the indoor unit 5 through the power supply bus. The aforementioned indoor unit 5 can be used to interact with the main chip 1 of the wired controller, provided that communication with the main chip 1 of the wired controller is possible, and can perform various operating controls on the indoor unit of the air conditioner according to different instructions sent by the main chip 1 of the wired controller.

[0034] In some examples, the communication chip 2 is integrated into the wired controller. Combined with... Figure 2 As shown, when the communication chip 2 is in normal working condition, the main chip 1 of the wired controller and the indoor unit 5 can communicate normally. By connecting one end of the communication chip 2 to the main chip 1 of the wired controller and the other end to one end of the communication and power control module 4, and the other end of the communication and power control module 4 to the indoor unit 5 through the power supply bus, the communication chip 2 can convert the communication signal sent by the main chip 1 of the wired controller into a protocol. Utilizing the DC-blocking and AC-passing characteristics of the communication and power control module 4, the DC power supply on the power supply bus is isolated, but the converted communication signal can pass through and be output to the indoor unit 5, thereby controlling the operation of the air conditioner.

[0035] The communication signal can be sent via UART. Communication chip 2 converts the UART signal into a preset HomeBus protocol signal and couples it to the power supply bus, transmitting it to indoor unit 5 via carrier communication. After indoor unit 5 recognizes the communication signal sent by the main controller chip 1, it can send a feedback signal to the main controller chip 1, indicating that the communication is normal. Subsequently, indoor unit 5 can receive various control commands sent by the main controller chip 1, thereby driving the air conditioner to perform various operations, such as adjusting the working mode and increasing the airflow. The various control commands sent by the main controller chip 1 can refer to various commands issued by the user.

[0036] In other examples, combined Figure 2As shown, when communication chip 2 malfunctions, the main chip 1 of the wired controller and the indoor unit 5 cannot communicate through communication chip 2. At this time, the main chip 1 of the wired controller can send a low-level signal to the communication status control module 3 to control the communication status control module 3 to conduct. Simultaneously, when the low-level signal is output, communication chip 2 disconnects, allowing the communication status control module 3 to connect the main chip 1 of the wired controller and the communication and power control module 4. This allows the communication signal sent by the main chip 1 of the wired controller to be coupled to the power supply bus. Utilizing the DC-blocking and AC-passing characteristics of the communication and power control module 4, the DC power on the power supply bus is isolated, and the communication signal transmitted by the communication status control module 3 is output to the indoor unit 5, thereby controlling the operation of the indoor air conditioner. In other words, even when communication chip 2 malfunctions, communication between the main chip 1 of the wired controller and the indoor unit 5 can still be achieved, enabling data interaction between the two.

[0037] In this embodiment, a communication status control module 3 is added to the circuit that allows interaction between the wired controller and the indoor unit 5. One end of the communication status control module 3 is connected to the wired controller main chip 1, and the other end is connected to the communication and power control module 4, which is then connected to the indoor unit 5 via the power supply bus. If the communication chip 2 malfunctions and communication is not possible, the wired controller main chip 1 can control the communication status control module 3 to conduct, thereby establishing the connection between the wired controller main chip 1 and the indoor unit 5. Even if the communication chip 2 malfunctions, the communication signal emitted by the wired controller main chip 1 can still be coupled to the power supply bus via the communication status control module 3. The communication signal can then be transmitted to the indoor unit 5 using the DC blocking and AC passing characteristics of the communication and power control module 4, thus achieving communication between the wired controller main chip 1 and the indoor unit 5 and improving the reliability of communication between the wired controller and the indoor unit 5.

[0038] In some alternative embodiments, combined with Figure 3 As shown, the main chip 1 of the wired controller includes a first port, a second port, and a third port;

[0039] When communication chip 2 is communicating normally, the first port of the main chip 1 of the wired controller is the receiving end, the second port of the main chip 1 of the wired controller is the transmitting end, and the third port of the main chip 1 of the wired controller is the enabling end.

[0040] When communication chip 2 malfunctions, the first and second ports of the main chip 1 of the wired controller become the transmitting end, and the third port of the main chip 1 of the wired controller becomes the enabling end.

[0041] In some examples, the main chip 1 of the wired controller includes a first port, a second port, and a third port. Other ports, such as a power port, may also be included. Since communication based on the communication chip 2 is the default communication mode, and communication based on the communication status control module 3 is the backup mode, when the communication chip 2 is functioning normally, the first, second, and third ports are connected to the communication chip 2. The first port on the main chip 1 acts as the receiver, the second port as the transmitter, and the third port as the enable port. Specifically, the receiver is used by the main chip 1 to receive signals sent by the indoor unit 5 based on the communication chip 2; the transmitter is used by the main chip 1 to send signals to the indoor unit 5 based on the communication chip 2; and the enable port outputs a high level to activate the communication chip 2 and deactivate the communication status control module 3.

[0042] In other examples, if the communication chip 2 fails to achieve normal communication, the communication program of the wired controller main chip 1 can be formatted. The first and second ports of the wired controller main chip 1 are configured as transmitting ends, while the third port still acts as an enable end, outputting a low level to control the communication chip 2 to disconnect and the communication status control module 3 to turn on. When the communication status control module 3 is on, the first and second ports cooperate to send differential signals in the format corresponding to communication using the communication status control module 3. This allows the indoor unit 5 to determine whether communication with the wired controller main chip 1 can be achieved based on the received differential signals, so as to further perform data interaction.

[0043] In this embodiment, when the communication chip 2 fails to achieve the communication function, the functions of the three ports of the wired controller main chip 1 are adjusted so that when the enable terminal outputs a low level to control the communication chip 2 to disconnect and the communication status control module 3 to be turned on, the wired controller main chip 1 can send differential signals to the indoor unit 5 through the first port and the second port, which are the transmitting end, respectively. This allows the indoor unit 5 to determine whether it can communicate with the wired controller main chip 1 and perform data interaction based on the received differential signals.

[0044] In some alternative embodiments, combined with Figure 3 As shown, the communication status control module 3 includes a first switch and a second switch;

[0045] The bases of the first and second switching transistors are connected to the third port of the main chip 1 of the wire controller. The collector of the first switching transistor is connected to the first port of the main chip 1 of the wire controller. The collector of the second switching transistor is connected to the second port of the main chip 1 of the wire controller. The emitters of the first and second switching transistors are connected to the communication and power control module 4.

[0046] In this embodiment, the first switch Q1 and the second switch Q2 can be PNP transistors, PMOS transistors, or other circuits with low-level turn-on and high-level turn-off. In this embodiment, the first switch Q1 and the second switch Q2 are described as PNP transistors.

[0047] In this embodiment, when the communication chip 2 malfunctions, because the bases of PNP transistors Q1 and Q2 are connected to the enable terminal (third port) of the main chip 1 of the wire controller, a low-level signal is emitted through the enable terminal, causing the damaged communication chip 2 to stop working. At this time, the bases of PNP transistors Q1 and Q2 receive the low-level signal, and the emitters of PNP transistors Q1 and Q2 are connected to the power supply bus. The base voltage is lower than the emitter voltage, and PNP transistors Q1 and Q2 are turned on after meeting the conduction conditions.

[0048] Furthermore, after PNP transistors Q1 and Q2 are turned on, the differential signal emitted by the main chip 1 of the wired controller can be coupled to the power supply bus after DC blocking and AC switching based on the communication and power control module 4, and then the differential signal is transmitted to the indoor unit 5 through carrier communication based on the power supply bus.

[0049] In this embodiment, the bases of PNP transistors Q1 and Q2 are connected to the enable terminals of the main chip 1 of the wired controller, and the emitters are connected to the power supply bus. When the enable terminal outputs a low-level signal, PNP transistors Q1 and Q2 can be turned on, and the faulty communication chip 2 can be turned off. This allows the differential signal generated by the main chip 1 of the wired controller to be coupled to the power supply bus after DC-DC blocking and AC-DC switching by the communication and power control module 4. The differential signal is then transmitted to the indoor unit 5 via the power supply bus. This ensures that if the communication chip 2 fails and the indoor unit 5 determines that communication can be achieved through the backup communication method, communication can be established using PNP transistors Q1 and Q2. This helps to ensure normal data interaction between the main chip 1 of the wired controller and the indoor unit 5, improves reliability, and guarantees the user experience.

[0050] In some optional embodiments, when the communication chip 2 malfunctions, the first port of the wire controller main chip 1 is used to output a first differential signal to the collector of the first switching transistor, the second port of the wire controller main chip 1 is used to output a second differential signal to the collector of the second switching transistor, and the third port of the wire controller main chip 1 is used to output a high-level signal to the base of the first and second switching transistors.

[0051] The indoor unit 5 is used to receive the first differential signal and the second differential signal, calculate the difference, and identify whether the difference conforms to the first difference range or the second difference range.

[0052] If the difference is within the first difference range and the indoor unit 5 outputs the first digital signal, or if the difference is within the second difference range and the indoor unit 5 outputs the second digital signal, then the indoor unit 5 is also used to determine that the communication line based on the communication status control module 3 is communicating normally.

[0053] In this embodiment, the first difference range can be ≤2V, and the second difference range can be ≥3V. Of course, the range values ​​can be set according to the operating voltage of the main chip 1 of the wired controller. For example, when the operating voltage is 5V, the maximum value of the first difference range can be 5V, that is, the maximum absolute difference between the first differential signal and the second differential signal is ≤5V. Similarly, the maximum value of the second difference range can be set similarly. Considering voltage instability, an error value can also be set, provided that the sum or difference between the error value and the absolute difference between the first differential signal and the second differential signal does not exceed the maximum range value.

[0054] Furthermore, in this embodiment, the differential signal relationship that the indoor unit 5 can recognize is as follows: if the absolute values ​​of the first differential signal and the second differential signal meet the first difference range ≤ 2V, then the indoor unit 5 recognizes it as the first digital signal 0; if the absolute values ​​of the first differential signal and the second differential signal meet the second difference range ≥ 3V, then the indoor unit 5 recognizes it as the digital signal 1. Since the absolute values ​​of the first differential signal and the second differential signal will only satisfy one of the difference ranges, satisfying either of the above two conditions indicates that the indoor unit 5 and the wired controller main chip 1 can maintain communication based on the communication line where the communication status control module 3 is located.

[0055] Furthermore, the main chip 1 of the wired controller is typically powered by 5V, but can also be powered by 3.3V. Let's take 5V power supply as an example. When communicating based on the conduction circuit of PNP transistors Q1 and Q2, if the level of the first differential signal output from the first port is 5V and the level of the second differential signal output from the second port is 0V, or if the level of the first differential signal output from the first port is 0V and the level of the second differential signal output from the second port is 5V, and the absolute value of the difference between the two I / O port levels is ≥3V, and the indoor unit 5 recognizes it as digital signal 1, then it can be indicated that the communication line based on the communication status control module 3 is communicating normally, and the main chip 1 of the wired controller and the indoor unit 5 can continue to maintain communication based on the standby mode communication method. When the level of the first differential signal output by the first port is 5V and the level of the second differential signal output by the second port is 5V, or when the level of the first differential signal output by the first port is 0V and the level of the second differential signal output by the second port is 0V, the absolute value of the difference between the levels of the two I / O ports is ≤2V, and the indoor unit 5 recognizes it as a digital signal 0. At this time, it can also be indicated that the communication line based on the communication status control module 3 is communicating normally. The main chip 1 of the wired controller and the indoor unit 5 can continue to maintain communication based on the standby mode communication method. The indoor unit 5 can then process various instructions issued by the main chip 1 of the wired controller. Under the communication method based on the communication status control module 3, its communication baud rate and communication protocol are consistent with those of the communication chip 2 under normal working conditions.

[0056] In this embodiment, when the communication chip 2 malfunctions, the PNP transistors Q1 and Q2 are connected in the conduction circuit. A first differential signal is emitted through the first port of the main chip 1 of the wired controller, and a second differential signal is emitted through the second port. This allows the indoor unit 5 to identify the device based on the first and second differential signals. As long as the differential signal relationship that the indoor unit 5 can recognize is satisfied, the main chip 1 of the wired controller and the indoor unit 5 can still communicate even if the communication chip 2 fails. This improves the reliability of the communication method between the two devices, maintains the control function between the wired controller and the air conditioner, and enhances the user experience.

[0057] In some alternative embodiments, combined with Figure 3 As shown, the communication and power control module 4 includes a first resistor, a second resistor, a first capacitor, and a second capacitor.

[0058] The first resistor and the first capacitor are connected in series, and one end of the first resistor is connected to the emitter of the communication chip 2 and the first switching transistor. One end of the first capacitor is connected to the first interface of the indoor unit 5 through the ground wire of the power supply bus.

[0059] The second resistor and the second capacitor are connected in series. One end of the second resistor is connected to the emitter of the communication chip 2 and the second switching transistor. One end of the second capacitor is connected to the second interface of the indoor unit 5 through the power supply line of the power supply bus.

[0060] In this embodiment, the communication and power control module 4 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. The first capacitor C1 and the second capacitor C2 are non-polarized capacitors. The first resistor R1 and the second resistor R2 are matching resistors in the circuit, used to optimize communication quality; their values ​​are selected based on actual needs. The aforementioned first capacitor C1 and second capacitor C2 allow only the constantly changing communication signal to pass through, while the DC power supply on the power supply bus cannot pass through, thereby achieving DC power isolation and communication signal coupling. The DC power supply on the power supply bus is used to convert the power supply for each module.

[0061] Furthermore, the first differential signal sent by the main chip 1 of the wired controller can be coupled to the ground line connected to the indoor unit 5 as a carrier signal after being blocked by the first capacitor C1 connected in series on the ground line of the power supply bus, so as to be transmitted to the first interface of the indoor unit 5. Similarly, the second differential signal sent by the main chip 1 of the wired controller can be coupled to the power line connected to the indoor unit 5 as a carrier signal after being blocked by the second capacitor C2 connected in series on the power line of the power supply bus, so as to be transmitted to the second interface of the indoor unit 5. Communicating with the indoor unit 5 based on carrier signals allows the main chip 1 of the wired controller to maintain communication with the indoor unit 5 even if the communication chip 2 is damaged.

[0062] The capacitance values ​​of the first capacitor C1 and the second capacitor C2 can be determined according to the following formula (1):

[0063]

[0064] Among them, X C Let f be the impedance of the capacitor to the AC signal, f be the frequency of the communication signal, and C be the capacitance value.

[0065] In this embodiment, by connecting the communication and power control module 4 to the power supply bus, the communication quality can be optimized based on the first resistor R1 and the second resistor R2 in the communication and power control module 4. The constantly changing communication signal can pass through the first capacitor C1 and the second capacitor C2, while the DC power supply on the power supply bus cannot pass through. Therefore, the differential signal emitted by the main chip 1 of the wired controller can be coupled to the power supply bus and transmitted to the indoor unit 5 through the power supply bus, thereby realizing the coupling and separation of power supply and communication signal.

[0066] In some alternative embodiments, combined with Figure 4As shown, it also includes a power conversion module 6. One end of the power conversion module 6 is connected to the power supply bus, and the other end of the power conversion module 6 is connected to the wired controller main chip 1 and the communication chip 2. It is used to obtain power from the indoor unit 5 and convert it into the working power of the wired controller main chip 1 and the communication chip 2.

[0067] In this embodiment, the indoor unit 5 can be connected to 220V AC mains power, which can be converted into various low voltages required by the indoor unit 5. When the wired controller itself is not powered, the indoor unit 5 provides operating power to the wired controller's main chip 1 and communication chip 2 through the power supply bus. Therefore, by connecting one end of the power conversion module 6 to the power supply bus and the other end to the wired controller's main chip 1 and communication chip 2, the indoor unit 5 converts the converted voltage to 5V or 3.3V based on the power supply bus, which is then used by the wired controller's main chip 1 and communication chip 2, thereby enabling the wired controller to work normally. For example, it converts the 18V voltage provided by the indoor unit 1 to 5V or 3.3V.

[0068] In some optional embodiments, after the wired controller main chip 1 sends a communication signal based on the communication chip 2, the wired controller main chip 1 is also used to receive the feedback signal transmitted back by the indoor unit 5 based on the communication and power control module 4 and the communication chip 2 through the receiving end. If no feedback signal is received within a preset time, the wired controller main chip 1 determines that the communication chip is abnormal.

[0069] In some examples, communication chip 2 may experience communication abnormalities during the initial communication setup phase. However, in the initial communication mode, communication chip 2 is assumed to be functioning normally. Therefore, after the main controller chip 1 sends a communication signal through communication chip 2, it can determine whether communication chip 2 is faulty based on the feedback signal received from the indoor unit. If the indoor unit 5 receives the communication signal, it can transmit feedback signals based on the communication and power control module 4 and communication chip 2. After receiving the transmitted feedback signal, the main controller chip 1 determines that the transmission channel built based on communication chip 2 can achieve the communication function between the two. For example, the indoor unit 5 sends a digital signal 1 back to the main controller chip 1, indicating normal communication. Of course, if communication chip 2 experiences a communication abnormality during the communication process, its communication status can also be confirmed using the above method.

[0070] In other examples, if the communication signal sent by the main chip 1 of the wired controller to the indoor unit 5 does not receive a feedback signal from the indoor unit 5 within a preset time, the main chip 1 of the wired controller will determine that the communication is abnormal. At this time, the wired controller can display a fault code, indicating that it cannot control the indoor unit of the air conditioner. For example, a communication signal is sent at least once within 5 seconds, but no feedback signal is received from the indoor unit 5. By detecting the communication status, it is possible to identify whether the communication chip 2 is in a communication abnormal state, so as to determine whether the first and second switching transistors should be turned on to enable the standby mode for communication.

[0071] In some optional embodiments, a wired controller display module is also included. The wired controller display module is connected to the wired controller main chip 1 and is used for function display and to issue fault prompt information when communication is abnormal.

[0072] In this embodiment, when the main chip 1 of the wired controller does not receive a feedback signal from the indoor unit 5, it can send an instruction to the wired controller display module to display fault prompt information, so that the wired controller display module can issue fault prompt information, so that staff or users can obtain the communication status in a timely manner and facilitate timely maintenance of the communication chip.

[0073] In other examples, the wired controller display module can also be used to display other functions. Typically, the wired controller display module is equipped with six touch buttons: "Power On / Off," "+," "-," "Mode," "Function," and "Fan Speed." These functions can be displayed on the wired controller display module. However, because the differential signal sent by the main chip 1 of the wired controller is not converted by communication chip 2 when communication chip 2 malfunctions, its stability decreases. Therefore, the main chip 1 of the wired controller can not only control the display module to display fault icons, but also only the "Power On / Off" and "Mode" touch buttons are available for easy user operation. When the user presses the "Power On / Off" button, the air conditioner simultaneously turns on its built-in automatic fan speed mode. Touching the "Mode" button controls functions such as "Cooling," "Heating," "Fan," and "Dehumidification," making some functions available to the user, meeting basic user needs, and improving the user experience.

[0074] In this application embodiment, a wired controller is also provided, including the communication circuit based on the wired controller in any of the above embodiments.

[0075] In this embodiment, the wire controller, which includes a communication circuit based on the wire controller, can also implement various embodiments of the communication circuit based on the wire controller and achieve the corresponding technical effects, which will not be elaborated here.

[0076] In this embodiment of the application, an air conditioning system is also provided, the air conditioner including:

[0077] At least one indoor unit 5;

[0078] And as in the above embodiments, the wired controller, based on a communication circuit of the wired controller, communicates with the indoor unit 5.

[0079] In this embodiment, when the air conditioning system is a multi-unit air conditioning system, it may include multiple indoor units 5. Each indoor unit 5 communicates with a wired controller to achieve data interaction. Furthermore, if the communication chip 2 of the wired controller malfunctions and communication is abnormal during communication between each indoor unit 5 and the wired controller, the communication mode can be switched through the communication circuit based on the wired controller. Various embodiments of the communication circuit based on the wired controller and the corresponding technical effects can be achieved, which will not be elaborated further here.

[0080] In the embodiments of this application, the communication program corresponding to the communication circuit based on the wire controller can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.

[0081] It should be noted that in this document, relational terms such as "first," "second," etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprises a…" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. Electronic components may be connected by electrical connections.

[0082] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A communication circuit based on a wired controller, characterized in that, include: The wired controller main chip, communication chip, communication status control module, communication and power control module, and indoor unit; The main chip of the wired controller is connected to one end of the communication chip and the communication status control module. The other end of the communication status control module and the communication chip is connected to one end of the communication and power control module. The other end of the communication and power control module is connected to the indoor unit through the power supply bus. When the communication chip is communicating normally, the communication chip is used to convert the communication signal sent by the main chip of the wired controller, and to couple the signal based on the communication and power control module, so as to couple the converted communication signal to the power supply bus and output it to the indoor unit through the power supply bus; When the communication chip malfunctions, the communication status control module is used to connect the main chip of the wired controller to the communication and power control module, and transmit the communication signal sent by the main chip of the wired controller to the communication and power control module for signal coupling, so as to couple the communication signal to the power supply bus and transmit it to the indoor unit through the power supply bus.

2. The communication circuit based on a wired controller according to claim 1, characterized in that, The main chip of the wired controller includes a first port, a second port, and a third port; When the communication chip is communicating normally, the first port of the main chip of the wired controller is the receiving end, the second port of the main chip of the wired controller is the transmitting end, and the third port of the main chip of the wired controller is the enabling end. When the communication chip malfunctions, the first and second ports of the wire controller main chip become the transmitting end, and the third port of the wire controller main chip becomes the enabling end.

3. The communication circuit based on a wired controller according to claim 2, characterized in that, The communication status control module includes a first switch and a second switch; The bases of the first and second switching transistors are connected to the third port of the wire controller main chip, the collector of the first switching transistor is connected to the first port of the wire controller main chip, the collector of the second switching transistor is connected to the second port of the wire controller main chip, and the emitters of the first and second switching transistors are connected to the communication and power control module.

4. The communication circuit based on a wired controller according to claim 3, characterized in that, When the communication chip malfunctions, the first port of the main chip of the wire controller is used to output a first differential signal to the collector of the first switching transistor, the second port of the main chip of the wire controller is used to output a second differential signal to the collector of the second switching transistor, and the third port of the main chip of the wire controller is used to output a high-level signal to the base of the first switching transistor and the second switching transistor. The internal unit is used to receive the first differential signal and the second differential signal and calculate the difference, and identify whether the difference conforms to the first difference range or the second difference range; If the difference meets the first difference range and the indoor unit outputs a first digital signal, or if the difference meets the second difference range and the indoor unit outputs a second digital signal, then the indoor unit is also used to determine that the communication line based on the communication status control module is communicating normally.

5. The communication circuit based on a wired controller according to claim 3, characterized in that, The communication and power control module includes a first resistor, a second resistor, a first capacitor, and a second capacitor; The first resistor and the first capacitor are connected in series, and one end of the first resistor is connected to the communication chip and the emitter of the first switching transistor. One end of the first capacitor is connected to the first interface of the indoor unit through the ground wire of the power supply bus. The second resistor and the second capacitor are connected in series, and one end of the second resistor is connected to the communication chip and the emitter of the second switching transistor. One end of the second capacitor is connected to the second interface of the indoor unit through the power supply line of the power supply bus.

6. The communication circuit based on a wired controller according to claim 1, characterized in that, It also includes a power conversion module, one end of which is connected to the power supply bus, and the other end of which is connected to the wired controller main chip and the communication chip, for converting power obtained from the indoor unit into the working power of the wired controller main chip and the communication chip.

7. The communication circuit based on a wired controller according to claim 2, characterized in that, After the main chip of the wired controller sends a communication signal based on the communication chip, the main chip of the wired controller is also used to receive the feedback signal transmitted back by the indoor unit based on the communication and power control module and the communication chip through the receiving end. If the feedback signal is not received within a preset time, the main chip of the wired controller determines that the communication chip is abnormal.

8. The communication circuit based on a wired controller according to claim 7, characterized in that, It also includes a wired controller display module, which is connected to the main chip of the wired controller. The wired controller display module is used for function display and to issue fault prompt information when communication is abnormal.

9. A wired controller, characterized in that, Includes a wire-controlled communication circuit as described in any one of claims 1 to 8.

10. An air conditioning system, characterized in that, The air conditioning system includes: At least one internal unit; And a wired controller as described in claim 9, wherein the wired controller communicates with the indoor unit based on the wired controller-based communication circuit.

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