Communication system for air conditioner and air conditioner

Abstract

The invention provides a communication system for an air conditioner and the air conditioner. The system comprises a first main control circuit, a second main control circuit, a power supply circuit and a communication line, the power supply circuit is connected with the first main control circuit, and the power supply circuit and the first main control circuit are respectively connected with the second main control circuit through communication lines; after a carrier signal of the first main control circuit and a power signal of the power supply circuit are loaded, the carrier signal and the power signal are transmitted to the second main control circuit through a communication line, so that communication between the first main control circuit and the second main control circuit is realized, and the power supply circuit supplies power to the second main control circuit; a carrier signal of the second main control circuit is transmitted to the first main control circuit through a communication line so as to realize communication between the second main control circuit and the first main control circuit. According to the communication system for the air conditioner and the air conditioner provided by the invention, the power supply signal is loaded through the communication line, so that the communication signal can be transmitted through one wire rod, and meanwhile, the power supply signal can also be transmitted.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliances, and in particular to a communication system for an air conditioner and the air conditioner. Background Art

[0002] At present, the communication interfaces of HVAC system equipment are generally traditional 485 communication, CAN communication, and HBS communication. Traditional communication systems require separate wiring of communication lines and power lines. For example, at least four wires are required to transmit signals and power at the same time: two wires are used for differential signal transmission, and the other two are used for power transmission and grounding. The weight and cost of these long cables will increase the complexity and installation cost of the system; and if multiple wires are connected incorrectly, it may also cause system failure, further increasing the complexity of the system. Summary of the invention

[0003] The present invention provides a communication system and an air conditioner for an air conditioner, which are used to solve the problem that the communication of the existing HVAC system requires separate wiring of communication lines and power lines, and the output interface needs to be cascaded according to a specified line sequence, which may cause communication abnormalities due to wrong connection.

[0004] According to a first aspect of the present invention, a communication system for an air conditioner is provided, comprising: a first main control circuit, a second main control circuit, a power supply circuit and a communication line; the power supply circuit is connected to the first main control circuit, and the power supply circuit and the first main control circuit are respectively connected to the second main control circuit through the communication line; after the carrier signal of the first main control circuit and the power signal of the power supply circuit are loaded, they are transmitted to the second main control circuit through the communication line to realize communication between the first main control circuit and the second main control circuit, and power supply from the power supply circuit to the second main control circuit; the carrier signal of the second main control circuit is transmitted to the first main control circuit through the communication line to realize communication between the second main control circuit and the first main control circuit.

[0005] According to one embodiment of the present invention, it also includes: a first conversion circuit; the first conversion circuit is connected to the first main control circuit, and is connected to the second main control circuit through the communication line to achieve communication between the first main control circuit and the second main control circuit; the power supply circuit is connected to the first conversion circuit, used to supply power to the first conversion circuit, and is connected to the communication line together with the first conversion circuit.

[0006] Specifically, this embodiment provides an implementation of a first conversion circuit.

[0007] According to an embodiment of the present invention, it further includes: a first isolation circuit, wherein the first isolation circuit is connected to the power supply circuit and the communication line respectively.

[0008] Specifically, this embodiment provides an implementation of a first isolation circuit.

[0009] According to one embodiment of the present invention, it also includes: a first DC blocking capacitor, which is arranged on the side of the communication line close to the first conversion circuit, and is used to load the carrier signal to the communication line and prevent the power supply signal from entering the first conversion circuit.

[0010] Specifically, this embodiment provides an implementation of a first DC blocking capacitor.

[0011] According to one embodiment of the present invention, it further includes: a second isolation circuit, which is connected to the communication line and the second main control circuit respectively and is used to isolate the carrier signal and the power supply signal on the communication line.

[0012] Specifically, this embodiment provides an implementation of a second isolation circuit.

[0013] According to one embodiment of the present invention, it also includes: a retrieval circuit, which is connected to the second isolation circuit and is used to transmit the power signal isolated by the second isolation circuit to the power-consuming device, so as to realize the power supply circuit to the power-consuming device.

[0014] Specifically, this embodiment provides an implementation of a retrieval circuit.

[0015] According to one embodiment of the present invention, it also includes: a second conversion circuit; the second conversion circuit is connected to the second isolation circuit and the second main control circuit respectively to realize communication between the first main control circuit and the second main control circuit; the retrieval circuit is connected to the second conversion circuit for supplying power to the second conversion circuit.

[0016] Specifically, this embodiment provides an implementation of a second conversion circuit.

[0017] According to one embodiment of the present invention, it also includes: a switching device and multiple resistors; the multiple resistors are arranged in parallel; the second conversion circuit, the switching device and the multiple resistors after parallel connection are arranged in series; wherein the switching device switches between the multiple resistors to adjust the carrier frequency between the second conversion circuit and the second main control circuit.

[0018] Specifically, this embodiment provides an implementation of a switch device and a plurality of resistors.

[0019] According to one embodiment of the present invention, it also includes: a second DC blocking capacitor, which is arranged on the side of the communication line close to the second conversion circuit, and is used to load the carrier signal to the communication line and block the power supply signal from entering the second conversion circuit.

[0020] Specifically, this embodiment provides an implementation of a second DC blocking capacitor.

[0021] According to a second aspect of the present invention, an air conditioner is provided, comprising the above-mentioned communication system for an air conditioner.

[0022] The above one or more technical solutions in the present invention have at least one of the following technical effects: a communication system and an air conditioner for an air conditioner provided by the present invention load a power signal through a communication line, thereby realizing the transmission of communication signals through one wire, and can also transmit power signals at the same time, and the communication interface is not polarity-specific, and matching resistors do not need to be added at the remote end. When CAN is used for transmission, there is no need to distinguish the polarity connections of CANH and CANL, so transmission is more convenient and implementation is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is one of the layout schematic diagrams of the communication system for air conditioner provided by the present invention;

[0025] Figure 2 This is the second schematic diagram of the arrangement of the communication system for the air conditioner provided by the present invention;

[0026] Figure 3 This is the third layout diagram of the communication system for the air conditioner provided by the present invention.

[0027] Reference numerals:

[0028] 10. First main control circuit; 20. Second main control circuit; 30. Power supply circuit; 40. Communication line; 50. First conversion circuit; 60. First DC blocking capacitor; 70. First isolation circuit; 80. Second isolation circuit; 90. Retrieval circuit; 100. Second conversion circuit; 101. Switching device; 102. Resistor; 110. Second DC blocking capacitor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention is described in detail below in conjunction with the accompanying drawings of the specification. The specific operating method in the method embodiment can also be applied to the device embodiment or the system embodiment. In the description of the present invention, unless otherwise specified, "at least one" includes one or more. "Multiple" refers to two or more. For example, at least one of A, B and C includes: A exists alone, B exists alone, A and B exist at the same time, A and C exist at the same time, B and C exist at the same time, and A, B and C exist at the same time. In the present invention, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a kind of association relationship that describes the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0031] The present invention will be described in detail below in conjunction with specific implementation modes.

[0032] In some specific embodiments of the present invention, Figures 1 to 3 As shown, the present solution provides a communication system for an air conditioner, comprising: a first main control circuit 10, a second main control circuit 20, a power supply circuit 30 and a communication line 40; the power supply circuit 30 is connected to the first main control circuit 10, and the power supply circuit 30 and the first main control circuit 10 are respectively connected to the second main control circuit 20 through the communication line 40; after the carrier signal of the first main control circuit 10 and the power signal of the power supply circuit 30 are loaded, they are transmitted to the second main control circuit 20 through the communication line 40 to realize the communication between the first main control circuit 10 and the second main control circuit 20, and the power supply circuit 30 supplies power to the second main control circuit 20; the carrier signal of the second main control circuit 20 is transmitted to the first main control circuit 10 through the communication line 40 to realize the communication between the second main control circuit 20 and the first main control circuit 10.

[0033] In a possible embodiment, the traditional 485 communication, CAN communication, and HBS communication cannot support dual-use of one line and the communication interface distinguishes polarity. Based on the current communication limitations, the present invention provides a new communication solution based on RS485 communication, which can realize power line carrier while using the power line carrier dedicated chip as the main chip to develop and design hardware circuits to realize a low-voltage DC carrier communication solution based on the 485 interface.

[0034] In a possible embodiment, the power supply circuit 30 provides a DC power supply or an AC power supply.

[0035] In a possible embodiment, the power supply circuit 30 provides a 24V DC power supply.

[0036] In a possible embodiment, the first main control circuit 10 and the second main control circuit 20 include at least a microprocessor 810 and peripheral circuits related to the microprocessor 810 so that the microprocessor 810 can operate normally. Compared with the prior art, the present invention does not require software support.

[0037] In a possible embodiment, the present invention provides a new communication solution based on CAN communication, that is, as long as it is a two-wire communication interface, it can be modified accordingly according to the system of the present invention to achieve compatible transmission of power supply and communication interface.

[0038] In a possible embodiment, the present invention is a new communication solution based on HBS communication, that is, any two-wire communication interface can be modified accordingly according to the system of the present invention to achieve compatible transmission of power supply and communication interface.

[0039] In a possible embodiment, the present invention provides a new communication solution based on RS232 communication, that is, as long as it is a two-wire communication interface, it can be modified accordingly according to the system of the present invention to achieve compatible transmission of power supply and communication interface.

[0040] In some possible implementations of the present invention, it also includes: a first conversion circuit 50; the first conversion circuit 50 is connected to the first main control circuit 10, and is connected to the second main control circuit 20 through a communication line 40 to achieve communication between the first main control circuit 10 and the second main control circuit 20; the power supply circuit 30 is connected to the first conversion circuit 50, for supplying power to the first conversion circuit 50, and is connected to the communication line 40 together with the first conversion circuit 50.

[0041] Specifically, this embodiment provides an implementation method of a first conversion circuit 50. By setting the first conversion circuit 50, communication between the first main control circuit 10 and the second main control circuit 20 is achieved. The first conversion circuit 50 converts the TTL level signal sent by the first main control circuit 10 into a carrier signal.

[0042] It should be noted that the digital communication signals sent by the existing main control circuit are generally UART, IIC, and SPI signals at TTL level, which are generally 3.3V or 5V. After the digital signal passes through the conversion circuit, the traditional 485 conversion chip can convert it into a 485 standard level, namely, an AB check signal.

[0043] In a possible embodiment, the first conversion circuit 50 of the present invention can realize carrier modulation according to the input logic level. When the input is logic 0, the first conversion circuit 50 outputs a carrier signal of a specified frequency. When the input is logic 1, it outputs a zero signal. The carrier signal adopts OOK modulation. The modulated carrier signal is loaded with the DC power signal of the power supply circuit 30 and output to the communication line 40, thereby realizing that there are both a DC power signal and a carrier signal on the communication line 40.

[0044] In a possible embodiment, the first conversion circuit 50 is a circuit arrangement that uses a conversion chip as a main component and cooperates with peripheral circuits to enable the conversion chip to work normally. Compared with the prior art, the present invention does not require software support.

[0045] In some possible implementations of the present invention, the present invention further includes: a first isolation circuit 70 , and the first isolation circuit 70 is connected to the power supply circuit 30 and the communication line 40 respectively.

[0046] Specifically, this embodiment provides an implementation of a first isolation circuit 70. The configuration of the first isolation circuit 70 can prevent the carrier signal on the communication twisted pair from being absorbed by the DC power supply-related circuit, causing communication abnormality.

[0047] In a possible embodiment, the first isolation circuit 70 at least includes a low-pass filter or an LC filter or other device for isolating the communication signal from entering the power supply circuit 30 .

[0048] In some possible implementations of the present invention, it also includes: a first DC blocking capacitor 60, which is arranged on the side of the communication line 40 close to the first conversion circuit 50, for loading the carrier signal to the communication line 40 and preventing the power signal from entering the first conversion circuit 50.

[0049] Specifically, this embodiment provides an implementation of a first DC blocking capacitor 60. By setting the first DC blocking capacitor 60, when the second main control circuit 20 sends communication information to the first main control circuit 10, the carrier signal is extracted, and the power signal on the communication line 40 is prevented from being injected into the first conversion circuit 50, causing irreversible damage.

[0050] In some possible implementations of the present invention, the second isolation circuit 80 is further included. The second isolation circuit 80 is connected to the communication line 40 and the second main control circuit 20 respectively, and is used to isolate the carrier signal and the power signal on the communication line 40.

[0051] Specifically, this embodiment provides an implementation of a second isolation circuit 80 , and after being transmitted to a remote end via a communication line 40 , the power supply and the carrier signal are isolated by the isolation function of the second isolation circuit 80 .

[0052] Furthermore, when the second main control circuit 20 sends information to the first main control circuit 10 , the second isolation circuit 80 also loads the carrier signal onto the communication line 40 , while preventing the power signal on the communication line 40 from directly entering the second conversion circuit 100 .

[0053] In a possible embodiment, the demodulation method generally uses a non-coherent demodulation method, so as to achieve mutual communication between the first main control circuit 10 and the second main control circuit 20 .

[0054] In a possible embodiment, the first isolation circuit 70 at least includes components such as a low-pass filter or an LC filter.

[0055] In some possible implementations of the present invention, it also includes: a retrieval circuit 90, which is connected to the second isolation circuit 80 and is used to transmit the power signal isolated by the second isolation circuit 80 to the power-consuming device, so as to realize the power supply of the power supply circuit 30 to the power-consuming device.

[0056] Specifically, this embodiment provides an implementation method of a retrieval circuit 90. The retrieval circuit 90 is configured to retrieve the power supply and carrier signal isolated by the first isolation circuit 70, and then power the second main control circuit 20 through the retrieval circuit 90, as well as power the electrical equipment connected to the retrieval circuit 90.

[0057] It should be noted that after demodulation by the second isolation circuit 80, the mutual communication between the first main control circuit 10 and the second main control circuit 20 is realized. At the same time, the power supply circuit 30 at the first main control circuit 10 end can provide circuits for the remote third main control circuit and related circuits, thereby realizing the relevant communication between the air-conditioning system communication equipment. The power supply of the retrieval circuit 90 can provide energy for the valve body or relay of the air-conditioning system equipment to complete the corresponding command operation.

[0058] In some possible implementations of the present invention, it also includes: a second conversion circuit 100; the second conversion circuit 100 is connected to the second isolation circuit 80 and the second main control circuit 20 respectively to achieve communication between the first main control circuit 10 and the second main control circuit 20; the retrieval circuit 90 is connected to the second conversion circuit 100 for supplying power to the second conversion circuit 100.

[0059] Specifically, this embodiment provides an implementation of a second conversion circuit 100, which converts the carrier signal isolated by the second isolation circuit 80 into a TTL level signal and sends it to the second main control circuit 20, thereby realizing communication between the first main control circuit 10 and the second main control circuit 20.

[0060] Similarly, when the second main control circuit 20 sends a signal to the first main control circuit 10, the communication between the second main control circuit 20 and the second conversion circuit 100 is a TTL-level serial communication signal. The second conversion circuit 100 converts the TTL-level signal into a carrier signal and transmits it to the first conversion circuit 50 through the communication line 40. The first conversion circuit 50 converts the carrier signal into a TTL-level signal and sends it to the first main control circuit 10, thereby realizing communication between the second main control circuit 20 and the first main control circuit 10.

[0061] In a possible embodiment, the second conversion circuit 100 is a circuit arrangement that uses a conversion chip as a main component and cooperates with peripheral circuits to enable the conversion chip to work normally. Compared with the prior art, the present invention does not require software support.

[0062] In some possible implementations of the present invention, it also includes: a switching device 101 and multiple resistors 102; the multiple resistors 102 are arranged in parallel; the second conversion circuit 100, the switching device 101 and the multiple resistors 102 connected in parallel are arranged in series; wherein the switching device 101 switches between the multiple resistors 102 to adjust the carrier frequency between the second conversion circuit 100 and the second main control circuit 20.

[0063] Specifically, this embodiment provides an implementation method of a switching device 101 and multiple resistors 102. Through the setting of the switching device 101 and multiple resistors 102, the function of adjusting the communication frequency is realized through the second conversion circuit 100. When the bit error rate reaches a certain threshold, the communication frequency will be switched, thereby effectively and timely performing dynamic adjustments to improve the communication stability and reliability of the system.

[0064] Furthermore, the communication system of the present invention does not need to use shielded wires to transmit signals. Since the frequency of the communication signal can be effectively adjusted, only ordinary twisted pair wires are required for transmission.

[0065] It should be noted that existing traditional communication systems all use fixed frequency transmission. When the frequency of the external interference signal is consistent with it, it will cause long-term abnormality in the system communication and cannot be restored. Therefore, the communication line 40 used in the traditional communication system often uses a shielded line, which greatly increases the cost, and the shielded line needs to be connected to the ground, which is inconvenient for engineering implementation.

[0066] It can be understood that the communication system of the present invention can dynamically adjust the system in advance based on the communication bit error rate value so that the carrier frequency of the communication signal is far away from the external interference frequency in the frequency domain, thereby improving the reliability of communication.

[0067] In addition, the communication system of the present invention detects the communication quality. The OOK carrier on the bus performs carrier communication at a fixed frequency. When the interference frequency of the communication environment is consistent with the fixed frequency, communication abnormalities will occur. Therefore, the OOK carrier frequency can be effectively adjusted according to the communication system, and then the frequency of the communication signal can be adjusted to ensure the reliability of communication. Shielded wires may not be used, thereby reducing costs.

[0068] In a possible embodiment, if Figure 3 As shown, when the communication bit error rate continues to increase within a certain period of time and reaches a certain threshold, the second main control circuit 20 communicates with the second conversion circuit 100 to make its output control pin (Control Pin) switch the switch device 101, and adjust the pull-down resistor 102 of its R_SET pin, such as Figure 3 As shown, R_SET is pulled down to resistor 102 with different resistance values ​​through switch device 101. Different R_SET will change the carrier frequency of the bus output OOK signal, thereby effectively avoiding the external interference signal frequency, which can effectively improve the communication stability and reliability of the system and avoid communication abnormalities causing system instability.

[0069] In a possible embodiment, R_SET can match multiple frequencies according to actual conditions.

[0070] In some possible implementations of the present invention, it also includes: a second DC blocking capacitor 110, which is arranged on the side of the communication line 40 close to the second conversion circuit 100, for loading the carrier signal to the communication line 40 and blocking the power signal from entering the second conversion circuit 100.

[0071] In some specific embodiments of the present invention, the present solution provides an air conditioner, comprising the above-mentioned communication system for the air conditioner.

[0072] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0073] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A communication system for an air conditioner, It is characterized in that include: A first main control circuit (10), a second main control circuit (20), a power supply circuit (30) and a communication line (40); The power supply circuit (30) is connected to the first main control circuit (10), and the power supply circuit (30) and the first main control circuit (10) are respectively connected to the second main control circuit (20) via the communication line (40); After the carrier signal of the first main control circuit (10) and the power signal of the power supply circuit (30) are loaded, they are transmitted to the second main control circuit (20) through the communication line (40) to realize communication between the first main control circuit (10) and the second main control circuit (20), and the power supply circuit (30) supplies power to the second main control circuit (20); The carrier signal of the second main control circuit (20) is transmitted to the first main control circuit (10) via the communication line (40) to achieve communication between the second main control circuit (20) and the first main control circuit (10).

2. The communication system for an air conditioner according to claim 1, It is characterized in that Also includes: A first conversion circuit (50); The first conversion circuit (50) is connected to the first main control circuit (10), and is connected to the second main control circuit (20) via the communication line (40), so as to realize communication between the first main control circuit (10) and the second main control circuit (20); The power supply circuit (30) is connected to the first conversion circuit (50) and is used to supply power to the first conversion circuit (50), and is connected to the communication line (40) together with the first conversion circuit (50).

3. The communication system for an air conditioner according to claim 2, It is characterized in that Also includes: A first isolation circuit (70), wherein the first isolation circuit (70) is connected to the power supply circuit (30) and the communication line (40) respectively.

4. The communication system for an air conditioner according to claim 3, It is characterized in that Also includes: A first DC blocking capacitor (60) is arranged on a side of the communication line (40) close to the first conversion circuit (50) and is used to load the carrier signal onto the communication line (40) and prevent the power supply signal from entering the first conversion circuit (50).

5. The communication system for an air conditioner according to any one of claims 1 to 4, It is characterized in that Also includes: A second isolation circuit (80), the second isolation circuit (80) is connected to the communication line (40) and the second main control circuit (20) respectively, and is used to isolate the carrier signal and the power signal on the communication line (40).

6. The communication system for an air conditioner according to claim 5, It is characterized in that Also includes: A retrieval circuit (90), the retrieval circuit (90) being connected to the second isolation circuit (80) and used for transmitting the power signal isolated by the second isolation circuit (80) to the power-consuming device, so as to enable the power supply circuit (30) to supply power to the power-consuming device.

7. The communication system for an air conditioner according to claim 6, It is characterized in that Also includes: A second conversion circuit (100); The second conversion circuit (100) is connected to the second isolation circuit (80) and the second main control circuit (20) respectively, so as to realize communication between the first main control circuit (10) and the second main control circuit (20); The retrieval circuit (90) is connected to the second conversion circuit (100) and is used to supply power to the second conversion circuit (100).

8. The communication system for an air conditioner according to claim 7, It is characterized in that Also includes: A switching device (101) and a plurality of resistors (102); A plurality of resistors (102) are arranged in parallel; The second conversion circuit (100), the switch device (101) and the plurality of resistors (102) connected in parallel are arranged in series; The switch device (101) switches between the plurality of resistors (102) to adjust the carrier frequency between the second conversion circuit (100) and the second main control circuit (20).

9. The communication system for an air conditioner according to claim 7, It is characterized in that Also includes: A second DC blocking capacitor (110), the second DC blocking capacitor (110) is arranged on a side of the communication line (40) close to the second conversion circuit (100), and is used to load the carrier signal to the communication line (40) and block the power supply signal from entering the second conversion circuit (100).

10. An air conditioner, It is characterized in that A communication system for an air conditioner comprising any one of claims 1 to 9.

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