Outdoor unit monitoring circuit, circuit board and equipment

Abstract

The utility model discloses an outdoor unit monitoring circuit, a circuit board and equipment, the outdoor unit monitoring circuit is connected with an air conditioner outdoor unit and a monitoring terminal, and the outdoor unit monitoring circuit comprises a first connection interface, a second connection interface, a first isolation module, a protection module and an interface conversion module; the first connection interface is used for being connected with a monitoring terminal, the second connection interface is used for being connected with an air conditioner outdoor unit, and the first isolation module is used for isolating the signal level of a communication signal between the monitoring terminal and the air conditioner outdoor unit; the protection module performs electrostatic protection on the first connection interface; and the interface conversion module is used for converting a first signal input by the protection module through the first connection interface, outputting the converted first signal through the second connection interface by the first isolation module, converting a second signal input by the second connection interface, and outputting the converted second signal through the first connection interface by the protection module. According to the application, direct communication between the monitoring terminal and the outdoor unit of the air conditioner can be realized so as to monitor the outdoor unit of the air conditioner, and the cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to an outdoor unit monitoring circuit, circuit board, and device. Background Technology

[0002] During the development of variable frequency air conditioners, it is necessary to monitor the operating status of the air conditioner in real time to obtain information such as compressor frequency, indoor and outdoor fan speeds, indoor ambient temperature, and outdoor ambient temperature. Currently, monitoring methods include... Figure 1 As shown, after the information from the indoor and outdoor units is sent to the indoor unit, the indoor unit sends it to the monitoring terminal. The monitoring terminal (such as an APP) monitors the overall operation information of the unit. However, the indoor unit needs to have WIFI function and need to be connected to the Internet, which is costly. Moreover, it cannot directly control the outdoor unit, making it inconvenient to use. Utility Model Content

[0003] This application provides an outdoor unit monitoring circuit, circuit board, and device that can reduce costs and directly control the outdoor unit of the air conditioner, making it convenient to use.

[0004] This application provides an outdoor unit monitoring circuit, which is connected to both the outdoor unit of the air conditioner and a monitoring terminal. The outdoor unit monitoring circuit includes:

[0005] The first connection interface is used to connect to the monitoring terminal.

[0006] The second connection interface is used to connect to the outdoor unit of the air conditioner.

[0007] The first isolation module is connected to the second connection interface. The first isolation module is used to isolate the signal level of the communication signal between the monitoring terminal and the outdoor unit of the air conditioner.

[0008] A protection module is connected to the first connection interface and is used to provide electrostatic protection for the first connection interface.

[0009] The interface conversion module is connected to the first isolation module and the protection module respectively. The interface conversion module is used to convert the first signal input through the protection module via the first connection interface and output it through the second connection interface via the first isolation module, and to convert the second signal input through the second connection interface and output it through the first connection interface via the protection module.

[0010] In some embodiments of the outdoor unit monitoring circuit, the outdoor unit monitoring circuit further includes a second isolation module, which is connected to the interface conversion module and the second connection interface.

[0011] The interface conversion module is also used to output the corresponding status detection signal through the second isolation module via the second connection interface when the monitoring terminal is connected to the first connection interface;

[0012] The second isolation module is used to isolate the signal level of the status detection signal between the monitoring terminal and the outdoor unit of the air conditioner.

[0013] In some embodiments of the outdoor unit monitoring circuit, the interface conversion module includes a signal conversion chip, the first signal transmission terminal of the signal conversion chip is connected to the first isolation module, and the second signal transmission terminal of the signal conversion chip is connected to the protection module.

[0014] The signal detection terminal of the signal conversion chip is connected to the second isolation module.

[0015] In some embodiments of the outdoor unit monitoring circuit, the protection module includes a protection chip, a first signal connection terminal of the protection chip is connected to a first connection interface, and a second signal connection terminal of the protection chip is connected to a second signal transmission terminal of a signal conversion chip.

[0016] In some embodiments of the outdoor unit monitoring circuit, the first isolation module includes an isolation chip, the first signal isolation terminal of the isolation chip is connected to the first signal transmission terminal of the signal conversion chip, and the second signal isolation terminal of the isolation chip is connected to the second connection interface.

[0017] In some embodiments of the outdoor unit monitoring circuit, the second isolation module includes an optocoupler. The first pin of the optocoupler is connected to the signal detection terminal of the signal conversion chip, the second pin of the optocoupler is grounded, the third pin of the optocoupler is grounded, and the fourth pin of the optocoupler is connected to the second connection interface.

[0018] In some embodiments, the outdoor unit monitoring circuit further includes a third connection interface, which is connected in parallel with the second connection interface and is used to connect to the outdoor unit of the air conditioner.

[0019] In some embodiments of the outdoor unit monitoring circuit, the third connection interface includes:

[0020] The switching transistor has its first terminal connected to the second signal isolation terminal of the isolation chip; its second terminal is energized, and its third terminal is grounded.

[0021] The first connecting terminal is used to connect to the outdoor unit of the air conditioner;

[0022] The first level conversion chip has its RD signal terminal connected to the second signal isolation terminal of the isolation chip, its RE / DE signal terminal connected to the collector of the switching transistor, and its A and B signal terminals connected to the first connection terminal.

[0023] This application embodiment also provides a circuit board on which the above-mentioned outdoor unit monitoring circuit is integrated.

[0024] This application also provides an air conditioner outdoor unit monitoring device, which includes the outdoor unit monitoring circuit described above.

[0025] This application provides an outdoor unit monitoring circuit, circuit board, and device. In this embodiment, the outdoor unit monitoring circuit is directly connected to the monitoring terminal via a first connection interface and to the air conditioner outdoor unit via a second connection interface. This enables direct communication between the monitoring terminal and the air conditioner outdoor unit, thereby completing the monitoring of the outdoor unit. Therefore, the indoor unit does not need to have Wi-Fi functionality or be connected to the internet, saving costs. Simultaneously, a protection module is provided between the first connection interface and the interface conversion module to provide electrostatic protection for the first connection interface, improving the safety of the outdoor unit monitoring circuit. Attached Figure Description

[0026] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the existing monitoring structure for outdoor air conditioning units.

[0028] Figure 2 This is a schematic diagram showing the connection between the outdoor unit monitoring circuit, the air conditioner outdoor unit, and the monitoring terminal provided in an embodiment of this application.

[0029] Figure 3 This is a first structural block diagram of the outdoor unit monitoring circuit provided in an embodiment of this application.

[0030] Figure 4 This is a second structural block diagram of the outdoor unit monitoring circuit provided in an embodiment of this application.

[0031] Figure 5 The circuit structure diagram of the outdoor unit monitoring circuit provided in the embodiment of this application is shown. Detailed Implementation

[0032] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0034] Please see Figure 2 This embodiment provides an outdoor unit monitoring circuit 10, which is connected to the air conditioner outdoor unit 20 and the monitoring terminal 30 respectively. Specifically, the outdoor unit monitoring circuit 10 is connected between the monitoring terminal 30 and the air conditioner outdoor unit 20, and establishes communication connections with the air conditioner outdoor unit 20 and the monitoring terminal 30 respectively.

[0035] Please see Figure 3 The outdoor unit monitoring circuit 10 includes a first connection interface 11, a second connection interface 12, a first isolation module 13, a protection module 14, and an interface conversion module 15; the first connection interface 11 is connected to the interface conversion module 15 through the protection module 14, and the interface conversion module 15 is connected to the second connection interface 12 through the first isolation module 13.

[0036] In this embodiment, the first connection interface 11 is used to connect to the monitoring terminal 30, the second connection interface 12 is used to connect to the outdoor unit 20 of the air conditioner, the first isolation module 13 is connected to the second connection interface 12, and the first isolation module 13 is used to isolate the signal level of the communication signal between the monitoring terminal 30 and the outdoor unit 20 of the air conditioner; the interface conversion module 15 is connected to the first isolation module 13 and the protection module 14 respectively, and the interface conversion module 15 is used to convert the first signal input through the first connection interface 11 and the protection module 14, and output it through the first isolation module 13 and the second connection interface 12, and convert the second signal input through the second connection interface 12, and output it through the protection module 14 and the first connection interface 11; the protection module 14 is connected to the first connection interface 11, and the protection module 14 is used to perform overcurrent protection on the first connection interface 11.

[0037] In this embodiment, the first connection interface 11 is directly connected to the monitoring terminal 30, and the second connection interface 12 is connected to the outdoor unit 20 of the air conditioner. This enables direct communication between the monitoring terminal 30 and the outdoor unit 20, thereby completing the monitoring of the outdoor unit 20. Therefore, the indoor unit does not need to have Wi-Fi functionality or be connected to the internet, saving costs. Simultaneously, a protection module 14 is provided between the first connection interface 11 and the interface conversion module 15 to provide electrostatic protection for the first connection interface 11, which improves the safety of the outdoor unit monitoring circuit 10.

[0038] Please see Figure 4In some embodiments, the outdoor unit monitoring circuit 10 further includes a second isolation module 16, which is connected to the interface conversion module 15 and the second connection interface 12. The interface conversion module 15 is also used to output a corresponding status detection signal through the second isolation module 16 and the second connection interface 12 when the monitoring terminal 30 is connected to the first connection interface 11. The second isolation module 16 is used to isolate the signal level of the status detection signal between the monitoring terminal 30 and the air conditioner outdoor unit 20.

[0039] The outdoor unit monitoring circuit 10 can be connected to the main board of the outdoor unit 20 via the second connection interface 12. When the outdoor unit monitoring circuit 10 is connected to the monitoring terminal 30 via the first connection interface 11, the interface conversion module 15 outputs a status detection signal to the main board. The main board enables the signal transmission channel based on this status detection signal, establishing a communication connection with the monitoring equipment. The second isolation module 16 isolates the transmission path of the status detection signal from the outdoor unit 20, effectively protecting the interface conversion module 15 and thus improving the safety and reliability of the outdoor unit monitoring circuit 10.

[0040] Please refer to the following: Figure 5 In some embodiments, the interface conversion module 15 includes a signal conversion chip U1. The first signal transmission terminal of the signal conversion chip U1 (TXD signal terminal and RXD signal terminal in this embodiment) is connected to the first isolation module 13. The second signal transmission terminal of the signal conversion chip U1 (D- signal terminal and D+ signal terminal in this embodiment) is connected to the protection module 14. The signal detection terminal of the signal conversion chip U1 (Suspend signal terminal in this embodiment) is connected to the second isolation module 16.

[0041] In this embodiment, the signal conversion chip U1 can be a CP2102N. This signal conversion chip U1 can convert USB to a serial UART interface and has excellent stability. Furthermore, this signal conversion chip U1 requires very few external components; it only needs a power supply decoupling capacitor and a reset resistor to operate, completely eliminating the need for USB bus matching and identification circuits, crystal oscillators, and LDOs, as these are all fully integrated into the signal conversion chip U1. Its internal clock reaches 48MHz, thus enabling a maximum baud rate of 3Mbps. The built-in 3.3V LDO has an output capability of up to 100mA, providing power not only to itself but also to other peripherals such as the isolation chip U3.

[0042] When the first connection interface 11 is connected to the monitoring terminal 30, the signal conversion chip U1 outputs a status detection signal, such as a high-level signal, through the signal detection terminal. The outdoor unit 20 of the air conditioner can open the corresponding communication channel according to the high-level signal, without having to keep the terminal open or check and wait, so as to achieve the effect of energy saving.

[0043] In some embodiments, the protection module 14 includes a protection chip U2. The first signal connection terminal of the protection chip U2 is connected to the first connection interface 11, and the second signal connection terminal of the protection chip U2 is connected to the second signal transmission terminal of the signal conversion chip U1. The protection chip U2 may be a USBLC6-2P6. The protection chip U2 provides electrostatic protection for the first connection interface 11, ensuring the safety of the first connection interface 11.

[0044] In some embodiments, the first isolation module 13 includes an isolation chip U3, the first signal isolation terminal of the isolation chip U3 (in this embodiment, the VIA signal terminal and the VOB signal terminal are connected) is connected to the first signal transmission terminal of the signal conversion chip U1, and the second signal isolation terminal of the isolation chip U3 (in this embodiment, the VOA signal terminal and the VIB signal terminal) is connected to the second connection interface 12.

[0045] In this embodiment, the isolation chip U3 can be of model Si8421AD-B-IS; the isolation chip U3 is a bidirectional magnetic isolation chip U3, which can provide signal isolation function to prevent the strong electrical signal of the air conditioner outdoor unit from being introduced into the monitoring equipment such as the computer and burning out the computer.

[0046] In some embodiments, the second isolation module 16 includes an optocoupler U4. Pin 1 of the optocoupler U4 is connected to the signal detection terminal of the signal conversion chip U1, pin 2 of the optocoupler U4 is grounded, pin 3 of the optocoupler U4 is grounded, and pin 4 of the optocoupler U4 is connected to the second connection interface 12. When the signal detection port of the signal conversion chip U1 outputs a high-level signal, the optocoupler U4 is turned on to provide a corresponding level signal to the outdoor unit 20 of the air conditioner, so that the outdoor unit 20 can open the corresponding communication channel according to the level signal.

[0047] Please continue reading. Figure 4 In some embodiments, the outdoor unit monitoring circuit 10 further includes a third connection interface 17, which is connected in parallel with the second connection interface 12. The third connection interface 17 is used to connect to the outdoor unit 20 of the air conditioner. In this embodiment, the third connection interface 17 includes a first connection terminal CN1, a first level conversion chip U5, and a switching transistor Q1. The first end of the switching transistor Q1 is connected to the VIB signal terminal of the isolation chip U3; the collector of the switching transistor Q1 is energized; the first connection terminal CN1 is used to connect to the outdoor unit 20 of the air conditioner; the RD signal terminal of the first level conversion chip U5 is connected to the second signal isolation terminal of the isolation chip U3; the RE / DE signal terminal of the first level conversion chip U5 is connected to the collector of the switching transistor Q1; and both the A and B signal terminals of the first level conversion chip U5 are connected to the first connection terminal CN1.

[0048] In this circuit, the switching transistor Q1 is a bipolar junction transistor (BJT). The first terminal of Q1 is the base, the second terminal is the collector, and the third terminal is the emitter. The base is connected to a current-limiting resistor R01, and the collector is connected to a pull-up resistor R02. Q1, R01, and R02 form a switching circuit. When the base receives a high level, the transistor conducts, the RE / DE pin in the level conversion chip is grounded, and the circuit enters receive mode. When the base receives a low level, the transistor is cut off, the RE / DE pin is connected to a high level, and the circuit enters transmit mode.

[0049] In some embodiments, the outdoor unit monitoring circuit 10 further includes a fourth connection interface 18, which is used to connect to the air conditioner outdoor unit 20. The fourth connection interface 18 includes a second connection terminal CN2 and a second level conversion chip U6. The second connection terminal CN2 is used to connect to the air conditioner outdoor unit 20; the R1I signal terminal and T1O signal terminal of the second level conversion chip U6 are connected to the second connection terminal CN2, and both the R1O signal terminal and T1I signal terminal of the second level conversion chip U6 are connected to the first isolation module 13.

[0050] In one embodiment, the first connection interface 11 is a USB interface, the second connection interface 12 is a TTL level serial port; the third connection terminal is an RS485 signal connection terminal, and the fourth connection terminal is an RS232 signal connection terminal; the first level conversion chip U5 corresponds to a MAX485 chip, and the second level conversion chip U6 corresponds to a MAX232 chip. In this embodiment, the outdoor unit monitoring circuit 10 uses three different types of connection interfaces, allowing selection based on the signal type of the outdoor unit 20 when establishing a communication connection with it, thus expanding the application range of the outdoor unit monitoring circuit 10.

[0051] In practical applications, the operation of the outdoor unit monitoring circuit 10 is as follows:

[0052] When the monitoring terminal 30 needs to send control commands to the outdoor unit 20 of the air conditioner, the monitoring terminal 30 sends the control commands to the signal conversion chip U1 through the first connection interface 11 (USB interface). The signal conversion chip U1 converts the USB protocol data into serial data and outputs it through the TXD signal terminal. After receiving this data, the isolation chip U3 performs electrical isolation through its internal isolation circuit, and then outputs it from the VIB signal terminal to the second connection interface 12. The outdoor unit 20 of the air conditioner receives these control commands through the second connection interface 12 and executes the corresponding operations.

[0053] When the outdoor unit 20 of the air conditioner needs to report status information to the monitoring terminal 30, it sends the status information to the VIA signal terminal of the second chip in the first isolation module 13 through the second connection interface 12. The second chip performs electrical isolation through its internal isolation circuit, and then outputs the information from the VOB signal terminal to the RXD signal terminal of the signal conversion chip U1. The signal conversion chip U1 converts the serial data into USB protocol data, and outputs it to the first connection interface 11 through the protection chip U2 via the D- and D+ signal terminals. The monitoring terminal 30 receives this status information through the first connection interface 11 and processes and displays it accordingly.

[0054] When the outdoor unit 20 of the air conditioner uses an RS-485 interface, it can be connected to the outdoor unit monitoring circuit 10 through the third connection interface 17. The outdoor unit 20 of the air conditioner sends data to the A and B signal terminals of the second level conversion chip U6 through the first connection terminal CN1. The first level conversion chip U5 converts the RS-485 differential level to the TTL / CMOS level and outputs it from the RO signal terminal to the first isolation module 13. Similarly, the isolation chip U3 sends data to the outdoor unit 20 of the air conditioner through the RE / DE signal terminals of the first level conversion chip U5.

[0055] When the outdoor unit 20 of the air conditioner uses an RS-232 interface, it can be connected to the outdoor unit monitoring circuit 10 through the fourth connection interface 18. The outdoor unit 20 of the air conditioner sends data to the R1I signal terminal of the second level conversion chip U6 through the second connection terminal CN2. The second level conversion chip U6 converts the RS-232 level to the TTL / CMOS level and outputs it from the R1O signal terminal to the isolation chip U3. Similarly, the isolation chip U3 sends data to the outdoor unit 20 of the air conditioner through the T1I and T1O signal terminals of the second level conversion chip U6.

[0056] This application embodiment also provides a circuit board on which the above-mentioned outdoor unit monitoring circuit is integrated. Since the outdoor unit monitoring circuit has been described in detail above, it will not be repeated here.

[0057] This application embodiment also provides an air conditioner outdoor unit monitoring device, which includes the above-mentioned circuit board, on which the above-mentioned outdoor unit monitoring circuit is integrated. Since the outdoor unit monitoring circuit has been described in detail above, it will not be repeated here.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] The outdoor unit monitoring circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used in this article to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An outdoor unit monitoring circuit, characterized in that, The outdoor unit monitoring circuit is connected to both the air conditioner outdoor unit and the monitoring terminal. The outdoor unit monitoring circuit includes: A first connection interface is used to connect to the monitoring terminal; The second connection interface is used to connect to the outdoor unit of the air conditioner. A first isolation module is connected to the second connection interface. The first isolation module is used to isolate the signal level of the communication signal between the monitoring terminal and the outdoor unit of the air conditioner. A protection module is connected to the first connection interface and is used to provide electrostatic protection for the first connection interface. An interface conversion module is connected to the first isolation module and the protection module respectively. The interface conversion module is used to convert the first signal input through the first connection interface and the protection module, and then output it through the first isolation module and the second connection interface. The interface conversion module is also used to convert the second signal input through the second connection interface and then output it through the protection module and the first connection interface.

2. The outdoor unit monitoring circuit according to claim 1, characterized in that, The outdoor unit monitoring circuit also includes a second isolation module, which is connected to the interface conversion module and the second connection interface. The interface conversion module is also used to output a corresponding status detection signal through the second connection interface via the second isolation module when the monitoring terminal is connected to the first connection interface; The second isolation module is used to isolate the signal level of the status detection signal between the monitoring terminal and the outdoor unit of the air conditioner.

3. The outdoor unit monitoring circuit according to claim 2, characterized in that, The interface conversion module includes a signal conversion chip. The first signal transmission terminals of the signal conversion chip are all connected to the first isolation module, and the second signal transmission terminals of the signal conversion chip are all connected to the protection module. The signal detection terminal of the signal conversion chip is connected to the second isolation module.

4. The outdoor unit monitoring circuit according to claim 3, characterized in that, The protection module includes a protection chip, the first signal connection terminal of the protection chip is connected to the first connection interface, and the second signal connection terminal of the protection chip is connected to the second signal transmission terminal of the signal conversion chip.

5. The outdoor unit monitoring circuit according to claim 3, characterized in that, The first isolation module includes an isolation chip, the first signal isolation terminal of the isolation chip is connected to the first signal transmission terminal of the signal conversion chip, and the second signal isolation terminal of the isolation chip is connected to the second connection interface.

6. The outdoor unit monitoring circuit according to claim 3, characterized in that, The second isolation module includes an optocoupler. Pin 1 of the optocoupler is connected to the signal detection terminal of the signal conversion chip, pin 2 of the optocoupler is grounded, pin 3 of the optocoupler is grounded, and pin 4 of the optocoupler is connected to the second connection interface.

7. The outdoor unit monitoring circuit according to claim 5, characterized in that, The outdoor unit monitoring circuit also includes a third connection interface, which is connected in parallel with the second connection interface and is used to connect to the outdoor unit of the air conditioner.

8. The outdoor unit monitoring circuit according to claim 7, characterized in that, The third connection interface includes: A switching transistor, the first terminal of which is connected to the second signal isolation terminal of the isolation chip; the second terminal of the switching transistor is energized, and the third terminal of the switching transistor is grounded; A first connection terminal is used to connect to the outdoor unit of the air conditioner; A first level conversion chip, wherein the RD signal terminal of the first level conversion chip is connected to the second signal isolation terminal of the isolation chip, the RE / DE signal terminal of the first level conversion chip is connected to the collector of the switching transistor, and the A signal terminal and the B signal terminal of the first level conversion chip are both connected to the first connection terminal.

9. A circuit board, characterized in that, The circuit board integrates the outdoor unit monitoring circuit as described in any one of claims 1-8.

10. A monitoring device for an outdoor unit of an air conditioner, characterized in that, The air conditioner outdoor unit monitoring equipment includes the outdoor unit monitoring circuit as described in claim 9.

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