Display circuit, display panel and air conditioner

Abstract

The application provides a display circuit, a display panel and an air conditioner. The display circuit is applied to an air conditioner outdoor unit, and comprises a main control module, a communication module connected to the main control module, the communication module being configured to receive operation parameters of an air conditioner indoor unit and send an adjustment signal to the air conditioner indoor unit when receiving an adjustment signal of the main control module, a switch module connected to the main control module, the switch module being configured to convert a received switch instruction into a switch electrical signal, the main control module being configured to adjust the operation parameters based on the switch electrical signal to generate the adjustment signal and generate display data based on the operation parameters, and a display module connected to the main control module, the display module being configured to display content corresponding to the display data when receiving the display data. The embodiment of the application can enable the air conditioner outdoor unit to communicate with the air conditioner indoor unit, display operation parameters of the air conditioner, and change the operation parameters, thereby improving the operation convenience of the air conditioner outdoor unit.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a display circuit, a display panel, and an air conditioner. Background Technology

[0002] The existing outdoor unit of the air conditioner cannot communicate with the indoor unit, and it is impossible to use the remote control or wired controller of the indoor unit to enter certain special modes of engineering testing, such as calibration test mode, refrigerant recovery mode, forced defrosting mode, etc. It is also impossible to change operating parameters, query the operating status of the outdoor unit, fault codes, etc. Utility Model Content

[0003] This application provides a display circuit and display board that enables communication between the outdoor unit and the indoor unit of an air conditioner, allowing changes to operating parameters through the outdoor unit and improving the ease of operation of the outdoor unit.

[0004] This application provides a display circuit applied to an outdoor unit of an air conditioner. The display circuit includes: a main control module; a communication module connected to the main control module; the communication module is used to receive operating parameters of the indoor unit of the air conditioner, and to send the adjustment signal to the indoor unit of the air conditioner when it receives the adjustment signal from the main control module; a switch module connected to the main control module; the switch module is used to convert received switch commands into switch electrical signals; the main control module is used to adjust the operating parameters based on the switch electrical signals to generate the adjustment signal, and to generate display data based on the operating parameters; and a display module connected to the main control module; the display module is used to display the content corresponding to the display data when it receives the display data.

[0005] In some embodiments, the switching command includes a DIP switch command and a button command. The switching module includes: a DIP switch unit connected to the main control module; the DIP switch unit is used to convert the received DIP switch command into a first switching electrical signal; and a button unit connected to the main control module; the button unit is used to convert the received button command into a second switching electrical signal.

[0006] In some embodiments, the DIP switch unit includes: a DIP switch SW1, a resistor R238, a resistor R239, a resistor R240, and a resistor R241; the first terminals of the resistors R238, R239, R240, and R241 are all connected to a first power supply; the second terminal of the resistor R241 is connected to the first terminal of the DIP switch SW1 and the main control module; the second terminal of the resistor R240 is connected to the second terminal of the DIP switch SW1 and the main control module; the second terminal of the resistor R239 is connected to the third terminal of the DIP switch SW1 and the main control module; the second terminal of the resistor R238 is connected to the fourth terminal of the DIP switch SW1 and the main control module; and the fifth, sixth, seventh, and eighth terminals of the DIP switch SW1 are all grounded.

[0007] In some embodiments, the button unit includes: button switch KEY1, button switch KEY2, button switch KEY3, button switch KEY4, resistor R197, resistor R169, resistor R154, and resistor R237; the first terminal of button switch KEY1 is connected to the second terminal of resistor R197 and the main control module, the second terminal of button switch KEY1 is grounded, and the first terminal of resistor R197 is connected to a first power supply; the first terminal of button switch KEY2 is connected to the second terminal of resistor R169 and the main control module, the second terminal of button switch KEY2 is grounded, and the first terminal of resistor R169 is connected to the first power supply; the first terminal of button switch KEY3 is connected to the second terminal of resistor R154 and the main control module, the second terminal of button switch KEY3 is grounded, and the first terminal of resistor R154 is connected to the first power supply; the first terminal of button switch KEY4 is connected to the second terminal of resistor R237 and the main control module, the second terminal of button switch KEY4 is grounded, and the first terminal of resistor R237 is connected to the first power supply.

[0008] In some embodiments, the operating parameters include power on / off status parameters and operating parameters. The communication module includes: a first communication unit connected to the main control module; the first communication unit is used to receive the operating parameters; a second communication unit connected to the main control module; the second communication unit is used to receive the power on / off status parameters; and a third communication unit connected to the main control module; the third communication unit is used to send an adjustment signal to the indoor unit of the air conditioner when it receives an adjustment signal from the main control module.

[0009] In some embodiments, the first communication unit includes: a connector CN1, a resistor R82, a resistor R80, a resistor R81, and a capacitor E18; a first end of the connector CN1 is connected to a first end of the resistor R82, the positive terminal of the capacitor E18, and a first power supply; a second end of the connector CN1 is connected to the negative terminal of the capacitor E18 and grounded; a third end of the connector CN1 is connected to a second end of the resistor R82 and a second end of the resistor R80; a first end of the resistor R80 is connected to the main control module; a fourth end of the connector CN1 is connected to a second end of the resistor R81; and a first end of the resistor R81 is connected to the main control module.

[0010] In some embodiments, the second communication unit includes: connector CN2, transistor Q3, transistor Q5, Zener diode DZ4, Zener diode DZ5, resistor R41, resistor R40, resistor R2, and resistor R39; the first terminal of connector CN2 is grounded, the second terminal of connector CN2 is connected to a first power supply, and the fifth terminal of connector CN2 is connected to a second power supply; the fourth terminal of connector CN2 is connected to the collector of transistor Q3, the first terminal of resistor R40, and the cathode of Zener diode DZ5, and the second terminal of resistor R40 is connected to the anode of Zener diode DZ5. All terminals are grounded. The emitter of transistor Q3 is connected to the first terminal of resistor R41 and the first power supply. The base of transistor Q3 is connected to the second terminal of resistor R41 and the main control module. The third terminal of connector CN2 is connected to the control terminal of transistor Q5, the first terminal of resistor R39, and the negative terminal of Zener diode DZ4. The emitter of transistor Q5, the second terminal of resistor R39, and the positive terminal of Zener diode DZ4 are all grounded. The collector of transistor Q5 is connected to the second terminal of resistor R2 and the main control module. The first terminal of resistor R2 is connected to the first power supply.

[0011] In some embodiments, the third communication unit includes: connector CN27, relays RY1 and RY2, diodes D31, D33, and D36, optocouplers PC8, PC7, and PC11, resistors R291, R294, and R421; the first end of connector CN27 is connected to the first contact of relay RY1 and the first contact of relay RY2; the sixth end of connector CN27 is connected to the second contact of relay RY1, the first end of the coil of relay RY1 is connected to the main control module, and the second end of the coil of relay RY1 is connected to a second power supply; the seventh end of connector CN27 is connected to the second contact of relay RY1, the first end of the coil of relay RY2 is connected to the main control module, and the second end of the coil of relay RY2 is connected to the second power supply; the second end of connector CN27 is connected to the second end of optocouplers PC8, PC7, and PC11; the connector The third terminal of CN27 is connected to the anode of diode D31, the cathode of diode D31 is connected to the first terminal of optocoupler PC8, the fourth terminal of optocoupler PC8 is connected to the first power supply, the third terminal of optocoupler PC8 is connected to the first terminal of resistor R291 and the main control module, and the second terminal of resistor R291 is grounded; the fourth terminal of connector CN27 is connected to the anode of diode D33, the cathode of diode D33 is connected to the first terminal of optocoupler PC7, the fourth terminal of optocoupler PC7 is connected to the first power supply, the third terminal of optocoupler PC7 is connected to the first terminal of resistor R294 and the main control module, and the second terminal of resistor R294 is grounded; the fifth terminal of connector CN27 is connected to the anode of diode D36, the cathode of diode D36 is connected to the first terminal of optocoupler PC11, the fourth terminal of optocoupler PC11 is connected to the first power supply, the third terminal of optocoupler PC11 is connected to the first terminal of resistor R421 and the main control module, and the second terminal of resistor R421 is grounded.

[0012] Secondly, embodiments of this application provide a display panel applied to an air conditioner outdoor unit, the display panel including the display circuit described above.

[0013] Thirdly, this application provides an air conditioner, which includes an indoor unit and an outdoor unit, and the outdoor unit is provided with a display panel as described above.

[0014] The beneficial effects of this application's embodiments: This application provides a display circuit, a display board, and an air conditioner. The display circuit is applied to the outdoor unit of an air conditioner and includes: a main control module; a communication module connected to the main control module; the communication module is used to receive operating parameters of the indoor unit of the air conditioner and to send the adjustment signal to the indoor unit of the air conditioner when it receives the adjustment signal from the main control module; a switch module connected to the main control module; the switch module is used to convert received switch commands into switch electrical signals; the main control module is used to adjust the operating parameters based on the switch electrical signals to generate the adjustment signal and to generate display data based on the operating parameters; and a display module connected to the main control module; the display module is used to display the content corresponding to the display data when it receives the display data. This application's embodiments enable communication between the outdoor unit and the indoor unit of the air conditioner, while allowing the outdoor unit to display the operating parameters of the air conditioner, and the operating parameters can be changed through the switch module, improving the operational convenience of the outdoor unit. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a structural block diagram of a display circuit provided in one embodiment of this application;

[0017] Figure 2 This is a detailed structural block diagram of a communication module provided in one embodiment of this application;

[0018] Figure 3 This is a detailed structural block diagram of a switching module provided in one embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the circuit structure of the first communication unit provided in an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the circuit structure of the second communication unit provided in an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the circuit structure of the third communication unit provided in an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the circuit structure of a DIP switch unit provided in an embodiment of this application;

[0023] Figure 8 This is a schematic diagram of the circuit structure of a button unit provided in an embodiment of this application;

[0024] Figure 9This is a schematic diagram of the circuit structure of a display module provided in an embodiment of this application;

[0025] Figure 10 This is a schematic diagram of a display panel provided in one embodiment of this application. Detailed Implementation

[0026] 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.

[0027] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Existing air conditioner outdoor units cannot communicate with indoor units, preventing users from accessing specific engineering testing modes such as calibration, refrigerant recovery, and forced defrosting via remote control or wired controllers. Furthermore, it's impossible to change operating parameters, check the outdoor unit's operating status, or view fault codes. Therefore, this application provides a display circuit, display board, and air conditioner that enables communication between the outdoor and indoor units. Users can change operating parameters through the outdoor unit, improving its ease of operation.

[0029] Please see Figure 1 , Figure 1 This is a structural block diagram of a display circuit 100 provided in an embodiment of this application.

[0030] This application provides a display circuit 100, which is applied to an outdoor unit of an air conditioner. The display circuit 100 includes a main control module 10, a communication module 20, a switch module 30, and a display module 40.

[0031] Among them, the communication module 20 is connected to the main control module 10, the switch module 30 is connected to the main control module 10, and the display module 40 is connected to the main control module 10.

[0032] Specifically, the communication module 20 is used to receive the operating parameters of the indoor unit of the air conditioner, and to send an adjustment signal to the indoor unit of the air conditioner when it receives the adjustment signal from the main control module 10; the switch module 30 is used to convert the received switch command into a switch electrical signal; the main control module 10 is used to adjust the operating parameters based on the switch electrical signal to generate an adjustment signal, and to generate display data based on the operating parameters; the display module 40 is used to display the content corresponding to the display data when it receives the display data.

[0033] In this embodiment, the operating parameters of the indoor unit of the air conditioner include on / off state parameters and operating parameters. On / off state parameters include on-state and off-state, while operating parameters include compressor frequency, fan speed, and electronic expansion valve step count. The switch command is a command generated when the user operates the switch module 30. The user can adjust or control the operating parameters by inputting switch commands to the switch module 30. For example, when the switch module 30 includes a push-button switch, the user can generate a switch command by pressing the push-button switch. The switch electrical signal is an electrical signal generated by the switch module 30 based on the switch command, such as a voltage signal or a level signal. The adjustment signal is a signal generated by the main control module 10 based on the switch electrical signal. The adjustment signal includes signals for entering a special mode, querying the operating status of the outdoor unit, and changing the operating parameters. The displayed data includes compressor frequency, fan speed, electronic expansion valve step count, and fault codes.

[0034] In some embodiments, the main control module 10 may be an MCU (Micro Control Unit) or other control device capable of performing the same function.

[0035] In practical applications, firstly, the communication module 20 receives operating parameters (such as on / off status parameters, compressor frequency, fan speed, electronic expansion valve steps, etc.) sent by the indoor unit of the air conditioner, and transmits these parameters to the main control module 10. Next, the switch module 30 receives external switch commands (such as adjustment commands issued by the user) and converts them into switch electrical signals, which are then transmitted to the main control module 10. Then, the main control module 10 adjusts the operating parameters received by the communication module 20 according to the switch electrical signals (e.g., entering a special mode, changing operating parameters, etc.), generates corresponding adjustment signals, and sends these signals to the indoor unit of the air conditioner through the communication module 20, thereby controlling the operating status of the indoor unit. Finally, while processing the operating parameters, the main control module 10 generates display data (such as current temperature, operating mode, fault codes, etc.) based on the current operating parameters and sends this data to the display module 40. Finally, after receiving the display data, the display module 40 will present the air conditioner's operating parameters in an intuitive way (such as digital tube, LCD screen, etc.), thereby enabling the outdoor unit and indoor unit of the air conditioner to communicate. At the same time, the outdoor unit can display the air conditioner's operating parameters and can change the operating parameters, improving the ease of operation of the outdoor unit.

[0036] Please see Figure 2 , Figure 2 This is a detailed structural block diagram of the communication module 20 provided in one embodiment of this application.

[0037] In some embodiments, the operating parameters include power on / off status parameters and operating parameters. The communication module 20 includes a first communication unit 21, a second communication unit 22, and a third communication unit 23. Specifically, the first communication unit 21 is connected to the main control module 10, the second communication unit 22 is connected to the main control module 10, and the third communication unit 23 is connected to the main control module 10. Specifically, the first communication unit 21 is used to receive operating parameters; the second communication unit 22 is used to receive power on / off status parameters; and the third communication unit 23 is used to send an adjustment signal to the indoor unit of the air conditioner upon receiving an adjustment signal from the main control module 10.

[0038] In this embodiment, the first communication unit 21 can connect to the Internet via an external 4G module, WIFI module, etc., and can obtain fault codes and operating parameters. Operating parameters include compressor frequency, fan speed, electronic expansion valve steps, etc. The second communication unit 22 can be connected to the main control power board of the indoor unit to receive the indoor unit's on / off status parameters (including on and off states). The third communication unit 23 can be connected to the indoor unit to transmit adjustment signals (including entering special modes, changing operating parameters, etc.) to the indoor unit.

[0039] Please see Figure 3 , Figure 3 This is a detailed structural block diagram of a switch module 30 provided in one embodiment of this application.

[0040] In some embodiments, the switching commands include DIP switch commands and button commands. The switching module 30 includes a DIP switch unit 31 and a button unit 32. The DIP switch unit 31 is connected to the main control module 10, and the button unit 32 is also connected to the main control module 10. Specifically, the DIP switch unit 31 is used to convert the received DIP switch commands into a first switching electrical signal; the button unit 32 is used to convert the received button commands into a second switching electrical signal.

[0041] In this embodiment, the switching instructions include DIP switch instructions and button instructions. Specifically, the user performs long presses or short presses on the button switches in button unit 32 to generate button instructions; and performs up-to-down-to-up-to-down operations on the DIP switches in DIP switch unit 31 to generate DIP switch instructions. For example, DIP switch instructions include instructions for selecting between cooling-only and cooling / heating models, instructions for selecting between 485 and 24V communication, instructions for selecting the rated capacity of the entire unit, and instructions for switching on special functions; button instructions include instructions for setting buttons and button return, instructions for pressing up and down buttons, and instructions for pressing the confirm button.

[0042] This allows for the customization of different combinations of DIP switch commands and key presses, corresponding to methods for modifying operating parameters. These methods include entering special modes (calibration test mode, refrigerant recovery mode, forced defrosting mode, etc.), querying the outdoor unit's operating status (on / off status, etc.), and changing operating parameters (compressor frequency, fan speed, electronic expansion valve steps, etc.).

[0043] Specifically, the main control module 10 can generate corresponding adjustment signals based on the first and second switch electrical signals. These adjustment signals include signals for entering special modes, querying the operating status of the outdoor unit, and changing operating parameters. Displayed data includes compressor frequency, fan speed, electronic expansion valve steps, and fault codes.

[0044] Please see Figure 4 , Figure 4 This is a schematic diagram of the circuit structure of the first communication unit 21 provided in an embodiment of this application.

[0045] In some embodiments, the first communication unit 21 includes a connector CN1, a resistor R82, a resistor R80, a resistor R81, and a capacitor E18. The first end of the connector CN1 is connected to the first end of the resistor R82, the positive terminal of the capacitor E18, and a first power supply (the connection point of the first power supply is...). Figure 4The second end of connector CN1 is connected to the negative terminal of capacitor E18 and grounded (+5V_S). The third end of connector CN1 is connected to the second end of resistor R82 and the second end of resistor R80. The first end of resistor R80 is connected to the main control module 10. The fourth end of connector CN1 is connected to the second end of resistor R81. The first end of resistor R81 is connected to the main control module 10.

[0046] In some embodiments, the first communication unit 21 further includes a capacitor C33, with the first end of the capacitor C33 connected to the first end of the resistor R80 and the second end of the capacitor C33 grounded.

[0047] In this embodiment, connector CN1 is the physical interface, which can be connected to the Internet via an external 4G module, WIFI module, etc., to query fault codes and operating parameters. Capacitor E18 is used to smooth power fluctuations and ensure stable power supply. Resistors R80 and R81 are used for current limiting, protecting the I / O ports of the main control module 10 and matching signal levels. Resistors R82 and R80 form a voltage divider circuit, converting the operating parameters to an acceptable level range (e.g., 3.3V) for the main control module 10 to prevent overvoltage damage to the I / O ports of the main control module 10. Capacitor C33 and resistor R80 form an RC filter circuit to filter out noise and reduce interference signals affecting the signal reception of the main control module 10.

[0048] Please see Figure 5 , Figure 5 This is a schematic diagram of the circuit structure of the second communication unit 22 provided in an embodiment of this application.

[0049] In some embodiments, the second communication unit 22 includes connector CN2, transistor Q3, transistor Q5, Zener diode DZ4, Zener diode DZ5, resistor R41, resistor R40, resistor R2, and resistor R39.

[0050] The connector CN2 has the following terminals: the first terminal is grounded, the second terminal is connected to the first power supply, and the fifth terminal is connected to the second power supply; the fourth terminal is connected to the collector of transistor Q3, the first terminal of resistor R40, and the negative terminal of Zener diode DZ5; the second terminal of resistor R40 and the positive terminal of Zener diode DZ5 are both grounded; the emitter of transistor Q3 is connected to the first terminal of resistor R41 and the first power supply; and the base of transistor Q3 is connected to the second terminal of resistor R41 and the main control module 10; the third terminal is connected to the control terminal of transistor Q5, the first terminal of resistor R39, and the negative terminal of Zener diode DZ4; the emitter of transistor Q5, the second terminal of resistor R39, and the positive terminal of Zener diode DZ4 are all grounded; the collector of transistor Q5 is connected to the second terminal of resistor R2 and the main control module 10; and the first terminal of resistor R2 is connected to the first power supply.

[0051] Among them, transistor Q3 is a PNP transistor, and transistor Q5 is an NPN transistor.

[0052] In some embodiments, the second communication unit 22 further includes resistors R3, R35, R1, and R34, capacitors C19, C18, C1, C12, E1, and E2.

[0053] In this circuit, resistor R3 is connected in series between the base of transistor Q3 and the main control module 10; resistor R35 is connected in series between the collector of transistor Q3 and the cathode of Zener diode DZ5; resistor R1 is connected in series between the main control module 10 and the collector of transistor Q5; resistor R34 is connected in series between the base of transistor Q5 and the cathode of Zener diode DZ4; the first terminal of capacitor C19 is connected to the connection between resistor R1 and the main control module 10; the first terminal of capacitor C18 is connected to the base of transistor Q5; and the second terminals of both capacitors C19 and C18 are grounded. The fifth terminal of connector CN2 is connected to the first terminal of capacitor C1, the positive terminal of capacitor E1, and the second power supply (+12V); the first terminal of connector CN2 is connected to the first terminal of capacitor C12, the negative terminal of capacitor E2, and the first power supply (+5V_S); and the second terminals of capacitors C1, E1, C12, and E2 are connected to a single point and grounded.

[0054] In this embodiment, the on / off status parameters of the indoor unit are input through the third terminal of connector CN2, and drive transistor Q5 after voltage division by resistor R34. When the indoor unit is on, a high-level signal turns on Q5, pulling up the voltage of the first power supply through resistor R2 and transmitting it to the W-RXD pin of the main control module 10, indicating the on / off status; conversely, transistor Q5 is off, and the main control module 10 detects a low level, indicating that the indoor unit is off. The main control module 10 controls the power status of the indoor unit through transistor Q3 and the fourth terminal of connector CN2. When the W-TXD pin of the main control module 10 sends a high level, transistor Q3 is off, and the power supply to the indoor unit is disconnected; when the W-TXD pin of the main control module 10 sends a low level, transistor Q3 is on, connecting the first power supply to the indoor unit, realizing on / off control.

[0055] Please see Figure 6 , Figure 6 This is a schematic diagram of the circuit structure of the third communication unit 23 provided in an embodiment of this application.

[0056] In some embodiments, the third communication unit 23 includes connector CN27, relay RY1, relay RY2, diode D31, diode D33, diode D36, optocoupler PC8, optocoupler PC7, optocoupler PC11, resistor R291, resistor R294, and resistor R421.

[0057] Specifically, connector CN27 has the following connections: the first end connects to the first contact of relay RY1 and the first contact of relay RY2; the sixth end connects to the second contact of relay RY1, the first end of the coil of relay RY1 is connected to the main control module 10, and the second end of the coil of relay RY1 is connected to the second power supply; the seventh end connects to the second contact of relay RY1, the first end of the coil of relay RY2 is connected to the main control module 10, and the second end of the coil of relay RY2 is connected to the second power supply; the second end connects to the second ends of optocouplers PC8, PC7, and PC11; the third end connects to the positive terminal of diode D31, and the negative terminal of diode D31 is connected to the first end of optocoupler PC8. The fourth terminal of optocoupler PC8 is connected to the first power supply. The third terminal of optocoupler PC8 is connected to the first terminal of resistor R291 and the main control module 10. The second terminal of resistor R291 is grounded. The fourth terminal of connector CN27 is connected to the positive terminal of diode D33. The negative terminal of diode D33 is connected to the first terminal of optocoupler PC7. The fourth terminal of optocoupler PC7 is connected to the first power supply. The third terminal of optocoupler PC7 is connected to the first terminal of resistor R294 and the main control module 10. The second terminal of resistor R294 is grounded. The fifth terminal of connector CN27 is connected to the positive terminal of diode D36. The negative terminal of diode D36 is connected to the first terminal of optocoupler PC11. The fourth terminal of optocoupler PC11 is connected to the first power supply. The third terminal of optocoupler PC11 is connected to the first terminal of resistor R421 and the main control module 10. The second terminal of resistor R421 is grounded.

[0058] In some embodiments, the third communication unit 23 further includes:

[0059] A resistor R171 is connected in series between the first power supply and the fourth terminal of the optocoupler PC8; a resistor R27 is connected in series between the third terminal of the optocoupler PC8 and the main control module 10; a capacitor C154, the first terminal of which is connected to the connection between the resistor R27 and the main control module 10, and the second terminal of which is grounded; resistors R170, R130, R142, R172, and R119, resistors R170 and R130 are connected in series, the non-series terminal of resistor R170 is connected to the first terminal of the optocoupler PC8 and the first terminal of resistor R142, the non-series terminal of resistor R130 is connected to the negative terminal of diode D31, resistors R172 and R119 are connected in series, the non-series terminal of resistor R172 is connected to the second terminal of the optocoupler PC8 and the second terminal of resistor R142, and the non-series terminal of resistor R119 is connected to the second terminal of connector CN27;

[0060] A resistor R177 is connected in series between the first power supply and the fourth terminal of the optocoupler PC7; a resistor R261 is connected in series between the third terminal of the optocoupler PC7 and the main control module 10; a capacitor C133, the first terminal of which is connected to the connection between the resistor R261 and the main control module 10, and the second terminal of which is grounded; resistors R173, R156, R120, R121, and R195, resistors R173 and R156 are connected in series, the non-series terminal of resistor R173 is connected to the first terminal of the optocoupler PC7 and the first terminal of resistor R120, the non-series terminal of resistor R156 is connected to the negative terminal of diode D33, resistors R121 and R195 are connected in series, the non-series terminal of resistor R121 is connected to the second terminal of the optocoupler PC7 and the second terminal of resistor R120, and the non-series terminal of resistor R195 is connected to the second terminal of connector CN27;

[0061] A resistor R179 is connected in series between the first power supply and the fourth terminal of the optocoupler PC11; a resistor R420 is connected in series between the third terminal of the optocoupler PC11 and the main control module 10; a capacitor C161, the first terminal of which is connected to the connection between the resistor R420 and the main control module 10, and the second terminal of which is grounded; resistors R423, R425, R422, R424, and R426, resistors R423 and R425 are connected in series, the non-series terminal of resistor R423 is connected to the first terminal of the optocoupler PC11 and the first terminal of resistor R422, the non-series terminal of resistor R425 is connected to the cathode of diode D36, resistors R424 and R426 are connected in series, the non-series terminal of resistor R424 is connected to the second terminal of the optocoupler PC11 and the second terminal of resistor R422, and the non-series terminal of resistor R426 is connected to the second terminal of connector CN27.

[0062] Specifically, the port definitions of connector CN27 are as follows: the first terminal (R) of connector CN27 is the AC24V communication power supply terminal; the second terminal (C) of connector CN27 is the AC24V communication common terminal; the third terminal (Y1) of connector CN27 is the compressor low-speed signal terminal (thermostat compressor low-speed signal); the fourth terminal (Y2) of connector CN27 is the compressor high-speed signal terminal (thermostat compressor high-speed signal); the fifth terminal (B) of connector CN27 is the energized heating four-way valve signal terminal (thermostat four-way valve signal); the sixth terminal (D) of connector CN27 is the defrost signal terminal (air conditioner outdoor unit defrost relay output signal); and the seventh terminal (L) of connector CN27 is the fault signal terminal (air conditioner outdoor unit fault relay output signal).

[0063] In this embodiment, taking the signal transmission of the compressor low-speed signal (Y1) as an example, the AC24V signal output by the indoor unit of the air conditioner (the third terminal of connector CN27) is rectified by diode D31 and then drives optocoupler PC8 through a resistor voltage divider network (resistors R170, R130, etc.). When optocoupler PC8 is turned on, the first power supply (+5V_S) forms a circuit through resistor R171 and the internal light-emitting diode of optocoupler PC8, and the phototransistor is turned on, converting the signal to TTL level (approximately 5V) and then transmitting it to the main control module 10 through resistor R27. Capacitor C154 filters out high-frequency noise to ensure signal stability. Resistor R291 is used for pull-down to prevent interference signals from triggering falsely. Furthermore, the signal transmission of the compressor high-speed signal (Y2) and the four-way valve signal (B) is similar to that of the compressor low-speed signal (Y1), with signals acquired through optocoupler PC7 and optocoupler PC11 respectively, realizing compressor high / low speed switching and heating mode control.

[0064] Meanwhile, when defrosting is required or a fault is detected, the main control module 10 drives relays RY1 or RY2 to connect the AC24V power supply to the defrost (D) or fault (L) port. After the indoor unit of the air conditioner detects the AC24V signal of the corresponding port, it executes the corresponding action (such as starting the defrost program or displaying a fault code).

[0065] Please see Figure 7 , Figure 7 This is a schematic diagram of the circuit structure of the DIP switch unit 31 provided in an embodiment of this application.

[0066] In some embodiments, the DIP switch unit 31 includes a DIP switch SW1, resistors R238, R239, R240, and R241. The first ends of resistors R238, R239, R240, and R241 are all connected to a first power supply. The second end of resistor R241 is connected to the first end of DIP switch SW1 and the main control module 10. The second end of resistor R240 is connected to the second end of DIP switch SW1 and the main control module 10. The second end of resistor R239 is connected to the third end of DIP switch SW1 and the main control module 10. The second end of resistor R238 is connected to the fourth end of DIP switch SW1 and the main control module 10. The fifth, sixth, seventh, and eighth ends of DIP switch SW1 are all grounded.

[0067] In some embodiments, the DIP switch unit 31 further includes a resistor R242 connected in series between the first terminal of the DIP switch SW1 and the main control module 10, a resistor R243 connected in series between the second terminal of the DIP switch SW1 and the main control module 10, a resistor R2427 connected in series between the third terminal of the DIP switch SW1 and the main control module 10, and a resistor R248 connected in series between the fourth terminal of the DIP switch SW1 and the main control module 10.

[0068] In this embodiment, in the DIP switch unit 31, one end of each of the four pull-up resistors (resistors R238, R239, R240, and R241) is connected to the first power supply (+5V_S), and the other end is connected to the four signal terminals (first to fourth terminals) of the DIP switch SW1 and the main control module 10, respectively. The other four pins (fifth to eighth terminals) of the DIP switch SW1 are all grounded. When the user operates the DIP switch (such as flipping it up or down), the signal terminal and the ground terminal of the DIP switch SW1 will be in a conducting or disconnected state: if a signal terminal is conducting with the ground terminal, the voltage of the corresponding pull-up resistor will be pulled low, forming a low-level (e.g., 0V) signal transmitted to the main control module 10; if it is not conducting, the pull-up resistor will maintain the voltage at a high level (e.g., 5V), and the main control module 10 will receive the high-level signal. In addition, the resistors (R242, R243, R247, R248, etc.) connected in series between the signal terminals and the main control module serve as current limiting protection to prevent excessive current from damaging the I / O ports of the main control module 10. Through this design, the four signal terminals of the DIP switch SW1 can be combined to produce 16 different high and low level states (e.g., "0000" to "1111"). Each state corresponds to a specific DIP instruction (e.g., model selection, communication mode switching, etc.). By recognizing these level combinations, the main control module can parse the user's DIP intentions and generate corresponding adjustment signals to achieve precise control of the air conditioner's operating parameters.

[0069] Please see Figure 8 , Figure 8 This is a schematic diagram of the circuit structure of the button unit 32 provided in one embodiment of this application.

[0070] In some embodiments, the button unit 32 includes button switches KEY1, KEY2, KEY3, and KEY4, resistors R197, R169, R154, and R237. Specifically, the first terminal of button switch KEY1 is connected to the second terminal of resistor R197 and the main control module 10, and the second terminal of button switch KEY1 is grounded; the first terminal of resistor R197 is connected to a first power supply. The first terminal of button switch KEY2 is connected to the second terminal of resistor R169 and the main control module 10, and the second terminal of button switch KEY2 is grounded; the first terminal of button switch KEY3 is connected to the second terminal of resistor R154 and the main control module 10, and the second terminal of button switch KEY3 is grounded; the first terminal of resistor R154 is connected to the first power supply. The first terminal of button switch KEY4 is connected to the second terminal of resistor R237 and the main control module 10, and the second terminal of button switch KEY4 is grounded; the first terminal of resistor R237 is connected to the first power supply.

[0071] In some embodiments, the button unit 32 further includes resistors R145, R152, R251, C141, C130, C147, and C98. Specifically, the first end of resistor R145 is connected to the first end of capacitor C141 and the main control module 10; the second end of resistor R145 is connected to the first end of button switch KEY1; the first end of resistor R152 is connected to the first end of capacitor C130 and the main control module 10; the second end of resistor R152 is connected to the first end of button switch KEY2; the first end of resistor R155 is connected to the first end of capacitor C147 and the main control module 10; the second end of resistor R155 is connected to the first end of button switch KEY3; the first end of resistor R251 is connected to the first end of capacitor C98 and the main control module 10; the second end of resistor R251 is connected to the first end of button switch KEY4; and the second ends of capacitors C141, C130, C147, and C98 are all grounded.

[0072] In this embodiment, each push-button switch (KEY1 to KEY4) uses a combination of pull-up resistors and grounding switches. One end of resistors R197, R169, R154, and R237 is connected to the first power supply (+5V_S), and the other end is connected to the first terminal of the corresponding button and the main control module 10, respectively. The second terminal of the push-button switch is directly grounded. When the button is not pressed, the pull-up resistor pulls the level of the first terminal of the button high (e.g., 5V), and the main control module 10 receives the high-level signal. When the user presses the button, the first terminal of the button is connected to ground, and the level is pulled low (e.g., 0V). The main control module 10 identifies the button operation (e.g., confirmation, up / down adjustment, etc.) by detecting this level change. In addition, the resistors (R145, R152, R251) connected in series between the buttons and the main control module 10 serve as current limiters to prevent the inrush current at the moment the buttons are turned on from damaging the I / O ports of the main control module. The capacitors (C141, C130, C147, C98) connected in parallel at the signal input terminal of the main control module 10, together with the aforementioned resistors, form an RC filter circuit, which can filter out high-frequency noise generated by button mechanical bounce (such as momentary noise when the button is pressed / released), ensuring that the signal received by the main control module is stable and reliable, and avoiding false triggering. This design allows each button to work independently, with different button commands corresponding to changes in high and low levels (such as KEY1 corresponding to "confirm", KEY2 corresponding to "return", etc.). The main control module 10 can analyze the user's intention based on the combination of different button level signals and generate adjustment signals (such as entering a special mode or changing operating parameters), ultimately achieving precise control of the air conditioner's operating status.

[0073] Please see Figure 9 , Figure 9 This is a schematic diagram of the circuit structure of a display module 40 provided in one embodiment of this application.

[0074] In some embodiments, the display module 40 includes a chip IC18, a digital tube DSP1, transistors Q8, Q9, and Q11, resistors R192, R168, R194, R193, R272, R270, R176, R361, R365, R369, R139, R6, R148, R188, R364, R158, R65, and R166, capacitors C127, C166, C109, and E22.

[0075] Among them, the first terminal of chip IC18 is connected to the second terminal of chip IC18, the second terminal of resistor R369 and the first terminal of capacitor C109. The first terminal of resistor R369 is connected to the second terminal of resistor R365 and the main control module 10. The first terminal of resistor R365 is connected to the first power supply. The second terminal of capacitor C109 is grounded.

[0076] The third terminal of chip IC18 is connected to the tenth terminal of digital tube DSP1 through resistor R188;

[0077] The fourth terminal of chip IC18 is connected to the seventh terminal of digital tube DSP1 through resistor R148;

[0078] The fifth terminal of chip IC18 is connected to the fourth terminal of digital tube DSP1 through resistor R6;

[0079] The sixth terminal of chip IC18 is connected to the second terminal of digital tube DSP1 through resistor R139;

[0080] The seventh terminal of chip IC18 is grounded;

[0081] The eighth terminal of chip IC18 is connected to the second terminal of resistor R176 and the first terminal of capacitor C127. The first terminal of resistor R176 is connected to the second terminal of resistor R361 and the main control module 10. The first terminal of resistor R361 is connected to the first power supply, and capacitor C127 is grounded.

[0082] The ninth terminal of chip IC18 is connected to the first power supply, the first terminal of capacitor C166, the positive terminal of capacitor E22, the fourteenth terminal of chip IC18, the first terminal of resistor R168, the emitter of transistor Q8, the first terminal of resistor R193, the emitter of transistor Q9, the first terminal of resistor R270, and the emitter of transistor Q11. The base of transistor Q8 is connected to the second terminals of resistor R168 and resistor R192. The first terminal of resistor R192 is connected to the main control module 10. The collector of transistor Q8 is connected to the twelfth terminal of digital tube DSP1. The base of transistor Q9 is connected to the second terminal of resistor R193 and the second terminal of resistor R194. The first terminal of resistor R194 is connected to the main control module 10. The collector of transistor Q9 is connected to the ninth terminal of digital tube DSP1. The base of transistor Q11 is connected to the second terminal of resistor R270 and the second terminal of resistor R272. The first terminal of resistor R272 is connected to the main control module 10. The collector of transistor Q11 is connected to the eighth terminal of digital tube DSP1.

[0083] The tenth terminal of chip IC18 is connected to the first terminal of digital tube DSP1 through resistor R166;

[0084] The eleventh terminal of chip IC18 is connected to the tenth terminal of digital tube DSP1 through resistor R165;

[0085] The twelfth terminal of chip IC18 is connected to the fifth terminal of digital tube DSP1 through resistor R158;

[0086] The thirteenth terminal of chip IC18 is connected to the third terminal of digital tube DSP1 through resistor R364.

[0087] Among them, transistors Q8, Q9, and Q11 are all PNP transistors.

[0088] Among them, the IC18 chip can be a 74HC164 chip or other chips that can perform the same function.

[0089] In this embodiment, the main control module 10 generates the corresponding segment code (binary data, such as lighting segments a, b, g, e, and d to display "2") according to the content to be displayed (e.g., "26℃"). This data is then sent to the first and second terminals (data / clock) of the chip IC18 via serial communication. Under clock pulse triggering, the chip IC18 shifts the serial data to the parallel output terminal, driving the segment pins of the digital tube DSP1 through current-limiting resistors to determine the number to be displayed.

[0090] In addition, the main control module 10 sequentially outputs low-level signals to the bases of transistors Q8, Q9, and Q11, causing the transistors to conduct in turn: for example, Q8 (bit 1) is turned on first, and the first digit of the digital tube is connected to the first power supply (+5V_S). At this time, the chip IC18 outputs the segment code of the first digit, and the first digit displays the corresponding number; then, transistor Q8 is turned off and transistor Q9 (bit 2) is turned on, and the chip IC18 switches to the segment code of the second digit, and the second digit displays the corresponding number; then, transistor Q9 is turned off and transistor Q11 (bit 3) is turned on, and the chip IC18 switches to the segment code of the third digit, and the third digit displays the corresponding number. The above process is repeated. Because the switching speed is fast (usually >50Hz), it takes advantage of the persistence of vision in the human eye to make it appear that all three digits are lit at the same time, achieving a stable multi-digit display.

[0091] This application provides a display circuit applied to an air conditioner outdoor unit. The display circuit includes: a main control module; a communication module connected to the main control module; the communication module is used to receive operating parameters from the air conditioner indoor unit and to send adjustment signals to the air conditioner indoor unit when it receives adjustment signals from the main control module; a switch module connected to the main control module; the switch module is used to convert received switch commands into switch electrical signals; the main control module is used to adjust the operating parameters based on the switch electrical signals to generate adjustment signals and to generate display data based on the operating parameters; and a display module connected to the main control module; the display module is used to display the content corresponding to the display data when it receives the display data. This application embodiment enables communication between the air conditioner outdoor unit and the air conditioner indoor unit, while allowing the air conditioner outdoor unit to display the air conditioner's operating parameters and modify the operating parameters, thus improving the operational convenience of the air conditioner outdoor unit.

[0092] Please see Figure 10 , Figure 10 This is a schematic diagram of a display panel provided in one embodiment of this application.

[0093] This application embodiment also provides a display panel 200, applied to an air conditioner outdoor unit, the display panel 200 including the display circuit 100 as described above.

[0094] Figure 10 An exemplary layout of a display panel 200 is provided, which includes a main control module 10 (MCU), connectors CN1, CN2, and CN3, a three-digit LED display DSP1, four push-button switches (KEY1, KEY2, KEY3, and KEY4), and a DIP switch SW1 in the display circuit 100. In some other embodiments, components in the display panel 200 may be added or removed according to actual needs.

[0095] This application embodiment also provides an air conditioner, which includes an indoor unit and an outdoor unit, and the outdoor unit is provided with a display panel 200 as described above.

[0096] 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.

[0097] The display circuit, display panel, and air conditioner provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are 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 modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to 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. A display circuit, characterized by comprising: The display circuit, used in an air conditioner outdoor unit, includes: Main control module; A communication module is connected to the main control module; the communication module is used to receive the operating parameters of the indoor unit of the air conditioner, and to send the adjustment signal to the indoor unit of the air conditioner when it receives the adjustment signal from the main control module. A switch module is connected to the main control module; the switch module is used to convert received switch commands into switch electrical signals; the main control module is used to adjust the operating parameters based on the switch electrical signals to generate the adjustment signal, and to generate display data based on the operating parameters; The display module is connected to the main control module; the display module is used to display the content corresponding to the display data when it receives the display data.

2. The display circuit according to claim 1, characterized in that, The switching commands include DIP switch commands and button commands, and the switching module includes: A DIP switch unit is connected to the main control module; the DIP switch unit is used to convert the received DIP switch command into a first switching electrical signal. A button unit is connected to the main control module; the button unit is used to convert the received button command into a second switch electrical signal.

3. The display circuit of claim 2, wherein, The DIP switch unit includes: DIP switch SW1, resistor R238, resistor R239, resistor R240 and resistor R241; The first terminals of resistors R238, R239, R240, and R241 are all connected to a first power supply. The second terminal of resistor R241 is connected to the first terminal of DIP switch SW1 and the main control module. The second terminal of resistor R240 is connected to the second terminal of DIP switch SW1 and the main control module. The second terminal of resistor R239 is connected to the third terminal of DIP switch SW1 and the main control module. The second terminal of resistor R238 is connected to the fourth terminal of DIP switch SW1 and the main control module. The fifth, sixth, seventh, and eighth terminals of DIP switch SW1 are all grounded.

4. The display circuit of claim 2, wherein, The button unit includes: Push button switches KEY1, KEY2, KEY3, and KEY4; resistors R197, R169, R154, and R237; The first terminal of the push button switch KEY1 is connected to the second terminal of the resistor R197 and the main control module. The second terminal of the push button switch KEY1 is grounded, and the first terminal of the resistor R197 is connected to the first power supply. The first terminal of the push button switch KEY2 is connected to the second terminal of the resistor R169 and the main control module. The second terminal of the push button switch KEY2 is grounded, and the first terminal of the resistor R169 is connected to the first power supply. The first terminal of the push button switch KEY3 is connected to the second terminal of the resistor R154 and the main control module. The second terminal of the push button switch KEY3 is grounded, and the first terminal of the resistor R154 is connected to the first power supply. The first terminal of the push button switch KEY4 is connected to the second terminal of the resistor R237 and the main control module. The second terminal of the push button switch KEY4 is grounded, and the first terminal of the resistor R237 is connected to the first power supply.

5. The display circuit of claim 1, wherein, The operating parameters include power on / off status parameters and operating parameters, and the communication module includes: A first communication unit is connected to the main control module; the first communication unit is used to receive the operating parameters. The second communication unit is connected to the main control module; the second communication unit is used to receive the power on / off status parameters. The third communication unit is connected to the main control module; the third communication unit is used to send the adjustment signal to the indoor unit of the air conditioner when it receives the adjustment signal from the main control module.

6. The display circuit of claim 5, wherein, The first communication unit includes: Connector CN1, resistor R82, resistor R80, resistor R81, and capacitor E18; The first end of connector CN1 is connected to the first end of resistor R82, the positive terminal of capacitor E18, and the first power supply. The second end of connector CN1 is connected to the negative terminal of capacitor E18 and grounded. The third end of connector CN1 is connected to the second end of resistor R82 and the second end of resistor R80. The first end of resistor R80 is connected to the main control module. The fourth end of connector CN1 is connected to the second end of resistor R81. The first end of resistor R81 is connected to the main control module.

7. The display circuit of claim 5, wherein, The second communication unit includes: Connector CN2, transistor Q3, transistor Q5, Zener diode DZ4, Zener diode DZ5, resistor R41, resistor R40, resistor R2, and resistor R39; The first end of connector CN2 is grounded, the second end of connector CN2 is connected to the first power supply, and the fifth end of connector CN2 is connected to the second power supply. The fourth terminal of connector CN2 is connected to the collector of transistor Q3, the first terminal of resistor R40, and the negative terminal of Zener diode DZ5. The second terminal of resistor R40 and the positive terminal of Zener diode DZ5 are both grounded. The emitter of transistor Q3 is connected to the first terminal of resistor R41 and the first power supply. The base of transistor Q3 is connected to the second terminal of resistor R41 and the main control module. The third end of connector CN2 is connected to the control terminal of transistor Q5, the first end of resistor R39, and the negative terminal of Zener diode DZ4. The emitter of transistor Q5, the second end of resistor R39, and the positive terminal of Zener diode DZ4 are all grounded. The collector of transistor Q5 is connected to the second end of resistor R2 and the main control module. The first end of resistor R2 is connected to the first power supply.

8. The display circuit of claim 5, wherein, The third communication unit includes: Connector CN27, relay RY1, relay RY2, diode D31, diode D33, diode D36, optocoupler PC8, optocoupler PC7, optocoupler PC11, resistor R291, resistor R294, and resistor R421; The first end of the connector CN27 is connected to the first contact of the relay RY1 and the first contact of the relay RY2; The sixth end of the connector CN27 is connected to the second contact of the relay RY1, the first end of the coil of the relay RY1 is connected to the main control module, and the second end of the coil of the relay RY1 is connected to the second power supply. The seventh terminal of connector CN27 is connected to the second contact of relay RY1, the first terminal of the coil of relay RY2 is connected to the main control module, and the second terminal of the coil of relay RY2 is connected to the second power supply. The second end of the connector CN27 is connected to the second end of the optocoupler PC8, the second end of the optocoupler PC7, and the second end of the optocoupler PC11; The third terminal of connector CN27 is connected to the positive terminal of diode D31, the negative terminal of diode D31 is connected to the first terminal of optocoupler PC8, the fourth terminal of optocoupler PC8 is connected to the first power supply, the third terminal of optocoupler PC8 is connected to the first terminal of resistor R291 and the main control module, and the second terminal of resistor R291 is grounded. The fourth terminal of connector CN27 is connected to the positive terminal of diode D33, the negative terminal of diode D33 is connected to the first terminal of optocoupler PC7, the fourth terminal of optocoupler PC7 is connected to the first power supply, the third terminal of optocoupler PC7 is connected to the first terminal of resistor R294 and the main control module, and the second terminal of resistor R294 is grounded. The fifth terminal of connector CN27 is connected to the positive terminal of diode D36, the negative terminal of diode D36 is connected to the first terminal of optocoupler PC11, the fourth terminal of optocoupler PC11 is connected to the first power supply, the third terminal of optocoupler PC11 is connected to the first terminal of resistor R421 and the main control module, and the second terminal of resistor R421 is grounded.

9. A display panel, characterized by Applied to an outdoor unit of an air conditioner, the display panel includes the display circuit as described in any one of claims 1 to 8.

10. An air conditioner characterized by comprising: The air conditioner includes an indoor unit and an outdoor unit, and the outdoor unit is provided with a display panel as described in claim 9.

Images