An outdoor unit control board and a multi-split air conditioning system

Abstract

This application relates to the field of air conditioning technology, and discloses an outdoor unit control board and a multi-split air conditioning system. The outdoor unit control board includes: a controller, a communication board, a communication module, an electronic expansion valve drive module, and a data acquisition module. The controller communicates with each indoor unit through the communication board; the controller communicates with an external wired controller through the communication module; one end of the electronic expansion valve drive module is connected to the electronic expansion valve of each indoor unit, and the controller is connected to the other end of the electronic expansion valve drive module; one end of the data acquisition module is connected to each temperature sensor and switch of the multi-split air conditioning system, and the controller is connected to the other end of the data acquisition module. The outdoor unit control board of this application has simple wiring, can achieve isolated communication with multiple indoor units, realize the drive of the electronic expansion valve, and acquire temperature data and switch status, allowing users to debug via an external wired controller.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an outdoor unit control board and a multi-split air conditioning system. Background Technology

[0002] In modern air conditioning systems, especially multi-split air conditioning systems, the outdoor unit serves as the control and power core of the entire system. Currently, the outdoor unit uses a single electronic expansion valve control method, which is insufficient to meet the different cooling / heating load requirements of multiple indoor units operating simultaneously. When the outdoor unit interacts with data, it is limited by the serial port resources of the main control chip, making it difficult to achieve time-sharing communication between one main control serial port and multiple slave devices or indoor units. This leads to problems such as complex wiring, wasted resources, and frequent communication conflicts. Utility Model Content

[0003] In view of this, the embodiments of this application provide an outdoor unit control board and a multi-split air conditioning system, which can effectively solve problems such as complex outdoor unit wiring and frequent communication conflicts.

[0004] In a first aspect, embodiments of this application provide an outdoor unit control board, applied to a multi-split air conditioning system, the multi-split air conditioning system including an outdoor unit and multiple indoor units, the outdoor unit control board being disposed in the outdoor unit, the outdoor unit control board including: a controller, a communication board, a communication module, an electronic expansion valve drive module, and a data acquisition module;

[0005] The controller is used to communicate with each of the indoor units via the communication board;

[0006] The controller is also used to communicate with an external wired controller via the communication module;

[0007] One end of the electronic expansion valve drive module is connected to the electronic expansion valve of each indoor unit, and the controller is also used to connect to the other end of the electronic expansion valve drive module.

[0008] One end of the data acquisition module is connected to each temperature sensor and switch of the multi-split air conditioning system, and the controller is also used to connect to the other end of the data acquisition module.

[0009] In a first possible embodiment of the first aspect, the communication board includes a communication channel extension chip and multiple isolated communication circuits;

[0010] The first end of the communication channel expansion chip is connected to the communication channel switching pin of the controller, the second end of the communication channel expansion chip is connected to the first data transmission end and the second data transmission end of each of the isolated communication circuits, the third end of the communication channel expansion chip is connected to the data receiving pin and the data sending pin of the controller, and the third data transmission end of each of the isolated communication circuits is connected to each of the indoor units.

[0011] The first data transmission terminal is the data sending terminal of the controller, the second data transmission terminal is the data receiving terminal of the controller, and the third data transmission terminal is the data transmission terminal of the indoor unit.

[0012] In a second possible embodiment of the first aspect, the communication module includes an RS485 communication circuit;

[0013] The data receiving pin, enable signal pin, and data transmitting pin of the RS485 communication circuit are all connected to the controller. The differential signal transmission pin of the RS485 communication circuit is connected to the communication bus. The communication connection terminal of the RS485 communication circuit is connected to the external wired controller.

[0014] In a third possible embodiment of the first aspect, the electronic expansion valve drive module includes an electronic expansion valve drive chip;

[0015] The input signal receiving pin of the electronic expansion valve driver chip is connected to the electronic expansion valve control pin of the controller, and the output pin of the electronic expansion valve driver chip is connected to the electronic expansion valve and relay of each indoor unit.

[0016] In a fourth possible embodiment of the first aspect, the data acquisition module includes a multiplexer, multiple temperature sensor interface sub-circuits, and multiple switch interface sub-circuits;

[0017] The multiplexing pins of the multiplexer are respectively connected to each of the temperature sensor interface sub-circuits and each of the switch interface sub-circuits. The channel selection pin of the multiplexer is connected to the data gating pin of the controller, and the signal output pin of the multiplexer is connected to the data acquisition pin of the controller.

[0018] In a fifth possible embodiment of the first aspect, each of the isolated communication circuits includes a high-voltage side sub-circuit, an opto-isolation sub-circuit, and a low-voltage side sub-circuit;

[0019] The first end of the high-voltage side sub-circuit is connected to the indoor unit, the second end of the high-voltage side sub-circuit is connected to the first end of the opto-isolation sub-circuit, the second end of the opto-isolation sub-circuit is connected to the low-voltage side sub-circuit, and the low-voltage side sub-circuit is connected to the controller.

[0020] In a sixth possible embodiment of the first aspect, it further includes: an indoor unit switch detection circuit, the indoor unit switch detection circuit including a plurality of switches;

[0021] The controller is also used to connect to the indoor unit switch detection circuit to obtain the switching signals of each switch in the indoor unit switch detection circuit.

[0022] In a seventh possible embodiment of the first aspect, a high / low voltage detection circuit is also included;

[0023] The controller is also used to connect to the high-voltage signal output interface and the low-voltage signal output interface of the high-voltage and low-voltage detection circuit respectively, so as to receive the high-voltage signal and low-voltage signal of the multi-split air conditioning system.

[0024] In an eighth possible embodiment of the first aspect, a water pump drive circuit is also included;

[0025] The water pump drive signal pin of the controller is connected to the signal input pin of the water pump drive circuit, and the water pump feedback pin of the water pump drive circuit is connected to the feedback input pin of the controller.

[0026] Secondly, this application provides a multi-split air conditioning system, which includes an outdoor unit and multiple indoor units, wherein the outdoor unit includes the aforementioned outdoor unit control board.

[0027] The embodiments of this application have the following beneficial effects:

[0028] This embodiment presents an outdoor unit control board applied to a multi-split air conditioning system. The multi-split air conditioning system includes an outdoor unit and multiple indoor units. The outdoor unit control board is located within the outdoor unit and includes: a controller, a communication board, a communication module, an electronic expansion valve drive module, and a data acquisition module. The controller communicates with each indoor unit via the communication board and also communicates with an external wired controller via the communication module. One end of the electronic expansion valve drive module is connected to the electronic expansion valve of each indoor unit, and the controller also connects to the other end of the electronic expansion valve drive module. One end of the data acquisition module is connected to each temperature sensor and switch in the multi-split air conditioning system, and the controller also connects to the other end of the data acquisition module. Based on the above solution, the outdoor unit control board of this application has simple wiring, can achieve isolated communication with multiple indoor units, allows users to remotely debug the multi-split air conditioning system via an external wired controller, improves the user's operability and manageability of the system, and enables independent adjustment of the electronic expansion valves of each indoor unit. It can also acquire real-time temperature and switch status data of the multi-split air conditioning system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This paper shows a schematic diagram of a first structure of the outdoor unit control board according to an embodiment of this application;

[0031] Figure 2 A second structural schematic diagram of the outdoor unit control board according to an embodiment of this application is shown;

[0032] Figure 3 A circuit diagram of a controller according to an embodiment of this application is shown;

[0033] Figure 4 A circuit diagram of a communication channel extension chip according to an embodiment of this application is shown;

[0034] Figure 5 A circuit diagram of an isolated communication circuit according to an embodiment of this application is shown;

[0035] Figure 6 A circuit diagram of a communication module according to an embodiment of this application is shown;

[0036] Figure 7 This paper shows a circuit diagram of an electronic expansion valve drive module according to an embodiment of the present application;

[0037] Figure 8 A circuit diagram of a data acquisition module according to an embodiment of this application is shown;

[0038] Figure 9 This paper shows a circuit diagram of an indoor unit switch detection circuit according to an embodiment of the present application;

[0039] Figure 10 A circuit diagram of a high and low voltage detection circuit according to an embodiment of this application is shown;

[0040] Figure 11 A circuit diagram of a water pump drive circuit according to an embodiment of this application is shown;

[0041] Figure 12 A circuit diagram of a multi-split air conditioning system according to an embodiment of this application is shown.

[0042] Explanation of key component symbols:

[0043] 100 - Outdoor unit control board; 110 - Controller; 120 - Communication board; 121 - Isolation communication circuit; 1211 - High voltage side sub-circuit; 1212 - Opto-isolation sub-circuit; 1213 - Low voltage side sub-circuit; 130 - Communication module; 140 - Electronic expansion valve drive module; 150 - Data acquisition module; 151 - Multiplexer; 152 - Temperature sensor interface sub-circuit; 153 - Switch interface sub-circuit; 160 - Indoor unit switch detection circuit; 170 - High and low voltage detection circuit; 180 - Water pump drive circuit; 200 - Multi-split air conditioning system; 210 - Outdoor unit; 220 - Indoor unit. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0045] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0047] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0048] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] Please refer to Figure 1 This is a schematic diagram of an outdoor unit control board 100 provided in an embodiment of this application. Exemplarily, the outdoor unit control board 100 is applied to a multi-split air conditioning system 200, which includes an outdoor unit 210 and multiple indoor units 220. The outdoor unit control board 100 is disposed in the outdoor unit 210 and includes: a controller 110, a communication board 120, a communication module 130, an electronic expansion valve drive module 140, and a data acquisition module 150.

[0050] In this embodiment, the controller 110 is used to communicate with each indoor unit 220 via the communication board 120 to achieve centralized control and status monitoring of each indoor unit 220. The controller 110 is also used to communicate with an external wired controller via the communication module 130. Users can input control commands through the external wired controller for debugging, and the controller 110 is used to receive the control commands input by the user via the communication module 130. One end of the electronic expansion valve drive module 140 is connected to the electronic expansion valve of each indoor unit 220, and the controller 110 is also used to connect to the other end of the electronic expansion valve drive module 140 to control the electronic expansion valve of each indoor unit 220. One end of the data acquisition module 150 is connected to each temperature sensor and switch of the multi-split air conditioning system, and the controller 110 is also used to connect to the other end of the data acquisition module to acquire temperature data and switch status data of the multi-split air conditioning system 200. The temperature data includes, but is not limited to, the exhaust temperature of the outdoor unit 210, the coil temperature of each indoor unit 220, the outdoor ambient temperature, and the indoor ambient temperature. The switch status data includes, but is not limited to, the switch status of the indoor unit 220, the switch status of the outdoor unit 210, the open / closed status of the electronic expansion valve, and the start / stop status of the compressor.

[0051] In one embodiment, such as Figure 2 As shown, the outdoor unit control board 100 also includes an indoor unit switch detection circuit 160. Exemplarily, the indoor unit switch detection circuit 160 includes multiple switches; the controller 110 is also used to connect to the indoor unit switch detection circuit 160 to obtain the switch signals of each switch in the indoor unit switch detection circuit 160. The switches are used to control the connection of the indoor unit 220. In this embodiment, by reading the switch signals of each switch, the controller 110 can determine in real time whether each indoor unit 220 has been connected to the multi-split air conditioning system 200, which helps the multi-split air conditioning system 200 quickly identify the switch status of the indoor unit 220 before or during operation, avoiding invalid control or misoperation.

[0052] In one embodiment, the outdoor unit control board 100 further includes a high / low pressure detection circuit 170. Exemplarily, the controller 110 is also configured to connect to the high-pressure signal output interface and the low-pressure signal output interface of the high / low pressure detection circuit 170, respectively, to receive high-pressure and low-pressure signals from the multi-split air conditioning system 200. In this embodiment, the controller 110 can determine whether the multi-split air conditioning system 200 is operating normally and detect whether there are problems such as high-pressure overload or low-pressure insufficiency through the high-pressure and low-pressure signals.

[0053] In another embodiment, the outdoor unit control board 100 further includes a water pump drive circuit 180. Exemplarily, the water pump drive signal pin of the controller 110 is connected to the signal input pin of the water pump drive circuit 180, and the water pump feedback pin of the water pump drive circuit 180 is connected to the feedback input pin of the controller 110. In this embodiment, the controller 110 controls the start / stop or speed adjustment of the water pump by outputting a water pump drive signal to meet different operating conditions. Through the water pump feedback pin, the controller can obtain the water pump operating status, such as whether the current is abnormal, whether there is a stall, or whether there is an open circuit.

[0054] To better understand the outdoor unit control board 100, the following is a detailed description of each component of the outdoor unit control board 100.

[0055] In one embodiment, the controller 110 can be an integrated circuit chip with signal processing capabilities. The controller 110 includes, but is not limited to, devices such as microcontroller units (MCUs) and single-chip microcomputers. For example, Figure 3 A circuit diagram of a controller 110 according to an embodiment of this application is shown.

[0056] In one embodiment, the controller 110 includes communication channel switching pins 4052A and 4052B, and the communication board 120 includes a communication channel expansion chip IC16 and multiple isolated communication circuits 121. Exemplarily, such as... Figure 4As shown, the first terminal of the communication channel expansion chip IC16 is connected to the communication channel switching pins 4052A and 4052B. The second terminal of the communication channel expansion chip IC16 is connected to the first data transmission terminal S1_TX and the second data transmission terminal S1_RX of each isolated communication circuit 121. The third terminal of the communication channel expansion chip IC16 is connected to the data receiving pin 4052Y and the data transmitting pin 4052X of the controller 110. The third data transmission terminal of each isolated communication circuit 121 is connected to each indoor unit 220. The first data transmission terminal is the data transmitting terminal of the controller 110, the second data transmission terminal is the data receiving terminal of the controller 110, and the third data transmission terminal is the data transmission terminal of the indoor unit 220. For example, when the level of the communication channel switching pin 4052B is low and the level of 4052A is low, 4052X is connected to S1_TX, and 4052Y is connected to S1_RX, so as to realize the communication between the controller 110 and the indoor unit 220 corresponding to the third data transmission terminal S1.

[0057] In one implementation, such as Figure 5 As shown, each isolated communication circuit 121 includes a high-voltage side sub-circuit 1211, an opto-isolation sub-circuit 1212, and a low-voltage side sub-circuit 1213. The first terminal of the high-voltage side sub-circuit 1211 is connected to the indoor unit 220, the second terminal of the high-voltage side sub-circuit 1211 is connected to the first terminal of the opto-isolation sub-circuit 1212, the second terminal of the opto-isolation sub-circuit 1212 is connected to the low-voltage side sub-circuit 1213, and the low-voltage side sub-circuit 1213 is connected to the controller 110.

[0058] In this embodiment, the high-voltage side sub-circuit 1211 includes: transient voltage suppressor (TVS) diodes Z1 and Z2, used to suppress surge voltage and protect downstream circuits; a thermistor PTC1, used for current limiting protection when resistance increases suddenly during overcurrent; a capacitor C141, used to filter AC noise and isolate DC; a resistor R258; and a diode D35, used for clamping or rectification to regulate signal polarity. The opto-isolation sub-circuit 1212 includes: opto-isolation optocouplers PC15 and PC16. Opto-isolation optocoupler PC15 receives high-voltage side signals, i.e., signals from the indoor unit 220 side, and is internally conductive, transmitting the signal to the low-voltage side. Opto-isolation optocoupler PC16 receives low-voltage side signals, i.e., data transmission signals from the controller 110 side, and transmits the signal to the low-voltage side, ensuring bidirectional signal isolation communication. The low-voltage side sub-circuit 1213 includes: current-limiting resistors R259, R260, R261, R263, and R264, used to set the bias of transistor Q16 to ensure signal stability; filter capacitor C148; and transistor Q16, used to drive the signal transmission circuit of the data transmission end of controller 110.

[0059] In one embodiment, such as Figure 6 As shown, the communication module 130 includes an RS485 communication circuit. Exemplarily, the RS485 communication circuit's data receive pin ( Figure 6 The TXD2 pin shown is the enable signal pin. Figure 6 DE2 shown) and data transmission pin ( Figure 6 The RXD2 shown is connected to the controller 110, and the differential signal transmission pin of the RS485 communication circuit ( Figure 6 A2 and B2 (as shown) are connected to the communication bus, and the communication connection terminal of the RS485 communication circuit ( Figure 6 Bin2 and Ain2 (as shown) are connected to an external wired controller.

[0060] In one embodiment, the RS485 communication circuit includes: an RS485 transceiver chip for converting TTL (Transistor-Transistor Logic) levels to RS485 differential levels. The RS485 transceiver chip includes: a data transmit pin RO for converting RS485 differential signals on the bus to TTL levels and transmitting them to the controller 110; enable signal pins RE and DE for receiving enable signals sent by the controller 110 and controlling the transmit / receive state of the RS485 transceiver chip; a data receive pin DI for receiving data transmit signals from the controller 110, converting them into differential signals, and sending them to the bus; and differential signal transmission pins A and B, where A is the positive terminal and B is the negative terminal, for connecting to the communication bus and transmitting differential signals to prevent interference. The RS485 communication circuit also includes: current-limiting resistors R71, R73, R151, R152, R153, and R77; pull-up resistor R154 and pull-down resistor R155 to ensure stable bus level when idle; filter capacitors C35, C97, C98, C69, C81, and C94; and communication connection terminals Ain2 and Bin2, which can be used to connect an external wired controller. The RS485 communication circuit is used to realize data transmission and reception control, and to complete the command and status interaction between the controller 110 and the wired controller.

[0061] In one embodiment, such as Figure 7 As shown, the electronic expansion valve drive module 140 includes an electronic expansion valve drive chip IC10. The input signal receiving pin of the electronic expansion valve drive chip (… Figure 7 The 1IN~71IN pins shown are connected to the electronic expansion valve control pins of controller 110. Figure 7 As shown in OUT4~EVO13), the output pins of the electronic expansion valve driver chip ( Figure 7 The 1OUT~7OUT pins shown connect to the electronic expansion valve and electronic expansion valve relay of each indoor unit 220. In this embodiment, the output pin of the electronic expansion valve driver chip can be connected to a connector (…). Figure 7 As shown in CN3, this connector is used to connect the electronic expansion valve, enabling the detachment and connection of the electronic expansion valve driver chip and the electronic expansion valve.

[0062] In one embodiment, the data acquisition module 150 includes a multiplexer 151, multiple temperature sensor interface sub-circuits 152, and multiple switch interface sub-circuits 153. The multiplexing pins of the multiplexer 151 are respectively connected to each temperature sensor interface sub-circuit 152 and each switch interface sub-circuit 153, and the channel selection pins of the multiplexer 151 are connected to the data selection pins of the controller 110 (e.g., ...). Figure 3 and Figure 8 As shown in A, B, and C), the signal output pins of multiplexer 151 are connected to the data acquisition pins of controller 110 (e.g., A, B, and C). Figure 3 and 8 (TM-COM-1 shown).

[0063] In one implementation, such as Figure 8 As shown, the multiplexer 151 can be an 8-to-1 analog switch chip (such as...) Figure 8 IC11 (shown) is used for time-division multiplexing of 8 inputs to reduce pin usage. The multiplexer 151's multiplexing pins X0~X7 connect to each temperature sensor interface sub-circuit 152 and each switch interface sub-circuit 153, covering temperature sensors (such as…). Figure 8 The signals shown are T5, T6, T7, T8, T9, T10, and T11, and the switching signals (such as...). Figure 8 (IN5 shown). The channel selection pins A, B, and C of the multiplexer 151 are 3-bit binary channel selection terminals, which are connected to the controller 110 to select one of the temperature sensor or switch signals. The common output terminal X of the multiplexer 151 is connected to the data acquisition pin of the controller 110, and the controller 110 receives the selected temperature sensor signal or switch signal.

[0064] In another embodiment, each temperature sensor interface sub-circuit 152 includes: a pull-up resistor R164, where the temperature sensor (such as a thermistor) typically has a resistive output; after being pulled up, the resistance change is converted into a voltage signal for the controller 110 to perform ADC (Analog-to-Digital Converter) detection; a current-limiting resistor R175 and a filter capacitor C24; a bidirectional diode D18 for transient voltage suppression to prevent surges and electrostatic discharge from damaging the circuit; and T11 for the temperature sensor. Each switch interface sub-circuit 153 includes: a pull-up resistor R168 to ensure that the signal is high when the switch is open, ensuring logic stability; a resistor R135 and a capacitor C90 forming an RC filter to filter out switch bounce or electromagnetic interference; and IN1 for the switch.

[0065] In one embodiment, such as Figure 9 As shown, the indoor unit switch detection circuit 160 includes: SW1, SW2, SW3 and SW4 are four-way switches, including 4 sets of contacts. When the switch is pressed, the corresponding channels SW1~SW4 are grounded; RP1 is a resistor array, including 4 pull-up resistors, which provide a high level for SW1~SW4 respectively. When the switch is not pressed, the signal is VCC; filter capacitors C16~C19 are used to eliminate switch bounce or noise and stabilize the signal.

[0066] In this embodiment, when the switch is not pressed, it is in the open state, and the resistor array RP1 pulls the SW1~SW4 signals to VCC, i.e., a high level. When the switch is pressed, it is in the closed state, and the resistor array RP1 grounds the SW1~SW4 signals through the switch, making them low level. The controller 110 determines whether the corresponding switch is pressed by detecting the level changes of SW1~SW4, thus realizing button input.

[0067] In one embodiment, such as Figure 10 As shown, the high and low voltage detection circuit 170 includes: connector CN10 for connecting high and low voltage sensors or high and low voltage switches; bidirectional clamping diodes D19 and D20 for suppressing surge voltage and protecting subsequent circuits; resistors R162, R163, R41, and R38 for current limiting and voltage division, stabilizing signal levels, and matching the input range of controller 110; filter capacitors C36 and C37 for eliminating signal noise and preventing false triggering; high voltage signal output interface HP-1 for connecting controller 110; and low voltage signal output interface LP-1 for connecting controller 110.

[0068] In this embodiment, the voltage change of the high and low voltage sensor or the high and low voltage switch is conditioned (e.g., clamped, filtered, voltage divided) by the high and low voltage detection circuit 170, and then outputs a level / voltage signal to the controller 110 through the high voltage signal output interface HP-1 to determine whether the high voltage exceeds the limit (e.g., overvoltage), and outputs a level / voltage signal to the controller 110 through the low voltage signal output interface LP-1 to determine whether the low voltage exceeds the limit (e.g., undervoltage).

[0069] In one embodiment, such as Figure 11As shown, the water pump drive circuit 180 includes a power supply terminal VCC to ensure circuit operation. The water pump drive circuit 180 includes TVS diodes D31 and D32, which are used to suppress surge voltage and reverse voltage in the circuit, protecting it. C130 and C135 are filter capacitors used to filter out power supply noise and stabilize signals in the circuit. Transistors Q9, Q11, and Q12 form a cascaded amplifier circuit to enhance the driving capability of the water pump drive signal of the controller 110. The water pump drive signal can be a PWM signal used to control the water pump speed. The water pump drive circuit 180 transmits the amplified PWM signal to the water pump, adjusting the pump speed through the duty cycle. CN2 is an input interface used to receive the water pump feedback signal and the water pump drive signal; the water pump feedback signal can be a water pump speed feedback signal. In this embodiment, the PWM signal output by the controller 110 is amplified by cascaded transistors to drive the water pump speed regulation; at the same time, the water pump speed feedback signal is sent back to the controller 110 to form a closed-loop control, monitor the actual speed of the water pump, correct the PWM duty cycle, and ensure accurate speed regulation.

[0070] This application also provides a multi-split air conditioning system 200, exemplary, such as Figure 12 As shown, the multi-split air conditioning system 200 includes an outdoor unit 210 and multiple indoor units 220. The outdoor unit 210 includes the outdoor unit control board 100 described in the above embodiment. Since the multi-split air conditioning system 200 in this embodiment uses the outdoor unit control board 100, it has all the advantages of the outdoor unit control board 100 described above. It is understood that the options in the above embodiments are also applicable to this embodiment, so they will not be described again here.

[0071] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that, as an alternative implementation, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0072] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0073] If a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An outdoor unit control board, characterized by, This invention is applied to a multi-split air conditioning system, which includes an outdoor unit and multiple indoor units. The outdoor unit control board is located in the outdoor unit and includes: a controller, a communication board, a communication module, an electronic expansion valve drive module, and a data acquisition module. The controller is used to communicate with each of the indoor units via the communication board; The controller is also used to communicate with an external wired controller via the communication module; One end of the electronic expansion valve drive module is connected to the electronic expansion valve of each indoor unit, and the controller is also used to connect to the other end of the electronic expansion valve drive module. One end of the data acquisition module is connected to each temperature sensor and switch of the multi-split air conditioning system, and the controller is also used to connect to the other end of the data acquisition module.

2. The outdoor unit control board according to claim 1, characterized in that, The communication board includes a communication channel expansion chip and multiple isolated communication circuits; The first end of the communication channel expansion chip is connected to the communication channel switching pin of the controller, the second end of the communication channel expansion chip is connected to the first data transmission end and the second data transmission end of each of the isolated communication circuits, the third end of the communication channel expansion chip is connected to the data receiving pin and the data sending pin of the controller, and the third data transmission end of each of the isolated communication circuits is connected to each of the indoor units. The first data transmission terminal is the data sending terminal of the controller, the second data transmission terminal is the data receiving terminal of the controller, and the third data transmission terminal is the data transmission terminal of the indoor unit.

3. The outdoor unit control board according to claim 1, characterized in that, The communication module includes an RS485 communication circuit; The data receiving pin, enable signal pin, and data transmitting pin of the RS485 communication circuit are all connected to the controller. The differential signal transmission pin of the RS485 communication circuit is connected to the communication bus. The communication connection terminal of the RS485 communication circuit is connected to the external wired controller.

4. The outdoor unit control board according to claim 1, characterized in that, The electronic expansion valve drive module includes an electronic expansion valve drive chip. The input signal receiving pin of the electronic expansion valve driver chip is connected to the electronic expansion valve control pin of the controller, and the output pin of the electronic expansion valve driver chip is connected to the electronic expansion valve and relay of each indoor unit.

5. The outdoor unit control board according to claim 1, characterized in that, The data acquisition module includes a multiplexer, multiple temperature sensor interface sub-circuits, and multiple switch interface sub-circuits. The multiplexing pins of the multiplexer are respectively connected to each of the temperature sensor interface sub-circuits and each of the switch interface sub-circuits. The channel selection pin of the multiplexer is connected to the data gating pin of the controller, and the signal output pin of the multiplexer is connected to the data acquisition pin of the controller.

6. The outdoor unit control board according to claim 2, characterized in that, Each of the isolated communication circuits includes a high-voltage side sub-circuit, an opto-isolation sub-circuit, and a low-voltage side sub-circuit; The first end of the high-voltage side sub-circuit is connected to the indoor unit, the second end of the high-voltage side sub-circuit is connected to the first end of the opto-isolation sub-circuit, the second end of the opto-isolation sub-circuit is connected to the low-voltage side sub-circuit, and the low-voltage side sub-circuit is connected to the controller.

7. The outdoor unit control board according to claim 1, characterized in that, Also includes: An indoor unit switch detection circuit, which includes multiple switches; The controller is also used to connect to the indoor unit switch detection circuit to obtain the switching signals of each switch in the indoor unit switch detection circuit.

8. The outdoor unit control board according to claim 1, characterized in that, Also includes: High and low voltage detection circuit; The controller is also used to connect to the high-voltage signal output interface and the low-voltage signal output interface of the high-voltage and low-voltage detection circuit respectively, so as to receive the high-voltage signal and low-voltage signal of the multi-split air conditioning system.

9. The outdoor unit control board according to claim 1, characterized in that, Also includes: Water pump drive circuit; The water pump drive signal pin of the controller is connected to the signal input pin of the water pump drive circuit, and the water pump feedback pin of the water pump drive circuit is connected to the feedback input pin of the controller.

10. A multi-split air conditioning system, characterized in that, The multi-split air conditioning system includes an outdoor unit and multiple indoor units, wherein the outdoor unit includes an outdoor unit control board as described in any one of claims 1-9.

Images