Air conditioner

Abstract

The invention relates to an air conditioner which comprises a control end unit circuit, a fan communication unit circuit, a fan driving unit circuit, a power supply control unit circuit and a fan. Wherein the fan communication unit circuit comprises a first communication branch circuit and a second communication branch circuit, the first communication branch circuit and the second communication branch circuit are both connected between the control end unit circuit and the fan driving unit circuit, the power supply control unit circuit is further connected with the first communication branch circuit, and the first communication branch circuit comprises a first optocoupler. The second communication branch comprises a second optocoupler, the first optocoupler and the second optocoupler are both connected between the control end unit circuit and the fan driving unit circuit, and one side, connected with the fan driving unit circuit, of the first optocoupler is connected with the power supply control unit circuit. Therefore, the number of the optocouplers is reduced, the layout flexibility of the circuit board is improved, and the use reliability of the air conditioner is improved.

Description

Technical Field

[0001] This application relates to the field of temperature control equipment technology, and in particular to an air conditioner. Background Technology

[0002] In air conditioning systems, the power supply conditions for each component may differ to ensure proper operation. For example, the human-machine interface requires a low-voltage connection, while the fan drive requires a high-voltage connection to power the fan. Therefore, two optocouplers are needed in the two fan communication circuits between them to isolate the high and low voltage signals. Furthermore, an optocoupler is also required between the fan power supply circuit and the fan itself to ensure safe operation of the air conditioner.

[0003] However, an excessive number of optocouplers increases the number of connecting wires and the complexity of wiring, requires a larger volume, and is not conducive to various circuit board layouts, resulting in poor flexibility of use. Therefore, traditional air conditioners have low reliability. Summary of the Invention

[0004] Therefore, it is necessary to address the technical problem of poor flexibility in the use of traditional air conditioners by providing an air conditioner that can improve its flexibility.

[0005] This application provides an air conditioner, including:

[0006] The control unit circuit outputs control signals based on received user commands or sensor signals.

[0007] The wind turbine communication unit circuit connects the control terminal unit circuit and the wind turbine drive unit circuit, and is used to transmit the control signal to the wind turbine drive unit circuit.

[0008] The fan drive unit circuit is connected to the fan and controls the operation of the fan based on the control signal.

[0009] The power control unit circuit is connected to the fan drive unit circuit and the fan, and supplies power to the fan drive unit circuit and the fan;

[0010] The fan, when in operation, drives airflow and performs heat exchange;

[0011] The wind turbine communication unit circuit includes a first communication branch and a second communication branch. Both the first communication branch and the second communication branch are connected between the control terminal unit circuit and the wind turbine drive unit circuit. The power control unit circuit is also connected to the first communication branch.

[0012] The first communication branch includes a first optocoupler, and the second communication branch includes a second optocoupler. Both the first optocoupler and the second optocoupler are connected between the control terminal unit circuit and the fan drive unit circuit. The side of the first optocoupler connected to the fan drive unit circuit is connected to the power control unit circuit.

[0013] Therefore, only two optocouplers are needed in the air conditioner to perform heat exchange normally, reducing the number of optocouplers and connecting wires, saving operating costs, increasing the flexibility of circuit board layout, and thus improving the reliability of the air conditioner.

[0014] In one embodiment, the first communication branch further includes a first resistor and a second resistor;

[0015] The first end of the first side of the first optocoupler is connected to the first end of the second resistor and the first power supply, the second end of the first side of the first optocoupler is connected to the second end of the second resistor and the second end of the first resistor, and the first end of the first resistor is connected to the control terminal unit circuit.

[0016] The first end of the second side of the first optocoupler is connected to the wind turbine drive unit circuit, the power control unit circuit, and the second power supply, and the second end of the second side of the first optocoupler is grounded.

[0017] Based on this, the first resistor can limit current and protect the circuit, while the second resistor can bias the circuit to ensure the first optocoupler functions properly. The first communication branch, combining the first resistor, the second resistor, and the first optocoupler structure, enables the normal transmission of signals from the control unit circuit to the fan drive unit circuit and the power control unit circuit, thus facilitating the normal operation of the air conditioner.

[0018] In one embodiment, the air conditioner further includes an optocoupler protection circuit connected to the first optocoupler to protect it. Therefore, providing an optocoupler protection circuit connected to the first optocoupler helps ensure that the first optocoupler operates within safe parameter ranges, extending its lifespan and improving reliability.

[0019] In one embodiment, the optocoupler protection circuit includes a first diode, a second diode, a third resistor, and a fourth resistor;

[0020] The anode of the first diode is connected to the first terminal of the second side of the first optocoupler, and the cathode of the first diode is connected to the second power supply.

[0021] The cathode of the second diode is connected to the first end of the second side of the first optocoupler, the anode of the second diode is connected to the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected to the first power supply, and the second end of the fourth resistor is connected to the fan drive unit circuit.

[0022] Based on this, current limiting protection and clamping protection can be applied to the first optocoupler to reduce the impact of excessive current or voltage on the first optocoupler, which is beneficial to improving the working performance of the first optocoupler.

[0023] In one embodiment, the air conditioner further includes a third diode, the cathode of which is connected to a first terminal on a second side of the first optocoupler, and the anode of which is connected to the power control unit circuit.

[0024] Therefore, the third diode can ensure that the normal communication of the wind turbine is not affected by the back-end power supply, which helps to improve the effectiveness of communication.

[0025] In one embodiment, the power control unit circuit includes a first switching transistor, a fifth resistor, a sixth resistor, and a power chip;

[0026] The first end of the fifth resistor is connected to the first end of the second side of the first optocoupler, the second end of the fifth resistor is connected to the control end of the first switching transistor and the second end of the sixth resistor, the first end of the first switching transistor is connected to the first end of the sixth resistor and the second power supply, the second end of the first switching transistor is connected to the input end of the fan and the power chip, and the output end of the power chip is connected to the first power supply and the fan drive unit circuit.

[0027] Therefore, based on the different conduction states of the first optocoupler, the conduction state of the first switching transistor is also different, thus enabling quick and convenient control of the power supply and de-energization states of the fan, power chip, and fan drive unit circuit.

[0028] In one embodiment, the power control unit circuit further includes a fourth diode, a first capacitor, a second capacitor, and a third capacitor;

[0029] The anode of the fourth diode is connected to the second terminal of the first switching transistor, the cathode of the fourth diode is connected to the first terminal of the first switching transistor, the first terminal of the first capacitor is connected to the input terminal of the power chip, the second terminal of the first capacitor is grounded, the first terminal of the second capacitor is connected to the output terminal of the power chip, the second terminal of the second capacitor is grounded, the first terminal of the third capacitor is connected to the output terminal of the power chip, and the second terminal of the third capacitor is grounded.

[0030] Therefore, the fourth diode can protect the first switching transistor, and the first, second, and third capacitors can improve signal quality, thus comprehensively improving the working performance of the air conditioner.

[0031] In one embodiment, the air conditioner further includes a power supply maintenance circuit, which is connected to the fan drive unit circuit and the power control unit circuit.

[0032] The fan drive unit circuit is used to control the power control unit circuit to be in a power supply state by controlling the conduction state of the power supply maintenance circuit during operation.

[0033] Through the power supply maintenance circuit, the fan drive unit circuit can control the source control unit circuit to be in a power supply state, so that the fan drive unit circuit can be continuously and normally powered, and can also maintain the power supply state of the fan.

[0034] In one embodiment, the power supply sustaining circuit includes a second switch, a seventh resistor, and an eighth resistor;

[0035] The control terminal of the second switching transistor is connected to the fan drive unit circuit through the seventh resistor. The first terminal of the eighth resistor is connected to the control terminal of the second switching transistor, the second terminal of the eighth resistor is connected to the first terminal of the second switching transistor and grounded, and the second terminal of the second switching transistor is connected to the power control unit circuit.

[0036] Therefore, the fan drive unit circuit can control the power supply maintenance circuit to maintain the power supply state by adjusting the signal sent to the control terminal of the second switching transistor, so that the power supply maintenance circuit can provide stable power and improve the working stability of the air conditioner.

[0037] In one embodiment, the second communication branch further includes a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor;

[0038] The first end of the first side of the second optocoupler is connected to the first power supply through the eleventh resistor and to the first end of the twelfth resistor. The second end of the first side of the second optocoupler is connected to the second end of the twelfth resistor and to the fan drive unit circuit.

[0039] The first end of the second side of the second optocoupler is connected to the second end of the ninth resistor and the second end of the tenth resistor. The first end of the ninth resistor is connected to the first power supply, and the first end of the tenth resistor is connected to the control terminal unit circuit. The second end of the second side of the second optocoupler is grounded.

[0040] Based on the above structure, the control unit circuit can communicate with the fan drive unit circuit and receive the signals output by the fan drive unit circuit.

[0041] The aforementioned air conditioner includes a control unit circuit, a fan communication unit circuit, a fan drive unit circuit, a power control unit circuit, and a fan. The control unit circuit outputs control signals based on received user commands or sensor signals. The fan communication unit circuit connects the control unit circuit and the fan drive unit circuit, transmitting the control signals to the fan drive unit circuit. The fan drive unit circuit connects to the fan and controls its operation based on the control signals. The power control unit circuit connects the fan drive unit circuit and the fan, supplying power to both. During operation, the fan propels airflow and facilitates heat exchange, thereby regulating the temperature. The fan communication unit circuit includes a first communication branch and a second communication branch, both connected between the control unit circuit and the fan drive unit circuit. The power control unit circuit is also connected to the first communication branch. The first communication branch includes a first optocoupler, and the second communication branch includes a second optocoupler. Both the first and second optocouplers are connected between the control unit circuit and the fan drive unit circuit. The side of the first optocoupler connected to the fan drive unit circuit is connected to the power control unit circuit. Therefore, only two optocouplers are needed in the air conditioner to perform heat exchange normally, reducing the number of optocouplers and connecting wires, saving operating costs, increasing the flexibility of circuit board layout, and thus improving the reliability of the air conditioner. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of an air conditioner in one embodiment;

[0044] Figure 2 This is a schematic diagram of the structure of the first communication branch in one embodiment;

[0045] Figure 3 This is a schematic diagram of the air conditioner structure in one embodiment;

[0046] Figure 4 This is a flowchart illustrating the operation of an air conditioner in one embodiment.

[0047] Figure 5 This is a timing diagram of the air conditioner's operation in one embodiment. Detailed Implementation

[0048] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0050] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0051] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0052] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0053] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0054] This application provides an air conditioner for regulating the temperature of a target area. For example... Figure 1 As shown, the main structure of the air conditioner includes a control unit circuit 10, a fan communication unit circuit 20, a fan drive unit circuit 40, a power control unit circuit 30, and a fan. The structure and operation of these components are described below:

[0055] The control unit circuit 10 outputs control signals based on received user commands or sensor signals. The control unit circuit 10 typically includes an interaction unit, a processing circuit connected to the interaction unit, and a processor connected to the processing circuit. The interaction unit receives user commands, the processing circuit generates corresponding signals based on the user commands transmitted by the interaction unit, and transmits them to the processor. The processor processes the received signals to parse the user commands. Then, the processor outputs control signals to other connected devices based on the parsed user commands to control the devices. The type of interaction unit is not unique; it can be a button, touchscreen, voice receiver, or a device that has established a communication connection with a remote control or smart terminal device. No limitation is made here.

[0056] Alternatively, the control unit circuit 10 outputs a control signal based on the received sensor signal. The sensor signal is the signal detected by a sensor connected to the control unit circuit 10. The type of sensor is not limited; for example, it can be a temperature sensor. The temperature sensor detects temperature and sends the detected temperature signal to the control unit circuit 10. The control unit circuit 10 then outputs a corresponding control signal to the device connected to it based on the received temperature signal. For example, the control unit circuit 10 compares the received temperature signal with a target temperature and outputs a corresponding control signal based on the comparison result.

[0057] The wind turbine communication unit circuit 20 connects the control terminal unit circuit 10 and the wind turbine drive unit circuit 40, and is used to transmit control signals to the wind turbine drive unit circuit 40. The wind turbine communication unit circuit 20 and the control terminal unit circuit 10 can be connected via a communication line to achieve signal transmission with the control terminal unit circuit 10. The wind turbine communication unit circuit 20 is also connected to the wind turbine drive unit circuit 40, and is used to transmit the control signals output by the control terminal unit circuit 10 to the wind turbine drive unit circuit 40.

[0058] The fan drive unit circuit 40 is connected to the fan and is used to control the fan operation based on control signals. The fan drive unit circuit 40 controls the fan operation in the following ways: The fan drive unit circuit 40 includes a switching module, which controls the on and off time of the switching module according to the control signal, thereby adjusting the current / voltage output to the fan, controlling the fan operation, adjusting the fan speed, etc.

[0059] The power control unit circuit 30 is the power supply circuit for the air conditioner, connecting the fan drive unit circuit 40 and the fan, and supplying power to the fan drive unit circuit 40 and the fan. The power control circuit can accept electrical energy, process the accepted electrical energy, and output the processed electrical energy to the devices that need power, thus achieving on-demand power supply.

[0060] Fans are used to circulate air during operation to facilitate heat exchange. The type of fan is not limited; for example, it can be a centrifugal fan or a cross-flow fan, depending on the specific needs. In air conditioning cooling, the fan pushes air through the evaporator to absorb heat; in air conditioning heating, the fan pushes air through the condenser to release heat.

[0061] Based on the above structure, an embodiment of the air conditioner in cooling mode is described below: The user sets the temperature to 24℃ via the control unit circuit 10, and the temperature sensor detects the current room temperature as 28℃. The control unit circuit 10 calculates the temperature difference and outputs a high-speed fan signal, which is transmitted to the fan drive unit circuit 40 via the fan communication unit circuit 20. The fan drive unit circuit 40 increases the fan voltage, increasing the motor speed. Subsequently, the fan pushes air at high speed through the evaporator, and the cold air diffuses through the air outlet, gradually lowering the room temperature. Expandably, the temperature sensor provides real-time data, and the control unit circuit 10 controls the fan to gradually reduce the fan speed to maintain 24℃.

[0062] Furthermore, the wind turbine communication unit circuit 20 includes a first communication branch and a second communication branch, both of which are connected between the control terminal unit circuit 10 and the wind turbine drive unit circuit 40. The power control unit circuit 30 is also connected to the first communication branch.

[0063] The first communication branch and the second communication branch are different communication branches, providing two signal transmission channels. For example, the first end of the first communication branch is connected to the control unit circuit 10, and the second end is connected to the fan drive unit circuit 40. The first communication branch is used to transmit signals sent from the control unit circuit 10 to the fan drive unit circuit 40. The first end of the second communication branch is connected to the control unit circuit 10, and the second end is connected to the fan drive unit circuit 40. The second communication branch is used to transmit signals sent from the fan drive unit circuit 40 to the control unit circuit 10.

[0064] Each of the first and second communication branches is equipped with an optocoupler, which is used to achieve strong and weak current isolation within its respective branch. Specifically, for example... Figure 2 As shown, the first communication branch includes a first optocoupler B860, which is connected between the control unit circuit 10 and the fan drive unit circuit 40. This can be understood as follows: the first side of the first optocoupler B860 is connected to the control unit circuit 10, and the second side is connected to the fan drive unit circuit 40, thereby achieving signal isolation between the control unit circuit 10 and the fan drive unit circuit 40. The signal output from the control unit circuit 10 reaches the fan drive unit circuit 40 after passing through the first optocoupler B860. The first side can be understood as the light-emitting side, and the second side as the light-receiving side.

[0065] Furthermore, one side of the first optocoupler B860 connected to the wind turbine drive unit circuit 40 is connected to the power control unit circuit 30. This connection can be understood as the second side of the first optocoupler B860. Thus, the signal output from the control unit circuit 10 passes through the first optocoupler B860 and reaches the power control unit circuit 30, thereby achieving strong and weak current isolation between the control unit circuit 10 and the power control unit circuit 30.

[0066] The second communication branch includes a second optocoupler, which is connected between the control unit circuit 10 and the fan drive unit circuit 40. This can be understood as follows: the first side of the second optocoupler is connected to the fan drive unit circuit 40, and the second side is connected to the control unit circuit 10, thereby achieving signal isolation between the control unit circuit 10 and the fan drive unit circuit 40. The signal output from the fan drive unit circuit 40 reaches the control unit circuit 10 after passing through the second optocoupler. The first side can be understood as the light-emitting side, and the second side as the light-receiving side.

[0067] The air conditioner in the above embodiment includes a control unit circuit 10, a fan communication unit circuit 20, a fan drive unit circuit 40, a power control unit circuit 30, and a fan. The control unit circuit 10 outputs a control signal according to the received user command or sensor signal. The fan communication unit circuit 20 is connected to the control unit circuit 10 and the fan drive unit circuit 40, and is used to transmit the control signal to the fan drive unit circuit 40. The fan drive unit circuit 40 is connected to the fan and controls the operation of the fan based on the control signal. The power control unit circuit 30 is connected to the fan drive unit circuit 40 and the fan, and supplies power to the fan drive unit circuit 40 and the fan. When the fan is running, it drives the air to flow and carry out heat exchange, thereby realizing the regulation of temperature. The fan communication unit circuit 20 includes a first communication branch and a second communication branch, both connected between the control unit circuit 10 and the fan drive unit circuit 40. The power control unit circuit 30 is also connected to the first communication branch. The first communication branch includes a first optocoupler B860, and the second communication branch includes a second optocoupler. Both the first and second optocouplers are connected between the control unit circuit 10 and the fan drive unit circuit 40. The side of the first optocoupler B860 connected to the fan drive unit circuit 40 is connected to the power control unit circuit 30. Therefore, only two optocouplers are used in the air conditioner, yet heat exchange can still be performed normally. This reduces the number of optocouplers and connecting wires, saves on operating costs, increases the flexibility of the circuit board layout, and thus improves the reliability of the air conditioner.

[0068] The structure of the first communication branch is not unique. In one exemplary embodiment, such as... Figure 2As shown, the first communication branch also includes a first resistor R841 and a second resistor R843.

[0069] The first end of the first side of the first optocoupler B860 ( Figure 2 Pin A of the first optocoupler B860 is connected to the first terminal of the second resistor R843 and the first power supply. Figure 2 The K pin in the circuit is connected to the second end of the second resistor R843 and the second end of the first resistor R841. The first end of the first resistor R841 is connected to the control terminal unit circuit 10.

[0070] The first end of the second side of the first optocoupler B860 ( Figure 2 The C pin in the first optocoupler B860 is connected to the fan drive unit circuit 40, the power control unit circuit 30, and the second power supply. The second terminal on the second side of the first optocoupler B860 is connected to the second terminal on the second side of the first optocoupler B860. Figure 2 The E pin in the circuit is grounded.

[0071] In this circuit, the first resistor R841 serves as a current-limiting resistor, limiting the current and protecting the circuit. The control signal from the control unit circuit 10 passes through the first resistor R841 to the second terminal of the first side of the first optocoupler B860, which is connected to the first power supply. The first terminal of R843 is connected to the first terminal of the first side of the first optocoupler B860, and the second terminal of the second resistor R843 is connected to the second terminal of the first side of the first optocoupler B860. The second resistor R843 is a bias resistor. The voltage of the first power supply is not limited; for example, it can be 5V.

[0072] If the control signal sent by the control unit circuit 10 is high level, the first side of the first optocoupler B860 is not conducting, and the second side of the first optocoupler B860 is also not conducting. The first terminal of the second side of the first optocoupler B860 is high level, and the fan drive unit circuit 40 and the power control unit circuit 30 receive the high level output by the control unit circuit 10.

[0073] If the control signal sent by the control unit circuit 10 is low, the first side of the first optocoupler B860 is turned on, and the second side of the first optocoupler B860 is also turned on. If the first terminal of the second side of the first optocoupler B860 is low, the fan drive unit circuit 40 and the power control unit circuit 30 will receive the low level output by the control unit circuit 10.

[0074] In this embodiment, the first communication branch also includes a first resistor R841 and a second resistor R843. The first end of the first side of the first optocoupler B860 is connected to the first end of the second resistor R843 and the first power supply. The second end of the first side of the first optocoupler B860 is connected to the second end of the second resistor R843 and the second end of the first resistor R841. The first end of the first resistor R841 is connected to the control unit circuit 10. The first end of the second side of the first optocoupler B860 is connected to the fan drive unit circuit 40, the power control unit circuit 30, and the second power supply. The second end of the second side of the first optocoupler B860 is grounded. Based on this, the first resistor R841 can limit current and protect the circuit, while the second resistor R843 can act as a bias to ensure the first optocoupler B860 functions normally. The first communication branch, combining the structures of the first resistor R841, the second resistor R843, and the first optocoupler B860, can ensure the normal transmission of signals output from the control unit circuit 10 to the fan drive unit circuit 40 and the power control unit circuit 30, which is beneficial for the normal operation of the air conditioner.

[0075] In one scalable embodiment, the air conditioner also includes an optocoupler protection circuit connected to the first optocoupler B860 for protecting the first optocoupler B860.

[0076] The first optocoupler B860 achieves electrical isolation between input and output through optical signals, but its input or output terminals can still be damaged due to excessive current, reverse voltage surges, or other reasons. Therefore, setting up an optocoupler protection circuit connected to the first optocoupler B860 helps ensure its operation within safe parameter ranges, extending its lifespan and improving reliability. It can be understood that the optocoupler protection circuit can be connected to either the first or second side of the first optocoupler B860, depending on actual needs; no limitation is made here.

[0077] The structure of the optocoupler protection circuit is not unique. In one exemplary embodiment, such as... Figure 3 As shown, the optocoupler protection circuit includes a first diode V260, a second diode V261, a third resistor R844, and a fourth resistor R845.

[0078] In this circuit, the anode of the first diode V260 is connected to the first terminal of the second side of the first optocoupler B860, and the cathode of the first diode V260 is connected to the second power supply. The cathode of the second diode V261 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the second diode V261 is connected to the first terminal of the third resistor R844 and the first terminal of the fourth resistor R845. The second terminal of the third resistor R844 is connected to the first power supply, and the second terminal of the fourth resistor R845 is connected to the fan drive unit circuit 40.

[0079] During operation, the anode of the first diode V260 is connected to the first terminal of the second side of the first optocoupler B860, and the cathode of the first diode V260 is connected to the second power supply. The first diode V260 acts as a clamping device, ensuring that the voltage at the first terminal of the second side of the first optocoupler B860 never exceeds the voltage of the second power supply. The second power supply can serve as the drive power for the fan; its specific voltage is not limited, for example, it can be 18V. Generally, the voltage of the second power supply is higher than that of the first power supply.

[0080] The cathode of the second diode V261 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the second diode V261 is connected to the first terminals of the third resistor R844 and the fourth resistor R845. The second terminal of the third resistor R844 is connected to the first power supply, and the second terminal of the fourth resistor R845 is connected to the fan drive unit circuit 40. The third resistor R844 is a pull-up resistor, and the fourth resistor R845 is a current-limiting resistor, which limits the current and extends the service life of the devices.

[0081] In this embodiment, the optocoupler protection circuit includes a first diode V260, a second diode V261, a third resistor R844, and a fourth resistor R845. The anode of the first diode V260 is connected to the first terminal of the second side of the first optocoupler B860, and the cathode of the first diode V260 is connected to the second power supply. The cathode of the second diode V261 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the second diode V261 is connected to the first terminals of the third resistor R844 and the fourth resistor R845. The second terminal of the third resistor R844 is connected to the first power supply, and the second terminal of the fourth resistor R845 is connected to the fan drive unit circuit 40. Based on this, current limiting protection and clamping protection can be performed on the first optocoupler B860, reducing the impact of excessive current or voltage on the first optocoupler B860 and improving the working performance of the first optocoupler B860.

[0082] In one exemplary embodiment, such as Figure 3 As shown, the air conditioner also includes a third diode V242. The cathode of the third diode V242 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the third diode V242 is connected to the power control unit circuit 30.

[0083] The third diode V242 is positioned between the first optocoupler B860 and the power control unit circuit 30. Specifically, the cathode of the third diode V242 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the third diode V242 is connected to the power control unit circuit 30. Therefore, the third diode V242 ensures that when the fan drive unit circuit 40 communicates with the control terminal unit circuit 10 via the first optocoupler B860, it is unaffected by the power supply at the back end of the power control unit circuit 30.

[0084] In this embodiment, the air conditioner also includes a third diode V242. The cathode of the third diode V242 is connected to the first terminal of the second side of the first optocoupler B860, and the anode of the third diode V242 is connected to the power control unit circuit 30. The third diode V242 enables the normal communication of the fan to be unaffected by the backend power supply, which helps to improve the effectiveness of communication.

[0085] The structure of the power control unit circuit 30 is not limited. In one exemplary embodiment, such as Figure 3 As shown, the power control unit circuit 30 includes a first switching transistor V240, a fifth resistor R243, a sixth resistor R242, and a power chip N240.

[0086] Among them, the first end of the fifth resistor R243 is connected to the first end of the second side of the first optocoupler B860, the second end of the fifth resistor R243 is connected to the control end of the first switch V240 and the second end of the sixth resistor R242, the first end of the first switch V240 is connected to the first end of the sixth resistor R242 and the second power supply, the second end of the first switch V240 is connected to the input end of the fan and the power chip N240, and the output end of the power chip N240 is connected to the first power supply and the fan drive unit circuit 40.

[0087] The type of the first switching transistor V240 is not limited; for example, it can be a transistor or a MOSFET. Taking a transistor as an example, the control terminal of the first switching transistor V240 is the base of the transistor, the first terminal of the first switching transistor V240 is the emitter of the transistor, and the second terminal of the first switching transistor V240 is the collector of the transistor.

[0088] The control terminal of the first switch V240 is connected to the first terminal of the second side of the first optocoupler B860 through the fifth resistor R243. The first terminal of the first switch V240 is connected to the first terminal of the sixth resistor R242 and the second power supply. The second terminal of the first switch V240 is connected to the input terminal of the fan and the power chip N240. The connection to the fan can be used as the power supply terminal for supplying power to the fan. The first switch V240 may be in a conducting or turning-off state depending on the high or low level signal received at its control terminal. When the first switch V240 is conducting, the second power supply connected to its first terminal can be transmitted to the fan and the power chip N240, supplying power to the fan and the power chip N240, and thus powering the fan drive unit circuit 40, successfully waking up the power chip N240 and the fan drive unit circuit 40. When the first switching transistor V240 is turned off, the second power supply connected to the first terminal of the first switching transistor V240 cannot be transmitted to the fan and the power chip N240, and the fan and the power chip N240 lose power.

[0089] The two ends of the sixth resistor R242 are connected to the first terminal of the first switching transistor V240 and the control terminal of the first switching transistor V240, respectively. It can be used as a bias resistor to provide a stable bias voltage to the control terminal of the first switching transistor V240, so that the first switching transistor V240 operates in the amplification state and reduces the impact of temperature changes on circuit stability.

[0090] The first end of the fifth resistor R243 is connected to the first end of the second side of the first optocoupler B860, and the second end of the fifth resistor R243 is connected to the control terminal of the first switching transistor V240. The fifth resistor R243 can be used as a current limiting resistor to limit the current at the control terminal of the first switching transistor V240 and prevent the first switching transistor V240 from saturating due to excessive current.

[0091] The input terminal of the power chip N240 is connected to the fan and the second terminal of the first switching transistor V240, and the output terminal of the power chip N240 is connected to the first power supply and the fan drive unit circuit 40. The power chip N240 can process the incoming electrical energy before transmitting it to the fan drive unit circuit 40 connected to the output terminal of the power chip N240, thereby improving the quality of the power transmitted to the fan drive unit circuit 40.

[0092] In this embodiment, the power control unit circuit 30 includes a first switching transistor V240, a fifth resistor R243, a sixth resistor R242, and a power chip N240. The first end of the fifth resistor R243 is connected to the first end of the second side of the first optocoupler B860. The second end of the fifth resistor R243 is connected to the control terminal of the first switching transistor V240 and the second end of the sixth resistor R242. The first end of the first switching transistor V240 is connected to the first end of the sixth resistor R242 and the second power supply. The second end of the first switching transistor V240 is connected to the fan and the input terminal of the power chip N240. The output terminal of the power chip N240 is connected to the first power supply and the fan drive unit circuit 40. Based on the different conduction states of the first optocoupler B860, the conduction state of the first switching transistor V240 is also different, thereby enabling quick and convenient control of the power supply status of the fan, the power chip N240, and the fan drive unit circuit 40.

[0093] In a scalable implementation, such as Figure 3As shown, the power control unit circuit 30 also includes a fourth diode V241, a first capacitor C222, a second capacitor C223, and a third capacitor C224. The anode of the fourth diode V241 is connected to the second terminal of the first switching transistor V240, and the cathode of the fourth diode V241 is connected to the first terminal of the first switching transistor V240. The first terminal of the first capacitor C222 is connected to the input terminal of the power chip N240, and the second terminal of the first capacitor C222 is grounded. The first terminal of the second capacitor C223 is connected to the output terminal of the power chip N240, and the second terminal of the second capacitor C223 is grounded. The first terminal of the third capacitor C224 is connected to the output terminal of the power chip N240, and the second terminal of the third capacitor C224 is grounded.

[0094] In this circuit, the anode of the fourth diode V241 is connected to the second terminal of the first switching transistor V240, and the cathode of the fourth diode V241 is connected to the first terminal of the first switching transistor V240. When the first switching transistor V240 drives an inductive load such as a fan, the load will generate a back electromotive force (EMF) at the moment of power failure. If not limited, this back EMF may damage the first switching transistor V240. The fourth diode V241 can act as a freewheeling diode. The freewheeling diode quickly conducts, introducing the back EMF into the safety circuit and absorbing the reverse voltage or current in the circuit, preventing the first switching transistor V240 from being subjected to excessive voltage, thereby protecting the first switching transistor V240.

[0095] The first terminal of capacitor C222 is connected to the input terminal of power supply chip N240, and the second terminal of capacitor C222 is grounded. The first terminal of capacitor C223 is connected to the output terminal of power supply chip N240, and the second terminal of capacitor C223 is grounded. The first terminal of capacitor C224 is connected to the output terminal of power supply chip N240, and the second terminal of capacitor C224 is grounded. All three capacitors (C222, C223, and C224) can be used as filter capacitors to filter interference signals and improve the signal quality of power supply chip N240.

[0096] In this embodiment, the power control unit circuit 30 further includes a fourth diode V241, a first capacitor C222, a second capacitor C223, and a third capacitor C224. The anode of the fourth diode V241 is connected to the second terminal of the first switching transistor V240, and the cathode of the fourth diode V241 is connected to the first terminal of the first switching transistor V240. The first terminal of the first capacitor C222 is connected to the input terminal of the power chip N240, and the second terminal of the first capacitor C222 is grounded. The first terminal of the second capacitor C223 is connected to the output terminal of the power chip N240, and the second terminal of the second capacitor C223 is grounded. The first terminal of the third capacitor C224 is connected to the output terminal of the power chip N240, and the second terminal of the third capacitor C224 is grounded. Therefore, the fourth diode V241 can protect the first switching transistor V240, and the first capacitor C222, second capacitor C223, and third capacitor C224 can improve signal quality, thus comprehensively improving the operating performance of the air conditioner.

[0097] In one exemplary embodiment, the air conditioner further includes a power supply maintenance circuit connected to the fan drive unit circuit 40 and the power control unit circuit 30. The fan drive unit circuit 40, during operation, controls the power control unit circuit 30 to be in a power supply state by controlling the conduction state of the power supply maintenance circuit.

[0098] After the control unit circuit 10 sends a control signal to power up the fan drive unit circuit 40 and the fan, maintaining the power supply to the fan drive unit circuit 40 and the fan by continuously sending a power-on signal would increase the workload of the control unit circuit 10 and consume its port resources. Therefore, in this embodiment, a power supply maintenance circuit is provided to maintain the power supply state of the power control unit, thereby maintaining the power supply to the fan drive unit circuit 40 and the fan.

[0099] The power supply maintenance circuit connects the fan drive unit circuit 40 and the power control unit circuit 30. A switching unit can be included in the power supply maintenance circuit, connected to the fan drive unit circuit 40, and its on / off state can be controlled by the fan drive unit circuit 40. The operation of the fan drive unit indicates that it is powered. The fan drive unit circuit 40, during operation, controls the power control unit circuit 30 to be in a power supply state by controlling the conduction state of the power supply maintenance circuit.

[0100] In this embodiment, the air conditioner also includes a power supply maintenance circuit, which is connected to the fan drive unit circuit 40 and the power control unit circuit 30. During operation, the fan drive unit circuit 40 controls the power control unit circuit 30 to be in a power supply state by controlling the conduction state of the power supply maintenance circuit. Through the power supply maintenance circuit, the fan drive unit circuit 40 can control the power control unit circuit to be in a power supply state, ensuring that the fan drive unit circuit 40 can continuously and normally receive power, and also maintaining the power supply state of the fan.

[0101] The structure of the power supply maintenance circuit is not unique. In one exemplary embodiment, such as... Figure 3 As shown, the power supply maintenance circuit includes a second switch V243, a seventh resistor R244, and an eighth resistor R245. The control terminal of the second switch V243 is connected to the fan drive unit circuit 40 through the seventh resistor R244. The first terminal of the eighth resistor R245 is connected to the control terminal of the second switch V243, and the second terminal of the eighth resistor R245 is connected to the first terminal of the second switch V243 and grounded. The second terminal of the second switch V243 is connected to the power control unit circuit 30.

[0102] In this circuit, the control terminal of the second switching transistor V243 is connected to the fan drive unit circuit 40 via the seventh resistor R244. The seventh resistor R244 acts as a current-limiting resistor, limiting the current at the control terminal of the second switching transistor V243 and protecting it. The first terminal of the eighth resistor R245 is connected to the control terminal of the second switching transistor V243, and the second terminal of the eighth resistor R245 is connected to the first terminal of the second switching transistor V243. The eighth resistor R245 acts as a bias resistor, providing a stable bias voltage to the control terminal of the second switching transistor V243, ensuring that the second switching transistor V243 operates in amplification mode and reducing the impact of temperature changes on circuit stability.

[0103] The type of the second switching transistor V243 is not limited; for example, it can be a transistor or a MOSFET. Taking a transistor as an example, the control terminal of the second switching transistor V243 is the base of the transistor, the first terminal of the second switching transistor V243 is the emitter of the transistor, and the second terminal of the second switching transistor V243 is the collector of the transistor.

[0104] The control terminal of the second switch V243 is connected to the fan drive unit circuit 40 through the seventh resistor R244. The first terminal of the second switch V243 is grounded, and the second terminal is connected to the power control unit circuit 30. The second switch V243 may be in a conducting or turning-off state depending on the high or low level signal sent by the fan drive unit circuit 40. When the second switch V243 is conducting, the connection point between the second terminal of the second switch V243 and the power control unit circuit 30 is at a low level. When the second switch V243 is turning off, the connection point between the second terminal of the second switch V243 and the power control unit circuit 30 is at a high level. The connection point between the second terminal of the second switch V243 and the power control unit circuit 30 can be the first terminal of the fifth resistor R243. The fan drive unit circuit 40 can control the conduction state of the second switch V243 by sending signals, thereby controlling the on / off state of the power control unit circuit 30.

[0105] In this embodiment, the power supply maintenance circuit includes a second switch V243, a seventh resistor R244, and an eighth resistor R245. The control terminal of the second switch V243 is connected to the fan drive unit circuit 40 through the seventh resistor R244. The first terminal of the eighth resistor R245 is connected to the control terminal of the second switch V243, and the second terminal of the eighth resistor R245 is connected to the first terminal of the second switch V243 and grounded. The second terminal of the second switch V243 is connected to the power control unit circuit 30. Therefore, the fan drive unit circuit 40 can control the power supply maintenance circuit to maintain a stable power supply state by adjusting the signal sent to the control terminal of the second switch V243, thereby improving the operational stability of the air conditioner.

[0106] The structure of the second communication branch is not unique. In one exemplary embodiment, such as... Figure 3 As shown, the second communication branch also includes the ninth resistor R842, the tenth resistor R847, the eleventh resistor R848, and the twelfth resistor R849.

[0107] The first end of the second side of the second optocoupler B861 ( Figure 3 The C pin of the second optocoupler B861 is connected to the second terminal of the ninth resistor R842 and the second terminal of the tenth resistor R847. The first terminal of the ninth resistor R842 is connected to the first power supply, and the first terminal of the tenth resistor R847 is connected to the control terminal unit circuit 10. The second terminal of the second side of the second optocoupler B861 ( Figure 3 The E pin of the second optocoupler B861 is grounded;

[0108] The first end of the first side of the second optocoupler B861 ( Figure 3Pin A of the second optocoupler B861 is connected to the first power supply via the eleventh resistor R848, and to the first end of the twelfth resistor R849. The second end of the first side of the second optocoupler B861 ( Figure 3 The K pin of the second optocoupler B861 is connected to the second end of the twelfth resistor R849 and then to the fan drive unit circuit 40.

[0109] If the fan drive unit circuit 40 emits a high-level signal, the first side of the second optocoupler B861 is not conducting, and the second side of the second optocoupler B861 is not conducting. The control terminal unit circuit 10 reads the high-level signal output by the fan drive unit circuit 40. If the fan drive unit circuit 40 emits a low-level signal, the first side of the second optocoupler B861 is conducting, and the second side of the second optocoupler B861 is conducting. The control terminal unit circuit 10 reads the low-level signal output by the fan drive unit circuit 40.

[0110] In this embodiment, the second communication branch further includes a ninth resistor R842, a tenth resistor R847, an eleventh resistor R848, and a twelfth resistor R849. The first terminal of the second side of the second optocoupler B861 is connected to the second terminals of the ninth resistor R842 and the tenth resistor R847. The first terminal of the ninth resistor R842 is connected to the first power supply, and the first terminal of the tenth resistor R847 is connected to the control unit circuit 10. The second terminal of the second side of the second optocoupler B861 is grounded. The first terminal of the first side of the second optocoupler B861 is connected to the first power supply through the eleventh resistor R848 and to the first terminal of the twelfth resistor R849. The second terminal of the first side of the second optocoupler B861 is connected to the second terminal of the twelfth resistor R849 and to the fan drive unit circuit 40. Based on the above structure, the control unit circuit 10 can communicate with the fan drive unit circuit 40 and receive signals output by the fan drive unit circuit 40.

[0111] To better understand the above embodiments, a detailed explanation is provided below with reference to a specific embodiment. In one embodiment, the air conditioner includes a control unit circuit 10, a fan communication unit circuit 20, a fan drive unit circuit 40, a power control unit circuit 30, a fan, an optocoupler protection circuit, a power supply maintenance circuit, and a third diode V242.

[0112] Among them, such as Figure 3As shown, the wind turbine communication unit circuit 20 includes a first communication branch and a second communication branch. The first communication branch includes a first optocoupler B860, a first resistor R841, and a second resistor R843. The second communication branch includes a second optocoupler B861, a ninth resistor R842, a tenth resistor R847, an eleventh resistor R848, and a twelfth resistor R849. The optocoupler protection circuit includes a first diode V260, a second diode V261, a third resistor R844, and a fourth resistor R845. The power control unit circuit 30 includes a first switching transistor V240, a fifth resistor R243, a sixth resistor R242, a power chip N240, a fourth diode V241, a first capacitor C222, a second capacitor C223, and a third capacitor C224. The power supply maintenance circuit includes a second switching transistor V243, a seventh resistor R244, and an eighth resistor R245. The control terminal unit circuit 10 includes a control terminal chip, and the wind turbine drive unit circuit 40 includes a wind turbine drive chip N302.

[0113] The control signal FAN-TXD1 sent by the control unit circuit 10 is connected to one end of the current-limiting first resistor R841 via a communication line. The other end of the current-limiting first resistor R841 is connected to one end of the biasing second resistor R843, and the other end of the second resistor R843 is connected to a 5V power supply. The two ends of the second resistor R843 are connected between the AK pins of the first optocoupler B860. The C pin of the first optocoupler B860 is connected to the cathode of the third diode V242. The anode of the third diode V242 is connected to one end of the current-limiting fifth resistor R243. The other end of the fifth resistor R243 is connected to the base of transistor V240, and simultaneously, the other end of the fifth resistor R243 is connected to one end of the sixth resistor R242, and the other end of R242 is connected to an 18V power supply. The emitter of transistor V240 is connected to the 18V power supply, and simultaneously, the emitter of transistor V240 is connected to the cathode of the fourth diode V241. The collector of transistor V240 and the anode of the fourth diode V241 are connected to the fan power supply FAN-18V. The FAN-18V power supply for the fan is connected to one end of the first capacitor C222 and the Vin input pin of the power chip N240. The other end of the first capacitor C222 is connected to the GND ground pin of the power chip N240. The Vout pin of the power chip is connected to the positive terminal of the second capacitor C223, i.e., the output power supply of 5V. The negative terminal of the second capacitor C223 is connected to the GND ground pin of the power chip N240. The third capacitor C224 is connected in parallel across the two ends of the second capacitor C223. The output 5V power supply is connected to the VDD pin of the fan driver chip to power the fan driver chip.

[0114] The anode of the third diode V242 is connected to the collector of the NPN transistor V243, and the emitter of the transistor V243 is connected to GND (ground). The base of the transistor V243 is connected to one end of the eighth resistor R245, and the other end of the eighth resistor R245 is connected to the emitter of the transistor V243 and grounded to GND. Simultaneously, the base of the transistor V243 is connected to one end of the seventh resistor R244, and the other end of the seventh resistor R244 is connected to the control pin CONRTOL-PB11 of the fan drive chip.

[0115] The collector (C) pin of the first optocoupler B860 is connected to the anode of the first diode V260. The cathode of the first diode V260 is connected to the 18V power supply. The first diode V260 acts as a clamp, ensuring that the voltage at the C pin never exceeds 18V. The C pin of the first optocoupler B860 is connected to the cathode of the second diode V261. The anode of the second diode V261 is connected to one end of the pull-up resistor R844, and the other end of the third resistor R844 is connected to the 5V power supply. Simultaneously, the anode of the second diode V261 is connected to one end of the current-limiting fourth resistor R845, and the other end of R845 is connected to the data read pin RXD-FAN of the fan driver chip. The first diode V260 and the second diode V261 protect the optocoupler.

[0116] The transmit pin TXD-FAN of the fan drive chip is connected to one end of the twelfth resistor R849. The other end of the twelfth resistor R849 is connected to one end of the eleventh resistor R848, and the other end of the eleventh resistor R848 is connected to a 5V power supply. The two ends of the twelfth resistor R849 are connected between the AK pins of the second optocoupler B861. The C pin of the second optocoupler B861 is connected to one end of the tenth resistor R847 and also to one end of the ninth resistor R842. The other end of the ninth resistor R842 is connected to a 5V power supply. The other end of the tenth resistor R847 is connected to the control terminal unit circuit 10 via a communication line.

[0117] like Figure 4 and Figure 5 As shown, after the control unit circuit 10 sends the power-on command, it ensures reliable communication establishment. The signal reaches the AK terminal of the first optocoupler B860 through the first resistor R841. The AK terminal of the first optocoupler B860 is turned on, and the CE terminal of the first optocoupler B860 is also turned on. Transistor V240 is turned on, and the 18V power supply powers the power chip N240 and the fan driver chip N302, successfully waking up the power chip N240 and the fan driver chip N302. After the fan driver chip N302 is woken up, it continuously sets the pin PB11 to a high level; transistor V243 is continuously turned on, and the level at point H is continuously low, ensuring normal power supply to the chip. The third diode V242 ensures that the normal communication of the fan is not affected by the downstream power supply.

[0118] The control chip sends control signals to the fan drive chip, and the control chip and the fan drive chip communicate normally to control the operation of the fan. When the control chip sends a shutdown signal, after receiving the shutdown command, the fan drive chip N302's pin PB11 is set to a low level, transistor V243 is cut off, the potential at point H is high, transistor V240 is cut off, and the chip's power supply is disconnected, thus achieving chip power-off after shutdown. At the same time, FAN-TXD1 sends a high level to reduce standby power consumption.

[0119] The air conditioner provided in this embodiment saves one optocoupler while achieving low power consumption control, reducing circuit costs and saving space for printed circuit board layout, making the layout of the printed circuit board more convenient.

[0120] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0121] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An air conditioner, characterized in that, include: The control unit circuit outputs control signals based on received user commands or sensor signals. The wind turbine communication unit circuit connects the control terminal unit circuit and the wind turbine drive unit circuit, and is used to transmit the control signal to the wind turbine drive unit circuit. The fan drive unit circuit is connected to the fan and controls the operation of the fan based on the control signal. The power control unit circuit is connected to the fan drive unit circuit and the fan, and supplies power to the fan drive unit circuit and the fan; The fan, when in operation, drives airflow and performs heat exchange; The wind turbine communication unit circuit includes a first communication branch and a second communication branch. Both the first communication branch and the second communication branch are connected between the control terminal unit circuit and the wind turbine drive unit circuit. The power control unit circuit is also connected to the first communication branch. The first communication branch includes a first optocoupler, and the second communication branch includes a second optocoupler. Both the first optocoupler and the second optocoupler are connected between the control terminal unit circuit and the fan drive unit circuit. The side of the first optocoupler connected to the fan drive unit circuit is connected to the power control unit circuit.

2. The air conditioner according to claim 1, characterized in that, The first communication branch also includes a first resistor and a second resistor; The first end of the first side of the first optocoupler is connected to the first end of the second resistor and the first power supply, the second end of the first side of the first optocoupler is connected to the second end of the second resistor and the second end of the first resistor, and the first end of the first resistor is connected to the control terminal unit circuit. The first end of the second side of the first optocoupler is connected to the wind turbine drive unit circuit, the power control unit circuit, and the second power supply, and the second end of the second side of the first optocoupler is grounded.

3. The air conditioner according to claim 1, characterized in that, It also includes an optocoupler protection circuit, which is connected to the first optocoupler and is used to protect the first optocoupler.

4. The air conditioner according to claim 3, characterized in that, The optocoupler protection circuit includes a first diode, a second diode, a third resistor, and a fourth resistor; The anode of the first diode is connected to the first terminal of the second side of the first optocoupler, and the cathode of the first diode is connected to the second power supply. The cathode of the second diode is connected to the first end of the second side of the first optocoupler, the anode of the second diode is connected to the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected to the first power supply, and the second end of the fourth resistor is connected to the fan drive unit circuit.

5. The air conditioner according to claim 1, characterized in that, It also includes a third diode, the cathode of which is connected to the first end of the second side of the first optocoupler, and the anode of which is connected to the power control unit circuit.

6. The air conditioner according to claim 1, characterized in that, The power control unit circuit includes a first switching transistor, a fifth resistor, a sixth resistor, and a power chip; The first end of the fifth resistor is connected to the first end of the second side of the first optocoupler, the second end of the fifth resistor is connected to the control end of the first switching transistor and the second end of the sixth resistor, the first end of the first switching transistor is connected to the first end of the sixth resistor and the second power supply, the second end of the first switching transistor is connected to the input end of the fan and the power chip, and the output end of the power chip is connected to the first power supply and the fan drive unit circuit.

7. The air conditioner according to claim 6, characterized in that, The power control unit circuit also includes a fourth diode, a first capacitor, a second capacitor, and a third capacitor; The anode of the fourth diode is connected to the second terminal of the first switching transistor, the cathode of the fourth diode is connected to the first terminal of the first switching transistor, the first terminal of the first capacitor is connected to the input terminal of the power chip, the second terminal of the first capacitor is grounded, the first terminal of the second capacitor is connected to the output terminal of the power chip, the second terminal of the second capacitor is grounded, the first terminal of the third capacitor is connected to the output terminal of the power chip, and the second terminal of the third capacitor is grounded.

8. The air conditioner according to claim 1, characterized in that, It also includes a power supply maintenance circuit, which is connected to the fan drive unit circuit and the power control unit circuit; The fan drive unit circuit is used to control the power control unit circuit to be in a power supply state by controlling the conduction state of the power supply maintenance circuit during operation.

9. The air conditioner according to claim 8, characterized in that, The power supply sustaining circuit includes a second switching transistor, a seventh resistor, and an eighth resistor; The control terminal of the second switching transistor is connected to the fan drive unit circuit through the seventh resistor. The first terminal of the eighth resistor is connected to the control terminal of the second switching transistor, the second terminal of the eighth resistor is connected to the first terminal of the second switching transistor and grounded, and the second terminal of the second switching transistor is connected to the power control unit circuit.

10. The air conditioner according to claim 1, characterized in that, The second communication branch also includes a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The first end of the first side of the second optocoupler is connected to the first power supply through the eleventh resistor and to the first end of the twelfth resistor. The second end of the first side of the second optocoupler is connected to the second end of the twelfth resistor and to the fan drive unit circuit. The first end of the second side of the second optocoupler is connected to the second end of the ninth resistor and the second end of the tenth resistor. The first end of the ninth resistor is connected to the first power supply, and the first end of the tenth resistor is connected to the control terminal unit circuit. The second end of the second side of the second optocoupler is grounded.

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