Air conditioner

Abstract

The utility model provides a kind of air conditioner, comprising: switching power supply circuit module, single pulse PFC control module, motor control module, voltage doubler circuit module, single pulse PFC control power module and controller, wherein, controller is connected with single pulse PFC control module and single pulse PFC control power module, for issuing high level instruction or low level instruction to single pulse PFC control module and single pulse PFC control power module, to control single pulse PFC control power module charges, or control single pulse PFC control power module is powered for single pulse PFC control module, so as not to need to increase transformer winding for single pulse PFC control module separately and power supply, reduce the number of winding, reduce transformer design difficulty and volume, reduce design cost.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0002] In air conditioning systems targeting markets with input AC voltages of 100–120V, in order to meet the DC bus voltage requirements of high-power loads such as compressors and DC motors, voltage doubler rectifier circuits are typically used to rectify the lower input AC voltage to a higher DC bus voltage. However, voltage doubler rectification is a non-linear rectification method, which can result in the input current waveform being out of sync with the input voltage waveform, leading to a low power factor and the generation of large harmonic currents.

[0003] In existing technologies, single-pulse power factor correction (PFC) technology is typically used to address the aforementioned issues. However, because the reference ground of the single-pulse PFC control signal is independent from the reference ground of the DC voltage after voltage multiplier rectification, the single-pulse PFC control signal is implemented using optocoupler isolation. Furthermore, the 15V power supply required for single-pulse PFC control is rectified using a transformer with an independent winding. This approach results in an additional independent winding on the transformer to power the single-pulse PFC control, increasing the design complexity and cost of the switching power supply transformer. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this utility model is to provide an air conditioner that, by connecting the controller to a single-pulse PFC control module and a single-pulse PFC control power supply module, can selectively send high-level signals and low-level signals to the single-pulse PFC control module and the single-pulse PFC control power supply module respectively, utilize its own existing power supply module to charge the single-pulse PFC control power supply module, and can control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module. This eliminates the need to add a separate transformer winding for the single-pulse PFC control module, reduces the number of windings, lowers the design difficulty and size of the transformer, and reduces design costs.

[0006] To achieve the above objectives, a first aspect of this utility model provides an air conditioner, comprising: A switching power supply circuit module, wherein the switching power supply circuit module is used to convert high voltage DC voltage into low voltage DC voltage; A single-pulse PFC control module, wherein the input terminal of the single-pulse PFC control module is connected to the output terminal of the switching power supply circuit module and the output terminal of the single-pulse PFC control power supply module respectively, and the single-pulse PFC control module is used to adjust the input current waveform to adjust the power factor of the air conditioner when the switching power supply circuit module or the single-pulse PFC control power supply module is powered. A motor control module, the input terminal of which is connected to the output terminal of the switching power supply circuit module, is used to invert the low-voltage DC voltage into AC voltage to control the operation of the compressor and the fan; A voltage multiplier circuit module, the input terminal of which is connected to the output terminal of the motor control module, is used to convert the AC voltage into DC voltage and increase the DC voltage value; The input terminal of the single-pulse PFC control power supply module is connected to the output terminal of the controller and the output terminal of the switching power supply circuit module, respectively. The single-pulse PFC control power supply module is used to charge the single-pulse PFC control module when it receives a high-level command from the controller, and to supply power to the single-pulse PFC control module when it receives a low-level command from the controller. The controller is connected to the single-pulse PFC control module and the single-pulse PFC control power supply module, and is used to send high-level or low-level commands to the single-pulse PFC control module and the single-pulse PFC control power supply module to control the single-pulse PFC control power supply module to charge, or to control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module.

[0007] According to the embodiment of the present invention, the air conditioner connects the controller to the single-pulse PFC control module and the single-pulse PFC control power supply module. It can selectively send high-level signals and low-level signals to the single-pulse PFC control module and the single-pulse PFC control power supply module respectively. It can use its own existing power supply module to charge the single-pulse PFC control power supply module and control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module. Therefore, it is not necessary to add a separate transformer winding for the single-pulse PFC control module to supply power, which reduces the number of windings, reduces the design difficulty and volume of the transformer, and reduces the design cost.

[0008] In some embodiments, the single-pulse PFC control power supply module includes a first switching transistor and an electrolytic capacitor, wherein the source of the first switching transistor is connected to a reference ground, the drain of the first switching transistor is connected to one end of the electrolytic capacitor, and the gate of the first switching transistor is connected to the controller.

[0009] The above technical solution has the following beneficial effects: the first switching transistor and the electrolytic capacitor in the single-pulse PFC control power supply module are connected by the source to the reference ground, the drain to the positive terminal of the capacitor, and the gate to the controller, which constitutes a high-efficiency bootstrap power supply circuit. It can be used as an independent power supply, which solves the complexity problem of traditional independent winding transformers.

[0010] In some embodiments, the single-pulse PFC control module includes: an isolation component, a first terminal of which is connected to the controller, and a second terminal of which is connected to the PFC control power supply module, for receiving a level signal sent by the controller to control the circuit connection and disconnection between the single-pulse PFC control power supply module and the single-pulse PFC control module.

[0011] The above technical solution has the following beneficial effects: by setting up an isolation component, the circuit between the single-pulse PFC control power module and the single-pulse PFC control module can be switched on and off by the controller's instructions, ensuring the stable operation of the single-pulse PFC control power module during charging and discharging.

[0012] In some embodiments, during the charging process of the single-pulse PFC control power module, the controller is configured to: send the high-level command to the gate of the first switching transistor and send the low-level signal to the first terminal of the isolation component to control the single-pulse PFC control power module to charge.

[0013] The above technical solution has the following beneficial effects: Through the precise instructions of the controller, the single-pulse PFC control power module can complete the charging process of the electrolytic capacitor during non-PFC working periods, ensuring a stable power output during PFC working periods.

[0014] In some embodiments, during the charging process of the single-pulse PFC control power module, the single-pulse PFC control power module is configured to: receive the high-level command and control the first switch to turn on in order to charge the electrolytic capacitor; The single-pulse PFC control module is configured as follows: Upon receiving the low-level signal, the isolation component is controlled to disconnect, thereby shutting off the circuit between the single-pulse PFC control power supply module and the single-pulse PFC control module.

[0015] The above technical solution has the following beneficial effects: by receiving a high-level command to control the first switching transistor to turn on, a charging path from the 15V power supply to the electrolytic capacitor is established, allowing the electrolytic capacitor to store sufficient energy; at the same time, by receiving a low-level signal to control the isolation component to turn off, the circuit connection with the single-pulse PFC control module is cut off, avoiding the accidental activation of the power factor correction function.

[0016] In some embodiments, during the process of controlling the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module, the controller is configured to: send the high-level command to the first terminal of the isolation component and send the low-level signal to the gate of the first switching transistor, so as to control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module.

[0017] The above technical solution has the following beneficial effects: through the precise instructions of the controller, it can be ensured that the single-pulse PFC control power supply module provides a stable power output to the single-pulse PFC control module during the PFC working period.

[0018] In some embodiments, during the process of controlling the single-pulse PFC control power module to supply power to the single-pulse PFC control module, the single-pulse PFC control power module is configured to: receive the low-level instruction and control the first switching transistor to turn off, so as to stop charging the electrolytic capacitor; The single-pulse PFC control module is configured as follows: Upon receiving the high-level signal, the isolation component is controlled to conduct, thereby connecting the circuit between the single-pulse PFC control power supply module and the single-pulse PFC control module.

[0019] The above technical solution has the following beneficial effects: by receiving a ground level command to control the first switching transistor to turn off and receiving a low level signal to control the isolation component to turn on, the single-pulse PFC control power supply module can supply power to the single-pulse PFC control module, so that the single-pulse PFC control module can adjust the power factor of the air conditioner.

[0020] In some embodiments, the isolation component is an optical coupler.

[0021] The above technical solution has the following beneficial effects: by using an optocoupler as an isolation component, it can quickly respond to the level signal of the controller and accurately control the circuit connection and disconnection between the single-pulse PFC control power supply module and the single-pulse PFC control module, thereby increasing the reliability and circuit stability of the air conditioner.

[0022] In some embodiments, the single-pulse PFC control power supply module further includes a diode and a first resistor, wherein the anode of the diode is connected to the switching power supply circuit module through the first resistor, and the cathode of the diode is connected to the electrolytic capacitor.

[0023] The above technical solution has the following beneficial effects: the unidirectional conductivity of the diode avoids reverse impact on the switching power supply module when the electrolytic capacitor discharges, while the first resistor limits the surge current in the early stage of charging, preventing the electrolytic capacitor from breaking down or overheating due to instantaneous large current.

[0024] In some embodiments, the single-pulse PFC control module further includes a second switching transistor and a second resistor, one end of the second resistor being connected to the isolation component and the other end of the second resistor being connected to the second switching transistor.

[0025] The above technical solution has the following beneficial effects: the second resistor limits the impact of the output current of the isolation component on the second switching transistor, avoiding the second switching transistor from being broken down or thermally damaged due to overcurrent.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the controller according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a single-pulse PFC control power supply module according to an embodiment of the present invention; Figure 6 This is a flowchart illustrating a single-pulse PFC control module according to an embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this utility model, all the modules mentioned can be set in, for example... Figure 1 The air conditioner 1 shown in this invention performs a refrigeration cycle by using a compressor, condenser, evaporator, throttling device, and four-way valve. The refrigeration cycle includes a series of processes involving compression, condensation, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0033] The compressor compresses the refrigerant gas, which is in a high-temperature, high-pressure state and enters through the return pipe, and then discharges the compressed refrigerant gas through the exhaust pipe. The discharged refrigerant gas flows into the condenser through the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0034] The evaporator evaporates the refrigerant that expands in the throttling device and returns the refrigerant gas, now at a low temperature and low pressure, to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, air conditioner 1 regulates the temperature of the indoor space.

[0035] Combination Figure 2As shown, the air conditioner 1 in this application includes an indoor unit 13 and an outdoor unit 12, which can be configured as split-type units. The indoor unit 13 can be configured as a wall-mounted unit, a ceiling-mounted unit, a ducted unit, etc., and the indoor unit 13 is installed on the top or ceiling of the indoor room.

[0036] Taking indoor wall-mounted units as an example, indoor wall-mounted units are usually installed on indoor walls or other locations. For example, indoor cabinet units (not shown in the figure) are also a type of indoor unit 13.

[0037] Taking a split-type air conditioner as an example, the air conditioner 1 includes an indoor unit 13 and an outdoor unit 12. The outdoor unit 12 is usually installed outdoors and is used for heat exchange in the indoor environment.

[0038] Furthermore, the air conditioner 1 includes a controller 71 to control the operation of various components within the air conditioner 1, enabling each component to perform its predetermined functions. The air conditioner 1 also includes a control device 200, which, exemplarily, is a remote control. This remote control has the capability to communicate with the controller 71, for example, using infrared or other communication methods. The remote control allows the user to perform various controls on the air conditioner 1, enabling interaction between the user and the air conditioner 1.

[0039] In this embodiment of the application, the indoor unit 13 of the air conditioner 1 is located at the top or upper part of the room. Generally, the installation height of the indoor unit 13 is higher than the user's activity area. The indoor unit 13 includes a return air vent 17 and an air outlet 16 that communicate with the room. Indoor air flows back into the room through the return air vent 17 and the indoor unit 13, and then through the air outlet 16.

[0040] An air guide plate 2 is installed at the air outlet 16. By changing its relative rotation angle with the air outlet 16, the air guide plate 2 adjusts the outflow direction of the air flowing through the air outlet 12, thereby affecting the stratification of indoor air temperature.

[0041] This application embodiment also provides a hardware structure diagram of the controller 71, such as... Figure 3 As shown, the controller 71 includes a processor 83, and optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, memory 82, and communication interface 84 are connected via a bus 81.

[0042] Processor 83 can be a central processing unit (CPU), a general-purpose processor (NP), a network processor (NP), a digital signal processor (DSP), a microprocessor (Microcontroller), a programmable logic device (PLD), or any combination thereof. Processor 83 can also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 83 can also include multiple CPUs, and processor 83 can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, processor 83 can refer to one or more devices, circuits, or processing cores used for processing data (e.g., computer program instructions).

[0043] The memory 82 can be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the air conditioner 1 provided in this application embodiment.

[0044] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, circuit, transceiver, or any device capable of communication.

[0045] Bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. Bus 81 can be divided into address bus 81, data bus 81, control bus 81, etc.

[0046] The following is combined Figures 4-6 An air conditioner 1 according to an embodiment of the present utility model is described.

[0047] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 includes a switching power supply circuit module 100, which is used to convert high voltage DC voltage into low voltage DC power.

[0048] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 may include: a motor control module 110, the input terminal of which is connected to the output terminal 100 of the switching power supply circuit module, for converting low-voltage DC voltage into AC voltage to control the operation of the compressor and the fan.

[0049] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 may include a single-pulse PFC control module 130. The input terminal of the single-pulse PFC control module 130 is connected to the output terminal of the switching power supply circuit module 100 and the output terminal of the single-pulse PFC control power supply module 140, respectively. It is used to adjust the input current waveform to adjust the power factor of the air conditioner 1 when the switching power supply circuit module 100 or the single-pulse PFC control power supply module 140 is powered.

[0050] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 may include a voltage multiplier circuit module 120, the input terminal of which is connected to the output terminal of the motor control module 110, for converting AC voltage into DC voltage and increasing the DC voltage value.

[0051] In some embodiments, such as Figure 4 As shown, the air conditioner 1 may include a single-pulse PFC control power supply module 140. The input terminal of the single-pulse PFC control power supply module 140 is connected to the output terminal of the controller 71 and the output terminal of the switching power supply circuit module 100, respectively. It is used to charge the single-pulse PFC control module 130 when a high-level command is received from the controller, and to discharge the single-pulse PFC control module 130 when a low-level command is received from the controller.

[0052] In some embodiments, such as Figure 4As shown, the air conditioner 1 may include: a controller 71, the output terminal of which is connected to the input terminal of the single-pulse PFC control module 130 and the input terminal of the single-pulse PFC control power module 140, for sending high-level or low-level commands to the single-pulse PFC control module 130 and the single-pulse PFC control power module 140 to control the single-pulse PFC control power module 140 to charge, or to control the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130.

[0053] Specifically, in air conditioner 1, controller 71 is connected to single-pulse PFC control module 130 and single-pulse PFC control power supply module 140. It can precisely control the coordinated operation of single-pulse PFC control module 130 and single-pulse PFC control power supply module 140 through specific level commands (high level / low level). Single-pulse PFC control module 130 is responsible for adjusting the input current waveform under power supply conditions to improve the power factor of air conditioner 1, thus solving the current-voltage asynchrony problem caused by voltage doubler rectification. Single-pulse PFC control power supply module 140, when in charging mode, charges its internal energy storage components (such as electrolytic capacitors) to store sufficient energy (15V voltage). After charging, the stored energy (15V voltage) is supplied to single-pulse PFC control module 130 to drive it and adjust the input current waveform. This eliminates the need to add a separate transformer winding for powering single-pulse PFC control module 130, reducing the number of windings and lowering the design difficulty, size, and cost of the transformer.

[0054] According to the embodiment of the present invention, the air conditioner 1 connects the controller 71 to the single-pulse PFC control module 130 and the single-pulse PFC control power module 140. It can selectively send high-level signals and low-level signals to the single-pulse PFC control module 130 and the single-pulse PFC control power module 140 respectively. It can use its own existing power module to charge the single-pulse PFC control power module 140 and control the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130. Therefore, it is not necessary to add a separate transformer winding for the single-pulse PFC control module 130 to supply power, which reduces the number of windings, reduces the design difficulty and volume of the transformer, and reduces the design cost.

[0055] In one embodiment of this utility model, combined with Figure 5 As shown, the single-pulse PFC control power supply module 140 includes a first switching transistor V1 and an electrolytic capacitor C1. The source of the first switching transistor V1 is connected to a reference ground, the drain of the first switching transistor V1 is connected to one end of the electrolytic capacitor C1, and the gate of the first switching transistor V1 is connected to the controller 71.

[0056] Specifically, the single-pulse PFC control power supply module 140 is equipped with a first switching transistor (MOSFET) and an electrolytic capacitor. The source of the first switching transistor is connected to a reference ground (usually the reference ground of a 15V power supply), the drain of the first switching transistor is connected to one end of the electrolytic capacitor, and the gate of the first switching transistor is connected to the controller 71, forming a complete charging and discharging circuit structure. The purpose of this structure is to switch the potential of the electrolytic capacitor under the command of the controller 71, thereby enabling it to switch between the roles of a charging component and an isolation power supply. In one embodiment of this utility model, combined with Figure 6 As shown, the single-pulse PFC control module 130 includes: an isolation component B1, the first end of which is connected to the controller 71, and the second end of which is connected to the PFC control power supply module, for receiving the level signal sent by the controller 71 to control the circuit connection and disconnection between the single-pulse PFC control power supply module 140 and the single-pulse PFC control module 130.

[0057] Specifically, the single-pulse PFC control module 130 is equipped with an isolation component. The first end of the isolation component is connected to the controller 71 and can receive the level signal (high level or low level) sent by the controller 71. This level signal is essentially a control command issued by the controller 71 (such as "power on" or "power off"). The second end of the isolation component is connected to the PFC control power module and is used to control the circuit connection and disconnection between the single-pulse PFC control power module 140 and the single-pulse PFC control module 130 when receiving the level signal sent by the controller 71.

[0058] In one embodiment of the present invention, during the charging process of the single-pulse PFC control power module 140, the controller 71 is configured to: send a high-level command to the gate of the first switching transistor and send a low-level signal to the first end of the isolation component, so as to control the single-pulse PFC control power module 140 to charge.

[0059] Specifically, during the operation of air conditioner 1, the core task of the single-pulse PFC control power supply module 140 is to provide a stable 15V control power supply to the single-pulse PFC control module 130. During non-PFC operating periods (such as air conditioner standby, light load operation, or when the PFC function is not activated), the energy storage components (such as electrolytic capacitors) in the single-pulse PFC control power supply module 140 need to be charged first to store sufficient energy (15V voltage) so that it can quickly supply power to the single-pulse PFC control module 130 when PFC correction is required later. Therefore, the charging process... The process is the preparatory stage for the PFC function. Its goal is to fully charge the electrolytic capacitor, laying the foundation for powering the subsequent PFC control signal. In specific operation, the controller 71 can send a high-level command to the gate of the first switching transistor and a low-level signal to the first end of the isolation component to control the single-pulse PFC control power supply module 140 to charge. Specifically, this means controlling the circuit between the single-pulse PFC control power supply module 140 and the single-pulse PFC control module 130 to disconnect and controlling the power supply to charge the electrolytic capacitor of the single-pulse PFC control power supply module 140.

[0060] In one embodiment of the present invention, during the charging process of the single-pulse PFC control power module 140, the single-pulse PFC control power module 140 is configured to: receive a high-level command and control the first switching transistor to turn on in order to charge the electrolytic capacitor. The single-pulse PFC control module 130 is configured as follows: Upon receiving a low-level signal, the isolation component is disconnected to shut down the circuit between the single-pulse PFC control power supply module 140 and the single-pulse PFC control module 130.

[0061] Specifically, during the charging process of the single-pulse PFC control power module 140, the gate of the first switching transistor of the single-pulse PFC control power module 140 can receive a high-level signal sent by the controller 71. At this time, the first switching transistor will be turned on. After the power supply of the switching power supply circuit (such as the DC power supply after rectification of the mains power) charges the electrolytic capacitor, it can return to the reference ground corresponding to the power supply of the switching power supply circuit through the first switching transistor, thereby completing the charging process of the electrolytic capacitor.

[0062] Furthermore, the isolation component of the single-pulse PFC control module 130 can receive a low-level signal from the controller 71 to control the isolation component to disconnect through the internal drive circuit, thereby shutting off the circuit between the single-pulse PFC control power module 140 and the single-pulse PFC control module 130, so as to ensure the normal operation of the charging process of the single-pulse PFC control power module 140.

[0063] In one embodiment of the present invention, during the process of controlling the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130, the controller 71 is configured to: send a high-level command to the first end of the isolation component and send a low-level signal to the gate of the first switching transistor, so as to control the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130.

[0064] Specifically, during the process of controlling the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130, the controller 71 sends a high-level command to the first terminal of the isolation component and a low-level signal to the gate of the first switching transistor to control the conduction between the single-pulse PFC control power module 140 and the single-pulse PFC control module 130, ensuring that the single-pulse PFC control power module 140 provides a stable 15V power supply to the single-pulse PFC control module 130.

[0065] In one embodiment of the present invention, during the process of controlling the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130, the single-pulse PFC control power module 140 is configured to: receive a low-level command and control the first switching transistor to turn off in order to stop charging the electrolytic capacitor. The single-pulse PFC control module 130 is configured as follows: Upon receiving a high-level signal, the isolation component is turned on to connect the circuit between the single-pulse PFC control power supply module 140 and the single-pulse PFC control module 130.

[0066] Specifically, during the process of controlling the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130, the controller 71 can simultaneously send a high level to the first terminal of the isolation component and a low level to the gate of the first switching transistor. At this time, the low-level signal received by the gate of the first switching transistor causes the first switching transistor to be turned off from the switching power supply circuit, making the single-pulse PFC control power module 140 an independent isolated power supply. At this time, the voltage on the electrolytic capacitor is supplied to the power device (e.g., IGBT) of the single-pulse PFC control module 130 through the isolation component, and then returns to its corresponding reference ground, thereby achieving the purpose of adjusting the input current.

[0067] Furthermore, the high-level command received by the isolation component will cause it to disconnect through its internal drive circuit, thereby connecting the circuit between the single-pulse PFC control power module 140 and the single-pulse PFC control module 130, ensuring that the single-pulse PFC control power module 140 provides a stable 15V power supply to the single-pulse PFC control module 130.

[0068] In one embodiment of this utility model, the isolation component is an optical coupler.

[0069] Specifically, the isolation component can be an optocoupler, whose input and output sides are physically isolated by a transparent insulating material, forming a complete electrical isolation barrier. In the single-pulse PFC control module 130 of the air conditioner 1, the optocoupler, as an isolation component, can selectively conduct or cut off the circuit connection between the single-pulse PFC control power module 140 and the single-pulse PFC control module 130 when a high / low level signal is received.

[0070] In one embodiment of this utility model, combined with Figure 5 As shown, the single-pulse PFC control power supply module 140 also includes a diode V2 and a first resistor R1, wherein the anode of the diode V2 is connected to the switching power supply circuit module 100 through the first resistor R1, and the cathode of the diode V2 is connected to the electrolytic capacitor C1.

[0071] Specifically, the single-pulse PFC control power supply module 140 is also equipped with a diode and a first resistor. The anode of the diode is connected to the switching power supply circuit module 100 through the first resistor, and the cathode of the diode is connected to the electrolytic capacitor. In a specific embodiment, when the single-pulse PFC control power module 140 is charging, the switching power supply circuit module 100 can output voltage, and the current will flow to the diode through the first resistor. Due to the unidirectional conductivity of the diode, the current can only charge the electrolytic capacitor through the diode when the polarity of the voltage output by the switching power supply circuit module 100 makes the diode forward biased (i.e., the anode voltage is higher than the cathode voltage). During this process, the first resistor limits the size of the charging current to prevent excessive current from damaging the diode and the electrolytic capacitor. Furthermore, when the electrolytic capacitor is fully charged, a certain voltage will be established across its terminals. If the voltage output by the switching power supply circuit module 100 fluctuates or changes in the opposite direction, or if the single-pulse PFC control power module 140 is supplying power to the single-pulse PFC control module 130, the diode will be reverse biased and cut off, preventing the current from flowing in the opposite direction, thereby protecting the electrolytic capacitor.

[0072] In one embodiment of this utility model, combined with Figure 6 As shown, the single-pulse PFC control module 130 also includes a second switch V3 and a second resistor R2. One end of the second resistor R2 is connected to the isolation component B1, and the other end of the second resistor R2 is connected to the second switch V3.

[0073] Specifically, the single-pulse PFC control module 130 also includes a second switching transistor (IGBT) and a second resistor. One end of the second resistor is connected to the output side of an isolation component (such as an optocoupler isolator), and the other end of the second resistor is connected to the control terminal (usually the gate) of the second switching transistor. In a specific embodiment, the second resistor is a current-limiting resistor. Its main function is to limit the current flowing into the control terminal of the second switching transistor by its own resistance value, and keep it within a safe range to protect the second switching transistor. The second switching transistor can then precisely control the PFC function to start when current waveform correction is needed (such as when the input voltage and current are not synchronized) and to turn it off when no correction is needed (such as in standby or light load), so as to achieve power factor adjustment of the air conditioner 1.

[0074] According to the embodiment of the present invention, the air conditioner 1 connects the controller 71 to the single-pulse PFC control module 130 and the single-pulse PFC control power module 140. It can selectively send high-level signals and low-level signals to the single-pulse PFC control module 130 and the single-pulse PFC control power module 140 respectively. It can use its own existing power module to charge the single-pulse PFC control power module 140 and control the single-pulse PFC control power module 140 to supply power to the single-pulse PFC control module 130. Therefore, it is not necessary to add a separate transformer winding for the single-pulse PFC control module 130 to supply power, which reduces the number of windings, reduces the design difficulty and volume of the transformer, and reduces the design cost.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0076] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, include: A switching power supply circuit module, wherein the switching power supply circuit module is used to convert high voltage DC voltage into low voltage DC voltage; A single-pulse PFC control module, wherein the input terminal of the single-pulse PFC control module is connected to the output terminal of the switching power supply circuit module and the output terminal of the single-pulse PFC control power supply module respectively, and the single-pulse PFC control module is used to adjust the input current waveform to adjust the power factor of the air conditioner when the switching power supply circuit module or the single-pulse PFC control power supply module is powered. A motor control module, the input terminal of which is connected to the output terminal of the switching power supply circuit module, is used to invert the low-voltage DC voltage into AC voltage to control the operation of the compressor and the fan; A voltage multiplier circuit module, the input terminal of which is connected to the output terminal of the motor control module, is used to convert the AC voltage into DC voltage and increase the DC voltage value; The input terminal of the single-pulse PFC control power supply module is connected to the output terminal of the controller and the output terminal of the switching power supply circuit module, respectively. The single-pulse PFC control power supply module is used to charge the single-pulse PFC control module when it receives a high-level command from the controller, and to supply power to the single-pulse PFC control module when it receives a low-level command from the controller. The controller, whose output is connected to the input of the single-pulse PFC control module and the input of the single-pulse PFC control power supply module, is used to send high-level or low-level commands to the single-pulse PFC control module and the single-pulse PFC control power supply module to control the single-pulse PFC control power supply module to charge, or to control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module.

2. The air conditioner according to claim 1, characterized in that, The single-pulse PFC control power supply module includes a first switching transistor and an electrolytic capacitor, wherein the source of the first switching transistor is connected to a reference ground, the drain of the first switching transistor is connected to one end of the electrolytic capacitor, and the gate of the first switching transistor is connected to the controller.

3. The air conditioner according to claim 2, characterized in that, The single-pulse PFC control module includes an isolation component, a first end of which is connected to the controller, and a second end of which is connected to the PFC control power supply module. The isolation component is used to receive a level signal sent by the controller to control the circuit connection between the single-pulse PFC control power supply module and the single-pulse PFC control module.

4. The air conditioner according to claim 3, characterized in that, During the charging process of the single-pulse PFC control power module, the controller is configured to: The high-level command is sent to the gate of the first switching transistor, and the low-level signal is sent to the first terminal of the isolation component to control the single-pulse PFC control power module to charge.

5. The air conditioner according to claim 4, characterized in that, During the charging process of the single-pulse PFC control power module, the single-pulse PFC control power module is configured as follows: Upon receiving the high-level command, the first switch is turned on to charge the electrolytic capacitor. The single-pulse PFC control module is configured as follows: Upon receiving the low-level signal, the isolation component is controlled to disconnect, thereby shutting off the circuit between the single-pulse PFC control power supply module and the single-pulse PFC control module.

6. The air conditioner according to claim 3, characterized in that, During the process of controlling the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module, the controller is configured to: The high-level command is sent to the first terminal of the isolation component, and the low-level signal is sent to the gate of the first switching transistor to control the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module.

7. The air conditioner according to claim 6, characterized in that, During the process of controlling the single-pulse PFC control power supply module to supply power to the single-pulse PFC control module, the single-pulse PFC control power supply module is configured as follows: Upon receiving the low-level command, the first switch is turned off to stop charging the electrolytic capacitor; The single-pulse PFC control module is configured as follows: Upon receiving the high-level signal, the isolation component is controlled to conduct, thereby connecting the circuit between the single-pulse PFC control power supply module and the single-pulse PFC control module.

8. The air conditioner according to claim 3, characterized in that, The isolation component is an optical coupler.

9. The air conditioner according to claim 2, characterized in that, The single-pulse PFC control power supply module further includes a diode and a first resistor, wherein the anode of the diode is connected to the switching power supply circuit module through the first resistor, and the cathode of the diode is connected to the electrolytic capacitor.

10. The air conditioner according to claim 5, characterized in that, The single-pulse PFC control module further includes a second switching transistor and a second resistor, one end of the second resistor being connected to the isolation component and the other end of the second resistor being connected to the second switching transistor.

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