Air conditioner

Abstract

The air conditioner comprises a BUCK circuit with at least two voltage output ends and a voltage feedback end, a controller connected with the voltage output ends, an IPM module and a driving module arranged between the voltage output ends and the IPM module, the driving module is further electrically connected with the controller, the working voltage needed by the controller is first voltage, and the working voltage needed by the controller is second voltage. The working voltage required by the IPM module is a second voltage, the second voltage is greater than the first voltage, and when the voltage received by the IPM module does not reach a preset under-voltage protection value, the IPM module triggers under-voltage protection; when the air conditioner is powered on, the BUCK circuit starts to work, and when the output voltage reaches the first voltage, the controller starts to work; the output voltage of the BUCK circuit continues to be increased, the controller obtains the current output voltage value of the second voltage output end through the voltage feedback end, when the output voltage value does not reach the preset threshold value, the controller sends a first level signal to the driving module, the driving module is closed, and at the moment, the BUCK circuit does not supply power to the IPM module.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air conditioner. Background Art

[0002] At present, in the topology of the general BUCK circuit, the mains power is rectified and filtered, and then input into the BUCK circuit control chip, and the BUCK circuit outputs a predetermined voltage. In air conditioner products, the voltage is generally 15V, and then the 15V is stepped down to output 12V and 5V (or 3.3V, mainly controlling the MCU chip).

[0003] The above 15V generally corresponds to the control power supply of the IPM module of the compressor and fan. Since the IPM modules currently used all have undervoltage protection function, the protection logic is to check the power supply voltage on the control side. When the voltage is lower than a certain value, an undervoltage protection fault is reported. The above 12V generally corresponds to the various relay control power supplies of the air conditioner, and the above 5V generally corresponds to the control chip power supply of the controller.

[0004] During use, when the air conditioner is powered on, the BUCK circuit starts to output voltage. Since the output voltage reaches 5V first, that is, the controller completes power-on first, and the controller is reset after power-on, at this time, since the control power supply of the IPM module has not reached 15V, or even lower than the undervoltage protection value, the IPM module will report an undervoltage protection fault. When the MCU receives the undervoltage protection fault reported by the IPM module, it will perform corresponding interactive actions, that is, it will report fault information on the display screen or interactive APP. At the same time, the whole machine will be in a state where it cannot be started, and a false alarm fault will occur, affecting the use of the whole machine.

[0005] In the related art, it is proposed to use RC filtering for delay to control the start-up or disconnection time of the low-voltage BUCK circuit, but it still cannot accurately solve the problem of false triggering of undervoltage protection during the power-on process of the IPM module.

[0006] In view of this, this application is filed. Summary of the invention

[0007] The air conditioner provided in the present application adds a driving module electrically connected to the IPM module, so that the controller is connected to the voltage feedback end of the BUCK circuit to sample the output voltage, and controls whether to power the IPM module accordingly, effectively solving the two undervoltage conditions of the power-on process and abnormal voltage, avoiding the false triggering of the undervoltage protection of the IPM module, and improving the utilization efficiency of the entire machine.

[0008] The present application provides an air conditioner, comprising:

[0009] BUCK circuit, which is connected to the mains and used to supply power to some parts of the air conditioner;

[0010] At least two voltage output terminals, which are configured as output ports of the BUCK circuit, the voltage output terminals are used to output a set voltage to power other components, and the set voltages of different voltage output terminals are the same or different;

[0011] A controller electrically connected to the first voltage output terminal to receive a first voltage outputted by the corresponding voltage output terminal;

[0012] An IPM module, which is electrically connected to the second voltage output terminal to receive a second voltage outputted by the corresponding voltage output terminal, wherein the second voltage is greater than the first voltage, and when the voltage received by the IPM module does not reach a preset undervoltage protection value, the IPM module triggers undervoltage protection;

[0013] A voltage feedback terminal, which is configured as an output port of the BUCK circuit, the voltage feedback terminal is electrically connected to the second voltage output terminal, and the voltage feedback terminal is electrically connected to the controller to output the output voltage value of the second voltage output terminal to the controller;

[0014] A driving module is disposed between the IPM module and the second voltage output terminal, and the driving module is electrically connected to the controller. The driving module receives a level signal output by the controller to turn itself on or off, thereby controlling whether the IPM module is powered;

[0015] The controller is configured such that when the air conditioner is powered on, the BUCK circuit starts to work, the output voltage of the BUCK circuit increases, and when the output voltage of the first voltage output terminal reaches the first voltage, the controller starts to work;

[0016] The output voltage of the BUCK circuit continues to increase, and the controller obtains the current output voltage value of the second voltage output terminal through the voltage feedback terminal. When the output voltage value does not reach the preset threshold, the controller sends a first level signal to the driving module, the driving module is turned off, and the BUCK circuit does not power the IPM module.

[0017] In some embodiments of the present application, the controller is configured such that as the output voltage of the BUCK circuit continues to increase, when the output voltage value detected by the controller through the voltage feedback terminal reaches a preset threshold, the controller sends a second level to the driver chip, the driver module is turned on, and the receiving voltage of the IPM module increases to the second voltage.

[0018] In some embodiments of the present application, a preset time period is set during the power-on of the air conditioner. During the preset time period, the fault signal about undervoltage protection output by the IPM module is not detected, and the preset time period is greater than the time required for the receiving voltage of the IPM module to rise to the second voltage.

[0019] In some embodiments of the present application, after the IPM module is undervoltage and before the IPM module outputs an electrical signal regarding undervoltage protection, if the controller has received a fully powered-on signal, it determines that the IPM module is in an undervoltage state and immediately shuts down for protection.

[0020] In some embodiments of the present application, before the air conditioner is powered on, the first voltage received by the controller is 0V, the controller does not send a level signal to the driving module, the driving module is turned off, and the second voltage received by the IPM module is 0V.

[0021] In some embodiments of the present application, a plurality of IPM modules are provided, and the IPM modules can be electrically connected to the compressor, the indoor fan, and the outdoor fan.

[0022] In some embodiments of the present application, the IPM module is electrically connected to the compressor. When the outdoor unit of the air conditioner is in standby mode, the IPM module of the compressor does not work, and the controller cuts off the power supply of the corresponding IPM module by sending a first level signal to the driving module.

[0023] In some embodiments of the present application, the BUCK circuit includes:

[0024] A rectifier and filter circuit, which is electrically connected to the mains;

[0025] A BUCK chip electrically connected to the output end of the rectifier and filter circuit;

[0026] The feedback circuit has an input terminal electrically connected to an output terminal of the BUCK chip, and an output terminal of the feedback circuit is a voltage feedback terminal electrically connected to a feedback terminal of the BUCK chip. The output voltage of the BUCK chip is adjusted by adjusting the output duty cycle of the BUCK chip.

[0027] In some embodiments of the present application, the BUCK circuit further includes a decoupling capacitor, which is connected in series between the power supply terminal and the ground terminal of the IPM module to suppress noise in the received second voltage.

[0028] The embodiment of the present application also provides an air conditioner, comprising:

[0029] A BUCK circuit, which is connected to the mains and is used to supply power to some components of the air conditioner. The BUCK circuit includes a BUCK chip;

[0030] At least two voltage output terminals, which are configured as output ports of the BUCK circuit, the voltage output terminals are used to output a set voltage to power other components, and the set voltages of different voltage output terminals are the same or different;

[0031] A controller electrically connected to the first voltage output terminal to receive a first voltage outputted by the corresponding voltage output terminal;

[0032] An IPM module, which is electrically connected to the second voltage output terminal to receive a second voltage outputted by the corresponding voltage output terminal, wherein the second voltage is greater than the first voltage, and when the voltage received by the IPM module does not reach a preset undervoltage protection value, the IPM module triggers undervoltage protection;

[0033] a feedback circuit, which receives the output voltage value output by the second voltage output terminal and sends it to the controller;

[0034] A driving module is provided between the IPM module and the corresponding voltage output terminal, and the driving module is electrically connected to the controller. The driving module receives the level signal output by the controller to realize its own opening or closing, thereby controlling whether the IPM module is powered;

[0035] The controller is configured such that when the air conditioner is powered on, the BUCK circuit starts to work, the output voltage of the BUCK chip increases, and when the output voltage of the first voltage output terminal reaches the first voltage, the controller starts to work;

[0036] The output voltage of the BUCK chip continues to increase, and the controller obtains the current output voltage value of the second voltage output terminal through the feedback circuit. When the output voltage value does not reach the preset threshold, the controller sends a first level signal to the driving module, the driving module is turned off, and the BUCK circuit does not power the IPM module.

[0037] In the above embodiments, the air conditioner proposed in the present application utilizes a BUCK circuit to power some components of the air conditioner. The BUCK circuit includes at least two voltage output terminals and a voltage feedback terminal. The voltage output terminal is used to output a set voltage to power other components. The set voltages of different voltage output terminals are the same or different. The air conditioner also includes a controller and an IPM module connected to the voltage output terminal. The required working voltage of the controller is a first voltage, and the required working voltage of the IPM module is a second voltage. The second voltage is greater than the first voltage. When the voltage received by the IPM module does not reach the preset undervoltage protection value, the IPM module triggers the undervoltage protection. In order to solve the problem of false triggering of the undervoltage protection of the IPM module during the power-on process, the present application adds a driving module, which is arranged between the IPM module and the second voltage output terminal, and the driving module is electrically connected to the controller. The controller receives the voltage value of the voltage feedback terminal and sends a level signal value to the driving module accordingly to control the opening or closing of the driving module. When the air conditioner is powered on, the BUCK circuit starts to work, and when the output voltage of the BUCK circuit reaches the first voltage, the controller starts to work; the output voltage of the BUCK circuit continues to increase, and the controller obtains the current output voltage value of the second voltage output terminal through the voltage feedback terminal. When the output voltage value does not reach the preset threshold, the controller sends a first level signal to the driving module, and the driving module is turned off. At this time, the BUCK circuit does not supply power to the IPM module. Through the above-mentioned setting, during the power-on process, the controller sends a level signal to the driving module to control whether the IPM module is powered on, so as to avoid misjudgment of faults in the IPM module during the power-on process and improve the working efficiency of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 is a hardware configuration block diagram of an air conditioner provided according to an exemplary embodiment;

[0040] Figure 2 is another hardware configuration block diagram of an air conditioner provided according to an exemplary embodiment;

[0041] Figure 3 is another hardware configuration block diagram of an air conditioner provided according to an exemplary embodiment;

[0042] Figure 4 is another circuit structure diagram of an air conditioner provided according to an exemplary embodiment;

[0043] Figure 5 A hardware configuration block diagram of a controller provided according to an exemplary embodiment;

[0044] Figure 6 A power supply logic for an IPM module provided according to an exemplary embodiment;

[0045] Figure 7 A control logic for undervoltage protection of an IPM module during power-up provided according to an exemplary embodiment;

[0046] Figure 8 Control logic for different undervoltage conditions provided according to exemplary embodiments;

[0047] Fig. 9 A power supply logic for an IPM module provided according to an exemplary embodiment;

[0048] Fig.10 A control logic for an air conditioner provided according to an exemplary embodiment;

[0049] Fig.11 A hardware configuration block diagram of a BUCK circuit provided according to an exemplary embodiment;

[0050] In the above figures:

[0051] BUCK circuit 1; IPM module 2; controller 4; first voltage output terminal 11; second voltage output terminal 12;

[0052] Driving module 3; feedback circuit 13; voltage feedback terminal 131;

[0053] Rectification and filtering circuit 14; BUCK chip 15; step-down circuit 16; mains power 5;

[0054] Processor 83; memory 82; communication interface 84; bus 81. DETAILED DESCRIPTION

[0055] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0056] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] The terms "first", "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly include one or more of the features.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] An embodiment of the present application provides an air conditioner, which includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0060] The refrigeration system includes a compressor, a condenser, an expansion valve and an evaporator. In this application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0061] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0062] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor.

[0063] The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0064] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0065] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0066] The air conditioner in the present application can be configured as an integrated unit or a split unit, and can be configured as a cabinet unit or a wall mounted unit.

[0067] Taking an indoor wall mounted unit (not shown in the figure) as an example, the indoor wall mounted unit is usually installed at a location such as an indoor wall. For another example, an indoor cabinet unit (not shown in the figure) is also a form of indoor unit.

[0068] Taking a split unit as an example, the air conditioner includes an indoor unit and an outdoor unit, wherein the outdoor unit is usually installed outdoors and is used for heat exchange in the indoor environment.

[0069] In addition, the air conditioner is provided with a controller 4 to control the operation of various components in the air conditioner so that the various components of the air conditioner can operate to realize various predetermined functions of the air conditioner.

[0070] The air conditioner is also provided with a control device 5, which is exemplarily configured as a remote controller, which has the function of communicating with the controller 4 using infrared or other communication methods. The remote controller is used for the user to perform various controls on the air conditioner and realize the interaction between the user and the air conditioner.

[0071] In the embodiment shown in the present application, the controller 4 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner to execute the control instruction. For example, in response to receiving a power-on or power-off instruction issued by the user, the controller 4 can perform an operation related to the object selected by the power-on or power-off instruction.

[0072] The present application embodiment also provides a hardware structure diagram of a controller 4, such as Figure 5 As shown, the controller 4 includes a processor 83, and optionally, further includes a memory 82 and a communication interface 8 connected to the processor 83. The processor 83, the memory 82 and the communication interface 8 are connected via a bus 81.

[0073] The processor 83 may be a central processing unit 83 (CPU), a general processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 4, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor 83 or a multi-CPU processor 83. The processor 83 here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0074] The memory 82 may be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, and the present embodiment of the application does not impose any restrictions on this. The memory 82 may exist independently or be integrated with the processor 83. Among them, the memory 82 may contain a computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby realizing the control method of the multi-split air conditioner 100 system provided in the embodiment of the present application.

[0075] The communication interface 8 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 8 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0076] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. For ease of representation, Figure 4 Although only one thick line is used in the figure, it does not mean that there is only one bus 81 or only one type of bus 81.

[0077] In the embodiment of the present application, the air conditioner further comprises an indoor fan and an outdoor fan, wherein the indoor fan is arranged in the indoor unit to accelerate the airflow in the indoor unit and improve the heat exchange efficiency. The outdoor fan is arranged in the outdoor unit to accelerate the airflow in the outdoor unit and improve the heat exchange efficiency.

[0078] In this embodiment, in order to better drive the compressor, indoor fan, outdoor fan and other components that require external power to work, the above components are connected to the IPM (Intelligent Power Module) module to improve the working efficiency of the motors of the compressor, indoor fan and outdoor fan.

[0079] It should be noted that the IPM module 2 integrates a power switch device and a drive circuit, and also integrates a fault detection circuit such as overvoltage, undervoltage, overcurrent and overheating, and can send a detection signal to the controller 4.

[0080] The specific implementation method of the undervoltage protection fault of IPM module 2 is as follows:

[0081] By comparing whether the input voltage (power supply voltage) of the IPM module 2 is lower than the preset undervoltage protection value, when the input voltage of the IPM module 2 is lower than the preset undervoltage protection value, the IPM module 2 will trigger the undervoltage protection and perform corresponding interactive actions. In some embodiments, fault information will be reported on the display screen or the interactive APP, making the whole machine unable to start.

[0082] It can be known that the above-mentioned IPM module 2 and controller 4 both need power supply to work. Due to their own working voltage requirements, they cannot be directly connected to the mains. Figure 1 It is necessary to set a BUCK circuit 1 between the mains and the power supply ends of the IPM module 2 and the controller 4, which provides different operating voltages to different components of the air conditioner.

[0083] In some implementations of this embodiment, refer to Fig.11The BUCK circuit 1 includes a rectifier and filter circuit 14 , a BUCK chip 15 , a feedback circuit 13 and a step-down circuit 16 .

[0084] The input end of the rectifier and filter circuit 14 is connected to the mains power supply, and is used to convert the alternating current of the mains power supply into direct current, and supply the direct current to the BUCK chip 15 .

[0085] The BUCK chip 15 can adjust the received direct current to a preset voltage. For example, the BUCK chip 15 can output a voltage of 15V.

[0086] The input and output ends of the feedback circuit 13 are electrically connected to the BUCK chip 15 . Specifically, the input end of the feedback circuit 13 is electrically connected to the voltage output end of the BUCK chip 15 , and the output end (voltage feedback end 131 ) of the feedback circuit 13 is electrically connected to the feedback end of the BUCK chip 15 .

[0087] The feedback circuit 13 is used for receiving the output voltage of the BUCK chip 15 and feeding back the output voltage to a voltage feedback terminal 131 of the BUCK chip 15 , so as to adjust the output voltage of the BUCK chip 15 by adjusting the output duty cycle of the BUCK chip 15 .

[0088] The step-down circuit 16 is electrically connected to the output terminal of the BUCK chip 15. By setting a voltage divider circuit, voltage output terminals with different values ​​can be obtained.

[0089] The step-down circuit 16 includes at least two voltage output terminals, and the voltage output terminals can output the voltage values ​​required by the corresponding components to power the components of the air conditioner by setting the circuit. It can be known that the output voltages of different voltage output terminals can be set to be the same or different to flexibly meet the needs of different components.

[0090] For example, refer to Figure 4 The buck circuit 16 can be configured to be composed of a low dropout regulator (LDO) to step down the voltage output by the BUCK chip 15 to a desired voltage. In some embodiments, the buck circuit 16 includes at least two LDOs to obtain three different voltage output values ​​in the BUCK circuit 1.

[0091] In some implementations of this embodiment, a decoupling capacitor is further included. The decoupling capacitor is connected in series between the power supply terminal and the ground terminal of the IPM module 2 to suppress noise on the power supply.

[0092] In some implementations of this embodiment, the controller 4 is connected to one of the voltage output terminals (the first voltage output terminal 11) of the BUCK circuit 1 to receive a first voltage outputted by the voltage output terminal. Exemplarily, the first voltage is 5V or 3.3V.

[0093] The IPM module 2 is connected to one of the voltage output terminals (the second voltage output terminal 12) of the BUCK module that is not connected to the controller 4 to receive the second voltage output by the voltage output terminal. Exemplarily, the second voltage is 15V.

[0094] It should be noted that the second voltage is greater than the first voltage.

[0095] During the power-on process of the air conditioner, since the output voltage of the BUCK circuit 1 gradually increases, the output voltage of the BUCK circuit 1 first reaches the first voltage, so that the controller 4 can be powered on. Then, during the process of the BUCK circuit 1 continuing to rise, due to the undervoltage protection function of the IPM module 2 itself, it will be mistakenly determined that the IPM module 2 is in an undervoltage state during the power-on process, thereby affecting the operation of the entire machine.

[0096] In order to solve the problem of false triggering of undervoltage protection of the IPM module 2 during the power-on process, in some implementations of this embodiment, refer to Figure 3-4 A driving module 3 is added to the air conditioner, and the driving module 3 is electrically connected to the IPM module 2 and the controller 4.

[0097] Specifically, the control end of the driving module 3 is electrically connected to the controller 4 , and the driving module 3 can receive a level signal from the controller 4 to turn itself on or off.

[0098] The driving module 3 is arranged between the IPM module 2 and the second voltage output terminal 12 of the BUCK circuit 1, and the power supply terminal of the driving module 3 is electrically connected to the second voltage output terminal 12 to receive the output voltage of the voltage output terminal; the output terminal of the driving module 3 is electrically connected to the power supply terminal of the IPM module 2 to supply the second voltage to the IPM module 2 so that the IPM module 2 can work.

[0099] It should be noted that, in the technical solution of the present application, the voltage outputted by the voltage output terminal connected to the driving circuit is consistent with the voltage required by the IPM module 2 , that is, the second voltage, so as to power the IPM module 2 .

[0100] At the same time, in order to enable the controller 4 to adjust the working state of the driving module 3 according to the output voltage of the BUCK circuit 1, one of the input terminals of the controller 4 is electrically connected to the voltage feedback terminal 131 of the BUCK circuit 1. The controller 4 can control the working state of the driving module 3 according to the output voltage output level signal (high level or low level) output by the voltage feedback terminal 131 of the BUCK circuit 1 received, so as to control whether to power the IPM module 2.

[0101] Based on the above, the controller 4 is configured such that when the air conditioner is powered on, the BUCK circuit 1 starts to work, and when the output voltage of the BUCK circuit 1 reaches the first voltage, the controller 4 starts to work.

[0102] During the power-on process, the output voltage of the BUCK circuit 1 continues to increase, and the controller 4 can obtain the output voltage value of the second voltage output terminal 12 through the voltage feedback terminal 131. When the output voltage value does not reach the preset threshold, the controller 4 sends a first level signal to the driving module 3 to control the driving module 3 to turn off. At this time, the BUCK circuit 1 does not supply power to the IPM module 2.

[0103] Through the above settings, when the air conditioner is powered on, the BUCK circuit 1 is connected to the mains, and the output voltage value of the BUCK circuit 1 will gradually increase. Since the first voltage is less than the second voltage, the output voltage of the BUCK circuit 1 will first reach the first voltage, so that the controller 4 can be powered on and work.

[0104] The controller 4 detects the state of the output voltage and controls whether to supply power to the IPM module 2, thereby effectively avoiding the situation in which directly supplying power to the IPM module 2 during the period when the air conditioner reaches the first voltage but has not reached the second voltage triggers the undervoltage protection of the IPM module 2 itself, thereby affecting the operation of other components or even the entire machine.

[0105] Through the above steps, the two states of power-on undervoltage and abnormal undervoltage are effectively distinguished, and the problem of false triggering of undervoltage protection of the IPM module 2 during the power-on process is effectively reduced.

[0106] In some implementations of this embodiment, the controller 4 is configured such that, as the output voltage of the BUCK circuit 1 continues to increase, when the output voltage value detected by the controller 4 via the voltage feedback terminal 131 reaches a preset threshold, the controller 4 sends a second level to the driving module 3, the driving module 3 is turned on, and power is supplied to the IPM module 2, and the power supply voltage of the IPM module 2 gradually increases to the second voltage.

[0107] By detecting the output voltage of the BUCK circuit 1 to control whether to supply power to the IPM module 2, the power supply voltage of the IPM module 2 can be increased to the second voltage in a short time, thereby avoiding erroneous judgment of undervoltage protection and ensuring the normal operation of the IPM module 2.

[0108] Reference Figure 6 , illustrating the power supply logic of the IPM module 2 in the embodiment of the present application.

[0109] The air conditioner starts to power on (step S601);

[0110] Determine whether the output voltage value of the first voltage output terminal 11 reaches the first voltage (step S602);

[0111] In step S602, if the output voltage value of the first voltage output terminal 11 reaches the first voltage value, step S603 is executed, and the controller 4 starts working;

[0112] In step S602, if the output voltage value of the first voltage output terminal 11 does not reach the first voltage value, step S602 is executed;

[0113] After executing step S603, executing step S604, determining whether the voltage value sent by the voltage feedback terminal 131 reaches a preset threshold;

[0114] In step S604, if the voltage value reaches the preset threshold, step S605 is executed, the controller 4 sends a high level to the driving module 3, the driving module 3 is turned on, and the BUCK circuit 1 supplies power to the IPM module 2 (step S608);

[0115] In step S604 , if the voltage value does not reach the preset threshold, step S606 is executed, the controller 4 sends a low level to the driving module 3 ; the driving module 3 is turned off, and the BUCK circuit 1 does not supply power to the IPM module 2 (step S607 ).

[0116] After executing step S607 , step S604 may be executed again to determine whether the voltage value fed back by the voltage feedback terminal 131 reaches a preset threshold value, so as to complete the power supply to the IPM module 2 .

[0117] In some embodiments of the present application, during the power-on process of the air conditioner, the BUCK circuit 1 starts working, and the output voltage of the voltage output port of the BUCK chip 15 increases. When the output voltage of the BUCK circuit 1 reaches the first voltage, the controller 4 starts working; when the output voltage of the BUCK chip 15 continues to increase, the controller 4 obtains the current output voltage value of the second voltage output terminal 12 through the feedback circuit 13. When the output voltage value does not reach the preset threshold, the controller 4 sends a first level signal to the driving module 3, the driving module 3 is turned off, and the BUCK circuit 1 is controlled not to supply power to the IPM module 2.

[0118] Reference Fig. 9 , illustrating the power supply logic of the IPM module 2 in the embodiment of the present application.

[0119] The air conditioner starts to power on (step S901);

[0120] Determine whether the output voltage value of the first voltage output terminal 11 reaches the first voltage (step S902);

[0121] In step S902, if the output voltage value of the first voltage output terminal 11 reaches the first voltage value, step S903 is executed, and the controller 4 starts to work;

[0122] In step S902, if the output voltage value of the first voltage output terminal 11 does not reach the first voltage value, then step S902 is executed;

[0123] After executing step S903, executing step S904, determining whether the voltage value output by the feedback circuit 13 reaches a preset threshold;

[0124] In step S904, if the voltage value reaches the preset threshold, step S905 is executed, the controller 4 sends a high level to the driving module 3, the driving module 3 is turned on, and the BUCK circuit 1 supplies power to the IPM module 2 (step S908);

[0125] In step S904 , if the voltage value does not reach the preset threshold, step S906 is executed, the controller 4 sends a low level to the driving module 3 ; the driving module 3 is turned off, and the BUCK circuit 1 does not supply power to the IPM module 2 (step S907 ).

[0126] After executing step S907 , step S904 may be executed again to determine whether the voltage value output by the feedback circuit 13 reaches a preset threshold value, so as to complete the power supply to the IPM module 2 .

[0127] In the present application, the output voltage of the BUCK circuit 1 is sampled to control whether the second voltage (exemplarily, 15V) is output to the back-end IPM module 2, and the control logic is changed to determine whether the air conditioner is in the initial power-on state or the abnormal undervoltage state.

[0128] The feedback circuit 13 in the BUCK circuit 1 is generally used to feed back to the BUCK chip 15, so as to adjust the output voltage value of the BUCK chip 15 by adjusting the output duty cycle of the BUCK chip 15. In the present application, not only the feedback circuit 13 is fed back to the BUCK chip 15, but also the data of the feedback circuit 13 is transmitted to the controller 4, and at the same time, a driving module 3 is added between the IPM module 2 and the BUCK circuit 1, and the driving module 3 is controlled by the controller 4. Exemplarily, the driving module 3 can be set as a driving chip.

[0129] The controller 4 determines this part of the voltage signal to control, through the driving module 3, whether the second voltage signal can be output to the IPM module 2 for power supply.

[0130] In some implementations of this embodiment, a preset time period is set during the power-on of the air conditioner. During the preset time period, the fault signal about undervoltage protection output by the IPM module 2 is not detected, and the preset time period is greater than the time required for the receiving voltage of the IPM module 2 to rise to the second voltage.

[0131] It can be known that when the driving module 3 is turned on, the receiving voltage of the IPM module 2 will gradually increase to 15V, and at this time, the receiving voltage of the IPM module 2 has a very short change process from 0V to 15V. Generally speaking, the time required for this change process is less than the undervoltage protection detection time of the IPM module 2.

[0132] In the technical solution of the present application, a preset time period is still preset in the program control, and during this time period, the fault signal of the IPM module 2 is not detected. This setting can reduce the probability of misjudgment from the IPM module 2 itself.

[0133] Reference Figure 7 , illustrating the control logic of undervoltage protection of IPM module 2 during power-on.

[0134] The air conditioner starts to power on (step S701);

[0135] Determine whether the output voltage value of the first voltage output terminal 11 reaches the first voltage (step S702);

[0136] In step S702, if the output voltage value of the first voltage output terminal 11 reaches the first voltage value, step S703 is executed, and the controller 4 starts to work;

[0137] In step S702, if the output voltage value of the first voltage output terminal 11 does not reach the first voltage value, step S702 is executed;

[0138] After executing step S703, executing step S704, determining whether the voltage value sent by the voltage feedback terminal 131 reaches a preset threshold;

[0139] In step S704, if the voltage value reaches the preset threshold, step S705 is executed, the controller 4 sends a high level to the driving module 3, the driving module 3 is turned on, and the BUCK circuit 1 starts to supply power to the IPM module 2 (step S708);

[0140] In step S704 , if the voltage value does not reach the preset threshold, step S706 is executed, the controller 4 sends a low level to the driving module 3 ; the driving module 3 is turned off, and the BUCK circuit 1 does not supply power to the IPM module 2 (step S707 ).

[0141] After executing step S707, step S704 may be executed again;

[0142] After executing step S708, it is determined whether the power-on time of the IPM module 2 reaches a preset time period (step S709);

[0143] In step S709, if the power-on time of the IPM module 2 reaches the preset time period, step S710 is executed to determine whether the receiving voltage of the IPM module 2 reaches the preset threshold;

[0144] In step S710, if the receiving voltage of the IPM module 2 reaches the preset threshold, step S711 is executed, and the IPM module 2 is powered on normally;

[0145] In step S710, if the receiving voltage of the IPM module 2 does not reach the preset threshold, step S712 is executed, and the IPM module 2 sends a fault signal about undervoltage protection;

[0146] In step S709, if the power-on time of the IPM module 2 does not reach the preset time period, step S709 is executed.

[0147] In some implementations of this embodiment, after the IPM module 2 is undervoltage and before the IPM module 2 outputs a fault signal regarding undervoltage protection, if the controller 4 has received a fully powered-on signal, it determines that the IPM module 2 is in an undervoltage state and immediately performs shutdown protection.

[0148] Based on the above scheme, when the IPM module 2 is in an undervoltage state, but before the IPM module 2 itself sends a fault signal about the undervoltage protection, if the controller 4 has confirmed that it is fully powered on, then at this time the controller 4 can directly determine that the IPM module 2 is in an undervoltage state and immediately shut down for protection. There is no need to wait for the preset time period for the IPM module 2 to perform undervoltage detection before performing protection, thereby effectively protecting the operating reliability of the IPM module 2.

[0149] At the same time, when the IPM module 2 is under-voltage protection, the voltage fed back by the feedback circuit 13 detected by the controller 4 is lower than the preset threshold value. At this time, the controller 4 cuts off the output of the IPM module 2, and the receiving voltage of the IPM module 2 is also 0. At the same time, the control signal output by the driving module 3 is at a low level, and the IPM module 2 will not work. Even if there are other abnormal interferences in the control signal of the IPM, it will not cause the IPM module 2 to be misconnected.

[0150] Reference Figure 8 , explaining the control logic of different undervoltage states in this application.

[0151] Determine whether the voltage received by the power supply end of the IPM module 2 reaches a preset undervoltage protection value (step S801);

[0152] In step S801, if the voltage received by the power supply end of the IPM module 2 reaches the preset undervoltage protection value, step S803 is executed and the undervoltage protection is not triggered;

[0153] In step S801, if the voltage received by the power supply end of the IPM module 2 does not reach the preset undervoltage protection value, step S802 is executed to determine whether the controller 4 receives a full power-on signal;

[0154] In step S802, if the controller 4 receives a fully powered-on signal, step S804 is executed without triggering the undervoltage protection;

[0155] In step S802 , if the controller 4 does not receive a full power-on signal, step S805 is executed to trigger undervoltage protection.

[0156] In some implementations of this embodiment, before the air conditioner is powered on, the first voltage received by the controller 4 is 0V, the controller 4 does not send a level signal to the driving module 3, the driving module 3 is turned off, and the second voltage received by the IPM module 2 is 0V.

[0157] Reference Fig.10 , illustrating the control logic of the air conditioner in the embodiment of the present application.

[0158] Whether to power on the air conditioner (step S1009);

[0159] In step S1009, if the air conditioner is not powered on, step S1010 is executed, the controller 4 is not powered on, the drive module 3 is turned off, and the IPM module 2 is not powered on;

[0160] In step S1009, if the air conditioner is powered on, step S1001 is executed to start powering on the air conditioner;

[0161] Determine whether the output voltage value of the first voltage output terminal 11 reaches the first voltage (step S1002);

[0162] In step S1002, if the output voltage value of the first voltage output terminal 11 reaches the first voltage value, step S1003 is executed, and the controller 4 starts to work;

[0163] In step S1002, if the output voltage value of the first voltage output terminal 11 does not reach the first voltage value, step S1002 is executed;

[0164] After executing step S1003, executing step S1004, determining whether the voltage value sent by the voltage feedback terminal 131 reaches a preset threshold;

[0165] In step S1004, if the voltage value reaches the preset threshold, step S1005 is executed, the controller 4 sends a high level to the driving module 3, the driving module 3 is turned on, and the BUCK circuit 1 supplies power to the IPM module 2 (step S1008);

[0166] In step S1004 , if the voltage value does not reach the preset threshold, step S1006 is executed, the controller 4 sends a low level to the driving module 3 ; the driving module 3 is turned off, and the BUCK circuit 1 does not supply power to the IPM module 2 (step S1007 ).

[0167] After executing step S1007 , step S1004 may be executed again to determine whether the voltage value fed back by the voltage feedback terminal 131 reaches a preset threshold value, so as to complete the power supply to the IPM module 2 .

[0168] In some implementations of this embodiment, when the IPM module 2 in the present application is electrically connected to the compressor, when the outdoor unit of the air conditioner is in standby mode, the IPM module 2 of the compressor does not work, and the controller 4 cuts off the power supply of the above-mentioned IPM module 2 by sending a first level signal to the driving module 3.

[0169] Specifically, when the outdoor unit of the variable frequency air conditioner is in standby mode, the IPM module 2 of the compressor is not working, and the controller 4 can control the cutting off of the 15V power supply voltage, so that the 15V load is reduced, which plays a role in reducing losses, saving energy, reducing the heat generation of the BUCK chip 15, and increasing the life of the BUCK chip 15 and the output capacitor and LDO chip.

[0170] In some implementations of this embodiment, the air conditioner further includes a display screen, which can display the current working status, energy consumption and whether there is a fault of the air conditioner, so that the user can understand the working status of the air conditioner.

[0171] In some implementations of this embodiment, the air conditioner can be connected to a mobile device. For example, the mobile device is set to be a mobile phone or a tablet. The user can interact with the air conditioner through an APP on the mobile device, send instructions to the air conditioner, and receive fault alarms issued by the air conditioner.

[0172] In some implementations of this embodiment, more than two voltage output terminals may be provided to supply power to other components. For example, a relay may be powered.

[0173] The air conditioner proposed in the present application utilizes a BUCK circuit 1 to power some components of the air conditioner. The BUCK circuit 1 includes at least two voltage output terminals and a voltage feedback terminal 131. The voltage output terminal is used to output a set voltage to power other components. The set voltages of different voltage output terminals are the same or different. The air conditioner also includes a controller 4 and an IPM module 2 connected to the voltage output terminal. The required working voltage of the controller 4 is a first voltage, and the required working voltage of the IPM module 2 is a second voltage. The second voltage is greater than the first voltage. When the voltage received by the IPM module 2 does not reach the preset undervoltage protection value, the IPM module 2 triggers the undervoltage protection. In order to solve the problem of false triggering of the undervoltage protection of the IPM module 2 during the power-on process, the present application adds a driving module 3, which is arranged between the IPM module 2 and the second voltage output terminal 12, and the driving module 3 is electrically connected to the controller 4. The controller 4 receives the voltage value of the voltage feedback terminal 131 and sends a level signal value to the driving module 3 accordingly to control the opening or closing of the driving module 3. When the air conditioner is powered on, the BUCK circuit 1 starts to work, and when the output voltage of the BUCK circuit 1 reaches the first voltage, the controller 4 starts to work; the output voltage of the BUCK circuit 1 continues to increase, and the controller 4 obtains the current output voltage value of the second voltage output terminal 12 through the voltage feedback terminal 131. When the output voltage value does not reach the preset threshold, the controller 4 sends a first level signal to the driving module 3, and the driving module 3 is turned off. At this time, the BUCK circuit 1 does not supply power to the IPM module 2. Through the above-mentioned setting, during the power-on process, the controller 4 sends a level signal to the driving module 3 to control whether the IPM module 2 is powered, so as to avoid misjudgment of the fault of the IPM module 2 during the power-on process and improve the working efficiency of the whole machine.

[0174] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: A BUCK circuit, which is connected to the mains and is used to supply power to some components of the air conditioner; At least two voltage output terminals, which are configured as output ports of the BUCK circuit, the voltage output terminals are used to output a set voltage to power other components, and the set voltages of different voltage output terminals are the same or different; A controller electrically connected to the first voltage output terminal to receive a first voltage outputted by the corresponding voltage output terminal; An IPM module, which is electrically connected to the second voltage output terminal to receive a second voltage outputted by the corresponding voltage output terminal, wherein the second voltage is greater than the first voltage, and when the voltage received by the IPM module does not reach a preset undervoltage protection value, the IPM module triggers undervoltage protection; a voltage feedback terminal, which is configured as an output port of the BUCK circuit, the voltage feedback terminal is electrically connected to the second voltage output terminal, and the voltage feedback terminal is electrically connected to the controller to output the output voltage value of the second voltage output terminal to the controller; A driving module, which is disposed between the IPM module and the second voltage output terminal, and the driving module is electrically connected to the controller, and the driving module receives a level signal output by the controller to realize its own opening or closing, thereby controlling whether the IPM module is powered; The controller is configured such that when the air conditioner is powered on, the BUCK circuit starts to work, the output voltage of the BUCK circuit increases, and when the output voltage of the first voltage output terminal reaches the first voltage, the controller starts to work; The output voltage of the BUCK circuit continues to increase, and the controller obtains the current output voltage value of the second voltage output terminal through the voltage feedback terminal. When the output voltage value does not reach the preset threshold, the controller sends a first level signal to the driving module, the driving module is turned off, and the BUCK circuit does not power the IPM module.

2. The air conditioner according to claim 1, characterized in that: The controller is configured such that, as the output voltage of the BUCK circuit continues to increase, when the output voltage value detected by the voltage feedback terminal of the controller reaches a preset threshold, the controller sends a second level to the driving module, the driving module is turned on, and the receiving voltage of the IPM module increases to the second voltage.

3. The air conditioner according to claim 1 or 2, characterized in that: A preset time period is set during the power-on of the air conditioner. During the preset time period, the fault signal about undervoltage protection output by the IPM module is not detected. The preset time period is greater than the time required for the receiving voltage of the IPM module to rise to the second voltage.

4. The air conditioner according to claim 3, characterized in that: When the IPM module is undervoltage and before the IPM module outputs a fault signal for undervoltage protection, if the controller has received a fully powered-on signal, it determines that the IPM module is in an undervoltage state and immediately shuts down for protection.

5. The air conditioner according to claim 1, characterized in that: Before the air conditioner is powered on, the first voltage received by the controller is 0V, the controller does not send a level signal to the driving module, the driving module is turned off, and the second voltage received by the IPM module is 0V.

6. The air conditioner according to any one of claims 1-2, 4-5, characterized in that: The IPM module is provided in plurality, and the IPM module can be electrically connected to the compressor, the indoor fan, and the outdoor fan.

7. The air conditioner according to claim 6, characterized in that: The IPM module is electrically connected to the compressor. When the outdoor unit of the air conditioner is in a standby state, the IPM module of the compressor does not work, and the controller cuts off the power supply of the IPM module by sending a first level signal to the driving module.

8. The air conditioner according to claim 1, characterized in that: The BUCK circuit comprises: A rectifier and filter circuit, which is electrically connected to the mains; A BUCK chip electrically connected to the output end of the rectifying and filtering circuit; A feedback circuit, wherein an input end of the feedback circuit is electrically connected to an output end of the BUCK chip, an output end of the feedback circuit is the voltage feedback end, and the voltage feedback end is electrically connected to a feedback end of the BUCK chip, and an output voltage of the BUCK chip is adjusted by adjusting an output duty cycle of the BUCK chip.

9. The air conditioner according to claim 1, characterized in that: The BUCK circuit also includes a decoupling capacitor connected in series between the power supply terminal and the ground terminal of the IPM module to suppress noise in the received second voltage.

10. An air conditioner, characterized in that: include: A BUCK circuit, which is connected to the mains and is used to power some components of the air conditioner, and the BUCK circuit includes a BUCK chip and a step-down circuit connected to a voltage output port of the BUCK chip; At least two voltage output terminals, which are configured as output ports of the step-down circuit, the voltage output terminals are used to output a set voltage to power other components, and the set voltages of different voltage output terminals are the same or different; A controller electrically connected to the first voltage output terminal to receive a first voltage outputted by the corresponding voltage output terminal; An IPM module, which is electrically connected to the second voltage output terminal to receive a second voltage outputted by the corresponding voltage output terminal, wherein the second voltage is greater than the first voltage, and when the voltage received by the IPM module does not reach a preset undervoltage protection value, the IPM module triggers undervoltage protection; a feedback circuit, which receives the output voltage value output by the second voltage output terminal and sends it to a controller; A driving module, which is disposed between the IPM module and the corresponding voltage output terminal, and the driving module is electrically connected to the controller, and the driving module receives the level signal output by the controller to realize its own opening or closing, thereby controlling whether the IPM module is powered; The controller is configured such that when the air conditioner is powered on, the BUCK circuit starts to work, the output voltage of the BUCK chip increases, and when the output voltage of the first voltage output terminal reaches the first voltage, the controller starts to work; The output voltage of the BUCK chip continues to increase, and the controller obtains the current output voltage value of the second voltage output terminal through the feedback circuit. When the output voltage value does not reach the preset threshold, the controller sends a first level signal to the driving module, the driving module is turned off, and the BUCK circuit does not power the IPM module.

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