Household appliance and frequency conversion control method

Abstract

The invention is suitable for the technical field of frequency conversion control, and provides a household appliance and a frequency conversion control method, the method is applied to a frequency conversion controller in the household appliance, the household appliance further comprises a motor, and the method comprises the following steps: when a rotating speed adjusting event of the motor is triggered, the rotating speed of the motor is adjusted; switching frequency matched with the adjusted rotating speed of the motor is determined, target switching frequency is obtained, and when the variable frequency controller outputs pulses based on the adjusted rotating speed and the target switching frequency, leakage current generated by the household appliance does not reach a set current threshold value; and outputting a pulse to the motor according to the adjusted rotating speed and the target switching frequency, wherein the pulse is used for driving the motor. According to the invention, the probability of false triggering of the ground fault circuit breaker by the variable-frequency household appliance can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of frequency conversion control, and in particular to a household appliance and a frequency conversion control method. Background Art

[0002] In order to avoid serious electric shock accidents, users usually need to install ground fault circuit breakers in their homes. When the leakage current of the circuit in the user's home reaches the trigger value of the ground fault circuit breaker, the ground fault circuit breaker is triggered and the circuit is automatically disconnected, that is, tripping occurs.

[0003] Affected by the switching frequency, household appliances usually generate additional high-frequency leakage current during operation. When the motor speed of the household appliances changes, it may cause the household appliances to generate even greater high-frequency leakage current. However, relevant safety standards such as the safety standard UL943 only consider the impact of the power frequency leakage current, and do not consider the impact of the high-frequency leakage current. As a result, the high-frequency leakage current generated during the operation of variable-frequency household appliances can easily mistakenly trigger the ground fault circuit breaker in the user's home, affecting the user experience. Summary of the invention

[0004] The present application provides a household appliance and a frequency conversion control method to reduce the probability of a frequency conversion household appliance erroneously triggering a ground fault circuit breaker.

[0005] In a first aspect, some embodiments of the present application provide a household appliance, comprising a housing, a motor disposed in the housing, and a frequency conversion controller disposed in the housing;

[0006] The motor is configured to operate according to the pulses;

[0007] The variable frequency controller is configured as:

[0008] In the case of triggering the speed adjustment event of the motor, determining a switching frequency that matches the adjusted speed of the motor to obtain a target switching frequency, wherein when the frequency conversion controller outputs pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a set current threshold;

[0009] Outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, the pulses being used to drive the motor.

[0010] When the motor speed adjustment event is triggered and the motor speed needs to be adjusted, the target switching frequency that matches the adjusted speed is first determined based on the adjusted speed. Since the leakage current generated by the household appliance does not reach the set current threshold when the frequency converter outputs pulses based on the target switching frequency and the adjusted speed, the frequency converter actually outputs pulses to the motor based on the adjusted speed and the target switching frequency to drive the motor. When the motor speed is adjusted, it can ensure that the leakage current generated by the household appliance is within a controllable range, thereby effectively reducing the probability of falsely triggering the ground fault circuit breaker in the user's home, which is beneficial to improving user experience.

[0011] In a second aspect, some embodiments of the present application further provide a frequency conversion control method, which is applied to a frequency conversion controller in the household appliance provided in the first aspect, wherein the household appliance further includes a motor, and the method includes:

[0012] In the case of triggering the speed adjustment event of the motor, determining a switching frequency that matches the adjusted speed of the motor to obtain a target switching frequency, wherein when the frequency conversion controller outputs pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a set current threshold;

[0013] Outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, the pulses being used to drive the motor.

[0014] In a third aspect, an embodiment of the present application provides a frequency conversion control device, comprising a module for executing the frequency conversion control method in the second aspect.

[0015] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the frequency conversion control method described in the second aspect are implemented.

[0016] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a household appliance, the household appliance executes the frequency conversion control method described in the second aspect above.

[0017] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of an operation scenario between a display device and a control device provided in some embodiments of the present application;

[0020] Figure 2 A schematic diagram of the hardware configuration of a control device provided in some embodiments of the present application;

[0021] Figure 3 A structural block diagram of a household appliance provided in some embodiments of the present application;

[0022] Figure 4 A flow chart of a frequency conversion control method provided in some embodiments of the present application;

[0023] Figure 5 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0024] Figure 6 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0025] Figure 7 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0026] Figure 8 A timing interaction diagram of a frequency conversion control method provided in some embodiments of the present application;

[0027] Fig. 9 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0028] Fig.10 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0029] Fig.11 A flow chart of another frequency conversion control method provided in some embodiments of the present application;

[0030] Fig.12 A schematic structural diagram of a frequency conversion control device provided in some embodiments of the present application. DETAILED DESCRIPTION

[0031] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0032] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0033] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0034] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0035] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0036] Figure 1 Schematic diagram of operation scenarios between home appliances and control devices provided in some embodiments of the present application. Figure 1 As shown in FIG. 1 , the user can operate the home appliance 200 through touch operation, the mobile terminal 300 and the control device 100. For example, the control device 100 can be a remote controller, a stylus pen, a handle, etc.

[0037] In some embodiments, the control device 100 may be a remote controller or a smart home controller, etc. For example, the control device is a remote controller, and the communication method between the remote controller and the home appliance includes but is not limited to infrared protocol communication, Bluetooth protocol communication or other short-range communication methods, and the home appliance 200 is controlled wirelessly or wired. The user can input user commands through buttons on the remote controller, voice input, or control panel input to control the home appliance 200.

[0038] In the embodiment of the present application, the household appliance 200 generally refers to a household appliance that adopts frequency conversion technology, such as a frequency conversion air conditioner, a frequency conversion refrigerator or a water heater.

[0039] In some embodiments, a mobile terminal 300 (such as a tablet computer, a computer, or a mobile phone, etc.) may also be used to control the home appliance 200. For example, the home appliance 200 may be controlled using an application running on the mobile terminal 300.

[0040] In some embodiments, the home appliance may not use the mobile terminal 300 or the control device 100 to receive instructions, but may receive user control through buttons set on the home appliance. Figure 1 As shown in FIG. 4 , the home appliance 200 also communicates data with the server 400 through various communication methods. The home appliance 200 may be allowed to communicate and connect through a local area network (LAN), a wireless local area network (WLAN) and other networks.

[0041] Figure 2 Some embodiments of the present application provide Figure 1 The hardware configuration diagram of the control device in the figure. Figure 2 As shown, the control device 100 may include: a controller 110, a communication interface 130, a user input / output interface, a memory, and a power supply.

[0042] The control device 100 is configured to control the home appliance 200 , and can receive user input operation instructions, and convert the operation instructions into instructions that the home appliance 200 can recognize and respond to, thereby acting as an interactive intermediary between the user and the home appliance 200 .

[0043] In some embodiments, the control device 100 may be a smart device, for example, the control device 100 may be installed with various applications for controlling the home appliance 200 according to user needs.

[0044] In some embodiments, Figure 1 As shown, the mobile terminal 300 or other smart electronic devices can play a similar function as the control device 100 after installing the application for controlling the home appliance 200 .

[0045] The controller 110 includes a processor 112, a RAM 113, a ROM 114, a communication interface 130, and a communication bus. The controller 110 is used to control the operation and operation of the control device 100, as well as the communication and cooperation between the internal components and the external and internal data processing functions.

[0046] The communication interface 130 implements communication of control signals and data signals with the home appliance 200 under the control of the controller 110. The communication interface 130 may include at least one of other near field communication modules such as a WiFi chip 131, a Bluetooth module 132, and an NFC module 133.

[0047] The user input / output interface 140 , wherein the input interface includes at least one of other input interfaces such as a microphone 141 , a touch panel 142 , a sensor 143 , and a button 144 .

[0048] In some embodiments, the control device 100 includes at least one of a communication interface 130 and an input / output interface 140. The control device 100 is configured with a communication interface 130, such as a WiFi, Bluetooth, NFC or other module, and can encode the user input command through the WiFi protocol, Bluetooth protocol, or NFC protocol and send it to the home appliance 200.

[0049] The memory 190 is used to store various operating programs, data and applications for driving and controlling the control device 100 under the control of the controller. The memory 190 can store various control signal instructions input by the user.

[0050] The power supply 180 is used to provide operating power support for each component of the control device 100 under the control of the controller.

[0051] In order to facilitate further understanding of the technical solutions in some embodiments of the present application, the technical solutions of household appliances and frequency conversion control methods, as well as how the technical solutions solve the above-mentioned technical problems are described in detail below in combination with some specific embodiments and drawings. The various embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of them.

[0052] Figure 3 It shows that some embodiments of the present application provide Figure 1 For the sake of convenience, the structural block diagram of the household electrical appliance only shows the part related to the embodiment of the present application.

[0053] Reference Figure 3 The household appliance includes a housing 310, a motor 320 and a frequency conversion controller 330.

[0054] The motor 320 is disposed in the housing 310 and is configured to operate according to pulses.

[0055] The frequency conversion controller 330 is disposed in the shell 310 and is configured to: when a speed adjustment event of the motor 320 is triggered, determine the switching frequency that matches the adjusted speed of the motor 320 to obtain a target switching frequency, wherein when the frequency conversion controller 330 outputs pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a set current threshold; and output pulses to the motor 320 according to the adjusted speed and the target switching frequency, and the pulses are used to drive the motor 320.

[0056] Figure 4 A flow chart of a frequency conversion control method provided by some embodiments of the present application is shown. The above method is applied to the frequency conversion controller in the above household appliance, and is described in detail as follows:

[0057] S410. When a speed adjustment event of the motor is triggered, a switching frequency that matches the adjusted speed of the motor is determined to obtain a target switching frequency, wherein when the frequency conversion controller outputs pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a set current threshold.

[0058] The speed adjustment event of the motor refers to the event that the speed of the motor needs to be adjusted due to changes in certain internal or external conditions. The adjusted speed refers to the speed that the motor should reach corresponding to the speed adjustment event.

[0059] Switching frequency, also known as carrier frequency or power supply frequency, refers to the frequency of turning on and off a power switch device (such as an insulated gate bipolar transistor). The frequency converter can switch the current path by controlling the on and off of the power switch device, thereby forming an instantaneous electric shock (i.e., pulse) in the circuit. Among them, the pulse can be expressed as a pulse current or a pulse voltage. The frequency converter controls the power switch device to turn on and off quickly through a certain switching frequency, thereby forming a series of pulses with adjustable widths, which are arranged in time to form a pulse sequence.

[0060] Optionally, the triggering conditions of the motor speed regulation event include, but are not limited to, changes in operating parameters of household appliances, changes in environmental parameters, changes in load, and changes in voltage stability, and can be set specifically according to actual application scenarios.

[0061] For example, when the household appliance is a refrigerator, changes in operating parameters such as the temperature or fresh-keeping mode of the refrigerator and changes in environmental parameters such as the temperature or humidity of the environment in which the refrigerator is located can be set as trigger conditions for the motor speed adjustment event. Assume that the user adjusts the temperature of the refrigerator from A to B through a control device (such as a remote control), and the control device sends a temperature adjustment instruction to the frequency conversion controller of the refrigerator according to the user's settings, instructing the frequency conversion controller to adjust the temperature of the refrigerator to B. The frequency conversion controller can determine that the trigger condition is met based on the received temperature adjustment instruction: the operating parameters of the refrigerator change, at this time, the motor speed adjustment event is triggered. At this time, corresponding to the motor speed adjustment event, the frequency conversion controller can determine the speed that the motor needs to reach based on the temperature B that the refrigerator needs to reach in the temperature adjustment instruction, that is, determine the adjusted speed of the motor.

[0062] It should be understood that the set current threshold is the current threshold for the household appliance. The set current threshold can be a threshold calculated based on data such as a leakage current threshold of a common ground fault circuit breaker, or the current threshold can be determined based on a leakage current threshold input by a user, or the current threshold can be automatically calculated based on ground fault circuit breaker information (such as brand or model, etc.) input by the user.

[0063] In some embodiments, the set current threshold is a threshold determined according to a target current threshold, and the target current threshold may be a trigger current of a ground fault circuit breaker. When the ground fault circuit breaker detects that the leakage current reaches the trigger current, it triggers an action and cuts off the circuit. Further, the target current threshold may be a trigger current of a ground fault circuit breaker corresponding to the circuit to which the household appliance is connected (i.e., a ground fault circuit breaker in the user's home).

[0064] For example, considering that the ground fault circuit breakers used in different users' homes may be different, that is, the ground fault circuit breakers in different users' homes have different sensitivities to high-frequency leakage current, the user can input the leakage current threshold (i.e., the target current threshold) of the ground fault circuit breaker in the application running on the mobile terminal, and the application sends the target current threshold input by the user to the frequency conversion controller, so that the frequency conversion controller can set the current threshold of the household appliance in a targeted manner according to the target current threshold, thereby controlling the range of high-frequency leakage current that can be generated during the operation of the household appliance, and further reducing the probability of false triggering of the ground fault circuit breaker in the user's home. It should be understood that the set current threshold is less than the target current threshold.

[0065] Optionally, when determining the switching frequency that matches the adjusted speed of the motor, the switching frequency that matches the adjusted speed can be determined by actual operation or current matching to obtain the required target switching frequency. The embodiment of the present application does not impose any specific restrictions on the method of determining the target switching frequency.

[0066] As an example, since the high-frequency leakage current that can be generated by household appliances at various switching frequencies is usually known, we can first determine the switching frequency at which the high-frequency leakage current generated is less than the current threshold (assuming it is called the available switching frequency), and then determine from the available switching frequencies the switching frequency that can meet the requirement that when the refrigerator motor runs at an adjusted speed, the leakage current generated by the household appliance does not exceed the set current threshold, and use it as the target switching frequency.

[0067] As another example, the frequency conversion controller can perform a matching operation when the household appliance is powered on for the first time, and the matching operation includes: for each speed, outputting pulses corresponding to different switching frequencies to the motor in turn, so as to determine through actual operation the switching frequency at which the household appliance will not trigger the ground fault circuit breaker when the motor runs at this speed, thereby obtaining the switching frequency matching each speed, and establishing a mapping table of the switching frequency matching the speed. During the operation of the household appliance, when it is necessary to determine the switching frequency matching the adjusted speed, the switching frequency matching the adjusted speed can be directly queried from the mapping table to obtain the target switching frequency.

[0068] In an embodiment of the present application, when a motor speed adjustment event is triggered and the motor speed needs to be adjusted, the corresponding target switching frequency is first determined based on the speed that the motor should reach after the adjustment, that is, the adjusted speed, so that after the subsequent frequency conversion controller outputs pulses based on the target switching frequency and the adjusted speed, when the household appliance operates at the target switching frequency and the adjusted speed, the leakage current normally generated by the household appliance will not reach the set current threshold, thereby reducing the probability of false triggering of the ground fault circuit breaker during the frequency conversion control process.

[0069] S420, outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, wherein the pulses are used to drive the motor.

[0070] After determining the target switching frequency, the frequency conversion controller can output pulses to the motor according to the adjusted speed and the target switching frequency, so as to drive the motor to run through the pulses, so that the motor reaches the adjusted speed, realizes the adjustment of the motor speed, and thus realizes the frequency conversion control of the household appliance.

[0071] It should be understood that when the frequency converter outputs pulses to the motor according to the adjusted speed and target switching frequency, it can control the on and off of the power switching device through methods such as registers, programmed control or external potentiometers to generate corresponding pulses and output them to the motor. The embodiments of the present application do not impose specific restrictions on the specific implementation method of generating pulses.

[0072] In an embodiment of the present application, when a motor speed adjustment event is triggered and the motor speed needs to be adjusted, a target switching frequency that matches the adjusted speed is first determined. Since the leakage current generated by the household appliance does not reach the set current threshold when the frequency converter outputs pulses based on the adjusted speed and the target switching frequency that matches the adjusted speed, the frequency converter actually outputs pulses to the motor according to the adjusted speed and the target switching frequency to drive the motor to achieve motor speed adjustment. This ensures that the leakage current generated by the normal operation of the household appliance does not exceed the set current range, that is, the leakage current generated by the household appliance is controllable, thereby effectively reducing the probability of falsely triggering the ground fault circuit breaker, which is beneficial to improving user experience. At the same time, it can effectively reduce the number of on-site maintenance visits by after-sales service personnel for household appliances, thereby reducing unnecessary expenses for enterprises.

[0073] Figure 5 The flowchart of a frequency conversion control method for household appliances provided in some embodiments of the present application is shown. Figure 5 As shown, when the frequency conversion controller executes the output of pulses to the motor according to the adjusted speed and the target switching frequency, the frequency conversion controller is configured as follows:

[0074] S421, determining the average voltage required for the motor to reach the adjusted speed.

[0075] S422. Output pulses to the motor according to the average voltage and the target switching frequency.

[0076] The average voltage refers to the average value of the voltage values ​​corresponding to the high level time and the low level time in a pulse cycle. The average voltage of the pulse is affected by the duty cycle and voltage amplitude of the pulse (i.e. the voltage value of the high level). The duty cycle refers to the ratio of the high level time (also known as the pulse duration) to the entire pulse cycle. Among them, a pulse cycle usually refers to the time interval from the starting point of the pulse to the starting point of the next pulse.

[0077] In order to improve the regulation effect of the motor speed, after determining the target switching frequency, the average voltage required for the motor to reach the regulated speed under the target switching frequency can be calculated first, and then pulses can be output to the motor directly according to the average voltage and the target switching frequency. This can more accurately control the motor speed and adjust the motor speed at a faster rate to reach the regulated speed, thereby improving the efficiency and accuracy of the frequency conversion control.

[0078] It should be understood that when the frequency converter determines the average voltage required for the motor to reach the adjusted speed based on the target switching frequency, it can combine the characteristics of the motor in the household appliance (such as the voltage-speed relationship of the motor) and the adjusted speed to calculate the required average voltage.

[0079] It should be understood that when pulses are output to the motor according to the target switching frequency and average voltage (assuming it is called the target average voltage), the actual average voltage of the actual output pulses can be made to reach the target average voltage by adjusting the duty cycle and / or voltage amplitude of the pulses, thereby enabling the motor speed to be adjusted quickly and accurately.

[0080] Figure 6 The flowchart of a frequency conversion control method for household appliances provided in some embodiments of the present application is shown. Figure 6 , the frequency converter is configured to perform the following steps:

[0081] S610. When the household appliance is switched from a power-off state to a power-on state, an adaptive operation is performed based on any switching frequency. The adaptive operation includes: based on the selected switching frequency, pulses corresponding to the various rotation speeds of the motor are output to the motor in sequence.

[0082] S620: When the adaptive operation is completed, the selected switching frequency is recorded as an uninterrupted switching frequency.

[0083] S630: When the speed adjustment event of the motor is triggered, if the uninterrupted switching frequency exists, determine the uninterrupted switching frequency as the target switching frequency.

[0084] S640: Output pulses to the motor according to the adjusted rotation speed and the target switching frequency.

[0085] An interruption refers to a situation in which a normal program is suspended or terminated due to a power outage or other factors during the execution of a program. In the embodiment of the present application, an interruption may include a situation in which the normal execution of an adaptive operation is forced to be terminated due to a power outage of a household appliance during the adaptive operation of the frequency conversion controller, and the adaptive operation is not completed at this time.

[0086] It should be understood that during the process of the frequency conversion controller performing the adaptive operation, the power failure of the household appliance may be caused by the high-frequency leakage current generated by the household appliance reaching the set current threshold, or may be caused by the ground fault circuit breaker being triggered. Among them, when the household appliance is powered off due to the ground fault circuit breaker being triggered and the adaptive operation is interrupted, it can also be considered that the leakage current generated by the household appliance has reached the current threshold.

[0087] It should be noted that, in some embodiments, the power failure of the home appliance also includes a power failure caused by a power outage or other circumstances that result in the home appliance having no power supply. That is, when the above circumstances cause the home appliance to be powered off, resulting in the interruption of the adaptive operation, it can be determined that the leakage current generated by the home appliance reaches the current threshold.

[0088] In order to improve the frequency conversion control effect of household appliances, when the household appliances are switched from the power-off state to the power-on state, an adaptive operation is first performed based on any switching frequency, that is, it is equivalent to using the selected switching frequency as the switching frequency matching each rotational speed, and outputting corresponding pulses to the motor to drive the motor to actually operate, and judging whether the leakage current generated by the household appliances reaches the set current threshold when the frequency conversion controller outputs pulses at the selected switching frequency and rotational speed.

[0089] If the frequency converter successfully completes the adaptive operation according to the predetermined process and the adaptive operation enters the end state, it can be considered that the adaptive operation is completed. At this time, the selected switching frequency can be recorded as the uninterrupted switching frequency, which is the switching frequency that matches all speeds.

[0090] refer to Figure 6 , since after the household appliance switches from the power-off state to the power-on state, it usually needs to operate according to the set operating parameters of the household appliance (assuming the default device operating parameters), at this time it is necessary to drive the motor to operate at a corresponding speed (assuming it is called the default motor speed). Therefore, after performing the adaptive operation and determining the uninterrupted switching frequency, the frequency conversion controller can directly output pulses based on the uninterrupted switching frequency and the default motor speed, thereby driving the motor to operate at the default motor speed, that is, making the household appliance operate with the default device operating parameters.

[0091] During the operation of the household appliance, when a speed adjustment event of the motor is triggered, the frequency conversion controller can detect whether there is an uninterrupted switching frequency. If there is an uninterrupted switching frequency, it is directly determined as the target switching frequency.

[0092] It should be understood that the uninterrupted switching frequency determined in the embodiment of the present application is a switching frequency that matches all speeds. Therefore, after the frequency conversion controller completes the adaptive operation, when any number of motor speed adjustment events are triggered, the target switching frequency adopted by the frequency conversion controller can be the uninterrupted switching frequency until the household appliance switches from the power-on state to the power-off state.

[0093] It should be noted that each time the household appliance switches from a power-off state to a power-on state, the adaptive operation can be performed to re-determine the uninterrupted switching frequency.

[0094] In an embodiment of the present application, when the home appliance switches from a power-off state to a power-on state, a switching frequency matching each rotational speed is found through an adaptive operation, and the switching frequency is recorded as an uninterrupted switching frequency. Subsequently, when the speed adjustment event of the motor is triggered during the operation of the home appliance, the uninterrupted switching frequency can be directly determined as the target switching frequency. There is no need to determine the target switching frequency based on the adjusted rotational speed, and there is no need to adjust the switching frequency during the operation of the home appliance. This can effectively reduce the amount of calculation and improve the frequency conversion control effect while reducing the false triggering of the ground fault circuit breaker.

[0095] Figure 7 The flowchart of a frequency conversion control method for household appliances provided in some embodiments of the present application is shown. Figure 7 , the variable frequency controller is configured to perform the following steps when performing adaptive operation based on any switching frequency:

[0096] In the case where there is an execution interruption record, the adaptive operation is performed based on any switching frequency other than the switching frequency corresponding to the execution interruption record, and the execution interruption record is used to indicate the switching frequency corresponding to the interrupted adaptive operation.

[0097] In the embodiment of the present application, when the frequency conversion controller performs an adaptive operation based on the selected switching frequency, if the leakage current generated by the household appliance reaches the current threshold, the household appliance will be powered off, thereby interrupting the adaptive operation. The frequency conversion controller can record the switching frequency corresponding to the interrupted adaptive operation in the interruption record. It should be understood that the switching frequency corresponding to the interrupted adaptive operation is a switching frequency that does not match a certain rotation speed of the motor.

[0098] When the frequency converter controller performs an adaptive operation, it can first detect whether there is an execution interruption record. If there is an execution interruption record, any switching frequency other than the switching frequency corresponding to the execution interruption record can be used as the selected switching frequency, and the adaptive operation is performed based on the selected switching frequency, that is, avoiding the use of a switching frequency that does not match a motor speed to perform an adaptive operation, reducing the probability of the adaptive operation being interrupted, and helping to improve the execution effect of the adaptive operation.

[0099] Figure 8 The following is a timing interaction diagram of a frequency conversion control method for household appliances provided in some embodiments of the present application. Figure 8 As shown, the above frequency conversion controller is also configured as:

[0100] When the input operation parameters of the household appliance are obtained, the adjusted rotation speed is determined according to the operation parameters of the household appliance, and the rotation speed adjustment event is triggered.

[0101] The operating parameters of household appliances refer to the working parameters of household appliances, which refer to the indicators that need to be maintained during the operation of household appliances. It should be understood that the operating parameters of different household appliances may include different parameters. For example, the operating parameters of a refrigerator may include parameters such as the operating temperature of the refrigerator compartment and the operating temperature of the freezer compartment, and the operating parameters of an air conditioner may include parameters such as the cooling / heating temperature, the circulating air volume, and the dehumidification amount.

[0102] It should be understood that Figure 8 Taking the example of a user inputting the operating parameters of a household appliance through a control device, in actual applications, the input operating parameters of the household appliance may also be the operating parameters input by the user through a mobile terminal and sent to the frequency conversion controller by the mobile terminal, or may be the operating parameters input into the frequency conversion controller by the user through control buttons or voice input set on the household appliance, or may be the operating parameters calculated by an intelligent computing module in the household appliance or other devices such as an intelligent robot through an intelligent algorithm and input into the frequency conversion controller. The specific settings may be made according to the actual application scenario.

[0103] In the embodiment of the present application, since the rotation speed of the motor in the household appliance usually directly affects the operating parameters of the household appliance, when the operating parameters of the household appliance need to be adjusted, the adjustment of the operating parameters of the household appliance can be achieved by adjusting the rotation speed of the motor, that is, the adjustment of the operating parameters of the household appliance is converted into the adjustment of the motor speed. When the input operating parameters of the household appliance are obtained, after the adjusted rotation speed of the motor is determined according to the input operating parameters of the household appliance, the motor speed adjustment event is triggered so that control is performed based on the adjusted rotation speed to achieve the adjustment of the operating parameters of the household appliance.

[0104] Fig. 9 FIG. 1 is a flow chart showing a frequency conversion control method for household appliances provided in some embodiments of the present application. Fig. 9 As shown, the above frequency conversion controller is also configured as:

[0105] When the actual status data of the household appliance does not reach the expected status data, the adjusted speed is determined based on the deviation between the actual status data and the expected status data, and the speed adjustment event is triggered. The status data reflects the actual operating status of the household appliance.

[0106] The status data of the home appliance refers to data reflecting the operating status of the home appliance. In the embodiment of the present application, the status data of the home appliance may include data corresponding to various status parameters of the home appliance. It should be understood that the status data of different home appliances may include data corresponding to different status parameters.

[0107] For example, when the household appliance is a refrigerator, its state parameters may include refrigerator compartment temperature, refrigerator compartment load (the load refers to the amount of food stored), freezer compartment temperature, freezer compartment load, refrigerator door open / close state, and refrigerator door open / close duration, and its state data includes data corresponding to these state parameters. For another example, when the household appliance is an air conditioner, its state parameters may include room temperature and air humidity.

[0108] The expected state data reflects the operating state that the household appliance should reach. Optionally, the expected state data may be data determined according to operating parameters of the household appliance.

[0109] It should be understood that the frequency conversion controller can obtain data corresponding to various status parameters of the household appliance through corresponding sensors such as temperature sensors or other methods to obtain actual status data of the household appliance.

[0110] Considering that environmental factors may affect the operation of household appliances and make their actual operating status inconsistent with the expected operating status, and the status data of household appliances can better reflect the actual operating status of household appliances, the frequency conversion controller can determine whether the household appliances have reached the expected operating status by obtaining the actual status data and judging whether the actual status data is consistent with the expected status data.

[0111] If it is determined that the actual state data does not meet the expected state data, the adjusted speed can be determined according to the deviation between the actual state data and the expected state data, and the speed adjustment event of the motor can be triggered, so that the state data of the home appliance reaches the expected state data by adjusting the speed of the motor. Through the above processing, the home appliance is guaranteed to run stably in the expected operating state, which is conducive to improving the user experience.

[0112] If it is determined that the actual state data is consistent with the expected state data, it indicates that the household appliance is operating in the expected operating state. At this time, there is no need to adjust the speed of the motor.

[0113] In some embodiments, when the status data of the household appliance includes data of multiple status parameters, it can be determined that the actual status data of the household appliance does not reach the expected status data if the data of at least one status parameter does not reach the corresponding expected status data.

[0114] For example, suppose the household appliance is a refrigerator, and the state parameters include the temperature of the refrigerator compartment and the temperature of the freezer compartment. Assume that the expected state data includes: the expected temperature of the refrigerator compartment is 20°C, and the expected temperature of the freezer compartment is -18°C, and assume that the actual state data acquired by the frequency conversion controller includes: the actual temperature of the refrigerator compartment is 23°C, and the actual temperature of the freezer compartment is -18°C. Among them, the actual temperature of the refrigerator compartment does not reach its expected temperature, and the actual temperature of the freezer compartment reaches its expected temperature. At this time, it can be determined that the actual state data of the refrigerator does not reach the expected state data.

[0115] Fig.10 FIG. 1 is a flow chart showing a frequency conversion control method for household appliances provided in some embodiments of the present application. Fig.10 As shown, after the frequency conversion controller executes the output of pulses to the motor according to the adjusted speed and the target switching frequency, the frequency conversion controller is further configured as follows:

[0116] When the real-time rotation speed of the motor does not reach the adjusted rotation speed, pulses are output to the motor according to a deviation between the real-time rotation speed and the adjusted rotation speed and the target switching frequency.

[0117] Taking into account the influence of factors such as environment, noise and interference, when the motor rotates according to the pulses output by the frequency converter, there may be a deviation between the actual speed achieved and the required adjusted speed. Therefore, in order to ensure the frequency conversion control effect of the motor, the frequency converter can obtain the real-time speed of the motor after outputting pulses to the motor according to the adjusted speed and target switching frequency.

[0118] It should be understood that after the frequency converter controller outputs pulses to the motor according to the adjusted speed and target switching frequency, it can determine the timing of obtaining the real-time speed of the motor according to the duration of the output pulse, or it can determine the timing of obtaining the real-time speed of the motor according to a preset duration (such as 20 seconds). The timing of the frequency converter controller obtaining the real-time speed of the motor can be set according to the actual application scenario, and no specific restrictions are made here.

[0119] It should be understood that when the frequency converter obtains the real-time speed of the motor, it can measure the real-time speed of the motor through measuring equipment such as an encoder, or it can estimate the real-time speed of the motor through algorithms such as neural networks or synovial observers. The embodiments of the present application do not impose specific restrictions on this.

[0120] For example, the household appliance may include a sampling module, which is used to sample the current and voltage of the motor to obtain the real-time current and voltage of the motor. When the frequency conversion controller needs to obtain the real-time speed of the motor, it can obtain the real-time current and voltage of the motor from the sampling module, and input the obtained real-time current and voltage into the motor simulation model, and estimate the real-time speed of the motor according to the real-time current and voltage of the motor through the motor simulation model.

[0121] It should be understood that if it is determined that the real-time speed of the motor does not reach the adjusted speed, it can be considered that the motor is interfered with by the environment or other factors, resulting in its inability to reach the corresponding speed (here is the adjusted speed) when running according to the pulse. At this time, it is necessary to redetermine the pulse based on the deviation between the real-time speed of the motor and the adjusted speed and the target switching frequency, and output a new pulse to the motor.

[0122] If it is determined that the real-time speed of the motor has reached the adjusted speed, the frequency conversion controller can continue to output the current pulse to the motor, so that the motor can run stably at the adjusted speed, thereby controlling the stable operation of the home appliance.

[0123] In some embodiments, after the frequency conversion controller outputs a new pulse to the motor based on the deviation between the real-time speed of the motor and the adjusted speed and the target switching frequency, it can also continue to obtain the real-time speed of the motor for judgment. For example, during the operation of the home appliance, the frequency conversion controller can obtain the real-time speed of the motor at a preset frequency (such as once every 60 seconds) and determine the pulse that the frequency conversion controller needs to output based on the latest real-time speed. Fig.11 When the latest real-time speed of the motor reaches the adjusted speed (that is, the expected speed), the frequency converter outputs the original pulse (that is, the pulse output last time) to the motor without re-determining the pulse. When the latest real-time speed of the motor does not reach the adjusted speed, the frequency converter can determine a new pulse based on the deviation between the real-time speed and the adjusted speed and the target switching frequency, and then output a new pulse to the motor.

[0124] Corresponding to the frequency conversion control method described in the above embodiment, Fig.12 A structural block diagram of a frequency conversion control device provided in an embodiment of the present application is shown. For ease of explanation, only the parts related to the embodiment of the present application are shown.

[0125] Reference Fig.12 The device includes: a target switching frequency determination module 1210 and a control module 1220. Among them,

[0126] a target switching frequency determination module 1210, configured to determine a switching frequency matching the adjusted speed of the motor to obtain a target switching frequency when a speed adjustment event of the motor is triggered, wherein when a pulse is output based on the adjusted speed and the target switching frequency, a leakage current generated by the household appliance does not reach a current threshold;

[0127] The control module 1220 is used to output pulses to the motor according to the adjusted rotation speed and the target switching frequency, wherein the pulses are used to drive the motor.

[0128] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0129] The embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a controller, the steps in the above-mentioned method embodiments can be implemented.

[0130] An embodiment of the present application provides a computer program product. When the computer program product runs on a controller, the controller can implement the steps of the frequency conversion control method described in the above embodiments when the computer program product is executed.

[0131] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the camera / electronic device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0132] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0134] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A household appliance, characterized in that: include: case; A motor disposed in the housing and configured to operate according to the pulses; The frequency conversion controller disposed in the housing is configured as follows: In the case of triggering the speed adjustment event of the motor, determining a switching frequency that matches the adjusted speed of the motor to obtain a target switching frequency, wherein when the frequency conversion controller outputs pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a set current threshold; Outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, the pulses being used to drive the motor.

2. The household appliance according to claim 1, characterized in that: The frequency conversion controller is also configured as: When the household appliance is switched from a power-off state to a power-on state, an adaptive operation is performed based on any switching frequency, the adaptive operation comprising: sequentially outputting pulses corresponding to various rotation speeds of the motor to the motor based on the selected switching frequency; When the adaptive operation is completed, recording the selected switching frequency as an uninterrupted switching frequency; When the frequency conversion controller determines a switching frequency that matches the adjusted rotational speed of the motor and obtains a target switching frequency, the frequency conversion controller is configured as follows: In the case that the uninterrupted switching frequency exists, the uninterrupted switching frequency is determined as the target switching frequency.

3. The household appliance according to claim 2, characterized in that: When the frequency conversion controller performs the adaptive operation based on any switching frequency, the frequency conversion controller is configured as follows: In the case where there is an execution interruption record, the adaptive operation is performed based on any switching frequency other than the switching frequency corresponding to the execution interruption record, wherein the execution interruption record is used to indicate the switching frequency corresponding to the interrupted adaptive operation.

4. The household appliance according to claim 1, characterized in that: The frequency conversion controller is also configured as: When the input operating parameters of the household appliance are acquired, the adjusted rotation speed is determined according to the operating parameters of the household appliance, and the rotation speed adjustment event is triggered.

5. The household appliance according to claim 1, characterized in that: The frequency conversion controller is also configured as: When the actual status data of the household appliance does not reach the expected status data, the adjusted speed is determined according to the deviation between the actual status data and the expected status data, and the speed adjustment event is triggered, and the actual status data reflects the actual operating status of the household appliance.

6. The household appliance according to claim 1, characterized in that: When the frequency conversion controller executes the step of outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, the frequency conversion controller is configured as follows: determining an average voltage required for the motor to achieve the adjusted speed; Pulses are output to the motor according to the average voltage and the target switching frequency.

7. The household appliance according to any one of claims 1 to 6, characterized in that: After the frequency conversion controller outputs pulses to the motor according to the adjusted rotation speed and the target switching frequency, the frequency conversion controller is further configured as follows: When the real-time rotation speed of the motor does not reach the adjusted rotation speed, pulses are output to the motor according to a deviation between the real-time rotation speed and the adjusted rotation speed and the target switching frequency.

8. A frequency conversion control method, characterized in that: A frequency conversion controller applied to a household appliance, wherein the household appliance further comprises a motor, and the method comprises: In the case of triggering the speed adjustment event of the motor, determining a switching frequency that matches the adjusted speed of the motor to obtain a target switching frequency, wherein when outputting pulses based on the adjusted speed and the target switching frequency, the leakage current generated by the household appliance does not reach a current threshold; Outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency, the pulses being used to drive the motor.

9. The frequency conversion control method according to claim 8, characterized in that: Also includes: When the household appliance is switched from a power-off state to a power-on state, an adaptive operation is performed based on any switching frequency, the adaptive operation comprising: sequentially outputting pulses corresponding to various rotation speeds of the motor to the motor based on the selected switching frequency; When the adaptive operation is completed, recording the selected switching frequency as an uninterrupted switching frequency; The step of determining a switching frequency that matches the adjusted rotational speed of the motor to obtain a target switching frequency includes: In the case that the uninterrupted switching frequency exists, the uninterrupted switching frequency is determined as the target switching frequency.

10. The frequency conversion control method according to claim 8 or 9, characterized in that: The step of outputting pulses to the motor according to the adjusted rotation speed and the target switching frequency comprises: determining an average voltage required for the motor to achieve the adjusted speed; Pulses are output to the motor according to the average voltage and the target switching frequency.

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