Control method and device of electrical equipment and electrical equipment

Abstract

The invention relates to a control method and device of electrical equipment and the electrical equipment. The electrical equipment is equipped with a power factor correction (PFC) circuit, and the method comprises the following steps: obtaining a period average duty ratio of a power switch device in the PFC circuit in a current power frequency period; acquiring state parameters of the PFC circuit in the current power frequency period; determining the current maximum cycle average duty ratio of the power switch device according to the state parameters; and controlling the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio. According to the scheme, the electrical equipment can be controlled through the cycle average duty ratio and the current maximum cycle average duty ratio under the condition that no extra temperature sensor is needed, so that the situation that the temperature rise of the power switch device is too high is avoided, the implementation cost can be reduced, and the power switch device can be prevented from being burnt down.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical equipment, and particularly to a control method, device and electrical equipment for electrical equipment. Background Art

[0002] The main purpose of the PFC (Power Factor Correction) circuit is to improve the THD (Total Harmonic Distortion) and power factor indicators of electrical equipment. Currently, the active PFC circuit has been widely used due to its advantages such as high power factor, small harmonic current, and stable output voltage.

[0003] Generally, the temperature rise of the power switching device in the PFC circuit is greatly affected by environmental temperature, heat dissipation conditions, load output power, input voltage, etc. If not controlled in time, the power switching device will be burned out when the temperature rise is too high, thus affecting the normal operation of the electrical equipment. Therefore, how to control the electrical equipment to avoid the over-high temperature rise of the power switching device has become an urgent problem to be solved at present. Summary of the Invention

[0004] To solve the above problems, the present disclosure provides a control method, device and electrical equipment for electrical equipment.

[0005] According to the first aspect of the embodiments of the present disclosure, a control method for an electrical equipment is provided. The electrical equipment is equipped with a power factor correction PFC circuit, including:

[0006] Obtaining the cycle average duty ratio of the power switching device in the PFC circuit in the current power frequency cycle;

[0007] Obtaining the state parameter of the PFC circuit in the current power frequency cycle;

[0008] Determining the current maximum cycle average duty ratio of the power switching device according to the state parameter;

[0009] Controlling the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio.

[0010] According to the second aspect of the embodiments of the present disclosure, a control device for an electrical equipment is provided. The electrical equipment is equipped with a power factor correction PFC circuit, including:

[0011] A first acquisition module, configured to obtain the cycle average duty ratio of the power switching device in the PFC circuit in the current power frequency cycle;

[0012] A second acquisition module, configured to obtain the state parameter of the PFC circuit in the current power frequency cycle;

[0013] A determination module, configured to determine a current maximum cycle average duty ratio of the power switching device according to the state parameter;

[0014] A control module, configured to control the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio.

[0015] According to a third aspect of the embodiments of the present disclosure, there is provided an electrical equipment equipped with a power factor correction (PFC) circuit, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method described in the first aspect above is implemented.

[0016] According to a fourth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method described in the first aspect above is implemented.

[0017] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: By obtaining the cycle average duty ratio of the power switching device in the current power frequency cycle of the PFC circuit, and obtaining the state parameter of the PFC circuit in the current power frequency cycle, determining the current maximum cycle average duty ratio of the power switching device according to the state parameter, and controlling the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio. Without the need for an additional temperature sensor, this solution can control the electrical equipment through the cycle average duty ratio and the current maximum cycle average duty ratio to avoid the situation of excessive temperature rise of the power switching device, which can not only reduce the implementation cost but also avoid the burning of the power switching device.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0020] Figure 1 is a flowchart of a control method for an electrical equipment shown according to an exemplary embodiment;

[0021] Figure 2 is a structural diagram of a PFC circuit shown according to an exemplary embodiment;

[0022] Figure 3 is a flowchart of another control method for an electrical equipment shown according to an exemplary embodiment;

[0023] Figure 4 It is a corresponding relationship diagram between ambient temperature and the first maximum cycle average duty ratio shown according to an exemplary embodiment;

[0024] Figure 5 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0025] Figure 6 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0026] Figure 7 It is a corresponding relationship diagram between input voltage and the second maximum cycle average duty ratio shown according to an exemplary embodiment;

[0027] Figure 8 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0028] Figure 9 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0029] Figure 10 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0030] Figure 11 It is a flowchart of another control method for an electrical device shown according to an exemplary embodiment;

[0031] Figure 12 It is a structural block diagram of a control device for an electrical device shown according to an exemplary embodiment;

[0032] Figure 13 It is a structural block diagram of an electrical device shown according to an exemplary embodiment. Detailed implementation manners

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the 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 implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0034] It should be noted that the main purpose of the PFC (Power Factor Correction) circuit is to improve the THD (Total Harmonic Distortion) and power factor indicators of electrical equipment. Currently, the active PFC circuit has been widely used due to its advantages such as high power factor, small harmonic current, and stable output voltage.

[0035] Generally, the temperature rise of the power switch device in the PFC circuit is greatly affected by environmental temperature, heat dissipation conditions, load output power, input voltage, etc. If timely control is not carried out, the power switch device will be burned out when the temperature rise is too high, thus affecting the normal operation of the electrical equipment. Therefore, how to control the electrical equipment to avoid the too high temperature rise of the power switch device has become an urgent problem to be solved at present.

[0036] In the related art, in order to prevent the temperature rise of the power switch device from being too high, it is usually necessary to add a temperature sensor to detect the temperature of the power switch device. Among them, there are generally two ways to add a temperature sensor. One is to be built inside the switch tube package. This method has a high cost and requires adding a peak pin to the power switch device. The other is an external temperature sensor. This method requires digging a hole in the radiator and burying it in the radiator, with complex technology and high cost.

[0037] To solve the above problems, the present disclosure provides a control method, device and electrical equipment for an electrical equipment.

[0038] Figure 1 It is a flowchart of a control method for an electrical equipment shown according to an exemplary embodiment. Among them, the electrical equipment is equipped with a PFC circuit. The PFC circuit in the present disclosure implementation refers to an active PFC circuit. It should be noted that the control method for the electrical equipment in the present disclosure implementation can be applied to the control device for the electrical equipment in the present disclosure implementation, and this device can be equipped in the electrical equipment. Among them, the electrical equipment can be equipment such as an air conditioner, a refrigerator, a power supply equipment, etc. equipped with a PFC circuit. As Figure 1 shown, the method includes the following steps:

[0039] Step 101, obtain the cycle average duty ratio of the power switch device in the PFC circuit in the current power frequency cycle.

[0040] As Figure 2As shown, the PFC circuit consists of an inductor L, a power switch device Q, a diode D, and a capacitor C. A controller in the electrical device, such as a microcontroller MCU, outputs a pulse width modulation (PWM) signal to control the turning on and off of the power switch device Q. Among them, the power switch device can be a switching transistor. For example, it can be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT).

[0041] In some embodiments of the present disclosure, the cycle average duty ratio of the power switch device in the current power frequency cycle refers to the average value of the pulse width modulation (PWM) duty ratio of the power switch device within the current power frequency cycle. As an example, if the power frequency of the power supply is 50 Hz and the PFC carrier frequency is 40 kHz, there are 800 PWM duty ratio outputs within one power frequency cycle, and the cycle average duty ratio of the current power frequency cycle is the average value of the 800 duty ratios within the current power frequency cycle.

[0042] As a possible implementation, the PWM duty ratio output from the control module of the electrical device to the power switch device in the current power frequency cycle can be obtained; the average value of all the duty ratios within the current power frequency cycle is calculated to obtain the cycle average duty ratio of the current power frequency cycle.

[0043] Step 102: Obtain the state parameters of the PFC circuit in the current power frequency cycle.

[0044] Since the temperature rise of the power switch device in the PFC circuit is affected by the ambient temperature, heat dissipation, load output power, and input voltage, in order to avoid excessive temperature rise of the power switch device, the obtained state parameters can be at least one of the ambient temperature, heat dissipation, load output power, and input voltage.

[0045] As a possible implementation, obtaining the state parameters of the PFC circuit in the current power frequency cycle can include the current ambient temperature and / or the current input voltage. Among them, the current ambient temperature refers to the ambient temperature of the PFC circuit in the current power frequency cycle, and the current input voltage refers to the input voltage of the PFC circuit in the current power frequency cycle, that is Figure 2 the V in IN .

[0046] Step 103: Determine the current maximum cycle average duty ratio of the power switch device according to the state parameters.

[0047] It can be understood that as Figure 2As shown in the figure, when the power switch device Q is turned on, the input voltage charges the inductor L. When the power switch device Q is turned off, the input voltage is superimposed on the voltage across the inductor L, and the load is powered through the diode D. Therefore, the larger the duty cycle output by the controller of the electrical equipment to the power switch device, that is, the longer the conduction time of the power switch device, the greater the loss and the higher the temperature rise of the power switch device. That is to say, the temperature rise of the power switch device is related to the duty cycle. For the convenience of analysis, it can be calculated through the cycle-averaged duty cycle.

[0048] Among them, the current maximum cycle-averaged duty cycle refers to the maximum value of the cycle-averaged duty cycle of the power switch device that is allowed within the current power frequency cycle under the operating state corresponding to the state parameters of the current power frequency cycle in order to avoid excessive temperature rise of the power switch device.

[0049] As an implementation method, a large number of tests can be carried out to determine the training samples. Among them, the training samples include multiple groups of state parameters and the maximum cycle-averaged duty cycle of the power switch device allowed for each group of state parameters. The training samples are input into the neural network model for training to obtain a trained cycle-averaged duty cycle prediction model. The state parameters of the current power cycle are input into the cycle-averaged duty cycle prediction model to obtain the current maximum cycle-averaged duty cycle of the power switch device. Among them, the state parameters in the training samples are the same as the state parameters obtained in step 102. For example, if each group of state parameters in the training samples includes the ambient temperature and the input voltage, the state parameters obtained in step 102 also include the current ambient temperature and the current input voltage.

[0050] As another implementation method, through testing, a corresponding relationship can be established in advance between the magnitude of each state parameter related to the temperature rise of the power switch device and the maximum cycle-averaged duty cycle of the power switch device allowed. Based on the pre-established corresponding relationship, according to the state parameters of the current power frequency cycle, the maximum cycle-averaged duty cycle corresponding to each state parameter is obtained. According to the maximum cycle-averaged duty cycle corresponding to each state parameter, the current maximum cycle-averaged duty cycle is determined.

[0051] Step 104, control the electrical equipment according to the cycle-averaged duty cycle and the current maximum cycle-averaged duty cycle.

[0052] In some embodiments of the present disclosure, the cycle-averaged duty cycle of the current power frequency cycle can be compared with the current maximum cycle-averaged duty cycle. If the cycle-averaged duty cycle is greater than the current maximum cycle-averaged duty cycle, it indicates that the temperature rise of the current power switch device is too high, and the electrical equipment needs to be controlled to reduce the cycle-averaged duty cycle of the power switch device, thereby reducing the temperature rise of the power switch device to avoid damage to the power switch device.

[0053] As an implementation, when the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the electrical equipment can be controlled by reducing the PFC output power strategy. As an example, if the electrical equipment is an air conditioner, the frequency of the subsequent-stage compressor can be reduced at a preset rate, such as adjusting at a rate of reducing the compressor frequency by 1 Hz every 5 s, to reduce the output power, thereby reducing the cycle average duty ratio of the power switching device and avoiding damage to the power switching device due to excessive temperature rise.

[0054] As another example, in the process of reducing the frequency of the subsequent-stage compressor at a preset rate, the frequency of the subsequent-stage compressor can also be reduced according to the duty ratio difference between the current cycle average duty ratio and the current maximum cycle average duty ratio to achieve a reduction in output power. For example, a mapping relationship between the duty ratio difference and the frequency reduction rate can be established in advance, and based on this mapping relationship, the frequency reduction rate corresponding to the current duty ratio difference can be determined, and the frequency of the subsequent-stage compressor can be adjusted according to the corresponding frequency reduction rate.

[0055] According to the control method of the electrical equipment in the embodiments of the present disclosure, by obtaining the cycle average duty ratio of the power switching device in the current power frequency cycle of the PFC circuit and obtaining the state parameters of the PFC circuit in the current power frequency cycle, the current maximum cycle average duty ratio of the power switching device is determined according to the state parameters, and the electrical equipment is controlled according to the cycle average duty ratio and the current maximum cycle average duty ratio. In this solution, without the need for an additional temperature sensor, the electrical equipment can be controlled by the cycle average duty ratio and the current maximum cycle average duty ratio to avoid the situation of excessive temperature rise of the power switching device, which can not only reduce the implementation cost but also avoid the burning of the power switching device.

[0056] It can be understood that the usage scenarios of some electrical equipment are outdoors and the environmental temperature changes greatly, so the environmental temperature has a greater impact on the power switching device. In this case, the current maximum cycle average duty ratio can be determined based on the current environmental temperature of the PFC circuit in the current power frequency cycle to control the electrical equipment.

[0057] Next, the situation where the state parameters include the current environmental temperature will be introduced.

[0058] Figure 3 is a flowchart of another control method of an electrical equipment shown according to an exemplary embodiment. Among them, the state parameters of the current power frequency cycle include the current environmental temperature. Among them, the current environmental temperature can be obtained through the temperature sensor equipped on the electrical equipment. As Figure 3 shown, based on the above embodiment, Figure 1 step 103 in

[0059] Step 301: Based on the correspondence between the preset ambient temperature and the first maximum cycle average duty ratio, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature.

[0060] Since the higher the ambient temperature, the higher the temperature rise of the power switch device when the PFC circuit maintains the same output, a series of tests can be conducted to determine the correspondence between the ambient temperature and the first maximum cycle average duty ratio. Among them, the first maximum cycle average duty ratio refers to the maximum cycle average duty ratio that is allowed to be output to the power switch device based on temperature changes.

[0061] As an example, the ambient temperature can be continuously increased, and when other conditions are rated, the first maximum cycle average duty ratio corresponding to the power switch device when reaching the upper limit temperature rise at each ambient temperature can be tested, and the correspondence between the ambient temperature and the first maximum cycle average duty ratio as shown in Figure 4 is obtained.

[0062] Step 302: Determine the first maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0063] According to the control method of the electrical equipment according to the embodiments of the present disclosure, the first maximum cycle average duty ratio corresponding to the current ambient temperature can be determined based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio, and the first maximum cycle average duty ratio is determined as the current maximum cycle average duty ratio, and then the electrical equipment is controlled according to the cycle average duty ratio and the current maximum cycle average duty ratio. That is, for scenarios where the ambient temperature has a greater impact on the temperature rise of the power switch device, without an additional temperature sensor, the current maximum cycle average duty ratio can be determined through the pre-established relationship between the ambient temperature and the maximum cycle average duty ratio to achieve the control of the electrical equipment, thereby avoiding excessive temperature rise of the power switch device.

[0064] Figure 5 is a flowchart of another control method of an electrical equipment shown according to an exemplary embodiment. As shown in Figure 5 The method may include the following steps:

[0065] Step 501: Obtain the cycle average duty ratio of the power switch device in the PFC circuit in the current power frequency cycle.

[0066] Step 502: Obtain the state parameters of the PFC circuit in the current power frequency cycle; where the state parameters include the current ambient temperature.

[0067] Step 503: Based on the correspondence between the preset ambient temperature and the first maximum cycle average duty ratio, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature.

[0068] Step 504: Determine the first maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0069] Step 505: Compare the cycle average duty ratio with the current maximum cycle average duty ratio.

[0070] Step 506: If the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical device by reducing the output power strategy to reduce the output power of the PFC circuit.

[0071] It can be understood that the larger the cycle average duty ratio, the greater the loss of the power switching device, and the higher the temperature rise of the power switching device. The current maximum cycle average duty ratio is the maximum cycle average duty ratio that can be output to the power switching device under the current operating state, that is, the maximum cycle average duty ratio corresponding to when the temperature rise of the power switching device reaches the upper limit. Therefore, if the cycle average duty ratio is greater than the current maximum cycle average duty ratio, it means that the current temperature rise of the power switching device has exceeded the upper limit, and the cycle average duty ratio needs to be immediately reduced to reduce the temperature rise of the power switching device.

[0072] In some embodiments of the present disclosure, controlling the electrical device by reducing the output power strategy can reduce the output power of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and achieving the purpose of reducing the temperature rise of the power switching device.

[0073] As an implementation manner, the implementation manner of controlling the electrical device by reducing the output power strategy may include: reducing the output power of the PFC circuit by adjusting the operating frequency of the PFC post-stage. For example, if the electrical device is an air conditioner, the output power of the PFC circuit can be reduced by adjusting the operating frequency of the post-stage compressor.

[0074] As an example, the operating frequency of the compressor can be adjusted according to a preset reduction rate. For example, the compressor speed can be adjusted at a rate of reducing the compressor frequency by 1 Hz every 5 s.

[0075] As another example, the duty ratio difference between the cycle average duty ratio and the current maximum cycle average duty ratio can be determined; according to the duty ratio difference, the adjustment rate of the compressor frequency can be determined; and the operating frequency of the compressor can be adjusted according to the adjustment rate to reduce the PFC output power.

[0076] According to the control method of the electrical equipment according to an embodiment of the present disclosure, when the state parameter includes the current ambient temperature, based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio, the current maximum cycle average duty ratio is determined, and when the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the electrical equipment is controlled by a strategy of reducing the output power to reduce the output power of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and reducing the temperature of the power switching device to avoid damage to the power switching device.

[0077] For some indoor electrical equipment, the ambient temperature hardly changes, and when the input voltage changes greatly, the input voltage can be regarded as a factor that seriously affects the temperature rise of the power switching device. Therefore, in this case, the state parameter of the PFC circuit in the current power frequency cycle can include the current input voltage. Next, for this scenario, the control method of the electrical equipment will be introduced.

[0078] Figure 6 is a flowchart of another control method of an electrical equipment shown according to an exemplary embodiment. Among them, the state parameter of the current power frequency cycle includes the current input voltage. As Figure 6 shown, based on the above embodiment, Figure 1 step 103 in can include the following steps:

[0079] Step 601, based on the preset correspondence between the input voltage and the second maximum cycle average duty ratio, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature.

[0080] Since the lower the input voltage, the higher the temperature rise of the power switching device when the PFC circuit maintains the same output, the correspondence between the input voltage and the second maximum cycle average duty ratio can be determined through a series of tests. Among them, the second maximum cycle average duty ratio refers to the maximum cycle average duty ratio allowed to be output to the power switching device determined based on the change of the input voltage.

[0081] As an example, the input voltage can be continuously reduced, and under the condition that other conditions are rated, the second maximum cycle average duty ratio corresponding to the power switching device when reaching the upper limit temperature rise at each input voltage is tested, and the correspondence between the input voltage and the second maximum cycle average duty ratio as shown in Figure 7 is obtained.

[0082] Step 602, determine the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0083] According to the control method of an electrical appliance device according to an embodiment of the present disclosure, based on the corresponding relationship between the preset input voltage and the second maximum cycle average duty ratio, the second maximum cycle average duty ratio corresponding to the current input voltage can be determined, and the second maximum cycle average duty ratio is determined as the current maximum cycle average duty ratio. Then, according to the cycle average duty ratio and the current maximum cycle average duty ratio, the electrical appliance device is controlled. That is to say, for a scenario where the input voltage has a great influence on the temperature rise of the power switch device, the relationship between the input voltage and the maximum cycle average duty ratio established in advance can be used to determine the current maximum cycle average duty ratio to achieve the control of the electrical appliance device, thereby avoiding excessive temperature rise of the power switch device.

[0084] Figure 8 It is a flowchart of another control method of an electrical appliance device shown according to an exemplary embodiment. As Figure 8 shown, the method may include the following steps:

[0085] Step 801, obtain the cycle average duty ratio of the power switch device in the current power frequency cycle in the PFC circuit.

[0086] Step 802, obtain the state parameters of the PFC circuit in the current power frequency cycle; wherein, the state parameters include the current input voltage.

[0087] Step 803, based on the corresponding relationship between the preset input voltage and the second maximum cycle average duty ratio, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature.

[0088] Step 804, determine the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0089] Step 805, compare the cycle average duty ratio with the current maximum cycle average duty ratio.

[0090] Step 806, if the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical appliance device by means of a reduced output power strategy and a reduced output voltage strategy to reduce the output power and output voltage of the PFC circuit.

[0091] It can be understood that the larger the cycle average duty ratio, the greater the loss of the power switch device, and the higher the temperature rise of the power switch device. The current maximum cycle average duty ratio is the maximum cycle average duty ratio that can be output to the power switch device in the current operating state, that is, the maximum cycle average duty ratio corresponding when the temperature rise of the power switch device reaches the upper limit. Therefore, if the cycle average duty ratio is greater than the current maximum cycle average duty ratio, it means that the current temperature rise of the power switch device has exceeded the upper limit, and it is necessary to immediately reduce the cycle average duty ratio to reduce the temperature rise of the power switch device.

[0092] Since reducing the output power and reducing the output voltage can both reduce the losses of power switching devices, the electrical equipment can be controlled by the strategies of reducing the output power and reducing the output voltage to reduce the output power and output voltage of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and achieving the purpose of reducing the temperature rise of the power switching device.

[0093] As an implementation method, the implementation method of controlling the electrical equipment by the strategy of reducing the output power may include: reducing the output power of the PFC circuit by adjusting the operating frequency of the stage after the PFC. For example, if the electrical equipment is an air conditioner, the output power of the PFC circuit can be reduced by adjusting the operating frequency of the compressor in the subsequent stage. As an example, the operating frequency of the compressor can be adjusted at a preset reduction rate. For example, the compressor speed can be adjusted at a rate of reducing the compressor frequency by 1 Hz every 5 s. As another example, the duty ratio difference between the cycle average duty ratio and the current maximum cycle average duty ratio can be determined; according to the duty ratio difference, the adjustment rate of the compressor frequency can be determined; and the operating frequency of the compressor can be adjusted according to this adjustment rate to reduce the output power of the PFC circuit.

[0094] As an implementation method, the implementation method of controlling the electrical equipment by the strategy of reducing the output voltage may include: adjusting the output voltage of the PFC circuit based on a preset output voltage reduction rate. For example, the output voltage of the PFC circuit can be adjusted at a rate of reducing the PFC output voltage by 3 V every 5 s.

[0095] As another implementation method, when the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the duty ratio difference is determined; based on the pre-established correspondence between the duty ratio difference and the output voltage reduction rate, the output voltage reduction rate corresponding to the duty ratio difference is determined, and the output voltage of the PFC circuit is adjusted at this rate.

[0096] According to the control method of the electrical equipment according to the embodiments of the present disclosure, when the state parameter includes the current input voltage, based on the preset correspondence between the input voltage and the second maximum cycle average duty ratio, the current maximum cycle average duty ratio is determined, and when the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the electrical equipment is controlled by the strategies of reducing the output power and reducing the output voltage to reduce the output power and output voltage of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and reducing the temperature of the power switching device to avoid damage to the power switching device.

[0097] In addition, the state parameter obtained in step 102 may include the current environment and the current input voltage. Next, the control method of the electrical equipment in this case will be introduced.

[0098] Figure 9 is a flowchart of a control method for another electrical device shown according to an exemplary embodiment. Among them, the state parameters of the current power frequency cycle include the current input voltage and the current ambient temperature. As Figure 9 shown, based on the above embodiment, Figure 1 step 103 in

[0099] Step 901: Determine the first maximum cycle average duty ratio corresponding to the current ambient temperature based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio.

[0100] It should be noted that Figure 9 the implementation manner of step 901 in Figure 3 is the same as the implementation manner of step 301 in

[0101] and will not be elaborated here.

[0102] It should be noted that Figure 9 the implementation manner of step 901 in Figure 6 is the same as the implementation manner of step 601 in

[0103] and will not be elaborated here.

[0104] In some embodiments of the present disclosure, the implementation manner of determining the current maximum cycle average duty ratio according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio may be to determine any one of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio based on the usage scenario of the electrical device. If the electrical device can be used in different scenarios, the current maximum cycle average duty ratio may be determined from the first maximum cycle average duty ratio and the second maximum cycle average duty ratio based on the current usage scenario of the electrical device. For example, if the environment in the current usage scenario of the electrical device is relatively harsh, the ambient temperature is relatively high, and the input voltage is relatively stable, the first maximum cycle average duty ratio may be determined as the current maximum cycle average duty ratio.

[0105] In some other embodiments of the present disclosure, the implementation manner of determining the current maximum cycle average duty ratio according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio may be to determine the minimum value of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0106] In still some other embodiments of the present disclosure, the first maximum cycle average duty ratio and the second maximum cycle average duty ratio may also be weighted and summed, and the weighted sum result is determined as the current maximum cycle average duty ratio. Wherein, the weights of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio may be preset.

[0107] In still some other embodiments of the present disclosure, for the usage scenario of the electrical equipment, it is possible that both the ambient temperature and the input voltage have a greater impact on the temperature rise of the power switching device. In this case, both the first maximum cycle average duty ratio and the second maximum cycle average duty ratio may be determined as the current maximum cycle average duty ratio.

[0108] According to the control method of the electrical equipment according to the embodiments of the present disclosure, the first maximum cycle average duty ratio corresponding to the current ambient temperature may be determined based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio, and the second maximum cycle average duty ratio corresponding to the current input voltage may be determined based on the preset correspondence between the input voltage and the second maximum cycle average duty ratio. Then, the current maximum cycle average duty ratio is determined according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the electrical equipment is controlled according to the cycle average duty ratio and the current maximum cycle average duty ratio to avoid excessive temperature rise of the power switching device.

[0109] Next, the specific implementation process of the control method of the electrical equipment when the state parameters include the current ambient and the current input voltage will be introduced in detail.

[0110] Figure 10 is a flowchart of another control method of an electrical equipment shown according to an exemplary embodiment. As Figure 10 shown, the method may include the following steps:

[0111] Step 1001, obtain the cycle average duty ratio of the power switching device in the PFC circuit in the current power frequency cycle.

[0112] Step 1002, obtain the state parameters of the PFC circuit in the current power frequency cycle; wherein, the state parameters include the current ambient temperature and the current input voltage.

[0113] Step 1003, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio.

[0114] Step 1004, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature based on the preset correspondence between the input voltage and the second maximum cycle average duty ratio.

[0115] Step 1005: Determine the current maximum cycle average duty ratio according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio.

[0116] In some embodiments of the present disclosure, the implementation manner of step 1005 may include any one of the following:

[0117] Step 1005-1: Based on the usage scenario of the electrical device, determine either the first maximum cycle average duty ratio or the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0118] That is to say, based on the usage scenario of the electrical device, a target factor affecting the temperature rise of the power switch device can be determined between the ambient temperature and the input voltage, and then the maximum cycle average duty ratio corresponding to the target factor is determined as the current maximum cycle average duty ratio. For example, if based on the usage scenario of the electrical device, the ambient temperature is determined as the target factor, then the first maximum cycle average duty ratio is determined as the current maximum cycle average duty ratio; if based on the usage scenario of the electrical device, the input voltage is determined as the target factor, then the second maximum cycle average duty ratio is determined as the current maximum cycle average duty ratio.

[0119] Step 1005-2: Determine the minimum value between the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0120] Step 1006: When it is determined that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical device by means of a reduced output power strategy to reduce the output power of the PFC circuit.

[0121] Step 1007: When it is determined that the current maximum cycle average duty ratio is the second maximum cycle average duty ratio and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical device by means of a reduced output power strategy and a reduced output voltage strategy to reduce the output power and output voltage of the PFC circuit.

[0122] That is to say, if the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and the current maximum cycle average duty ratio is the first maximum cycle average duty ratio, the output power of the PFC circuit can be reduced by controlling the electrical device through the output power reduction strategy, thereby indirectly reducing the cycle average duty ratio of the power switching device and achieving the purpose of reducing the temperature rise of the power switching device. If the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and the current maximum cycle average duty ratio is the second maximum cycle average duty ratio, the output power and output voltage of the PFC circuit can be reduced by controlling the electrical device through the output power reduction strategy and the output voltage reduction strategy, thereby indirectly reducing the cycle average duty ratio of the power switching device and achieving the purpose of reducing the temperature rise of the power switching device.

[0123] Among them, the specific implementation method of controlling the electrical device through the output power reduction strategy and the output voltage reduction strategy is the same as that in the above embodiment, and will not be elaborated here.

[0124] According to the control method of the electrical device according to the embodiment of the present disclosure, when the state parameter includes the current input voltage and the current ambient temperature, the first maximum cycle average duty ratio is determined based on the preset corresponding relationship between the ambient temperature and the first maximum cycle average duty ratio, and the second maximum cycle average duty ratio is determined based on the preset corresponding relationship between the input voltage and the second maximum cycle average duty ratio. Then, one of the first maximum cycle average duty ratio and the second maximum average duty ratio is determined as the current maximum cycle average duty ratio. When the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the electrical device is controlled through the output power reduction strategy. When the current maximum cycle average duty ratio is the second maximum cycle average duty ratio and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, the electrical device is controlled through the output power reduction strategy and the output voltage reduction strategy to reduce the output power and output voltage of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and reducing the temperature of the power switching device to avoid damage to the power switching device.

[0125] Figure 11 It is a flowchart of another control method of an electrical device shown according to an exemplary embodiment. As Figure 11 shown, the method may include the following steps:

[0126] Step 1101, obtain the cycle average duty ratio of the power switching device in the current power frequency cycle in the PFC circuit.

[0127] Step 1102, obtain the state parameters of the PFC circuit in the current power frequency cycle; wherein, the state parameters include the current ambient temperature and the current input voltage.

[0128] Step 1103: Based on the corresponding relationship between the preset ambient temperature and the first maximum cycle average duty ratio, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature.

[0129] Step 1104: Based on the corresponding relationship between the preset input voltage and the second maximum cycle average duty ratio, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature.

[0130] Step 1105: Determine both the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0131] It can be understood that in the usage scenarios of some electrical appliances, both the ambient temperature and the input voltage will change, and both will affect the temperature rise of the power switch device. In this case, both the first maximum cycle average duty ratio and the second maximum cycle average duty ratio can be determined as the current maximum cycle average duty ratio.

[0132] Step 1106: Determine that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the first maximum cycle average duty ratio, and the cycle average duty ratio is less than or equal to the second maximum cycle average duty ratio. Control the electrical appliance through the output power reduction strategy to reduce the output power of the PFC circuit.

[0133] Since the first maximum cycle average duty ratio is the maximum cycle average duty ratio corresponding to the upper limit of the temperature rise of the power switch device at the current ambient temperature, if the cycle average duty ratio is greater than the first maximum cycle average duty ratio, it means that the current temperature rise of the power switch device has exceeded the upper limit, and the cycle average duty ratio needs to be reduced to reduce the temperature rise of the power switch device.

[0134] In some embodiments of the present disclosure, by controlling the electrical appliance through the output power reduction strategy, the output power of the PFC circuit can be reduced, thereby indirectly reducing the cycle average duty ratio of the power switch device and achieving the purpose of reducing the temperature rise of the power switch device. Among them, the specific implementation manner of controlling the electrical appliance through the output power reduction strategy is the same as that in the above embodiments and will not be elaborated here.

[0135] Step 1107: Determine that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the second maximum cycle average duty ratio. Control the electrical appliance through the output power reduction strategy and the output voltage reduction strategy to reduce the output power and output voltage of the PFC circuit.

[0136] Since the second maximum cycle average duty ratio is the maximum cycle average duty ratio corresponding to the upper limit of the temperature rise of the power switching device under the current input voltage, if the cycle average duty ratio is greater than the second maximum cycle average duty ratio, it indicates that the temperature rise of the current power switching device has exceeded the upper limit, and the cycle average duty ratio needs to be reduced to lower the temperature rise of the power switching device.

[0137] Also, since reducing the output power and reducing the output voltage can both reduce the losses of the power switching device, the electrical equipment can be controlled by the output power reduction strategy and the output voltage reduction strategy to reduce the output power of the PFC circuit and the output voltage of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and achieving the purpose of reducing the temperature rise of the power switching device.

[0138] Among them, the specific implementation methods of controlling the electrical equipment by the output power reduction strategy and the output voltage reduction strategy are the same as those in the above embodiments and will not be elaborated here.

[0139] According to the control method of the electrical equipment in the embodiments of the present disclosure, when the state parameters include the current input voltage and the current ambient temperature, based on the preset correspondence between the ambient temperature and the first maximum cycle average duty ratio, the first maximum cycle average duty ratio is determined, and based on the preset correspondence between the input voltage and the second maximum cycle average duty ratio, the second maximum cycle average duty ratio is determined. Then, both the first maximum cycle average duty ratio and the second maximum average duty ratio are determined as the current maximum cycle average duty ratio. When the cycle average duty ratio is greater than the first cycle average duty ratio and less than or equal to the second cycle average duty ratio, the electrical equipment is controlled by the output power reduction strategy. When the cycle average duty ratio is greater than the second cycle average duty ratio, the electrical equipment is controlled by the output power reduction strategy and the output voltage reduction strategy to reduce the output power and the output voltage of the PFC circuit, thereby indirectly reducing the cycle average duty ratio of the power switching device and reducing the temperature of the power switching device to avoid damage to the power switching device.

[0140] To implement the above embodiments, the present disclosure provides a control device for an electrical equipment.

[0141] Figure 12 It is a structural block diagram of a control device for an electrical equipment shown according to an exemplary embodiment. As Figure 12 shown, the device includes a first acquisition module 1210, a second acquisition module 1220, a determination module 1230, and a control module 1240. Among them:

[0142] The first acquisition module 1210 is configured to acquire the cycle average duty ratio of the power switching device in the PFC circuit in the current power frequency cycle;

[0143] The second acquisition module 1220 is configured to acquire the state parameters of the PFC circuit in the current power frequency cycle;

[0144] The determination module 1230 is configured to determine the current maximum cycle average duty ratio of the power switch device according to the state parameters;

[0145] The control module 1240 is configured to control the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio.

[0146] Wherein, the state parameters include the current ambient temperature and / or the current input voltage.

[0147] In some embodiments of the present disclosure, the state parameters include the current environment; the determination module 1230 is specifically configured to

[0148] Based on the correspondence between the preset ambient temperature and the first maximum cycle average duty ratio, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature;

[0149] Determine the first maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0150] As a possible implementation manner, the control module 1240 is specifically configured to:

[0151] Compare the cycle average duty ratio with the current maximum cycle average duty ratio;

[0152] If the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical equipment through a strategy of reducing the output power to reduce the output power of the PFC circuit.

[0153] In some other embodiments of the present disclosure, the state parameters include the current input voltage; the determination module 1230 is specifically configured to:

[0154] Based on the correspondence between the preset input voltage and the second maximum cycle average duty ratio, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature;

[0155] Determine the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0156] As a possible implementation manner, the control module 1240 is specifically configured to:

[0157] Compare the cycle average duty ratio with the current maximum cycle average duty ratio;

[0158] If the cycle average duty ratio is greater than the current maximum cycle average duty ratio, control the electrical equipment through a strategy of reducing the output power and a strategy of reducing the output voltage to reduce the output power and the output voltage of the PFC circuit.

[0159] In still some other embodiments of the present disclosure, the state parameter includes the current environment and the current input voltage; the determining module 1230 is specifically configured to:

[0160] Based on the corresponding relationship between the preset ambient temperature and the first maximum cycle average duty ratio, determine the first maximum cycle average duty ratio corresponding to the current ambient temperature;

[0161] Based on the corresponding relationship between the preset input voltage and the second maximum cycle average duty ratio, determine the second maximum cycle average duty ratio corresponding to the current ambient temperature;

[0162] Determine the current maximum cycle average duty ratio according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio.

[0163] As an example, the determining module 1230 is further configured to perform any one of the following:

[0164] Based on the usage scenario of the electrical device, determine any one of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio;

[0165] Determine the minimum value of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio;

[0166] Determine both the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

[0167] As a possible implementation manner, the control module 1240 is specifically configured to:

[0168] Determine that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio, and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and control the electrical device through a reduced output power strategy to reduce the output power of the PFC circuit; or,

[0169] Determine that the current maximum cycle average duty ratio is the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and control the electrical device through a reduced output power strategy and a reduced output voltage strategy to reduce the output power and the output voltage of the PFC circuit; or,

[0170] Determine that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the first maximum cycle average duty ratio, and the cycle average duty ratio is less than or equal to the second maximum cycle average duty ratio, and control the electrical device through a reduced output power strategy to reduce the output power of the PFC circuit; or,

[0171] Determine that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the second maximum cycle average duty ratio. Control the electrical equipment by means of a reduced output power strategy and a reduced output voltage strategy to reduce the output power and output voltage of the PFC circuit.

[0172] Regarding the device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0173] According to the control device of an electrical equipment provided by an embodiment of the present disclosure, by obtaining the cycle average duty ratio of a power switching device in a PFC circuit in a current power frequency cycle, and obtaining the state parameter of the PFC circuit in the current power frequency cycle, determine the current maximum cycle average duty ratio of the power switching device according to the state parameter, and control the electrical equipment according to the cycle average duty ratio and the current maximum cycle average duty ratio. Without the need for an additional temperature sensor, this solution can control the electrical equipment based on the cycle average duty ratio and the current maximum cycle average duty ratio to avoid the situation where the temperature rise of the power switching device is too high, which can not only reduce the implementation cost but also avoid the burnout of the power switching device.

[0174] To implement the above embodiments, the present disclosure provides an electrical equipment.

[0175] Figure 13 FIG. 13 is a structural block diagram of an electrical equipment 1300 for implementing a control method of an electrical equipment shown according to an exemplary embodiment. It should be noted that the electrical equipment 1300 of the embodiments of the present disclosure is equipped with a PFC circuit and can be equipment such as an air conditioner, a refrigerator, and a power supply equipment equipped with a PFC circuit.

[0176] Refer to Figure 13 , the electrical equipment 1300 may include one or more of the following components: a processing component 1302, a memory 1304, a power component 1306, a multimedia component 1308, an audio component 1310, an input / output (I / O) interface 1313, a sensor component 1314, and a communication component 1316.

[0177] The processing component 1302 generally controls the overall operation of the electrical device 1300, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 1302 may include one or more processors 1320 to execute instructions to complete all or part of the steps of the above - mentioned methods. In addition, the processing component 1302 may include one or more modules to facilitate the interaction between the processing component 1302 and other components. For example, the processing component 1302 may include a multimedia module to facilitate the interaction between the multimedia component 1308 and the processing component 1302.

[0178] The memory 1304 is configured to store various types of data to support the operation of the device 1300. Examples of such data include instructions for any application or method operating on the electrical device 1300, contact data, phone book data, messages, pictures, videos, etc. The memory 1304 can be implemented by any type of volatile or non - volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read - only memory (EEPROM), erasable programmable read - only memory (EPROM), programmable read - only memory (PROM), read - only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0179] The power component 1306 provides power for various components of the electrical device 1300. The power component 1306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the electrical device 1300.

[0180] The multimedia component 1308 includes a screen that provides an output interface between the electrical device 1300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of the touch or swipe actions, but also detect the duration and pressure associated with the touch or swipe operation.

[0181] The audio component 1310 is configured to output and / or input audio signals. For example, the audio component 1310 includes a microphone (MIC) that is configured to receive external audio signals when the electrical device 1300 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 1304 or transmitted via the communication component 1316. In some embodiments, the audio component 1310 also includes a speaker for outputting audio signals.

[0182] The I / O interface 1313 provides an interface between the processing component 1302 and a peripheral interface module, and the peripheral interface module may be a keyboard, a click wheel, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a power-on button, and a lock button.

[0183] The sensor component 1314 includes one or more sensors for providing a status assessment of various aspects of the electrical device 1300. For example, the sensor component 1314 can detect the on / off state of the device 1300, the relative positioning of components, such as the display and keypad of the electrical device 1300, the sensor component 1314 can also detect a change in the position of the electrical device 1300 or a component of the electrical device 1300, the presence or absence of user contact with the electrical device 1300, the orientation or acceleration / deceleration of the electrical device 1300, and the temperature change of the electrical device 1300. The sensor component 1314 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. In some embodiments, the sensor component 1314 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0184] The communication component 1316 is configured to facilitate communication between the electrical device 1300 and other devices in a wired or wireless manner. The electrical device 1300 may access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1316 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0185] In an exemplary embodiment, the electrical device 1300 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above method.

[0186] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 1304 including instructions, and the instructions can be executed by a processor 1320 of an electrical device 1300 to complete the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0187] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include common general knowledge or conventional technical means in the technical field not disclosed in this disclosure. The specification and embodiments are only to be considered as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0188] It should be understood that the present invention is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A control method for an electrical device, characterized in that, The electrical device is equipped with a power factor correction (PFC) circuit, including: Obtaining the cycle-averaged duty ratio of the power switch device in the PFC circuit during the current power frequency cycle; Obtaining the state parameter of the PFC circuit during the current power frequency cycle; Determining the current maximum cycle-averaged duty ratio of the power switch device according to the state parameter; Controlling the electrical device according to the cycle-averaged duty ratio and the current maximum cycle-averaged duty ratio.

2. The method according to claim 1, characterized in that, The state parameter includes the current ambient temperature and / or the current input voltage.

3. The method according to claim 2, wherein The state parameter includes the current ambient temperature; the determining the current maximum cycle-averaged duty ratio of the power switch device according to the state parameter includes: Determining the first maximum cycle-averaged duty ratio corresponding to the current ambient temperature based on the preset correspondence between the ambient temperature and the first maximum cycle-averaged duty ratio; Determining the first maximum cycle-averaged duty ratio as the current maximum cycle-averaged duty ratio.

4. The method according to claim 3, wherein The controlling the electrical device according to the cycle-averaged duty ratio and the current maximum cycle-averaged duty ratio includes: Comparing the cycle-averaged duty ratio with the current maximum cycle-averaged duty ratio; If the cycle-averaged duty ratio is greater than the current maximum cycle-averaged duty ratio, controlling the electrical device by a strategy of reducing the output power to reduce the output power of the PFC circuit.

5. The method according to claim 2, wherein The state parameter includes the current input voltage; The determining the current maximum cycle-averaged duty ratio of the power switch device according to the state parameter includes: Determining the second maximum cycle-averaged duty ratio corresponding to the current ambient temperature based on the preset correspondence between the input voltage and the second maximum cycle-averaged duty ratio; Determining the second maximum cycle-averaged duty ratio as the current maximum cycle-averaged duty ratio.

6. The method according to claim 5, wherein The controlling the electrical device according to the cycle-averaged duty ratio and the current maximum cycle-averaged duty ratio includes: Comparing the cycle-averaged duty ratio with the current maximum cycle-averaged duty ratio; If the cycle-averaged duty ratio is greater than the current maximum cycle-averaged duty ratio, controlling the electrical device by a strategy of reducing the output power and a strategy of reducing the output voltage to reduce the output power and the output voltage of the PFC circuit.

7. The method according to claim 2, wherein The state parameter includes the current environment and the current input voltage; the determining the current maximum cycle-averaged duty ratio of the power switch device according to the state parameter includes: Determining the first maximum cycle-averaged duty ratio corresponding to the current ambient temperature based on the preset correspondence between the ambient temperature and the first maximum cycle-averaged duty ratio; Determining the second maximum cycle-averaged duty ratio corresponding to the current ambient temperature based on the preset correspondence between the input voltage and the second maximum cycle-averaged duty ratio; Determining the current maximum cycle-averaged duty ratio according to the first maximum cycle-averaged duty ratio and the second maximum cycle-averaged duty ratio.

8. The method according to claim 7, wherein Determining the current maximum cycle average duty ratio according to the first maximum cycle average duty ratio and the second maximum cycle average duty ratio includes any of the following: Based on the usage scenario of the electrical device, determining any one of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio; Determining the minimum value of the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio; Determining both the first maximum cycle average duty ratio and the second maximum cycle average duty ratio as the current maximum cycle average duty ratio.

9. The method according to claim 8, wherein Controlling the electrical device according to the cycle average duty ratio and the current maximum cycle average duty ratio includes: Determining that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio, and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and controlling the electrical device by a strategy of reducing the output power to reduce the output power of the PFC circuit; or, Determining that the current maximum cycle average duty ratio is the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the current maximum cycle average duty ratio, and controlling the electrical device by a strategy of reducing the output power and a strategy of reducing the output voltage to reduce the output power and the output voltage of the PFC circuit; or, Determining that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the first maximum cycle average duty ratio, and the cycle average duty ratio is less than or equal to the second maximum cycle average duty ratio, and controlling the electrical device by a strategy of reducing the output power to reduce the output power of the PFC circuit; or, Determining that the current maximum cycle average duty ratio is the first maximum cycle average duty ratio and the second maximum cycle average duty ratio, and the cycle average duty ratio is greater than the second maximum cycle average duty ratio, and controlling the electrical device by a strategy of reducing the output power and a strategy of reducing the output voltage to reduce the output power and the output voltage of the PFC circuit.

10. A control device for an electrical equipment, characterized in that, The electrical device is equipped with a power factor correction (PFC) circuit, including: A first acquisition module for acquiring the cycle average duty ratio of a power switching device in the PFC circuit in the current power frequency cycle; A second acquisition module for acquiring the state parameters of the PFC circuit in the current power frequency cycle; A determination module for determining the current maximum cycle average duty ratio of the power switching device according to the state parameters; A control module for controlling the electrical device according to the cycle average duty ratio and the current maximum cycle average duty ratio.

11. An electrical device, characterized in that, The electrical equipment is equipped with a power factor correction (PFC) circuit. The electrical equipment includes: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the method according to any one of claims 1 to 9 is implemented.

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