Fan, control method and device thereof and readable storage medium

Abstract

The invention provides a fan, a control method and device of the fan and a readable storage medium. The fan comprises a multi-gear switch. The control method comprises the steps that a target operation signal of a target wind speed gear selected by a user is obtained; determining a first switch and a second switch corresponding to the target operation signal from the multi-gear switch; obtaining a zero-crossing signal of the power grid, and determining a target zero-crossing signal; the first switch is turned on, and the second switch and the first switch are alternately turned on at each target zero-crossing signal. Therefore, different gear switches are alternately conducted at the zero-crossing signal position of the power grid, namely, different windings are switched and conducted at the zero-crossing point position, the corresponding target wind speed gear can be switched, the wind speed gear capable of being achieved by the fan can be increased without adding a speed regulation capacitor, a silicon controlled rectifier and a driving circuit of the silicon controlled rectifier in the fan, the manufacturing cost of the fan is reduced, and the fan is more convenient to use. And the working reliability of the fan is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a fan and a control method and device thereof, and a readable storage medium. Background Art

[0002] With the development of technology, the types and styles of fans are becoming more and more diverse. As one of the main components of fans, motors can be divided into AC motors and DC motors. Among them, the main advantage of DC motors is that they can achieve stepless speed regulation, but their cost is relatively high. Ordinary AC motors are widely used in fans due to their low cost.

[0003] Among them, AC motors usually use taps to adjust speed. Considering production and cost, the taps are usually set to 3 to 4, such as Figure 3 As shown in the figure, taking 3 taps as an example, the fan motor can be adjusted to 3 speeds by switching the 3 taps. On this basis, if more fan speeds are required, such as Figure 5 As shown, the speed regulating capacitor is usually added to increase the fan's 3-speed speed regulation to 6-speed speed regulation.

[0004] However, the multi-speed speed regulation scheme of the above-mentioned fan requires additional speed regulation capacitors, thyristors and their driving circuits, the manufacturing cost of the fan is high, and the reliability of the fan operation is poor. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present invention is to provide a method for controlling a fan.

[0007] A second aspect of the present invention is to provide a control device for a fan.

[0008] A third aspect of the present invention is to provide a fan.

[0009] A fourth aspect of the present invention is to provide a readable storage medium.

[0010] In view of this, according to a first aspect of the present invention, a control method for a fan is proposed, the fan comprising a multi-speed switch, and the control method comprising: obtaining a target operation signal of a user selecting a target wind speed speed; determining a first switch and a second switch corresponding to the target operation signal from the multi-speed switch; obtaining a zero-crossing signal of a power grid, and determining a target zero-crossing signal; turning on the first switch, and alternately turning on the second switch and the first switch at each target zero-crossing signal.

[0011] The execution subject of the technical solution of the fan control method provided by the present invention can be a fan, or a fan control device, and can also be determined according to actual use requirements, which is not specifically limited here. In order to more clearly describe the fan control method provided by the present invention, the execution subject of the fan control method is described below as a fan control device.

[0012] The fan control method provided by the present invention is used to control the operation of the fan, and the fan includes a multi-position switch.

[0013] Specifically, in the control method of the fan provided by the present invention, after the user selects the target wind speed gear of the fan, the control device can obtain the target operation signal generated by the user selecting the target wind speed gear, and then select the first switch and the second switch corresponding to the target wind speed gear from the multi-gear switch of the fan based on the target operation signal. Further, the control device turns on the first switch, obtains the zero-crossing signal of the power grid, and selects the target zero-crossing signal from the zero-crossing signal of the power grid, and then alternately turns on the second switch and the first switch at each target zero-crossing signal. In this way, at the zero-crossing signal of the power grid, different gear switches are alternately turned on, that is, different windings are switched on at the zero-crossing point, and the corresponding target wind speed gear can be changed. There is no need to add a speed regulating capacitor, a thyristor and its driving circuit to the fan, and the wind speed gear that the fan can achieve can be increased, which reduces the production cost of the fan and improves the reliability of the fan operation.

[0014] The fan control method according to the present invention may also have the following additional technical features:

[0015] In some technical schemes, optionally, the multi-position switch includes multiple position switches corresponding to different wind speeds; the target wind speed position includes multiple wind speed positions corresponding to different wind speeds; wherein, the wind speed of the N+1th wind speed position>the wind speed of the Nth wind speed position, the wind speed of the first switch corresponding to the N+1th wind speed position≥the wind speed of the first switch corresponding to the Nth wind speed position, the wind speed of the second switch corresponding to the N+1th wind speed position≥the wind speed of the second switch corresponding to the Nth wind speed position, and N≥1.

[0016] In this technical solution, the multi-position switch includes a plurality of position switches corresponding to different wind speeds.

[0017] Furthermore, the target wind speed level includes a plurality of wind speed levels corresponding to different wind speeds.

[0018] Among them, the wind speed at the Nth wind speed level is less than the wind speed at the N+1th wind speed level.

[0019] Wherein, N is a positive integer greater than or equal to 1.

[0020] Furthermore, the wind speed of the first switch corresponding to the Nth wind speed gear is less than or equal to the wind speed of the first switch corresponding to the N+1th wind speed gear, and the wind speed of the second switch corresponding to the Nth wind speed gear is less than or equal to the wind speed of the second switch corresponding to the N+1th wind speed gear.

[0021] In this way, by controlling the gear switches of different wind speeds based on the zero-crossing signal of the power grid and the software algorithm, the wind speed gear of the fan corresponding to different wind speeds can be changed. There is no need to add speed regulating capacitors, thyristors and their driving circuits in the fan, so the achievable wind speed gears of the fan can be increased, the manufacturing cost of the fan is reduced, and the reliability of the fan operation is improved.

[0022] In some technical schemes, optionally, the multi-speed switch includes a first gear switch, a second gear switch and a third gear switch corresponding to successively decreasing wind speeds; the target wind speed gear includes a first wind speed gear, a second wind speed gear, a third wind speed gear, a fourth wind speed gear, a fifth wind speed gear and a sixth wind speed gear corresponding to successively increasing wind speeds.

[0023] In this technical solution, the multi-position switch may specifically include a third-position switch, a second-position switch and a first-position switch.

[0024] Among them, the wind speed corresponding to the first gear switch is greater than the wind speed corresponding to the second gear switch, and the wind speed corresponding to the second gear switch is greater than the wind speed corresponding to the third gear switch.

[0025] Further, when switching is performed at each zero-crossing signal, that is, when the switch is switched once every half cycle, that is, when one signal cycle is the switching cycle, the above-mentioned target wind speed gear may specifically include a first wind speed gear, a second wind speed gear, a third wind speed gear, a fourth wind speed gear, a fifth wind speed gear and a sixth wind speed gear.

[0026] Among them, the wind speed corresponding to the first wind speed gear is less than the wind speed corresponding to the second wind speed gear, the wind speed corresponding to the second wind speed gear is less than the wind speed corresponding to the third wind speed gear, the wind speed corresponding to the third wind speed gear is less than the wind speed corresponding to the fourth wind speed gear, the wind speed corresponding to the fourth wind speed gear is less than the wind speed corresponding to the fifth wind speed gear, and the wind speed corresponding to the fifth wind speed gear is less than the wind speed corresponding to the sixth wind speed gear.

[0027] In this way, by controlling the third gear switch, the second gear switch and the first gear switch based on the zero-crossing signal of the power grid and the software algorithm, the 6-speed speed regulation function of the fan can be realized. The implementation method is simple and there is no need to add speed regulation capacitors, thyristors and their drive circuits to the fan. The cost is low and the reliability of the fan operation is guaranteed.

[0028] In some technical solutions, optionally, when the target wind speed level is the first wind speed level, the first switch and the second switch are both third level switches.

[0029] In this technical solution, the target wind speed gear can be specifically the first wind speed gear, and at this time, the second switch and the first switch corresponding to the first wind speed gear are both the third gear switches. In this way, by controlling the third gear switch to always be turned on, the fan can be controlled to work at the first wind speed gear.

[0030] In some technical solutions, optionally, when the target wind speed level is the second wind speed level, the first switch is a second level switch, and the second switch is a third level switch.

[0031] In this technical solution, the target wind speed gear can be specifically the second wind speed gear. At this time, the first switch corresponding to the second wind speed gear is the second gear switch, and the second switch corresponding to the second wind speed gear is the third gear switch. In this way, based on the zero-crossing signal of the power grid, the fan can be controlled to work at the second wind speed gear by controlling the third gear switch and the second gear switch to be turned on alternately.

[0032] In some technical solutions, optionally, when the target wind speed level is the third wind speed level, the first switch and the second switch are both second level switches.

[0033] In this technical solution, the target wind speed gear can be specifically the third wind speed gear, and at this time, the second switch and the first switch corresponding to the third wind speed gear are both the second gear switch. In this way, by controlling the second gear switch to always be turned on, the fan can be controlled to work at the third wind speed gear.

[0034] In some technical solutions, optionally, when the target wind speed level is the fourth wind speed level, the first switch is a first-level switch, and the second switch is a third-level switch.

[0035] In this technical solution, the target wind speed gear can be specifically the fourth wind speed gear. At this time, the first switch corresponding to the fourth wind speed gear is the first gear switch, and the second switch corresponding to the fourth wind speed gear is the third gear switch. In this way, based on the zero-crossing signal of the power grid, the fan can be controlled to work at the fourth wind speed gear by controlling the third gear switch and the first gear switch to be turned on alternately.

[0036] In some technical solutions, optionally, when the target wind speed level is the fifth wind speed level, the first switch is a first level switch, and the second switch is a second level switch.

[0037] In this technical solution, the target wind speed gear can be specifically the fifth wind speed gear. At this time, the first switch corresponding to the fifth wind speed gear is the first gear switch, and the second switch corresponding to the fifth wind speed gear is the second gear switch. In this way, based on the zero-crossing signal of the power grid, by controlling the first gear switch and the second gear switch to be turned on alternately, the fan can be controlled to work at the fifth wind speed gear.

[0038] In some technical solutions, optionally, when the target wind speed level is the sixth wind speed level, the first switch and the second switch are both first level switches.

[0039] In this technical solution, the target wind speed gear can be specifically the sixth wind speed gear, and at this time, the second switch and the first switch corresponding to the sixth wind speed gear are both the first gear switch. In this way, by controlling the first gear switch to always be turned on, the fan can be controlled to work at the sixth wind speed gear.

[0040] According to a second aspect of the present invention, a control device for a fan is proposed, the fan includes a multi-speed switch, and the control device includes: an acquisition unit, used to obtain a target operation signal of a user selecting a target wind speed speed; a processing unit, used to determine a first switch and a second switch corresponding to the target operation signal from the multi-speed switch; an acquisition unit, used to obtain a zero-crossing signal of a power grid and determine a target zero-crossing signal; a control unit, used to turn on the first switch, and alternately turn on the second switch and the first switch at each target zero-crossing signal.

[0041] The fan control device provided by the present invention is used for controlling the operation of the fan, and the fan comprises a multi-position switch.

[0042] Specifically, the control device of the fan provided by the present invention includes an acquisition unit, a processing unit and a control unit. After the user selects the target wind speed gear of the fan, the acquisition unit can obtain the target operation signal generated by the user selecting the target wind speed gear, and the processing unit further selects the first switch and the second switch corresponding to the target wind speed gear from the multi-gear switch of the fan based on the target operation signal. Further, the control unit turns on the first switch, the acquisition unit obtains the zero-crossing signal of the power grid, the processing unit selects the target zero-crossing signal from the zero-crossing signal of the power grid, and the control unit further turns on the second switch and the first switch alternately at each target zero-crossing signal. In this way, at the zero-crossing signal of the power grid, different gear switches are alternately turned on, that is, different windings are switched on at the zero-crossing point, and the corresponding target wind speed gear can be changed. There is no need to add a speed regulating capacitor, a thyristor and its driving circuit in the fan, so that the wind speed gear that the fan can achieve can be increased, which reduces the production cost of the fan and improves the reliability of the fan operation.

[0043] According to the third aspect of the present invention, a fan is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the fan control method in any of the above technical solutions are implemented. Therefore, the fan provided in the third aspect of the present invention has all the beneficial effects of the fan control method in any of the above technical solutions in the first aspect, and will not be described in detail here.

[0044] The fan according to the present invention may also have the following additional technical features:

[0045] In some technical solutions, optionally, the fan also includes: an AC motor connected to the live wire; a multi-speed switch connected to the AC motor, the neutral wire and the processor, the multi-speed switch is used to control the operation of the AC motor; a zero-crossing detection circuit connected to the processor, the zero-crossing detection circuit is used to detect the zero-crossing signal of the power grid.

[0046] In this technical solution, the fan also includes an AC motor, a multi-position switch and a zero-crossing detection circuit.

[0047] Among them, the AC motor is connected to the live wire.

[0048] Furthermore, the multi-position switch is connected to the AC motor, the neutral line and the processor.

[0049] Further, the zero-crossing detection circuit is connected to the processor.

[0050] Furthermore, the multi-position switch is used to control the operation of the AC motor.

[0051] Furthermore, the zero-crossing detection circuit is used to detect the zero-crossing signal of the power grid and transmit the detected zero-crossing signal to the processor, which then processes and converts the zero-crossing signal and the target operation signal of the target wind speed gear selected by the user to control the multi-speed switch according to a preset program.

[0052] According to a fourth aspect of the present invention, a readable storage medium is provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, a fan control method as in any of the above technical solutions is implemented. Therefore, the readable storage medium provided in the fourth aspect of the present invention has all the beneficial effects of the fan control method in any of the technical solutions in the first aspect, and will not be described in detail here.

[0053] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0055] Figure 1 A schematic diagram showing a flow chart of a fan control method according to an embodiment of the present invention;

[0056] Figure 2 A schematic diagram showing a fan control method according to an embodiment of the present invention;

[0057] Figure 3 One of the circuit structure schematic diagrams of a fan in the related art is shown;

[0058] Figure 4 The working principle of a fan in the related art is shown;

[0059] Figure 5 The second schematic diagram of the circuit structure of a fan in the related art is shown;

[0060] Figure 6 A structural block diagram of a fan control device according to an embodiment of the present invention is shown;

[0061] Figure 7 A structural block diagram of a fan according to an embodiment of the present invention is shown;

[0062] Figure 8 A schematic structural diagram of a fan according to an embodiment of the present invention is shown.

[0063] Figure 8 Reference numerals in the figures:

[0064] 300 fan, 304 processor, 306 AC motor, 308 multi-speed switch, 310 zero-crossing detection circuit, 312 first-speed switch, 314 second-speed switch, 316 third-speed switch, 318 live wire, 320 neutral wire. DETAILED DESCRIPTION

[0065] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0066] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0067] Combine the following Figures 1 to 8 , the fan and its control method and device, and readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0068] In one embodiment of the present invention, Figure 1 As shown, the fan control method may specifically include the following steps 102 to 108:

[0069] Step 102, obtaining a target operation signal of a user selecting a target wind speed level;

[0070] Step 104, determining a first switch and a second switch corresponding to the target operation signal from the multi-position switches;

[0071] Step 106, obtaining a zero-crossing signal of the power grid and determining a target zero-crossing signal;

[0072] Step 108 , turning on the first switch, and turning on the second switch and the first switch alternately at each target zero-crossing signal.

[0073] The execution subject of the technical solution of the fan control method provided by the present invention can be a fan, or a fan control device, and can also be determined according to actual use requirements, which is not specifically limited here. In order to more clearly describe the fan control method provided by the present invention, the execution subject of the fan control method is described below as a fan control device.

[0074] The fan control method provided by the present invention is used to control the operation of the fan, and the fan comprises a multi-position switch.

[0075] Specifically, in the control method of the fan provided by the present invention, after the user selects the target wind speed gear of the fan, the control device can obtain the target operation signal generated by the user selecting the target wind speed gear, and then select the first switch and the second switch corresponding to the target wind speed gear from the multi-gear switch of the fan based on the target operation signal. Further, the control device turns on the first switch, obtains the zero-crossing signal of the power grid, and selects the target zero-crossing signal from the zero-crossing signal of the power grid, and then alternately turns on the second switch and the first switch at each target zero-crossing signal. In this way, at the zero-crossing signal of the power grid, different gear switches are alternately turned on, that is, different windings are switched on at the zero-crossing point, and the corresponding target wind speed gear can be changed. There is no need to add a speed regulating capacitor, a thyristor and its driving circuit to the fan, and the wind speed gear that the fan can achieve can be increased, which reduces the production cost of the fan and improves the reliability of the fan operation.

[0076] Among them, the first switch is any gear switch among the multi-gear switches, the second switch is any gear switch among the multi-gear switches, the first switch and the second switch can be the same gear switch, and the first switch and the second switch can also be two different gear switches, and no specific limitation is made here.

[0077] Furthermore, the correspondence between the target wind speed level and the first switch and the second switch may be pre-stored in the memory of the fan in the form of a table, which is not specifically limited herein.

[0078] Furthermore, a zero-crossing signal refers to the moment when a signal passes through the zero point, that is, the moment when the amplitude of the signal changes from a positive number to a negative number or from a negative number to a positive number. In electronics, a zero-crossing signal usually refers to the zero-crossing point in an alternating current signal.

[0079] Further, the target zero-crossing signal is selected based on a software algorithm.

[0080] In actual application, the target zero-crossing signal may appear periodically, for example, the target zero-crossing signal is each zero-crossing signal, or the target zero-crossing signal is the second, fourth, sixth, eighth zero-crossing signal, and so on. At this time, the control device switches the first switch and the second switch periodically.

[0081] Furthermore, the target zero-crossing signal may not appear periodically, that is, the control device may not switch the first switch and the second switch periodically, and no specific limitation is made here.

[0082] It is understandable that AC motors are widely used in fans due to their low cost. AC motors are usually adjusted in speed by tapping. Considering production and cost, the number of taps is usually 3 to 4. Figure 3 As shown, the conventional 3-tap motor includes a high-speed tap, a medium-speed tap and a low-speed tap, which can usually only achieve three wind speeds. The control logic is: control the high, medium and low gear switches respectively. When the high-speed gear switch is closed, the high-speed tap is connected to generate high-speed wind. When the medium-speed gear switch is closed, the medium-speed tap is connected to generate medium-speed wind. When the low-speed gear switch is closed, the low-speed tap is connected to generate low-speed wind. The specific current waveform is as follows Figure 4 shown.

[0083] On this basis, if we want to achieve more fan speed levels, such as Figure 5 As shown, it is usually necessary to add additional speed regulating capacitors, thyristors and their driving circuits to change the 3-speed speed regulation that the fan can achieve into 6-speed speed regulation, which will increase the production cost of the fan and reduce the reliability of the fan.

[0084] Therefore, based on the above-mentioned fan control method, the present invention provides a novel fan multi-speed control scheme, which detects the zero-crossing signal of the power grid, and switches different windings to access the system by alternately turning on different gear switches near the zero-crossing point, thereby realizing the change of the wind speed gear of the fan. The above scheme can save the speed regulating capacitor, thyristor and its driving circuit, and utilize the existing three taps of the AC motor in the fan to control the multi-speed switch of the fan based on the zero-crossing signal of the power grid and the software algorithm, so as to realize the 6-speed speed regulation function of the fan, and the implementation method is simple, low-cost, and ensures the reliability of the fan operation.

[0085] Exemplarily, the target zero-crossing signal is each zero-crossing signal, and the control device uses one signal cycle as a switch switching cycle, and alternately turns on the second switch and the first switch at each zero-crossing signal. Specifically, the control device first turns on the first switch, and at the first zero-crossing signal, turns off the first switch and turns on the second switch, at the second zero-crossing signal, turns off the second switch and turns on the first switch, at the third zero-crossing signal, turns off the first switch and turns on the second switch, and so on.

[0086] Exemplarily, the target zero-crossing signal is the 2Kth (K=1, 2, 3, 4...)th zero-crossing signal, and the control device uses two signal cycles as a switch switching cycle, and alternately turns on the second switch and the first switch at the 2Kth zero-crossing signal. Specifically, the control device first turns on the first switch, and at the second zero-crossing signal, turns off the first switch and turns on the second switch, at the fourth zero-crossing signal, turns off the second switch and turns on the first switch, at the sixth zero-crossing signal, turns off the first switch and turns on the second switch, and so on.

[0087] Exemplarily, the target zero-crossing signal is the 3Kth (K=1, 2, 3, 4...)th zero-crossing signal, and the control device uses three signal cycles as the switch switching cycle, and alternately turns on the second switch and the first switch at the 3Kth zero-crossing signal. Specifically, the control device first turns on the first switch, and at the third zero-crossing signal, turns off the first switch and turns on the second switch, at the sixth zero-crossing signal, turns off the second switch and turns on the first switch, at the ninth zero-crossing signal, turns off the first switch and turns on the second switch, and so on.

[0088] In actual application, when the first switch is switched to the second switch or the second switch is switched to the first switch, there may be a delay between the disconnection time of the previous switch and the turn-on time of the latter switch. The specific delay duration can be determined according to the phase difference between the voltage signal and the current signal, and no specific limitation is made here.

[0089] In addition, in the actual application process, it is not limited to the above-mentioned switch switching method. In each switch switching cycle, the on-time of the first switch can be equal to the on-time of the second switch, the on-time of the first switch can be greater than the on-time of the second switch, and the on-time of the first switch can be less than the on-time of the second switch, so as to increase the fan's more wind speed levels.

[0090] Furthermore, in actual application, after selecting the first switch and the second switch corresponding to the target wind speed level from the fan's multi-level switch, the control device can also determine whether the first switch and the second switch are the same. If they are the same, no subsequent processing is performed and the selected switch is directly turned on all the time to solve the computing resource problem.

[0091] In some embodiments of the present invention, optionally, the multi-position switch includes a plurality of position switches corresponding to different wind speeds.

[0092] Furthermore, the target wind speed level includes a plurality of wind speed levels corresponding to different wind speeds.

[0093] Among them, the wind speed at the Nth wind speed level is less than the wind speed at the N+1th wind speed level.

[0094] Wherein, N is a positive integer greater than or equal to 1.

[0095] Furthermore, the wind speed of the first switch corresponding to the Nth wind speed gear is less than or equal to the wind speed of the first switch corresponding to the N+1th wind speed gear, and the wind speed of the second switch corresponding to the Nth wind speed gear is less than or equal to the wind speed of the second switch corresponding to the N+1th wind speed gear.

[0096] In this way, by controlling the gear switches of different wind speeds based on the zero-crossing signal of the power grid and the software algorithm, the wind speed gear of the fan corresponding to different wind speeds can be changed. There is no need to add speed regulating capacitors, thyristors and their driving circuits in the fan, so the achievable wind speed gears of the fan can be increased, the manufacturing cost of the fan is reduced, and the reliability of the fan operation is improved.

[0097] Among them, when the value of N is determined and the conduction time of the first switch and the second switch in each switch switching cycle is the same under different wind speed levels, the above two "equals" cannot be satisfied at the same time to ensure that the wind speed of the Nth wind speed level is less than the wind speed of the N+1th wind speed level.

[0098] In actual application, the conduction time of the first switch and the second switch in each switch switching cycle can be adjusted so that the wind speed of the first switch corresponding to the Nth wind speed gear is greater than the wind speed of the first switch corresponding to the N+1th wind speed gear, or the wind speed of the second switch corresponding to the Nth wind speed gear is greater than the wind speed of the second switch corresponding to the N+1th wind speed gear. No specific restrictions are made here.

[0099] In some embodiments of the present invention, optionally, the multi-position switch may specifically include a third-position switch, a second-position switch and a first-position switch.

[0100] Among them, the wind speed corresponding to the first gear switch is greater than the wind speed corresponding to the second gear switch, and the wind speed corresponding to the second gear switch is greater than the wind speed corresponding to the third gear switch.

[0101] That is, the first gear switch is a high-speed gear switch H, and the first gear switch is used to connect to the high-speed tap so that the fan generates high-speed wind; the second gear switch is a medium-speed gear switch M, and the second gear switch is used to connect to the medium-speed tap so that the fan generates medium-speed wind; the third gear switch is a low-speed gear switch L, and the third gear switch is used to connect to the low-speed tap so that the fan generates low-speed wind.

[0102] Further, when switching is performed at each zero-crossing signal, that is, when the switch is switched once every half cycle, that is, when one signal cycle is the switching cycle, the above-mentioned target wind speed gear may specifically include a first wind speed gear, a second wind speed gear, a third wind speed gear, a fourth wind speed gear, a fifth wind speed gear and a sixth wind speed gear.

[0103] Among them, the wind speed corresponding to the first wind speed gear is less than the wind speed corresponding to the second wind speed gear, the wind speed corresponding to the second wind speed gear is less than the wind speed corresponding to the third wind speed gear, the wind speed corresponding to the third wind speed gear is less than the wind speed corresponding to the fourth wind speed gear, the wind speed corresponding to the fourth wind speed gear is less than the wind speed corresponding to the fifth wind speed gear, and the wind speed corresponding to the fifth wind speed gear is less than the wind speed corresponding to the sixth wind speed gear.

[0104] In this way, by controlling the third gear switch, the second gear switch and the first gear switch based on the zero-crossing signal of the power grid and the software algorithm, the 6-speed speed regulation function of the fan can be realized. The implementation method is simple and there is no need to add speed regulation capacitors, thyristors and their drive circuits to the fan. The cost is low and the reliability of the fan operation is guaranteed.

[0105] In actual application, the wind speed corresponding to the first wind speed gear may specifically be the above-mentioned low-speed wind, the wind speed corresponding to the second wind speed gear may specifically be between the above-mentioned low-speed wind and medium-speed wind, the wind speed corresponding to the third wind speed gear may specifically be the above-mentioned medium-speed wind, the wind speed corresponding to the fourth wind speed gear may specifically be between the above-mentioned medium-speed wind and high-speed wind, the wind speed corresponding to the fifth wind speed gear may specifically be between the above-mentioned medium-speed wind and high-speed wind, and the wind speed corresponding to the sixth wind speed gear may specifically be the upper-speed wind.

[0106] In some embodiments of the present invention, the target wind speed gear may be the first wind speed gear, and the second switch and the first switch corresponding to the first wind speed gear are both the third gear switches. Thus, by controlling the third gear switch to be always turned on, the fan can be controlled to work at the first wind speed gear.

[0107] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the first wind speed gear of the fan, the control device always turns on the third gear switch, i.e., the low gear switch L, so that the low-speed tap of the AC motor is always connected to the system, so that the fan always generates low-speed wind, and the fan works at the first wind speed gear.

[0108] In some embodiments of the present invention, the target wind speed gear may be the second wind speed gear, in which case the first switch corresponding to the second wind speed gear is the second gear switch, and the second switch corresponding to the second wind speed gear is the third gear switch. In this way, based on the zero-crossing signal of the power grid, the fan can be controlled to operate at the second wind speed gear by controlling the third gear switch and the second gear switch to be turned on alternately.

[0109] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the second wind speed gear of the fan, the control device first turns on the second gear switch, that is, the mid-speed gear switch M, to connect the mid-speed tap of the AC motor to the system, so that the fan generates mid-speed wind. Further, the control device obtains the zero-crossing signal of the power grid, and at the first zero-crossing signal, disconnects the second gear switch, and turns on the third gear switch, that is, the low-speed gear switch L, to connect the low-speed tap of the AC motor to the system, so that the fan generates low-speed wind. Further, at the second zero-crossing signal, disconnect the third gear switch, and turn on the second gear switch to connect the mid-speed tap of the AC motor to the system again, so that the fan generates mid-speed wind. Further, at the third zero-crossing signal, disconnect the second gear switch, and turn on the third gear switch to connect the low-speed tap of the AC motor to the system again, so that the fan generates low-speed wind. This cycle repeats itself, and based on the zero-crossing signal of the power grid, the second gear switch and the third gear switch are alternately turned on, so that the fan finally generates wind with a wind speed between the low-speed wind and the medium-speed wind, so that the fan works at the second wind speed gear.

[0110] In some embodiments of the present invention, the target wind speed gear may be the third wind speed gear, and the second switch and the first switch corresponding to the third wind speed gear are both the second gear switch. Thus, by controlling the second gear switch to be always on, the fan can be controlled to operate at the third wind speed gear.

[0111] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the third wind speed gear of the fan, the control device always turns on the second gear switch, i.e., the mid-speed gear switch M, so that the mid-speed tap of the AC motor is always connected to the system, so that the fan always generates mid-speed wind, and the fan works at the third wind speed gear.

[0112] In some embodiments of the present invention, the target wind speed gear may be the fourth wind speed gear, in which case the first switch corresponding to the fourth wind speed gear is the first gear switch, and the second switch corresponding to the fourth wind speed gear is the third gear switch. In this way, based on the zero-crossing signal of the power grid, the fan can be controlled to operate at the fourth wind speed gear by controlling the third gear switch and the first gear switch to be alternately turned on.

[0113] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the fourth wind speed gear of the fan, the control device first turns on the first gear switch, i.e., the high-speed gear switch H, to connect the high-speed tap of the AC motor to the system, so that the fan generates high-speed wind. Further, the control device obtains the zero-crossing signal of the power grid, and at the first zero-crossing signal, disconnects the first gear switch, and turns on the third gear switch, i.e., the low-speed gear switch L, to connect the low-speed tap of the AC motor to the system, so that the fan generates low-speed wind. Further, at the second zero-crossing signal, disconnect the third gear switch, and turn on the first gear switch, so that the high-speed tap of the AC motor is connected to the system again, so that the fan generates high-speed wind. Further, at the third zero-crossing signal, disconnect the first gear switch, and turn on the third gear switch, so that the low-speed tap of the AC motor is connected to the system again, so that the fan generates low-speed wind. This cycle repeats itself, and based on the zero-crossing signal of the power grid, the first gear switch and the third gear switch are alternately turned on, so that the fan finally generates wind with a wind speed between the above-mentioned medium wind speed and high wind speed, so that the fan operates at the fourth wind speed gear.

[0114] In some embodiments of the present invention, the target wind speed gear may be the fifth wind speed gear, in which case the first switch corresponding to the fifth wind speed gear is the first gear switch, and the second switch corresponding to the fifth wind speed gear is the second gear switch. In this way, based on the zero-crossing signal of the power grid, the fan can be controlled to operate at the fifth wind speed gear by controlling the first gear switch and the second gear switch to be turned on alternately.

[0115] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the fifth wind speed gear of the fan, the control device first turns on the first gear switch, i.e., the high-speed gear switch H, to connect the high-speed tap of the AC motor to the system, so that the fan generates high-speed wind. Further, the control device obtains the zero-crossing signal of the power grid, and at the first zero-crossing signal, disconnects the first gear switch, and turns on the second gear switch, i.e., the mid-speed gear switch M, to connect the mid-speed tap of the AC motor to the system, so that the fan generates mid-speed wind. Further, at the second zero-crossing signal, disconnect the second gear switch, and turn on the first gear switch, so that the high-speed tap of the AC motor is connected to the system again, so that the fan generates high-speed wind. Further, at the third zero-crossing signal, disconnect the first gear switch, and turn on the second gear switch, so that the mid-speed tap of the AC motor is connected to the system again, so that the fan generates mid-speed wind. This cycle is repeated, and based on the zero-crossing signal of the power grid, the second gear switch and the first gear switch are alternately turned on, so that the fan finally generates a wind speed between the above-mentioned medium wind speed and high wind speed, but greater than the wind speed of the fourth wind speed gear, so that the fan operates at the fifth wind speed gear.

[0116] In some embodiments of the present invention, the target wind speed gear may be the sixth wind speed gear, and the second switch and the first switch corresponding to the sixth wind speed gear are both the first gear switch. Thus, by controlling the first gear switch to be always turned on, the fan can be controlled to work at the sixth wind speed gear.

[0117] Specifically, taking the case where switching is performed at each zero-crossing signal, that is, taking one signal cycle as the switching cycle, as follows: Figure 2 As shown, when the user selects the sixth wind speed gear of the fan, the control device always turns on the first gear switch, i.e., the high-speed gear switch H, so that the high-speed tap of the AC motor is always connected to the system, so that the fan always generates high-speed wind, and the fan works at the sixth wind speed gear.

[0118] In actual application, in addition to the above-mentioned six wind speed gears, by adjusting the switching cycle of the first switch and the second switch, and the conduction time of the first switch and the second switch in each switching cycle, more wind speed gears can be added on the basis of the above-mentioned six wind speed gears to achieve stepless speed regulation.

[0119] In one embodiment of the present invention, a fan control device is also provided. Figure 6 As shown, Figure 6 The fan control device 200 of the embodiment of the present invention is a structural block diagram. The fan includes a multi-gear switch, and the fan control device 200 may specifically include the following acquisition unit 202, processing unit 204 and control unit 206:

[0120] An acquisition unit 202 is used to acquire a target operation signal of a user selecting a target wind speed level;

[0121] The processing unit 204 is used to determine the first switch and the second switch corresponding to the target operation signal from the multi-position switch;

[0122] An acquisition unit 202 is used to acquire a zero-crossing signal of the power grid and determine a target zero-crossing signal;

[0123] The control unit 206 is configured to turn on the first switch, and to alternately turn on the second switch and the first switch at each target zero-crossing signal.

[0124] The fan control device 200 provided in the embodiment of the present invention is used to control the operation of the fan, and the fan includes a multi-position switch.

[0125] Specifically, the control device 200 of the fan provided by the present invention includes an acquisition unit 202, a processing unit 204 and a control unit 206. After the user selects the target wind speed gear of the fan, the acquisition unit 202 can obtain the target operation signal generated by the user selecting the target wind speed gear, and the processing unit 204 further selects the first switch and the second switch corresponding to the target wind speed gear from the multi-gear switch of the fan based on the target operation signal. Further, the control unit 206 turns on the first switch, the acquisition unit 202 obtains the zero-crossing signal of the power grid, the processing unit 204 selects the target zero-crossing signal from the zero-crossing signal of the power grid, and the control unit 206 further turns on the second switch and the first switch alternately at each target zero-crossing signal. In this way, at the zero-crossing signal of the power grid, different gear switches are alternately turned on, that is, different windings are switched on at the zero-crossing point, and the corresponding target wind speed gear can be changed. There is no need to add a speed regulating capacitor, a thyristor and its driving circuit in the fan, and the wind speed gear that the fan can achieve can be increased, which reduces the production cost of the fan and improves the reliability of the fan operation.

[0126] Among them, the first switch is any gear switch among the multi-gear switches, the second switch is any gear switch among the multi-gear switches, the first switch and the second switch can be the same gear switch, and the first switch and the second switch can also be two different gear switches, and no specific limitation is made here.

[0127] Furthermore, the correspondence between the target wind speed level and the first switch and the second switch may be pre-stored in the memory of the fan in the form of a table, which is not specifically limited herein.

[0128] Furthermore, a zero-crossing signal refers to the moment when a signal passes through the zero point, that is, the moment when the amplitude of the signal changes from a positive number to a negative number or from a negative number to a positive number. In electronics, a zero-crossing signal usually refers to the zero-crossing point in an alternating current signal.

[0129] Further, the target zero-crossing signal is selected based on a software algorithm.

[0130] In actual application, the target zero-crossing signal may appear periodically, for example, the target zero-crossing signal is each zero-crossing signal, or the target zero-crossing signal is the second, fourth, sixth, eighth zero-crossing signal, and so on. At this time, the control device switches the first switch and the second switch periodically.

[0131] Furthermore, the target zero-crossing signal may not appear periodically, that is, the control device may not switch the first switch and the second switch periodically, and no specific limitation is made here.

[0132] In summary, the present invention provides a novel fan multi-speed control scheme, which detects the zero-crossing signal of the power grid, and switches different windings to the system by alternately turning on different gear switches near the zero-crossing point, thereby realizing the change of the fan's wind speed gear. The above scheme can save the speed regulating capacitor, thyristor and its driving circuit, and utilize the existing three taps of the AC motor in the fan to control the fan's multi-speed switch based on the zero-crossing signal of the power grid and the software algorithm, so as to realize the fan's 6-speed speed regulation function, and the implementation method is simple, low-cost, and ensures the reliability of the fan operation.

[0133] In actual application, when the first switch is switched to the second switch or the second switch is switched to the first switch, there may be a delay between the disconnection time of the previous switch and the turn-on time of the latter switch. The specific delay duration can be determined according to the phase difference between the voltage signal and the current signal, and no specific limitation is made here.

[0134] In addition, in the actual application process, it is not limited to the above-mentioned switch switching method. In each switch switching cycle, the on-time of the first switch can be equal to the on-time of the second switch, the on-time of the first switch can be greater than the on-time of the second switch, and the on-time of the first switch can be less than the on-time of the second switch, so as to increase the fan's more wind speed levels.

[0135] Furthermore, in actual application, after selecting the first switch and the second switch corresponding to the target wind speed level from the fan's multi-level switch, the control device can also determine whether the first switch and the second switch are the same. If they are the same, no subsequent processing is performed and the selected switch is directly turned on all the time to solve the computing resource problem.

[0136] In some embodiments of the present invention, optionally, the multi-position switch includes multiple position switches corresponding to different wind speeds; the target wind speed position includes multiple wind speed positions corresponding to different wind speeds; wherein, the wind speed of the N+1th wind speed position>the wind speed of the Nth wind speed position, the wind speed of the first switch corresponding to the N+1th wind speed position≥the wind speed of the first switch corresponding to the Nth wind speed position, the wind speed of the second switch corresponding to the N+1th wind speed position≥the wind speed of the second switch corresponding to the Nth wind speed position, and N≥1.

[0137] In some embodiments of the present invention, optionally, the multi-speed switch includes a first gear switch, a second gear switch and a third gear switch corresponding to successively decreasing wind speeds; the target wind speed gear includes a first wind speed gear, a second wind speed gear, a third wind speed gear, a fourth wind speed gear, a fifth wind speed gear and a sixth wind speed gear corresponding to successively increasing wind speeds.

[0138] In some embodiments of the present invention, optionally, when the target wind speed level is the first wind speed level, the first switch and the second switch are both third level switches.

[0139] In some embodiments of the present invention, optionally, when the target wind speed level is the second wind speed level, the first switch is a second level switch, and the second switch is a third level switch.

[0140] In some embodiments of the present invention, optionally, when the target wind speed level is the third wind speed level, the first switch and the second switch are both second level switches.

[0141] In some embodiments of the present invention, optionally, when the target wind speed level is the fourth wind speed level, the first switch is a first level switch, and the second switch is a third level switch.

[0142] In some embodiments of the present invention, optionally, when the target wind speed level is the fifth wind speed level, the first switch is a first level switch, and the second switch is a second level switch.

[0143] In some embodiments of the present invention, optionally, when the target wind speed level is the sixth wind speed level, the first switch and the second switch are both first level switches.

[0144] In one embodiment of the present invention, a fan is also provided. Figure 7 As shown, Figure 7 FIG. 1 is a block diagram of a fan 300 according to an embodiment of the present invention. The fan 300 includes:

[0145] A memory 302, where programs or instructions are stored;

[0146] The processor 304 implements the steps of the fan control method in any of the above embodiments when the processor 304 executes the above program or instruction.

[0147] The fan 300 provided in this embodiment includes a memory 302 and a processor 304. When the program or instructions in the memory 302 are executed by the processor 304, the steps of the fan control method in any of the above embodiments are implemented. Therefore, the fan 300 has all the beneficial effects of the fan control method in any of the above embodiments, which will not be repeated here.

[0148] Specifically, the memory 302 and the processor 304 may be connected via a bus or other means. The processor 304 may include one or more processing units, and the processor 304 may be a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a micro control unit (MCU) and other chips.

[0149] In some embodiments of the present invention, optionally, Figure 8 As shown, the fan 300 further includes an AC motor 306 , a multi-position switch 308 , and a zero-crossing detection circuit 310 .

[0150] The AC motor 306 is connected to the live wire 318 .

[0151] Furthermore, the multi-position switch 308 is connected to the AC motor 306 , the neutral line 320 , and the processor 304 .

[0152] Further, the zero-crossing detection circuit 310 is connected to the processor 304 .

[0153] Furthermore, the multi-position switch 308 is used to control the operation of the AC motor 306 .

[0154] Furthermore, the zero-crossing detection circuit 310 is used to detect the zero-crossing signal of the power grid and transmit the detected zero-crossing signal to the processor 304. The processor 304 then processes and converts the zero-crossing signal and the target operation signal of the target wind speed gear selected by the user to control the multi-speed switch 308 according to a preset program.

[0155] In actual application, the AC motor 306 may be a three-tap motor, which can generate three wind speeds.

[0156] On this basis, if Figure 8 As shown, the multi-position switch 308 may specifically include a first-position switch 312 , a second-position switch 314 , and a third-position switch 316 .

[0157] The wind speed corresponding to the first gear switch 312 is greater than the wind speed corresponding to the second gear switch 314 , and the wind speed corresponding to the second gear switch 314 is greater than the wind speed corresponding to the third gear switch 316 .

[0158] That is, the first gear switch 312 is a high-speed gear switch, and the first gear switch 312 is used to connect to the high-speed tap so that the fan 300 generates high-speed wind; the second gear switch 314 is a medium-speed gear switch, and the second gear switch 314 is used to connect to the medium-speed tap so that the fan 300 generates medium-speed wind; the third gear switch 316 is a low-speed gear switch, and the third gear switch 316 is used to connect to the low-speed tap so that the fan 300 generates low-speed wind.

[0159] In actual application, the first gear switch 312, the second gear switch 314 and the third gear switch 316 can be specifically thyristors, MOS (Metal-Oxide-Semiconductor) tubes or other switching devices. Those skilled in the art can select the specific type of each gear switch according to actual conditions, and no specific restrictions are made here.

[0160] In one embodiment of the present invention, a readable storage medium is also provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the fan control method in any of the above embodiments are implemented.

[0161] The readable storage medium provided by the embodiment of the present invention can implement the steps of the fan control method in any of the above embodiments when the program or instruction stored therein is executed by the processor. Therefore, the readable storage medium has all the beneficial effects of the fan control method in any of the above embodiments, which will not be described in detail here.

[0162] Specifically, the above-mentioned readable storage medium may include any medium capable of storing or transmitting information. Examples of readable storage media include electronic circuits, semiconductor memory devices, read-only memory (ROM), random access memory (RAM), compact disc read-only memory (CD-ROM), flash memory, erasable ROM (EROM), magnetic tape, floppy disk, optical disk, hard disk, optical fiber medium, radio frequency (RF) link, optical data storage device, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0163] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance unless otherwise clearly specified and limited; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0164] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0165] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0166] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling a fan, characterized in that: The fan includes a multi-position switch, and the control method includes: Obtaining a target operation signal of a user selecting a target wind speed level; Determine a first switch and a second switch corresponding to the target operation signal from the multi-position switches; Obtain the zero-crossing signal of the power grid and determine the target zero-crossing signal; The first switch is turned on, and the second switch and the first switch are alternately turned on at each target zero-crossing signal.

2. The fan control method according to claim 1, characterized in that: The multi-position switch includes a plurality of position switches corresponding to different wind speeds; the target wind speed position includes a plurality of wind speed positions corresponding to different wind speeds; Among them, the wind speed of the N+1th wind speed gear is greater than the wind speed of the Nth wind speed gear, the wind speed of the first switch corresponding to the N+1th wind speed gear is greater than or equal to the wind speed of the first switch corresponding to the Nth wind speed gear, the wind speed of the second switch corresponding to the N+1th wind speed gear is greater than or equal to the wind speed of the second switch corresponding to the Nth wind speed gear, and N≥1.

3. The fan control method according to claim 2, characterized in that: The multi-position switch comprises a first position switch, a second position switch and a third position switch, which correspond to successively decreasing wind speeds; The target wind speed gears include a first wind speed gear, a second wind speed gear, a third wind speed gear, a fourth wind speed gear, a fifth wind speed gear and a sixth wind speed gear corresponding to successively increasing wind speeds.

4. The fan control method according to claim 3, characterized in that: When the target wind speed level is the first wind speed level, the first switch and the second switch are both the third level switches.

5. The fan control method according to claim 3, characterized in that: When the target wind speed level is the second wind speed level, the first switch is the second level switch, and the second switch is the third level switch.

6. The fan control method according to claim 3, characterized in that: When the target wind speed level is the third wind speed level, the first switch and the second switch are both the second level switches.

7. The fan control method according to claim 3, characterized in that: When the target wind speed level is the fourth wind speed level, the first switch is the first level switch, and the second switch is the third level switch.

8. The fan control method according to claim 3, characterized in that: When the target wind speed level is the fifth wind speed level, the first switch is the first level switch, and the second switch is the second level switch.

9. The fan control method according to claim 3, characterized in that: When the target wind speed level is the sixth wind speed level, the first switch and the second switch are both the first level switches.

10. A fan control device, characterized in that: The fan includes a multi-position switch, and the control device includes: An acquisition unit, used to acquire a target operation signal of a user selecting a target wind speed level; A processing unit, configured to determine a first switch and a second switch corresponding to the target operation signal from the multi-position switch; The acquisition unit is used to acquire the zero-crossing signal of the power grid and determine the target zero-crossing signal; A control unit is used to turn on the first switch, and to alternately turn on the second switch and the first switch at each target zero-crossing signal.

11. A fan, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the fan control method according to any one of claims 1 to 9 are implemented.

12. The fan according to claim 11, characterized in that Also includes: AC motor, connected to the live wire; A multi-position switch connected to the AC motor, the neutral line and the processor, the multi-position switch being used to control the operation of the AC motor; A zero-crossing detection circuit is connected to the processor, and the zero-crossing detection circuit is used to detect a zero-crossing signal of the power grid.

13. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the fan control method according to any one of claims 1 to 9 are implemented.

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