Voltage stabilization method for motor of range hood

Abstract

The invention belongs to the field of range hoods, and discloses a voltage stabilization method for a motor of a range hood. The method comprises the steps that the controller receives a gear starting instruction, set by a user, of a target range hood gear of the range hood, and a target working voltage value of a motor of the range hood is determined according to the target range hood gear; the motor voltage detection circuit obtains a voltage value of an external power supply of the motor, converts the voltage value into a current working voltage value at two ends of the motor, and outputs the current working voltage value to the controller; and if the current working voltage value is not equal to the target working voltage value, the controller controls the resistance value of the resistance module to be adjusted, so that the current working voltage value is equal to the target working voltage value, and the motor is controlled to operate according to the target range hood gear. According to the range hood, the working voltage of the motor is stabilized by adjusting the resistance value of the external resistance module, and stable performance of the range hood is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly to a method for stabilizing the voltage of a motor of a range hood. Background Art

[0002] At present, a range hood equipped with a traditional AC asynchronous motor does not have a voltage detection and adjustment function, and the gear adjustment of the AC asynchronous motor is achieved by adjusting the voltage to change the speed, and the AC asynchronous motor does not have a stepless speed regulation function. Since the actual civil voltage range of the AC asynchronous motor in the range hood has a large span, voltage fluctuations have a great impact on the performance of the AC asynchronous motor. For example, the higher the voltage, the greater the noise of the AC asynchronous motor; when the voltage is low, the smoking ability of the range hood will also decrease. Therefore, the performance instability caused by the voltage of the AC asynchronous motor will seriously affect the quality of the range hood. Summary of the Invention

[0003] Based on this, it is necessary to provide a method for stabilizing the voltage of a motor of a range hood for the above technical problems.

[0004] In a first aspect, a method for stabilizing the voltage of a motor of a range hood is provided. The range hood is provided with a motor voltage detection circuit, a resistance module and a controller. The motor voltage detection circuit is connected between the output end of the external power supply of the motor and the controller. The resistance module is connected in series between the output end of the external power supply of the motor and the motor and is connected to the controller. The method includes:

[0005] The controller receives a gear opening instruction of a target range hood gear set by a user, and determines a target working voltage value of the motor of the range hood according to the target range hood gear;

[0006] The motor voltage detection circuit obtains the voltage value of the external power supply of the motor, and converts it into the current working voltage value at both ends of the motor and outputs it to the controller;

[0007] If the current working voltage value is not equal to the target working voltage value, the controller controls the resistance value of the resistance module to be adjusted so that the current working voltage value is equal to the target working voltage value, and controls the motor to operate according to the target range hood gear.

[0008] As an optional implementation manner, the determining the target working voltage value of the motor of the range hood according to the target range hood gear includes:

[0009] The controller queries the target working voltage value of the motor corresponding to the target range hood gear in the corresponding relationship between the range hood gear and the working voltage value stored in advance.

[0010] As an alternative embodiment, the controller controls the adjustment of the resistance value of the resistance module so that the current working voltage value is equal to the target working voltage value, including:

[0011] If the current working voltage value is less than the target working voltage value, the controller reduces the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage value, the voltage value of the external power supply, and the motor resistance value stored in advance, so that the current working voltage value is equal to the target working voltage value;

[0012] If the current working voltage value is greater than the target working voltage value, the controller increases the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage, the voltage value of the external power supply, and the motor resistance value, so that the current working voltage value is equal to the target working voltage value.

[0013] As an alternative embodiment, the motor voltage adjustment formula is:

[0014] U AI-Voltage = U / (1 + R / R0)

[0015] Wherein, U AI-Voltage represents the current working voltage value across the motor, U represents the voltage value of the external power supply, R represents the resistance value of the resistance module, and R0 represents the motor resistance.

[0016] As an alternative embodiment, the method further includes:

[0017] If the current working voltage value is equal to the target working voltage value, the controller controls the operation of the range hood according to the target range hood gear.

[0018] As an alternative embodiment, the motor voltage detection circuit includes a current reduction circuit, an electrical signal conversion circuit, and a voltage amplification circuit. The current reduction circuit is respectively connected to the motor, the electrical signal conversion circuit, and the voltage amplification circuit. The voltage amplification circuit is respectively connected to the electrical signal conversion circuit and the controller;

[0019] The current reduction circuit is configured to reduce the strong current of the external power supply of the motor according to a preset ratio to obtain a reduced weak current, and output the weak current to the electrical signal conversion circuit;

[0020] The electrical signal conversion circuit is configured to convert the weak current into a voltage signal and output the voltage signal to the voltage amplification circuit;

[0021] The voltage amplification circuit is used to amplify the voltage signal and output the current working voltage value to the controller.

[0022] As an optional implementation manner, the current reduction circuit includes a first resistor, a current transformer, and a second resistor;

[0023] One end of the first resistor is connected to the live wire of the external power supply, the other end of the first resistor is connected to the first end of the primary coil of the current transformer, the second end of the primary coil of the current transformer is connected to the neutral wire of the external power supply, the first end of the secondary coil of the current transformer is respectively connected to one end of the second resistor and the voltage amplification circuit, and the second end of the secondary coil of the current transformer is respectively connected to the other end of the second resistor, the electrical signal conversion circuit, and the voltage amplification circuit and grounded.

[0024] As an optional implementation manner, the electrical signal conversion circuit includes a second external power supply, a third resistor, a fourth resistor, and a first operational amplifier;

[0025] The second external power supply is connected to one end of the third resistor, the positive power supply terminal of the first operational amplifier, and the voltage amplification circuit. The other end of the third resistor is respectively connected to one end of the fourth resistor and the non-inverting input terminal of the first operational amplifier. The other end of the fourth resistor is respectively connected to the negative power supply terminal of the first operational amplifier, the current reduction circuit, and the voltage amplification circuit and grounded. The inverting input terminal of the first operational amplifier is respectively connected to the output terminal of the first operational amplifier and the voltage amplification circuit.

[0026] As an optional implementation manner, the voltage amplification circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second operational amplifier, and a capacitor;

[0027] One end of the fifth resistor is connected to the electrical signal conversion circuit. The other end of the fifth resistor is respectively connected to one end of the sixth resistor and the non-inverting input terminal of the second operational amplifier. The other end of the sixth resistor is respectively connected to the current reduction circuit, the electrical signal conversion circuit, the negative power supply terminal of the second operational amplifier, and the negative electrode of the capacitor and grounded. The inverting input terminal of the second operational amplifier is respectively connected to one end of the seventh resistor and one end of the eighth resistor. The other end of the seventh resistor is connected to the current reduction circuit. The other end of the eighth resistor is respectively connected to the output terminal of the second operational amplifier and one end of the ninth resistor. The positive power supply terminal of the second operational amplifier is connected to the electrical signal conversion circuit. The other end of the ninth resistor is respectively connected to the positive electrode of the capacitor and the controller.

[0028] As an alternative embodiment, the formula for converting to the current operating voltage value at both ends of the motor is:

[0029] U AI-Voltage =[U VCC *R8 / (R5+R8)]-Volt1]*R9 / R7

[0030] Wherein, U AI-Voltage represents the current operating voltage value, U VCC represents the voltage value of the second external power supply, Volt1 represents the voltage value output by the current transformer, R8 represents the resistance value of the eighth resistor, R5 represents the resistance value of the fifth resistor, R9 represents the resistance value of the ninth resistor, and R7 represents the resistance value of the seventh resistor.

[0031] The present application provides a method for stabilizing the voltage of the motor of an oil fume machine. The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects: The controller receives a gear opening instruction of the target fume machine gear set by the user, and determines the target operating voltage value of the motor of the oil fume machine according to the target fume machine gear; the motor voltage detection circuit obtains the voltage value of the external power supply of the motor, and converts it into the current operating voltage value at both ends of the motor and outputs it to the controller; if the current operating voltage value is not equal to the target operating voltage value, the controller controls the resistance value of the resistance module to be adjusted so that the current operating voltage value is equal to the target operating voltage value, and controls the motor to operate according to the target fume machine gear. In this way, after receiving the fume machine gear set by the user, by comparing the current operating voltage value and the target operating voltage value, it is judged whether the voltage value of the external power supply fluctuates. If so, the resistance module connected in series with the motor is adjusted. By adjusting the resistance value of the resistance module, the magnitude of the current operating voltage value of the motor is adjusted so that the current operating voltage value is equal to the target operating voltage value. Thus, when adapting to the external voltage fluctuation, the resistance value of the resistance module is automatically adjusted to ensure that the current operating voltage value of the motor is stable. By adjusting the external resistance, the motor voltage is adjusted steplessly, the motor is adjusted steplessly, and the performance of the oil fume machine is ensured to be stable, and the quality of the range hood is improved.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 Schematic diagram of a motor voltage stabilization system for a range hood provided by an embodiment of the present application;

[0035] Figure 2 Flowchart of a motor voltage stabilization method for a range hood provided by an embodiment of the present application;

[0036] Figure 3 Schematic diagram of an air duct cabinet of a range hood provided by an embodiment of the present application;

[0037] Figure 4 Schematic diagram of a resistance module and a motor provided by an embodiment of the present application;

[0038] Figure 5 Schematic diagram of a motor voltage detection circuit provided by an embodiment of the present application. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] The motor voltage stabilization method for a range hood provided by an embodiment of the present application can be applied to the motor voltage stabilization system of the range hood. As Figure 1 shown, the motor voltage stabilization system of the range hood includes a controller 101, a motor voltage detection circuit 102, a motor 103 and a resistance module 104. The controller 101 is respectively connected to the motor voltage detection circuit 102, the motor 103 and the resistance module 104. The motor voltage detection circuit 102 is connected to the motor 103, and the motor 103 is connected to the resistance module 104.

[0041] The controller 101 is configured to receive a gear opening instruction of a target range hood gear set by a user, and determine a target working voltage value of the motor 103 of the range hood according to the target range hood gear. The controller 101 receives the current working voltage value at both ends of the motor 103 sent by the motor voltage detection circuit 102. If the current working voltage value is not equal to the target working voltage value, the controller 101 controls the resistance value of the resistance module 104 to be adjusted so that the current working voltage value is equal to the target working voltage value, and controls the motor 103 to operate according to the target range hood gear.

[0042] The motor voltage detection circuit 102 is configured to obtain the voltage value of the external power supply of the motor 103 and convert it into the current working voltage value at both ends of the motor 103 for output to the controller 101.

[0043] The motor 103 is configured to operate based on the current working voltage.

[0044] The resistance module 104 is used to receive the instruction of the controller 101 to adjust its own resistance value.

[0045] Next, in combination with specific implementation manners, a method for stabilizing the voltage of the motor of an oil fume machine provided in an embodiment of the present application will be described in detail. Figure 2 It is a flowchart of a method for stabilizing the voltage of the motor of an oil fume machine provided in an embodiment of the present application, as Figure 2 shown, the specific steps are as follows:

[0046] Step 201, the controller receives the gear opening instruction of the target oil fume machine gear set by the user, and determines the target working voltage value of the motor of the oil fume machine according to the target oil fume machine gear.

[0047] In implementation, the traditional oil fume machine equipped with an AC asynchronous motor is not provided with a voltage detection and adjustment function, and the gear adjustment of the AC asynchronous motor is realized by adjusting the speed through voltage. The AC asynchronous motor does not have a stepless speed regulation function. Since the actual civil voltage range of the AC asynchronous motor in the oil fume machine has a large span, the voltage fluctuation has a great influence on the performance of the AC asynchronous motor. For example, the higher the voltage, the greater the noise of the AC asynchronous motor; when the voltage is low, the oil suction capacity of the oil fume machine will also decrease. Therefore, the performance instability caused by the voltage of the AC asynchronous motor will seriously affect the quality of the oil fume machine. Then, the oil suction capacity of the oil fume machine can be stabilized by stabilizing the actual working voltage value of the motor of the oil fume machine. To stabilize the actual working voltage value of the motor of the oil fume machine, it is necessary to first obtain the target oil fume machine gear, and determine the target working motor value corresponding to the motor of the oil fume machine according to the target oil fume machine gear. Subsequently, the actual input voltage value of the motor can be adjusted according to the target working voltage value of the motor. Therefore, the controller receives the gear opening instruction of the target oil fume machine gear set by the user, and determines the target working voltage value of the motor of the oil fume machine according to the target oil fume machine gear.

[0048] As Figure 3 shown, it includes the oil fume machine cabinet, the cabinet drive motor and the motor gear wiring port of the oil fume machine. Through the motor gear wiring port as the power supply interface for the cabinet drive motor, different voltage values are provided to the motor gear wiring port, so that the rotation speed of the cabinet drive motor is different, and the corresponding oil fume machine gears are different.

[0049] Specifically, the specific steps for executing the step of determining the target working voltage value of the motor of the oil fume machine according to the target oil fume machine gear are: in the corresponding relationship between the oil fume machine gear and the working voltage value stored in advance, the controller queries the target working voltage value of the motor corresponding to the target oil fume machine gear.

[0050] In implementation, technicians pre-determine the working voltage values of the motor of the range hood for different range hood speed settings, so that when the motor operates at the working voltage values, the range hood speed for sucking oil fumes is ensured. The controller stores the correspondence between the range hood speed and the working voltage values. After receiving the target range hood speed set by the user, based on the pre-stored correspondence between the range hood speed and the working voltage values, it queries the target working voltage value of the motor corresponding to the target range hood speed. In this way, according to the target range hood speed, the target working voltage value of the motor can be queried from the pre-stored correspondence between the range hood speed and the working voltage values.

[0051] Step 202, the motor voltage detection circuit obtains the voltage value of the external power supply of the motor and converts it into the current working voltage value across the motor and outputs it to the controller.

[0052] In implementation, to stabilize the actual working voltage of the motor of the range hood, after determining the target working voltage value of the motor, it is also necessary to obtain the current working voltage value of the motor. In subsequent steps, the current working voltage value can be adjusted according to the target working voltage value so that the current working voltage value is equal to the target working voltage value. In this application, by designing a motor voltage detection circuit, the current working voltage value of the motor of the range hood is monitored in real time through the motor voltage detection circuit. The controller can also obtain the voltage value of the external power supply of the motor. Subsequently, when the voltage value of the external power supply fluctuates unstably, the current working voltage value of the motor is adjusted by the resistance value of the resistance module connected in series with the motor so that the current working value is stabilized at the target working voltage value. Therefore, the voltage value of the external power supply of the motor can be obtained through the motor voltage detection circuit and converted into the current working voltage value across the motor and output to the controller. In this way, the controller obtains the current working voltage value across the motor.

[0053] Furthermore, the motor voltage detection circuit detects the current working voltage value of the motor in real time and sends the detected current working voltage value to the controller. The controller selects the corresponding range hood speed based on the above-mentioned correspondence between the range hood speed and the working voltage values and turns on the corresponding range hood speed, and the range hood speeds that do not meet the voltage range remain closed.

[0054] Step 203, if the current working voltage value is not equal to the target working voltage value, the controller controls the resistance value of the resistance module to be adjusted so that the current working voltage value is equal to the target working voltage value and controls the motor to operate according to the target range hood speed.

[0055] In implementation, the voltage value of the external power supply of the motor of the range hood sometimes fluctuates. Then, when the voltage value of the external power supply fluctuates, it will affect the operating speed of the motor of the range hood and does not conform to the range hood gear that is desired to be correspondingly turned on. Then, a resistance module can be set and the resistance module is connected in series with the motor. When the voltage value of the external power supply fluctuates, by adjusting the resistance value of the resistance module, the voltage value of the resistance module can be increased or decreased, so as to realize the decrease or increase of the current working voltage value of the motor. Therefore, the current working voltage value is compared with the target working voltage value. If the current working voltage value is not equal to the target working voltage value, it means that the voltage value of the external power supply of the motor fluctuates. Then, according to the current working voltage value, the voltage value of the external power supply and the target working voltage value, the controller controls the resistance value of the resistance module connected in series with the motor to be adjusted so that the current working voltage value is equal to the target working voltage value, and controls the motor to operate according to the target range hood gear. For example, the control system drives the resistance module to adjust the resistance value according to the difference between the current working voltage value and the target working voltage value. When the current working voltage value is too low, the series resistance of the motor is adjusted smaller, that is, the resistance value of the resistance module is adjusted smaller, and the current working voltage value of the motor is increased to the standard value; when the current working voltage value is too high, the external series resistance of the motor is increased, that is, the resistance value of the resistance module is adjusted larger, and the current working voltage value is decreased to the standard value. The voltage of the motor can be steplessly adjusted by adjusting the external resistance within the set voltage range, and the stepless gear shifting of the motor can be realized. Thus, the current working voltage value is equal to the target working voltage value, and the motor is controlled to operate according to the target range hood gear. In this way, for the range hood to set the range hood gear, only the target working voltage value of the motor needs to be set, and the controller will automatically control and adjust the resistance value of the resistance module to realize the operation of the range hood gear. Among them, the target working voltage value can be set as a voltage value range according to the actual situation, such as 190V-192V. As Figure 4 shown, the motor and the resistance module are connected in series. By adjusting the resistance value of the resistance module, when the voltage value of the external power supply fluctuates, the current working voltage value of the motor is stabilized.

[0056] Further, the specific process of performing step 203 is as follows:

[0057] Step 1, if the current working voltage value is less than the target working voltage value, the controller reduces the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage value, the voltage value of the external power supply and the pre-stored motor resistance value, so that the current working voltage value is equal to the target working voltage value.

[0058] In implementation, the current working voltage value is compared with the target working voltage value. If the current working voltage value is less than the target working voltage value, the controller controls the resistance value of the resistance module connected in series with the motor to be reduced, that is, the resistance value of the resistance module connected in series with the motor is reduced, then the current working voltage value of the motor will increase, so that the current working voltage value is equal to the target working voltage value. The controller can reduce the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage value, the voltage value of the external power supply, and the pre-stored motor resistance value, so that the current working voltage value is equal to the target working voltage value.

[0059] As an alternative implementation, the motor voltage adjustment formula is:

[0060] U AI-Voltage = U / (1 + R / R0)

[0061] Wherein, U AI-Voltage represents the current working voltage value across the motor, U represents the voltage value of the external power supply, R represents the resistance value of the resistance module, and R0 represents the motor resistance.

[0062] In this way, through the motor voltage adjustment formula, by adjusting the size of the resistance value of the series resistance module, when the voltage value of the external power supply fluctuates, the resistance value of the resistance module can be adjusted to ensure the stability of the current working voltage value, so as to ensure that the motor still has a stable adjustment ability when the external standard voltage is at the lower limit value.

[0063] Step 2, if the current working voltage value is greater than the target working voltage value, the controller increases the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage, the voltage value of the external power supply, and the motor resistance value, so that the current working voltage value is equal to the target working voltage value.

[0064] In implementation, the current working voltage value is compared with the target working voltage value. If the current working voltage value is greater than the target working voltage value, the controller controls the resistance value of the resistance module connected in series with the motor to be increased, that is, the resistance value of the resistance module connected in series with the motor is increased, then the current working voltage value of the motor will decrease, so that the current working voltage value is equal to the target working voltage value. The controller can increase the resistance value of the resistance module based on the motor voltage adjustment formula, the current working voltage, the voltage value of the external power supply, and the motor resistance value, so that the current working voltage value is equal to the target working voltage value.

[0065] Furthermore, if the current working voltage value is equal to the target working voltage value, the controller controls the operation of the range hood according to the target range hood gear.

[0066] In implementation, the current working voltage value is compared with the target working voltage value. If the current working voltage value is equal to the target working voltage value, it indicates that the rotational speed of the motor corresponding to the current working voltage value of the motor at this time meets the smoking requirements corresponding to the range hood gear. There is no need to adjust the resistance value of the resistance module again, nor to adjust the current working voltage value of the motor. Therefore, if the current working voltage value is equal to the target working voltage value, the controller controls the operation of the range hood according to the target range hood gear.

[0067] Further, as Figure 5 shown, the motor voltage detection circuit includes a current reduction circuit 501, an electrical signal conversion circuit 502, and a voltage amplification circuit 503. The current reduction circuit 501 is respectively connected to the motor, the electrical signal conversion circuit 502, and the voltage amplification circuit 503. The voltage amplification circuit 503 is respectively connected to the electrical signal conversion circuit 502 and the controller.

[0068] The current reduction circuit 501 is used to reduce the strong current of the external power supply of the motor according to a preset ratio to obtain a reduced weak current, and output the weak current to the electrical signal conversion circuit 502. Among them, the preset ratio can be 100 times.

[0069] The electrical signal conversion circuit 502 is used to convert the weak current into a voltage signal and output the voltage signal to the voltage amplification circuit 503.

[0070] The voltage amplification circuit 503 is used to amplify the voltage signal and output the current working voltage value to the controller. Among them, after the voltage amplification circuit 503 amplifies the voltage signal, the output port is connected to the I / O conversion port of the controller. In this way, the controller can obtain the voltage signal through the input / output conversion port. The voltage signal has the same frequency and phase as the motor voltage, and the amplitude is reduced according to a ratio, which is the current working voltage value.

[0071] As an optional implementation manner, the current reduction circuit 501 includes a first resistor R1, a current transformer T1, and a second resistor R2.

[0072] One end of the first resistor R1 is connected to the live wire L of the external power supply. The other end of the first resistor R1 is connected to the first end of the primary coil of the current transformer T1. The second end of the primary coil of the current transformer T1 is connected to the neutral wire N of the external power supply. The first end of the secondary coil of the current transformer T1 is respectively connected to one end of the second resistor R2 and the voltage amplification circuit 503. The second end of the secondary coil of the current transformer T1 is respectively connected to the other end of the second resistor R2, the electrical signal conversion circuit 502, and the voltage amplification circuit 503 and is grounded.

[0073] As an optional implementation manner, the electrical signal conversion circuit 502 includes a second external power supply VCC, a third resistor R3, a fourth resistor R4, and a first operational amplifier U1A.

[0074] The second external power supply VCC is connected to one end of the third resistor R3, the positive power supply terminal of the first operational amplifier U1A, and the voltage amplification circuit 503. The other end of the third resistor R3 is respectively connected to one end of the fourth resistor R4 and the non-inverting input terminal of the first operational amplifier U1A. The other end of the fourth resistor R4 is respectively connected to the negative power supply terminal of the first operational amplifier U1A, the current reduction circuit 501, and the voltage amplification circuit 503 and grounded. The inverting input terminal of the first operational amplifier U1A is respectively connected to the output terminal of the first operational amplifier U1A and the voltage amplification circuit 503. Among them, the second external power supply VCC can be 5V, and the second external power supply VCC also provides the working power supply for the controller at the same time.

[0075] As an alternative implementation, the voltage amplification circuit 503 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second operational amplifier U1B, and a capacitor C1.

[0076] One end of the fifth resistor R5 is connected to the electrical signal conversion circuit 502. The other end of the fifth resistor R5 is respectively connected to one end of the sixth resistor R6 and the non-inverting input terminal of the second operational amplifier U1B. The other end of the sixth resistor R6 is respectively connected to the current reduction circuit 501, the electrical signal conversion circuit 502, the negative power supply terminal of the second operational amplifier U1B, and the negative electrode of the capacitor C1 and grounded. The inverting input terminal of the second operational amplifier U1B is respectively connected to one end of the seventh resistor R7 and one end of the eighth resistor R8. The other end of the seventh resistor R7 is connected to the current reduction circuit 501. The other end of the eighth resistor R8 is respectively connected to the output terminal of the second operational amplifier U1B and one end of the ninth resistor R9. The positive power supply terminal of the second operational amplifier U1B is connected to the electrical signal conversion circuit 502. The other end of the ninth resistor R9 is respectively connected to the positive electrode of the capacitor C1 and the controller.

[0077] Furthermore, the formula for converting to the current working voltage value at both ends of the motor is:

[0078] U AI-Voltage =[U VCC *R8 / (R5 + R8)] - Volt1]*R9 / R7

[0079] Wherein, U AI-Voltage represents the current working voltage value, U VCC represents the voltage value of the second external power supply, Volt1 represents the voltage value output by the current transformer, R8 represents the resistance value of the eighth resistor, R5 represents the resistance value of the fifth resistor, R9 represents the resistance value of the ninth resistor, and R7 represents the resistance value of the seventh resistor.

[0080] An embodiment of the present application provides a method for stabilizing the voltage of a motor of a range hood. After receiving the range hood gear set by the user, by comparing the current working voltage value with the target working voltage value, it is determined whether the voltage value of the external power supply fluctuates. If so, the resistance module connected in series with the motor is adjusted. By adjusting the resistance value of the resistance module, the magnitude of the current working voltage value of the motor is adjusted so that the current working voltage value is equal to the target working voltage value. Thus, when adapting to the external voltage fluctuation, the resistance value of the resistance module is automatically adjusted to ensure that the current working voltage value of the motor is stable. By adjusting the external resistance, the motor voltage is steplessly adjusted, the motor steplessly changes gears, the performance of the range hood is ensured to be stable, and the quality of the range hood is improved.

[0081] It should be understood that although Figure 2 the steps in the flowchart of Figure 2 are shown in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,

[0082] It can be understood that the same / similar parts among the various embodiments of the above methods in this specification can be referred to each other. Each embodiment focuses on the differences from other embodiments. For the relevant parts, refer to the descriptions of other method embodiments.

[0083] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0084] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0085] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference can be made to the relevant part of the method embodiment for the relevant content.

[0086] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0087] The above-described embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. A method for stabilizing voltage of a range hood motor, characterized in that: The range hood is provided with a motor voltage detection circuit, a resistance module and a controller, the motor voltage detection circuit is connected between the output end of the external power supply of the motor and the controller, the resistance module is connected in series between the output end of the external power supply of the motor and the motor and the resistance module is connected to the controller, and the method includes: The controller receives a gear-opening instruction of a target hood gear of the range hood set by a user, and determines a target operating voltage value of the motor of the range hood according to the target hood gear; The motor voltage detection circuit obtains the voltage value of the external power supply of the motor, converts it into the current working voltage value at both ends of the motor and outputs it to the controller; If the current operating voltage value is not equal to the target operating voltage value, the controller controls the resistance value of the resistance module to adjust so that the current operating voltage value is equal to the target operating voltage value, and controls the motor to operate according to the target range hood gear position.

2. The method according to claim 1, characterized in that The step of determining a target operating voltage value of the motor of the range hood according to the target range hood gear position includes: In the pre-stored correspondence between the range hood gear position and the operating voltage value, the controller queries the target operating voltage value of the motor corresponding to the target range hood gear position.

3. The method according to claim 1, characterized in that The controller controls the resistance value of the resistance module to adjust so that the current operating voltage value is equal to the target operating voltage value, including: If the current operating voltage value is less than the target operating voltage value, the controller reduces the resistance value of the resistance module based on the motor voltage adjustment formula, the current operating voltage value, the voltage value of the external power supply and the pre-stored motor resistance value, so that the current operating voltage value is equal to the target operating voltage value; If the current operating voltage value is greater than the target operating voltage value, the controller increases the resistance value of the resistance module based on the motor voltage adjustment formula, the current operating voltage, the voltage value of the external power supply and the motor resistance value, so that the current operating voltage value is equal to the target operating voltage value.

4. The method according to claim 3, characterized in that The motor voltage adjustment formula is: U AI-Voltage =U / (1+R / R0) Among them, U AI-Voltage It indicates the current working voltage value at both ends of the motor, U indicates the voltage value of the external power supply, R indicates the resistance value of the resistance module, and R0 indicates the motor resistance.

5. The method according to claim 1, characterized in that The method further comprises: If the current operating voltage value is equal to the target operating voltage value, the controller controls the range hood to operate according to the target range hood gear position.

6. The method according to claim 1, characterized in that The motor voltage detection circuit includes a current reduction circuit, an electrical signal conversion circuit and a voltage amplification circuit, wherein the current reduction circuit is respectively connected to the motor, the electrical signal conversion circuit and the voltage amplification circuit, and the voltage amplification circuit is respectively connected to the electrical signal conversion circuit and the controller; The current reduction circuit is used to reduce the strong current of the external power supply of the motor according to a preset ratio to obtain a reduced weak current, and output the weak current to the electrical signal conversion circuit; The electrical signal conversion circuit is used to convert the weak current into a voltage signal and output the voltage signal to the voltage amplification circuit; The voltage amplifier circuit is used to amplify the voltage signal and output the current working voltage value to the controller.

7. The method according to claim 6, characterized in that The current reduction circuit includes a first resistor, a current transformer, and a second resistor; One end of the first resistor is connected to the live wire of the external power supply, the other end of the first resistor is connected to the first end of the primary coil of the current transformer, the second end of the primary coil of the current transformer is connected to the neutral wire of the external power supply, the first end of the secondary coil of the current transformer is respectively connected to one end of the second resistor and the voltage amplification circuit, and the second end of the secondary coil of the current transformer is respectively connected to the other end of the second resistor, the electrical signal conversion circuit and the voltage amplification circuit and is grounded.

8. The method according to claim 7, characterized in that The electrical signal conversion circuit includes a second external power supply, a third resistor, a fourth resistor and a first operational amplifier; The second external power supply is connected to one end of the third resistor, the positive power supply terminal of the first operational amplifier and the voltage amplification circuit, the other end of the third resistor is respectively connected to one end of the fourth resistor and the non-inverting input terminal of the first operational amplifier, the other end of the fourth resistor is respectively connected to the negative power supply terminal of the first operational amplifier, the current reduction circuit and the voltage amplification circuit and grounded, and the inverting input terminal of the first operational amplifier is respectively connected to the output terminal of the first operational amplifier and the voltage amplification circuit.

9. The method according to claim 8, characterized in that The voltage amplification circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second operational amplifier and a capacitor; One end of the fifth resistor is connected to the electrical signal conversion circuit, the other end of the fifth resistor is respectively connected to one end of the sixth resistor and the in-phase input terminal of the second operational amplifier, the other end of the sixth resistor is respectively connected to the current reduction circuit, the electrical signal conversion circuit, the negative power supply terminal of the second operational amplifier and the negative electrode of the capacitor and grounded, the inverting input terminal of the second operational amplifier is respectively connected to one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is connected to the current reduction circuit, the other end of the eighth resistor is respectively connected to the output terminal of the second operational amplifier and one end of the ninth resistor, the positive power supply terminal of the second operational amplifier is connected to the electrical signal conversion circuit, and the other end of the ninth resistor is respectively connected to the positive electrode of the capacitor and the controller.

10. The method according to claim 9, characterized in that The formula for converting the current working voltage value at both ends of the motor is: And AI-Voltage =[U VCC *R8 / (R5+R8)]-Volt1]*R9 / R7 Among them, U AI-Voltage Indicates the current working voltage value, U VCC represents the voltage value of the second external power supply, Volt1 represents the voltage value output by the current transformer, R8 represents the resistance value of the eighth resistor, R5 represents the resistance value of the fifth resistor, R9 represents the resistance value of the ninth resistor, and R7 represents the resistance value of the seventh resistor.

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