Gear adjustment circuit of household electrical appliance and household electrical appliance

Abstract

The present application relates to a gear adjustment circuit of a household appliance and the household appliance, wherein the gear adjustment circuit includes a signal processing circuit, a sampling circuit and a processing device. In the above-mentioned gear adjustment circuit, when the motor device of the household appliance works at the gear set by the user, an induced voltage is generated, and the induced voltage is processed by the signal processing circuit to obtain an induced electrical signal, and then the sampling circuit samples the induced electrical signal to obtain sampled voltage data and sends it to the processing device, and the processing device compares and analyzes the sampled voltage data and the preset voltage value range corresponding to the current gear of the motor device, thereby outputting a corresponding control signal to adjust the current gear of the motor device, thereby realizing the purpose of monitoring the load change of the motor device of the household appliance according to the induced voltage, thereby correspondingly adjusting the current gear of the motor device to improve the smoke exhaust performance.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen utensils, and in particular to a gear adjustment circuit of a household appliance and the household appliance. Background Art

[0002] In current urban life, most smoke exhaust ducts in high-rise residential buildings are public flues. During the peak cooking times in the morning, noon and evening, most families turn on their own range hoods to exhaust smoke, which causes a sharp increase in the exhaust pressure of public flues.

[0003] When using the range hood for smoke exhaust, the user sets the wind speed of the range hood through the gear button. When most families in a high-rise residential building turn on the range hood, the exhaust pressure of the public flue increases, the load of the range hood increases, and the user cannot check the pressure conditions in the public flue to adjust the gear of the range hood in a timely and accurate manner to improve the smoke exhaust performance of the range hood, resulting in poor smoke exhaust effect of the range hood. Summary of the invention

[0004] Based on this, it is necessary to provide a gear adjustment circuit and a household appliance that can improve the smoke exhaust effect of the range hood to address the problem of poor smoke exhaust effect of the range hood.

[0005] A gear adjustment circuit for household appliances, the gear adjustment circuit comprising a signal processing circuit, a sampling circuit and a processing device; the signal processing circuit is used to connect to a motor device of the household appliance, the sampling circuit is connected to the signal processing circuit and the processing device, and the processing device is used to connect to the motor device; the signal processing circuit is used to obtain an induced voltage generated by the motor device, and perform signal processing to obtain an induced electrical signal; the sampling circuit is used to perform voltage sampling on the induced electrical signal, obtain sampled voltage data and output it to the processing device; the processing device is used to output a corresponding control signal to adjust the current gear of the motor device according to the sampled voltage data and a preset voltage value range corresponding to the current gear of the motor device.

[0006] The above-mentioned gear adjustment circuit generates an induced voltage when the motor device of the household appliance operates at the gear set by the user. The signal processing circuit processes the induced voltage to obtain an induced electrical signal, and then the sampling circuit samples the voltage of the induced electrical signal to obtain sampled voltage data and sends it to the processing device. The processing device compares and analyzes the sampled voltage data and the preset voltage value range corresponding to the current gear of the motor device, and outputs a corresponding control signal to adjust the current gear of the motor device, thereby realizing the purpose of monitoring the load change of the motor device of the household appliance according to the induced voltage, thereby adjusting the current gear of the motor device accordingly, so as to improve the smoke exhaust performance.

[0007] In one embodiment, the signal processing circuit includes a first rectifier component and a first filter component, one end of the first rectifier component is used to connect to the motor device, the other end of the first rectifier component is connected to one end of the first filter component and the sampling circuit, and the other end of the first filter component is used to connect to the motor device. By setting the first rectifier component and the first filter component, corresponding rectification and filtering processing can be performed, so that the induced electrical signal output to the sampling circuit is stable and smooth, ensuring that the sampling circuit can sample accurate sampling voltage data.

[0008] In one embodiment, the first rectifier component includes a first resistor component and a first diode component, and the first filter component includes a second resistor component and a first capacitor component; one end of the first resistor component is used to connect to the motor device, the other end of the first resistor component is connected to the input end of the first diode component, the output end of the first diode component is connected to the sampling circuit, one end of the second resistor component and one end of the first capacitor component, and the other end of the second resistor component and the other end of the first capacitor component are both used to connect to the motor device.

[0009] In one embodiment, the sampling circuit includes a first voltage dividing component and a second voltage dividing component, one end of the first voltage dividing component is connected to the signal processing circuit, the other end of the first voltage dividing component is connected to one end of the second voltage dividing component and the processing device, and the other end of the second voltage dividing component is grounded. By providing the first voltage dividing component and the second voltage dividing component, voltage division can be performed to prevent the sampling voltage data output to the processing device from being too high and damaging the processing device.

[0010] In one embodiment, the sampling circuit further includes a second capacitor component, one end of the second capacitor component is connected to one end of the first voltage divider component, and the other end of the second capacitor component is connected to the other end of the second voltage divider component.

[0011] In one embodiment, the sampling circuit further includes a second diode component, an input end of the second diode component is connected to one end of the first voltage divider component, and an output end of the second diode component is used to connect to an input power supply.

[0012] A household appliance comprises a motor device and the above-mentioned gear adjustment circuit.

[0013] In the above-mentioned household appliance, when the motor device of the household appliance works at the gear position set by the user, an induced voltage is generated. The signal processing circuit performs signal processing on the induced voltage to obtain an induced electrical signal, and then the sampling circuit performs voltage sampling on the induced electrical signal to obtain sampled voltage data and sends it to the processing device. The processing device performs comparative analysis based on the sampled voltage data and the preset voltage value range corresponding to the current gear position of the motor device, and outputs a corresponding control signal to adjust the current gear position of the motor device, thereby realizing the purpose of monitoring the load change of the motor device of the household appliance according to the induced voltage, thereby correspondingly adjusting the current gear position of the motor device to improve the smoke exhaust performance.

[0014] In one embodiment, the motor device includes a motor and two or more windings, each winding is wound on a metal rod, and each winding is connected in series to the motor.

[0015] In one embodiment, one end of the signal processing circuit is connected to one end of the metal rod, and the other end of the signal processing circuit is connected to the other end of the metal rod.

[0016] In one embodiment, the metal rod includes a head end and a tail end, each winding is wound between the head end and the tail end of the metal rod, one end of the signal processing circuit is connected to the head end of the metal rod, and the other end of the signal processing circuit is connected to the tail end of the metal rod.

[0017] In one embodiment, the household appliance is a range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the description of the embodiments or the conventional technology are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of a circuit system framework for adjusting the gear position of a household appliance in an embodiment;

[0020] Figure 2 A schematic diagram of the circuit principle of a signal processing circuit and a motor device in one embodiment;

[0021] Figure 3 FIG. 4 is a schematic diagram of a circuit principle of a sampling circuit in an embodiment. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0025] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects. When used herein, the singular forms "a", "an" and "the" may also include plural forms, unless the context clearly indicates otherwise.

[0026] In one embodiment, Figure 1 As shown, a gear adjustment circuit for household appliances is provided, and the gear adjustment circuit includes a signal processing circuit 100, a sampling circuit 200, and a processing device 300. The signal processing circuit 100 is used to connect the motor device of the household appliance, the sampling circuit 200 connects the signal processing circuit 100 and the processing device 300, and the processing device 300 is used to connect the motor device; the signal processing circuit 100 is used to obtain the induced voltage generated by the motor device, and perform signal processing to obtain the induced electrical signal; the sampling circuit 200 is used to perform voltage sampling on the induced electrical signal, obtain sampled voltage data, and output it to the processing device 300; the processing device 300 is used to output a corresponding control signal to adjust the current gear of the motor device according to the sampled voltage data and a preset voltage value range corresponding to the current gear of the motor device.

[0027] Among them, the motor device of the household appliance is used to drive the blades to rotate. For example, the household appliance is a range hood, and the range hood has a motor device. After the user sets the gear of the motor device, the motor device of the range hood drives the blades to rotate according to the set gear to achieve smoke exhaust. It can be understood that when the motor device drives the blades to rotate according to the set gear to absorb oil smoke and discharge it into the public flue of the high-rise residential building, if the gas pressure in the public flue increases, the motor device will need to output a larger load to drive the blades to operate normally, that is, the load of the motor device will change with the pressure in the public flue. Furthermore, generally, the existing motor device has multiple windings inside, and these windings are all wound on a metal rod (such as an iron core). According to the different gears set by the user, a corresponding number of windings will be energized, that is, each winding is equivalent to a gear. When only one winding is energized, it means that the motor device is currently in a high gear. When two windings are energized, it means that the motor device is currently in a medium gear, and so on.

[0028] When the winding wound on the metal rod is energized (generally the existing AC mains), according to the current induction principle, the metal rod will generate an induced current or induced voltage at this time, and the signal processing circuit 100 is connected to the metal rod to obtain the induced voltage. When the motor device drives the blades to rotate according to the set gear, the signal processing circuit 100 can obtain the induced voltage generated on the metal rod. The induced voltage generated on the metal rod has a relatively low voltage value. After signal processing by the signal processing circuit 100, it can be converted into an induced electrical signal. For example, a transformer is provided in the signal processing circuit 100, and the induced voltage is converted into an induced electrical signal with a relatively high voltage value by boosting the transformer. Then the signal processing circuit 100 outputs the induced electrical signal to the sampling circuit 200. In other embodiments, the signal processing circuit 100 may be provided with a rectifier and filter circuit, that is, the induced voltage generated on the metal rod is rectified and filtered to obtain the induced electrical signal. The sampling circuit 200 samples the induced electrical signal, obtains the sampled voltage data and outputs it to the processing device 300. The processing device 300 may be an MCU (microprocessor) or a control chip, etc. The sampling circuit 200 is connected to the I / O interface of the processing device 300 to send the sampled voltage data to the processing device 300. Since the processing device 300 is connected to the motor device, the gear information of the motor device set by the user can be obtained. For example, the user currently sets the motor device to the middle gear, and the preset voltage value range corresponding to the current middle gear is 210-230V. The processing device 300 compares the sampled voltage data with the preset voltage value range. A comparison is performed to determine whether the sampled voltage data falls within the preset voltage value range. If it falls within the preset voltage value range, a corresponding control signal is output to maintain the current gear of the motor device. When the sampled voltage data is lower than the minimum value of the preset voltage value range, it indicates that the load of the motor device has decreased at this time, and the processing device 300 will output a corresponding control signal to lower the current gear of the motor device (for example, to a low gear). When the sampled voltage data is higher than the preset voltage value range, it indicates that the load of the motor device has increased at this time, and the processing device 300 will output a corresponding control signal to increase the current gear of the motor device (for example, to a high gear).

[0029] Further, the processing device 300 may be connected to each relay, each relay corresponding to the gear position of the motor device, for example, the motor device includes three gear positions: high, medium and low, and three windings are wound on the metal rod, and the three windings are arranged on the motor drive circuit, and the motor drive circuit is used to drive the motor in the motor device to rotate. The high gear position of the motor device corresponds to a relay, the medium gear position also corresponds to a relay, and the low gear position also corresponds to a relay. The processing device 300 may send a control signal to the corresponding relay, so that the corresponding relay is electrically attracted to control the different windings wound on the metal rod to have current flowing through. For example, when the motor device needs to be adjusted to a high gear position, the processing device 300 sends a control signal to the relay corresponding to the high gear position, so that the relay of the high gear position is electrically attracted, so that one of the windings wound on the metal rod has current flowing through, while the other two windings have no current flowing through, which is equivalent to two less loads on the motor drive circuit, that is, equivalent to adjusting the motor device to enter the corresponding gear position. Further, the above relays can be replaced with thyristors, etc.

[0030] The gear adjustment circuit of the above-mentioned household appliance generates an induced voltage when the motor device of the household appliance works at the gear set by the user. The signal processing circuit 100 performs signal processing on the induced voltage to obtain an induced electrical signal, and then the sampling circuit 200 performs voltage sampling on the induced electrical signal to obtain sampled voltage data and sends it to the processing device 300. The processing device 300 performs comparative analysis based on the sampled voltage data and a preset voltage value range corresponding to the current gear of the motor device, and outputs a corresponding control signal to adjust the current gear of the motor device, thereby achieving the purpose of adjusting the current gear of the motor device accordingly according to the load change of the motor device of the household appliance to improve the smoke exhaust performance.

[0031] It should be pointed out that the household appliance in the present application is a household appliance with a motor device, which is not necessarily limited to a range hood. For example, the household appliance can also be an electric fan used in household life, etc., which has a corresponding motor device to drive the blades to rotate to achieve the purpose of blowing air.

[0032] In one embodiment, the gear adjustment circuit also includes an optocoupler, and the signal processing circuit 100 and the sampling circuit 200 are isolated from each other by the optocoupler, which is equivalent to setting an optocoupler between the signal processing circuit 100 and the sampling circuit 200. The optocoupler first converts the induced electrical signal into an optical signal, and then restores the optical signal into an induced electrical signal and outputs it to the sampling circuit 200 for voltage sampling, thereby achieving circuit isolation between the signal processing circuit and the sampling circuit.

[0033] In one embodiment, Figure 2As shown, the signal processing circuit 100 includes a first rectifier component 110 and a first filter component 120. One end of the first rectifier component 110 is used to connect to the motor device, and the other end of the first rectifier component 110 is connected to one end of the first filter component 120 and the sampling circuit (connected to the sampling circuit through the connection point A). The other end of the first filter component 120 is used to connect to the motor device. Among them, one end of the first rectifier component 110 is connected to the metal rod mentioned above. Since a plurality of windings are wound around the metal rod, the position of the connection point between one end of the first rectifier component 110 and the metal rod can be changed. Taking two windings as an example, the connection point between one end of the first rectifier component 110 and the metal rod can be located on one side of the two windings, or in the middle of the two windings, and so on.

[0034] The first rectifier component 110 can adopt a half-bridge rectifier structure or a full-bridge rectifier structure, and the first filter component 120 can adopt an RC filter circuit structure. The other end of the corresponding first filter component 120 is also connected to the metal rod mentioned above. For the convenience of description, the connection point between the other end of the first filter component 120 and the metal rod is called the second connection point, and the connection point between one end of the first rectifier component 110 and the metal rod is called the first connection point. A winding is wound in the area between the first connection point and the second connection point of the metal rod, and the number of windings can be one or more.

[0035] Specifically, Figure 2 For example, Figure 2 The motor device in the embodiment includes three windings (i.e., winding 1, winding 2, and winding 3), which are connected in series and are all wound around a metal rod (not shown). The motor device includes three gears (i.e., H, M, and L). When the user sets the H gear, it means that the motor device is at a high gear at this time, winding 1 will be energized, while winding 2 and winding 3 will not be energized, and winding 1 will generate an induced voltage on the metal rod. When the user sets the M gear, it means that the motor device is at a medium gear at this time. When the user sets the L gear, it means that the motor device is at a low gear at this time. It can be understood that when the user sets different gears, the relay controlling the corresponding gear will work, so that the motor device is powered on and works at the corresponding gear. Figure 2 The signal processing circuit 100 in the embodiment includes two ends, one end of the first rectifier component 110 serves as one end of the signal processing circuit 100, and the other end of the first filter circuit serves as the other end of the signal processing circuit 100. Figure 2The two ends of the signal processing circuit 100 are connected to the two ends of the metal rod, and the three windings are respectively wound between the two ends of the metal rod. In other embodiments, the connection points between the two ends of the signal processing circuit 100 and the metal rod can be changed. For example, one end of the signal processing circuit 100 is connected to one end of the metal rod, and the other end of the signal processing circuit 100 is connected to the midpoint of the metal rod. At this time, the winding 1 is just wound between one end of the metal rod and the midpoint of the metal rod, that is, the signal processing circuit 100 obtains the induced voltage generated by the winding 1.

[0036] By providing the first rectifying component 110 and the first filtering component 120, corresponding rectifying and filtering processing can be performed, so that the induced electrical signal output to the sampling circuit is stable and smooth, ensuring that the sampling circuit can sample accurate sampling voltage data.

[0037] Further, in one embodiment, if Figure 2 As shown, the first rectifier component 110 includes a first resistor component and a first diode component, and the first filter component 120 includes a second resistor component and a first capacitor component; one end of the first resistor component is used to connect to the motor device, the other end of the first resistor component is connected to the input end of the first diode component, the output end of the first diode component is connected to the sampling circuit (connected to the sampling circuit through the connection point A), one end of the second resistor component and one end of the first capacitor component, and the other end of the second resistor component and the other end of the first capacitor component are both used to connect to the motor device.

[0038] It should be noted that, the first resistor component includes at least one resistor R1. In other embodiments, the first resistor component can also be composed of multiple resistors connected in series to form the first resistor component. Accordingly, the first diode component includes at least one diode D1, the second resistor component includes at least one resistor R2, and the first capacitor component is also the same. The first diode component, the second resistor component and the first capacitor component can all be formed by multiple diodes or multiple resistors or multiple capacitors connected in series. Furthermore, the parameters of the resistor, diode and capacitor can be adjusted according to the actual situation, which will not be described in detail here.

[0039] One end of the first resistor component is connected to the metal rod in the motor device, and the other end of the second resistor component and the other end of the first capacitor component are both connected to the metal rod in the motor device. Figure 2 The middle winding 1, winding 2 and winding 3 are wound on the metal rod, and the connection point between one end of the first resistance component and the metal rod is located on the right side of winding 3, and the connection point between the other end of the second resistance component and the other end of the first capacitor component and the metal rod is located on the left side of winding 1.

[0040] By setting the connection point between one end of the first resistor component and the metal rod on the right side of the winding 3, and setting the connection point between the other end of the second resistor component and the other end of the first capacitor component and the metal rod on the left side of the winding 1, the entire signal processing circuit 100 is connected across both ends of all windings, thereby ensuring that the induced voltage generated on the metal rod can be detected more accurately.

[0041] In one embodiment, Figure 3 As shown, the sampling circuit includes a first voltage divider component 310 and a second voltage divider component 320, one end of the first voltage divider component 310 is connected to the signal processing circuit, the other end of the first voltage divider component 310 is connected to one end of the second voltage divider component 320 and the processing device, and the other end of the second voltage divider component 320 is grounded.

[0042] Among them, one end of the first voltage dividing component 310 is connected to the point A (connected to Figure 2 The first voltage-dividing component 310 is connected to the signal processing circuit through the connection point A in FIG. 1 , and the other end of the first voltage-dividing component 310 is connected to the processing device through the connection point B. The connection point B is connected to the I / O port of the processing device. The first voltage-dividing component 310 includes at least a resistor Ra, and the second voltage-dividing component 320 includes at least a resistor Rb. By providing the first voltage-dividing component 310 and the second voltage-dividing component 320, voltage division can be performed to prevent the sampling voltage data output to the processing device from being too high and damaging the processing device.

[0043] In one embodiment, Figure 3 As shown, the sampling circuit further includes a second capacitor component 330, one end of the second capacitor component 330 is connected to one end of the first voltage divider component 310, and the other end of the second capacitor component 330 is connected to the other end of the second voltage divider component 320. The second capacitor component 330 includes at least a capacitor C0. Accordingly, in other embodiments, the second capacitor component 330 may also be composed of a plurality of capacitors connected in series or in parallel, etc. By setting the second capacitor component 330, filtering processing can be performed to avoid high-frequency interference, thereby ensuring that the sampled voltage data obtained by the processing device is accurate.

[0044] In one embodiment, Figure 3As shown, the sampling circuit also includes a second diode component 340, the input end of the second diode component 340 is connected to the other end of the first voltage divider component 310, and the output end of the second diode component 340 is used to connect the input power supply VCC. Among them, the other end of the first voltage divider component 310 is connected to the I / O port of the processing device to output the sampled voltage data to the processing device. The second diode component 340 at least includes a diode D2 for clamping. Correspondingly, in other embodiments, the second diode component 340 can also be composed of multiple diodes connected in parallel or in series, etc. By setting the second diode component 340, it is possible to prevent the voltage output from the sampling circuit to the processing device from having pulse spikes, which interfere with and damage the I / O interface of the processing device.

[0045] In one embodiment, a household appliance is provided, the household appliance comprising a motor device and the above-mentioned gear adjustment circuit. Specifically, the household appliance may be a range hood or an electric fan, etc. The household appliance has a motor device. When the load of the motor device changes (for example, when the pressure of the common flue increases, the load of the motor device of the range hood will increase), the induced voltage of the winding of the motor device wound on the metal rod will change, so that the above-mentioned gear adjustment circuit adjusts the current gear of the motor device accordingly according to the change of the induced voltage.

[0046] In the above-mentioned household appliance, when the motor device of the household appliance works at the gear position set by the user, an induced voltage is generated. The signal processing circuit processes the induced voltage to obtain an induced electrical signal, and then the sampling circuit samples the voltage of the induced electrical signal to obtain sampled voltage data and sends it to the processing device. The processing device compares and analyzes the sampled voltage data and the preset voltage value range corresponding to the current gear position of the motor device, and outputs a corresponding control signal to adjust the current gear position of the motor device, thereby realizing the purpose of monitoring the load change of the motor device of the household appliance according to the induced voltage, thereby adjusting the current gear position of the motor device accordingly, so as to improve the smoke exhaust performance.

[0047] In one embodiment, the motor device includes a motor and two or more windings, each winding is wound on a metal rod, and each winding is connected to the motor after being connected in series. Among them, blades are provided on the motor, and when the motor rotates, the blades are driven to rotate, and the windings are used to adjust the gear position. For example, two windings are wound in series on the metal rod, and the two windings are connected to the motor. When one of the windings is energized and the other winding is not energized, the motor is in a high gear. When both windings are energized, the motor is in a low gear. Further, a corresponding relay can be set to control the corresponding winding to be energized or deenergized. It should be noted that winding the winding on the metal rod does not mean that the winding is electrically connected to the metal rod, that is, when the winding is energized, it will only generate an induced voltage on the metal rod, and will not cause the current flowing through the winding to flow to the metal rod.

[0048] In one embodiment, one end of the signal processing circuit in the above-mentioned gear adjustment circuit is connected to one end of the metal rod, and the other end of the signal processing circuit is connected to the other end of the metal rod. It can be understood that the metal rod has two ends, and each winding is wound between the two ends on the metal rod. The head end of the metal rod can be used as one end of the metal rod, and the tail end of the metal rod can be used as the other end of the metal rod, so that the induced voltage generated on the metal rod by all the windings wound on the metal rod can be obtained by the signal processing circuit, so as to ensure more accurate detection of the induced voltage generated on the metal rod. In other embodiments, there are two or more windings connected in series on the metal rod, and there is a connection point between the windings, and the connection point will also have a mapping position point on the metal rod. One end of the signal processing circuit is connected to the mapping position point, and the other end of the signal processing circuit is connected to the head end or the tail end of the metal rod. In this way, the induced voltage generated by one of the windings on the metal rod will be obtained by the signal processing circuit, while the induced voltage generated by the other winding on the metal rod will not be obtained by the signal processing circuit, thereby achieving control of the size of the obtained induced voltage.

[0049] In one embodiment, the metal rod includes a head end and a tail end, each winding is wound between the head end and the tail end of the metal rod, one end of the signal processing circuit is connected to the head end of the metal rod, and the other end of the signal processing circuit is connected to the tail end of the metal rod. The signal processing circuit includes two ends, and when both ends of the signal processing circuit are connected to the metal rod, a current can be formed, thereby obtaining an induced voltage on the metal rod. It can be understood that when one end of the signal processing circuit is connected to the head end of the metal rod, and the other end of the signal processing circuit is connected to the tail end of the metal rod, the induced voltage generated by each winding will be obtained by the signal processing circuit, thereby ensuring more accurate detection of the induced voltage generated on the metal rod.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A gear adjustment circuit for household appliances, characterized in that: The gear adjustment circuit includes a signal processing circuit, a sampling circuit and a processing device; the signal processing circuit is used to connect to the motor device of the household appliance, the sampling circuit is connected to the signal processing circuit and the processing device, and the processing device is used to connect to the motor device; The motor device has a plurality of windings inside, and the windings are all wound on a metal rod. One end of the signal processing circuit is connected to one end of the metal rod, and the other end of the signal processing circuit is connected to the other end of the metal rod. According to different set gears, a corresponding number of the windings will be energized. When the windings wound on the metal rod are energized, the signal processing circuit obtains the induced voltage generated by the motor device, and performs signal processing to obtain an induced electrical signal. The sampling circuit is used to perform voltage sampling on the induced electrical signal, obtain sampled voltage data and output it to the processing device; The processing device is used to output a corresponding control signal to adjust the current gear position of the motor device according to the sampled voltage data and a preset voltage value range corresponding to the current gear position of the motor device.

2. The gear adjustment circuit of household electrical appliances according to claim 1, characterized in that: The signal processing circuit includes a first rectifier component and a first filter component, one end of the first rectifier component is used to connect to the motor device, the other end of the first rectifier component is connected to one end of the first filter component and the sampling circuit, and the other end of the first filter component is used to connect to the motor device.

3. The gear adjustment circuit of household electrical appliances according to claim 2, characterized in that: The first rectifier component includes a first resistor component and a first diode component, and the first filter component includes a second resistor component and a first capacitor component; one end of the first resistor component is used to connect the motor device, the other end of the first resistor component is connected to the input end of the first diode component, the output end of the first diode component is connected to the sampling circuit, one end of the second resistor component and one end of the first capacitor component, and the other end of the second resistor component and the other end of the first capacitor component are both used to connect the motor device.

4. The gear adjustment circuit of household electrical appliances according to claim 1, characterized in that: The sampling circuit includes a first voltage divider component and a second voltage divider component, one end of the first voltage divider component is connected to the signal processing circuit, the other end of the first voltage divider component is connected to one end of the second voltage divider component and the processing device, and the other end of the second voltage divider component is grounded.

5. The gear adjustment circuit of household electrical appliances according to claim 4, characterized in that: The sampling circuit further includes a second capacitor component, one end of the second capacitor component is connected to one end of the first voltage divider component, and the other end of the second capacitor component is connected to the other end of the second voltage divider component.

6. The gear adjustment circuit of household electrical appliances according to claim 4, characterized in that: The sampling circuit further includes a second diode component, an input end of the second diode component is connected to the other end of the first voltage divider component, and an output end of the second diode component is used to connect to an input power supply.

7. A household appliance, characterized in that: The household appliance comprises a motor device and a gear adjustment circuit as described in any one of claims 1-6.

8. The household appliance according to claim 7, characterized in that: The motor device comprises a motor, and each of the windings is connected to the motor after being connected in series.

9. The household appliance according to claim 7, characterized in that: The metal rod comprises a head end and a tail end, each of the windings is wound between the head end and the tail end of the metal rod, one end of the signal processing circuit is connected to the head end of the metal rod, and the other end of the signal processing circuit is connected to the tail end of the metal rod.

10. The household appliance according to claim 7, characterized in that: The household appliance is a range hood.

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