A control method and device for a range hood

Abstract

The present invention discloses a control method and device for a range hood. Among them, the control method of the range hood includes the following steps: the control module obtains in real time the current value of the mains electricity detected by the current detection module; the control module determines the change trend of the current value and calculates the change value of the current value; the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value and sends a control signal to the motor drive module, so that the motor drive module drives the motor to work in the working gear. The present invention can control the motor of the range hood to work in the corresponding gear according to the change of the mains electricity, so as to achieve the best smoke exhaust effect.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliance products, and in particular to a control method and device for a range hood. Background Art

[0002] Currently, most household range hoods are driven by mains power. When the mains voltage drops, the driving current becomes smaller, the rotational speed of the motor inside the range hood slows down, and the smoke exhaust effect deteriorates. Similarly, when the ventilation condition of the air duct is poor (for example, there are many bends in the air duct, the air duct becomes smaller at a certain place, there is backflow of air, etc.), the driving current also becomes smaller. Although the rotational speed of the motor will increase, the smoke exhaust effect will also deteriorate. Therefore, how to reasonably control the operation of the motor of the range hood according to the change of the mains power has become a technical problem urgently to be solved in the prior art. Summary of the Invention

[0003] The present invention provides a control method and device for a range hood, which can control the motor of the range hood to operate at a corresponding gear according to the change of the mains power to achieve the best smoke exhaust effect.

[0004] To solve the above problems, the present invention adopts the following technical solutions:

[0005] According to a first aspect of the present invention, an embodiment of the present invention provides a control method for a range hood, including the following steps: a control module real-time obtains the current value of the mains power detected by a current detection module; the control module determines the change trend of the current value and calculates the change value of the current value; the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value and sends a control signal to a motor drive module, so that the motor drive module drives the motor to operate at the working gear.

[0006] Preferably, when the change trend of the current value is decreasing, the step in which the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value specifically includes: the control module calculates the change rate of the current value, determines whether the change rate of the current value is greater than a first threshold, and if the change rate of the current value is greater than the first threshold, determines that the working gear of the motor is to be increased by 1 gear.

[0007] Preferably, when the change trend of the current value is decreasing, the step in which the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value specifically includes: the control module determines the actual working gear of the motor, determines whether the current value is less than the lowest current threshold of the actual working gear, and if the current value is less than the lowest current threshold of the actual working gear, determines that the working gear of the motor is to be increased by 1 gear.

[0008] Preferably, when the control module determines that the operating gear of the motor is the upshift gear 1, it saves the current value and sets the value of the preset upshift flag to 1.

[0009] Preferably, the following steps are further included: the control module determines whether the value of the preset upshift flag is 1. If the value of the preset upshift flag is 1, it determines whether the previous upshift time is greater than the second threshold. If it is greater than the second threshold, it determines whether the detected current value is greater than the saved current value. If the detected current value is greater than the saved current value, it determines whether the difference between the detected current value and the saved current value is greater than the third threshold. If the difference is greater than the third threshold, it determines that the operating gear of the motor is the downshift gear 1 and sets the value of the preset upshift flag to 0.

[0010] Preferably, the following steps are further included: when the control module receives an instruction for the motor to stop rotating, it measures the stop time of the motor. If the measurement is greater than the fourth threshold, it sets the operating time of the motor to zero. If the measurement is less than or equal to the fourth threshold, it extends the stop time of the motor by a first preset time, and then determines whether the operating time of the motor is greater than zero. If the operating time of the motor is greater than zero, it shortens the stop time of the motor by a second preset time.

[0011] According to the second aspect of the present invention, an embodiment of the present invention provides a control device for a range hood, including a control module, a current detection module, a motor drive module, and a zero-crossing detection module. The input end of the motor drive module is used for electrical connection with the mains power supply, the output end of the motor drive module is used for electrical connection with the motor, and the control end of the motor drive module is electrically connected to the control module. The input end of the current detection module is used for electrical connection with the line between the mains power supply and the motor drive module, and the output end of the current detection module is electrically connected to the control module. The input end of the zero-crossing detection module is used for electrical connection with the mains power supply, and the output end of the zero-crossing detection module is electrically connected to the control module. The control module is configured to execute the control method for the range hood according to any one of the above first aspects.

[0012] Preferably, the control device for the range hood further includes an anti-interference module, and the anti-interference module is connected in series between the mains power supply and the zero-crossing detection module.

[0013] Preferably, the motor drive module includes a high-gear drive module and a low-gear drive module. The input ends of the high-gear drive module and the low-gear drive module are both used for electrical connection with the mains power supply. The output ends of the high-gear drive module and the low-gear drive module are both used for electrical connection with the motor. The control ends of the high-gear drive module and the low-gear drive module are both electrically connected to the control module.

[0014] Preferably, the control device of the range hood further includes a prompting module electrically connected to the control module, and the prompting module is used to prompt the user when the gear of the motor changes.

[0015] The present invention has at least the following beneficial effects: The present invention can determine the change trend of the current value and calculate the change value of the current value, and then determine the working gear of the motor according to the change trend and the change value of the current value. In this way, no matter how the mains power changes, the motor can always work in the best gear to achieve the best smoke exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flowchart of the control method of the range hood according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the circuit module of the control device of the range hood according to an embodiment of the present invention;

[0018] Figure 3 It is a schematic diagram of the circuit module of the control device of the range hood according to another embodiment of the present invention;

[0019] Figure 4 It is a schematic diagram of the circuit module of the control device of the range hood according to yet another embodiment of the present invention;

[0020] Figure 5 It is a schematic diagram of the circuit structure of the control module according to an embodiment of the present invention;

[0021] Figure 6 It is a schematic diagram of the circuit structure of the current detection module and the motor drive module according to an embodiment of the present invention;

[0022] Figure 7 It is a schematic diagram of the circuit structure of the anti-interference module and the zero-crossing detection module according to an embodiment of the present invention;

[0023] Figure 8 It is a schematic diagram of the circuit structure of the warning module according to an embodiment of the present invention;

[0024] Figure 9 It is a schematic diagram of the circuit structure of the communication interface module according to an embodiment of the present invention;

[0025] Figure 10 It is a schematic diagram of the circuit structure of the lighting module according to an embodiment of the present invention.

[0026] Among them, the attached drawing reference numerals are: mains power supply 10, motor 20, control module 100, current detection module 200, motor drive module 300, high gear drive module 310, low gear drive module 320, zero-crossing detection module 400, anti-interference module 410, conversion module 420, prompt module 500, communication interface module 600, lighting module 700. Detailed implementation manners

[0027] The present disclosure provides the following description with reference to the accompanying drawings to help a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as merely exemplary. Therefore, those of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of the functions and configurations of the disclosure may be omitted for clarity and conciseness.

[0028] The terms and words used in the following description and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, those skilled in the art should clearly understand that the following description of the various embodiments of the present disclosure is only for illustration, and not for limiting the present disclosure as defined by the appended claims and their equivalents.

[0029] In various embodiments of the present disclosure, the terms "having", "may have", "including", or "may include" indicate the existence of the corresponding functions, operations, elements, etc. of the disclosure, but do not limit the existence of one or more additional functions, operations, elements, etc. In addition, it should be understood that the terms "including" or "having" used in the various embodiments of the present disclosure are intended to indicate the existence of the features, numbers, operations, elements, components, or combinations thereof described in the specification, but do not exclude the existence or addition of one or more other features, numbers, operations, elements, components, or combinations thereof.

[0030] It should be understood that when an element (e.g., a first element) is "connected" to another element (e.g., a second element), the element can be directly connected to the other element, or there can be an intermediate element (e.g., a third element) between the element and the other element.

[0031] An embodiment of the present invention provides a control method for a range hood, as Figure 1 shown, including the following steps:

[0032] S100. The control module obtains in real time the current value of the mains detected by the current detection module. The input end of the current detection module is electrically connected to the line between the mains and the motor drive module to detect the current value supplied by the mains to the motor drive module. The control module may have a preset sampling period, and the current value within each sampling period can be recorded.

[0033] S200. The control module determines the change trend of the current value and calculates the change value of the current value. Specifically, the control module can judge the change trend of the current value according to the current values within multiple consecutive sampling periods, that is, judge whether the current is decreasing or increasing. At the same time, the difference between the current values of two adjacent periods can be calculated to obtain the change value of the current value, and the change rate of the current value can also be calculated according to the change value.

[0034] S300. The control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value, and sends a control signal to the motor drive module, so that the motor drive module drives the motor to work in the working gear. It should be noted here that the motor driven by the motor drive module is the motor that drives the impeller to rotate in the range hood. The control module can pre-store the mapping table of the change trend of the current value, the change value of the current value and the working gear of the motor. According to the mapping table, the working gear of the motor corresponding to the change trend of the current value and the change value of the current value can be determined. The control module then sends a control signal to the motor drive module, and the motor drive module controls the motor to work in the determined working gear according to this control signal.

[0035] In some embodiments, when the change trend of the current value is decreasing, the step in S300 where the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value specifically includes: the control module calculates the change rate of the current value, judges whether the change rate of the current value is greater than the first threshold value. If the change rate of the current value is greater than the first threshold value, it is determined that the working gear of the motor is to rise by one gear.

[0036] The change rate of the current value is the ratio of the difference value of the current value to the current value of the previous sampling period. If the current value drops too much, the rotation speed of the motor is insufficient. Therefore, in this embodiment, the working gear of the motor is raised by one gear to increase the wind force.

[0037] In some embodiments, when the change trend of the current value is decreasing, the step in S300 where the control module determines the working gear of the motor according to the change trend of the current value and the change value of the current value specifically includes: the control module determines the actual working gear of the motor, judges whether the current value is less than the lowest current threshold value of the actual working gear. If the current value is less than the lowest current threshold value of the actual working gear, it is determined that the working gear of the motor is to rise by one gear.

[0038] Each gear of the motor has a relatively fixed current value range. If the actual current value is lower than the lowest current threshold of the actual working gear of the motor, it also indicates that the rotational speed of the current is insufficient. In this embodiment, the wind force is also increased by increasing the gear.

[0039] Further, when the control module determines that the working gear of the motor is to increase by one gear, it saves the current value and sets the preset gear-up flag to 1.

[0040] After saving the current value, it can be used for subsequent calculations. When the preset gear-up flag is set to 1, it indicates that the motor has shifted up a gear. If the preset gear-up flag is set to 0, it indicates that the motor has shifted down a gear.

[0041] In some embodiments, the following steps are further included: determining whether the value of the preset gear-up flag is 1. If the value of the preset gear-up flag is 1, it indicates that the motor has shifted up a gear. Then, it is determined whether the time of the previous gear-up (i.e., the time since the completion of the previous gear-up) is greater than a second threshold. This is to ensure that there is a sufficient time interval between two adjacent gear-changing operations. If the interval time is too short, the gear-changing effect will not be achieved. Only when the time of the previous gear-up is greater than the second threshold, it is further determined whether the detected current value is greater than the saved current value. If the detected current value is greater than the saved current value, it is determined whether the difference between the detected current value and the saved current value is greater than a third threshold. If the difference is greater than the third threshold, the working gear of the motor is determined to be down by one gear, and the preset gear-up flag is set to 0.

[0042] In some embodiments, the following steps are further included: when the control module receives an instruction for the motor to stop rotating, it measures the stop time of the motor; if the measurement is greater than a fourth threshold, the working time of the motor is set to zero; if the measurement is less than or equal to the fourth threshold, the stop time of the motor is extended by a first preset time, and then it is determined whether the working time of the motor is greater than zero. If the working time of the motor is greater than zero, the stop time of the motor is shortened by a second preset time. Here, the fourth threshold is the maximum allowable stop time of the motor. This embodiment is to adjust the lowest current value of the working gear of the motor, that is, to perform current compensation, because as the working time of the motor increases, the current will decrease according to a certain curve, and when the working time reaches a certain value, it will no longer decrease or the change amount is very small. After the lowest current value of the working gear where the motor is located is compensated, it can more accurately determine whether to increase the working gear of the motor by one gear.

[0043] An embodiment of the present invention provides a control device for a range hood, such as Figure 2As shown in the figure, it includes a control module 100, a current detection module 200, a motor drive module 300, and a zero-crossing detection module 400. The input end of the motor drive module 300 is used for electrically connecting to the mains power supply, the output end of the motor drive module 300 is used for electrically connecting to the motor 20, the control end of the motor drive module 300 is electrically connected to the control module 100, the mains power supply 10 provides power, the motor 20 is the object to be driven, the control module 100 can send a control signal to the motor drive module 300, and the motor drive module 300 will drive the motor 20 to work in the corresponding working gear according to this control signal. The input end of the current detection module 200 is used for electrically connecting to the line between the mains power supply 10 and the motor drive module 300, and the output end of the current detection module 200 is electrically connected to the control module 100 to send the detected current value to the control module 100. The input end of the zero-crossing detection module 400 is used for electrically connecting to the mains power supply 10, and the output end of the zero-crossing detection module 400 is electrically connected to the control module 100 to detect the zero-crossing point of the mains power supply 10. The control module 100 is configured to execute the control method of the range hood in any of the above embodiments. For the description of the control method of the range hood, reference can be made to the above embodiments and will not be elaborated here.

[0044] In some embodiments, as Figure 3 shown, the control device of the range hood further includes an anti-interference module 410, and the anti-interference module 410 is connected in series between the mains power supply 10 and the zero-crossing detection module 400. The anti-interference module 410 is used to remove the impurity waves in the line and improve the anti-interference ability. In this way, the waveform output by the mains power supply 10 is relatively clean, so that the zero-crossing signal is relatively reliable and there will be no false zero-crossing signal caused by the interference signal from the mains power supply 10. When the zero-crossing signal is very reliable, power is always supplied to or cut off from the motor when the mains power supply 10 is close to zero, avoiding large current impact and ensuring the service life of electrical components.

[0045] In some embodiments, the motor driving module 300 includes a high-gear driving module and a low-gear driving module. The input ends of both the high-gear driving module and the low-gear driving module are used to be electrically connected to the mains power supply 10, the output ends of both the high-gear driving module and the low-gear driving module are used to be electrically connected to the motor 20, and the control ends of both the high-gear driving module and the low-gear driving module are electrically connected to the control module 100. When it is necessary to make the motor work in the high gear, the control module 100 can drive the high-gear driving module to work. When it is necessary to make the motor work in the low gear, the control module 100 can drive the low-gear driving module to work. And when it is necessary to make the motor work in the intermediate gear, the control module 100 can control the high-gear driving module and the low-gear driving module to work intermittently, and adjust the gear by controlling the working time of the high-gear driving module and the low-gear driving module. In this way, theoretically, multiple gears can be obtained. Compared with the traditional motor driving circuit, in this embodiment, multiple gear controls can be achieved through two gear drives, which can simplify the circuit structure and reduce wiring.

[0046] In some embodiments, as Figure 4 shown, the control device of the range hood further includes a prompting module 500 electrically connected to the control module 100. The prompting module 500 is used to prompt the user when the gear of the motor 20 changes. Specifically, the prompting module 500 may include an indicator light to light up when shifting gears, or the prompting module 500 may include a buzzer to sound when shifting gears, so as to inform the user that the gear of the motor 20 has changed.

[0047] Furthermore, the control device of the range hood further includes a communication interface module 600 electrically connected to the control module 100. The communication interface module 600 can be electrically connected to an external display circuit board to display the gear-changing information on the display screen, so as to facilitate the user to know the working state of the motor 20.

[0048] Even further, the control device of the range hood further includes a lighting module 700 electrically connected to the control module 100. The lighting module 700 can provide lighting for the user.

[0049] In some embodiments, as Figure 5 shown, the control module may include the chip BF7512DM16. Of course, according to actual needs, other chips or other circuits can also be used to implement the functions of the above control module.

[0050] In some embodiments, as Figure 6As shown, the current detection module 200 includes a current transformer T10, a diode D2, a capacitor C13, a capacitor EC8, a resistor R38, and a resistor R39. The circuit of this embodiment is simple, low in cost, and reliable in performance. The used diode D2 is a Schottky diode with an extremely low forward voltage drop. By respectively setting the optimal resistance value and capacitance value for the resistor and capacitor connected thereto, when the main circuit current changes, the voltage at AD_AMP will change significantly, making it easier to be detected by the control module.

[0051] In some embodiments, as Figure 6 shown, both the high - gear drive module 310 and the low - gear drive module 320 include optocouplers, and the switching tubes use thyristors, which can reduce the interference of thyristors to the control module and is beneficial to improving reliability.

[0052] In some embodiments, as Figure 7 shown, an anti - interference module 410 is connected in series between the zero - crossing detection module 400 and the mains power. The anti - interference module 410 may include an RC filter circuit and a common - mode inductor LF, and protection devices such as fuses and varistors are also connected at a position close to the mains power.

[0053] Furthermore, the output end of the anti - interference module 410 is also connected to a conversion module 420. The conversion module 420 can implement AC - DC electrical signal conversion to output DC electrical signals such as 12V and 5V for use by other circuit modules.

[0054] In some embodiments, as Figure 8 shown, the prompt module may include a buzzer BUZ1 and three triodes. By turning the three triodes on and off, the buzzer can be controlled to sound in different ways.

[0055] In some embodiments, as Figure 9 shown, the communication interface module includes a communication port CN3, and the communication port CN3 can be electrically connected to other display board circuits.

[0056] In some embodiments, as Figure 10 shown, the lighting module may include two triodes. The interface CN6 is electrically connected to the lighting lamp, and the lighting lamp is controlled to turn on or off by turning the two triodes on and off.

[0057] The above content is a further detailed description of the present invention in combination with specific implementation manners. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can also be made.

Claims

1. A control method for a range hood, characterized in that, It includes the following steps: The control module (100) acquires in real time the current value of the mains power supply (10) detected by the current detection module (200); The control module (100) determines the change trend of the current value and calculates the change value of the current value; The control module (100) determines the working gear of the motor (20) according to the change trend of the current value and the change value of the current value, and sends a control signal to the motor drive module (300) so that the motor drive module (300) drives the motor (20) to work in the working gear; When the change trend of the current value is decreasing, the step in which the control module (100) determines the working gear of the motor (20) according to the change trend of the current value and the change value of the current value specifically includes: the control module (100) calculates the change rate of the current value, determines whether the change rate of the current value is greater than a first threshold value. If the change rate of the current value is greater than the first threshold value, it is determined that the working gear of the motor (20) is to shift up one gear. Or, the control module (100) determines the actual working gear of the motor (20), and determines whether the current value is less than the lowest current threshold value of the actual working gear. If the current value is less than the lowest current threshold value of the actual working gear, it is determined that the working gear of the motor (20) is to shift up one gear; While determining that the working gear of the motor (20) is to shift up one gear, the control module (100) saves the current value and sets the preset upshift flag to 1; It further includes the following steps: the control module (100) determines whether the value of the preset upshift flag is 1. If the value of the preset upshift flag is 1, it determines whether the previous upshift time is greater than a second threshold value. If it is greater than the second threshold value, it determines whether the detected current value is greater than the saved current value. If the detected current value is greater than the saved current value, it determines whether the difference between the detected current value and the saved current value is greater than a third threshold value. If the difference is greater than the third threshold value, it is determined that the working gear of the motor (20) is to shift down one gear, and the preset upshift flag is set to 0.

2. The control method of the range hood according to claim 1, wherein, It further includes the following steps: when the control module (100) receives an instruction for the motor to stop rotating, it times the stop time of the motor (20); if the timing is greater than a fourth threshold value, it sets the working time of the motor (20) to zero; if the timing is less than or equal to the fourth threshold value, it extends the stop time of the motor (20) by a first preset time, and then determines whether the working time of the motor (20) is greater than zero. If the working time of the motor (20) is greater than zero, it shortens the stop time of the motor (20) by a second preset time.

3. A control device for an oil fume extractor, characterized in that: It includes a control module (100), a current detection module (200), a motor drive module (300) and a zero-crossing detection module (400); the input end of the motor drive module (300) is used for electrically connecting to the mains power (10), the output end of the motor drive module (300) is used for electrically connecting to the motor (20), and the control end of the motor drive module (300) is electrically connected to the control module (100); the input end of the current detection module (200) is used for electrically connecting to the line between the mains power (10) and the motor drive module (300), and the output end of the current detection module (200) is electrically connected to the control module (100); the input end of the zero-crossing detection module (400) is used for electrically connecting to the mains power (10), and the output end of the zero-crossing detection module (400) is electrically connected to the control module (100); the control module (100) is configured to execute the control method of the range hood according to any one of claims 1-2.

4. The control device of the range hood according to claim 3, characterized in that: The control device of the range hood further includes an anti-interference module (410), and the anti-interference module (410) is connected in series between the mains power (10) and the zero-crossing detection module (400).

5. The control device of the range hood according to claim 3, characterized in that: The motor drive module (300) includes a high-gear drive module (310) and a low-gear drive module (320). The input ends of the high-gear drive module (310) and the low-gear drive module (320) are both used for electrically connecting to the mains power (10), the output ends of the high-gear drive module (310) and the low-gear drive module (320) are both used for electrically connecting to the motor (20), and the control ends of the high-gear drive module (310) and the low-gear drive module (320) are both electrically connected to the control module (100).

6. The control device of the range hood according to claim 3, wherein: The control device of the range hood further includes a prompt module (500) electrically connected to the control module (100), and the prompt module (500) is used to prompt the user when the gear of the motor (20) changes.

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