Range hood negative ion control method and system and range hood

Abstract

The invention relates to a range hood negative ion control method and system and a range hood. The method comprises the steps that working current of a negative ion device is obtained; and when the working current meets the preset working condition, the rotating speed of the fan module and the on-off state of the negative ion device are adjusted, and output control over negative ions is achieved. The working current of the negative ion device is compared with the preset working condition, the fan module can drive negative ions to flow by adjusting the rotating speed of the fan module according to the comparison result, and it is ensured that air is effectively purified; the on-off state of the negative ion device is adjusted, so that the working current of the negative ion device is in a normal working current range, arc bridging of an emission head of the negative ion device is avoided, interference to a control panel and even an electric shock phenomenon are avoided, and the safety of the range hood is improved.

Description

Technical Field

[0001] The present application relates to the technical field of range hoods, and particularly to a negative ion control method and system for a range hood and a range hood. Background Art

[0002] A range hood, also known as an oil fume extractor, is an electrical appliance used to purify the kitchen environment. The range hood is installed above the kitchen stove and can quickly extract and discharge the oil fume and waste generated during the cooking process to the outside, thereby purifying the indoor air. If the range hood cannot quickly discharge the oil fume during the cooking process, there will be a situation of oil fume escape and smoke leakage, resulting in continuously high concentrations of PM2.5, other gas molecules, and smoke in the kitchen.

[0003] By setting a negative ion device on the range hood, the negative ion device can release negative ions through ionization technology. The negative ions can effectively remove PM2.5, harmful gases, and odor molecules in the room, improve the indoor air quality, and thus achieve the effect of purifying the air.

[0004] However, for the existing negative ion devices used in range hoods, oil dew adhesion is likely to occur, resulting in a reduction in the creepage distance, a decrease in the impedance between the discharge probe and the chassis ground of the range hood, and arc bridging discharge, causing interference to the control board and even electric shock. Summary of the Invention

[0005] Based on this, a negative ion control method and system for a range hood and a range hood are provided.

[0006] In a first aspect, the present application provides a negative ion control method for a range hood, which is applied to a range hood. The range hood is provided with a negative ion device and a fan module, and the fan module is used to drive the flow of negative ions generated by the negative ion device. The negative ion control method for the range hood includes the following steps:

[0007] Obtain the working current of the negative ion device;

[0008] When the working current meets the preset working conditions, adjust the rotation speed of the fan module and the on / off state of the negative ion device.

[0009] In one embodiment, the step of adjusting the rotation speed of the fan module and the on / off state of the negative ion device when the working current meets the preset working conditions includes:

[0010] When the working current is less than the first current threshold, control the fan module to rotate at the first rotation speed, and control the negative ion device to be continuously turned on based on the first control signal;

[0011] When the working current is greater than or equal to the first current threshold, adjust the rotation speed of the fan module and the on / off state of the negative ion device.

[0012] In one embodiment, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotational speed of the fan module include:

[0013] Obtain a current coefficient according to the working current and the first current threshold;

[0014] Adjust the rotational speed of the fan module according to the current coefficient.

[0015] In one embodiment, the steps of adjusting the rotational speed of the fan module according to the current coefficient include:

[0016] When the current coefficient is greater than the first coefficient threshold, control the fan module to rotate based on the first rotational speed;

[0017] When the current coefficient is less than or equal to the first coefficient threshold and greater than the second coefficient threshold, control the fan module to rotate based on the second rotational speed;

[0018] When the current coefficient is less than or equal to the second coefficient threshold, control the fan module to rotate based on the third rotational speed; the third rotational speed is greater than the second rotational speed, and the second rotational speed is greater than the first rotational speed.

[0019] In one embodiment, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotational speed of the fan module and adjusting the on / off state of the negative ion device include:

[0020] When the working current is greater than or equal to the first current threshold and less than the second current threshold, control the fan module to rotate based on the fourth rotational speed, and control the negative ion device to conduct intermittently based on the second control signal; the fourth rotational speed is greater than the first rotational speed;

[0021] When the working current is greater than or equal to the second current threshold and less than the third current threshold, control the fan module to rotate based on the fifth rotational speed, and control the negative ion device to conduct intermittently based on the third control signal; the fifth rotational speed is greater than the fourth rotational speed.

[0022] In one embodiment, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotational speed of the fan module and adjusting the on / off state of the negative ion device further include:

[0023] When the working current is greater than or equal to the third current threshold, control the fan module to rotate based on the first rotational speed and control the negative ion device to turn off.

[0024] In one embodiment, the second control signal is a PWM signal, and the third control signal is a pulse signal.

[0025] Second aspect, the present application provides a negative ion control system for a range hood, including a control circuit board, a negative ion device, and a fan module. The control circuit board is respectively connected to the negative ion device and the fan module;

[0026] The control circuit board is used to execute the steps of the range hood negative ion control method as described in any one of the above.

[0027] In one embodiment, the control circuit board includes a processing chip, a switch control circuit, and a sampling circuit;

[0028] The processing chip is respectively connected to the fan module, the switch control circuit, and the sampling circuit; the sampling circuit is used to connect to the switch control circuit; the switch control circuit is used to connect to the negative ion device.

[0029] Third aspect, the present application provides a range hood, including a range hood body and the above-mentioned range hood negative ion control system; the range hood negative ion control system is arranged on the range hood body.

[0030] One of the above technical solutions has the following advantages and beneficial effects:

[0031] In the above range hood negative ion control method, which is applied to a range hood, the range hood is provided with a negative ion device and a fan module. The fan module is used to drive the negative ions generated by the negative ion device to flow. The range hood negative ion control method includes the following steps: obtaining the working current of the negative ion device; when the working current meets the preset working conditions, adjusting the rotation speed of the fan module and adjusting the on / off state of the negative ion device to achieve the output control of the negative ions. The present application compares the working current of the negative ion device with the preset working conditions, and according to the comparison result, by adjusting the rotation speed of the fan module, the fan module can drive the negative ions to flow, ensuring effective air purification; adjusting the on / off state of the negative ion device so that the working current of the negative ion device is within the normal working current range, avoiding arc bridging of the emission head of the negative ion device, avoiding interference to the control board and even electric shock, and improving the safety of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the application scenario of the range hood negative ion control method in the embodiment of the present application;

[0033] Figure 2 It is the first flow chart of the range hood negative ion control method in the embodiment of the present application;

[0034] Figure 3 It is the first flow chart of the negative ion control step in the embodiment of the present application;

[0035] Figure 4 It is the third flow chart of the rotation speed processing step of the fan module in the embodiment of the present application;

[0036] Figure 5 This is the second process schematic diagram of the negative ion control step in the embodiment of the present application;

[0037] Figure 6 This is the first structural schematic diagram of the range hood negative ion control system in the embodiment of the present application;

[0038] Figure 7 This is the second structural schematic diagram of the range hood negative ion control system in the embodiment of the present application;

[0039] Figure 8 This is the circuit schematic diagram of the range hood negative ion control system in the embodiment of the present application. Detailed implementation manners

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present application described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] In addition, the meaning of the term "plurality" should be two or more.

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] The range hood negative ion control method provided by the present application can be applied to, for example Figure 1In the application environment shown. Among them, the processing device may include a processor 102 and a memory 104. The memory 104 can be used to store data such as the working current and the rotation speed of the fan module. The processor 102 can be used to obtain the working current of the negative ion device; when the working current meets the preset working conditions, adjust the rotation speed of the fan module and the on / off state of the negative ion device. The processing device may also include a display 106, and the display 106 can display data such as the rotation speed of the fan module and the on / off state of the negative ion device through a graphical interface. Exemplarily, the processing device can be the control circuit board of a range hood, and the processing device is arranged on the range hood. The range hood is provided with a negative ion device and a fan module, and the processor is connected to the negative ion device and the fan module. The fan module is used to drive the negative ions generated by the negative ion device to flow.

[0045] In one embodiment, as Figure 2 shown, a method for controlling negative ions in a range hood is provided. Taking the processor 102 in Figure 1 as an example, the method includes the following steps:

[0046] Step S210, obtain the working current of the negative ion device.

[0047] Among them, the negative ion device is used to generate negative ions, and the fan module is used to drive the negative ions to flow, thereby forming a negative ion air flow. The negative ion air flow can effectively remove PM2.5, harmful gases and odor molecules in the room, and achieve the purification of kitchen air.

[0048] By sampling the current of the negative ion device, the working current of the negative ion device can be sampled. Exemplarily, after the negative ion device is powered on and started, the working current of the negative ion device can be collected in real time based on a preset detection period, and then the working current of the corresponding detection period can be obtained. It should be noted that the working current of the negative ion device is the output current of the negative ion device.

[0049] Step S220, when the working current meets the preset working conditions, adjust the rotation speed of the fan module and the on / off state of the negative ion device.

[0050] When the negative ion device is working, a high-voltage corona is generated and electrons are released outward. Electrostatic accumulation and ion polymerization effects (i.e., the polymerization of ions with the same electrical properties) will occur on the insulating plastic parts of the control circuit board. Due to the air gap between the insulating plastic parts of the control circuit board and the metal shell, and the excessive difference in the electrostatic accumulation speed and release speed between the insulating plastic parts and the metal shell, a transient electric field is extremely likely to be formed. If a transient electric field is generated, the discharge impedance of the high-voltage discharge to the metal shell becomes relatively smaller, causing the loop current of the negative ion device to increase, thereby interfering with the control circuit board. In this application, by judging whether the working current of the negative ion device meets the preset working conditions, when the working current meets the preset working conditions, the on-off state of the negative ion device is adjusted, and then the conduction time of the negative ion device is adjusted, so that the working current of the negative ion device is always within the normal working current range, thereby avoiding the occurrence of arc bridging phenomenon in the negative ion device and preventing interference to the control circuit board.

[0051] The number of negative ions output by the negative ion device is different under different working currents and conduction durations. For example, when the conduction duration of the negative ion device becomes shorter, the rotation speed of the fan module is increased to accelerate the flow of negative ions, thereby realizing the blowing out of more negative ions and reducing the decrease in negative ion concentration. Another example is that when the conduction duration of the negative ion device becomes longer, the rotation speed of the fan module is reduced to reduce the increase in negative ion concentration and avoid harm to the human body caused by excessive negative ion concentration. By judging whether the working current meets the preset working conditions, when the working current meets the preset working conditions, the rotation speed of the fan module is adjusted in real time to maintain the balance of negative ion concentration, which can effectively remove PM2.5, harmful gases and odor molecules in the air, improve the indoor air quality, and at the same time avoid harm to the human body caused by excessive negative ion concentration.

[0052] In the above embodiment, it is applied to a range hood. The range hood is provided with a negative ion device and a fan module. The fan module is used to drive the negative ions generated by the negative ion device to flow; the negative ion control method of the range hood includes the following steps: obtaining the working current of the negative ion device; when the working current meets the preset working conditions, adjusting the rotation speed of the fan module and the on-off state of the negative ion device to realize the output control of negative ions. In this application, by comparing the working current of the negative ion device with the preset working conditions, and according to the comparison result, by adjusting the rotation speed of the fan module, the fan module can drive the negative ions to flow to ensure effective air purification; adjusting the on-off state of the negative ion device makes the working current of the negative ion device within the normal working current range, avoiding arc bridging of the emitter of the negative ion device, avoiding interference to the control board and even electric shock, and improving the safety of the range hood.

[0053] In one embodiment, as Figure 3As shown, when the working current meets the preset working conditions, the steps of adjusting the rotation speed of the fan module and the on / off state of the negative ion device include:

[0054] Step S310, when the working current is less than the first current threshold, control the fan module to rotate based on the first rotation speed, and control the negative ion device to continuously conduct based on the first control signal.

[0055] Among them, the first rotation speed can be the rotation speed set by the system by default. For example, when the fan module is powered on and started, it rotates based on the first rotation speed. The first control signal can be a high-level signal.

[0056] After turning on the range hood and starting the negative ion device, the fan module starts to operate, collects the working current of the negative ion device, compares the working current with the first current threshold, and based on the comparison result, when the working current is less than the first current threshold, it is determined that the working current of the negative ion device is in the normal current working range, then control the fan module to maintain the first rotation speed to rotate, and at the same time control the negative ion device to continuously conduct based on the first control signal, so that the current loop of the negative ion device continuously conducts, which can effectively remove PM2.5, harmful gases and odor molecules in the air, and improve the indoor air quality.

[0057] Step S320, when the working current is greater than or equal to the first current threshold, adjust the rotation speed of the fan module and the on / off state of the negative ion device.

[0058] By comparing the working current with the first current threshold, if the working current is greater than or equal to the first current threshold, it is determined that the working current of the negative ion device is in the abnormal current working range, adjust the on / off state of the negative ion device, and then adjust the conduction time of the negative ion device, so that the conduction duration of the negative ion device becomes shorter, thereby avoiding the occurrence of arc bridging phenomenon in the negative ion device, preventing interference to the control circuit board, avoiding interference to the control board and even electric shock, and improving the safety of the range hood. At the same time, adjust the rotation speed of the fan module to maintain the balance of the negative ion concentration, which can effectively remove PM2.5, harmful gases and odor molecules in the air, improve the indoor air quality, and at the same time can avoid harm to the human body caused by too high negative ion concentration. For example, when the conduction duration of the negative ion device becomes shorter, increase the rotation speed of the fan module to accelerate the flow of negative ions, thereby realizing blowing out more negative ions and reducing the decrease of the negative ion concentration.

[0059] In one embodiment, as Figure 4 shown, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotation speed of the fan module include:

[0060] Step S410, obtain the current coefficient according to the working current and the first current threshold.

[0061] Among them, the working current is processed by a ratio with the first current threshold value to obtain a current coefficient.

[0062] For example, the output duty ratio of the negative ion device can be adjusted according to the current coefficient. For example, the output voltage of the negative ion device is set to, the input voltage is, and the output duty ratio is D, then D = V OUT / V IN . Set the current coefficient to, then δ i = σD, where σ is a constant.

[0063] Step S420: Adjust the rotation speed of the fan module according to the current coefficient.

[0064] For example, compare the current coefficient with the coefficient threshold value, and adjust the rotation speed of the fan module according to the comparison result to maintain the balance of the negative ion concentration, which can effectively remove PM2.5, harmful gases and odor molecules in the air, improve the indoor air quality, and at the same time avoid harm to the human body caused by excessive negative ion concentration; in addition, the output duty ratio can be changed according to the working current, so that the emission head of the negative ion device cannot have an electric breakdown phenomenon and maintain a normal and stable working state.

[0065] In one example, step S420 includes: when the current coefficient is greater than the first coefficient threshold value, controlling the fan module to rotate based on the first rotation speed; when the current coefficient is less than or equal to the first coefficient threshold value and greater than the second coefficient threshold value, controlling the fan module to rotate based on the second rotation speed; when the current coefficient is less than or equal to the second coefficient threshold value, controlling the fan module to rotate based on the third rotation speed; the third rotation speed is greater than the second rotation speed, and the second rotation speed is greater than the first rotation speed.

[0066] Compare the current coefficient with the coefficient threshold value, and according to the comparison result, when the current coefficient is greater than the first coefficient threshold value, it is determined that the output duty ratio is relatively large, then adjust the rotation speed of the fan module to the first rotation speed, control the fan module to rotate based on the first rotation speed, and remind the user that the negative ion device is in the normal cleaning mode; when the current coefficient is less than or equal to the first coefficient threshold value and greater than the second coefficient threshold value, it is determined that the output duty ratio is relatively small, then increase the rotation speed of the fan module to the second rotation speed, control the fan module to rotate based on the second rotation speed, and remind the user that the negative ion device is in the normal cleaning mode; when the current coefficient is less than or equal to the second coefficient threshold value, it is determined that the output duty is small, then increase the rotation speed of the fan module to the third rotation speed, control the fan module to rotate based on the third rotation speed, and remind the user that the negative ion device is in the normal cleaning mode;

[0067] In the above embodiments, when the working current is greater than or equal to the first current threshold, the on-off state of the negative ion device is adjusted, and the current coefficient is calculated. Then, the rotation speed of the fan module is adjusted according to the current system, so that the loop current of the negative ion device is always within the normal working current range, preventing the occurrence of electrical breakdown at the emission head of the negative ion device. At the same time, when the conduction time of the negative ion device becomes shorter, the rotation speed of the fan module is increased to blow out more negative ions, reducing the decrease in negative ion concentration by physical means.

[0068] In one embodiment, as Figure 5 shown, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotation speed of the fan module and the on-off state of the negative ion device include:

[0069] Step S510, when the working current is greater than or equal to the first current threshold and less than the second current threshold, control the fan module to rotate at the fourth rotation speed, and control the negative ion device to conduct intermittently based on the second control signal; the fourth rotation speed is greater than the first rotation speed.

[0070] For example, the second control signal can be a PWM signal. By comparing the working current with the current threshold, when the working current is greater than or equal to the first current threshold and less than the second current threshold, it is determined that the working current is in the abnormal working range. Then, the rotation speed of the fan module is increased to the fourth rotation speed, and the fan module is controlled to rotate at the fourth rotation speed. A PWM signal is transmitted to the negative ion device, causing the negative ion device to conduct based on the PWM signal, that is, the current circuit of the negative ion device conducts intermittently, and the user is reminded not to touch, and the negative ion device is in the strong output cleaning mode.

[0071] Step S520, when the working current is greater than or equal to the second current threshold and less than the third current threshold, control the fan module to rotate at the fifth rotation speed, and control the negative ion device to conduct intermittently based on the third control signal; the fifth rotation speed is greater than the fourth rotation speed.

[0072] For example, the third control signal can be a pulse signal. By comparing the working current with the current threshold, when the working current is greater than or equal to the second current threshold and less than the third current threshold, it is determined that the working current is in the abnormal working range. Then, the rotation speed of the fan module is increased to the fifth rotation speed, and the fan module is controlled to rotate at the fifth rotation speed. A pulse signal is transmitted to the negative ion device, causing the negative ion device to conduct based on the pulse signal, that is, the current circuit of the negative ion device conducts intermittently, and the user is reminded not to touch, and the negative ion device is in the strong output cleaning mode.

[0073] In the above embodiments, by comparing the working current of the negative ion device with the current threshold, and according to the comparison result, by adjusting the rotation speed of the fan module, the fan module can drive the flow of negative ions to ensure effective air purification; and by adjusting the on / off state of the negative ion device, arc bridging of the emission head of the negative ion device is avoided, interference to the control board and even electric shock are avoided, and the safety of the range hood is improved.

[0074] In one embodiment, as Figure 5 shown, when the working current is greater than or equal to the first current threshold, the steps of adjusting the rotation speed of the fan module and adjusting the on / off state of the negative ion device further include:

[0075] Step S530, when the working current is greater than or equal to the third current threshold, control the fan module to rotate based on the first rotation speed and control the negative ion device to be turned off.

[0076] For example, by comparing the working current with the current threshold, when the working current is greater than or equal to the first current threshold, it is determined that the working current reaches the maximum threshold for warning, then the rotation speed of the fan module is reduced to the first rotation speed, and the fan module is controlled to rotate based on the first rotation speed. And a low-level signal is transmitted to the negative ion device, so that the current loop of the negative ion device is disconnected, and further the emitter of the negative ion device is turned off, which further improves the safety of the range hood.

[0077] It should be understood that although Figures 2 to 5 the steps in the flowchart are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, there is no strict order limit for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 2 to 5 at least a part of the steps in

[0078] In one embodiment, the present application provides a negative ion control device, including:

[0079] A current acquisition unit for acquiring the working current of the negative ion device.

[0080] A negative ion adjustment unit for adjusting the rotation speed of the fan module and the on / off state of the negative ion device when the working current meets the preset working conditions.

[0081] For the specific limitations of the negative ion control device, reference can be made to the limitations of the negative ion control method in the above text, which will not be elaborated here. Each module in the above negative ion control device can be implemented in whole or in part by software, hardware, and their combinations. Each of the above modules can be embedded in the processor of the negative ion control system in hardware form or be independent of it, or can be stored in the memory of the negative ion control system in software form, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0082] In one embodiment, as Figure 6 shown, a range hood negative ion control system is further provided, including a control circuit board 610, a negative ion device 620, and a fan module 630. The control circuit board 610 is respectively connected to the negative ion device 620 and the fan module 630; the control circuit board 610 is used to execute the steps of the range hood negative ion control method as described in any one of the above.

[0083] Among them, the control circuit board 610 is used to control the power on and off of the negative ion device 620. The control circuit board 610 can also be used to control the rotation of the fan module 630; the control circuit board 610 can also be used to sample the working current of the negative ion device 620. The negative ion device 620 is used to generate negative ions; the fan module 630 is used to drive the negative ions generated by the negative ion device 620 to flow.

[0084] Exemplarily, the control circuit board 610 is further used to connect to a display control panel, and the user can control the operating state of the negative ion device 620 through the interaction interface of the display control panel, such as turning on the negative ion, turning off the negative ion, and automatic adjustment of the negative ion.

[0085] The control circuit board 610 can be used to execute the following steps of the range hood negative ion control method: obtain the working current of the negative ion device 620; when the working current meets the preset working conditions, adjust the rotation speed of the fan module 630 and the on-off state of the negative ion device 620 to achieve the output control of the negative ions.

[0086] In the above embodiment, by comparing the working current of the negative ion device 620 with the preset working conditions, and according to the comparison result, by adjusting the rotation speed of the fan module 630, the fan module 630 can drive the negative ions to flow, ensuring effective air purification; adjusting the on-off state of the negative ion device 620 makes the working current of the negative ion device 620 within the normal working current range, avoiding arc bridging of the emitter head of the negative ion device 620, avoiding interference to the control board and even electric shock, and improving the safety of the range hood.

[0087] In one embodiment, as Figure 7As shown, the control circuit board 610 includes a processing chip 612, a switch control circuit 614, and a sampling circuit 616; the processing chip 612 is respectively connected to the fan module 630, the switch control circuit 614, and the sampling circuit 616; the sampling circuit 616 is used to connect to the switch control circuit 614; the switch control circuit 614 is used to connect to the negative ion device 620.

[0088] Among them, as Figure 8 shown, the switch control circuit 614 may include a switching transistor Q1, a first resistor R1, a second resistor R2, and a first capacitor C1; the switching transistor Q1 may be a MOS transistor. The gate of the switching transistor Q1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the signal terminal of the processing chip 612, the drain of the switching transistor Q1 is connected to the first pin of the plug-in terminal J1, the second pin of the plug-in terminal J1 is used to connect to the power supply, the source of the switching transistor Q1 is connected to the sampling circuit 616; the first end of the second resistor R2 is connected to the gate of the switching transistor Q1, the second end of the second resistor R2 is connected to the ground wire; the first end of the first capacitor C1 is connected to the gate of the switching transistor Q1, the second end of the first capacitor C1 is connected to the ground wire. The processing chip 612 can control the on and off of the switching transistor Q1 to turn on and off the negative ion device 620.

[0089] As Figure 8As shown, the sampling circuit 616 may include an operational amplifier U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, and a third capacitor C3; the first end of the third resistor R3 is connected to the source electrode of the switching transistor Q1, the second end of the third resistor R3 is respectively connected to the first end of the third capacitor C3 and the ground wire, the first end of the second capacitor C2 is connected to the sampling terminal of the processing chip 612, the second end of the second capacitor C2 is connected to the ground wire, the first end of the fourth resistor R4 is connected to the output terminal of the operational amplifier U1, the second end of the fourth resistor R4 is connected to the negative input terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the sampling terminal of the processing chip 612, the first end of the fifth resistor R5 is connected to the negative input terminal of the operational amplifier U1, the second end of the fifth resistor R5 is connected to the second end of the third capacitor C3, the first end of the sixth resistor R6 is connected to the positive input terminal of the operational amplifier U1, the second end of the sixth resistor R6 is connected to the first end of the third resistor R3, the first end of the seventh resistor R7 is connected to the power supply, the second end of the seventh resistor R7 is respectively connected to the positive input terminal of the operational amplifier U1 and the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the ground wire. The processing chip 612 samples the working current of the negative ion device 620 through the sampling circuit 616, and then can determine whether the negative ion device 620 is in a normal working state by judging the working current. For example, when the working current of the negative ion device 620 is less than the first current threshold, the negative ion device 620 continuously operates normally; when the working current is greater than or equal to the first current threshold and less than the third current threshold, the current loop of the negative ion device 620 is controlled to conduct intermittently, and the rotation speed of the fan module 630 is adjusted, so that the fan module 630 can drive the negative ions to flow, ensuring effective air purification; at the same time, arc bridging of the emission head of the negative ion device 620 is avoided, interference to the control board and even electric shock are avoided, and the safety of the range hood is improved. When the working current is greater than or equal to the third current threshold, the negative ion device 620 is controlled to turn off, thereby further improving the safety of the range hood.

[0090] In one embodiment, the present application provides a range hood, including a range hood body and the range hood negative ion control system as described above; the range hood negative ion control system is disposed in the range hood body.

[0091] Based on the fact that the negative ion control system of the range hood is set on the range hood body, the negative ion control system of the range hood is connected to the negative ion device and the fan module, and the fan module is used to drive the flow of negative ions generated by the negative ion device; by obtaining the working current of the negative ion device; when the working current meets the preset working conditions, the rotation speed of the fan module is adjusted and the on-off state of the negative ion device is adjusted to achieve the output control of negative ions. In this application, by comparing the working current of the negative ion device with the preset working conditions, and according to the comparison result, by adjusting the rotation speed of the fan module, the fan module can drive the flow of negative ions to ensure effective air purification; by adjusting the on-off state of the negative ion device, the working current of the negative ion device is within the normal working current range, avoiding arc bridging of the emitter head of the negative ion device, avoiding interference to the control board and even electric shock, and improving the safety of the range hood.

[0092] In one embodiment, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above range hood negative ion control methods are implemented.

[0093] For example, when the computer program is executed by a processor, the steps of the following range hood negative ion control method are implemented:

[0094] Obtain the working current of the negative ion device; when the working current meets the preset working conditions, adjust the rotation speed of the fan module and the on-off state of the negative ion device to achieve the output control of negative ions.

[0095] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above division operation methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0096] 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.

[0097] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for controlling negative ions in a range hood, characterized in that: Applied to a range hood, the range hood is provided with a negative ion device and a fan module, the fan module is used to drive the negative ions generated by the negative ion device to flow; the range hood negative ion control method comprises the following steps: Obtaining a working current of the negative ion device; When the working current meets the preset working conditions, the rotation speed of the fan module is adjusted and the on / off state of the negative ion device is adjusted.

2. The method for controlling negative ions in a range hood according to claim 1, characterized in that: When the working current meets the preset working condition, the step of adjusting the rotation speed of the fan module and adjusting the on / off state of the negative ion device includes: When the working current is less than a first current threshold, controlling the fan module to rotate based on a first speed, and controlling the negative ion device to be continuously turned on based on a first control signal; When the working current is greater than or equal to the first current threshold, the rotation speed of the fan module is adjusted, and the on / off state of the negative ion device is adjusted.

3. The method for controlling negative ions in a range hood according to claim 2, characterized in that: When the operating current is greater than or equal to the first current threshold, the step of adjusting the rotation speed of the fan module comprises: Obtaining a current coefficient according to the operating current and the first current threshold; The rotation speed of the fan module is adjusted according to the current coefficient.

4. The method for controlling negative ions in a range hood according to claim 3, characterized in that: The step of adjusting the rotation speed of the fan module according to the current coefficient includes: When the current coefficient is greater than a first coefficient threshold, controlling the fan module to rotate based on a first speed; When the current coefficient is less than or equal to a first coefficient threshold and greater than a second coefficient threshold, controlling the fan module to rotate based on a second speed; When the current coefficient is less than or equal to a second coefficient threshold, the fan module is controlled to rotate based on a third speed; the third speed is greater than the second speed, and the second speed is greater than the first speed.

5. The method for controlling negative ions in a range hood according to claim 2, characterized in that: When the working current is greater than or equal to the first current threshold, the steps of adjusting the rotation speed of the fan module and adjusting the on / off state of the negative ion device include: When the working current is greater than or equal to the first current threshold and less than the second current threshold, the fan module is controlled to rotate based on a fourth speed, and the negative ion device is controlled to be intermittently turned on based on a second control signal; the fourth speed is greater than the first speed; When the working current is greater than or equal to the second current threshold and less than the third current threshold, the fan module is controlled to rotate based on a fifth speed, and the negative ion device is controlled to be intermittently turned on based on a third control signal; the fifth speed is greater than the fourth speed.

6. The method for controlling negative ions in a range hood according to claim 5, characterized in that: When the working current is greater than or equal to the first current threshold, the step of adjusting the rotation speed of the fan module and adjusting the on / off state of the negative ion device also includes: When the working current is greater than or equal to a third current threshold, the fan module is controlled to rotate based on a first speed, and the negative ion device is controlled to be turned off.

7. The method for controlling negative ions in a range hood according to claim 5, characterized in that: The second control signal is a PWM signal, and the third control signal is a pulse signal.

8. A range hood negative ion control system, characterized in that: It includes a control circuit board, a negative ion device and a fan module, wherein the control circuit board is connected to the negative ion device and the fan module respectively; The control circuit board is used to execute the steps of the range hood negative ion control method as described in any one of claims 1 to 7.

9. The negative ion control system for range hood according to claim 8, characterized in that: The control circuit board includes a processing chip, a switch control circuit and a sampling circuit; The processing chip is respectively connected to the fan module, the switch control circuit and the sampling circuit; the sampling circuit is used to connect to the switch control circuit; and the switch control circuit is used to connect to the negative ion device.

10. A range hood, characterized in that: It comprises a range hood body and the range hood negative ion control system as claimed in claim 8 or 9; the range hood negative ion control system is arranged on the range hood body.

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