Sorption ironing device and method of operation thereof

Abstract

The application discloses an adsorption type ironing device and a working method thereof, and belongs to the technical field of clothes ironing. The prior art sets different gears for a suction device for users to select according to requirements, which is large in operation burden and prone to erroneous operation. The application comprises a micro control unit which automatically controls three-phase lines to provide required driving current for a motor according to current signals collected by a sampling module, and further controls the rotating speed of the motor. When the motor is idle, the motor rotates at a first rotating speed n1; when low-density clothes are adsorbed, the motor rotates at a second rotating speed n2; when medium-density clothes are adsorbed, the motor rotates at a third rotating speed n3; and when high-density clothes are adsorbed, the motor rotates at a fourth rotating speed n4; and n1 < n3 < n2, and n4 < n3 < n2. Therefore, for clothes with different densities, since the air permeability of the clothes is different, the clothes can be adsorbed by rotating the motor at different rotating speeds, so that the clothes on both sides can keep a proper pressure difference, and thus clothes with different air permeabilities can be adsorbed.

Description

Technical Field

[0001] This invention pertains to garment ironing technology, specifically relating to an adsorption iron and its working method. Background Technology

[0002] When ironing clothes with a handheld steamer, the released steam can blow the clothes away from the work surface, hindering the ironing process. This drawback can be overcome by using an air suction device to draw the clothes towards the work surface through suction holes distributed across the surface during steam ironing. However, ideally, the clothes should be precisely drawn into the steam, preventing them from being blown away and allowing the steamer to move easily over the fabric. However, the air suction devices on existing handheld steamers typically operate in a single mode, making it difficult to precisely draw in clothes with varying breathability. For example, when the air suction device is set (calibrated) to precisely draw in medium-density, medium-breathability clothing (such as cotton and linen), a suitable pressure difference is maintained across the garment, resulting in appropriate suction. However, when this calibrated device draws in low-density, highly breathable clothing (such as lace and gauze), the pressure difference is smaller, resulting in weaker suction and insufficient absorption. When such a calibrated suction device adsorbs high-density, low-breathability clothing (such as silk, synthetic fabrics, etc.), the pressure difference between the two sides of the clothing is large, the suction force is strong, which is not conducive to the iron moving on the surface of the clothing.

[0003] Offering different suction levels for users to choose from overcomes the shortcomings of setting (calibrating) the suction device to a single state. However, switching levels as needed increases the user's workload. Furthermore, not all users can accurately switch the suction device to the desired level; incorrect switching can result in poor ironing results for the clothes being ironed, reducing the user's ironing experience and evaluation of the iron. Summary of the Invention

[0004] This invention addresses the shortcomings of existing handheld irons, such as the difficulty in accurately adsorbing clothing with different breathability due to the air suction device being calibrated to operate in one state, and the high operational burden and easy error caused by setting different air suction levels for users to choose according to their needs. The invention provides an adsorption iron and its working method.

[0005] To achieve the above objectives, the adsorption-type iron of the present invention includes an air suction device for assisting steam ironing, characterized in that the air suction device comprises: Power supply, which powers the intake device; A fan uses an electric motor to drive a fan wheel to rotate, thereby drawing in air. A microcontroller unit, which includes a sampling module; The three phase lines are controlled by the microcontroller to provide drive current to the motor; The sampling resistor is used by the sampling module to acquire the current signal. in, The microcontroller unit automatically controls the three phase lines to provide the required drive current to the motor based on the current signal collected by the sampling module, thereby controlling the motor speed.

[0006] This suction-type iron is automatically controlled by a microcontroller unit using current signals collected by a sampling module to provide the necessary drive current to the motor via three phase lines. This allows the motor to rotate at different speeds to adapt to the suction device precisely adsorbing the clothes being ironed.

[0007] Among them, the sampling resistor has a more accurate resistance value, and the sampling module collects the current signal of the sampling resistor instead of the current signal of the motor, so that the collected signal is accurate and has small fluctuations.

[0008] Preferably, in order to ensure the motor life and reduce the motor rotation noise, the motor is a brushless DC motor, and in order to facilitate the provision of drive current to the motor, each phase line is composed of two field-effect transistors controlled by the intelligent power module.

[0009] Preferably, the microcontroller is connected to each phase line with an output resistor for driving the field-effect transistor, and the microcontroller is connected to the three phase lines with an input resistor for use in the internal comparator module circuit of the microcontroller.

[0010] Preferably, the microcontroller includes a comparison module. The current signal collected by the sampling module is compared by the comparison module, and the microcontroller controls the three phase lines to provide the required drive current to the motor based on the comparison result.

[0011] Preferably, the sampling resistor is connected between the three phase lines and the power supply. This is used to accurately reflect the motor's drive current.

[0012] The working method of the adsorption iron of the present invention is as follows: A microcontroller automatically commands the motor of the fan to rotate at different speeds according to the working state of the adsorption iron. The working state includes an idle state and an adsorption state. The adsorption state includes at least two of the following states: adsorbing low-density clothing, adsorbing medium-density clothing, and adsorbing high-density clothing. (1) When the fan is unloaded, make the motor rotate at the first speed n1; (2) When adsorbing low-density clothing, make the fan motor rotate at the second speed n2; (3) When adsorbing medium-density clothing, make the fan motor rotate at the third speed n3; (4) When adsorbing high-density clothing, make the fan motor rotate at the fourth speed n4; Furthermore, n1 < n3 < n2, n4 < n3 < n2.

[0013] Based on this working method, the motor rotates at a low speed when unloaded, reducing starting noise and allowing room for subsequent adjustments. For garments of different densities, due to variations in breathability, rotating the motor at different speeds maintains a suitable pressure difference across the garment, ensuring that fabrics with varying breathability are effectively absorbed. Furthermore, since the motor speed changes are automatically controlled by a microcontroller, users do not need to switch speeds as needed. This eliminates the need for manual speed adjustments, making it more convenient and preventing operational errors that could reduce ironing effectiveness and experience, thus maintaining the iron's positive user evaluation.

[0014] Preferably, n1 = n4.

[0015] Preferably, n1 = 30000rpm ± 10000rpm, n2 = 70000rpm ± 15000rpm, n3 = 50000rpm ± 10000rpm, and n4 = 30000rpm ± 10000rpm.

[0016] Preferably, after the motor starts, it rotates at a first speed n1. When the motor is in an unloaded state, the average current I0 of the sampling resistor is collected and recorded. Then, the absolute value of the current I_avg and the rate of change of current dI / dt of the sampling resistor are collected in real time, and the motor is instructed to rotate at the corresponding speed under the following conditions: (1) If I_avg≤I0×1.05 and dI / dt does not exceed the threshold, then the motor is judged to be in no-load state, and the motor of the fan is made to rotate at the first speed n1; (2) If I_avg > I0 × 1.05 or dI / dt exceeds the threshold when detected from the no-load state, it is determined that the motor is in the adsorption state, and (2.1) If I0×1.05<I_avg≤I0×1.3 is detected, it is determined that the motor is in the state of adsorbing low-density clothing, and the motor of the fan is made to rotate at the second speed n2; (2.2) If I0×1.3<I_avg≤I0×1.8 is detected, it is determined that the motor is in the state of adsorbing medium-density clothing, and the motor of the fan is made to rotate at the third speed n3; (2.3) If I_avg>I0×1.8 is detected, it is determined that the motor is in the state of adsorbing high-density clothing, and the motor of the fan is made to rotate at the fourth speed n4; (3) If I_avg≤I0×1.05 is detected from the adsorption state, it is determined that the motor is in an unloaded state, and the motor of the fan is restored to the first speed n1.

[0017] Therefore, by collecting the absolute value of the current I_avg and the rate of change of the current dI / dt of the sampling resistor in real time, the working state of the motor can be determined, and the motor can be instructed to rotate at the corresponding speed to precisely absorb clothing with different breathability.

[0018] Preferably, the threshold for dI / dt is 0.05A / s ± 0.01A / s.

[0019] Preferably, to avoid transient noise and current oscillations during speed changes, the speed switching time between the first speed n1 and the second speed n2, and the speed switching time between the first speed n1 and the third speed n3, are controlled by the ramp change rate to be 2-5 seconds. Specifically, the ramp change rate is 10000±5000 rpm / s.

[0020] This invention utilizes a microcontroller unit to automatically control the three phase lines to provide the required drive current to the motor based on the current signal collected by the sampling module, thereby controlling the motor speed. Furthermore, the microcontroller unit automatically instructs the fan motor to rotate at different speeds based on the working state of the adsorption iron. The working state includes an unloaded state and an adsorption state. The adsorption state includes at least two of the following: adsorbing low-density clothing, adsorbing medium-density clothing, and adsorbing high-density clothing. Specifically: (1) When unloaded, the fan motor rotates at a first speed n1; (2) When adsorbing low-density clothing, the fan motor rotates at a second speed n2; (3) When adsorbing medium-density clothing, the fan motor rotates at a third speed n3; (4) When adsorbing high-density clothing, the fan motor rotates at a fourth speed n4; and n1 < n3 < n2, n4 < n3 < n2. Therefore, when unloaded, the motor rotates at a low speed, reducing starting noise and reserving space for subsequent adjustments. For garments of different densities, whose breathability varies, varying motor speeds maintain a suitable pressure difference across the garment, ensuring that fabrics with different breathability are effectively absorbed. Furthermore, since the motor speed is automatically controlled by a microcontroller, users don't need to switch speeds manually, making it more convenient and preventing operational errors that could reduce ironing effectiveness and experience, thus maintaining the ironer's positive user evaluation. Attached Figure Description

[0021] Figure 1 This is a block diagram showing the structure of the suction device of the adsorption iron of the present invention; Figure 2 This is a circuit diagram of the suction device of the present invention; Figure 3 This is a flowchart of the working method of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] The terms “comprising” and “having”, and any variations thereof, used in the specification and claims of this invention are intended to cover a non-exclusive inclusion, such as a method or product that includes a series of technical features, not necessarily limited to those technical features explicitly listed, but may also include other technical features that may be included in the method or product but not explicitly listed.

[0024] In the description of this invention, it should be understood that the technical features defined by terms such as "first," "second," "third," and "fourth," which have a sequential concept, are only used to clearly describe the defined technical features and to clearly distinguish the defined technical features from other technical features, and do not represent that they are named in this way in actual implementation. Therefore, they should not be construed as limitations on this invention.

[0025] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0026] Figure 1-2 The suction device of an adsorption iron is shown. This suction device assists in steam ironing; when the handheld iron releases steam through the steam holes on the working surface to iron clothes, the suction device draws the clothes towards the working surface through the suction holes distributed on the working surface. The suction device includes a power supply 100, a fan 200, a microcontroller unit 300, three phase lines 400, and a sampling resistor.

[0027] Power supply 100 supplies power to the suction device. Generally, the power supply powers the entire handheld iron and is provided via a power cord for connecting to an external power source during use. Preferably, the handheld iron is equipped with a rechargeable battery, allowing the iron to operate even when the power cord is disconnected. The external AC power is typically converted to DC power.

[0028] The fan 200 uses a motor to drive the impeller to rotate, thereby drawing in air.

[0029] The microcontroller unit 300 includes a sampling module.

[0030] The three-phase line 400 is controlled by a microcontroller unit to provide drive current to the motor.

[0031] The sampling resistor is used by the sampling module to collect current signals.

[0032] The microcontroller unit automatically controls the three phase lines to provide the required drive current to the motor based on the current signal collected by the sampling module, thereby controlling the motor speed.

[0033] This suction-type iron uses a microcontroller unit that automatically controls the three phase lines to provide the necessary drive current to the motor via a current signal collected by a sampling module. This allows the motor to rotate at different speeds to adapt to the suction device precisely adsorbing the clothes being ironed. Because the sampling resistor has a more precise resistance value, the sampling module collects the current signal from the sampling resistor rather than the motor's current signal, resulting in accurate and low-fluctuation signals.

[0034] The above structure embodies the basic concept of the suction device of the present invention, enabling the implementation of the suction device of the present invention. To further improve this technical solution, based on the above structure, the following preferred technical means can be selected to obtain a better embodiment of the suction device.

[0035] To ensure motor lifespan and reduce motor noise, a brushless DC motor is used. To facilitate the supply of drive current to the motor, each phase line consists of two MOSFETs 401 controlled by the intelligent power module 402. In other words, the brushless DC motor is controlled via MOSFETs.

[0036] The microcontroller is connected to each phase line with an output resistor to drive the field-effect transistor, and the microcontroller is connected to the three phase lines with an input resistor for use in the internal comparator module circuit of the microcontroller.

[0037] The microcontroller unit includes a comparison module. The current signal collected by the sampling module is compared by the comparison module, and the microcontroller unit controls the three phase lines to provide the required drive current to the motor based on the comparison result.

[0038] The sampling resistor is connected between the three phase lines and the power supply. It is used to accurately reflect the motor's drive current.

[0039] The working method of the adsorption iron of the present invention is as follows: A microcontroller automatically commands the fan motor to rotate at different speeds according to the working state of the adsorption iron. The working state includes an idle state and an adsorption state. The adsorption state includes at least two of the following states: adsorbing low-density clothing, adsorbing medium-density clothing, and adsorbing high-density clothing. (1) When the fan is unloaded, make the motor rotate at the first speed n1; (2) When adsorbing low-density clothing, make the fan motor rotate at the second speed n2; (3) When adsorbing medium-density clothing, make the fan motor rotate at the third speed n3; (4) When adsorbing high-density clothing, make the fan motor rotate at the fourth speed n4; Furthermore, n1 < n3 < n2, n4 < n3 < n2.

[0040] Based on this working method, the motor rotates at a low speed when unloaded, reducing starting noise and allowing room for subsequent adjustments. For garments of different densities, due to variations in breathability, rotating the motor at different speeds maintains a suitable pressure difference across the garment, ensuring that fabrics with varying breathability are effectively absorbed. Furthermore, since the motor speed changes are automatically controlled by a microcontroller, users do not need to switch speeds as needed. This eliminates the need for manual speed adjustments, making it more convenient and preventing operational errors that could reduce ironing effectiveness and experience, thus maintaining the iron's positive user evaluation.

[0041] Furthermore, n1 = n4. n1 = 30000rpm ± 10000rpm, n2 = 70000rpm ± 15000rpm, n3 = 50000rpm ± 10000rpm, n4 = 30000rpm ± 10000rpm.

[0042] like Figure 3 As shown, after the motor starts, it rotates at the first speed n1. The motor is in an unloaded state. The average current I0 of the sampling resistor is collected and recorded when it is in an unloaded state. Then, the absolute value of the current I_avg and the rate of change of current dI / dt of the sampling resistor are collected in real time, and the motor is instructed to rotate at the corresponding speed under the following conditions: (1) If I_avg≤I0×1.05 and dI / dt does not exceed the threshold, then the motor is judged to be in no-load state, and the motor of the fan is made to rotate at the first speed n1; (2) If I_avg > I0 × 1.05 or dI / dt exceeds the threshold when detected from the no-load state, it is determined that the motor is in the adsorption state, and (2.1) If I0×1.05<I_avg≤I0×1.3 is detected, it is determined that the motor is in the state of adsorbing low-density clothing, and the motor of the fan is made to rotate at the second speed n2; (2.2) If I0×1.3<I_avg≤I0×1.8 is detected, it is determined that the motor is in the state of adsorbing medium-density clothing, and the motor of the fan is made to rotate at the third speed n3; (2.3) If I_avg>I0×1.8 is detected, it is determined that the motor is in the state of adsorbing high-density clothing, and the motor of the fan is made to rotate at the fourth speed n4; (3) If I_avg≤I0×1.05 is detected from the adsorption state, it is determined that the motor is in an unloaded state, and the motor of the fan is restored to the first speed n1.

[0043] Therefore, by collecting the absolute value of the current I_avg and the rate of change of the current dI / dt of the sampling resistor in real time, the working state of the motor can be determined, and the motor can be instructed to rotate at the corresponding speed to precisely absorb clothing with different breathability.

[0044] Specifically, the threshold for dI / dt is 0.05A / s ± 0.01A / s.

[0045] To avoid transient noise and current oscillations during speed changes, the speed switching time between the first speed n1 and the second speed n2, and the speed switching time between the first speed n1 and the third speed n3, are controlled by the ramp change rate to 2-5 seconds. Specifically, the ramp change rate is 10000±5000 rpm / s.

[0046] This invention uses the current signal associated with a brushless DC motor (BLDC) as the core basis for fabric density sensing, achieving adaptive speed control without additional sensors and with a simple program. The system defaults to a first speed n1 (30000 rpm) as the starting point, and uses a finite state machine to combine the sampled absolute current value (I_avg) and current change rate (dI / dt) for real-time judgment, automatically matching no-load, low-density, medium-density, and high-density fabric scenarios. The core principle is based on the fan load characteristics: changes in fabric wind resistance are directly mapped to changes in motor torque and current (P=U·I=T·ω, where P is the motor power, U is the motor operating voltage, I is the motor operating current, T is the motor output torque, and ω is the angular velocity of the motor rotation), thus achieving "sensing as adjustment".

[0047] I. System Initialization and Reference Calibration Default power-on state: After the iron is powered on, the motor immediately enters no-load state (NO_LOAD), and the target speed is set to n_ref=30000rpm.

[0048] No-load current reference calibration: Run for 1-2 seconds without fabric adsorption and record the average current I0. The average current I0 is used as the reference for all subsequent thresholds.

[0049] Sampling mechanism: Bus / phase current is acquired every 1-5ms via analog-to-digital converter (ADC), and I_avg is obtained by averaging through a sliding window (window 50-200ms). At the same time, the current change rate dI / dt is calculated (to capture transient adsorption events).

[0050] II. Detailed speed change logic for each operating state The system uses a finite state machine to distinguish between an unloaded state (NO_LOAD) and an adsorption state (ADSORBING). In the adsorption state, the fabric density is further subdivided according to the current range.

[0051] 1. Unloaded state (no fabric adsorption) Speed: Fixed at the first speed n1 (e.g., 30000rpm). The first speed n1 is the default low speed, which reduces starting noise and leaves room for subsequent adjustments.

[0052] Current characteristics: I_avg≤I0×1.05 (minimum reference level).

[0053] Judgment conditions: The system continuously monitors, and if I_avg is always ≤ I0×1.05 and dI / dt does not exceed the threshold (0.05A / s), then it remains in an unloaded state.

[0054] Objective: To minimize power consumption and noise while waiting for the fabric to approach.

[0055] 2. It adsorbs low-density fabrics (such as lace, gauze, etc.) with minimal wind resistance. Rotation speed: Automatically increases to the second rotation speed n2 (e.g., 70000 rpm). This second rotation speed n2 is the maximum rotation speed, compensating for air permeability loss and generating a sufficient pressure difference ΔP, where ΔP ∝ n², and n is the rotation speed.

[0056] Current characteristics: I_avg rises only slightly (I0×1.05<I_avg≤I0×1.3).

[0057] Judgment criteria: When the dI / dt exceeds the threshold (>0.05A / s) or I_avg exceeds I0×1.05 from the unloaded state, it immediately enters the adsorption state and is classified as low density.

[0058] Key solution: The absolute value of current alone can be easily confused with no-load conditions. Therefore, the rate of change of current and finite state machine switching are introduced to ensure that the "fabric approach" event is reliably captured. As a result, the response time is short (<200ms).

[0059] 3. Adsorbs medium-density fabrics (such as cotton and linen, with moderate wind resistance). Speed: Automatically adjusts to the third speed n3 (e.g., 50000rpm), at which speed balances suction and noise.

[0060] Current characteristics: I0×1.3<I_avg≤I0×1.8.

[0061] Judgment criteria: After entering the adsorption state, it is directly classified as medium density according to I_avg, and n_ref=n3 (50000rpm).

[0062] 4. It adsorbs high-density fabrics (such as silk and synthetic fibers), resulting in the greatest wind resistance. Rotation speed: Maintain a constant fourth rotation speed n4 (specifically, n4 can be n1, such as 30000 rpm, the minimum rotation speed, to achieve stable adsorption and avoid over-adsorption or excessive noise).

[0063] Current characteristics: I_avg>I0×1.8 (current increases significantly).

[0064] Judgment criteria: After entering the adsorption state, it is directly classified as high density according to I_avg, and n_ref=n4 (n4=n1=30000rpm).

[0065] 5. Fabric removal detection When I_avg falls below I0×1.05, it automatically switches back to no-load state and restores to the first speed n1 (30000rpm).

[0066] III. Advantages of the Solution and Key Points of Project Implementation User experience: No manual gear selection is required; one-button start automatically matches the optimal suction power and speed, significantly superior to fixed-speed products on the market.

[0067] Performance optimization: At high density, low speed reduces noise by 5-9dB (noise level is related to speed by n², where n is the speed), and at low density, high speed increases suction by 20-40%; overall power consumption is more reasonable.

[0068] Program complexity: Only a dozen or so lines of core code are required, with extremely low computational load, making it suitable for low-cost MCUs (such as the STM32G4 series).

[0069] Calibration and verification: I_avg-density curves were plotted using real fabric samples, and the threshold was fine-tuned; during the prototype stage, state switching was recorded via serial port logs to ensure that the low-density trigger accuracy was >95%.

[0070] Scalability: It can be further upgraded to a constant power outer loop (P_target) to achieve more precise "constant suction" control; the hysteresis delay (100ms) is increased to enhance anti-interference capability.

[0071] IV. Motor Speed ​​Switching Strategy The speed switching (including increasing and decreasing speed) between the first speed n1 and the second speed n2, and between the first speed n1 and the third speed n3 of the motor should not be completed instantaneously, but rather with a delay, which is achieved through the ramp rate of change.

[0072] 1. Slope change rate In the field of electronic control and in this application, the ramp rate is a key parameter for handling the smoothness of motor speed regulation. It refers to how quickly the motor speed changes over time. In code, it is usually a limit value to prevent the target speed from abruptly changing between the first speed n1 and the second speed n2, or between the first speed n1 and the third speed n3. In other words, the ramp rate is the "acceleration" of the speed change over time, and its magnitude determines the time required for speed switching between the first speed n1 and the second speed n2, and between the first speed n1 and the third speed n3.

[0073] 2. Logical relationship between slope change rate and I_avg, dI / dt The rate of change of the slope, along with I_avg and dI / dt, plays different roles in the control system, constituting the "trigger". determination The closed loop of "execution": (1) dI / dt (rate of change of current) is a trigger. Relationship: dI / dt is the "switch" that triggers the slope change.

[0074] Logic: When a sudden increase in dI / dt is detected (e.g., greater than 0.05 A / s), it means that the suction device has just begun to adsorb the clothing (the suction nozzle of the suction device has just come into contact with the fabric). At this time, the system immediately determines that "the state has changed" and issues a "change speed" command to the microcontroller unit.

[0075] Function: dI / dt determines the sensitivity of the system response.

[0076] (2) I_avg (average current) is the target Relationship: I_avg determines how high the slope will eventually "climb".

[0077] Logic: The system determines the density of the clothing (high density, medium density, low density) based on the value of I_avg. The determination result will provide a target rotational speed n_ref.

[0078] Function: Determines the accuracy of speed regulation.

[0079] (3) The slope change rate implements the buffering mechanism. Relationship: It is the way to transition to the target value corresponding to I_avg after dI / dt triggering.

[0080] logic: 3.1 Adsorption action was captured by dI / dt.

[0081] 3.2 I_avg points to the target rotational speed.

[0082] 3.3 The ramp rate of change is controlled to smoothly transition the motor to this target, rather than a step change.

[0083] 3. The significance of the rate of change of slope Determining the instantaneous jump speed directly based on the current without using the ramp rate of change will lead to the following engineering problems: (1) Current surge: The sudden change in speed can cause a surge in reverse electromotive force or bus current, which may burn out the power transistor or trigger the overcurrent protection.

[0084] (2) Sudden noise change: Users will hear the motor suddenly "scream" or "muffled" and feel very cheap. The slope change makes the sound sound like a natural transition.

[0085] (3) Feedback oscillation: 3.1 Current I is affected by rotational speed P=UI (P is the motor output power, U is the voltage applied to the motor).

[0086] 3.2 If the rotation speed changes abruptly, the current I will also fluctuate violently.

[0087] 3.3 Since I_avg and dI / dt are the basis for the judgment, the random fluctuation of the rotation speed will cause the judgment logic to fall into an infinite loop (constantly switching between different densities).

[0088] 3.4 The slope change rate acts as a "low-pass filter," allowing the system to maintain physical stability during the adjustment process.

[0089] Therefore, dI / dt tells the system "it should change!" I_avg tells the system "how much should it change to?" Does the rate of change of the slope specify "how fast it needs to change to be stable"? In actual use cases of irons, response speed is directly related to the user's perception of "intelligence".

[0090] 1. Theoretical calculation time Taking a ramp change rate of 500 rpm / s as an example, the time required to complete a speed change of 20,000 rpm (50,000 rpm - 30,000 rpm = 20,000 rpm) is 20,000 / 500 = 40 seconds (20,000 / 500 = 40).

[0091] If the ramp change rate is 500 rpm / s, switching from no load (first speed n1 = 30000 rpm) to adsorbing medium-density fabric (third speed n3 = 50000 rpm) takes 40 seconds, which is completely unacceptable for user experience. Therefore, a ramp change rate of 10000 ± 5000 rpm / s can control the speed switching time between the first speed n1 and the second speed n2, and between the first speed n1 and the third speed n3, to 2-5 seconds. This achieves a balance between "user experience" and "system stability".

[0092] Furthermore, instead of using a fixed rate of change, a design similar to an acceleration curve is adopted: Judgment phase (e.g., the first second): Detects changes in dI / dt and confirms that I_avg has entered the new interval.

[0093] Rapid leap (e.g., 3 seconds in the middle): Approach the target speed quickly with a large slope (e.g., 10,000 rpm / s - 150,000 rpm / s).

[0094] Smooth entry (e.g., in the last second): When approaching the target speed, reduce the slope to smoothly lock onto the target and avoid overshoot.

[0095] 2. Resolving the conflict between "response speed" and "false positives". To prevent system oscillations caused by increasing the rate of change of the slope, the following adjustments can be made to the algorithm: Decision Lock: Once the system determines the switch from "high density" to "medium density" via I_avg, the decision result is locked within 5 seconds of speed adjustment to prevent transient current fluctuations from interfering with the speed regulation process.

[0096] Preset power compensation: At the moment of ramp start, the duty cycle of pulse-width modulation (PWM) is compensated to offset the extra inertial current generated by motor acceleration.

Claims

1. An adsorption iron, including an air suction device for assisting steam ironing, characterized in that: The air intake device includes: Power supply (100), which supplies power to the suction device; The fan (200) uses a motor to drive the impeller to rotate and achieve air intake; A microcontroller unit (300) includes a sampling module; The three phase lines (400) are controlled by the microcontroller to provide drive current to the motor; The sampling resistor (R3) is used by the sampling module to acquire the current signal. in, The microcontroller unit automatically controls the three phase lines to provide the required drive current to the motor based on the current signal collected by the sampling module, thereby controlling the motor speed.

2. The adsorption-type iron according to claim 1, characterized in that: The motor is a brushless DC motor, and each phase line (400) consists of two field-effect transistors (401) controlled by the intelligent power module (402).

3. The adsorption-type iron according to claim 1, characterized in that: The microcontroller is connected to each phase line via an output resistor (R1), and the microcontroller is connected to the three phase lines via an input resistor (R2).

4. The adsorption-type iron according to claim 3, characterized in that: The microcontroller unit includes a comparison module. The current signal collected by the sampling module is compared by the comparison module, and the microcontroller unit controls the three phase lines to provide the required drive current to the motor based on the comparison result.

5. The adsorption-type iron according to claim 1, characterized in that: The sampling resistor (R3) is connected between the three phase lines and the power supply.

6. The working method of an adsorption iron, characterized by: The microcontroller unit automatically commands the fan motor to rotate at different speeds based on the working state of the adsorption iron. The working state includes an idle state and an adsorption state. The adsorption state includes at least two of the following: adsorbing low-density clothing, adsorbing medium-density clothing, and adsorbing high-density clothing. (1) When the fan is unloaded, make the motor rotate at the first speed n1; (2) When adsorbing low-density clothing, make the fan motor rotate at the second speed n2; (3) When adsorbing medium-density clothing, make the fan motor rotate at the third speed n3; (4) When adsorbing high-density clothing, make the fan motor rotate at the fourth speed n4; Furthermore, n1 < n3 < n2, n4 < n3 < n2.

7. The working method according to claim 6, characterized in that: n1 = n4.

8. The working method according to claim 6 or 7, characterized in that: n1=30000rpm±10000rpm, n2=70000rpm±15000rpm, n3=50000rpm±10000rpm, n4=30000rpm±10000rpm.

9. The working method according to claim 6, characterized in that: After the motor starts, it rotates at the first speed n1. The motor is in an unloaded state. The average current I0 of the sampling resistor is collected and recorded when the motor is in an unloaded state. Then, the absolute value of the current I_avg and the rate of change of current dI / dt of the sampling resistor are collected in real time, and the motor is instructed to rotate at the corresponding speed under the following conditions: (1) If I_avg≤I0×1.05 and dI / dt does not exceed the threshold, then the motor is judged to be in no-load state, and the motor of the fan is made to rotate at the first speed n1; (2) If I_avg > I0 × 1.05 or dI / dt exceeds the threshold when detected from the no-load state, it is determined that the motor is in the adsorption state, and (2.1) If I0×1.05<I_avg≤I0×1.3 is detected, it is determined that the motor is in the state of adsorbing low-density clothing, and the motor of the fan is made to rotate at the second speed n2; (2.2) If I0×1.3<I_avg≤I0×1.8 is detected, it is determined that the motor is in the state of adsorbing medium-density clothing, and the motor of the fan is made to rotate at the third speed n3; (2.3) If I_avg>I0×1.8 is detected, it is determined that the motor is in the state of adsorbing high-density clothing, and the motor of the fan is made to rotate at the fourth speed n4; (3) If I_avg≤I0×1.05 is detected from the adsorption state, it is determined that the motor is in an unloaded state, and the motor of the fan is restored to the first speed n1.

10. The working method according to claim 9, characterized in that: The threshold for dI / dt is 0.05A / s ± 0.01A / s.

11. The working method according to claim 6 or 9, characterized in that: The speed switching time between the first speed n1 and the second speed n2, and the speed switching time between the first speed n1 and the third speed n3, are controlled by the ramp change rate to be 2-5 seconds.

12. The working method according to claim 11, characterized in that: The slope change rate is 10000±5000 rpm / s.

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