Control circuit of motor of steam iron and steam iron

Abstract

The application provides a control circuit of a motor of a steam iron and the steam iron. The control circuit of the motor of the steam iron comprises an AC / DC unit, a voltage conversion unit and a DC / DC unit; the AC / DC unit is connected with the DC / DC unit; the voltage conversion unit is connected with the DC / DC unit; the voltage conversion unit and the DC / DC unit are connected with the motor; the AC / DC unit is used for delivering voltage to the DC / DC unit and delivering voltage to the voltage conversion unit through the DC / DC unit; the voltage conversion unit is used for receiving a first voltage signal of the motor and outputting a modulation signal to the DC / DC unit based on the first voltage signal; wherein the first voltage signal represents the current voltage of the motor; the DC / DC unit outputs a second voltage signal to the motor based on the modulation signal; wherein the second voltage signal is the voltage delivered to the motor. The low-speed brush motor driving scheme with higher rotating speed and power output is used to improve the adsorption performance of the steam iron.

Description

Technical Field

[0001] This utility model relates to the field of vacuum steamers, and more particularly to a control circuit for the motor of a vacuum steamer and the vacuum steamer itself. Background Technology

[0002] A vacuum steamer is a professional steaming device that uses negative pressure to adhere and fix fabrics while removing hot and humid steam during ironing. Currently, vacuum steamers that use low-speed brushed motors as their power source suffer from insufficient vacuum levels due to the low output speed and limited power of these motors under rated operating conditions. This results in the vacuum levels generated by the steamer being insufficient to meet the process requirements for stable fabric adhesion during actual steaming.

[0003] Therefore, there is an urgent need for a low-speed brushed motor drive solution that can achieve higher speed and power output to improve the suction performance of the vacuum cleaner and meet the needs of efficient vacuuming operations. Utility Model Content

[0004] This application provides a control circuit for the motor of a vacuum steamer and a vacuum steamer, which is a low-speed brushed motor drive scheme to achieve higher speed and power output, so as to improve the suction performance of the vacuum steamer and meet the needs of efficient vacuum steaming operations.

[0005] On one hand, this application provides a control circuit for the motor of a vacuum iron, including:

[0006] The control circuit includes: an AC / DC unit, a voltage conversion unit, and a DC / DC unit; wherein the AC / DC unit is connected to the DC / DC unit; the voltage conversion unit is connected to the DC / DC unit; and both the voltage conversion unit and the DC / DC unit are connected to the motor.

[0007] The AC / DC unit is used to supply voltage to the DC / DC unit and to supply voltage to the voltage conversion unit through the DC / DC unit;

[0008] The voltage conversion unit is used to receive a first voltage signal from the motor and output a modulation signal to the DC / DC unit based on the first voltage signal; wherein, the first voltage signal represents the current voltage of the motor;

[0009] The DC / DC unit outputs a second voltage signal to the motor based on the modulation signal; wherein the second voltage signal is the voltage supplied to the motor.

[0010] In one possible implementation, the voltage conversion unit includes a microprocessor, a first voltage receiving module, a second voltage receiving module, a third voltage receiving module, and a grounding module;

[0011] A first terminal of the first voltage receiving module is connected to the DC / DC unit; a second terminal of the first voltage receiving module is connected to the microprocessor; a third terminal of the first voltage receiving module is connected to the first terminal of the second voltage receiving module; a second terminal of the second voltage receiving module is connected to the motor; a first terminal of the third voltage receiving module is connected to the microprocessor; a second terminal of the third voltage receiving module is connected to the motor; a grounding module is connected to the microprocessor and is grounded; the microprocessor is connected to the DC / DC unit.

[0012] The first voltage receiving module is used to transmit the voltage delivered by the DC / DC unit to the microprocessor when a second voltage signal needs to be provided to the motor;

[0013] The second voltage receiving module is used to supply voltage to the microprocessor for power supply when the first voltage receiving module stops working;

[0014] The microprocessor is used to receive the first voltage signal transmitted by the third voltage receiving module, and output the modulation signal to the DC / DC unit based on the first voltage signal.

[0015] In one possible implementation, the first voltage receiving module includes a first diode and a first capacitor connected in parallel; wherein the first capacitor is grounded, and the first diode is connected to the DC / DC unit, the microprocessor, and a first terminal of the second voltage receiving module.

[0016] In one possible implementation, the second voltage receiving module includes a first resistor and a second diode connected in series; the first resistor is connected to a third terminal of the first voltage receiving module, and the second diode is connected to the motor.

[0017] In one possible implementation, the third voltage receiving module includes a second capacitor, a second resistor, and a third resistor; one end of the second capacitor is connected to the microprocessor, the other end of the second capacitor is connected to the third resistor through the second resistor, and the other end of the second capacitor is grounded;

[0018] The second resistor and the third resistor are both connected to the microprocessor, and the third resistor is connected to the motor.

[0019] In one possible implementation, the grounding module includes two fourth resistors connected in parallel; the two fourth resistors connected in parallel are connected to the microprocessor, and both fourth resistors connected in parallel are grounded.

[0020] In one possible implementation, the microprocessor is also connected to a resistor module in the DC / DC unit, the resistor module comprising a plurality of resistors connected in parallel; the resistor module is used to perform overcurrent detection on the microprocessor.

[0021] In one possible implementation, the control circuit further includes a filtering unit; the filtering unit is connected to the DC / DC unit, the voltage conversion unit, and the motor, respectively.

[0022] The filtering unit is used to filter the first voltage signal and then transmit it to the motor.

[0023] In one possible implementation, the control circuit further includes a voltage processing unit; the voltage processing unit is connected to the DC / DC unit and the voltage processing unit is connected to the microcontroller of the steaming machine;

[0024] The voltage processing unit converts the voltage transmitted by the DC / DC unit and then transmits it to the microcontroller.

[0025] The voltage processing unit is connected to the motor drive unit of the steaming machine, and the motor drive unit of the steaming machine is connected to the motor.

[0026] Secondly, this application provides a vacuum steamer, which is equipped with control circuits as described in the first aspect and / or various possible control circuits described in the first aspect.

[0027] In one possible implementation, the steaming machine also includes a microcontroller.

[0028] This application provides a control circuit for the motor of a vacuum iron and the vacuum iron itself. By constructing a closed-loop control system including an AC / DC unit, a voltage conversion unit, and a DC / DC unit, it achieves precise and dynamic adjustment of the motor voltage, thereby achieving intelligent control of the motor power and speed. Specifically, the circuit uses the AC / DC unit to convert alternating current into direct current and provide a base voltage for subsequent units; the voltage conversion unit collects a first voltage signal characterizing the current operating state of the motor in real time and generates a corresponding modulation signal accordingly; the DC / DC unit, based on the modulation signal, converts its input voltage into a second voltage signal and outputs it to the motor. The core of this closed-loop control mechanism is that the voltage conversion unit continuously monitors the actual voltage of the motor (the first voltage signal) and instructs the DC / DC unit to output a calibrated drive voltage (the second voltage signal), thereby actively and dynamically changing the voltage across the motor. By precisely controlling the voltage applied to the motor, the motor speed can be directly and linearly adjusted, and its output power can be changed, ultimately achieving precise and efficient control of the vacuum iron motor's operating state, enabling it to flexibly adapt to the needs of different ironing conditions. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 A schematic diagram of the control circuit of the motor of a vacuum iron provided in this application embodiment. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of a voltage conversion unit provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of a first voltage receiving module provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the structure of a second voltage receiving module provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of a third voltage receiving module provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure of a grounding module provided in an embodiment of this application;

[0036] Figure 7 A schematic diagram of the control circuit of the motor of a vacuum iron provided in this application embodiment. Figure 2 ;

[0037] Figure 8a A schematic diagram of the power module of a vacuum iron provided in an embodiment of this application;

[0038] Figure 8b This is a schematic diagram of the voltage processing unit of a vacuum iron provided in an embodiment of this application;

[0039] Figure 8c This is a schematic diagram of the zero-crossing detection unit of a vacuum iron provided in an embodiment of this application;

[0040] Figure 8d This application provides a schematic diagram of the structure of an electromagnetic water pump unit for a vacuum ironing machine.

[0041] Figure 8e This application provides a schematic diagram of the structure of a boiler control unit for a vacuum ironing machine.

[0042] Figure 8f This is a schematic diagram of the structure of a motor drive unit for a steam iron provided in an embodiment of this application;

[0043] Figure 8g This is a schematic diagram of the button unit of a vacuum iron provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 101-AC / DC unit; 102-DC / DC unit; 103-Voltage conversion unit; 104-Motor; 105-Filtering unit; 106-Voltage processing unit; 107-Microcontroller; 108-Motor drive unit; 1031-Microprocessor; 1032-First voltage receiving module; 1033-Second voltage receiving module; 1034-Third voltage receiving module; 1035-Grounding module; D1-First diode; D2-Second diode; C1-First capacitor; C2-Second capacitor; R1-First resistor; R2-Second resistor; R3-Third resistor.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0048] As mentioned in the background technology, as a professional steaming device, the core function of a steaming machine relies on the negative pressure adsorption system to stably fix the fabric and quickly remove hot and humid steam.

[0049] Currently, low-speed brushed motors are used as the power source, but this technology has significant performance bottlenecks: Under rated operating conditions, the output speed of low-speed brushed motors is typically only sufficient for basic suction needs, and their limited power density prevents the fan / pump from generating a sufficiently strong vacuum. When processing high-density fabrics or requiring rapid removal of large amounts of steam, existing motor drive systems suffer from insufficient speed and limited power output, leading to decreased adsorption force. This causes fabrics to easily detach or shift, directly affecting the smoothness and continuity of the steaming process. Furthermore, the inherent brush wear, commutation sparks, and efficiency degradation issues of brushed motors further exacerbate vacuum fluctuations under long-term high-load conditions, creating a vicious cycle of "low speed - low power - low vacuum," ultimately failing to meet the "strong adsorption and rapid dehumidification" requirements of efficient steaming operations. This technological limitation not only restricts the operating efficiency of steaming machines but also, due to unstable adsorption, can lead to fabric damage or substandard steaming quality, becoming a key technological bottleneck for improving quality and efficiency in the industry.

[0050] To address the aforementioned technical problems, this application provides a control circuit for the motor of a vacuum ironing machine and the machine itself. A third voltage receiving module collects the motor's operating voltage in real time, which is analyzed and processed by a microprocessor to generate a precise modulation signal. This signal then controls the DC / DC unit to dynamically adjust the voltage output to the motor. This closed-loop control mechanism enables the motor to obtain a precisely optimized drive voltage, thus overcoming the performance limitations of traditional low-speed brushed motors. In practical applications, this circuit allows the motor to operate at a higher voltage when needed, directly increasing output power and speed, ultimately ensuring that the vacuum ironing machine generates sufficient vacuum suction to meet the suction needs of various fabrics, effectively solving the technical problem of insufficient suction force in existing equipment.

[0051] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0052] Figure 1 A schematic diagram of the control circuit of the motor of a vacuum iron provided in this application embodiment. Figure 1 ,like Figure 1 As shown, the control circuit provided in this application embodiment includes: an AC / DC (Alternating Current to Direct Current Unit) 101, a voltage conversion unit 103, a DC / DC (Direct Current to Direct Current Converter) 102, and a motor 104; wherein, the AC / DC unit 101 is connected to the DC / DC unit 102; the voltage conversion unit 103 is connected to the DC / DC unit 102; and both the voltage conversion unit 103 and the DC / DC unit 102 are connected to the motor 104.

[0053] AC / DC unit 101 is used to supply voltage to DC / DC unit 102, and to supply voltage to voltage conversion unit 103 through DC / DC unit 102;

[0054] The voltage conversion unit 103 is used to receive a first voltage signal from the motor 104 and output a modulation signal to the DC / DC unit 102 based on the first voltage signal; wherein, the first voltage signal represents the current voltage of the motor 104;

[0055] DC / DC unit 102 outputs a second voltage signal to motor 104 based on a modulation signal; wherein the second voltage signal is the voltage supplied to motor 104.

[0056] For example, the AC / DC unit 101 is the input terminal of the circuit. Its main function is "AC to DC", that is, to convert standard AC power (such as 220V AC) from the power grid into a stable DC voltage.

[0057] The DC / DC unit 102 is the core power regulation unit of the circuit. Its function is "DC-to-DC," that is, to convert one DC voltage to another DC voltage of a different voltage level. It can precisely adjust its output voltage value according to the control signal. This is similar to an adjustable DC power supply. Optionally, the DC / DC unit 102 regulates the voltage by rapidly switching on and off a power switching transistor (such as a MOSFET).

[0058] The output of AC / DC unit 101 is connected to the input of DC / DC unit 102; that is, the DC power generated by AC / DC unit 101 provides the original power source for DC / DC unit 102. The output of voltage conversion unit 103 is connected to the control terminal of DC / DC unit 102. This connection is used to transmit a modulation signal that instructs DC / DC unit 102 how to change its output voltage. The two ends of motor 104 or related detection points are connected to the input of voltage conversion unit 103. This connection is used to feed back a first voltage signal reflecting the real-time operating state of motor 104 (i.e., the current voltage of motor 104) to voltage conversion unit 103.

[0059] The output of DC / DC unit 102 is connected to motor 104 to provide it with the electrical energy (i.e., the second voltage signal) required for driving.

[0060] AC / DC unit 101 supplies voltage to voltage conversion unit 103 through DC / DC unit 102; that is, voltage conversion unit 103 itself also needs power to operate, and its power may come from an auxiliary power supply output inside DC / DC unit 102, or from the output of AC / DC unit 101 after simple voltage regulation by DC / DC unit 102. This ensures that voltage conversion unit 103 has a stable power supply.

[0061] AC / DC unit 101 serves as the main power supply, providing a preliminary and stable DC operating voltage for the entire system (including the subsequent DC / DC unit 102 and motor 104). It is the energy source for the entire circuit.

[0062] This application provides a control circuit for the motor of a vacuum iron, which, by constructing a closed-loop control system including an AC / DC unit, a voltage conversion unit, and a DC / DC unit, achieves precise and dynamic adjustment of the motor voltage, thereby achieving intelligent control of the motor power and speed. Specifically, the circuit uses the AC / DC unit to convert alternating current into direct current and provide the base voltage for subsequent units; the voltage conversion unit collects a first voltage signal characterizing the current operating state of the motor in real time and generates a corresponding modulation signal accordingly; the DC / DC unit, based on the modulation signal, converts its input voltage into the required second voltage signal and outputs it to the motor. The core of this closed-loop control mechanism is that the voltage conversion unit continuously monitors the actual voltage of the motor (the first voltage signal) and instructs the DC / DC unit to output a calibrated drive voltage (the second voltage signal), thereby actively and dynamically changing the voltage across the motor. By precisely controlling the voltage applied to the motor, the motor speed can be directly and linearly adjusted, and its output power can be changed, ultimately achieving precise and efficient control of the vacuum iron motor's operating state, enabling it to flexibly adapt to the needs of different ironing conditions.

[0063] Figure 2 This is a schematic diagram of the structure of a voltage conversion unit provided in an embodiment of this application, as shown below. Figure 2 As shown, the voltage conversion unit 103 provided in this application embodiment includes: a microprocessor 1031, a first voltage receiving module 1032, a second voltage receiving module 1033, a third voltage receiving module 1034, and a grounding module 1035.

[0064] The first terminal of the first voltage receiving module 1032 is connected to the DC / DC unit 102, the second terminal of the first voltage receiving module 1032 is connected to the microprocessor 1031, and the third terminal of the first voltage receiving module 1032 is connected to the first terminal of the second voltage receiving module 1033. The second terminal of the second voltage receiving module 1033 is connected to the motor 104. The first terminal of the third voltage receiving module 1034 is connected to the microprocessor 1031, and the second terminal of the third voltage receiving module 1034 is connected to the motor 104. The grounding module 1035 is connected to the microprocessor 1031 and is grounded. The microprocessor 1031 is connected to the DC / DC unit 102.

[0065] The first voltage receiving module 1032 is used to transmit the voltage supplied by the DC / DC unit 102 to the microprocessor 1031 when a second voltage signal needs to be provided to the motor 104.

[0066] The second voltage receiving module 1033 is used to transmit voltage to the microprocessor 1031 to supply power when the first voltage receiving module 1032 stops working.

[0067] The microprocessor 1031 is used to receive the first voltage signal transmitted by the third voltage receiving module 1034 and output a modulation signal to the DC / DC unit 102 based on the first voltage signal.

[0068] For example, the microprocessor 1031 is the core control unit, responsible for signal processing and logic operations; the first voltage receiving module 1032 is a DC voltage sampling / transmission module, undertaking the voltage transmission function of the main power supply channel; the second voltage receiving module 1033 is a backup power supply module, maintaining system operation when the main module fails; the third voltage receiving module 1034 is a voltage feedback module for the motor 104, acquiring the operating voltage of the motor 104 in real time; and the grounding module 1035 is a safety grounding module, providing potential reference and ensuring electrical safety. The modules are electrically connected to form a closed-loop structure of "power supply-acquisition-control".

[0069] The first terminal of the first voltage receiving module 1032 is connected to the output terminal of the DC / DC unit 102, forming a DC voltage input channel. The second terminal of the first voltage receiving module 1032 is connected to the microprocessor 1031 to transmit voltage signals. The third terminal of the first voltage receiving module 1032 is connected to the first terminal of the second voltage receiving module 1033, forming a cascaded structure between modules. When the system needs to actively drive the motor 104 (i.e., when a second voltage signal needs to be provided to the motor 104), the first voltage receiving module 1032 conducts electrical energy from the DC / DC unit 102 and converts it into a stable voltage (such as 3.3V or 5V) suitable for the operation of the microprocessor 1031, thus powering the microprocessor 1031. This can be understood as the system's "main power switch".

[0070] The second terminal of the second voltage receiving module 1033 is directly connected to the motor 104, serving as a backup power supply. When the first voltage receiving module 1032 stops operating (e.g., in system standby or hibernation mode, when the main power supply is cut off to save energy), if voltage exists on the motor 104 side due to inertia or other reasons, the second voltage receiving module 1033 can capture this voltage and provide the microprocessor 1031 with the energy needed to maintain basic operation or wake it from hibernation. This enhances the system's reliability and responsiveness.

[0071] The first terminal of the third voltage receiving module 1034 is connected to the analog signal acquisition pin of the microprocessor 1031, and the second terminal of the third voltage receiving module 1034 is connected to the motor 104. This path is used to safely and accurately transmit the first voltage signal representing the operating state of the motor 104 to the microprocessor 1031.

[0072] The microprocessor 1031 is bidirectionally connected to the DC / DC unit 102, receiving both modulation signal feedback and sending control commands. The output pin of the microprocessor 1031 (which can be a PWM pin or a DAC pin; this application does not impose any restrictions) is directly connected to the control terminal of the DC / DC unit 102 for sending modulation signals. The microprocessor 1031 continuously receives a conditioned first voltage signal from the third voltage receiving module 1034. The internal firmware of the microprocessor 1031 compares and calculates this first voltage signal with a preset target voltage value (executing a control algorithm, such as a PID algorithm). Then, based on the calculation result, it generates a corresponding modulation signal (such as changing the duty cycle of the PWM wave) and sends it to the DC / DC unit 102 through its output pin, instructing it to adjust the second voltage signal ultimately output to the motor 104, thus forming a complete, dynamic closed-loop control.

[0073] The grounding module 1035 is connected to the ground pin of the microprocessor 1031 and ultimately to the system ground, providing a stable and clean voltage reference point for the entire unit.

[0074] In one example, the microprocessor 1031 is also connected to a resistor module in the DC / DC unit 102, the resistor module comprising multiple resistors connected in parallel; the resistor module is used to perform overcurrent detection on the microprocessor 1031.

[0075] For example, the resistor module is connected in series in the main power output path of the DC / DC unit 102; that is, all the current flowing out of the DC / DC unit 102 and ultimately supplied to the motor 104 must flow through this resistor module.

[0076] A specific pin of the microprocessor 1031 (which could be an analog-to-digital converter (ADC) pin) is directly connected to the two ends of this resistor module via a wire (or in parallel with the resistor module). More precisely, it is connected to a specific sensing point on the resistor module to measure the voltage drop across the resistor module.

[0077] The resistor module includes multiple resistors connected in parallel; that is, the resistor module serves as a current sampling resistor or a current sensing resistor.

[0078] The microprocessor 1031 (in overcurrent detection) continuously and frequently samples the voltage drop across the resistor module through its internal ADC circuit.

[0079] Since the resistance value R of the resistor module is known and fixed, the microprocessor 1031 can obtain the current value in the current circuit in real time through a simple calculation (I = U / R). It then compares this calculated current value with the preset safe current threshold in the program.

[0080] Once the current value exceeds the threshold, an overcurrent condition is determined, and the microprocessor 1031 can take immediate action. Understandably, the protection measure could be to immediately change or stop the output modulation signal to the DC / DC unit 102, thereby commanding the DC / DC unit 102 to shut down the output or reduce the output voltage, cutting off the current and achieving overcurrent protection.

[0081] The first voltage receiving module ensures a stable power supply to the microprocessor when the main circuit is operating normally, while the second voltage receiving module provides backup power in case of a main power outage, creating power redundancy and greatly enhancing the system's continuous operation and reliability under abnormal conditions. The third voltage receiving module is responsible for accurately acquiring the motor voltage feedback signal, enabling the microprocessor to generate precise modulation signals based on real-time data, and then dynamically adjust the motor terminal voltage through the DC / DC unit. This design ultimately achieves precise and stable control of motor power and speed, allowing the steamer to intelligently adapt to different loads and work requirements, while improving the overall energy efficiency and reliability of the machine.

[0082] Figure 3 This is a schematic diagram of the structure of a first voltage receiving module provided in an embodiment of this application, as shown below. Figure 3 As shown, the embodiment of this application provides a first voltage receiving module 1032 including a first diode D1 and a first capacitor C1 connected in parallel; wherein, the first capacitor C1 is grounded, and the first diode D1 is connected to the first terminal of the DC / DC unit 102, the microprocessor 1031, and the second voltage receiving module 1033 respectively.

[0083] For example, the first diode D1 and the first capacitor C1 are connected in parallel. This means that the anode (positive terminal) of the first diode D1 and one end of the first capacitor C1 are connected to the same point; at the same time, the cathode (negative terminal) of the first diode D1 and the other end of the first capacitor C1 are also connected to the same point.

[0084] The common anode point of the first diode D1 and the first capacitor C1 connected in parallel is connected to the DC / DC unit 102. This is the voltage input terminal of the first voltage receiving module 1032, which receives the DC voltage from the DC / DC unit 102.

[0085] The common cathode point of the first diode D1 and the first capacitor C1 connected in parallel is connected to the power supply pin (such as VCC or VDD) of the microprocessor 1031. This is the voltage output terminal of the first voltage receiving module 1032, which is responsible for supplying power to the microprocessor 1031.

[0086] The other end of the first capacitor C1 (i.e., the common cathode point) is grounded. At the same time, this output point is also connected to the first end of the second voltage receiving module 1033, providing an interface for the backup power supply path.

[0087] The first diode D1 forms a unidirectional conduction path, ensuring that current can only flow from the DC / DC unit 102 to the microprocessor 1031, effectively preventing reverse power flow and maintaining the certainty of the power supply direction during main and backup power switching; at the same time, the first capacitor C1 is grounded to form a high-efficiency filter network, which can absorb voltage ripple and instantaneous fluctuations on the power line, providing a stable and clean operating voltage for the microprocessor 1031.

[0088] The coordinated operation of the first diode and the first capacitor not only ensures the stability and reliability of the power supply to the control core, but also ensures the accuracy of the microprocessor's sampling, calculation, and control. This lays a solid foundation for achieving precise control of the motor power and speed by adjusting the motor terminal voltage, thereby improving the control quality and operational reliability of the entire system.

[0089] Figure 4 This is a schematic diagram of the structure of a second voltage receiving module provided in an embodiment of this application, as shown below. Figure 4 As shown, the embodiment of this application provides a second voltage receiving module 1033 including a first resistor R1 and a second diode D2 connected in series; the first resistor R1 is connected to the third terminal of the first voltage receiving module 1032, and the second diode D2 is connected to the motor.

[0090] For example, the first resistor R1 and the second diode D2 are connected in series to form a single current path.

[0091] One end of the series connection (the end of the first resistor R1 not connected to the diode) is connected to the third terminal of the first voltage receiving module 1032. This connection point is crucial because it means that when the main power supply (from the DC / DC unit 102) is present, this point is at a high potential, thus "blocking" the backup path.

[0092] The other end of the series connection (the end of the second diode D2 not connected to the resistor, i.e., the cathode) is connected to the motor. Optionally, the microprocessor 1031 can be powered by the motor after the first voltage receiving module 1032 stops receiving power; alternatively, the induced voltage generated by the motor windings during inertial rotation or other states (i.e., the first voltage signal) or the voltage externally applied to the motor can be used as a potential energy source for this backup channel. This output point is ultimately connected to the power supply network of the microprocessor 1031.

[0093] In this embodiment, the second voltage receiving module adopts a topology of a first resistor and a second diode connected in series. This design brings key benefits. The second diode constructs a unidirectional backup power supply channel from the motor side to the microprocessor, forming a "diode OR" logic relationship with the main power supply path. This ensures that when the main power supply is interrupted, the system can use the residual voltage on the motor side to maintain the basic operation of the core controller or achieve safe wake-up, significantly enhancing the system's fault response capability and reliability.

[0094] Figure 5 This is a schematic diagram of the structure of a third voltage receiving module provided in an embodiment of this application, as shown below. Figure 5 As shown, the third voltage receiving module 1034 provided in this application embodiment includes a second capacitor C2, a second resistor R2 and a third resistor R3; one end of the second capacitor C2 is connected to the microprocessor 1031, the other end of the second capacitor C2 is connected to the third resistor R3 through the second resistor R2, and the other end of the second capacitor C2 is grounded; the second resistor R2 and the third resistor R3 are both connected to the microprocessor 1031, and the third resistor R3 is connected to the motor 104.

[0095] For example, the second resistor R2 and the third resistor R3 are connected in series to form a voltage divider. The high end of this series combination (the end of the third resistor R3 that is not connected to the second resistor R2) is connected to the operating voltage terminal of the motor 104 to directly acquire the first voltage signal. The low end of this series combination (the end of the second resistor R2 that is not connected to the third resistor R3) is grounded.

[0096] The midpoint between the second resistor R2 and the third resistor R3 (i.e., the node where they are connected) is connected to an analog-to-digital converter (ADC) pin of the microprocessor 1031. The voltage value at this point is the voltage value read by the microprocessor 1031 after voltage division.

[0097] One end of the second capacitor C2 is connected to this crucial sampling point (i.e., the midpoint between the second resistor R2 and the third resistor R3), and the other end is grounded. This constitutes a simple low-pass filter.

[0098] The second resistor R2 and the third resistor R3 serve to proportionally reduce the voltage. The operating voltage of the motor 104 (the first voltage signal) can be as high as tens or even hundreds of volts, while the ADC pin of the microprocessor 1031 can typically only withstand 3.3V or 5V. By selecting appropriate resistor values ​​(for example, the third resistor R3 is much larger than the second resistor R2), the voltage of the motor 104 can be proportionally reduced to a safe range according to the formula V_sample = V_motor * (second resistor R2 / (second resistor R2 + third resistor R3)). For example, if the voltage of the motor 104 is 100V, using a voltage divider ratio of 99:1, then the voltage at the sampling point will be 1V, which the processor can safely read.

[0099] In this embodiment, the third voltage receiving module uses a voltage divider network formed by the second and third resistors, combined with the filtering effect of the second capacitor, to achieve safe, accurate, and stable sampling of the motor voltage signal. This design proportionally attenuates the higher first voltage signal from the motor side to a range that the microprocessor can safely acquire. Simultaneously, the second capacitor effectively filters out high-frequency noise and interference generated during motor operation, ensuring the accuracy and stability of the sampled signal. This protects the microprocessor from overvoltage damage and provides the processor with voltage feedback that accurately reflects the motor's operating state, enabling it to generate precise modulation signals and ultimately achieve accurate and stable control of the motor terminal voltage, and consequently, the motor power and speed.

[0100] Figure 6 This is a schematic diagram of the structure of a grounding module provided in an embodiment of this application, such as... Figure 6 As shown, the grounding module 1035 provided in this application embodiment includes two fourth resistors (R41 and R42) connected in parallel; the two fourth resistors (R41 and R42) are connected to the microprocessor 1031, and both of the two fourth resistors (R41 and R42) are grounded.

[0101] For example, the two fourth resistors (R41 and R42) in the grounding module 1035 are connected together in parallel, meaning that one end of each resistor is connected to the same point, and the other end is also connected to the same point. One end of this parallel resistor combination is connected to the ground pin (GND) of the microprocessor 1031. The other end of this parallel resistor combination is connected to the system's main ground wire, i.e., earth.

[0102] The grounding module 1035 provides a return path for all current from the complex internal circuitry of the microprocessor 1031, including components such as operational amplifiers, ADC converters, and logic circuits. A clean, low-impedance ground plane prevents current interference between different circuit components, avoiding unpredictable voltage fluctuations and ensuring the accuracy of processor logic decisions and analog signal sampling.

[0103] Figure 7 A schematic diagram of the control circuit of the motor of a vacuum iron provided in this application embodiment. Figure 2 ,like Figure 7 As shown, the control circuit provided in this embodiment further includes: an AC / DC unit 101, a voltage conversion unit 103, a DC / DC unit 102, a filtering unit 105, and a voltage processing unit 106. The filtering unit 105 is connected to the DC / DC unit 102, the voltage conversion unit 103, and the motor 104, respectively; the filtering unit 105 is used to filter the first voltage signal and then transmit it to the motor 104. The voltage processing unit 106 is connected to the DC / DC unit 102; the voltage processing unit 106 is connected to the microcontroller 107 of the steaming machine; the voltage processing unit 106 converts the voltage transmitted from the DC / DC unit 102 and then transmits it to the microcontroller 107; wherein, the voltage processing unit 106 is connected to the motor drive unit 108 of the steaming machine, and the motor drive unit 108 of the steaming machine is connected to the motor 104.

[0104] For example, the control circuit provided in the embodiments of this application further includes: an AC / DC unit 101, a voltage conversion unit 103, a DC / DC unit 102, a filtering unit 105, and a voltage processing unit 106.

[0105] For example, the input of the filter unit 105 is directly connected to the output of the DC / DC unit 102. This means that it receives a DC voltage from the DC / DC unit 102 that has been adjusted but may still contain switching noise.

[0106] The output of the filter unit 105 is connected to the power input of the motor 104. The voltage processed by it will be directly used to drive the motor.

[0107] Meanwhile, the filter unit 105 is also connected to the voltage conversion unit 103. More specifically, it provides the voltage state at the output terminal (i.e., both ends of the motor) as a first voltage signal to the voltage conversion unit 103 for sampling.

[0108] DC / DC unit 102 is typically a switching power supply that regulates voltage by rapidly switching power transistors (such as MOSFETs). This operation inevitably generates high-frequency switching ripple and noise on its output voltage.

[0109] The filter unit 105 (typically an LC filter consisting of one or more inductors L and capacitors C) acts as a "smoothing filter." The inductor presents high impedance to high-frequency components, preventing them from passing through; while the capacitor presents low impedance to high-frequency components, bypassing them to ground. Working together, they can greatly attenuate these switching ripples, delivering a smooth and clean DC voltage to the motor 104.

[0110] The more stable the voltage supplied to the motor after processing by the filter unit 105, the smoother the operation of the motor 104 and the smaller the torque ripple. This helps reduce the operating noise and vibration of the motor 104. It also reduces the impact of voltage spikes and glitches on the motor armature, which helps extend the insulation life and overall service life of the motor 104.

[0111] Since the filter unit 105 is connected before the motor, it stabilizes the voltage across the motor 104. The third voltage receiving module 1034 of the voltage conversion unit 103 acquires the first voltage signal from this point.

[0112] If the signal is sampled directly from the output of the DC / DC unit 102, the switching noise in the signal will be detected by the microprocessor 1031, leading to control inaccuracies. However, sampling after filtering ensures that the signal fed back to the microprocessor 1031 is the true and effective terminal voltage of the motor, rather than a chaotic signal superimposed with noise, thus guaranteeing the accuracy and stability of the entire closed-loop control system.

[0113] For example, the input of voltage processing unit 106 is connected to the output of DC / DC unit 102. It draws power from the main power supply of motor 104, typically a higher voltage (e.g., 24V). The output of voltage processing unit 106 is directly connected to the power pin of microcontroller 107 of the steamer. Voltage processing unit 106 (which can be a low-dropout linear regulator or a low-power switching regulator) steps down and regulates the higher voltage (e.g., 24V) from DC / DC unit 102, converting it into a precise and stable 5V voltage required by microcontroller 107. This achieves effective isolation between high and low voltage circuits, protecting the expensive and critical microcontroller 107 from interference and damage to the main power circuit.

[0114] In one possible implementation, the output of the voltage processing unit 106 may also be connected to the motor drive unit 108 of the steaming machine. The motor drive unit 108 may be an independent power drive circuit (such as an H-bridge circuit) directly controlled by the microcontroller 107; this application does not impose specific limitations.

[0115] This application also provides a steaming device comprising: a power module, a voltage processing unit, a zero-crossing detection unit, an electromagnetic water pump unit, a boiler control unit, a button unit, and a motor drive unit. The power module is connected to the motor drive unit, the zero-crossing detection unit, the voltage processing unit, the electromagnetic water pump unit, and the boiler control unit; the motor drive unit, the zero-crossing detection unit, the voltage processing unit, the electromagnetic water pump unit, and the boiler control unit are connected to different interfaces of a microcontroller; the button unit is connected to the microcontroller's interface.

[0116] Figure 8a This is a schematic diagram of the power module of a vacuum iron provided in an embodiment of this application, as shown below. Figure 8a As shown, the power supply module includes an AC / DC unit, a voltage conversion unit, a DC / DC unit, and a filtering unit; the power supply module includes an AC / DC unit, a voltage conversion unit, a DC / DC unit, and a filtering unit to implement various possible implementations of the above embodiments.

[0117] Figure 8b This is a schematic diagram of the voltage processing unit of a vacuum iron provided in an embodiment of this application, as shown below. Figure 8b As shown, the voltage processing unit is used to implement various possible implementations of the above embodiments.

[0118] Figure 8c This is a schematic diagram of the zero-crossing detection unit of a vacuum iron provided in an embodiment of this application, as shown below. Figure 8c As shown, the zero-crossing detection unit is used to monitor the waveform of AC power in real time and accurately detect the instant when the voltage is zero.

[0119] Figure 8d This is a schematic diagram of the structure of an electromagnetic water pump unit for a steam iron provided in an embodiment of this application, as shown below. Figure 8d As shown, the electromagnetic water pump unit receives instructions from the microcontroller to pump water from the storage tank into the boiler. The electromagnetic water pump unit typically operates intermittently, rather than continuously. The microcontroller precisely controls the pump's operating duration and frequency based on the boiler's temperature, steam demand, and safety logic (such as anti-dry-burning measures) to ensure that an appropriate amount of water in the boiler is heated into steam in a timely manner. This guarantees steam supply while preventing excessive water addition that could lead to water spraying or excessive pressure.

[0120] Figure 8e This is a schematic diagram of the boiler control unit of a vacuum iron provided in an embodiment of this application, as shown below. Figure 8e As shown, the boiler control unit is the core component of the steam-generating steamer. The boiler control unit includes a heater and a temperature sensor; the microcontroller monitors the boiler temperature in real time via the temperature sensor. Based on the user-set steam level (configured via a button), the main control chip controls a power switch (such as a relay or thyristor) to switch the heater's power supply on and off, maintaining the boiler temperature within a set range, thus continuously and stably heating the water from the pump unit into steam.

[0121] The boiler control unit integrates anti-dry-burning protection logic. If an abnormally high temperature is detected (indicating a possible water shortage), heating will be immediately cut off to ensure safety.

[0122] Figure 8f This is a schematic diagram of the structure of a motor drive unit for a steam iron provided in an embodiment of this application, as shown below. Figure 8fAs shown, the motor drive unit drives the vacuum motor (suction motor) inside the steamer. The microcontroller sends control signals (such as PWM pulse width modulation signals), and this unit is responsible for providing sufficient current and voltage to drive the motor.

[0123] It can control the motor's start / stop and speed. The speed directly determines the suction strength, and users can select different suction levels via buttons.

[0124] Figure 8g This is a schematic diagram of the button unit of a steam iron provided in an embodiment of this application, as shown below. Figure 8g As shown, the button unit includes a programming module, a speed control button, a power button 1, and a power button 2. The button unit provides a human-machine interface. Users issue commands to the steam iron via the button unit.

[0125] The button unit includes physical buttons or touch buttons, and its functions typically include: power switch, steam volume adjustment, single-use strong steam, light switch, etc. The steaming machine provided in this application includes all possible structures described in the above embodiments.

[0126] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0127] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A control circuit for the motor of a steam iron, characterized in that, The control circuit includes: an AC / DC unit, a voltage conversion unit, and a DC / DC unit; wherein the AC / DC unit is connected to the DC / DC unit; the voltage conversion unit is connected to the DC / DC unit; and both the voltage conversion unit and the DC / DC unit are connected to the motor. The AC / DC unit is used to supply voltage to the DC / DC unit and to supply voltage to the voltage conversion unit through the DC / DC unit; The voltage conversion unit is used to receive a first voltage signal from the motor and output a modulation signal to the DC / DC unit based on the first voltage signal; wherein, the first voltage signal represents the current voltage of the motor; The DC / DC unit outputs a second voltage signal to the motor based on the modulation signal; wherein the second voltage signal is the voltage supplied to the motor.

2. The control circuit according to claim 1, characterized in that, The voltage conversion unit includes a microprocessor, a first voltage receiving module, a second voltage receiving module, a third voltage receiving module, and a grounding module; A first terminal of the first voltage receiving module is connected to the DC / DC unit; a second terminal of the first voltage receiving module is connected to the microprocessor; a third terminal of the first voltage receiving module is connected to the first terminal of the second voltage receiving module; a second terminal of the second voltage receiving module is connected to the motor; a first terminal of the third voltage receiving module is connected to the microprocessor; a second terminal of the third voltage receiving module is connected to the motor; a grounding module is connected to the microprocessor and is grounded; the microprocessor is connected to the DC / DC unit. The first voltage receiving module is used to transmit the voltage delivered by the DC / DC unit to the microprocessor when a second voltage signal needs to be provided to the motor; The second voltage receiving module is used to supply voltage to the microprocessor for power supply when the first voltage receiving module stops working; The microprocessor is used to receive the first voltage signal transmitted by the third voltage receiving module, and output the modulation signal to the DC / DC unit based on the first voltage signal.

3. The control circuit according to claim 2, characterized in that, The first voltage receiving module includes a first diode and a first capacitor connected in parallel; wherein, the first capacitor is grounded, and the first diode is connected to the DC / DC unit, the microprocessor, and the first terminal of the second voltage receiving module.

4. The control circuit according to claim 2, characterized in that, The second voltage receiving module includes a first resistor and a second diode connected in series; the first resistor is connected to the third terminal of the first voltage receiving module, and the second diode is connected to the motor.

5. The control circuit according to claim 2, characterized in that, The third voltage receiving module includes a second capacitor, a second resistor, and a third resistor; one end of the second capacitor is connected to the microprocessor, the other end of the second capacitor is connected to the third resistor through the second resistor, and the other end of the second capacitor is grounded; The second resistor and the third resistor are both connected to the microprocessor, and the third resistor is connected to the motor.

6. The control circuit according to claim 2, characterized in that, The grounding module includes two fourth resistors connected in parallel; the two fourth resistors connected in parallel are connected to the microprocessor, and both fourth resistors connected in parallel are grounded.

7. The control circuit according to claim 2, characterized in that, The microprocessor is also connected to a resistor module in the DC / DC unit, the resistor module comprising multiple resistors connected in parallel; the resistor module is used to perform overcurrent detection on the microprocessor.

8. The control circuit according to any one of claims 1-7, characterized in that, The control circuit further includes a filtering unit; the filtering unit is connected to the DC / DC unit, the voltage conversion unit, and the motor respectively. The filtering unit is used to filter the first voltage signal and then transmit it to the motor.

9. The control circuit according to any one of claims 1-7, characterized in that, The control circuit also includes a voltage processing unit; the voltage processing unit is connected to the DC / DC unit and to the microcontroller of the steaming machine; The voltage processing unit converts the voltage transmitted by the DC / DC unit and then transmits it to the microcontroller. The voltage processing unit is connected to the motor drive unit of the steaming machine, and the motor drive unit of the steaming machine is connected to the motor.

10. A suction iron, characterized in that, The steaming machine is equipped with a control circuit for the motor of the steaming machine as described in any one of claims 1-9.

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