Laundry detection module, apparatus, and laundry treatment device
By using spaced metal strips in a garment processing device to detect the dryness of clothing and generate a voltage waveform, the problem of short lifespan and low accuracy of humidity sensors in high-temperature and humid environments is solved, achieving high-accuracy garment dryness detection and extending equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANJING ROBOROCK INNOVATION TECH CO LTD
- Filing Date
- 2024-11-29
- Publication Date
- 2026-05-29
AI Technical Summary
Existing humidity sensors suffer from short lifespan and low detection accuracy in the high-temperature and humid environments of garment processing equipment.
The system employs a first metal plate and a second metal plate spaced apart. The control module is used to detect the dryness of the clothing. It generates a voltage waveform by measuring the change in resistance between the metal plates when the clothing is connected. The control module is located in a non-high-temperature and non-humid environment to avoid damage.
It improves the accuracy of clothing dryness detection and extends the lifespan of the equipment, avoiding damage to complex circuits in high-temperature and humid environments.
Smart Images
Figure CN122105779A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of clothing processing technology, and in particular to a clothing detection module, device, and clothing processing equipment. Background Technology
[0002] During the drying process of some clothing processing equipment (such as dryers), it is necessary to test the dryness of the clothes (i.e., the degree of drying) to determine whether the clothes have reached the dryness required by the user.
[0003] Currently, moisture sensors are typically placed inside the garment processing drum of a garment processing machine to measure the dryness of the clothes. However, moisture sensors usually involve complex circuitry, and the garment processing drum of a garment processing machine is typically in a high-temperature and humid environment. This can easily damage the internal circuitry of the moisture sensor (such as causing a short circuit or a loss of sensitivity of the sensing element), resulting in a short lifespan for the moisture sensor or low accuracy in detecting the dryness of the clothes. Summary of the Invention
[0004] This application provides a clothing detection module, device, and clothing processing equipment to solve the problems of low service life or low accuracy of clothing dryness detection by existing dryness and humidity sensors in high temperature and humid environments.
[0005] In a first aspect, this application provides a clothing dryness detection module, including a control module, a first metal plate, and a second metal plate. The first metal plate and the second metal plate are spaced apart. The first metal plate is electrically connected to the control module. The control module is used to control the voltage change corresponding to the resistance value between the first metal plate and the second metal plate to be a periodic voltage waveform that characterizes the dryness of the clothing when the clothing is connected between the first metal plate and the second metal plate. The period of the voltage waveform is related to the dryness of the clothing.
[0006] In some implementations, the control module includes a voltage waveform processing module and a first voltage divider resistor;
[0007] The first voltage divider resistor, the first metal plate and the second metal plate set at intervals are connected in series between the first external power supply and ground. The signal input terminal of the voltage waveform processing module is electrically connected to the voltage acquisition point between the first voltage divider resistor and the first metal plate, and the voltage change corresponding to the resistance value at both ends of the first metal plate and the second metal plate is the voltage change at the voltage acquisition point.
[0008] The voltage waveform processing module is used to control the voltage change at the voltage acquisition point to be a periodic voltage waveform that characterizes the dryness of the clothing when the first metal sheet and the second metal sheet are connected by clothing, and to acquire the periodic voltage waveform that characterizes the dryness of the clothing at the voltage acquisition point based on the signal input terminal.
[0009] In some implementations, the voltage waveform processing module includes a first operational amplifier and a reference resistor, with the signal input terminal being the positive input terminal of the first operational amplifier;
[0010] The positive input terminal of the first operational amplifier is electrically connected to the voltage acquisition point between the first voltage divider resistor and the first metal plate. A charging and discharging capacitor is connected in series between the inverting input terminal of the first operational amplifier and ground. A reference resistor is connected in series between the inverting input terminal and the output terminal of the first operational amplifier.
[0011] In some implementations, a voltage follower module is connected in series between the voltage acquisition point and the signal input terminal of the voltage waveform processing module.
[0012] In some implementations, the voltage follower module includes a second operational amplifier, the non-inverting input of which is electrically connected to the voltage acquisition point, the negative-inverting input of which is electrically connected to the output of which is also electrically connected to the signal input of the voltage waveform processing module.
[0013] The power supply terminal of the second operational amplifier is used to electrically connect to the first external power supply. The second operational amplifier also includes a ground terminal.
[0014] In some implementations, a first voltage regulator module for stabilizing the voltage at the voltage acquisition point is also connected in series between the first external power supply and ground.
[0015] In some implementations, the first voltage regulator module includes a first diode, a second diode, and a second voltage divider resistor. The output terminal, the input terminal, the voltage acquisition point, the output terminal, and the input terminal of the second diode are connected in series between the first external power supply and ground.
[0016] The second voltage divider resistor is connected in parallel with the first and second metal plates that are spaced apart, as well as the second voltage divider resistor.
[0017] In some implementations, the output of the voltage waveform processing module is also electrically connected to a signal amplification module.
[0018] In some implementations, the signal amplification module includes a transistor, a pull-up resistor, and a pull-down resistor. The base of the transistor is electrically connected to the output terminal of the voltage waveform processing module, and the collector of the transistor is electrically connected to the pull-up resistor, which is used to electrically connect to a second external power supply. The emitter of the transistor is grounded, and the emitter, pull-down resistor, and base of the transistor are sequentially electrically connected.
[0019] In some implementations, the output of the signal amplification module is also connected to a filtering module.
[0020] In some implementations, the filtering module includes a filter capacitor and a filter resistor, which are connected in series between the pull-up resistor and ground.
[0021] In some implementations, at least one first current-limiting resistor is connected in series between the second metal sheet and ground.
[0022] In some implementations, the second metal sheet is also electrically connected to the ground terminal via an electrostatic discharge branch.
[0023] Secondly, this application also provides a clothing dryness detection device, including the clothing dryness detection module provided in the first aspect of this application. The control module further includes a controller, which is electrically connected to the output terminal of the voltage waveform processing module.
[0024] In some implementations, the controller is used to receive a voltage waveform characterizing the dryness of the clothing from the voltage waveform processing module when the clothing is in communication between the first metal sheet and the second metal sheet.
[0025] Extract the period or frequency of the voltage waveform;
[0026] The dryness of clothing is determined based on the period or frequency of the voltage waveform and a first mapping relationship, wherein the first mapping relationship is used to characterize the correspondence between different dryness levels of clothing and the period or frequency of the voltage waveform.
[0027] Secondly, this application also provides a garment processing device, including a garment processing space that can contact garments and a garment dryness detection device provided in the second aspect of this application. One end of a first metal sheet and a second metal sheet are spaced apart and disposed within the garment processing space of the garment processing device that can contact garments, and the other end of the first metal sheet and the second metal sheet are spaced apart and disposed outside the garment processing space. A control module is disposed outside the garment processing space.
[0028] In some embodiments, the garment handling equipment also includes a main control circuit board or a display circuit board disposed outside the garment handling space, with the control module integrated into the main control circuit board or the display circuit board.
[0029] In some implementations, the clothing handling equipment is a dryer or a washing machine.
[0030] This application provides a clothing detection module, device, and clothing processing equipment. One end of a first metal sheet and a second metal sheet are spaced apart and positioned within the clothing processing space of the clothing processing equipment, allowing them to contact the clothing. When clothing in the clothing processing space of the clothing processing equipment comes into contact with the first and second metal sheets, the resistance between the first and second metal sheets changes. At this time, the control module controls the voltage change corresponding to the resistance value between the first and second metal sheets to form a periodic voltage waveform characterizing the dryness of the clothing. Since the period of the voltage waveform is related to the dryness of the clothing, the dryness of the clothing can be detected accordingly. In the above-described clothing detection module, since the first and second metal sheets are used to contact the clothing and are located in a high-temperature and humid environment, while the control board does not need to contact the clothing and can be located outside of such an environment, the first and second metal sheets do not have complex circuit structures and are not easily damaged or have their sensitivity reduced by being in a high-temperature and humid environment. Therefore, this clothing detection module has a long service life and high accuracy in detecting the dryness of the clothing. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is one of the circuit diagrams of the clothing detection module provided in the embodiments of this application;
[0033] Figure 2 The second circuit diagram of the clothing detection module provided in the embodiments of this application;
[0034] Figure 3 The third circuit diagram of the clothing detection module provided in the embodiments of this application;
[0035] Figure 4 The voltage waveform diagram output by the voltage processing module provided in the embodiments of this application;
[0036] Figure 5 The fourth circuit diagram of the clothing detection module provided in the embodiments of this application;
[0037] Figure 6 This is a schematic diagram of the structure of the clothing detection device provided in the embodiments of this application. Detailed Implementation
[0038] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.
[0039] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.
[0040] In the context of this disclosure, when a layer / element is referred to as being "above" another layer / element, the layer / element may be directly above the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "above" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.
[0041] The technical solutions of this application and how they solve the aforementioned technical problems will be 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 repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0042] Please see Figure 1 This application provides a clothing dryness detection module, including a control module 101, a first metal plate 102, and a second metal plate 103, which are spaced apart. The first metal plate 102 and the second metal plate 103 can be, but are not limited to, copper or stainless steel, etc., and are not limited thereto. The first metal plate 102 is electrically connected to the control module 101. The supply voltage of the first external power supply SD1 can be, but is not limited to, 12V.
[0043] It should be noted that when the first metal sheet 102 and the second metal sheet 103 are connected by clothing containing moisture, the resistance between the first metal sheet 102 and the second metal sheet 103 will change.
[0044] When the first metal sheet 102 and the second metal sheet 103 are connected by clothing, the control module 101 controls the voltage change corresponding to the resistance value between the first metal sheet 102 and the second metal sheet 103 to be a periodic voltage waveform that characterizes the dryness of the clothing, and the period of the voltage waveform is related to the dryness of the clothing.
[0045] In this way, the control module 101 can extract the period or frequency of the voltage waveform; and accurately determine the dryness of the clothing based on the period or frequency of the voltage waveform and the first mapping relationship. The first mapping relationship characterizes the correspondence between different dryness levels of the clothing and the period or frequency of the voltage waveform.
[0046] This application provides a clothing detection module in which one end of a first metal sheet 102 and a second metal sheet 103 are spaced apart and positioned within a clothing processing space 105 of a clothing processing device 106, allowing contact with clothing. When clothing in the clothing processing space 105 of the clothing processing device 106 comes into contact with the first metal sheet 102 and the second metal sheet 103, the resistance between them changes. At this time, the control module 101 controls the voltage change corresponding to the resistance between the first metal sheet 102 and the second metal sheet 103 to be a periodic voltage waveform characterizing the dryness of the clothing, since the period of the voltage waveform is related to the dryness of the clothing. In this way, the dryness of the clothing can be detected accordingly. In the above-mentioned clothing detection module, since the first metal plate 102 and the second metal plate 103 are used to attach clothing, they are located in a high-temperature and humid environment. However, the control board does not need to attach clothing, so it can be placed outside the high-temperature and humid environment. Since the first metal plate 102 and the second metal plate 103 do not have a complex circuit structure, they are not easily damaged or have their sensitivity reduced due to being in a high-temperature and humid environment. Therefore, the clothing detection module has a long service life and high accuracy in detecting the dryness of clothing.
[0047] Specifically, in some implementations, such as Figure 2 As shown, the control module 101 includes a voltage waveform processing module 104 and a first voltage divider resistor R4. The first voltage divider resistor R4, a first metal plate 102 and a second metal plate 103 spaced apart, are connected in series between a first external power supply SD1 and ground. The supply voltage of the first external power supply SD1 can be, but is not limited to, 12V. The signal input terminal of the voltage waveform processing module 104 is electrically connected to a voltage acquisition point P1 between the first voltage divider resistor R4 and the first metal plate 102, and the voltage change corresponding to the resistance value across the first metal plate 102 and the second metal plate 103 is the voltage change at the voltage acquisition point P1.
[0048] The voltage waveform processing module 104 is used to control the voltage change of the voltage acquisition point P1 to be a periodic voltage waveform that characterizes the dryness of the clothing when the first metal sheet 102 and the second metal sheet 103 are connected by clothing, and to acquire the periodic voltage waveform of the voltage acquisition point P1 that characterizes the dryness of the clothing based on the signal input terminal.
[0049] For example, such as Figure 3 As shown, the voltage waveform processing module 104 includes a first operational amplifier U1 and a reference resistor R11, and the signal input terminal is the positive input terminal of the first operational amplifier U1.
[0050] The positive input terminal of the first operational amplifier U1 is electrically connected to the voltage acquisition point P1 between the first voltage divider resistor R4 and the first metal plate 102. A charging and discharging capacitor C4 is connected in series between the inverting input terminal of the first operational amplifier U1 and ground. A reference resistor R11 is connected in series between the inverting input terminal of the first operational amplifier U1 and the output terminal of the first operational amplifier U1.
[0051] When the clothes in the clothing processing space 105 of the clothing processing device 106 are attached to the first metal plate 102 and the second metal plate 103, the resistance between the first metal plate 102 and the second metal plate 103 changes, and the voltage at the voltage acquisition point P1 also changes. The voltage at the positive input terminal of the first operational amplifier U1 also changes accordingly. Since the output terminal of the first operational amplifier U1 is connected between the inverting input terminal of the first operational amplifier U1 and the charging and discharging capacitor C4, the output terminal of the first operational amplifier U1 charges the charging and discharging capacitor C4, causing the voltage at the inverting input terminal of the first operational amplifier U1 to rise over time. When the voltage at the inverting input terminal of the first operational amplifier U1 rises to a level greater than the voltage at the positive input terminal of the first operational amplifier U1, the voltage signal level at the output terminal of the first operational amplifier U1 is reversed. At this time, the voltage at the inverting input terminal of the first operational amplifier U1 is less than the voltage at the non-inverting input terminal of the first operational amplifier U1, and the charging capacitor C4 at the output terminal of the first operational amplifier U1 starts charging again, and so on.
[0052] Understandably, the period from the start of charging the capacitor C4 at the output of the first operational amplifier U1 to the start of the next restart of charging the capacitor C4 at the output of the first operational amplifier U1 constitutes one cycle of the voltage waveform. The voltage waveform output from the output of the first operational amplifier U1 can be described as follows: Figure 4 As shown.
[0053] Understandably, the drier the clothes, the greater their resistance. This results in a higher voltage supplied by the first external power supply SD1 to the voltage acquisition point P1, leading to a higher output voltage for the first operational amplifier U1. Consequently, the charging / discharging capacitor C4 charges faster, resulting in a shorter voltage waveform period. Therefore, it can be concluded that the voltage waveform period is negatively correlated with the dryness of the clothes, while the voltage waveform frequency is positively correlated with the dryness of the clothes.
[0054] In some implementations, the voltage acquisition point P1 is also electrically connected to the output terminal of the first operational amplifier U1 through the fourth current-limiting resistor R2.
[0055] Optionally, such as Figure 5 As shown, a voltage follower module 104 is connected in series between the voltage acquisition point P1 and the signal input terminal of the voltage waveform processing module 104. The voltage follower module 104 can keep the voltage at the voltage acquisition point P1 consistent with the voltage at the signal input terminal of the voltage waveform processing module 104 (such as the positive input terminal of the first operational amplifier U1), thus avoiding voltage distortion or interference at the signal input terminal of the voltage waveform processing module 104.
[0056] Specifically, the voltage follower module 104 may include a second operational amplifier U2. The non-inverting input terminal of the second operational amplifier U2 is electrically connected to the voltage acquisition point P1, the negative-inverting input terminal of the second operational amplifier U2 is electrically connected to the output terminal of the second operational amplifier U2, and the output terminal of the second operational amplifier U2 is also electrically connected to the signal input terminal of the voltage waveform processing module 104. The power supply terminal of the second operational amplifier U2 is used to electrically connect to the first external power supply SD1, and the second operational amplifier U2 also includes a ground terminal.
[0057] In addition, a second current-limiting resistor R5 is connected in series between the output terminal of the second operational amplifier U2 and the input terminal of the first operational amplifier U1.
[0058] In addition, as before Figure 5 As shown, a first voltage regulator module 108 for stabilizing the voltage at voltage acquisition point P1 can also be connected in series between the first external power supply SD1 and ground, which can further prevent voltage distortion or interference at the signal input terminal of the voltage waveform processing module 104.
[0059] For example, the first voltage regulator module 108 may include a first diode D1, a second diode D2 and a second voltage divider resistor R8. The output terminal, input terminal, voltage acquisition point P1, output terminal and input terminal of the second diode D2 are connected in series between the first external power supply SD1 and ground. The second voltage divider resistor R8 is connected in parallel with the first metal plate 102 and the second metal plate 103 that are spaced apart.
[0060] In addition, as before Figure 5 As shown, a second voltage regulator module 109 is connected between the first external power supply SD1 and the first operational amplifier U1. The second voltage regulator module 109 is used to stabilize the power supply voltage of the first operational amplifier U1. The second voltage regulator module 109 may include a first voltage regulator capacitor C1 and a second voltage regulator capacitor C2 connected in parallel between the connection point between the first external power supply SD1 and the first operational amplifier U1 and ground.
[0061] Still Figure 5 As shown, the output terminal of the voltage waveform processing module 104 (such as the output terminal of the first operational amplifier U1) is also electrically connected to a signal amplification module 110. The signal amplification module 110 is used to amplify the voltage waveform signal output from the output terminal of the voltage waveform processing module 104 for recognition by the controller on the control module 101.
[0062] For example, the signal amplification module 110 includes a transistor Q, a pull-up resistor R1, and a pull-down resistor R9. The base of transistor Q is electrically connected to the output terminal of the voltage waveform processing module 104, and the collector of transistor Q is electrically connected to the pull-up resistor R1. The pull-up resistor R1 is used to electrically connect to a second external power supply SD2 (e.g., 5V). The emitter of transistor Q is grounded, and the emitter of transistor Q, the pull-down resistor R9, and the base of transistor Q are sequentially electrically connected. In some embodiments, a third current-limiting resistor R6 is connected between the output terminal of the voltage waveform processing module 104 and the base of the transistor.
[0063] The output of the signal amplification module 110 is also connected to a filtering module 111. The filtering module 111 is used to filter the voltage waveform signal output from the output of the voltage waveform processing module 104 to remove noise. For example, the filtering module 111 may include a filtering capacitor C3 and a filtering resistor R3, which are connected in series between the pull-up resistor R1 and ground.
[0064] Optionally, at least one first current-limiting resistor is connected in series between the second metal plate 103 and ground. In this way, the at least one first current-limiting resistor can limit the current flowing through the first metal plate 102 and the second metal plate 103, thereby preventing the first metal plate 102 and the second metal plate 103 from overheating and being damaged. In the embodiments of the application, the at least one first current-limiting resistor includes R10, R11, and R12 connected in series.
[0065] In addition, the second metal sheet 103 is electrically connected to the ground terminal through an electrostatic discharge branch, so that static electricity on the clothing can be released to the ground through the electrostatic discharge branch. In some embodiments, a resistor R7 is provided in the electrostatic discharge branch, wherein R7 is small, such as R7 being between 0 ohms and 1 ohm, in order to release static electricity.
[0066] like Figure 5 As shown, this application also provides a clothing dryness detection device, including the clothing dryness detection module provided in the first aspect of this application. The control module 101 further includes a controller (such as a microcontroller), which is electrically connected to the output terminal of the voltage waveform processing module 104. The controller is used to receive a voltage waveform representing the dryness of the clothing from the voltage waveform processing module 104 when clothing connects the first metal plate 102 and the second metal plate 103; extract the period or frequency of the voltage waveform; and determine the dryness of the clothing based on the period or frequency of the voltage waveform and a first mapping relationship. The first mapping relationship is used to characterize the correspondence between different dryness levels of the clothing and the period or frequency of the voltage waveform.
[0067] like Figure 6 As shown, this application also provides a clothing processing device 106, including a clothing processing space 105 capable of contacting clothing and a clothing dryness detection device provided in the above embodiments of this application. One end of a first metal sheet 102 and a second metal sheet 103 are spaced apart and disposed within the clothing processing space 105 of the clothing processing device 106, while the other ends of the first metal sheet 102 and the second metal sheet 103 are spaced apart and disposed outside the clothing processing space 105. Exemplarily, the clothing processing device 106 includes a clothing inlet 113 and a clothing dispensing side 114 sleeved outside the clothing dispensing port 113 and used to support the clothing dispensing port 113. The other ends of the first metal sheet 102 and the second metal sheet 103 are spaced apart and disposed on the clothing dispensing side 114. A control module 101 is disposed outside the clothing processing space 105. For convenient detection, the first metal sheet 102 and the second metal sheet 103 can be installed in parallel.
[0068] In some embodiments, the garment processing device 106 further includes a main control circuit board or a display circuit board disposed outside the garment processing space 105, and the control module 101 is integrated into the main control circuit board or the display circuit board.
[0069] For example, the clothing handling device 106 can be, but is not limited to, a dryer or a washing machine. When the clothing handling device 106 is a dryer, the clothing handling space 105 can be the dryer's drum or main air duct; when the clothing handling device 106 is a washing machine, the clothing handling space 105 can be the washing drum of the washing machine.
[0070] The above description does not provide detailed technical specifications regarding the structure of each layer. However, those skilled in the art should understand that layers and regions of desired shapes can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be advantageously combined.
[0071] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A clothing dryness detection module, characterized in that, The clothing dryness detection module includes a control module, a first metal plate, and a second metal plate, wherein the first metal plate and the second metal plate are arranged at an interval. The first metal sheet is electrically connected to the control module. The control module is used to control the voltage change corresponding to the resistance value between the first metal sheet and the second metal sheet to be a periodic voltage waveform that characterizes the dryness of the clothing when the first metal sheet and the second metal sheet are connected by clothing. The period of the voltage waveform is related to the dryness of the clothing.
2. The module according to claim 1, characterized in that, The control module includes a voltage waveform processing module and a first voltage divider resistor; The first voltage divider resistor, the first metal plate and the second metal plate spaced apart are connected in series between the first external power supply and ground. The signal input terminal of the voltage waveform processing module is electrically connected to the voltage acquisition point between the first voltage divider resistor and the first metal plate. The voltage change corresponding to the resistance value at both ends of the first metal plate and the second metal plate is the voltage change at the voltage acquisition point. The voltage waveform processing module is used to control the voltage change of the voltage acquisition point to be a periodic voltage waveform that characterizes the dryness of the clothing when the first metal sheet and the second metal sheet are connected by clothing, and to acquire the periodic voltage waveform of the voltage acquisition point that characterizes the dryness of the clothing based on the signal input terminal.
3. The module according to claim 2, characterized in that, The voltage waveform processing module includes a first operational amplifier and a reference resistor, and the signal input terminal is the positive input terminal of the first operational amplifier; The positive input terminal of the first operational amplifier is electrically connected to the voltage acquisition point between the first voltage divider resistor and the first metal plate. A charging and discharging capacitor is connected in series between the inverting input terminal of the first operational amplifier and ground. The reference resistor is connected in series between the inverting input terminal of the first operational amplifier and the output terminal of the first operational amplifier.
4. The module according to claim 2, characterized in that, A voltage follower module is connected in series between the voltage acquisition point and the signal input terminal of the voltage waveform processing module.
5. The module according to claim 4, characterized in that, The voltage follower module includes a second operational amplifier. The non-inverting input terminal of the second operational amplifier is electrically connected to the voltage acquisition point, the negative-inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also electrically connected to the signal input terminal of the voltage waveform processing module. The power supply terminal of the second operational amplifier is used to electrically connect to the first external power supply, and the second operational amplifier also includes a ground terminal.
6. A clothing dryness detection device, characterized in that, The control module includes the clothing dryness detection module according to any one of claims 1-5, and the control module further includes a controller, which is electrically connected to the output terminal of the voltage waveform processing module.
7. The apparatus according to claim 6, characterized in that, The controller is used to receive a voltage waveform representing the dryness of the clothing from the voltage waveform processing module when the first metal sheet and the second metal sheet are connected by clothing. Extract the period or frequency of the voltage waveform; The dryness of the garment is determined based on the period or frequency of the voltage waveform and a first mapping relationship, wherein the first mapping relationship is used to characterize the correspondence between different dryness levels of the garment and the period or frequency of the voltage waveform.
8. A garment processing device, characterized in that, The device includes a clothing processing space that can contact clothing and the clothing dryness detection device as described in claim 6. One end of the first metal sheet and the second metal sheet are spaced apart and disposed within the clothing processing space of the clothing processing device that can contact clothing. The other end of the first metal sheet and the second metal sheet are spaced apart and disposed outside the clothing processing space. The control module is disposed outside the clothing processing space.
9. The garment processing equipment according to claim 8, characterized in that, The garment processing equipment also includes a main control circuit board or a display circuit board disposed outside the garment processing space, and the control module is integrated into the main control circuit board or the display circuit board.
10. The garment processing equipment according to claim 9, characterized in that, The clothing processing equipment is a dryer or a washing machine.