Patent Description:
In recent years, due to a change in consumer perception that a dryer removes fine dusts from clothes, as the sales volume of the dryer increases, the amount of dryer used is also increasing.

As such, as the dryer is used more frequently, consumer complaints about the limitation in which clothes are not sufficiently dried and the limitation of excessive drying of the clothes have been received.

The reason is because of the technical limitations of a contact electrode sensor that sense the dry state through the contact with the cloth, and it is impossible to sense the dry state of the cloth that the consumer feels.

Therefore, to know an exact drying completion time for this reason, the development of a non-contact humidity sensor for the dryer capable of increasing in accuracy and precision of measuring humidity of laundry in the dryer is required. <CIT> discloses that a Capacitance to Digital Converter IC provides active shields driven at the same frequency and voltage as a capacitance electrode. Shield <NUM> is driven in phase and at the same voltage as a capacitance electrode signal and used to surround the capacitance electrode as well as its signal traces on a pcb, limiting parasitic noise pick-up from the surrounding area. Shield <NUM> is <NUM>° out-of-phase with the capacitance signal which maintains a constant voltage with the capacitance electrode and is used for a return signal path. <CIT> discloses a transducer comprising at least one planar capacitor with a thin coverlayer of material selected to maximize electric field coupling between cooperating capacitor electrodes within a region external to a principal surface of the coverlayer. The document "<NPL>, discloses feasibility of a shielding electrode under an interdigitated electrode structure in a simulation software. A thickness of a sensing layer with different electrode gaps and a dielectric thickness between the shielding electrode and the interdigitated electrodes were optimized regarding the sensitivity and response speed.

An object of the present disclosure is to solve the foregoing limitations and other limitations.

Embodiments provide an apparatus and method for measuring humidity for a dryer, in which noise on a measurement signal is removed by using a capacitance measuring sensor and an active shield, and a signal-to-noise ratio is minimized to accurately and precisely measure humidity of an object to be dried.

Embodiments also provide an apparatus and method for measuring humidity for a dryer, in which a humidity sensing range is adjusted to an optimal area by using an active shield to accurately and precisely measure humidity of an object to be dried, which is disposed at a specific area.

In one embodiment, an apparatus for measuring humidity for a dryer includes: a capacitance measuring sensor configured to measure an amount of capacitance change that is changed due to humidity of an object to be dried, which is put into the dryer; a shield configured to shield noise generated in the dryer; and a processor electrically connected to the capacitance measuring sensor and the shield, wherein the processor is configured to: apply a second signal having the same waveform and the same voltage to the capacitance measuring sensor and the shield; and acquire the amount of capacitance change, based on the first signal output from the capacitance measuring sensor so as to measure an amount of humidity change of the object to be dried.

In another embodiment, a method for measuring humidity in an apparatus for measuring humidity for a dryer, which comprises a processor electrically connected to a capacitance measuring sensor and a shield, includes: applying a second signal having the same waveform and the same voltage to the capacitance measuring sensor and the shield; acquiring an amount of capacitance change, based on a first signal output from the capacitance measuring sensor; and measuring an amount of humidity change of an object to be dried, based on the acquired amount of capacitance change.

Hereinafter, embodiments disclosed in this specification is described with reference to the accompanying drawings, and the same or corresponding components are given with the same drawing number regardless of reference number, and their duplicated description will be omitted. Furthermore, terms, such as a "module" and a "unit", are used for convenience of description, and they do not have different meanings or functions in themselves. Moreover, detailed descriptions related to well-known functions or configurations will be ruled out in order not to unnecessarily obscure subject matters of this specification. However, this does not limit this specification within specific embodiments and it should be understood that the present disclosure covers all the modifications, equivalents, and replacements within the idea and technical scope of this specification.

It will be understood that although the ordinal numbers such as first and second are used herein to describe various elements, these elements should not be limited by these numbers. The terms are only used to distinguish one component from other components.

It will also be understood that when an element is referred to as being '"connected to" or "engaged with" another element, it can be directly connected to the other element, or intervening elements may also be present. It will also be understood that when an element is referred to as being 'directly connected to' another element, there is no intervening elements.

<FIG> and <FIG> are perspective views illustrating a dryer and a humidity sensor for the dryer according to an embodiment, <FIG> is a side view illustrating the dryer according to an embodiment, and <FIG> is a block diagram for explaining a configuration of the dryer according to an embodiment.

In the following drawings, although a dryer <NUM> is described as an example of a laundry treatment apparatus, embodiments may not be applied only to the dryer <NUM>, but be applied to various laundry treatment apparatuses such as a washing machine having a drying function.

In addition, in the embodiments, it is not limited to a circulating dryer in which air inside the dryer is circulated, and it is to be noted that it is also applicable to an exhaust dryer.

Referring to <FIG>, a dryer <NUM> may include a drying drum <NUM> into which an object to be dried (hereinafter, referred to as a drying object) is put, a humidity sensor <NUM> mounted on an inner circumferential surface of the drying drum <NUM>, a front cabinet <NUM> supporting a front surface of the drying drum <NUM>, a blocking member <NUM> mounted to a bottom of the front cabinet <NUM>, a rear cabinet <NUM> supporting a rear surface of the drying drum <NUM>, and a lint filter cleaner <NUM> provided below the drying drum <NUM>.

In detail, the humidity sensor <NUM> may be disposed in the drying drum <NUM> to sense humidity of the drying drum <NUM>.

In an embodiment, the humidity sensor <NUM> may be disposed at a position, which is in contact with laundry, of the blocking members <NUM> mounted on the bottom of the drying drum <NUM> to sense humidity.

In addition, the dryer <NUM> may further include a suction duct <NUM> suctioning air to be supplied to the drying drum <NUM>, a rear duct <NUM> connecting the suction duct <NUM> to an air inlet hole defined in a rear surface of the suction duct <NUM>, a guide duct <NUM> connected to a bottom surface of the front cabinet <NUM> to guide the air discharged from the drying drum <NUM>, an air blower <NUM> connected to an outlet end of the guide duct <NUM>, and an exhaust duct <NUM> connected to an outlet end of the air blower <NUM>. The lint filter cleaner <NUM> is mounted at any point of the exhaust duct <NUM> so that lint contained in the air flowing along the exhaust duct <NUM> is filtered while passing through a lint filter assembly provided in the lint filter cleaner <NUM>.

A middle cabinet (not shown) is provided between the front cabinet <NUM> and the rear cabinet <NUM> to cover and protect the drying drum <NUM> and various components disposed below the drying drum <NUM>. The middle cabinet may define both side surfaces and a top surface of the dryer <NUM>. A base plate <NUM> defining the bottom of the dryer <NUM> may be provided on a bottom surface of the middle cabinet, and the components may be mounted on the base plate <NUM>.

In addition, a control panel (not shown) may be mounted at an upper side of a front surface of the front cabinet <NUM>. The control panel may include an input unit <NUM> configured to select an operation mode (e.g., a drying mode) of the dryer <NUM>, and a display unit <NUM> configured to display a variety of information including an operation state.

In addition, a temperature sensor <NUM> may be mounted at an outlet side of the drying drum <NUM>. The temperature sensor <NUM> is mounted at the outlet side of the drying drum <NUM> to detect an outlet temperature value of the drying drum <NUM> (hereinafter, referred to as a "drum outlet temperature value").

For example, the temperature sensor <NUM> may be mounted on an inner circumferential surface of a side of the front end of the drying drum <NUM> and may be mounted at one side of an inner circumferential surface of the guide duct <NUM> connected to the outlet side of the drying drum <NUM>.

In addition, the blocking member <NUM> is provided to prevent foreign substances contained in an object to be dried, for example, bulky and hard foreign substances a coin, a ballpoint pen, and the like from being suctioned into the guide duct <NUM> during the drying process. The foreign substances, such as lint, are filtered in the lint filter assembly mounted on the lint filter cleaner <NUM> even through being introduced into the guide duct <NUM>. Other foreign substances, i.e., bulky and hard foreign substances, are blocked by the blocking member <NUM> to remain in the drying drum <NUM>. If substances other than lint are suctioned into the guide duct <NUM>, the air blower <NUM> may be damaged or may generate a rattling sound in the exhaust duct <NUM>. Therefore, it is necessary to prevent the foreign substances from leaving the drying drum <NUM> by the blocking member <NUM>. In addition, the blocking member <NUM> may be detachably coupled to the front cabinet <NUM>.

In addition, the lint filter cleaner <NUM> is connected to a washing water supply pipe <NUM> and a washing water drain pipe <NUM>. An inlet end of the washing water supply pipe <NUM> may be mounted on the rear cabinet <NUM> and connected to a water pipe <NUM> connected from an external water supply source <NUM>. An outlet end of the washing water supply pipe <NUM> is connected to an inlet port of a control valve <NUM> of the lint filter cleaner <NUM>. An inlet end of the washing water drain pipe <NUM> is connected to a drain pump assembly (not shown) of the lint filter cleaner <NUM>.

In addition, the air blower <NUM> includes a driving motor <NUM> rotating the drying drum <NUM> and a drying fan <NUM> connected to a rotational shaft of the driving motor <NUM>.

The drying fan <NUM> is disposed at a side of the outlet end of the guide duct <NUM> to guide the air guided to the guide duct <NUM> through the drying drum <NUM> to the exhaust duct <NUM>. In addition, the drying drum <NUM> rotates by a pulley (not shown) connected to the rotational shaft of the driving motor <NUM> and a belt wound around the pulley and an outer circumferential surface of the drying drum <NUM>. That is, if the driving motor <NUM> is rotated, the pulley rotates, and when the pulley is rotated, the belt rotates the drying drum <NUM>. With this structure, if the driving motor <NUM> operates, the drying drum <NUM> and the drying fan <NUM> are rotated in the same direction.

In addition, an electric heater is mounted inside the rear duct <NUM> of the dryer <NUM>. The electric heater generates hot air by heating air to a high temperature before the air flowing into the suction duct <NUM> is introduced into the drying drum <NUM>.

A drying process of the dryer <NUM> having the above configuration will be briefly described. First, the drying object is put into the drying drum <NUM> through an input hole <NUM> provided in the front cabinet <NUM>. If a drying start command is input through the input unit <NUM>, the air blower <NUM> operates, and the drying drum <NUM> and the drying fan <NUM> are rotated in one direction. The air flowing into the suction duct <NUM> is heated to a high temperature by the electric heater while flowing along the rear duct <NUM>. The air heated to a high temperature is introduced into the drying drum <NUM> through the rear surface of the drying drum <NUM> along the rear duct <NUM>. Here, the high-temperature dried air introduced into the drying drum <NUM> is changed into a high-temperature humid state while drying the drying object.

The high-temperature humid air is guided to the guide duct <NUM> through the blocking member <NUM> in a state of containing lint generated from the drying object. The high-temperature humid air guided to the guide duct <NUM> is guided to the exhaust duct <NUM> by the air blower <NUM>. Here, the high-temperature humid air guided to the exhaust duct <NUM> filters the lint by the lint filter assembly while passing through the lint filter cleaner <NUM>. In addition, the lint filter cleaner <NUM> operates to separate the lint attached to the lint filter assembly and discharge the lint to the outside by the drain pump assembly together with the washing water.

In addition, the processor <NUM> may control an overall operation of the dryer.

<FIG> is a block diagram for explaining the apparatus for measuring the humidity for the dryer according to an embodiment.

As illustrated in <FIG>, the dryer <NUM> may include an apparatus <NUM> for measuring humidity (hereinafter, referred to a humidity measuring apparatus) for a dryer <NUM>, which is capable of removing noise with respect to a humidity measurement signal for the drying object <NUM> inside the dryer <NUM>.

The humidity measuring apparatus <NUM> for the dryer includes a capacitance measuring sensor measuring a capacitance change amount ΔC<NUM> that is changed due to the humidity of the drying object <NUM> put into the dryer <NUM>, a shield <NUM> shielding noise generated in the dryer <NUM>, and a processor <NUM> electrically connected to the capacitance measuring sensor <NUM> and the shield <NUM>.

Here, the processor <NUM> applies a second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> to measure capacitance according to a change in humidity based on the first signal output from the capacitance measuring sensor <NUM>, thereby removing the noise.

That is, the processor <NUM> applies a second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> and acquire a capacitance change amount based on the first signal output from the capacitance measuring sensor <NUM> to measure a humidity change amount of the drying object.

For example, the noise generated in the dryer <NUM> may include parasitic capacitance generated by temperature changes, movement, electromagnetic waves, static electricity, etc. inside the dryer <NUM>, and the noise deteriorates accuracy in humidity measurement.

In addition, the capacitance measuring sensor <NUM> may set the drying object <NUM> as a virtual ground and set the capacitance measuring sensor <NUM> as a predetermined electrode to measure the capacitance change amount.

Also, the capacitance measuring sensor <NUM> may be disposed inside the dryer <NUM>. A sensing area is opened in a direction in which the drying object <NUM> is disposed.

Here, the capacitance measuring sensor <NUM> may be disposed so that remaining areas other than the sensing area face the shield <NUM>.

Also, the capacitance measuring sensor <NUM> may include an output pin outputting the first signal corresponding to the measured capacitance change amount to the processor <NUM>.

For example, the output pin of the capacitance measuring sensor <NUM> may be disposed to face the shield <NUM> and may be electrically connected to an input pin of the processor <NUM> by a connection line.

Here, the connection line may be inserted into a through-hole passing through the shield <NUM> to electrically connect the output pin of the capacitance measuring sensor <NUM> to the input pin of the processor <NUM>.

For another example, the output pin of the capacitance measuring sensor <NUM> may be disposed in a direction opposite to the shield <NUM> and may be electrically connected to the input pin of the processor <NUM> by the connection line.

Here, the connection line may be disposed to be exposed on an outer surface of the shield <NUM> to electrically connect the output pin of the capacitance measuring sensor <NUM> to the input pin of the processor <NUM>.

Next, the capacitance measuring sensor <NUM> may be disposed on the shield <NUM> and insulated from the shield <NUM>.

Here, an insulator or an insulating substrate may be disposed between the capacitance measuring sensor <NUM> and the shield <NUM>, but this is merely an example and is not limited thereto.

In some cases, the capacitance measuring sensor <NUM> and the shield <NUM> may be disposed to be spaced apart from each other to have a predetermined interval by a spacer.

Here, in the spacer, the insulator or the insulating substrate may be disposed, but this is merely an example and is not limited thereto.

The shield <NUM> may be disposed between the input pin of the processor <NUM> and the capacitance measuring sensor <NUM>, and the input pin of the processor <NUM> may receive the first signal output from the capacitance measuring sensor <NUM>.

For example, at least one through-hole through which at least one connection line passes is defined in the shield <NUM>, and the connection line may electrically connect the input pin of the processor <NUM> to the output pin of the capacitance measuring sensor <NUM>.

In addition, the shield <NUM> may be disposed between the output pin of the processor <NUM> and the capacitance measuring sensor <NUM>, and the output pin of the processor <NUM> may transmit the second signal having the same waveform and the same voltage to input pins of the capacitance measuring sensor <NUM> and the shield <NUM>.

Here, the input pin of the processor <NUM> may be electrically connected to the capacitance measuring sensor <NUM> by the connection line to receive the first signal from the capacitance measuring sensor <NUM>.

In addition, the processor <NUM> may be electrically connected to the capacitance measuring sensor <NUM> by a single connection line or a plurality of connection lines.

For an example, the processor <NUM> may receive the first signal from the capacitance measuring sensor <NUM> through the single connection line and may output the second signal to the capacitance measuring sensor <NUM>.

For another example, the processor <NUM> may receive the first signal from the capacitance measuring sensor <NUM> through a first dedicated connection line and may output the second signal to the capacitance measuring sensor <NUM> through a second dedicated connection line.

Also, the input pin of the shield <NUM> may be electrically connected to the output pin of the processor <NUM> by the connection line.

In some cases, the input pin of the shield <NUM> may be exposed to the outside of the shield <NUM> and disposed to protrude in a direction of the output pin of the processor <NUM>.

In addition, the capacitance measuring sensor <NUM> may include a front surface including the sensing area facing the drying object <NUM> and a rear surface opposite to the front surface, and the shield <NUM> may be disposed so that a top surface thereof faces a rear surface of the capacitance measuring sensor <NUM>.

Here, in the shield <NUM>, a first area corresponding to the top surface may be the same as a second area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

In some cases, in the shield <NUM>, the first area corresponding to the top surface of the shield <NUM> may be greater than the second area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

If the area of the shield <NUM> is too large, it may be difficult to install the humidity measuring apparatus <NUM>, and if it is too small, it may adversely affect the removal of the noise, and thus, it may be determined in consideration of design conditions.

In some cases, a groove having a predetermined depth may be defined in a central area of the top surface of the shield <NUM>, and the capacitance measuring sensor <NUM> may be seated in the groove.

The reason is that, when the capacitance measuring sensor <NUM> is seated in the groove of the shield <NUM>, the humidity sensing range of the capacitance measuring sensor <NUM> is adjusted to a specific area to measure the humidity of the drying object disposed on a specific area.

Here, in the shield <NUM>, an area corresponding to a bottom surface of the groove may be the same as an area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

In this case, in the shield <NUM>, the bottom surface of the groove may be insulated from the rear surface of the capacitance measuring sensor <NUM>.

Also, in the shield <NUM>, an inner surface of the groove may be insulated from a side surface of the capacitance measuring sensor <NUM>.

In some cases, in the shield <NUM>, an area corresponding to the bottom surface of the groove may be greater than an area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

Here, in the shield <NUM>, the inner surface of the groove may be disposed to be spaced a predetermined distance from the side surface of the capacitance measuring sensor <NUM>.

In this case, an insulator may be disposed in a space between the inner surface of the groove of the shield <NUM> and the side surface of the capacitance measuring sensor <NUM>.

Also, in the shield <NUM>, the bottom surface of the groove may be disposed to be spaced a predetermined distance from the rear surface of the capacitance measuring sensor <NUM>.

In this case, an insulating substrate may be disposed in a space between the bottom surface of the groove of the shield <NUM> and the rear surface of the capacitance measuring sensor <NUM>.

In addition, in the shield <NUM>, a depth value of the groove may be greater than a height value of the capacitance measuring sensor <NUM> so that the front surface of the capacitance measuring sensor <NUM> is not exposed to the outside of the groove.

In some cases, in the shield <NUM>, the depth value of the groove may be less than or equal to the height value of the capacitance measuring sensor <NUM> so that the front surface of the capacitance measuring sensor <NUM> is exposed to the outside of the groove.

Here, as the depth value of the groove of the shield <NUM> increases, the humidity sensing range of the capacitance measuring sensor <NUM> becomes narrower, and as the depth value of the groove the shield <NUM> decreases, the humidity sensing range of the capacitance measuring sensor <NUM> becomes wider.

As such, in the present disclosure, the humidity sensing range of the capacitance measuring sensor <NUM> may be adjusted by adjusting the depth of the groove of the shield <NUM> to accurately and precisely measure the humidity.

In addition, the shield <NUM> may be provided so that the inner surface of the groove is inclined at a predetermined inclination with respect to the bottom surface of the groove.

Here, the shield <NUM> may determine the sensing range of the capacitance measuring sensor <NUM> according to an angle between the inner surface of the groove and the bottom surface of the groove.

For example, the shield <NUM> may allow the angle between the inner surface of the groove and the bottom surface of the groove to increase to increase in sensing range of the capacitance measuring sensor <NUM>, and allow the angle between the inner surface of the groove and the bottom surface of the groove to decrease so as to reduce the sensing range of the capacitance measuring sensor.

In some cases, in the shield <NUM>, the inner surface of the groove may be perpendicular to the bottom surface of the groove.

Here, the shield <NUM> may be disposed so that the inner surface of the groove surrounds the side surface of the capacitance measuring sensor <NUM>.

As an example, the shield <NUM> may be disposed so that, when the insulating substrate is disposed under the capacitance measuring sensor <NUM>, the inner surface of the groove surrounds the side surface of the capacitance measuring sensor <NUM> and the side surface of the insulating substrate.

Next, the processor <NUM> may acquire the capacitance change amount ΔC<NUM> in the direction of the drying object <NUM> measured from the capacitance measuring sensor <NUM>.

Also, the processor <NUM> may measure the change in humidity of the drying object <NUM> based on the capacitance change amount.

Subsequently, the processor <NUM> may apply the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> to measure capacitance according to a change in humidity based on the first signal output from the capacitance measuring sensor <NUM>, thereby removing the noise.

For example, the processor <NUM> may output the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> and may receive the first signal corresponding to the second signal from the capacitance measuring sensor <NUM>.

Here, the first signal may be a signal having a waveform and voltage corresponding to the voltage applied to the capacitance measuring sensor <NUM> and may measure a capacitance change amount during discharge.

The processor <NUM> may output the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> to remove parasitic capacitance between the drying object <NUM> and the capacitance measuring sensor <NUM>.

For example, the processor <NUM> may simultaneously output the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM>.

For another example, the processor <NUM> may output the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> while the first signal is input from the capacitance measuring sensor <NUM>.

For another example, the processor <NUM> may output the second signal having the same waveform and the same voltage to the capacitance measuring sensor <NUM> and the shield <NUM> while the first signal is output from the capacitance measuring sensor <NUM>.

For another example, when the first signal is output from the capacitance measuring sensor <NUM>, the processor <NUM> may receive the first signal through the connection line through which the second signal is output to the capacitance measuring sensor <NUM> or may receive the first signal through separate another connection line.

Here, the processor <NUM> may output the second signal for removing the noise to the capacitance measuring sensor <NUM> and the shield <NUM>, based on a second signal having a preset waveform and voltage and a second signal having a pre-learned waveform and voltage.

According to the invention, the processor <NUM> inputs the capacitance change amount to a pre-trained neural network model to predict and output the signal having the waveform and voltage for the noise removal.

In this case, the neural network model may be pre-trained using the capacitance change amount inside the dryer <NUM> as an input value.

In addition, the dryer <NUM> according to the present disclosure may include constituents of an artificial intelligence device and perform a function of the artificial intelligence device.

Also, the term "dryer" may be used interchangeably with the term artificial intelligence dryer.

In addition, the processor <NUM> may collect history information including operation contents of the artificial intelligence device or user's feedback on the operation and may store the collected history information in a memory or a learning processor or transmit the collected history information to the external device such as an artificial intelligence server.

Here, the collected history information may be used to update a learning model.

The processor <NUM> may control at least part of the components of artificial intelligence device so as to drive an application program stored in memory. Furthermore, the processor <NUM> may operate two or more of the components included in the artificial intelligence device in combination so as to drive application program.

Throughout this specification, the terms the neural network, the network function, and the neural network may be used as identical means.

The above-described neural network model may be an artificial neural network (ANN) trained to output reconstructed data that is similar to the input data with respect to the input data. The artificial neural network (ANN) may be a model used in machine learning and may mean an overall model having problem-solving ability which is constituted by artificial neurons (nodes) that form a network through synaptic connection.

For example, the neural network model may be an autoencoder-based artificial neural network model. The autoencoder-based neural network model may include an encoder portion that dimensionally reduces the data by reducing the number of neurons in a hidden layer rather than the number of neurons in an input layer and a decoder part that reconstructs the data by dimensionally expanding the data from the hidden layer again and has an output layer having the same number of neurons as the number of neurons in the input layer, but is not limited thereto.

Also, the neural network model may be an artificial neural network model based on a generative adversarial network (GAN). The generative adversarial network (GAN) may be an artificial neural network in which a generator and a discriminator are adversarially learned, but is not limited thereto.

Also, the neural network model may be a deep neural network. A deep neural network (DNN) may refer to a neural network including a plurality of hidden layers in addition to an input layer and an output layer. The deep neural networks may be used to identify latent structures of data. That is, it may identify a potential structure of photos, texts, videos, voices, and music (e.g., what objects are in the photos, what the text and emotions are, what the texts and emotions are, etc.). The deep neural network may include a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted boltzmann machine (RBM), and a deep belief network (DBN), a Q network, an U network, a Siamese network, and the like.

As described above, in the apparatus for measuring the humidity for the dryer according to the present disclosure, the noise on the measurement signal may be removed by using the capacitance measuring sensor and the active shield, and a signal-to-noise ratio may be minimized to accurately and precisely measure the humidity of the drying object.

In addition, in the apparatus for measuring the humidity for the dryer, a humidity sensing range may be adjusted to an optimal area by using the active shield to accurately and precisely measure the humidity of the drying object, which is disposed at the specific area.

<FIG> and <FIG> are views for explaining a size of the shield of the apparatus for measuring the humidity according to an embodiment.

Referring to <FIG> and <FIG>, the capacitance measuring sensor <NUM> may include a front surface including a sensing area facing the drying object and a rear surface opposite to the front surface, and the shield <NUM> may be disposed so that a top surface thereof faces a rear surface of the capacitance measuring sensor <NUM>.

As illustrated <FIG>, in the shield <NUM>, a first area corresponding to the top surface may be the same as a second area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

In some cases, as illustrated in <FIG>, in the shield <NUM>, the first area corresponding to the top surface of the shield <NUM> may be greater than the second area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

<FIG> and <FIG> are views for explaining a shield groove of the apparatus for measuring the humidity for the dryer according to an embodiment.

As illustrated in <FIG> and <FIG>, a groove having a predetermined depth may be defined in a central area of the top surface of the shield <NUM>, and the capacitance measuring sensor <NUM> may be seated in the groove.

As illustrated in <FIG>, an area corresponding to a bottom surface of the groove may be the same as an area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

Here, in the shield <NUM>, the bottom surface of the groove may be insulated from the rear surface of the capacitance measuring sensor <NUM>, and the inner surface of the groove may be insulated from the side surface of the capacitance measuring sensor <NUM>.

In some cases, as illustrated in <FIG>, in the shield <NUM>, an area corresponding to the bottom surface of the groove may be greater than an area corresponding to the rear surface of the capacitance measuring sensor <NUM>.

As such, in the present disclosure, as illustrated in <FIG> and <FIG>, the shield <NUM> may have a structure in which a groove is formed in a single body shape, and the capacitance measuring sensor <NUM> is seated in the groove.

Here, according to the change in area and depth of the groove of the shield <NUM> and the change in interval between the groove and the sensor electrode, the signal-to-noise ratio for the noise signal input in a horizontal direction may increase to increase in sensing distance.

As another case, the shield <NUM> according to the present disclosure may have a structure in which a flat first shield mounted on the bottom surface of the capacitance measuring sensor <NUM> and a ring-shaped second shield surrounding the side surface of the capacitance measuring sensor <NUM> are stacked.

Here, according to a change in width of the ring-shaped second shield of the shield <NUM> and a change in interval between the second shield and the sensor electrode, the signal-to-noise ratio may increase to increase in sensing distance.

<FIG> is a view for explaining insulation between the shield and the capacitance measuring sensor of the apparatus for measuring the humidity according to an embodiment.

As illustrated in <FIG>, a groove having a predetermined depth may be defined in a central area of the top surface of the shield <NUM>, and the capacitance measuring sensor <NUM> may be seated in the groove.

Here, an insulator may be disposed in a space between the inner surface of the groove of the shield <NUM> and the side surface of the capacitance measuring sensor <NUM>.

Here, an insulating substrate <NUM> may be disposed in a space between the bottom surface of the groove of the shield <NUM> and the rear surface of the capacitance measuring sensor <NUM>.

<FIG> is a view for explaining a depth of the shield groove of the apparatus for measuring the humidity according to an embodiment.

As illustrated in <FIG>, a depth value d of the groove may be greater than a height value h of the capacitance measuring sensor <NUM> so that the front surface of the capacitance measuring sensor <NUM> is not exposed to the outside of the groove.

In some cases, in the shield <NUM>, the depth value d of the groove may be less than or equal to the height value h of the capacitance measuring sensor <NUM> so that the front surface of the capacitance measuring sensor <NUM> is exposed to the outside of the groove.

Here, as the depth value d of the groove of the shield <NUM> increases, the humidity sensing range of the capacitance measuring sensor <NUM> becomes narrower, and as the depth value h of the groove the shield <NUM> decreases, the humidity sensing range of the capacitance measuring sensor <NUM> becomes wider.

As such, in the present disclosure, the humidity sensing range of the capacitance measuring sensor <NUM> may be adjusted by adjusting the depth value d of the groove of the shield <NUM> to accurately and precisely measure the humidity.

<FIG> and <FIG> are views for explaining electrical connection of the processor of the apparatus for measuring the humidity according to an embodiment.

As illustrated in <FIG> and <FIG>, the capacitance measuring sensor <NUM> may include an output pin 311a outputting a first signal corresponding to the measured capacitance change amount to the processor <NUM>.

For example, as illustrated in <FIG>, the output pin 311a of the capacitance measuring sensor <NUM> may be disposed to face the shield <NUM> and be electrically connected to the input pin 313a of the processor <NUM> by a connection line <NUM>.

Here, the connection line <NUM> is inserted into a through-hole <NUM> passing through the shield <NUM> to electrically connect an output pin 311a of the capacitance measuring sensor <NUM> to the input pin 313a of the processor <NUM>.

For another example, the output pin 311a of the capacitance measuring sensor <NUM> may be disposed in a direction opposite to the shield <NUM> and may be electrically connected to the input pin 313a of the processor <NUM> by the connection line <NUM>.

Here, the connection line <NUM> may be disposed to be exposed on an outer surface of the shield <NUM> to electrically connect the output pin 311a of the capacitance measuring sensor <NUM> to the input pin 313a of the processor <NUM>.

<FIG> are views for explaining the sensing range of the apparatus for measuring the humidity according to an embodiment.

Referring to <FIG>, a groove having a predetermined depth may be defined in a central area of the top surface of the shield <NUM>, and the capacitance measuring sensor <NUM> may be seated in the groove.

Here, in the shield <NUM>, an inner surface of the groove may be defined to be inclined at a predetermined inclination with respect to a bottom surface of the groove, and the inner surface of the groove of the shield <NUM> may be disposed perpendicular to the bottom surface of the groove.

As such, the shield <NUM> may determine the sensing range of the capacitance measuring sensor <NUM> according to an angle θ between the inner surface of the groove and the bottom surface of the groove.

As illustrated in <FIG>, when the angle θ between the inner surface of the groove and the bottom surface of the groove of the shield <NUM> is an acute angle, the capacitance measuring sensor <NUM> may have a first sensing range.

In addition, as illustrated in <FIG>, when the angle θ between the inner surface of the groove and the bottom surface of the groove of the shield <NUM> is a right angle, the capacitance measuring sensor <NUM> may have a second sensing range wider than the first sensing range.

In addition, as illustrated in <FIG>, when the angle θ between the inner surface of the groove and the bottom surface of the groove of the shield <NUM> is an obtuse angle, the capacitance measuring sensor <NUM> may have a third sensing range wider than the second sensing range.

As such, the shield <NUM> may allow the angle θ between the inner surface of the groove and the bottom surface of the groove to increase to increase in sensing range of the capacitance measuring sensor <NUM>, and allow the angle θ between the inner surface of the groove and the bottom surface of the groove to decrease so as to reduce the sensing range of the capacitance measuring sensor.

<FIG> is a view for explaining a sensing range corresponding to whether the apparatus for measuring the humidity is sealed and a shape of the shield according to an embodiment.

In the graph of <FIG>, the term "sensor only" means a sensing range of the humidity measuring apparatus when there is only the measuring sensing electrode, the term "passive" means a sensing range of the humidity measuring apparatus when an area of the shield is the same as that of the capacitance measuring sensor, and the term "active" means a sensing range of the humidity measuring apparatus in which an area of the shield and an area of the capacitance measuring sensor are the same, and the same voltage is applied to the sensing electrode and the shield.

As illustrated in <FIG>, in the sensing range of the humidity measuring apparatus in which the capacitance measuring sensor is seated in the groove of the shield, a magnitude of the signal is reduced, but the reduction of the noise increases, and thus, sensing sensitivity is improved based on the signal-to-noise ratio (SNR) to accurately and precisely measure the humidity.

In addition, the sensing range of the humidity measuring apparatus in which the capacitance measuring sensor is seated in the groove of the shield, and the same voltage is applied to the shield and the sensing electrode, removal of parasitic capacitance between the sensor and the shield and focusing of electric fields are performed to remove noise while maintain the magnitude of the signal and further improve sensing sensitivity based on the signal-to-noise ratio, thereby accurately and precisely measuring the humidity.

On the other hand, in the sensing range of the humidity measuring apparatus without the shield, sensing sensitivity for a specific area may be deteriorated, and noise may be generated, and thus, the humidity measurement may be inaccurate.

As such, in the present disclosure, since the signal-to-noise ratio is improved according to a sensing distance, the humidity may be precisely and accurately sensed.

As described above, in the apparatus for measuring the humidity for the dryer according to the present disclosure, the noise on the measurement signal may be removed by using the capacitance measuring sensor and the active shield, and a signal-to-noise ratio may be maximized to increase in humidity sensing distance, thereby accurately and precisely measuring the humidity of the drying object.

<FIG> is a flowchart for explaining a method for measuring humidity in the apparatus for measuring the humidity according to an embodiment.

As illustrated in <FIG>, a processor of a humidity measuring apparatus may apply a second signal having the same waveform and the same voltage to a capacitance sensor and a shield (S10).

Here, the processor may remove noise by applying a second signal having the same waveform and the same voltage to the capacitance sensor and the shield.

Here, the first signal may be a signal having a waveform and voltage corresponding to a capacitance change amount measured by the capacitance measuring sensor.

As such, the processor may output the second signal having the same waveform and the same voltage to the capacitance sensor and the shield to remove parasitic capacitance between a drying object and the capacitance measuring sensor.

Next, the processor may acquire the capacitance change amount measured by the capacitance measuring sensor (S20).

Here, the capacitance measuring sensor may measure the capacitance change amount by setting the drying object as a virtual ground and setting the capacitance measuring sensor as a predetermined electrode.

The processor may acquire the capacitance change amount from which noise including parasitic capacitance is removed.

Next, the processor may measure a change in humidity of the drying object based on the acquired change in capacitance (S30).

Here, the processor may measure a change in humidity of the drying object based on a change in capacitance from which the noise is removed and control a drying operation of a dryer based on the measured change in humidity of the drying object.

<FIG> are views for explaining adjustment of a sensing range of the apparatus for measuring the humidity according to an embodiment.

As illustrated in <FIG>, in the humidity measuring apparatus according to the present disclosure, a shield <NUM> may be disposed on a rear surface of the capacitance measuring sensor <NUM>.

Here, the rear surface of the capacitance measuring sensor <NUM> may be a surface facing a wall surface of the dryer, and the shield <NUM> may be disposed between the wall surface of the dryer and the capacitance specific sensor <NUM>.

In addition, a front surface of the capacitance measuring sensor <NUM> may be a sensing surface facing a drying object and may sense humidity of the drying object at a first sensing angle.

Subsequently, as illustrated in <FIG>, in the humidity measuring apparatus according to the present disclosure, the shield <NUM> may be disposed on the rear surface and a side surface of the capacitance measuring sensor <NUM>.

Here, the capacitance measuring sensor <NUM> may have a structure in which the rear and side surfaces of the capacitance measuring sensor <NUM> are covered by the shield <NUM> by being mounted in a groove of the shield <NUM>.

In this case, a sensing angle of the capacitance measuring sensor <NUM> may be adjusted due to changes in electric fields in vertical and horizontal directions generated from the sensor electrodes.

That is, since the capacitance measuring sensor <NUM> mounted on the shield <NUM> of the structure (b) has a second sensing range less than a first sensing range of the capacitance measuring sensor <NUM> mounted on the shield <NUM> of the structure (a), the signal-to-noise ratio in the sensing area may be improved.

In addition, in the present disclosure, the sensing range according to a change in distance between the sensor electrode and the side shield <NUM> and a change in width of the sensor electrode and the side shield <NUM> may be adjusted.

As such, in the present disclosure, the structure of the shield <NUM> may be modified into various shapes, and thus, the sensing angle may be adjusted by adjusting the electric fields in the vertical and horizontal directions, and the signal-to-noise ratio may increase due to the width of the shield surrounding the side surface of the capacitance measuring sensor <NUM> and the change in interval therebetween.

<FIG> is a graph for explaining an interference effect of a side surface of a sensor depending on whether the side shield <NUM> of the apparatus for measuring the humidity is provided according to an embodiment.

As illustrated in <FIG>, a humidity measuring apparatus b including the side shield <NUM> is less affected by sensor side interference when compared to a humidity measuring apparatus a, which does not include the side shield.

In the humidity measuring apparatus b including the side shield <NUM>, the vertical and horizontal electric fields generated from the sensor electrode may be focused, and thus, the sensing angle may be less than that of the humidity measuring apparatus a, which does not include the side shield <NUM> to reduce noise generated in a lateral direction, thereby improving the signal-to-noise ratio (SNR) in the vertical direction.

In addition, in the apparatus for measuring the humidity for the dryer, the humidity sensing range may be adjusted to an optimal area by using the active shield to accurately and precisely measure the humidity of the drying object, which is disposed at the specific area.

The embodiments of the present disclosure is to be considered illustrative, and not restrictive, and the technical spirit of the present disclosure is not limited to the foregoing embodiment.

Therefore, the scope of the present disclosure is defined by the appended claims.

According to the humidity measuring apparatus for the dryer according to the present disclosure, the capacitance measuring sensor and the active shield are used to remove the noise for the measurement signal and maximize the signal-to-noise ratio, thereby accurately and precisely measuring the humidity of the drying object, and thus, the industrial applicability is remarkable.

According to the embodiment, in the apparatus for measuring the humidity for the dryer, the noise on the measurement signal is removed by using the capacitance measuring sensor and the active shield, and the signal-to-noise ratio is minimized to accurately and precisely measure the humidity of the object to be dried.

Claim 1:
An apparatus (<NUM>) for measuring humidity for a dryer (<NUM>), the apparatus comprising:
a capacitance measuring sensor (<NUM>) configured to measure an amount of capacitance change that is changed due to humidity of an object to be dried (<NUM>), which is put into the dryer, the capacitance measuring sensor having a sensing area opened in a direction of the object to be dried;
a shield (<NUM>) configured to shield noise generated in the dryer; and
a processor (<NUM>) electrically connected to the capacitance measuring sensor and the shield,
wherein the processor is configured to:
apply a second signal having the same waveform and the same voltage to the capacitance measuring sensor and the shield; and
acquire the amount of capacitance change, based on a first signal output from the capacitance measuring sensor so as to measure an amount of humidity change of the object to be dried,
characterized in that:
the processor is configured to input the capacitance change amount to a pre-trained neural network model to predict and output the second signal having the waveform and voltage for noise removal.