Purification device and control method thereof

Abstract

A filtration device can include a flow path, a valve disposed on the flow path, a first light source to emit a first light including ultraviolet light toward the flow path, a second light source to emit a second light including visible light or infrared light toward the flow path, a first optical sensor disposed outside of a path of the first light and the second light, an electrode disposed on the flow path, and a processor electrically connected to the valve, the first light source, the second light source, the first optical sensor, and the electrode. The processor can alternately operate the first light source and the second light source, receive a first signal from the first optical sensor while controlling the first light source to emit the first light, and control the valve and the electrode to sterilize the flow path based on the first signal.

Description

Technical Field

[0001] This disclosure relates to a filtering device and its control method, and more specifically, to a filtering device and its control method capable of interacting with a user. Background Technology

[0002] A filtration device is a device that removes harmful substances from a source liquid (such as tap water or groundwater) by using various purification methods (such as sedimentation, filtration, and disinfection) to provide drinking water to a user. For example, a filtration device can be provided in which one or more filters filter an incoming liquid to provide a clean liquid to the user.

[0003] Based on their shape, filtration devices are divided into direct-connection types, which connect directly to a faucet, and storage types, which allow liquid to be placed in a container and passed through the filter. Furthermore, according to the filtration principle or method, filtration devices can be classified as natural filtration, direct filtration, ion exchange resin type, distillation type, and reverse osmosis type.

[0004] The liquid filtered by the filtration device is discharged through a dispenser and can be used for drinking or cooking.

[0005] Conventional filtration devices periodically clean and / or disinfect the flow path through which the liquid passes. Due to the periodic cleaning and / or disinfection, it may be necessary to perform cleaning and / or disinfection unnecessarily frequently, or even if cleaning and / or disinfection is required, it may not be performed in a timely manner. Summary of the Invention

[0006] Technical issues

[0007] Therefore, one aspect of this disclosure is to provide a filtration device and a control method thereof, the filtration device being able to identify the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter.

[0008] Another aspect of this disclosure is to provide a filtration device and a control method thereof, which is capable of initiating cleaning and / or disinfecting the flow path through which the liquid passes based on the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter.

[0009] Another aspect of this disclosure is to provide a filtration device and a control method thereof, which is capable of adjusting the duration of cleaning and / or disinfection of the flow path through which the liquid passes based on the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter.

[0010] Additional aspects of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this disclosure.

[0011] Technical solution

[0012] According to one aspect of this disclosure, a filtration device includes: a flow path; a valve disposed on the flow path; a first light source configured to emit first light including ultraviolet (UV) light toward the flow path; a second light source configured to emit second light including visible light or infrared light toward the flow path; a first optical sensor located outside the paths of the first and second light sources; electrodes disposed on the flow path; and a processor electrically coupled to the valve, the first light source, the second light source, the first optical sensor, and the electrodes. The processor is configured to alternately operate the first light source to emit the first light and the second light source to emit the second light, receive a first signal from the first optical sensor while the first light source emits the first light, and control the valve and electrodes based on the first signal to disinfect the flow path.

[0013] According to another aspect of this disclosure, a control method for a filtration device includes a flow path, a valve disposed on the flow path, and an electrode disposed on the flow path. The control method includes: alternately operating a first light source and a second light source, the first light source being configured to emit first light including ultraviolet (UV) light toward the flow path, and the second light source being configured to emit second light including visible light or infrared light toward the flow path; identifying a first signal corresponding to the intensity of light received by a first optical sensor while the first light source emits the first light; and controlling the valve and electrode based on the first signal to disinfect the flow path.

[0014] According to another aspect of this disclosure, a filtration device includes: a flow path; a filter disposed on the flow path; at least one valve disposed on the flow path; an electrolysis device disposed on the flow path; a first light source configured to emit first light including ultraviolet (UV) light; a second light source configured to emit second light including visible light or infrared light; a first optical sensor; and a processor electrically coupled to at least one valve, the electrolysis device, the first light source, the second light source, and the first optical sensor. The processor is configured to receive a first signal from the first optical sensor while the first light source emits the first light, and is configured to control at least one valve and the electrolysis device to disinfect the flow path based on the amplitude of the first signal being greater than the first reference value; and is configured to receive a second signal from the second optical sensor while the second light source emits the second light, and is configured to control at least one valve to clean the flow path based on the amplitude of the second signal being greater than the second reference value.

[0015] Beneficial effects

[0016] According to one aspect of this disclosure, the filtration device can identify the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter.

[0017] According to one aspect of this disclosure, the filtration device can begin cleaning and / or disinfecting the flow path through which water passes based on the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter.

[0018] The filtration device can adjust the duration of cleaning and / or disinfecting the flow path of the liquid based on the degree of contamination of the filtered liquid caused by organic matter and the degree of contamination of the filtered liquid caused by inorganic matter. Attached Figure Description

[0019] Figure 1 This is a schematic view illustrating a filtering device according to various embodiments of the present disclosure;

[0020] Figure 2 This is a view showing the flow path inside the filter body of a filter device according to various embodiments of the present disclosure;

[0021] Figure 3 This is a view illustrating the configuration of a filtering device according to various embodiments of the present disclosure;

[0022] Figure 4 This is a view showing the dispenser and user interface of a filtering device according to various embodiments of the present disclosure;

[0023] Figure 5 This is a view showing the optical sensor of a filtering device according to various embodiments of the present disclosure;

[0024] Figure 6 This is a view illustrating an operational example of a first light source of a filtering apparatus according to various embodiments of the present disclosure;

[0025] Figure 7 This is a view illustrating an operational example of the second light source of a filtering device according to various embodiments of the present disclosure;

[0026] Figure 8 This is a view illustrating an example of a filtering device controlling an optical sensor according to various embodiments of the present disclosure;

[0027] Figure 9 This is a view showing the configuration of the first optical sensor of a filtering device according to various embodiments of the present disclosure;

[0028] Figure 10 It is shown Figure 9 A view of an example of the first optical sensor shown;

[0029] Figure 11 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure;

[0030] Figure 12 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure;

[0031] Figure 13 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure;

[0032] Figure 14 This is a view illustrating examples of a filtration device cleaning a flow path according to various embodiments of the present disclosure;

[0033] Figure 15 This is a view illustrating an example of a filtration device disinfecting a flow path according to various embodiments of the present disclosure;

[0034] Figure 16 This is a flowchart illustrating a method for cleaning / disinfecting a flow path using a filtration apparatus according to various embodiments of the present disclosure; and

[0035] Figure 17 This is a flowchart illustrating a method for identifying the concentration of organic or inorganic matter in a flow path using a filtration apparatus according to various embodiments of the present disclosure. Detailed Implementation

[0036] The following description Figures 1 to 17 The various embodiments described in this patent document to illustrate the principles of this disclosure are for illustrative purposes only and should not be construed as limiting the scope of this disclosure. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged system or device.

[0037] In the following description, similar reference numerals throughout the specification denote similar elements. Well-known functions or structures are not described in detail further, as they would obscure one or more exemplary embodiments with unnecessary detail. Terms such as “unit,” “module,” “component,” and “block” can refer to hardware or software. According to embodiments, multiple “units,” “modules,” “components,” and “blocks” may be implemented as a single component, or a single “unit,” “module,” “component,” and “block” may include multiple components.

[0038] It should be understood that when a component is referred to as being “coupled” to another component, it can be directly or indirectly connected to the other component, where indirect connection includes “connection via a wireless communication network”.

[0039] Furthermore, when a component “comprises” or “includes” an element, the component may also include other elements without excluding them, unless otherwise specifically described.

[0040] Throughout the specification, when one component is "on" another component, this includes not only when the component is in contact with the other component, but also when there is another component between the two components.

[0041] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this document, one should not be limited by these terms. These terms are only used to distinguish one element from another.

[0042] As used herein, the singular forms “a,” “one,” and “the” are intended to also include the plural forms, unless the context explicitly indicates otherwise.

[0043] The identification codes are used for ease of description, but are not intended to indicate the order of each step. Each step may be performed in a different order than that shown, unless the context explicitly indicates otherwise.

[0044] Reference will now be made in detail to embodiments of this disclosure, examples of which are shown in the accompanying drawings.

[0045] Figure 1 This is a schematic view illustrating a filtering device according to various embodiments of the present disclosure.

[0046] refer to Figure 1 The filtration device 1 may include a filter body 10 and a distributor 50 connected to the filter body 10 to discharge liquid to the outside of the filter body 10. The filter body 10 may be arranged under the kitchen countertop 2, and the distributor 50 may be arranged above the kitchen countertop 2. The kitchen countertop 2 may include a sink top. The sink top may include a sink and a kitchen countertop.

[0047] Dispenser 50 can be rotatably mounted on the upper part of kitchen countertop 2. For example, dispenser 50 can be rotatably mounted above the sink. Dispenser 50 can be connected to filter 10 via connecting pipe 40.

[0048] The filter element 10 can be arranged inside the kitchen worktop 2. The filter element 10 may include a filtration unit 20 and a heat exchange unit 30. The filtration unit 20 includes at least one filter 21, and the heat exchange unit 30 is used to cool or heat the liquid filtered by the filtration unit 20. The heat exchange unit 30 may include a cooler and a heater.

[0049] The filter 10 can receive source liquids such as tap water through an external pipe 43.

[0050] The filter body 10 may include a first pipe 41 connecting the filter body 10 to the distributor 50 and a second pipe 42 connecting the filter body 10 to the faucet 80 installed in the kitchen countertop 2.

[0051] The mounting member 3 for installing the distributor 50 can be disposed in the kitchen countertop 2. The mounting member 3 can be disposed in an opening formed in at least a portion of the kitchen countertop 2. The distributor 50 can be connected to the first pipe 41 through the mounting member 3 of the kitchen countertop 2.

[0052] Dispenser 50 can be rotatably mounted on mounting member 3. Filter device 1 may include rotating member 60 configured to rotatably mount dispenser 50 to mounting member 3. Rotating member 60 may be coupled to kitchen countertop 2.

[0053] The filter device 1 may include a pipe fixing member 70 configured to fix pipes 41 and 42. The pipe fixing member 70 may be disposed inside the kitchen countertop 2. The pipe fixing member 70 may be disposed between the filter body 10 and the dispenser 50. The pipe fixing member 70 may be fixed to at least one of the filter body 10 and the kitchen countertop 2. A portion of pipes 41 and 42 may be wound around the pipe fixing member 70, and the length of pipes 41 and 42 extending from the fixing member may increase or decrease as a portion of pipes 41 and 42 is unwound or wound around the pipe fixing member 70.

[0054] Figure 2 This is a view showing the flow path inside the filter body of a filter device according to various embodiments of the present disclosure.

[0055] refer to Figure 2 The filter body 10 can be equipped with a source path 91 through which a source liquid, such as tap water, is introduced from the outside; filter paths 92 and 93 extending from the source path 91 to the distributor 50; or discharge paths 97 and 98 branching from the filter path 92. A filter 21 installed in the filter paths 92 and 93 to filter the source liquid and a discharge port 99 configured to discharge the liquid in the filter device 1 to the outside can be provided within the filter body 10. The flow path provided in the filter device 1 can be formed by multiple pipes.

[0056] Source path 91 is connected to external pipe 43, so source liquid can be introduced into source path 91. Source path 91 may include source valve 141 for regulating the inflow of source liquid and regulator 91a for reducing the pressure of source liquid.

[0057] According to various embodiments, source path 91 may also include a sediment filter configured to remove sediment contained in the source liquid, or a high-turbidity water filter configured to remove relatively large particles.

[0058] Filter paths 92 and 93 may include a first filter path 92 and a second filter path 93. The first filter path 92 may be connected to the source path 91 to receive source liquid from the source path 91, and may be connected to the second filter path 93. The second filter path 93 may extend to the dispenser 50.

[0059] The filter 21 for filtering the source liquid can be located in the first filtration path 92. The filter 21 may include a pre-carbon filter that adsorbs volatile substances (such as chlorine and chlorine byproducts) from the source liquid, a membrane filter that filters out relatively small contaminants by reverse osmosis pressure, and a post-carbon filter that affects the odor of the discharged liquid. In this case, the filter 21 may be connected in the order of pre-carbon filter, membrane filter, and post-carbon filter, and the source liquid introduced into the filter 21 may be filtered while passing through the pre-carbon filter, membrane filter, and post-carbon filter in sequence.

[0060] The description of the filter type of filter 21 may only be an example applicable to the embodiment of filter device 1, and the embodiment of filter device 1 is not limited to the above example. Therefore, other types of filters besides the above example can be arranged in different numbers and different arrangements.

[0061] The first filter valve 142 can be located downstream of the filter 21 to control the flow of liquid filtered by the filter 21.

[0062] According to an embodiment of the filter device 1, upstream and downstream, as well as front and rear, are defined according to the direction of liquid flow introduced into the filter device 1. The side closer to the direction in which the source liquid flows from the outside is defined as upstream or front, and the side closer to the direction in which the source liquid is discharged or discharged to the outside is defined as downstream or rear.

[0063] A flow sensor 130 can be disposed in the first filtration path 92 to detect the flow rate in the first filtration path 92. For example, the flow sensor 130 can be disposed downstream of the filter 21. The flow sensor 130 can detect the flow rate of the liquid passing through it as liquid passes through it. For example, liquid can be discharged through the distributor 50 in response to the opening of filter valves 142 and 143. The flow sensor 130 can output an electrical signal (e.g., a current signal or a voltage signal) corresponding to the flow rate of the liquid passing through it.

[0064] The filtration device 1 may include a disinfectant solution path 94, which is configured as a bypass filter 21 and generates a disinfectant solution by processing the liquid. One end of the disinfectant solution path 94 may be connected to the downstream side of the regulator 91a, and the other end of the disinfectant solution path 94 may be connected to the downstream side of the first filter valve 142. For example, the first filter path 92 may be integrally connected to the source path 91, and the disinfectant solution path 94 may bypass the source path 91. Therefore, the source liquid can pass through at least one of the first filter path 92 and the disinfectant solution path 94.

[0065] A disinfectant solution generator 94a can be installed in a disinfectant solution path 94 to generate a disinfectant solution, and a disinfectant solution valve 144 can be installed in a disinfectant solution path 94 to control the inflow of source liquid from source path 91.

[0066] The disinfectant solution generator 94a can be implemented as an electrolytic device that generates disinfectant substances through an electrolyte. For example, the disinfectant solution generator 94a may include a positive electrode 94b and a negative electrode 94c, and a voltage can be applied between the positive electrode 94b and the negative electrode 94c. At the negative electrode 94c, hydrogen ions in the liquid gain electrons to generate hydrogen molecules. At the positive electrode 94b, chloride ions in the liquid lose electrons to generate chlorine molecules. The chlorine molecules generated at the positive electrode 94b combine with liquid molecules (e.g., water molecules) to generate hypochlorous acid (HOCl-), hydrogen ions, and chloride ions. Hydrogen ions and chloride ions can be converted into hydrogen molecules and chlorine molecules at the negative electrode and positive electrode 94b, respectively. Through electrolysis at the positive electrode 94b and the negative electrode 94c, the concentration of hypochlorous acid (HOCl-) in the liquid can be increased. In this case, hypochlorous acid (HOCl-) can be used as a weak acid as a bleaching agent, oxidant, deodorant, disinfectant, etc., and the liquid containing hypochlorous acid (HOCl-) can be used as a disinfectant solution.

[0067] However, the disinfectant solution generator 94a is not limited to the examples described above, and may include devices of known types for generating disinfectant solutions. For example, an ultraviolet (UV) lamp or a light-emitting diode (LED) lamp may be provided.

[0068] The filtration device 1 may also include a hot / cold water device for providing cold or hot water, and the hot / cold water device may include a heat exchanger. The hot / cold water device may be located downstream of the first filtration path 92.

[0069] The first filtration path 92 can branch into a second filtration path 93, a hot water path 95, and a cold water path 96 downstream of the first filtration valve 142.

[0070] A heater 150 may be installed on the hot water path 95 to heat the liquid, and a hot water valve 145 is configured to open and close the hot water path 95. In this configuration, a first end of the hot water path 95 may be connected upstream of the second filter valve 143, and a second end of the hot water path 95 may be connected downstream of the second filter valve 143.

[0071] A cooler 160 may be installed on a cold water path 96 to cool liquid, and a cold water valve 146 is configured to open and close the cold water path 96. In this configuration, a first end of the cold water path 96 may be connected upstream of a second filter valve 143, and a second end of the cold water path 96 may be connected downstream of the second filter valve 143.

[0072] The first discharge path 97 can branch off from the second filter path 93 downstream of the second filter valve 143. That is, the first discharge path 97 can branch off from the second filter path 93 downstream of the second filter valve 143 and connect to the discharge port 99 so as to allow liquid in the first filter path 92 and the second filter path 93 to be discharged to the outside.

[0073] A first discharge valve 147 may be provided on the first discharge path 97 to control the flow of liquid by opening and closing the first discharge path 97, and a check valve may be provided on the first discharge path 97 to prevent backflow of liquid. In response to the opening of the first discharge valve 147, liquid flowing through the first filter path 92 and the second filter path 93 may be introduced into the first discharge path 97 and then discharged to the outside through the discharge port 99 of the filter device 1 connected to the end of the first discharge path 97.

[0074] One end of the second filtration path 93 can be connected to the distributor 50. The second filter valve 143 can be located downstream of the first filter valve 142 and upstream of the distributor 50 to control the flow of liquid. That is, in response to the opening of the first filter valve 142 and the second filter valve 143, the liquid filtered by the filter 21 can be discharged to the outside through the distributor 50 located at the ends of the filtration paths 92 and 93.

[0075] The filter device 1 may include a second discharge path 98 branching from the filter 21 and connected to the discharge port 99. For example, the second discharge path 98 may guide residual liquid in the filter 21 to the discharge port 99.

[0076] In this case, a second discharge valve 148 can be provided on the second discharge path 98 to control the flow of residual liquid in the filter 21 by opening and closing the second discharge path 98.

[0077] Figure 3 This is a view illustrating the configuration of a filtering device according to various embodiments of the present disclosure. Figure 4 This is a view showing the dispenser and user interface of a filtering device according to various embodiments of the present disclosure.

[0078] refer to Figure 3 and Figure 4 The filter device 1 may include a user interface 110, a distribution rod 120, a flow sensor 130, valve groups 140:141-148, a heater 150, a cooler 160, an optical sensor 200, and / or a processor 190.

[0079] The user interface 110 can be set on the upper surface of the dispenser 50.

[0080] like Figure 4 As shown, the dispenser 50 may include a dispenser body 51, which is configured to form the exterior and in which various components are arranged. The dispenser body 51 may be generally shaped like the letter "F". One side of the dispenser body 51 may be rotatably coupled to the kitchen countertop 2.

[0081] The dispenser body 51 may include a generally upwardly extending neck 52 and a generally horizontally extending head 53 from the upper end of the neck 52. The lower end of the neck 52 may be rotatably coupled to the kitchen countertop 2 via a rotating member 60.

[0082] The neck 52 can be formed separately and coupled to the head 53, or alternatively, the neck 52 can be formed integrally with the head 53. The neck 52 can be perpendicular and inclined relative to a surface of the kitchen countertop 2 on which the mounting member 3 is formed.

[0083] User interface 110 can be disposed on the upper surface of dispenser 50. Specifically, head 53 can open in an upward direction, and user interface 110 can be coupled to the upper surface of the opened head 53 to cover the internal space of head 53 in which various electronic components are arranged. However, the type and location of user interface 110 are not limited to the above examples, and there are no restrictions on the type and location of user interface as long as the type and location of user interface are set to receive the type of liquid and / or the set temperature of hot water from the user.

[0084] The user interface 110 can receive touch input and can output images. The user interface 110 may include an input button 111 and a display 119, the input button 111 being configured to receive user input and the display 119 being configured to display the discharge settings and / or operation information of the filter device 1 in response to user input.

[0085] Input button 111 may include multiple buttons configured to receive various user inputs.

[0086] For example, such as Figure 4 As shown, the input button 111 may further include: a hot water button 112, configured to receive user input for setting the discharge of hot water through the distributor 50; a cold water button 113, configured to receive user input for setting the discharge of cold water through the distributor 50; a filtered water button 114, configured to receive user input for setting the discharge of filtered water through the distributor 50; a setting button 115, configured to receive user input for setting the target amount of liquid discharged through the distributor 50; or a dispensing button 116, configured to receive user input for requesting the discharge of liquid (e.g., hot water, cold water, or room temperature liquid) through the distributor 50.

[0087] The input button 111 may include at least one of a tactile switch, a push switch, a slide switch, a toggle switch, a micro switch, and a touch switch.

[0088] Input button 111 may include multiple light sources to emit light beams upon activation of filter device 1. For example, input button 111 may include a first light source located below hot water button 112, a second light source located below cold water button 113, a third light source located below filtered water button 114, a fourth light source located below setting button 115, and / or a fifth light source located below dispensing button 116. The first, second, third, fourth, and / or fifth light sources may be turned off in response to standby mode of filter device 1 and turned on in response to activation of filter device 1. The first, second, third, fourth, and / or fifth light sources may include light-emitting diodes (LEDs).

[0089] Each of the multiple buttons can receive user input and can provide the processor 190 with an electrical signal (e.g., a voltage signal or a current signal) indicating the received user input. The processor 190 can identify the user input based on the output signals of the multiple buttons. For example, the processor 190 can identify the user input based on the output signals of the multiple buttons. For example, the processor 190 can control the valve assembly 140 to discharge hot water, cold water, or room temperature water based on user input via the hot water button 112, cold water button 113, or filtered water button 114. Furthermore, the processor 190 can set a target amount of liquid discharged through the dispenser 50 based on user input via the setting button 115. The target amount can be a predetermined amount, such as 120ml, 260ml, 500ml, 1000ml, etc., and can be set based on the number of times the setting button 115 is touched or pressed.

[0090] Display 119 can receive display signals from processor 190. Based on the display signals, display 119 can display setting information and / or operation information corresponding to user input of the filter device 1. For example, display 119 can display the liquid temperature (e.g., hot water, cold water, or filtered water) set via input button 111 and / or the liquid discharge rate set via setting button 115, which is set while the liquid is not being discharged. Furthermore, display 119 can display the amount of liquid discharged through dispenser 50 when liquid is being discharged.

[0091] The display 119 may include a liquid crystal display (LCD) panel and a light-emitting diode (LED) panel.

[0092] The dispensing lever 120 can be positioned on the upper surface of the dispenser 50 near the user interface 110.

[0093] The lever 120 can change its position or orientation by physical pressure from the user. The lever 120 may include a distribution switch 121 to turn on or off (close or open) depending on the position or orientation of the lever 120. For example, the distribution switch 121 can be turned off or open in response to a first position or first orientation of the lever 120. The distribution switch 121 can be turned on or closed in response to the lever 120 being moved to a second position or second orientation by physical pressure from the user.

[0094] Distributor switch 121 can receive user input requesting the discharge of liquid (e.g., hot water, cold water, or room temperature liquid) through dispenser 50. Distributor switch 121 may include a push-button switch, a micro switch, or a reed switch.

[0095] The distribution switch 121 can provide the processor 190 with an electrical signal representing the received user input. The processor 190 can identify the user input requesting the discharge of liquid based on the output signal of the distribution switch 121.

[0096] Flow sensor 130 can be disposed on filter path 92 and can identify the liquid flow rate passing through flow sensor 130. In other words, flow sensor 130 can identify the flow rate of liquid filtered by filter unit 20 and passing through filter path 92. In addition, flow sensor 130 can identify the speed at which liquid passes through flow sensor 130, such as the amount of liquid passing through flow sensor 130 per unit time.

[0097] The flow sensor 130 can provide an electrical signal to the processor 190 indicating the liquid flow rate or liquid velocity. The processor 190 can identify the amount of liquid passing through the flow sensor 130 or the amount of hot, cold, or room temperature liquid discharged through the distributor 50 based on the output signal of the flow sensor 130.

[0098] Valve assembly 140 may include the above-mentioned... Figure 2 The valves described herein. For example, valve assembly 140 may include a source valve 141, a first filter valve 142, a second filter valve 143, a disinfectant solution valve 144, a hot water valve 145 and a cold water valve 146, a first drain valve 147 and / or a second drain valve 148. Each of the multiple valves may be respectively arranged on a source path 91, a disinfectant solution path 94, a hot water path 95, a cold water path 96, a first drain path 97 or a second drain path 98.

[0099] Multiple valves may include electrically operated valves (e.g., solenoid valves) to open or close flow paths by means of a drive current (or drive voltage).

[0100] Each of the plurality of valves may include a valve actuator to supply drive current (apply drive voltage) to each of the plurality of valves included in the valve group in response to an open / close signal from the processor 190. For example, the valve actuator may supply drive current to a valve to open a valve that is normally closed, or supply drive current to a valve to close a valve that is normally open. The valve actuator may include a power switch (e.g., MOSFET, BJT, IGBT, etc.) and circuitry attached thereto, the power switch being used to supply or block drive current to each of the plurality of valves in response to an open / close signal from the processor 190.

[0101] The heater 150 can be installed on the hot water path 95 and can heat the liquid passing through the hot water path 95 (e.g., filtered water).

[0102] Heater 150 can generate heat via drive current or drive voltage. The heat emitted by heater 150 can be proportional to the square of the drive current supplied to heater 150. Heater 150 may include a heater driver to supply drive current (or apply drive voltage) to heater 150 in response to a heating signal from processor 190. The heater driver may include a power switch and associated circuitry for supplying or blocking drive current to heater 150 in response to a heating signal from processor 190.

[0103] Cooler 160 can be installed on cold water path 96 and can cool liquid (e.g., filtered water) passing through cold water path 96.

[0104] Cooler 160 may include a cooling circuit comprising a compressor, a condenser, an expander, and an evaporator. The compressor may include a motor, and the motor may be used to circulate refrigerant in the cooling circuit. Cooler 160 cools the liquid by the evaporation of the refrigerant circulating in the refrigerant circuit.

[0105] Cooler 160 may include a motor driver to supply drive current or apply drive voltage to the motor included in cooler 160 in response to a cooling signal from processor 190. The motor driver may include a power switch and attached circuitry for supplying or blocking drive current to or from the motor in cooler 160 in response to a cooling signal from processor 190. The motor driver may include inverter circuitry for supplying or blocking drive current to or from the motor.

[0106] The disinfectant solution generator 94a can be installed on the disinfectant solution path 94 and add disinfectant materials such as hypochlorous acid or hydroxyl radicals to the liquid passing through the disinfectant solution path 94.

[0107] The disinfectant solution generator 94a may include a positive electrode 94b and a negative electrode 94c for electrolyzing the liquid.

[0108] The disinfectant solution generator 94a may include an electrode driver to apply voltage to the positive electrode 94b and the negative electrode 94c in response to a disinfection signal from the processor 190. The electrode driver may apply or block voltage to the positive electrode 94b and the negative electrode 94c in response to the disinfection signal from the processor 190.

[0109] The optical sensor 200 can provide data for identifying organic and / or inorganic substances contained in the liquid filtered by the filter 21, or for identifying the concentration of organic substances or the amount of organic substances per unit volume and / or the concentration of inorganic substances or the amount of inorganic substances per unit volume contained in the liquid filtered by the filter 21.

[0110] The optical sensor 200 can be disposed on the flow path 90 downstream of the filter 21. The optical sensor 200 can be disposed between the first filter path 92 and the second filter path 93, or between the first filter valve 142 and the second filter valve 143. The optical sensor 200 can also be disposed between the second filter path 93 and the distributor 50, or between the second filter valve 143 and the distributor 50.

[0111] The optical sensor 200 may include a first light source 210, a second light source 220, a first optical sensor 230, and / or a second optical sensor 240. The first light source 210 and the second light source 220 may emit light beams of different wavelength ranges, and the first optical sensor 230 and the second optical sensor 240 may be arranged at different locations. For example, the second optical sensor 240 may be located in the path of the light beams emitted from the first light source 210 and the second light source 220, and the first optical sensor 230 may be located outside the path of the light beams emitted from the first light source 210 and the second light source 220.

[0112] Processor 190 can be electrically connected to user interface 110, dispensing lever 120, flow sensor 130, valves 141 to 148 of valve assembly 140, heater 150, cooler 160, disinfectant solution generator 94a, and / or optical sensor 200. Processor 190 can process output signals from user interface 110, dispensing lever 120, flow sensor 130, or optical sensor 200. In response to the output signals, processor 190 can provide control signals to valves 141-148, heater 150, cooler 160, or disinfectant solution generator 94a.

[0113] Processor 190 may include memory 191 to store or store programs (multiple instructions) or data for processing signals and providing control signals. Memory 191 may include volatile memory such as static random access memory (S-RAM) and dynamic random access memory (D-RAM), and non-volatile memory such as read-only memory (ROM) and erasable programmable read-only memory (EPROM). Memory 191 may be provided integrally with processor 190 or as a semiconductor device separate from processor 190.

[0114] The processor 190 may also include a processing core (e.g., arithmetic circuitry, memory circuitry, and control circuitry) to process signals based on programs or data stored in memory 191 and output control signals.

[0115] The filter device 1 may also include an external memory located outside the processor 190.

[0116] Processor 190 can process output signals from user interface 110 or lever 120 and recognize user input. Processor 190 can provide control signals to valves 141-148, heater 150, and / or cooler 160 in response to the recognized user input to discharge hot water, cold water, or room temperature liquid.

[0117] The processor 190 can clean or disinfect the flow path 90:91-98 of the filter device 1 based on the output of the optical sensor 200.

[0118] For example, processor 190 can identify the concentration of organic matter based on the output of optical sensor 200, and can also identify the concentrations of organic and inorganic matter based on the output of optical sensor 200. Processor 190 can clean the flow path 90 of filter device 1 based on the concentrations of organic and inorganic matter, and can also disinfect the flow path 90 of filter device 1 based on the concentration of organic matter.

[0119] The configuration of filter device 1 has been described above. However, Figure 3 The configuration of filter device 1 shown is merely an example. For example, Figure 3 Some of the components shown can be omitted or some components can be added.

[0120] For example, the filtration device 1 may also include a communication device for communicating with external devices. The communication device may include a wireless communication module for wireless communication with external devices or a wired communication module for communicating with external devices via a line.

[0121] The wireless communication module can wirelessly send and receive communication signals with an access point (AP) or base station. The AP or base station can be connected to a wide area network (WAN) (e.g., an intranet or the Internet). The wireless communication module can send communication signals to and receive communication signals from server equipment on the WAN via the AP or base station.

[0122] Wired communication modules can connect to a wide area network (WAN) (e.g., an intranet or the Internet) via a hub, router, switch, or gateway. Wired communication modules can also send and receive communication signals to and from server devices on the WAN.

[0123] Figure 5 This is a view showing the optical sensor of a filtering device according to various embodiments of the present disclosure. Figure 6 This is a view illustrating an operational example of the first light source of a filtering device according to various embodiments of the present disclosure. Figure 7 This is a view illustrating an operational example of the second light source of a filtering device according to various embodiments of the present disclosure. Figure 8 This is a view illustrating an example of a filtering device controlling an optical sensor according to various embodiments of the present disclosure.

[0124] like Figure 5 As shown, the optical sensor 200 may include a first light source 210, a second light source 220, a first optical sensor 230, and a second optical sensor 240.

[0125] The first light source 210 can emit a light beam in a predetermined wavelength band. For example, the first light source 210 can emit ultraviolet (UV) light or a light beam in the blue wavelength band. In other words, the light beam emitted from the first light source 210 can have a peak in the UV or blue wavelength band.

[0126] The second light source 220 can emit a light beam in a predetermined wavelength band. For example, the second light source 220 can emit a light beam with a visible light or infrared light band. In other words, the light beam emitted from the second light source 220 can have a peak in the visible light wavelength or infrared band.

[0127] The second light source 220 can emit a light beam with a different wavelength than that of the first light source 210. For example, while the first light source 210 emits a light beam in the UV band, the second light source 220 can emit a light beam in the visible or infrared band. As another example, while the first light source 210 emits a light beam in the blue band, the second light source 220 can emit a light beam in the red and / or infrared bands.

[0128] The second light source 220 can be arranged adjacent to or spaced apart from the first light source 210. For example, as Figure 5 As shown, the second light source 220 can be housed in the same housing as the first light source 210. However, the arrangement of the second light source 220 is not limited to... Figure 5 The arrangement shown is such that the second light source 220 can be housed in a housing different from that of the first light source 210.

[0129] The first optical sensor 230 can receive a light beam and output an electrical signal (e.g., a voltage signal or a current signal) corresponding to the intensity of the received light. For example, the first optical sensor 230 may include a photodiode to output a current whose amplitude depends on the intensity of the received light.

[0130] The first optical sensor 230 can receive light beams having wavelengths of light emitted from the first light source 210 and the second light source 220. For example, the first optical sensor 230 can receive light beams in the ultraviolet, visible, and infrared bands, and can output an electrical signal corresponding to the intensity of the received light.

[0131] In the same manner as the first optical sensor 230, the second optical sensor 240 can receive a light beam and output an electrical signal corresponding to the intensity of the received light. For example, the second optical sensor 240 may include a photodiode.

[0132] The second optical sensor 240 can also receive light beams having wavelengths of light emitted from the first light source 210 and the second light source 220.

[0133] The second optical sensor 240 can be arranged spaced apart from the first light source 210. For example, as Figure 5 As shown, the second optical sensor 240 can be housed in a housing different from that of the first optical sensor 230.

[0134] For example, the second optical sensor 240 can be arranged in the path of the light beams emitted from the first light source 210 and the second light source 220. In other words, the first light source 210 and the second light source 220 can emit light beams toward the second optical sensor 240, and the second optical sensor 240 can directly receive the light beams emitted from the first light source 210 and the second light source 220.

[0135] Furthermore, the first optical sensor 230 can be positioned outside the path of the light beams emitted from the first light source 210 and the second light source 220. In other words, the first optical sensor 230 may not directly receive the light beams emitted from the first light source 210 and the second light source 220. The first optical sensor 230 can receive light scattered or re-emitted by particles located in the path of the light beams.

[0136] The first optical sensor 230 and the second optical sensor 240 can be spaced apart from the first light source 210 and the second light source 220, respectively. In other words, sufficient space can be provided between the first light source 210 / second light source 220 and the first optical sensor 230 / second optical sensor 240 for the liquid filtered by the filter 21 to pass through.

[0137] Due to the deterioration or contamination of filter 21, the liquid passing through filter 21 may contain various foreign substances, such as organic matter (e.g., bacteria) and inorganic matter (e.g., dust).

[0138] The inorganic and organic substances contained in the liquid filtered by filter 21 can scatter light.

[0139] Inorganic and organic materials can scatter incident visible or infrared light. For example, light can diffusely reflect from the surfaces of inorganic and organic materials. Light scattered by inorganic and organic materials can travel in various directions.

[0140] For example, such as Figure 6 As shown, the second light source 220 can emit a visible light beam or an infrared light beam, and most of the visible light or infrared light emitted from the second light source 220 can pass through the inorganic material IG and then be incident on the second optical sensor 240. In this case, a portion of the visible light or infrared light emitted from the second light source 220 can be scattered by the inorganic material IG. Since a portion of the visible light or infrared light emitted from the second light source 220 is scattered, the intensity of the visible light or infrared light received by the second optical sensor 240 can be reduced. Furthermore, the first optical sensor 230 can receive a portion of the scattered visible light or infrared light and can provide the processor 190 with an electrical signal corresponding to the intensity of the received visible light or infrared light.

[0141] In this scenario, the intensity of the scattered visible or infrared light can depend on the concentration (or number of particles per unit volume) of organic and / or inorganic matter contained in the filtered liquid. Furthermore, as the concentration of organic and / or inorganic matter in the filtered liquid increases, the intensity of the visible or infrared light received by the first optical sensor 230 can increase, while the intensity of the visible or infrared light received by the second optical sensor 240 can decrease. In other words, the output (e.g., output voltage or output current) of the first optical sensor 230 can increase, while the output (e.g., output voltage or output current) of the second optical sensor 240 can decrease.

[0142] Organic and inorganic substances can scatter incident UV light. However, because UV light has a short wavelength, it can be scattered by relatively small particles. Therefore, the intensity of UV light scattered by the organic and inorganic substances included in the filtered liquid can be relatively low.

[0143] Organic materials can selectively absorb incident UV light and re-emit the absorbed UV light. In this case, the organic material can emit the absorbed UV light in all directions.

[0144] For example, such as Figure 7 As shown, the first light source 210 can emit a UV beam, and most of the UV beam emitted from the first light source 210 can pass through the organic material OG and then be incident on the second optical sensor 240. A portion of the UV light emitted from the first light source 210 can be absorbed by the organic material OG. The organic material OG that absorbs the UV light can emit UV light in all directions. The UV light emitted from the organic material OG can be incident on the first optical sensor 230. As described above, the first optical sensor 230 can receive a portion of the UV light emitted from the organic material OG and can provide the processor 190 with an electrical signal corresponding to the intensity of the received UV light.

[0145] In this case, the intensity of the absorbed / re-emitted UV light can depend on the concentration (or number of particles per unit volume) of organic matter included in the filtered liquid. Furthermore, as the concentration of organic matter included in the filtered liquid increases, the intensity of the UV light received by the first optical sensor 230 can increase, while the intensity of the UV light received by the second optical sensor 240 can decrease. In other words, the output (e.g., output voltage or output current) of the first optical sensor 230 can increase, while the output (e.g., output voltage or output current) of the second optical sensor 240 can decrease.

[0146] As mentioned above, the main reason why the emitted visible or infrared beam deviates from its path can be the scattering of light by organic and / or inorganic substances. Therefore, the filter device 1 can use visible or infrared light to identify the concentration of organic and / or inorganic substances.

[0147] On the other hand, the main reason why the emitted UV beam deviates from its path can be the absorption and re-emission of light by organic matter. Therefore, the filter device 1 can identify the concentration of organic matter by using UV light.

[0148] The processor 190 can alternately activate the first light source 210 and the second light source 220 to identify the concentration of organic matter and the concentration of organic / inorganic matter, respectively.

[0149] For example, such as Figure 8 As shown, processor 190 can activate the first light source 210 and deactivate the second light source 220 between time T0 and time T1 to identify the concentration of organic matter using UV light. Processor 190 can activate the second light source 220 and deactivate the first light source 210 between time T1 and time T2 to identify the concentration of organic and / or inorganic matter using visible or infrared light. Processor 190 can activate the first light source 210 and deactivate the second light source 220 between time T2 and time T3. Furthermore, processor 190 can activate the second light source 220 and deactivate the first light source 210 between time T3 and time T4.

[0150] Therefore, by alternately activating the first light source 210 and the second light source 220, the processor 190 can independently identify the concentration of organic matter and the concentration of organic and inorganic matter, without interference between UV light and visible light or between UV light and infrared light.

[0151] Figure 9 This is a view showing the configuration of the first optical sensor of a filtering device according to various embodiments of the present disclosure. Figure 10 It is shown Figure 9 A view of an example of the first optical sensor shown.

[0152] The configuration of the first optical sensor 230 will be described below. The configuration of the second optical sensor 240 is substantially the same as that of the first optical sensor 230, therefore the description of the configuration of the second optical sensor 240 is omitted.

[0153] like Figure 9 and Figure 10 As shown, the first optical sensor 230 may include a photodiode 231 and / or a light sensing circuit 232.

[0154] The photodiode 231 can receive light in the wavelength range emitted from the first light source 210 and the second light source 220. For example, the photodiode 231 can receive light in the UV, visible and infrared bands.

[0155] The photodiode 231 can output a current signal corresponding to the intensity of the received light.

[0156] The photosensitive circuit 232 can receive the current signal of the photodiode 231 and output a voltage signal corresponding to the current signal of the photodiode 231.

[0157] The photosensing circuit 232 may include a first sensing circuit 233 and a second sensing circuit 234. The first sensing circuit 233 can convert the current signal of the photodiode 231 into a first voltage signal without change and output the first voltage signal. The second sensing circuit 234 can accumulate the current signal of the photodiode 231 and output a second voltage signal corresponding to the accumulated current signal.

[0158] For example, such as Figure 10 As shown, the light sensing circuit 232 may include an amplifier 235, a first switch 236, a resistor 237, a second switch 238, and a capacitor 239.

[0159] The negative input terminal 235a of amplifier 235 can be connected to the cathode terminal 231a of photodiode 231. The positive input terminal 235b of amplifier 235 can be connected to ground, and the anode terminal 231b of photodiode 231 can be connected to ground.

[0160] The first switch 236 and resistor 237 can be connected in series between the output terminal 235c and the negative input terminal 235a of the amplifier 235. The first switch 236 and resistor 237 can correspond to the first sensing circuit 233.

[0161] The second switch 238 and capacitor 239 can be connected in series between the output terminal 235c and the negative input terminal 235a of amplifier 235. In other words, the second switch 238 and capacitor 239 can be connected in parallel with the first switch 236 and resistor 237. The second switch 238 and capacitor 239 can correspond to the second sensing circuit 234.

[0162] The first switch 236 and the second switch 238 can be switched on alternately.

[0163] In response to the first switch 236 being turned on and the second switch 238 being turned off, photodiode 231 receives light and can output a reverse first current I1. The first current I1 can pass through resistor 237 and flow to photodiode 231. Therefore, a voltage drop corresponding to the first current I1 can appear in resistor 237, and a voltage signal corresponding to the first current I1 can be output from the output terminal 235c of amplifier 235.

[0164] Furthermore, in response to the photodiode 231 receiving light while the first switch 236 is turned off and the second switch 238 is turned on, the photodiode 231 can output a reverse second current I2. This second current I1 can pass through the capacitor 239 and flow to the photodiode 231. Therefore, the charge corresponding to the second current I2 can accumulate in the capacitor 239, and the voltage signal corresponding to the accumulated charge in the capacitor 239 can be output from the output terminal 235c of the amplifier 235.

[0165] Therefore, in response to the output of a voltage signal corresponding to the charge of the second current I1 accumulated in the capacitor 239, the second sensing circuit 234 can accumulate the light received by the photodiode 231 and output an electrical signal corresponding to the intensity of the accumulated light. Thus, the sensitivity of the light sensing circuit 232 to light can be improved.

[0166] Figure 11 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure. Figure 12 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure. Figure 13 This is a view illustrating operational examples of the first light source and the first optical sensor of a filtering device according to various embodiments of the present disclosure.

[0167] The filter device 1 can accurately measure the intensity of light received by the photodiode 231 by sequentially using the first sensing circuit 233 and the second sensing circuit 234 of the first optical sensor 230.

[0168] Specifically, the processor 190 can use the first sensing circuit 233 of the first optical sensor 230 to identify the first intensity of light received by the photodiode 231.

[0169] Subsequently, the processor 190 can identify a detection duration for improving the sensitivity of measuring the light intensity based on the first intensity of the light. For example, the detection duration can decrease as the first intensity of the light increases, and the detection duration can increase as the first intensity of the light decreases.

[0170] Subsequently, the processor 190 can use the second sensing circuit 234 of the first optical sensor 230 to coarsely identify the intensity of the light with improved sensitivity. For example, by using the first sensing circuit 233, the processor 190 can identify the intensity of the light accumulated during the accumulation time.

[0171] When the first light source 210 is activated, the processor 190 can activate the first sensing circuit 233. The processor 190 can close (turn on) the first switch 236 to activate the first sensing circuit 233. The processor 190 can control the first light source 210 to emit light.

[0172] For example, such as Figure 11 As shown in a, the processor 190 can control the first light source 210 to emit light from time T10 to time T11.

[0173] The photodiode 231 of the first optical sensor 230 can receive light absorbed / re-emitted by organic matter (e.g., bacteria) included in the filtered liquid. The photodiode 231 receiving the light can output a reverse current, therefore, from time T10 to time T11, the first optical sensor 230 can output a first voltage signal V1, such as... Figure 11 As shown in b.

[0174] The processor 190 can identify the first detection duration T19 based on the first voltage signal V1.

[0175] The processor 190 can disconnect (turn off) the first switch 236 and close (turn on) the second switch 238 to activate the second sensing circuit 234.

[0176] Subsequently, the processor 190 can control the first light source 210 to emit UV light. For example, as Figure 11 As shown in Figure a, the processor 190 can control the first light source 210 to emit light from time T12 to time T13. In other words, the processor 190 can control the first light source 210 to emit light during the first detection duration T19.

[0177] A photodiode 231 that receives light absorbed / re-emitted by organic matter (e.g., bacteria) can output a reverse current. Therefore, charge can accumulate in capacitor 239, and the first optical sensor 230 can output an output signal that increases from time T12 to time T13, such as... Figure 11 As shown in b.

[0178] The processor 190 can sample the output of the first optical sensor 230 at time T13 after the first detection duration T19 expires, and identify the amount of light received by the photodiode 231 based on the first detection duration T19 and the sampled output.

[0179] Subsequently, the processor 190 can reset the charge of the capacitor 239 and re-identify the amount of light received by the photodiode 231 during the first detection duration T19.

[0180] As another example, such as Figure 12As shown in a, the processor 190 can control the first light source 210 to emit light from time T20 to time T21.

[0181] A photodiode 231 that receives light absorbed / re-emitted by organic matter (e.g., bacteria) can output a reverse current, thus the first optical sensor 230 can output a second voltage signal V2 from time T20 to time T21, as shown below. Figure 12 As shown in b. In this case, the second voltage signal V2 can be greater than Figure 11 The first voltage signal V1 is shown in the figure.

[0182] The processor 190 can identify the second detection duration T29 based on the second voltage signal V2. In this case, the second detection duration T29 can be less than... Figure 11 The first detection duration T19 is shown in the figure.

[0183] The processor 190 can disconnect (turn off) the first switch 236 and close (turn on) the second switch 238 to activate the second sensing circuit 234.

[0184] After that, as Figure 12 As shown in Figure a, the processor 190 can control the first light source 210 to emit light from time T22 to time T23. In other words, the processor 190 can control the first light source 210 to emit light during the second detection duration T29.

[0185] A photodiode 231 that receives light absorbed / re-emitted by organic matter (e.g., bacteria) can output a reverse current. Therefore, charge can accumulate in capacitor 239, and the first optical sensor 230 can output an output signal that increases from time T22 to time T23, such as... Figure 12 As shown in b.

[0186] The processor 190 can sample the output of the first optical sensor 230 at time T23 after the second detection duration T29 expires, and identify the amount of light received by the photodiode 231 based on the second detection duration T29 and the sampled output.

[0187] Subsequently, the processor 190 can reset the charge of the capacitor 239 and re-identify the amount of light received by the photodiode 231 during the second detection duration T29.

[0188] As another example, such as Figure 13 As shown in a, the processor 190 can control the first light source 210 to emit light from time T30 to time T31.

[0189] A photodiode 231 that receives light absorbed / re-emitted by organic matter (e.g., bacteria) can output a reverse current, thus the first optical sensor 230 can output a third voltage signal V3 from time T30 to time T31, as shown below. Figure 13 As shown in b. In this case, the third voltage signal V3 can be greater than Figure 12 The second voltage signal V2 is shown in the figure.

[0190] The processor 190 can identify the third detection duration T39 based on the third voltage signal V3. In this case, the third detection duration T39 can be less than... Figure 12 The second detection duration T29 is shown in the figure.

[0191] The processor 190 can disconnect (turn off) the first switch 236 and close (turn on) the second switch 238 to activate the second sensing circuit 234.

[0192] After that, as Figure 13 As shown in Figure a, the processor 190 can control the first light source 210 to emit light from time T32 to time T33. In other words, the processor 190 can control the first light source 210 to emit light during the third detection duration T39.

[0193] A photodiode 231 that receives light absorbed / re-emitted by organic matter (e.g., bacteria) can output a reverse current. Therefore, charge can accumulate in capacitor 239, and the first optical sensor 230 can output an output signal that increases from time T32 to time T33, such as... Figure 13 As shown in b.

[0194] The processor 190 can sample the output of the first optical sensor 230 at time T33 after the third detection duration T39 expires, and identify the amount of light received by the photodiode 231 based on the third detection duration T39 and the sampled output.

[0195] Subsequently, the processor 190 can reset the charge of the capacitor 239 and re-identify the amount of light received by the photodiode 231 during the third detection duration T39.

[0196] As described above, the filtering device 1 can identify the detection duration based on the instantaneous output of the first optical sensor 230, and identify the intensity of the light detected by the first optical sensor 230 based on the cumulative output of the first optical sensor 230 accumulated during the detection duration. Therefore, the filtering device 1 can improve the sensitivity of the first optical sensor 230 in measuring light intensity within an appropriate detection range.

[0197] The configuration and operation of the second optical sensor 240 are the same as those of the first optical sensor 230, and their description will be omitted.

[0198] When the first light source 210 is activated, the amplitude of the voltage signal output from the first optical sensor 230 can correspond to the intensity of the light detected by the first optical sensor 230, and also to the concentration of organic matter contained in the liquid flowing through the flow path on which the optical sensor 200 is mounted. For example, in response to an increase in the concentration of organic matter contained in the liquid, the amplitude of the voltage signal output from the first optical sensor 230 can increase.

[0199] When the second light source 220 is activated, the amplitude of the voltage signal output from the first optical sensor 230 can correspond to the intensity of the light detected by the first optical sensor 230, and also to the concentration of organic and inorganic substances contained in the liquid flowing through the flow path on which the optical sensor 200 is mounted. For example, in response to an increase in the concentration of organic and inorganic substances included in the liquid, the amplitude of the voltage signal output from the first optical sensor 230 can increase.

[0200] When the first light source 210 is activated, the amplitude of the voltage signal output from the second optical sensor 240 can correspond to the concentration of organic matter contained in the liquid flowing through the flow path on which the optical sensor 200 is mounted. For example, in response to an increase in the concentration of organic matter contained in the liquid, the amplitude of the voltage signal output from the second optical sensor 240 can decrease.

[0201] When the second light source 220 is activated, the amplitude of the voltage signal output from the second optical sensor 240 can correspond to the concentration of organic and inorganic substances contained in the liquid flowing through the flow path on which the optical sensor 200 is mounted. For example, in response to an increase in the concentration of organic and inorganic substances included in the liquid, the amplitude of the voltage signal output from the second optical sensor 240 can decrease.

[0202] The filtration device 1 can clean the flow path based on the concentration of organic and inorganic matter included in the liquid filtered by the filter 21 being equal to or greater than a reference concentration. For example, the filtration device 1 can clean the flow path based on the voltage signal output from the first optical sensor 230 being greater than or equal to a first reference value when the second light source 220 is activated. Furthermore, the filtration device 1 can clean the flow path based on the voltage signal output from the second optical sensor 240 being less than or equal to a second reference value when the second light source 220 is activated.

[0203] Depending on the amplitude of the voltage signal, the filter device 1 can adjust the cleaning time for cleaning the filter 21 and the flow path. For example, the cleaning time can increase in response to an increase in the amplitude of the voltage signal, and can decrease in response to a decrease in the amplitude of the voltage signal.

[0204] Figure 14 This is a view illustrating an example of a filtration device cleaning a flow path according to various embodiments of the present disclosure.

[0205] like Figure 14 As shown, the filter device 1 can clean the first filtration path 92, the second filtration path 93, the hot water path 95, and the cold water path 96 through which the filtered liquid flows.

[0206] The processor 190 can open the source valve 141, the first filter valve 142, and the first drain valve 147. Furthermore, the processor 190 can open at least one of the second filter valve 143, the hot water valve 145, and the cold water valve 146. All of the second filter valve 143, the hot water valve 145, and the cold water valve 146 can be opened, or they can be opened sequentially one by one.

[0207] In response to the opening of the valve, source liquid can pass through the first filtration path 92 and filter 21, thereby cleaning the first filtration path 92 and filter 21. Furthermore, in response to the opening of at least one of the second filtration valve 143, hot water valve 145, and cold water valve 146, at least one of the second filtration path 93, hot water path 95, and cold water path 96 can be cleaned. The cleaning liquid used to clean filter 21 and the flow path can be discharged to discharge port 99 through the first discharge path 97.

[0208] Furthermore, the filtration device 1 can disinfect the flow path based on the concentration of organic matter contained in the liquid filtered by the filter 21 being greater than or equal to a reference concentration. For example, the filtration device 1 can disinfect the flow path based on the amplitude of the voltage signal output from the first optical sensor 230 when the first light source 210 is activated being greater than or equal to a first reference value. Additionally, the filtration device 1 can disinfect the flow path based on the amplitude of the voltage signal output from the first optical sensor 230 when the first light source 210 is activated being less than or equal to a second reference value.

[0209] The disinfection time for cleaning the filter 21 and the flow path can be adjusted depending on the amplitude of the voltage signal. For example, the disinfection time can increase in response to an increase in the amplitude of the voltage signal, and can decrease in response to a decrease in the amplitude of the voltage signal.

[0210] Figure 15 This is a view illustrating an example of a filtration device disinfecting a flow path according to various embodiments of the present disclosure.

[0211] like Figure 15 As shown, the filtration device 1 can disinfect the first filtration path 92, the second filtration path 93, the hot water path 95, and the cold water path 96 through which the filtered liquid flows.

[0212] Processor 190 can open source valve 141, disinfectant solution valve 144, and first discharge valve 147. Processor 190 can operate disinfectant solution generator 94a to generate disinfectant solution. Furthermore, processor 190 can open at least one of second filter valve 143, hot water valve 145, and cold water valve 146. All of the second filter valve 143, hot water valve 145, and cold water valve 146 can be opened, or they can be opened sequentially one by one.

[0213] In response to the opening of the valve and the operation of the disinfectant solution generator 94a, the disinfectant substance can be mixed with the source liquid, and the disinfectant solution mixed with the disinfectant substance can disinfect at least one of the second filtration path 93, the hot water path 95, or the cold water path 96. The disinfectant solution used to disinfect the flow path can be discharged to the discharge port 99 through the first discharge path 97.

[0214] As described above, the filter device 1 can clean or disinfect the filter 21 and / or the flow path based on the output of the optical sensor 200.

[0215] Figure 16 This is a flowchart illustrating a method for cleaning / disinfecting a flow path using a filtration apparatus according to various embodiments of the present disclosure.

[0216] Reference Figure 16 A method 1000 is described for cleaning / disinfecting the flow path using a filter device 1.

[0217] The filter device 1 can activate the first light source 210 (1010).

[0218] The filtration device 1 may include an optical sensor 200 to identify the concentration of organic and / or inorganic matter contained in the liquid passing through the filter 21, either when the filtered liquid is discharged or when the filtered liquid is not discharged. The optical sensor 200 may include a first light source 210, a second light source 220, a first optical sensor 230, and a second optical sensor 240. Filtered water can pass between the first light source 210 and the second light source 220 and the first optical sensor 230 and the second optical sensor 240.

[0219] The first light source 210 can emit UV light, and the second light source 220 can emit visible or infrared light. The first optical sensor 230 can be located outside the path of the light emitted from the first light source 210 and the second light source 220, and the second optical sensor 240 can be located within the path of the light emitted from the first light source 210 and the second light source 220. Therefore, the first optical sensor 230 can receive scattered or absorbed / re-emitted light, and the second optical sensor 240 can receive light emitted from the first light source 210 and the second light source 220.

[0220] In order to identify the concentration of organic matter independently of the concentration of inorganic matter, the filter device 1 can activate the first light source 210 when the second light source 220 is deactivated. For example, the processor 190 can control the first light source 210 to emit UV light and control the second light source 220 not to emit visible or infrared light.

[0221] The filter device 1 can identify the outputs (1020) of the optical sensors 230 and 240 when the first light source 210 is activated.

[0222] The first light source 210, when activated, can emit UV light. When the first light source 210 is activated, the first optical sensor 230 and / or the second optical sensor 240 can directly or indirectly receive the light emitted from the first light source 210. The first optical sensor 230 and / or the second optical sensor 240 can output an electrical signal corresponding to the intensity of the received light.

[0223] The processor 190 can identify the output signal of the first optical sensor 230 and / or the output signal of the second optical sensor 240. The output signal of the first optical sensor 230 can correspond to the intensity of light absorbed / re-emitted by organic matter contained in the liquid, and the output signal of the second optical sensor 240 can correspond to the intensity of light passing through the organic matter.

[0224] The filter device 1 can deactivate the first light source (1030) in response to the expiration of a predetermined first time.

[0225] The processor 190 can deactivate the first light source 210 to alternately activate the second light source 220 and the first light source 210.

[0226] The filter device 1 identifies whether the output of the first optical sensor 230 is greater than or equal to the first reference output (1040).

[0227] For example, the processor 190 can compare the amplitude of the output signal of the first optical sensor 230, which is identified when the first light source 210 is activated, with a first reference output. The first reference output may correspond to the concentration of organic matter (bacteria) that makes the liquid suitable for drinking. The first reference output can be set experimentally or empirically.

[0228] However, this disclosure is not limited thereto, and the processor 190 can compare the amplitude of the output signal of the second optical sensor 240, identified when the first light source 210 is activated, with the third reference output. The processor 190 can determine whether the amplitude of the output signal of the second optical sensor 240 is less than or equal to the third reference output.

[0229] In response to the output of the first optical sensor 230 being greater than or equal to the first reference output (Yes in 1040), the filtration device 1 may perform a flow path disinfection operation based on the output of the first optical sensor 230 (1045).

[0230] For example, processor 190 can operate a disinfectant solution generator 94a disposed on the flow path to disinfect the flow path, and control a valve to allow liquid to pass through the disinfectant solution generator 94a and the flow path. The disinfectant substance generated by the disinfectant solution generator 94a can disinfect the flow path during the disinfection operation. Processor 190 can identify the duration of the disinfection operation based on the output of the first optical sensor 230. The duration of the disinfection operation can be increased in response to an increase in the output of the first optical sensor 230. Furthermore, the interval between performing the disinfection operation can be decreased in response to an increase in the output of the first optical sensor 230.

[0231] The processor 190 can activate the first light source 210 and receive the output of the first optical sensor 230 based on the completion of the disinfection operation along the flow path. In this case, based on the fact that the output of the first optical sensor 230 is still greater than or equal to the first reference output, the processor 190 can control the display 119 to display a message requesting filter 21 replacement. Furthermore, based on the fact that the output of the first optical sensor 230 is still greater than or equal to the first reference output, the processor 190 can send a communication signal to the user's terminal or home appliance to display the message requesting filter 21 replacement.

[0232] However, this disclosure is not limited thereto, and in response to the amplitude of the output signal of the second optical sensor 240 being less than or equal to the third reference output, the filtering device 1 can perform a disinfection operation on the flow path based on the output of the second optical sensor 240. Furthermore, based on the fact that the amplitude of the output of the second optical sensor 240 is still less than or equal to the third reference output after the disinfection operation on the flow path, the processor 190 can control the display 119 to display a message requesting filter 21 replacement. Additionally, based on the fact that the output of the second optical sensor 240 is still less than or equal to the third reference output, the processor 190 can send a communication signal to the user's terminal or home appliance to display a message requesting filter 21 replacement.

[0233] In response to the output of the first optical sensor 230 being less than the first reference output (No in 1040), the filter device 1 may activate the second light source 220 (1050). Furthermore, after the disinfection operation is completed, the filter device 1 may activate the second light source 220.

[0234] To identify the concentrations of organic and inorganic substances, the filter device 1 can activate the second light source 220 when the first light source 210 is deactivated. For example, the processor 190 can control the first light source 210 to not emit UV light and control the second light source 220 to emit visible or infrared light.

[0235] The filter device 1 can identify the outputs (1060) of the optical sensors 230 and 240 when the second light source 220 is activated.

[0236] The second light source 220, when activated, can emit visible light or infrared light. When the second light source 220 is activated, the first optical sensor 230 and / or the second optical sensor 240 can directly or indirectly receive the light emitted from the second light source 220. The first optical sensor 230 and / or the second optical sensor 240 can output an electrical signal corresponding to the intensity of the received light.

[0237] The processor 190 can identify the output signal of the first optical sensor 230 and / or the output signal of the second optical sensor 240. The output signal of the first optical sensor 230 can correspond to the intensity of light scattered by organic and inorganic substances contained in the liquid, and the output signal of the second optical sensor 240 can correspond to the intensity of light passing through organic and inorganic substances contained in the liquid.

[0238] The filter device 1 can deactivate the second light source 220 (1070) in response to the expiration of a predetermined second time.

[0239] The processor 190 can deactivate the second light source 220 to alternately activate the first light source 210 and the second light source 220.

[0240] The filter device 1 can identify whether the output of the first optical sensor 230 is greater than or equal to the second reference output (1080).

[0241] For example, processor 190 can compare the amplitude of the output signal of the first optical sensor 230, which is detected when the second light source 220 is activated, with a second reference output. The second reference output may correspond to the concentrations of organic and inorganic substances in the liquid that can be used for drinking. The second reference output can be set experimentally or empirically.

[0242] However, this disclosure is not limited thereto, and the processor 190 can compare the amplitude of the output signal of the second optical sensor 240, identified when the second light source 220 is activated, with the fourth reference output. The processor 190 can determine whether the amplitude of the output signal of the second optical sensor 240 is less than or equal to the fourth reference output.

[0243] In response to the output of the first optical sensor 230 being greater than or equal to the second reference output (Yes in 1080), the filter device 1 may perform a flow path cleaning operation based on the output of the first optical sensor 230 (1085).

[0244] For example, processor 190 can control a valve to allow liquid to pass through filter 21 and the flow path, thereby cleaning the flow path. During the cleaning operation, the liquid filtered by filter 21 cleans the flow path.

[0245] The processor 190 can identify the duration of the cleaning operation based on the output of the first optical sensor 230. The duration of the cleaning operation can be increased in response to an increase in the output of the first optical sensor 230. Alternatively, the interval between cleaning operations can be reduced in response to an increase in the output of the first optical sensor 230.

[0246] The processor 190 can activate the second light source 220 and receive the output of the first optical sensor 230 based on the completion of the cleaning operation along the flow path. In this case, based on the fact that the output of the first optical sensor 230 is still greater than or equal to the second reference output, the processor 190 can control the display 119 to display a message requesting filter 21 replacement. Furthermore, based on the fact that the output of the first optical sensor 230 is still greater than or equal to the second reference output, the processor 190 can send a communication signal to the user's terminal or home appliance to display the message requesting filter 21 replacement.

[0247] However, this disclosure is not limited thereto, and in response to the amplitude of the output signal of the second optical sensor 240 being less than or equal to the fourth reference output, the filtering device 1 can perform a cleaning operation on the flow path based on the output of the second optical sensor 240. Furthermore, based on the fact that the amplitude of the output of the second optical sensor 240 is still less than or equal to the fourth reference output after the cleaning operation on the flow path, the processor 190 can control the display 119 to display a message requesting filter 21 replacement. Additionally, based on the fact that the output of the second optical sensor 240 is still less than or equal to the fourth reference output, the processor 190 can send a communication signal to the user's terminal or home appliance to display a message requesting filter 21 replacement.

[0248] In response to the output of the first optical sensor 230 being less than the second reference output (No in 1080), the filter device 1 can activate the first light source 210 (1010). Furthermore, after the cleaning operation is completed, the filter device 1 can activate the first light source 210.

[0249] As described above, the filter device 1 can identify the concentration of organic matter independently of inorganic matter, and can accurately identify the degree of bacterial contamination of the flow path.

[0250] Therefore, the filter device 1 can perform disinfection operations on the contaminated flow path at appropriate times.

[0251] Figure 17 This is a flowchart illustrating a method for identifying the concentration of organic or inorganic matter in a flow path using a filtration apparatus according to various embodiments of the present disclosure.

[0252] Reference Figure 17 A method 1100 is described for identifying the concentration of organic or inorganic matter in a flow path using a filtration device 1.

[0253] The filter device 1 can activate the first sensing circuit 233 (1110) of the first optical sensor 230.

[0254] The first optical sensor 230 may include a photodiode 231, a first sensing circuit 233 for identifying the instantaneous intensity of light received by the photodiode 231, and a second sensing circuit 234 for identifying the cumulative intensity of light received by the photodiode 231.

[0255] The processor 190 can activate the first sensing circuit 233 to identify the instantaneous intensity of the light source 210 when it is activated, for sensing the concentration of organic matter. For example, the processor 190 can close (turn on) the first switch 236 to activate the first sensing circuit 233.

[0256] The filter device 1 can turn on the first light source 210 (1120) within a third time period.

[0257] When the first light source 210 is activated, the processor 190 can turn on the first light source 210 to emit UV light. When the first light source 210 is turned on, the processor 190 can identify the output signal of the first sensing circuit 233. The first sensing circuit 233 can output an electrical signal corresponding to the instantaneous intensity of the light received by the photodiode 231.

[0258] The processor 190 can turn off the first light source 210 after it is turned on, in response to the expiration of a third time period.

[0259] The filtering device 1 can set the detection duration (1130) according to the output of the first sensing circuit 233.

[0260] The detection duration indicates the duration for which the photodiode 231 receives light, in order to identify the cumulative intensity of the light received by the photodiode 231. In other words, the photodiode 231 can receive light during the detection duration, and the intensity of the light can accumulate during the detection duration.

[0261] The processor 190 can set the detection duration based on the amplitude of the output signal of the first sensing circuit 233. In other words, the detection duration can vary depending on the output of the first sensing circuit 233. For example, the detection duration can decrease in response to an increase in the amplitude of the output signal of the first sensing circuit 233, and the detection duration can increase in response to a decrease in the amplitude of the output signal of the first sensing circuit 233.

[0262] The filter device 1 can activate the second sensing circuit 234 (1140) of the first optical sensor 230.

[0263] The processor 190 can activate the second sensing circuit 234 to accumulate and measure the intensity of light received by the photodiode 231. For example, the processor 190 can close (turn on) the second switch 238 to activate the second sensing circuit 234.

[0264] Furthermore, the processor 190 can deactivate the first sensing circuit 233. For example, the processor 190 can disconnect (turn off) the first switch 236.

[0265] The filter device 1 can turn on the first light source 210 (1150) during the detection duration.

[0266] When the first light source 210 is activated, the processor 190 can turn on the first light source 210 to emit UV light. When the first light source 210 is turned on, the processor 190 can identify the output signal of the second sensing circuit 234. The second sensing circuit 234 can output an electrical signal corresponding to the cumulative intensity of the light received by the photodiode 231.

[0267] The processor 190 can turn off the first light source 210 after it has been turned on, in response to the expiration of the detection duration. The second sensing circuit 234 can output an electrical signal corresponding to the light intensity accumulated by the photodiode 231 during the detection duration.

[0268] The filter device 1 can identify the output (1160) of the second sensing circuit 234 of the first optical sensor 230.

[0269] The processor 190 can identify the output of the second sensing circuit 234, which corresponds to the concentration of organic matter included in the liquid flowing through the flow path.

[0270] For example, processor 190 can identify the concentration of organic matter included in the liquid flowing through the flow path based on the detection duration and the amplitude of the output signal of the second sensing circuit 234.

[0271] As described above, the filtering device 1 can identify the detection duration based on the instantaneous output of the first optical sensor 230, and identify the intensity of the light detected by the first optical sensor 230 based on the cumulative output of the first optical sensor 230 accumulated during the detection duration. Therefore, the filtering device 1 can improve the sensitivity of the first optical sensor 230 in measuring light intensity within an appropriate detection range.

[0272] Furthermore, the disclosed embodiments can be embodied in the form of a recording medium storing computer-executable instructions. The instructions can be stored as program code, and when executed by a processor, these instructions can generate a program module to perform the operations of the disclosed embodiments. The recording medium can be a computer-readable recording medium.

[0273] Computer-readable recording media include all types of recording media in which instructions that can be decoded by a computer are stored. For example, there may be read-only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, and optical data storage devices.

[0274] Machine-readable storage media can be provided in the form of non-transitory storage media. "Non-transitory" means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and the term includes both cases where data is stored semi-permanently in the storage medium and cases where data is temporarily stored in the storage medium. For example, a "non-transitory storage medium" can include a buffer for temporarily storing data.

[0275] Methods according to various disclosed embodiments can be provided by being included in a computer program product. The computer program product can be traded as a commodity between a seller and a buyer. The computer program product is distributed in the form of a device-readable storage medium (e.g., a compact disk read-only memory (CD-ROM)) or through an app store (e.g., the Play Store). TM The computer program product may be distributed directly or online between two user devices (e.g., smartphones) (e.g., downloaded or uploaded). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable application) may be temporarily stored or temporarily created in a device-readable storage medium such as the memory of a manufacturer's server, an app store's server, or a relay server.

[0276] Although some embodiments of the present disclosure have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the present disclosure as defined by the appended claims and their equivalents.

[0277] Although this disclosure has been described using various embodiments, various changes and modifications can be made by those skilled in the art. This disclosure is intended to include such changes and modifications that fall within the scope of the appended claims.

Claims

1. A filtration device, comprising: a flow path; a valve disposed on the flow path; a first light source configured to emit, toward the flow path, first light comprising ultraviolet (UV) light; a second light source configured to emit, toward the flow path, second light comprising visible or infrared light; a first optical sensor out of the path of the first light and the second light; an electrode disposed on the flow path; and a processor electrically coupled to the valve, the first light source, the second light source, the first optical sensor, and the electrode, and configured to: alternately operate the first light source to emit the first light and the second light source to emit the second light, receive, from the first optical sensor, a first signal while the first light source emits the first light, and control the valve and the electrode to disinfect the flow path based on the first signal, wherein the processor is further configured to: receive, from the first optical sensor, a second signal while controlling the second light source to emit the second light, and control the valve to clean the flow path based on the second signal. the first optical sensor comprises:

2. The filter device of claim 1, wherein, a photodiode; a first sensing circuit configured to identify, based on an output current of the photodiode, an instantaneous intensity of the first light or the second light; and a second sensing circuit configured to identify, based on the output current of the photodiode, a cumulative intensity of the first light or the second light. the processor is electrically coupled to the first sensing circuit and the second sensing circuit, and is further configured to alternately activate the first sensing circuit and the second sensing circuit.

3. The filter device of claim 2, wherein, the processor is further configured to:

4. The filter device of claim 3, wherein, identify, based on an output of the first sensing circuit, a detection duration, control the second sensing circuit to accumulate the output current of the photodiode during the detection duration, and control the valve and the electrode to disinfect the flow path based on an output of the second sensing circuit. the processor is further configured to decrease the detection duration based on an increase in a magnitude of the output of the first sensing circuit.

5. The filter device of claim 4, wherein, the first optical sensor comprises:

6. The filter device of claim 1, wherein, a photodiode; an amplifier coupled to a cathode terminal of the photodiode; a first switch and a resistor coupled in series between an output terminal and an input terminal of the amplifier; and a second switch and a capacitor coupled in series between the output terminal and the input terminal of the amplifier. the processor is further configured to control the valve and the electrode to disinfect the flow path based on a magnitude of the first signal being greater than or equal to a first reference value.

7. The filter device of claim 1, wherein, the processor is further configured to control the valve to clean the flow path based on a magnitude of the second signal being greater than or equal to a second reference value.

8. The filter device of claim 1, wherein, 9. The filtration device of claim 1, further comprising a second optical sensor in the path of the first light and the second light, the processor is further configured to: wherein receive, from the second optical sensor, a third signal while controlling the second light source to emit the second light, and ​ control the valve to clean the flow path based on the third signal.

10. The filter device of claim 9, wherein, the processor is further configured to control the valve to clean the flow path based on an amplitude of the third signal being less than or equal to a third reference value.

11. The filtration device of claim 1, further comprising a filter disposed on the flow path. wherein the first light source, the second light source, and the first optical sensor are disposed downstream of the filter.

12. A control method of a filtration device, the filtration device comprising a flow path, a valve disposed on the flow path, and an electrode disposed on the flow path, the control method comprising: alternately operating a first light source and a second light source, the first light source being configured to emit first light comprising ultraviolet (UV) light toward the flow path, the second light source being configured to emit second light comprising visible light or infrared light toward the flow path; identifying a first signal corresponding to an intensity of light received by a first optical sensor while the first light source emits the first light; and controlling the valve and the electrode to disinfect the flow path based on the first signal, wherein the control method further comprises: identifying a second signal corresponding to an intensity of light received by the first optical sensor while the second light source emits the second light, and controlling the valve to clean the flow path based on the second signal.

13. The control method according to claim 12, wherein operating the first light source includes alternately activating a first sensing circuit and a second sensing circuit, the first sensing circuit identifying an instantaneous intensity of the first light or the second light based on an output current of a photodiode, the second sensing circuit identifying a cumulative intensity of the first light or the second light based on the output current of the photodiode.

14. The control method according to claim 12, wherein operating the first light source includes controlling the valve and the electrode to disinfect the flow path based on an amplitude of the first signal being greater than or equal to a first reference value.

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