CN112649025A

CN112649025A - Dust amount detection method, device, circuit and household appliance

Info

Publication number: CN112649025A
Application number: CN201910957585.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2021-04-13

Abstract

The invention is suitable for the technical field of electronic circuits, and provides a dust amount detection method, a device, a circuit and a household appliance, wherein the method comprises the steps of collecting and calculating the dust amount at a dust suction port of a dust box according to the working state of an infrared pair transistor which is detected in real time, wherein the infrared pair transistor is arranged at the dust suction port of the dust box; integrating and accumulating the collected dust amount to obtain the total dust amount; judging whether the accumulated total dust amount reaches a target dust amount; if yes, sending out prompt information to prompt the user that the dust box is full of dust. According to the invention, the dust amount at the dust suction port of the dust box can be rapidly and accurately detected by using the working state detection of the infrared pair tubes, and the dust amount can be integrated, so that the total dust amount in the dust box can be detected, and the prompt to a user can be realized when the total dust amount in the dust box reaches the target dust amount, so as to prompt the user to clean the dust box, and the problem that the existing dust amount detection is not accurate is solved.

Description

Dust amount detection method, device, circuit and household appliance

Technical Field

The invention belongs to the technical field of electronic circuits, and particularly relates to a dust amount detection method, a dust amount detection device, a dust amount detection circuit and a household appliance.

Background

With the development of electronic technology and in order to reduce the labor of users, the existing household appliances such as washing machines, dishwashers, floor sweepers and the like are increasingly commonly used by users.

When the existing sweeper works, vacuum is formed in the main machine through high-speed rotation of the motor, and dust and garbage are sucked from the suction inlet by utilizing high-speed airflow generated by the vacuum. The dust box is limited in capacity, so that the dust box needs to be cleaned regularly. Therefore, the dust amount of the sweeper during working needs to be detected, so that the dust box can be cleaned more accurately.

The mode that current machine of sweeping the floor detected the dust volume has: whether the dust box is full of dust or not is judged according to the length of the working time, or multiple groups of infrared pair tubes are added in the dust box, and when the infrared receiving tubes in each group of infrared pair tubes do not acquire the infrared light emitted by the corresponding infrared emitting tube, it is determined that the dust box is full of all dust.

However, the existing sweeping robot has a large detection error under different working environments, for example, when the environment is poor and the amount of dust is large, the dust box of the sweeping robot can be filled in a short working time; or when the environment is better and the dust amount is less, the working time required by the preset dust full can be reached, but the dust box is not full, so that the dust amount cannot be effectively and accurately detected in a working time mode.

The existing mode of each group of infrared geminate transistors has high cost, and the problem that dust is completely attached to the infrared geminate transistors after working time is long or the dust in the dust box is not fully piled up but is misjudged due to shielding of the dust or large impurities exists, so that the corresponding dust amount in the dust amount detection process of the existing sweeper is not accurate enough, and whether the dust box can be measured accurately or not is caused.

Disclosure of Invention

The embodiment of the invention aims to provide a dust amount detection method, aiming at solving the problem that the existing dust amount detection is not accurate.

The embodiment of the invention is realized in such a way that a dust amount detection method comprises the following steps:

collecting and calculating the dust amount at a dust suction port of a dust box according to the detected working state of the infrared pair transistors in real time, wherein the infrared pair transistors are arranged at the dust suction port of the dust box;

integrating and accumulating the collected dust amount to obtain the total dust amount;

judging whether the accumulated total dust amount reaches a target dust amount;

if yes, sending out prompt information to prompt the user that the dust box is full of dust.

Further, the step of collecting and calculating the dust amount at the dust suction port of the dust box comprises:

recording a pulse signal when the light intensity received by an infrared receiving tube in the infrared pair tubes is obtained to be changed;

and calculating the dust amount at the dust suction port of the dust box according to the number of the received pulse signals in unit time.

Further, the step of integrating the collected dust amount includes:

judging whether the dust box is in a target state;

if yes, the collected dust amount is accumulated.

Further, the step of determining whether the dust box is in the target state further includes:

and when the dust box is judged not to be in the target state, sending request information to determine whether to clear the total dust amount according to response information of the request information responded by a user.

Still further, the method further comprises:

determining the target sweeping force of the current sweeping area according to the dust amount collected in real time;

and cleaning the current cleaning area according to the target cleaning strength.

Further, the step of calculating the amount of dust at the dust suction port of the dust box according to the number of the pulse signals received per unit time further includes:

and when the infrared pair transistors are in a working state and the change of the light intensity received by the infrared receiving tubes is not continuously acquired, an alarm signal is sent out to prompt a user that the dust amount detection function fails.

Another embodiment of the present invention further provides a dust amount detection apparatus, including:

the acquisition module is used for acquiring and calculating the dust amount at the dust suction port of the dust box according to the detected working state of the infrared pair transistors in real time, and the infrared pair transistors are arranged at the dust suction port of the dust box;

the calculation module is used for integrating and accumulating the collected dust amount to obtain the total dust amount;

the judging module is used for judging whether the accumulated total dust amount reaches the target dust amount or not;

and the prompting module is used for sending out prompting information to prompt a user that the dust box is full of dust when the judgment module judges that the accumulated total dust amount reaches the target dust amount.

Still further, the acquisition module comprises:

the recording unit is used for recording a pulse signal when the change of the light intensity received by the infrared receiving tube in the infrared pair tube is acquired;

and the first calculating unit is used for calculating the dust amount at the dust suction opening of the dust box according to the number of the received pulse signals in unit time.

Still further, the calculation module includes:

a judging unit for judging whether the dust box is in a target state;

and the second calculating unit is used for integrating and accumulating the collected dust amount when the judging unit judges that the dust box is in the target state.

Still further, the calculation module further comprises:

and the sending unit is used for sending request information when the judging unit judges that the dust box is not in the target state so as to determine whether to clear the total dust amount according to response information of the request information responded by a user.

Still further, the apparatus further comprises:

the determining module is used for determining the target sweeping force of the current sweeping area according to the dust and dust amount collected in real time;

and the cleaning module is used for cleaning the current cleaning area according to the target cleaning force.

Further, the acquisition module further comprises:

and the alarm unit is used for sending an alarm signal to prompt a user that the dust amount detection function fails when the infrared geminate transistor is in a working state and the light intensity received by the infrared receiving tube is not continuously obtained to be changed.

Another embodiment of the present invention further provides a dust amount detection circuit, including:

the infrared emission device comprises an infrared emission tube in infrared pair tubes and an infrared emission module for controlling the working state of the infrared emission tube;

the infrared receiving module comprises an infrared receiving tube in the infrared pair tubes and is used for detecting the working state of the infrared receiving tube;

the feedback module is connected between the infrared transmitting module and the infrared receiving module and controls the position between the infrared transmitting module and the infrared receiving module to be in a stable state again according to the voltage change feedback of the infrared receiving module;

the detection module is connected with the infrared receiving module and is used for detecting the voltage of the infrared receiving tube during working and amplifying and outputting the voltage;

the conversion module is connected with the detection module and is used for shaping and converting the output voltage of the detection module into a detection signal;

and the controller is connected with the conversion module and used for receiving the detection signal output by the conversion module, and the controller determines the dust amount of the current environment according to the detection signal.

Further, the infrared emission module includes:

the infrared emission tube;

the switch unit controls the working state of the infrared transmitting tube;

the current limiting unit is connected between the switch unit and the infrared emission tube and controls the magnitude of current output to the infrared emission tube according to the conduction of the switch unit;

and the first filtering unit is connected between the switch unit and the feedback module and used for filtering.

Further, the infrared receiving module includes:

the infrared receiving tube;

and the conversion unit is connected with the infrared receiving tube and converts the current signal flowing through the infrared receiving tube into a voltage signal.

Further, the feedback module comprises:

the integrating unit is connected between the infrared transmitting module and the infrared receiving module and feeds back the voltage change of the infrared receiving module to the infrared transmitting module;

and the first reference unit is connected with the integration unit and provides reference voltage of the integration unit.

Further, the detection module comprises:

the isolation unit is connected with the infrared receiving module and used for carrying out direct current isolation;

the voltage amplifying unit is connected with the isolation unit and the conversion module, amplifies the voltage input by the isolation unit and outputs the amplified voltage to the conversion module;

and the second reference unit is connected with the voltage amplification unit and provides reference voltage of the voltage amplification unit.

Further, the conversion module comprises:

the comparison unit is connected with the detection module and is used for comparing the voltage output by the detection module;

the third reference unit is connected with the input end of the comparison unit and provides reference voltage of the comparison unit;

and the second filtering unit is connected with the output end of the comparison unit and used for filtering.

Furthermore, the switch unit is a first triode, the current limiting unit is a first resistor, the first filtering unit comprises a second resistor and a first capacitor, a collector of the first triode is connected with a power supply, an emitter of the first triode is connected with one end of the first resistor, a base of the first triode is connected with the second resistor and one end of the first capacitor respectively, the other end of the first resistor is connected with one end of the infrared emission tube, the other end of the infrared emission tube is grounded, the other end of the second resistor is connected with the feedback module, and the other end of the first capacitor is grounded.

Furthermore, the conversion unit is a third resistor, one end of the third resistor is connected with one end of the infrared receiving tube and the detection module, the other end of the third resistor is grounded, and the other end of the infrared receiving tube is connected with a power supply.

Furthermore, the integrating unit comprises a first operational amplifier, a fourth resistor connected with the negative input end of the first operational amplifier, a second capacitor connected with the positive input end of the first operational amplifier, and a third capacitor connected with the negative input end and the output end of the first operational amplifier, the other end of the fourth resistor is connected with the infrared receiving module, the other end of the second capacitor is grounded, and the output end of the first operational amplifier is connected with the infrared emitting module;

the first reference unit comprises a first reference resistor and a second reference resistor which are sequentially connected, one end of the first reference resistor, which is connected with the second reference resistor, is connected with the positive input end of the first operational amplifier, the other end of the first reference resistor is connected with a power supply, and the other end of the second reference resistor is grounded.

Furthermore, the isolation unit is a fourth capacitor, one end of the fourth capacitor is connected with the infrared receiving module, and the other end of the fourth capacitor is connected with the voltage amplification unit;

the voltage amplifying unit comprises a second operational amplifier, a fifth capacitor connected with the positive input end of the second operational amplifier, and a fifth resistor connected between the negative input end and the output end of the second operational amplifier, wherein the positive input end of the second operational amplifier is connected with the fifth capacitor, the output end of the second operational amplifier is connected with the conversion module, and the other end of the fifth capacitor is grounded;

the second reference unit comprises a third reference resistor and a fourth reference resistor which are sequentially connected, one end of the third reference resistor, which is connected with the fourth reference resistor, is connected with the positive input end of the second operational amplifier, the other end of the third reference resistor is connected with a power supply, and the other end of the fourth reference resistor is grounded.

Furthermore, the comparison unit comprises a first comparator and a sixth resistor connected with the output end of the first comparator, the negative input end of the first comparator is connected with the detection module, the positive input end of the first comparator is connected with the third reference unit, the output end of the first comparator is connected with the second filtering unit, and the other end of the sixth resistor is connected with a power supply;

the third reference unit comprises a fifth reference resistor and a sixth reference resistor which are sequentially connected, one end of the fifth reference resistor, which is connected with the sixth reference resistor, is connected with the positive input end of the first comparator, the other end of the fifth reference resistor is connected with a power supply, and the other end of the sixth reference resistor is grounded;

the second filtering unit comprises a seventh resistor connected with the output end of the first comparator and a sixth capacitor connected with the other end of the seventh resistor, the other end of the sixth capacitor is grounded, and one end, connected with the sixth capacitor, of the seventh resistor is connected with the controller.

Another embodiment of the present invention further provides a household appliance, which includes the dust amount detection device.

According to the dust amount detection method provided by the embodiment of the invention, the dust amount at the dust suction port of the dust box can be quickly and accurately detected by using the working state of the infrared geminate transistors, and the detected dust amount is integrated, so that the total dust amount in the dust box can be detected, a prompt can be realized for a user when the total dust amount in the dust box reaches the target dust amount, the user is prompted to clean the dust box, the problem that the household appliance cannot be effectively cleaned due to the fact that the dust box is frequently cleaned because the user cannot accurately know the total dust amount in the dust box or the dust box is not cleaned because the total dust amount in the dust box reaches the total capacity of the dust box is solved, and the problem that the existing dust amount detection is not accurate is solved.

Drawings

Fig. 1 is a schematic flow chart of a dust amount detection method according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating a dust amount detecting method according to another embodiment of the present invention;

fig. 3 is a schematic block diagram of a dust amount detection apparatus according to an embodiment of the present invention;

fig. 4 is a schematic block diagram of a dust amount detection apparatus according to another embodiment of the present invention;

fig. 5 is a block diagram of a dust amount detection circuit according to an embodiment of the present invention;

fig. 6 is a block diagram of a dust amount detection circuit according to another embodiment of the present invention;

fig. 7 is a circuit diagram of a dust amount detection circuit according to another embodiment of the present invention;

fig. 8 is a circuit diagram of a dust amount detection circuit according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention can quickly and accurately detect the dust amount at the dust suction port of the dust box by detecting the working state of the infrared geminate transistors, integrates and accumulates the detected dust amount, so that the total dust amount in the dust box can be detected, a prompt to a user can be realized when the total dust amount in the dust box reaches the target dust amount, the user is prompted to clean the dust box, the problem that the cleaning of a household appliance cannot be effectively realized because the user cannot accurately know the total dust amount in the dust box and frequently cleans the dust box or because the total dust amount in the dust box reaches the total capacity of the dust box and the dust box is not cleaned is solved, and the problem that the existing dust amount detection is not accurate is solved.

Example one

Referring to fig. 1, a schematic flow chart of a dust amount detection method according to a first embodiment of the present invention is shown, in which the dust amount detection method specifically includes the following steps:

step S11, collecting and calculating the dust amount at the dust suction port of the dust box according to the detected working state of the infrared pair tubes in real time, wherein the infrared pair tubes are arranged at the dust suction port of the dust box;

in this embodiment, the household appliance is provided with a dust amount detection circuit for detecting the amount of dust in real time, and specifically, the infrared pair tube in the dust amount detection circuit is disposed at a dust suction port of a dust box in the household appliance, that is, dust enters the dust box through the dust suction port to store the dust.

Further, the household appliance collects and absorbs external dust through the negative pressure fan, the external dust flows through the dust collection port and then floats into the dust box, at the moment, due to the fact that the amount of the dust is different, the shielding of the infrared geminate transistors is different, and the dust amount detection circuit calculates the dust amount at the current dust collection port through the working state of the infrared geminate transistors in real time. Specifically, the infrared receiving tubes in the infrared pair tubes are shielded by different dusts, so that the received light intensities are different, at the moment, when the light intensity received by the infrared receiving tubes is changed, the dust and dust amount detection circuit determines to record a pulse signal, and at the moment, the dust and dust amount detection circuit correspondingly calculates the dust and dust amount at the dust suction opening of the dust box according to the recorded and acquired pulse amount in unit time.

Step S12, integrating and accumulating the collected dust amount to obtain the total dust amount;

in the embodiment of the present invention, after the dust amount detection circuit collects the dust amount in real time, the household appliance starts to perform integral and cumulative calculation on the collected dust amount to determine the dust amount stored in the dust box.

Step S13, judging whether the accumulated total dust amount reaches the target dust amount;

when it is determined that the accumulated total dust amount reaches the target dust amount, step S14 is executed;

in the embodiment of the invention, the household appliance compares the total dust amount obtained by integrating and accumulating with the target dust amount to judge whether the dust stored in the dust box of the current household appliance reaches the total capacity of the dust box, so as to avoid the problem that the household appliance cannot be effectively cleaned because the total dust amount in the dust box is greater than the total capacity of the dust box.

Step S14, sending out prompt information to prompt the user that the dust box is full of dust;

wherein, when judging that accumulative total dirt volume reaches target dirt volume, its domestic appliance sends tip information for the dust volume in the suggestion user's dust box has reached the total capacity of dust box, so that effectual dust to in the dust box is clear away, wherein send out the mode of suggestion and can be for carrying out the suggestion for acoustoelectric modes such as through light, stereo set, also can be for in sending this full information of dirt to equipment such as intelligent terminal, intelligent flat board that the user used through communication module, in order to realize the propelling movement suggestion.

In this embodiment, the mode through utilizing infrared geminate transistor operating condition detects the dust volume that makes the dust absorption mouth department that can be quick accurate detection go out the dust box, and carry out the integral accumulation with the dust volume that detects, make and to detect out the total dust volume in the dust box, make and to realize the suggestion to the user when detecting the total dust volume in the dust box and reach target dust volume, clear up the dust box with the suggestion user, and avoid because the user can't accurately know the total dust volume in the dust box and frequently carry out cleaning to the dust box or because the total dust volume in the dust box reaches the total capacity of dust box and does not clean the unable effectual realization of domestic appliance who leads to the dust box and clean the problem that leads to, the inaccurate problem of current dust volume detection has been solved.

Example two

Referring to fig. 2, a flow chart of a dust amount detection method according to a second embodiment of the present invention is shown, in which the dust amount detection method specifically includes the following steps:

step S21, collecting and calculating the dust amount at the dust suction port of the dust box according to the detected working state of the infrared pair tubes in real time, wherein the infrared pair tubes are arranged at the dust suction port of the dust box;

in an embodiment of the present invention, the collecting and calculating the dust amount at the dust suction port of the dust box according to the detected operating state of the infrared pair transistors in real time may be implemented by referring to the following steps:

(I): recording a pulse signal when the light intensity received by an infrared receiving tube in the infrared pair tubes is obtained to be changed;

(II): and calculating the dust amount at the dust suction port of the dust box according to the number of the received pulse signals in unit time.

Further, after the step (two), the method also comprises the following steps:

and when the fact that the infrared pair transistors are in a working state and the fact that the light intensity received by the infrared receiving tubes is not changed continuously is obtained, an alarm signal is sent out to prompt a user that a dust amount detection function is failed.

Wherein, it is pointed out that, because the dust and dust amount detection circuit realizes the detection of the dust and dust amount through the current generated by the light intensity received in the infrared receiving tube, at this time, the dust and dust amount is required to be changed to change the light intensity of the infrared light, so as to generate an effective pulse signal, at this time, when there is a paper sheet and other sundries sheltered between the infrared emitting tube and the infrared receiving tube of the infrared pair tube, the infrared receiving tube is in a state of not receiving the infrared light all the time, so the detection of the pulse signal can not be carried out at this time, therefore, at this time, the detection judges that the dust and dust amount is zero all the time (namely, the light intensity received by the infrared receiving tube is not obtained continuously) and when the household appliance is in a working state and the dust and dust amount collected all the time is zero, the dust and dust amount detection circuit sends out an alarm signal to prompt the user that the dust and dust amount, the problem of dust volume detection mistake caused by that the dust volume change is not obtained all the time due to the shielding of impurities in the dust volume detection circuit is solved.

Step S22, determining whether the dust box is in a target state;

when the dust box is judged to be in the target state, the step S23 is executed; otherwise, step S24 is executed.

It should be noted that the target state is a state in which the dust box is stably connected to the household appliance, that is, the household appliance can obtain whether the dust box is effectively installed in place.

Step S23, integrating and accumulating the collected dust amount to obtain the total dust amount;

when the dust box is judged to be in a target state, namely, installed in place, the user can be determined not to take out the dust box, and therefore, the collected dust amount is always subjected to integral accumulation processing at the moment so as to obtain the total dust amount.

Step S24, sending a request message to determine whether to clear the total dust amount according to the response message of the request message responded by the user.

When the dust box is judged not to be in the target state, namely not to be installed in place, the user is judged to possibly take out the dust box.

Therefore, when the household appliance is not in the working state, the request information is sent out so as to prompt the user that the installation state of the dust box is wrong and obtain the response information whether the user clears the total dust amount or not. When the dust box is cleaned for a user, the user can correspondingly install the dust box back to the original position after the cleaning is finished, and input response information for clearing the total dust amount, and at the moment, the household appliance carries out clearing calculation again on the total dust amount in the dust box; when the installation state is wrong due to the fact that the dust box is separated from the fixed position in the cleaning process, a user can fixedly install the dust box again and input response information which does not clear the total dust amount, and at the moment, the household appliance carries out continuous accumulative calculation on the total dust amount in the dust box.

When the household appliance is in the working state, a stop instruction is sent out to stop the household appliance, the request information is sent out to be further processed, and the problem of ineffective cleaning caused by the fact that the dust box is not installed in place is avoided.

Step S25, it is determined whether the accumulated total dust amount reaches the target dust amount.

Wherein, when the accumulated total dust amount is judged to reach the target dust amount, the step S26 is executed; otherwise, the loop executes step S23.

Step S26, sending a prompt to prompt the user that the dust bin is full of dust.

Step S27, determining the target sweeping force of the current sweeping area according to the dust and dust amount collected in real time;

wherein, owing to gather the operating condition of calculating the infrared geminate transistors through dust and dust volume detection circuitry and make the dust and dust volume of the dust absorption mouth department that can gather present dust box in real time, consequently, can confirm the current regional target of cleaning according to the dust and dust volume of acquireing this moment and clean the dynamics, for example, when gathering the dust and dust volume that cleans the region at present great, its corresponding definite current dynamics of cleaning is for big, wherein the mode of controlling the dynamics of cleaning can be for the suction size of the fan of control domestic equipment, also can be for the control to clean regional repeated number of times to cleaning at present.

And step S28, cleaning the current cleaning area according to the target cleaning force.

Wherein, after confirming the dynamics of cleaning, control domestic appliance cleans the region according to this dynamics of cleaning at present, for example, when collecting the dust volume that cleans the region at present great, clean or big suction repeatedly many times through control domestic appliance, and real-time dust volume adjustment according to gathering cleans the dynamics, make until when detecting that the dust volume that cleans the region at present is less than the default in the process of cleaning, then continue the regional cleaning of next cleaning, make and to realize that domestic appliance cleans regional clean to each.

It should be noted that, in other embodiments of the present invention, the steps S27-S28 may be performed before the steps S22-S26, and are not strictly performed in the order of the steps shown in the embodiments of the present invention.

EXAMPLE III

Fig. 3 is a schematic block diagram of a dust amount detection apparatus according to a third embodiment of the present invention, and only the relevant portions of the embodiment of the present invention are shown for convenience of description. In this embodiment, the dust amount detection device includes:

the acquisition module 110 is used for acquiring and calculating the dust amount at the dust suction port of the dust box according to the detected working state of the infrared pair transistors in real time, and the infrared pair transistors are arranged at the dust suction port of the dust box;

a calculating module 120, configured to integrate and accumulate the collected dust amount to obtain a total dust amount;

a judging module 130, configured to judge whether the accumulated total dust amount reaches a target dust amount;

a prompt module 140, configured to send a prompt message to prompt a user that the dust bin is full of dust when the determination module 130 determines that the accumulated total dust amount reaches the target dust amount.

The implementation principle and the generated technical effect of the dust amount detection device provided by the embodiment of the invention are the same as those of the method embodiment, and for brief description, the corresponding contents in the method embodiment can be referred to where the embodiment of the device is not mentioned.

Example four

Fig. 4 is a schematic block diagram of a dust amount detection apparatus according to a fourth embodiment of the present invention, and only the relevant portions of the embodiment of the present invention are shown for convenience of description. The implementation principle and the generated technical effects are the same as those of the third embodiment, and for the sake of brief description, no mention is made to the third embodiment of the present invention, and the corresponding contents in the third embodiment can be referred to.

The difference is that in one embodiment of the invention, the apparatus further comprises:

the determining module 150 is configured to determine a target sweeping force of a current sweeping area according to the dust amount collected in real time;

and the cleaning module 160 is used for cleaning the current cleaning area according to the target cleaning force.

Further, the acquisition module 110 includes:

the recording unit 111 is configured to record a pulse signal every time it is acquired that the light intensity received by an infrared receiving tube of the infrared pair tubes changes;

a first calculating unit 112, configured to calculate an amount of dust at the dust suction port of the dust box according to the number of received pulse signals per unit time.

Further, the acquisition module 110 further includes:

and the alarm unit 113 is configured to send an alarm signal to prompt a user that a dust amount detection function fails when the infrared pair tubes are in a working state and the light intensity received by the infrared receiving tubes is not continuously changed.

Further, the calculation module 120 includes:

a judging unit 121 for judging whether the dust box is in a target state;

a second calculating unit 122, configured to integrate and accumulate the collected dust amount when the determining unit 121 determines that the dust box is in the target state.

Further, the calculation module 120 further includes:

a determining unit 123, configured to send request information when the determining unit 121 determines that the dust box is not in the target state, so as to determine whether to clear the total dust amount according to response information of the request information responded by the user.

EXAMPLE five

Fig. 5 is a schematic block diagram of a dust amount detection circuit according to a fifth embodiment of the present invention, and only the relevant portions of the embodiment of the present invention are shown for convenience of description. The dust amount detection circuit is configured to implement the function of collecting and calculating the dust amount in the dust amount detection method according to any one of the first embodiment and the second embodiment.

Wherein, this dust amount of dust detection circuitry includes:

an infrared emission module 20 including an infrared emission tube among infrared pair tubes and controlling the working state of the infrared emission tube;

an infrared receiving module 30 including an infrared receiving tube among infrared pair tubes, for detecting the working state of the infrared receiving tube;

a feedback module 40 connected between the infrared transmitting module 20 and the infrared receiving module 30 and feedback-controlling the position between the infrared transmitting module 20 and the infrared receiving module 30 to be in a stable state again according to the voltage change of the infrared receiving module 30;

a detection module 50 connected with the infrared receiving module 30 for detecting the voltage of the infrared receiving tube during operation and amplifying and outputting;

a conversion module 60 connected to the detection module 50, for performing shaping and converting into a detection signal according to the output voltage of the detection module 50;

and a controller 70 connected to the conversion module 60 and receiving the detection signal output by the conversion module 60, wherein the controller 70 determines the dust amount of the current environment according to the detection signal.

In an embodiment of the present invention, the dust amount detection circuit is used for detecting the dust amount in the current environment, and mainly includes that the infrared receiving tubes can receive different intensities of infrared light emitted by the infrared emitting tube 21 under different dust amounts, so that currents flowing through the infrared receiving tubes are different, and therefore voltages of the infrared receiving modules 30 are different when the infrared receiving tubes operate, and after the voltage amount is detected and amplified by the detection module 50, the analog quantity signal is converted into a digital quantity signal by the conversion module 60, so that the controller 70 can receive the digital quantity signal and calculate and determine the dust amount in the current environment according to the digital quantity signal.

Further, the infrared transmitting module 20 is used for controlling the operating status of the infrared transmitting tube, and may be a switching type device connected to the infrared transmitting tube, and is used for controlling the amount of light emitted by the infrared transmitting tube by controlling the amount of current flowing through the infrared transmitting tube 21.

Further, the infrared receiving module 30 is configured to detect an operating state of the infrared receiving tube, and convert a current generated by the infrared receiving tube according to a received light emission amount into a voltage when the infrared receiving tube operates, specifically, when the infrared transmitting tube emits light, the infrared receiving tube correspondingly receives infrared light, wherein due to a difference in dust amount, a blocking amount of a light path from the infrared transmitting tube to the infrared receiving tube is different, so that the intensity of the infrared light received by the infrared receiving tube is different; the current flowing through the infrared receiving tube is different due to different received infrared light intensities, and the magnitude of the current is in direct proportion to the received infrared light intensities, namely, the larger the infrared light intensity received by the infrared receiving tube is, the larger the current flowing through the infrared receiving tube is. At this time, when the infrared receiving tube detects the operating state of the infrared receiving tube, the current signal of the infrared receiving tube 31 may also be converted into a voltage signal.

Further, the feedback module 40 is connected between the infrared transmitting tube and the infrared receiving tube, and is configured to control the light emitting amount of the infrared transmitting tube according to the difference of the receiving light intensity of the infrared receiving tube, so that the infrared transmitting module 20 and the infrared receiving module 30 are readjusted to the stable state when there is no shielding.

Further, the detecting module 50 is connected to the infrared receiving module 30, and is configured to detect a voltage magnitude of the infrared receiving tube 31 during operation, isolate a direct current, amplify the voltage magnitude, and output the amplified voltage magnitude to the converting module 60, at this time, the converting module 60 shapes and converts an analog voltage signal output by the detecting module 50 into a digital detecting signal, and sends the digital detecting signal to the controller 70, and the controller 70 determines an amount of dust according to the detecting signal.

When the infrared receiving module 30 works normally, the infrared emitting module 20 controls the infrared emitting tubes of the infrared pair tubes to work to emit infrared light, the infrared receiving tubes of the infrared pair tubes receive the infrared light emitted by the infrared emitting tubes, and correspondingly flow different currents according to the intensity of the currently received infrared light, and at the moment, the current signals flowing through the infrared receiving tubes are converted into voltage signals by the infrared receiving module 30; the detection module 50 detects the voltage signal, and amplifies and outputs the voltage signal after isolating the voltage signal from direct current to the conversion module 60, and the conversion module 60 further shapes and converts the amplified analog voltage signal into a digital detection signal to the controller 70, in specific implementation, the controller 70 may be a Micro Controller Unit (MCU), and the controller 70 may calculate and determine the amount of dust according to the digital signal. Further, the feedback module 40 performs feedback control according to the voltage change of the infrared receiving module 30, so that the infrared transmitting module 20 and the infrared receiving module 30 can be in a stable state again, and the feedback control is used for avoiding the problem that the received light intensity is small all the time due to dust attached to the infrared receiving tube.

In this embodiment, the infrared receiving tubes in the infrared pair tubes are used for detecting dust amount in the current environment, wherein the infrared transmitting tubes in the infrared pair tubes continuously emit light, so that the corresponding infrared receiving tubes can continuously receive infrared light emitted by the infrared transmitting tubes. In an ideal environment without dust, the ir receiving tube can receive and flow to the ir receiving module 30, the feedback module 40 and the detecting module 50, and the converting module 60 outputs a constant dc waveform signal to the controller 70. When dust is in the space between the infrared receiving tube and the infrared transmitting tube, the light intensity received by the infrared receiving tube 31 changes and becomes a state of decreasing, so that the current voltage of the infrared receiving tube 31 during operation becomes smaller, at this time, the detection module 50 amplifies the changed voltage signal and outputs the amplified voltage signal to the conversion module 60, the conversion module 60 outputs a pulse signal to the controller 70 after performing corresponding shaping conversion according to the voltage signal, at this time, the current flowing through the infrared receiving tube changes every time when dust changes, so that a pulse signal is finally output in the conversion module 60, at this time, the controller 70 can correspondingly determine the dust amount of the current environment according to the number of the pulse signals in the unit time, that is, the more the dust amount, the more the number of the pulse signals in the unit time.

In this embodiment, the infrared transmitting tube and the infrared receiving tube in the infrared pair tube are arranged to transmit and receive infrared light, the light intensity of the infrared light received by the infrared receiving tube is different, the current flowing through the infrared receiving tube is different, the voltage of the infrared receiving tube during operation can be detected by the arranged detection module, the voltage is amplified and output to the conversion module, the conversion module shapes and converts the input voltage into a detection signal, and the detection signal is output to the controller.

EXAMPLE six

Fig. 6 is a schematic structural diagram of a dust amount detection circuit according to a sixth embodiment of the present invention, which is substantially the same as the fifth embodiment, except that in this embodiment, the infrared emission module 20 includes:

an infrared emission tube 21;

a switch unit 22 for controlling the operating state of the infrared transmitting tube 21;

a current limiting unit 23 connected between the switch unit 22 and the infrared emission tube 21, and controlling the magnitude of the current output to the infrared emission tube 21 according to the conduction of the switch unit 22;

and a first filtering unit 24 connected between the switching unit 22 and the feedback module 40 for filtering.

Further, the infrared receiving module 30 includes:

an infrared receiving tube 31;

and a conversion unit 32 connected to the infrared receiving tube 31, for converting the current signal flowing through the infrared receiving tube 31 into a voltage signal.

Further, the feedback module 40 includes:

an integrating unit 41 connected between the infrared transmitting module 20 and the infrared receiving module 30 and feeding back to the infrared transmitting module 20 according to the voltage change of the infrared receiving module 30;

a first reference unit 42 connected to the integration unit 41 and providing a reference voltage of the integration unit 41.

Further, the detection module 50 includes:

an isolation unit 51 connected to the infrared receiving module 30 and performing dc isolation;

a voltage amplifying unit 52 connected to the isolating unit 51 and the converting module 60, for amplifying the voltage inputted from the isolating unit 51 and outputting the amplified voltage to the converting module 60;

and a second reference unit 53 connected to the voltage amplifying unit 52 for providing a reference voltage of the voltage amplifying unit 52.

Further, the conversion module 60 includes:

a comparison unit 61 connected to the detection module 50 for comparing the voltage output by the detection module 50;

a third reference unit 62 connected to an input terminal of the comparison unit 61 for providing a reference voltage of the comparison unit 61;

and a second filtering unit 63 connected with the output end of the comparing unit 61 for filtering.

Further, in an embodiment of the present invention, in a specific implementation, as shown in fig. 7, the switching unit 22 is a first triode Q1, the current limiting unit 23 is a first resistor R1, the first filtering unit 24 includes a second resistor R2 and a first capacitor C1, a collector C of the first triode Q1 is connected to the power supply VCC, an emitter e of the first triode Q1 is connected to one end of a first resistor R1, a base b of the first triode Q1 is connected to one end of the second resistor R2 and one end of the first capacitor C1, the other end of the first resistor R1 is connected to one end of the infrared emitter 21, the other end of the infrared emitter 21 is grounded, the other end of the second resistor R2 is connected to the feedback module 40, and the other end of the first capacitor C1 is grounded.

Further, in an embodiment of the present invention, the converting unit 32 is a third resistor R3, one end of the third resistor R3 is connected to one end of the infrared receiving tube 31 and the detecting module 50, the other end of the third resistor R3 is grounded, and the other end of the infrared receiving tube 31 is connected to the power supply VCC.

Further, in an embodiment of the present invention, the integrating unit 41 includes a first operational amplifier U1, a fourth resistor R4 connected to the negative input terminal of the first operational amplifier U1, a second capacitor C2 connected to the positive input terminal of the first operational amplifier U1, and a third capacitor C3 connected to the negative input terminal and the output terminal of the first operational amplifier U1, the other end of the fourth resistor R4 is connected to the infrared receiving module 30, the other end of the second capacitor C2 is grounded, and the output terminal of the first operational amplifier U1 is connected to the infrared emitting module 20;

the first reference unit 42 includes a first reference resistor R11 and a second reference resistor R12 connected in sequence, one end of the first reference resistor R11 connected to the second reference resistor R12 is connected to the positive input end of the first operational amplifier U1, the other end of the first reference resistor R11 is connected to the power supply VCC, and the other end of the second reference resistor R12 is grounded.

Further, in an embodiment of the present invention, the isolation unit 51 is a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the infrared receiving module 30, and the other end of the fourth capacitor C4 is connected to the voltage amplifying unit 52;

the voltage amplifying unit 52 comprises a second operational amplifier U2, a fifth capacitor C5 connected with the positive input end of the second operational amplifier U2, and a fifth resistor R5 connected between the negative input end and the output end of the second operational amplifier U2, the positive input end of the second operational amplifier U2 is connected with a fifth capacitor C5, the output end of the second operational amplifier U2 is connected with the conversion module 60, and the other end of the fifth capacitor C5 is grounded;

the second reference unit 53 includes a third reference resistor R13 and a fourth reference resistor R14 connected in sequence, one end of the third reference resistor R13 and the fourth reference resistor R14 connected is connected to the positive input end of the second operational amplifier U2, the other end of the third reference resistor R13 is connected to the power supply VCC, and the other end of the fourth reference resistor R14 is grounded.

Further, in an embodiment of the present invention, the comparing unit 61 includes a first comparator U3 and a sixth resistor R6 connected to an output terminal of the first comparator U3, a negative input terminal of the first comparator U3 is connected to the detecting module 50, a positive input terminal of the first comparator U3 is connected to the third reference unit 62, an output terminal of the first comparator U3 is connected to the second filtering unit 63, and the other end of the sixth resistor R6 is connected to the power supply VCC;

the third reference unit 62 comprises a fifth reference resistor R15 and a sixth reference resistor R16 which are connected in sequence, one end of the fifth reference resistor R15, which is connected with the sixth reference resistor R16, is connected with the positive input end of the first comparator U3, the other end of the fifth reference resistor R15 is connected with the power supply VCC, and the other end of the sixth reference resistor R16 is grounded;

the second filtering unit 63 includes a seventh resistor R7 connected to the output terminal of the first comparator U3, and a sixth capacitor C6 connected to the other terminal of the seventh resistor R7, wherein the other terminal of the sixth capacitor C6 is grounded, and one end of the seventh resistor R7 connected to the sixth capacitor C6 is connected to the controller 70.

Further, in an embodiment of the present invention, the dust amount detection circuit further includes a first protection module 80 connected to the infrared transmitting tube 21, a second protection module 90 connected to the infrared receiving tube 31;

the first protection module 80 comprises a first diode D1 and a second diode D2, wherein the anode of the first diode D1 and the cathode of the second diode D2 are connected with the infrared emission tube 21, the cathode of the first diode D1 is connected with the power supply VCC, and the anode of the second diode D2 is grounded;

the second protection module 90 includes a third diode D3 and a fourth diode D4, an anode of the third diode D3 and a cathode of the fourth diode D4 are connected to the infrared receiving tube 31, a cathode of the third diode D3 is connected to the power supply VCC, and an anode of the fourth diode D4 is grounded.

In an embodiment of the present invention, the power supply VCC is a 5V power supply, and it is understood that in other embodiments of the present invention, the power supply VCC may be other power supply, and is not limited herein. When the first triode Q1 is turned on, a voltage on the power supply VCC flows through the first resistor R1 and then flows out a small current to the infrared transmitting tube 21, so that the infrared transmitting tube 21 works and emits light, wherein the first protection module 80 is used for protecting the infrared transmitting tube 21 within a normal working voltage range. The second resistor R2 is used for dividing and filtering the voltage input by the feedback module 40, and the first capacitor C1 is used for filtering.

After the infrared emission tube 21 is operated to emit light, the infrared receiving tube 31 correspondingly receives the infrared light, and a current flows through the third resistor R3 according to the intensity of the received infrared light, and the third resistor R3 is used to convert the amount of the current flowing through into a voltage amount, so that a voltage amount is formed at a connection point of the infrared receiving tube 31 and the third resistor R3, and the larger the intensity of the light received by the infrared receiving tube 31 is, the larger the voltage at the connection point of the infrared receiving tube 31 and the third resistor R3 is. The second protection module 90 is used for protecting the infrared receiving tube 31 within a normal operating voltage range.

Further, in an embodiment of the present invention, the voltage at the connection point of the infrared receiving tube 31 and the third resistor R3 is output to the feedback module 40, that is, it is output to the first operational amplifier U1, when there is no dust, the feedback module 40 is in a stable state, that is, the infrared emitting tube 21 stably emits infrared light with certain brightness, the infrared receiving tube 31 stably receives infrared light with certain brightness, and the current flowing through the third resistor R3 is converted into a voltage and then is input to the feedback module 40, and at this time, the feedback module 40 does not acquire the change of the voltage, so no processing is performed. When dust exists, the intensity of the infrared light received by the infrared receiving tube 31 is low at this time, so that the current flowing through the infrared receiving tube 31 is reduced, and therefore the voltage input to the feedback module 40 is reduced, at this time, the voltage at the negative input end of the first operational amplifier U1 is reduced, and the magnitude of the first reference voltage provided by the first reference unit 42 at the positive input end of the first operational amplifier U1 is unchanged, so that at this time, the integrating unit 41 starts to operate, the voltage at the output end of the first operational amplifier U1 thereof is increased, so that the current of the first triode Q1 is increased, so that the current flowing through the infrared emitting tube 21 is increased, and therefore the brightness of the infrared emitting tube 21 is increased, so that the intensity of the infrared light received by the infrared receiving tube 31 is increased, and at this time, through the adjustment of the feedback module 40, a stable equilibrium state can be correspondingly entered, so that dust is prevented from being attached to, the intensity of light received by the infrared receiving tube 31 is reduced, and the subsequent erroneous judgment of the dust amount detection is performed. When the light intensity detected by the infrared receiving tube 31 changes, it always performs feedback through the feedback module 40 so that the infrared transmitting tube 21 and the infrared receiving tube 31 can be in a stable state again. The second capacitor C2 is used for filtering, the first reference resistor R11 and the second reference resistor R12 are used for providing a first reference voltage, and the first operational amplifier U1, the fourth resistor R4 and the third capacitor C3 form an integrating circuit.

Further, in an embodiment of the present invention, the voltage at the connection point of the infrared receiving tube 31 and the third resistor R3 is output to the detection module 50, that is, it is output to the fourth capacitor C4, wherein the fourth capacitor C4 is used for isolating direct current and transmitting the information of voltage variation, the input voltage is amplified by the second operational amplifier U2 based on the second reference voltage provided by the second reference unit 53 and then output through the output terminal, so that the amplified voltage output by the output terminal swings above and below the second reference voltage. When there is no change in the amount of dust, the voltage at the infrared receiving module 30 is a stable voltage, and the fourth capacitor C4 isolates the dc power, so that the voltage input to the negative input terminal of the second operational amplifier U2 is 0, and the amplified voltage output by the second operational amplifier U2 is the second reference voltage, where it is noted that the second reference voltage is greater than the third reference voltage provided by the third reference circuit, and the amplified voltage is compared with the third reference voltage by the first comparator U3 and then outputs a low level to the controller 70. When the amount of dust changes, the voltage output from the infrared receiving module 30 to the detecting module 50 decreases, and after passing through the fourth capacitor C4, the voltage input to the negative input terminal of the second operational amplifier U2 is a negative voltage, so that the amplified voltage amplified by the second operational amplifier U2 is smaller than the second reference voltage, where it should be noted that the amplified voltage is simultaneously smaller than the third reference voltage, so that the amplified voltage is compared with the third reference voltage by the first comparator U3 and then outputs a high level to the controller 70. Therefore, at this time, each time the amount of dust changes, the first comparator U3 outputs a high level signal, and the controller 70 can calculate the amount of dust in the current environment according to the pulse amount per unit time, i.e. the pulse amount is larger when the amount of dust is larger. The fourth capacitor C4 is used for passing ac, the fifth resistor R5 is an amplifying resistor for controlling an amplification factor, the fifth capacitor C5 is used for filtering, the third reference resistor R13 and the fourth reference resistor R14 are used for providing a second reference voltage, the fifth reference resistor R15 and the sixth reference resistor R16 are used for providing a third reference voltage, the sixth resistor R6 is a pull-up resistor matched with the first comparator U3, and the seventh resistor R7 and the sixth capacitor C6 are used for filtering.

EXAMPLE seven

Referring to fig. 8, a dust amount detection circuit according to a seventh embodiment of the present invention is substantially the same as the sixth embodiment in structure, and the difference therebetween is that the circuit further includes a second comparator U4, an eighth resistor R8, a ninth resistor R9, a seventh capacitor C7, a seventh reference resistor R17, and an eighth reference resistor R18.

The positive input end of the second comparator U4 is connected to the output end of the second operational amplifier U2 in the detection module 50, the negative input end of the second comparator U4 is connected to one end of the seventh reference resistor R17, which is connected to the eighth reference resistor R18, the output end of the second comparator U4 is connected to one end of the eighth resistor R8, which is connected to one end of the ninth resistor R9, the other end of the eighth resistor R8 is connected to the power supply VCC, the other end of the ninth resistor R9 is connected to the seventh capacitor C7 and the controller 70, the other end of the seventh capacitor C7 is grounded, the other end of the seventh reference resistor R17 is connected to the power supply VCC, and the other end of the eighth reference resistor R18 is grounded. The seventh reference resistor R17 and the eighth reference resistor R18 are used to provide a fourth reference voltage, the eighth resistor R8 is a pull-up resistor matched with the second comparator U4, and the ninth resistor R9 and the seventh capacitor C7 are used for filtering.

In an embodiment of the present invention, when the dust amount is in a stable state such that the current of the infrared receiving tube 31 is not changed, the fourth capacitor C4 thereof isolates the dc power, and when the dust amount is increased, as described with reference to the above embodiment, the first comparator U3 performs comparison and outputs a high level signal, and the amplified voltage is smaller than the fourth reference voltage provided by the negative input terminal of the second comparator U4, so that the second comparator U4 performs comparison and outputs a low level signal. When the amount of dust is reduced, the voltage output from the output terminal of the second operational amplifier U2 is increased, so that the first comparator U3 outputs a low level signal, and at this time, the amplified voltage thereof is greater than the fourth reference voltage, so that a high level signal is output after comparison by the second comparator U4.

Therefore, when the amount of dust increases, the first comparator U3 thereof outputs a pulse signal to the controller 70. When the dust amount is reduced from the steady state, the second comparator U4 outputs a pulse signal to the controller 70, and the controller 70 determines the dust amount in the current environment according to the pulse amounts output by the first comparator U3 and the second comparator U4 in unit time.

Example eight

An eighth embodiment of the present invention also provides a household appliance including the dust amount detection device described in the third or fourth embodiment. Wherein, this domestic appliance still includes the dust amount detection circuit of any one of the above-mentioned embodiments five to seven.

Wherein, this domestic appliance can be the dust catcher, sweeper etc, in this embodiment, this domestic appliance makes can real-time effectual detection dust dirt volume through setting up dust dirt volume detection circuitry, and accumulate through the dust dirt volume to real-time detection, obtain the total dust volume in the dust box present, when making the dust that can be in the dust box reach the total capacity of dust box, can correspondingly carry out the user and remind, avoid because the user can't accurately know the total dust volume in the dust box and frequently carry out cleaning process to the dust box or because the total dust volume in the dust box reaches the total capacity of dust box and the domestic appliance that leads to can't clean effectual realization to the dust box cleans the problem.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A dust amount detection method, characterized by comprising:

judging whether the accumulated total dust amount reaches a target dust amount;

2. The dust amount detecting method according to claim 1, wherein the step of collecting and calculating the amount of dust at the dust suction port of the dust box comprises:

3. The dust amount detection method according to claim 1, wherein the step of integrating the collected dust amount includes:

judging whether the dust box is in a target state;

if yes, the collected dust amount is accumulated.

4. The dust amount detection method according to claim 3, wherein the step of judging whether the dust box is in the target state further comprises:

5. The dust amount detection method according to claim 1, characterized by further comprising:

6. The dust amount detecting method according to claim 2, wherein the step of calculating the amount of dust at the dust suction port of the dust box based on the number of the pulse signals received per unit time further includes:

7. A dust amount detection device, characterized by comprising:

8. The dust amount detection device according to claim 7, wherein the collection module comprises:

9. The dust amount detection apparatus according to claim 7, wherein the calculation module includes:

a judging unit for judging whether the dust box is in a target state;

10. The dust amount detection apparatus according to claim 9, wherein the calculation module further comprises:

11. The dust amount detection device according to claim 7, further comprising:

12. The dust amount detection device according to claim 8, wherein the collection module further comprises:

13. A dust amount detection circuit, characterized by comprising:

14. The dust amount detection circuit according to claim 13, wherein the infrared emission module comprises:

the infrared emission tube;

the switch unit controls the working state of the infrared transmitting tube;

15. The dust amount detection circuit according to claim 13, wherein the infrared receiving module comprises:

the infrared receiving tube;

16. The dust amount detection circuit according to claim 13, wherein the feedback module comprises:

17. The dust amount detection circuit according to claim 13, wherein the detection module comprises:

18. The dust amount detection circuit according to claim 13, wherein the conversion module includes:

19. The dust amount detecting circuit according to claim 14, wherein the switching unit is a first transistor, the current limiting unit is a first resistor, the first filtering unit includes a second resistor and a first capacitor, a collector of the first transistor is connected to a power supply, an emitter of the first transistor is connected to one end of the first resistor, a base of the first transistor is connected to one end of the second resistor and one end of the first capacitor, respectively, the other end of the first resistor is connected to one end of the infrared emission tube, the other end of the infrared emission tube is grounded, the other end of the second resistor is connected to the feedback module, and the other end of the first capacitor is grounded.

20. The dust amount detecting circuit according to claim 15, wherein the converting unit is a third resistor, one end of the third resistor is connected to one end of the infrared receiving tube and the detecting module, the other end of the third resistor is grounded, and the other end of the infrared receiving tube is connected to a power supply.

21. The dust amount detection circuit according to claim 16, wherein the integration unit includes a first operational amplifier, a fourth resistor connected to a negative input terminal of the first operational amplifier, a second capacitor connected to a positive input terminal of the first operational amplifier, and a third capacitor connected to the negative input terminal and an output terminal of the first operational amplifier, the fourth resistor is connected at another end to the infrared reception module, the second capacitor is connected at another end to ground, and the output terminal of the first operational amplifier is connected to the infrared emission module;

22. The dust amount detection circuit according to claim 17, wherein the isolation unit is a fourth capacitor, one end of the fourth capacitor is connected to the infrared receiving module, and the other end of the fourth capacitor is connected to the voltage amplification unit;

23. The dust and dust amount detection circuit according to claim 18, wherein the comparison unit comprises a first comparator and a sixth resistor connected to an output terminal of the first comparator, a negative input terminal of the first comparator is connected to the detection module, a positive input terminal of the first comparator is connected to the third reference unit, an output terminal of the first comparator is connected to the second filter unit, and the other terminal of the sixth resistor is connected to a power supply;

24. A home appliance characterized by comprising the dust amount detection device according to any one of claims 7 to 12.