Particulate matter detection circuit and cleaning device comprising the same

Abstract

The application provides a particulate matter detection circuit and a cleaning device comprising the same. The particulate matter detection circuit comprises a signal transmitting circuit, a signal receiving circuit, a first sampling circuit, a second sampling circuit and a controller. The signal transmitting circuit is configured to transmit a signal to an environment to be detected. The signal receiving circuit is configured to receive a signal reflected by particulate matter in the environment to be detected. The first sampling circuit is configured to sample the signal output by the signal receiving circuit. The second sampling circuit is configured to amplify and sample the signal output by the signal receiving circuit. The controller comprises a first conversion circuit and a second conversion circuit. The first conversion circuit is configured to convert the signal of the first sampling circuit into a first digital signal. The second conversion circuit is configured to convert the signal of the second sampling circuit into a second digital signal. The controller is configured to determine the size of the particulate matter in the environment to be detected according to the first digital signal, and determine the number of the particulate matter in the environment to be detected according to the second digital signal.

Description

Technical Field

[0001] This application relates to the field of cleaning appliance technology, and more particularly to a particulate matter detection circuit and a cleaning device including the same. Background Technology

[0002] As living standards improve, people have higher and higher requirements for their home environment. To meet these growing needs, a variety of smart home appliances have emerged on the market. Cleaning devices, due to their ease of operation and use, are increasingly becoming part of people's lives, integrated into homes and offices, and have become an important and popular component of small appliances.

[0003] Currently, some cleaning devices have particulate matter detection capabilities, but they can usually only roughly detect the presence of particulate matter in the environment, and cannot perform more in-depth detection of particulate matter, providing limited information to users and failing to meet user needs. Utility Model Content

[0004] This application provides a particulate matter detection circuit and a cleaning device including the same, which can perform more comprehensive detection.

[0005] This application provides a particulate matter detection circuit, including:

[0006] A signal transmitting circuit, used to transmit signals to the environment under test;

[0007] A signal receiving circuit is used to receive signals reflected by particulate matter in the environment under test.

[0008] A first sampling circuit is connected to the signal receiving circuit and is used to sample the signal output by the signal receiving circuit.

[0009] The second sampling circuit is connected to the signal receiving circuit and is used to amplify and sample the signal output by the signal receiving circuit.

[0010] The controller includes a first conversion circuit and a second conversion circuit. The first conversion circuit is connected to the first sampling circuit and is used to convert the analog signal output by the first sampling circuit into a first digital signal. The second conversion circuit is connected to the second sampling circuit and is used to convert the analog signal output by the second sampling circuit into a second digital signal. The controller is used to: determine the size of the particulate matter in the environment under test based on the first digital signal, and determine the number of particulate matter in the environment under test based on the second digital signal.

[0011] In some embodiments, the particulate matter detection circuit includes: a signal transmitting circuit, a signal receiving circuit, a first sampling circuit, a second sampling circuit, and a controller; the signal transmitting circuit and the signal receiving circuit can transmit and receive signals reflected by particulate matter into the environment under test; the first sampling circuit and the second sampling circuit are respectively connected to the signal receiving circuit and perform different processing on the signals of the signal receiving circuit; the controller includes a first conversion circuit and a second conversion circuit, respectively connected to the first sampling circuit and the second sampling circuit, and converts the signals output by the first sampling circuit and the second sampling circuit into a first digital signal and a second digital signal; based on the first digital signal, the size of the particulate matter in the environment under test is determined, and based on the second digital signal, the number of particulate matter in the environment under test is determined. In this way, the particulate matter in the environment under test can be detected more comprehensively and with higher detection accuracy.

[0012] Optionally, the first sampling circuit includes a first sampling resistor connected to the signal receiving circuit and the first conversion circuit.

[0013] In some embodiments, the first sampling resistor can respond to changes in voltage or current in real time, with fast response speed, simple circuit, and low cost.

[0014] Optionally, the particulate matter detection circuit includes a power supply terminal and a ground terminal, and the second sampling circuit includes an operational amplifier. The operational amplifier includes a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the signal receiving circuit, the second input terminal is connected to the ground terminal, and the output terminal is connected to the second conversion circuit.

[0015] In some embodiments, an operational amplifier can amplify a signal, enhance signal stability, and facilitate subsequent signal processing.

[0016] Optionally, the second sampling circuit includes a second sampling resistor connected to the output terminal and the second conversion circuit.

[0017] In some embodiments, the second sampling resistor can respond to changes in voltage or current in real time, with fast response speed, simple circuit, and low cost.

[0018] Optionally, the second sampling circuit includes a capacitor connected to the first input terminal and the second input terminal.

[0019] In some embodiments, capacitors can filter the DC component in the signal input to the operational amplifier, thereby improving the purity of the signal.

[0020] Optionally, the particulate matter detection circuit further includes an emission control circuit connected to the controller and the signal emission circuit, wherein the controller controls the signal emission of the signal emission circuit by controlling the emission control circuit.

[0021] In some embodiments, a transmission control circuit is provided to conveniently control the operation of the signal transmission circuit and to conveniently control whether to detect particulate matter in the environment under test.

[0022] Optionally, the particulate matter detection circuit includes a power supply terminal and a ground terminal, the emission control circuit includes a controllable switch, the controllable switch includes a controllable terminal, a first terminal and a second terminal, the controllable terminal is connected to the controller, the first terminal is connected to the signal emission circuit, and the second terminal is connected to the ground terminal.

[0023] In some embodiments, the transmission control circuit includes a controllable switch, which can be conveniently controlled by controlling the controllable switch, resulting in a simple circuit.

[0024] Optionally, the transmission control circuit includes a drive resistor connected to the controller and the controllable terminal.

[0025] In some embodiments, the driving resistor can drive the controllable switch to work, ensuring that the controllable switch can work normally.

[0026] This application also provides a cleaning device, including a particulate matter detection circuit as described in any of the preceding claims.

[0027] Optionally, the cleaning device further includes a display screen electrically connected to the controller, the controller being configured to: control the display screen to display the size and / or quantity of the particles.

[0028] In some embodiments, the display screen may show information about particulate matter in the environment in which the cleaning device is located, so that the user can clearly know the information about particulate matter and make it convenient for the user to use the cleaning device.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 The diagram shown is a circuit diagram of one embodiment of the particulate matter detection circuit of this application.

[0032] Figure 2 As shown Figure 1 A circuit diagram of another embodiment of the particulate matter detection circuit shown. Detailed Implementation

[0033] This application provides a particulate matter detection circuit and a cleaning device including the same. The particulate matter detection circuit and the cleaning device including the same are described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0034] Figure 1 The diagram shown is a circuit diagram of one embodiment of the particulate matter detection circuit 10 of this application. Figure 1 As shown, the particulate matter detection circuit 10 includes: a signal transmitting circuit 11, a signal receiving circuit 12, a first sampling circuit 13, a second sampling circuit 14, and a controller 15.

[0035] The signal transmitting circuit 11 is used to transmit signals to the environment under test. The signal receiving circuit 12 is used to receive signals reflected by particulate matter in the environment under test.

[0036] The signal transmitting circuit 11 is connected to the controller 15, which can control the signal transmitting circuit 11 to transmit signals. In some embodiments, the signal transmitting circuit 11 includes an infrared emitting diode, and the signal receiving circuit 12 includes an infrared receiving diode. The infrared emitting diode can emit infrared light into the environment under test. Particles in the environment under test will reflect the infrared light, and the infrared receiving diode can receive the light reflected by the particles and convert it into an electrical signal. Different particles reflect different signals. The size, shape, material, quantity, density, etc. of the particles will affect the reflected signal. The signal transmitting circuit 11 can also transmit other types of signals, such as laser signals.

[0037] In some embodiments, the signal transmitting circuit 11 and the signal receiving circuit 12 are arranged facing the environment under test, which can better transmit signals to the environment under test and receive reflected signals. In some embodiments, the signal transmitting circuit 11 and the signal receiving circuit 12 are arranged opposite to each other, so that the signal receiving circuit 12 can better receive the signals emitted by the signal transmitting circuit 11 reflected by particulate matter.

[0038] The first sampling circuit 13 is connected to the signal receiving circuit 12 and is used to sample the signal output by the signal receiving circuit 12. The second sampling circuit 14 is connected to the signal receiving circuit 12 and is used to amplify and sample the signal output by the signal receiving circuit 12.

[0039] The first sampling circuit 13 directly samples the signal output by the signal receiving circuit 12. The first sampling circuit 13 can sample the current or voltage signal output by the signal receiving circuit 12. The current or voltage signal output by the signal receiving circuit 12 directly reflects the size of the particulate matter in the environment under test. The larger the particle size, the stronger the signal reflection capability, the greater the intensity of the reflected light, and the larger the voltage or current signal output by the signal receiving circuit 12. Conversely, the smaller the particle size, the weaker the signal reflection capability, the smaller the intensity of the reflected light, and the smaller the voltage or current signal output by the signal receiving circuit 12. Therefore, the signal output by the first sampling circuit 13 can reflect the size of the particulate matter.

[0040] The second sampling circuit 14 amplifies and samples the signal output from the signal receiving circuit 12. First, the second sampling circuit 14 amplifies the signal output from the signal receiving circuit 12, and then samples the amplified signal. After amplification, the signal output from the signal receiving circuit 12 is easier to sample for intensity changes. The second sampling circuit 14 samples the amplified voltage or current signal output from the signal receiving circuit 12. The number of particles affects the intensity change of the signal output from the signal receiving circuit 12. A higher number of particles results in a higher rate of intensity change in the signal output from the signal receiving circuit 12 because different particles have different reflectivity. Conversely, a lower number of particles results in a smaller rate of intensity change in the signal output from the signal receiving circuit 12. Therefore, the signal output from the second sampling circuit 14 can reflect the number of particles.

[0041] The controller 15 includes a first conversion circuit 151 and a second conversion circuit 152. The first conversion circuit 151 is connected to the first sampling circuit 13 and is used to convert the analog signal output by the first sampling circuit 13 into a first digital signal. The second conversion circuit 152 is connected to the second sampling circuit 14 and is used to convert the analog signal output by the second sampling circuit 14 into a second digital signal. The controller 15 is used to: determine the size of particulate matter in the environment under test based on the first digital signal, and determine the quantity of particulate matter in the environment under test based on the second digital signal.

[0042] The first conversion circuit 151 and the second conversion circuit 152 include analog-to-digital converters that can convert analog signals into digital signals. The first digital signal is obtained by converting the analog signal output from the first sampling circuit 13, and therefore reflects the size of the particulate matter. The second digital signal is obtained by converting the analog signal output from the second sampling circuit 14, and therefore reflects the quantity of particulate matter. The controller 15 can calculate the size of the particulate matter corresponding to the first digital signal based on the first digital signal, and calculate the quantity of particulate matter corresponding to the second digital signal based on the second digital signal. The controller 15 can also pre-store a lookup table of the first digital signal and the particulate matter size, and a lookup table of the second digital signal and the particulate matter quantity. The controller 15 looks up the lookup table based on the first and second digital signals to obtain the corresponding particulate matter size and quantity. This achieves the detection of the size and quantity of particulate matter in the test environment. Through the above scheme, not only the size of particulate matter can be detected, but also the quantity of particulate matter can be detected, allowing for more comprehensive detection of particulate matter in the test environment with higher detection accuracy.

[0043] Figure 2 As shown Figure 1 A circuit diagram of another embodiment of the particulate matter detection circuit 10 shown.

[0044] The first sampling circuit 13 includes a first sampling resistor R1, which is connected to the signal receiving circuit 12 and the first conversion circuit 151.

[0045] The controller 15 includes a T1 port, and the first sampling circuit 13 is connected to the T1 port, thereby connecting to the first conversion circuit 151. The electrical signal of the signal receiving circuit 12 affects the electrical signal of the first sampling resistor R1. When the voltage or current output by the signal receiving circuit 12 changes, the voltage or current signal of the first sampling resistor R1 changes accordingly. The controller 15 acquires the electrical signal of the first sampling resistor R1 through the T1 port, and the first conversion circuit 151 converts the electrical signal of the first sampling resistor R1 into a first digital signal. Based on the first digital signal, particulate matter can be detected.

[0046] In some embodiments, the first sampling resistor R1 can react to changes in voltage or current in real time, with fast response speed, simple circuit, and low cost.

[0047] The particulate matter detection circuit 10 includes a power supply terminal VCC and a ground terminal GND. The second sampling circuit 14 includes an operational amplifier 141, which includes a first input terminal I1, a second input terminal I2, and an output terminal O1. The first input terminal I1 is connected to the signal receiving circuit 12, the second input terminal I2 is connected to the ground terminal GND, and the output terminal O1 is connected to the second conversion circuit 152.

[0048] Operational amplifier 141 amplifies the signal output from signal receiving circuit 12. The first input terminal I1 is a non-inverting input, and the second input terminal I2 is an inverting input. The second input terminal I2 is connected to the output terminal O1 via resistor R2, forming a negative feedback network. Operational amplifier 141 has open-loop gain. Since the second input terminal I2 is connected to ground GND, the signal output from output terminal O1 is the signal input to the first input terminal I1 multiplied by the open-loop gain.

[0049] The controller 15 includes a T2 port. The output terminal O1 of the operational amplifier 141 is connected to the second conversion circuit 152 through the T2 port, and the signal is sent to the second conversion circuit 152.

[0050] In some embodiments, the operational amplifier 141 can amplify the signal, enhance signal stability, and facilitate subsequent signal processing.

[0051] The second sampling circuit 14 includes a second sampling resistor R3, which is connected to the output terminal O1 and the second conversion circuit 152.

[0052] One end of the second sampling resistor R3 is connected to the output terminal O1, and the other end is connected to the T2 port, which in turn connects to the second conversion circuit 152. The second sampling resistor R3 is used to sample the signal amplified by the operational amplifier 141. The signal output by the operational amplifier 141 will cause a change in the voltage or current signal of the second sampling resistor R3. The controller 15 can determine the output signal of the operational amplifier 141 based on the voltage or current signal of the second sampling resistor R3.

[0053] In some embodiments, the second sampling resistor R3 can respond to changes in voltage or current in real time, with fast response speed, simple circuit, and low cost.

[0054] The second sampling circuit 14 includes a capacitor C1 connected to the first input terminal I1 and the second input terminal I2. The capacitor C1 serves to pass alternating current while blocking direct current. Connected between the first input terminal I1 and the second input terminal I2, the capacitor C1 isolates the DC component of the signal input to the first input terminal I1, thus isolating the DC component of the signal output from the signal receiving circuit 12. This improves signal purity and facilitates amplification of the signal by the operational amplifier 141 and subsequent signal processing.

[0055] The particulate matter detection circuit 10 also includes a transmission control circuit 16, which is connected to the controller 15 and the signal transmission circuit 11. The controller 15 controls the signal transmission of the signal transmission circuit 11 by controlling the transmission control circuit 16.

[0056] Controller 15 includes a T3 port. Transmit control circuit 16 is connected to controller 15 via T3 port. Controller 15 transmits control signals to transmit control circuit 16 via T3 port. Controller 15 can control the on / off state of transmit control circuit 16, thereby controlling the signal transmission of signal transmission circuit 11. Controller 15 can output a PWM signal to transmit control circuit 16, and by adjusting the duty cycle of the PWM signal, adjust the on-time of transmit control circuit 16, thereby controlling the operating time of signal transmission circuit 11.

[0057] In some embodiments, a transmission control circuit 16 is provided to conveniently control the operation of the signal transmission circuit 11 and to conveniently control whether to detect particulate matter in the environment to be tested.

[0058] The transmission control circuit 16 includes a controllable switch Q1, which includes a controllable terminal G, a first terminal X1, and a second terminal X2. The controllable terminal G is connected to the controller 15, the first terminal X1 is connected to the signal transmission circuit 11, and the second terminal X2 is connected to the ground terminal GND.

[0059] The controllable terminal G is connected to port T3 of controller 15. Controller 15 sends control signals to the controllable terminal G through port T3 to control the on / off state of controllable switch Q1, thereby controlling the on / off state of transmission control circuit 16. Figure 2 In the illustrated embodiment, the controllable switch Q1 is an NPN transistor. When the controller 15 sends a high-level signal to the controllable terminal G, the controllable switch Q1 is turned on, connecting the controller 15 to the signal transmitting circuit 11, allowing the controller 15 to control the signal transmitting circuit 11 to transmit signals. When the controller 15 sends a low-level signal to the controllable terminal G, the controllable switch Q1 is turned off, disconnecting the controller 15 from the signal transmitting circuit 11, and the signal transmitting circuit 11 does not transmit signals. In other embodiments, the controllable switch Q1 can be other types of controllable switches.

[0060] In some embodiments, the transmission control circuit 16 includes a controllable switch Q1. By controlling the controllable switch Q1, the transmission control circuit 16 can be easily controlled, and the circuit is simple.

[0061] The transmission control circuit 16 includes a drive resistor R4, which is connected to the controller 15 and the controllable terminal G.

[0062] The driving resistor R4 is connected between the T3 port and the controllable terminal G. The driving resistor R4 can drive the controllable switch Q1. The driving resistor R4 can limit the current flowing into the controllable terminal G, preventing the controllable switch Q1 from being damaged due to overcurrent.

[0063] In some embodiments, the driving resistor R4 can drive the controllable switch Q1 to work, ensuring that the controllable switch Q1 can work normally.

[0064] This application also provides a cleaning device, including the particulate matter detection circuit 10 as described above. The cleaning device includes devices such as vacuum cleaners and mite removers. Using the particulate matter detection circuit 10, the cleaning device can detect the size and quantity of particulate matter, enabling it to use this information to clean the particulate matter, improving cleaning performance and meeting the user's deep cleaning needs.

[0065] In some embodiments, the cleaning device further includes a display screen electrically connected to a controller 15, the controller 15 being configured to: control the display screen to show the size and / or quantity of particles.

[0066] The display screen can be mounted on the casing of the cleaning device and face the user for easy viewing. The controller 15 can send information such as particle size and / or particle quantity to the display screen and control the display screen to show this information. The display screen can display this information in a reasonable manner. For example, if the particle size or quantity exceeds the normal range, this information is highlighted to make it easier for the user to notice these abnormalities and perform targeted cleaning. The information displayed on the screen changes as the environment in which the cleaning device is located.

[0067] The display screen can show information about particulate matter in the environment where the cleaning device is located, so that users can clearly know the information about particulate matter and make it easier for them to use the cleaning device.

Claims

1. A particulate matter detection circuit, characterized by, include: A signal transmitting circuit, used to transmit signals to the environment under test; A signal receiving circuit is used to receive signals reflected by particulate matter in the environment under test. A first sampling circuit is connected to the signal receiving circuit and is used to sample the signal output by the signal receiving circuit. The second sampling circuit is connected to the signal receiving circuit and is used to amplify and sample the signal output by the signal receiving circuit. The controller includes a first conversion circuit and a second conversion circuit. The first conversion circuit is connected to the first sampling circuit and is used to convert the analog signal output by the first sampling circuit into a first digital signal. The second conversion circuit is connected to the second sampling circuit and is used to convert the analog signal output by the second sampling circuit into a second digital signal. The controller is used to: determine the size of the particulate matter in the environment under test based on the first digital signal, and determine the number of particulate matter in the environment under test based on the second digital signal.

2. The particulate matter detection circuit of claim 1, wherein, The first sampling circuit includes a first sampling resistor, which is connected to the signal receiving circuit and the first conversion circuit.

3. The particulate matter detection circuit according to claim 1, characterized in that, The particulate matter detection circuit includes a power supply terminal and a ground terminal. The second sampling circuit includes an operational amplifier, which includes a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the signal receiving circuit, the second input terminal is connected to the ground terminal, and the output terminal is connected to the second conversion circuit.

4. The particulate matter detection circuit according to claim 3, characterized in that, The second sampling circuit includes a second sampling resistor, which is connected to the output terminal and the second conversion circuit.

5. The particulate matter detection circuit according to claim 3, characterized in that, The second sampling circuit includes a capacitor connected to the first input terminal and the second input terminal.

6. The particulate matter detection circuit according to claim 1, characterized in that, The particulate matter detection circuit also includes a transmission control circuit, which is connected to the controller and the signal transmission circuit. The controller controls the signal transmission of the signal transmission circuit by controlling the transmission control circuit.

7. The particulate matter detection circuit according to claim 6, characterized in that, The particulate matter detection circuit includes a power supply terminal and a ground terminal. The emission control circuit includes a controllable switch, which includes a controllable terminal, a first terminal, and a second terminal. The controllable terminal is connected to the controller, the first terminal is connected to the signal emission circuit, and the second terminal is connected to the ground terminal.

8. The particulate matter detection circuit according to claim 7, characterized in that, The transmission control circuit includes a drive resistor connected to the controller and the controllable terminal.

9. A cleaning device, characterized in that, Includes the particulate matter detection circuit as described in any one of claims 1-8.

10. The cleaning device according to claim 9, characterized in that, The cleaning device also includes a display screen electrically connected to the controller, the controller being used to control the display screen to display the size and / or quantity of the particles.

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