CN111443018A - Infrared detection circuit, light-emitting control method and device thereof, and household appliance - Google Patents

Infrared detection circuit, light-emitting control method and device thereof, and household appliance Download PDF

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Publication number
CN111443018A
CN111443018A CN202010386715.0A CN202010386715A CN111443018A CN 111443018 A CN111443018 A CN 111443018A CN 202010386715 A CN202010386715 A CN 202010386715A CN 111443018 A CN111443018 A CN 111443018A
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infrared
light
intensity
light intensity
interference
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Chinese (zh)
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闫旺
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0295—Constructional arrangements for removing other types of optical noise or for performing calibration
    • G01N15/075—

Abstract

The application relates to an infrared detection circuit, a light emitting control method and device thereof and household electrical appliance equipment. Then when the infrared emission device of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain an adjustable constant current source with a corresponding size, and the adjustable constant current source is used for controlling the infrared emission device to output extrauterine emission light with light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.

Description

Infrared detection circuit, light-emitting control method and device thereof, and household appliance
Technical Field
The present disclosure relates to the field of infrared technologies, and in particular, to an infrared detection circuit, a method and an apparatus for controlling light emission thereof, and a home appliance.
Background
With the rapid development of scientific technology, the infrared smoke detection technology is widely applied to the field of household appliances, and the concentration detection operation of oil smoke and dust particle substances in the environment is realized. The infrared smoke sensor is installed at a certain angle through the infrared transmitter and the infrared receiver, when smoke exists in the air, infrared rays transmitted by the infrared transmitter are subjected to diffuse reflection after encountering the smoke, and the infrared receiver receives signals to process the signals and perform smoke alarm. And when no smoke exists, the infrared receiver cannot receive the infrared signal, and at the moment, the alarm operation cannot be carried out.
However, the actual use environment of the household electrical appliance often has strong illumination, such as sunlight. Influenced by infrared light in the ambient light, very easily lead to infrared receiver can't receive the infrared signal after the smog diffuse reflection to make and can't in time carry out smog when smog concentration reaches the threshold value and report to the police. Therefore, the conventional infrared smoke detection technology has a disadvantage of poor detection reliability.
Disclosure of Invention
Therefore, it is necessary to provide an infrared detection circuit, a light emission control method and device thereof, and a household appliance, aiming at the problem of poor detection reliability of the conventional infrared smoke detection technology.
A light emission control method of an infrared detection circuit includes: acquiring the intensity of interference infrared rays in the environment;
analyzing according to the light intensity of the interference infrared ray to obtain an adjustable constant current source coefficient; and controlling an infrared emission device of the infrared detection circuit to emit infrared emission light with the light intensity larger than that of the interference infrared ray according to the adjustable constant current source coefficient.
In one embodiment, after the step of controlling the infrared emitting device of the infrared detection circuit to emit the infrared emitting light with the intensity greater than the intensity of the disturbing infrared ray according to the adjustable constant current source coefficient, the method further comprises: acquiring the intensity of infrared receiving light, wherein the intensity of the infrared receiving light is the intensity of infrared rays irradiated to an infrared receiving device of the infrared detection circuit; and analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared ray to obtain smoke concentration data.
In one embodiment, the step of analyzing the received infrared light intensity and the interfering infrared light intensity to obtain smoke concentration data includes: analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared ray to obtain a light intensity difference value; and analyzing according to the light intensity difference and a preset concentration relation to obtain smoke concentration data, wherein the preset concentration relation represents a corresponding relation between the light intensity difference and the smoke concentration data.
In one embodiment, the step of obtaining the intensity of the disturbing infrared light in the environment comprises: receiving the light intensity of the initial interference infrared ray collected and sent by an infrared receiving device of the infrared detection circuit; and when the initial interference infrared light intensity is smaller than a preset measuring range, recording the initial interference infrared light intensity as interference infrared light intensity, and executing the step of analyzing according to the interference infrared light intensity to obtain the adjustable constant current source coefficient.
In one embodiment, after the step of receiving the initial interference infrared light intensity collected and transmitted by the infrared receiving device of the infrared detection circuit, the method further includes: and when the initial interference infrared light intensity is larger than or equal to the preset measuring range, reducing the amplification factor of the infrared receiving device, and returning to the step of receiving the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit until the initial interference infrared light intensity is smaller than the preset measuring range.
In one embodiment, the intensity of the infrared emission light is two or more times the intensity of the interfering infrared light.
A light emission control device of an infrared detection circuit includes: the light intensity acquisition module is used for acquiring the light intensity of interference infrared rays in the environment; the adjusting parameter analysis module is used for analyzing according to the light intensity of the interference infrared ray to obtain an adjustable constant current source coefficient; and the emission control module is used for controlling an infrared emission device of the infrared detection circuit to emit infrared emission light with the light intensity larger than the light intensity of the interference infrared ray according to the adjustable constant current source coefficient.
An infrared detection circuit comprises an infrared emitting device, an infrared receiving device and a controller, wherein the infrared emitting device and the infrared receiving device are respectively connected with the controller, the infrared receiving device is used for collecting the intensity of interference infrared rays in the environment and sending the intensity to the controller, and the controller is used for controlling light emission according to the method.
In one embodiment, the infrared receiving device comprises an infrared receiver and an amplifier, the infrared receiver is connected with the amplifier, and the amplifier is connected with the controller.
In one embodiment, the infrared emitting device comprises an adjustable constant current source and an infrared emitter, wherein the adjustable constant current source is connected with the infrared emitter, and the adjustable constant current source is connected with the controller.
In one embodiment, the infrared detection circuit further comprises a communication and power supply circuit, and the controller is connected with the communication and power supply circuit.
A household appliance comprises the infrared detection circuit.
In one embodiment, the home device is a range hood.
According to the infrared detection circuit, the light emitting control method and device thereof and the household appliance, the interference infrared light intensity in the environment can be detected in real time in the working process of the infrared detection circuit. Then when the infrared emission device of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain an adjustable constant current source with a corresponding size, and the adjustable constant current source is used for controlling the infrared emission device to output extrauterine emission light with light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for controlling light emission of an infrared detection circuit according to an embodiment;
FIG. 2 is a schematic flow chart illustrating a method for controlling light emission of an infrared detection circuit according to another embodiment;
FIG. 3 is a schematic diagram of infrared light emission and reception in one embodiment;
FIG. 4 is a flowchart illustrating a method for controlling light emission of an infrared detection circuit according to yet another embodiment;
FIG. 5 is a flowchart illustrating a method for controlling light emission of an infrared detection circuit according to yet another embodiment;
FIG. 6 is a schematic diagram of a light-emitting control device of an infrared detection circuit according to an embodiment;
FIG. 7 is a schematic diagram of a light-emitting control device of an infrared detection circuit according to another embodiment;
FIG. 8 is a schematic diagram of an embodiment of an infrared detection circuit;
FIG. 9 is a schematic diagram of an infrared detection circuit according to another embodiment;
FIG. 10 is a schematic diagram of a smoke alarm in one embodiment;
fig. 11 is a schematic structural diagram of a home device in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a light emitting control method of an infrared detection circuit includes step S100, step S200, and step S300.
And step S100, obtaining the intensity of interference infrared rays in the environment.
Specifically, the intensity of the disturbing infrared ray is the intensity of the disturbing infrared ray in the environment where the infrared detection circuit is located. According to different environments of the infrared detection circuit, the type of the interference infrared ray and the intensity of the interference infrared ray are different, for example, when the infrared detection circuit is in a sunlight environment, the corresponding intensity of the interference infrared ray is the intensity of the infrared ray in the sunlight. Therefore, in one embodiment, each time the infrared detection circuit operates, the operation of obtaining the intensity of the disturbing infrared light is first performed to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device.
It can be understood that, in an embodiment, in order to ensure that the intensity of the infrared ray in the obtained environment can be reasonably represented, when the interference infrared ray is obtained, the infrared emitting device of the infrared detection circuit is ensured to be in a non-operating state, and the mutual influence between the infrared emitting light emitted by the infrared emitting device and the interference infrared ray is avoided. It should be noted that the manner in which the controller obtains the intensity of the disturbing infrared light is not exclusive, and in one embodiment, the disturbing infrared light is collected by an infrared receiving device of an infrared detection circuit and then sent to the controller. Namely, the controller obtains the corresponding interference infrared light intensity by accessing the infrared receiving device or the mode of actively issuing by the infrared receiving device.
And S200, analyzing according to the intensity of the interference infrared ray to obtain the adjustable constant current source coefficient.
Specifically, the adjustable constant current source coefficient is a coefficient for controlling the intensity of the light emitted by the infrared emitting device. The infrared emission device comprises an adjustable constant current source and an infrared emitter, wherein the adjustable constant current source is connected with the infrared emitter, and the adjustable constant current source is connected with the controller. The controller analyzes according to the obtained interference infrared light intensity to obtain an adjustable constant current source coefficient corresponding to the adjustable constant current source, so that the adjustable constant current source can send a current signal with a corresponding magnitude, and finally the infrared emitter is controlled to output infrared emission light with the intensity matched with the current signal, and the light emission control of the infrared emitter is realized. In this embodiment, through combining the interference infrared ray light intensity in the environment to the light-emitting control of infrared emission device, guarantee that the infrared emission light intensity of infrared emission device output is strong enough, can not appear influencing the receiving operation of follow-up infrared receiving arrangement to infrared emission owing to interfering the infrared ray.
It should be noted that, in an embodiment, the controller prestores a relationship curve between the current of the light emitting tube of the infrared emitting device and the light intensity, and in the actual analysis process, the current of the light emitting tube required by the current state is obtained by matching according to the relationship curve between the current of the interference infrared ray and the light intensity, and then the adjustable constant current source coefficient with the corresponding size is obtained according to the relationship between the current of the light emitting tube of the infrared emitting device and the adjustable constant current source coefficient.
It is understood that in another embodiment, the controller may directly control the infrared emitting device to start working, and the controller obtains the light intensity of the infrared emitting light in real time and compares the light intensity with the light intensity of the interfering infrared ray for analysis. If the light intensity of the infrared emission light is smaller than the light intensity of the interference infrared ray, changing the current of a light emitting tube of the infrared emission device until the light intensity of the infrared emission light is larger than the light intensity of the interference infrared ray, recording the current of the corresponding input light emitting tube at the moment, obtaining an adjustable constant current source coefficient with corresponding size according to the relation between the current of the light emitting tube and the adjustable constant current source coefficient, and finally realizing the light emission control of the infrared emission device according to the adjustable constant current source coefficient.
And step S300, controlling an infrared emitting device of the infrared detection circuit to emit infrared emitting light with the light intensity larger than the interference infrared light intensity according to the adjustable constant current source coefficient.
Specifically, in order to ensure that the infrared receiving device can effectively receive infrared light after diffuse reflection of the infrared emission light when receiving the infrared light after diffuse reflection of the infrared emission light and interference infrared light at the same time, the infrared emitting device is enabled to emit the infrared emission light with the light intensity stronger than that of the interference infrared light through the adjustment of the coefficient of the adjustable constant current source. It should be noted that the relationship between the intensity of the infrared emission light and the intensity of the interfering infrared light is not exclusive, and in one embodiment, the intensity of the infrared emission light is twice or more than twice of the intensity of the interfering infrared light through the adjustment and control operation of the adjustable constant current source coefficient. Therefore, even if the infrared emission light has loss in smoke diffuse reflection, the light intensity finally irradiated to the infrared receiving device is still larger than the interference infrared light intensity, and the working reliability of the infrared detection circuit is further improved.
In one embodiment, referring to fig. 2, after step S300, the method further includes step S400 and step S500.
And step S400, acquiring the intensity of infrared receiving light.
Specifically, the intensity of the infrared reception light is the intensity of the infrared light irradiated to the infrared receiving device of the infrared detection circuit. The infrared emitting device and the infrared receiving device are arranged at a certain angle, as shown in fig. 3, when there is no smoke between the infrared emitting device (infrared emitting unit) and the infrared receiving device (infrared receiving unit), the infrared emitting light emitted by the infrared emitting device cannot be transmitted to the infrared receiving device; when smoke exists between the infrared emitting device and the infrared receiving device, the infrared emitting light can irradiate to the infrared receiving device through diffuse reflection.
The infrared receiving device can collect the light intensity of interference infrared rays and can also receive infrared rays which are emitted by the infrared emitting device and subjected to diffuse reflection. Therefore, the infrared ray received by the infrared detection circuit in the actual working process comprises the interference infrared ray and the infrared ray which is emitted by the infrared emitting device and subjected to diffuse reflection. Therefore, in actual operation, the infrared receiver collects all infrared light intensity irradiated to the surface of the infrared receiver, obtains infrared receiving light intensity and sends the infrared receiving light intensity to the controller for processing.
And S500, analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared ray to obtain smoke concentration data.
Specifically, the received light intensity obtained by the controller includes both the interference infrared light intensity and the light intensity of the infrared light after the diffuse reflection of the smoke, so that the infrared light intensity part irradiated to the infrared receiving device by the infrared emitting device through the diffuse reflection can be obtained by combining the infrared received light intensity and the interference infrared light intensity for analysis, and the corresponding smoke concentration can be obtained through further analysis.
Further, in an embodiment, after the step S500 analyzes the smoke concentration data, the method further includes: and sending the smoke concentration data to a display device for displaying, and/or comparing and analyzing the smoke concentration data with a preset concentration threshold, and outputting an alarm signal when the smoke concentration data is greater than or equal to the preset concentration threshold. Namely, after the controller analyzes and obtains the smoke concentration data in the environment where the infrared detection circuit is located, the controller can further perform alarm control operation according to the smoke concentration, or can simply perform display operation of the smoke concentration data.
Referring to fig. 4, in one embodiment, step S500 includes step S510 and step S520.
Step S510, analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared to obtain a light intensity difference.
Specifically, when the infrared emitting device and the infrared receiving device operate simultaneously, the intensity of the infrared receiving light received by the infrared receiving device includes both the interference infrared portion and the actually required portion (i.e., the infrared light that is emitted by the infrared emitting device and irradiated to the infrared receiver by the diffuse reflection of smoke). Therefore, when smoke concentration analysis is carried out, the interference infrared part needs to be removed, namely, the difference value of the infrared receiving light intensity and the interference infrared light intensity is used as actually required light intensity to carry out smoke concentration data analysis.
And step S520, analyzing according to the relation between the light intensity difference and the preset concentration to obtain smoke concentration data.
Specifically, the preset concentration relationship represents a corresponding relationship between the light intensity difference and the smoke concentration data. In practical use, calibration light intensity and smoke concentration corresponding relation curves are drawn under different smoke concentrations through specific laboratory tests, and after the controller obtains a light intensity difference value, the controller directly performs calibration light intensity and smoke concentration corresponding relation curves with prestored concentration relation curves to obtain corresponding smoke concentration data.
Referring to fig. 5, in one embodiment, step S100 includes step S110 and step S120.
And step S110, receiving the light intensity of the initial interference infrared ray collected and sent by the infrared receiving device of the infrared detection circuit.
Specifically, in one embodiment, the infrared receiving device comprises an infrared receiver and an amplifier, wherein the infrared receiver is connected with the amplifier, and the amplifier is connected with the controller. The infrared receiver can detect the light intensity of interference infrared rays, converts the light intensity into a weak current signal, and transmits the weak current signal to the controller for analysis after being amplified by the amplifier.
It will be appreciated that in one embodiment, the amplifier is operated with a lower amplification factor to ensure that the amplification factor adjustment operation of the amplifier is more convenient when the initial interfering infrared light intensity is less than the predetermined measurement range. The intensity of a plurality of disturbing infrared rays is too large, and the amplifier adopts a large multiple, which can cause the intensity of the disturbing infrared rays to directly exceed the measuring range, at this time, the amplification factor of the amplifier needs to be gradually adjusted downwards, and the adjustment response is slow. Further, in one embodiment, the amplifier may first be operated with the minimum amplification factor directly, and then the position of the current light intensity within the full measurement range may be seen at the beginning, and then only the amplification factor of the amplifier needs to be adjusted finely.
And step S120, recording the initial interference infrared ray light intensity as the interference infrared ray light intensity when the initial interference infrared ray light intensity is smaller than the preset measuring range. And analyzing according to the intensity of the interference infrared ray to obtain the coefficient of the adjustable constant current source.
Referring to fig. 5, in an embodiment, after step S110, the method further includes step S130.
And step S130, when the initial interference infrared light intensity is larger than or equal to the preset measuring range, reducing the amplification factor of the infrared receiving device. And returning to the step S110 until the light intensity of the initial interference infrared ray is smaller than the preset measuring range.
Specifically, the preset measurement range is the size of the interference infrared light intensity received by the infrared receiving device in the full measurement range. The full measurement range is the light intensity range value which can be measured by the infrared detection circuit. In order to avoid the influence of the interference infrared light intensity on the infrared light after diffuse reflection, in the actual control operation, analysis is carried out according to the full measurement range and the preset measurement range, and the interference infrared light intensity is ensured to occupy a larger proportion in the full measurement range.
It is understood that the predetermined measurement range is not unique in size, and in one embodiment, the predetermined measurement range is 0.1 times the full measurement range, i.e., 0.1 of the full measurement range. For example, the full measurement range is 10-110, and the corresponding preset measurement range is 10 at this time, that is, the amplification factor of the amplifier needs to be adjusted, so that the light intensity of the interference infrared ray finally received by the controller is smaller than 10.
By adjusting the amplification factor, the component of the interference infrared light received by the controller occupying the whole measuring range is smaller, the infrared light which is output by the infrared emitter and irradiates the infrared receiving device through diffuse reflection in the subsequent analysis operation is ensured to have larger ratio, and the operation reliability of light emitting control is further ensured.
According to the light emitting control method of the infrared detection circuit, the interference infrared light intensity in the environment can be detected in real time in the working process of the infrared detection circuit. Then when the infrared emission device of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain an adjustable constant current source with a corresponding size, and the adjustable constant current source is used for controlling the infrared emission device to output extrauterine emission light with light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.
Referring to fig. 6, a light emitting control device of an infrared detection circuit includes: a light intensity acquisition module 100, an adjustment parameter analysis module 200 and an emission control module 300.
Specifically, the light intensity obtaining module 100 is used for obtaining the intensity of the interference infrared rays in the environment; the adjusting parameter analyzing module 200 is used for analyzing according to the intensity of the interference infrared ray to obtain an adjustable constant current source coefficient; the emission control module 300 is used for controlling the infrared emission device of the infrared detection circuit to emit infrared emission light with light intensity larger than the interference infrared light intensity according to the adjustable constant current source coefficient.
Referring to fig. 7, in one embodiment, after the emission control module 300, the apparatus further includes a smoke concentration analysis module 400. The smoke concentration analysis module 400 is used for acquiring the intensity of infrared receiving light; and analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared light to obtain smoke concentration data.
In one embodiment, the smoke concentration analyzing module 400 is further configured to analyze the light intensity of the received infrared light and the light intensity of the interfering infrared light to obtain a light intensity difference; and analyzing according to the relation between the light intensity difference and the preset concentration to obtain smoke concentration data.
In one embodiment, the light intensity obtaining module 100 is further configured to receive the light intensity of the initial interference infrared ray collected and transmitted by the infrared receiving device of the infrared detection circuit; when the initial interference infrared light intensity is smaller than the preset measuring range, recording the initial interference infrared light intensity as the interference infrared light intensity; and when the initial interference infrared light intensity is larger than or equal to the preset measuring range, reducing the amplification factor of the infrared receiving device, and returning to the operation of receiving the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit until the initial interference infrared light intensity is smaller than the preset measuring range.
For specific limitations of the light emission control device of the infrared detection circuit, reference may be made to the above limitations of the light emission control method of the infrared detection circuit, which are not described herein again. All or part of each module in the light-emitting control device of the infrared detection circuit can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The light emitting control device of the infrared detection circuit can detect the intensity of interference infrared rays in the environment in real time in the working process of the infrared detection circuit. Then when the infrared emission device of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain an adjustable constant current source with a corresponding size, and the adjustable constant current source is used for controlling the infrared emission device to output extrauterine emission light with light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.
Referring to fig. 8, an infrared detection circuit includes an infrared emitting device 10, an infrared receiving device 20 and a controller 30, wherein the infrared emitting device 10 and the infrared receiving device 20 are respectively connected to the controller 30, the infrared receiving device 20 is configured to collect the intensity of the interference infrared light in the environment and send the intensity to the controller 30, and the controller 30 is configured to perform light emission control according to the above method.
Specifically, the intensity of the disturbing infrared ray is the intensity of the disturbing infrared ray in the environment where the infrared detection circuit is located. According to different environments of the infrared detection circuit, the type of the interference infrared ray and the intensity of the interference infrared ray are different, for example, when the infrared detection circuit is in a sunlight environment, the corresponding intensity of the interference infrared ray is the intensity of the infrared ray in the sunlight. Therefore, in one embodiment, each time the infrared detection circuit is operated, the operation of obtaining the intensity of the disturbing infrared light is first performed to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device 20.
In one embodiment, referring to fig. 9, the infrared emitting device 10 includes an adjustable constant current source 11 and an infrared emitter 12, the adjustable constant current source 11 is connected to the infrared emitter 12, and the adjustable constant current source 11 is connected to the controller 30. The adjustable constant current source coefficient is a coefficient for controlling the intensity of the light emitted by the infrared emitting device 10. The controller 30 analyzes the obtained intensity of the interfering infrared ray to obtain an adjustable constant current source coefficient corresponding to the adjustable constant current source 11, so that the adjustable constant current source 11 sends a current signal with a corresponding magnitude, and finally controls the infrared emitter 12 to output the infrared emitting light with the intensity matched with the current signal, thereby realizing the light emitting control of the infrared emitting device 10. The present embodiment ensures that the intensity of the infrared emission light output by the infrared emission device 10 is strong enough by combining the intensity of the interfering infrared rays in the environment into the light emission control of the infrared emission device 10, and the subsequent receiving operation of the infrared emission light by the infrared receiving device 20 will not be affected by the interfering infrared rays.
It should be noted that, in an embodiment, the controller 30 prestores a relationship curve between the light intensity and the light emitting tube current of the infrared emitting device 10, and in the actual analysis process, the light emitting tube current required by the current state is obtained by matching according to the relationship curve between the interference infrared light intensity and the light emitting tube current and the light intensity, and then the adjustable constant current source coefficient with the corresponding size is obtained according to the relationship between the light emitting tube current of the infrared emitting device 10 and the adjustable constant current source coefficient.
It is understood that in another embodiment, the controller 30 may directly control the infrared emitting device 10 to start working, and the controller 30 obtains the light intensity of the infrared emitting light in real time and compares the light intensity with the light intensity of the interfering infrared rays for analysis. If the light intensity of the infrared emission light is smaller than the light intensity of the interference infrared ray, the current of the light emitting tube of the infrared emission device 10 is changed until the light intensity of the infrared emission light is larger than the light intensity of the interference infrared ray, the corresponding current of the input light emitting tube is recorded, the adjustable constant current source coefficient with the corresponding size is obtained according to the relation between the current of the light emitting tube and the adjustable constant current source coefficient, and finally the light emission control of the infrared emission device 10 is realized according to the adjustable constant current source coefficient.
In order to ensure that the infrared receiving device 20 can effectively receive the infrared light after the diffuse reflection of the infrared emission light and the interference infrared light when receiving the infrared light after the diffuse reflection of the infrared emission light and the interference infrared light at the same time, the infrared emitting device 10 is adjusted to emit the infrared emission light with the light intensity stronger than the light intensity of the interference infrared light by the adjustable constant current source coefficient. It should be noted that the relationship between the intensity of the infrared emission light and the intensity of the interfering infrared light is not exclusive, and in one embodiment, the intensity of the infrared emission light is twice or more than twice of the intensity of the interfering infrared light through the adjustment and control operation of the adjustable constant current source coefficient. Therefore, even if the infrared emission light has loss in smoke diffuse reflection, the light intensity finally irradiated to the infrared receiving device 20 is still greater than the light intensity of the interference infrared ray, and the working reliability of the infrared detection circuit is further improved.
The intensity of the infrared receiving light is the intensity of the infrared ray irradiated to the infrared receiving device 20 of the infrared detection circuit. The infrared transmitting device 10 and the infrared receiving device 20 are arranged at an angle, and when smoke does not exist between the infrared transmitting device 10 and the infrared receiving device 20, infrared transmitting light emitted by the infrared transmitting device 10 cannot be transmitted to the infrared receiving device 20; when smoke exists between the infrared transmitter 10 and the infrared receiver 20, the infrared emitted light can be diffused and reflected to the infrared receiver 20.
The infrared receiving device 20 can not only collect the intensity of the interfering infrared light, but also receive the infrared light emitted by the infrared emitting device 10 and subjected to diffuse reflection. Therefore, the infrared ray received by the infrared detection circuit in the actual operation process includes both the interference infrared ray and the infrared ray emitted by the infrared emitting device 10 and subjected to diffuse reflection. Therefore, in actual operation, the infrared receiver collects all the infrared light intensities irradiated on the surface of the infrared receiver, obtains the infrared received light intensity, and sends the infrared received light intensity to the controller 30 for processing.
The received light intensity obtained by the controller 30 includes both the intensity of the interfering infrared ray and the intensity of the infrared ray after diffuse reflection of the smoke, so that the infrared light intensity part irradiated to the infrared receiving device 20 by the infrared emitting device 10 through diffuse reflection can be obtained by analyzing the received light intensity and the interfering infrared ray intensity, and the corresponding smoke concentration can be obtained by further analyzing.
Further, in one embodiment, after the smoke concentration data is analyzed, the controller 30 further sends the smoke concentration data to a display device for displaying, and/or compares the smoke concentration data with a preset concentration threshold value for analysis, and outputs an alarm signal when the smoke concentration data is greater than or equal to the preset concentration threshold value. That is, after the controller 30 analyzes the smoke concentration data in the environment where the infrared detection circuit is located, an alarm control operation may be further performed according to the smoke concentration, or a simple display operation of only the smoke concentration data may be performed.
Referring to fig. 9, in one embodiment, the infrared receiving device 20 includes an infrared receiver 21 and an amplifier 22, the infrared receiver 21 is connected to the amplifier 22, and the amplifier 22 is connected to the controller 30.
Specifically, the infrared receiver 21 can detect the intensity of the interfering infrared rays, convert the intensity into a weak current signal, and transmit the weak current signal to the controller 30 for analysis after being amplified by the amplifier 22. It will be appreciated that in one embodiment, the amplifier 22 is operated with a lower amplification factor to ensure that the amplification factor of the amplifier 22 is adjusted more easily when the initial interfering infrared light intensity is less than the predetermined measurement range. If the intensity of the disturbing infrared rays is too large and the amplifier 22 uses a large factor, the intensity of the disturbing infrared rays will exceed the range directly, and the amplification factor of the amplifier 22 needs to be adjusted downwards step by step, so that the adjustment response is slow. Further, in one embodiment, the amplifier 22 may first directly operate with the minimum amplification factor, and then the position of the current light intensity within the full measurement range can be seen from the beginning, and then only the amplification factor of the amplifier 22 needs to be finely adjusted.
When the initial interference infrared light intensity is larger than or equal to the preset measuring range, the amplification factor of the infrared receiving device 20 is reduced, and the step of receiving the initial interference infrared light intensity collected and sent by the infrared receiving device 20 of the infrared detection circuit is returned until the initial interference infrared light intensity is smaller than the preset measuring range. And when the initial interference infrared light intensity is smaller than the preset measuring range, recording the initial interference infrared light intensity as the interference infrared light intensity. And executing the operation of analyzing according to the light intensity of the interference infrared ray to obtain the coefficient of the adjustable constant current source.
The preset measurement range is the intensity of the interference infrared ray received by the infrared receiver 20 in the full measurement range. The full measurement range is the light intensity range value which can be measured by the infrared detection circuit. In order to avoid the influence of the interference infrared light intensity on the infrared light after diffuse reflection, in the actual control operation, analysis is carried out according to the full measurement range and the preset measurement range, and the interference infrared light intensity is ensured to occupy a larger proportion in the full measurement range.
It is understood that the predetermined measurement range is not unique in size, and in one embodiment, the predetermined measurement range is 0.1 times the full measurement range, i.e., 0.1 of the full measurement range. For example, the full measurement range is 10-110, and the corresponding preset measurement range is 10, that is, the amplification factor of the amplifier 22 needs to be adjusted, so that the intensity of the interference infrared light finally received by the controller 30 is less than 10.
By adjusting the amplification factor, the component of the interference infrared light intensity received by the controller 30 occupying the whole measuring range is small, so that the infrared light emitted by the infrared emitter 12 in the subsequent analysis operation and irradiated to the infrared receiving device 20 through diffuse reflection has a larger ratio, and the operation reliability of the light emitting control is further ensured.
Referring to fig. 9, in an embodiment, the infrared detection circuit further includes a communication and power supply circuit 40, and the controller 30 is connected to the communication and power supply circuit 40. In this embodiment, the communication and power supply circuit 40 can provide a working power supply for the controller 30 and the like, and the communication circuit can implement communication operations with external devices or other devices, for example, the communication circuit is connected to a terminal device such as a touch pad or a mobile phone, so that a user can perform setting operations such as presetting concentration relationships and presetting measurement ranges through the touch pad or the terminal device.
The infrared detection circuit can detect the light intensity of interference infrared rays in the environment in real time in the working process of the infrared detection circuit. Then when the infrared emission device 10 of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain the adjustable constant current source 11 with the corresponding size, and the adjustable constant current source 11 controls the infrared emission device 10 to output extrauterine emission light with the light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.
Referring to fig. 10, a smoke alarm includes an alarm device 60 and the above infrared detection circuit, and the alarm device 60 is connected to the controller 30.
Specifically, the controller 30 analyzes the intensity of the received infrared light and the intensity of the interfering infrared light, so as to obtain the intensity of the infrared light irradiated from the infrared emitting device 10 to the infrared receiving device 20 through diffuse reflection, and further analyze the intensity of the infrared light to obtain corresponding smoke concentration data. The controller 30 also pre-stores a smoke concentration threshold, and when the smoke concentration data is greater than the smoke concentration threshold, the controller 30 controls the alarm device 60 to send alarm information to inform a user, so as to realize smoke alarm operation. It will be appreciated that the type of alarm device 60 is not exclusive and in one embodiment the alarm device 60 may be a voice alarm and/or a light alarm, i.e. an audible and/or light alarm may alert the user when the smoke concentration data is greater than a pre-stored smoke concentration threshold.
Above-mentioned smoke alarm at the in-process of infrared detection circuit work, can detect the interference infrared ray light intensity in the environment in real time. Then when the infrared emission device 10 of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain the adjustable constant current source 11 with the corresponding size, and the adjustable constant current source 11 controls the infrared emission device 10 to output extrauterine emission light with the light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than that of the interference infrared ray can be output to offset the interference of the infrared ray in the environment to the infrared detection operation, so that the detection reliability of the infrared detection circuit is effectively improved, and the accuracy of smoke alarm is further enhanced.
A household appliance comprises the infrared detection circuit.
Specifically, as shown in the above embodiments, the intensity of the disturbing infrared ray is the intensity of the disturbing infrared ray in the environment where the infrared detection circuit is located. According to different environments of the infrared detection circuit, the type of the interference infrared ray and the intensity of the interference infrared ray are different, for example, when the infrared detection circuit is in a sunlight environment, the corresponding intensity of the interference infrared ray is the intensity of the infrared ray in the sunlight. Therefore, in one embodiment, each time the infrared detection circuit is operated, the operation of obtaining the intensity of the disturbing infrared light is first performed to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device 20.
In order to ensure that the infrared receiving device 20 can effectively receive the infrared light after the diffuse reflection of the infrared emission light and the interference infrared light when receiving the infrared light after the diffuse reflection of the infrared emission light and the interference infrared light at the same time, the infrared emitting device 10 is adjusted to emit the infrared emission light with the light intensity stronger than the light intensity of the interference infrared light by the adjustable constant current source coefficient. It should be noted that the relationship between the intensity of the infrared emission light and the intensity of the interfering infrared light is not exclusive, and in one embodiment, the intensity of the infrared emission light is twice or more than twice of the intensity of the interfering infrared light through the adjustment and control operation of the adjustable constant current source coefficient. Therefore, even if the infrared emission light has loss in smoke diffuse reflection, the light intensity finally irradiated to the infrared receiving device 20 is still greater than the light intensity of the interference infrared ray, and the working reliability of the infrared detection circuit is further improved.
The intensity of the infrared receiving light is the intensity of the infrared ray irradiated to the infrared receiving device 20 of the infrared detection circuit. The infrared transmitting device 10 and the infrared receiving device 20 are arranged at an angle, and when smoke does not exist between the infrared transmitting device 10 and the infrared receiving device 20, infrared transmitting light emitted by the infrared transmitting device 10 cannot be transmitted to the infrared receiving device 20; when smoke exists between the infrared transmitter 10 and the infrared receiver 20, the infrared emitted light can be diffused and reflected to the infrared receiver 20.
The infrared receiving device 20 can not only collect the intensity of the interfering infrared light, but also receive the infrared light emitted by the infrared emitting device 10 and subjected to diffuse reflection. Therefore, the infrared ray received by the infrared detection circuit in the actual operation process includes both the interference infrared ray and the infrared ray emitted by the infrared emitting device 10 and subjected to diffuse reflection. Therefore, in actual operation, the infrared receiver 21 collects all the infrared light intensities irradiated to the surface thereof, obtains the infrared received light intensity, and sends the infrared received light intensity to the controller 30 for processing.
The received light intensity obtained by the controller 30 includes both the intensity of the interfering infrared ray and the intensity of the infrared ray after diffuse reflection of the smoke, so that the infrared light intensity part irradiated to the infrared receiving device 20 by the infrared emitting device 10 through diffuse reflection can be obtained by analyzing the received light intensity and the interfering infrared ray intensity, and the corresponding smoke concentration can be obtained by further analyzing. It is to be understood that the type of home device is not exclusive and in one embodiment the home device is a range hood.
Referring to fig. 11, in an embodiment, the household appliance further includes a display device 50, and the display device 50 is connected to the controller 30. After the controller 30 analyzes the smoke concentration data, the smoke concentration data is sent to the display device 50 for displaying, so that the user can know the smoke state in the environment in time.
Above-mentioned household electrical appliances can detect the interference infrared ray light intensity in the environment in real time at the in-process of infrared detection circuit work. Then when the infrared emission device 10 of the infrared detection circuit outputs infrared emission light, the interference infrared light intensity in the current state is combined to obtain the adjustable constant current source 11 with the corresponding size, and the adjustable constant current source 11 controls the infrared emission device 10 to output extrauterine emission light with the light intensity larger than the interference infrared light intensity. By the scheme, the infrared emission light with the light intensity larger than the interference infrared light intensity can be output to offset the interference of infrared rays in the environment to the infrared detection operation, and the detection reliability of the infrared detection circuit is effectively improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. A light-emitting control method of an infrared detection circuit is characterized by comprising the following steps:
acquiring the intensity of interference infrared rays in the environment;
analyzing according to the light intensity of the interference infrared ray to obtain an adjustable constant current source coefficient;
and controlling an infrared emission device of the infrared detection circuit to emit infrared emission light with the light intensity larger than that of the interference infrared ray according to the adjustable constant current source coefficient.
2. The method according to claim 1, wherein after the step of controlling the infrared emitting device of the infrared detection circuit to emit the infrared emitting light with the intensity greater than the intensity of the disturbing infrared ray according to the adjustable constant current source coefficient, the method further comprises:
acquiring the intensity of infrared receiving light, wherein the intensity of the infrared receiving light is the intensity of infrared rays irradiated to an infrared receiving device of the infrared detection circuit;
and analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared ray to obtain smoke concentration data.
3. The lighting control method of claim 2, wherein the step of analyzing the received infrared light intensity and the interfering infrared light intensity to obtain smoke concentration data comprises:
analyzing according to the intensity of the infrared receiving light and the intensity of the interference infrared ray to obtain a light intensity difference value;
and analyzing according to the light intensity difference and a preset concentration relation to obtain smoke concentration data, wherein the preset concentration relation represents a corresponding relation between the light intensity difference and the smoke concentration data.
4. The method of claim 1, wherein the step of obtaining the intensity of the disturbing infrared light in the environment comprises:
receiving the light intensity of the initial interference infrared ray collected and sent by an infrared receiving device of the infrared detection circuit;
and when the initial interference infrared light intensity is smaller than a preset measuring range, recording the initial interference infrared light intensity as interference infrared light intensity, and executing the step of analyzing according to the interference infrared light intensity to obtain the adjustable constant current source coefficient.
5. The method for controlling light emission according to claim 4, wherein after the step of receiving the initial disturbing infrared light intensity collected and transmitted by the infrared receiving device of the infrared detection circuit, the method further comprises:
and when the initial interference infrared light intensity is larger than or equal to the preset measuring range, reducing the amplification factor of the infrared receiving device, and returning to the step of receiving the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit until the initial interference infrared light intensity is smaller than the preset measuring range.
6. The light emission control method according to any one of claims 1 to 5, wherein the intensity of the infrared emission light is twice or more than the intensity of the disturbance infrared ray.
7. A light emission control device of an infrared detection circuit, comprising:
the light intensity acquisition module is used for acquiring the light intensity of interference infrared rays in the environment;
the adjusting parameter analysis module is used for analyzing according to the light intensity of the interference infrared ray to obtain an adjustable constant current source coefficient;
and the emission control module is used for controlling an infrared emission device of the infrared detection circuit to emit infrared emission light with the light intensity larger than the light intensity of the interference infrared ray according to the adjustable constant current source coefficient.
8. An infrared detection circuit is characterized by comprising an infrared emitting device, an infrared receiving device and a controller, wherein the infrared emitting device and the infrared receiving device are respectively connected with the controller, the infrared receiving device is used for collecting the intensity of interference infrared rays in the environment and sending the intensity to the controller, and the controller is used for carrying out light emitting control according to the method of any one of claims 1 to 6.
9. The infrared detection circuit of claim 8, wherein the infrared receiving device comprises an infrared receiver and an amplifier, the infrared receiver is connected to the amplifier, and the amplifier is connected to the controller.
10. The infrared detection circuit of claim 8, wherein the infrared emission device comprises an adjustable constant current source and an infrared emitter, the adjustable constant current source is connected to the infrared emitter, and the adjustable constant current source is connected to the controller.
11. The infrared detection circuit of claim 8, further comprising a communication and power supply circuit, wherein the controller is coupled to the communication and power supply circuit.
12. A household appliance comprising an infrared detection circuit according to any one of claims 8 to 11.
13. The appliance of claim 12, wherein the appliance is a range hood.
CN202010386715.0A 2020-05-09 2020-05-09 Infrared detection circuit, light-emitting control method and device thereof, and household appliance Pending CN111443018A (en)

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CN202010386715.0A CN111443018A (en) 2020-05-09 2020-05-09 Infrared detection circuit, light-emitting control method and device thereof, and household appliance

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Application Number Priority Date Filing Date Title
CN202010386715.0A CN111443018A (en) 2020-05-09 2020-05-09 Infrared detection circuit, light-emitting control method and device thereof, and household appliance

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CN111443018A true CN111443018A (en) 2020-07-24

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