CN212301223U - Infrared detection circuit, smoke alarm and household electrical appliance - Google Patents
Infrared detection circuit, smoke alarm and household electrical appliance Download PDFInfo
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- CN212301223U CN212301223U CN202020760669.1U CN202020760669U CN212301223U CN 212301223 U CN212301223 U CN 212301223U CN 202020760669 U CN202020760669 U CN 202020760669U CN 212301223 U CN212301223 U CN 212301223U
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Abstract
The application relates to an infrared detection circuit, a smoke alarm and household electrical appliance, which 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.
Description
Technical Field
The application relates to the technical field of infrared, in particular to an infrared detection circuit, a smoke alarm and household electrical appliances.
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.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an infrared detection circuit, a smoke alarm and a household appliance for solving the problem of poor detection reliability of the conventional infrared smoke detection technology.
An infrared detection circuit comprising: an infrared emitting device; the infrared receiving device is used for collecting the light intensity of interference infrared rays in the environment and sending the light intensity to the controller; and the controller is connected with the infrared transmitting device and the infrared receiving device and is used for analyzing according to the light intensity of the interference infrared rays to obtain an adjustable constant current source coefficient and controlling the infrared transmitting device to transmit infrared transmitting light with the light intensity larger than the light intensity of the interference infrared rays according to the adjustable constant current source coefficient.
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.
In one embodiment, the intensity of the infrared emission light is two or more times the intensity of the interfering infrared light.
A smoke alarm comprises an alarm device and the infrared detection circuit, wherein the alarm device is connected with the controller.
In one embodiment, the alarm device is a voice alarm and/or a light alarm.
A household appliance comprises the infrared detection circuit.
In one embodiment, the household appliance further comprises a display device, and the display device is connected with the controller.
In one embodiment, the home device is a range hood.
The infrared detection circuit, the smoke alarm and the household appliance 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.
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 diagram of an embodiment of an infrared detection circuit;
FIG. 2 is a schematic diagram 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 schematic diagram of a smoke alarm in one embodiment;
fig. 5 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, 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 interference infrared light intensity in an environment and send the interference infrared light intensity to the controller 30, and the controller 30 is configured to analyze the interference infrared light intensity to obtain an adjustable constant current source coefficient, and control the infrared emitting device 10 to emit infrared emission light with light intensity greater than the interference infrared light intensity according to the adjustable constant current source coefficient.
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.
It can be understood that, in an embodiment, in order to ensure that the intensity of the interference infrared rays in the obtained environment can reasonably represent the intensity of the infrared rays in the environment, when the interference infrared rays are obtained, the infrared emitting device 10 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 10 and the interference infrared rays is avoided. It should be noted that the manner of obtaining the intensity of the disturbing infrared light by the controller 30 is not exclusive, and in one embodiment, the disturbing infrared light is collected by the infrared receiving device 20 of the infrared detection circuit and then sent to the controller 30. That is, the controller 30 obtains the corresponding interference infrared ray light intensity by accessing the infrared receiving device 20 or by actively issuing from the infrared receiving device 20.
In one embodiment, referring to fig. 2, 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 emitting device 10 is disposed at an angle to the infrared receiving device 20, as shown in fig. 3, when there is no smoke between the infrared emitting device 10 (infrared emitting unit) and the infrared receiving device 20 (infrared receiving unit), the infrared emitting light emitted by the infrared emitting 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.
In one embodiment, the controller 30 analyzes the intensity of the received infrared light and the intensity of the interfering infrared light to obtain a difference; and analyzing according to the relation between the light intensity difference and the preset concentration to obtain smoke concentration data.
Specifically, when the infrared transmitter 10 and the infrared receiver 20 operate simultaneously, the intensity of the infrared receiving light received by the infrared receiver 20 includes both the interference infrared portion and the actually required portion (i.e., the infrared light transmitted by the infrared transmitter 10 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 the preset concentration relationship represents the corresponding relationship between the light intensity difference and the smoke concentration data. In practical use, the corresponding relation curve of the calibration light intensity and the smoke concentration is drawn under different smoke concentrations through a specific laboratory test, and after the light intensity difference is obtained, the controller 30 directly performs the calibration light intensity and the smoke concentration on the prestored concentration relation curve to obtain corresponding smoke concentration data.
In one embodiment, the controller 30 first receives the initial interference infrared ray intensity collected and transmitted by the infrared receiving device 20 of the infrared detection circuit; and then recording the initial interference infrared light intensity as the interference infrared light intensity when the initial interference infrared light intensity is smaller than the preset measuring range. 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. And when the initial interference infrared light intensity is greater than or equal to the preset measuring range, the amplification factor of the infrared receiving device 20 is reduced, and the operation of continuously 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.
Referring to fig. 2, 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. 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.
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. 2, in one 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. 4, the 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 is also pre-stored with 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. 5, 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 (10)
1. An infrared detection circuit, comprising:
an infrared emitting device;
the infrared receiving device is used for collecting the light intensity of interference infrared rays in the environment and sending the light intensity to the controller;
and the controller is connected with the infrared transmitting device and the infrared receiving device and is used for analyzing according to the light intensity of the interference infrared rays to obtain an adjustable constant current source coefficient and controlling the infrared transmitting device to transmit infrared transmitting light with the light intensity larger than the light intensity of the interference infrared rays according to the adjustable constant current source coefficient.
2. The infrared detection circuit of claim 1, 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.
3. The infrared detection circuit of claim 1, 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.
4. The infrared detection circuit of claim 1, further comprising a communication and power supply circuit, wherein the controller is coupled to the communication and power supply circuit.
5. The infrared detection circuit according to any one of claims 1 to 4, characterized in that the intensity of the infrared emission light is twice or more than twice the intensity of the disturbing infrared ray.
6. A smoke alarm comprising an alarm means and an infrared detection circuit as claimed in any one of claims 1 to 5, said alarm means being connected to said controller.
7. A smoke alarm according to claim 6, wherein said alarm means is a voice alarm and/or a light alarm.
8. An electric household appliance comprising an infrared detection circuit according to any one of claims 1 to 5.
9. The home appliance of claim 8, further comprising a display device, wherein the display device is connected to the controller.
10. The home device of claim 8, wherein the home device is a range hood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760669.1U CN212301223U (en) | 2020-05-09 | 2020-05-09 | Infrared detection circuit, smoke alarm and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760669.1U CN212301223U (en) | 2020-05-09 | 2020-05-09 | Infrared detection circuit, smoke alarm and household electrical appliance |
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| Publication Number | Publication Date |
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| CN212301223U true CN212301223U (en) | 2021-01-05 |
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| CN202020760669.1U Active CN212301223U (en) | 2020-05-09 | 2020-05-09 | Infrared detection circuit, smoke alarm and household electrical appliance |
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| CN (1) | CN212301223U (en) |
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