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

Abstract

The present application relates to an infrared detection circuit and a light-emitting control method, device, and household appliance thereof. During the operation of the infrared detection circuit, the interfering infrared light intensity in the environment can be detected in real time. Then, when the infrared emitting device of the infrared detection circuit outputs infrared emission light, it will be combined with the interfering infrared light intensity in the current state to obtain an adjustable constant current source of corresponding size, and then the infrared emitting device is controlled by the adjustable constant current source to output an extrauterine emission light with a light intensity greater than the interfering infrared light intensity. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the interfering infrared light intensity to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit.

Description

Technical Field

[0001] The present application relates to the field of infrared technology, and in particular to an infrared detection circuit and a light emitting control method, device, and household appliance thereof. Background Art

[0002] With the rapid development of science and technology, infrared smoke detection technology has been widely used in the field of home appliances to detect the concentration of oil smoke and dust particles in the environment. The infrared smoke sensor is installed at a certain angle through an infrared transmitter and an infrared receiver. When there is smoke in the air, the infrared light emitted by the infrared transmitter will be diffusely reflected after encountering the smoke. The infrared receiver will receive the signal for processing and issue a smoke alarm. When there is no smoke, the infrared receiver cannot receive the infrared signal and will not issue an alarm.

[0003] However, the actual use environment of home appliances often has strong light, such as sunlight. Affected by the infrared light in the ambient light, it is easy for the infrared receiver to fail to receive the infrared signal after the diffuse reflection of smoke, so that the smoke alarm cannot be issued in time when the smoke concentration reaches the threshold. Therefore, the traditional infrared smoke detection technology has the disadvantage of poor detection reliability. Summary of the invention

[0004] Based on this, it is necessary to provide an infrared detection circuit and its light emitting control method, device, and household appliance to address the problem of poor detection reliability of traditional infrared smoke detection technology.

[0005] A light emission control method for an infrared detection circuit includes: obtaining the intensity of interfering infrared light in an environment;

[0006] An adjustable constant current source coefficient is obtained by analyzing the interfering infrared light intensity; and an infrared emitting device of the infrared detection circuit is controlled according to the adjustable constant current source coefficient to emit infrared emission light with a light intensity greater than the interfering infrared light intensity.

[0007] In one embodiment, after the step of controlling the infrared emitting device of the infrared detection circuit to emit infrared emitting light with a light intensity greater than the interfering infrared light intensity according to the adjustable constant current source coefficient, it also includes: obtaining infrared receiving light intensity, wherein the infrared receiving light intensity is the infrared intensity irradiated to the infrared receiving device of the infrared detection circuit; and obtaining smoke concentration data by analyzing the infrared receiving light intensity and the interfering infrared light intensity.

[0008] In one embodiment, the step of obtaining smoke concentration data by analyzing the infrared received light intensity and the interfering infrared light intensity includes: obtaining a light intensity difference by analyzing the infrared received light intensity and the interfering infrared light intensity; obtaining smoke concentration data by analyzing the light intensity difference and a preset concentration relationship, wherein the preset concentration relationship represents the correspondence between the light intensity difference and the smoke concentration data.

[0009] In one embodiment, the step of obtaining the interference infrared light intensity in the environment includes: receiving the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit; when the initial interference infrared light intensity is less than a preset measurement range, the initial interference infrared light intensity is recorded as the interference infrared light intensity, and executing the step of analyzing according to the interference infrared light intensity to obtain an adjustable constant current source coefficient.

[0010] In one embodiment, after the step of collecting and sending the initial interfering infrared light intensity by the infrared receiving device of the receiving infrared detection circuit, it also includes: when the initial interfering infrared light intensity is greater than or equal to the preset measurement range, reducing the amplification factor of the infrared receiving device, and returning to the step of collecting and sending the initial interfering infrared light intensity by the infrared receiving device of the receiving infrared detection circuit until the initial interfering infrared light intensity is less than the preset measurement range.

[0011] In one embodiment, the intensity of the infrared emission light is twice or more than twice the intensity of the interfering infrared light.

[0012] A light emitting control device for an infrared detection circuit comprises: a light intensity acquisition module for acquiring the interfering infrared light intensity in an environment; an adjustment parameter analysis module for analyzing the interfering infrared light intensity to obtain an adjustable constant current source coefficient; and an emission control module for controlling an infrared emission device of the infrared detection circuit to emit infrared emission light having a light intensity greater than the interfering infrared light intensity according to the adjustable constant current source coefficient.

[0013] An infrared detection circuit includes an infrared transmitting device, an infrared receiving device and a controller. The infrared transmitting device and the infrared receiving device are respectively connected to the controller. The infrared receiving device is used to collect the interfering infrared light intensity in the environment and send it to the controller. The controller is used to perform light emission control according to the above method.

[0014] In one embodiment, the infrared receiving device includes an infrared receiver and an amplifier, the infrared receiver is connected to the amplifier, and the amplifier is connected to the controller.

[0015] 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 to the infrared emitter, and the adjustable constant current source is connected to the controller.

[0016] In one embodiment, the infrared detection circuit further includes a communication and power supply circuit, and the controller is connected to the communication and power supply circuit.

[0017] A household appliance comprises the above infrared detection circuit.

[0018] In one embodiment, the household appliance is a range hood.

[0019] The above-mentioned infrared detection circuit and its light-emitting control method, device, and household appliance can detect the interfering infrared light intensity in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device of the infrared detection circuit outputs infrared emission light, it will be combined with the interfering infrared light intensity in the current state to obtain an adjustable constant current source of corresponding size, and then the infrared emitting device is controlled by the adjustable constant current source to output an extrauterine emission light with a light intensity greater than the interfering infrared light intensity. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the interfering infrared light intensity to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic flow chart of a light emission control method of an infrared detection circuit in an embodiment;

[0022] Figure 2 It is a schematic flow chart of a light emission control method of an infrared detection circuit in another embodiment;

[0023] Figure 3 This is a schematic diagram of infrared light emission and reception in one embodiment;

[0024] Figure 4 A schematic flow chart of a light emission control method of an infrared detection circuit in another embodiment;

[0025] Figure 5 A schematic flow chart of a light emission control method of an infrared detection circuit in yet another embodiment;

[0026] Figure 6This is a schematic diagram of the structure of a light emitting control device of an infrared detection circuit in an embodiment;

[0027] Figure 7 It is a schematic diagram of the structure of a light emitting control device of an infrared detection circuit in another embodiment;

[0028] Figure 8 This is a schematic diagram of the structure of an infrared detection circuit in an embodiment;

[0029] Fig. 9 This is a schematic diagram of the structure of an infrared detection circuit in another embodiment;

[0030] Fig.10 This is a schematic diagram of the structure of a smoke alarm in one embodiment;

[0031] Fig.11 Schematic diagram of the structure of a household appliance in one embodiment. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0033] See also Figure 1 , a light emitting control method of an infrared detection circuit includes step S100, step S200 and step S300.

[0034] Step S100, obtaining the intensity of interfering infrared light in the environment.

[0035] Specifically, the interfering infrared light intensity is the interfering infrared light intensity in the environment where the infrared detection circuit is located. Depending on the specific environment where the infrared detection circuit is located, the type of interfering infrared light and the magnitude of the interfering infrared light intensity will also be different. For example, when the infrared detection circuit is in a sunlight environment, the corresponding interfering infrared light intensity is the intensity of the infrared light in the sunlight. Therefore, in one embodiment, whenever the infrared detection circuit is working, it is necessary to first perform an operation to obtain the interfering infrared light intensity to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device.

[0036] It can be understood that in one embodiment, in order to ensure that the obtained interfering infrared light intensity in the environment can reasonably represent the strength of the infrared light in the environment, when obtaining the interfering infrared light, the infrared emitting device of the infrared detection circuit is ensured to be in a non-working state to avoid the mutual influence between the infrared emitted by the infrared emitting device and the interfering infrared light. It should be pointed out that the way for the controller to obtain the interfering infrared light intensity is not unique. In one embodiment, it can be collected by the infrared receiving device of the infrared detection circuit and then sent to the controller. That is, the controller obtains the corresponding interfering infrared light intensity by accessing the infrared receiving device or the infrared receiving device actively sends it.

[0037] Step S200, analyzing the intensity of the interfering infrared light to obtain an adjustable constant current source coefficient.

[0038] Specifically, the adjustable constant current source coefficient is a coefficient used to control the emission intensity of the infrared emitting device. The infrared emitting device includes 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. The controller analyzes the obtained interfering infrared light intensity to obtain the adjustable constant current source coefficient corresponding to the adjustable constant current source, so that the adjustable constant current source emits a current signal of corresponding size, and finally controls the infrared emitter to output infrared emission light with an intensity matching the current signal, thereby realizing the light emission control of the infrared emitting device. This embodiment combines the interfering infrared light intensity in the environment with the light emission control of the infrared emitting device, thereby ensuring that the infrared emission light intensity output by the infrared emitting device is strong enough, and the subsequent infrared receiving device will not be affected by the appearance of interfering infrared light.

[0039] It should be pointed out that in one embodiment, the controller pre-stores a curve of the relationship between the light-emitting tube current and the light intensity of the infrared emitting device. In the actual analysis process, the controller matches the interfering infrared light intensity with the curve of the relationship between the light-emitting tube current and the light intensity to obtain the light-emitting tube current required for the current state, and then obtains the adjustable constant current source coefficient of the corresponding size based on the relationship between the light-emitting tube current of the infrared emitting device and the adjustable constant current source coefficient.

[0040] It can be understood that in another embodiment, the controller can also directly control the infrared emitting device to start working, and the controller obtains the light intensity of the infrared emission light in real time, and compares and analyzes it with the interfering infrared light intensity. If the light intensity of the infrared emission light is less than the interfering infrared light intensity, the light-emitting tube current of the infrared emitting device is changed until the light intensity of the infrared emission light is greater than the interfering infrared light intensity, and the corresponding input light-emitting tube current size is recorded. According to the relationship between the light-emitting tube current and the adjustable constant current source coefficient, the corresponding adjustable constant current source coefficient is obtained, and finally the light emission control of the infrared emitting device is realized according to the adjustable constant current source coefficient.

[0041] Step S300, controlling the infrared emitting device of the infrared detection circuit to emit infrared emitting light with a light intensity greater than the interfering infrared light intensity according to the adjustable constant current source coefficient.

[0042] Specifically, in order to ensure that the infrared receiving device can effectively receive the infrared light after diffuse reflection of the infrared emission light and the interfering infrared light when simultaneously receiving the infrared light after diffuse reflection of the infrared emission light, the infrared emitting device emits infrared emission light with a light intensity stronger than the interfering infrared light intensity by adjusting the adjustable constant current source coefficient. It should be pointed out that the relationship between the intensity of the infrared emission light and the intensity of the interfering infrared light is not unique. In one embodiment, the intensity of the infrared emission light can be twice or more than twice the intensity of the interfering infrared light intensity by adjusting the adjustable constant current source coefficient. This ensures that even if the infrared emission light is lost in the diffuse reflection of smoke, the light intensity that is finally irradiated to the infrared receiving device is still greater than the intensity of the interfering infrared light, further improving the working reliability of the infrared detection circuit.

[0043] In one embodiment, see Figure 2 , after step S300, the method further includes step S400 and step S500.

[0044] Step S400, obtaining the intensity of infrared received light.

[0045] Specifically, the infrared receiving light intensity is the infrared intensity of the infrared receiving device irradiated to the infrared detection circuit. The infrared transmitting device and the infrared receiving device are arranged at a certain angle, such as Figure 3 As shown, when there is no smoke between the infrared transmitting device (infrared transmitting unit) and the infrared receiving device (infrared receiving unit), the infrared transmitting light emitted by the infrared transmitting device cannot be transmitted to the infrared receiving device; when there is smoke between the infrared transmitting device and the infrared receiving device, the infrared transmitting light can be diffusely reflected to the infrared receiving device.

[0046] The infrared receiving device can not only collect the intensity of interfering infrared light, but also receive the infrared light emitted by the infrared transmitting device and diffusely reflected. Therefore, the infrared light received by the infrared detection circuit in the actual working process includes both interfering infrared light and infrared light emitted by the infrared transmitting device and diffusely reflected. Therefore, in actual operation, the infrared receiver will collect the intensity of all infrared light irradiated on its surface, obtain the intensity of infrared received light and send it to the controller for processing.

[0047] Step S500, analyzing the intensity of the infrared received light and the intensity of the interfering infrared light to obtain smoke concentration data.

[0048] Specifically, the received light intensity obtained by the controller includes both the interfering infrared light intensity and the infrared light intensity after diffuse reflection from smoke. Therefore, by combining the infrared received light intensity and the interfering infrared light intensity for analysis, the infrared light intensity portion of the infrared transmitting device that is diffusely reflected to the infrared receiving device can be obtained. Further analysis can obtain the corresponding smoke concentration.

[0049] Furthermore, in one embodiment, after the smoke concentration data is obtained by analyzing in step S500, the method further includes: sending the smoke concentration data to a display device for display, 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. That is, after the controller analyzes and obtains the smoke concentration data in the environment where the infrared detection circuit is located at this time, it can further perform an alarm control operation according to the smoke concentration, or it can simply only perform an operation of displaying the smoke concentration data.

[0050] See also Figure 4 In one embodiment, step S500 includes step S510 and step S520.

[0051] Step S510, obtaining a light intensity difference based on the light intensity of the infrared receiving light and the light intensity of the interfering infrared light.

[0052] Specifically, when the infrared transmitting device and the infrared receiving device are running at the same time, the infrared receiving light intensity received by the infrared receiving device includes both the interfering infrared part and the actually required part (i.e., the infrared light sent by the infrared transmitting device and irradiated to the infrared receiver by smoke diffuse reflection). Therefore, when performing smoke density analysis, the interfering infrared part needs to be removed, that is, the difference between the infrared receiving light intensity and the interfering infrared light intensity is used as the actually required light intensity for smoke density data analysis.

[0053] Step S520, analyzing the relationship between the light intensity difference and the preset concentration to obtain smoke concentration data.

[0054] Specifically, the preset concentration relationship represents the correspondence between the light intensity difference and the smoke concentration data. In actual use, the corresponding relationship curve between the calibration light intensity and the smoke concentration is drawn under different smoke concentrations through specific laboratory tests. After obtaining the light intensity difference, the controller directly compares it with the pre-stored concentration relationship curve to obtain the corresponding smoke concentration data.

[0055] See also Figure 5 In one embodiment, step S100 includes step S110 and step S120.

[0056] Step S110, receiving the initial interfering infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit.

[0057] Specifically, in one embodiment, the infrared receiving device includes an infrared receiver and an amplifier, the infrared receiver is connected to the amplifier, and the amplifier is connected to the controller. The infrared receiver can detect the intensity of interfering infrared light and convert it into a weak current signal, which is amplified by the amplifier and transmitted to the controller for analysis.

[0058] It can be understood that in one embodiment, the amplifier first operates with a smaller amplification factor to ensure that when the initial interfering infrared light intensity is less than the preset measurement range, the amplifier's amplification factor adjustment operation is more convenient. If the interfering infrared light intensity is too large and the amplifier uses a larger multiple, it will cause the interfering infrared light intensity to directly exceed the range. At this time, the amplifier's amplification factor needs to be gradually adjusted downward, and the adjustment response is slow. Further, in one embodiment, the amplifier can first directly operate with the minimum amplification factor, at which time the current light intensity can be seen at the beginning within the full measurement range, and only the amplifier's amplification factor needs to be fine-tuned later.

[0059] Step S120, when the initial interfering infrared light intensity is less than the preset measurement range, the initial interfering infrared light intensity is recorded as the interfering infrared light intensity. The step of analyzing the interfering infrared light intensity to obtain an adjustable constant current source coefficient is performed.

[0060] See also Figure 5 In one embodiment, after step S110, the method further includes step S130.

[0061] Step S130, when the initial interfering infrared light intensity is greater than or equal to the preset measurement range, the amplification factor of the infrared receiving device is reduced, and the process returns to step S110 until the initial interfering infrared light intensity is less than the preset measurement range.

[0062] Specifically, the preset measurement range is the proportion of the interfering infrared light intensity received by the infrared receiving device in the full measurement range. The full measurement range is the range of light intensity values ​​that can be measured by the infrared detection circuit. In order to avoid the interference infrared light intensity having a greater impact on the infrared light after diffuse reflection, in actual control operations, analysis is performed based on the full measurement range and the preset measurement range to ensure that the interference infrared light intensity accounts for a larger proportion in the full measurement range.

[0063] It is understood that the size of the preset measurement range is not unique. In one embodiment, the preset measurement range is 0.1 times the full measurement range, that is, 0.1 of the entire measurement range. For example, if the full measurement range is 10-110, the corresponding preset measurement range is 10, which means that the amplification factor of the amplifier needs to be adjusted so that the interference infrared light intensity finally received by the controller is less than 10.

[0064] By adjusting the amplification factor, the interference infrared light intensity received by the controller accounts for a smaller proportion of the entire measurement range, ensuring that in subsequent analysis operations, the infrared emission light output by the infrared transmitter accounts for a larger proportion of the infrared light that is diffusely reflected and irradiated to the infrared receiving device, further ensuring the operational reliability of the light emitting control.

[0065] The above-mentioned light emission control method of the infrared detection circuit can detect the interfering infrared light intensity in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device of the infrared detection circuit outputs infrared emission light, it will combine the interfering infrared light intensity in the current state to obtain an adjustable constant current source of corresponding size, and then control the infrared emitting device to output an extracorporeal emission light with a light intensity greater than the interfering infrared light intensity through the adjustable constant current source. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the interfering infrared light intensity to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit.

[0066] See also Figure 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.

[0067] Specifically, the light intensity acquisition module 100 is used to acquire the interfering infrared light intensity in the environment; the adjustment parameter analysis module 200 is used to analyze the interfering infrared light intensity to obtain an adjustable constant current source coefficient; the emission control module 300 is used to control the infrared emission device of the infrared detection circuit to emit infrared emission light with a light intensity greater than the interfering infrared light intensity according to the adjustable constant current source coefficient.

[0068] See also Figure 7 In one embodiment, after the emission control module 300, the device further includes a smoke density analysis module 400. The smoke density analysis module 400 is used to obtain the intensity of infrared received light; and to obtain smoke density data by analyzing the intensity of infrared received light and the intensity of interfering infrared light.

[0069] In one embodiment, the smoke concentration analysis module 400 is further used to obtain the light intensity difference according to the infrared receiving light intensity and the interfering infrared light intensity; and obtain the smoke concentration data according to the relationship between the light intensity difference and the preset concentration.

[0070] In one embodiment, the light intensity acquisition module 100 is also used to receive the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit; when the initial interference infrared light intensity is less than the preset measurement range, the initial interference infrared light intensity is recorded as the interference infrared light intensity; when the initial interference infrared light intensity is greater than or equal to the preset measurement range, the amplification factor of the infrared receiving device is reduced, and the operation of receiving the initial interference infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit is returned until the initial interference infrared light intensity is less than the preset measurement range.

[0071] The specific definition of the light-emitting control device of the infrared detection circuit can be found in the definition of the light-emitting control method of the infrared detection circuit mentioned above, which will not be repeated here. Each module in the light-emitting control device of the infrared detection circuit can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0072] The light-emitting control device of the above-mentioned infrared detection circuit can detect the interfering infrared light intensity in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device of the infrared detection circuit outputs infrared emission light, it will combine the interfering infrared light intensity in the current state to obtain an adjustable constant current source of corresponding size, and then control the infrared emitting device to output an extracorporeal emission light with a light intensity greater than the interfering infrared light intensity through the adjustable constant current source. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the interfering infrared light intensity to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit.

[0073] See also Figure 8 An infrared detection circuit includes an infrared transmitting device 10, an infrared receiving device 20 and a controller 30. The infrared transmitting device 10 and the infrared receiving device 20 are respectively connected to the controller 30. The infrared receiving device 20 is used to collect the interference infrared light intensity in the environment and send it to the controller 30. The controller 30 is used to perform light emission control according to the above method.

[0074] Specifically, the interfering infrared light intensity is the interfering infrared light intensity in the environment where the infrared detection circuit is located. Depending on the specific environment where the infrared detection circuit is located, the type of interfering infrared light and the magnitude of the interfering infrared light intensity will also be different. For example, when the infrared detection circuit is in a sunlight environment, the corresponding interfering infrared light intensity is the intensity of the infrared light in the sunlight. Therefore, in one embodiment, whenever the infrared detection circuit is working, it is necessary to first perform an operation to obtain the interfering infrared light intensity to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device 20.

[0075] In one embodiment, see 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 used to control the emission intensity of the infrared emitting device 10. The controller 30 analyzes the obtained interfering infrared light intensity to obtain the adjustable constant current source coefficient corresponding to the adjustable constant current source 11, so that the adjustable constant current source 11 emits a current signal of corresponding size, and finally controls the infrared emitter 12 to output infrared emission light with an intensity matching the current signal, thereby realizing the light emission control of the infrared emitting device 10. This embodiment combines the interfering infrared light intensity in the environment with the light emission control of the infrared emitting device 10, so as to ensure that the infrared emission light intensity output by the infrared emitting device 10 is strong enough, and the subsequent infrared receiving device 20 will not be affected by the occurrence of interfering infrared light.

[0076] It should be pointed out that, in one embodiment, the controller 30 pre-stores a relationship curve between the light-emitting tube current and the light intensity of the infrared emitting device 10. In the actual analysis process, the light-emitting tube current required for the current state is obtained by matching the interfering infrared light intensity with the relationship curve between the light-emitting tube current and the light intensity, and then the adjustable constant current source coefficient of 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.

[0077] It can be understood that in another embodiment, the controller 30 can also directly control the infrared emitting device 10 to start working, and the controller 30 obtains the light intensity of the infrared emission light in real time, and compares and analyzes it with the interfering infrared light intensity. If the light intensity of the infrared emission light is less than the interfering infrared light intensity, the light-emitting tube current of the infrared emitting device 10 is changed until the light intensity of the infrared emission light is greater than the interfering infrared light intensity, and the corresponding input light-emitting tube current size is recorded. According to the relationship between the light-emitting tube current and the adjustable constant current source coefficient, the adjustable constant current source coefficient of the corresponding size is obtained, and finally the light emission control of the infrared emitting device 10 is realized according to the adjustable constant current source coefficient.

[0078] In order to ensure that the infrared receiving device 20 can effectively receive the infrared light after diffuse reflection of the infrared emission light and the interfering infrared light when simultaneously receiving the infrared light after diffuse reflection of the infrared emission light, the infrared emitting device 10 is adjusted by adjusting the adjustable constant current source coefficient so as to emit infrared emission light with a light intensity stronger than the light intensity of the interfering infrared light. It should be pointed out that the relationship between the light intensity of the infrared emission light and the light intensity of the interfering infrared light is not unique. In one embodiment, the light intensity of the infrared emission light can be adjusted by adjusting the adjustable constant current source coefficient so as to be twice or more than twice the light intensity of the interfering infrared light. This ensures that even if the infrared emission light is lost in the diffuse reflection of smoke, the light intensity finally irradiated to the infrared receiving device 20 is still greater than the light intensity of the interfering infrared light, further improving the working reliability of the infrared detection circuit.

[0079] The infrared receiving light intensity is the infrared intensity irradiated to the infrared receiving device 20 of the infrared detection circuit. The infrared emitting device 10 and the infrared receiving device 20 are arranged at a certain angle. When there is no smoke between the infrared emitting device 10 and the infrared receiving device 20, the infrared emitting light emitted by the infrared emitting device 10 cannot be transmitted to the infrared receiving device 20; when there is smoke between the infrared emitting device 10 and the infrared receiving device 20, the infrared emitting light can be irradiated to the infrared receiving device 20 through diffuse reflection.

[0080] The infrared receiving device 20 can not only collect the intensity of interfering infrared light, but also receive the infrared light emitted by the infrared emitting device 10 and diffusely reflected. Therefore, the infrared light received by the infrared detection circuit in the actual working process includes both interfering infrared light and infrared light emitted by the infrared emitting device 10 and diffusely reflected. Therefore, in actual operation, the infrared receiver collects the intensity of all infrared light irradiated on its surface, obtains the intensity of infrared received light and sends it to the controller 30 for processing.

[0081] The received light intensity obtained by the controller 30 includes both the interfering infrared light intensity and the infrared light intensity after diffuse reflection from the smoke. Therefore, by combining the infrared received light intensity and the interfering infrared light intensity for analysis, the infrared light intensity portion of the infrared transmitting device 10 that is diffusely reflected to the infrared receiving device 20 can be obtained, and further analysis can obtain the corresponding smoke concentration.

[0082] Furthermore, in one embodiment, after analyzing and obtaining the smoke concentration data, the controller 30 also sends the smoke concentration data to a display device for display, and / or compares and analyzes the smoke concentration data with a preset concentration threshold, and outputs an alarm signal when the smoke concentration data is greater than or equal to the preset concentration threshold. That is, after analyzing and obtaining the smoke concentration data in the environment where the infrared detection circuit is located at this time, the controller 30 may further perform an alarm control operation according to the smoke concentration, or may simply only perform an operation of displaying the smoke concentration data.

[0083] See also 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 .

[0084] Specifically, the infrared receiver 21 can detect the interfering infrared light intensity and convert it into a weak current signal, which is then amplified by the amplifier 22 and transmitted to the controller 30 for analysis. It can be understood that in one embodiment, the amplifier 22 first operates at a smaller amplification factor to ensure that when the initial interfering infrared light intensity is less than the preset measurement range, the amplification factor adjustment operation of the amplifier 22 is more convenient. If the interfering infrared light intensity is too large and the amplifier 22 uses a larger multiple, the interfering infrared light intensity will directly exceed the range. At this time, the amplification factor of the amplifier 22 needs to be gradually adjusted downward, and the adjustment response is slow. Further, in one embodiment, the amplifier 22 can first directly operate at the minimum amplification factor. At this time, the position of the current light intensity in the full measurement range can be seen at the beginning, and the amplification factor of the amplifier 22 only needs to be fine-tuned later.

[0085] When the initial interfering infrared light intensity is greater than or equal to the preset measurement range, the amplification factor of the infrared receiving device 20 is reduced, and the step of returning to the step of receiving the initial interfering infrared light intensity collected and sent by the infrared receiving device 20 of the infrared detection circuit is returned until the initial interfering infrared light intensity is less than the preset measurement range. When the initial interfering infrared light intensity is less than the preset measurement range, the initial interfering infrared light intensity is recorded as the interfering infrared light intensity. The operation of analyzing the interfering infrared light intensity to obtain the adjustable constant current source coefficient is performed.

[0086] The preset measurement range is the proportion of the interference infrared light intensity received by the infrared receiving device 20 in the full measurement range. The full measurement range is the range of light intensity values ​​that can be measured by the infrared detection circuit. In order to avoid the interference infrared light intensity having a greater impact on the infrared light after diffuse reflection, in actual control operations, analysis is performed based on the full measurement range and the preset measurement range to ensure that the interference infrared light intensity accounts for a larger proportion in the full measurement range.

[0087] It is understood that the size of the preset measurement range is not unique. In one embodiment, the preset measurement range is 0.1 times the full measurement range, that is, 0.1 of the entire measurement range. For example, if the full measurement range is 10-110, the corresponding preset measurement range is 10, which means that the amplification factor of the amplifier 22 needs to be adjusted so that the interference infrared light intensity finally received by the controller 30 is less than 10.

[0088] By adjusting the amplification factor, the interference infrared light intensity received by the controller 30 accounts for a smaller proportion of the entire measurement range, ensuring that in subsequent analysis operations, the infrared emission light output by the infrared transmitter 12 has a larger proportion of the infrared light that is diffusely reflected and irradiated to the infrared receiving device 20, further ensuring the operational reliability of the light emitting control.

[0089] See also Fig. 9 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 working power to the controller 30, etc., and the communication circuit can realize communication operations with external devices or other devices. For example, the communication circuit is connected to a terminal device such as a touch panel or a mobile phone, so that the user can perform setting operations such as preset concentration relationships and preset measurement ranges through the touch panel or the terminal device.

[0090] The above-mentioned infrared detection circuit can detect the intensity of interfering infrared light in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device 10 of the infrared detection circuit outputs infrared emission light, it will combine the intensity of interfering infrared light in the current state to obtain an adjustable constant current source 11 of corresponding size, and then control the infrared emitting device 10 to output an extracorporeal emission light with a light intensity greater than the intensity of interfering infrared light through the adjustable constant current source 11. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the intensity of interfering infrared light, so as to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit.

[0091] See also Fig.10 , a smoke alarm comprises an alarm device 60 and the above-mentioned infrared detection circuit, wherein the alarm device 60 is connected to the controller 30.

[0092] Specifically, the controller 30 analyzes the infrared receiving light intensity and the interfering infrared light intensity to obtain the infrared light intensity portion of the infrared emitting device 10 irradiated to the infrared receiving device 20 through diffuse reflection, and further analyzes to obtain the corresponding smoke concentration data. The controller 30 also pre-stores a smoke concentration threshold. When the smoke concentration data is greater than the smoke concentration threshold, the controller 30 will control the alarm device 60 to send an alarm message to inform the user to implement the smoke alarm operation. It can be understood that the type of alarm device 60 is not unique. In one embodiment, the alarm device 60 can be a voice alarm and / or a light alarm, that is, when the smoke concentration data is greater than the pre-stored smoke concentration threshold, the user is reminded by a sound alarm and / or a light alarm.

[0093] The above-mentioned smoke alarm can detect the intensity of interfering infrared light in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device 10 of the infrared detection circuit outputs infrared emission light, it will combine the intensity of interfering infrared light in the current state to obtain an adjustable constant current source 11 of corresponding size, and then control the infrared emitting device 10 to output an external emission light with a light intensity greater than the intensity of interfering infrared light through the adjustable constant current source 11. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the intensity of interfering infrared light, so as to offset the interference of infrared light in the environment on the infrared detection operation, effectively improve the detection reliability of the infrared detection circuit, and further enhance the accuracy of the smoke alarm.

[0094] A household appliance comprises the above infrared detection circuit.

[0095] Specifically, the infrared detection circuit is specifically as shown in the above embodiments, and the interfering infrared light intensity is the interfering infrared light intensity in the environment where the infrared detection circuit is located. According to the different environments where the infrared detection circuit is located, the types of interfering infrared light and the magnitude of the interfering infrared light intensity will also be different. For example, when the infrared detection circuit is in a sunlight environment, the corresponding interfering infrared light intensity is the intensity of infrared light in the sunlight. Therefore, in one embodiment, whenever the infrared detection circuit is working, it is necessary to first perform an operation to obtain the interfering infrared light intensity to ensure that the subsequently emitted infrared light can be effectively received by the infrared receiving device 20.

[0096] In order to ensure that the infrared receiving device 20 can effectively receive the infrared light after diffuse reflection of the infrared emission light and the interfering infrared light when simultaneously receiving the infrared light after diffuse reflection of the infrared emission light, the infrared emitting device 10 is adjusted by adjusting the adjustable constant current source coefficient so as to emit infrared emission light with a light intensity stronger than the light intensity of the interfering infrared light. It should be pointed out that the relationship between the light intensity of the infrared emission light and the light intensity of the interfering infrared light is not unique. In one embodiment, the light intensity of the infrared emission light can be adjusted by adjusting the adjustable constant current source coefficient so as to be twice or more than twice the light intensity of the interfering infrared light. This ensures that even if the infrared emission light is lost in the diffuse reflection of smoke, the light intensity finally irradiated to the infrared receiving device 20 is still greater than the light intensity of the interfering infrared light, further improving the working reliability of the infrared detection circuit.

[0097] The infrared receiving light intensity is the infrared intensity irradiated to the infrared receiving device 20 of the infrared detection circuit. The infrared emitting device 10 and the infrared receiving device 20 are arranged at a certain angle. When there is no smoke between the infrared emitting device 10 and the infrared receiving device 20, the infrared emitting light emitted by the infrared emitting device 10 cannot be transmitted to the infrared receiving device 20; when there is smoke between the infrared emitting device 10 and the infrared receiving device 20, the infrared emitting light can be irradiated to the infrared receiving device 20 through diffuse reflection.

[0098] The infrared receiving device 20 can not only collect the intensity of interfering infrared light, but also receive the infrared light emitted by the infrared emitting device 10 and diffusely reflected. Therefore, the infrared light received by the infrared detection circuit in the actual working process includes both interfering infrared light and infrared light emitted by the infrared emitting device 10 and diffusely reflected. Therefore, in actual operation, the infrared receiver 21 collects the intensity of all infrared light irradiated on its surface, obtains the intensity of infrared received light and sends it to the controller 30 for processing.

[0099] The received light intensity acquired by the controller 30 includes both the interfering infrared light intensity and the infrared light intensity after diffuse reflection from smoke. Therefore, by analyzing the infrared received light intensity and the interfering infrared light intensity, the infrared light intensity portion of the infrared emitting device 10 irradiated to the infrared receiving device 20 after diffuse reflection can be obtained, and further analysis can be performed to obtain the corresponding smoke concentration. It can be understood that the type of household electrical appliances is not unique. In one embodiment, the household electrical appliance is a range hood.

[0100] See also Fig.11 In one embodiment, the household appliance further includes a display device 50, which is connected to the controller 30. After the controller 30 analyzes and obtains the smoke density data, it also sends the smoke density data to the display device 50 for display, so that the user can know the smoke status in the environment in time.

[0101] The above-mentioned household appliance can detect the intensity of interfering infrared light in the environment in real time during the operation of the infrared detection circuit. Then, when the infrared emitting device 10 of the infrared detection circuit outputs infrared emission light, it will combine the intensity of interfering infrared light in the current state to obtain an adjustable constant current source 11 of corresponding size, and then control the infrared emitting device 10 to output an extracorporeal emission light with a light intensity greater than the intensity of interfering infrared light through the adjustable constant current source 11. Through the above scheme, it is possible to output infrared emission light with a light intensity greater than the intensity of interfering infrared light, so as to offset the interference of infrared light in the environment on the infrared detection operation, and effectively improve the detection reliability of the infrared detection circuit.

[0102] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A light emission control method for an infrared detection circuit, characterized in that: include: Obtain the interfering infrared light intensity in the environment; An adjustable constant current source coefficient is obtained by analyzing the interfering infrared light intensity; According to the adjustable constant current source coefficient, the infrared emitting device of the infrared detection circuit is controlled to emit infrared emitting light having a light intensity greater than the interfering infrared light intensity; The step of analyzing the interfering infrared light intensity to obtain the adjustable constant current source coefficient includes: matching the interfering infrared light intensity, the relationship curve between the light emitting tube current and the light intensity of the infrared emitting device to obtain the light emitting tube current required for the current state; The adjustable constant current source coefficient is obtained by analyzing the relationship between the light emitting tube current, the light emitting tube current of the infrared emitting device and the adjustable constant current source coefficient.

2. The light emission control method according to claim 1, characterized in that: After the step of controlling the infrared emitting device of the infrared detection circuit to emit infrared emitting light having a light intensity greater than the interfering infrared light intensity according to the adjustable constant current source coefficient, the method further includes: Acquire the infrared received light intensity, where the infrared received light intensity is the infrared intensity of the infrared receiving device irradiated to the infrared detection circuit; The smoke concentration data is obtained by analyzing the intensity of the infrared received light and the intensity of the interfering infrared light.

3. The light emission control method according to claim 2, characterized in that: The step of analyzing the intensity of the infrared received light and the intensity of the interfering infrared light to obtain smoke concentration data comprises: The light intensity difference is obtained by analyzing the light intensity of the infrared receiving light and the light intensity of the interfering infrared light; The smoke concentration data is obtained by analyzing the light intensity difference and the preset concentration relationship, and the preset concentration relationship represents the corresponding relationship between the light intensity difference and the smoke concentration data.

4. The light emission control method according to claim 1, characterized in that: The step of obtaining the intensity of interfering infrared light in the environment comprises: The initial interfering infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit; When the initial interfering infrared light intensity is less than the preset measurement range, the initial interfering infrared light intensity is recorded as the interfering infrared light intensity, and the step of analyzing the interfering infrared light intensity to obtain the adjustable constant current source coefficient is performed.

5. The light emission control method according to claim 4, characterized in that: After the step of receiving the initial interfering infrared light intensity collected and sent by the infrared receiving device of the infrared detection circuit, the method further includes: When the initial interfering infrared light intensity is greater than or equal to the preset measurement range, the amplification factor of the infrared receiving device is reduced, and the process returns to the step of collecting and sending the initial interfering infrared light intensity by the infrared receiving device of the receiving infrared detection circuit until the initial interfering infrared light intensity is less than the preset measurement range.

6. The light emission control method according to any one of claims 1 to 5, characterized in that: The light intensity of the infrared emission light is twice or more than twice the light intensity of the interfering infrared light.

7. An infrared detection circuit, characterized in that: It includes an infrared transmitting device, an infrared receiving device and a controller, wherein the infrared transmitting device and the infrared receiving device are respectively connected to the controller, the infrared receiving device is used to collect the interfering infrared light intensity in the environment and send it to the controller, and the controller is used to perform light emission control according to the method described in any one of claims 1-6.

8. The infrared detection circuit according to claim 7, characterized in that: The infrared receiving device comprises an infrared receiver and an amplifier, wherein the infrared receiver is connected to the amplifier, and the amplifier is connected to the controller.

9. The infrared detection circuit according to claim 7, characterized in that: The infrared emitting device comprises an adjustable constant current source and an infrared emitter, wherein the adjustable constant current source is connected to the infrared emitter, and the adjustable constant current source is connected to the controller.

10. The infrared detection circuit according to claim 7, characterized in that: It also includes a communication and power supply circuit, and the controller is connected to the communication and power supply circuit.

11. A household appliance, characterized in that: Includes the infrared detection circuit as described in any one of claims 7-10.

12. The household appliance according to claim 11, characterized in that: The household electrical appliance is a range hood.

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