A smoke detector

Abstract

The application provides a smoke detector, which comprises a power supply, a light source, an optical receiving tube, a labyrinth assembly, a current adjusting module and a microcontroller; a first port of the current adjusting module is connected with the power supply, a second port of the current adjusting module is connected with the light source, a third port of the current adjusting module is connected with the microcontroller, the optical receiving tube is connected with the microcontroller, and the light source and the optical receiving tube are arranged in the labyrinth assembly, wherein: the power supply is used for providing a power supply current for the light source; the light source is used for emitting light; the optical receiving tube is used for receiving the light emitted by the light source and generating a corresponding first electric signal according to the light intensity of the light; the labyrinth assembly is used for obtaining air in a measured environment; the current adjusting module is used for adjusting the power supply current; and the microcontroller is used for controlling the current adjusting module to increase the power supply current in the case of obtaining the first electric signal. The structure of the smoke detector in the application improves the adaptability of the smoke detector.

Description

Technical Field

[0001] This application relates to the field of smoke detection technology, and more particularly to a smoke detector. Background Technology

[0002] In existing technologies, smoke detectors primarily utilize a maze structure for smoke detection. This maze consists of a specific smoke chamber structure, within which a light source and a receiver tube are located. The light source is a semiconductor device that converts electrical signals into infrared light signals. The receiver tube detects and receives the light emitted by the light source, converting the light signal back into an electrical signal. This allows the MCU to determine whether smoke has been detected based on the electrical signal generated by the receiver tube.

[0003] The light source of existing smoke detectors is usually a fixed intensity light source whose intensity cannot be adjusted. Smoke detectors cannot adjust the intensity of the light source according to the specific environment, which leads to the problem of poor adaptability of existing smoke detectors. Utility Model Content

[0004] This application provides a smoke detector that helps to solve the problem of poor compatibility of existing smoke detectors.

[0005] The smoke detector includes a power supply, a light source, an optical receiver, a maze assembly, a current regulation module, and a microcontroller. The first port of the current regulation module is connected to the power supply, the second port is connected to the light source, the third port is connected to the microcontroller, and the optical receiver is also connected to the microcontroller. The light source and optical receiver are housed within the maze assembly. Specifically: the power supply provides current to the light source; the light source emits light; the optical receiver receives the light emitted by the light source and generates a corresponding first electrical signal based on the light intensity; the maze assembly acquires the air in the measured environment; the current regulation module regulates the power supply current; and the microcontroller, upon acquiring the first electrical signal, controls the current regulation module to increase the power supply current.

[0006] As can be seen, in this embodiment, the light intensity of the light source is adjusted by the current adjustment module, which can arbitrarily adjust the alarm rate of the smoke detector pair according to the requirements, thereby improving the adaptability of the smoke detector. In addition, the elimination of the need to use an adjustable light source component saves production costs.

[0007] In one possible embodiment, the current regulation module includes a variable resistor module and a microcontroller, which, upon acquiring a first electrical signal, controls the current regulation module to increase the supply current of the power supply. The microcontroller is further configured to control the variable resistor module to reduce the circuit resistance between the power supply and the light source to increase the supply current.

[0008] In one possible embodiment, the variable resistor module includes multiple parallel branches, each of which includes a resistor and a switching device; the microcontroller is also used to control the closing of the switching device of at least one of the multiple parallel branches, thereby reducing circuit resistance and increasing supply current.

[0009] As can be seen from the embodiments of this application, the function of changing the resistance value of the variable resistance module is realized by multiple parallel branches, which eliminates the need to configure high-cost variable resistance components in the smoke detector, thereby reducing the production cost of the smoke detector.

[0010] In one possible embodiment, the switching device is an NPN transistor, with the base of the NPN transistor connected to the microcontroller, the collector of the NPN transistor connected to a resistor, and the emitter of the NPN transistor connected to a light source.

[0011] In one possible embodiment, the current regulation module further includes a constant current source module for maintaining the supply current in the event of voltage fluctuations in the power supply.

[0012] In one possible embodiment, the light source includes a red light emitting tube and an infrared light emitting tube, the light emitted by the light source includes red light and infrared light, and the electrical signal includes a red photoelectric signal generated by the optical receiver tube according to the light intensity of the red light and an infrared photoelectric signal generated by the optical receiver tube according to the light intensity of the infrared light.

[0013] In one possible embodiment, the microcontroller is further configured to determine whether smoke exists based on the red photoelectric signal and the infrared photoelectric signal, and, if smoke exists, determine the type of smoke based on the signal strength and rate of change of the red photoelectric signal and the signal strength and rate of change of the infrared photoelectric signal.

[0014] As can be seen from the embodiments of this application, by configuring different types of light sources such as infrared light emitting tubes and red light emitting tubes, the microcontroller can determine the type of smoke in the measured environment based on red light photoelectric signals and infrared light photoelectric signals, thereby improving the detection effect of the smoke detector.

[0015] In one possible embodiment, the optical receiver tube is further configured to receive light emitted by the light source during the compensation calibration period, and generate a corresponding second electrical signal based on the light intensity of the light emitted by the light source received during the compensation calibration period, wherein the smoke concentration in the maze assembly during the compensation calibration period is the target concentration; the microcontroller is further configured to acquire the second electrical signal, and adjust the power supply current according to the difference between the value of the second electrical signal and the target value by the current adjustment module, wherein the target value is the standard value corresponding to the target concentration.

[0016] In one possible embodiment, the smoke detector further includes a gas storage component for storing gas at a target smoke concentration; and a microcontroller unit for activating an exhaust component and the gas storage component during compensation calibration to achieve a target smoke concentration in the labyrinth component.

[0017] As can be seen in this embodiment, during the compensation calibration, the microcontroller can generate a second electrical signal based on the optical receiver tube to control the current adjustment module to compensate and adjust the smoke detector, thereby solving the problem of sampling deviation caused by the smoke detector's own attenuation, smoke, dust and other factors, and improving the applicability and service life of the smoke detector.

[0018] In one possible embodiment, the smoke detector further includes an operational amplifier module for amplifying the electrical signal at a preset magnification.

[0019] As can be seen from the smoke detectors in the above embodiments, the smoke detector, through the current adjustment module, can arbitrarily adjust the alarm rate of the smoke detector pair according to requirements, and solve the problem of sampling deviation, thereby improving the adaptability and service life of the smoke detector. The variable resistance module achieves the function of changing the resistance value through multiple parallel branches, reducing the production cost of the smoke detector. The detection effect of the smoke detector is improved by configuring infrared and red light emitting tubes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a smoke detector provided in an embodiment of this application;

[0022] Figure 2 This application provides a schematic diagram of the internal circuit structure of a variable resistor module according to an embodiment of the present application.

[0023] Figure 3 A schematic diagram of the connection relationship of an NPN transistor provided in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of another smoke detector provided in an embodiment of this application;

[0025] Figure 5 A flowchart illustrating a microprocessor's method for determining smoke type is provided in an embodiment of this application.

[0026] Figure 6 This is a schematic diagram of the internal structure of a maze component provided in an embodiment of this application.

[0027] Reference numerals: 100: Smoke detector; 101: Power supply; 102: Light source; 1021: Red light emitting tube; 1022: Infrared light emitting tube; 103: Optical receiver; 104: Maze assembly; 1041: Gas storage assembly; 1042: Exhaust assembly; 105: Current regulation module; 106: Microcontroller. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0029] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps is not limited to the steps listed, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products, or apparatuses.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] Example 1:

[0032] Please see Figure 1 , Figure 1This is a schematic diagram of a smoke detector provided in an embodiment of this application. The smoke detector 100 includes a power supply 101, a light source 102, an optical receiver 103, a maze assembly 104, a current adjustment module 105, and a microcontroller 106. The first port of the current adjustment module 105 is connected to the power supply 101, the second port of the current adjustment module 105 is connected to the light source 102, the third port of the current adjustment module 105 is connected to the microcontroller 106, the optical receiver 103 is connected to the microcontroller 106, and the light source 102 and the optical receiver 103 are disposed within the maze assembly 104.

[0033] The power supply 101 is used to supply power to the light source 102 so that the light source 102 can generate light. The power supply current is transmitted to the light source 102 through the current regulation module 105.

[0034] Light source 102 is used to emit light.

[0035] The optical receiver tube 103 is used to receive the light emitted by the light source 102 and generate a corresponding first electrical signal (such as a circuit or voltage signal) according to the light intensity.

[0036] It should be noted that the light source 102 and the optical receiver 103 are disposed inside the maze assembly 104. The inside of the maze is a dark chamber, and the optical receiver 103 will only receive the light generated by the light source 102.

[0037] Maze component 104 is used to acquire air in the environment under test.

[0038] It should be noted that the higher the smoke concentration in the air being measured, the higher the light intensity received by the optical receiver tube 103, and the higher (or lower) the value of the first electrical signal. Thus, the microcontroller 106 can determine the smoke concentration in the environment being measured based on the value of the first electrical signal.

[0039] The current regulation module 105 is used to regulate the power supply current of the power supply 101.

[0040] The microcontroller unit 106 (MCU) is used to control the current regulation module 105 to increase the supply current when the first electrical signal is received.

[0041] It should be noted that in this embodiment of the application, the smoke detector 100 is configured such that when the smoke concentration in the measured environment is 0 ppm, the optical receiver tube 103 does not generate the first electrical signal, and when the smoke concentration in the measured environment is greater than 0 ppm, the optical receiver tube 103 starts to generate the first electrical signal (the conditions for the optical receiver tube 103 to generate the first electrical signal can be set according to actual needs and will not be described in detail here).

[0042] When the microcontroller 106 acquires the first electrical signal, i.e., when there is smoke in the measured environment, the microcontroller 106 will control the current adjustment module 105 to increase the supply current, thereby increasing the light intensity of the light emitted by the light source 102, and further increasing the first electrical signal generated by the optical receiver tube 103 based on the light. When the control logic of the microcontroller 106 is to execute a smoke alarm if the value of the first electrical signal is greater than a preset threshold, the microcontroller 106 can control the current adjustment module 105 to increase the supply current to achieve functions such as adjusting the light intensity and accelerating the alarm rate.

[0043] As can be seen, in this embodiment, the light intensity of the light source is adjusted by the current adjustment module, which can arbitrarily adjust the alarm rate of the smoke detector pair according to the requirements, thereby improving the adaptability of the smoke detector. In addition, the elimination of the need to use an adjustable light source component saves production costs.

[0044] Optionally, the current regulation module includes a variable resistor module and a microcontroller, which, upon acquiring a first electrical signal, controls the current regulation module to increase the supply current of the power supply. The microcontroller is further configured to control the variable resistor module to reduce the circuit resistance between the power supply and the light source to increase the supply current.

[0045] Specifically, in this embodiment, the current regulation module achieves dynamic resistance adjustment through a variable resistor module. When the microcontroller detects the first electrical signal, it sends a control command to the variable resistor module to reduce the circuit resistance between the power supply output terminal and the light source. According to Ohm's law (I = V / R), under stable power supply voltage conditions, reducing the circuit resistance will directly lead to an increase in the supply current, thereby increasing the output power of the light source and thus improving the light intensity.

[0046] Furthermore, the variable resistor module can utilize electronic components such as digital potentiometers, MOSFETs, or relay arrays to achieve dynamic resistance adjustment. The microcontroller precisely controls the resistance value change by adjusting the control pin level or PWM signal duty cycle of the variable resistor module, ensuring that the increment of the supply current matches the strength or type of the first electrical signal. For example, when the first electrical signal indicates insufficient ambient light intensity, the microcontroller reduces the circuit resistance below a threshold, increasing the light source current to a preset operating range.

[0047] Optionally, the variable resistor module includes multiple parallel branches, each of which includes a resistor and a switching device; the microcontroller is also used to control the closing of the switching device of at least one of the multiple parallel branches, thereby reducing circuit resistance and increasing the supply current.

[0048] For details, please see Figure 2 , Figure 2This is a schematic diagram of the internal circuit structure of a variable resistance module provided in an embodiment of this application. The variable resistance module includes multiple parallel branches. Figure 2 The following explanation uses only three branches as an example. Each branch includes a resistor (R1, R2, R3) and a switching device (L1, L2, L3).

[0049] After L1 is closed, the light source is powered normally, and the resistance of the line is r (R1, R2, and R3 all have the same resistance value of r). If the microcontroller needs to control the variable resistor module to reduce the circuit resistance between the power supply and the light source, it can control either L2 or L3 to close, or control both L2 and L3 to close simultaneously.

[0050] Taking the closure of L2 as an example, after L2 is closed, the resistance of the line becomes r / 2, which is calculated using the formula for the resistance after parallel connection. That is, after L2 is closed, the resistance of the line decreases from r to r / 2. Similarly, a microcontroller can also increase the resistance of a line by controlling the opening of a switch on at least one branch of multiple parallel branches.

[0051] As can be seen from the embodiments of this application, the function of changing the resistance value of the variable resistance module is realized by multiple parallel branches, which eliminates the need to configure high-cost variable resistance components in the smoke detector, thereby reducing the production cost of the smoke detector.

[0052] Optionally, the switching device is an NPN transistor, with the base of the NPN transistor connected to the microcontroller, the collector of the NPN transistor connected to a resistor, and the emitter of the NPN transistor connected to a light source.

[0053] Specifically, please see Figure 3 , Figure 3 This is a schematic diagram illustrating the connection relationship of an NPN transistor provided in an embodiment of this application. Figure 3 The NPN transistor shown is specifically... Figure 2 The diagram shows transistors in any one of the multiple branches. The base of the NPN transistor is connected to the microcontroller, the collector is connected to a resistor, and the emitter is connected to a light source. The microcontroller controls the switching on and off of the NPN transistor's collector and the resistor via the base, thus enabling the opening and closing of each branch in the variable resistor module.

[0054] Optionally, the current regulation module also includes a constant current source module, used to maintain the supply current under the premise that the voltage of the power supply fluctuates.

[0055] In this embodiment, the constant current source module and the variable resistance module work together to form a composite control architecture. When external factors (such as voltage fluctuations caused by a decrease in battery power) cause changes in the power supply output voltage, the constant current source module samples the supply current value in real time and compares it with the target current value set by the microcontroller.

[0056] If a current deviation is detected (e.g., current decay due to voltage drop), the constant current source module immediately initiates negative feedback regulation: by adjusting the on-resistance of the internal power transistor or switching the compensation circuit topology, it dynamically offsets the influence of power supply voltage fluctuations on the supply current, so that the actual output current is stabilized within the set threshold range.

[0057] Optionally, the smoke detector also includes an operational amplifier module for amplifying the electrical signal at a preset rate.

[0058] Specifically, in this embodiment, the operational amplifier module is connected between the optical sensor and the microprocessor, forming a signal conditioning front end. When the amplitude of the original electrical signal output by the optical sensor is too low (typical value <10mV), the operational amplifier module amplifies the signal to a range that the microprocessor can accurately sample (e.g., 1-3V) through a programmable gain amplifier (PGA).

[0059] Example 2:

[0060] The above embodiments provide a smoke detector that accelerates alarm through a current adjustment module. Based on this, and while including multiple different light sources, the embodiments of this application also provide a more detailed smoke detector.

[0061] In the embodiments of this application, please refer to Figure 4 , Figure 4 This is a schematic diagram of another smoke detector provided in an embodiment of this application. The smoke detector 100 includes a power supply 101, a light source 102, an optical receiver 103, a maze assembly 104, a current adjustment module 105, and a microcontroller 106. The first port of the current adjustment module 105 is connected to the power supply 101, the second port of the current adjustment module 105 is connected to the light source 102, the third port of the current adjustment module 105 is connected to the microcontroller 106, the optical receiver 103 is connected to the microcontroller 106, and the light source 102 and the optical receiver 103 are disposed within the maze assembly 104.

[0062] For detailed descriptions of the power supply 101, optical receiver 103, labyrinth assembly 104, current regulation module 105, and microcontroller 106, please refer to the relevant content in Embodiment 1, which will not be repeated here.

[0063] The light source 102 includes a red light emitting tube 1021 and an infrared light emitting tube 1022. The red light emitting tube 1021 is specifically a semiconductor device that can convert electrical signals into red light signals, with a typical peak wavelength of 620-625nm.

[0064] The infrared light emitting diode 1022 is a semiconductor device that can convert electrical signals into infrared light signals, with a typical peak wavelength of 940nm.

[0065] When the light source 102 includes a red light emitting tube 1021 and an infrared light emitting tube 1022, the light emitted by the light source 102 includes red light and infrared light. The electrical signal generated by the optical receiving tube 103 specifically includes a red photoelectric signal generated based on the light intensity of the red light and an infrared photoelectric signal generated based on the light intensity of the infrared light.

[0066] It should be noted that each type of smoke has different refraction and transmittance under different light sources (red light and infrared light). Based on our design, when different types of smoke enter the maze, the electrical signals generated by the optical receiver tube 103 based on infrared light and red light will correspond to different light intensity (i.e. different electrical signal currents). In this way, the microcontroller 106 can determine the type of smoke.

[0067] Optionally, the microcontroller is also used to determine the type of smoke; see [link to relevant documentation]. Figure 5 , Figure 5 This application provides a schematic diagram of a microprocessor-based smoke type determination process, which can be based on... Figure 4 The smoke detector 100 shown is implemented including steps S501-S503:

[0068] S501: The microcontroller determines the presence of smoke based on red photoelectric signals and infrared photoelectric signals.

[0069] S502: In the presence of smoke, the microcontroller determines the type of smoke based on the signal strength and rate of change of the red photoelectric signal and the signal strength and rate of change of the infrared photoelectric signal.

[0070] For example, after the smoke from burning firewood enters the maze component, the microcontroller collects the current magnitudes of the red photoelectric signal and the infrared photoelectric signal, which are I1 and I2, respectively.

[0071] After the fumes enter the maze, the current magnitudes of the red photoelectric signal and the infrared photoelectric signal collected by the microcontroller are I3 and I4, respectively.

[0072] Based on this, through a large number of sample tests and directional tests, the current range of different smokes and the rate of current change over a certain period of time can be determined, thereby enabling the type of smoke to be determined based on the current range and the rate of change.

[0073] S503: The microcontroller triggers an alarm based on the type of smoke.

[0074] As can be seen from the embodiments of this application, by configuring different types of light sources such as infrared light emitting tubes and red light emitting tubes, the microcontroller can determine the type of smoke in the measured environment based on red light photoelectric signals and infrared light photoelectric signals, thereby improving the detection effect of the smoke detector.

[0075] Example 3:

[0076] The above-mentioned application embodiments provide a smoke detector in smoke detection mode. Based on this, the present application embodiments also provide a smoke detector in compensation calibration mode.

[0077] The compensation calibration mentioned here refers to the process of quantitatively compensating for the sampling deviations caused by factors such as the smoke detector's own attenuation, smoke, and dust (specifically including attenuation of light intensity from the light source and deviations in the first electrical signal value generated by the optical detector tube). This is done by adjusting the current to ensure the long-term stability and accuracy of the equipment.

[0078] Based on the embodiments of this application Figure 1 or Figure 4 The optical receiver tube in the smoke alarm shown is also used to receive light emitted by the light source during the compensation calibration period, and generate a corresponding second electrical signal based on the light intensity of the light emitted by the light source received during the compensation calibration period, wherein the smoke concentration in the maze assembly during the compensation calibration period is the target concentration.

[0079] Optionally, the smoke detector also includes a gas storage component for storing gas at a target smoke concentration; and a microcontroller unit for activating the exhaust component and the gas storage component during compensation calibration to achieve the target smoke concentration in the labyrinth component.

[0080] Specifically, the smoke concentration in the maze assembly is known during the compensation calibration. However, the smoke detector cannot accurately determine the smoke concentration in the maze assembly during the compensation calibration (this is because the smoke detector cannot determine whether the first electrical signal generated by the optical receiver is accurate). Therefore, in this example, the smoke concentration in the maze assembly is adjusted to a known concentration using the gas storage assembly.

[0081] Please see Figure 6 , Figure 6 This is a schematic diagram of the internal structure of a maze assembly provided in an embodiment of the present application. The maze assembly 104 includes a gas storage assembly 1041 and a gas exhaust assembly 1042.

[0082] The gas storage component 1041 stores gas with a smoke concentration of a target concentration (specifically, 0 ppm, 10 ppm, etc.) and is connected to a microprocessor (not shown in the figure), which turns it on or off based on instructions from the microprocessor. The exhaust component 1042 exhausts the gas inside the labyrinth component 104 and is also connected to the microprocessor, which turns it on or off based on instructions from the microprocessor.

[0083] In addition, the maze assembly 104 also includes an air intake assembly (not shown in the figure), which is used to draw air from the environment to be tested into the maze assembly 104 in smoke detection mode.

[0084] The gas storage component 1041 serves as a concentration reference source, filled with precisely calibrated standard smoke gas. When the system enters a compensation calibration cycle (such as at midnight daily or during power-on self-test), the microcontroller 106 first sends an opening command to the exhaust component 1042 to expel the residual gas inside the labyrinth component 104; simultaneously, it triggers the solenoid valve of the gas storage component 1041 to open, allowing the standard gas to be injected into the labyrinth component 104. This adjusts the smoke concentration in the labyrinth component 104 to the target concentration.

[0085] After adjusting the smoke concentration in the maze component to the target concentration, the microcontroller acquires the second electrical signal generated by the optical receiver tube and controls the current adjustment module to adjust the second electrical signal based on the current second electrical signal.

[0086] It should be noted that the microcontroller knows that the voltage amplitude (or current value) is linearly related to the real-time smoke concentration within the maze component. When the microcontroller acquires the second electrical signal, it will control the current regulation module based on the relationship between the second electrical signal and the voltage amplitude (or current value) corresponding to the target concentration to ensure that the second electrical signal and the target concentration satisfy the known linear relationship.

[0087] As can be seen in this embodiment, during the compensation calibration, the microcontroller can generate a second electrical signal based on the optical receiver tube to control the current adjustment module to compensate and adjust the smoke detector, thereby solving the problem of sampling deviation caused by the smoke detector's own attenuation, smoke, dust and other factors, and improving the applicability and service life of the smoke detector.

[0088] As can be seen from the smoke detectors in the above embodiments, the smoke detector, through the current adjustment module, can arbitrarily adjust the alarm rate of the smoke detector pair according to requirements, and solve the problem of sampling deviation, thereby improving the adaptability and service life of the smoke detector. The variable resistance module achieves the function of changing the resistance value through multiple parallel branches, reducing the production cost of the smoke detector. The detection effect of the smoke detector is improved by configuring infrared and red light emitting tubes.

[0089] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0090] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0091] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0092] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A smoke detector, characterized in that, The smoke detector includes a power supply, a light source, an optical receiver, a maze assembly, a current adjustment module, and a microcontroller. The first port of the current adjustment module is connected to the power supply, the second port is connected to the light source, the third port is connected to the microcontroller, and the optical receiver is connected to the microcontroller. The light source and the optical receiver are disposed within the maze assembly, wherein: The power supply is used to provide power current to the light source; The light source is used to emit light; The optical receiver tube is used to receive the light emitted by the light source and generate a corresponding first electrical signal according to the light intensity of the light. The maze component is used to acquire air in the environment under test; The current regulation module is used to regulate the power supply current of the power source; The microcontroller is used to control the current regulation module to increase the supply current when the first electrical signal is acquired.

2. The smoke detector according to claim 1, characterized in that, The current regulation module includes a variable resistor module. The microcontroller, upon acquiring the first electrical signal, controls the current regulation module to increase the supply current of the power supply, including: The microcontroller is also used to control the variable resistor module to reduce the circuit resistance between the power supply and the light source in order to increase the power supply current.

3. The smoke detector according to claim 2, characterized in that, The variable resistance module includes multiple parallel branches, each of which includes a resistor and a switching device. The microcontroller is also used to control the closing of the switching device of at least one branch in the multiple parallel branches, thereby reducing the circuit resistance and increasing the power supply current.

4. The smoke detector according to claim 3, characterized in that, The switching device is an NPN transistor. The base of the NPN transistor is connected to the microcontroller, the collector of the NPN transistor is connected to the resistor, and the emitter of the NPN transistor is connected to the light source.

5. The smoke detector according to any one of claims 1-4, characterized in that, The current regulation module also includes a constant current source module, which is used to maintain the supply current under the premise that the voltage of the power supply fluctuates.

6. The smoke detector according to any one of claims 1-4, characterized in that, The light source includes a red light emitting tube and an infrared light emitting tube. The light emitted by the light source includes red light and infrared light. The electrical signal includes a red photoelectric signal generated by the optical receiving tube based on the light intensity of the red light and an infrared photoelectric signal generated by the optical receiving tube based on the light intensity of the infrared light.

7. The smoke detector according to claim 6, characterized in that, The microcontroller is also used to determine whether smoke exists based on the red photoelectric signal and the infrared photoelectric signal, and, if smoke exists, to determine the type of smoke based on the signal strength and rate of change of the red photoelectric signal and the signal strength and rate of change of the infrared photoelectric signal.

8. The smoke detector according to any one of claims 1-4, characterized in that, The optical receiver tube is also used to receive the light emitted by the light source during the compensation calibration period, and generate a corresponding second electrical signal based on the light intensity of the light emitted by the light source received during the compensation calibration period, wherein the smoke concentration in the maze assembly during the compensation calibration period is the target concentration. The microcontroller is further configured to acquire the second electrical signal, and adjust the power supply current by the current adjustment module according to the difference between the value of the second electrical signal and the target value, wherein the target value is a standard value corresponding to the target concentration.

9. The smoke detector according to claim 8, characterized in that... The smoke detector also includes an exhaust component and a gas storage component, wherein the gas storage component is used for gas with a smoke concentration of the target concentration. The microcontroller is also configured to activate the exhaust assembly and the gas storage assembly during compensation calibration to achieve a target smoke concentration in the labyrinth assembly.

10. The smoke detector according to any one of claims 1-4, characterized in that, The smoke detector also includes an operational amplifier module; the operational amplifier module is used to amplify the electrical signal according to a preset factor.

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