Subminiature smoke detection alarm

Abstract

The utility model discloses a subminiature smoke detection alarm, which comprises a middle shell, a surface shell arranged above the middle shell, an insect-proof net arranged between the surface shell and the middle shell, a top cover arranged on the surface shell, keys arranged on the surface shell, a buzzer module arranged at the top of the middle shell, and a bottom shell arranged at the bottom of the middle shell, the power source and the maze are arranged in the middle shell, the PCB and the anti-disassembly switch are installed on the maze, and the installation plate is installed at the bottom of the bottom shell. A main control module, a smoke detection module, an infrared receiving module, an infrared transmitting module, a program burning port module and a temperature detection module are arranged on the PCB; the corresponding ends of the main control module are electrically connected with the corresponding ends of a smoke detection module, an infrared receiving module, an infrared transmitting module, a program burning port module, a temperature detection module, a power supply, an anti-disassembly switch and a buzzer module.

Description

An ultra-miniature smoke detector alarm Technical Field

[0001] This utility model relates to the field of alarm technology, and in particular to an ultra-miniature smoke detector alarm. Background Technology

[0002] Current Status and Shortcomings of Traditional Smoke Detectors

[0003] Larger size:

[0004] Traditional smoke detectors are typically large, taking up considerable space and affecting aesthetics when installed indoors. For example, some traditional smoke detectors can be over 15 centimeters in diameter and quite thick, making them appear obtrusive when installed on ceilings or walls. In spaces with limited capacity (such as small apartments or narrow corridors), the excessive size of traditional smoke detectors can lead to installation difficulties.

[0005] Single function:

[0006] Traditional smoke detectors primarily function to detect smoke and issue an alarm, lacking other auxiliary functions. For example, most traditional alarms lack temperature detection capabilities, making it impossible to use temperature changes to help determine the likelihood of a fire, thus easily leading to false alarms or missed alarms.

[0007] Traditional alarms typically lack remote control or linkage functions, making them inconvenient for users to operate via remote control or in conjunction with other devices.

[0008] Insufficient sensitivity and accuracy:

[0009] Traditional smoke detection modules have low sensitivity and are weak at detecting low concentrations of smoke. For example, in the early stages of a fire, when the smoke concentration is low, traditional alarms may not be able to detect the smoke in time, resulting in alarm delays. Traditional alarms also have weak signal processing capabilities and are easily affected by external interference (such as insects entering or dust accumulation), leading to frequent false alarms.

[0010] Lacks anti-tamper features:

[0011] Traditional smoke detectors typically lack tamper-proof designs, allowing users to easily disassemble them. This can lead to equipment damage or malicious destruction, affecting the normal operation of the alarm. The lack of tamper-proof features also limits their use in some public places (such as hotels and rental properties), as they cannot effectively prevent vandalism. Summary of the Invention

[0012] In view of the problems existing in the prior art, this utility model provides an ultra-miniature smoke detector alarm.

[0013] To achieve the above objectives, the technical solution of this utility model is as follows:

[0014] This utility model provides an ultra-small smoke detector alarm, including: a middle shell, a front shell disposed above the middle shell, an insect-proof net disposed between the front shell and the middle shell, a top cover disposed on the front shell, a button disposed on the front shell, a buzzer module disposed on the top of the middle shell, a bottom shell disposed at the bottom of the middle shell, a power supply, a labyrinth disposed inside the middle shell, a PCB board mounted on the labyrinth, an anti-tamper switch, and a mounting plate mounted at the bottom of the bottom shell.

[0015] The PCB board includes a main control module, a smoke detection module, an infrared receiving module, an infrared transmitting module, a programmable module, and a temperature detection module; the corresponding terminals of the main control module are connected to the smoke detection module, infrared receiving module, infrared transmitting module, programmable module, and temperature detection module, respectively.

[0016] Electrical connections are made to the corresponding terminals of the power supply, tamper switch, and buzzer module.

[0017] Preferably, the main control module includes an MCU and its peripheral circuits, and an LED alarm indicator that is electrically connected to the corresponding end of the MCU. The model of the MCU is PY32L020F15P.

[0018] Preferably, the smoke detection module includes a smoke detection circuit, which includes a voltage regulator circuit and an operational amplifier circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are electrically connected to the corresponding terminals of the MCU.

[0019] Preferably, the voltage regulator circuit includes a voltage regulator chip SD5121-2.1V-SOT23 and its peripheral circuits; the corresponding terminal of the voltage regulator chip SD5121-2.1V-SOT23 is electrically connected to the corresponding terminal of the operational amplifier circuit.

[0020] Preferably, the operational amplifier circuit includes resistors R12, R13, R14, R20, R15, R16, R17, R18, R19, R22, R25, R29, RT2, amplifier U1B, amplifier U1A, capacitors C4, C2, C5, C6, C7, C8, C9, C15, C33, LED PD, and diode D3; pin 2 of the voltage regulator chip SD5121-2.1V-SOT23 is connected to resistor R 13 is electrically connected to the first terminals of resistors R17 and R20 respectively. The second terminal of resistor R17 is electrically connected to the first terminals of capacitors C33 and C6, the first terminal of LED PD, and the non-inverting input terminal of amplifier U1A respectively. The second terminal of LED PD is electrically connected to the first terminals of capacitors C8 and C6, and the first terminal of resistor R29 respectively. The second terminal of resistor R29 is electrically connected to the first terminal of capacitor C9. The second terminals of capacitors C8, C9, and R20 are all grounded. The capacitor C33... The second terminal is electrically connected to the inverting input terminal of amplifier U1A, the first terminal of resistor RT2, the first terminal of resistor R15, the first terminal of resistor R12, the first terminal of resistor R14, and the first terminal of capacitor C2. The second terminal of resistor R15 is electrically connected to the second terminal of resistor RT2 and the first terminal of capacitor C5. The second terminal of capacitor C5 is grounded. The second terminal of capacitor C2 is electrically connected to the second terminal of resistor R12, the output terminal of amplifier U1A, the first terminal of resistor R19, and the non-inverting input terminal of amplifier U1B. The second terminal of resistor R14 is electrically connected to resistor R... The first terminal of resistor R16, the first terminal of capacitor C4, the first terminal of diode D3, and the output terminal of amplifier U1B are electrically connected; the second terminal of resistor R16 is electrically connected to the second terminal of capacitor C4, the inverting input terminal of U1B, and the first terminal of resistor R18; the second terminal of resistor R18 is grounded through capacitor C7, and the second terminals of resistor R19 are all grounded; the second terminal of diode D3 is electrically connected to the first terminal of capacitor C15 and the first terminal of resistor R22; the second terminal of capacitor C15 is electrically connected to the second terminal of resistor R22 and the corresponding terminal of MCU through resistor R25.

[0021] Preferably, the temperature detection module includes a temperature detection circuit, which includes a resistor R2 and a thermistor; the resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, and the second terminal of the thermistor is grounded.

[0022] Preferably, the buzzer module includes a buzzer circuit, which includes a resistor R10, a resistor R11, a transistor Q2, a diode D1, an inductor L1, and a buzzer BZ1. The first end of the resistor R10 is electrically connected to the corresponding end of the MCU. The second end of the resistor R10 is electrically connected to the first end of the resistor R11 and the base of the transistor Q2. The emitter of the transistor Q2 is electrically connected to the first end of the inductor L1, the collector of the transistor Q2, and the first pin of the buzzer BZ1 via the diode D1. The second end of the inductor L1 is electrically connected to the second pin of the buzzer BZ1.

[0023] The technical solution of this utility model has the following beneficial effects:

[0024] This utility model adopts an ultra-compact design, significantly reducing its overall size. When installed indoors, it will not occupy too much space, making it particularly suitable for spaces with limited capacity, such as small apartments and narrow corridors. The miniaturized design allows the alarm to be flexibly installed in various locations, such as ceilings, walls, and furniture surfaces, improving installation flexibility and aesthetics.

[0025] Temperature detection-assisted judgment: A temperature detection module has been added to monitor the ambient temperature in real time. When the temperature rises abnormally, a comprehensive judgment is made in conjunction with the smoke concentration signal, effectively avoiding false alarms and missed alarms.

[0026] Infrared communication function: Equipped with an infrared receiving module and an infrared transmitting module, it supports remote control and alarm linkage functions. Users can operate the alarm via remote control, such as testing alarm functions, adjusting sensitivity, and resetting, making operation more convenient. The infrared transmitting module can communicate and link with other devices (such as other smoke detectors, smart home systems, etc.) to achieve multi-device coordinated alarm, improving the comprehensiveness and timeliness of fire early warning.

[0027] Smoke detection module optimization: The smoke detection module adopts an advanced smoke detection circuit, including a voltage regulator circuit and an operational amplifier circuit, which can amplify weak smoke signals and improve the sensitivity of smoke detection.

[0028] The smoke detection module, combined with a maze design, can guide smoke evenly into the detection area, avoiding false alarms or missed alarms caused by uneven smoke distribution, and ensuring that the alarm can issue a timely warning in the early stages of a fire.

[0029] Insect-proof mesh design: An insect-proof mesh is installed between the front and middle shells to effectively prevent insects from entering the smoke detection module, avoiding false alarms caused by insect interference, and improving the stability and reliability of the alarm. The insect-proof mesh design not only improves the operational stability of the smoke detection module but also extends the lifespan of the alarm and reduces maintenance costs.

[0030] Anti-tamper function: The alarm is equipped with an anti-tamper switch, which is a normally closed contact. When someone attempts to disassemble the alarm, the anti-tamper switch will trigger an alarm signal. The main control module will then trigger the buzzer to sound an alarm and send an alarm signal to other devices via the infrared transmitter module. This anti-tamper function effectively prevents users from disassembling the alarm, avoiding equipment damage or false alarms caused by disassembly. It also increases the security of the alarm and prevents malicious damage, making it particularly suitable for public places and commercial locations.

[0031] Stable power supply design: The alarm is equipped with a stable power supply module to ensure normal operation under various power conditions.

[0032] The alarm is equipped with buttons and an infrared receiver module. Users can operate the alarm via buttons or a remote control, such as testing the alarm function, adjusting sensitivity, and resetting it, making operation simple and convenient. The infrared communication function allows users to operate the alarm from a certain distance, avoiding the inconvenience of direct contact and improving the user experience.

[0033] Clear alarm sound: The buzzer module uses a high-decibel buzzer that can emit a clear and loud alarm sound, ensuring that users can be alerted in a timely manner in various environments, thus playing an effective role in fire early warning.

[0034] The alarm sound is designed with the needs of different environments in mind, ensuring that the alarm sound can penetrate obstacles such as walls and doors, and promptly remind users to take action. Attached Figure Description

[0035] Figure 1 is a schematic diagram of the structure of this utility model;

[0036] Figure 2 is a schematic diagram of the structure of this utility model;

[0037] Figure 3 is an exploded view of the structure of this utility model;

[0038] Figure 4 is a schematic diagram of the control module of this utility model;

[0039] Figure 5 is a circuit diagram of the main control module of this utility model;

[0040] Figure 6 is a circuit diagram of the smoke detection module of this utility model;

[0041] Figure 7 is a circuit diagram of the buzzer module of this utility model;

[0042] Figure 8 is a circuit diagram of the temperature detection module of this utility model;

[0043] Figure 9 is a circuit diagram of the infrared receiving module of this utility model;

[0044] Figure 10 is a circuit diagram of the infrared emitting module of this utility model;

[0045] Figure 11 is a circuit diagram of the programming port module of this utility model;

[0046] Figure 12 is a circuit diagram of the power supply of this utility model. Detailed Implementation

[0047] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] Referring to Figures 1 to 12, this utility model provides an ultra-small smoke detector alarm, including: a middle shell 5, a front shell 2 disposed above the middle shell 5, an insect-proof net 4 disposed between the front shell 2 and the middle shell 5, a top cover 1 disposed on the front shell, a button 6 disposed on the front shell 2, a buzzer module 3 disposed on the top of the middle shell 5, a bottom shell 11 disposed at the bottom of the middle shell 5, a power supply 8 disposed inside the middle shell 5, a maze 7, a PCB board mounted on the maze 7, an anti-tamper switch 10, and a mounting plate 13 mounted at the bottom of the bottom shell 11;

[0053] Function of the middle shell 5: The middle shell 5 is the core supporting component of the entire smoke detector alarm, providing a foundation for the installation and fixation of other components. The internal space design of the middle shell is reasonable, capable of accommodating key components such as the power supply 8, PCB board, and labyrinth 7, ensuring a reasonable layout and stable installation of all components. Effect: Through the supporting and fixing function of the middle shell 5, the overall structural stability of the smoke detector alarm is guaranteed.

[0054] The insect-proof net 4, placed between the front shell 2 and the middle shell 5, primarily prevents insects from entering the smoke detector. Insects entering the interior may interfere with the normal operation of the smoke detection module, even causing false alarms. Effectively preventing insect interference with the smoke detection module improves the stability and accuracy of the smoke detector, reduces the possibility of false alarms, and ensures the reliability of the alarm during long-term use. The buzzer module 3's alarm function is one of the core functions of the smoke detector. By emitting a high-decibel alarm sound, it can promptly remind users to take measures to prevent the fire from escalating and protect the safety of people and property. The maze 7, installed inside the middle shell 5, primarily guides smoke into the detection area of ​​the smoke detection module. The design of the maze 7 ensures that smoke enters the detection area evenly, improving the accuracy and sensitivity of smoke detection. The tamper-proof switch 10 effectively prevents users from disassembling the alarm without authorization, avoiding damage or false alarms caused by disassembly, while also increasing the alarm's security and preventing malicious damage.

[0055] The PCB board is equipped with a main control module 20, a smoke detection module 21, an infrared receiving module 22, an infrared emitting module 23, a program programming port module 24, and a temperature detection module 25. The corresponding terminals of the main control module 20 are electrically connected to the corresponding terminals of the smoke detection module 21, the infrared receiving module 22, the infrared emitting module 23, the program programming port module 24, the temperature detection module 25, the power supply 8, the anti-tamper switch 10, and the buzzer module 3.

[0056] Furthermore, the main control module 20 includes an MCU and its peripheral circuits, and an LED alarm indicator electrically connected to the corresponding terminal of the MCU. The MCU model is PY32L020F15P. The main control module 20 is the core control unit of the smoke detector alarm, composed of the MCU and its peripheral circuits. It is responsible for receiving and processing signals from the smoke detection module 21, infrared receiving module 22, temperature detection module 25, etc., and controlling the working status of the buzzer module 3, infrared transmitting module 22, etc., according to the preset program. The main control module 20 also receives program instructions through the program programming port module 24 to realize the function upgrade and parameter adjustment of the alarm. The intelligent control of the main control module 20 enables the smoke detector alarm to realize multiple functions, such as smoke detection, alarm, temperature monitoring, infrared communication, etc. Through the coordinated control of the main control module, the modules can work together efficiently, improving the overall performance and reliability of the alarm.

[0057] Furthermore, the smoke detection module 21 includes a smoke detection circuit 210, which includes a voltage regulator circuit and an operational amplifier circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are electrically connected to the corresponding terminals of the MCU. The voltage regulator circuit includes a voltage regulator chip SD5121-2.1V-SOT23 and its peripheral circuits; the corresponding terminals of the voltage regulator chip SD5121-2.1V-SOT23 are electrically connected to the corresponding terminals of the operational amplifier circuit. The operational amplifier circuit includes resistors R12, R13, R14, R20, R15, R16, R17, R18, R19, R22, R25, R29, RT2, amplifiers U1B and U1A, capacitors C4, C2, C5, C6, C7, C8, C9, C15, C33, LED PD, and diode D3; pin 2 of the voltage regulator chip SD5121-2.1V-SOT23 is connected via resistor R13. The first terminal of resistor R17 and the first terminal of resistor R20 are electrically connected. The second terminal of resistor R17 is electrically connected to the first terminals of capacitor C33, capacitor C6, LED PD, and the non-inverting input terminal of amplifier U1A. The second terminal of LED PD is electrically connected to the first terminals of capacitor C8, capacitor C6, and resistor R29. The second terminal of resistor R29 is electrically connected to the first terminal of capacitor C9. The second terminals of capacitor C8, capacitor C9, and resistor R20 are all grounded. The second terminal of capacitor C33... The first terminal of resistor R15 is electrically connected to the inverting input terminal of amplifier U1A, the first terminal of resistor R12, the first terminal of resistor R15, the first terminal of resistor R12, the first terminal of resistor R14, and the first terminal of capacitor C2, respectively. The second terminal of resistor R15 is electrically connected to the second terminal of resistor R12 and the first terminal of capacitor C5, respectively. The second terminal of capacitor C5 is grounded. The second terminal of capacitor C2 is electrically connected to the second terminal of resistor R12, the output terminal of amplifier U1A, the first terminal of resistor R19, and the non-inverting input terminal of amplifier U1B, respectively. The second terminal of resistor R14 is electrically connected to the inverting input terminal of resistor R14 and the first terminal of capacitor C2, respectively. The first terminal of resistor R16, the first terminal of capacitor C4, the first terminal of diode D3, and the output terminal of amplifier U1B are electrically connected; the second terminal of resistor R16 is electrically connected to the second terminal of capacitor C4, the inverting input terminal of U1B, and the first terminal of resistor R18; the second terminal of resistor R18 is grounded through capacitor C7, and the second terminals of resistor R19 are all grounded; the second terminal of diode D3 is electrically connected to the first terminal of capacitor C15 and the first terminal of resistor R22; the second terminal of capacitor C15 is electrically connected to the second terminal of resistor R22 and the corresponding terminal of MCU through resistor R25.

[0058] In this embodiment, the smoke detection module 21 is a key functional module of the smoke detection alarm, used to detect the smoke concentration in the environment. It converts the smoke signal into an electrical signal through the smoke detection circuit and transmits it to the main control module for processing. The smoke detection circuit includes a voltage regulator circuit and an operational amplifier circuit. The voltage regulator circuit provides a stable voltage to the detection circuit, and the operational amplifier circuit amplifies the smoke signal to ensure that the signal can be accurately identified by the main control module. The smoke detection module 21 can quickly and accurately detect the smoke concentration in the environment. When the smoke concentration exceeds a preset threshold, it promptly sends a signal to the main control module 20, triggering an alarm. Its high sensitivity and high accuracy enable the alarm to issue a timely warning in the early stages of a fire, ensuring the safety of people and property.

[0059] Furthermore, the temperature detection module 25 includes a temperature detection circuit, which comprises a resistor R2 and a thermistor. The resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, while the second terminal of the thermistor is grounded. In this embodiment, the temperature detection module 25 is used to detect the ambient temperature. The temperature detection circuit converts the temperature signal into an electrical signal and transmits it to the main control module 20 for processing. The temperature detection circuit includes a resistor and a thermistor. The resistance of the thermistor changes with temperature, thereby achieving temperature detection. The temperature detection module 25 enables the smoke detector to simultaneously monitor the ambient temperature. When the temperature rises abnormally, it can help determine the possibility of a fire, improving the accuracy and reliability of the alarm.

[0060] Furthermore, the buzzer module 3 includes a buzzer circuit comprising resistors R10 and R11, transistor Q2, diode D1, inductor L1, and buzzer BZ1. The first terminal of resistor R10 is electrically connected to the corresponding terminal of the MCU. The second terminal of resistor R10 is electrically connected to the first terminal of resistor R11 and the base of transistor Q2. The emitter of transistor Q2 is electrically connected via diode D1 to the first terminal of inductor L1, the collector of transistor Q2, and the first pin of buzzer BZ1. The second terminal of inductor L1 is electrically connected to the second pin of buzzer BZ1. In this embodiment, the buzzer module 3 is used to emit an alarm sound. When the main control module 20 receives a smoke detection module 25, the buzzer module 3 will emit a high-decibel alarm sound to alert the user of a fire or other dangerous situation. By emitting a high-decibel alarm sound, the buzzer module 3 can promptly remind the user to take measures to prevent the fire from escalating and to ensure the safety of personnel and property.

[0061] The working principle of this utility model is as follows:

[0062] When power is turned on, the main control module 20 (MCU) initializes each module, including self-checking whether the smoke detection module 21, temperature detection module 25, and infrared receiver module 22 are working properly. The smoke detection module 21 continuously monitors the smoke concentration in the environment, the temperature detection module 25 monitors the ambient temperature, and the infrared receiver module 22 receives external commands (such as remote control operation). The main control module 20 receives signals from the smoke detection module 21 and the temperature detection module 25 to determine whether the smoke concentration exceeds a preset threshold, and also uses temperature changes to help determine the possibility of a fire. If the smoke concentration exceeds the threshold, the main control module 20 triggers the buzzer module 3 to emit a high-decibel alarm sound, and can send a linkage signal to other devices through the infrared transmitter module 23, while simultaneously controlling the alarm indicator LED to sound an alarm.

[0063] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An ultra-miniature smoke detector alarm, characterized in that, include: The system comprises a middle shell, a front shell positioned above the middle shell, an insect-proof mesh placed between the front shell and the middle shell, a top cover on the front shell, buttons on the front shell, a buzzer module on the top of the middle shell, a bottom shell at the bottom of the middle shell, a power supply, a maze, a PCB board mounted on the maze, an anti-tamper switch, and a mounting plate at the bottom of the bottom shell. The PCB board includes a main control module, a smoke detection module, an infrared receiving module, an infrared emitting module, a programming port module, and a temperature detection module. The corresponding terminals of the main control module are electrically connected to the corresponding terminals of the smoke detection module, infrared receiving module, infrared emitting module, programming port module, temperature detection module, power supply, anti-tamper switch, and buzzer module.

2. The ultra-miniature smoke detector alarm according to claim 1, characterized in that, The main control module includes an MCU and its peripheral circuits, and an LED alarm indicator that is electrically connected to the corresponding end of the MCU. The model of the MCU is PY32L020F15P.

3. The ultra-compact smoke detector alarm according to claim 2, characterized in that, The smoke detection module includes a smoke detection circuit, which includes a voltage regulator circuit and an operational amplifier circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are electrically connected to the corresponding terminals of the MCU.

4. The ultra-compact smoke detector alarm according to claim 3, characterized in that, The voltage regulator circuit includes a voltage regulator chip SD5121-2.1V-SOT23 and its peripheral circuits; the corresponding terminal of the voltage regulator chip SD5121-2.1V-SOT23 is electrically connected to the corresponding terminal of the operational amplifier circuit.

5. The ultra-miniature smoke detector alarm according to claim 4, characterized in that, The operational amplifier circuit includes resistors R12, R13, R14, R20, R15, R16, R17, R18, R19, R22, R25, R29, RT2, amplifiers U1B and U1A, capacitors C4, C2, C5, C6, C7, C8, C9, C15, C33, LED PD, and diode D3; pin 2 of the voltage regulator chip SD5121-2.1V-SOT23 is connected via resistor R13. The first terminal of resistor R17 and the first terminal of resistor R20 are electrically connected. The second terminal of resistor R17 is electrically connected to the first terminals of capacitor C33, capacitor C6, LED PD, and the non-inverting input terminal of amplifier U1A. The second terminal of LED PD is electrically connected to the first terminals of capacitor C8, capacitor C6, and resistor R29. The second terminal of resistor R29 is electrically connected to the first terminal of capacitor C9. The second terminals of capacitor C8, capacitor C9, and resistor R20 are all grounded. The second terminal of capacitor C33... The first terminal of resistor R15 is electrically connected to the inverting input terminal of amplifier U1A, the first terminal of resistor R12, the first terminal of resistor R15, the first terminal of resistor R12, the first terminal of resistor R14, and the first terminal of capacitor C2, respectively. The second terminal of resistor R15 is electrically connected to the second terminal of resistor R12 and the first terminal of capacitor C5, respectively. The second terminal of capacitor C5 is grounded. The second terminal of capacitor C2 is electrically connected to the second terminal of resistor R12, the output terminal of amplifier U1A, the first terminal of resistor R19, and the non-inverting input terminal of amplifier U1B, respectively. The second terminal of resistor R14 is electrically connected to the inverting input terminal of resistor R14 and the first terminal of capacitor C2, respectively. The first terminal of resistor R16, the first terminal of capacitor C4, the first terminal of diode D3, and the output terminal of amplifier U1B are electrically connected; the second terminal of resistor R16 is electrically connected to the second terminal of capacitor C4, the inverting input terminal of U1B, and the first terminal of resistor R18; the second terminal of resistor R18 is grounded through capacitor C7, and the second terminals of resistor R19 are all grounded; the second terminal of diode D3 is electrically connected to the first terminal of capacitor C15 and the first terminal of resistor R22; the second terminal of capacitor C15 is electrically connected to the second terminal of resistor R22 and the corresponding terminal of MCU through resistor R25.

6. The ultra-miniature smoke detector alarm according to claim 5, characterized in that, The temperature detection module includes a temperature detection circuit, which includes a resistor R2 and a thermistor. The resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, and the second terminal of the thermistor is grounded.

7. The ultra-miniature smoke detector alarm according to claim 6, characterized in that, The buzzer module includes a buzzer circuit comprising a resistor R10, a resistor R11, a transistor Q2, a diode D1, an inductor L1, and a buzzer BZ1. The first end of the resistor R10 is electrically connected to the corresponding end of the MCU. The second end of the resistor R10 is electrically connected to the first end of the resistor R11 and the base of the transistor Q2. The emitter of the transistor Q2 is electrically connected via the diode D1 to the first end of the inductor L1, the collector of the transistor Q2, and the first pin of the buzzer BZ1. The second end of the inductor L1 is electrically connected to the second pin of the buzzer BZ1.

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