Independent temperature-sensing fire detection alarm

Abstract

The utility model discloses an independent temperature sensing fire detection alarm. Comprising a face shell, a bottom shell connected with the face shell in a threaded mode, a middle shell connected with the bottom shell in a buckled mode, a battery arranged on the middle shell, a PCB assembly arranged between the face shell and the bottom shell, a top shell and keys arranged on the face shell, a PCB arranged between the middle shell and the face shell, and a positive plate arranged on one side of the PCB, the negative plate is arranged on the other side of the PCB; the top shell is arranged at the top of the surface shell; the PCB is provided with a main control circuit, an NB module circuit, a sound output circuit, an indicating lamp circuit, a module firmware downloading circuit, an NB power supply control circuit, an SIM card circuit, a temperature detection circuit, a program downloading simulation circuit, an AT serial port circuit, an NB module reset wake-up enable circuit and an infrared transmitting and receiving circuit.

Description

Technical Field

[0001] This utility model relates to the field of alarm technology, and in particular to an independent temperature-sensing fire detection alarm. Background Technology

[0002] In the current field of building safety and fire prevention, fire detectors and alarms play a crucial role. However, with technological advancements and increasing demands for intelligent systems, traditional fire detectors and alarms have gradually revealed limitations, such as a lack of remote monitoring capabilities, low levels of intelligence, and inconvenient maintenance and updates. These issues restrict the effectiveness and scope of fire detectors and alarms in modern society.

[0003] The limitations of existing technologies mainly include:

[0004] Insufficient remote monitoring capabilities: Many existing fire detectors can only issue alarms on-site and cannot transmit alarm information to remote monitoring centers or user mobile devices in real time, resulting in prolonged fire response time.

[0005] Lack of temperature detection: Some alarms lack the ability to accurately monitor changes in ambient temperature, which reduces the accuracy of early fire detection.

[0006] Limited intelligence: Traditional alarms typically lack intelligent power management and firmware update mechanisms, which not only increases maintenance costs but also limits the device's functional expansion and performance optimization.

[0007] Maintenance and updates are inconvenient: Due to the lack of an effective firmware update mechanism, existing alarms often require on-site operation by professionals when encountering software defects or needing functional upgrades. This is not only costly but also affects the efficiency of equipment use.

[0008] Poor environmental adaptability: In some environments where wiring is difficult, such as old buildings and temporary sites, traditional wired alarms are difficult to install and use. Utility Model Content

[0009] To address the problems existing in the prior art, this utility model provides an independent temperature-sensing fire detection alarm.

[0010] To achieve the above objectives, the technical solution of this utility model is as follows:

[0011] This utility model provides an independent temperature-sensing fire detector and alarm, including: a front shell, a bottom shell connected to the front shell by threads, a middle shell connected to the bottom shell by snap-fit, a battery disposed on the middle shell, a PCB assembly disposed between the front shell and the bottom shell, a top shell and a button disposed on the front shell, a PCB board disposed between the middle shell and the front shell, a positive electrode plate disposed on one side of the PCB board, a negative electrode plate disposed on the other side of the PCB board, and a top shell disposed on the top of the front shell.

[0012] The PCB board includes a main control circuit, an NB module circuit, a sound output circuit, an indicator light circuit, a module firmware download circuit, a SIM card circuit, a temperature detection circuit, a program download simulation circuit, an AT serial port circuit, an NB module reset and wake-up enable circuit, an NB power control circuit, and an infrared transmitting and receiving circuit. The corresponding terminals of the main control circuit are electrically connected to the corresponding terminals of the sound output circuit, indicator light circuit, NB power control circuit, temperature detection circuit, program download simulation circuit, AT serial port circuit, NB module reset and wake-up enable circuit, NB power control circuit, buttons, battery, and infrared transmitting and receiving circuit. The corresponding terminals of the NB module circuit are electrically connected to the corresponding terminals of the AT serial port circuit, NB module reset and wake-up enable circuit, NB power control circuit, SIM card circuit, and module firmware download circuit.

[0013] Preferably, the main control circuit includes an MCU and its peripheral circuits, wherein the MCU is model CS2109BGO; the NB module circuit includes an NB communication chip MN316 and its peripheral circuits.

[0014] Preferably, the sound output circuit includes resistor R6, resistor R7, transistor Q2, diode D1, inductor L1, and buzzer BZ1; the first end of resistor R6 is electrically connected to the corresponding end of the MCU, the second end of resistor R6 is connected to the first end of resistor R7 and the base of transistor Q2, the second end of resistor R7 is grounded, the emitter of transistor Q2 is electrically connected to the first end of diode D1 and grounded, the collector of transistor Q2 is electrically connected to buzzer BZ1, the second end of diode D1, and the first end of inductor L1; the second end of inductor L1 is electrically connected to the corresponding end of buzzer BZ1.

[0015] Preferably, the indicator circuit includes a reverse-mounted red LED and a resistor R3; the first end of the reverse-mounted red LED is electrically connected to the corresponding end of the MCU, and the second end of the reverse-mounted red LED is grounded through the resistor R3.

[0016] Preferably, the temperature detection circuit includes a resistor R5, a thermistor RT1, a thermistor RT2, a capacitor C13, a diode TVS2, and a diode TVS3; the first terminal of the thermistor RT1 is electrically connected to the MCU, the first terminal of the diode TVS3, and the first terminal of the thermistor RT2, respectively; the second terminal of the thermistor RT1 is electrically connected to the first terminal of the resistor R5, the first terminal of the capacitor C13, the first terminal of the diode TVS2, and the second terminal of the thermistor RT2, respectively; the second terminals of the diode TVS2, the second terminals of the diode TVS3, the second terminals of the resistor R5, and the second terminals of the capacitor C13 are grounded.

[0017] Preferably, the NB power control circuit includes resistors R12, R14, and R16, MOSFET V2, and MOSFET V3; the first end of resistor R12 is electrically connected to the corresponding end of the MCU, the second end of resistor R12 is electrically connected to the gate of MOSFET V2, the source of MOSFET V2 is grounded, the drain of MOSFET V2 is electrically connected to the first end of resistor R14 and the gate of MOSFET V3 via resistor R16, the source of MOSFET V3 is electrically connected to the second end of resistor R14, and the drain of MOSFET V3 is electrically connected to the NB communication chip MN316.

[0018] Preferably, the AT serial port circuit includes an AT serial port circuit one and an AT serial port circuit two electrically connected to the corresponding terminals of the AT serial port circuit one;

[0019] The first AT serial port circuit includes a transistor Q3, a resistor R8, and a resistor R9. The base of transistor Q3 is electrically connected to the first terminal of resistor R8, the emitter of transistor Q3 is electrically connected to the corresponding terminal of the MCU, and the collector of transistor Q3 is electrically connected to the NB communication chip MN316 and the first terminal of resistor R9. The second terminal of resistor R9 is electrically connected to the second terminal of resistor R8 and the corresponding terminal of the second AT serial port circuit.

[0020] The second AT serial port circuit includes a transistor Q4, a resistor R18, and a resistor R19. The base of the transistor Q4 is electrically connected to the second terminal of the resistor R9 via the resistor R18, the emitter is electrically connected to the corresponding terminal of the NB communication chip MN316, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R19. The second terminal of the resistor R19 is electrically connected to the corresponding terminal of the MCU.

[0021] Preferably, the NB module reset wake-up enable circuit includes resistor R1, resistor R13, and transistor Q5; the first end of resistor R1 is electrically connected to the corresponding end of the MCU, the second end of resistor R1 is electrically connected to the first end of resistor R13 and the base of transistor Q5, the emitter of transistor Q5 is electrically connected to the second end of resistor R13 and grounded, and the collector is electrically connected to the corresponding end of the NB communication chip MN316.

[0022] Preferably, the module firmware download circuit includes a connector J1, a resistor R15, a capacitor C2, a capacitor C3, and a diode TVS1; the connector J1 is electrically connected to the first end of the diode TVS1, the first end of the capacitor C3, and the first end of the resistor R15, respectively; the second end of the resistor R15 is electrically connected to the first end of the capacitor C2 and the corresponding end of the NB communication chip MN316, respectively; and the second ends of the capacitor C2, the capacitor C3, and the diode TVS1 are all grounded.

[0023] Preferably, the infrared transmitting and receiving circuit includes an infrared receiving tube and an infrared transmitting tube; the corresponding terminals of the infrared receiving tube and the infrared transmitting tube are electrically connected to the corresponding terminals of the MCU.

[0024] The technical solution of this utility model has the following beneficial effects:

[0025] Temperature detection: The temperature detection circuit can monitor changes in ambient temperature, thereby improving the accuracy of early fire detection.

[0026] Remote monitoring and alarm: Through NB-IoT communication technology, fire information can be transmitted remotely, allowing users to receive fire alarm information anytime and anywhere via mobile phones or other terminal devices, thus improving the speed of fire response.

[0027] Intelligent power management: The power management circuit controlled by MCU enables precise control of the NB communication chip, including power-on, power-off and wake-up, which effectively reduces power consumption and extends the service life of the device.

[0028] Remote firmware update: A module firmware download circuit was designed, which allows the firmware of the NB communication chip to be updated remotely through an external device, simplifying the maintenance and upgrade process of the device and reducing maintenance costs.

[0029] Integrated design: Integrating functions such as temperature monitoring, fire alarm, remote communication and power management into one device simplifies system design and reduces installation and operating costs.

[0030] Enhanced user experience: Intuitive user feedback is provided through indicator lights and sound output circuitry, enhancing the user experience.

[0031] Infrared transmitting and receiving circuit: Enables wireless communication with other devices through an infrared receiving tube and an infrared transmitting tube. The MCU controls the infrared transmitting tube to send infrared signals and simultaneously receives signals from the infrared receiving tube, realizing remote control or data reception. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure One ;

[0033] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure Two ;

[0034] Figure 3 This is an exploded view of the present invention;

[0035] Figure 4 This is a schematic diagram of the control system of this utility model;

[0036] Figure 5 This is a circuit diagram of the main control circuit of this utility model;

[0037] Figure 6 This is a circuit diagram of the indicator light circuit of this utility model;

[0038] Figure 7 This is a circuit diagram of the temperature detection circuit of this utility model;

[0039] Figure 8 The circuit diagram for the simulation circuit of this utility model is shown below.

[0040] Figure 9 This is a circuit diagram of the sound output circuit of this utility model;

[0041] Figure 10 This is the circuit diagram of the AT serial port circuit of this utility model;

[0042] Figure 11 The circuit diagram is for the NB module reset and wake-up enable circuit of this utility model.

[0043] Figure 12 This is a circuit diagram of the NB power control circuit of this utility model;

[0044] Figure 13 This is a circuit diagram of the SIM card circuit of this utility model;

[0045] Figure 14 This is a circuit diagram of the NB module circuit of this utility model. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In this utility model, unless otherwise expressly specified and limited, the first feature is "on" or "on" the second feature.

[0051] The term "below" can include situations where the first and second features are in direct contact, or situations where the first and second features are in contact through another feature between them. Furthermore, "above," "over," and "on top" of the first feature above the second feature includes situations where the first feature is 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" of the first feature below the second feature includes situations where the first feature is 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] Reference Figures 1 to 14 This utility model provides an independent temperature-sensing fire detector and alarm, comprising: a front shell 11, a bottom shell 2 connected to the front shell 11 by threads, a middle shell 4 connected to the bottom shell 2 by snap-fit, a battery 27 disposed on the middle shell 4, a PCB assembly 7 disposed between the front shell 11 and the bottom shell 2, a top shell 12 and a button 10 disposed on the front shell 11, a PCB board 7 disposed between the middle shell 4 and the front shell 11, a positive electrode 6 disposed on one side of the PCB board 7, a negative electrode 8 disposed on the other side of the PCB board, and a top shell 12 disposed on the top of the front shell 11; after the bottom shell 2 and the middle shell 4 are engaged, they can be detachably fixed by screws 1; the front shell 11 and the bottom shell 2 are connected by threads, and the middle shell 4 and the bottom shell 2 are connected by snap-fit, making disassembly and assembly convenient;

[0053] The PCB board 7 is equipped with a main control circuit 20, an NB module circuit 32, a sound output circuit 24, an indicator light circuit 21, a module firmware download circuit 33, an NB power control circuit 30, a SIM card circuit 31, a temperature detection circuit 22, a program download simulation circuit 23, an AT serial port circuit 28, an NB module reset wake-up enable circuit 29, and an infrared transmitting and receiving circuit 25. The corresponding terminals of the main control circuit 20 are electrically connected to the corresponding terminals of the sound output circuit 24, the indicator light circuit 21, the NB power control circuit 30, the temperature detection circuit 22, the program download simulation circuit 33, the AT serial port circuit 28, the NB module reset wake-up enable circuit 29, the NB power control circuit 30, the button 10, the battery 27, and the infrared transmitting and receiving circuit 25. The corresponding terminals of the NB module circuit 32 are electrically connected to the corresponding terminals of the AT serial port circuit 28, the NB module reset wake-up enable circuit 29, the NB power control circuit 30, the SIM card circuit 31, and the module firmware download circuit 33.

[0054] Furthermore, the main control circuit 20 includes an MCU and its peripheral circuits, the MCU being model CS2109BGO; the NB module circuit includes an NB communication chip MN316 and its peripheral circuits. The infrared transmitting and receiving circuit 25 includes an infrared receiver and an infrared transmitter; the corresponding terminals of the infrared receiver and transmitter are electrically connected to the corresponding terminals of the MCU. In this embodiment, the MCU receives signals from the temperature detection circuit and determines whether an alarm needs to be triggered based on preset conditions. It controls the sound output circuit and indicator light circuit to send alarm signals to the user. It manages the NB module circuit to achieve remote data transmission and communication. Through the infrared transmitting and receiving circuit, wireless communication with other devices is achieved; the infrared transmitting and receiving circuit 25 includes an infrared receiver and an infrared transmitter to achieve infrared communication functionality. It is used to receive signals from a remote control or other infrared control devices to achieve remote control. It sends infrared signals to control other devices or to transmit data. This improves the control flexibility of the alarm, allowing users to remotely operate the alarm via an infrared remote control. It enhances the interactive capabilities of the alarm, enabling it to work collaboratively with other devices that support infrared communication.

[0055] Furthermore, the sound output circuit 24 includes resistors R6 and R7, transistor Q2, diode D1, inductor L1, and buzzer BZ1. The first terminal of resistor R6 is electrically connected to the corresponding terminal of the MCU. The second terminal of resistor R6 is connected to the first terminal of resistor R7 and the base of transistor Q2. The second terminal of resistor R7 is grounded. The emitter of transistor Q2 is electrically connected to and grounded to the first terminal of diode D1. The collector of transistor Q2 is electrically connected to buzzer BZ1, the second terminal of diode D1, and the first terminal of inductor L1. The second terminal of inductor L1 is electrically connected to the corresponding terminal of buzzer BZ1. In the event of a fire or other emergency, the sound output circuit 24 emits a loud alarm to alert people and prompt them to take action.

[0056] Furthermore, the indicator light circuit 21 includes a reverse-mounted red LED and a resistor R3; the first end of the reverse-mounted red LED is electrically connected to the corresponding end of the MCU, and the second end of the reverse-mounted red LED is grounded through the resistor R3; when a fire is detected or a preset temperature threshold is reached, the indicator light can flash or remain on to warn the user.

[0057] Furthermore, the temperature detection circuit 22 includes a resistor R5, a thermistor RT1, a thermistor RT2, a capacitor C13, a diode TVS2, and a diode TVS3. The first terminal of the thermistor RT1 is electrically connected to the MCU, the first terminal of the diode TVS2, and the first terminal of the thermistor RT2. The second terminal of the thermistor RT1 is electrically connected to the first terminal of the resistor R5, the first terminal of the capacitor C13, the first terminal of the diode TVS2, and the second terminal of the thermistor RT2. The second terminals of the diode TVS3, the second terminal of the resistor R5, and the second terminal of the capacitor C13 are grounded. The resistance values ​​of thermistors RT1 and RT2 change with temperature, affecting the voltage passing through them. When the temperature rises, the resistance of the thermistors decreases, resulting in a decrease in the voltage passing through them, thereby generating a temperature-related voltage signal at the input of the MCU. It monitors the ambient temperature and triggers an alarm when the temperature exceeds a preset threshold. It provides temperature change data for fire prevention and environmental monitoring.

[0058] Furthermore, the NB power control circuit 30 includes resistors R12, R14, and R16, MOSFET V2, and MOSFET V3; the first end of resistor R12 is electrically connected to the corresponding end of the MCU, the second end of resistor R12 is electrically connected to the gate of MOSFET V2, the source of MOSFET V2 is grounded, the drain of MOSFET V2 is electrically connected to the first end of resistor R14 and the gate of MOSFET V3 via resistor R16, the source of MOSFET V3 is electrically connected to the second end of resistor R14, and the drain of MOSFET V3 is electrically connected to the NB communication chip MN316.

[0059] The MCU provides a control signal to the gate of MOSFET V2 via resistor R12. When the MCU outputs a high level, V2 turns on. After V2 turns on, its drain voltage drops, providing voltage to the gate of MOSFET V3 through resistor R16, thus turning on V3. After V3 turns on, a path is formed between its drain and source, providing power to the NB communication chip MN316. MCU control enables flexible control of the NB communication module, such as turning it on, off, or into sleep mode. This improves power management efficiency and ensures stable operation of the NB communication chip when needed.

[0060] Furthermore, the AT serial port circuit 28 includes AT serial port circuit one and AT serial port circuit two electrically connected to the corresponding terminals of AT serial port circuit one.

[0061] The first AT serial port circuit includes a transistor Q3, a resistor R8, and a resistor R9. The base of transistor Q3 is electrically connected to the first terminal of resistor R8, the emitter of transistor Q3 is electrically connected to the corresponding terminal of the MCU, and the collector of transistor Q3 is electrically connected to the NB communication chip MN316 and the first terminal of resistor R9. The second terminal of resistor R9 is electrically connected to the second terminal of resistor R8 and the corresponding terminal of the second AT serial port circuit.

[0062] The second AT serial port circuit includes a transistor Q4, a resistor R18, and a resistor R19. The base of the transistor Q4 is electrically connected to the second terminal of the resistor R9 via the resistor R18, the emitter is electrically connected to the corresponding terminal of the NB communication chip MN316, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R19. The second terminal of the resistor R19 is electrically connected to the corresponding terminal of the MCU.

[0063] AT serial port circuit 1: The base of transistor Q3 receives control signals from the MCU through resistor R8.

[0064] When the MCU needs to send data, it provides current to the base of Q3 through resistor R8, turning on Q3.

[0065] When Q3 is turned on, a path is formed between its collector and emitter, allowing data to flow from the MCU to the NB communication chip MN316. Resistor R9 is used to limit the current flowing to the NB communication chip and may be used for signal voltage matching.

[0066] AT Serial Port Circuit Two: The base of transistor Q4 receives signals from the NB communication chip MN316 through resistor R18. When the NB communication chip MN316 needs to send data, it provides current to the base of Q4 through resistor R18, turning Q4 on. After Q4 is turned on, a path is formed between its collector and emitter, allowing data to flow from the NB communication chip to the MCU.

[0067] The AT serial port circuit 28 enables serial data communication between the MCU and the NB communication chip. It allows the alarm to exchange data with other devices via the serial port, such as configuring parameters and receiving control commands. This improves the reliability of data communication and ensures accurate data transmission between the MCU and the NB communication chip. Unidirectional signal transmission is achieved through the switching action of a transistor, preventing data collisions.

[0068] Furthermore, the NB module reset wake-up enable circuit 29 includes resistor R1, resistor R13, and transistor Q5; the first end of resistor R1 is electrically connected to the corresponding end of the MCU, the second end of resistor R1 is electrically connected to the first end of resistor R13 and the base of transistor Q5, the emitter of transistor Q5 is electrically connected to the second end of resistor R13 and grounded, and the collector is electrically connected to the corresponding end of the NB communication chip MN316.

[0069] The NB module reset and wake-up enable circuit 29 controls the reset and wake-up of the NB communication chip MN316, ensuring its normal operation when needed. Through MCU control, it enables flexible management of the NB communication module, such as reset, wake-up, or entry into low-power mode. This improves power management efficiency, ensuring the NB communication chip can quickly enter working state when needed. Precise control of reset and wake-up signals reduces unnecessary power consumption and extends battery life. It also improves circuit reliability, preventing chip damage or malfunction due to improper power management.

[0070] Furthermore, the module firmware download circuit 33 includes a connector J1, a resistor R15, capacitors C2 and C3, and a diode TVS1. Connector J1 is electrically connected to the first terminal of diode TVS1, the first terminal of capacitor C3, and the first terminal of resistor R15. The second terminal of resistor R15 is electrically connected to the first terminal of capacitor C2 and the corresponding terminal of the NB communication chip MN316. The second terminals of capacitors C2 and C3, and the second terminal of diode TVS1 are all grounded. The module firmware download circuit 33 not only enables firmware updates for the NB communication chip but also ensures the stability and reliability of the update process. This design allows the alarm to adapt to constantly changing technical and safety requirements, thereby improving its long-term operational reliability and functionality, and enabling firmware updates for the NB communication chip MN316 to fix vulnerabilities, improve performance, or add new functions.

[0071] The working principle of this utility model is as follows:

[0072] Temperature monitoring and alarm

[0073] Temperature detection circuit 22: It senses changes in ambient temperature through thermistors RT1 and RT2. When the temperature exceeds a preset threshold, the resistance value of the thermistors changes, causing a change in the voltage signal passing through them.

[0074] MCU20: Receives voltage signals from the temperature detection circuit and makes judgments based on preset temperature thresholds. If the detected temperature exceeds the threshold, the MCU will trigger an alarm signal.

[0075] Sound output circuit 24: After receiving the alarm signal from the MCU, it drives the buzzer BZ1 to emit a sound alarm by controlling the conduction and cutoff of transistor Q2.

[0076] Indicator Circuit 21: At the same time, the MCU also controls the reverse-mounted red LED in the indicator circuit to light up, providing a visual alarm.

[0077] 2. Remote communication

[0078] NB module circuit: Includes the MN316 NB communication chip, responsible for implementing narrowband Internet of Things (NB-IoT) communication functions. When the temperature exceeds the threshold, the MCU sends data to the NB communication chip via the AT serial port circuit 28 to achieve remote alarm.

[0079] 3. Power Management

[0080] NB power control circuit (30): Controls the power supply of the NB communication chip through MOSFETs V2 and V3. The MCU controls the conduction and cutoff of the MOSFETs as needed to achieve power management of the NB communication chip.

[0081] Module firmware download circuit (33): Receives firmware update signal from external programming device through connector J1, and downloads firmware to NB communication chip through diode TVS1, resistor R15, capacitor C2 and C3 for protection and filtering.

[0082] 4. Reset and Wake-up

[0083] NB module reset and wake-up enable circuit (29): The reset and wake-up signals of the NB communication chip are controlled by transistor Q5. The MCU controls the conduction and cutoff of Q5 through resistors R1 and R13 according to the working state requirements to realize the reset or wake-up of the NB communication chip.

[0084] 5. Infrared communication

[0085] Infrared transmitting and receiving circuit 25: Enables wireless communication with other devices through an infrared receiving tube and an infrared transmitting tube. The MCU controls the infrared transmitting tube to send infrared signals and simultaneously receives signals from the infrared receiving tube, realizing remote control or data reception.

[0086] 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. A stand-alone heat-sensing fire detector and alarm, characterized in that, include: The front shell, the bottom shell connected to the front shell by threads, the middle shell connected to the bottom shell by snap-fit, the battery set on the middle shell, the PCB assembly set between the front shell and the bottom shell, the top shell and button set on the front shell, the PCB board set between the middle shell and the front shell, the positive electrode plate set on one side of the PCB board, the negative electrode plate set on the other side of the PCB board, and the top shell set on the top of the front shell. The PCB board includes a main control circuit, an NB module circuit, a sound output circuit, an indicator light circuit, a module firmware download circuit, a SIM card circuit, a temperature detection circuit, a program download simulation circuit, an AT serial port circuit, an NB module reset and wake-up enable circuit, an NB power control circuit, and an infrared transmitting and receiving circuit. The corresponding terminals of the main control circuit are electrically connected to the corresponding terminals of the sound output circuit, indicator light circuit, NB power control circuit, temperature detection circuit, program download simulation circuit, AT serial port circuit, NB module reset and wake-up enable circuit, NB power control circuit, buttons, battery, and infrared transmitting and receiving circuit. The corresponding terminals of the NB module circuit are electrically connected to the corresponding terminals of the AT serial port circuit, NB module reset and wake-up enable circuit, NB power control circuit, SIM card circuit, and module firmware download circuit.

2. The stand-alone heat-sensing fire detector and alarm according to claim 1, characterized in that, The main control circuit includes an MCU and its peripheral circuits, the MCU being model CS2109BGO; the NB module circuit includes an NB communication chip MN316 and its peripheral circuits.

3. The stand-alone heat-sensing fire detector and alarm according to claim 2, characterized in that, The sound output circuit includes resistor R6, resistor R7, transistor Q2, diode D1, inductor L1, and buzzer BZ1. The first end of resistor R6 is electrically connected to the corresponding end of the MCU. The second end of resistor R6 is connected to the first end of resistor R7 and the base of transistor Q2. The second end of resistor R7 is grounded. The emitter of transistor Q2 is electrically connected to the first end of diode D1 and grounded. The collector of transistor Q2 is electrically connected to buzzer BZ1, the second end of diode D1, and the first end of inductor L1. The second end of inductor L1 is electrically connected to the corresponding end of buzzer BZ1.

4. The stand-alone heat-sensing fire detector and alarm according to claim 3, characterized in that, The indicator light circuit includes a reverse-mounted red LED and a resistor R3; the first end of the reverse-mounted red LED is electrically connected to the corresponding end of the MCU, and the second end of the reverse-mounted red LED is grounded through the resistor R3.

5. The stand-alone heat-sensing fire detector and alarm according to claim 4, characterized in that, The temperature detection circuit includes a resistor R5, a thermistor RT1, a thermistor RT2, a capacitor C13, a diode TVS2, and a diode TVS3. The first terminal of the thermistor RT1 is electrically connected to the MCU, the first terminal of the diode TVS3, and the first terminal of the thermistor RT2. The second terminal of the thermistor RT1 is electrically connected to the first terminal of the resistor R5, the first terminal of the capacitor C13, the first terminal of the diode TVS2, and the second terminal of the thermistor RT2. The second terminals of the diode TVS2, the second terminal of the diode TVS3, the second terminal of the resistor R5, and the second terminal of the capacitor C13 are grounded.

6. The stand-alone heat-sensing fire detector and alarm according to claim 5, characterized in that, The NB power control circuit includes resistors R12, R14, and R16, MOSFET V2, and MOSFET V3. The first end of resistor R12 is electrically connected to the corresponding end of the MCU, and the second end of resistor R12 is electrically connected to the gate of MOSFET V2. The source of MOSFET V2 is grounded. The drain of MOSFET V2 is electrically connected to the first end of resistor R14 and the gate of MOSFET V3 via resistor R16. The source of MOSFET V3 is electrically connected to the second end of resistor R14, and the drain of MOSFET V3 is electrically connected to the NB communication chip MN316.

7. The stand-alone heat-sensing fire detector and alarm according to claim 6, characterized in that, The AT serial port circuit includes AT serial port circuit one and AT serial port circuit two, which are electrically connected to the corresponding terminals of AT serial port circuit one. The first AT serial port circuit includes a transistor Q3, a resistor R8, and a resistor R9. The base of transistor Q3 is electrically connected to the first terminal of resistor R8, the emitter of transistor Q3 is electrically connected to the corresponding terminal of the MCU, and the collector of transistor Q3 is electrically connected to the NB communication chip MN316 and the first terminal of resistor R9. The second terminal of resistor R9 is electrically connected to the second terminal of resistor R8 and the corresponding terminal of the second AT serial port circuit. The second AT serial port circuit includes a transistor Q4, a resistor R18, and a resistor R19. The base of the transistor Q4 is electrically connected to the second terminal of the resistor R9 via the resistor R18, the emitter is electrically connected to the corresponding terminal of the NB communication chip MN316, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R19. The second terminal of the resistor R19 is electrically connected to the corresponding terminal of the MCU.

8. The stand-alone heat-sensing fire detector and alarm according to claim 7, characterized in that, The NB module reset wake-up enable circuit includes resistor R1, resistor R13, and transistor Q5. The first end of resistor R1 is electrically connected to the corresponding end of the MCU. The second end of resistor R1 is electrically connected to the first end of resistor R13 and the base of transistor Q5. The emitter of transistor Q5 is electrically connected to the second end of resistor R13 and grounded. The collector is electrically connected to the corresponding end of the NB communication chip MN316.

9. The stand-alone heat-sensing fire detector and alarm according to claim 8, characterized in that, The module firmware download circuit includes connector J1, resistor R15, capacitor C2, capacitor C3, and diode TVS1. Connector J1 is electrically connected to the first terminal of diode TVS1, the first terminal of capacitor C3, and the first terminal of resistor R15. The second terminal of resistor R15 is electrically connected to the first terminal of capacitor C2 and the corresponding terminal of NB communication chip MN316. The second terminals of capacitor C2, capacitor C3, and diode TVS1 are all grounded.

10. The stand-alone heat-sensing fire detector and alarm according to claim 9, characterized in that, The infrared transmitting and receiving circuit includes an infrared receiving tube and an infrared transmitting tube; the corresponding terminals of the infrared receiving tube and the infrared transmitting tube are electrically connected to the corresponding terminals of the MCU.

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