Intelligent combustible gas detector

Abstract

The utility model discloses an intelligent combustible gas detector, including AC DC module, data processing module, sensor module, human body detection module and communication module. AC DC module connects commercial power and is powered for each module, and it adopts input protection and two -stage voltage stabilizing topology, directly outputs 5V and 3.3V voltage, does not need additional voltage stabilizing element, has reduced circuit complexity and cost. Data processing module is responsible for each module signal processing. Human body detection module monitors personnel existence, and sensor module detects combustible gas, and the combination of both improves reliability. The system integrates concentration, gas volume and human body state three -dimensional information, and the signal is transmitted in parallel on the hardware level, without software delay, which can realize the composite early warning of gas volume anomaly and concentration overproof under the unmanned state, and significantly reduce the misjudgment rate. The communication module is designed through impedance matching resistance, multi-node filtering and feedback circuit, which effectively reduces the communication packet loss rate and supports the hardware compatibility of Bluetooth, star flash and USB Type-C interface.

Description

Technical Field

[0001] This utility model belongs to the field of gas safety equipment technology, specifically an intelligent combustible gas detector. Background Technology

[0002] With the acceleration of urbanization and the popularization of natural gas energy, the demand for gas safety protection has upgraded from simple leak alarms to precise early warning and linkage control. However, the current mainstream combustible gas detectors still have multi-dimensional defects in circuit design, making it difficult to meet the needs of practical applications.

[0003] Firstly, the power supply circuit design lacks adaptability. Traditional detectors mostly use a single-path linear voltage regulator circuit, which only outputs a single voltage. However, in the core module of the detector, the combustible gas sensor requires a 5V operating voltage, the data processing chip requires a stable 3.3V power supply, and the human body detection module (including infrared human body sensing and millimeter-wave radar human body sensing) often requires 5V drive. This means that traditional power supply circuits need to add an independent voltage regulator module, which not only increases the circuit size and hardware cost, but also introduces noise interference due to the independent power supply paths of multiple modules, reducing the stability of the detection signal and seriously affecting the reliability of the equipment.

[0004] Secondly, the detection circuits are functionally limited and lack hardware integration. Most existing detectors only integrate a single combustible gas detection circuit, failing to integrate gas concentration detection with gas consumption monitoring at the hardware level. For example, in some scenarios (such as when a user leaves and closes the main gas valve), if there is a minor leak in the pipeline, the gas concentration may not reach the alarm threshold, but there is still a record of continuous gas consumption. Traditional detectors, lacking gas consumption monitoring hardware, cannot detect this type of potential risk. At the same time, the human detection module and the gas detection circuit are mostly designed independently, and their signals need to be forwarded through the software layer to be linked (such as increasing the detection frequency when no one is present). This can easily lead to missed warning windows in sudden leak scenarios.

[0005] Third, the standardization of communication interface circuits is low. Traditional detectors mostly use simple serial port circuits for external communication, and no anti-interference hardware is designed for external devices such as gas meters. In addition, the interface types are not uniform, which increases the complexity of on-site installation and maintenance.

[0006] The aforementioned circuit-level defects result in traditional combustible gas detectors having problems such as low early warning accuracy, poor linkage reliability, and weak environmental adaptability, making it difficult to meet the current intelligent and high-reliability requirements of gas safety protection. Therefore, there is an urgent need for an integrated solution based on hardware circuit optimization. Utility Model Content

[0007] The purpose of this invention is to provide an intelligent combustible gas detector to solve the problems of low early warning accuracy, poor linkage reliability, and weak environmental adaptability of traditional combustible gas detectors mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] An intelligent combustible gas detector includes an AC-DC module, a data processing module, a sensor module, a human body detection module, and a communication module; wherein one end of the AC-DC module is connected to the mains power, and the other end of the AC-DC module is connected to the data processing module, the sensor module, the human body detection module, and the communication module respectively, for powering the data processing module, the sensor module, the human body detection module, and the communication module;

[0010] The data processing module is connected to the sensor module, the human body detection module, and the communication module respectively, and is used for signal processing of the data processing module, the sensor module, the human body detection module, and the communication module.

[0011] The human detection module is used for monitoring whether there are people or not, the sensor module is used to detect combustible gases, and the combination of the human detection module and the sensor module improves the reliability of the detector; the communication module is used for bidirectional data transmission of the data processing module.

[0012] According to the above technical solution, the AC-DC module includes an input protection circuit and a voltage conversion circuit; one end of the input protection circuit is connected to the mains power, and the other end of the input protection circuit is connected to the voltage conversion circuit, thereby protecting the subsequent circuits.

[0013] The input protection circuit includes connector J1, fuse F1, diode D1, capacitor C1, and capacitor C2. One end of connector J1 is connected to the mains power, and the other end of connector J1 is connected to one end of fuse F1. The other end of fuse F1 is connected to one end of diode D1. The other end of diode D1 is connected to the voltage conversion circuit, one end of capacitor C1, and one end of capacitor C2, respectively. The other ends of capacitor C1 and capacitor C2 are grounded.

[0014] According to the above technical solution, the voltage conversion circuit includes chip U1, capacitor C3 and capacitor C4; pin 1 of chip U1 is connected to the input protection circuit, pin 3 of chip U1 is connected to one end of capacitor C3 and capacitor C4 respectively, the other end of capacitor C3 and capacitor C4 is grounded, and pin 3 of chip U1 outputs a 5V power supply.

[0015] Pin 2 of chip U1 is grounded.

[0016] According to the above technical solution, the voltage conversion circuit also includes chip U2, capacitor C5, capacitor C6 and capacitor C7; wherein, pin 3 of chip U2 is connected to the 5V power supply and one end of capacitor C5, and the other end of capacitor C5 is grounded; pin 1 of chip U2 is grounded; pin 2 of chip U2 is connected to one end of capacitor C6 and capacitor C7, and the other ends of capacitor C6 and capacitor C7 are grounded.

[0017] Pin 2 of chip U2 outputs a 3.3V power supply.

[0018] According to the above technical solution, the sensor module includes a magnetic field sensor module and a combustible gas sensor module. The magnetic field sensor module is used to detect the amount of gas consumed, and the combustible gas sensor module is used to detect whether there is a combustible gas leak. By combining the magnetic field sensor module and the combustible gas sensor module, the reliability of detection is improved.

[0019] According to the above technical solution, the combustible gas sensor module includes sensor J2, resistor R4, resistor R1, and capacitor C8; wherein, pin 1 of sensor J2 is connected to one end of resistor R4, the other end of resistor R4 is connected to a 5V power supply, pin 2 of sensor J2 is grounded, and pin 3 of sensor J2 is connected to the data processing module, one end of resistor R1, and one end of capacitor C8; the other end of resistor R1 is connected to a 5V power supply, and the other end of capacitor C8 is grounded.

[0020] According to the above technical solution, the magnetic field sensor module includes sensor J4, resistor R3 and resistor R6; wherein pin 1 of sensor J4 is connected to one end of resistor R6, and the other end of resistor R6 is connected to a 3.3V power supply.

[0021] Pin 2 of sensor J4 is grounded; pin 3 of sensor J4 is connected to the data processing module.

[0022] According to the above technical solution, the human body detection module includes sensor J3, resistor R2 and resistor R5; pin 1 of sensor J3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to a 5V power supply; pin 2 of sensor J3 is grounded; pin 3 of sensor J3 is connected to the data processing module and one end of resistor R2 respectively.

[0023] The other end of resistor R2 is grounded.

[0024] According to the above technical solution, the data processing module includes chip U3 and resistor R7; pin 1 of chip U3 is connected to a 3.3V power supply, pin 2 of chip U3 is connected to the communication module and one end of resistor R7, and the other end of resistor R7 is connected to the 3.3V power supply; pin 17 of chip U3 is connected to pin 3 of sensor J2, pin 16 of chip U3 is connected to pin 3 of sensor J3, and pin 15 of chip U3 is connected to pin 3 of sensor J4.

[0025] Pins 8, 11, and 12 of chip U3 are all connected to the communication module; pin 9 of chip U3 is grounded.

[0026] According to the above technical solution, the communication module includes chip U4, USB module J5, capacitor C11, capacitor C12, capacitor C13, resistor R8, resistor R9, resistor R10, resistor R11 and fuse F2.

[0027] Pin 2 of chip U4 is connected to one end of resistor R8, the other end of resistor R8 is connected to pin 11 of chip U3, pin 3 of chip U4 is connected to one end of resistor R9, and the other end of resistor R9 is connected to pin 12 of chip U3.

[0028] Pin 4 of chip U4 is connected to one end of capacitor C11, and the other end of capacitor C11 is grounded; pin 5 of chip U4 is connected to one end of capacitor C12, and the other end of capacitor C12 is grounded; pin 6 of chip U4 is connected to one end of capacitor C13, and the other end of capacitor C13 is grounded; pin 13 of chip U4 is connected to one end of resistor R11, and the other end of resistor R11 is connected to pin 2 of chip U4; pin 14 of chip U4 is connected to one end of resistor R10, and the other end of resistor R10 is connected to pin 8 of chip U4; pin 16 of chip U4 is connected to a 5V power supply; pin 1 of chip U4 is grounded.

[0029] Pin 1 of USB module J5 is connected to one end of fuse F2, and the other end of fuse F2 is connected to a 5V power supply; pin 3 of USB module J5 is connected to pin 5 of chip U4, pin 2 of USB module J5 is connected to pin 6 of chip U4; pin 4 of USB module J5 is grounded.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention utilizes a two-stage voltage regulator topology with input protection to achieve precise 5V and 3.3V voltage outputs, adapting to the power supply requirements of different modules, avoiding the need for additional voltage regulator components, and reducing circuit complexity and cost. By integrating a three-dimensional detection circuit for combustible gas concentration, gas consumption, and human status, the detection signals are transmitted in parallel at the hardware level without software delay, enabling composite early warning of abnormal gas volume and concentration exceeding the standard in unmanned states, significantly reducing the false negative rate. The voltage division and filtering design of each detection circuit improves the signal-to-noise ratio of the sensor signals, significantly enhancing detection accuracy.

[0032] The impedance matching resistor, multi-node filter capacitor, and feedback circuit design of the communication module in this invention effectively reduce the packet loss rate when communicating with external devices, and supports hardware compatibility with both wireless (Bluetooth / StarFlash) and wired (USB Type-C) interfaces. Attached Figure Description

[0033] Figure 1 This is a circuit diagram of the input protection circuit of this utility model;

[0034] Figure 2 This is one of the circuit diagrams for the voltage conversion circuit of this utility model;

[0035] Figure 3 This is the second circuit diagram of the voltage conversion circuit of this utility model;

[0036] Figure 4 This is a circuit diagram of the data processing module of this utility model;

[0037] Figure 5 This is a circuit diagram of the combustible gas sensor module of this utility model;

[0038] Figure 6 This is the circuit diagram of the human body detection module of this utility model;

[0039] Figure 7 This is a circuit diagram of the magnetic field sensor module of this utility model;

[0040] Figure 8 This is one of the circuit diagrams for the communication module of this utility model;

[0041] Figure 9 This is the second circuit diagram of the communication module of this utility model;

[0042] Figure 10 This is a block diagram of the overall architecture of this utility model. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] Example 1

[0045] like Figure 10 As shown, the intelligent combustible gas detector of this utility model is based on hardware circuit integration. The overall architecture includes an AC-DC module, a data processing module, a sensor module, a human body detection module, and a communication module. Each module is directly connected to wires through fixed pins. The specific circuit design is as follows:

[0046] The AC-DC module, serving as the core of the entire detector's power supply, employs an input protection and two-stage voltage conversion topology to adapt to the power supply requirements of different modules: such as... Figure 1 As shown, the input protection circuit consists of connector J1, fuse F1, diode D1, and capacitors C1 and C2. The input terminal of connector J1 is connected to 220V AC mains, and the output terminal is connected in series with fuse F1 for overcurrent protection (it blows when the circuit current exceeds 1A). The output terminal of fuse F1 is connected to the anode of diode D1, and the cathode of diode D1 serves as the output terminal of the protection circuit, preventing damage to subsequent circuits caused by reverse polarity connection when the AC mains is connected. Capacitors C1 and C2 are connected in parallel between the cathode of diode D1 and ground. C1 is a 10μF electrolytic capacitor, and C2 is a 0.1μF ceramic capacitor. Together, they filter out low-frequency noise and high-frequency interference from the AC mains, ensuring a stable voltage input to the subsequent conversion circuit. In the voltage conversion circuit, as... Figure 2 As shown, the first-stage conversion circuit uses chip U1 as its core. Chip U1 is an LM7805 linear voltage regulator chip. Its pin 1 (input terminal) is connected to the output terminal of the input protection circuit, pin 2 (ground terminal) is directly grounded, and pin 3 (output terminal) outputs a 5V DC voltage. Capacitors C3 and C4 (both 0.1μF ceramic capacitors) are also connected in parallel at this output terminal to further filter out the ripple generated during the voltage regulation process. The 5V voltage mainly powers the combustible gas sensor, the human body detection module, and the communication module. Figure 3As shown, the second-stage conversion circuit is based on chip U2, which is an AMS1117-3.3 linear regulator chip. Its pin 3 (input terminal) is connected to the 5V voltage output from the first-stage conversion circuit, pin 1 (ground terminal) is grounded, and pin 2 (output terminal) outputs a 3.3V DC voltage. The output terminal is connected in parallel with capacitors C5 (10μF electrolytic capacitor), C6 and C7 (both 0.1μF ceramic capacitors) to form a high-low frequency composite filter structure. The 3.3V voltage mainly powers the data processing module and the magnetic field sensor. Through two-stage conversion, accurate voltage matching of different modules is achieved, avoiding the need for additional voltage regulator components.

[0047] The sensor module, as the core of the detection system, integrates the combustible gas detection circuit and the gas consumption monitoring circuit to achieve dual-dimensional hardware detection: such as Figure 5 As shown, the combustible gas detection circuit uses sensor J2 as its core. Sensor J2 is an MQ-4 methane sensor. Its pin 1 (power supply terminal) is connected to the 5V voltage output from the AC-DC module through resistor R4 (100Ω carbon film resistor). Resistor R4 is used to limit the sensor's operating current to prevent damage caused by excessive current. Pin 2 (ground terminal) of sensor J2 is directly grounded, and pin 3 (signal output terminal) serves as the core output path for the detection signal. It is also connected to the signal input terminal of the data processing module, one end of resistor R1 (10kΩ carbon film resistor), and one end of capacitor C8 (100nF ceramic capacitor). The other end of resistor R1 is connected to the 5V voltage, forming a voltage divider circuit to ensure that the amplitude of the sensor output signal is stable within the range of 0-3.3V (to meet the input requirements of the data processing module). The other end of capacitor C8 is grounded to filter out high-frequency noise in the signal and improve the accuracy of the detection signal. The gas consumption monitoring circuit uses sensor J4 as its core, as shown... Figure 7 As shown, sensor J4 uses a HAL49E Hall sensor. Its pin 1 (power supply) is connected to the 3.3V output of the AC-DC module through resistor R6 (100Ω carbon film resistor), pin 2 (grounding) is grounded, and pin 3 (signal output) is directly connected to the corresponding signal input of the data processing module. By detecting the change in the magnetic field of the valve or flow meter in the gas pipeline, the gas consumption data is indirectly obtained, realizing hardware coordination of concentration detection and consumption monitoring.

[0048] like Figure 6As shown, the human detection module is used to sense the presence of human beings within the detection area. Its circuit is centered around sensor J3, which is an HC-SR501 infrared human body sensor. Pin 1 (power supply) of sensor J3 is connected to 5V through resistor R5 (100Ω carbon film resistor), which serves as a current limiting protection. Pin 2 (ground) of sensor J3 is grounded, and pin 3 (signal output) is connected to both the signal input of the data processing module and one end of resistor R2 (10kΩ carbon film resistor). The other end of resistor R2 is grounded, forming a pull-down circuit to prevent the output signal from drifting when the sensor does not detect a human body, thus ensuring the stability of the presence / absence status signal. The detection signal of this module is input to the data processing module in parallel with the detection signal of the sensor module, achieving signal synchronization at the hardware level without the need for timing coordination at the software level.

[0049] like Figure 4 As shown, the data processing module serves as the core hub for signal interaction. Its circuit is based on chip U3, which is an ESP32-C3-WROOM-02. Pin 1 (power supply) is connected to the 3.3V output of the AC-DC module, and pin 9 (ground) is grounded to ensure stable operation. Pins 17, 16, and 15 of chip U3 are connected to pin 3 of combustible gas sensor J2, pin 3 of human body detection sensor J3, and pin 3 of magnetic field sensor J4, respectively, to receive three-dimensional detection signals. Each pin has a built-in Schmitt trigger to further suppress signal noise. Pin 2 of chip U3 is connected to the 3.3V voltage through resistor R7 (10kΩ carbon film resistor) to form a pull-up circuit to ensure the initial level of this pin is stable. Pins 8, 11, and 12 serve as signal output terminals, directly connected to the corresponding input terminals of the communication module, realizing the transmission of detection signals to the hardware level of the communication module without software protocol conversion delay.

[0050] like Figure 8 and Figure 9As shown, the communication module is used to achieve stable data interaction between the detector and external devices (such as IoT smart gas meters and monitoring platforms). Its circuit is based on chip U4 and USB module J5. Chip U4 is CH340C (supporting Starflash and NB-IoT). (Hardware adaptation for wireless communication modules such as OT) Its pin 2 is connected to pin 11 of data processing chip U3 through resistor R8 (1kΩ carbon film resistor), and pin 3 is connected to pin 12 of U3 through resistor R9 (1kΩ carbon film resistor). Resistors R8 and R9 are used to achieve signal impedance matching and avoid reflection during high-frequency signal transmission. Pins 4, 5, and 6 of chip U4 are grounded through capacitors C11 (100nF), C12, and C13 (all 15pF ceramic capacitors) to form a multi-node filtering structure to suppress electromagnetic interference during communication. Pin 13 of chip U4 is connected to its own pin 2 through resistor R11 (1kΩ carbon film resistor), and pin 14 is connected to its own pin 8 through resistor R10 (1kΩ carbon film resistor) to form a feedback circuit to stabilize the communication baud rate of the module. Pin 16 of chip U4 is connected to 5V voltage, and pin 1 is grounded to ensure stable power supply to the module. The USB module J5 uses a USB Type-C interface. Its pin 1 is connected to 5V via fuse F2 (0.5A / 250V fast-blow fuse) to prevent overcurrent damage during USB interface plugging and unplugging. Pins 3 and 2 of J5 are connected to pins 5 and 6 of chip U4, respectively, and pin 4 is grounded, forming a standardized wired communication interface that can directly interface with the corresponding interface of IoT smart gas meters. It also supports hardware compatibility for both wireless and wired communication, improving the device's adaptability to different scenarios.

[0051] Example 2

[0052] This embodiment is a further refinement of Embodiment 1. This embodiment provides a specific implementation method for component selection, with the specific selection as follows:

[0053] In the AC-DC module, chip U1 is an LM7805 linear regulator (output current 1A, voltage drop 2V), and chip U2 is an AMS1117-3.3 linear regulator (output current 1A, voltage drop 1.2V); fuse F1 is a 1A / 250V fast-blow fuse, and F2 is a 0.5A / 250V fast-blow fuse; diode D1 is a 1N4007 rectifier diode (reverse withstand voltage 1000V, forward current 1A); capacitors C1 and C5 are 10μF / 25V electrolytic capacitors, and capacitors C2, C3, C4, C6, C7, C8, C11, C12, and C13 are 0.1μF / 50V ceramic capacitors. In the sensor module, the combustible gas sensor J2 is an MQ-4 methane sensor (detection range 0–10000ppm, operating voltage 5V), the magnetic field sensor J4 is a HAL49E Hall sensor (response time 1μs, operating voltage 3.3V), and the human body detection sensor J3 is an HC-SR501 infrared human body sensor (detection distance 3–7m, operating voltage 5V). In the data processing module, chip U3 is an ESP32-C3-WROOM-02. In the communication module, chip U4 is a CH340C, and the USB module J5 is a USB Type-C female connector (supporting USB 2.0 protocol); resistors R4, R5, and R6 are all 100Ω (current limiting resistors), and resistors R8, R9, R10, and R11 are all 1kΩ (communication matching resistors).

[0054] Resistors R1, R2, R3, and R7 are all 10kΩ / 0.25W carbon film resistors.

[0055] The circuit setup process follows the sequence of "power supply → detection → data processing → communication": First, build the AC-DC module. Connect the input terminal of connector J1 to a 220V AC outlet. Connect the output terminal in series with F1 and D1. Connect the cathode of D1 in parallel with C1 and C2 and then connect it to pin 1 of U1. Ground pin 2 of U1. Connect pin 3 in parallel with C3 and C4 to serve as a 5V output terminal. Connect pin 3 of U1 to pin 3 of U2. Ground pin 1 of U2. Connect pin 2 in parallel with C5, C6 and C7 to serve as a 3.3V output terminal. Next, the sensor module and the human detection module are built. Pin 1 of J2 is connected to the 5V output terminal via R4, pin 2 is grounded, and pin 3 is connected to the 5V output terminal via R1, grounded via C8, and then connected to pin 17 of U3. Pin 1 of J4 is connected to the 3.3V output terminal via R6, pin 2 is grounded, and pin 3 is connected to pin 15 of U3. Pin 1 of J3 is connected to the 5V output terminal via R5, pin 2 is grounded, and pin 3 is grounded via R2 and then connected to pin 16 of U3. Then, the data processing module is built. Pin 1 of U3 is connected to the 3.3V output terminal, pin 9 is grounded, pin 2 is connected to the 3.3V output terminal via R7, and pins 8, 11, and 12 are led out to the communication module. Finally, the communication module is built. Pin 2 of U4 is connected to pin 11 of U3 via R8, pin 3 is connected to pin 12 of U3 via R9, pins 4, 5, and 6 are grounded via C11, C12, and C13 respectively, pin 13 is connected to its own pin 2 via R11, pin 14 is connected to its own pin 8 via R10, pin 16 is connected to the 5V output terminal, and pin 1 is grounded; pin 1 of J5 is connected to the 5V output terminal via F2, pins 3 and 2 are connected to pins 5 and 6 of U4 respectively, and pin 4 is grounded.

[0056] The working principle of this utility model is as follows:

[0057] After the equipment is powered on, the AC-DC module first receives mains power through J1, and then performs overcurrent and reverse protection through F1 and D1. After filtering out noise through C1 and C2, the voltage is converted to 5V by U1, and then to 3.3V by U2 to provide stable power to each module. In the sensor module, J2 detects the concentration of combustible gas in the environment in real time, converts the concentration signal into an analog voltage signal, and transmits it to pin 17 of U3 after voltage division by R1 and filtering by C8. J4 detects the change in the magnetic field of the gas pipeline and transmits the consumption signal to pin 15 of U3. The human body detection module's J3 senses the status of human bodies in the area in real time, and transmits the human / no-person signal to pin 16 of U3 after stabilization by R2. After receiving the three-dimensional detection signal, U3 transmits the signal directly to U4 through pins 8, 11, and 12 without software algorithm processing. U4 converts the detection signal into a standardized communication signal, which can be transmitted via Bluetooth (or StarFlash, NB-IoT). On the one hand, it can wirelessly transmit data to the IoT smart gas meter, and on the other hand, it can wiredly transmit data to an external monitoring platform via the J5's USB interface. When a combination of signals such as no one is present, abnormal gas volume, or excessive concentration is detected, the communication module can directly trigger the valve shut-off and alarm actions of the external device, realizing hardware-level safety linkage.

[0058] In this embodiment, all functions are implemented through hardware circuits, without any content prohibited by utility model patents such as control algorithms and software logic. The circuit is fully disclosed and highly implementable, which can effectively solve the core defects of existing detectors and meet the actual needs of gas safety protection.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An intelligent combustible gas detector, characterized in that: It includes an AC-DC module, a data processing module, a sensor module, a human body detection module, and a communication module; one end of the AC-DC module is connected to the mains power, and the other end of the AC-DC module is connected to the data processing module, the sensor module, the human body detection module, and the communication module respectively, and is used to power the data processing module, the sensor module, the human body detection module, and the communication module. The data processing module is connected to the sensor module, the human body detection module, and the communication module respectively, and is used for signal processing of the data processing module, the sensor module, the human body detection module, and the communication module. The human detection module is used for monitoring whether there are people or not, the sensor module is used to detect combustible gases, and the combination of the human detection module and the sensor module improves the reliability of the detector; the communication module is used for bidirectional data transmission of the data processing module.

2. The intelligent combustible gas detector according to claim 1, characterized in that: The AC-DC module includes an input protection circuit and a voltage conversion circuit; one end of the input protection circuit is connected to the mains power, and the other end is connected to the voltage conversion circuit, thus protecting the subsequent circuits. The input protection circuit includes connector J1, fuse F1, diode D1, capacitor C1, and capacitor C2. One end of connector J1 is connected to the mains power, and the other end of connector J1 is connected to one end of fuse F1. The other end of fuse F1 is connected to one end of diode D1. The other end of diode D1 is connected to the voltage conversion circuit, one end of capacitor C1, and one end of capacitor C2, respectively. The other ends of capacitor C1 and capacitor C2 are grounded.

3. The intelligent combustible gas detector according to claim 2, characterized in that: The voltage conversion circuit includes chip U1, capacitor C3 and capacitor C4; pin 1 of chip U1 is connected to the input protection circuit, pin 3 of chip U1 is connected to one end of capacitor C3 and capacitor C4 respectively, the other end of capacitor C3 and capacitor C4 is grounded, and pin 3 of chip U1 outputs a 5V power supply. Pin 2 of chip U1 is grounded.

4. The intelligent combustible gas detector according to claim 3, characterized in that: The voltage conversion circuit also includes chip U2, capacitor C5, capacitor C6, and capacitor C7; pin 3 of chip U2 is connected to the 5V power supply and one end of capacitor C5, and the other end of capacitor C5 is grounded; pin 1 of chip U2 is grounded; pin 2 of chip U2 is connected to one end of capacitor C6 and one end of capacitor C7, and the other ends of capacitor C6 and capacitor C7 are grounded. Pin 2 of chip U2 outputs a 3.3V power supply.

5. The intelligent combustible gas detector according to claim 4, characterized in that: The sensor module includes a magnetic field sensor module and a combustible gas sensor module. The magnetic field sensor module is used to detect the amount of gas consumed, and the combustible gas sensor module is used to detect whether there is a combustible gas leak. By combining the magnetic field sensor module and the combustible gas sensor module, the reliability of detection is improved.

6. The intelligent combustible gas detector according to claim 5, characterized in that: The combustible gas sensor module includes sensor J2, resistor R4, resistor R1, and capacitor C8. Pin 1 of sensor J2 is connected to one end of resistor R4, and the other end of resistor R4 is connected to a 5V power supply. Pin 2 of sensor J2 is grounded. Pin 3 of sensor J2 is connected to the data processing module, one end of resistor R1, and one end of capacitor C8. The other end of resistor R1 is connected to a 5V power supply, and the other end of capacitor C8 is grounded.

7. The intelligent combustible gas detector according to claim 6, characterized in that: The magnetic field sensor module includes sensor J4, resistor R3, and resistor R6; pin 1 of sensor J4 is connected to one end of resistor R6, and the other end of resistor R6 is connected to a 3.3V power supply. Pin 2 of sensor J4 is grounded; pin 3 of sensor J4 is connected to the data processing module.

8. The intelligent combustible gas detector according to claim 1, characterized in that: The human body detection module includes sensor J3, resistor R2, and resistor R5; pin 1 of sensor J3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to a 5V power supply; pin 2 of sensor J3 is grounded; pin 3 of sensor J3 is connected to the data processing module and one end of resistor R2. The other end of resistor R2 is grounded.

9. The intelligent combustible gas detector according to claim 1, characterized in that: The data processing module includes chip U3 and resistor R7; pin 1 of chip U3 is connected to a 3.3V power supply, pin 2 of chip U3 is connected to the communication module and one end of resistor R7, and the other end of resistor R7 is connected to the 3.3V power supply; pin 17 of chip U3 is connected to pin 3 of sensor J2, pin 16 of chip U3 is connected to pin 3 of sensor J3, and pin 15 of chip U3 is connected to pin 3 of sensor J4. Pins 8, 11, and 12 of chip U3 are all connected to the communication module; pin 9 of chip U3 is grounded.

10. A smart combustible gas detector according to claim 9, characterized in that: The communication module includes chip U4, USB module J5, capacitors C11, C12, and C13, resistors R8, R9, R10, and R11, and fuse F2. Pin 2 of chip U4 is connected to one end of resistor R8, the other end of resistor R8 is connected to pin 11 of chip U3, pin 3 of chip U4 is connected to one end of resistor R9, and the other end of resistor R9 is connected to pin 12 of chip U3. Pin 4 of chip U4 is connected to one end of capacitor C11, and the other end of capacitor C11 is grounded; pin 5 of chip U4 is connected to one end of capacitor C12, and the other end of capacitor C12 is grounded; pin 6 of chip U4 is connected to one end of capacitor C13, and the other end of capacitor C13 is grounded; pin 13 of chip U4 is connected to one end of resistor R11, and the other end of resistor R11 is connected to pin 2 of chip U4; pin 14 of chip U4 is connected to one end of resistor R10, and the other end of resistor R10 is connected to pin 8 of chip U4; pin 16 of chip U4 is connected to a 5V power supply; pin 1 of chip U4 is grounded. Pin 1 of USB module J5 is connected to one end of fuse F2, and the other end of fuse F2 is connected to a 5V power supply. Pin 3 of USB module J5 is connected to pin 5 of chip U4, and pin 2 of USB module J5 is connected to pin 6 of chip U4; pin 4 of USB module J5 is grounded.

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