Intelligent detection and alarm equipment for gas environment

Abstract

The utility model provides intelligent detection and alarm equipment for a gas environment, which detects the gas concentration, smoke, environment temperature, personnel existence and activity states in the environment in real time, and regularly sends detection data and the like to an upper computer through an RS485 bus or a voice and 4G communication module. When the gas concentration, the smoke and the environment temperature of the environment exceed warning values, the equipment reports instant alarm information to an upper computer, directly sends the information to a platform server and / or a mobile phone client, and knows whether a person has a rescue demand or not in the alarm environment at the first time; personnel in distress can carry out voice communication with the control center, and the control center can also send group broadcast to all users to inform the users of whether the users need to evacuate and how to evacuate. When a dangerous case is known by using the equipment, whether a person needing to be rescued exists in the environment where the equipment is located can be known, so that limited rescue resources are preferentially used for rescuing the person, and casualties are avoided to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of signal circuit equipment in the Internet of Things, and in particular to a gas environment intelligent detection and alarm device. Background Art

[0002] Traditional fire alarms can only send alarms to the fire control room or host computer through the fire bus, with a single transmission path. In addition, since the sensor only detects fire information such as smoke and cannot collect multiple harmful gas data at the same time, traditional fire alarm equipment can only respond to ordinary fire alarm scenes, but lacks response mechanisms for scenes such as toxic and harmful gas leakage and air quality pollution. At the same time, when traditional equipment detects the corresponding alarm, it cannot distinguish whether there are people in the environment, which not only delays rescue time, but also makes it impossible to accurately allocate rescue resources. Utility Model Content

[0003] The utility model provides a gas environment intelligent detection alarm device, which detects the gas concentration, smoke, ambient temperature, presence and activity status of people in the environment in real time, and sends detection data to the host computer through RS485 bus or voice and 4G communication module at regular intervals. When the gas concentration, smoke and ambient temperature of the environment exceed the warning value, the device will report the immediate alarm information to the host computer, and directly send the information to the platform server and / or mobile client at the same time, and know whether there is a rescue need for people in the alarm environment at the first time; the person in distress can have a voice call with the control center, and the control center can also send a group broadcast to all users to inform the user whether to evacuate and how to evacuate. When the device of the utility model is used to know the dangerous situation, it can be known whether there are people who need rescue in the environment where this device is located, so as to give priority to the use of limited rescue resources for the rescue of people and avoid casualties to the greatest extent.

[0004] The utility model provides a gas environment intelligent detection alarm device, which is characterized by:

[0005] Including ambient temperature detection module, ambient gas detection module, human body sensing detection module, power module, sound and light alarm module, 485 communication module, voice and 4G communication module, main processor MCU module;

[0006] The ambient temperature detection module specifically detects the ambient temperature through a temperature measurement chip and outputs an analog signal of the ambient temperature value;

[0007] The environmental gas detection module specifically detects the concentration of the gas in the environment through one or more gas sensors therein, and outputs an analog signal of the gas concentration value. The environmental gas detection module includes:

[0008] MQ-2 gas sensor, used to detect smoke, including smoke from smoking and burning objects;

[0009] MQ-7 gas sensor, used to detect carbon monoxide gas;

[0010] MQ-135 gas sensor, used to detect one or more of ammonia, sulfide, and benzene vapor;

[0011] The human body sensing detection module is used to detect whether there are people in the environment;

[0012] The power module is used to provide a stable and anti-interference power supply for the device;

[0013] The sound and light alarm module is used to generate sound and flash alarm under predetermined conditions;

[0014] The 485 communication module and the voice and 4G communication module are used for communication between the main processor MCU module and the central control room. The voice and 4G communication module is also used for data communication including voice between the user and the central control room;

[0015] The main processor MCU module is used to receive the analog signal sent by the ambient temperature detection module and / or the ambient gas detection module, and in combination with the signal sent by the human body sensing detection module, interact with the host computer and interact with the sound and light alarm module. The main processor MCU module includes:

[0016] MCU, used to store programs and parameters, and provide corresponding data calculation functions;

[0017] The first crystal is used for the timing signal of the main processor MCU module;

[0018] The second crystal is used for the operation signal of the main processor MCU module;

[0019] A reset circuit is connected to the reset pin of the main processor MCU module to provide a watchdog function;

[0020] DIP switch, used to number the device.

[0021] The main processor MCU module specifically includes:

[0022] U1 is MCU, which can use STM32F103RC chip;

[0023] XT1 is the first crystal, which can be a 32.768K crystal;

[0024] XT2 is the second crystal, which can be an 8M crystal;

[0025] U2 is a reset circuit, which is connected to the reset pin of the main processor MCU module and provides a watchdog function. When the main processor MCU module cannot feed the watchdog regularly through the WDI pin, a reset signal will be generated to prevent the main processor MCU module from freezing and ensure the reliability of equipment operation;

[0026] SW1 is a dip switch used to number the devices. A total of 256 numbers can be set.

[0027] The environmental gas detection module specifically includes:

[0028] U401 is MQ-2 gas sensor;

[0029] U402 is MQ-7 gas sensor;

[0030] U403 is MQ-135 gas sensor;

[0031] Q401, Q402 and the resistors R401, R402, R403 in the circuit form the power supply circuit of the gas sensor. The signal VCC_TU_EN controls the circuit power supply. When the power supply +5V_TU is added to U401, U402, and U403 at the same time, an analog quantity is output at the VO pin. The analog output values ​​of different gas sensors are different, and different gas concentrations will also lead to different analog output values.

[0032] U404:A, U404:B, and U404:C are all operational amplifiers, which form a conditioning circuit with the surrounding circuits, and the signals are output to the TU_AI1, TU_AI2, and TU_AI3 pins of the main processor MCU module.

[0033] The ambient temperature detection module specifically includes:

[0034] U501 is a temperature measurement chip, which can be TC1047, with a +3.3V power supply, and outputs the temperature analog value TEMP_ADC to the main processor MCU module;

[0035] U502 is a precision power supply, specifically REF3025, and its output signal is connected to the 13th pin of the main processor MCU module as the reference power supply of the A / D circuit.

[0036] The main processor MCU module reads its own chip operating temperature data, and the voice and 4G communication module reads its own operating temperature data;

[0037] The above two temperature data are compared and verified with the temperature data read by the ambient temperature detection module to determine whether the change in ambient temperature is real and reliable.

[0038] The voice and 4G communication module specifically includes:

[0039] U601 is a voice and 4G communication module, which can be specifically SIM7600C1 and can be connected to the public network. The main processor MCU module is connected to U601 through serial port signals 4G_TXD and 4G_RXD;

[0040] Q603, Q604, R611, R612, R613, and R614 form a level conversion circuit to convert 4G_TXD and 4G_RXD signals into 4GM_TXD and 4GM_RXD signals, which are connected to U601;

[0041] J602 is the SIM card holder;

[0042] Q602, R609, R610 are the power control circuit of U601, which is used to control the module power on / off;

[0043] U602 is a PCM encoding chip, specifically NAU8810, with an external microphone MIC and a speaker SPK. The analog signals of the MIC and SPK are encoded by U602, converted into digital signals, and connected to the voice and 4G communication module.

[0044] The sound and light alarm module specifically comprises:

[0045] LS is a sound and light buzzer, which can emit loud sound and flash light;

[0046] The pin 22 of the main processor MCU module sends out an ALARM signal, which is driven by Q701, R702, R703, and D701 to form a drive circuit, drive relay K701 to operate, and power on LS.

[0047] The 485 communication module specifically includes:

[0048] U802, specifically CA-IS3082, is used to isolate the 485 signals in the circuit and on the line, and shield the interference signals on the external 485 line;

[0049] U801, specifically B0303BS, is used to isolate the power supply and ground signal on the circuit from the power supply and ground signal on the external line at the same time.

[0050] The human body sensing detection module specifically includes:

[0051] 24G radar, the corresponding U901 main chip can be BGT24LTR11N16, using FMCW frequency modulation continuous wave to detect human targets in the set space, combined with radar signal processing and human body sensing algorithm to achieve sensing detection of human presence, and can identify human bodies in motion and static states;

[0052] A receiving plate antenna and a transmitting plate antenna;

[0053] U902 is an infrared sensing chip, and its corresponding infrared sensing circuit is used to detect possible human bodies in the environment;

[0054] Q901 and Q902 form a power switch circuit, and the power supply of the human body sensing detection module is controlled by the VCC_LD_EN signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is the overall diagram of the composition of the gas environment intelligent detection and alarm equipment.

[0056] Figure 2 It is the main control processor MCU module of this device.

[0057] Figure 3 This is the power module of this device.

[0058] Figure 4 It is the environmental gas detection module of this equipment.

[0059] Figure 5 It is the ambient temperature detection module of this device.

[0060] Figure 6 It is the voice and 4G communication module of this device.

[0061] Figure 7 It is the sound and light alarm module of this device.

[0062] Figure 8 It is the 485 communication module of this device.

[0063] Fig. 9 It is a human body sensing detection module.

[0064] Fig.10 This is the installation diagram of this equipment. DETAILED DESCRIPTION

[0065] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the present embodiment will be fully and clearly described below in conjunction with the drawings in the embodiments of the present application.

[0066] Figure 1 The figure is a general diagram of the composition of the gas environment intelligent detection and alarm device, which consists of 8 parts, namely: ambient temperature detection module, ambient gas detection module, human body sensing detection module, power module, sound and light alarm module, 485 communication module, voice and 4G communication module, and main processor MCU module. Those skilled in the art will know that the modules are specifically corresponding circuits in this embodiment.

[0067] In the circuit of this device, the ambient temperature detection module specifically detects the ambient temperature through a temperature measuring chip and outputs an analog signal of the ambient temperature value; when the gas sensor detects the gas present in the environment, the conductivity of the gas sensor increases with the increase of the gas concentration in the air, and the gas sensor detects and outputs an analog voltage signal.

[0068] The analog signal is input into the main processor MCU module, the ambient temperature value and / or the gas concentration value are read, and the ambient temperature value and / or the gas concentration value are compared with the environmental warning threshold value stored in the main processor MCU module. The environmental warning threshold value can be obtained by sending data from the host computer. At the same time, the main processor MCU module periodically reports the environment in which the equipment is located to the host computer, and starts the human body sensing detection module to detect the presence of people in the environment and report to the host computer immediately; when an emergency of the corresponding level occurs, the sound and light alarm module is started to remind the relevant personnel in the environment through various methods such as specific voice calls or voice group broadcasts, or take measures such as evacuation in serious cases. In one embodiment, the host computer can be located in the control center.

[0069] The environmental warning threshold is set to one or more; when the main processor MCU module determines that any one of the gas concentration values, the weighted average of the gas concentration values, and the ambient temperature value exceeds the corresponding primary environmental warning threshold, a reminder message is issued; when the main processor MCU module determines that any one of the gas concentration values, the weighted average of the gas concentration values, and the ambient temperature value exceeds the corresponding next-level environmental warning threshold, while issuing a reminder message, an alarm is issued and personnel are notified to evacuate.

[0070] Figure 2 The main control processor MCU module of this device includes:

[0071] U1 is MCU, which can be specifically STM32F103RC. The memory in this chip not only stores programs, but also stores setting parameters, including the thresholds required for various gas sensors to alarm, the thresholds for high temperature alarms, and accepts various parameters set by the host computer for the product through the 485 communication module or voice and 4G communication module, while providing corresponding data calculation functions;

[0072] XT1 is a crystal, specifically a 32.768K crystal, which is used for the timing signal of the main processor MCU module;

[0073] XT2 is a crystal, specifically an 8M crystal, which is used for the operation signal of the main processor MCU module;

[0074] U2 is a reset circuit, which is connected to the reset pin of the main processor MCU module and provides a watchdog function. When the main processor MCU module cannot feed the watchdog regularly through the WDI pin, a reset signal will be generated to prevent the main processor MCU module from freezing and ensure the reliability of equipment operation;

[0075] SW1 is a dip switch used to number devices. A total of 256 numbers can be set, that is, 256 node devices can be set on an RS485 bus.

[0076] Figure 3 This is the power module of this device. The input power is DC24V or battery. When an alarm occurs, if the DC24V power supply is unavailable, the battery will be used for power supply. Normally, the DC24V power supply will charge the battery.

[0077] There are 3 groups of output power supplies, namely +3.3V (ambient temperature detection module, human body sensing detection module, sound and light alarm module, 485 communication module, main processor MCU module), +5V (ambient gas detection module), VCC_4G (voice and 4G communication module), VCC_4G can specifically be +4.2V; there is another group of output power supplies to charge the battery.

[0078] In the circuit, F201 is a fuse to prevent the circuit from overloading current; RV201 is a varistor to prevent the circuit from overloading voltage; D201 is a bidirectional TVS transient suppression diode to eliminate circuit surges; D202 is a switching diode to prevent users from connecting the power supply in reverse; C202 and C203 form a filter circuit to eliminate circuit interference signals.

[0079] The circuit composed of U204, Q201, L204, D203, D204, R228, R227, R229 and R230 is used to charge the +12V lithium battery pack, wherein U204 can specifically adopt the charging chip CN3705.

[0080] Q202 is a MOS tube. When the +24V DC power supply is available, the DC power supply directly powers the entire device circuit (+Vin); when the DC power supply is not available, the circuit is switched and the battery powers the entire device circuit (+Vin).

[0081] U201, L201, R203, R204, R205 form a step-down circuit to voltage VCC_4G, which is used for voice and 4G communication module power supply;

[0082] U202, L202, R206, R207, and R208 form a step-down circuit to a voltage of +5V, which is used as the power supply for the environmental gas detection module;

[0083] U201, L201, R203, R204, and R205 form a step-down circuit to a + voltage of 3.3V, which is used as power supply for the rest of the circuits.

[0084] Figure 4 The environmental gas detection module of this device is equipped with three types of gas sensors, including:

[0085] U401 is an MQ-2 gas sensor used to detect smoke, including smoke from smoking and burning objects;

[0086] U402 is an MQ-7 gas sensor used to detect carbon monoxide gas;

[0087] U403 is an MQ-135 gas sensor used to detect one or more of ammonia, sulfide, and benzene vapor;

[0088] Q401, Q402 and the resistors R401, R402, R403 in the circuit form the power supply circuit of the gas sensor. The signal VCC_TU_EN controls the circuit power supply. When the power supply +5V_TU is added to U401, U402, and U403 at the same time, an analog quantity is output at the VO pin. The analog output values ​​of different gas sensors are different, and different gas concentrations will also lead to different analog output values.

[0089] U404:A, U404:B, and U404:C are all operational amplifiers, which form a conditioning circuit with the surrounding circuits, and the signals are output to the TU_AI1, TU_AI2, and TU_AI3 pins of the main processor MCU module.

[0090] Figure 5 This is the ambient temperature detection module of the device, which is used to detect the ambient temperature, including:

[0091] U501 is a temperature measurement chip, which can be TC1047, with a +3.3V power supply, and outputs the temperature analog value TEMP_ADC to the main processor MCU module;

[0092] U502 is a precision power supply, specifically REF3025, with an accuracy of 30PPM. The output signal is connected to pin 13 of the main processor MCU module as a reference power supply for the A / D circuit.

[0093] The main processor MCU module reads its own chip operating temperature data, and the voice and 4G communication module can also read its own operating temperature data; the above two temperature data are compared and verified with the temperature data read by the ambient temperature detection module to determine whether the change in ambient temperature is real and reliable, and verified in conjunction with the data read by the smoke sensor, which helps to determine whether a fire has occurred.

[0094] Figure 6 It is the voice and 4G communication module of this device, including:

[0095] U601 is a voice and 4G communication module, which can be specifically SIM7600C1 and can be connected to the public network. The main processor MCU module is connected to U601 through serial port signals 4G_TXD and 4G_RXD;

[0096] Q603, Q604, R611, R612, R613, and R614 form a level conversion circuit to convert 4G_TXD and 4G_RXD signals into 4GM_TXD and 4GM_RXD signals, which are connected to U601;

[0097] J602 is a SIM card holder. When using this device, the user should insert the SIM card provided by the telecom operator first;

[0098] Q602, R609, R610 are the power control circuit of U601, which is used to control the module power on / off;

[0099] U602 is a PCM encoding chip, specifically NAU8810, with an external microphone MIC and a speaker SPK. The analog signals of the MIC and SPK are encoded by U602, converted into digital signals, and connected to the voice and 4G communication module.

[0100] The data collected by this device can be sent to the host computer through voice and 4G communication modules; the user of this device can press the KEY button to have a voice call with the control center; at the same time, the control center can also send a group broadcast to all users to inform users whether they need to evacuate and how to evacuate.

[0101] Figure 7 It is the sound and light alarm module of this equipment, specifically including:

[0102] LS is a sound and light buzzer, which can emit loud sound and flash light;

[0103] The pin 22 of the main processor MCU module sends out an ALARM signal, which is driven by Q701, R702, R703, and D701 to form a drive circuit, drive relay K701 to operate, and power on LS.

[0104] Figure 8 This is the 485 communication module of this device, which is connected to multiple node devices on the same bus and collected to the host computer for external communication. In order to avoid mutual interference between node devices, this device adopts isolation design for external 485 signals:

[0105] U802, specifically CA-IS3082, is used to isolate the 485 signals in the circuit and on the line, and shield the interference signals on the external 485 line;

[0106] U801, specifically B0303BS, is used to isolate the power supply and ground signal on the circuit from the power supply and ground signal on the external line at the same time, protecting the power supply of the 485 communication module from interference and damage from the external line.

[0107] Fig. 9 It is a human body sensing detection module, which specifically includes:

[0108] 24G radar, the corresponding U901 main chip can be BGT24LTR11N16, using FMCW frequency modulation continuous wave to detect human targets in the set space, combined with radar signal processing and human body sensing algorithm to achieve sensing detection of human presence, and can identify human bodies in motion and static states;

[0109] Receiving plate antenna and transmitting plate antenna, the detection distance can reach 6 meters;

[0110] U902 is an infrared sensing chip, and its corresponding infrared sensing circuit is used to detect the human body that may exist in the environment. The infrared detection distance can reach 6 meters.

[0111] Since radar sensing has blind spots and infrared sensing may misjudge when a fire occurs, in this embodiment, radar and infrared sensing detect simultaneously to compensate for each other's deficiencies, thereby accurately detecting the presence of people and avoiding false alarms.

[0112] Q901 and Q902 form a power switch circuit, and the power supply of the human body sensing detection module is controlled by the VCC_LD_EN signal; when VCC_LD_EN is at a high level, the human body sensing detection module is powered, otherwise it is powered off.

[0113] Fig.10 This is a schematic diagram of the installation of the device. In one embodiment, the device is installed on the top, but side installation and other installation methods may also be adopted.

[0114] Those skilled in the art will appreciate that, although in a preferred embodiment, the device is used for detection and alarm of a general indoor gas environment; other implementations may also be selected, such as a radar device with a larger detection range. In this case, the device is also suitable for application scenarios such as residential buildings, office buildings, factory production lines, breeding plants or zoos.

Claims

1. A gas environment intelligent detection and alarm device, characterized in that: Including ambient temperature detection module, ambient gas detection module, human body sensing detection module, power module, sound and light alarm module, 485 communication module, voice and 4G communication module, main processor MCU module; The ambient temperature detection module specifically detects the ambient temperature through a temperature measurement chip and outputs an analog signal of the ambient temperature value; The environmental gas detection module specifically detects the concentration of the gas in the environment through one or more gas sensors therein, and outputs an analog signal of the gas concentration value. The environmental gas detection module includes: MQ-2 gas sensor, used to detect smoke, including smoke from smoking and burning objects; MQ-7 gas sensor, used to detect carbon monoxide gas; MQ-135 gas sensor, used to detect one or more of ammonia, sulfide, and benzene vapor; The human body sensing detection module is used to detect whether there are people in the environment; The power module is used to provide a stable and anti-interference power supply for the device; The sound and light alarm module is used to generate sound and flash alarm under predetermined conditions; The 485 communication module and the voice and 4G communication module are used for communication between the main processor MCU module and the central control room. The voice and 4G communication module is also used for data communication including voice between the user and the central control room; The main processor MCU module is used to receive the analog signal sent by the ambient temperature detection module and / or the ambient gas detection module, and in combination with the signal sent by the human body sensing detection module, interact with the host computer and interact with the sound and light alarm module. The main processor MCU module includes: MCU, used to store programs and parameters, and provide corresponding data calculation functions; The first crystal is used for the timing signal of the main processor MCU module; The second crystal is used for the operation signal of the main processor MCU module; A reset circuit is connected to the reset pin of the main processor MCU module to provide a watchdog function; DIP switch, used to number the device.

2. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The main processor MCU module specifically includes: U1 is MCU, which can use STM32F103RC chip; XT1 is the first crystal, which can be a 32.768K crystal; XT2 is the second crystal, which can be an 8M crystal; U2 is a reset circuit, which is connected to the reset pin of the main processor MCU module and provides a watchdog function. When the main processor MCU module cannot feed the watchdog regularly through the WDI pin, a reset signal will be generated to prevent the main processor MCU module from freezing and ensure the reliability of equipment operation; SW1 is a dip switch used to number the devices. A total of 256 numbers can be set.

3. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The environmental gas detection module specifically includes: U401 is MQ-2 gas sensor; U402 is MQ-7 gas sensor; U403 is MQ-135 gas sensor; Q401, Q402 and the resistors R401, R402, R403 in the circuit form the power supply circuit of the gas sensor. The signal VCC_TU_EN controls the circuit power supply. When the power supply +5V_TU is added to U401, U402, and U403 at the same time, an analog quantity is output at the VO pin. The analog output values ​​of different gas sensors are different, and different gas concentrations will also lead to different analog output values. U404:A, U404:B, and U404:C are all operational amplifiers, which form a conditioning circuit with the surrounding circuits, and the signals are output to the TU_AI1, TU_AI2, and TU_AI3 pins of the main processor MCU module.

4. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The ambient temperature detection module specifically includes: U501 is a temperature measurement chip, which can be TC1047, with a +3.3V power supply, and outputs the temperature analog value TEMP_ADC to the main processor MCU module; U502 is a precision power supply, specifically REF3025, and its output signal is connected to the 13th pin of the main processor MCU module as the reference power supply of the A / D circuit.

5. The gas environment intelligent detection and alarm device according to claim 4 is characterized in that: The main processor MCU module reads its own chip operating temperature data, and the voice and 4G communication module reads its own operating temperature data; The above two temperature data are compared and verified with the temperature data read by the ambient temperature detection module to determine whether the change in ambient temperature is real and reliable.

6. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The voice and 4G communication module specifically includes: U601 is a voice and 4G communication module, which can be specifically SIM7600C1 and can be connected to the public network. The main processor MCU module is connected to U601 through serial port signals 4G_TXD and 4G_RXD; Q603, Q604, R611, R612, R613, and R614 form a level conversion circuit to convert 4G_TXD and 4G_RXD signals into 4GM_TXD and 4GM_RXD signals, which are connected to U601; J602 is the SIM card holder; Q602, R609, R610 are the power control circuit of U601, which is used to control the module power on / off; U602 is a PCM encoding chip, specifically NAU8810, with an external microphone MIC and a speaker SPK. The analog signals of the MIC and SPK are encoded by U602, converted into digital signals, and connected to the voice and 4G communication module.

7. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The sound and light alarm module specifically comprises: LS is a sound and light buzzer, which can emit loud sound and flash light; The pin 22 of the main processor MCU module sends out an ALARM signal, which is driven by Q701, R702, R703, and D701 to form a drive circuit, drive relay K701 to operate, and power on LS.

8. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The 485 communication module specifically includes: U802, specifically CA-IS3082, is used to isolate the 485 signals in the circuit and on the line, and shield the interference signals on the external 485 line; U801, specifically B0303BS, is used to isolate the power supply and ground signal on the circuit from the power supply and ground signal on the external line at the same time.

9. The gas environment intelligent detection and alarm device according to claim 1 is characterized in that: The human body sensing detection module specifically includes: 24G radar, the corresponding U901 main chip can be BGT24LTR11N16, using FMCW frequency modulation continuous wave to detect human targets in the set space, combined with radar signal processing and human body sensing algorithm to achieve sensing detection of human presence, and can identify human bodies in motion and static states; A receiving plate antenna and a transmitting plate antenna; U902 is an infrared sensing chip, and its corresponding infrared sensing circuit is used to detect possible human bodies in the environment; Q901 and Q902 form a power switch circuit, and the power supply of the human body sensing detection module is controlled by the VCC_LD_EN signal.

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