Low-power-consumption household combustible gas detector

Abstract

The utility model discloses a low-power-consumption household combustible gas detector. The low-power-consumption household combustible gas detector comprises an MCU circuit, a sensor control circuit and a power supply circuit, the MCU circuit comprises a main control chip, the sensor control circuit comprises a sensor, a partial pressure protection branch and a measurement signal branch, a first pin of the sensor is electrically connected with the partial pressure protection branch, a second pin and a fourth pin of the sensor are connected with the power supply circuit, a third pin of the sensor is electrically connected with the measurement signal branch, and a fourth pin of the sensor is electrically connected with the measurement signal branch. And the main control chip is used for controlling the voltage division protection branch to be switched between a voltage division state and a low power consumption state. When the whole combustible gas detector is powered on, the main control chip controls the voltage division protection branch to work in a voltage division state, so that the current and the voltage of the sensor are in a safe working range, and when the whole combustible gas detector completes the power-on action, the main control chip controls the voltage division protection branch to work in a low-power-consumption state, so that the current and the voltage of the sensor are in a low-power-consumption state. And the operation power consumption of the sensor control circuit is reduced, so that the purposes of protecting the sensor and reducing the system power consumption are achieved.

Description

Technical Field

[0001] This utility model relates to the field of combustible gas detection technology, specifically to a low-power household combustible gas detector. Background Technology

[0002] With increasing public awareness of safety, household combustible gas detectors are being used more and more widely. Common combustible gas detectors detect combustible gas concentration and trigger alarms, while more advanced detectors also incorporate IoT and AI analysis capabilities. As the functionality of combustible gas detectors becomes more powerful, the integrated electrical components and circuitry become increasingly complex. When the detector is powered on, if all electrical components are powered on simultaneously, excessive instantaneous power consumption can occur, causing the system to malfunction. Existing technology CN116165341A discloses a combustible gas detector that utilizes two capacitors and a resistor connecting them to form a power-on protection circuit. This circuit absorbs voltage spikes, reducing interference to power electronics and protecting the components. However, capacitor discharge requires a certain amount of time; if the capacitors are not fully discharged before power is applied again, some components may be damaged. Utility Model Content

[0003] To address the technical problems of long capacitor discharge response time and insufficient protection of components from voltage peak interference, this application provides a household combustible gas detector with power-on protection, comprising: an MCU circuit, a sensor control circuit, and a power supply circuit. The MCU circuit includes a main control chip, and the sensor control circuit includes a sensor, a voltage divider protection branch, and a measurement signal branch. The first pin of the sensor is electrically connected to the voltage divider protection branch, the second and fourth pins of the sensor are electrically connected to the power supply circuit, and the third pin of the sensor is electrically connected to the measurement signal branch. The main control chip controls the voltage divider protection branch to switch between a voltage divider state and a low-power state. When the entire combustible gas detector is powered on, the main control chip controls the voltage divider protection branch to operate in the voltage divider state, keeping the sensor's current and voltage within a safe operating range. After the entire combustible gas detector completes its power-on process, the main control chip controls the voltage divider protection branch to operate in the low-power state, reducing the operating power consumption of the sensor control circuit, thereby achieving the goal of protecting the sensor while reducing system power consumption.

[0004] Specifically, the voltage divider protection branch includes a first resistor, a second resistor, and a MOSFET. The main control chip is electrically connected to the first pin of the MOSFET through the first resistor. The second pin of the MOSFET is grounded, and the third pin is electrically connected to the first pin of the sensor. The second pin of the sensor is electrically connected to the power supply circuit. One end of the second resistor is electrically connected to the first pin of the sensor, and the other end is grounded. When the main control chip controls the MOSFET to connect the circuit between the first pin of the sensor and the ground terminal, the voltage divider protection branch enters the low-power state. When the main control chip controls the MOSFET to disconnect the circuit between the first pin of the sensor and the ground terminal, the voltage divider protection branch enters the voltage divider state. Utilizing the fast response characteristic of the transistor to quickly switch the operation of the two branches can effectively reduce the power consumption during system startup and ensure that the sensor operates under optimal conditions, thereby improving the measurement accuracy of the sensor.

[0005] Specifically, the measurement signal branch includes a third resistor, a fourth resistor, and a first capacitor. One end of the third resistor is electrically connected to the third pin of the sensor, and the other end is grounded. One end of the fourth resistor is electrically connected to the third pin of the sensor, and the other end is electrically connected to the main control chip. One end of the first capacitor is electrically connected to the main control chip, and the other end is grounded.

[0006] Furthermore, the low-power household combustible gas detector also includes a solder finger circuit, which is used to connect the detector to an external power source and for communication. By encapsulating the communication, power, and monitoring lines with the solder finger circuit, rapid batch reading of aging data can be achieved, saving wiring time. Simultaneously, the solder fingers also facilitate the positioning of the PCB circuit board by a robotic arm, improving the level of automation in the assembly of the combustible gas detector.

[0007] Specifically, the first and second pads of the solder finger circuit are electrically connected to the power supply circuit, and the third, fourth, and fifth pads of the solder finger circuit are electrically connected to the main control chip.

[0008] Furthermore, the low-power household combustible gas detector also includes a data reading serial port, which is used to read data from power test points and communication interface test points. The data reading serial port allows data records from the detector to be read without disassembling the detector, improving data reading efficiency and facilitating troubleshooting and repair.

[0009] Specifically, the first and second pins of the data reading serial port are both electrically connected to the power test point, and the third and fourth pins of the data reading serial port are electrically connected to the main control chip.

[0010] Furthermore, the low-power household combustible gas detector also includes a solenoid valve control circuit, which is electrically connected to the main control chip. The solenoid valve control circuit is used to control the working state of the solenoid valve and realize the function of closing the solenoid valve in time when a combustible gas leak occurs.

[0011] Furthermore, the low-power household combustible gas detector also includes a button control circuit, which is used to send analog signals to the main control chip, so that the main control chip can create control commands based on the analog signals.

[0012] Furthermore, the low-power household combustible gas detector also includes an LED control circuit, which includes multiple LEDs that can emit light of different colors. The LEDs are used to indicate the working status of the low-power household combustible gas detector.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. By setting up a voltage divider protection branch and using the main control chip to change the working state of the voltage divider protection branch, the voltage divider protection branch can switch between voltage divider state and low power consumption state, thereby protecting the sensor from damage by overload voltage and operating in low power consumption state, thus reducing the power consumption of the entire combustible gas detector.

[0015] 2. By encapsulating communication, power, and monitoring lines using solder finger circuitry, rapid batch reading of aging data can be achieved, saving wiring time. Simultaneously, solder fingers facilitate the positioning of PCB circuit boards by robotic arms, improving the level of automation in combustible gas detector assembly.

[0016] 3. The data reading serial port allows for reading the detector's data records without disassembling the detector, improving data reading efficiency and facilitating troubleshooting and maintenance. Attached Figure Description

[0017] Figure 1 This is the electrical schematic diagram of the sensor control circuit in this utility model.

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 3 This is the electrical schematic diagram of the tin finger circuit in this utility model.

[0020] Figure 4 This is the electrical schematic diagram of the serial port for data reading in this utility model.

[0021] Figure 5 This is the electrical schematic diagram of the solenoid valve control circuit in this utility model.

[0022] Figure 6 This is the electrical schematic diagram of the button control circuit in this utility model.

[0023] Figure 7 This is the electrical schematic diagram of the LED control circuit in this utility model. Detailed Implementation

[0024] 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.

[0025] refer to Figure 1 This utility model provides a low-power household combustible gas detector, including an MCU circuit, a sensor control circuit, and a power supply circuit. The MCU circuit includes a main control chip, and the sensor control circuit includes a sensor, a voltage divider protection branch, and a measurement signal branch. The first pin of the sensor is electrically connected to the voltage divider protection branch, the second and fourth pins of the sensor are connected to the power supply circuit, and the third pin of the sensor is electrically connected to the measurement signal branch. The main control chip controls the voltage divider protection branch to switch between a voltage divider state and a low-power state. When the entire combustible gas detector is powered on, the main control chip controls the voltage divider protection branch to operate in the voltage divider state, keeping the sensor's current and voltage within a safe operating range. After the entire combustible gas detector has completed its power-on process, the main control chip controls the voltage divider protection branch to operate in the low-power state, reducing the operating power consumption of the sensor control circuit, thereby achieving the goal of protecting the sensor while reducing system power consumption.

[0026] Specifically, refer to Figure 1 The voltage divider protection branch includes a first resistor R38, a second resistor R39, and a MOSFET Q7. The flammability control pin of the main control chip is electrically connected to the first pin of the MOSFET Q7 through the first resistor R38. The second pin of the MOSFET Q7 is grounded, and the third pin is electrically connected to the first pin of the sensor. The second pin of the sensor is electrically connected to the power supply circuit. One end of the second resistor R39 is electrically connected to the first pin of the sensor, and the other end is grounded.

[0027] When the detector is powered on, multiple components such as the buzzer, LED indicator, and sensor are powered on simultaneously. This may result in excessive instantaneous power consumption, causing system voltage instability, which could damage the sensor and the main control chip, leading to system malfunction. In this situation, the main control chip controls the MOSFET Q7 to disconnect the circuit between the sensor's first pin and ground, creating a loop with the +5V power supply, sensor, second resistor R39, and ground. The voltage divider protection branch enters voltage divider mode, and the second resistor R39 shares the voltage in the loop, reducing the loop current.

[0028] Once all detectors are powered on, system initialization is complete. The main control chip controls MOSFET Q7 to connect the circuit between the sensor's first pin and ground. The +5V power supply, sensor, MOSFET Q7, and ground form a loop, and the voltage divider protection branch enters a low-power state, allowing the sensor control circuit to operate in a low-power mode. Utilizing the transistor's fast response characteristic to quickly switch between the two branches effectively reduces the power consumption during system startup and ensures the sensor operates under optimal conditions, thereby improving the sensor's measurement accuracy.

[0029] Specifically, the measurement signal branch includes a third resistor RL1, a fourth resistor R36, and a first capacitor C12. One end of the third resistor RL1 is electrically connected to the third pin of the sensor, and the other end is grounded. One end of the fourth resistor R36 is electrically connected to the third pin of the sensor, and the other end is electrically connected to the flammable voltage pin of the main control chip. One end of the first capacitor C12 is electrically connected to the main control chip, and the other end is grounded. The electrical signal generated by the sensor is transmitted to the main control chip via the fourth resistor R36.

[0030] Specifically, the main control chip can be implemented in various ways. In this embodiment, the main control chip adopts the HC32L110C6PA microcontroller, which is an ultra-low power MCU with a wide voltage operating range. It integrates a 12-bit 1Msps high-precision SARADC and inherits communication peripherals such as comparators, multiple UARTs, SPI, and I2C. It features high integration, high reliability, and ultra-low power consumption.

[0031] Further, refer to Figure 2 The low-power household combustible gas detector provided in the embodiments of this utility model also includes an electromagnetic valve control circuit, an LED control circuit, a button control circuit, a solder finger circuit, and a data reading serial port.

[0032] Solder finger circuitry is used to connect external power and facilitate communication for household combustible gas detectors. See reference [link / reference] for details. Figure 3The first and second pads of the solder finger circuit are electrically connected to the power supply circuit, while the third, fourth, and fifth pads are electrically connected to the main control chip. By encapsulating the communication, power, and monitoring lines through the solder finger circuit, rapid batch reading of aging data can be achieved, saving wiring time. Simultaneously, the solder fingers facilitate the positioning of PCB circuit boards by robotic arms, improving the level of automation in the assembly of combustible gas detectors.

[0033] The J4 serial port is used to read data from the power test point and the communication interface test point. For details, please refer to... Figure 4 The first and second pins of the data reading serial port J4 are electrically connected to the power test point, while the third and fourth pins are electrically connected to the main control chip. This data reading serial port allows for reading the detector's data records without disassembling the detector, improving data reading efficiency and facilitating troubleshooting and repair.

[0034] The solenoid valve control circuit is used to control the operating state of the solenoid valve, enabling it to close promptly in the event of a flammable gas leak. Specifically, refer to... Figure 5 The external serial port J2 of the solenoid valve control circuit is connected to the solenoid valve, and the main control chip controls the solenoid valve's operation through transistor switches Q4 and Q3.

[0035] The button control circuit is used to enable button control of the combustible gas detector. See details... Figure 6 The button sends an analog signal indicating the duration of voltage transmission to the main control chip. The main control chip then creates control commands based on the analog signal to control the combustible gas detector and perform self-testing functions.

[0036] The LED control circuit includes multiple LEDs. The main control chip controls different LEDs to display different colors based on the operating status of the combustible gas detector, thus indicating the detector's status. For example, see reference... Figure 7 The LED control circuit includes four LEDs. The main control chip adjusts the power supply of each LED based on the feedback signals from each circuit. The first LED (LED1) emits yellow light to indicate a fault or insufficient lifespan. The second LED (LED2) emits green light to indicate that the detector is working normally. The third LED (LED3) emits yellow light to indicate that the detector is in standby mode. The fourth LED (LED4) emits red light to indicate danger or a situation requiring immediate attention.

[0037] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-power household combustible gas detector, characterized in that, This includes MCU circuitry, sensor control circuitry, and power supply circuitry. The MCU circuit includes a main control chip; The sensor control circuit includes a sensor, a voltage divider protection branch, and a measurement signal branch. The first pin of the sensor is electrically connected to the voltage divider protection branch, the second and fourth pins of the sensor are electrically connected to the power supply circuit, and the third pin of the sensor is electrically connected to the measurement signal branch. The main control chip is used to control the voltage divider protection branch to switch between voltage divider state and low power consumption state.

2. The low-power household combustible gas detector according to claim 1, characterized in that, The voltage divider protection branch includes a first resistor, a second resistor, and a MOS transistor. The main control chip is electrically connected to the first pin of the MOS transistor through the first resistor. The second pin of the MOS transistor is grounded, and the third pin is electrically connected to the first pin of the sensor. The second pin of the sensor is electrically connected to the power supply circuit. One end of the second resistor is electrically connected to the first pin of the sensor, and the other end is grounded. When the main control chip controls the MOS transistor to connect the circuit between the first pin of the sensor and the ground terminal, the voltage divider protection branch enters the low power state. When the main control chip controls the MOS transistor to disconnect the circuit between the first pin of the sensor and the ground terminal, the voltage divider protection branch enters the voltage divider state.

3. The low-power household combustible gas detector according to claim 1, characterized in that, The measurement signal branch includes a third resistor, a fourth resistor, and a first capacitor; One end of the third resistor is electrically connected to the third pin of the sensor, and the other end is grounded; One end of the fourth resistor is electrically connected to the third pin of the sensor, and the other end is electrically connected to the main control chip; One end of the first capacitor is electrically connected to the main control chip, and the other end is grounded.

4. The low-power household combustible gas detector according to claim 1, characterized in that, The low-power household combustible gas detector also includes a solder finger circuit, which is used to connect the low-power household combustible gas detector to an external power source and for communication.

5. The low-power household combustible gas detector according to claim 4, characterized in that, The first and second pads of the solder finger circuit are electrically connected to the power supply circuit, and the third, fourth, and fifth pads of the solder finger circuit are electrically connected to the main control chip.

6. The low-power household combustible gas detector according to claim 1, characterized in that, The low-power household combustible gas detector also includes a data reading serial port, which is used to read data from the power test point and the communication interface test point.

7. The low-power household combustible gas detector according to claim 6, characterized in that, The first and second pins of the data reading serial port are both electrically connected to the power test point, and the third and fourth pins of the data reading serial port are electrically connected to the main control chip.

8. The low-power household combustible gas detector according to claim 1, characterized in that, The low-power household combustible gas detector also includes a solenoid valve control circuit, which is electrically connected to the main control chip and is used to control the working state of the solenoid valve.

9. The low-power household combustible gas detector according to claim 1, characterized in that, The low-power household combustible gas detector also includes a button control circuit, which is used to send analog signals to the main control chip, so that the main control chip can create control commands based on the analog signals.

10. The low-power household combustible gas detector according to claim 1, characterized in that, The low-power household combustible gas detector also includes an LED control circuit, which includes multiple LEDs that can emit light of different colors. The LEDs are used to indicate the working status of the low-power household combustible gas detector.

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