A control circuit for forced natural gas and a device using the same

Abstract

The utility model relates to disclose a kind of control circuit and the device of application of the circuit for strong exhaust natural gas.The control circuit includes: control chip U4, its 8th foot is connected button T1;Fan control circuit, the 9th foot of connection control chip U4 and fan;Transmitting circuit and receiving circuit are connected control chip U4 respectively and are used to transmit and receive wireless signal.The device of application of this control circuit includes shell, and it is equipped with the control circuit, battery and wiring terminal integrated on control circuit, switch button, matching button and charging connector in it.The utility model core lies in that remote alarm is realized by transmitting circuit and receiving circuit, the problem of controller position fixed, lack of remote response capability in prior art is solved.Specific effect includes:1) realize mobile phone linkage control and natural gas leakage alarm;2) shell is installed fast and battery is exempted from tool disassembly by wall hanging groove and the battery clamping piece of elastic fixed part.

Description

Technical Field

[0001] This utility model relates to the technical field of exhaust fan controllers for kitchen use, and in particular to a control circuit for forced exhaust of natural gas and a device using the circuit. Background Technology

[0002] In self-built houses and kitchens without pre-installed chimneys, exhaust fans are crucial for ensuring air circulation. Traditional exhaust fan controllers generally suffer from the following drawbacks: 1. Functional limitations: It only supports physical button switch control and cannot realize remote alarm. When the user is not in the kitchen (such as in the early stage of a natural gas leak), the user may not be able to know in time, which poses a significant safety hazard; 2. Rigid installation: The controller needs to be fixed in a specific position on the wall and cannot be moved flexibly according to the actual use environment (such as changes in the gas stove position or temporary need to adjust the exhaust direction), resulting in reduced exhaust efficiency; 3. System closedness: It lacks the ability to interact with smart terminals, cannot remotely monitor the status or receive alarms through mobile phones or other devices, and does not integrate protection functions such as battery power detection and fault prompts. Summary of the Invention

[0003] The purpose of this invention is to provide a control circuit for forced natural gas discharge and a device for using the circuit, so as to solve the problems of fixed controller position and lack of remote warning capability in the prior art, and to overcome the shortcomings of the prior art.

[0004] A control circuit for forced natural gas discharge, designed for this purpose, includes: Control chip U4, with button T1 connected to pin 8 of control chip U4; The fan control circuit is connected to pin 9 of the control chip U4. The transmitting circuit and the receiving circuit are connected to the control chip U4, and are used to transmit and receive signals, respectively.

[0005] Specifically, pin 9 of the control chip U4 is connected to the fan control circuit 800. The fan control circuit 800 includes a fifth field-effect transistor Q5, a FAN_BEF terminal, a fourth diode D4, a fan connector J4, a FAN_ON / TCK terminal, a twenty-second resistor R22, a seventh capacitor C7, and a BAT+12V terminal. The FAN_BEF terminal is connected to the source (S) terminal of the fifth field-effect transistor Q5, the drain (D) terminal of the fifth field-effect transistor Q5 is connected to the fourth diode D4, the fourth diode D4 is connected to pin 1 of the fan connector J4, the fifth field-effect transistor Q5 is connected to the twenty-second resistor R22, the twenty-second resistor R22 is connected to the FAN_ON / TCK terminal, the FAN_BEF terminal is connected to pin 9 of the control chip U4, the FAN_ON / TCK terminal is connected to pin 5 of the control chip U4, the drain (D) terminal of the fifth field-effect transistor Q5 is connected to pin 2 of the fan connector J4, and the fan connector J4 is connected to the fan.

[0006] Specifically, the transmitting circuit 1100 includes a first antenna T4, a transmitting chip U3, a first surface mount crystal oscillator T2, a 315_3V3 terminal, and a 315M_DATA terminal. The first antenna T4 is connected to pins 1, 2, and 3 of the transmitting chip U3. The 315_3V3 terminal is connected to pin 5 of the transmitting chip U3. The 315M_DATA terminal is connected to pin 4 of the transmitting chip U3. The 315M_DATA terminal is connected to a seventeenth resistor R17, which is connected to pin 7 of the control chip U4. The first surface mount crystal oscillator T2 is connected to pin 6 of the transmitting chip U3.

[0007] Specifically, the receiving circuit 1200 includes a second antenna T5, a receiving chip U2, a second surface-mount crystal oscillator T3, a third field-effect transistor Q3, a POWER_ON terminal, a 433M_DATA terminal, and a sixteenth resistor R16. The second antenna T5 is connected to the receiving chip U2. The second surface-mount crystal oscillator T3 is connected to pin 8 of the receiving chip U2. The drain of the third field-effect transistor Q3 is connected to pin 6 of the receiving chip U2. The gate of the third field-effect transistor Q3 is connected to the POWER_ON terminal. One end of the 433M_DATA terminal is connected to pin 5 of the receiving chip U2. The other end of the 433M_DATA terminal is connected to the sixteenth resistor R16. The sixteenth resistor R16 is connected to pin 4 of the control chip U4.

[0008] Specifically, pin 13 of the control chip U4 is connected to a USB plug circuit. The USB plug circuit includes a USB connector J1, a DC12V terminal, a first capacitor C1, a second diode D2, a third resistor R3, a first resistor R1, and a DC5V-DET terminal. The two ends of the first capacitor C1 are connected to pins 1 and 2 of the USB connector J1, respectively. The DC12V terminal is connected to the common terminal between the first capacitor C1 and pin 1 of the USB connector J1. The DC12V terminal is connected to the second diode D2. The second diode D2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the common terminal between the first resistor R1 and the DC5V-DET terminal. The DC5V-DET terminal is connected to pin 13 of the control chip U4.

[0009] Specifically, pin 12 of the control chip U4 is connected to a charging circuit 200. The charging circuit 200 includes a CHRG-IN terminal, a charging chip U1, a DC12V terminal, a second field-effect transistor Q2, a first inductor L1, a ninth resistor R9, and a second charging connector J2. The CHRG-IN terminal is connected to pin 3 of the charging chip U1. The DC12V terminal is connected to pin 9 of the charging chip U1 and the drain of the second field-effect transistor Q2. The gate of the second field-effect transistor Q2 is connected to pin 10 of the charging chip U1. Pins 7 and 8 of the charging chip U1 are connected to the two ends of the ninth resistor R9. The ninth resistor R9 is connected to the first inductor L1. The other end of the first inductor L1 is connected to the collector of the second field-effect transistor Q2. The ninth resistor R9 is connected to the second charging connector J2, and the second charging connector J2 is connected to a rechargeable battery.

[0010] Specifically, it also includes a BAT-AD voltage divider detection circuit 300, comprising a first field-effect transistor Q1, a twelfth resistor R12, an eleventh resistor R11, a ninth resistor R9, a fifth resistor R5, a BAT+ terminal, and a POWER-ON terminal. The gate (G) of the first field-effect transistor Q1 is connected to the ninth resistor R9 and the fifth resistor R5, respectively. The ninth resistor R9 is connected to the POWER-ON terminal, which is connected to pin 11 of the control chip U4. The drain (D) of the first field-effect transistor Q1, the twelfth resistor R12, the eleventh resistor R11, and the BAT+ terminal are connected in series. The common terminal of the twelfth resistor R12 and the eleventh resistor R11 is connected to a fourth capacitor C4 and a BAT-DET terminal, respectively. The BAT-DET terminal is connected to pin 10 of the control chip U4.

[0011] Specifically, it further includes a first power supply circuit 400 and a second power supply circuit 1000. The first power supply circuit 400 includes a second step-down chip IC2, a BAT+12V terminal and a VDD5V terminal. Pins 3 and 4 of the second step-down chip IC2 are connected to the VDD5V terminal, and the BAT+12V terminal is connected to pin 2 of the second step-down chip IC2. The second power supply circuit 1000 includes a first step-down chip IC1 and a 315_3V3 terminal. The 315_3V3 terminal is connected to pins 3 and 4 of the first step-down chip IC1. The BAT+12V terminal on the second step-down chip IC2 is connected to pin 2 of the first step-down chip IC1, and the VDD5V terminal is connected to pin 1 of the control chip U4.

[0012] Specifically, the auxiliary connection circuit 500 includes a VDD5V terminal, a FAN-ON / TCK terminal, a DIO terminal, and a third connector J3. The VDD5V terminal, the FAN-ON / TCK terminal, and the DIO terminal are respectively connected to the third connector J3. The DIO terminal is connected to pin 6 of the control chip U4, the FAN-ON / TCK terminal is connected to pin 5 of the control chip U4, and an exhaust fan is connected to the third connector J3.

[0013] It also includes an auxiliary circuit 600, which includes a second field-effect transistor Q2, a third diode D3, a DC12V terminal, a second resistor R2, a BAT+ terminal, and a BAT+12V terminal. The third diode D3 is connected to pin 3 of the second field-effect transistor Q2 and to the DC12V terminal. The DC12V terminal is connected to pin 1 of the second field-effect transistor Q2. Pin 1 of the second field-effect transistor Q2 is connected to the second resistor R2. The BAT+12V terminal is connected to the common terminal between pin 3 of the second field-effect transistor Q2 and the third diode D3. The BAT+12V terminal is connected to pin 2 of the first step-down chip IC1 on the second power supply circuit 1000.

[0014] Specifically, the control chip U4 is connected to a buzzer circuit 700. The buzzer circuit 700 includes a buzzer, a buzzer connector H1, a fourth transistor Q4, a twenty-third resistor R23, a VDD5V terminal, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and an SPK terminal. The buzzer is connected to the buzzer connector H1, the VDD5V terminal is connected to the twenty-third resistor R23, the twenty-third resistor R23 is connected to pin 1 of the buzzer connector H1, the SPK terminal is connected to the twenty-fourth resistor R24, one end of the twenty-fourth resistor R24 ​​is connected to the twenty-third resistor R23, the common terminal between the twenty-fourth resistor R24 ​​and the twenty-third resistor R23 is connected to the base of the fourth transistor Q4, the collector of the fourth transistor Q4 is connected to pin 2 of the buzzer connector H1, the VDD5V terminal is connected to pin 1 of the control chip U4, and the SPK terminal is connected to pin 16 of the control chip U4.

[0015] Specifically, the control chip U4 is connected to an indicator circuit, which includes an LEDR terminal, an LEDG terminal, a 21st resistor R21, a 20th resistor R20, and an LED group D5. The LEDR terminal is connected to the 21st resistor R21, and the LEDG terminal is connected to the 20th resistor R20. The other ends of the 21st resistor R21 and the 20th resistor R20 are respectively connected to pins 1 and 2 of the LED group D5.

[0016] This utility model discloses a device that uses the above-mentioned control device for forced natural gas discharge, including a housing and a control circuit disposed inside the housing.

[0017] Specifically, the housing includes a front housing and a back panel that are connected to each other. A battery and a control circuit are fixedly disposed on the front side wall of the back panel. The control circuit integrates a wiring terminal, a switch button, a pairing button, and a charging connector. The battery is placed on the control circuit, and the wiring terminal is used for electrical connection with the exhaust fan.

[0018] Specifically, the battery and control circuit are spaced apart on the left and right, and fixing clips are spaced apart on the front side wall of the back plate. An insertion fixing space is formed between the two fixing clips on the left and right, and the battery is fixedly inserted into the insertion fixing space.

[0019] Furthermore, the fixing clip has an elastic fixing part on the wall surface facing the battery.

[0020] Furthermore, the front surface of the front housing is provided with a mating button hole, and the switch button is movably disposed in the mating button hole.

[0021] Furthermore, the upper surface of the front housing is provided with a switch button hole and a terminal wiring hole, the wiring terminal is disposed in the terminal wiring hole, and the switch button extends outward through the switch button hole.

[0022] Specifically, a charging port is provided on the lower surface of the front housing, and the charging connector is disposed inside the charging port.

[0023] Furthermore, wall-mounting grooves are provided on the left and right sides of the rear side wall of the back panel.

[0024] Specifically, the back plate and the front housing are connected to each other using a snap-fit ​​structure.

[0025] Compared with the prior art, this utility model overcomes the core defects of the prior art, and the specific effects are as follows: I. Enhanced Remote Control and Safety Protection Capabilities: Through a dual-band wireless communication architecture, it supports remote alerts via smartphones, enabling immediate response to sudden gas leaks; the dual-band design avoids signal failure caused by interference from a single frequency band.

[0026] II. Multiple status feedback mechanisms: The buzzer circuit provides acoustic alarm; the LED indicator circuit displays the running / charging status in real time, ensuring that users can remotely monitor the equipment's operating status.

[0027] III. Flexible Deployment and Structural Innovation: The wall-mounted slot allows for quick installation, and the flexible fixing part enables tool-free battery installation and removal, solving the pain point of fixed position of traditional controllers; IV. Circuit-Mechanical Coordination Optimization: The wiring terminals support quick plugging and unplugging, adapting to different exhaust fan models; the independent charging connector and switch button are separated to avoid accidental operation.

[0028] V. Intelligent Power Management: The BAT-AD voltage divider detection circuit 300 monitors the battery voltage in real time and triggers low power protection through the control chip U4; the dual-stage power supply architecture (the first power supply circuit 400 steps down to 5V, and the second power supply circuit 1000 steps down to 3.3V) matches the voltage requirements of different chips and reduces energy consumption.

[0029] VI. Anti-interference design: The fourth diode in the fan control circuit prevents current backflow; the clock synchronization of each functional circuit is achieved through the first surface mount crystal oscillator T2 and the first surface mount crystal oscillator T3, which improves communication stability. Attached Figure Description

[0030] Figure 1 This is a circuit diagram of the USB plug of this utility model.

[0031] Figure 2 This is the charging circuit diagram of this utility model.

[0032] Figure 3 This is the circuit diagram of the BAT-AD voltage divider detection circuit of this utility model.

[0033] Figure 4 This is the first power supply circuit diagram of this utility model.

[0034] Figure 5 This is the auxiliary connection circuit diagram of this utility model.

[0035] Figure 6 This is the circuit diagram of the control chip of this utility model.

[0036] Figure 7 This is a circuit diagram of the charging auxiliary circuit of this utility model.

[0037] Figure 8 This is the circuit diagram of the buzzer of this utility model.

[0038] Figure 9 This is the fan control circuit diagram of this utility model.

[0039] Figure 10This is the indicator circuit diagram of this utility model.

[0040] Figure 11 This is the second power supply circuit diagram of this utility model.

[0041] Figure 12 This is the transmitting circuit diagram of this utility model.

[0042] Figure 13 This is the receiving circuit diagram of this utility model.

[0043] Figure 14 This is a schematic diagram of the shell structure of this utility model.

[0044] Figure 15 for Figure 14 A schematic diagram of the rear view structure.

[0045] Figure 16 for Figure 14 A schematic diagram of its decomposed structure.

[0046] The components are labeled as follows in the diagram: USB plug circuit 100, charging circuit 200, BAT-AD voltage divider detection circuit 300, first power supply circuit 400, auxiliary connection circuit 500, charging auxiliary circuit 600, buzzer circuit 700, fan control circuit 800, indicator circuit 900, second power supply circuit 1000, transmitting circuit 1100, receiving circuit 1200, housing 1300, front housing 1301, plug-in fixing space 1302, pairing button hole 1303, back plate 1304, wall mounting groove 1305, battery 1306, fixing clip 1307, wiring terminal 1308, switch button 1309, control circuit 1310, charging connector 1311, pairing button 1312, and elastic fixing part 1313. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] See Figures 1 to 13 A control circuit for protecting against natural gas leaks includes a control board, the control board further comprising: The control chip U4 has a button T1 connected to its 8th pin. Button T1 is used to start the control chip U4 and enable it to perform a switching function.

[0049] The fan control circuit 800 is connected to pin 9 of the control chip U4; the fan control circuit 800 controls the working state of the fan. The transmitting circuit 1100 and the receiving circuit 1200 are respectively connected to the control chip U4. The transmitting circuit 1100 and the receiving circuit 1200 are used to transmit signals and receive signals, respectively.

[0050] This circuit establishes a bidirectional data link with the smart terminal through a heterogeneous dual-band wireless communication architecture (i.e., the transmitting circuit 1100 operates in the 315MHz band / the receiving circuit 1200 operates in the 433MHz band). Specifically, the implementation is as follows: Remote control mechanism: The transmitting circuit 1100 transmits the status signal (including gas leak alarm code and equipment operating data) generated by the control chip U4 to the smart terminal via the first antenna T4; The receiving circuit 1200 acquires the control commands sent by the smart terminal through the second antenna T5, and feeds the control commands back to the input control chip U4; Safety linkage response: When the control system APP of the smart terminal (which is existing technology) issues an exhaust command, the control chip U4 drives the exhaust fan to start within ≤100ms through the fan control circuit 800; the measured communication distance is ≥50m (through wall environment), and the response delay is reduced by 98% compared with physical button control.

[0051] The following content further explains the circuit described above: like Figure 9 As shown, pin 9 of the control chip U4 in this circuit is connected to the fan control circuit 800. The fan control circuit 800 includes a fifth field-effect transistor Q5, a FAN_BEF terminal, a fourth diode D4, a fan connector J4, a FAN_ON / TCK terminal, a twenty-second resistor R22, a seventh capacitor C7, and a BAT+12V terminal. The FAN_BEF terminal is connected to the source (S) terminal of the fifth field-effect transistor Q5. The drain (D) terminal of the fifth field-effect transistor Q5 is connected to the fourth diode D4. The fourth diode D4 is connected to pin 1 of the fan connector J4. The fifth field-effect transistor Q5 is connected to the twenty-second resistor R22. The twenty-second resistor R22 is connected to the FAN_ON / TCK terminal. The FAN_BEF terminal is connected to pin 9 of the control chip U4. The FAN_ON / TCK terminal is connected to pin 5 of the control chip U4. The drain (D) terminal of the fifth field-effect transistor Q5 is connected to pin 2 of the fan connector J4. The fan connector J4 is connected to the fan. When the control chip U4 controls the gate (G) of the fifth field-effect transistor Q5 to conduct, a 12V power supply is applied to the fan connector J4, and the fan starts. The fourth diode D4 provides unidirectional conduction and, together with the seventh capacitor C7, increases overall stability.

[0052] like Figure 12As shown, the transmitting circuit 1100 includes a first antenna T4, a transmitting chip U3, a first surface-mount crystal oscillator T2, a 315_3V3 terminal, and a 315M_DATA terminal. The first antenna T4 is connected to pins 1, 2, and 3 of the transmitting chip U3. The 315_3V3 terminal is connected to pin 5 of the transmitting chip U3, and the 315M_DATA terminal is connected to pin 4 of the transmitting chip U3. A seventeenth resistor R17 is connected to the 315M_DATA terminal, and the seventeenth resistor R17 is connected to pin 7 of the control chip U4. The first surface-mount crystal oscillator T2 is connected to pin 6 of the transmitting chip U3. The function of the first surface-mount crystal oscillator T2 is to provide the basic clock signal for the system. Typically, a single crystal oscillator is shared by the entire system to facilitate synchronization. Some communication systems use different crystal oscillators for the baseband and radio frequency, maintaining synchronization through electronic frequency adjustment. The crystal oscillator is usually used in conjunction with a phase-locked loop (PLL) circuit to provide the required clock frequency for the system. The control chip U4 communicates with the smartphone's communication module through the transmitter chip U3, transmitting overall circuit usage status information. The first antenna T4 enables remote transmission.

[0053] like Figure 13 As shown, the receiving circuit 1200 includes a second antenna T5, a receiving chip U2, a second surface-mount crystal oscillator T3, a third field-effect transistor Q3, a POWER_ON terminal, a 433M_DATA terminal, and a sixteenth resistor R16. The second antenna T5 is connected to the receiving chip U2. The second surface-mount crystal oscillator T3 is connected to pin 8 of the receiving chip U2. The drain (D) of the third field-effect transistor Q3 is connected to pin 6 of the receiving chip U2, and the gate (G) of the third field-effect transistor Q3 is connected to the POWER_ON terminal. One end of the 433M_DATA terminal is connected to pin 5 of the receiving chip U2, and the other end of the 433M_DATA terminal is connected to the sixteenth resistor R16. The sixteenth resistor R16 is connected to pin 4 of the control chip U4. The function of the second surface-mount crystal oscillator T3 is to provide the basic clock signal for the system. Typically, a system shares a single crystal oscillator to facilitate synchronization between different parts. Some communication systems use different crystal oscillators for the baseband and radio frequency, maintaining synchronization through electronic frequency adjustment. Crystal oscillators are typically used in conjunction with phase-locked loop (PLL) circuits to provide the clock frequency required by the system. The second antenna T5 and receiver chip U2 work together to receive operating signals and communicate with the smartphone's communication module.

[0054] like Figure 1As shown, pin 13 of the control chip U4 in this circuit is connected to a USB plug circuit 100. The USB plug circuit 100 includes a USB connector J1, a DC 12V terminal, a first capacitor C1, a second diode D2, a third resistor R3, a first resistor R1, and a DC 5V-DET terminal. The two ends of the first capacitor C1 are connected to pins 1 and 2 of the USB connector J1, respectively. The DC 12V terminal is connected to the common terminal between the first capacitor C1 and pin 1 of the USB connector J1. The DC 12V terminal is connected to the second diode D2. The second diode D2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the common terminal between the first resistor R1 and the DC 5V-DET terminal. The DC 5V-DET terminal is connected to pin 13 of the control chip U4. The USB connector J1 is used to input 12V / 3.5A to power the charging circuit 200.

[0055] like Figure 2 As shown, pin 12 of the control chip U4 in this circuit is connected to a charging circuit 200. The charging circuit 200 includes a CHRG-IN terminal, a charging chip U1, a DC12V terminal, a second field-effect transistor Q2, a first inductor L1, a ninth resistor R9, and a second charging connector J2. The CHRG-IN terminal is connected to pin 3 of the charging chip U1. The DC12V terminal is connected to pin 9 of the charging chip U1 and the drain of the second field-effect transistor Q2. The gate of the second field-effect transistor Q2 is connected to pin 10 of the charging chip U1. Pins 7 and 8 of the charging chip U1 are connected to the two ends of the ninth resistor R9. The ninth resistor R9 is connected to the first inductor L1. The other end of the first inductor L1 is connected to the collector of the second field-effect transistor Q2. The ninth resistor R9 is connected to the second charging connector J2, and the second charging connector J2 is connected to a rechargeable battery. Charging chip U1 is connected to control chip U4, and control chip U4 controls the charging operation of charging chip U1. Charging chip U1 controls the second field-effect transistor Q2 to turn on or off, and the second charging connector J2 inputs 12V DC to the rechargeable battery. The rechargeable battery is used to supply power to the overall circuitry during normal operation.

[0056] like Figure 3As shown, this circuit also includes a BAT-AD voltage divider detection circuit 300, comprising a first field-effect transistor Q1, a twelfth resistor R12, an eleventh resistor R11, a ninth resistor R9, a fifth resistor R5, a BAT+ terminal, and a POWER-ON terminal. The gate (G) of the first field-effect transistor Q1 is connected to the ninth resistor R9 and the fifth resistor R5, respectively. The ninth resistor R9 is connected to the POWER-ON terminal, which is connected to pin 11 of the control chip U4. The drain (D) of the first field-effect transistor Q1, the twelfth resistor R12, the eleventh resistor R11, and the BAT+ terminal are connected in series. The common terminal of the twelfth resistor R12 and the eleventh resistor R11 is connected to a fourth capacitor C4 and a BAT-DET terminal, respectively. The BAT-DET terminal is connected to pin 10 of the control chip U4. The BAT+ terminal of the BAT-AD voltage divider detection circuit 300 detects the voltage of the second charging connector J2 on the charging circuit 200.

[0057] like Figure 4 and Figure 11 As shown, this circuit also includes a first power supply circuit 400 and a second power supply circuit 1000. The first power supply circuit 400 includes a second step-down chip IC2, a BAT+12V terminal, and a VDD5V terminal. Pins 3 and 4 of the second step-down chip IC2 are connected to the VDD5V terminal, and the BAT+12V terminal is connected to pin 2 of the second step-down chip IC2. The second power supply circuit 1000 includes a first step-down chip IC1 and a 315_3V3 terminal. The 315_3V3 terminal is connected to pins 3 and 4 of the first step-down chip IC1. The BAT+12V terminal on the second step-down chip IC2 is connected to pin 2 of the first step-down chip IC1, and the VDD5V terminal is connected to pin 1 of the control chip U4. The first power supply circuit 400 and the second power supply circuit 1000 can output two voltages, 5V and 12V, respectively, which are input to the corresponding circuits. For example, 5V is supplied to the control chip U4.

[0058] like Figure 5 As shown, the auxiliary connection circuit 500 of this circuit includes a VDD5V terminal, a FAN-ON / TCK terminal, a DIO terminal, and a third connector J3. The VDD5V terminal, the FAN-ON / TCK terminal, and the DIO terminal are respectively connected to the third connector J3. The DIO terminal is connected to pin 6 of the control chip U4, the FAN-ON / TCK terminal is connected to pin 5 of the control chip U4, and the third connector J3 is connected to an exhaust fan.

[0059] like Figure 2As shown, this circuit also includes an auxiliary circuit 600. The charging auxiliary circuit 600 includes a second field-effect transistor Q2, a third diode D3, a DC12V terminal, a second resistor R2, a BAT+ terminal, and a BAT+12V terminal. The third diode D3 is connected to pin 3 of the second field-effect transistor Q2 and to the DC12V terminal. The DC12V terminal is connected to pin 1 of the second field-effect transistor Q2. Pin 1 of the second field-effect transistor Q2 is connected to the second resistor R2. The BAT+12V terminal is connected to the common terminal between pin 3 of the second field-effect transistor Q2 and the third diode D3. The BAT+12V terminal is connected to pin 2 of the first step-down chip IC1 on the second power supply circuit 1000.

[0060] like Figure 8 As shown, the control chip U4 in this circuit is connected to a buzzer circuit 700. The buzzer circuit 700 includes a buzzer, a buzzer connector H1, a fourth transistor Q4, a twenty-third resistor R23, a VDD 5V terminal, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and an SPK terminal. The buzzer is connected to the buzzer connector H1, the VDD 5V terminal is connected to the twenty-third resistor R23, the twenty-third resistor R23 is connected to pin 1 of the buzzer connector H1, the SPK terminal is connected to the twenty-fourth resistor R24, one end of the twenty-fourth resistor R24 ​​is connected to the twenty-third resistor R23, the common terminal between the twenty-fourth resistor R24 ​​and the twenty-third resistor R23 is connected to the base of the fourth transistor Q4, the collector of the fourth transistor Q4 is connected to pin 2 of the buzzer connector H1, the VDD 5V terminal is connected to pin 1 of the control chip U4, and the SPK terminal is connected to pin 16 of the control chip U4. The buzzer circuit 700 serves as an audible alert.

[0061] like Figure 10 As shown, the control chip U4 in this circuit is connected to an indicator circuit 900. The indicator circuit 900 includes an LEDR terminal, an LEDG terminal, a 21st resistor R21, a 20th resistor R20, and an LED group D5. The LEDR terminal is connected to the 21st resistor R21, and the LEDG terminal is connected to the 20th resistor R20. The other ends of the 21st resistor R21 and the 20th resistor R20 are respectively connected to pins 1 and 2 of the LED group D5. The indicator circuit 900 serves as a visual cue.

[0062] like Figures 14 to 16 As shown, this utility model discloses a controller, including a housing 1300, and a control circuit disposed within the housing 1300. The control circuit includes the aforementioned control circuit for protecting against natural gas leaks. Furthermore, the housing 1300 allows the position of the exhaust fan controller to be adjusted according to the environment, providing an advantage in convenient installation.

[0063] Specifically, the housing 1300 includes a front housing 1301 and a back plate 1304 connected to each other. A battery 1306 and a control circuit 1310 are fixedly mounted on the front side wall of the back plate 1304. The control circuit 1310 integrates a terminal block 1308, a switch button 1309, a pairing button 1312, and a charging connector 1311. The battery 1306 is placed on the control circuit 1310. The terminal block 1308 is used for electrical connection with the exhaust fan. The terminal block 1308 allows for quick connection of the exhaust fan's power cord via a plug-in method, improving assembly and disassembly efficiency.

[0064] Specifically, the battery 1306 and the control circuit 1310 are arranged at intervals on the left and right sides, and fixing clips 1307 are arranged at intervals on the front side wall of the back plate 1304. An insertion fixing space 1302 is formed between the two fixing clips 1307 on the left and right sides, and the battery 1306 is fixedly inserted into the insertion fixing space 1302.

[0065] Specifically, the fixing clip 1307 has an elastic fixing part 1313 on its wall facing the battery 1306. The function of the elastic fixing part 1313 is to fully fit with the battery under the action of elastic deformation, and at the same time apply a force to the battery 1306, so that the battery 1306 is fixed in the insertion fixing space 1302, realizing screwless assembly. This facilitates assembly and makes it easy to disassemble and maintain later.

[0066] Specifically, the front surface of the front housing 1301 is provided with a mating button hole 1303, and the switch button 1309 is movably disposed in the mating button hole 1303.

[0067] Specifically, the upper surface of the front housing 1301 is provided with a switch button hole and a terminal wiring hole, the wiring terminal 1308 is disposed in the terminal wiring hole, and the switch button 1309 extends outward through the switch button hole.

[0068] Specifically, the lower surface of the front housing 1301 is provided with a charging port, and the charging connector 1311 is disposed inside the charging port.

[0069] Specifically, the back panel 1304 has wall-mounting grooves 1305 on its left and right sides on its rear side wall. The wall-mounting grooves 1305 allow for quick and easy insertion and engagement with wall-mounted nails for hanging, simplifying installation, reducing manual operation, and facilitating disassembly and maintenance. Furthermore, the back panel 1304 and the front housing 1301 are connected by a snap-fit ​​structure.

[0070] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

Claims

1. A control circuit for forced exhaust of natural gas, characterized in that: Including: Control chip U4, with button T1 connected to pin 8 of control chip U4; The fan control circuit (800) is connected to pin 9 of the control chip U4; The transmitting circuit (1100) and the receiving circuit (1200) are respectively connected to the control chip U4. The transmitting circuit (1100) and the receiving circuit (1200) are used to transmit signals and receive signals, respectively.

2. The control circuit for forced exhaust of natural gas according to claim 1, characterized in that: Pin 9 of the control chip U4 is connected to the fan control circuit (800). The fan control circuit (800) includes a fifth field-effect transistor Q5, a FAN_BEF terminal, a fourth diode D4, a fan connector J4, a FAN_ON / TCK terminal, a twenty-second resistor R22, a seventh capacitor C7, and a BAT+12V terminal. The FAN_BEF terminal is connected to the source (S) terminal of the fifth field-effect transistor Q5. The drain (D) terminal of the fifth field-effect transistor Q5 is connected to the fourth diode D4. The fourth diode D4 is connected to pin 1 of the fan connector J4. The fifth field-effect transistor Q5 is connected to the twenty-second resistor R22. The twenty-second resistor R22 is connected to the FAN_ON / TCK terminal. The FAN_BEF terminal is connected to pin 9 of the control chip U4. The FAN_ON / TCK terminal is connected to pin 5 of the control chip U4. The drain (D) terminal of the fifth field-effect transistor Q5 is connected to pin 2 of the fan connector J4. The fan connector J4 is connected to the fan.

3. A control circuit for forced exhaust of natural gas according to claim 1, characterized in that: The transmitting circuit (1100) includes a first antenna T4, a transmitting chip U3, a first surface mount crystal oscillator T2, a 315_3V3 terminal and a 315M_DATA terminal. The first antenna T4 is connected to pins 1, 2 and 3 of the transmitting chip U3. The 315_3V3 terminal is connected to pin 5 of the transmitting chip U3. The 315M_DATA terminal is connected to pin 4 of the transmitting chip U3. The 315M_DATA terminal is connected to a seventeenth resistor R17. The seventeenth resistor R17 is connected to pin 7 of the control chip U4. The first surface mount crystal oscillator T2 is connected to pin 6 of the transmitting chip U3.

4. A control circuit for forced exhaust of natural gas according to claim 1, characterized in that: The receiving circuit (1200) includes a second antenna T5, a receiving chip U2, a second surface-mount crystal oscillator T3, a third field-effect transistor Q3, a POWER_ON terminal, a 433M_DATA terminal, and a sixteenth resistor R16. The second antenna T5 is connected to the receiving chip U2. The second surface-mount crystal oscillator T3 is connected to pin 8 of the receiving chip U2. The drain of the third field-effect transistor Q3 is connected to pin 6 of the receiving chip U2. The gate of the third field-effect transistor Q3 is connected to the POWER_ON terminal. One end of the 433M_DATA terminal is connected to pin 5 of the receiving chip U2. The other end of the 433M_DATA terminal is connected to the sixteenth resistor R16. The sixteenth resistor R16 is connected to pin 4 of the control chip U4.

5. A control circuit for forced exhaust of natural gas according to claim 1, characterized in that: Pin 13 of the control chip U4 is connected to a USB plug circuit (100). The USB plug circuit (100) includes a USB connector J1, a DC 12V terminal, a first capacitor C1, a second diode D2, a third resistor R3, a first resistor R1, and a DC 5V-DET terminal. The two ends of the first capacitor C1 are connected to pins 1 and 2 of the USB connector J1, respectively. The DC 12V terminal is connected to the common terminal between the first capacitor C1 and pin 1 of the USB connector J1. The DC 12V terminal is connected to the second diode D2. The second diode D2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the first resistor R1 and the DC 5V-DET terminal. The common terminal between the terminals, the DC5V-DET terminal, is connected to pin 13 of the control chip U4. Pin 12 of the control chip U4 is connected to a charging circuit (200). The charging circuit (200) includes a CHRG-IN terminal, a charging chip U1, a DC12V terminal, a second field-effect transistor Q2, a first inductor L1, a ninth resistor R9, and a second charging connector J2. The CHRG-IN terminal is connected to pin 3 of the charging chip U1. The DC12V terminal is connected to pin 9 of the charging chip U1 and the drain of the second field-effect transistor Q2. The gate of the second field-effect transistor Q2 is connected to pin 10 of the charging chip U1. Pins 7 and 8 of the charging chip U1 are connected to the two terminals of the ninth resistor R9. The ninth resistor R9 is connected to the first inductor L1, and the other end of the first inductor L1 is connected to the collector of the second field-effect transistor Q2. The ninth resistor R9 is connected to the second charging connector J2, which is connected to a rechargeable battery. The circuit also includes a BAT-AD voltage divider detection circuit (300), comprising a first field-effect transistor Q1, a twelfth resistor R12, an eleventh resistor R11, a ninth resistor R9, a fifth resistor R5, a BAT+ terminal, and a POWER-ON terminal. The gate of the first field-effect transistor Q1 is connected to the ninth resistor R9 and the fifth resistor R5, respectively. The ninth resistor R9 is connected to the POWER-ON terminal, which is connected to pin 11 of the control chip U4. The first field-effect transistor Q1's drain, the twelfth resistor R12, the eleventh resistor R11, and the BAT+ terminal are connected in series. The common terminal of the twelfth resistor R12 and the eleventh resistor R11 is connected to the fourth capacitor C4 and the BAT-DET terminal, respectively. The BAT-DET terminal is connected to pin 10 of the control chip U4. It also includes a first power supply circuit (400) and a second power supply circuit (1000). The first power supply circuit (400) includes a second step-down chip IC2, a BAT+12V terminal, and a VDD5V terminal. Pins 3 and 4 of the second step-down chip IC2 are connected to the VDD5V terminal. The BAT+12V terminal is connected to pin 2 of the second step-down chip IC2.The second power supply circuit (1000) includes a first step-down chip IC1 and a 315_3V3 terminal. The 315_3V3 terminal is connected to pins 3 and 4 of the first step-down chip IC1. The BAT+12V terminal on the second step-down chip IC2 is connected to pin 2 of the first step-down chip IC1. The VDD5V terminal is connected to pin 1 of the control chip U4. It also includes an auxiliary connection circuit (500) including a VDD5V terminal, a FAN-ON / TCK terminal, a DIO terminal, and a third connector J3. The VDD5V terminal, FAN-ON / TCK terminal, and DIO terminal are respectively connected to the third connector J3. The DIO terminal is connected to pin 6 of the control chip U4. The FAN-ON / TCK terminal is connected to pin 5 of the control chip U4. An exhaust fan is connected to the third connector J3.

6. A control circuit for forced exhaust of natural gas according to claim 5, characterized in that: It also includes an auxiliary circuit (600), which includes a second field-effect transistor Q2, a third diode D3, a DC 12V terminal, a second resistor R2, a BAT+ terminal, and a BAT+12V terminal. The third diode D3 is connected to pin 3 of the second field-effect transistor Q2 and to the DC 12V terminal. The DC 12V terminal is connected to pin 1 of the second field-effect transistor Q2, and pin 1 of the second field-effect transistor Q2 is connected to the second resistor R2. The BAT+12V terminal is connected to the second field-effect transistor... The common terminal between pin 3 of transistor Q2 and the third diode D3, the BAT+12V terminal, is connected to pin 2 of the first step-down chip IC1 on the second power supply circuit (1000). The control chip U4 is connected to a buzzer circuit (700). The buzzer circuit (700) includes a buzzer, a buzzer connector H1, a fourth transistor Q4, a twenty-third resistor R23, a VDD 5V terminal, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and an SPK terminal. The buzzer is connected to the buzzer connector H1. The VDD5V terminal is connected to the 23rd resistor R23, which is connected to pin 1 of the buzzer connector H1. The SPK terminal is connected to the 24th resistor R24, one end of which is connected to the 23rd resistor R23. The common terminal between the 24th and 23rd resistors is connected to the base of the 4th transistor Q4. The collector of the 4th transistor Q4 is connected to pin 2 of the buzzer connector H1. The VDD5V terminal is connected to pin 1 of the control chip U4. On the pin, the SPK terminal is connected to pin 16 of the control chip U4. The control chip U4 is connected to an indicator circuit (900). The indicator circuit (900) includes an LEDR terminal, an LEDG terminal, a 21st resistor R21, a 20th resistor R20, and an LED group D5. The LEDR terminal is connected to the 21st resistor R21, and the LEDG terminal is connected to the 20th resistor R20. The other ends of the 21st resistor R21 and the 20th resistor R20 are respectively connected to pins 1 and 2 of the LED group D5.

7. An apparatus employing the control circuit as described in any one of claims 1 to 6, comprising a housing (1300), characterized in that: The housing (1300) contains a control circuit.

8. The apparatus according to claim 7, characterized in that: The housing (1300) includes a front housing (1301) and a back plate (1304) connected to each other. A battery (1306) and a control circuit (1310) are fixedly disposed on the front side wall of the back plate (1304). The control circuit (1310) integrates a terminal block (1308), a switch button (1309), a pairing button (1312), and a charging connector (1311). The battery (1306) is placed on the control circuit (1310). The terminal block (1308) is used for electrical connection with the exhaust fan.

9. The apparatus according to claim 8, characterized in that: The battery (1306) and the control circuit (1310) are arranged at intervals on the left and right. Fixing clips (1307) are arranged at intervals on the front side wall of the back plate (1304). An insertion fixing space (1302) is formed between the two fixing clips (1307) on the left and right. The battery (1306) is fixedly inserted into the insertion fixing space (1302).

10. The apparatus according to claim 9, characterized in that: The fixing clip (1307) has an elastic fixing part (1313) on the wall surface facing the battery (1306).

11. The apparatus according to claim 8, characterized in that: The front surface of the front housing (1301) is provided with a mating button hole (1303), and the switch button (1309) is movably disposed in the mating button hole (1303).

12. The apparatus according to claim 8, characterized in that: The upper surface of the front housing (1301) is provided with a switch button hole and a terminal wiring hole, the wiring terminal (1308) is disposed in the terminal wiring hole, and the switch button (1309) extends outward through the switch button hole.

13. The apparatus according to claim 8, characterized in that: The lower surface of the front housing (1301) is provided with a charging port, and the charging connector (1311) is disposed inside the charging port.

14. The apparatus according to claim 8, characterized in that: The back panel (1304) has wall-mounting grooves (1305) on the left and right sides of its rear side wall.

15. The apparatus according to claim 8, characterized in that: The back plate (1304) and the front housing (1301) are connected to each other by a snap-fit ​​structure.

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