Detection execution circuit of carbon dioxide detector
By designing a carbon dioxide detector detection execution circuit including a control module, a power module, a key input detection module and a carbon dioxide sensor, the problem of the key input detection module in the prior art cannot operate under the control of the control module, and high-precision key detection is achieved.
Patent Information
- Application Number
- CN202421062097.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-16
AI Technical Summary
In the prior art, the key input detection module of the carbon dioxide detector cannot be operated under the control of the control module, resulting in low detection accuracy.
A carbon dioxide detector detection execution circuit including a control module, a power module, a key input detection module and a carbon dioxide sensor is designed. Through the cooperation of the power supply execution unit and the key switch driving unit, the operation of the key detection execution unit under the control module is realized, and the voltage change of the button being pressed is detected by the key detection chip, thereby improving the detection accuracy.
The key input detection module is implemented to operate under the control of the control module, which improves the detection accuracy and ensures the reliability and efficiency of key detection.
Smart Images
Figure CN222652935U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a detector detection circuit, in particular to a carbon dioxide detector detection execution circuit. Background Art
[0002] In the prior art, the carbon dioxide detector includes: a control module, a carbon dioxide sensor and a key input detection module. The control module is communicatively connected to the carbon dioxide sensor. The key input detection module includes: a manual press button, one end of the manual press button is grounded, and the manual press button is self-resetting, that is, when the manual press button is released, it automatically returns to the disconnected state. When the manual press button is pressed, as long as it is kept pressed, the manual press button can be kept in a closed state. The actual control input of the entire manual press button is 0 voltage value, and when the manual press button is in the disconnected state, the control module access is empty, non-0 voltage value, so that the control module can determine whether the manual press button is pressed.
[0003] In the above structure, although the control module can detect whether the manually pressed key is pressed, the detection accuracy is very low, and the key input detection module cannot operate under the control of the control module. Utility Model Content
[0004] The utility model provides a carbon dioxide detector detection execution circuit to solve the problem in the prior art that a key input detection module cannot be operated under the control of a control module.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] The utility model discloses a carbon dioxide detector detection execution circuit, comprising: a control module, a power module, a key input detection module and a carbon dioxide sensor; the power module comprises: a rechargeable battery, a battery charging unit and a power supply execution unit, the battery charging unit is connected to the rechargeable battery, the rechargeable battery connection column is connected to the output end of the power supply execution unit, the first output end of the power supply execution unit is connected to the voltage input end of the key input detection module, the second output end of the power supply execution unit is connected to the voltage input end of the control module, the third output end of the power supply execution unit is connected to the voltage input end of the carbon dioxide sensor, and the output end of the carbon dioxide sensor is connected to the first communication connection end of the control module; the key input detection module comprises: a key switch driving unit, a key detection execution unit and a key part, the control end of the key switch driving unit is connected to the first output end of the control module, the positive end of the key switch driving unit is the voltage input end of the key input detection module, the negative end of the key switch driving unit is grounded, the voltage output end of the key switch driving unit is connected to the voltage input end of the key detection execution unit, the input end of the key detection execution unit is connected to the key part, and the output end of the key detection execution unit is connected to the input end of the control module.
[0007] Preferably, the key switch driving unit includes: a resistor R9, a transistor Q4 and a resistor R10, one end of the resistor R10 is the positive terminal of the key switch driving unit, the other end of the resistor R10 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to one end of the resistor R9, the other end of the resistor R9 is the control end of the key switch driving unit, and the collector of the transistor Q4 is the voltage output end of the key switch driving unit.
[0008] Preferably, the key detection execution unit includes: a key detection chip U1, a capacitor C4, a resistor R11 and a capacitor C5. The key detection chip U1 adopts the SUM7323 model chip. The KEY end of the key detection chip U1 is the input end of the key detection execution unit. The KEY end of the key detection chip U1 is connected to the positive electrode of the capacitor C4, the negative electrode of the capacitor C4 is grounded, the VSS end of the key detection chip U1 is grounded, the OUT end of the key detection chip U1 is the output end of the key detection execution unit, the LS end of the key detection chip U1 is grounded, the SET end of the key detection chip U1 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the VDD end of the key detection chip U1. The VDD end of the key detection chip U1 is connected to the positive electrode of the capacitor C5, the negative electrode of the capacitor C5 is grounded, and the VDD end of the key detection chip U1 is the voltage input end of the key input detection module.
[0009] Preferably, the battery charging unit includes: a wiring assembly chip U2, an electrostatic diode D1, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, an electrolytic capacitor C6, a capacitor C7, a capacitor C8 and a charging management chip U3, the wiring assembly chip U2 is used to connect to an external charger, the GND pin of the wiring assembly chip U2 is grounded, the VCC pin of the wiring assembly chip U2 is connected to the USB-5V output terminal of the charger, the VCC pin of the wiring assembly chip U2 is grounded through the electrostatic diode D1, the CC1 pin of the wiring assembly chip U2 is grounded through the resistor R12, and the CC2 pin of the wiring assembly chip U2 is grounded through the resistor R13; the charging management chip U3 adopts a TP4056 model chip, and the charging The USB-5V output end of the device is connected to one end of resistor R15, the other end of resistor R15 is connected to the positive electrode of electrolytic capacitor C6, the VCC pin of charging management chip U3 and the CE pin of charging management chip U3, the EP pin and GND pin of charging management chip U3 are both grounded, the negative electrode of electrolytic capacitor C6 is connected to the TEMP pin of charging management chip U3, and the negative electrode of electrolytic capacitor C6 is grounded, the CHRG pin of charging management chip U3 is connected to the second output end of the control module, the BAT pin of charging management chip U3 is connected to the positive electrode of capacitor C7, the positive electrode of rechargeable battery and one end of resistor R16, the negative electrode of capacitor C7 is grounded, the other end of resistor R16 is connected to one end of resistor R17 and the positive electrode of capacitor C8, the other end of resistor R17 and the negative electrode of capacitor C8 are grounded.
[0010] Preferably, the power supply execution unit includes: a wiring voltage direct input module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module, a voltage stabilizing module, a first step-down voltage stabilizing module and a second step-down voltage stabilizing module; the positive pole of the rechargeable battery is connected to the positive pole of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to the USB-5V output end of the external charger; the negative pole of the first controllable switch module is connected to the positive pole of the second controllable switch module, and the negative pole of the second controllable switch module is the power supply output end; the positive pole of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form a plug-in output end, and the first current limiting module The input end is used to connect to the output end after USB plug-in; the control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive electrode of the third controllable switch module, and the output end of the third current limiting module is used to connect to the output end of the external key circuit; the negative electrode of the third controllable switch module is grounded, and the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the third output end of the control module; the output end of the second current limiting module is the first output end of the power supply execution unit; the negative electrode of the second controllable switch module is connected to the input end of the first buck voltage stabilizing module, and the output end of the first buck voltage stabilizing module is the second output end of the power supply execution unit; the negative electrode of the second controllable switch module is connected to the input end of the second buck voltage stabilizing module, and the output end of the second buck voltage stabilizing module is the third output end of the power supply execution unit.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] In the present application, firstly, a battery charging unit is designed to charge the rechargeable battery; then, the power supply execution unit is used to adjust the voltage output by the rechargeable battery to different voltages; finally, a key switch driving unit is designed to realize that the entire key detection execution unit is controlled to work only when the control module controls the key switch driving unit to be closed, thereby realizing that the key detection execution unit cooperates with the control module to operate under control, and the key detection execution unit is used to detect the voltage change after the key is pressed, so that the detection accuracy is higher.
[0013] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is the circuit diagram of the key switch drive unit in the carbon dioxide detector detection execution circuit.
[0015] Figure 2 This is a circuit diagram of the key detection execution unit and the key part in the carbon dioxide detector detection execution circuit.
[0016] Figure 3 Circuit diagram of the rechargeable battery and battery charging unit in the CO2 detector detection execution circuit.
[0017] Figure 4 This is the circuit diagram of the power supply execution unit in the carbon dioxide detector detection execution circuit. DETAILED DESCRIPTION
[0018] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods:
[0019] like Figures 1 to 4 As shown, the utility model discloses a carbon dioxide detector detection execution circuit, including: a control module, a power module, a key input detection module and a carbon dioxide sensor; the power module includes: a rechargeable battery, a battery charging unit and a power supply execution unit, the battery charging unit is connected to the rechargeable battery, the rechargeable battery connection column is connected to the output end of the power supply execution unit, the first output end of the power supply execution unit is connected to the voltage input end of the key input detection module, the second output end of the power supply execution unit is connected to the voltage input end of the control module, the third output end of the power supply execution unit is connected to the voltage input end of the carbon dioxide sensor, and the output end of the carbon dioxide sensor is connected to the first communication connection end of the control module; the key input detection module includes: a key switch driving unit, a key detection execution unit and a key part, the control end of the key switch driving unit is connected to the first output end of the control module, the positive end of the key switch driving unit is the voltage input end to the key input detection module, the negative end of the key switch driving unit is grounded, the voltage output end of the key switch driving unit is connected to the voltage input end of the key detection execution unit, the input end of the key detection execution unit is connected to the key part, and the output end of the key detection execution unit is connected to the input end of the control module.
[0020] The key switch driving unit includes: a resistor R9, a transistor Q4 and a resistor R10, one end of the resistor R10 is the positive terminal of the key switch driving unit, the other end of the resistor R10 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to one end of the resistor R9, the other end of the resistor R9 is the control end of the key switch driving unit, and the collector of the transistor Q4 is the voltage output end of the key switch driving unit. The transistor Q4 acts as a controllable switch, which is disconnected under the control of the control module.
[0021] The key detection execution unit includes: a key detection chip U1, a capacitor C4, a resistor R11 and a capacitor C5. The key detection chip U1 adopts the SUM7323 model chip. The KEY end of the key detection chip U1 is the input end of the key detection execution unit. The KEY end of the key detection chip U1 is connected to the positive electrode of the capacitor C4, the negative electrode of the capacitor C4 is grounded, the VSS end of the key detection chip U1 is grounded, the OUT end of the key detection chip U1 is the output end of the key detection execution unit, the LS end of the key detection chip U1 is grounded, the SET end of the key detection chip U1 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the VDD end of the key detection chip U1, the VDD end of the key detection chip U1 is connected to the positive electrode of the capacitor C5, the negative electrode of the capacitor C5 is grounded, and the VDD end of the key detection chip U1 is the voltage input end of the key input detection module. The key detection chip U1 detects the voltage change at the key part, and the transistor Q4 controls the circuit that supplies power to the key detection chip U1.
[0022] The battery charging unit includes: a wiring assembly chip U2, an electrostatic diode D1, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, an electrolytic capacitor C6, a capacitor C7, a capacitor C8 and a charging management chip U3. The wiring assembly chip U2 is used to connect to an external charger. The GND pin of the wiring assembly chip U2 is grounded. The VCC pin of the wiring assembly chip U2 is connected to the USB-5V output terminal of the charger. The VCC pin of the wiring assembly chip U2 is grounded through the electrostatic diode D1. The CC1 pin of the wiring assembly chip U2 is grounded through the resistor R12. The CC2 pin of the wiring assembly chip U2 is grounded through the resistor R13. The charging management chip U3 adopts the TP4056 model chip. The U pin of the charger The SB-5V output end is connected to one end of resistor R15, and the other end of resistor R15 is connected to the positive electrode of electrolytic capacitor C6, the VCC pin of charging management chip U3 and the CE pin of charging management chip U3. The EP pin and GND pin of charging management chip U3 are both grounded. The negative electrode of electrolytic capacitor C6 is connected to the TEMP pin of charging management chip U3, and the negative electrode of electrolytic capacitor C6 is grounded. The CHRG pin of charging management chip U3 is connected to the second output end of the control module. The BAT pin of charging management chip U3 is connected to the positive electrode of capacitor C7, the positive electrode of rechargeable battery and one end of resistor R16. The negative electrode of capacitor C7 is grounded. The other end of resistor R16 is connected to one end of resistor R17 and the positive electrode of capacitor C8. The other end of resistor R17 and the negative electrode of capacitor C8 are grounded. The wiring assembly chip U2 realizes the interface connection with the external charger. The charging management chip U3 controls the charging voltage of the rechargeable battery. The charging management chip U3 can operate under the control of the controller Mo Kui.
[0023] The power supply execution unit includes: a wiring voltage direct input module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module, a voltage stabilizing module, a first step-down voltage stabilizing module and a second step-down voltage stabilizing module; the positive electrode BATZ of the rechargeable battery is connected to the positive electrode of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to the USB-5V output end TYPV of the external charger; the negative electrode of the first controllable switch module is connected to the positive electrode of the second controllable switch module, and the negative electrode of the second controllable switch module is the power supply output end BATQB; the positive electrode of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form a plug-in output end USBON, and the input end of the first current limiting module is used to connect to The output terminal USBV after USB plug-in; the control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive pole of the third controllable switch module, and the output end of the third current limiting module is used to connect to the output end KEYOUT of the external key circuit; the negative pole of the third controllable switch module is grounded, and the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the third output end BATEN of the control module; the output end of the second current limiting module is the first output end of the power supply execution unit; the negative pole of the second controllable switch module is connected to the input end of the first buck voltage stabilizing module, and the output end of the first buck voltage stabilizing module (which converts the voltage into a standard 3.3v voltage) is the second output end of the power supply execution unit; the negative pole of the second controllable switch module is connected to the input end of the second buck voltage stabilizing module, and the output end of the second buck voltage stabilizing module is the third output end of the power supply execution unit.
[0024] The following functions are realized: First, when electricity is supplied from the wiring voltage direct input module, the MOS tube Q1 in the first controllable switch module is closed, and the input end of the wiring voltage direct input module is connected to the USB-5V output end of the external charger. The USB-5V output end of the external charger is the power supply at the TYP-C interface. When there is power supply at the TYP-C interface, the MOS tube Q1 is closed, and the source of the MOS tube Q1 has voltage output, thereby realizing voltage input to the positive pole of the second controllable switch module, thereby having the function of detecting whether the power supply at the TYP-C interface is normal. Second, when the external key circuit is pressed, the external key circuit outputs a low level. Since the control end of the second controllable switch module is connected to the positive electrode of the second controllable switch module through the load at the same time, the external key circuit needs to provide a low level to make the control end of the second controllable switch module have a lower voltage, so that the second controllable switch module is closed and powered on. When the second controllable switch module is powered on, the control module starts to work, the output end of the control module outputs a high level, the control end of the third controllable switch module is connected to the driving voltage, the third controllable switch module is closed and turned on, and at this time, the current flow condition is provided for the load between the negative electrode of the second controllable switch module and the control end of the second controllable switch module, that is: the control end of the second controllable switch module is also connected to the low voltage, so that the control end of the second controllable switch module always has a low voltage, even if the key in the external key circuit is disconnected, the second controllable switch module can also remain turned on under the control of the output end of the control module. Third, when the output end of the control module does not output a high level and when the key circuit does not output a low voltage, only when the USB is plugged into the TYP-C interface can the input end of the first current limiting module output a high voltage, so that the output end of the first current limiting module outputs a high level to the input end of the fourth current limiting module, the third controllable switch module is turned on, and the load between the control end and the negative electrode of the second controllable switch module can conduct current, thereby realizing automatic power supply after the USB is plugged in. Thus, a multi-control mode of automatic control after USB is plugged in, automatic control after the key in the key circuit is closed, and active control of the control module is realized, and the first current limiting module, the second current limiting module, the third current limiting module, and the fourth current limiting module are arranged between each other to avoid interference between different control modes, and ensure that all controls can realize the output voltage of the control power supply output end.
[0025] The output of the third current limiting module is connected to the output of a fifth current limiting module, and the input of the fifth current limiting module is connected to the signal input KEYIN of the control module. The signal input KEYIN of the control module is used to detect the output state of the key circuit to detect whether the key in the key circuit is closed.
[0026] The power supply output is connected to the input of the first buck regulator module, and the output of the first buck regulator module is used to connect to the voltage input of the control module. The operating voltage of the control module is 3.3v, but the voltage of the power supply output is not this voltage, and it is very likely to be 2.5v or other voltage values. Therefore, the first buck regulator module is designed to meet the operating voltage requirements of the control module.
[0027] The power supply output is connected to the input of the second buck regulator module, and the output of the second buck regulator module is used to connect to the voltage input of the carbon dioxide detection circuit. The working voltage of the carbon dioxide detection circuit is 5V, but the voltage of the power supply output is not this voltage, and it is very likely to be 2.5V or other voltage values. Therefore, the second buck regulator module is designed to meet the working voltage requirements of the carbon dioxide detection circuit.
[0028] The first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module and the fifth current limiting module all include: a current limiting diode, the anode of the current limiting diode is the input end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module, and the cathode of the current limiting diode is the output end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module. The characteristic of the current limiting diode that the current can only flow from the anode to the cathode is utilized, so that there is no interference between the input voltages of various control modes.
[0029] The wiring voltage direct input module includes: resistor R1 and resistor R2, one end of resistor R1 is the input end of the wiring voltage direct input module, the other end of resistor R1 is grounded through resistor R2, and the connection between resistor R1 and resistor R2 is the output end of the wiring voltage direct input module. Resistors R1 and R2 have the function of voltage division, so that the voltage can meet the working requirements of MOS tube Q1 after connection.
[0030] The first controllable switch module includes: a MOS tube Q1 and a capacitor C1, wherein the gate of the MOS tube Q1 is the control end of the first controllable switch module, the drain of the MOS tube Q1 is the positive electrode of the first controllable switch module, the source of the MOS tube Q1 is the negative electrode of the first controllable switch module, the drain of the MOS tube Q1 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded. The capacitor C1 has the function of voltage stabilization.
[0031] The second controllable switch module includes: MOS tube Q2, capacitor C2, electrolytic capacitor C3 and resistor R8, the gate of MOS tube Q2 is the control end of the second controllable switch module, the drain of MOS tube Q2 is the positive electrode of the second controllable switch module, the source of MOS tube Q2 is the negative electrode of the second controllable switch module, the drain of MOS tube Q2 is connected to the positive electrode of capacitor C2, the negative electrode of capacitor C2 is grounded, the source of MOS tube Q2 is connected to the positive electrode of electrolytic capacitor C3, and the negative electrode of electrolytic capacitor C3 is grounded. Capacitor C1 and electrolytic capacitor C3 both have the function of voltage stabilization. Resistor R8 is the load between the negative electrode and the control end of the second controllable switch module.
[0032] The third controllable switch module includes: a transistor Q3 and a resistor R3, one end of the resistor R3 is the positive electrode of the third controllable switch module, the other end of the resistor R3 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is the negative electrode of the third controllable switch module, and the base of the transistor Q3 is the control end of the third controllable switch module.
[0033] The cathode of the current limiting diode in the fifth current limiting module is connected to the output end of the third current limiting module through a resistor R7.
[0034] The anode of the current limiting diode in the fourth current limiting module is connected to one end of the resistor R6, and the other end of the resistor R6 is grounded.
[0035] The voltage stabilizing module includes: a resistor R4 and a resistor R5, one end of the resistor R4 is connected to the plug output terminal USBON, the other end of the resistor R4 is connected to the control end of the third controllable switch module and one end of the resistor R5, and the other end of the resistor R5 is grounded.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. Carbon dioxide detector detection execution circuit, characterized in that: include: Control module, power module, key input detection module and carbon dioxide sensor; The power supply module includes: a rechargeable battery, a battery charging unit and a power supply execution unit, the battery charging unit is connected to the rechargeable battery, the rechargeable battery connection column is connected to the output end of the power supply execution unit, the first output end of the power supply execution unit is connected to the voltage input end of the key input detection module, the second output end of the power supply execution unit is connected to the voltage input end of the control module, the third output end of the power supply execution unit is connected to the voltage input end of the carbon dioxide sensor, and the output end of the carbon dioxide sensor is connected to the first communication connection end of the control module; The key input detection module includes: a key switch driving unit, a key detection execution unit and a key part, the control end of the key switch driving unit is connected to the first output end of the control module, the positive end of the key switch driving unit is the voltage input end to the key input detection module, the negative end of the key switch driving unit is grounded, the voltage output end of the key switch driving unit is connected to the voltage input end of the key detection execution unit, the input end of the key detection execution unit is connected to the key part, and the output end of the key detection execution unit is connected to the input end of the control module.
2. The carbon dioxide detector detection execution circuit according to claim 1, characterized in that: The key switch driving unit includes: a resistor R9, a transistor Q4 and a resistor R10, one end of the resistor R10 is the positive terminal of the key switch driving unit, the other end of the resistor R10 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to one end of the resistor R9, the other end of the resistor R9 is the control end of the key switch driving unit, and the collector of the transistor Q4 is the voltage output end of the key switch driving unit.
3. The carbon dioxide detector detection execution circuit according to claim 2, characterized in that: The key detection execution unit includes: a key detection chip U1, a capacitor C4, a resistor R11 and a capacitor C5. The key detection chip U1 adopts the SUM7323 model chip. The KEY end of the key detection chip U1 is the input end of the key detection execution unit. The KEY end of the key detection chip U1 is connected to the positive electrode of the capacitor C4, the negative electrode of the capacitor C4 is grounded, the VSS end of the key detection chip U1 is grounded, the OUT end of the key detection chip U1 is the output end of the key detection execution unit, the LS end of the key detection chip U1 is grounded, the SET end of the key detection chip U1 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the VDD end of the key detection chip U1. The VDD end of the key detection chip U1 is connected to the positive electrode of the capacitor C5, the negative electrode of the capacitor C5 is grounded, and the VDD end of the key detection chip U1 is the voltage input end of the key input detection module.
4. The carbon dioxide detector detection execution circuit according to claim 3, characterized in that: The battery charging unit includes: a wiring assembly chip U2, an electrostatic diode D1, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, an electrolytic capacitor C6, a capacitor C7, a capacitor C8 and a charging management chip U3. The wiring assembly chip U2 is used to connect to an external charger. The GND pin of the wiring assembly chip U2 is grounded. The VCC pin of the wiring assembly chip U2 is connected to the USB-5V output terminal of the external charger. The VCC pin of the wiring assembly chip U2 is grounded through the electrostatic diode D1. The CC1 pin of the wiring assembly chip U2 is grounded through the resistor R12. The CC2 pin of the wiring assembly chip U2 is grounded through the resistor R13. The charging management chip U3 adopts the TP4056 model chip. The charger's The USB-5V output end is connected to one end of resistor R15, and the other end of resistor R15 is connected to the positive electrode of electrolytic capacitor C6, the VCC pin of charging management chip U3 and the CE pin of charging management chip U3. The EP pin and GND pin of charging management chip U3 are both grounded. The negative electrode of electrolytic capacitor C6 is connected to the TEMP pin of charging management chip U3, and the negative electrode of electrolytic capacitor C6 is grounded. The CHRG pin of charging management chip U3 is connected to the second output end of the control module. The BAT pin of charging management chip U3 is connected to the positive electrode of capacitor C7, the positive electrode of rechargeable battery and one end of resistor R16. The negative electrode of capacitor C7 is grounded. The other end of resistor R16 is connected to one end of resistor R17 and the positive electrode of capacitor C8. The other end of resistor R17 and the negative electrode of capacitor C8 are grounded.
5. The carbon dioxide detector detection execution circuit according to claim 4, characterized in that: The power supply execution unit includes: a wiring voltage direct-in module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module, a voltage stabilizing module, a first voltage step-down stabilizing module and a second voltage step-down stabilizing module; The positive electrode of the rechargeable battery is connected to the positive electrode of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to the USB-5V output end of the external charger; The cathode of the first controllable switch module is connected to the anode of the second controllable switch module, and the cathode of the second controllable switch module is the power supply output terminal; The positive electrode of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form a plug-in output end, and the input end of the first current limiting module is used to connect to the output end after the USB plug-in; The control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive electrode of the third controllable switch module, and the output end of the third current limiting module is used to connect to the output end of the external key circuit; The negative electrode of the third controllable switch module is grounded, the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the third output end of the control module; The output end of the second current limiting module is the first output end of the power supply execution unit; The negative electrode of the second controllable switch module is connected to the input end of the first buck voltage stabilizing module, and the output end of the first buck voltage stabilizing module is the second output end of the power supply execution unit; The cathode of the second controllable switch module is connected to the input end of the second buck and voltage stabilizing module, and the output end of the second buck and voltage stabilizing module is the third output end of the power supply execution unit.