Gas sensor booster circuit and device

Abstract

The utility model relates to the technical field of sensors, in particular to a gas sensor booster circuit and device.The gas sensor booster circuit comprises a booster unit and a cleaning unit, the booster unit is used for being connected with a gas sensor D1, the cleaning unit is also used for being connected with the gas sensor D1, and the cleaning unit is further connected with an output end AD; the boosting unit is used for adjusting voltage, the cleaning unit is used for rapidly reducing voltage, and the output end AD is used for being connected with an external signal receiving unit. The application has the effect of avoiding self oscillation of the gas sensor D1.

Description

Technical Field

[0001] The present application relates to the technical field of sensors, and in particular to a gas sensor boosting circuit and device. Background Art

[0002] With the development of electronic technology, various detection sensors have been widely developed and applied. The MQ-D1 normal temperature gas sensor has the characteristics of small size and low power consumption.

[0003] However, in practical applications, there is a problem of large self-oscillation. When self-oscillation occurs, the voltage output to the signal processing unit drops to zero volts, which means that the gas sensor cannot operate normally. Therefore, how to avoid self-oscillation of gas sensors has become an urgent problem to be solved. Utility Model Content

[0004] In order to avoid the self-oscillation of the gas sensor, the present application provides a gas sensor boost circuit and device.

[0005] In a first aspect, the present application provides a gas sensor boost circuit that adopts the following technical solution:

[0006] A gas sensor boost circuit includes a boost unit and a cleaning unit. The boost unit is used to connect to a gas sensor D1, and the cleaning unit is also used to connect to the gas sensor D1. The cleaning unit is also connected to an output terminal AD. The boost unit is used to adjust the voltage, the cleaning unit is used to quickly reduce the voltage, and the output terminal AD is used to connect to an external signal receiving unit.

[0007] By adopting this technical solution, the boost unit regulates the voltage, ensuring that the voltage at output terminal AD remains relatively stable, preventing gas sensor D1 from oscillating and causing the voltage at output terminal AD to drop to zero volts. The purge circuit rapidly reduces the voltage at output terminal AD when the circuit is initially powered on, allowing it to quickly reach a stable state.

[0008] Optionally, the boost unit includes a voltage stabilizing chip U1, a transistor Q6, a resistor R14, a resistor R15, a resistor R16, a resistor R18, a resistor R19, and a resistor R25. The input pin of the voltage stabilizing chip U1 is connected to the power supply end, the output pin of the voltage stabilizing chip U1 is used to connect one end of the gas sensor D1, the ground pin of the voltage stabilizing chip U1 is connected to the resistor R18, the other end of the resistor R18 is connected to the resistor R16, the other end of the resistor R16 is connected to the ground end, one end of the resistor R19 is connected to the input pin of the voltage stabilizing chip U1, and the other end of the resistor R19 is connected to the The output pin of the voltage stabilizing chip U1, one end of the resistor R15 is connected to the output pin of the voltage stabilizing chip U1, the other end of the resistor R15 is connected to the ground pin of the voltage stabilizing chip U1, one end of the resistor R14 is used to connect the other end of the gas sensor D1, the other end of the resistor R14 is connected to the base of the transistor Q6, the collector of the transistor Q6 is connected to the connection point of the resistor R16 and the resistor R18, the emitter of the transistor Q6 is connected to the ground end, one end of the resistor R25 is used to connect the other end of the gas sensor D1, and the other end of the resistor R25 is connected to the ground end.

[0009] By adopting the above technical solution, the output voltage of the voltage stabilizing chip U1 can be adjusted in real time according to the zero point AD value of the gas sensor D1, so that the voltage output at the output terminal AD remains stable, avoiding the problem of the gas sensor D1 oscillating itself and causing the voltage at the output terminal AD to drop to zero volts.

[0010] Optionally, the voltage stabilizing chip U1 is a chip of model 78M05.

[0011] Optionally, the cleaning unit includes a Zener diode D8 and a resistor R17, one end of the resistor R17 is connected to the output end AD, the other end of the resistor R17 is connected to the cathode end of the Zener diode D8, and the anode end of the Zener diode D8 is connected to the ground end.

[0012] By adopting the above technical solution, when the circuit starts to power on, a high voltage will appear at the output terminal AD. At this time, the voltage at the output terminal AD will exceed the reverse breakdown voltage of the Zener diode D8. At this time, the cleaning circuit is turned on, thereby quickly reducing the voltage at the output terminal AD, so that the output terminal AD can quickly reach a stable state.

[0013] Optionally, a resistor R5 is further included, and the resistor R5 is arranged between the resistor R17 and the output terminal AD.

[0014] In a second aspect, the present application provides a gas sensor pressure boosting device that adopts the following technical solution:

[0015] A gas sensor boosting device includes a gas sensor boosting circuit as described in the first aspect.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. The boost unit regulates the voltage to ensure that the voltage at the output terminal AD remains relatively stable, preventing the gas sensor D1 from oscillating and causing the voltage at the output terminal AD to drop to zero volts. The purge circuit quickly reduces the voltage at the output terminal AD when the circuit is first powered on, allowing the output terminal AD to quickly reach a stable state.

[0018] 2. When the circuit starts to power on, a high voltage will appear at the output terminal AD. At this time, the voltage at the output terminal AD will exceed the reverse breakdown voltage of the Zener diode D8. At this time, the cleaning circuit is turned on, thereby quickly reducing the voltage at the output terminal AD, so that the output terminal AD can quickly reach a stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a block diagram showing the connection of this embodiment.

[0020] Figure 2 2 is a schematic diagram showing the circuit connection of this embodiment.

[0021] Explanation of the accompanying drawings: 1. Boosting unit; 2. Cleaning unit. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-2 This application is described in further detail.

[0023] The embodiment of the present application discloses a gas sensor boost circuit. Figure 1 A gas sensor boost circuit includes a boost unit 1 and a cleaning unit 2. The boost unit 1 and the cleaning unit 2 are respectively connected to one end of the gas sensor D1. The end of the cleaning unit 2 connected to the gas sensor D1 is also connected to an output end AD, and the output end AD is used to connect to an external signal receiving unit.

[0024] By setting up a boost circuit, the voltage at the output terminal AD to which the gas sensor D1 is connected can be adjusted, reducing the possibility that the voltage at the output terminal AD drops to zero volts due to oscillation of the gas sensor D1, and avoiding the oscillation of the gas sensor D1 itself, that is, the normal operation of the gas sensor D1 can be ensured. In addition, the cleaning unit 2 can handle the situation where the voltage at AD is too high when power is first applied, and quickly reduce the voltage at the output terminal AD, so that the output terminal AD can quickly reach a stable state.

[0025] Reference Figure 2 The boost unit 1 includes a voltage regulator chip U1, a transistor Q6, a resistor R14, a resistor R15, a resistor R16, a resistor R18, a resistor R19, and a resistor R25. The input pin of the voltage regulator chip U1 is connected to the power supply end. The output pin of the voltage regulator chip U1 is used to connect one end of the gas sensor D1. The ground pin of the voltage regulator chip U1 is connected to the resistor R18. The other end of the resistor R18 is connected to the resistor R16. The other end of the resistor R16 is connected to the ground end. One end of the resistor R19 is connected to the input pin of the voltage regulator chip U1. The other end of the resistor R19 is connected to the ground end. Connected to the output pin of the voltage regulator chip U1, one end of the resistor R15 is connected to the output pin of the voltage regulator chip U1, and the other end of the resistor R15 is connected to the ground pin of the voltage regulator chip U1. One end of the resistor R14 is used to connect to the other end of the gas sensor D1, and the other end of the resistor R14 is connected to the base of the transistor Q6. The collector of the transistor Q6 is connected to the connection point of the resistor R16 and the resistor R18. The emitter of the transistor Q6 is connected to the ground end. One end of the resistor R25 is used to connect to the other end of the gas sensor D1, and the other end of the resistor R25 is connected to the ground end.

[0026] The voltage regulator chip U1 can be 78M05. The power supply terminal provides 12V voltage.

[0027] The voltage regulator chip U1 can make real-time adjustments based on the zero AD value of the gas sensor D1 to ensure that the output voltage at the output terminal AD remains at around 1V, thereby avoiding the problem of the gas sensor D1 oscillating itself and causing the voltage at the output terminal AD to drop to zero volts.

[0028] The cleaning unit 2 includes a Zener diode D8 and a resistor R17 , one end of the resistor R17 is connected to the output terminal AD, the other end of the resistor R17 is connected to the cathode end of the Zener diode D8 , and the anode end of the Zener diode D8 is connected to the ground end.

[0029] When the circuit is first powered on, the voltage at the output terminal AD is too high. At this time, the voltage at the output terminal AD exceeds the reverse breakdown voltage of the Zener diode D8. Therefore, the resistor R17 and the Zener diode D8 form a cleaning circuit, which can quickly reduce the voltage at the output terminal AD, thereby achieving the voltage at the output terminal AD quickly reaching a stable state.

[0030] A resistor R5 is further connected between the output terminal AD and the gas sensor D1.

[0031] The implementation principle of a gas sensor boost circuit according to an embodiment of the present application is as follows: A boost unit 1 is provided to automatically adjust the voltage at the output terminal AD, thereby preventing the voltage at the output terminal AD from dropping to zero and becoming unrecoverable due to oscillations of the gas sensor D1 itself, thereby enabling the normal operation of the gas sensor D1. A cleaning unit 2 is provided to rapidly reduce the voltage at the output terminal AD when the circuit is initially powered on, allowing the voltage at the output terminal AD to quickly reach a stable state.

[0032] An embodiment of the present application further discloses a gas sensor boosting device, which includes a gas sensor boosting circuit disclosed above.

[0033] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A gas sensor boost circuit, characterized in that: It includes a boost unit and a cleaning unit. The boost unit is used to connect to the gas sensor D1. The cleaning unit is also used to connect to the gas sensor D1. The cleaning unit is also connected to an output terminal AD. The boost unit is used to adjust the voltage. The cleaning unit is used to quickly reduce the voltage. The output terminal AD is used to connect to an external signal receiving unit. The boost unit includes a voltage stabilizing chip U1, a transistor Q6, a resistor R14, a resistor R15, a resistor R16, a resistor R18, a resistor R19, and a resistor R25. The input pin of the voltage stabilizing chip U1 is connected to the power supply end. The output pin of the voltage stabilizing chip U1 is used to connect one end of the gas sensor D1. The ground pin of the voltage stabilizing chip U1 is connected to the resistor R18. The other end of the resistor R18 is connected to the resistor R16. The other end of the resistor R16 is connected to the ground end. One end of the resistor R19 is connected to the input pin of the voltage stabilizing chip U1. The other end of the resistor R19 is connected to the voltage stabilizing chip The output pin of the chip U1, one end of the resistor R15 is connected to the output pin of the voltage regulator chip U1, and the other end of the resistor R15 is connected to the ground pin of the voltage regulator chip U1. One end of the resistor R14 is used to connect to the other end of the gas sensor D1, and the other end of the resistor R14 is connected to the base of the transistor Q6. The collector of the transistor Q6 is connected to the connection point of the resistor R16 and the resistor R18. The emitter of the transistor Q6 is connected to the ground terminal. One end of the resistor R25 is used to connect to the other end of the gas sensor D1, and the other end of the resistor R25 is connected to the ground terminal. The cleaning unit includes a Zener diode D8 and a resistor R17, one end of the resistor R17 is connected to the output terminal AD, the other end of the resistor R17 is connected to the cathode end of the Zener diode D8, and the anode end of the Zener diode D8 is connected to the ground end.

2. A gas sensor boost circuit according to claim 1, characterized in that: The voltage stabilizing chip U1 is a chip of model 78M05.

3. The gas sensor boost circuit according to claim 1, wherein: The device further includes a resistor R5 , which is arranged between the resistor R17 and the output terminal AD.

4. A gas sensor boosting device, characterized in that: The gas sensor boost circuit comprises the gas sensor boost circuit according to any one of claims 1 to 3.

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