CN211454771U - Combustible gas leakage detection circuit capable of preventing false alarm - Google Patents
Combustible gas leakage detection circuit capable of preventing false alarm Download PDFInfo
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- CN211454771U CN211454771U CN202020635929.2U CN202020635929U CN211454771U CN 211454771 U CN211454771 U CN 211454771U CN 202020635929 U CN202020635929 U CN 202020635929U CN 211454771 U CN211454771 U CN 211454771U
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Abstract
The utility model discloses a combustible gas leakage detection circuit capable of preventing false alarm, which comprises a false alarm prevention detection circuit module, an indicator light display circuit module and a combustible gas leakage state signal output circuit module which are respectively connected with a control unit U1; the false alarm prevention detection circuit module comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein the 3 rd pin and the 4 th pin of the gas sensor S1 are both connected with a power supply voltage, and the 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1. The utility model discloses on the basis that the gas detected, increase and prevent mistake and report to the police detection circuitry, accurately report to the gas leakage, prevent that the wrong report is alert to take place, make the user can accurately judge the gas leakage state.
Description
Technical Field
The utility model relates to a gas leakage detection circuit especially relates to a can prevent combustible gas leakage detection circuit of wrong report.
Background
Natural gas is a green energy source, and has been widely used in natural gas vehicles and home heating and cooking. When natural gas is used as a combustible gas energy source, once leakage occurs, if the leakage cannot be found in time, a fire accident can be caused, and property and life safety are harmed. The gas leakage alarm sold on the market at present can frequently generate the condition of no gas leakage and alarm in daily use, so that a user can not accurately distinguish whether gas is really leaked or not when the gas leakage alarm gives an alarm, and the user can accurately judge the gas leakage state.
Disclosure of Invention
The utility model provides a technical problem provide a can prevent combustible gas leakage detection circuitry of wrong report, on the basis that the gas detected, increase and prevent mistake report detection circuitry, accurately report to the gas leakage, prevent that the wrong report is alert to take place, make the user accurately judge the gas leakage state.
The utility model discloses a realize through following technical scheme:
a combustible gas leakage detection circuit capable of preventing false alarm comprises a false alarm prevention detection circuit module, an indicator lamp display circuit module and a combustible gas leakage state signal output circuit module which are respectively connected with a control unit U1;
the anti-false alarm detection circuit module comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein a 3 rd pin and a 4 th pin of the gas sensor S1 are both connected with a power supply voltage, a 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1, and a first voltage protection component is connected in parallel between the 1 st pin of the gas sensor S1 and a circuit ground; the 2 nd pin of the gas sensor S1 is connected with the PAD1 port of the control unit U1, and the 2 nd pin of the gas sensor S1 is also connected with the circuit ground through a second voltage protection component;
the VDD port of the control unit U1 is connected with a power supply voltage, and the PAD3 port of the control unit U1 is connected with an indicator lamp display circuit module; a PT0 port of the control unit U1 is connected with the combustible gas leakage state signal output circuit module; the PAD0 port and the VDD port of the control unit U1 are connected to circuit ground.
Further, the indicator light display circuit module comprises an indicator light LED1, the anode of the indicator light LED1 is connected with the supply voltage, and the cathode of the indicator light LED1 is connected with the PAD3 port of the control unit U1 through a resistor R6.
Further, the combustible gas leakage state signal output circuit module comprises a triode Q1 and a diode D1; the base electrode of the triode Q1 is connected with the PT0 port of the control unit U1 through a resistor R7, the collector electrode of the triode Q1 is respectively connected with the power supply voltage and the anode of the diode D1, and the cathode of the diode D1 is connected with the output end of the circuit; the emitter of transistor Q1 is connected to circuit ground.
Furthermore, a capacitor C5 and a resistor R4 and a resistor R5 which are connected in series are connected in parallel between the PAD0 port of the control unit U1 and the circuit ground, and a resistor R3 connected with the power supply voltage is connected in series between the resistor R4 and the resistor R5.
Further, the first voltage protection component is a capacitor C3 and a resistor R1 connected in parallel.
Further, the second voltage protection component is a capacitor C4 and a resistor R2 connected in parallel.
Further, the triode Q1 is an NPN triode.
Further, the collector of the transistor Q1 is connected to a supply voltage via a resistor R8.
Further, the VDD port of the control unit U1 is connected to circuit ground through a capacitor C1.
Further, the model of the gas sensor S1 is TGS 2611.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a combustible gas leakage detection circuit capable of preventing false alarm, which comprises a false alarm prevention detection circuit module, an indicator light display circuit module and a combustible gas leakage state signal output circuit module which are respectively connected with a control unit U1; the false alarm prevention detection circuit module comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein the 3 rd pin and the 4 th pin of the gas sensor S1 are both connected with a power supply voltage, and the 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1. The combustible gas leakage detection circuit capable of preventing false alarm adopts a 5V direct current power supply for power supply, and the combustible gas leakage state can be detected through the false alarm prevention detection circuit.
When the false alarm prevention detection circuit module starts to work, a 1 st pin and a 4 th pin of the gas sensor S1 are pins of the heating wires, and the heating wires are preheated within two minutes; after preheating is finished, the gas sensor S1 enters a normal working state, and when the concentration of indoor combustible gas rises, the resistance values of the 2 nd pin and the 3 rd pin of the gas sensor S1 are rapidly reduced, so that the voltage of the 2 nd pin of the gas sensor S1 is rapidly increased; the control unit U1 detects the voltage of the 2 nd pin of the gas sensor S1, the voltage of the 1 st pin of the gas sensor S1 and the power supply voltage, and after false alarm prevention judgment, the PT0 port of the control unit U1 outputs appointed leakage alarm information to the combustible gas leakage state signal output circuit module.
The utility model discloses set up between the control unit U1 and gas sensor S1 and prevent mistake and report detection circuitry, the control unit U1 is according to the port of being connected with preventing mistake and report detection circuitry module and judge the concrete gas leakage state that gas sensor surveyed. The control unit U1 detects the false alarm state and the current gas leakage state through AD sampling, and outputs a corresponding square wave signal, namely the gas leakage state, through a PT0 port after false alarm prevention judgment. The utility model discloses on the basis that the gas detected, increase and prevent mistake and report to the police detection circuitry, leak to the gas and carry out accurate warning, prevent the emergence of the wrong report condition, make the user accurately judge to the gas leakage state.
Drawings
FIG. 1 is a schematic block diagram of a combustible gas leakage detection circuit capable of preventing false alarm according to the present invention;
FIG. 2 is a circuit diagram of the combustible gas leakage detection circuit capable of preventing false alarm according to the present invention;
wherein, 1 is the false alarm prevention detection circuit module, 2 is the pilot lamp display circuit module, and 3 is combustible gas leakage state signal output circuit module.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are provided for purposes of illustration and not limitation.
Referring to fig. 1 and 2, a combustible gas leakage detection circuit capable of preventing false alarm comprises a false alarm prevention detection circuit module 1, an indicator lamp display circuit module 2 and a combustible gas leakage state signal output circuit module 3 which are respectively connected with a control unit U1;
the anti-false alarm detection circuit module 1 comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein a 3 rd pin and a 4 th pin of the gas sensor S1 are both connected with a power supply voltage, a 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1, and a first voltage protection component is connected in parallel between the 1 st pin of the gas sensor S1 and a circuit ground; the 2 nd pin of the gas sensor S1 is connected with the PAD1 port of the control unit U1, and the 2 nd pin of the gas sensor S1 is also connected with the circuit ground through a second voltage protection component;
the VDD port of the control unit U1 is connected with a power supply voltage, and the PAD3 port of the control unit U1 is connected with the indicator lamp display circuit module 2; a PT0 port of the control unit U1 is connected with the combustible gas leakage state signal output circuit module 3; the PAD0 port and the VDD port of the control unit U1 are connected to circuit ground.
Further, the indicator light display circuit module 2 includes an indicator light LED1, an anode of the indicator light LED1 is connected to the supply voltage, and a cathode of the indicator light LED1 is connected to the PAD3 port of the control unit U1 through a resistor R6.
Further, the combustible gas leakage state signal output circuit module 3 comprises a triode Q1 and a diode D1; the base electrode of the triode Q1 is connected with the PT0 port of the control unit U1 through a resistor R7, the collector electrode of the triode Q1 is respectively connected with the power supply voltage and the anode of the diode D1, and the cathode of the diode D1 is connected with the output end of the circuit; the emitter of transistor Q1 is connected to circuit ground.
Furthermore, a capacitor C5 and a resistor R4 and a resistor R5 which are connected in series are connected in parallel between the PAD0 port of the control unit U1 and the circuit ground, and a resistor R3 connected with the power supply voltage is connected in series between the resistor R4 and the resistor R5.
Further, the first voltage protection component is a capacitor C3 and a resistor R1 connected in parallel.
Further, the second voltage protection component is a capacitor C4 and a resistor R2 connected in parallel.
Specifically, the power supply voltage in the false alarm prevention gas leakage detection circuit adopts a 5V direct current power supply for supplying power, and the combustible gas leakage state is detected through a gas sensor S1; a combustible gas sensor heating wire detection circuit is formed by the control unit U1, the gas sensor S1, the resistor R1 and the capacitor C3 and is used for detecting the state of a combustible gas sensor heating wire; a power supply voltage detection circuit is formed by the control unit U1, the resistor R3, the resistor R4 and the resistor R5 and is used for detecting the accurate value of the current direct-current voltage; an indicator lamp display circuit is formed by the control unit U1, the indicator lamp LED1 and the resistor R6 and is used for displaying the specific states (including a starting state, a normal state, an abnormal state and an alarm state) of the current circuit; a combustible gas leakage state signal output circuit is formed by a control unit U1, a triode Q1, a diode D1, a resistor R7 and a resistor R8 and is used for being butted with other alarm display devices (such as a buzzer, a loudspeaker, a display screen and the like); wherein the combustible gas sensor heating wire detection circuit and the power supply voltage detection circuit jointly form a false alarm detection circuit.
Specifically, when the false alarm prevention gas leakage detection circuit starts to work, the 1 st pin and the 4 th pin of the gas sensor S1 are pins of heating wires, the heating wires are preheated within two minutes, and at the moment, the LED1 is displayed in a starting state. After preheating, gas sensor S1 gets into normal operating condition, LED1 shows normal condition this moment, when indoor combustible gas concentration rose, gas sensor S1 ' S2 nd pin and 3 rd pin resistance value reduce rapidly, make gas sensor S1 ' S2 nd pin voltage rise rapidly, the 2 nd pin voltage of control unit U1 detected gas sensor S1, the 1 st pin voltage and the supply voltage of S1, after preventing the false alarm judgement, when the result reached the alarm point, pilot lamp LED1 shows as alarm state, the appointed leakage alarm information of control unit U1 ' S PT0 port output is to combustible gas leakage state signal output circuit module 3.
The utility model discloses a can prevent combustible gas leakage detection circuit of wrong report, when combustible gas concentration reaches certain concentration, just can report to the police, can place circuit arrangement when the debugging and test the debugging in the combustible gas of inclosed appointed concentration, adjust the utility model discloses the critical point of warning of circuit. The utility model discloses the circuit is at normal during operation, when mains voltage is stable promptly, and critical alarm voltage can be judged according to gas sensor S1' S2 nd pin voltage to the 1 st pin magnitude of voltage of gas sensor S1 in normal range this moment, and warning signal is sent to the PT0 port of pilot lamp LED1 and the control unit U1 and the warning is reminded to the warning.
The utility model discloses a can prevent combustible gas leakage detection circuit of wrong report when the mains voltage value is beated near 5V, the 2 nd pin critical alarm voltage of gas sensor S1 can change along with voltage' S change, if do not prevent the mistake and report to the police when handling, will report to the police when concentration is less than or is higher than combustible gas alarm concentration, the utility model discloses the circuit is sampled to mains voltage, sets up different critical values in the control unit procedure through different mains voltage values, can solve the wrong report alarm that causes when mains voltage beats.
The utility model discloses a can prevent among the combustible gas leakage detection circuit of wrong report if gas sensor S1 because the heater strip damages, can lead to gas sensor S1 to the inaccurate detection of combustible gas concentration, in order to avoid this kind of condition, the utility model discloses the heating wire end and the resistance R1 series connection partial pressure of gas sensor S1 in the circuit can judge whether the combustible gas heater strip is worked at normal condition through detecting the 1 st pin voltage of gas sensor S1; if gas sensor S1 heater strip short circuit, then gas sensor S1 'S the 1 st pin voltage is mains voltage, if gas sensor S1 heater strip opens circuit, then gas sensor S1' S the 1 st pin voltage is 0V, the utility model discloses the 1 st pin voltage that the control unit U1 detected gas sensor S1 is 0V or is close mains voltage in the circuit. Similarly, when the control unit U1 detects that the voltage of the 2 nd pin of the gas sensor S1 is 0V or close to the power supply voltage, which indicates that the 3 rd pin and the 4 th pin of the gas sensor S1 are damaged, the indicator light LED1 and the PT0 port of the control unit U1 send signals to prompt an abnormal working state, so that the user can be reminded that the gas sensor S1 is out of work and is replaced in time. The false alarm and non-alarm caused by the abnormal gas sensor S1 can be solved.
Further, the triode Q1 is an NPN triode, and the withstand voltage value needs to be greater than the rated working voltage by 5V.
Further, the collector of the transistor Q1 is connected to a supply voltage via a resistor R8.
Further, the VDD port of the control unit U1 is connected to circuit ground through a capacitor C1.
Furthermore, the model of the gas sensor S1 is TGS2611, and the gas sensor has high sensitivity to natural gas such as formaldehyde and the like and low power consumption.
Specifically, the control unit U1 selects a supply voltage of 5V, and at least includes 3 AD sampling ports and 2 ordinary IO ports, where the PAD0 port, the PAD1 port, and the PAD2 port of the control unit U1 are all used as AD sampling ports, and the PAD3 port and the PT0 port of the control unit U1 are all used as ordinary IO ports. The capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the capacitor C5 are all 100nF patch capacitors, and are used for solving abnormal interference in a circuit and ensuring that the circuit works in a stable state.
The resistor R1, the resistor R2, the resistor R3 and the resistor R4 are voltage sampling resistors, and the precision requirement is within 1%. The resistance value of the resistor R1 is within 10 omega, so that the power of a heating wire of the gas sensor S1 is ensured, and the gas sensor S1 is ensured to be within a normal working range; the resistor R2 is subjected to model selection according to the specific model of the gas sensor S1, so that the sampling voltage precision is ensured; the resistors R3 and R4 are resistors with the same resistance value, and sampling precision is guaranteed.
It should be noted that the diode D1 uses a diode with a higher reverse voltage to prevent external high voltage from entering the circuit.
By the technical scheme, the utility model provides a combustible gas leakage detection circuit capable of preventing false alarm, which comprises a false alarm prevention detection circuit module 1, an indicator lamp display circuit module 2 and a combustible gas leakage state signal output circuit module 3 which are respectively connected with a control unit U1; the false alarm prevention detection circuit module 1 comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein a 3 rd pin and a 4 th pin of the gas sensor S1 are both connected with a power supply voltage, and a 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1. The combustible gas leakage detection circuit capable of preventing false alarm adopts a 5V direct current power supply for power supply, and the combustible gas leakage state can be detected through the false alarm prevention detection circuit.
When the false alarm prevention detection circuit module 1 starts to work, a 1 st pin and a 4 th pin of the gas sensor S1 are heating wire pins, and the heating wires are preheated within two minutes; after preheating is finished, the gas sensor S1 enters a normal working state, and when the concentration of indoor combustible gas rises, the resistance values of the 2 nd pin and the 3 rd pin of the gas sensor S1 are rapidly reduced, so that the voltage of the 2 nd pin of the gas sensor S1 is rapidly increased; the control unit U1 detects the voltage of the 2 nd pin of the gas sensor S1, the voltage of the 1 st pin of the gas sensor S1 and the power supply voltage, and after false alarm prevention judgment, the PT0 port of the control unit U1 outputs specified leakage alarm information to the combustible gas leakage state signal output circuit module 3.
The utility model discloses set up between the control unit U1 and gas sensor S1 and prevent mistake and report detection circuitry, the control unit U1 is according to the port of being connected with preventing mistake and report detection circuitry module and judge the concrete gas leakage state that gas sensor surveyed. The control unit U1 detects the false alarm state and the current gas leakage state through AD sampling, and outputs a corresponding square wave signal, namely the gas leakage state, through a PT0 port after false alarm prevention judgment. The utility model discloses on the basis that the gas detected, increase and prevent mistake and report to the police detection circuitry, leak to the gas and carry out accurate warning, prevent the emergence of the wrong report condition, make the user accurately judge to the gas leakage state.
The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.
Claims (10)
1. A combustible gas leakage detection circuit capable of preventing false alarm is characterized by comprising a false alarm prevention detection circuit module (1), an indicator lamp display circuit module (2) and a combustible gas leakage state signal output circuit module (3) which are respectively connected with a control unit U1;
the anti-false alarm detection circuit module (1) comprises a gas sensor S1 and a capacitor C2 which are connected in parallel, wherein a 3 rd pin and a 4 th pin of the gas sensor S1 are both connected with a power supply voltage, a 1 st pin of the gas sensor S1 is connected with a PAD2 port of a control unit U1, and a first voltage protection component is connected between the 1 st pin of the gas sensor S1 and a circuit ground in parallel; the 2 nd pin of the gas sensor S1 is connected with the PAD1 port of the control unit U1, and the 2 nd pin of the gas sensor S1 is also connected with the circuit ground through a second voltage protection component;
the VDD port of the control unit U1 is connected with a power supply voltage, and the PAD3 port of the control unit U1 is connected with an indicator lamp display circuit module (2); a PT0 port of the control unit U1 is connected with the combustible gas leakage state signal output circuit module (3); the PAD0 port and the VDD port of the control unit U1 are connected to circuit ground.
2. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the indicator light display circuit module (2) comprises an indicator light LED1, the anode of the indicator light LED1 is connected to the supply voltage, and the cathode of the indicator light LED1 is connected to the PAD3 port of the control unit U1 through a resistor R6.
3. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the combustible gas leakage state signal output circuit module (3) comprises a transistor Q1 and a diode D1; the base electrode of the triode Q1 is connected with the PT0 port of the control unit U1 through a resistor R7, the collector electrode of the triode Q1 is respectively connected with the power supply voltage and the anode of the diode D1, and the cathode of the diode D1 is connected with the output end of the circuit; the emitter of transistor Q1 is connected to circuit ground.
4. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein a capacitor C5 and a resistor R4 and a resistor R5 which are connected in series are connected in parallel between the PAD0 port of the control unit U1 and a circuit ground, and a resistor R3 connected to a supply voltage is connected in series between the resistor R4 and the resistor R5.
5. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the first voltage protection component is a capacitor C3 and a resistor R1 connected in parallel.
6. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the second voltage protection component is a capacitor C4 and a resistor R2 connected in parallel.
7. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 3, wherein the transistor Q1 is an NPN transistor.
8. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 3, wherein the collector of the transistor Q1 is connected to the supply voltage through a resistor R8.
9. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the VDD port of the control unit U1 is connected to circuit ground through a capacitor C1.
10. The combustible gas leakage detection circuit capable of preventing false alarm according to claim 1, wherein the model of the gas sensor S1 is TGS 2611.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020635929.2U CN211454771U (en) | 2020-04-24 | 2020-04-24 | Combustible gas leakage detection circuit capable of preventing false alarm |
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| CN202020635929.2U CN211454771U (en) | 2020-04-24 | 2020-04-24 | Combustible gas leakage detection circuit capable of preventing false alarm |
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| CN211454771U true CN211454771U (en) | 2020-09-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114495441A (en) * | 2022-01-07 | 2022-05-13 | 青岛黄海学院 | Combustible gas detector gas filling detection device and detection method |
| CN115497259A (en) * | 2022-11-17 | 2022-12-20 | 无锡优耐特能源科技有限公司 | Modular false alarm prevention combustible gas leakage alarm device |
-
2020
- 2020-04-24 CN CN202020635929.2U patent/CN211454771U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114495441A (en) * | 2022-01-07 | 2022-05-13 | 青岛黄海学院 | Combustible gas detector gas filling detection device and detection method |
| CN114495441B (en) * | 2022-01-07 | 2023-05-09 | 青岛黄海学院 | Gas filling detection device and detection method for combustible gas detector |
| CN115497259A (en) * | 2022-11-17 | 2022-12-20 | 无锡优耐特能源科技有限公司 | Modular false alarm prevention combustible gas leakage alarm device |
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