CN213399909U - Novel smoke alarm - Google Patents
Novel smoke alarm Download PDFInfo
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- CN213399909U CN213399909U CN202022112155.8U CN202022112155U CN213399909U CN 213399909 U CN213399909 U CN 213399909U CN 202022112155 U CN202022112155 U CN 202022112155U CN 213399909 U CN213399909 U CN 213399909U
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- 239000000779 smoke Substances 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims abstract description 9
- 230000009977 dual effect Effects 0.000 claims description 37
- 238000007599 discharging Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 235000019504 cigarettes Nutrition 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001089723 Metaphycus omega Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model relates to a novel smoke alarm, include: the device comprises a power supply circuit, a detection circuit and a timing alarm output circuit; the power supply in the power circuit is stepped down by a power transformer, rectified by a bridge rectifier circuit, filtered by a capacitor and then supplied to a three-terminal voltage stabilizer; double operational amplifier IC in timing alarm output circuit1Dual operational amplifier IC before flipping1The output terminal of (1) outputs a low level. The utility model has the advantages that: the utility model discloses a 6V power can be added the transformer power supply by 220V commercial power, equally also can be supplied power by battery or dry battery, has compensatied 9V power and 3V power not enough, and at scalability, it is intelligent should beHas certain advantages in use. The utility model discloses mainly adopt QM-N10 gas sensor, two fortune to put LM358 for the main component, constitute power supply circuit, amplifier circuit, detection circuitry and voltage comparison circuit. The alarm has simple circuit, less used elements and low cost.
Description
Technical Field
The utility model relates to a smog warning field especially includes a domestic smog warning trigger device based on integrated fortune is put.
Background
Home smoke alarm systems have tended to mature over the last twenty years of development since the 90 s of the last century. Due to the reduction in cost and the need for fire and gas leakage protection in the home. The main objects to which home smoke alarm systems are developed and researched are transitioning from enterprise users to home users. The independent smoke alarm chip powered by 9V voltage in the current market has high power consumption, and batteries are not easy to replace. The 3V programmable photoelectric smoke sensor in the market integrates smoke detection and boosting driving functions, has lower energy consumption and longer service life, has programmable calibration and multiple working modes, but cannot meet the requirements of the change of the industry standard and the market expansibility due to single function and limited expandability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the deficiencies in the prior art and providing a novel smoke alarm.
This novel smoke alarm includes: the device comprises a power supply circuit, a detection circuit and a timing alarm output circuit; the power supply in the power circuit is stepped down by a power transformer, rectified by a bridge rectifier circuit, filtered by a capacitor and then supplied to a three-terminal voltage stabilizer; double operational amplifier IC in timing alarm output circuit1Dual operational amplifier IC before flipping1Output terminal of the first transistor outputs a low level, dual operational amplifier IC2Output high level, triode VT1In a state to be conducted, the triode VT2In a conducting state; when the gas sensor in the detection circuit detects the smoke of the surrounding environment, the resistance between the A end and the B end of the gas sensor is rapidly reduced, and the double operational amplifier IC in the timing alarm output circuit1Double operational amplifier IC with increased input voltage at positive input terminal1Turning over to make the triode VT1And triode VT2Simultaneously conducting and outputting an alarm signal; when the dual operational amplifier IC1After overturning, rheostat Rp2And a capacitor C1The timer is started when the capacitor C is started1When charged to a threshold potential, the dual operational amplifier IC2Flip, dual operational amplifier IC2Output low level enable triode VT2Turning off and stopping outputting the alarm signal; when the environmental smoke disappears, the dual operational amplifier IC1And dual operational amplifier IC2All reset, capacitance C1By means of a rheostat Rp2Two-way operational amplifier IC1Discharge and adjustNode rheostat Rp2The resistance value changes the length of the alarm signal and adjusts the rheostat Rp1Change dual operational amplifier IC1The threshold voltage of the control circuit, the smoke concentration when triggering an alarm.
Preferably, the device for outputting the alarm signal is a buzzer or a light emitting device.
Preferably, the power supply circuit includes a power supply, a bridge rectifier circuit, and a capacitor C2And a three terminal regulator; the detection circuit comprises a gas sensor and a resistor R1Rheostat Rp1Resistance R2Capacitor C3Resistance R3Capacitor C4And a resistance R4(ii) a The timing alarm output circuit comprises a triode VT3Resistance R5Dual operational amplifier IC1Rheostat Rp2Capacitor C1Resistance R7Resistance R6Dual operational amplifier IC2Resistance R8Resistance R9Triode VT1Triode VT2Resistance R10And a speaker BL.
Preferably, the method comprises the following steps:
the power supply is connected with the bridge rectifier circuit, and the branch circuits of the power supply and the bridge rectifier circuit and the capacitor C2After the branches are connected in parallel, the anode is connected to the input end of the three-terminal voltage stabilizer, and the cathode is grounded; the grounding end of the three-terminal voltage stabilizer is grounded, and the output end of the three-terminal voltage stabilizer is divided into seven paths which are respectively connected to the anode and the resistor R of the gas sensor4One terminal of (1), triode VT3Collector, dual operational amplifier IC1The inverting input terminal and the resistor R of6One-terminal, dual operational amplifier IC2And the positive pole of the speaker BL;
negative electrode access resistor R of gas sensor1One terminal of (1), resistance R1The other end of the first and second electrodes is grounded; the gas-sensitive tube A of the gas-sensitive sensor is connected with the anode of the gas-sensitive sensor; resistance R4The other end of the resistor is respectively connected into a resistor R in two paths3And a transistor VT3Base electrode of (3), resistor R3The other end of the resistor is respectively connected into a resistor R in two paths2And a capacitor C4Positive electrode of (2), resistance R2The other end of the rheostat is divided into four paths to be respectively connected to the end B of a gas sensitive tube of the gas sensor and the rheostat Rp1One of the fixed contacts, the varistor Rp1Moving contact and capacitor C3The positive electrode of (1); rheostat Rp1Another fixed contact of, a capacitor C3Negative electrode of (1), and capacitor C4The cathodes of the two are all grounded;
triode VT3The two paths of the emission level are respectively connected into a resistor R5One terminal and dual operational amplifier IC1The non-inverting input terminal of (1); resistance R5And a dual operational amplifier IC1The non-inverting input ends of the two-way switch are grounded; rheostat Rp2After the movable contact and another fixed contact are connected, they are respectively connected into two paths and respectively connected into double operational amplifier IC1An output terminal and an inverting input terminal; rheostat Rp2The other fixed contact is respectively connected into the capacitor C in two paths1Positive electrode and dual operational amplifier IC2Non-inverting input terminal of, capacitor C1The negative electrode of (2) is grounded; resistance R6The other end of the first switch is respectively connected into a double operational amplifier IC by two paths2And the resistor R7One terminal of (1), resistance R7The other end of the first and second electrodes is grounded; dual operational amplifier IC2The non-inverting input terminal of the transformer is grounded; dual operational amplifier IC2Output terminal of the switch-in resistor R8One terminal of (1), resistance R8The other end of the transistor VT is connected to1A base electrode of (1); dual operational amplifier IC1Output terminal of the switch-in resistor R9One terminal of (1), resistance R9The other end of the transistor VT is connected to2A base electrode of (1);
negative electrode of loudspeaker BL is connected into triode VT1Collector of (2), triode VT1Emitter of the transistor is connected into the triode VT2Collector of (2), triode VT2Emitter-connected resistor R10One terminal of (1), resistance R10And the other end of the same is grounded.
Preferably, the power supply is 220V mains supply plus a transformer power supply, a storage battery or a dry battery.
Preferably, the gas sensor is a QM-N10 gas sensor.
Preferably, the dual operational amplifier IC1And dual operational amplifier IC2Are both dual operational amplifiers LM 358.
Preferably, the bridge rectifier circuit is composed of four diodes VD1～VD4And (4) forming.
Preferably, the three terminal regulator is model 7806.
Preferably, the triode VT1Model number 9018, triode VT2Model number 9014, triode VT3Is 9014.
The utility model has the advantages that: the utility model discloses a 6V power can add the transformer power supply by 220V commercial power, equally also can be supplied power by battery or dry battery, has compensatied not enough of 9V power and 3V power, and at scalability, certain advantage has in the aspect of intelligent application. The utility model discloses mainly adopt QM-N10 gas sensor, two fortune to put LM358 for the main component, constitute power supply circuit, amplifier circuit, detection circuitry and voltage comparison circuit. The alarm has simple circuit, less used elements and low cost.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, the present invention can be modified in several ways without departing from the principle of the present invention, and these modifications and modifications also fall into the protection scope of the claims of the present invention.
The utility model discloses an adopt the 6V power, can add the transformer power supply by the 220V commercial power, equally also can be supplied power by battery or dry battery, compensate 9V power and 3V power not enough, in scalability, have certain advantage in the aspect of intelligent application. The utility model discloses mainly adopt QM-N10 gas sensor, two fortune to put LM358 for the main component, constitute power supply circuit, amplifier circuit, detection circuitry and voltage comparison circuit. The alarm has simple circuit, less used elements and low cost.
As an embodiment, a novel smoke alarm comprises: the device comprises a power circuit (220V mains supply and a transformer power supply), a detection circuit and a timing alarm output circuit; the power circuit comprises a power supply, a bridge rectifier circuit, and a capacitor C2(220 muf, 25V) and a three terminal regulator (7806); the detection circuit comprises a gas sensor (QM-N10 type), a resistor R1(5.1 K.OMEGA.), rheostat Rp1(100 K.OMEGA.), resistance R2(1 K.OMEGA.), capacitor C3(100pF,25V), resistance R3(1 K.OMEGA.), capacitor C4(4.7. mu.F, 25V) and resistance R4(2K Ω); the timing alarm output circuit comprises a triode VT3(9014) Resistance R5(3K omega) dual operational amplifier IC1(LM358), rheostat Rp2(1 M.OMEGA.), capacitor C1(100pF,25V), resistance R7(100 K.OMEGA.), resistance R6(68K) Dual operational amplifier IC2(LM358), resistance R8(1K) Resistance R9(1K) Triode VT1(9018) Triode VT2(9014) Resistance R10(1K Ω) and a speaker BL.
A schematic diagram of a smoke alarm circuit is shown in figure 1. The whole circuit is divided into three parts of power supply, detection and timing alarm output. The power supply part reduces 220V commercial power to 10V through a power transformer and comprises four diodes VD1～VD4The bridge rectifier circuit is rectified and passes through a capacitor C2Filtered and supplied to a three terminal regulator 7806. The 6V DC power required by the whole circuit is supplied by a three-terminal regulator 7806.
The resistance between the A end and the B end of the QM-N10 type gas sensitive tube is dozens of kilohms in a smokeless environment, and the resistance value can be reduced to several kilohms in a smog environment. In the circuit, an operational amplifier IC is integrated1Circuit and IC2The formed circuits are all voltage comparator circuits. When the gas sensitive tube works, once the gas sensitive tube detects that smoke exists in the surrounding environment, the resistance between the A end and the B end is rapidly reduced, and the integrated operational amplifier IC used as a comparator1The input voltage at the positive input terminal is increased, and the comparator IC1It will quickly flip over and turn on transistor VT 2. In the comparator IC1Roll-overFront, IC1Output low level to make integrated operational amplifier IC2Output high level to make the triode VT1Is in a state to be conducted. When IC1After flipping, VT1And VT2And then the switch-on is carried out at the same time, and the output end can output an alarm signal. The output end can be connected with a buzzer or a light-emitting device. IC (integrated circuit)1After turning over, the rheostat Rp2And a capacitor C1The composed timer starts to operate. When the capacitance C1When charged to a threshold potential, the IC2Flip over, output low level to VT1And (5) turning off and stopping outputting the alarm signal. When the smoke disappears, the comparator is reset, and the capacitor C1By Rp2To IC1And (4) discharging. Altering Rp2The resistance value of the alarm signal can change the length of the alarm signal. By adjusting potentiometer Rp1Changeable voltage comparator IC1I.e. adjusting the smoke concentration when an alarm is required.
The mounting of the circuit shown in fig. 1 is done on a universal circuit board. The 12V alternating current is realized by a 220V commercial power plus transformer and can also be provided by an alternating current power supply. In practical application, the power supply part in the circuit can be replaced by a storage battery or a dry battery.
The detection is performed by replacing the smoke produced in the fire with a lit cigarette. And (4) checking whether the smoke alarm acts normally, and laterally placing the gas-sensitive element to control the smoke concentration by enabling the ignited cigarette to be far away from the gas-sensitive element. And to check how to adjust the sensitivity of smoke detection. We adjust the potentiometer Rp1And Rp2Finally, the circuit alarms when 0.5 m away from the lighted cigarette, and automatically stops after 2 minutes of alarm.
Claims (8)
1. A novel smoke alarm, comprising: the device comprises a power supply circuit, a detection circuit and a timing alarm output circuit;
the power supply in the power circuit is stepped down by a power transformer, rectified by a bridge rectifier circuit, filtered by a capacitor and then supplied to a three-terminal voltage stabilizer; the power circuit comprises a power supply, a bridge rectifier circuit, and a capacitor C2And a three terminal regulator; the detection circuit comprising a gas-sensitive sensorDevice, resistance R1Rheostat Rp1Resistance R2Capacitor C3Resistance R3Capacitor C4And a resistance R4(ii) a The timing alarm output circuit comprises a triode VT3Resistance R5Dual operational amplifier IC1Rheostat Rp2Capacitor C1Resistance R7Resistance R6Dual operational amplifier IC2Resistance R8Resistance R9Triode VT1Triode VT2Resistance R10And a speaker BL; the power supply is connected with the bridge rectifier circuit, and the branch circuits of the power supply and the bridge rectifier circuit and the capacitor C2After the branches are connected in parallel, the anode is connected to the input end of the three-terminal voltage stabilizer, and the cathode is grounded; the grounding end of the three-terminal voltage stabilizer is grounded, and the output end of the three-terminal voltage stabilizer is divided into seven paths which are respectively connected to the anode and the resistor R of the gas sensor4One terminal of (1), triode VT3Collector, dual operational amplifier IC1The inverting input terminal and the resistor R of6One-terminal, dual operational amplifier IC2And the positive pole of the speaker BL;
negative electrode access resistor R of gas sensor1One terminal of (1), resistance R1The other end of the first and second electrodes is grounded; the gas-sensitive tube A of the gas-sensitive sensor is connected with the anode of the gas-sensitive sensor; resistance R4The other end of the resistor is respectively connected into a resistor R in two paths3And a transistor VT3Base electrode of (3), resistor R3The other end of the resistor is respectively connected into a resistor R in two paths2And a capacitor C4Positive electrode of (2), resistance R2The other end of the rheostat is divided into four paths to be respectively connected to the end B of a gas sensitive tube of the gas sensor and the rheostat Rp1One of the fixed contacts, the varistor Rp1Moving contact and capacitor C3The positive electrode of (1); rheostat Rp1Another fixed contact of, a capacitor C3Negative electrode of (1), and capacitor C4The cathodes of the two are all grounded;
triode VT3The two paths of the emission level are respectively connected into a resistor R5One terminal and dual operational amplifier IC1The non-inverting input terminal of (1); resistance R5Another end of and a pairOperational amplifier IC1The non-inverting input ends of the two-way switch are grounded; rheostat Rp2After the movable contact and another fixed contact are connected, they are respectively connected into two paths and respectively connected into double operational amplifier IC1An output terminal and an inverting input terminal; rheostat Rp2The other fixed contact is respectively connected into the capacitor C in two paths1Positive electrode and dual operational amplifier IC2Non-inverting input terminal of, capacitor C1The negative electrode of (2) is grounded; resistance R6The other end of the first switch is respectively connected into a double operational amplifier IC by two paths2And the resistor R7One terminal of (1), resistance R7The other end of the first and second electrodes is grounded; dual operational amplifier IC2The non-inverting input terminal of the transformer is grounded; dual operational amplifier IC2Output terminal of the switch-in resistor R8One terminal of (1), resistance R8The other end of the transistor VT is connected to1A base electrode of (1); dual operational amplifier IC1Output terminal of the switch-in resistor R9One terminal of (1), resistance R9The other end of the transistor VT is connected to2A base electrode of (1);
negative electrode of loudspeaker BL is connected into triode VT1Collector of (2), triode VT1Emitter of the transistor is connected into the triode VT2Collector of (2), triode VT2Emitter-connected resistor R10One terminal of (1), resistance R10The other end of the first and second electrodes is grounded;
double operational amplifier IC in timing alarm output circuit1Dual operational amplifier IC before flipping1Output terminal of the first transistor outputs a low level, dual operational amplifier IC2Output high level, triode VT1In a state to be conducted, the triode VT2In a conducting state;
when the gas sensor in the detection circuit detects the smoke of the surrounding environment, the resistance between the A end and the B end of the gas sensor is rapidly reduced, and the double operational amplifier IC in the timing alarm output circuit1Double operational amplifier IC with increased input voltage at positive input terminal1Turning over to make the triode VT1And triode VT2Simultaneously conducting and outputting an alarm signal;
when the dual operational amplifier IC1After overturning, rheostat Rp2And a capacitorC1The timer is started when the capacitor C is started1When charged to a threshold potential, the dual operational amplifier IC2Flip, dual operational amplifier IC2Output low level enable triode VT2Turning off and stopping outputting the alarm signal;
when the environmental smoke disappears, the dual operational amplifier IC1And dual operational amplifier IC2All reset, capacitance C1By means of a rheostat Rp2Two-way operational amplifier IC1Discharging and regulating rheostat Rp2The resistance value changes the length of the alarm signal and adjusts the rheostat Rp1Change dual operational amplifier IC1The threshold voltage of the control circuit, the smoke concentration when triggering an alarm.
2. The novel smoke alarm of claim 1, wherein: the device for outputting the alarm signal is a buzzer or a light-emitting device.
3. The novel smoke alarm of claim 1, wherein: the power supply is 220V commercial power and a transformer power supply, a storage battery or a dry battery.
4. The novel smoke alarm of claim 1, wherein: the gas sensor is a QM-N10 gas sensor.
5. The novel smoke alarm of claim 1, wherein: dual operational amplifier IC1And dual operational amplifier IC2Are both dual operational amplifiers LM 358.
6. The novel smoke alarm of claim 1, wherein: the bridge rectifier circuit is composed of four diodes VD1～VD4And (4) forming.
7. The novel smoke alarm of claim 1, wherein: the three-terminal regulator is 7806 in model.
8. The novel smoke alarm of claim 1, wherein: triode VT1Model number 9018, triode VT2Model number 9014, triode VT3Is 9014.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022112155.8U CN213399909U (en) | 2020-09-23 | 2020-09-23 | Novel smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022112155.8U CN213399909U (en) | 2020-09-23 | 2020-09-23 | Novel smoke alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213399909U true CN213399909U (en) | 2021-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022112155.8U Expired - Fee Related CN213399909U (en) | 2020-09-23 | 2020-09-23 | Novel smoke alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213399909U (en) |
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2020
- 2020-09-23 CN CN202022112155.8U patent/CN213399909U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210608 Termination date: 20210923 |
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| CF01 | Termination of patent right due to non-payment of annual fee |