CN216486722U - Smoke detection circuit and smoke alarm - Google Patents
Smoke detection circuit and smoke alarm Download PDFInfo
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- CN216486722U CN216486722U CN202122995623.5U CN202122995623U CN216486722U CN 216486722 U CN216486722 U CN 216486722U CN 202122995623 U CN202122995623 U CN 202122995623U CN 216486722 U CN216486722 U CN 216486722U
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- 239000000779 smoke Substances 0.000 title claims abstract description 78
- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The utility model relates to a smoke detection circuit, comprising: the device comprises a first transmitting tube, a second transmitting tube, a receiving tube and a processor; the first transmitting tube, the second transmitting tube and the receiving tube are respectively in communication connection with the processor; the first emission tube is used for radiating laser with a first preset wavelength; the second transmitting tube is used for radiating laser with a second preset wavelength; the receiving tube is used for receiving the first preset wavelength laser and/or the second preset wavelength laser; the processor is used for respectively obtaining a first light quantity value and a second light quantity value which characterize the laser received by the receiving tube and determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value. Compared with the traditional photoelectric smoke detection circuit, the smoke detection circuit is additionally provided with a group of transmitting tubes, and the photoelectric smoke detection circuit with double transmitting tubes and single receiving tubes is constructed, so that the recognition of black smoke is enhanced, and the false alarm rate of detection is reduced. In addition, a smoke alarm is also proposed.
Description
Technical Field
The utility model relates to the field of photoelectric smoke detection, in particular to a smoke detection circuit and a smoke alarm.
Background
The smoke detection circuit of the traditional photoelectric smoke detector consists of a group of transmitting tubes and a group of receiving tubes, and a single-transmitting and single-receiving mode is limited by the physical principle of the smoke detection circuit, so that smoke and non-smoke particles cannot be accurately distinguished, and the phenomenon of false alarm is easy to occur.
Meanwhile, the traditional photoelectric smoke detection circuit has low sensitivity to black smoke detection, and cannot accurately and timely detect black smoke.
Therefore, how to solve the above problems that false alarm is easy to occur and black smoke cannot be detected accurately and timely is a problem that needs to be solved urgently.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, it is an object of the present application to provide a smoke detection circuit comprising:
the device comprises a first transmitting tube, a second transmitting tube, a receiving tube and a processor; the first transmitting tube, the second transmitting tube and the receiving tube are respectively in communication connection with the processor;
the first emission tube is used for radiating laser with a first preset wavelength;
the second transmitting tube is used for radiating laser with a second preset wavelength;
the receiving tube is used for receiving the first preset wavelength laser and/or the second preset wavelength laser;
the processor is used for respectively obtaining a first light quantity value and a second light quantity value which characterize the laser received by the receiving tube and determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.
Compared with the traditional photoelectric smoke detection circuit, the smoke detection circuit is additionally provided with a group of transmitting tubes to form a double-transmitting single-receiving photoelectric smoke detection circuit, so that the recognition of black smoke is enhanced, and the false detection rate is reduced; meanwhile, the transmitting tube constant current driving circuit and the receiving tube signal processing circuit are integrated, so that the number of peripheral elements is very small, the anti-interference capability of the circuit is improved, and the production cost is greatly reduced.
In one embodiment, further comprising:
and the alarm module is connected with the processor and used for receiving and responding to the alarm signal.
In one embodiment, the alarm module includes a buzzer and an LED indicator.
In one embodiment, further comprising:
the temperature detection module is connected with the processor and used for detecting the ambient temperature;
the processor performs temperature compensation on the smoke detection circuit according to the ambient temperature.
In one embodiment, further comprising:
and the power supply module is respectively connected with the first transmitting tube, the second transmitting tube, the receiving tube and the processor and is used for providing electric energy.
In one embodiment, further comprising:
and the key test module is connected with the processor and used for providing a test function.
In one embodiment, the first laser with the preset wavelength is the same as the second laser with the preset wavelength and is infrared light.
Based on the same inventive concept, the application also provides a smoke alarm which comprises the smoke detection circuit of any one of the preceding claims.
The smoke alarm comprises the smoke detection circuit, and compared with the traditional photoelectric smoke detection circuit, the smoke detection circuit is additionally provided with a group of transmitting tubes to form a double-transmitting single-receiving photoelectric smoke detection circuit, so that the recognition of black smoke is enhanced, and the false detection rate is reduced; meanwhile, the transmitting tube constant current driving circuit and the receiving tube signal processing circuit are integrated, so that the number of peripheral elements is very small, the anti-interference capability of the circuit is improved, and the production cost is greatly reduced.
Drawings
FIG. 1 is a block diagram of a smoke detection circuit in one embodiment;
fig. 2 is a schematic diagram of a smoke detection circuit in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As mentioned in the background art, the smoke detection circuit of the conventional photoelectric smoke detector is composed of a group of transmitting tubes and a group of receiving tubes, and the single-transmitting and single-receiving mode is limited by the physical principle thereof, so that smoke and non-smoke particles cannot be accurately distinguished, and the false alarm phenomenon is easy to occur. Meanwhile, the traditional photoelectric smoke detection circuit has low sensitivity to black smoke detection, and cannot accurately and timely detect black smoke.
In view of the above, it is desirable to provide a new solution to solve the above-mentioned technical problems, and the specific structure thereof will be described in detail in the following embodiments.
Referring to fig. 1, a smoke detection circuit provided by the present application may include:
a first transmitting tube 110, a second transmitting tube 112, a receiving tube 120 and a processor 200; the first transmitting tube 110, the second transmitting tube 112 and the receiving tube 120 are respectively connected to the processor 200 in a communication manner;
the first emitting tube 110 is used for emitting laser with a first preset wavelength;
the second emission tube 112 is used for radiating laser with a second preset wavelength;
specifically, the first preset wavelength laser and the second preset wavelength laser are the same and are both infrared light.
The receiving tube 120 is configured to receive the laser with the first preset wavelength and/or the laser with the second preset wavelength;
the processor 200 is configured to obtain a first light quantity value and a second light quantity value respectively representing the laser light received by the receiving tube 120, and determine whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.
Compared with the traditional photoelectric smoke detection circuit, the smoke detection circuit is additionally provided with a group of transmitting tubes to form a double-transmitting single-receiving photoelectric smoke detection circuit, so that the recognition of black smoke is enhanced, and the false detection rate is reduced; meanwhile, the transmitting tube constant current driving circuit and the receiving tube signal processing circuit are integrated, so that the number of peripheral elements is very small, the anti-interference capability of the circuit is improved, and the production cost is greatly reduced.
In one embodiment, with continuing reference to fig. 1, the smoke detection circuit of the present application may further comprise:
an alarm module 300, connected to the processor 200, for receiving and responding to the alarm signal.
Further, the alarm module 300 may include a buzzer and an LED indicator. Accordingly, the alarm signal is also an audible and/or light signal.
In one embodiment, with continuing reference to fig. 1, the smoke detection circuit of the present application may further comprise:
and a power module 400, connected to the first transmitting tube 110, the second transmitting tube 112, the receiving tube 120 and the processor 200, respectively, for providing power.
In one embodiment, with continuing reference to fig. 1, the smoke detection circuit of the present application may further comprise:
a temperature detection module 500 connected to the processor 200 for detecting an ambient temperature;
the processor 200 temperature compensates the smoke detection circuit according to the ambient temperature.
In one embodiment, with continuing reference to fig. 1, the smoke detection circuit of the present application may further comprise:
and a key test module 600 connected to the processor 200 for providing a test function. The test function may be, for example, a self test.
Based on the same inventive concept, the application also provides a smoke alarm which comprises the smoke detection circuit of any one of the preceding claims.
The smoke alarm comprises the smoke detection circuit, and compared with the traditional photoelectric smoke detection circuit, the smoke detection circuit is additionally provided with a group of transmitting tubes to form a double-transmitting single-receiving photoelectric smoke detection circuit, so that the recognition of black smoke is enhanced, and the false detection rate is reduced; meanwhile, the transmitting tube constant current driving circuit and the receiving tube signal processing circuit are integrated, so that the number of peripheral elements is very small, the anti-interference capability of the circuit is improved, and the production cost is greatly reduced.
Reference is now made to fig. 2, which is a schematic circuit diagram of a smoke detection circuit according to the present application. The smoke detection circuit of the application comprises a power supply module 400, a transmitting and receiving part (a first transmitting tube 110, a second transmitting tube 112 and a receiving tube 120), an alarm module 300, a temperature detection module 500, a key test module 600 and a processor 200. The processor 200 is an asic, and may be, for example: BA45F5220, BA45F5240, BA45F5250, BA45F5260, the LED of this series of integrated circuits inside all contains two-way irritates the current generator and smoke and feels signal processing circuit.
The power module 400 consists of Q1, R1, R3, C1, C2, C3; the Q1 and the R1 form a power supply reverse connection prevention circuit to prevent the circuit from being damaged when the battery is reversely connected; the R3, the C1, the C2 and the C3 form an RC filter circuit, so that power supply noise is filtered, and the anti-interference capability is enhanced; in addition, the chip is integrated with a battery voltage detection function, and whether the battery is low-voltage or not can be judged directly through the VDD voltage.
The transmitting and receiving part mainly comprises R2, C4, IR1, IR2 and PD; the large-capacity energy storage capacitor C2 can provide continuous and stable current for infrared emission current; the first emitting tube IR1 and the second emitting tube IR2 are directly connected with an ISINK0 pin and an ISINK1 pin of the processor 200, and the processor 200 directly drives an internal current-charging generator to control the periodic light emission of the infrared emitting tube; the receiving tube PD is directly connected to the AOPI pin and the AONI pin of the processor, and after the receiving tube PD receives the infrared light signals of the first transmitting tube IR1 and the second transmitting tube IR2, the generated photocurrent directly enters the processor 200 through the AOPI pin and the AONI pin to amplify and process the signals.
The testing button S1 in the button testing module 600 is directly connected to the I/O pin of the processor 200, and when the button S1 is pressed, the pin of the processor 200 receives a low level, and performs a self-test operation in a standby state, and performs a mute operation in a smoke alarm state.
The alarm module 300 mainly comprises R4, Q2, L1, BUZZ, D1 and R6; when the product is self-checked and alarmed, the processor 200 directly controls the output circuit through the I/O pin to output an alarm sound and an LED indicator.
The temperature detection module 500 consists of NTC, R5 and C5; when the temperature of the temperature environment changes, the NTC impedance changes, and the voltage information obtained by dividing the NTC and the R5 is directly input into the processor 200 through the ADC; the processor 200 can judge the ambient temperature through the output temperature ADC to perform temperature compensation of smoke detection, thereby enhancing the environmental applicability of the circuit.
It is to be understood that the utility model is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the utility model as defined by the appended claims.
Claims (8)
1. A smoke detection circuit, comprising:
the device comprises a first transmitting tube, a second transmitting tube, a receiving tube and a processor; the first transmitting tube, the second transmitting tube and the receiving tube are respectively in communication connection with the processor;
the first emission tube is used for radiating laser with a first preset wavelength;
the second transmitting tube is used for radiating laser with a second preset wavelength;
the receiving tube is used for receiving the first preset wavelength laser and/or the second preset wavelength laser;
the processor is used for respectively obtaining a first light quantity value and a second light quantity value which characterize the laser received by the receiving tube and determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.
2. The smoke detection circuit of claim 1 further comprising:
and the alarm module is connected with the processor and used for receiving and responding to the alarm signal.
3. The smoke detection circuit of claim 2 wherein said alarm module comprises a buzzer and an LED indicator.
4. The smoke detection circuit of claim 1 further comprising:
the temperature detection module is connected with the processor and used for detecting the ambient temperature;
the processor performs temperature compensation on the smoke detection circuit according to the ambient temperature.
5. The smoke detection circuit of claim 1 further comprising:
and the power supply module is respectively connected with the first transmitting tube, the second transmitting tube, the receiving tube and the processor and is used for providing electric energy.
6. The smoke detection circuit of claim 1 further comprising:
and the key test module is connected with the processor and is used for providing a test function.
7. A smoke detection circuit according to any of claims 1 to 6 in which the first predetermined wavelength laser light and the second predetermined wavelength laser light are the same and are both infra-red light.
8. A smoke alarm comprising a smoke detection circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995623.5U CN216486722U (en) | 2021-11-30 | 2021-11-30 | Smoke detection circuit and smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995623.5U CN216486722U (en) | 2021-11-30 | 2021-11-30 | Smoke detection circuit and smoke alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216486722U true CN216486722U (en) | 2022-05-10 |
Family
ID=81401939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122995623.5U Active CN216486722U (en) | 2021-11-30 | 2021-11-30 | Smoke detection circuit and smoke alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216486722U (en) |
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2021
- 2021-11-30 CN CN202122995623.5U patent/CN216486722U/en active Active
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Address after: 523000, Room 102, Building 10, No. 4 Xinzhu Road, Songshanhu Park, Dongguan City, Guangdong Province Patentee after: Anship Electronic Technology (Dongguan) Co.,Ltd. Address before: 523000 Room 401, building 10, XinZhuYuan, No.4, Xinzhu Road, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: Anship Electronic Technology (Dongguan) Co.,Ltd. |