CN201549047U - Smoke-sensing alarm circuit - Google Patents
Smoke-sensing alarm circuit Download PDFInfo
- Publication number
- CN201549047U CN201549047U CN2009202136405U CN200920213640U CN201549047U CN 201549047 U CN201549047 U CN 201549047U CN 2009202136405 U CN2009202136405 U CN 2009202136405U CN 200920213640 U CN200920213640 U CN 200920213640U CN 201549047 U CN201549047 U CN 201549047U
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- Prior art keywords
- smoke
- module
- alarm circuit
- switch
- sensitive alarm
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Abstract
The utility model relates to a smoke-sensing alarm circuit which comprises a signal judging module, a logic control module, a trumpet driving module and a boost circuit module, wherein the signal judging module obtains an external signal and compares the external signal with a threshold signal, the logic control module controls the working state of the trumpet driving module according to the comparison result, and the boost circuit module increases the external voltage VDD and then provides for the trumpet driving module. The smoke-sensing alarm circuit increases the external voltage and then provides for the trumpet driving module by increasing the boost circuit module, thereby driving a trumpet to work. Therefore, the smoke-sensing alarm circuit can use a low-voltage power supply (1.5V-4.5V) for power supply and has the advantages of low power consumption and low cost; simultaneously, the alarm circuit is conductive to replacing batteries in daily use.
Description
Technical field
The utility model belongs to the fire detection technology field, relates to a kind of smoke-sensitive alarm circuit.
Background technology
At present, in fire detection technology, the smoke-sensitive alarm device has been widely used in public place and the family, for the protection personal safety as well as the property safety plays an important role.The Core Feature of smoke-sensitive alarm device is to utilize smoke detector to detect the concentration of airborne smog, starts loudspeaker when reaching certain smokescope and reports to the police, and is divided into ionic formula smoke-sensitive alarm device and smoke-sensitive alarm device according to the difference of sense cigarette mode
Traditional smoke-sensitive alarm circuit (as shown in Figure 1) comprises the threshold signal module, input signal processing module, signal comparison module, Logic control module, loudspeaker driver module, oscillator module, other functional modules etc.After the smoke detection signal that is obtained by outer locator is handled through the input signal processing module, in the signal comparison module, compare with the preset threshold value signal, if surpass threshold value then think " smog is arranged " state, start the loudspeaker driver module by Logic control module and drive peripheral loudspeaker and report to the police.
According to the safety standard requirement, the chimes of doom of smoke-sensitive alarm device should will reach more than the 85dB in the intensity of sound at 10 inches places of distance alarm device, this is a very high sound requirement, in order to reach such requirement, loudspeaker driver module in the circuit needs higher output power, general smoke-sensitive alarm circuit all uses trifocal piezoelectric loudspeaker sounding, and the dry cell power supply of use 9V is to improve output power.
Use the battery powered power supply mode of 9V not only to increase the power consumption of circuit, and increase the complete machine cost of smoke-sensitive alarm device.Simultaneously because the 9V battery is very uncommon in market, so when the battery electric quantity of smoke-sensitive alarm device exhausted, battery was replaced also inconvenient.
The utility model content
The utility model technical issues that need to address provide a kind of smoke-sensitive alarm circuit, can power with low-tension supply, low-power consumption, low cost, compatible good smoke-sensitive alarm circuit.
In order to solve the problems of the technologies described above, the utility model provides a kind of smoke-sensitive alarm circuit, comprises signal judge module, Logic control module, loudspeaker driver module, booster circuit module; Described signal judge module obtains external signal and compares with threshold signal, described Logic control module is controlled the duty of described loudspeaker driver module according to the result of described comparison, and described booster circuit module offers described loudspeaker driver module after external voltage VDD is raise.
Optionally, when the result of described comparison be described external signal greater than described threshold signal, circuit enters alarm condition.
Optionally, described Logic control module is controlled described booster circuit module according to the result of described comparison, makes the duty of described booster circuit module and described loudspeaker driver module synchronous.
Optionally, described signal judge module comprises signal processing module, threshold signal module, signal comparison module, after external signal is handled through the input signal processing module, compares at the threshold signal of signal comparison module with the generation of threshold signal module.Wherein, described signal processing module amplifies and analog to digital conversion can external signal gaining.State Logic control module and can adopt digital signal processing module.
Optionally, described booster circuit module comprises N electric capacity (C
1-C
N) and capacitor C, N is the natural number greater than 1; Described N electric capacity (C
1-C
N) charged by external voltage VDD when in parallel and disconnect with capacitor C, charge with described external voltage VDD disconnection and to capacitor C during series connection.
Optionally, described N electric capacity (C
1-C
N) all have first end and second end; A described N capacitance series, first end of adjacent capacitor are connected by switch with second end and produce each one at the first vacant end and second end; The described second vacant end ground connection, the described first vacant end links to each other with described capacitor C by switch; Described first end connects external voltage VDD by switch, and other described second ends except that described ground connection second end are by switch ground connection.Wherein, the switch of described connection external voltage VDD can have the on-off circuit of N stand-alone interface at least for an end, and the stand-alone interface of N wherein connects first end of described electric capacity.The switch of described connection external voltage VDD can also be the individual independently switch of N.
Optionally, the individual independently PMOS pipe of the N of described connection external voltage VDD, and the switch of described ground connection is a N-1 independently NMOS pipe.
Optionally, the switch of described ground connection is that an end has the on-off circuit of N-1 stand-alone interface at least, and the stand-alone interface of N-1 wherein connects second end of described electric capacity.
Optionally, the switch of described ground connection is a N-1 independently switch.
Optionally, N electric capacity (C of described serial connection
1-C
N) switch and the described switch that is connected capacitor C be the PMOS pipe.
Optionally, described capacitor C both end voltage is the output voltage V PP of described boost module, VPP=VDD*N.
Optionally, described N electric capacity (C
1-C
N) big or small identical, span is 10pF to 20pF.
Optionally, described capacitor C size is 10nF to 10uF.
Optionally, described external voltage VDD is 1.5V to 4.5V.
Optionally, described booster circuit module is increased to 6V to 12V with external voltage VDD.
Compare with the smoke-sensitive alarm circuit that traditional high-voltage power supply (9V) is powered, the smoke-sensitive alarm circuit that the utility model provides by increasing the booster circuit module, will offer the loudspeaker driver module after the external voltage rising, to drive loudspeaker work.Therefore the utility model can use low-tension supply (1.5V-4.5V) power supply, and low-power consumption and advantage are cheaply arranged, and the warning circuit that while the utility model provides also is beneficial to the replacing of battery in daily use.
Description of drawings
Fig. 1 is the structured flowchart of traditional smoke-sensitive alarm circuit;
Fig. 2 is the structured flowchart of smoke-sensitive alarm embodiment of circuit one of the present utility model;
Fig. 3 is the structured flowchart of smoke-sensitive alarm embodiment of circuit two of the present utility model;
Fig. 4 is the structured flowchart of the embodiment of signal judge module of the present utility model;
Fig. 5 is the structural representation of the embodiment of booster circuit module of the present utility model;
Fig. 6 is the circuit diagram of a kind of preference of booster circuit module of the present invention.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 2 is a kind of embodiment of the utility model (embodiment one's) a structured flowchart.As can be seen from Figure 2, the warning circuit of present embodiment comprises signal judge module, Logic control module, loudspeaker driver module.
Smoke signal in the sensor acquisition environment of panalarm also converts electric signal to, this external signal is obtained by the signal judge module and is compared with threshold signal, Logic control module is controlled the duty of loudspeaker driver module according to the result of described comparison, when external signal during greater than threshold signal, circuit judges is for " having smog " and enter alarm condition, and the loudspeaker driver module starts and drives loudspeaker reports to the police.The loudspeaker driver module drives loudspeaker needs relative higher voltage, and normal voltage is 9V, in order to reduce the supply voltage of circuit, reduces loss, offers described loudspeaker driver module with a booster circuit module after with external voltage VDD rising in the present embodiment.Generally can power to circuit with the voltage of 1.5V-4.5V (preferred 3V), the booster circuit module is increased to 6V-12V (preferred 9V) with this voltage, in order to the loudspeaker driver module is powered.So not only the power consumption of entire circuit has reduced, and the voltage of 1.5V-4.5V also is general in the market cell voltage simultaneously, helps the replacing of battery.
Fig. 3 is the structured flowchart of the another kind of embodiment of the utility model (embodiment two).As can be seen from Figure 3, embodiment two is on the basis of embodiment 3, has increased Logic control module according to the work of signal judge module to the comparative result control booster circuit module of external signal and threshold signal.When comparative result is " smog is arranged ", Logic control module makes the work of booster circuit module so, and to the power supply of loudspeaker driver module, Logic control module makes the work of loudspeaker driver module simultaneously, drives loudspeaker and reports to the police; When comparative result is " non smoke ", Logic control module is not worked booster circuit module and loudspeaker driver module so, and externally power supply has not reduced energy consumption.
The structured flowchart of a kind of signal judge module that can adopt among embodiment one and the embodiment two as shown in Figure 4.The signal judge module comprises: input signal processing module, threshold signal module and signal comparison module.
The input signal processing module gains to the smoke signal of importing (external signal) and amplifies and analog to digital conversion, sends converted digital signal to signal comparator circuit; The threshold signal module produces threshold signal, and signal comparator circuit compares this digital signal and threshold signal, and circuit enters alarm condition when the comparative result of digital signal and threshold signal is " smog is arranged ".Logic control module startup this moment booster circuit module will be to the power supply of loudspeaker driver module, and the loudspeaker driver module drives peripheral loudspeaker and reports to the police.As an optimal way, Logic control module is a digital signal processing module.
The structural representation of a kind of booster circuit module that can adopt among embodiment one and the embodiment two as shown in Figure 5.As can be seen from Figure 5, the booster circuit module comprises N capacitor C
1, C
2..., C
NWith another capacitor C, N is the natural number greater than 1.C
1, C
2..., C
NCharged by external voltage VDD simultaneously when in parallel and disconnect C with capacitor C
1, C
2..., C
NDuring series connection and external voltage VDD disconnects and capacitor C is charged.The both end voltage of capacitor C is output voltage V PP.
Elaborate how to realize C below in conjunction with Fig. 5
1, C
2..., C
NCharged by external voltage VDD simultaneously when in parallel and disconnect C with capacitor C
1, C
2..., C
NDuring series connection and external voltage VDD disconnects and capacitor C is charged.Specifically, capacitor C
1, C
2..., C
NAn end E
P1, E
P2..., E
PNRespectively by on-off circuit K
pVDD links to each other with external voltage.Capacitor C
1Other end E
N1Ground connection, capacitor C
2..., C
NOther end E
N2..., E
NNBy on-off circuit K
nGround connection.Capacitor C
iAn end E
PiWith capacitor C
I+1Other end E
Ni+1Pass through K switch
iLink to each other, 1≤i＜N, i are natural number.That is to say C
1E
P1End and C
2E
N2End passes through K switch
1Link to each other C
2E
P2End and C
3E
N3End passes through K switch
2Link to each other, by that analogy.C
NE
PNEnd passes through K switch
NLink to each other capacitor C other end ground connection with capacitor C one end;
Adopt the switch in the clock signal control circuit, clock signal is produced by an oscillator module.Clock signal gauge tap K
pAnd K switch
nConducting simultaneously or shutoff.Work as K switch
pAnd K switch
nDuring conducting simultaneously, the sequential control K switch all disconnects, at this moment C
1, C
2..., C
NBe in state in parallel, external voltage VDD is to C
1, C
2..., C
NCharging.C
1, C
2..., C
NE
pEnd (comprises E
P1, E
P2..., E
PN) be high level, C
1, C
2..., C
NE
nEnd (comprises E
N1, E
N2..., E
NN) ground connection, the voltage at two ends is VDD.Work as K switch
pAnd K switch
nWhen turn-offing simultaneously, all conductings of sequential control K switch, C at this moment
1, C
2..., C
NBe in series connection.Because the characteristic of electric capacity is worked as K switch
pAnd K switch
nWhen turn-offing simultaneously, C
1, C
2..., C
NThe electric charge at two ends remains unchanged, so voltage is VDD also, when being series connected, and C
1E
N1End ground connection, C
1E
P1End (high level end) and C
2E
N2End (low level) links to each other, C
2E
P2End (high level end) and C
3E
N3End (low level) links to each other, by that analogy.Therefore back C connects
1-C
NTotal voltage be N VDD and.K switch
NConducting make C
1-C
NTo capacitor C charging, the capacitor C both end voltage be N VDD with, i.e. VPP=N*VDD.Here said K switch is a K switch
1, K
2..., K
NGeneral name.
N capacitor C in the present embodiment
1, C
2..., C
NCan be big or small identical, also can be inequality, it is identical to be preferably size.C
1, C
2..., C
NSize be 10pF to 20pF, be preferably 15pF.Capacitor C is much larger than N capacitor C
1, C
2..., C
N, its size is 10nF to 10uF, is preferably 100nF, 200nF, 500nF, 800nF, 1uF, 5uF, 10uF.According to actual needs, can choose suitable N, the low-tension supply on the open market (as dry cell) has and is 1.5V, 3V, 4.5V.The needed driving voltage of loudspeaker driver module is 6V to 12V, and standard compliant is 9V (preferred value).
It is pointed out that above-mentioned K switch
p, K switch
nRefer to module with K switch with switching function.K
pCan be an on-off circuit, an end has N stand-alone interface at least, and the other end is that an interface links to each other with external voltage VDD, and the stand-alone interface of N wherein is respectively at C
1, C
2..., C
NAn end E
P1, E
P2..., E
PNLink to each other.Sequential control K
pOn off state, K switch
pE during disconnection
P1, E
P2..., E
PNDo not link to each other K switch each other
pE during conducting
P1, E
P2..., E
PNLink to each other with external voltage VDD simultaneously.K
pCan also be N independently K switch
P1, K
P2..., K
PN, an end of each switch is also received external voltage VDD, and the other end is respectively at C
1, C
2... C
NAn end E
P1, E
P2..., E
PNLink to each other.
Same, K
nCan be an on-off circuit, an end links to each other with external voltage VDD, and the other end has N-1 stand-alone interface at least, and the stand-alone interface of N-1 wherein is respectively at C
2..., C
NAn end E
N2..., E
NNLink to each other.Sequential control K
nOn off state, K switch
nE during disconnection
N2..., E
NNDo not link to each other K switch each other
nE during conducting
N2..., E
NNLink to each other with external voltage VDD simultaneously.K
nCan also be N-1 independently K switch
N2..., K
NN, an end of each switch also connects ground, and the other end is respectively at C
2..., C
NOther end E
N2..., E
NNLink to each other.
As preferred embodiment a kind of, K switch
pBe the individual independently PMOS pipe of N, K switch
nBe the individual independently NMOS pipe of N-1, K switch is a N independently PMOS pipe.The booster circuit module circuit diagram of N=3 as shown in Figure 6.
Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except as defined by the appended claims, the invention is not restricted at the specific embodiment described in the instructions.
Claims (21)
1. smoke-sensitive alarm circuit, comprise signal judge module, Logic control module, loudspeaker driver module, described signal judge module obtains external signal and compares with threshold signal, described Logic control module is controlled the duty of described loudspeaker driver module according to the result of described comparison, it is characterized in that, described smoke-sensitive alarm circuit also comprises a booster circuit module, offers described loudspeaker driver module after external voltage VDD is raise.
2. smoke-sensitive alarm circuit according to claim 1, it is characterized in that when the result of described comparison for described external signal greater than described threshold signal, circuit enters alarm condition.
3. smoke-sensitive alarm circuit according to claim 1 is characterized in that described Logic control module controls described booster circuit module according to the result of described comparison, makes the duty of described booster circuit module and described loudspeaker driver module synchronous.
4. according to claim 1 or 2 or 3 described smoke-sensitive alarm circuit, it is characterized in that described signal judge module comprises signal processing module, threshold signal module, signal comparison module, after external signal is handled through the input signal processing module, compare at the threshold signal of signal comparison module with the generation of threshold signal module.
5. smoke-sensitive alarm circuit according to claim 4, it is characterized in that described signal processing module gains to external signal amplifies and analog to digital conversion.
6. smoke-sensitive alarm circuit according to claim 4 is characterized in that described Logic control module is a digital signal processing module.
7. smoke-sensitive alarm circuit according to claim 1 is characterized in that described booster circuit module comprises N electric capacity (C
1-C
N) and capacitor C, N is the natural number greater than 1; Described N electric capacity (C
1-C
N) charged by external voltage VDD when in parallel and disconnect with capacitor C, charge with described external voltage VDD disconnection and to capacitor C during series connection.
8. smoke-sensitive alarm circuit according to claim 7 is characterized in that described N electric capacity (C
1-C
N) all have first end and second end; A described N capacitance series, first end of adjacent capacitor are connected by switch with second end and produce each one at the first vacant end and second end; The described second vacant end ground connection, the described first vacant end links to each other with described capacitor C by switch; Described first end connects external voltage VDD by switch, and other described second ends except that described ground connection second end are by switch ground connection.
9. smoke-sensitive alarm circuit according to claim 8, the switch that it is characterized in that described connection external voltage VDD are that an end has the on-off circuit of N stand-alone interface at least, and the stand-alone interface of N wherein connects first end of described electric capacity.
10. smoke-sensitive alarm circuit according to claim 8, the switch that it is characterized in that described connection external voltage VDD are N independently switch.
11. smoke-sensitive alarm circuit according to claim 10 is characterized in that the individual independently PMOS of N of described connection external voltage VDD manages, and the switch of described ground connection is a N-1 independently NMOS pipe.
12. according to Claim 8 or 9 or 10 described smoke-sensitive alarm circuit, the switch that it is characterized in that described ground connection is that an end has the on-off circuit of N-1 stand-alone interface at least, and the stand-alone interface of N-1 wherein connects second end of described electric capacity.
13. according to Claim 8 or 9 or 10 described smoke-sensitive alarm circuit, the switch that it is characterized in that described ground connection is a N-1 independently switch.
14. smoke-sensitive alarm circuit according to claim 8 is characterized in that N electric capacity (C of described serial connection
1-C
N) switch and the described switch that is connected capacitor C be the PMOS pipe.
15. smoke-sensitive alarm circuit according to claim 7 is characterized in that described capacitor C both end voltage is the output voltage V PP of described boost module.
16. smoke-sensitive alarm circuit according to claim 15 is characterized in that VPP=VDD*N.
17. smoke-sensitive alarm circuit according to claim 7 is characterized in that described N electric capacity (C
1-C
N) big or small identical.
18., it is characterized in that described N electric capacity (C according to claim 7 or 17 described smoke-sensitive alarm circuit
1-C
N) size is 10pF to 20pF.
19. smoke-sensitive alarm circuit according to claim 7 is characterized in that described capacitor C size is 10nF to 10uF.
20., it is characterized in that described external voltage VDD is 1.5V to 4.5V according to claim 1 or 7 described smoke-sensitive alarm circuit.
21., it is characterized in that described booster circuit module is increased to 6V to 12V with external voltage VDD according to claim 1 or 7 or 15 or 16 or 20 described smoke-sensitive alarm circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202136405U CN201549047U (en) | 2009-11-17 | 2009-11-17 | Smoke-sensing alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202136405U CN201549047U (en) | 2009-11-17 | 2009-11-17 | Smoke-sensing alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201549047U true CN201549047U (en) | 2010-08-11 |
Family
ID=42604225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202136405U Expired - Lifetime CN201549047U (en) | 2009-11-17 | 2009-11-17 | Smoke-sensing alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201549047U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063774B (en) * | 2009-11-17 | 2013-03-20 | 无锡华润矽科微电子有限公司 | Smoke alarm circuit |
| GB2508033A (en) * | 2012-11-20 | 2014-05-21 | Sprue Safety Products Ltd | Alarm power supply circuit having two modes of operation for providing different levels of current to an alarm circuit |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
-
2009
- 2009-11-17 CN CN2009202136405U patent/CN201549047U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063774B (en) * | 2009-11-17 | 2013-03-20 | 无锡华润矽科微电子有限公司 | Smoke alarm circuit |
| GB2508033A (en) * | 2012-11-20 | 2014-05-21 | Sprue Safety Products Ltd | Alarm power supply circuit having two modes of operation for providing different levels of current to an alarm circuit |
| GB2508033B (en) * | 2012-11-20 | 2016-02-17 | Sprue Safety Products Ltd | Low power detection and alarm |
| US9824561B2 (en) | 2012-11-20 | 2017-11-21 | Sprue Safety Products, Ltd. | Low power detection and alarm |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN109003597B (en) * | 2018-09-25 | 2023-11-03 | 华润微集成电路(无锡)有限公司 | Buzzer driving circuit and corresponding buzzer driving method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100811 |
|
| CX01 | Expiry of patent term |