CN104075823B - Alarm circuit - Google Patents
Alarm circuit Download PDFInfo
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- CN104075823B CN104075823B CN201310099819.3A CN201310099819A CN104075823B CN 104075823 B CN104075823 B CN 104075823B CN 201310099819 A CN201310099819 A CN 201310099819A CN 104075823 B CN104075823 B CN 104075823B
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Abstract
The embodiment of the invention discloses an alarm circuit, which comprises a sensing module, a control module, a switching module, and an alarm module, wherein the sensing module is used for outputting corresponding voltage signals according to temperature in a monitoring region; the control module is used for receiving the voltage signals outputted by the sensing module and outputting corresponding control signals when the temperature in the monitoring region rises to enable the value of the voltage signal to reach the threshold; one end of the switching module is connected with the control module and the other end is grounded, and is used for receiving the control signals outputted by the control module and conducting the circuit; and one end of the alarm module is connected with the switching module and the other end is connected with the positive electrode of the power supply, and is used for giving an alarm to remind a user when conduction of the control signal is received by the switching module. When the alarm circuit of the invention is adopted, the corresponding control signals are formed according to the temperature in the monitoring region, an alarm is automatically given to remind the user when the threshold temperature arrives, the circuit cost is low, and the circuit is simple and easy to use.
Description
Technical field
The present invention relates to electronic applications, more particularly, to a kind of warning circuit.
Background technology
The safety and stability that light fixture uses is extremely important, daily life and work is had very important
Impact.Light fixture prolongation with continuous use time during using, its temperature by more and more higher, when temperature is too high or
In the condition of high temperature, its safety and stability is difficult to be guaranteed light fixture continuous firing, is easily damaged.Adopt in prior art
Special temperature sensor carrys out detection temperature, expensive, relatively costly.
Content of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of warning circuit.Can be according in monitored area
Temperature form corresponding control signal, when reaching threshold temperature, automatic alarm reminds user, and circuit cost is cheap, simply easily
With.
In order to solve above-mentioned technical problem, embodiments provide a kind of warning circuit, including：
Sensing module, for exporting corresponding voltage signal according to the temperature in monitored area, described sensing module includes
First current-limiting resistance, at least two diodes, described at least two diodes are sequentially connected in series, and the positive pole of the first diode passes through institute
State the first current-limiting resistance and connect positive source, the minus earth of the last diode；
Control module, is connected with the common node of described first diode and described first current-limiting resistance, for receiving
State the voltage signal of sensing module output, when the temperature in described monitored area raises so that the value of described voltage signal reaches
During threshold value, described control module exports corresponding control signal；
Switch module, one end is connected with described control module, and the other end is grounded, for receiving described control module output
Control signal, turning circuit；
Alarm module, one end is connected with described switch module, another termination positive source, for connecing when described switch module
When receiving described control signal conducting, alarm user.
Wherein, described sensing module include the first current-limiting resistance, the first diode, the second diode, the 3rd diode,
Four diodes and the 5th diode, a termination positive source of described first current-limiting resistance, described first diode of another termination
Positive pole, the negative pole of described first diode connects the positive pole of described second diode, and the negative pole of described second diode connects described
The positive pole of the 3rd diode, the negative pole of described 3rd diode connects the positive pole of described 4th diode, described 4th diode
Negative pole connects the positive pole of described 5th diode, the minus earth of described 5th diode.
Wherein, described control module includes sampling resistor, controller, the second current-limiting resistance, and described sampling resistor one terminates
The common node of described first current-limiting resistance and described first diode, the analog digital conversion pin of the described controller of another termination,
The voltage input pin of described controller connects positive source, and grounding pin is grounded, and reset pin passes through described second current-limiting resistance
Connect positive source, controlling switch connects described switch module.
Wherein, described switch module includes the 3rd current-limiting resistance and audion, and described 3rd current-limiting resistance one terminates described
The controlling switch of controller, the base stage of the described audion of another termination, the colelctor electrode of described audion connects described alarm module, sends out
Emitter grounding.
Wherein, described switch module also includes filter capacitor, and described filter capacitor one terminates the base stage of described audion, separately
The emitter stage of the one described audion of termination.
Wherein, described alarm module includes buzzer, and described buzzer one terminates positive source, described three poles of another termination
The colelctor electrode of pipe.
Wherein, model IN4007 of described at least two diodes or IN4148.
Wherein, model ATTINY13 of described controller.
Wherein, described audion is NPN type triode.
Wherein, the model 8050 of described audion.
Implement the embodiment of the present invention, have the advantages that：
Because diode is with the rising of temperature, the pressure drop of its PN junction can reduce, and controls two poles by the first current-limiting resistance
Electric current on pipe is less, constantly raises with temperature, and pressure drop is less and less, and the voltage output of change, in control module, works as electricity
It is pressed onto when reaching threshold value, control module output control signal controlling switch module turns on, alarm module warning reminding user.Entirely electricity
The structure on road is simple, using the special temperature sensor of cheap diode in place, easy to use, with low cost.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the connection diagram of the first embodiment of protection circuit of the present invention；
Fig. 2 is the circuit diagram of the second embodiment of protection circuit of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, be the connection diagram of the first embodiment of warning circuit of the present invention, in the present embodiment, described
Circuit includes：Sensing module 1, control module 2, switch module 3 and alarm module 4.
Described sensing module 1 is used for exporting corresponding voltage signal, described sensing module 1 according to the temperature in monitored area
Including the first current-limiting resistance 11, the first diode 12 and the second diode 13, described first diode 12 and the second diode 13
It is sequentially connected in series, that is, the negative pole of described first diode 12 connects the positive pole of described second diode 13, described first diode 12
Positive pole connects positive source, the minus earth of described second diode 13 by described first current-limiting resistance 11；
Specifically, the quantity of diode can need reasonable disposition, when the change to temperature is quicker according to user herein
During sense, 5 even more diodes can be configured.
Described control module 2 is connected with the common node of described first diode 12 and described first current-limiting resistance 11, uses
In the voltage signal receiving the output of described sensing module 1, when the temperature in described monitored area raises so that described voltage signal
Value when reaching threshold value, described control module 2 exports corresponding control signal；
Described switch module 3 one end is connected with described control module 2, and the other end is grounded, for receiving described control module 2
The control signal of output, turning circuit；
Described alarm module 4 one end is connected with described switch module 3, and another termination positive source, for when described switch
When module 3 receives described control signal conducting, alarm user.
Because diode is with the rising of temperature, the pressure drop of its PN junction can reduce, and controls two poles by the first current-limiting resistance
Electric current on pipe is less, constantly raises with temperature, and pressure drop is less and less, and the voltage output of change, in control module, works as electricity
It is pressed onto when reaching threshold value, control module output control signal controlling switch module turns on, alarm module warning reminding user.Entirely electricity
The structure on road is simple, using the special temperature sensor of cheap diode in place, easy to use, with low cost.
Refer to Fig. 2, be the circuit diagram of the second embodiment of protection circuit of the present invention, in the present embodiment, described
Circuit includes：Sensing module, control module, switch module and alarm module.
Preferably, described sensing module include the first current-limiting resistance R1, the first diode D1, the second diode D2, the 3rd
Diode D3, the 4th diode D4 and the 5th diode D5, a termination positive source of described first current-limiting resistance R1, the other end
Connect the positive pole of described first diode D1, the negative pole of described first diode D1 connects the positive pole of described second diode D2, described
The negative pole of the second diode D2 connects the positive pole of described 3rd diode D3, and the negative pole of described 3rd diode D3 connects the described 4th 2
The positive pole of pole pipe D4, the negative pole of described 4th diode D4 meets the positive pole of described 5th diode D5, described 5th diode D5
Minus earth.
Described control module includes sampling resistor R3, controller U, the second current-limiting resistance R2, described sampling resistor R3 one end
Connect the common node of described first current-limiting resistance R1 and described first diode D1, the modulus of the described controller U of another termination turns
Changing pin is second pin, and the voltage input pin of described controller U is that the 8th pin connects positive source, and grounding pin is the 4th
Pin is grounded, and reset pin is that the first pin connects positive source by described second current-limiting resistance R2, and controlling switch is the 3rd to draw
Foot connects described switch module.
Described switch module includes the 3rd current-limiting resistance R4 and audion Q, and described 3rd current-limiting resistance R4 mono- terminates described
The controlling switch of controller U, the base stage of the described audion Q of another termination, the colelctor electrode of described audion Q connects described warning mould
Block, grounded emitter.
It is highly preferred that described switch module also includes filter capacitor C, described filter capacitor C mono- terminates described audion Q's
Base stage, the emitter stage of the described audion Q of another termination.
Described alarm module includes buzzer S, and described buzzer S mono- terminates positive source, the described audion Q of another termination
Colelctor electrode.
Model IN4007 of described at least two diodes or IN4148.Cheap, but steady quality, using degree
Ripe.
Model ATTINY13 of described controller.
Described audion is NPN type triode.
The model 8050 of described audion.
Specifically, raise 1 degree using the every temperature of PN junction of diode, the principle of the pressure drop reduction about 2.0mV of PN junction can be made
Become temperature sensor, in the present embodiment, after 5 diode D1-D5 series connection, form a temperature sensor, the first current limliting
Resistance R1 resistance is larger, and the electric current of diode D1-D5 can be kept as far as possible little, and provides the voltage of 5V to diode D1-D5.Adopting
Add the AD sample circuit of controller U between sample resistance R3 and the first diode D1, to gather the place environment temperature of 5 diodes
The voltage of degree, when reaching voltage threshold, then the controlling switch of controller U is PB4 mouth output high level, audion access switch shape
State, buzzer S alarm sounds point out user.
In the present embodiment, carry out temperature acquisition transfer overvoltage signal by arranging 5 diodes, take full advantage of two
The pressure drop of the pole pipe characteristic related to temperature, whole circuit structure is simple, and stable performance reduces the cost of warning circuit,
When higher to sensitivity requirement, the sensitivity to improve circuit of the quantity of diode can be increased.
It should be noted that each embodiment in this specification is all described by the way of going forward one by one, each embodiment weight
Point explanation is all difference with other embodiments, between each embodiment identical similar partly mutually referring to.
For device embodiment, because it is with embodiment of the method basic simlarity, so description is fairly simple, in place of correlation referring to
The part of embodiment of the method illustrates.
By the description of above-described embodiment, the present invention has advantages below：
Because diode is with the rising of temperature, the pressure drop of its PN junction can reduce, and controls two poles by the first current-limiting resistance
Electric current on pipe is less, constantly raises with temperature, and pressure drop is less and less, and the voltage output of change, in control module, works as electricity
It is pressed onto when reaching threshold value, control module output control signal controlling switch module turns on, alarm module warning reminding user.Entirely electricity
The structure on road is simple, using the special temperature sensor of cheap diode in place, easy to use, with low cost.
One of ordinary skill in the art will appreciate that realizing all or part of flow process in above-described embodiment method, it is permissible
Instruct related hardware to complete by computer program, described program can be stored in a computer read/write memory medium
In, this program is upon execution, it may include as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory（Read-Only Memory, abbreviation ROM）Or random access memory（Random
Access Memory, abbreviation RAM）Deng.
Above disclosed be only present pre-ferred embodiments, certainly the right model of the present invention can not be limited with this
Enclose, the equivalent variations therefore made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (10)
1. a kind of warning circuit is it is characterised in that include：
Sensing module, for exporting corresponding voltage signal according to the temperature in monitored area, described sensing module includes first
Current-limiting resistance, at least two diodes, described at least two diodes are sequentially connected in series, and the positive pole of the first diode passes through described the
One current-limiting resistance connects positive source, the minus earth of the last diode；
Control module, is connected with the common node of described first diode and described first current-limiting resistance, for receiving described biography
The voltage signal of sense module output, when the temperature in described monitored area raises so that the value of described voltage signal reaches threshold value
When, described control module exports corresponding control signal；
Switch module, one end is connected with described control module, and the other end is grounded, for receiving the control of described control module output
Signal, turning circuit；
Alarm module, one end is connected with described switch module, another termination positive source, for receiving institute when described switch module
When stating control signal conducting, alarm user.
2. circuit as claimed in claim 1 is it is characterised in that described sensing module includes the first current-limiting resistance, the one or two pole
Pipe, the second diode, the 3rd diode, the 4th diode and the 5th diode, a termination power of described first current-limiting resistance
Positive pole, the positive pole of described first diode of another termination, the negative pole of described first diode connects the positive pole of described second diode,
The negative pole of described second diode connects the positive pole of described 3rd diode, and the negative pole of described 3rd diode connects described four or two pole
The positive pole of pipe, the negative pole of described 4th diode connects the positive pole of described 5th diode, the minus earth of described 5th diode.
3. circuit as claimed in claim 1 or 2 it is characterised in that described control module include sampling resistor, controller,
Two current-limiting resistances, described sampling resistor one terminates the common node of described first current-limiting resistance and described first diode, another
Terminate the analog digital conversion pin of described controller, the voltage input pin of described controller connects positive source, and grounding pin is grounded,
Reset pin connects positive source by described second current-limiting resistance, and controlling switch connects described switch module.
4. circuit as claimed in claim 3 is it is characterised in that described switch module includes the 3rd current-limiting resistance and audion,
Described 3rd current-limiting resistance one terminates the controlling switch of described controller, the base stage of the described audion of another termination, described three poles
The colelctor electrode of pipe connects described alarm module, grounded emitter.
5. circuit as claimed in claim 4 is it is characterised in that described switch module also includes filter capacitor, described filtered electrical
Hold the base stage of a described audion of termination, the emitter stage of the described audion of another termination.
6. circuit as claimed in claim 5 is it is characterised in that described alarm module includes buzzer, described buzzer one end
Connect positive source, the colelctor electrode of the described audion of another termination.
7. circuit as claimed in claim 6 it is characterised in that model IN4007 of described at least two diodes or
IN4148.
8. circuit as claimed in claim 7 is it is characterised in that model ATTINY13 of described controller.
9. circuit as claimed in claim 8 is it is characterised in that described audion is NPN type triode.
10. circuit as claimed in claim 9 is it is characterised in that the model 8050 of described audion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310099819.3A CN104075823B (en) | 2013-03-26 | 2013-03-26 | Alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310099819.3A CN104075823B (en) | 2013-03-26 | 2013-03-26 | Alarm circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104075823A CN104075823A (en) | 2014-10-01 |
| CN104075823B true CN104075823B (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310099819.3A Active CN104075823B (en) | 2013-03-26 | 2013-03-26 | Alarm circuit |
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| CN (1) | CN104075823B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107479516A (en) * | 2017-08-04 | 2017-12-15 | 安盛信达科技股份公司 | Multistage building managing and control system and method |
| CN109812904B (en) * | 2019-02-19 | 2020-12-04 | 奥克斯空调股份有限公司 | Humidifier |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869342A1 (en) * | 1997-03-31 | 1998-10-07 | Matsushita Electronics Corporation | Electronic device, electronic switching apparatus including the same, and production method thereof |
| CN101762335A (en) * | 2008-12-24 | 2010-06-30 | 精工电子有限公司 | Temperature detection circuit |
| CN201666937U (en) * | 2009-08-25 | 2010-12-08 | 青岛润能软件有限公司 | Safety pre-warning monitoring system |
| CN102610063A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3149857B2 (en) * | 1998-09-04 | 2001-03-26 | 日本電気株式会社 | Output current adjustment circuit with temperature detection mechanism |
-
2013
- 2013-03-26 CN CN201310099819.3A patent/CN104075823B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869342A1 (en) * | 1997-03-31 | 1998-10-07 | Matsushita Electronics Corporation | Electronic device, electronic switching apparatus including the same, and production method thereof |
| CN101762335A (en) * | 2008-12-24 | 2010-06-30 | 精工电子有限公司 | Temperature detection circuit |
| CN201666937U (en) * | 2009-08-25 | 2010-12-08 | 青岛润能软件有限公司 | Safety pre-warning monitoring system |
| CN102610063A (en) * | 2012-04-10 | 2012-07-25 | 苏州苏海亚电气有限公司 | High-temperature alarm |
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| Publication number | Publication date |
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| CN104075823A (en) | 2014-10-01 |
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