CN201917546U - Humidity protection alarm - Google Patents
Humidity protection alarm Download PDFInfo
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- CN201917546U CN201917546U CN2010206924212U CN201020692421U CN201917546U CN 201917546 U CN201917546 U CN 201917546U CN 2010206924212 U CN2010206924212 U CN 2010206924212U CN 201020692421 U CN201020692421 U CN 201020692421U CN 201917546 U CN201917546 U CN 201917546U
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Abstract
The utility model discloses a humidity protection alarm, which comprises a power supply, a relay, a protection mechanism, a first probe, a first switching tube, a second switching tube, a current-limiting element and a first resistance, wherein one end of a coil of the relay is connected with the power supply, the other end of the coil of the relay is connected with an emitting electrode of the first switching tube, and a switch of the relay is connected with the protection mechanism; a collector electrode of the first switching tube is connected with the current-limiting element, and a base electrode of the first switching tube is connected with a collector electrode of the second switching tube; the other end of the current-limiting element is connected with the first probe; a base electrode of the second switching tube is connected with a connecting point of the first probe and the current-limiting element, and an emitting electrode of the second switching tube is grounded; and one end of the first resistance is connected with a connecting point of the base electrode of the second switching tube and the current-limiting element, and the other end of the first resistance is grounded. Since the technical scheme is applied, a current driving method is adopted, threshold voltage Uref can be set without regulating a divider resistance, the generality of the humidity protection alarm is then strong, and the problem that the alarm is difficult to regulate is further solved.
Description
Technical field
The utility model relates to the circuit protection technical field, more particularly, relates to a kind of humidity protection alarm.
Background technology
In harmful gas detects, corrode for preventing that harmful acidic liquid from flowing in the cabinet with gas circuit, be provided with humidity protection alarm in the gas circuit, prevent that acidic liquid from damaging internal circuit element.Present humidity protection alarm is the input voltage U that carries in the input voltage signal that will be converted to through sensor
InWith the threshold voltage U that sets in advance in the alarm
RefCompare, as input voltage U
InGreater than threshold voltage U
RefThe time, output high level voltage drives relay work, alarm equipment alarm.
The circuit diagram of existing humidity protection alarm comprises: power Vcc 1, comparer 2, divider resistance R1 and R2, sensor 3, relay 4 and protection mechanism 5 as shown in Figure 1; Wherein: divider resistance R1 and R2 are connected in series between power Vcc 1 and the ground.The reverse input end of comparer 2 connects the tie point of divider resistance R1 and R2, and positive input connects sensor 3, and the output terminal of comparer 2 connects the input end of relay 4, and the output terminal of relay 4 connects protection mechanism 5.
According to the electric resistance partial pressure principle, the magnitude of voltage of comparer 2 reverse input ends is U=R2*Vcc/ (R1+R2), that is to say, the threshold voltage U of humidity protection alarm shown in Figure 1
RefBe the magnitude of voltage on the divider resistance R2.Therefore, the input voltage that carries in the input voltage signal that is converted to through sensor 3 is greater than threshold voltage U
RefThe time, comparer 2 output high level voltages drive relay 4 work, and then relay 4 drives protection mechanism 5 work.Otherwise, comparer 2 output low levels, relay 4 is not worked.
Can know by inference based on foregoing description: different threshold voltage U
RefNeed coupling different divider resistance R1 and R2.Therefore, must choose suitable divider resistance, thereby cause the versatility of alarm poor for different threshold voltages.Further, after divider resistance was provided, the later stage of circuit was adjusted inconvenient, promptly causes threshold voltage U
RefRegulate difficulty.
The utility model content
For solving the problems of the technologies described above, the utility model provides a kind of humidity protection alarm, and is poor with the versatility that solves existing alarm, adjusts the problem of difficulty.Technical scheme is as follows:
The utility model provides a kind of humidity protection alarm, power supply, relay, protection mechanism, first probe, first switching tube, second switch pipe, current limiting element and first resistance; Wherein:
Coil one end of described relay connects described power supply, and the other end connects the emitter of first switching tube, and the switch of described relay connects described protection mechanism;
The collector of described first switching tube connects described current limiting element, and base stage connects the collector of second switch pipe;
The other end of described current limiting element connects described first probe;
The base stage of described second switch pipe connects the tie point of described first probe and described current limiting element, grounded emitter;
One end of described first resistance connects the base stage of described second switch pipe and the tie point of current limiting element, other end ground connection.
Use technique scheme, when the first probe place has flow of conductive liquid out-of-date, first probe with current delivery to the second switch pipe.The eb of second switch pipe (emitter-base, emitter-base stage) knot produces electric current I eb, and simultaneously, the electric current that the collector of second switch pipe flows out flows into the eb knot of first switching tube again.The electric current I c that the collector of first switching tube flows out flows into the second switch pipe again through current limiting element; promptly produce positive feedback current; the electric current of second switch pipe eb knot is Ieb and Ic sum; second switch is guaranteed adequate food and conducting; thereby the collector current of second switch pipe is increased; and then increase the electric current that flows into relay, and drive relay and drive protection mechanism work, damage internal circuit element to prevent acidic liquid.And do not have flow of conductive liquid out-of-date when the first probe place, because the shunting of first resistance, the electric current that flows through the second switch pipe is partial current poor of the electric current I c and first resistance, therefore, the electric current I eb decline of second switch pipe breaks away from saturated, and second switch pipe eb knot ends, and then the collector output current of second switch pipe is zero, thereby the electric current that causes flowing into relay is zero, the relay end-of-job.
Based on above statement as can be known; what the humidity protection alarm that the utility model embodiment provides adopted is the current drives mode; when the first probe place has flow of conductive liquid out-of-date; the positive feedback current that the first switching tube collector flows out makes second switch guarantee adequate food and conducting, and the electric current of relay increases, and then relay drives protection mechanism work; not have flow of conductive liquid out-of-date when the first probe place; the second switch pipe ends, and the electric current of relay is zero, and then does not work.Different with existing threshold voltage driving, need not to adjust divider resistance set threshold voltage U
Ref, and then make humidity protect the highly versatile of alarm, further solve existing alarm and adjust difficult problem.
Description of drawings
Fig. 1 is the circuit diagram of humidity protection alarm in the prior art;
The humidity that Fig. 2 provides for the utility model embodiment is protected a kind of circuit diagram of alarm;
The humidity that Fig. 3 provides for the utility model embodiment is protected the another kind of circuit diagram of alarm;
The humidity that Fig. 4 provides for the utility model embodiment is protected another circuit diagram of alarm;
The humidity that Fig. 5 provides for the utility model embodiment is protected another circuit diagram of alarm.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills belong to protection domain of the present utility model not making the every other embodiment that is obtained under the creative work prerequisite.
An embodiment
The applicant finds that after deliberation present humidity protection alarm adopts threshold voltage U
RefTrigger relay work, and then different threshold voltage U
RefNeed the different divider resistance of coupling.Therefore, for different threshold voltages U
RefMust choose suitable divider resistance, thereby cause the versatility of alarm poor.Further, after divider resistance was provided, the later stage of circuit was adjusted inconvenient, promptly causes threshold voltage U
RefRegulate difficulty.
In order to address the above problem, the utility model embodiment provides a kind of humidity protection alarm based on current drives, its circuit diagram comprises as shown in Figure 2: power supply, relay K, protection mechanism (not drawing among the figure), first probe, the first switching tube Q1, second switch pipe Q2, current limiting element P and first resistance R 1; Wherein: power supply is positive supply Vcc, and the first switching tube Q1 is the PNP Darlington transistor, and second switch pipe Q2 is the NPN Darlington transistor.
Coil one end of relay K connects positive supply Vcc, and the other end connects the emitter of the first switching tube Q1, and the switch of relay K connects protection mechanism; The collector of the first switching tube Q1 connects current limiting element P, and base stage connects the collector of second switch pipe Q2.The other end of current limiting element P connects first probe.The grounded emitter of second switch pipe Q2, base stage connects the tie point of the current limiting element P and first probe.One end of first resistance R 1 connects the base stage of second switch pipe Q2 and the tie point of current limiting element P, other end ground connection.
In order to protect the first switching tube Q1, prevent that it is breakdown, humidity protection alarm shown in Figure 2 also comprises: the first diode D1 and the second diode D2; Wherein: the anode of the first diode D1 connects the emitter of the first switching tube Q1 and the tie point of relay K, and negative electrode connects the anode of the second diode D2; The negative electrode of the second diode D2 connects the base stage of the first switching tube Q1.
The course of work of humidity shown in Figure 2 protection alarm is: when the first probe place has flow of conductive liquid out-of-date, first probe with current delivery to second switch pipe Q2.The eb knot of second switch pipe Q2 produces electric current I eb, and simultaneously, the electric current that the collector of second switch pipe Q2 flows out flows into the eb knot of the first switching tube Q1 again.The electric current I c that the collector of first switching tube flows out flows into second switch pipe Q2 again through current limiting element P; promptly produce positive feedback current; the eb junction current of second switch pipe Q2 is Ieb and Ic sum; make second switch pipe Q2 saturation conduction; thereby the collector current of second switch pipe Q2 is increased; and then increase the electric current that flows into relay K, and drive relay K and drive protection mechanism work, damage internal circuit element to prevent acidic liquid.And do not have flow of conductive liquid out-of-date when the first probe place, because the shunting of first resistance R 1, the electric current that flows through second switch pipe Q2 is partial current poor of the electric current I c and first resistance R 1, therefore, the eb junction current Ieb decline of second switch pipe Q2 breaks away from saturated, and the eb knot of second switch pipe Q2 ends, and then the collector output current of second switch pipe Q2 is zero, thereby the electric current that causes flowing into relay K is zero, the relay K end-of-job.
Among the utility model embodiment, current limiting element P controls the first switching tube Q1 and flows to the interior electric current of second switch pipe Q2.This current limiting element P can be a resistance, also can be constant current source.In the humidity protection alarm shown in Figure 2; the first switching tube Q1 and second switch pipe Q2 are respectively PNP Darlington transistor and NPN Darlington transistor; because the saturation voltage drop of Darlington transistor is big; therefore in order to reduce saturation voltage drop; the first switching tube Q1 can be the PNP triode, and second switch pipe Q2 can be the NPN triode.That is to say that the first switching tube Q1 is that PNP triode and/or second switch pipe Q2 are the NPN triode, can solve the big problem of saturation voltage drop.
Based on above statement as can be known; what the humidity protection alarm that the utility model embodiment provides adopted is the current drives mode; when the first probe place has flow of conductive liquid out-of-date; positive feedback current makes second switch pipe Q2 saturation conduction, and the electric current of relay K increases, and then relay K drives protection mechanism work; not have flow of conductive liquid out-of-date when the first probe place; second switch pipe Q2 ends, and the electric current of relay K is zero, and then does not work.Different with existing threshold voltage driving, need not to adjust divider resistance set threshold voltage U
Ref, and then make humidity protect the highly versatile of alarm, further solve existing alarm and adjust difficult problem.
Another embodiment
See also Fig. 3, Fig. 3 is the another kind of circuit diagram of the humidity protection alarm that provides of the utility model embodiment.Comprise: power supply, relay K, protection mechanism (not drawing among the figure), first probe, the first switching tube Q1, second switch pipe Q2, current limiting element P and first resistance R 1.The annexation of each components and parts protects the annexation of the components and parts that have same numeral in the alarm identical with humidity shown in Figure 2 in the humidity protection alarm shown in Figure 3, and embodiment is no longer set forth to this utility model.Its difference is: power supply is negative supply-Vcc in the humidity protection alarm shown in Figure 3, and the first switching tube Q1 is the NPN Darlington transistor, and second switch pipe Q2 is the PNP Darlington transistor.
In order to protect the first switching tube Q1, prevent that it is breakdown, humidity protection alarm shown in Figure 3 also comprises: the 3rd diode D3 and the 4th diode D4; Wherein: the negative electrode of the 3rd diode D3 connects the emitter of the first switching tube Q1 and the tie point of relay K, and anode connects the negative electrode of the 4th diode D4; The anode of the 4th diode D4 connects the base stage of the first switching tube Q1.
In addition, for second switch pipe Q2 is realized current-limiting protection, humidity protection alarm shown in Figure 2 also comprises: the 5th diode D5 and the 6th diode D6; Wherein: the negative electrode of the 5th diode D5 connects the tie point of the current limiting element P and first probe, and anode connects the negative electrode of the 6th diode D6, the plus earth of the 6th diode D6.
Among the utility model embodiment, current limiting element P controls the first switching tube Q1 and flows to the interior electric current of second switch pipe Q2.This current limiting element P can be a resistance, also can be constant current source.In the humidity protection alarm shown in Figure 3; the first switching tube Q1 and second switch pipe Q2 are respectively NPN Darlington transistor and PNP Darlington transistor; because the saturation voltage drop of Darlington transistor is big; therefore in order to reduce saturation voltage drop; the first switching tube Q1 can be the NPN triode; second switch pipe Q2 can be the PNP triode, and promptly the first switching tube Q1 is that PNP triode and/or second switch pipe Q2 are the NPN triode, can solve the big problem of saturation voltage drop.
The course of work of humidity protection alarm shown in Figure 3 is identical with the course of work of humidity protection alarm shown in Figure 2, and this is no longer set forth.
Use technique scheme, different with existing threshold voltage driving, need not to adjust divider resistance set threshold voltage U
Ref, and then make humidity protect the highly versatile of alarm, further solve existing alarm and adjust difficult problem.
Need to prove: Fig. 2 and circuit diagram shown in Figure 3 can be used as a kind of novel thyristor element and use.Simultaneously, existing thyristor is not owing to connect current limiting element P between two Darlington transistors, and therefore the Darlington transistor that causes linking to each other with first probe is in conducting state all the time, can't realize the turn-offed control to relay K.And the utility model uses the mode of current feedback and 1 shunting of first resistance R, control flows into the electric current of the second switch pipe Q2 that links to each other with first probe, thereby not have flow of conductive liquid out-of-date when the first probe place, the second switch pipe Q2 that assurance links to each other with first probe ends, and realizes the turn-offed control to relay K.Certainly, Fig. 2 and novel thyristor element shown in Figure 3 be except using in humidity protection alarm, can also use in temperature protection alarm, air quality protection alarm or the like.
Another embodiment
Fig. 2 and humidity protection alarm shown in Figure 3; the electric current at the first probe place must guarantee its eb knot by second switch pipe Q2; when by electric current during greater than the conducting electric current, humidity protection alarm detects sour gas or the fashionable warning of flow of liquid, the protection cabinet inside.Amplify owing to lacked the one-level electric current, therefore, Fig. 2 and humidity shown in Figure 3 protect the sensitivity of alarm to be lower than Fig. 4 and Fig. 5.
For poor in the existing alarm versatility of solution, when adjusting difficulty, improve sensitivity, the utility model embodiment: a kind of circuit diagram that the practicality of a kind of humidity protection alarm is provided comprises: power supply, relay K, protection mechanism (not drawing among the figure), first probe, the first switching tube Q1, second switch pipe Q2, current limiting element P, first resistance R 1, second resistance R 2, the 3rd switching tube Q3, second probe, the 3rd resistance R 3 as shown in Figure 4; Wherein: power supply is positive supply Vcc, and the first switching tube Q1 is the PNP triode, and second switch pipe Q2 is the NPN triode, and the 3rd switching tube Q3 is the NPN Darlington transistor.
Coil one end of relay K connects positive supply Vcc, and the other end connects the emitter of the first switching tube Q1, and the switch of relay K connects protection mechanism; The collector of the first switching tube Q1 connects current limiting element P, and base stage connects the collector of second switch pipe Q2.The grounded emitter of second switch pipe Q2, base stage connects the other end of current limiting element P.One end of first resistance R 1 connects the tie point of the base stage of current limiting element P and second switch pipe Q2, other end ground connection.The emitter of the 3rd switching tube Q3 connects the tie point of the base stage of current limiting element P and second switch pipe Q2, and base stage connects first probe, and collector connects the other end connection positive supply Vcc of second resistance R, 2, the second resistance R 2 and the tie point of relay K.Second probe connects the tie point of second resistance R 2 and the 3rd switching tube Q3 collector.The 3rd resistance R 3 connects between the tie point and ground of first probe and the 3rd switching tube Q3 base stage.
In order to prevent positive supply Vcc reversal connection, add one the 7th diode D7 in the junction of positive supply Vcc and relay K.The anode of the 7th diode D7 connects positive supply Vcc, and negative electrode connects the tie point of the relay K and second resistance R 2.In addition, for to second switch pipe Q2 current-limiting protection, humidity protection alarm shown in Figure 4 also comprises: the 8th diode D8 and the 9th diode D9.Wherein: the anode of the 8th diode D8 connects the tie point of current limiting element P and second switch pipe Q2 base stage, and negative electrode connects the anode of the 9th diode D9, the plus earth of the 9th diode D9.
The humidity protection alarm that the utility model embodiment provides also comprises: first capacitor C 1 and second capacitor C 2, as shown in Figure 4.First capacitor C 1 is connected between second switch pipe Q2 base stage and the ground, and second capacitor C 2 is connected between the tie point and ground of the base stage of the 3rd switching tube Q3 and first probe, to prevent the relay K shake.Simultaneously, puncture, between the base stage of the first switching tube Q1 and emitter, connect shunt resistance R4 in order to prevent the first switching tube Q1.Certainly, can also between the base stage of the first switching tube Q1 and emitter, connect catching diode and replace shunt resistance R4.At this moment, the anode of catching diode connects the emitter of the first switching tube Q1, and negative electrode connects the base stage of the first switching tube Q1.
The course of work of humidity protection alarm shown in Figure 4 is: have flow of conductive liquid out-of-date between first probe and second probe, the emitter output current of the 3rd switching tube Q3.This electric current flows through first resistance R 1 and produces Vr1 voltage, when Vr1 voltage is 0.7V, a part of output current makes second switch pipe Q2 conducting by the eb knot generation Ieb electric current of second switch pipe Q2, flow through the again eb knot of the first switching tube Q1 of the Ic electric current of second switch pipe Q2, produce positive feedback current Ir1 through current limiting element P, this moment, the electric current sum of Ieb and Ir1 made the rapid saturation conduction of second switch pipe Q2, thereby obtained big current drives relay K; After flow of liquid is crossed first probe and second probe, the output current of the 3rd switching tube Q3 disappears, the positive feedback current Ir1 of the first switching tube Q1 flows into first resistance R 1 and second switch pipe Q2, therefore, the electric current that flows into the eb knot of second switch pipe Q2 this moment is partial current poor of the positive feedback current Ir1 and first resistance R 1, second switch pipe Q2 is ended, and then relay K quit work.
Need to prove: among the utility model embodiment, current limiting element P controls the first switching tube Q1 and flows to the interior electric current of second switch pipe Q2.This current limiting element P can be a resistance, also can be constant current source.In the humidity protection alarm shown in Figure 4, the 3rd switching tube Q3 can be the NPN triode, can improve the sensitivity of humidity protection alarm equally.And the first switching tube Q1 can also be the PNP Darlington transistor, and second switch pipe Q2 can also be the NPN Darlington transistor.It is poor that the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3 can adopt the combination in any of the switching tube described in the utility model embodiment to have the alarm versatility now in solution, when adjusting difficulty, improves sensitivity.
Use technique scheme, it is poor to adopt the current drives mode to solve existing humidity protection alarm versatility, adjusts the problem of difficulty.Simultaneously, owing to increased by the 3rd switching tube Q3,, improve sensitivity because the amplification of the 3rd switching tube Q3 is reduced to below 1 microampere the output current at the probe place that wins at the first probe place.
Another embodiment
See also Fig. 5, Fig. 5 is the another kind of circuit diagram of the humidity protection alarm that provides of the utility model embodiment.Comprise: power supply, relay K, protection mechanism (not drawing among the figure), first probe, the first switching tube Q1, second switch pipe Q2, current limiting element P, first resistance R 1, second resistance R 2, the 3rd switching tube Q3, second probe, the 3rd resistance R 3.The annexation of each components and parts protects the annexation of the element device that has same numeral in the alarm identical with humidity shown in Figure 4 in the humidity protection alarm shown in Figure 5, and embodiment is no longer set forth to this utility model.Its difference is: power supply is negative supply-Vcc in the humidity protection alarm shown in Figure 5, and the first switching tube Q1 is the NPN triode, and second switch pipe Q2 is the PNP triode, and the 3rd switching tube Q3 is the PNP Darlington transistor.
In order to prevent negative supply-Vcc reversal connection, add one the tenth diode D10 in the junction of negative supply-Vcc and relay K.The negative electrode of the tenth diode D10 connects negative supply-Vcc, and anode connects the tie point of the relay K and second resistance R 2.In addition, for to second switch pipe Q2 current-limiting protection, humidity protection alarm shown in Figure 5 also comprises: the 11 diode D11 and the 12 diode D12.Wherein: the negative electrode of the 11 diode D11 connects the tie point of current limiting element P and second switch pipe Q2 base stage, and anode connects the negative electrode of the 9th diode D9, the plus earth of the 9th diode D9.
The humidity protection alarm that the utility model embodiment provides also comprises: the 3rd capacitor C 3 and the 4th capacitor C 4, as shown in Figure 5.The 3rd capacitor C 3 is connected between second switch pipe Q2 base stage and the ground, and the 4th capacitor C 4 is connected between the tie point and ground of the base stage of the 3rd switching tube Q3 and first probe, to prevent the relay K shake.Simultaneously, puncture, between the base stage of the first switching tube Q1 and emitter, connect shunt resistance R4 in order to prevent the first switching tube Q1.Certainly, can also between the base stage of the first switching tube Q1 and emitter, connect catching diode and replace shunt resistance R4.At this moment, the negative electrode of catching diode connects the emitter of the first switching tube Q1, and anode connects the base stage of the first switching tube Q1.
The principle of work of humidity protection alarm shown in Figure 5 is identical with the principle of work of humidity protection alarm shown in Figure 4, and this is no longer set forth.
Need to prove: the first switching tube Q1 can also be the NPN Darlington transistor among the utility model embodiment, and second switch pipe Q2 can also be the PNP Darlington transistor, and the 3rd switching tube Q3 can also be the PNP triode.It is poor that the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3 can adopt the combination in any of the switching tube described in the utility model embodiment to have the alarm versatility now in solution, when adjusting difficulty, improves sensitivity.
Use technique scheme, existing humidity protection alarm versatility is poor having solved, and adjusts the problem of difficulty.Simultaneously, improved sensitivity.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment is conspicuous to those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and the corresponding to wide region of features of novelty.
Claims (11)
1. a humidity protection alarm is characterized in that, comprising: power supply, relay (K), protection mechanism, first probe, first switching tube (Q1), second switch pipe (Q2), current limiting element (P) and first resistance (R1); Wherein:
Coil one end of described relay (K) connects described power supply, and the other end connects the emitter of first switching tube (Q1), and the switch of described relay (K) connects described protection mechanism;
The emitter of described first switching tube (Q1) connects the end that described relay (K) does not connect described power supply, and collector connects described current limiting element (P), and base stage connects the collector of second switch pipe (Q2);
The other end of described current limiting element (P) connects described first probe;
The base stage of described second switch pipe (Q2) connects the tie point of described first probe and described current limiting element (P), grounded emitter;
One end of described first resistance (R1) connects the base stage of described second switch pipe (Q2) and the tie point of current limiting element (P), other end ground connection.
2. humidity protection alarm according to claim 1 is characterized in that described power supply is positive supply (Vcc), and described first switching tube (Q1) is PNP Darlington transistor or PNP triode, and described second switch pipe (Q2) is NPN Darlington transistor or NPN triode.
3. humidity protection alarm according to claim 2 is characterized in that, also comprises: first diode (D1) and second diode (D2); Wherein:
The anode of described first diode (D1) connects the emitter of described first switching tube (Q1) and the tie point of described relay (K), and negative electrode connects the anode of described second diode (D2); The negative electrode of described second diode (D2) connects the base stage of described first switching tube (Q1).
4. humidity protection alarm according to claim 1; it is characterized in that; described power supply is that (Vcc), described first switching tube (Q1) is NPN Darlington transistor or NPN triode to negative supply, and described second switch pipe (Q2) is PNP Darlington transistor or PNP triode.
5. humidity protection alarm according to claim 4 is characterized in that, also comprises: the 3rd diode (D3) and the 4th diode (D4); Wherein:
The negative electrode of described the 3rd diode (D3) connects the emitter of described first switching tube (Q1) and the tie point of described relay (K), and anode connects the negative electrode of described the 4th diode (D4); The anode of described the 4th diode (D4) connects the base stage of described first switching tube (Q1).
6. humidity protection alarm according to claim 5 is characterized in that, also comprises: the 5th diode (D5) and the 6th diode (D6); Wherein:
The negative electrode of described the 5th diode (D5) connects the tie point of the described current limiting element (P) and first probe, and anode connects the negative electrode of described the 6th diode (D6), the plus earth of described the 6th diode (D6).
7. humidity protection alarm according to claim 1 is characterized in that described power supply is positive supply (Vcc), and described first switching tube (Q1) is PNP triode or PNP Darlington transistor, and described second switch pipe (Q2) is NPN triode or NPN Darlington transistor;
Described first probe is connected by the 3rd switching tube (Q3) with described current limiting element (P); The base stage of described the 3rd switching tube (Q3) connects described first probe, emitter connects the tie point of described current limiting element (P) and second switch pipe (Q2) base stage, collector links to each other with described positive supply (Vcc) by second resistance (R2), and described the 3rd switching tube (Q3) is NPN Darlington transistor or NPN triode;
Described humidity protection alarm also comprises: second probe that is connected described second resistance (R2) and described the 3rd switching tube (Q3) collector tie point;
Be connected the tie point of described first probe and described the 3rd switching tube (Q3) base stage and the 3rd resistance (R3) between the ground.
8. humidity protection alarm according to claim 7 is characterized in that, also comprises: the 7th diode (D7), the 8th diode (D8), the 9th diode (D9), first electric capacity (C1) and second electric capacity (C2); Wherein:
The anode of described the 7th diode (D7) connects described positive supply (Vcc), and negative electrode connects the tie point of described relay (K) and described second resistance (R2);
The anode of described the 8th diode (D8) connects the tie point of described current limiting element (P) and second switch pipe (Q2) base stage, and negative electrode connects the anode of described the 9th diode (D9), the plus earth of described the 9th diode (D9);
Described first electric capacity (C1) is connected between the base stage and ground of described second switch pipe (Q2);
Described second electric capacity (C2) is connected between the tie point and ground of described the 3rd switching tube (Q3) base stage and described first probe.
9. humidity protection alarm according to claim 1, it is characterized in that, described power supply is that (Vcc), described first switching tube (Q1) is NPN triode or NPN Darlington transistor to negative supply, and described second switch pipe (Q2) is PNP triode or PNP Darlington transistor;
Described first probe is connected by the 3rd switching tube (Q3) with described current limiting element (P); The base stage of described the 3rd switching tube (Q3) connects described first probe, emitter connects the tie point of described current limiting element (P) and second switch pipe (Q2) base stage, (Vcc) link to each other, described the 3rd switching tube (Q3) is PNP Darlington transistor or PNP triode to collector with described negative supply by second resistance (R2);
Described humidity protection alarm also comprises: second probe that is connected described second resistance (R2) and described the 3rd switching tube (Q3) collector tie point;
Be connected the tie point of described first probe and described the 3rd switching tube (Q3) base stage and the 3rd resistance (R3) between the ground.
10. humidity protection alarm according to claim 9 is characterized in that, also comprises: the tenth diode (D10), the 11 diode (D11), the 12 diode (D12), the 3rd electric capacity (C3) and the 4th electric capacity (C4); Wherein:
The negative electrode of described the tenth diode (D10) connects described negative supply, and (Vcc), anode connects the tie point of described relay (K) and described second resistance (R2);
The negative electrode of described the 11 utmost point (D11) pipe connects the tie point of described current limiting element (P) and described second switch pipe (Q2) base stage, and anode connects the negative electrode of described the 12 diode (D12), the plus earth of described the 12 diode (D12);
Described the 3rd electric capacity (C3) is connected between described second switch pipe (Q2) base stage and the ground;
Described the 4th electric capacity (C4) is connected between the tie point and ground of described the 3rd switching tube (Q3) base stage and described first probe.
11., it is characterized in that described current limiting element (P) is current-limiting resistance or constant current source according to any described humidity protection alarm of claim 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206924212U CN201917546U (en) | 2010-12-30 | 2010-12-30 | Humidity protection alarm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206924212U CN201917546U (en) | 2010-12-30 | 2010-12-30 | Humidity protection alarm |
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| CN201917546U true CN201917546U (en) | 2011-08-03 |
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| CN (1) | CN201917546U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522972A (en) * | 2011-12-31 | 2012-06-27 | 北京雪迪龙科技股份有限公司 | Automatic cut-off silicon-controlled equivalent circuit |
| CN102564986A (en) * | 2011-12-30 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Smoke mercury emission monitoring system and method |
| CN108896613A (en) * | 2018-04-16 | 2018-11-27 | 华为技术有限公司 | Water logging detection device and method |
-
2010
- 2010-12-30 CN CN2010206924212U patent/CN201917546U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564986A (en) * | 2011-12-30 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Smoke mercury emission monitoring system and method |
| CN102522972A (en) * | 2011-12-31 | 2012-06-27 | 北京雪迪龙科技股份有限公司 | Automatic cut-off silicon-controlled equivalent circuit |
| CN108896613A (en) * | 2018-04-16 | 2018-11-27 | 华为技术有限公司 | Water logging detection device and method |
| CN108896613B (en) * | 2018-04-16 | 2021-06-15 | 华为技术有限公司 | Water immersion detection device and method |
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Granted publication date: 20110803 |