CN103446697B - A kind of linkage fault detection device for point type fire detector - Google Patents
A kind of linkage fault detection device for point type fire detector Download PDFInfo
- Publication number
- CN103446697B CN103446697B CN201310311760.XA CN201310311760A CN103446697B CN 103446697 B CN103446697 B CN 103446697B CN 201310311760 A CN201310311760 A CN 201310311760A CN 103446697 B CN103446697 B CN 103446697B
- Authority
- CN
- China
- Prior art keywords
- resistance
- photo
- coupler
- point type
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses a kind of linkage fault detection device for point type fire detector, it connects failure detector circuit and comprises the first switching tube, second switch pipe, voltage-stabiliser tube, the first photo-coupler, the second photo-coupler, the first power supply and the second power supply, base-the emitter-base bandgap grading that is elementary, the first switching tube of point type fire detector, the first photo-coupler is connected in series between the two ends of the first power supply, and the secondary colelctor electrode of the first photo-coupler connects a wherein signal input part of core controller; Second switch pipe penetrate-base stage, voltage-stabiliser tube is connected in series between the positive pole of the first power supply and the colelctor electrode of the first switching tube, the colelctor electrode of second switch pipe connects the elementary positive pole of the second photo-coupler, and the secondary colelctor electrode of the second photo-coupler connects another signal input part of core controller.The short circuit of point type fire detector, open fault information can be exported to core controller by the present invention, make it avoid misoperation occurs.
Description
Technical field
The present invention relates to a kind of failure detector, particularly relate to a kind of linkage fault detection device for point type fire detector.
Background technology
Point type fire detector is widely used in various fire prevention system, and itself and core controller cooperatively interact, in various fire prevention system, play great function.Within 2002, the Ministry of Public Security is proposed GA386-2002 standard, requires that the fire prevention system be made up of point type fire detector and core controller should have the measuring ability of point type fire detector short circuit or open fault, and can send corresponding acousto-optic-electric alarm signal.But, just it seems at present, the fire prevention system that the point type fire detector of prior art and core controller are formed still does not possess this function, and this just causes: when open circuit occurs point type fire detector and fire occurs, core controller is judged as occurring without fire; When point type fire detector be short-circuited and non-breaking out of fire time, core controller is judged as that fire occurs.Obviously, if the fire prevention system that point type fire detector and core controller are formed effectively can not detect the connection fault of point type fire detector, probably when fire occurs, immeasurable loss is caused to the personal safety and safety of property of user.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art, a kind of linkage fault detection device for point type fire detector is provided, point type fire detector can be short-circuited by it, open fault time, the short circuit of point type fire detector, open fault information are sent to core controller in time, make core controller make corresponding response, avoid misoperation occurs.
The technical solution adopted for the present invention to solve the technical problems is: a kind of linkage fault detection device for point type fire detector, comprise point type fire detector and core controller, also comprise connection failure detector circuit, this connection failure detector circuit comprises the first switching tube, second switch pipe, voltage-stabiliser tube, first photo-coupler, second photo-coupler, first power supply and the second power supply, point type fire detector, first photo-coupler elementary, base-the emitter-base bandgap grading of the first switching tube is connected in series between the two ends of the first power supply, the secondary colelctor electrode of first photo-coupler connects a wherein signal input part of core controller, second switch pipe penetrate-base stage, voltage-stabiliser tube is connected in series between the positive pole of the first power supply and the colelctor electrode of the first switching tube, the colelctor electrode of second switch pipe connects the elementary anode of the second photo-coupler, the minus earth that second photo-coupler is elementary, the secondary colelctor electrode of the second photo-coupler connects another signal input part of core controller, first photo-coupler and the elementary of the second photo-coupler are powered by the first power supply, are secondaryly powered by the second power supply.
Described connection failure detector circuit also comprises the 3rd switching tube, the base stage of the 3rd switching tube connect core controller enable/reseting controling end, the colelctor electrode of the 3rd switching tube connects the emitter stage of described first switching tube, and the emitter stage of the 3rd switching tube connects the negative pole of described first power supply.
Described connection failure detector circuit also comprises the first resistance, and this first resistance is connected with elementary being in parallel of described first photo-coupler.
Described connection failure detector circuit also comprises the second resistance and the 3rd resistance, between the base stage that this second resistance is connected to described second switch pipe and the negative electrode of described voltage-stabiliser tube, between the colelctor electrode that the 3rd resistance is connected to described 3rd switching tube and the emitter stage of described first switching tube.
Described connection failure detector circuit also comprises the 4th resistance, the 5th resistance and the 6th resistance, between the colelctor electrode that 4th resistance is connected to described 3rd switching tube and the base stage of described first switching tube, 5th resistance is connected between the base stage of described second switch pipe and the emitter stage of described second switch pipe, and the 6th resistance is connected between the colelctor electrode of described second switch pipe and the elementary anode of described second photo-coupler.
Described connection failure detector circuit also comprises an electric capacity, and this electric capacity is in parallel with described 4th resistance and is connected.
Described connection failure detector circuit also comprises the 7th resistance, the 8th resistance and the 9th resistance, 7th resistance is connected between the secondary colelctor electrode of described first photo-coupler and the positive pole of described second power supply, 8th resistance is connected between the secondary colelctor electrode of described second photo-coupler and the positive pole of described second power supply, the 9th resistance be connected to the base stage of described 3rd switching tube and described core controller enable/reseting controling end between.
The voltage of described first power supply is 24V, and the negative pole of described first power supply and described second power supply altogether.
Described first switching tube and described 3rd switching tube are NPN type, and described second switch pipe is positive-negative-positive.
Described point type fire detector is spot-type smoke detector or point type heat fire detector.
The invention has the beneficial effects as follows:
1, owing to adopting the first switching tube, second switch pipe, voltage-stabiliser tube, first photo-coupler, second photo-coupler, the connection failure detector circuit that first power supply and the second power supply are formed, make the present invention can point type fire detector be short-circuited or open fault time, by the first switching tube, the change of second switch pipe and voltage-stabiliser tube state changes the state that the first photo-coupler is secondary and the second photo-coupler is secondary, thus by the short circuit of point type fire detector, open fault is separately converted to data signal, and export to core controller, core controller is made respectively respond accurately, thus, the present invention can avoid core controller point type fire detector be short-circuited or open fault time occur misoperation,
2, adopt the 3rd switching tube to carry out the on off operating mode of control connection failure detector circuit, also achieve the reset function of point type fire detector;
3, the first resistance increased, the second resistance, the 3rd resistance coordinate the first switching tube, second switch pipe, voltage-stabiliser tube, the first photo-coupler, the second photo-coupler, the first power supply and the second power supply, also the normal operating conditions of point type fire detector be converted into data signal and export to core controller, (prior art is exported with analog signaling by the work state information of point type fire detector compared to existing technology for this, data signal is processed into core controller again) through complicated circuit, its circuit structure is more simple, and cost is lower.
Below in conjunction with drawings and Examples, the present invention is described in further detail; But a kind of linkage fault detection device for point type fire detector of the present invention is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the physical circuit connection diagram of connection failure detector circuit of the present invention.
Detailed description of the invention
Embodiment, refer to Fig. 1, shown in Fig. 2, a kind of linkage fault detection device for point type fire detector of the present invention, comprise point type fire detector 1, core controller 2 be connected failure detector circuit 3, this connection failure detector circuit 3 comprises the first switch transistor T 1, second switch pipe T2, voltage-stabiliser tube DZ1, first photo-coupler U1, second photo-coupler U2, first power supply and the second power supply, point type fire detector 1, first photo-coupler U1's is elementary, base-the emitter-base bandgap grading of the first switch transistor T 1 is connected in series between the two ends of the first power supply, the colelctor electrode of the first photo-coupler U1 level meets a wherein signal input part DB0 of core controller 2, second switch pipe T2 penetrates-base stage, between positive pole that voltage-stabiliser tube DZ1 is connected in series in the first power supply and the colelctor electrode of the first switch transistor T 1, the colelctor electrode of second switch pipe T2 connects the elementary anode of the second photo-coupler U2, the minus earth that second photo-coupler U2 is elementary, the colelctor electrode of the second photo-coupler U2 level meets another signal input part DB1 of core controller 2, first photo-coupler U1 and the elementary of the second photo-coupler U2 are powered by the first power supply, and secondary (i.e. phototriode) is powered by the second power supply.
Preferred as one, above-mentioned connection failure detector circuit 3 also comprises the 3rd switch transistor T 3, the base stage of the 3rd switch transistor T 3 connect core controller 2 enable/reseting controling end EN, the colelctor electrode of the 3rd switch transistor T 3 connects the emitter stage of the first switch transistor T 1, and the emitter stage of the 3rd switch transistor T 3 connects the negative pole of the first power supply.
Preferred as one, above-mentioned connection failure detector circuit 3 also comprises the first resistance R1, the second resistance R2 and the 3rd resistance R3, and this first resistance R1 is connected with elementary being in parallel of the first photo-coupler U1; Between the base stage that second resistance R2 is connected to second switch pipe T2 and the negative electrode of voltage-stabiliser tube DZ1, the 3rd resistance R3 is connected between the colelctor electrode of the 3rd switch transistor T 3 and the emitter stage of the first switch transistor T 1.
Above-mentioned connection failure detector circuit 3 also comprises the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and electric capacity C1,4th resistance R4 is connected between the colelctor electrode of the 3rd switch transistor T 3 and the base stage of the first switch transistor T 1,5th resistance R5 is connected between the base stage of second switch pipe T2 and the emitter stage of second switch pipe T2, and the 6th resistance R6 is connected between the colelctor electrode of second switch pipe T2 and the elementary anode of the second photo-coupler U2; Electric capacity C1 is in parallel with the 4th resistance R4 and is connected.
Above-mentioned connection failure detector circuit 3 also comprises the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9, between the colelctor electrode that 7th resistance R7 is connected to the first photo-coupler U1 level and the positive pole of the second power supply, between the colelctor electrode that 8th resistance R8 is connected to the second photo-coupler U2 level and the positive pole of the second power supply, the 9th resistance R9 be connected to the base stage of the 3rd switch transistor T 3 and core controller 2 enable/reseting controling end EN between.
The voltage of above-mentioned first power supply is 24V, and the voltage of the second power supply is 5V, and the negative pole of this first power supply and the second power supply altogether.
Above-mentioned first switch transistor T 1 and the 3rd switch transistor T 3 are NPN type, and second switch pipe T2 is positive-negative-positive.
Above-mentioned point type fire detector 1 is smoke point detector or point heat detector.
Above-mentioned core controller 2 can be fire resisting shutter core controller, also can be in other system with point type fire detector matching used master controller.Core controller 2 can be all kinds of 8 and above singlechip chip, such as PIC16F877,89S52 etc.The signal input part of core controller 2 is its two I/O pin.
A kind of linkage fault detection device for point type fire detector of the present invention, when core controller 2 enable/the voltage V of reseting controling end EN
eNduring=+ 5V, the 3rd switch transistor T 3 conducting, point type fire detector 1 series connection the 3rd resistance R3 after the base-penetrate two PN junctions of the elementary of the first photo-coupler U1 and the first switch transistor T 1 accesses 24V power supply, and point type fire detector 1 enters duty; When core controller 2 enable/the voltage V of reseting controling end EN
eNduring=0V, the 3rd switch transistor T 3 is ended, point type fire detector 1 power down, now, I/O pin DB0 and the DB1 output logic high level respectively of core controller 2, core controller 2 correspondence makes following response: point type fire detector 1 does not carry out fire condition judgement, is in reset mode.
When core controller 2 enable/the voltage V of reseting controling end EN
eNduring=+ 5V, way circuit enters duty, and now, the contingent four kinds of duties of point type fire detector 1 are as described below:
If 1 point type fire detector 1 occurs opening a way with core controller 2 be connected fault, then flow through the electric current I of point type fire detector 1
1be that the 0, first switch transistor T 1 is ended, make the electric current I flowing through voltage-stabiliser tube DZ1
2also be 0, therefore the electric current of elementary (light emitting diode) of the first photo-coupler U1 and elementary (light emitting diode) of the second photo-coupler U2 is respectively 0, secondary (phototriode) of the first photo-coupler U1 and secondary (phototriode) of the second photo-coupler U2 are ended respectively, then I/O pin DB0 and DB1 of core controller 2 input logic high level respectively, core controller 2 correspondence is made to make following response: to judge that point type fire detector 1 occurs that open circuit connects fault, send open fault alarm signal.
If with core controller 2,2 point type fire detectors 1 occur that short circuit is connected fault, collection-the emitter voltage being about 0.7V, the first switch transistor T 1 and the 3rd switch transistor T 3 due to primary voltage (light-emitting diodes tube voltage) the about 1.1V of the first photo-coupler U1, the base-emitter voltage of the first switch transistor T 1 is about 0.2V, therefore I
1equal the ratio of the voltage (24-1.1-0.7-0.2=22V) of the 3rd resistance R3 and the resistance (3.9K ohm) of the 3rd resistance R3, i.e. I
1≈ 5.6mA, the current potential U of the colelctor electrode position of the first switch transistor T 1
bequal the collection-emitter voltage of the first switch transistor T 1, the voltage of the 3rd resistance R3 and the collection-emitter voltage sum of the 3rd switch transistor T 3, namely equal 22.4V, therefore voltage-stabiliser tube DZ1 can not conducting, I
2=0, make to flow through the secondary cut-off that the elementary electric current of the second photo-coupler U2 is the 0, second photo-coupler U2, the I/O pin DB1 input logic high level of core controller 2; Owing to flowing through the electric current I of the first resistance R1
r1≈ 1.1/2000=0.55mA, i.e. I
1middle about 0.55mA is close to road by the first resistance R1, and about 5.05mA flows through the elementary of the first photo-coupler U1, and thus the first photo-coupler U1's is secondary saturated, the I/O pin DB0 input logic low level of core controller 2.Now, core controller 2 correspondence makes following response: judge that point type fire detector 1 occurs that short circuit connects fault, send short trouble alarm signal.
If 3 point type fire detectors 1 and core controller 2 are without being connected fault and without the condition of a fire, then the electric current flowing through point type fire detector 1 is less than 0.6mA, i.e. I
1≤ 0.6mA, I
1electric current is close to road by the first resistance R1 substantially, does not flow through the elementary of the first photo-coupler U1, thus the secondary cut-off of the first photo-coupler U1, the I/O pin DB0 input logic high level of core controller 2; The current potential U of the colelctor electrode position of the first switch transistor T 1
b≈ 0.2 × 2+I
1× R
3< 2.8V, the second resistance R2 both end voltage U
r2≈ (24-U
b-0.7-3.3) V > 17V, I
2=U
r2/ R
2> 1.7mA, I
2amplify through second switch pipe T2, drive that the second photo-coupler U2's is elementary, make it saturation conduction, then the secondary saturation conduction of the second photo-coupler U2, the I/O pin DB1 input logic low level of core controller 2.Now, core controller 2 correspondence makes following response: judge that point type fire detector 1 does not have short circuit or open circuit to connect fault, detected position does not have fire to occur.
If 4 point type fire detectors 1 and core controller 2 are without being connected fault but having the condition of a fire, then point type fire detector 1 both end voltage U
detector=4.0 ~ 6.6V, the 3rd resistance R3 both end voltage is that 24V deducts point type fire detector 1 voltage 4.0 ~ 6.6V, the first photo-coupler U1 primary voltage 1.1V, the first switch transistor T 1 base-emitter voltage 0.7V, the 3rd switch transistor T 3 collect-emitter voltage 0.2V, i.e. U
r3≈ (24-U
detector-1.1-0.7-0.2)=15.4 ~ 18V, I
1≈ U
r3/ R
3=3.95 ~ 4.62mA, I
1middle about 0.55mA is close to road by the first resistance R1, and separately about 3.40 ~ 4.07mA flows through the elementary of the first photo-coupler U1, makes the secondary saturation conduction of the first photo-coupler U1, the I/O pin DB0 input logic low level of core controller 2.Because second switch pipe T2 penetrates-base voltage 0.7V, the second resistance R2 both end voltage U
r2, voltage-stabiliser tube DZ1 both end voltage 3.3V and the first switch transistor T 1 collect-emitter voltage 0.2V sum equals primary terminal voltage 1.1V and the first switch transistor T 1 base-emitter voltage 0.7V sum of fire detector both end voltage (4.0 ~ 6.6V) and the first photo-coupler U1, therefore the second resistance R2 both end voltage U
r2≈ (point type fire detector 1 both end voltage+1.1+0.7-0.7-0.2-3.3) V=1.6 ~ 4.2V, I
2=U
r2/ R
2=0.16 ~ 0.42mA; I
2amplify through second switch pipe T2, drive that the second photo-coupler U2's is elementary, make the secondary saturation conduction of the second photo-coupler U2, thus make the I/O pin DB1 input logic low level of core controller 2.Now, core controller 2 correspondence makes following response: judge that point type fire detector 1 does not have short circuit or open circuit to connect fault, detected position has fire to occur, and sends fire alarm signal.
Four kinds of duties that above point type fire detector 1 occurs, and the response that core controller 2 correspondence is made (the various responses that here, core controller correspondence is made adopt prior art to realize) is as shown in the table:
A kind of linkage fault detection device for point type fire detector of the present invention, adopt foregoing circuit structure, not only meet the GA386-2002 core controller professional standard that the Ministry of Public Security promulgates, namely the short circuit of point type fire detector and open circuit can be connected fault message and export to core controller, avoid core controller generation misoperation, the current signal of point type fire detector can also be converted to core controller can the logic level signal of direct-detection, make whole circuit structure compared with prior art, more simple, cost is lower.In addition, the present invention also can reset to the alarm condition of point type fire detector.
Above-described embodiment is only used for further illustrating a kind of linkage fault detection device for point type fire detector of the present invention; but the present invention is not limited to embodiment; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all fall in the protection domain of technical solution of the present invention.
Claims (7)
1. a linkage fault detection device for point type fire detector, comprise point type fire detector and core controller, it is characterized in that: also comprise connection failure detector circuit, this connection failure detector circuit comprises the first switching tube, second switch pipe, voltage-stabiliser tube, first photo-coupler, second photo-coupler, first power supply and the second power supply, point type fire detector, first photo-coupler elementary, base-the emitter-base bandgap grading of the first switching tube is connected in series between the two ends of the first power supply, the secondary colelctor electrode of first photo-coupler connects a wherein signal input part of core controller, second switch pipe penetrate-base stage, voltage-stabiliser tube is connected in series between the positive pole of the first power supply and the colelctor electrode of the first switching tube, the colelctor electrode of second switch pipe connects the elementary anode of the second photo-coupler, the minus earth that second photo-coupler is elementary, the secondary colelctor electrode of the second photo-coupler connects another signal input part of core controller, first photo-coupler and the elementary of the second photo-coupler are powered by the first power supply, are secondaryly powered by the second power supply,
Described connection failure detector circuit also comprises the 3rd switching tube, the base stage of the 3rd switching tube connect core controller enable/reseting controling end, the colelctor electrode of the 3rd switching tube connects the emitter stage of described first switching tube, and the emitter stage of the 3rd switching tube connects the negative pole of described first power supply;
Described connection failure detector circuit also comprises the first resistance, and this first resistance is connected with elementary being in parallel of described first photo-coupler;
Described connection failure detector circuit also comprises the second resistance and the 3rd resistance, between the base stage that this second resistance is connected to described second switch pipe and the negative electrode of described voltage-stabiliser tube, between the colelctor electrode that the 3rd resistance is connected to described 3rd switching tube and the emitter stage of described first switching tube.
2. linkage fault detection device for point type fire detector according to claim 1, it is characterized in that: described connection failure detector circuit also comprises the 4th resistance, the 5th resistance and the 6th resistance, between the colelctor electrode that 4th resistance is connected to described 3rd switching tube and the base stage of described first switching tube, 5th resistance is connected between the base stage of described second switch pipe and the emitter stage of described second switch pipe, and the 6th resistance is connected between the colelctor electrode of described second switch pipe and the elementary anode of described second photo-coupler.
3. linkage fault detection device for point type fire detector according to claim 2, is characterized in that: described connection failure detector circuit also comprises an electric capacity, and this electric capacity is in parallel with described 4th resistance and is connected.
4. linkage fault detection device for point type fire detector according to claim 1, it is characterized in that: described connection failure detector circuit also comprises the 7th resistance, the 8th resistance and the 9th resistance, 7th resistance is connected between the secondary colelctor electrode of described first photo-coupler and the positive pole of described second power supply, 8th resistance is connected between the secondary colelctor electrode of described second photo-coupler and the positive pole of described second power supply, the 9th resistance be connected to the base stage of described 3rd switching tube and described core controller enable/reseting controling end between.
5. linkage fault detection device for point type fire detector according to claim 1, is characterized in that: the voltage of described first power supply is 24V, and the negative pole of described first power supply and described second power supply altogether.
6. linkage fault detection device for point type fire detector according to claim 1, is characterized in that: described first switching tube and described 3rd switching tube are NPN type, and described second switch pipe is positive-negative-positive.
7. linkage fault detection device for point type fire detector according to claim 1, is characterized in that: described point type fire detector is spot-type smoke detector or point type heat fire detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310311760.XA CN103446697B (en) | 2013-07-23 | 2013-07-23 | A kind of linkage fault detection device for point type fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310311760.XA CN103446697B (en) | 2013-07-23 | 2013-07-23 | A kind of linkage fault detection device for point type fire detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103446697A CN103446697A (en) | 2013-12-18 |
| CN103446697B true CN103446697B (en) | 2015-09-30 |
Family
ID=49729798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310311760.XA Expired - Fee Related CN103446697B (en) | 2013-07-23 | 2013-07-23 | A kind of linkage fault detection device for point type fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103446697B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022108594A1 (en) * | 2020-11-20 | 2022-05-27 | Grid20/20, Inc | Wildfire and public safety event detection systems and methods |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954905B (en) * | 2014-05-16 | 2016-07-06 | 哈尔滨工业大学 | Digital circuit failure testing circuit and the method utilizing this circuit test fault |
| CN106983970B (en) * | 2017-02-16 | 2019-11-26 | 中汽客汽车零部件（厦门）有限公司 | A kind of fire early warning and fire control unit and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2419919A1 (en) * | 1974-04-25 | 1975-11-13 | Grescha Ges Grefe & Scharf | Fire alarm system with smoke detectors - has parallel contacts in closed loop and series failure contacts operating when alarm fails |
| CN101411929A (en) * | 2008-11-20 | 2009-04-22 | 江苏银佳企业集团有限公司 | Double-wire system special module |
| CN201749167U (en) * | 2010-07-20 | 2011-02-16 | 广东易事特电源股份有限公司 | Connecting terminal off-line detection circuit |
| CN202443552U (en) * | 2012-01-11 | 2012-09-19 | 泉州雷航电子有限公司 | Fire hazard flame detector |
| CN202651746U (en) * | 2012-05-22 | 2013-01-02 | 奇瑞汽车股份有限公司 | Power supply over-voltage protection circuit |
| CN103191539A (en) * | 2013-03-07 | 2013-07-10 | 上海松江飞繁电子有限公司 | Multi-line control device and method related to fire-fighting interlocking equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01302180A (en) * | 1988-05-31 | 1989-12-06 | Hitachi Seiko Ltd | Disconnection detecting system |
| JPH02206769A (en) * | 1989-02-07 | 1990-08-16 | Hitachi Seiko Ltd | Disconnection detecting circuit |
| JPH0795356B2 (en) * | 1989-12-06 | 1995-10-11 | 忠夫 大畑 | Circuit abnormality automatic detection circuit |
| KR100439522B1 (en) * | 2002-04-22 | 2004-07-12 | 삼우산기 주식회사 | An automation fire extinguisher having a safty circuit |
-
2013
- 2013-07-23 CN CN201310311760.XA patent/CN103446697B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2419919A1 (en) * | 1974-04-25 | 1975-11-13 | Grescha Ges Grefe & Scharf | Fire alarm system with smoke detectors - has parallel contacts in closed loop and series failure contacts operating when alarm fails |
| CN101411929A (en) * | 2008-11-20 | 2009-04-22 | 江苏银佳企业集团有限公司 | Double-wire system special module |
| CN201749167U (en) * | 2010-07-20 | 2011-02-16 | 广东易事特电源股份有限公司 | Connecting terminal off-line detection circuit |
| CN202443552U (en) * | 2012-01-11 | 2012-09-19 | 泉州雷航电子有限公司 | Fire hazard flame detector |
| CN202651746U (en) * | 2012-05-22 | 2013-01-02 | 奇瑞汽车股份有限公司 | Power supply over-voltage protection circuit |
| CN103191539A (en) * | 2013-03-07 | 2013-07-10 | 上海松江飞繁电子有限公司 | Multi-line control device and method related to fire-fighting interlocking equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022108594A1 (en) * | 2020-11-20 | 2022-05-27 | Grid20/20, Inc | Wildfire and public safety event detection systems and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103446697A (en) | 2013-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206321756U (en) | A kind of power-fail detection circuit and switching power circuit | |
| CN202217019U (en) | Three-phase supply input open phase detection circuit | |
| CN103446697B (en) | A kind of linkage fault detection device for point type fire detector | |
| CN103784099B (en) | Zero cross detection circuit and dish-washing machine | |
| CN103336235A (en) | IGBT condition detection circuit | |
| CN201084002Y (en) | PLC digital quantity input interface circuit | |
| CN106788381A (en) | A kind of switching value input circuit for relay-protection tester | |
| CN104425998A (en) | Power socket and electric shock prevention circuit thereof | |
| CN104422839A (en) | Ethernet power supply function test circuit and tool | |
| CN106246586B (en) | A kind of DC fan failure detector circuit | |
| CN209842877U (en) | Signal lamp fault detection circuit combining signal lamp and signal controller | |
| CN114501733B (en) | LED constant current drive circuit with open circuit detection function | |
| CN206114824U (en) | Low -cost fuse supervisory circuits | |
| CN203398784U (en) | Reversal connection protection circuit of battery charging circuit | |
| CN204719122U (en) | A kind of voltage detecting warning circuit | |
| CN202586752U (en) | Low-voltage protection linear power supply circuit and television set | |
| CN206180574U (en) | Electronic equipment's protection circuit and electronic equipment | |
| CN205539169U (en) | From master control temperature floor zero cross detection circuit | |
| CN219322622U (en) | Intelligent classroom eye-protection lamp | |
| CN209982060U (en) | Reverse connection prevention protection circuit for direct-current power supply | |
| CN216598956U (en) | Short-circuit protection circuit and alternating-current charging pile | |
| CN207851030U (en) | One gas detecting instrument of the six directions | |
| CN207732757U (en) | A kind of inexpensive telecommunication circuit with isolation features | |
| CN204649926U (en) | A kind of single-phase electric energy meter on-load switch break-make identification circuit | |
| CN212646821U (en) | Universal detection circuit for PNP and NPN signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20210723 |