CN2674561Y - Dual-purpose alarm for electricity and door lock - Google Patents
Dual-purpose alarm for electricity and door lock Download PDFInfo
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- CN2674561Y CN2674561Y CN 03222241 CN03222241U CN2674561Y CN 2674561 Y CN2674561 Y CN 2674561Y CN 03222241 CN03222241 CN 03222241 CN 03222241 U CN03222241 U CN 03222241U CN 2674561 Y CN2674561 Y CN 2674561Y
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Abstract
The utility model relates to a dual-purpose alarm for electricity and a door lock. A time base oscillating circuit composed of a JL-20 integrated circuit and elements on the periphery, a pitch converting circuit, a sound generating circuit, a housing, the back cover of sphere face with variable radian measure compose an induced circuit of voltage division type which has lower input impedance; resistors R1 and R2, a capacitor C1, an inductor A1, resistors R3 and R4, a capacitor C2, and an inductor A2 connected among the middle pin 1, the pin 2, and the pin 17 of the JL-20 integrated circuit compose a processing circuit of signal detection of voltage division type which has lower input impedance. Resistors R5, R6, and R7, capacitors C3 and C4, and a triode T1 connected among the pin 3, the pin 4, and the pin 8 composed a voltage stabilizing circuit of switching type; resistors R11 and R12, capacitors C7, C8, and C9, diodes D3 and D4 and a converting switch SW2 connected with the pin 6 and the pin 15 compose a converting circuit of self test, approaching electricity alarm, door lock alarm. The utility model has the advantages of better stability, more reliable performance, more convenient use, and lower cost.
Description
Technical field
The utility model relates to a kind of can the warning during near hi-line and when receiving the dual-purpose alarm of nearly electricity, door lock that the picking lock signal can be reported to the police.
Background technology
Owing to produced very strong electromagnetic field around the high-voltage charged body, when human body near the time life security of human body constituted threat, so the staff of power department enters the high pressure field requirement and has the alarming in short range of electric power device with oneself.The alarming in short range of electric power device be the electromagnetic field signal around the high-voltage charged bodies such as hi-line as received signal, again it is converted to electric signal, according to the judgement to the signal power, whether decision reports to the police.This signal that receives only has induction electromotive force usually, and electric current is very little.If will improve receiving ability to this signal, known way is: the impedance that increases inducing receiver or use field effect transistor to improve signal input part, but such way, can bring some shortcomings: the volume of alarm increases, and carries inconvenience, input impedance higher signal treatment circuit job insecurity, be subject to the influence of environment such as temperature, humidity, make that the output signal of subsequent process circuit is also unstable, thereby false alarm might take place, have certain accident potential.Simultaneously, also different for its alarm distance of different high-voltage charged bodies, for making alarm be suitable for multiple different occasions, also there is at present the part alarm to be provided with the driving switch that is fit to various electric pressures, and employing manual shift, but operating personnel have carelessness slightly, and whether or not during this gear shift can produce the error of reporting to the police again.
Office buildings in the life, home security are that people worry the thing of caring for always, yet, be difficult on the market find practicality is arranged, than the burglar alarm product of high performance-price ratio.Even Shang Shi anti-theft product once is because of they all are to report to the police by the supervision to people's physical location, so can't be suitable for huge numbers of families.
About the installation of alarm and wear, if need be installed on the safety helmet,, and bored the safety helmet in hole as the alarming in short range of electric power device normally with the fixing way of boring, physical strength reduces naturally.Same in addition product is installed or carries difficult just more unpredictable under multiple occasion because the inalterability of profile wants to expand more function again.
Summary of the invention
The utility model purpose is to overcome the deficiency that prior art exists, and provides not only that a kind of stability is better, more reliable performance, use is more convenient and cost is lower alarming in short range of electric power device, and it is again a door lock alarm that practicality is very strong.
The technical scheme of the utility model purpose is: a kind of nearly electricity, the dual-purpose alarm of door lock comprise the plastic casing and the bonnet of sensor circuit, time-base oscillation circuit, tone changing circuit, sound generating circuit and the injection molded be made up of JL-20 integrated circuit and peripheral cell.The time-base oscillation circuit is by the capacitor C that is connected on JL-20 integrated circuit pin 11, the pin 10
6, resistance R
10And connect to form with pin 12; The tone changing circuit is by the switch SW that is connected between JL-20 integrated circuit pin 13 and the pin 14
1Form; Sound generating circuit is by the resistance R that is connected on the JL-20 integrated circuit pin 9
8, R
9, triode T
2, inductance L and light emitting diode D
1, D
2Form with piezo SP and external socket J, wherein triode T
2Base stage connecting resistance R
8, collector also is connected with resistance R
9With inductance L polyphone branch road, piezo SP, light emitting diode D
1, D
2Link to each other with external socket J and with the negative pole of battery, emitter connects anode; It is characterized in that: also have the resistance R that is connected between pin 1 in the JL-20 integrated circuit, pin 2 and the pin 17
1, R
2, capacitor C
1, inductor A
1And resistance R
3, R
4, capacitor C
2, inductor A
2Sensor circuit and input treatment circuit, the wherein resistance R of the relatively low input impedance of forming of two-way partial pressure type
1And R
2And resistance R
3And R
4Deliver to pin 1 and pin 2 respectively from the partial pressure value that the pin 17 of JL-20 integrated circuit is obtained, the size of partial pressure value has determined the size of induction sensitivity within the specific limits; By the resistance R that is connected pin 3 in the JL-20 integrated circuit, pin 4, pin 8
5, R
6, R
7, capacitor C
3, C
4And triode T
1The switching regulator mu balanced circuit of forming, wherein pin 5 meets V
SS, be connected with resistance R between pin 3 and the pin 4
5, R
6And capacitor C
3, be connected on the resistance R on the pin 8
7With triode T
1Base stage connect triode T
1Collector and anode between the cross-over connection capacitor C
4, triode T
1Emitter connect battery cathode, resistance R
5And R
6Partial pressure value deliver to the pin 4 of JL-20 integrated circuit, after treatment, by pin 8 output signals; By the resistance R that is connected on the JL-20 integrated circuit pin 6,15
11, R
12, capacitor C
7, C
8, C
9, diode D
3, D
4And switch SW
2Three working positions self check, alarming in short range of electric power, door lock warning change-over circuit, wherein the diode D that form
3Negative pole be connected the other end and resistance R with pin 6
12, capacitor C
7Connect resistance R
12The other end and pin 18V
DDConnect capacitor C
7Positive pole and capacitor C
8Connect capacitor C
8The other end, diode D
4Positive pole and pin 7V
SSConnect, the other end of diode D4 is connected resistance R with pin 15
11Be connected between pin 15 and the pin 18, with inductor A
1The capacitor C that connects
9By shielding line PB and switch SW
2Connect, when pin 6 and pin 15 are connected for differentiating circuit, resistance R
11Be pull-up resistor, R
11With C
7Long-pending each duration of decision door lock alarm sound; Described bonnet is the bonnet of variable radian sphere, and bonnet is pasted other attachment by double sticky tape.
The utility model passes through the electromagnetic field around the hi-line by JL-20 integrated circuit and peripheral cell resistance R thereof
1, R
2, capacitor C
1, inductor A1 and resistance R
3, R
4, capacitor C
2, inductor A
2The sensor circuit of the relatively low input impedance of forming of two-way partial pressure type is sent to the input processing circuit processes, thereby the analog signal conversion that receives is become the pulse digital signal of certain frequency, send subsequent conditioning circuit to handle again, finally send sound generating circuit, and send chimes of doom, and by the JL-20 integrated circuit analog quantity is converted into digital quantity, then digital quantity is handled, because the reliable and stable and good anti-interference of digital signal has so just been optimized the complete machine performance.Simultaneously, sensor circuit uses single field effect transistor to improve input impedance no longer as known, because the high resistant of grid is unsettled, uncontrollable, can change with temperature, humidity, and signal magnitude is fluctuateed.And induced signal of the present utility model becomes the dividing potential drop branch road by being connected JL-20 integrated circuit pin 1 with two resistor group on the pin 17, constitute relatively low impedance, utilize threshold voltage fixing on the JL-20 integrated circuit pin 1, when the induced signal on being superimposed upon divider resistance surpasses this threshold value, with regard to startup work.Such sensor circuit is subjected to such environmental effects just less, the signal stabilization that obtains, thus the reliability of complete machine is improved.The inside of JL-20 integrated circuit is carried out frequency and is differentiated the above-mentioned signal that has been converted into digital quantity, thereby can determine the true and false and the size of signal.By determining the true and false of signal, this has just improved the antijamming capability of alarm.JL-20 has two road feel induction signal receiving ports, so just can handle several high pressure level signal inequality, distinguish human body different high-pressure area of living in, also just reach the purpose of automatic switchover gear by sending different chimes of dooms, thereby use more conveniently, eliminated accident potential.The alarm distance of each electric pressure is: 10KV-0.7 rice, 35KV-1 rice, 110KV-1.5 rice, 220KV-3 rice, 500KV-7 rice.
Because alarm of the present utility model is to work in the category of small-signal, this just requires circuit that advantages of higher stability is arranged, i.e. the necessary voltage stabilizing of operating voltage, and be not subjected to Temperature Influence.The mu balanced circuit of the switching regulator that JL-20 integrated circuit and peripheral cell thereof are formed just can satisfy this requirement, compares with traditional voltage stabilizing, and not only temperature is floated for a short time, and almost not power consumption again makes that Overall Power Consumption is very little.Because the existence of voltage stabilizing, when using powered battery, though cell voltage constantly descends in time, the voltage in the circuit is stable.When cell voltage drops to certain ultimate value when following, the JL-20 integrated circuit will send battery failure warning sound, the prompting changing battery.
When the JL-20 integrated circuit by when self check terminal supportor 15 is connected with the form of logic terminal supportor 6 usefulness differentiating circuit, the alarming in short range of electric power device has just converted antitheft door lock alarm at this moment.This burglar alarm is to exercise supervision by the concrete behavior to the people, promptly whether has the action behavior of picking lock, after sensor circuit receives the picking lock signal, can send chimes of doom, and can delay time a period of time at once.The purpose of this anti-theft device is that the robber is blocked outdoors, rather than the sort ofly differentiates by the physical location to the people, even just begins the device of reporting to the police after will waiting the robber to enter.So anti-theft effect of the present utility model is better.It is other that this anti-theft device can be installed in locks such as various doors, window, cabinet, drawer easily, and the structure of former lock need not done any change.
The utility model also can carry out remote monitoring by external socket, and its working environment can adapt to indoor or outdoors, severe winter or heat between-25 ℃-50 ℃.
Shell of the present utility model and bonnet are by injection mo(u)lding, its rear cover structure is as follows: bonnet is a sphere, making sphere be divided into fritter with the way of cutting apart disjunctor constitutes, link to each other by narrow groove between fritter, when being subjected to external force, be subjected to displacement between the fritter, the radian of sphere is changed, this deformable sphere can be that the safety helmet that the inner chamber curvature differs is complementary with any style just like this.In the time of in being installed in cap, thereby sphere reaches fixing with interior the connection by double sticky tape of cap.This two-sided subsides connect, and also can stick on alarm easily by the lock of door, window, cabinet, drawer etc.If the alarm button is inserted between waist on the belt or in the coat pocket,, just can handle very skillfully as long as insert " bow " shape spring chuck (likeness in form key chain) in the front of shell.So bonnet of the present utility model has thoroughly solved mounting hardness, do not need on cap, to hole, and taken into account wear and install convenient.
In a word, electric property of the present utility model is reliable and stable, and power consumption is few, uses small-sized button cell to make power supply, and the time of continuous working can reach 2 years.The receiving antenna of sensor circuit is miniature built-in, and this just makes machine volume also microminiaturized.Can be used as its Pasting of alarming in short range of electric power device in safety helmet, also can wear with oneself; Use as the door lock alarm, can stick on by the lock of door, window, cabinet, drawer etc. easily again; So use value is high.
Description of drawings
Fig. 1 is the synoptic diagram of each leading foot of JL-20 integrated circuit (IC) chip, and wherein pin 7 is integrated circuit ground end V
SS, pin 17 is integrated circuit anode V
DD
Fig. 2 (A) is that the DIP (biserial) of JL-20 integrated circuit encapsulates wherein each pin Pareto diagram of a kind of form.The label of the claims in this patent book, instructions, Figure of description, specification digest, each pin of the related JL-20 integrated circuit of Figure of abstract is all arranged according to this, i.e. the arrangement label of pin 18DIP (biserial) encapsulation is a standard.Fig. 2 (B) is each pin Pareto diagram of another kind of JL-20 integrated circuit DIP (biserial) encapsulation.
Fig. 3 is the electrical schematic diagram of the utility model embodiment.
Fig. 4 is an outside drawing of the present utility model.
Fig. 5 is the diagrammatic sketch behind " bow " shape elasticity folder on Fig. 4 plug-in mounting.
Fig. 6 is a utility model bonnet sphere outside drawing.
Fig. 7 pastes view behind the double sticky tape for Fig. 6.
Fig. 8 is the A place enlarged drawing of Fig. 5.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
See shown in Fig. 1-3 that the utility model embodiment has two groups of induction of signal receiving circuits, be connected the resistance R between the pin 1 and pin 17 in the JL-20 integrated circuit
1, R
2, capacitor C
1, inductor A
1First group of induction receiving processing circuit having formed partial pressure type, relatively low impedance, inductor A
1Be built-in miniature coils, also available other form substitutes.When be superimposed upon induced signal that branch presses greater than the JL-20 integrated circuit in during the fixing threshold value of pin 1, JL-20 integrated circuit startup work, within the specific limits, the size of electric resistance partial pressure value has determined the size of induction sensitivity.Be connected the resistance R between the pin 2 and pin 17 in the JL-20 integrated circuit
3, R
4, capacitor C
2, inductor A
2Another road partial pressure type of forming, the sensor circuit and the input treatment circuit of relatively low input impedance, principle of work is the same, wherein resistance R
1And R
2And resistance R
3And R
4Deliver to pin 1 and pin 2 respectively from the partial pressure value that the pin 17 of JL-20 integrated circuit is obtained, the size of partial pressure value has determined the size of induction sensitivity within the specific limits, when external signal after pin 1 and pin 2 enter in by the JL-20 integrated circuit, determining of the determining of the signal true and false, signal magnitude carried out to it in circuit inside, whether final decision output alarm signal, and the alerting signal of which kind of tone of output.By the resistance R that is connected pin 3 in the JL-20 integrated circuit, pin 4, pin 8
5, R
6, R
7, capacitor C
3, C
4And triode T
1The switching regulator mu balanced circuit of forming, wherein pin 5 meets V
SS, be connected with resistance R between pin 3 and the pin 4
5, R
6And capacitor C
3, be connected on the resistance R on the pin 8
7With triode T
1Base stage connect triode T
1Collector and anode between the cross-over connection capacitor C
4, triode T
1Emitter connect battery cathode, resistance R
5And R
6Partial pressure value deliver to the pin 4 of JL-20 integrated circuit, after treatment, by pin 8 output signals, reach the voltage stabilizing purpose, voltage of voltage regulation can be debugged about 2.5V, provides the cell voltage of power supply can be between 3.5V～2.6V, when cell voltage is reduced to about 2.6V, alarm can send a kind of special tone, prompting changing battery.The time-base oscillation circuit is by the capacitor C that is connected on JL-20 integrated circuit pin 11, the pin 10
6, resistance R
10And connect to form with pin 12, the frequency about 2KHz is provided.Sound generating circuit is by the resistance R that is connected on the JL-20 integrated circuit pin 9
8, R
9, triode T
2, inductance L and light emitting diode D
1, D
2Form with piezo SP and external socket J, wherein triode T
2Base stage connecting resistance R
8, collector also is connected with resistance R
9With inductance L polyphone branch road, piezo SP, light emitting diode D
1, D
2Link to each other with external socket J and with the negative pole of power supply, emitter connects anode, uses when wherein external socket J can be used as Long-distance Control.By the switch SW that is connected between JL-20 integrated circuit pin 13 and the pin 14
1The tone changing circuit of forming alarm.Be connected the resistance R on the JL-20 integrated circuit pin 6,15
11, R
12, capacitor C
7, C
8, C
9, diode D
3, D
4And switch SW
2Three working positions self check, alarming in short range of electric power, the door lock warning change-over circuit formed, wherein the negative pole of diode D3 is connected with pin 6, the other end and resistance R
12, capacitor C
7Connect resistance R
12The other end and pin 18V
DDConnect capacitor C
7Positive pole and capacitor C
8Connect capacitor C
8The other end, diode D
4Positive pole and pin 7V
SSConnect diode D
4The other end be connected resistance R with pin 15
11Be connected between pin 15 and the pin 18, with inductor A
1The capacitor C that connects
9By shielding line PB and switch SW
2Connect, when pin 6 and pin 15 are connected for differentiating circuit, resistance R
11Be pull-up resistor, R
11With C
7Long-pending each duration of decision door lock alarm sound.Work as switch SW
2When " 1 ", be the self check state, illustrate that as sending normal chimes of doom complete machine work is good this moment; Work as switch SW
2When " 2 ", use as the alarming in short range of electric power device; Work as switch SW
2When " 3 ", use as the door lock alarm, built-in inductor A
1 Battery cover board 3 from shell 1 is pulled out, and peels off the insulation course of its end, and is connected with metal latch, and as the input of picking lock signal, alarm is reported to the police immediately, and the time-delay certain hour, reaches antitheft purpose.
See housing 1 shown in Fig. 4-7 and bonnet 2, the switch SW that reports to the police for self check, alarming in short range of electric power, door lock in the top 4, left side of shell 1
2, below 5 is the switch SW of pitch conversion
1, 3 is battery cover board in the middle of the top.When needs are carried in the coat pocket or between waist on the belt time, can be with reference to " bow " shape elasticity folder 6 on Fig. 5 plug-in mounting; In the time of in need are fixed on safety helmet or by the door lock, paste double sticky tape 7, just can easily alarm be fixed by Fig. 7, need not use " bow " shape elasticity folder 6 this moment, otherwise can make the enlarged in thickness of alarm, behind the safety helmet of particularly packing into, can make useful space minimizing in the cap.When reporting to the police as door lock, built-in inductor A
18 can take out below battery cover 3, when using as the alarming in short range of electric power device, do not take out built-in inductor A
18.
Fig. 8 is the sectional view that connects between two fritters in the utility model bonnet 2 variable radian spheres, on sphere, cut apart many fritters, fritter links to each other by narrow groove with fritter, as long as the thickness H of bottom portion of groove is enough thin, as 0.3mm～0.5mm, when fritter is under pressure, will make narrow groove become narrower, because the fritter that sphere is cut apart is more, the groove between per two fritters only needs deformation in a small amount, and the radian of so whole sphere has just changed.The variable radian sphere bonnet 2 that uses this structure to make, though around the injecting formed plastic shell certain rigidity is arranged, the sphere position is flexible, this has become convertibility with regard to the inalterability that makes the bonnet profile.When stick double sticky tape 7 at sphere, just can be with the safety helmet close adhesion of the different curvatures of various inner chambers, if will stick on the plane on door lock next door, sphere also deformable is that part plan makes it to paste fixing.
Claims (3)
1, a kind of nearly electricity, the dual-purpose alarm of door lock, comprise the plastic casing (1) and the bonnet (2) of sensor circuit, time-base oscillation circuit, tone changing circuit, sound generating circuit and the injection molded be made up of JL-20 integrated circuit and peripheral cell, the time-base oscillation circuit is by the capacitor C that is connected on JL-20 integrated circuit pin 11, the pin 10
6, resistance R
10And connect to form with pin 12; The tone changing circuit is by the switch SW that is connected between JL-20 integrated circuit pin 13 and the pin 14
1Form; Sound generating circuit is by the resistance R that is connected on the JL-20 integrated circuit pin 9
8, R
9, triode T
2, inductance L and light emitting diode D
1, D
2Form with piezo SP and external socket J, wherein triode T
2Base stage connecting resistance R
8, collector also is connected with resistance R
9With inductance L polyphone branch road, piezo SP, light emitting diode D
1, D
2Link to each other with external socket J and with the negative pole of battery, emitter connects anode; It is characterized in that: also have the resistance R that is connected between pin 1 in the JL-20 integrated circuit, pin 2 and the pin 17
1, R
2, capacitor C
1, inductor A
1And resistance R
3, R
4, capacitor C
2, inductor A
2Sensor circuit and input treatment circuit, the wherein resistance R of the relatively low input impedance of forming of two-way partial pressure type
1And R
2And resistance R
3And R
4Deliver to pin 1 and pin 2 respectively from the partial pressure value that the pin 17 of JL-20 integrated circuit is obtained, the size of partial pressure value has determined the size of induction sensitivity within the specific limits; By the resistance R that is connected pin 3 in the JL-20 integrated circuit, pin 4, pin 8
5, R
6, R
7, capacitor C
3, C
4And triode T
1The switching regulator mu balanced circuit of forming, wherein pin 5 meets VSS, is connected with resistance R between pin 3 and the pin 4
5, R
6And capacitor C
3, be connected on the resistance R on the pin 8
7With triode T
1Base stage connect triode T
1Collector and anode between the cross-over connection capacitor C
4, triode T
1Emitter connect battery cathode, resistance R
5And R
6Partial pressure value deliver to the pin 4 of JL-20 integrated circuit, after treatment, by pin 8 output signals; By the resistance R that is connected on the JL-20 integrated circuit pin 6,15
11, R
12, capacitor C
7, C
8, C
9, diode D
3, D
4And switch SW
2Three working positions self check, alarming in short range of electric power, door lock warning change-over circuit, wherein the diode D that form
3Negative pole be connected the other end and resistance R with pin 6
12, capacitor C
7Connect resistance R
12The other end is connected capacitor C with pin 18VDD
7Positive pole and capacitor C
8Connect capacitor C
8The other end, diode D
4Positive pole be connected diode D with pin 7VSS
4The other end be connected resistance R with pin 15
11Be connected between pin 15 and the pin 18, with inductor A
1The capacitor C that connects
9By shielding line PB and switch SW
2Connect, when pin 6 and pin 15 are connected for differentiating circuit, resistance R
11Be pull-up resistor, R
11With C
7Long-pending each duration of decision door lock alarm sound; Described bonnet is the bonnet of variable radian sphere, and bonnet is pasted other attachment by double sticky tape.
2, nearly electricity according to claim 1, the dual-purpose alarm of door lock is characterized in that: switch SW
2When being allocated to the door lock alert locations, built-in inductor A
1(8) battery cover board (3) from the shell (1) is pulled out, and peels off the insulation course of its end, and is connected with metal latch.
3, nearly electricity according to claim 1, the dual-purpose alarm of door lock, it is characterized in that: the bonnet of described variable radian sphere (2), be divided into plurality of small blocks, linked to each other by narrow groove between the fritter, sphere is connected with slim in appearance or thickening type double sticky tape, pressure sensitive adhesive or thicken combined double-sided adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03222241 CN2674561Y (en) | 2003-05-27 | 2003-05-27 | Dual-purpose alarm for electricity and door lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03222241 CN2674561Y (en) | 2003-05-27 | 2003-05-27 | Dual-purpose alarm for electricity and door lock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2674561Y true CN2674561Y (en) | 2005-01-26 |
Family
ID=34473068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03222241 Expired - Fee Related CN2674561Y (en) | 2003-05-27 | 2003-05-27 | Dual-purpose alarm for electricity and door lock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2674561Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931765A (en) * | 2015-06-30 | 2015-09-23 | 国家电网公司 | Proximity alarm wrist guard |
| CN110531647A (en) * | 2018-05-25 | 2019-12-03 | 延边大学 | A kind of universal type industrial alarm circuit and its control method |
-
2003
- 2003-05-27 CN CN 03222241 patent/CN2674561Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931765A (en) * | 2015-06-30 | 2015-09-23 | 国家电网公司 | Proximity alarm wrist guard |
| CN110531647A (en) * | 2018-05-25 | 2019-12-03 | 延边大学 | A kind of universal type industrial alarm circuit and its control method |
| CN110531647B (en) * | 2018-05-25 | 2022-04-01 | 延边大学 | Universal industrial alarm circuit and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |