CN109816915A - A kind of fire acousto-optic alarm circuit - Google Patents
A kind of fire acousto-optic alarm circuit Download PDFInfo
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Abstract
The present invention relates to fire technical field of circuit control, it is intended to provide a kind of fire acousto-optic alarm circuit, its key points of the technical solution are that including the power supply module for converting alternating current to direct current, the output end of the power supply module is connected with the control unit for receiving signal and output control signal, described control unit is connected with the sound module for issuing acoustical signal alarm and the light emitting module for issuing light alarm, and the coupling element of isolation input end and output end is separately provided between described control unit and the sound module, the light emitting module.The present invention is suitable for generating the audible alarm and flashing light alarm at fire incident scene, the place that low visibility or the scene of the accident have smog to generate when being particularly suitable for alarm.
Description
Technical field
The present invention relates to fire technical field of circuit control, more specifically, it relates to which a kind of fire acousto-optic alarm is electric
Road.
Background technique
Fire acousto-optic alarm is used to cause an accident the audible alarm and flashing light alarm at scene, is particularly suitable for energy when alarm
The place that degree of opinion is low or the scene of the accident has smog to generate.
After scene occurs fire and confirms, the fire acousto-optic alarm installed at the scene can be by the fire of fire protection control center
The starting of calamity alarm controller, issues strong sound and light alarm signal, to achieve the purpose that Field Force is reminded to pay attention to.It is sent out when work
Dazzling flashing signal and the acoustic alarm signal greater than 85dB out remind Field Force to have fire behavior or emergency escape evacuation.
The installation site of fire acousto-optic alarm is preferably located at each floor aisle close to the position of stairexit, each fire prevention point
Area at least installs one, and guarantees that any position can hear alarm sound in subregion.
But the circuit in fire acousto-optic alarm, because of the parameter of component and drift, environment noise of supply voltage etc.
Reason is easy to be interfered, and even resulting in fire acousto-optic alarm can not work normally, and influences the orderly progress of fire-fighting work.
Summary of the invention
The object of the present invention is to provide a kind of fire acousto-optic alarm circuit, the operation is stable has stronger anti-interference
Ability can not work normally to avoid fire acousto-optic alarm, influence the orderly progress of fire-fighting work.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of fire acousto-optic alarm electricity
Road, including the power supply module for converting alternating current to direct current, the output end of the power supply module is connected with for receiving
Signal and output control signal control unit, described control unit be connected with for issue acoustical signal alarm sound module and
For issuing the light emitting module of light alarm, between described control unit and the sound module, the light emitting module respectively
It is provided with the coupling element for isolation input end and output end.
By using above-mentioned technical proposal, power supply module provides working power for control unit, and control unit passes through coupling
Element is connect with sound module, light emitting module, and to control, sound module issues acoustical signal alarm, light emitting module issues optical signal report
It is alert, meanwhile, coupling element plays the role of that control unit and sound module, light emitting module, strong antijamming capability, Jin Erhuo is isolated
Calamity acoustooptic alarm circuit the operation is stable has strong anti-interference ability, and reducing fire acousto-optic alarm can not normal work
The case where making appearance orderly carries out with being conducive to fire-fighting work.
Preferably, the coupling element is respectively LMDS Light Coupled Device G1 and LMDS Light Coupled Device G2, the LMDS Light Coupled Device G1
Light-receiving device end connect with described control unit, the photophore end of the LMDS Light Coupled Device G1 is connect with the sound module, institute
The photophore end for stating LMDS Light Coupled Device G2 is connect with described control unit, the light-receiving device end of the LMDS Light Coupled Device G2 and the hair
Optical module connection.
By using above-mentioned technical proposal, LMDS Light Coupled Device G1 make to realize between control unit and sound module electrically every
From LMDS Light Coupled Device G2 makes to realize electrical isolation between control unit and light emitting module, strong antijamming capability, the operation is stable, nothing
Contact, long service life, efficiency of transmission are high.
Preferably, described control unit is single-chip microcontroller IC1 and its model 12F675, the Vdd pin of the single-chip microcontroller IC1
It is connect with the output end of the power supply module, the GP4/AN3 pin of the single-chip microcontroller IC1 is connect with the sound module, described
The GP5 pin of single-chip microcontroller IC1 is connect with the light emitting module.
By using above-mentioned technical proposal, single-chip microcontroller IC1 is the double direct insertion single-chip microcontrollers of 88 feet, and control is simple, at low cost,
Meet the performance requirement of fire acousto-optic alarm, conducive to the design for simplifying report device circuit.
Preferably, the power supply module includes rectifier bridge DR1 and triode T1, the input terminal of the rectifier bridge DR1 and total
Line connection, the cathode output end of the rectifier bridge DR1 are connect with the collector of the triode T1.
By using above-mentioned technical proposal, rectifier bridge DR1 converts alternating current to direct current, and in proportion through triode T1
Output makes power supply module control unit provide working power to provide the voltage for meeting control unit work.
Preferably, described control unit is also connected with for providing the letter in different working signal sources for the light emitting module
Source module.
By using above-mentioned technical proposal, information source module can provide different working signal sources for light emitting module, make to shine
Module shines to some extent, and then when fire occurs, the light source of light emitting module is bright and flashes, and plays better warning function.
Preferably, the information source module includes triode T2, and the base stage of the triode T2 is through resistance R3 connection single-chip microcontroller
The GP0/AN0 pin of IC1, the base stage of the triode T2 is through the GP2/AN2 pin of resistance R4 connection single-chip microcontroller IC1, and described three
The collector of pole pipe T2 connects the GP1/CIN pin of single-chip microcontroller IC1 through resistance R5 with resistance R7.
By using above-mentioned technical proposal, the base stage of triode T2 exports the first signal, the base of triode T2 through resistance R3
Pole exports second signal through resistance R4, and the collector of triode T2 exports third signal through resistance R5 and resistance R7, to be luminous
Module provides different working signal sources.
Preferably, diode TV1 is connected between two output ends of the rectifier bridge DR1, the diode TV1 is wink
State inhibits diode.
By using above-mentioned technical proposal, Transient Suppression Diode diode TV1 has high current ducting capacity, its two
When pole is by reversed transient state high energy impact events, the high impedance of its two interpolar can be become into Low ESR with flank speed, to absorb one
A instantaneous large-current, the voltage clamping at the both ends diode TV1 one it is scheduled numerically, and then fire acousto-optic alarm electricity
Road can export stable power supply source, strong antijamming capability.
Preferably, the base stage of the triode T1 is grounded through diode W1, and the diode W1 is zener diode.
By using above-mentioned technical proposal, after zener diode W1 is reversed breakdown using diode, in certain reversed electricity
Backward voltage does not change the progress pressure stabilizing of this feature with reverse current in stream range, exports the emitter of triode T1 and stablizes electricity
Pressure, and then fire acousto-optic alarm circuit can export stable power supply source, strong antijamming capability.
In conclusion the invention has the following advantages:
When fire occurs, power supply module is connected in fire alarm control unit starting, the loop bus of fire alarm control unit, will
Alternating current is converted to direct current and exports the voltage for meeting control unit work, meanwhile, information source module conducting is through control unit
Light emitting module provides different working signal sources.
Control unit is in running order, and to coupling element input electrical signal, coupling element makes control unit and luminous mould
It is connected between block, between control unit and sound module, to enhance the anti-interference ability of fire acousto-optic alarm circuit, Jin Erhuo
Calamity acoustooptic alarm circuit the operation is stable has strong anti-interference ability, and reducing fire acousto-optic alarm can not normal work
The case where making appearance orderly carries out with being conducive to fire-fighting work.
Light emitting module shines under the different operating signal source of information source module, and light source is bright and flashes；Sound module sending sound
Signal alarm so that fire acousto-optic alarm issues strong sound and light alarm signal achievees the purpose that Field Force is reminded to pay attention to.
Detailed description of the invention
Fig. 1 is the circuit connection diagram of a kind of power supply module of fire acousto-optic alarm circuit, control unit and information source module；
Fig. 2 is the circuit connection diagram of a kind of light emitting module of fire acousto-optic alarm circuit, sound module and LMDS Light Coupled Device.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
It referring to Fig.1, is a kind of fire acousto-optic alarm circuit disclosed by the invention, including straight for converting alternating current to
The power supply module of galvanic electricity, power supply module include rectifier bridge DR1 and triode T1, the model MB10F of rectifier bridge DR1, rectifier bridge
There are two input terminal and two output ends, two input terminals of rectifier bridge DR1 to connect respectively with bus by DR1, and the two of rectifier bridge DR1
Diode TV1 is in series between a output end, diode TV1 is Transient Suppression Diode and its model TVS36V, has height
Current capacity, when its two poles of the earth is by reversed transient state high energy impact events, with flank speed by the high resistant resistance of its two interpolar
For Low ESR, to absorb an instantaneous large-current, the voltage clamping at the both ends diode TV1 one it is scheduled numerically, with
Subsequent circuit element is effectively protected not by the destruction of high voltage transient spike.
The cathode output end of rectifier bridge DR1 is connected with diode D1 and resistance R0, the setting of diode D1 forward direction, diode
D1, resistance R0 and triode T1 series connection, the cathode output end through capacitor C1 and rectifier bridge DR1 between diode D1 and resistance R0 connect
It connects, the cathode output end ground connection of rectifier bridge DR1 connects between resistance R0 and the collector of triode T1 through capacitor C2 and capacitor C3
Ground, capacitor C2 and capacitor C3 are in parallel, and capacitor C2 is electrolytic capacitor, and the anode of electrolytic capacitor is connect with resistance R0, triode T1's
Resistance R1 is connected between base stage and the collector of triode T1, the emitter of triode T1 connects 5V power supply, triode T1's
Emitter is grounded through capacitor C4 and capacitor C5, and capacitor C4 and capacitor C5 are in parallel.
The base stage of triode T1 is reversely grounded through diode W1, diode W1 be zener diode and its model 5V6, with
The emitter of triode T1 is set to export burning voltage.
The emitter of triode T1 is connected with the control unit for receiving signal and output control signal, and control unit is
Single-chip microcontroller IC1 and its model 12F675, single-chip microcontroller IC1 share Vdd pin, Vss pin, GP0/AN0 pin, GP1/CIN and draw
Foot, GP2/AN2 pin, GP3 pin, GP4/AN3 pin and GP5 pin totally 8 pins, the Vdd pin of single-chip microcontroller IC1 and three poles
The emitter of pipe T1 connects, and the Vdd of single-chip microcontroller IC1 draws foot meridian capacitor C6 ground connection.
The cathode output end connection of rectifier bridge DR1 is grounded through triode T2, and the collector of triode T2 is with rectifier bridge DR1's
Cathode output end connection, the emitter of triode T2 are grounded through resistance R2, and the base stage of triode T2 is grounded through capacitor C7, triode
GP0/AN0 pin through resistance R3 connection single-chip microcontroller IC1 between the base stage and capacitor C7 of T2, the base stage and capacitor C7 of triode T2
Between the GP2/AN2 pin through resistance R4 connection single-chip microcontroller IC1, between the collector of triode T2 and the emitter of triode T2
It is grounded through resistance R5 and resistance R6, resistance R5 and resistance R6 series connection, through resistance R7 connection single-chip microcontroller between resistance R5 and resistance R6
The GP1/CIN pin of IC1, is grounded between resistance R5 and resistance R6 through capacitor C8.
Triode T2, resistance R3, resistance R4, resistance R5 and resistance R7 form information source module, for mentioning for light emitting module
For different working signal sources, keeps the light source of light emitting module bright and flash.
The emitter of triode T1 is connected with plug connector CON6, and plug connector CON6 shares 6 ports, and the 1 of plug connector CON6
Port is connect with the emitter of triode T1, and 2 ports of plug connector CON6 are connect and with the GP3 pin of single-chip microcontroller IC1 through resistance
R8 is connect with the emitter of triode T1, and 3 ports of plug connector CON6 are connect with the GP1/CIN pin of single-chip microcontroller IC1, plug connector
4 ports of CON6 are connect with the GP0/AN0 pin of single-chip microcontroller IC1, the 6 ports ground connection of plug connector CON6.
Referring to Fig. 2, the GP4/AN3 pin of single-chip microcontroller IC1 is connected with LMDS Light Coupled Device G1, and LMDS Light Coupled Device G1 connection is useful
In the sound module for issuing acoustical signal alarm, the GP5 pin of single-chip microcontroller IC1 is connected with LMDS Light Coupled Device G2, LMDS Light Coupled Device G2
It is connected with the light emitting module for issuing light alarm, LMDS Light Coupled Device G1, LMDS Light Coupled Device G2 are coupling element and model
It is PC817, to be used for electrical isolation input terminal and output end, optical coupling element includes photophore and light-receiving device.
The both ends of the light-receiving device of LMDS Light Coupled Device G1 are connect with the GP4/AN3 pin of single-chip microcontroller IC1 and the earth respectively, to rise
To the effect of isolation single-chip microcontroller IC1 and sound module, the conversion of " electrical-optical-electrical " is realized, the analog voltage of consecutive variations is transmitted
Or current signal；The light-receiving device of LMDS Light Coupled Device G2 has both ends, and wherein one end connects through the GP5 pin of resistance R10 and single-chip microcontroller IC1
It connects, the other end is connect with the earth, to play the role of that single-chip microcontroller IC1 and light emitting module is isolated.
The photophore of LMDS Light Coupled Device G1 has both ends, and wherein one end is through resistance R9 and the one of the photophore of LMDS Light Coupled Device G2
End connection, other end ground connection, one end of the photophore of LMDS Light Coupled Device G2 is connected with triode T3 and triode through resistance R11
T4, resistance R11 are connect with the base stage of triode T3, and the emitter of triode T3 is grounded through resistance R13, the base stage of triode T3 with
Resistance R12 and capacitor C9 are connected between emitter, resistance R12 and capacitor C9 are arranged in parallel and one end is grounded, triode T3
Emitter be connected with triode T5 through resistance R18, the emitter of triode T3 is connect with the base stage of triode T4, triode T4
Base stage be grounded through capacitor C10, the emitter of triode T4 ground connection, the collector of triode T4 is connected with luminous through resistance R15
Diode E1, light emitting diode E2 and light emitting diode E3, light emitting diode E1, light emitting diode E2 and light emitting diode E3 string
Join and oppositely arranged, the both ends of resistance R15 are parallel with resistance R14, are connected between light emitting diode E1 and light emitting diode E3
Resistance R16, the anode of light emitting diode E3 are connected with rectifier bridge DR2, the cathode output end of light emitting diode E3 and rectifier bridge DR2
Connection, is connected with capacitor C11 between the cathode output end and cathode output end of rectifier bridge DR2, capacitor C11 is electrolytic capacitor, electricity
The anode for holding C11 is connect with the cathode output end of rectifier bridge DR2, the cathode ground connection of capacitor C11, two inputs of rectifier bridge DR2
End is separately connected port.
It is grounded between light emitting diode E3 and rectifier bridge DR2 through diode TV2, diode TV2 is Transient Suppression Diode
And its model TVS36V, diode TV2 has high current ducting capacity, at its two poles of the earth by reversed transient state high energy impact events
When, the high impedance of its two interpolar is become by Low ESR with flank speed, to absorb an instantaneous large-current, diode TV2 two
The voltage clamping at end one it is scheduled numerically, to be effectively protected subsequent circuit element not by high voltage transient spike
Destruction.
Light emitting diode E1, light emitting diode E2 and light emitting diode E3 form light emitting module, for issuing optical signal
Alarm.
Resistance R18 is connect with the emitter of triode T5, and the port of the photophore of LMDS Light Coupled Device G2 is with triode T5's
Controller U1 is connected between collector, the model L9110 of controller U1, controller U1 share OUT pin, GND pin, Vs
Pin ,+IN pin ,-IN pin, BY pin, GAIN pin and GAIN pin totally 8 pins, the photophore of LMDS Light Coupled Device G2
Port connect with-IN the pin of controller U1 ,-IN the pin of controller U1 connects through the emitter of resistance R17 and triode T5
It connecing ,+IN the pin of controller U1 is connect with-IN the pin of controller U1, OUT pin, the GAIN pin handover ground of controller U1,
Another GAIN pin of controller U1 is connected with sound device DS1, and sound device DS1 is sound module, for issuing sound letter
Number alarm, sound device DS1 one end connection controller U1 GND pin, the base stage of triode T5 is through capacitor C12, resistance R22
It is grounded with resistance R23, capacitor C12, resistance R22 and resistance R23 are arranged in series, and the both ends of resistance R23 are parallel with capacitor C14, electricity
One end of resistance R17 is grounded through capacitor C16, and one end of resistance R17 is grounded through capacitor C17.
Controller U1 is two channel push-pull type power amplification specific integrated circuits of control and driving sound device DS1 design
Device, peripheral components cost reduces, whole aircraft reliability is high, have biggish current driving ability, with good anti-interference,
With lower output saturation voltage drop, securely and reliably.
The anode of light emitting diode E3 is connected with microcontroller U2, the model of microcontroller U2 through resistance R19
MC34063, microcontroller U2 share C1 pin, IS pin, IN pin, REF pin, C2 pin, E2 pin, CAP pin and GND
Totally 8 pins, resistance R19 are connect pin with the IS pin of microcontroller U2, the C1 pin and microcontroller U2 of microcontroller U2
IS pin connected with the C2 pin of microcontroller U2, the anode of light emitting diode E3 is connect with the IN pin of microcontroller U2,
The IN of microcontroller U2 draws foot meridian capacitor C13 ground connection, and the REF pin of microcontroller U2 is grounded through resistance R20, microcontroller U2's
GND pin ground connection, the CAP of microcontroller U2 draw foot meridian capacitor C14 ground connection, and the E2 pin of microcontroller U2 connects through diode D2
Ground, diode D2 is oppositely arranged, and the E2 pin of microcontroller U2 is connected with microcontroller U3 through inductance L1, microcontroller U2's
REF pin is connect through resistance R21 with inductance L1, and one end of inductance L1 is grounded through capacitor C15, other end connection controller U1-
IN pin, capacitor C15 are electrolytic capacitor, and the anode of capacitor C15 is connect with inductance L1, the cathode ground connection of capacitor C15.
Microcontroller U2 is a monolithic bipolar Linear integrated circuit, is exclusively used in DC-DC converter control section, by
The DC/DC converter that it is constituted only uses a small amount of external component, contains the list of major function required for DC/DC converter
Piece control circuit if any the controllable oscillator of the pedestal generator, comparator, duty cycle of temperature self-compensation function,
R-S trigger and High-current output switching circuit etc., it is cheap.
The model LARM DAC of microcontroller U3, microcontroller U3 share Vdd pin, WM1 pin, Mode pin,
Totally 8 pins, inductance L1 and the Vdd of microcontroller U3 draw for Vreg pin, GND pin, IOP pin, OKY1 pin and IO2 pin
Foot connection, resistance R22 are connect with the IOP pin of microcontroller U3, and the WM1 pin and the Vs of microcontroller U1 of microcontroller U3 draws
Foot connection, the Mode pin of microcontroller U3 are connect with the BY pin of microcontroller U1, and the Vreg pin of microcontroller U3 is through electricity
Hold C18 ground connection, GND pin, OKY1 pin and the IO2 pin of microcontroller U3 is grounded.
Microcontroller U3 provides a series of kernels, system expanding, micro- CPU and System on Chip/SoC method, and functional module is for life
It produces manufacturer and configures production according to the requirement of not same subscriber, all over products is all made of 1 general software architecture, can be effectively
The time for shortening application program research and development and test, reduce R & D Cost.
The implementation principle of the present embodiment are as follows: when fire occurs, fire alarm control unit starting, fire alarm control unit
Power supply module is connected in loop bus.
Alternating current in loop bus is converted to direct current and met through the output of the emitter of triode T1 by rectifier bridge DR1
The voltage of single-chip microcontroller IC1 work, meanwhile, to information source module input signal, information source module between two output ends of rectifier bridge DR1
Make light emitting diode E1, light-emitting diodes to single-chip microcontroller IC1 output signal to provide different working signal sources for light emitting module
Pipe E2 and light emitting diode E3 flashing.
Meanwhile single-chip microcontroller IC1 is in running order, and inputs telecommunications to LMDS Light Coupled Device G1, LMDS Light Coupled Device G2 respectively
Number, LMDS Light Coupled Device G1, LMDS Light Coupled Device G2, which convert electrical signals to optical signal and amplify again, is converted to electric signal output, so that single
It is connected between piece machine IC1 and light emitting module, between single-chip microcontroller IC1 and sound module, enhancing fire acousto-optic alarm circuit resists
Interference performance, and then fire acousto-optic alarm circuit the operation is stable, have strong anti-interference ability, it is alert to reduce fire acousto-optic
The case where report device can not work normally appearance, orderly carries out with being conducive to fire-fighting work.
At this point, electric signal is exported through triode T3 and triode T4, driving light emitting diode E1, light emitting diode E2 and hair
Optical diode E3 shines, and light source is bright and flashes；Meanwhile microcontroller U2 carries out DC-dc conversion, for sound device DS1
Operating voltage, controller U1 and microcontroller U3 control and driving sound device DS1 work, sound device DS1 sending sound are provided
Signal alarm so that fire acousto-optic alarm issues strong sound and light alarm signal achievees the purpose that Field Force is reminded to pay attention to.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of fire acousto-optic alarm circuit, it is characterized in that: include the power supply module for converting alternating current to direct current,
The output end of the power supply module is connected with the control unit for receiving signal and output control signal, and described control unit connects
Be connected to the sound module for issuing acoustical signal alarm and light emitting module for issuing light alarm, described control unit with
The coupling element of isolation input end and output end is separately provided between the sound module, the light emitting module.
2. a kind of fire acousto-optic alarm circuit according to claim 1, it is characterized in that: the coupling element is respectively light
Coupled apparatus G1 and LMDS Light Coupled Device G2, the light-receiving device end of the LMDS Light Coupled Device G1 are connect with described control unit, the light
The photophore end of coupled apparatus G1 is connect with the sound module, and the photophore end of the LMDS Light Coupled Device G2 and the control are single
Member connection, the light-receiving device end of the LMDS Light Coupled Device G2 is connect with the light emitting module.
3. a kind of fire acousto-optic alarm circuit according to claim 1, it is characterized in that: described control unit is single-chip microcontroller
IC1 and its model 12F675, the Vdd pin of the single-chip microcontroller IC1 are connect with the output end of the power supply module, the monolithic
The GP4/AN3 pin of machine IC1 is connect with the sound module, and the GP5 pin and the light emitting module of the single-chip microcontroller IC1 connects
It connects.
4. a kind of fire acousto-optic alarm circuit according to claim 1, it is characterized in that: the power supply module includes rectification
Bridge DR1 and triode T1, the input terminal of the rectifier bridge DR1 are connect with bus, the cathode output end of the rectifier bridge DR1 and institute
State the collector connection of triode T1.
5. a kind of fire acousto-optic alarm circuit according to claim 3, it is characterized in that: described control unit is also connected with
For providing the information source module in different working signal sources for the light emitting module.
6. a kind of fire acousto-optic alarm circuit according to claim 5, it is characterized in that: the information source module includes three poles
GP0/AN0 pin of the base stage through resistance R3 connection single-chip microcontroller IC1 of pipe T2, the triode T2, the base stage of the triode T2
GP2/AN2 pin through resistance R4 connection single-chip microcontroller IC1, the collector of the triode T2 connect through resistance R5 with resistance R7 single
The GP1/CIN pin of piece machine IC1.
7. a kind of fire acousto-optic alarm circuit according to claim 4, it is characterized in that: two of the rectifier bridge DR1
Diode TV1 is connected between output end, the diode TV1 is Transient Suppression Diode.
8. a kind of fire acousto-optic alarm circuit according to claim 4, it is characterized in that: the base stage of the triode T1 passes through
Diode W1 ground connection, the diode W1 are zener diode.
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| CN201910213661.5A CN109816915A (en) | 2019-03-20 | 2019-03-20 | A kind of fire acousto-optic alarm circuit |
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| CN201910213661.5A CN109816915A (en) | 2019-03-20 | 2019-03-20 | A kind of fire acousto-optic alarm circuit |
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| CN205644871U (en) * | 2016-05-17 | 2016-10-12 | 安徽海圣电气有限公司 | Can realize electric fire monitoring device of self -adaptation residual current control |
| CN205689243U (en) * | 2016-06-02 | 2016-11-16 | 江苏建筑职业技术学院 | A kind of mine curve alarm device based on PIC12F675 chip |
| CN207664592U (en) * | 2017-12-27 | 2018-07-27 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit |
| CN208086995U (en) * | 2018-03-07 | 2018-11-13 | 上海贝思特电气有限公司 | A kind of elevator building floor choosing device |
| CN208353655U (en) * | 2018-05-28 | 2019-01-08 | 重庆九日电子科技有限公司 | The lamp luminescence driving circuit of current adjustment |
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Application publication date: 20190528 |
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