CN106356756A - Comprehensive switch cabinet state indicator - Google Patents
Comprehensive switch cabinet state indicator Download PDFInfo
- Publication number
- CN106356756A CN106356756A CN201610793322.5A CN201610793322A CN106356756A CN 106356756 A CN106356756 A CN 106356756A CN 201610793322 A CN201610793322 A CN 201610793322A CN 106356756 A CN106356756 A CN 106356756A
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- resistance
- switch cabinet
- resistor
- signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B15/00—Supervisory desks or panels for centralised control or display
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a comprehensive switch cabinet state indicator. The comprehensive switch cabinet state indicator comprises an MCU, a photoelectric isolation input circuit, a multichannel switch, a human body induction probe, a human body induction module, a speech driving circuit, a loudspeaker and a display, wherein the speech driving circuit comprises a speech power amplification chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth electrolytic capacitor, a fifth electrolytic capacitor, a sixth capacitor and a first triode, the base of the first triode is connected with one end of the fourth resistor and one end of the fifth resistor through the sixth capacitor, the emitter of the first triode is grounded through the sixth resistor, and the other end of the fourth resistor is grounded. The comprehensive switch cabinet state indicator can effectively realize prompt and alarm about misoperation of a circuit breaker handcart and enhance the safety, is simple in structure and convenient to produce, mount and commission and can reduce noise of audio equipment.
Description
Technical field
The present invention relates to switch cubicle field, particularly to a kind of switch cabinet status comprehensive indicator.
Background technology
Switch cabinet status indicator is developed according to the development of current medium voltage network switch cubicle technology a kind of new many
Functional intellectualization simulates dynamic instruction device.In order to prevent operator's maloperation from leading to equipment and casualties, in high pressure
In switch manufacturing, the technical scheme that adopted enables between chopper and delivery circuit breaker trolley, earthed switch and fortune
Carry and install interlock between circuit breaker trolley.Although this kind of technical scheme enables chopper and is in delivery during "on" position
The dolly of chopper is immovable, and when the dolly of delivery chopper is between operating position and experimental site, chopper does not close
Lock, and can prevent electricity from closing earthed switch and earthed switch push delivery chopper dolly when closing a floodgate, but machinery is in system
Make and be difficult to reach required precision, in use, certainly exist abrasion, therefore inevitably fault, if alarm free dress
Put, will certainly have an accident when interlock breaks down.
For in the speech audio drive circuit in switch cabinet status indicator, master control mcu exports voice signal, through filtering
Ripple and gain are amplified, and as the input signal of phonetic speech power amplifier, export to drive after the process of sound power amplifier
Dynamic audio frequency apparatus.But in the middle of actual application, because master control mcu is in addition to driving phonetic speech power amplifier, also often carry it
He loads, such as digital screen, motor etc., while master control mcu exports audio signal, also exports to drive other larger negative
Carry the drive signal of (as digital screen, motor etc.), the audio frequency in order to drive phonetic speech power amplifier of now master control mcu output is believed
Number then it is possible that fluctuation or noise, the small fluctuation being mingled with drive signal or noise are through phonetic speech power amplifier
Gain exports to audio frequency apparatus after amplifying, then audio frequency apparatus can be led to larger noise.
Content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, provides one kind effectively real
The prompting of existing circuit breaker cart maloperation and warning, the safety strengthening switch cabinet status comprehensive indicator, structure is simple, be easy to
Make, install and debug the switch cabinet status comprehensive indicator of noise convenient, that audio frequency apparatus can be reduced.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of switch cabinet status comprehensive indicator,
Including mcu, phototube coupling input circuit, multi-channel switch, human body sensing probe, human body induction module, voice driven circuit,
Speaker and display screen, when the distance of people and switch cubicle is in set point, the luminosity that described human body sensing probe will sense
Signal is converted to level variable signal by described human body induction module, and described human body induction module is by described level variable signal
Described mcu, the first switch cabinet state letter outside described phototube coupling input circuit reception are sent to by multi-channel switch
Number, first switch cabinet status signal is carried out level conversion and obtains second switch cabinet status signal, and by described second switch cabinet
Status signal is sent to described mcu by described multi-channel switch, after described mcu makes corresponding judgement, to described voice
Drive circuit sends corresponding audio alert signal, and speaker described in described voice driven drives sends audio alert, institute
State display screen to be connected with described mcu；
Described voice driven circuit include phonetic speech power amplification chip, first resistor, second resistance, 3rd resistor, the 4th
Resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electrochemical capacitor, the 5th electrochemical capacitor,
6th electric capacity and the first audion, the base stage of described first audion pass through described 6th electric capacity respectively with described 4th resistance
One end of one end and the 5th resistance connects, and the emitter stage of described first audion passes through described 6th resistance eutral grounding, and the described 4th
The other end ground connection of resistance, the other end of described 5th resistance is connected with described mcu, and the colelctor electrode of described first audion is respectively
It is connected with described one end of first electric capacity and one end of 3rd resistor, one end of the other end of described 3rd resistor and the second electric capacity
It is all connected with the first power supply, the other end ground connection of described second electric capacity, the other end of described first electric capacity is with described by described the
One resistance is connected with one end of described second resistance and a gain pin of phonetic speech power amplification chip respectively, described second resistance
The other end be connected with another gain pin of described phonetic speech power amplification chip, described 3rd electric capacity and the 5th electrochemical capacitor are simultaneously
Connection, its one end in parallel connects second source and phonetic speech power amplification chip, the other end in parallel and described phonetic speech power respectively
Amplification chip connects and is grounded, and the positive pole of described 4th electrochemical capacitor is connected with described phonetic speech power amplification chip, and the described 4th
The minus earth of electrochemical capacitor.
In switch cabinet status comprehensive indicator of the present invention, described voice driven circuit also includes the 8th resistance,
One end of described 8th resistance is connected with described second source, and the other end of described 8th resistance amplifies core with described phonetic speech power
Piece connects.
In switch cabinet status comprehensive indicator of the present invention, described voice driven circuit also includes the 9th resistance,
One end ground connection of described 9th resistance, the other end of described 9th resistance is connected with described phonetic speech power amplification chip.
In switch cabinet status comprehensive indicator of the present invention, described voice driven circuit also includes the tenth resistance,
One end of described tenth resistance is connected with the positive pole of described 4th electrochemical capacitor, the other end of described tenth resistance and described voice
Power amplifier chip connects.
In switch cabinet status comprehensive indicator of the present invention, described voice driven circuit also includes the 11st electricity
Resistance, one end of described 11st resistance is connected with the positive pole of described 4th electrochemical capacitor, the other end of described 11st resistance and
Described phonetic speech power amplification chip connects.
In switch cabinet status comprehensive indicator of the present invention, described first switch cabinet state signal includes high pressure belt
Electric status signals, earthing position signalling, circuit breaker position signal, circuit breaker cart operating position signal and circuit breaker cart are real
Test position signalling.
In switch cabinet status comprehensive indicator of the present invention, described first audion is npn audion.
Implement the switch cabinet status comprehensive indicator of the present invention, having the advantages that will due to human body sensing probe
The photometric signal of sensing is ultimately routed to mcu by human body induction module after conversion, and phototube coupling input circuit will receive
First switch cabinet status signal through conversion after be ultimately routed to mcu, mcu control voice drive circuit drive the speaker sends
Audio alert, compared with prior art, in the case of mechanical interlocks lost efficacy or operator operate ground against regulations by force, can have
Realize to effect prompting and the warning of circuit breaker cart maloperation, thus strengthening the safety of switch cabinet status comprehensive indicator, should
The structure of switch cabinet status comprehensive indicator is simple, is easy to make, and installs and debugging is convenient；Can be filtered by voice driven circuit
Except disturbing produced by the voice audio signals unusual fluctuations of mcu output, so it can be effectively realized circuit breaker cart grasp by mistake
The prompting made and warning, strengthen the safety of switch cabinet status comprehensive indicator, structure is simple, be easy to make, install and debug
Noise convenient, that audio frequency apparatus can be reduced.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation in one embodiment of switch cabinet status comprehensive indicator of the present invention；
Fig. 2 is the electrical block diagram of voice driven circuit in described embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
In switch cabinet status comprehensive indicator embodiment of the present invention, the structural representation of this switch cabinet status comprehensive indicator
Figure is as shown in Figure 1.In Fig. 1, this switch cabinet status comprehensive indicator includes mcu1, phototube coupling input circuit 2, multy-way switching are opened
Close 3, human body sensing probe 4, human body induction module 5, voice driven circuit 6, speaker 7 and display screen 8, wherein, human response
The outfan of probe 4 is connected with the input of human body induction module 5, the outfan of human body induction module 5 and multi-channel switch 3
Input connect, the outfan of phototube coupling input circuit 2 is connected with another input of multi-channel switch 3,
The outfan of multi-channel switch 3 is connected with the input of mcu1, and the input of display screen 8 is with mcu1 outfan even
Connect, another outfan of mcu1 is connected with the input of voice driven circuit 6, the outfan of voice driven circuit 6 with raise one's voice
The input of device 7 connects.
In the present embodiment, human body induction module 5 normally exports 5v voltage, is sent to mcu1 by multi-channel switch 3, when
The distance of people and switch cubicle when in set point (for example: when within five meters of human body range switch cabinet), feel by human body sensing probe 4
The change of ambient light should be arrived, the photometric signal of sensing is converted to level variable signal by human body induction module 5 simultaneously, should
Level variable signal is changed into 0v from 5v signal, and this level variable signal is sent by human body induction module 5 by multi-channel switch 3
To mcu1, mcu1 judges the state of the existing input signal of switch cubicle and powered situation after receiving this level variable signal again,
I.e. switch cubicle location status, earthing location status, the chopper delivery location status of handcart and the state of electrification in high voltage, light
Electric isolution input circuit 2 receives the first switch cabinet status signal of outside, and first switch cabinet status signal is carried out level conversion
(being converted to 5v by 0v) obtains second switch cabinet status signal, and second switch cabinet status signal is passed through multi-channel switch 3
It is sent to mcu1, after mcu1 makes corresponding judgement, send corresponding audio alert signal to voice driven circuit 6, voice drives
Galvanic electricity road 6 drive the speaker 7 sends audio alert, thus ensureing the reliable and secure operation of switch cubicle, display screen 8 is with mcu1 even
Connect, the state for the existing input signal of display switch cabinet and powered situation.
It is noted that first switch cabinet state signal includes electrification in high voltage status signals, earthing position signalling, breaks
Road device position signalling, circuit breaker cart operating position signal and circuit breaker cart experimental site signal, these signals can pass through
Multi-channel switch 3 gates wherein one road signal and delivers to mcu1.Compared with prior art, lost efficacy in mechanical interlocks or operated
Prompting and the warning of circuit breaker cart maloperation in the case of personnel operate ground against regulations by force, can be effectively realized, thus enhancing
The safety of switch cubicle operation.The structure of this switch cabinet status comprehensive indicator is simple, is easy to make, and installs and debugging is more square
Just.
Fig. 2 is the electrical block diagram of voice driven circuit in the present embodiment, and in Fig. 2, this voice driven circuit 6 includes
Phonetic speech power amplification chip u1, first resistor r1, second resistance r2,3rd resistor r3, the 4th resistance r4, the 5th resistance r5,
Six resistance r6, the first electric capacity c1, the second electric capacity c2, the 3rd electric capacity c3, the 4th electrochemical capacitor c4, the 5th electrochemical capacitor c5, the 6th
The base stage of electric capacity c6 and the first audion q1, the first audion q1 pass through the 6th electric capacity c6 respectively with one end of the 4th resistance r4 and
One end of 5th resistance r5 connects, and the emitter stage of the first audion q1 passes through the 6th resistance r6 ground connection, and the 4th resistance r4's is another
End ground connection, the other end of the 5th resistance r5 is connected with mcu1.
The colelctor electrode of the first audion q1 is connected with one end of the first electric capacity c1 and one end of 3rd resistor r3 respectively, and the 3rd
One end of the other end of resistance r3 and the second electric capacity c2 is all connected with the first power supply vcc, and the other end of the second electric capacity c2 is grounded, and first
The other end of electric capacity c1 with by first resistor r1 respectively with one end of second resistance r2 and phonetic speech power amplification chip u1 one
Gain pin connects, and the other end of second resistance r2 is connected with another gain pin of phonetic speech power amplification chip u1, the 3rd electricity
Hold c3 and the 5th electrochemical capacitor c5 in parallel, its one end in parallel connects second source vdd and phonetic speech power amplification chip u1 respectively,
The other end in parallel is connected and is grounded with phonetic speech power amplification chip u1, and the positive pole of the 4th electrochemical capacitor c4 is amplified with phonetic speech power
Chip u1 connects, the minus earth of the 4th electrochemical capacitor c4.
Above-mentioned 6th resistance r6 is current-limiting resistance, and the branch road for the emitter stage place to the first audion q1 carries out excessively stream
Protection, improves the safety and reliability of this switch cabinet status comprehensive indicator.6th electric capacity c6 is coupled capacitor, is used for preventing the
Interference between one audion q1 and mcu1.
Wherein, the first audion q1,3rd resistor r3, the 4th resistance r4, the 5th resistance r5, the second electric capacity c2 and the 6th electricity
Hold c6 and constitute Dolby circuit, for filtering the wave noise of the audio alert signal of mcu1 output, the audio alert of mcu1 output
Signal as the control signal of the first audion q1, when the voltage of the audio alert signal of mcu1 output is more than the first audion q1
Conducting voltage when, the first audion q1 will turn on, when mcu1 output audio alert signal voltage be less than the one or three pole
During the conducting voltage of pipe q1, the first audion q1 turns off that is to say, that the output of the first audion q1 only has two kinds of letters of on an off
Number, when the first audion q1 conducting, this Dolby circuit exports the low level of 0v, when the first audion q1 turns off, this noise reduction
Its magnitude of voltage of circuit output is equal to the high level of the first power supply vcc, to reach the voice reporting that this Dolby circuit filters mcu1 output
Alert signal is due to disturbing produced by unusual fluctuations.In the present embodiment, structure after the 3rd electric capacity c3 and the 5th electrochemical capacitor c5 parallel connection
Power circuit, second resistance r2 and the 7th resistance r7 is become to constitute gain amplifying circuit, first resistor r1 and the first electric capacity c1 series connection
Constitute high-pass filtering circuit afterwards.
Above-mentioned Dolby circuit can filter the audio alert abnormal signal fluctuation of the audio alert signal output of mcu1 output
Produced interference, the audio alert signal of mcu1 output first passes around Dolby circuit, then passes through high-pass filtering circuit and increasing
The filtering of beneficial amplifying circuit and processing and amplifying, enter back into phonetic speech power amplification chip u1, by phonetic speech power amplification chip u1's
After process, drive the speaker 7 sends audio alert, so can reduce or remove the noise of speaker.
In the present embodiment, this voice driven circuit 6 also includes the 7th resistance r7, one end of the 7th resistance r7 and first resistor
One end of r1 connects, and the other end of the 7th resistance r7 is connected with one end of second resistance r2.7th resistance r7 is current-limiting resistance, uses
Carry out overcurrent protection in the branch road that the colelctor electrode to the first audion q1 is located, referred to improving this switch cabinet status comprehensive further
Show the security performance of instrument.
In the present embodiment, this voice driven circuit 6 also includes the 8th resistance r8, one end of the 8th resistance r8 and second source
Vdd connects, and the other end of the 8th resistance r8 is connected with phonetic speech power amplification chip u1.8th resistance r8 is current-limiting resistance, is used for
Carry out overcurrent protection.In the present embodiment, this voice driven circuit 6 also includes the 9th resistance r9, and one end of the 9th resistance r9 is grounded,
The other end of the 9th resistance r9 is connected with phonetic speech power amplification chip u1.9th resistance r9 is current-limiting resistance, is used for carrying out excessively stream
Protection is so that the security performance of this switch cabinet status comprehensive indicator is guaranteed further.
In the present embodiment, this voice driven circuit 6 also includes the tenth resistance r10, one end of the tenth resistance r10 and the 4th electricity
The positive pole of solution electric capacity c4 connects, and the other end of the tenth resistance r10 is connected with phonetic speech power amplification chip u1.Tenth resistance r10 is
Current-limiting resistance, is used for carrying out overcurrent protection.This voice driven circuit 6 also includes the 11st resistance r11, the 11st resistance r11's
One end is connected with the positive pole of the 4th electrochemical capacitor c4, and the other end of the 11st resistance r11 is connected with phonetic speech power amplification chip u1.
11st resistance r11 is current-limiting resistance, is used for carrying out overcurrent protection.Above-mentioned 8th resistance r8, the 9th resistance r9, the tenth resistance
R10 and the 11st resistance r11 is all that pins different from phonetic speech power amplification chip u1 connect.
In the present embodiment, the first audion q1 is npn audion.Certainly, in actual applications, the first audion q1
Can be pnp audion, but at this moment the circuit structure of this switch cabinet status comprehensive indicator will accordingly change.
In a word, in the present embodiment, when chopper is in "on" position, delivery circuit breaker cart is pushed away from experimental site by mistake
To audio alert can be sent during operating position；When earthed switch is in "on" position, circuit breaker trolley will be delivered from test position by mistake
Put and audio alert when being pushed into operating position, can be sent.When chopper is in "on" position, earthed switch is in "on" position, will by mistake
Delivery circuit breaker trolley when testing position is pushed into operating position, then sends audio alert；When the cabinet major loop of switch cubicle send
When electric, when that is, three-phase energized circuit has signal to issue mcu1, if now someone stops before cabinet, send audio alert.Should
Switch cabinet status comprehensive indicator can be effectively realized prompting and the warning of circuit breaker cart maloperation, thus strengthening switch cubicle behaviour
The safety made.The structure of this this switch cabinet status comprehensive indicator is simple, is easy to make, and installs and debugging is more convenient.Language
Sound drive circuit 6 can reduce or remove the noise of audio frequency apparatus, therefore can solve because be mingled with audio alert signal into
Faint noise and the problem that leads to audio frequency apparatus that loud noise occurs.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of switch cabinet status comprehensive indicator is it is characterised in that inclusion mcu, phototube coupling input circuit, multy-way switching are opened
Pass, human body sensing probe, human body induction module, voice driven circuit, speaker and display screen, when the distance of people and switch cubicle exists
When in set point, the photometric signal of sensing is converted to level by described human body induction module and becomes by described human body sensing probe
Change signal, described level variable signal is sent to described mcu, described light by multi-channel switch by described human body induction module
First switch cabinet status signal outside electric isolution input circuit reception, first switch cabinet status signal is carried out level conversion and obtains
To second switch cabinet status signal, and described second switch cabinet status signal is sent to described by described multi-channel switch
After mcu, described mcu make corresponding judgement, send corresponding audio alert signal, described voice to described voice driven circuit
Drive circuit drives described speaker to send audio alert, and described display screen is connected with described mcu；
Described voice driven circuit include phonetic speech power amplification chip, first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electrochemical capacitor, the 5th electrochemical capacitor, the 6th electricity
Hold and the first audion, the base stage of described first audion pass through described 6th electric capacity respectively with one end of described 4th resistance and
One end of 5th resistance connects, and the emitter stage of described first audion passes through described 6th resistance eutral grounding, described 4th resistance
The other end is grounded, and the other end of described 5th resistance is connected with described mcu, the colelctor electrode of described first audion respectively with described
One end of one end of first electric capacity and 3rd resistor connects, and one end of the other end of described 3rd resistor and the second electric capacity is all connected with
First power supply, the other end ground connection of described second electric capacity, the other end of described first electric capacity is with described by described first resistor
Be connected with one end of described second resistance and a gain pin of phonetic speech power amplification chip respectively, described second resistance another
End is connected with another gain pin of described phonetic speech power amplification chip, and described 3rd electric capacity and the 5th electrochemical capacitor are in parallel, its
One end in parallel connects second source and phonetic speech power amplification chip respectively, and the other end in parallel amplifies core with described phonetic speech power
Piece connects and is grounded, and the positive pole of described 4th electrochemical capacitor is connected with described phonetic speech power amplification chip, described 4th electrolysis electricity
The minus earth holding.
2. switch cabinet status comprehensive indicator according to claim 1 is it is characterised in that described voice driven circuit also wraps
Include the 7th resistance, one end of described 7th resistance is connected with one end of described first resistor, the other end of described 7th resistance with
One end of described second resistance connects.
3. switch cabinet status comprehensive indicator according to claim 2 is it is characterised in that described voice driven circuit also wraps
Include the 8th resistance, one end of described 8th resistance is connected with described second source, the other end of described 8th resistance and institute's predicate
Sound power amplifier chip connects.
4. the switch cabinet status comprehensive indicator according to claims 1 to 3 any one is it is characterised in that described voice
Drive circuit also includes the 9th resistance, one end ground connection, the other end of described 9th resistance and the described voice of described 9th resistance
Power amplifier chip connects.
5. switch cabinet status comprehensive indicator according to claim 4 is it is characterised in that described voice driven circuit also wraps
Include the tenth resistance, one end of described tenth resistance is connected with the positive pole of described 4th electrochemical capacitor, described tenth resistance another
End is connected with described phonetic speech power amplification chip.
6. switch cabinet status comprehensive indicator according to claim 5 is it is characterised in that described voice driven circuit also wraps
Include the 11st resistance, one end of described 11st resistance is connected with the positive pole of described 4th electrochemical capacitor, described 11st resistance
The other end be connected with described phonetic speech power amplification chip.
7. switch cabinet status comprehensive indicator according to claim 6 is it is characterised in that described first switch cabinet state is believed
Number include electrification in high voltage status signals, earthing position signalling, circuit breaker position signal, circuit breaker cart operating position signal and
Circuit breaker cart experimental site signal.
8. switch cabinet status comprehensive indicator according to claim 1 is it is characterised in that described first audion is npn
Type audion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793322.5A CN106356756A (en) | 2016-08-30 | 2016-08-30 | Comprehensive switch cabinet state indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793322.5A CN106356756A (en) | 2016-08-30 | 2016-08-30 | Comprehensive switch cabinet state indicator |
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| CN106356756A true CN106356756A (en) | 2017-01-25 |
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| CN201610793322.5A Pending CN106356756A (en) | 2016-08-30 | 2016-08-30 | Comprehensive switch cabinet state indicator |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122807Y (en) * | 2007-12-07 | 2008-09-24 | 安徽鑫龙电器股份有限公司 | Switch cabinet status indicator |
| KR101167979B1 (en) * | 2012-01-30 | 2012-07-23 | 동영전기 주식회사 | A safe switch-gear built-in an automatic compulsory power cut work induction function |
| CN203563186U (en) * | 2013-10-08 | 2014-04-23 | 美的集团股份有限公司 | Noise reduction circuit and voice audio driving circuit provided with same |
-
2016
- 2016-08-30 CN CN201610793322.5A patent/CN106356756A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122807Y (en) * | 2007-12-07 | 2008-09-24 | 安徽鑫龙电器股份有限公司 | Switch cabinet status indicator |
| KR101167979B1 (en) * | 2012-01-30 | 2012-07-23 | 동영전기 주식회사 | A safe switch-gear built-in an automatic compulsory power cut work induction function |
| CN203563186U (en) * | 2013-10-08 | 2014-04-23 | 美的集团股份有限公司 | Noise reduction circuit and voice audio driving circuit provided with same |
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Application publication date: 20170125 |