CN205490826U - Internet protocol camera safety cover - Google Patents
Internet protocol camera safety cover Download PDFInfo
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- CN205490826U CN205490826U CN201620019700.XU CN201620019700U CN205490826U CN 205490826 U CN205490826 U CN 205490826U CN 201620019700 U CN201620019700 U CN 201620019700U CN 205490826 U CN205490826 U CN 205490826U
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Abstract
The utility model discloses an internet protocol camera safety cover, include: shield ontology, its include diapire, lateral wall and by the atrium that diapire and lateral wall were injectd, the net twine port, it sets up on shield ontology's the diapire or lateral wall, POE power module, it sets up in the atrium for to follow the POE network signal decomposition that the net twine port drawed is camera data signal and DC power supply signal, control module, it sets up in the atrium, be used for with DC power supply signal conversion is camera power supply signal. The utility model provides an internal integration has POE power module's internet protocol camera safety cover, and it can supply power to safety cover integrated functional device and built -in internet protocol camera only to need the externally to insert all the way standard net twine.
Description
Technical field
This utility model relates to web camera technical field, specifically, relates to a kind of web camera protection
Cover.
Background technology
Web camera is when outdoor application, it is necessary to installs protective cover and could normally work as accessory.Mesh
Front common protective cover is generally fitted provided with infrared lamp and fan, and what function was complicated also can be equipped with heater and windscreen wiper
Device.On the one hand, protective cover can be that video camera provides waterproofing and airtight protection, on the other hand can also provide night
The infrared light filling of pattern and fan auxiliary heat dissipation.In addition to above-mentioned functions, more complicated protective cover may be provided for low
Temperature heating compensation and windscreen wiper safeguard function.
These operational modules of infrared lamp, fan, windscreen wiper and heater need power supply, are simultaneously located in protective cover
The video camera in portion is also required to power supply；In addition to the network signal that transmission web camera generates, also must be equipped with
Netting twine.Therefore, the commonly used DC12V/AC24V of traditional protective cover adds the wire laying mode of netting twine, namely
Say two lines to be had inside entrance guard shield, as shown in Figure 1.This means in the field using protective cover product
Closing, outside must be equipped with DC12V/AC24V power supply.
This traditional design needs to increase external power supply cost, and the power quality good and the bad that different vendor produces is not
Together, risk is often increased.The most important thing is to be not easy to engineering site construction.Because current web camera
Mostly supporting that POE powers, individual camera only needs to arrange a netting twine and gets final product work.After increasing protective cover,
Must access a road power line again is that the device on protective cover is powered, and the POE of video camera powers and also loses meaning,
The simplest wiring is made again to complicate.
Therefore, a kind of network shooting utilizing a road straight through cable can realize power supply and network signal transmission is needed badly
Machine protective cover.
Utility model content
One of the purpose of this utility model is to provide a kind of network shooting machine protective cover, it is possible to utilize a road sign accurate
Netting twine can realize power supply and network signal transmits.
This utility model provides a kind of network shooting machine protective cover, including:
Protective cover body, it includes diapire, sidewall and the atrium limited by described diapire and sidewall；
On netting twine port, its diapire being arranged on described protective cover body or sidewall；
POE supply module, it is arranged in described atrium, for the POE net that will extract from netting twine port
Network signal decomposition is camera data signal and DC power signal；
Control module, it is arranged in described atrium, for described DC power signal is converted to video camera
Power supply signal.
In one embodiment, the infrared module being arranged in described atrium is also included；
Described control module is additionally operable to be converted to described DC power signal infrared module power supply signal, and will set
The control instruction putting the generation of the video camera in described atrium is converted to infrared control instruction, described red to control
Outer mold piece compensates infrared light.
In one embodiment, the radiating module being arranged in described atrium is also included；
Described control module is additionally operable to described DC power signal is converted to radiating module power supply signal, and produces
Radiating control instruction controls described radiating module and dispels the heat.
In one embodiment, the heating module being arranged in described atrium is also included；
Described control module is additionally operable to described DC power signal is converted to heating module power supply signal, and produces
Computer heating control instruction controls described heating module and heats.
In one embodiment, also include that the windscreen wiper being arranged in described atrium drives module；
Described control module is additionally operable to described DC power signal is converted to windscreen wiper power supply signal, and produces windscreen wiper
Control instruction controls described windscreen wiper and drives module to be operated.
In one embodiment, described POE supply module includes:
Network voltage transformation unit, is decomposed into camera data signal and AC signal by POE network signal；
Rectification unit, carries out rectification output M signal to described AC signal；
Detector unit, produces feedback signal according to described M signal, by described feedback signal by network transformation
Unit transmits to PSE device, so that detector unit is shaken hands with PSE device；
DC conversion unit, is converted to DC power signal by described M signal after having shaken hands.
In one embodiment, described DC conversion unit includes:
On-off circuit, generates switching signal based on M signal；
Flyback transformer, is converted to described DC source letter under the effect of switching signal by described M signal
Number.
In one embodiment, described flyback transformer includes armature winding, secondary windings and is arranged at primary
The auxiliary winding of winding side；
Described on-off circuit includes pwm chip, switching tube, opto-coupled feedback circuit；
Wherein, inside described pwm chip, include PWM logic element, adjust for output pulse width
Signal processed drives the grid of switching tube, makes the drain electrode of switching tube produce switching signal, and armature winding is according to described
Switching signal produces pulse voltage, thus excites the pulse voltage that amplitude reduces on the secondary winding, and then to width
The pulse voltage that value reduces is filtered exporting described direct current signal；
One end of opto-coupled feedback circuit connects the outfan of secondary windings, and the other end connects pwm chip
Output feedback pin, pwm chip according to opto-coupled feedback electric circuit inspection to output voltage adjust pulse
The dutycycle of bandwidth modulation signals.
In one embodiment, described on-off circuit also includes current detection circuit, described current detection circuit bag
Include the first detection resistance being connected in series and the second detection resistance, wherein, the first detection resistance and the second detection electricity
The end that connects of resistance is connected with the source electrode of switching tube, and the other end of the first detection resistance connects pwm chip
Current sense pin, the other end ground connection of the second detection resistance；
Pwm chip is according to the voltage cut-out pipe on or off of detection pin input, to realize
Overcurrent protection.
In one embodiment, described feedback signal includes detecting feedback signal and power classification feedback signal, inspection
The process that survey unit and PSE device carry out shaking hands includes detection-phase and power classification stage；
Wherein, in detection-phase, the detection electric current that described M signal is produced by detector unit is anti-as detection
Feedback signal, POE supply module is identified as conforming to IEEE802.3at based on described detection feedback signal by PSE device
The legitimate device of agreement；
In the power classification stage, the characteristic current that described M signal is produced by detector unit is as power classification
Feedback signal, PSE device power grade based on described power classification feedback signal identification POE supply module.
This utility model provides a kind of network shooting machine protective cover being internally integrated POE supply module, to not having
The common protective cover of standby POE function of supplying power expands POE function of supplying power, simplifies the externally fed line of protective cover
Road.Protective cover only need to access a road straight through cable from outside can be to the integrated functional device of protective cover and built-in
Web camera is powered.
This utility model is at the external powerful metal-oxide-semiconductor of pwm chip, and arranges output feedback circuit,
Can reliablely and stablely realize high-power output, the various functional devices and the built-in camera that meet protective cover are many
The power demands that number function works simultaneously.
Other features and advantages of the utility model will illustrate in the following description, and, partly from froming the perspective of
Bright book becomes apparent, or understands by implementing this utility model.The purpose of this utility model and its
He can be realized by structure specifically noted in description, claims and accompanying drawing and be obtained advantage
?.
Accompanying drawing explanation
Accompanying drawing is used for providing being further appreciated by of the present utility model, and constitutes a part for description, with this
The embodiment of utility model is provided commonly for explaining this utility model, is not intended that restriction of the present utility model.?
In accompanying drawing:
Fig. 1 is the operation principle schematic diagram of network shooting machine protective cover in prior art；
Fig. 2 is the operation principle schematic diagram of the network shooting machine protective cover of the embodiment of the present application one；
Fig. 3 is the structural representation of the POE supply module of the embodiment of the present application one；
Fig. 4 is the electrical block diagram of the DC conversion unit of the embodiment of the present application two.
Detailed description of the invention
Embodiment of the present utility model is described in detail, whereby to this practicality below with reference to drawings and Examples
Novel how application technology means solve technical problem, and the process that realizes reaching relevant art effect can be fully
Understand and implement according to this.Each feature in the embodiment of the present application and embodiment, can on the premise of not colliding
To be combined with each other, the technical scheme formed is all within protection domain of the present utility model.
The application provides a kind of network shooting machine protective cover being internally integrated POE supply module, to not possessing
The common protective cover of POE function of supplying power expands POE function of supplying power, simplifies the externally fed circuit of protective cover.
Protective cover only need to access a road straight through cable from outside can be to the integrated functional device of protective cover and built-in net
Network video camera is powered.It finds particular application to install out of doors, it is possible to omit power-supply wiring and significantly subtract
Few installation workload.The protective cover that embodiments herein provides goes for gun shaped web camera.
Embodiment one
Fig. 2 is the principle schematic diagram of the network shooting machine protective cover of the present embodiment.As in figure 2 it is shown, this protection
Cover mainly includes protective cover body 210, the netting twine port 220, Yi Jishe being arranged on protective cover body 210
Put the POE supply module 230 in protective cover body 210 and control module 240.Wherein, POE powers mould
Block 230 is for being decomposed into camera data signal and direct current by the POE network signal extracted from netting twine port 220
Power supply signal, control module 240 is for being converted to video camera power supply signal by described DC power signal.So,
Control module 240 is that the video camera 250 being arranged in protective cover body 210 is powered, the mould and POE powers
Block 230 forwards data signal for video camera 250.
Control module 240 connects video camera 250 also by controlling passage, for receiving the various of video camera generation
Control instruction, this is described below.
Additionally, this protective cover also includes the infrared module 260 being arranged in protective cover body 210, at night
Infrared illumination is provided in the environment of the brightness such as late or cloudy is more weak.Infrared module 260 can include infrared lamp
Bubble and driver circuit plate.DC power signal is converted to infrared module power supply signal by control module 240, to drive
Dynamic infrared module 260 is operated.Video camera 250 detects external environment condition according to the monitoring image collected
Brightness flop, if brightness is too low, then video camera 250 produces control instruction to compensate infrared light.Control module 240
The control instruction that video camera 250 produces is converted to infrared control instruct and control infrared module 260 and shine
Bright.
This protective cover also includes the radiating module 270 being arranged in protective cover body 210, it is provided that heat sinking function.
Radiating module 270 can be such as fan.DC power signal is converted to radiating module and supplies by control module 240
The signal of telecommunication, to drive radiating module 270 to be operated.Owing to POE supply module 230 power consumption is relatively big, protection
The heat of cover body 210 inner accumulated is more, the temperature in the real-time monitoring and protecting cover body 210 of control module 240.
When monitoring thermo-field thoery, control module 240 produces radiating control instruction and controls radiating module 270 and carry out
Heat radiation.
In a preferred example, this protective cover also includes the heating module being arranged in protective cover body 210
280, for additional heat at low ambient temperatures.Similar with radiating module 270, control module 240 will be straight
Stream power supply signal is converted to heating module power supply signal, to drive heating module 280 to be operated.When monitoring
When temperature is too low, control module 240 produces computer heating control instruction and controls heating module 280 and heat.
In a preferred example, this protective cover also includes that the windscreen wiper being arranged in protective cover body 210 drives
Module 290, is arranged on the windscreen wiper outside protective cover body 210 for driving and starts or stops.Control module
DC power signal is converted to windscreen wiper power supply signal by 240, drives module 290 to power for windscreen wiper.Video camera 250
Readability according to the image information collected is judged to rain and is caused lens blur, produces control instruction and drives
Dynamic windscreen wiper action.The control instruction that video camera 250 produces is converted to windscreen wiper control instruction by control module 240
Controlling windscreen wiper drives module 290 to be operated.Or, control module 240 is produced after automatically detecting rainy weather
Raw windscreen wiper control instruction controls windscreen wiper and drives module 290 to be operated.
Fig. 3 is the structured flowchart of POE supply module 230.As it is shown on figure 3, POE supply module 230 is main
Network voltage transformation unit 221 to be included, rectification unit 222, detector unit 223 and DC conversion unit 224.
Network voltage transformation unit 221 has input 221a, for receiving the POE extracted from netting twine port 220
Network signal.Network voltage transformation unit 221 is additionally provided with data output end 221b and power output end 221c.Net
POE network signal is decomposed into data signal and AC signal by network voltage transformation unit 221, and at data output end
The upper outputting data signals of 221b, output AC signal on power output end 221c.
The input of rectification unit 222 is connected with the power output end 221c of network voltage transformation unit 221, for right
AC signal carries out rectification and processes output M signal.
Detector unit 223 is connected with the outfan of rectification unit 222, and detector unit 223 is produced according to M signal
Raw feedback signal, by the feedback signal feeder ear equipment (Power by network voltage transformation unit transmission to upstream
Sourcing Equipment, is called for short PSE), shake hands with PSE device.Wherein, feedback signal includes inspection
Survey feedback signal and power classification feedback signal.
Specifically, the process that detector unit and PSE device carry out shaking hands includes detection-phase and power classification rank
Section.First, in detection-phase, detector unit 223 identifies the less level signal that PSE device exports,
Under the effect of this level signal, featured resistance based on self produces detection electric current, using this detection electric current as inspection
Survey feedback signal, so that POE supply module 230 is identified as conforming to by PSE device based on detection feedback signal
The legal receiving end equipment (Powered Device is called for short PD) of IEEE802.3at agreement.Subsequently, exist
In the power classification stage, detector unit 223 produces feature under the hierarchical detection level effect that PSE device exports
Electric current, knows this feature electric current based on power classification feedback signal as power classification feedback signal, PSE device
The power grade of other POE supply module.After detection and classification complete, POE supply module 230 sets with PSE
For completing to shake hands.In power supply process subsequently, PSE device provides the intermediate dc electricity of 48V to PD equipment
Source signal.
As it is shown on figure 3, DC conversion unit 224 has input 224a and outfan 224b, direct current is changed
The input 224a of unit is connected with the outfan of rectification unit 222.After detector unit 223 completes to shake hands
Power supply process in, the 48V intermediate dc power supply signal that rectification unit 222 is exported by DC conversion unit 224
Be converted to the 12V DC power signal that power receiving equipment is suitable for, and on outfan 224b, export this DC source
Signal.
Control module 240 connects the outfan 224b of DC conversion unit 224, DC source decomposition obtained
Signal is supplied to video camera 250, infrared module 260, radiating module 270, heating module 280 and windscreen wiper and drives
Dynamic model block 290.
Video camera 250 connects the outfan 221b of network voltage transformation unit 221 to obtain camera data signal.
In a preferred example, protective cover body 210 includes diapire, sidewall and by described diapire and side
The atrium that wall is limited, netting twine port 220 is arranged on diapire or the sidewall of described protective cover body.Control
Molding block 240, video camera 250, infrared module 260, radiating module 270, heating module 280 and windscreen wiper
Module 290 is driven to be arranged in atrium.
So, protective cover entirety only needs a straight through cable connected with network cable port 220, installs and is simplicity.PSE
Equipment, is powered POE network signal input protective cover mould by POE inside protective cover by straight through cable
POE network signal is decomposed into camera data signal and DC power signal by block, and protective cover no longer draws from outside
Enter power line.
Protective cover product typically requires and arranges 4 or 6 Infrared High-Power lamps, in addition it is also necessary to power for fan,
Video camera to be is powered, and the power of whole system is bigger.POE power supply module mentioned by the present embodiment
Being all based on the PD circuit of AT agreement, maximum can support 25.5W power, can meet the most
Number demand.
Embodiment two
The particular circuit configurations of DC conversion unit 224 is described below according to Fig. 4.DC conversion unit includes instead
Swash formula transformator 410 and on-off circuit 420.The M signal that on-off circuit 420 produces based on rectification unit is raw
Becoming switching signal, intermediate dc power supply signal is converted under the effect of switching signal by flyback transformer 410
Direct current signal.
The DC conversion unit 224 provided in the present embodiment can realize the load of peak power 25W, is especially suitable for merit
The POE product that rate is bigger uses.
As shown in Figure 4, flyback transformer 410 includes armature winding, secondary windings and is placed in armature winding one
The auxiliary winding of side.
The input (No. 1 end) of armature winding is configured to the input Vi of DC conversion unit 224, is connected to
Rectification unit, receives the 48V intermediate dc signal that rectification unit produces.The outfan (No. 3 ends) of armature winding
Connecting valve circuit 420, controls the voltage on armature winding according to switching signal, when this switching signal is closed
Time, a flyback voltage reflexes to secondary windings and auxiliary winding from armature winding.
One end (No. 10 ends) of secondary windings connects the anode of output diode DP1, output diode DP1
Negative electrode be connected to the output end vo of DC conversion unit 224.Connect the other end (No. 9 ends) of secondary windings even
Connecing one end of output capacitance CP4, the other end of output capacitance CP4 connects the negative electrode of output diode DP1.
Output capacitance CP4 is for being filtered the 12V DC voltage of output.
One end (No. 4 ends) of auxiliary winding connects datum HGND, and the other end (No. 5 ends) connects to be opened
Close circuit 420, provide supply voltage VCC to on-off circuit PWM chip.
In the present embodiment, on-off circuit 420 mainly includes pwm chip, switching tube and opto-coupled feedback
Circuit.In the diagram, the model of pwm chip is TL2845BDR-8, and the preferred model of switching tube is
The metal-oxide-semiconductor of FDS86242, photo-coupler is preferably LTV-357T-A.Due to POE in embodiments herein
Output power is bigger, it is desirable to circuit has higher carrying load ability, uses PWM chip to add external MOS
Circuit framework can provide bigger current output.
Wherein, pwm chip is internally integrated PWM logic element, PWM logic element output pulse width
Degree modulated signal drives the grid of switching transistor, and the drain electrode of switching transistor produces switching signal, is used for controlling
Armature winding processed produces pulse voltage, excites the pulse voltage that amplitude reduces on the secondary winding, by filter circuit
The low-voltage DC source signal that output power receiving equipment is suitable for.
As shown in Figure 4, No. 7 foot VCC of TL2845BDR-8 chip are power supply input pins, connection transformer
The auxiliary winding of T1, No. 5 feet be output pin (GND) ground connection (herein and flyback transformer secondary around
The ground isolation of group).No. 6 feet of TL2845BDR-8 chip connect the grid of metal-oxide-semiconductor, the low and high level of No. 6 feet
The drain electrode of metal-oxide-semiconductor produces switching signal.When metal-oxide-semiconductor turns on, armature winding there is electric current flow through,
When metal-oxide-semiconductor ends, the current interruptions of armature winding, thus control armature winding break-make.PWM logic basis
The pulse width modulating signal of part output determines the ON time length of metal-oxide-semiconductor.Armature winding produces pulse electricity
Pressure, can excite secondary windings to produce the pulse voltage that amplitude reduces, and this pulse voltage is through by output capacitance CP4
After being filtered with the filter circuit of diode DP1 composition, the low pressure 12V direct current that output power receiving equipment is suitable for
Power supply signal.
Additionally, on-off circuit 420 also includes current detection circuit.In the diagram, current detection circuit includes string
The end that connects of resistance R2 and R3, resistance R2 and R3 that connection connects is connected with the source electrode of metal-oxide-semiconductor, resistance
The other end of R2 connects TL2845BDR-8 chip current detection pin (No. 3 feet), the other end of resistance R3
Ground connection.When by the electric current of MOS more than certain threshold value, TL2845BDR-8 chip directly drags down MOS
The grid level of pipe, makes metal-oxide-semiconductor end rapidly, thus avoids stream to burn out transformator or metal-oxide-semiconductor.
No. 4 feet of TL2845BDR-8 chip are for arranging the switching frequency of PWM, and the parameter of R1, CV3 determines
The size of switching frequency, switching frequency F=1/R1*CV3.The present embodiment arranges according to reality debugging effect and opens
Pass frequency is 150KHZ, can meet actually used demand.
No. 2 feet of TL2845BDR-8 chip are output feedback pin, photo-coupler UV2, adjustable voltage stabilizer
DV1, resistance R4 to R6 form outfan feedback circuit, and output signal is fed back to pwm chip.
Wherein the bleeder circuit of R5, R6 composition is connected to adjustable precision shunt regulator by after the DC12V dividing potential drop of output
DV1, DV1 reconnect the emission side at optocoupler UV2.When output voltage fluctuates, the electricity that DV1 receives
Pressure can produce corresponding fluctuation, has influence on the level of optocoupler UV2 emission side, and the photosensitive side of optocoupler can will receive electricity
Flat fluctuation feeds back to No. 2 feet of TL2845BDR-8 chip, thus realizes the closed loop control of voltage output.
Feedback voltage V ref is compared, root by TL2845BDR-8 chip with internal reference voltage COMP (No. 1 foot)
The dutycycle of pulse width modulating signal is adjusted, to keep time electricity of limit winding output according to the feedback voltage detected
Press constant.
Be can be seen that by above scheme, the present embodiment at the external powerful metal-oxide-semiconductor of pwm chip, and
Output feedback circuit is set, can be reliable and stable realize powerful output, meet the various functions of protective cover
The power demands that most functions of device and built-in camera work simultaneously.
Further, since present case provides output loading relatively big, other peripheral circuit device type selectings are the most fully examined
Consider surplus.Rectifier bridge chip such as POE uses KBP206, and outfan commutation diode uses
SBR6100CTL, is used for meeting powerful output demand.
Technical staff in any this utility model art, without departing from disclosed in the utility model
On the premise of spirit and scope, any amendment and change and can be made in details implement in form, but this
The scope of patent protection of utility model, still must be defined in the range of standard with appending claims.
Claims (10)
1. a network shooting machine protective cover, it is characterised in that including:
Protective cover body, it includes diapire, sidewall and the atrium limited by described diapire and sidewall；
On netting twine port, its diapire being arranged on described protective cover body or sidewall；
POE supply module, it is arranged in described atrium, for the POE net that will extract from netting twine port
Network signal decomposition is camera data signal and DC power signal；
Control module, it is arranged in described atrium, for described DC power signal is converted to video camera
Power supply signal.
2. network shooting machine protective cover as claimed in claim 1, it is characterised in that also include being arranged on institute
State the infrared module in atrium；
Described control module is additionally operable to be converted to described DC power signal infrared module power supply signal, and will set
The control instruction putting the generation of the video camera in described atrium is converted to infrared control instruction, described red to control
Outer mold piece compensates infrared light.
3. network shooting machine protective cover as claimed in claim 1, it is characterised in that also include being arranged on institute
State the radiating module in atrium；
Described control module is additionally operable to described DC power signal is converted to radiating module power supply signal, and produces
Radiating control instruction controls described radiating module and dispels the heat.
4. network shooting machine protective cover as claimed in claim 1, it is characterised in that also include being arranged on institute
State the heating module in atrium；
Described control module is additionally operable to described DC power signal is converted to heating module power supply signal, and produces
Computer heating control instruction controls described heating module and heats.
5. network shooting machine protective cover as claimed in claim 1, it is characterised in that also include being arranged on institute
State the windscreen wiper in atrium and drive module；
Described control module is additionally operable to described DC power signal is converted to windscreen wiper power supply signal, and produces windscreen wiper
Control instruction controls described windscreen wiper and drives module to be operated.
6. the network shooting machine protective cover as according to any one of claim 1-5, it is characterised in that described
POE supply module includes:
Network voltage transformation unit, is decomposed into camera data signal and AC signal by POE network signal；
Rectification unit, carries out rectification output M signal to described AC signal；
Detector unit, produces feedback signal according to described M signal, by described feedback signal by network transformation
Unit transmits to PSE device, so that detector unit is shaken hands with PSE device；
DC conversion unit, is converted to DC power signal by described M signal after having shaken hands.
7. network shooting machine protective cover as claimed in claim 6, it is characterised in that the conversion of described direct current is single
Unit includes:
On-off circuit, generates switching signal based on M signal；
Flyback transformer, is converted to described DC source letter under the effect of switching signal by described M signal
Number.
8. network shooting machine protective cover as claimed in claim 7, it is characterised in that
Described flyback transformer include armature winding, secondary windings and be arranged at the auxiliary of armature winding side around
Group；
Described on-off circuit includes pwm chip, switching tube, opto-coupled feedback circuit；
Wherein, inside described pwm chip, include PWM logic element, adjust for output pulse width
Signal processed drives the grid of switching tube, makes the drain electrode of switching tube produce switching signal, and armature winding is according to described
Switching signal produces pulse voltage, thus excites the pulse voltage that amplitude reduces on the secondary winding, and then to width
The pulse voltage that value reduces is filtered exporting described direct current signal；
One end of opto-coupled feedback circuit connects the outfan of secondary windings, and the other end connects pwm chip
Output feedback pin, pwm chip according to opto-coupled feedback electric circuit inspection to output voltage adjust pulse
The dutycycle of bandwidth modulation signals.
9. network shooting machine protective cover as claimed in claim 7, it is characterised in that
Described on-off circuit also includes that current detection circuit, described current detection circuit include first be connected in series
Detection resistance and the second detection resistance, wherein, the first detection resistance and the connection end of the second detection resistance and switch
The source electrode of pipe connects, and the other end of the first detection resistance connects the current sense pin of pwm chip, the
The other end ground connection of two detection resistance；
Pwm chip is according to the voltage cut-out pipe on or off of detection pin input, to realize
Overcurrent protection.
10. network shooting machine protective cover as claimed in claim 6, it is characterised in that
Described feedback signal includes detecting feedback signal and power classification feedback signal, detector unit and PSE device
The process carrying out shaking hands includes detection-phase and power classification stage；
Wherein, in detection-phase, the detection electric current that described M signal is produced by detector unit is anti-as detection
Feedback signal, POE supply module is identified as conforming to IEEE802.3at based on described detection feedback signal by PSE device
The legitimate device of agreement；
In the power classification stage, the characteristic current that described M signal is produced by detector unit is as power classification
Feedback signal, PSE device power grade based on described power classification feedback signal identification POE supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620019700.XU CN205490826U (en) | 2016-01-11 | 2016-01-11 | Internet protocol camera safety cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620019700.XU CN205490826U (en) | 2016-01-11 | 2016-01-11 | Internet protocol camera safety cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205490826U true CN205490826U (en) | 2016-08-17 |
Family
ID=56666428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620019700.XU Active CN205490826U (en) | 2016-01-11 | 2016-01-11 | Internet protocol camera safety cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205490826U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109739125A (en) * | 2018-12-26 | 2019-05-10 | 南京北路自动化系统有限责任公司 | A kind of intrinsic safety type video camera wiper control device and control method |
-
2016
- 2016-01-11 CN CN201620019700.XU patent/CN205490826U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109739125A (en) * | 2018-12-26 | 2019-05-10 | 南京北路自动化系统有限责任公司 | A kind of intrinsic safety type video camera wiper control device and control method |
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