CN106303342A - A kind of power supply circuits based on supply power coaxially technology - Google Patents

A kind of power supply circuits based on supply power coaxially technology Download PDF

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Publication number
CN106303342A
CN106303342A CN201510248753.9A CN201510248753A CN106303342A CN 106303342 A CN106303342 A CN 106303342A CN 201510248753 A CN201510248753 A CN 201510248753A CN 106303342 A CN106303342 A CN 106303342A
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China
Prior art keywords
circuit
power supply
power
access port
image acquisition
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CN201510248753.9A
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Chinese (zh)
Inventor
叶敏
罗明玲
张思恩
张亮
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Hangzhou Hikvision Digital Technology Co Ltd
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Hangzhou Hikvision Digital Technology Co Ltd
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Priority to CN201510248753.9A priority Critical patent/CN106303342A/en
Publication of CN106303342A publication Critical patent/CN106303342A/en
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Abstract

A kind of power supply circuits based on supply power coaxially technology, including the process circuit of Video processing end, described process circuit includes testing circuit and control circuit;Described testing circuit, for detecting the electric parameter of the access port of described Video processing end;Described control circuit, for according to described electric parameter, controlling the break-make that the power supply of described image acquisition terminal is exported by described access port.Wherein, described electric parameter is magnitude of voltage and/or current value, and described access port is the port of incoming image acquisition terminal.Visible, it is somebody's turn to do power supply circuits based on supply power coaxially technology, the electric parameter of the access port of end is processed by detection analysis video, whether the image acquisition terminal that can identify Video processing end external supports supply power coaxially, and further determine whether to need described image acquisition terminal is powered according to analysis result, safety is high.

Description

A kind of power supply circuits based on supply power coaxially technology
Technical field
The present invention relates to security protection acquisition technology field, particularly relate to a kind of based on supply power coaxially technology Power supply circuits.
Background technology
Supply power coaxially (POC, Power Over Coaxia) is a kind of video based on coaxial cable, coaxial Control, the transmission technology of power supply superposition.In coaxial cable transmitting procedure, both transmitted analog video signal, Coaxial signal transmits again power supply, will analog video, the signal such as coaxial be combined with each other with power supply, A coaxial line transmits.Apply this POC technology to carry out engineering wiring, be possible not only to save considerable Cost, and the engineering time can be shortened, application is quite varied at present.For setting that support POC powers Standby, passing through coaxial line with supply power coaxially circuit such as the POC camera analogue camera of supply power coaxially (support) After connection, meeting one DC source of superposition on coaxial line, the voltage ratio of this DC source is higher, generally Can reach 10V and more than.This voltage is connected on POC camera to meet power reguirements, but If common analogue camera (not supporting POC) is connected on this voltage by client by mistake, will occur general The problem that logical camera burns.
Summary of the invention
It is an object of the invention to provide a kind of power supply circuits based on supply power coaxially technology, it is possible to by detection Whether the electric parameter of the access port of Video processing end, support the image acquisition terminal that Video processing end is external Supply power coaxially is differentiated, and further determines whether to need to be powered image acquisition terminal, safety Property high.
According to the present invention, it is provided that a kind of power supply circuits based on supply power coaxially technology, including Video processing end Process circuit, described process circuit includes testing circuit and control circuit, described testing circuit and control Circuit is electrically connected with;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electricity ginseng Amount is magnitude of voltage and/or current value, and described access port is the port of incoming image acquisition terminal;
Described control circuit, for according to described electric parameter, controls described access port to described image acquisition The break-make of the power supply output of terminal.
Wherein, described control circuit includes onunit and cutting unit;
Described onunit, if belonging to default first electric parameter scope for described electric parameter, then turns on institute State access port the power supply of described image acquisition terminal is exported;
Described cutting unit, if belonging to default second electric parameter scope for described electric parameter, then cuts off institute State access port the power supply of described image acquisition terminal is exported.
Wherein, described control circuit includes onunit and cutting unit;
Described onunit, for the power supply output of described image acquisition terminal being cut off when described access port, And the changing value of described electric parameter is beyond pre-determined stability electric parameter scope, then turn on described access port to described The power supply output of image acquisition terminal;
Described cutting unit, for the power supply output of described image acquisition terminal being turned on when described access port, And the changing value of described electric parameter is beyond pre-determined stability electric parameter scope, then cut off described access port to described The power supply output of image acquisition terminal.
Wherein, described process circuit also include power circuit, video processing circuits, the first isolated location, Supercircuit, switch and partial pressure unit.
Wherein, the signal input part of described testing circuit connects one end of partial pressure unit, external same respectively First access port of axis cable, the first not moved end, one end of the first isolated location, described detection of switch The signal output part of circuit connects the signal input part of described control circuit, and the signal of described control circuit is defeated Going out to hold the moved end of connecting valve, the second of described switch not moved end connects one end of supercircuit, described folded The other end adding circuit connects power circuit, and the other end of described partial pressure unit connects detection input power End, the other end of described first isolated location connects described video processing circuits.
Wherein, described first isolated location is electric capacity C1.
Wherein, described partial pressure unit is resistance R1.
Wherein, the second access port of described external coaxial cable connects image acquisition terminating circuit.
Wherein, described image acquisition terminating circuit include supply power coaxially circuit, video processing circuit, Parasite power supplier, matching unit and the second isolated location.
Wherein, one end of described supply power coaxially circuit connects the second of described external coaxial cable respectively and connects Entrance and one end of matching unit, the other end of described matching unit connects one end of the second isolated location, The other end of described second isolated location connects described video processing circuit, described supply power coaxially circuit The other end connect described parasite power supplier.
Wherein, described matching unit is resistance R2.
Wherein, the resistance value of described resistance R2 is 75 ohm.
Wherein, described second isolated location is electric capacity C2.
Wherein, described image acquisition terminating circuit includes matching unit and video processing circuit.
Wherein, the second access port of coaxial cable external described in one end of described matching unit, described The other end joining unit connects described video processing circuit.
Wherein, described process circuit also includes plug-pull detecting circuit, and the signal of described plug-pull detecting circuit is defeated Entering end and connect the other end of described first isolated location, the signal output part of described plug-pull detecting circuit connects Described control circuit;
Described plug-pull detecting circuit, for detecting the level signal of the access port of Video processing end;When described Level signal switches to DC level signal from exchange level signal or switches to exchange from DC level signal Level signal, then cut off described access port and export the power supply of described image acquisition terminal.
The present invention provides a kind of power supply circuits based on supply power coaxially technology, including the process of Video processing end Circuit, described process circuit includes testing circuit and control circuit;Described testing circuit, is used for detecting institute State the electric parameter of the access port of Video processing end;Described control circuit, for according to described electric parameter, control Make the break-make that the power supply of described image acquisition terminal is exported by described access port.Wherein, described electric parameter is Magnitude of voltage and/or current value, described access port is the port of incoming image acquisition terminal.Visible, should be based on The power supply circuits of supply power coaxially technology, process the electric parameter of the access port of end by detection analysis video, Whether the image acquisition terminal that can identify Video processing end external supports supply power coaxially, and according to analysis Result further determines whether to need to be powered described image acquisition terminal, and safety is high.
Accompanying drawing explanation
Fig. 1 is the structure of the power supply circuits based on supply power coaxially technology according to first embodiment of the invention Block diagram;
Fig. 2 is the structure of the power supply circuits based on supply power coaxially technology according to second embodiment of the invention Block diagram;
Fig. 3 is the structure of the power supply circuits based on supply power coaxially technology according to third embodiment of the invention Block diagram;
Fig. 4 is the structure of the power supply circuits based on supply power coaxially technology according to four embodiment of the invention Block diagram;
Fig. 5 is the structure of the power supply circuits based on supply power coaxially technology according to fifth embodiment of the invention Block diagram;
Fig. 6 is the structure of the power supply circuits based on supply power coaxially technology according to sixth embodiment of the invention Block diagram;
Fig. 7 is the structure of the power supply circuits based on supply power coaxially technology according to seventh embodiment of the invention Block diagram;
Fig. 8 is the structure of the power supply circuits based on supply power coaxially technology according to eighth embodiment of the invention Block diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention of greater clarity, below in conjunction with being embodied as Mode referring to the drawings, the present invention is described in more detail.It should be understood that these describe simply example Property, and it is not intended to limit the scope of the present invention.Additionally, in the following description, eliminate known knot Structure and the description of technology, to avoid unnecessarily obscuring idea of the invention.
It should be understood that hereinafter, supply power coaxially (POC, Power Over Coaxia) is a kind of base In the video of coaxial line, coaxial control, the technology of power supply superposition.Analogue camera (Analog camera) Be output signal be the camera of analogue signal.ADC (Analog-to-Digital Converte) be mould/ Number converter or analog/digital converter.POC camera is the analogue camera supporting supply power coaxially.Non-POC Camera is the common simulation camera not supporting supply power coaxially.Impedance (Impedance) is electrical impedance, be with Resistance value is real part and reactance value is the plural number of imaginary part, and unit is ohm.
Fig. 1 is the structure of the power supply circuits based on supply power coaxially technology according to first embodiment of the invention Block diagram.
It is somebody's turn to do power supply circuits based on supply power coaxially technology, including the process circuit of Video processing end, described place Reason circuit includes that testing circuit and control circuit, described testing circuit and control circuit are electrically connected with;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electricity ginseng Amount is magnitude of voltage and/or current value, and described access port is the port of incoming image acquisition terminal;
Described control circuit, for according to described electric parameter, controls described access port to described image acquisition The break-make of the power supply output of terminal.
Electrical quantity refers to the power consumption parameter data of electrical equipment.During detection magnitude of voltage, voltage can be selected to pass Sensor, during detection current value, can select current sensor, or directly select voltage-current sensor, Both current value can be detected and magnitude of voltage can also be detected.
Current sensor is a kind of detection device, can experience the information of tested electric current, and can be by detection sense The information being subject to, is for conversion into the signal of telecommunication or the shape needed for other meeting certain standard needs according to certain rules The information output of formula, to meet the transmission of information, to process, store, show, record and the requirement such as control. Current sensor is different according to measuring principle, can be divided mainly into diverter, electromagnetic current transducer and electricity Type current transformer.
Voltage sensor is a kind of detection device, can experience the information of tested voltage, and can be by detection sense The information being subject to, is for conversion into the signal of telecommunication or the shape needed for other meeting certain standard needs according to certain rules The information output of formula, to meet the transmission of information, to process, store, show, record and the requirement such as control. Voltage sensor is broadly divided into direct current voltage sensor and AC voltage sensor two kinds, and alternating voltage senses Device be one tested alternating current (alternating voltage) can be converted into by linear scale output DC voltage or The instrument of DC current.Direct current voltage sensor is that tested DC voltage can be converted into by linear ratio by one Example output DC voltage or the instrument of DC current.
Described access port is the interface accessing coaxial line.Described coaxial line is for connecting the video of supply power coaxially Processing end and image acquisition terminal, the interface of coaxial line is preferably bnc interface.
The power supply circuits based on supply power coaxially technology of first embodiment of the invention, by detecting and analyzing The electric parameter of the access port of Video processing end, can identify the image acquisition terminal that Video processing end is external Whether support supply power coaxially, and further determine whether to need to described image acquisition eventually according to analysis result End is powered, and safety is high.
Fig. 2 is the structure of the power supply circuits based on supply power coaxially technology according to second embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of second embodiment of the invention, add conducting The onunit that the power supply of described image acquisition terminal is exported by described access port and the described access port pair of cut-out The cutting unit of the power supply output of described image acquisition terminal.
Preferably, second embodiment of the invention on the basis of first embodiment of the invention, described control Circuit processed includes onunit and cutting unit;
Described onunit, if belonging to default first electric parameter scope for described electric parameter, then turns on institute State access port the power supply of described image acquisition terminal is exported;
Described cutting unit, if belonging to default second electric parameter scope for described electric parameter, then cuts off institute State access port the power supply of described image acquisition terminal is exported.
Preferably, external described image acquisition terminal is analogue camera, by whether supporting that POC supplies Electricity makes a distinction, and analogue camera can be divided into POC camera and two kinds of non-POC camera.Described default first The default electric parameter scope of electric parameter scope correspondence POC camera, described default second electric parameter scope is corresponding The default electric parameter scope of non-POC camera.
Aforesaid way is that the absolute value to described electric parameter is analyzed, by analyzing the absolute value of electric parameter, Can help to identify whether external described image acquisition terminal supports that POC powers.Electric parameter is being carried out After detection, by analysis, described access port can complete the identification to external image acquisition terminal the most really Fixed the need of supplying power for outside.
Preferably, second embodiment of the invention on the basis of first embodiment of the invention, described control Circuit processed includes onunit and cutting unit;
Described onunit, for the power supply output of described image acquisition terminal being cut off when described access port, And the changing value of described electric parameter is beyond pre-determined stability electric parameter scope, then turn on described access port to described The power supply output of image acquisition terminal;
Described cutting unit, for the power supply output of described image acquisition terminal being turned on when described access port, And the changing value of described electric parameter is beyond pre-determined stability electric parameter scope, then cut off described access port to described The power supply output of image acquisition terminal.
Aforesaid way is that the relative difference to described electric parameter is analyzed, by analyzing the phase of electric parameter To difference value, can help to identify whether external image acquisition terminal supports that POC powers.Pre-determined stability Electric parameter scope can be configured according to the data of actual measurement, and the data of actual measurement can be adopted according to external image The model difference difference of collection terminal.
The power supply circuits based on supply power coaxially technology of second embodiment of the invention, can be by detection The difference of the electric parameter that POC camera is corresponding with non-POC camera completes the resolution of analogue camera kind, enters And automatically determine a need for supplying power for outside.
Fig. 3 is the structure of the power supply circuits based on supply power coaxially technology according to third embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of third embodiment of the invention, to described process The particular circuit configurations of circuit is illustrated.
Third embodiment of the invention is on the basis of first embodiment of the invention, and described process circuit is also Including power circuit, video processing circuits, the first isolated location, supercircuit, switch and partial pressure unit.
Wherein, the signal input part of described testing circuit connects one end of partial pressure unit, external same respectively First access port of axis cable, the first not moved end, one end of the first isolated location, described detection of switch The signal output part of circuit connects the signal input part of described control circuit, and the signal of described control circuit is defeated Going out to hold the moved end of connecting valve, the second of described switch not moved end connects one end of supercircuit, described folded The other end adding circuit connects power circuit, and the other end of described partial pressure unit connects detection input power End, the other end of described first isolated location connects described video processing circuits.
The power supply circuits based on supply power coaxially technology of third embodiment of the invention, are automatic detections Circuit, can automatically identify external analogue camera and judge whether to carry out external analogue camera Power supply.
Fig. 4 is the structure of the power supply circuits based on supply power coaxially technology according to four embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of four embodiment of the invention, to described process The particular circuit configurations of circuit is illustrated.
Four embodiment of the invention is on the basis of third embodiment of the invention, and described first isolation is single Unit is electric capacity C1, and described partial pressure unit is resistance R1.
Preferably, the signal input part of described testing circuit connects one end of resistance R1, external same respectively First access port of axis cable, first not moved end, one end of electric capacity C1 of switch, described testing circuit Signal output part connects the signal input part of described control circuit, and the signal output part of described control circuit is even Connecing the moved end of switch, the second of described switch not moved end connects one end of supercircuit, described supercircuit The other end connect power circuit, the other end of described resistance R1 connects detection input supply terminal, described The other end of electric capacity C1 connects described video processing circuits.
Process circuit and be capable of power supply and Video processing, it can be had by functional module segmentation: power supply Circuit, powers for POC;Supercircuit, for being separated power supply with video signal;Switch, uses In realize by control circuit judge the need of supplying power for outside;Testing circuit, for detecting access port By the size of electric parameter, electric parameter, determines whether external analogue camera supports that POC powers.VCC, i.e. Detection is with input voltage value (corresponding detection input supply terminal), for detecting whether support the power supply of POC, Generally low-voltage;R1, i.e. detection divider resistance, for detecting the divider resistance of use;C1, uses In isolated DC power supply, and video signal is inputted to video processing circuits.
Preferably, the video letter of the image acquisition terminal of described magnitude of voltage=external for detection input voltage value * Number process circuit equivalent resistance/(described equivalent resistance+detection divider resistance value).
The power supply circuits based on supply power coaxially technology of four embodiment of the invention, are automatic detections Circuit, can automatically identify external analogue camera and judge whether to carry out external analogue camera Power supply.And the electronic devices and components selected are simply, improve the compactedness of whole power supply circuits, and reduce The cost of power supply circuits.
Fig. 5 is the structure of the power supply circuits based on supply power coaxially technology according to fifth embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of fifth embodiment of the invention, to outside figure As the particular circuit configurations of acquisition terminal circuit is illustrated.
Fifth embodiment of the invention is on the basis of four embodiment of the invention, described external coaxial Second access port of cable connects image acquisition terminating circuit.
External image acquisition terminal is analogue camera, makes a distinction by whether supporting that POC powers, Analogue camera can be divided into POC camera and two kinds of non-POC camera.It it is below the image of corresponding POC camera The concrete structure of acquisition terminal circuit.
Wherein, described image acquisition terminating circuit include supply power coaxially circuit, video processing circuit, Parasite power supplier, matching unit and the second isolated location.
Preferably, one end of described supply power coaxially circuit connects the second of described external coaxial cable respectively Access port and one end of matching unit, the other end of described matching unit connects one end of the second isolated location, The other end of described second isolated location connects described video processing circuit, described supply power coaxially circuit The other end connect described parasite power supplier.
The power supply circuits based on supply power coaxially technology of fifth embodiment of the invention, are automatic detections And the smart circuit of power supply is provided, can automatically identify analogue camera and judge whether can be to analogue camera It is powered, powers according to judged result on or off.
Fig. 6 is the structure of the power supply circuits based on supply power coaxially technology according to sixth embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of sixth embodiment of the invention, to outside figure As the particular circuit configurations of acquisition terminal circuit is illustrated.
Sixth embodiment of the invention is on the basis of fifth embodiment of the invention, and described matching unit is Resistance R2.The resistance value of described resistance R2 is 75 ohm.Described second isolated location is electric capacity C2.
Wherein, one end of described supply power coaxially circuit connects the second of described external coaxial cable respectively and connects Entrance and one end of resistance R2, the other end of described resistance R2 connects one end of electric capacity C2, described electric capacity The other end of C2 connects described video processing circuit, and the other end of described supply power coaxially circuit connects institute State parasite power supplier.
POC camera can support the analogue camera of supply power coaxially, can be subdivided into by functional module: Parasite power supplier, for obtaining electric current from supply power coaxially circuit and being powered POC camera;Supply power coaxially Circuit, for keeping high resistant, supply power coaxially electricity to video signal while power delivery to parasite power supplier Road can be equivalent to a resistance (resistance is bigger) before power supply;R2, C2 be build-out resistor with every straight electricity Hold.R3 is the equivalent resistance of video processing circuit, the least.
After supply power coaxially video processing circuits powers on, switch is opened by control circuit, supply power coaxially video Processing circuit the most not supplying power for outside, electric capacity C1, C2 show as high impedance to DC level.Because of coaxial line On resistance less, for ohm level, negligible.So time testing circuit input voltage V1 be: V1=VCCxR4/ (R4+R1).
The power supply circuits based on supply power coaxially technology of sixth embodiment of the invention, are automatic detections And the smart circuit of power supply is provided, can automatically identify analogue camera and judge whether can be to analogue camera It is powered, powers according to judged result on or off.And the electronic devices and components selected are simply, improve The compactedness of whole power supply circuits, and reduce the cost of power supply circuits.
Fig. 7 is the structure of the power supply circuits based on supply power coaxially technology according to seventh embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of seventh embodiment of the invention, to outside figure As the particular circuit configurations of acquisition terminal circuit is illustrated.
Seventh embodiment of the invention is on the basis of four embodiment of the invention, described external coaxial Second access port of cable connects image acquisition terminating circuit.
External image acquisition terminal is analogue camera, makes a distinction by whether supporting that POC powers, Analogue camera can be divided into POC camera and two kinds of non-POC camera.It it is below the figure of corresponding non-POC camera Concrete structure as acquisition terminal circuit.
Wherein, described image acquisition terminating circuit includes matching unit and video processing circuit.
Wherein, the second access port of coaxial cable external described in one end of described matching unit, described The other end joining unit connects described video processing circuit.
Preferably, described matching unit is resistance R2.
Wherein, described image acquisition terminating circuit includes resistance R2 and video processing circuit, described electricity Second access port of coaxial cable external described in one end of resistance R2, the other end of described resistance R2 connects Described video processing circuit.
Non-POC camera is supply power coaxially circuit and the second isolation capacitance with the difference of POC camera.
After process circuit powers on, switch is opened by control circuit, processes circuit the most not supplying power for outside, Electric capacity C1 shows as high impedance to DC level.Because the resistance (mating 75 ohm) on coaxial line is less, For ohm level, negligible.So time testing circuit input voltage V2 be: V2=VCCxR3/ (R3+R1).
Contrast sixth embodiment of the invention and seventh embodiment of the invention understand, due to R3's Yu R4 Resistance differs greatly, thus the magnitude of voltage of V1, V2 also can difference bigger.
The power supply circuits based on supply power coaxially technology of the present invention, its internal testing circuit can be according to this Individual bigger pressure reduction, uses ADC change-over circuit or directly uses the side such as voltage comparator, current comparator Case, completes POC camera, the differentiation of non-POC camera, and result exports control circuit, controls electricity Road is after receiving signal, it is determined whether needs to open switch, is externally powered.
Fig. 8 is the structure of the power supply circuits based on supply power coaxially technology according to eighth embodiment of the invention Block diagram.The power supply circuits based on supply power coaxially technology of eighth embodiment of the invention, add detection The plug-pull detecting circuit of level signal during hot plug.
Hot plug (hot-plugging, Hot Swap) i.e. warm swap, supports that warm connection function is fair Family allowable is being not related to closed system, takes out and changes electronic unit, thus improve in the case of not cutting off the electricity supply The system timely recovery capability, autgmentability and motility to disaster.
Preferably, eighth embodiment of the invention on the basis of first embodiment of the invention, described place Reason circuit also includes plug-pull detecting circuit, and the signal input part of described plug-pull detecting circuit connects described first The other end of isolated location, the signal output part of described plug-pull detecting circuit connects described control circuit;
Described plug-pull detecting circuit, for detecting the level signal of the access port of Video processing end;When described Level signal switches to DC level signal from exchange level signal or switches to exchange from DC level signal Level signal, then cut off described access port and export the power supply of described image acquisition terminal.
Level signal is a voltage range, it is stipulated that output high level>2.4V, output low level<0.4V.? Under room temperature, general output high level is 3.5V, and output low level is 0.2V.Digital circuit generally only height Level and low level.Single-chip microcomputer can directly detect level signal.
Sometimes, user can change, in the situation of not power-off, the simulation that described supply power coaxially Video processing end is external Camera, is i.e. simulated the hot plug of camera.Defeated to the power supply of external analogue camera at described access port In the case of going out conducting, if POC camera to be replaced by non-POC camera, it may occur that non-POC camera quilt Situation about burning;In the case of described access port exports cut-out to the power supply of external analogue camera, as Non-POC camera is replaced by POC camera by fruit, arises that POC camera is not powered, without video image Situation.So when the situation of not power-off changes external analogue camera, it is necessary to analogue camera is carried out Re-recognize, in order to judge that the power supply of external analogue camera is exported by described access port and whether can turn on. For realizing this function, the level signal change produced when needing to carry out analogue camera hot plug action is carried out Monitoring.Level signal by the access port of detection supply power coaxially Video processing end, it is possible to achieve hot plug In the case of the identification function of analogue camera.
For DC level, C1 is high impedance, but for the video signal of exchange, C1 is Low ESR. Voltage V3 signal is input to plug-pull detecting circuit, the higher pressure DC source of superposition can be avoided to plug inspection The infringement that slowdown monitoring circuit causes.At access port, during as do not carried out hot plug at bnc interface, plug detection electricity Road can detect stable video signal, i.e. an AC signal.Insert when there is heat at bnc interface When pulling out, pull up analogue camera during this period of time in, outside without analogue camera connection, plug-pull detecting circuit Input is the level signal of a direct current, by the most recognizable supply power coaxially video processing circuits of this difference External analogue camera carries out the level signal of hot plug generation, and then completes hot plug detection.Work as control Electric circuit inspection, to when there is hot plug, is cut off described access port and is exported the power supply of external analogue camera, Stopping power supply, testing circuit is started working, and again detects the type of analogue camera.
The power supply circuits based on supply power coaxially technology of eighth embodiment of the invention, outside can automatically identifying The analogue camera that connects also judges whether to be powered external analogue camera.Occur in analogue camera During hot plug, power supply plan can be changed in real time, on the premise of ensureing that analogue camera accesses, improve The reliability and stability of whole power supply circuits.
Above-mentioned various circuit, those skilled in the art can be according to common knowledge, in the skill of the technical program Under art background, select different circuit connecting modes corresponding to realize each circuit with the components and parts of different parameters Function, the most no longer citing repeat.
It is contemplated that protect a kind of power supply circuits based on supply power coaxially technology, it is possible to by detection video Process the electric parameter of the access port of end, whether the image acquisition terminal that Video processing end is external is supported coaxially Power supply is differentiated, and further determines whether to need to be powered image acquisition terminal, and safety is high.
It should be appreciated that the above-mentioned detailed description of the invention of the present invention is used only for exemplary illustration or explanation The principle of the present invention, and be not construed as limiting the invention.Therefore, without departing from the present invention spirit and Any modification, equivalent substitution and improvement etc. done in the case of scope, should be included in the guarantor of the present invention Within the scope of protecting.Additionally, claims of the present invention be intended to fall into scope and Whole in the equivalents on border or this scope and border change and modifications example.

Claims (16)

1. power supply circuits based on supply power coaxially technology, including the process circuit of Video processing end, It is characterized in that, described process circuit includes testing circuit and control circuit, described testing circuit and control Circuit processed is electrically connected with;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electricity Parameter is magnitude of voltage and/or current value, and described access port is the port of incoming image acquisition terminal;
Described control circuit, for according to described electric parameter, controls described access port and adopts described image The break-make of the power supply output of collection terminal.
Power supply circuits based on supply power coaxially technology the most according to claim 1, its feature exists In, described control circuit includes onunit and cutting unit;
Described onunit, if belonging to default first electric parameter scope for described electric parameter, then turns on The power supply of described image acquisition terminal is exported by described access port;
Described cutting unit, if belonging to default second electric parameter scope for described electric parameter, then cuts off The power supply of described image acquisition terminal is exported by described access port.
Power supply circuits based on supply power coaxially technology the most according to claim 1, its feature exists In, described control circuit includes onunit and cutting unit;
Described onunit, for when the described access port power supply outputting cutting to described image acquisition terminal The changing value of disconnected and described electric parameter beyond pre-determined stability electric parameter scope, then turns on described access port The power supply of described image acquisition terminal is exported;
Described cutting unit, for leading the power supply output of described image acquisition terminal when described access port The changing value of logical and described electric parameter beyond pre-determined stability electric parameter scope, then cuts off described access port The power supply of described image acquisition terminal is exported.
Power supply circuits based on supply power coaxially technology the most according to claim 1, its feature exists In, described process circuit also includes power circuit, video processing circuits, the first isolated location, superposition Circuit, switch and partial pressure unit.
Power supply circuits based on supply power coaxially technology the most according to claim 4, its feature exists In, the signal input part of described testing circuit connects one end of partial pressure unit, external coaxial line respectively First access port of cable, first not moved end, one end of the first isolated location of switch, described detection electricity The signal output part on road connects the signal input part of described control circuit, and the signal of described control circuit is defeated Going out to hold the moved end of connecting valve, the second of described switch not moved end connects one end of supercircuit, described The other end of supercircuit connects power circuit, and the other end of described partial pressure unit connects detection input Power end, the other end of described first isolated location connects described video processing circuits.
6., according to the power supply circuits based on supply power coaxially technology described in claim 4 or 5, it is special Levying and be, described first isolated location is electric capacity C1.
7., according to the power supply circuits based on supply power coaxially technology described in claim 4 or 5, it is special Levying and be, described partial pressure unit is resistance R1.
Power supply circuits based on supply power coaxially technology the most according to claim 5, its feature exists In, the second access port of described external coaxial cable connects image acquisition terminating circuit.
Power supply circuits based on supply power coaxially technology the most according to claim 8, its feature exists In, described image acquisition terminating circuit includes supply power coaxially circuit, video processing circuit, is subject to electricity Circuit, matching unit and the second isolated location.
Power supply circuits based on supply power coaxially technology the most according to claim 9, its feature exists In, one end of described supply power coaxially circuit connects the second access port of described external coaxial cable respectively With one end of matching unit, the other end of described matching unit connects one end of the second isolated location, institute The other end stating the second isolated location connects described video processing circuit, described supply power coaxially circuit The other end connect described parasite power supplier.
11. according to the power supply circuits based on supply power coaxially technology described in claim 9 or 10, its Being characterised by, described matching unit is resistance R2.
12. power supply circuits based on supply power coaxially technology according to claim 11, its feature Being, the resistance value of described resistance R2 is 75 ohm.
13. according to the power supply circuits based on supply power coaxially technology described in claim 9 or 10, its Being characterised by, described second isolated location is electric capacity C2.
14. power supply circuits based on supply power coaxially technology according to claim 8, its feature exists In, described image acquisition terminating circuit includes matching unit and video processing circuit.
15. power supply circuits based on supply power coaxially technology according to claim 14, its feature It is, the second access port of coaxial cable external described in one end of described matching unit, described coupling The other end of unit connects described video processing circuit.
16. according to the power supply circuits based on supply power coaxially technology described in claim 4 or 5, and it is special Levying and be, described process circuit also includes plug-pull detecting circuit, and the signal of described plug-pull detecting circuit is defeated Entering end and connect the other end of described first isolated location, the signal output part of described plug-pull detecting circuit is even Connect described control circuit;
Described plug-pull detecting circuit, for detecting the level signal of the access port of Video processing end;Work as institute State level signal switch to DC level signal from exchange level signal or switch from DC level signal To exchanging level signal, then cut off described access port and the power supply of described image acquisition terminal is exported.
CN201510248753.9A 2015-05-14 2015-05-14 A kind of power supply circuits based on supply power coaxially technology Pending CN106303342A (en)

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CN107333085A (en) * 2017-08-16 2017-11-07 浙江大华技术股份有限公司 A kind of power supply unit and electric power system
CN107333214A (en) * 2017-07-21 2017-11-07 柴雪 A kind of audio frequency broadcast system based on area distribution formula audio amplifier
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WO2018233268A1 (en) * 2017-06-21 2018-12-27 Zhejiang Dahua Technology Co., Ltd. System and method for mixed transmission of signals and power supply through a single cable
CN110225284A (en) * 2018-03-02 2019-09-10 杭州海康威视数字技术股份有限公司 A kind of supply power coaxially method, apparatus and system
CN110225283A (en) * 2018-03-02 2019-09-10 杭州海康威视数字技术股份有限公司 A kind of supply power coaxially method, apparatus and system
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CN111147106A (en) * 2019-12-20 2020-05-12 合肥埃科光电科技有限公司 Coaxial line power supply device and method
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WO2018233268A1 (en) * 2017-06-21 2018-12-27 Zhejiang Dahua Technology Co., Ltd. System and method for mixed transmission of signals and power supply through a single cable
CN107333214B (en) * 2017-07-21 2019-11-12 北京智防工程技术研究院有限公司 A kind of audio frequency broadcast system based on area distribution formula speaker
CN107333214A (en) * 2017-07-21 2017-11-07 柴雪 A kind of audio frequency broadcast system based on area distribution formula audio amplifier
CN107483773A (en) * 2017-07-24 2017-12-15 浙江大华技术股份有限公司 A kind of dynamic filter device and method based on vision signal
CN107483773B (en) * 2017-07-24 2019-07-16 浙江大华技术股份有限公司 A kind of dynamic filter device and method based on vision signal
CN107333085A (en) * 2017-08-16 2017-11-07 浙江大华技术股份有限公司 A kind of power supply unit and electric power system
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CN111226432A (en) * 2019-04-02 2020-06-02 深圳市大疆创新科技有限公司 Control method of shooting device and shooting device
CN110568282A (en) * 2019-07-29 2019-12-13 浙江大华技术股份有限公司 Power supply detection circuit and power receiving end detection method
CN110970886A (en) * 2019-12-10 2020-04-07 浙江大华技术股份有限公司 POC-based power supply circuit and method
CN111147106A (en) * 2019-12-20 2020-05-12 合肥埃科光电科技有限公司 Coaxial line power supply device and method
CN111741194A (en) * 2020-06-23 2020-10-02 浙江大华技术股份有限公司 Separated camera, power supply control method and device

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