CN204559753U - 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 PDFInfo
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- CN204559753U CN204559753U CN201520312199.1U CN201520312199U CN204559753U CN 204559753 U CN204559753 U CN 204559753U CN 201520312199 U CN201520312199 U CN 201520312199U CN 204559753 U CN204559753 U CN 204559753U
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Abstract
Based on power supply circuits for supply power coaxially technology, comprise the treatment circuit of Video processing end, described treatment circuit comprises 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, controls the break-make that described access port exports the power supply of described IMAQ terminal.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, should based on the power supply circuits of supply power coaxially technology, by detecting and analyzing the electric parameter of the access port of Video processing end, whether the IMAQ terminal that can identify Video processing end external supports supply power coaxially, and judge whether further to need to power to described IMAQ terminal according to analysis result, fail safe is high.
Description
Technical field
The utility model relates to security protection acquisition technology field, particularly relates to a kind of power supply circuits based on supply power coaxially technology.
Background technology
Supply power coaxially (POC, Power Over Coaxia) is the transmission technology of a kind of video based on coaxial cable, coaxial control, power supply superposition.In coaxial cable transmitting procedure, not only transportation simulator vision signal, coaxial signal but also transmit power supply, is combined with each other by analog video, the signal such as coaxial and power supply, a coaxial line transmits.Apply this POC technology and carry out engineering wiring, not only can save considerable cost, and can shorten the engineering time, application is very extensive at present.For supporting equipment that POC powers, if the POC camera analogue camera of supply power coaxially (support) is after being connected by coaxial line with supply power coaxially circuit, a DC power supply can be superposed on coaxial line, the voltage compare of this DC power supply is high, usually can reach 10V and more than.This voltage is connected on POC camera can meet power reguirements, if but common analogue camera (not supporting POC) is connected on this voltage by client by mistake, the problem of being burnt by general camera will be there is.
Summary of the invention
The purpose of this utility model is to provide a kind of power supply circuits based on supply power coaxially technology, can by detecting the electric parameter of the access port of Video processing end, whether the IMAQ terminal external to Video processing end supports that supply power coaxially is differentiated, and judge whether further to need to power to IMAQ terminal, fail safe is high.
According to the utility model, provide a kind of power supply circuits based on supply power coaxially technology, comprise the treatment circuit of Video processing end, described treatment circuit comprises testing circuit and control circuit, and described testing circuit and control circuit are electrically connected;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electric 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 the break-make that described access port exports the power supply of described IMAQ terminal.
Wherein, described control circuit comprises onunit and cutting unit;
Described onunit, if belong to default first electric parameter scope for described electric parameter, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, if belong to default second electric parameter scope for described electric parameter, then cuts off described access port and exports the power supply of described IMAQ terminal.
Wherein, described control circuit comprises onunit and cutting unit;
Described onunit, for cutting off and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope when described access port exports the power supply of described IMAQ terminal, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, for exporting conducting when described access port to the power supply of described IMAQ terminal and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope, then cuts off described access port and exports the power supply of described IMAQ terminal.
Wherein, described treatment circuit also comprises 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 respectively, first access port of external coaxial cable, first not moved end of switch, one end of first isolated location, the signal output part of described testing circuit connects the signal input part of described control circuit, the moved end of the signal output part connecting valve of described control circuit, described switch second not moved end connect one end of supercircuit, the other end of described supercircuit connects power circuit, the other end of described partial pressure unit connects detection input supply terminal, 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 connection layout of described external coaxial cable is as acquisition terminal circuit.
Wherein, described IMAQ terminating circuit comprises 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 access port of described external coaxial cable and one end of matching unit respectively, 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, and the other end of described supply power coaxially circuit connects 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 IMAQ terminating circuit comprises matching unit and video processing circuit.
Wherein, the second access port of coaxial cable external described in one end of described matching unit, the other end of described matching unit connects described video processing circuit.
Wherein, described treatment circuit also comprises plug-pull detecting circuit, and the signal input part of described plug-pull detecting circuit connects the other end of described first isolated location, and 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 interchange level signal or switches to interchange level signal from DC level signal, then cut off described access port and the power supply of described IMAQ terminal is exported.
The utility model provides a kind of power supply circuits based on supply power coaxially technology, comprises the treatment circuit of Video processing end, and described treatment circuit comprises 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, controls the break-make that described access port exports the power supply of described IMAQ terminal.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, should based on the power supply circuits of supply power coaxially technology, by detecting and analyzing the electric parameter of the access port of Video processing end, whether the IMAQ terminal that can identify Video processing end external supports supply power coaxially, and judge whether further to need to power to described IMAQ terminal according to analysis result, fail safe is high.
Accompanying drawing explanation
Fig. 1 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model first execution mode;
Fig. 2 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model second execution mode;
Fig. 3 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 3rd execution mode;
Fig. 4 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 4th execution mode;
Fig. 5 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 5th execution mode;
Fig. 6 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 6th execution mode;
Fig. 7 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 7th execution mode;
Fig. 8 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 8th execution mode.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
It should be noted that: hereinafter, supply power coaxially (POC, Power Over Coaxia) is the technology of a kind of video based on coaxial line, coaxial control, power supply superposition.Analogue camera (Analog camera) is the camera of output signal for analog signal.ADC (Analog-to-Digital Converte) is A/D 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, and be the plural number that take resistance value as real part and reactance value is imaginary part, unit is ohm.
Fig. 1 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model first execution mode.
Should based on the power supply circuits of supply power coaxially technology, comprise the treatment circuit of Video processing end, described treatment circuit comprises testing circuit and control circuit, and described testing circuit and control circuit are electrically connected;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electric 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 the break-make that described access port exports the power supply of described IMAQ terminal.
Electrical quantity refers to the power consumption parameter data of power consumption equipment.When detecting magnitude of voltage, can voltage sensor be selected, when detecting current value, can current sensor be selected, or directly select voltage-current sensor, both can detect current value and also can detect magnitude of voltage.
Current sensor is a kind of checkout gear, the information of tested electric current can be experienced, and can will detect the information experienced, the information being for conversion into the signal of telecommunication or other desired forms meeting certain standard needs according to certain rules exports, to meet the requirements such as the transmission of information, process, storage, display, record and control.Current sensor is different according to measuring principle, mainly can be divided into shunt, electromagnetic current transducer and electronic current mutual inductor.
Voltage sensor is a kind of checkout gear, the information of tested voltage can be experienced, and can will detect the information experienced, the information being for conversion into the signal of telecommunication or other desired forms meeting certain standard needs according to certain rules exports, to meet the requirements such as the transmission of information, process, storage, display, record and control.Voltage sensor is mainly divided into direct current voltage sensor and AC voltage sensor two kinds, and AC voltage sensor is the instrument that tested alternating current (alternating voltage) can be converted to linearly ratio output dc voltage or direct current by one.Direct current voltage sensor is a kind of instrument that tested direct voltage can be converted to linearly ratio output dc voltage or direct current.
Described access port is the interface of access coaxial line.Described coaxial line is for connecting Video processing end and the IMAQ terminal of supply power coaxially, and the interface of coaxial line is preferably bnc interface.
The power supply circuits based on supply power coaxially technology of the utility model first execution mode, by detecting and analyzing the electric parameter of the access port of Video processing end, whether the IMAQ terminal that can identify Video processing end external supports supply power coaxially, and judge whether further to need to power to described IMAQ terminal according to analysis result, fail safe is high.
Fig. 2 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model second execution mode.The power supply circuits based on supply power coaxially technology of the utility model second execution mode, add the cutting unit that access port described in conducting exports the power supply of described IMAQ terminal with the described access port of cut-out the onunit that the power supply of described IMAQ terminal exports.
Preferably, the utility model second execution mode is on the basis of the utility model first execution mode, and described control circuit comprises onunit and cutting unit;
Described onunit, if belong to default first electric parameter scope for described electric parameter, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, if belong to default second electric parameter scope for described electric parameter, then cuts off described access port and exports the power supply of described IMAQ terminal.
Preferably, external described IMAQ terminal is analogue camera, and distinguish by whether supporting that POC powers, analogue camera can be divided into POC camera and two kinds, non-POC camera.The described default electric parameter scope presetting the corresponding POC camera of the first electric parameter scope, the described default electric parameter scope presetting the corresponding non-POC camera of the second electric parameter scope.
Aforesaid way analyzes the absolute value of described electric parameter, by analyzing the absolute value of electric parameter, can help to identify whether external described IMAQ terminal supports that POC powers.After detecting electric parameter, by analysis, described access port can complete the identification of external IMAQ terminal and determine whether to need supplying power for outside.
Preferably, the utility model second execution mode is on the basis of the utility model first execution mode, and described control circuit comprises onunit and cutting unit;
Described onunit, for cutting off and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope when described access port exports the power supply of described IMAQ terminal, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, for exporting conducting when described access port to the power supply of described IMAQ terminal and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope, then cuts off described access port and exports the power supply of described IMAQ terminal.
Aforesaid way analyzes the relative difference of described electric parameter, by analyzing the relative difference of electric parameter, can help to identify whether external IMAQ terminal supports that POC powers.Pre-determined stability electric parameter scope can be arranged according to the data of actual measurement, and the data of actual measurement can according to the model difference difference to some extent of external IMAQ terminal.
The power supply circuits based on supply power coaxially technology of the utility model second execution mode, can be completed the resolution of analogue camera kind, and then automatically determine whether to need supplying power for outside by the difference detecting the POC camera electric parameter corresponding with non-POC camera.
Fig. 3 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 3rd execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 3rd execution mode, are illustrated the particular circuit configurations of described treatment circuit.
The utility model the 3rd execution mode is on the basis of the utility model first execution mode, and described treatment circuit also comprises 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 respectively, first access port of external coaxial cable, first not moved end of switch, one end of first isolated location, the signal output part of described testing circuit connects the signal input part of described control circuit, the moved end of the signal output part connecting valve of described control circuit, described switch second not moved end connect one end of supercircuit, the other end of described supercircuit connects power circuit, the other end of described partial pressure unit connects detection input supply terminal, the other end of described first isolated location connects described video processing circuits.
The power supply circuits based on supply power coaxially technology of the utility model the 3rd execution mode are automatic detection circuits, can automatically identify external analogue camera and judge whether to power to external analogue camera.
Fig. 4 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 4th execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 4th execution mode, are illustrated the particular circuit configurations of described treatment circuit.
The utility model the 4th execution mode is on the basis of the utility model the 3rd execution mode, and described first isolated location is electric capacity C1, and described partial pressure unit is resistance R1.
Preferably, one end of the signal input part difference contact resistance R1 of described testing circuit, first access port of external coaxial cable, first not moved end of switch, one end of electric capacity C1, the signal output part of described testing circuit connects the signal input part of described control circuit, the moved end of the signal output part connecting valve of described control circuit, described switch second not moved end connect one end of supercircuit, the other end of described supercircuit connects power circuit, the other end of described resistance R1 connects detection input supply terminal, the other end of described electric capacity C1 connects described video processing circuits.
Treatment circuit can realize power supply and Video processing, it can be had by functional module segmentation: power circuit, power for POC; Supercircuit, for being separated power supply and vision signal; Switch, for realize by control circuit judge the need of supplying power for outside; By the size of electric parameter, testing circuit, for detecting the electric parameter of access port, determines whether external analogue camera supports that POC powers.VCC, namely detecting with input voltage value (corresponding detection input supply terminal), for detecting the power supply whether supporting POC, being generally low-voltage; R1, i.e. detection divider resistance, for detecting the divider resistance of use; C1, for isolated DC power supply, and inputs to video processing circuits by vision signal.
Preferably, equivalent resistance/(the described equivalent resistance+detection divider resistance value) of the video processing circuit of the IMAQ terminal that described magnitude of voltage=detection input voltage value * is external.
The power supply circuits based on supply power coaxially technology of the utility model the 4th execution mode are automatic detection circuits, can automatically identify external analogue camera and judge whether to power to external analogue camera.And the electronic devices and components selected are simple, improve the compactedness of whole power supply circuits, and reduce the cost of power supply circuits.
Fig. 5 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 5th execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 5th execution mode, are illustrated the particular circuit configurations of the IMAQ terminating circuit of outside.
The utility model the 5th execution mode is on the basis of the utility model the 4th execution mode, and the second access port connection layout of described external coaxial cable is as acquisition terminal circuit.
External IMAQ terminal is analogue camera, and distinguish by whether supporting that POC powers, analogue camera can be divided into POC camera and two kinds, non-POC camera.It is below the concrete structure of the IMAQ terminating circuit of corresponding POC camera.
Wherein, described IMAQ terminating circuit comprises 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 access port of described external coaxial cable and one end of matching unit respectively, 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, and the other end of described supply power coaxially circuit connects described parasite power supplier.
The power supply circuits based on supply power coaxially technology of the utility model the 5th execution mode, be one automatically detect and the smart circuit of power supply is provided, automatically can identify analogue camera and judge whether to power to analogue camera, according to judged result conducting or cut-out power supply.
Fig. 6 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 6th execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 6th execution mode, are illustrated the particular circuit configurations of the IMAQ terminating circuit of outside.
The utility model the 6th execution mode is on the basis of the utility model the 5th execution mode, 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 access port of described external coaxial cable and one end of resistance R2 respectively, the other end of described resistance R2 connects one end of electric capacity C2, the other end of described electric capacity C2 connects described video processing circuit, and the other end of described supply power coaxially circuit connects described parasite power supplier.
POC camera can support the analogue camera of supply power coaxially, can be subdivided into: parasite power supplier by functional module, for obtaining electric current from supply power coaxially circuit and powering to POC camera; Supply power coaxially circuit, for keeping high resistant by while power delivery to parasite power supplier to vision signal, supply power coaxially circuit can be equivalent to a resistance (resistance is larger) before power supply; R2, C2 are build-out resistor and capacitance.R3 is the equivalent resistance of video processing circuit, in general less.
After supply power coaxially video processing circuits powers on, control circuit is by switch opens, and the temporary transient not supplying power for outside of supply power coaxially video processing circuits, electric capacity C1, C2 shows as high impedance to DC level.Because the resistance on coaxial line is less, be ohm level, can ignore.So time testing circuit input voltage V1 be: V1=VCCxR4/ (R4+R1).
The power supply circuits based on supply power coaxially technology of the utility model the 6th execution mode, be one automatically detect and the smart circuit of power supply is provided, automatically can identify analogue camera and judge whether to power to analogue camera, according to judged result conducting or cut-out power supply.And the electronic devices and components selected are simple, improve the compactedness of whole power supply circuits, and reduce the cost of power supply circuits.
Fig. 7 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 7th execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 7th execution mode, are illustrated the particular circuit configurations of the IMAQ terminating circuit of outside.
The utility model the 7th execution mode is on the basis of the utility model the 4th execution mode, and the second access port connection layout of described external coaxial cable is as acquisition terminal circuit.
External IMAQ terminal is analogue camera, and distinguish by whether supporting that POC powers, analogue camera can be divided into POC camera and two kinds, non-POC camera.It is below the concrete structure of the IMAQ terminating circuit of corresponding non-POC camera.
Wherein, described IMAQ terminating circuit comprises matching unit and video processing circuit.
Wherein, the second access port of coaxial cable external described in one end of described matching unit, the other end of described matching unit connects described video processing circuit.
Preferably, described matching unit is resistance R2.
Wherein, described IMAQ terminating circuit comprises resistance R2 and video processing circuit, the second access port of coaxial cable external described in one end of described resistance R2, and the other end of described resistance R2 connects described video processing circuit.
The difference of non-POC camera and POC camera is supply power coaxially circuit and the second isolation capacitance.
After treatment circuit powers on, control circuit is by switch opens, and treatment circuit temporarily 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, is ohm level, can ignores.So time testing circuit input voltage V2 be: V2=VCCxR3/ (R3+R1).
Contrast the utility model the 6th execution mode and the utility model the 7th execution mode known, because the resistance of R3 and R4 differs greatly, thus the magnitude of voltage of V1, V2 also can difference larger.
Power supply circuits based on supply power coaxially technology of the present utility model, the testing circuit of its inside can according to this larger pressure reduction, use ADC change-over circuit or directly use the scheme such as voltage comparator, current comparator, complete the differentiation of POC camera, non-POC camera, and result is outputted to control circuit, control circuit, after receiving signal, determines whether to need, by switch opens, externally to power.
Fig. 8 is the block diagram of the power supply circuits based on supply power coaxially technology according to the utility model the 8th execution mode.The power supply circuits based on supply power coaxially technology of the utility model the 8th execution mode, add the plug-pull detecting circuit of level signal when detecting hot plug.
Hot plug (hot-plugging, Hot Swap) i.e. warm swap, support that warm connection function allows user in not shutdown system, take out when not cutting off the electricity supply and change electronic unit, thus the system that improves is to the timely recovery capability of disaster, autgmentability and flexibility.
Preferably, the utility model the 8th execution mode is on the basis of the utility model first execution mode, described treatment circuit also comprises plug-pull detecting circuit, the signal input part of described plug-pull detecting circuit connects the other end of described first isolated location, and 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 interchange level signal or switches to interchange level signal from DC level signal, then cut off described access port and the power supply of described IMAQ terminal is exported.
Level signal is a voltage range, and regulation exports high level >2.4V, output low level <0.4V.At room temperature, general output high level is 3.5V, and output low level is 0.2V.Digital circuit only has high level and low level usually.Single-chip microcomputer can direct-detection level signal.
Sometimes, user can change the external analogue camera of described supply power coaxially Video processing end in the situation of not power-off, namely carries out the hot plug of analogue camera.When described access port exports conducting to the power supply of external analogue camera, if POC camera is replaced by non-POC camera, non-POC camera can be there is by the situation of burning; When described access port to the power supply of external analogue camera export cut off, if non-POC camera is replaced by POC camera, just there will be POC camera and do not power, without the situation of video image.So when the situation of not power-off changes external analogue camera, again must identify analogue camera, to judge whether the power supply output of described access port to external analogue camera can conducting.For realizing this function, the level signal change produced when carrying out hot plug action to analogue camera is needed to monitor.By detecting the level signal of the access port of supply power coaxially Video processing end, the recognition function of the analogue camera in hot plug situation can be realized.
For DC level, C1 is high impedance, but for the vision signal exchanged, C1 is Low ESR.Voltage V3 signal is input to plug-pull detecting circuit, the infringement that the higher pressure DC power supply can avoiding superposing causes plug-pull detecting circuit.At access port, during as do not carried out hot plug in bnc interface place, plug-pull detecting circuit can detect stable vision signal, i.e. an AC signal.When there is hot plug at bnc interface place, pull up analogue camera during this period of time in, outside connects without analogue camera, the input of plug-pull detecting circuit is the level signal of a direct current, carried out the level signal of hot plug generation by this difference with regard to the analogue camera that identifiable design supply power coaxially video processing circuits is external, and then complete hot plug detection.When control circuit detects generation hot plug, cut off described access port and export the power supply of external analogue camera, stop 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 the utility model the 8th execution mode, can automatically identify external analogue camera and judge whether to power to external analogue camera.When analogue camera generation hot plug, power supply plan can be changed in real time, under the prerequisite ensureing analogue camera access, improve the reliability and stability of whole power supply circuits.
Above-mentioned various circuit, those skilled in the art can, according to common practise, under the technical background of the technical program, select the components and parts of different circuit connecting modes and different parameters to realize function corresponding to each circuit, and no longer citing repeats herein.
The utility model is intended to protect a kind of power supply circuits based on supply power coaxially technology; can by detecting the electric parameter of the access port of Video processing end; whether the IMAQ terminal external to Video processing end supports that supply power coaxially is differentiated; and judge whether further to need to power to IMAQ terminal, fail safe is high.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (16)
1. based on power supply circuits for supply power coaxially technology, comprise the treatment circuit of Video processing end, it is characterized in that, described treatment circuit comprises testing circuit and control circuit, and described testing circuit and control circuit are electrically connected;
Described testing circuit, for detecting the electric parameter of the access port of described Video processing end, described electric 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 the break-make that described access port exports the power supply of described IMAQ terminal.
2. the power supply circuits based on supply power coaxially technology according to claim 1, is characterized in that, described control circuit comprises onunit and cutting unit;
Described onunit, if belong to default first electric parameter scope for described electric parameter, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, if belong to default second electric parameter scope for described electric parameter, then cuts off described access port and exports the power supply of described IMAQ terminal.
3. the power supply circuits based on supply power coaxially technology according to claim 1, is characterized in that, described control circuit comprises onunit and cutting unit;
Described onunit, for cutting off and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope when described access port exports the power supply of described IMAQ terminal, then access port described in conducting exports the power supply of described IMAQ terminal;
Described cutting unit, for exporting conducting when described access port to the power supply of described IMAQ terminal and the changing value of described electric parameter exceeds pre-determined stability electric parameter scope, then cuts off described access port and exports the power supply of described IMAQ terminal.
4. the power supply circuits based on supply power coaxially technology according to claim 1, is characterized in that, described treatment circuit also comprises power circuit, video processing circuits, the first isolated location, supercircuit, switch and partial pressure unit.
5. the power supply circuits based on supply power coaxially technology according to claim 4, it is characterized in that, the signal input part of described testing circuit connects one end of partial pressure unit respectively, first access port of external coaxial cable, first not moved end of switch, one end of first isolated location, the signal output part of described testing circuit connects the signal input part of described control circuit, the moved end of the signal output part connecting valve of described control circuit, described switch second not moved end connect one end of supercircuit, the other end of described supercircuit connects power circuit, the other end of described partial pressure unit connects detection input supply terminal, the other end of described first isolated location connects described video processing circuits.
6. the power supply circuits based on supply power coaxially technology according to claim 4 or 5, is characterized in that, described first isolated location is electric capacity C1.
7. the power supply circuits based on supply power coaxially technology according to claim 4 or 5, is characterized in that, described partial pressure unit is resistance R1.
8. the power supply circuits based on supply power coaxially technology according to claim 5, is characterized in that, the second access port connection layout of described external coaxial cable is as acquisition terminal circuit.
9. the power supply circuits based on supply power coaxially technology according to claim 8, is characterized in that, described IMAQ terminating circuit comprises supply power coaxially circuit, video processing circuit, parasite power supplier, matching unit and the second isolated location.
10. the power supply circuits based on supply power coaxially technology according to claim 9, it is characterized in that, one end of described supply power coaxially circuit connects the second access port of described external coaxial cable and one end of matching unit respectively, 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, and the other end of described supply power coaxially circuit connects described parasite power supplier.
11. power supply circuits based on supply power coaxially technology according to claim 9 or 10, it is characterized in that, described matching unit is resistance R2.
12. power supply circuits based on supply power coaxially technology according to claim 11, is characterized in that, the resistance value of described resistance R2 is 75 ohm.
13. power supply circuits based on supply power coaxially technology according to claim 9 or 10, it is characterized in that, described second isolated location is electric capacity C2.
14. power supply circuits based on supply power coaxially technology according to claim 8, is characterized in that, described IMAQ terminating circuit comprises matching unit and video processing circuit.
15. power supply circuits based on supply power coaxially technology according to claim 14, is characterized in that, the second access port of coaxial cable external described in one end of described matching unit, and the other end of described matching unit connects described video processing circuit.
16. power supply circuits based on supply power coaxially technology according to claim 4 or 5, it is characterized in that, described treatment circuit also comprises plug-pull detecting circuit, the signal input part of described plug-pull detecting circuit connects the other end of described first isolated location, and 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 interchange level signal or switches to interchange level signal from DC level signal, then cut off described access port and the power supply of described IMAQ terminal is exported.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323739A (en) * | 2019-06-20 | 2019-10-11 | 浙江大华技术股份有限公司 | A kind of power supply unit and power supply system |
| 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 |
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2015
- 2015-05-14 CN CN201520312199.1U patent/CN204559753U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323739A (en) * | 2019-06-20 | 2019-10-11 | 浙江大华技术股份有限公司 | A kind of power supply unit and power supply system |
| CN110323739B (en) * | 2019-06-20 | 2020-11-06 | 浙江大华技术股份有限公司 | Power supply equipment and power supply system |
| US11870596B2 (en) | 2019-06-20 | 2024-01-09 | Zhejiang Dahua Technology Co., Ltd. | Systems and devices for power supply |
| 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 |
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