CN204465724U - The treatment circuit of a kind of rear end, front end and supply power coaxially circuit - Google Patents
The treatment circuit of a kind of rear end, front end and supply power coaxially circuit Download PDFInfo
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- CN204465724U CN204465724U CN201520090832.7U CN201520090832U CN204465724U CN 204465724 U CN204465724 U CN 204465724U CN 201520090832 U CN201520090832 U CN 201520090832U CN 204465724 U CN204465724 U CN 204465724U
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Abstract
The treatment circuit of a kind of rear end analog video signal and DC power supply, the treatment circuit of front end analogue vision signal and DC power supply, and the supply power coaxially circuit of analog video signal, the treatment circuit of rear end and the treatment circuit of front end include for isolated DC power supply and by the analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the DC power supply of DC power supply, analog video signal and DC power supply can be kept apart, analog video signal can be added in DC power supply, mutually unaffected, be not mutually exclusive, realize function simulation HD video line superposing DC power supply.Visible, the treatment circuit of the treatment circuit of this rear end and front end is electrically connected with the two ends of coaxial line respectively, coaxial line just can be allowed simultaneously to transmit DC power supply and analog video signal, not only cost-saving, and shorten the engineering time.
Description
Technical field
The utility model relates to for electrical domain, particularly the treatment circuit of a kind of rear end analog video signal and DC power supply, front end analogue vision signal and the treatment circuit of DC power supply and the supply power coaxially circuit of analog video signal.
Background technology
In co-axial cables transport process, not only need transportation simulator vision signal (comprising high definition analog video signal), coaxial signal but also need to transmit power supply, be combined with each other by analog video, the signal such as coaxial and power supply, a coaxial line transmits.Apply the engineering wiring of this transmission means, not only can save considerable cost, and can the engineering time be shortened.POE (Power Over Ethernet, active Ethernet) can realize ethernet network by 10base-T, 100BASE-TX, 1000BASE-T and power, achieve centralized power reliably to power and easy to use, the network terminal does not need external power supply, only needs a netting twine just can power.This technology is widely used at present, can be the terminal transmission data signal based on IP (Internet Protocol, the agreement interconnected between network), can also provide direct current supply by kind equipment simultaneously for this reason.Network signal is carried out together with power supply on netting twine the POE scheme transmitted, make transmitting procedure digitlization, networking, the good reliability of transmission.But such scheme also possesses certain defect, as: the first, POE scheme is transmitting network data, and need image digitazation before transmission, cost compare is high.The second, at present monitoring field uses coaxial line in a large number, cannot use the scheme of POE.
Utility model content
The purpose of this utility model is to provide the treatment circuit of a kind of rear end analog video signal and DC power supply, front end analogue vision signal and the treatment circuit of DC power supply and the supply power coaxially circuit of analog video signal, the treatment circuit of the treatment circuit of this rear end and front end is electrically connected with the two ends of coaxial line respectively, coaxial line just can be allowed to transmit DC power supply and analog video signal simultaneously, not only cost-saving, and shorten the engineering time.
According to an aspect of the present utility model, the treatment circuit of a kind of rear end analog video signal and DC power supply is provided, to comprise for isolated DC power supply and by the analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the DC power supply of DC power supply, described analog video signal comprises electric capacity C2 by circuit, described DC power supply comprises diode D2 and inductance L 2 by circuit, one end of described electric capacity C2 connects vision signal end, the other end of described electric capacity C2 connects one end of inductance L 2 respectively, the positive pole of diode D2, the other end of described inductance L 2 is all connected power input with the negative pole of diode D2.
Wherein, the positive pole also matching connection circuit of described diode D2, described match circuit is termination matching circuit, described termination matching circuit comprise wear dimension the south connect match circuit and RC termination matching circuit.
Wherein, described vision signal end also connects video processing circuits, described video processing circuits comprises video a/d change-over circuit and low pass filter, and one end of described low pass filter connects video a/d change-over circuit, and the other end of described low pass filter connects one end of described electric capacity C2.
Wherein, the negative pole of described diode D2 also connects the supercircuit for realizing high impedance to analog video signal, described supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
Wherein, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of the other end difference contact resistance R5 of described electric capacity C1, the other end of resistance R6, the negative pole of described diode D2.
Wherein, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2 respectively, the other end of resistance R5, the other end of described resistance R6 connects the negative pole of described diode D2.
Wherein, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2, the other end of the other end difference contact resistance R6 of described resistance R5, the negative pole of described diode D2.
Wherein, described supercircuit comprises electric capacity C21, resistance R21, resistance R23, resistance R24, triode Q21, triode Q22 and resistance R22, one end of described electric capacity C21 connects power input respectively, one end of resistance R21, one end of resistance R23, one end of resistance R24, the other end of the other end difference contact resistance R21 of described electric capacity C21, the base stage of triode Q21, one end of resistance R22, the other end of the emitter difference contact resistance R23 of described triode Q21, the base stage of triode Q22, the other end of the emitter contact resistance R24 of described triode Q22, the collector electrode of the other end difference connecting triode Q21 of described resistance R22, the collector electrode of triode Q22, the negative pole of described diode D2.
Wherein, the negative pole of described diode D2 also connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, the negative pole of described diode D2.
Wherein, one end of described supercircuit connects the negative pole of described diode D2, the other end of described supercircuit connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, described supercircuit.
Wherein, the power input of described current foldback circuit also connects lc circuit; described lc circuit comprises inductance L 1 and electric capacity C3; one end of described inductance L 1 connects power input; the other end of described inductance L 1 connects one end of electric capacity C3, the power input of described current foldback circuit, the other end ground connection of described electric capacity C3 respectively.
According to another aspect of the present utility model, the treatment circuit of a kind of front end analogue vision signal and DC power supply is provided, to comprise for isolated DC power supply and by the second analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the second DC power supply of DC power supply, described second analog video signal comprises electric capacity C11 by circuit, described second DC power supply comprises diode D11 and inductance L 3 by circuit, one end of described electric capacity C11 connects the second vision signal end, the other end of described electric capacity C11 connects one end of inductance L 3 respectively, the negative pole of diode D11, the other end of described inductance L 3 is all connected power input with the positive pole of diode D11.
Wherein, the negative pole of described diode D11 also connects the second match circuit, and described second match circuit is source match circuit, and described source match circuit comprises Dai Weinan source match circuit and RC source match circuit.
Wherein, the positive pole of described diode D11 also connects the second supercircuit for realizing high impedance to analog video signal, described second supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
Wherein, described second supercircuit comprises resistance R11, triode Q8, resistance R10, triode Q7, electric capacity C9 and resistance R9, one end of described resistance R11 connects power output end respectively, one end of resistance R10, one end of electric capacity C9, the emitter of the other end connecting triode Q8 of described resistance R11, the base stage of the other end difference connecting triode Q8 of described resistance R10, the emitter of triode Q7, the base stage of the other end difference connecting triode Q7 of described electric capacity C9, one end of resistance R9, the collector electrode of the other end difference connecting triode Q8 of described resistance R9, the collector electrode of triode Q7, the positive pole of described diode D11.
According to another aspect of the present utility model, a kind of supply power coaxially circuit of analog video signal is provided, comprise coaxial line, one end of described coaxial line connects the treatment circuit of above-mentioned rear end analog video signal and DC power supply, and the other end of described coaxial line connects the treatment circuit of above-mentioned front end analogue vision signal and DC power supply.
A kind of rear end analog video signal that the utility model provides and the treatment circuit of DC power supply, the treatment circuit of front end analogue vision signal and DC power supply, and the supply power coaxially circuit of analog video signal, the treatment circuit of rear end and the treatment circuit of front end include for isolated DC power supply and by the analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the DC power supply of DC power supply, when treatment circuit transmission DC power supply, DC power supply experiences 0 impedance on the circuit that both diode and inductance are in parallel, DC power supply can directly from the interface I/O of coaxial line.Meanwhile, electric capacity is high impedance concerning DC power supply, so DC power supply can be separated with the analog video signal transmitted through vision signal end by electric capacity, DC power supply can not have influence on the I/O of analog video signal.When treatment circuit transportation simulator vision signal, because analog video signal is AC signal, and the impedance of electric capacity is lower, and so for AC signal, what experience is Low ESR.And both diode and inductance circuit in parallel belongs to high impedance for analog video signal, namely the impedance experienced of the power end of analog video signal is larger.So, analog video signal and DC power supply isolated, analog video signal can be added in DC power supply, mutually unaffected, be not mutually exclusive, realize function analog video line superposing DC power supply.Visible, the treatment circuit of the treatment circuit of this rear end and front end is electrically connected with the two ends of coaxial line respectively, coaxial line just can be allowed simultaneously to transmit DC power supply and analog video signal, not only cost-saving, and shorten the engineering time.
Accompanying drawing explanation
Fig. 1 is the circuit diagram according to the rear end analog video signal of the utility model first execution mode and the treatment circuit of power supply;
Fig. 2 is the circuit diagram according to the rear end analog video signal of the utility model second execution mode and the treatment circuit of power supply;
Fig. 3 is the circuit diagram according to the rear end analog video signal of the utility model the 3rd execution mode and the treatment circuit of power supply;
Fig. 4 is the circuit diagram according to the rear end analog video signal of the utility model the 4th execution mode and the treatment circuit of power supply;
Fig. 5 is the circuit diagram according to the rear end analog video signal of the utility model the 5th execution mode and the treatment circuit of power supply;
Fig. 6 is the circuit diagram according to the rear end analog video signal of the utility model the 6th execution mode and the treatment circuit of power supply;
Fig. 7 is the circuit diagram according to the rear end analog video signal of the utility model the 7th execution mode and the treatment circuit of power supply;
Fig. 8 is the circuit diagram according to the rear end analog video signal of the utility model the 8th execution mode and the treatment circuit of power supply;
Fig. 9 is the circuit diagram according to the front end analogue vision signal of the utility model the 9th execution mode and the treatment circuit of power supply;
Figure 10 is the block diagram of the supply power coaxially circuit of analog video signal according to the utility model the tenth 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, impedance (Impedance) mainly refers to electrical impedance, and be the plural number that take resistance value as real part and reactance value is imaginary part, unit is ohm.Reactance comprises capacitive reactance and induction reactance.In general electric capacity has showed capacitive reactance, and inductance has showed induction reactance.
Fig. 1 is the circuit diagram according to the rear end analog video signal of the utility model first execution mode and the treatment circuit of power supply.The treatment circuit of this rear end can be applicable to back-end processing equipment place, as the DVR (Digital Video Recorder, DVR, digital video recorder) in supervisory control system.
The treatment circuit of described a kind of rear end analog video signal and DC power supply, to comprise for isolated DC power supply and by the analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the DC power supply of DC power supply, described analog video signal comprises electric capacity C2 by circuit, described DC power supply comprises diode D2 and inductance L 2 by circuit, one end of described electric capacity C2 connects vision signal end, the other end of described electric capacity C2 connects one end of inductance L 2 respectively, the positive pole of diode D2, the other end of described inductance L 2 is all connected power input with the negative pole of diode D2.
The treatment circuit of this rear end and outside coaxial line are electrically connected, when the treatment circuit transmission DC power supply of rear end, DC power supply experiences 0 impedance on the circuit that both diode D2 and inductance L 2 are in parallel, and DC power supply can directly export from the interface of coaxial line.Meanwhile, electric capacity C2 is high impedance concerning DC power supply, so DC power supply can be separated with the analog video signal transmitted through vision signal end by electric capacity C2, DC power supply can not have influence on the input of analog video signal.When the treatment circuit transportation simulator vision signal of rear end, because analog video signal is AC signal, and the impedance of electric capacity C2 is lower, and so for AC signal, what experience is Low ESR.And both diode D2 and inductance L 2 circuit in parallel belongs to high impedance for analog video signal.So, analog video signal and DC power supply isolated, analog video signal can be added in DC power supply, mutually unaffected, be not mutually exclusive, realize function simulation HD video line superposing DC power supply.Visible, the treatment circuit of this rear end and coaxial line are electrically connected, coaxial line just can be allowed simultaneously to transmit DC power supply and analog video signal, not only cost-saving, and shorten the engineering time.
Fig. 2 is the circuit diagram according to the rear end analog video signal of the utility model second execution mode and the treatment circuit of power supply.
Wherein, the positive pole also matching connection circuit of described diode D2, described match circuit is termination matching circuit, described termination matching circuit comprise wear dimension the south connect match circuit and RC termination matching circuit.Particularly, described match circuit and diode D2, inductance L 2 three are in parallel.
Diode D2, inductance L 2, electric capacity C2 and match circuit constitute DC power supply, analog video signal superposition nucleus module, and it mainly completes superposing of DC power supply and analog video signal.The operation principle of this treatment circuit is: for DC power supply, and inductance L 2 is without induction reactance, and namely for DC power supply, it is 0 impedance that the circuit of diode D2, inductance L 2 and match circuit three parallel connection is experienced.Meanwhile, electric capacity C2 is high impedance concerning DC power supply, so the analog video signal that DC power supply and vision signal end are transmitted can be separated by electric capacity C2, DC power supply can not have influence on the input of analog video signal.When treatment circuit and the electric connection of outside coaxial line of this rear end, DC power supply can directly from one end of coaxial line (as, coaxial interface BNC1, it can certainly be RCA interface, hereafter for BNC1) output to front end, and give communication front-end equipment, as camera or video camera are powered.And for the analog video signal that the coaxial interface BNC1 from coaxial line inputs, because analog video signal belongs to AC signal.For AC signal, the impedance of electric capacity C2 is lower, namely for analog video signal, being input to what experience the process of analog video A/D change-over circuit from coaxial interface BNC1 is Low ESR, but what experience on the circuit of diode D2, inductance L 2 and match circuit three parallel connection is high impedance.By this operation principle, analog video signal and VCC DC power supply can be kept apart, make analog video signal can be added in VCC DC power supply, mutually unaffected, be not mutually exclusive, realize the function superposing power supply on simulation HD video line.
The existence of diode D2 occurs that because electric current is discontinuous the situation that inductance both end voltage fluctuates occurs to prevent.After when the treatment circuit and the electric connection of outside coaxial line of this rear end, when again pulling up coaxial line, the energy in inductance L 2 can be released by D2.
Because the spectral range of analog video signal is comparatively wide, the highlyest tens or up to a hundred million may be reached.The signal of such higher-frequency, when superposing power module, may exist, because of impedance discontinuity, the problems of Signal Integrity such as reflection occur, analog video signal is distorted, and then have influence on the definition of image.After increasing termination matching circuit, effectively can reduce signal reflex.The matching way of current termination matching circuit has: the mode such as source series connection coupling, terminal coupling in parallel, Dai Weinan coupling, RC network coupling, diode coupling, this several mode can reach the object of terminal coupling.
Wherein, described vision signal end also connects video processing circuits, described video processing circuits comprises video a/d change-over circuit and low pass filter, and one end of described low pass filter connects video a/d change-over circuit, and the other end of described low pass filter connects one end of described electric capacity C2.
Video a/d change-over circuit, also known as video simulation digital quantizer or video A/D converter, is analog quantity or continually varying amount are carried out quantizing (discretization), is converted to the circuit of corresponding digital quantity.
Low pass filter allows that the signal lower than cut-off frequency passes through, but higher than cut-off frequency signal not by.The most general low pass filter is Butterworth filter and Chebyshev filter.
Preferably, the negative pole of described diode D2 also connects the supercircuit for realizing high impedance to analog video signal, described supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
The setting of described supercircuit is because for inductance L 2, during due to low frequency, the impedance of inductance coil is directly proportional to frequency.But when high frequency, due to the existence of inductance distributed capacitance, the impedance of whole inductance coil will diminish rapidly.That is the impedance of inductance coil first increases along with the increase of frequency, in time putting to SRF (self-resonant frequency), impedance reaches maximum, then impedance is just reduced to 0 rapidly, if frequency continues to raise again, inductance coil will go out capacitive.
When frequency is lower, particularly 1000Hz and following time, the impedance of inductance performance is inadequate, and like this when low-frequency range, signal receiving end decay is serious, can affect video quality.Triode is set to magnifying state by supercircuit, utilizes the characteristic of triode in amplification region and electric capacity C1 to show as low-impedance characteristic to AC signal, can realize the high impedance to analog video signal by adjustable resistance.
Fig. 3 is the circuit diagram according to the rear end analog video signal of the utility model the 3rd execution mode and the treatment circuit of power supply.
Preferably, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of the other end difference contact resistance R5 of described electric capacity C1, the other end of resistance R6, the negative pole of described diode D2.
Fig. 4 is the circuit diagram according to the rear end analog video signal of the utility model the 4th execution mode and the treatment circuit of power supply.
Preferably, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2 respectively, the other end of resistance R5, the other end of described resistance R6 connects the negative pole of described diode D2.
Fig. 5 is the circuit diagram according to the rear end analog video signal of the utility model the 5th execution mode and the treatment circuit of power supply.
Preferably, described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2, the other end of the other end difference contact resistance R6 of described resistance R5, the negative pole of described diode D2.
The operation principle of this supercircuit is: by the setting of external bias parameter, make triode Q3, triode Q4 is in amplification region, make pin 3 voltage of triode Q4 higher than pin one voltage, pin one voltage is higher than pin two voltage, such supply current, after triode Q3, triode Q4 amplify, flows to inductance L 2 by the pin 3 of triode Q4, pin two.But for analog video signal, because analog video signal belongs to AC signal, electric capacity C1 is Low ESR, utilize the characteristic (flow through the pin one of triode, the electric current of pin two determine the electric current that flow through pin 3, pin two) of triode in amplification region and the high impedance of resistance R5, make to flow through triode Q3, triode Q4 electric current minimum, negligible, the impedance that analog video signal is being experienced through this supercircuit approximates R4.The object to analog video signal high impedance can be realized by the resistance arranging resistance R4.Resistance R4 is K level resistance.
Fig. 6 is the circuit diagram according to the rear end analog video signal of the utility model the 6th execution mode and the treatment circuit of power supply.
Preferably, described supercircuit comprises electric capacity C21, resistance R21, resistance R23, resistance R24, triode Q21, triode Q22 and resistance R22, one end of described electric capacity C21 connects power input respectively, one end of resistance R21, one end of resistance R23, one end of resistance R24, the other end of the other end difference contact resistance R21 of described electric capacity C21, the base stage of triode Q21, one end of resistance R22, the other end of the emitter difference contact resistance R23 of described triode Q21, the base stage of triode Q22, the other end of the emitter contact resistance R24 of described triode Q22, the collector electrode of the other end difference connecting triode Q21 of described resistance R22, the collector electrode of triode Q22, the negative pole of described diode D2.
The impedance that analog video signal is being experienced through this supercircuit approximates R22.The object to analog video signal high impedance can be realized by the resistance arranging resistance R22.Resistance R22 is K level resistance.
Preferably, the negative pole of described diode D2 also connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, the negative pole of described diode D2.
The output current of current foldback circuit Real-Time Monitoring supply module, when output current is excessive, can the input of powered-down in time, protect the safety of whole Circuits System.
Fig. 7 is the circuit diagram according to the rear end analog video signal of the utility model the 7th execution mode and the treatment circuit of power supply.
Wherein, one end of described supercircuit connects the negative pole of described diode D2, the other end of described supercircuit connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, described supercircuit.
VCC is a DC power supply, after powering on, due to adjustable precision pressurizer D1 end conducting, the pin one voltage of triode Q1 is higher than pin two voltage, triode Q1 conducting, the pin two of triode Q1 is about high voltage VCC, is greater than triode Q2 pin 3 voltage, the complete conducting of triode Q2, starts supplying power for outside.
When the electric current flowing through resistance R3 exceedes certain value, the voltage at resistance R3 two ends raises, when resistance R3 both end voltage exceedes certain value, adjustable precision pressurizer D1 conducting, the pin one voltage of triode Q1 is lower than pin two voltage, and triode Q1 ends, triode Q2 ends, and VCC stops power supply.
Fig. 8 is the circuit diagram according to the rear end analog video signal of the utility model the 8th execution mode and the treatment circuit of power supply.
Wherein, the power input of described current foldback circuit also connects lc circuit; described lc circuit comprises inductance L 1 and electric capacity C3; one end of described inductance L 1 connects power input; the other end of described inductance L 1 connects one end of electric capacity C3, the power input of described current foldback circuit, the other end ground connection of described electric capacity C3 respectively.
VCC is a DC power supply, and inductance L 1 and electric capacity C3 form a lc circuit, realize power supply and slowly go up Electricity Functional.
Fig. 9 is the circuit diagram according to the front end analogue vision signal of the utility model the 9th execution mode and the treatment circuit of power supply.The treatment circuit of this front end can be applicable to communication front-end equipment place, as the video source collecting device in supervisory control system, comprises camera and video camera.
The treatment circuit of described a kind of front end analogue vision signal and DC power supply, to comprise for isolated DC power supply and by the second analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the second DC power supply of DC power supply, described second analog video signal comprises electric capacity C11 by circuit, described second DC power supply comprises diode D11 and inductance L 3 by circuit, one end of described electric capacity C11 connects the second vision signal end, the other end of described electric capacity C11 connects one end of inductance L 3 respectively, the negative pole of diode D11, the other end of described inductance L 3 is all connected power input with the positive pole of diode D11.
The treatment circuit of this front end and outside coaxial line are electrically connected, when the treatment circuit access DC power supply of front end, DC power supply experiences 0 impedance on the circuit that both diode D11 and inductance L 3 are in parallel, and DC power supply can directly export from the interface of coaxial line.Meanwhile, electric capacity C11 is high impedance concerning DC power supply, so DC power supply can be separated with the analog video signal of output by electric capacity C11, the input of DC power supply can not have influence on the output of analog video signal.When the treatment circuit transportation simulator vision signal of front end, because analog video signal is AC signal, and the impedance of electric capacity C11 is lower, and so for AC signal, what experience is Low ESR.And both diode D11 and inductance L 3 circuit in parallel belongs to high impedance for analog video signal.So, analog video signal and DC power supply isolated, analog video signal can be added in DC power supply, mutually unaffected, be not mutually exclusive, realize function simulation HD video line superposing DC power supply.Visible, the treatment circuit of this front end and coaxial line are electrically connected, coaxial line just can be allowed simultaneously to transmit DC power supply and analog video signal, not only cost-saving, and shorten the engineering time.
Particularly, the negative pole of described diode D11 also connects the second match circuit, and described second match circuit is source match circuit, and described source match circuit comprises Dai Weinan source match circuit and RC source match circuit.
Wherein, the positive pole of described diode D11 also connects the second supercircuit for realizing high impedance to analog video signal, described second supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
Preferably, described second supercircuit comprises resistance R11, triode Q8, resistance R10, triode Q7, electric capacity C9 and resistance R9, one end of described resistance R11 connects power output end respectively, one end of resistance R10, one end of electric capacity C9, the emitter of the other end connecting triode Q8 of described resistance R11, the base stage of the other end difference connecting triode Q8 of described resistance R10, the emitter of triode Q7, the base stage of the other end difference connecting triode Q7 of described electric capacity C9, one end of resistance R9, the collector electrode of the other end difference connecting triode Q8 of described resistance R9, the collector electrode of triode Q7, the positive pole of described diode D11.
Front end analogue vision signal is substantially identical with the treatment circuit operation principle of DC power supply with above-mentioned rear end analog video signal with the operation principle of the treatment circuit of DC power supply.In the supercircuit be made up of resistance R11, triode Q8, resistance R10, triode Q7, electric capacity C9 and resistance R9, equally triode Q7, triode Q8 are set to amplification region.Electric capacity C9 is Low ESR for analog video signal, like this due to the characteristic of triode in amplification region and the existence of R10 (high value), minimum by the electric current of triode Q7, triode Q8, can ignore, the impedance of this circuit to analog video signal approximates R9, can realize the object to analog video signal high impedance by the resistance arranging R9.Resistance R9 is also K level resistance.
The treatment circuit of front end analogue vision signal and DC power supply is a part for camera terminal circuit, and the treatment circuit of rear end analog video signal and DC power supply is a part for DVR terminal circuit.DC power supply is from the treatment circuit of DVR terminal circuit by above-mentioned rear end analog video signal and DC power supply, to coaxial line an interface (as, BNC1 interface, hereafter for BNC1), arrive after coaxial line coaxial line another interface (as, BNC2 interface, hereafter for BNC1), the signal exported from BNC2 interface through the treatment circuit of front end analogue vision signal and DC power supply to the camera terminal circuit of receiving end.Analog video signal brings out from camera, after for the electric capacity C11 of isolated DC power supply, by BNC2 interface, the coaxial line of coaxial line, to the BNC1 interface of coaxial line, again through isolating with DC power supply, filtering, coupling waits until video a/d change-over circuit, accomplishes that video and power supply are superimposed upon on a coaxial line.
Figure 10 is the block diagram of the supply power coaxially circuit of analog video signal according to the utility model the tenth execution mode.
The supply power coaxially circuit of described a kind of analog video signal, comprise coaxial line, one end (optional BNC1 end) of described coaxial line connects the treatment circuit of above-mentioned rear end analog video signal and DC power supply, and the other end (optional BNC2 end) of described coaxial line connects the treatment circuit of above-mentioned front end analogue vision signal and DC power supply.The treatment circuit of rear end analog video signal and DC power supply and the treatment circuit of front end analogue vision signal and DC power supply, see previous embodiment, no longer specifically describe herein.
In monitoring product system, DVR (DigitalVideoRecorder, DVR, digital video recorder) is long-term in occupation of main force position.But compared with the function can realize powering by a POE interface netting twine with NVR (Network Video Recorder, network hard disk video recorder), communicating, DVR is when connecting video camera or camera, need to power separately to video camera or camera, connect up very inconvenient.
Supply power coaxially (POC, Power Over Coaxia) is the technology of a kind of video based on coaxial line, coaxially control and power supply superposition.
The utility model make use of DC power supply and the difference of analog video signal in spectral range, can transmit power supply, analog video signal and other signals by a coaxial line.While adopting coaxial technical transmission analog video signal, recycle it and transmit power supply and data simultaneously, this not only can save considerable cost, can also shorten the engineering time.This technology superposed with signal by power supply, simple economy, effectively, has good utilization prospect in the product, engineering of reality.
Above-mentioned various circuit, those skilled in the art can also, 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 the treatment circuit of a kind of rear end analog video signal and DC power supply, front end analogue vision signal and the treatment circuit of DC power supply and the supply power coaxially circuit of analog video signal; the treatment circuit of the treatment circuit of this rear end and front end is electrically connected with the two ends of coaxial line respectively; coaxial line just can be allowed to transmit DC power supply and analog video signal simultaneously; not only cost-saving, and shorten the engineering time.
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. the treatment circuit of a rear end analog video signal and DC power supply, it is characterized in that: to comprise for isolated DC power supply and by the analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the DC power supply of DC power supply, described analog video signal comprises electric capacity C2 by circuit, described DC power supply comprises diode D2 and inductance L 2 by circuit, one end of described electric capacity C2 connects vision signal end, the other end of described electric capacity C2 connects one end of inductance L 2 respectively, the positive pole of diode D2, the other end of described inductance L 2 is all connected power input with the negative pole of diode D2.
2. treatment circuit according to claim 1, is characterized in that: the positive pole also matching connection circuit of described diode D2, and described match circuit is termination matching circuit, described termination matching circuit comprise wear dimension the south connect match circuit and RC termination matching circuit.
3. treatment circuit according to claim 1, it is characterized in that: described vision signal end also connects video processing circuits, described video processing circuits comprises video a/d change-over circuit and low pass filter, one end of described low pass filter connects video a/d change-over circuit, and the other end of described low pass filter connects one end of described electric capacity C2.
4. treatment circuit according to claim 1, it is characterized in that: the negative pole of described diode D2 also connects the supercircuit for realizing high impedance to analog video signal, described supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
5. treatment circuit according to claim 4, it is characterized in that: described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of the other end difference contact resistance R5 of described electric capacity C1, the other end of resistance R6, the negative pole of described diode D2.
6. treatment circuit according to claim 4, it is characterized in that: described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2 respectively, the other end of resistance R5, the other end of described resistance R6 connects the negative pole of described diode D2.
7. treatment circuit according to claim 4, it is characterized in that: described supercircuit comprises resistance R4, electric capacity C1, triode Q3, resistance R5, triode Q4 and resistance R6, one end of described resistance R4 connects power input respectively, the collector electrode of triode Q3, the collector electrode of triode Q4, the other end of described resistance R4 connects one end of electric capacity C1 respectively, the base stage of triode Q3, one end of the emitter difference contact resistance R5 of described triode Q3, the base stage of triode Q4, one end of the emitter contact resistance R6 of described triode Q4, the other end of described electric capacity C1 connects the positive pole of described diode D2, the other end of the other end difference contact resistance R6 of described resistance R5, the negative pole of described diode D2.
8. treatment circuit according to claim 4, it is characterized in that: described supercircuit comprises electric capacity C21, resistance R21, resistance R23, resistance R24, triode Q21, triode Q22 and resistance R22, one end of described electric capacity C21 connects power input respectively, one end of resistance R21, one end of resistance R23, one end of resistance R24, the other end of the other end difference contact resistance R21 of described electric capacity C21, the base stage of triode Q21, one end of resistance R22, the other end of the emitter difference contact resistance R23 of described triode Q21, the base stage of triode Q22, the other end of the emitter contact resistance R24 of described triode Q22, the collector electrode of the other end difference connecting triode Q21 of described resistance R22, the collector electrode of triode Q22, the negative pole of described diode D2.
9. treatment circuit according to claim 1, it is characterized in that: the negative pole of described diode D2 also connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, the negative pole of described diode D2.
10. treatment circuit according to claim 4, it is characterized in that: one end of described supercircuit connects the negative pole of described diode D2, the other end of described supercircuit connects current foldback circuit, described current foldback circuit comprises resistance R1, triode Q1, triode Q2, resistance R2, adjustable precision pressurizer D1 and resistance R3, one end of described resistance R1 connects power input respectively, the collector electrode of triode Q1, the collector electrode of triode Q2, the base stage of the emitter difference connecting triode Q2 of described triode Q1, one end of resistance R2, the other end of the emitter difference contact resistance R2 of described triode Q2, the adjustment end of adjustable precision pressurizer D1, one end of resistance R3, the base stage of the other end difference connecting triode Q1 of described resistance R1, the input of adjustable precision pressurizer D1, the other end of the output difference contact resistance R3 of described adjustable precision pressurizer D1, described supercircuit.
11. treatment circuits according to claim 9 or 10; it is characterized in that: the power input of described current foldback circuit also connects lc circuit; described lc circuit comprises inductance L 1 and electric capacity C3; one end of described inductance L 1 connects power input; the other end of described inductance L 1 connects one end of electric capacity C3, the power input of described current foldback circuit, the other end ground connection of described electric capacity C3 respectively.
The treatment circuit of 12. 1 kinds of front end analogue vision signals and DC power supply, it is characterized in that: to comprise for isolated DC power supply and by the second analog video signal of analog video signal by circuit with for isolating analog video signal and passing through circuit by the second DC power supply of DC power supply, described second analog video signal comprises electric capacity C11 by circuit, described second DC power supply comprises diode D11 and inductance L 3 by circuit, one end of described electric capacity C11 connects the second vision signal end, the other end of described electric capacity C11 connects one end of inductance L 3 respectively, the negative pole of diode D11, the other end of described inductance L 3 is all connected power input with the positive pole of diode D11.
13. treatment circuits according to claim 12, it is characterized in that: the negative pole of described diode D11 also connects the second match circuit, described second match circuit is source match circuit, and described source match circuit comprises Dai Weinan source match circuit and RC source match circuit.
14. treatment circuits according to claim 12, it is characterized in that: the positive pole of described diode D11 also connects the second supercircuit for realizing high impedance to analog video signal, described second supercircuit comprises electric capacity, triode and resistance, when triode is in magnifying state, electric capacity is utilized to present low-impedance characteristic to AC signal, select the resistance of different resistance, to realize the high impedance to analog video signal.
15. treatment circuits according to claim 14, it is characterized in that: described second supercircuit comprises resistance R11, triode Q8, resistance R10, triode Q7, electric capacity C9 and resistance R9, one end of described resistance R11 connects power output end respectively, one end of resistance R10, one end of electric capacity C9, the emitter of the other end connecting triode Q8 of described resistance R11, the base stage of the other end difference connecting triode Q8 of described resistance R10, the emitter of triode Q7, the base stage of the other end difference connecting triode Q7 of described electric capacity C9, one end of resistance R9, the collector electrode of the other end difference connecting triode Q8 of described resistance R9, the collector electrode of triode Q7, the positive pole of described diode D11.
The supply power coaxially circuit of 16. 1 kinds of analog video signals, it is characterized in that: comprise coaxial line, the rear end analog video signal of one end connection as described in claim 1 to 11 any one of described coaxial line and the treatment circuit of DC power supply, the front end analogue vision signal of other end connection as described in claim 12 to 15 any one of described coaxial line and the treatment circuit of DC power supply.
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| CN201520090832.7U CN204465724U (en) | 2015-02-09 | 2015-02-09 | The treatment circuit of a kind of rear end, front end and supply power coaxially circuit |
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| CN201520090832.7U CN204465724U (en) | 2015-02-09 | 2015-02-09 | The treatment circuit of a kind of rear end, front end and supply power coaxially circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106713866A (en) * | 2016-12-28 | 2017-05-24 | 浙江大华技术股份有限公司 | Analog video signal transmission device and transmission method thereof |
| CN108243324A (en) * | 2016-12-23 | 2018-07-03 | 杭州海康威视数字技术股份有限公司 | A kind of video monitoring system |
| CN108391054A (en) * | 2018-03-23 | 2018-08-10 | 杭州韬视科技有限公司 | It is a kind of based on coaxial rear front end for power receiving circuit |
| 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 |
| CN113176492A (en) * | 2021-03-10 | 2021-07-27 | 深圳市豪恩汽车电子装备股份有限公司 | Method for measuring scattering parameters of POC circuit |
| CN113411534A (en) * | 2021-06-15 | 2021-09-17 | 杭州海康机器人技术有限公司 | Power supply input and output device and video transmission system |
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2015
- 2015-02-09 CN CN201520090832.7U patent/CN204465724U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108243324A (en) * | 2016-12-23 | 2018-07-03 | 杭州海康威视数字技术股份有限公司 | A kind of video monitoring system |
| CN106713866A (en) * | 2016-12-28 | 2017-05-24 | 浙江大华技术股份有限公司 | Analog video signal transmission device and transmission method thereof |
| CN108391054A (en) * | 2018-03-23 | 2018-08-10 | 杭州韬视科技有限公司 | It is a kind of based on coaxial rear front end for power receiving circuit |
| 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 |
| CN113176492A (en) * | 2021-03-10 | 2021-07-27 | 深圳市豪恩汽车电子装备股份有限公司 | Method for measuring scattering parameters of POC circuit |
| CN113176492B (en) * | 2021-03-10 | 2023-12-12 | 深圳市豪恩汽车电子装备股份有限公司 | POC circuit scattering parameter measurement method |
| CN113411534A (en) * | 2021-06-15 | 2021-09-17 | 杭州海康机器人技术有限公司 | Power supply input and output device and video transmission system |
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