CN107333085B - A kind of power supply unit and power supply system - Google Patents

A kind of power supply unit and power supply system Download PDF

Info

Publication number
CN107333085B
CN107333085B CN201710701636.2A CN201710701636A CN107333085B CN 107333085 B CN107333085 B CN 107333085B CN 201710701636 A CN201710701636 A CN 201710701636A CN 107333085 B CN107333085 B CN 107333085B
Authority
CN
China
Prior art keywords
power supply
receiving equipment
power receiving
unit
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710701636.2A
Other languages
Chinese (zh)
Other versions
CN107333085A (en
Inventor
何宇翔
朱奇峰
许兴玉
邓志吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Dahua Technology Co Ltd
Original Assignee
Zhejiang Dahua Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Dahua Technology Co Ltd filed Critical Zhejiang Dahua Technology Co Ltd
Priority to CN201710701636.2A priority Critical patent/CN107333085B/en
Publication of CN107333085A publication Critical patent/CN107333085A/en
Priority to PCT/CN2017/119762 priority patent/WO2018233268A1/en
Priority to EP17914749.1A priority patent/EP3635948A1/en
Application granted granted Critical
Publication of CN107333085B publication Critical patent/CN107333085B/en
Priority to US16/708,487 priority patent/US11196408B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers

Abstract

The invention discloses a kind of power supply unit and power supply system, the power supply unit includes power input, recognition unit, processing unit, switch unit and external interface；Recognition unit determines the rising duration of power receiving equipment partial pressure value, sends processing unit for the rising duration for obtaining the partial pressure value of power receiving equipment in real time；Processing unit judges to rise duration whether in the time span of setting, if so, being determined as POC equipment, the power input is powered by the switch unit to the power receiving equipment；It is not power receiving equipment power supply if not, being determined as non-POC equipment.Difference in embodiments of the present invention according to the rising duration of the voltage value of POC equipment and non-POC equipment is larger, when being in non-power supply state, power supply unit obtains the partial pressure value of power receiving equipment in real time, it determines and rises duration, so that it is determined that the type of power receiving equipment, avoids the problem of power receiving equipment caused by the type confirmation mistake of POC equipment is burnt.

Description

A kind of power supply unit and power supply system
Technical field
The present invention relates to supply power coaxially technical field more particularly to a kind of power supply unit and power supply systems.
Background technique
In the current market in visible Analogvideotransmission system, there is a kind of supply power coaxially (Power Over Coaxial, POC) transmission plan includes feeder ear and receiving end in the program, program particular content is by power receiving equipment institute It needs power supply to be coupled in same coaxial line with analog video signal to transmit, its object is to reduce primary wiring or secondary wiring The construction cost of generation, power receiving equipment can be worked normally without external adapter.In POC transmission plan, to power receiving equipment It whether is that POC equipment has compared with strict requirements.When power receiving equipment is POC equipment, power supply unit can be normal for power receiving equipment Power supply, but when power receiving equipment is non-POC equipment, power supply unit is that power receiving equipment will when powering in POC transmission plan Burn power receiving equipment.Therefore, determine whether power receiving equipment is that POC equipment is most important in POC transmission plan.
It in the prior art include switch in power supply unit, before for power receiving equipment power supply, switch is in an off state, this When detect power receiving equipment type.Specifically, determining the type of power receiving equipment by featured resistance method, this method is set according to by electricity The partial pressure value of standby featured resistance determines the type of power receiving equipment.When power receiving equipment featured resistance partial pressure value in preset range When interior, it is determined that the power receiving equipment is POC equipment, and then controls closing the switch in power supply unit, is powered for the power receiving equipment, Otherwise it determines that the power receiving equipment is non-POC equipment, controls the switch in the power supply unit and keep off-state, be not this Power receiving equipment power supply.But the non-POC equipment having is close with the featured resistance of POC equipment, at this moment will miss non-POC equipment POC equipment is considered, if controlling closing the switch in power supply unit at this time, for power receiving equipment power supply, it will cause by electricity Equipment burnout.
Summary of the invention
The embodiment of the invention provides a kind of power supply unit and power supply system, to solve in the prior art due to determine by The problem of electric equipment type inaccuracy causes power receiving equipment to burn.
The embodiment of the invention provides a kind of power supply unit, the power supply unit includes power input, recognition unit, place Manage unit, switch unit and external interface；Wherein,
The recognition unit is connect with the external interface and the processing unit respectively, and the external interface is for connecting Power receiving equipment；The recognition unit is used to the partial pressure value of power receiving equipment is obtained in real time, when described point when being in non-power supply state Pressure value be preset first partial pressure value when, determine that power receiving equipment is connect with the external interface, and will current time as first Moment；By the partial pressure value be preset second partial pressure value at the time of be determined as the second moment；According to first moment and Two moment determined the rising duration of power receiving equipment partial pressure value, sent processing unit for the rising duration；
The processing unit is connect with the recognition unit and the switch unit respectively, the power input with it is described Switch unit connection, the switch unit connect external interface；The processing unit, for receiving the rising of recognition unit transmission Duration judges the rising duration whether in the time span of setting, if so, determine that the power receiving equipment is POC equipment, The switch unit closure is controlled, the power input is powered by the switch unit to the power receiving equipment；If not, It determines that the power receiving equipment is non-POC equipment, controls the switch unit and disconnect, be not power receiving equipment power supply.
Further, the power supply unit further include: power supply processing unit, video processing unit and video receiver；
The power supply processing unit is connect with the power input and the switch unit respectively, for working as switch unit When closure, block the video signal transmission of the power receiving equipment transmission to power input；
The video processing unit is connect with the video receiver and the external interface respectively, for receive it is described by The vision signal that electric equipment is sent, and processing is compensated to the vision signal, the vision signal after compensation deals is sent To the video receiver.
Further, the power supply processing unit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th Resistance, first capacitor, the first triode, the second triode, inductance and magnetic bead；
One end of first resistor is connect with power input, and one end of second resistance connects the first resistor and power supply is defeated Enter the concatenation point at end, the other end of second resistance is connect with the emitter of the first triode；First resistor not with power input One end of connection is connect with one end of the emitter of the second triode and the 4th resistance respectively；Described in one end connection of first capacitor First resistor concatenates a little with power input, the other end respectively with 3rd resistor, the base stage of the first triode and the two or three pole The base stage of pipe connects；
The collector of the collector of one end, the first triode that 3rd resistor is not connect with first capacitor, the second triode It is connect respectively with one end of magnetic bead with one end that the 4th resistance is not connect with first resistor；The other end of magnetic bead respectively with inductance and The connection of 5th resistance；One end that inductance and the 5th resistance are not connect with magnetic bead is connect with the switch unit.
Further, the power supply unit further include: surge detection unit；
The surge detection unit is connect with the video processing unit and the external interface respectively, the surge detection Unit, the vision signal for sending to the power receiving equipment carry out low-pass filtering treatment, the view after detecting low-pass filtering treatment The voltage value of frequency signal judges the voltage value whether in preset range of voltage values, if not, single to video processing Member sends control signal；
The video processing unit is also used to filter out when receiving the control signal that the surge detection unit is sent The voltage value not vision signal in preset range of voltage values in the vision signal, and the vision signal after filtering out is carried out The vision signal after compensation deals is sent video receiver by compensation deals.
Further, the video processing unit is also used to extract the coaxial countercharge signal that the video receiver is sent, And processing is overlapped to the coaxial countercharge signal, the coaxial countercharge signal after superposition processing is sent out by the external interface It is sent to power receiving equipment.
Further, the power supply unit further include: protection location；
The protection location is connect with switch unit, processing unit and external interface respectively, for judging itself electric current Whether value is in preset current range, if not, sending cut-off signal to the processing unit；
The processing unit after being also used to receive the cut-off signal, controls the switch unit and disconnects.
On the other hand, the embodiment of the invention provides a kind of power supply system, the system comprises power receiving equipments and described Power supply unit；Wherein,
The power supply unit is connect with power receiving equipment, for obtaining power receiving equipment in real time when being in non-power supply state Partial pressure value determines that power receiving equipment is connect with the external interface, and will work as when the partial pressure value is preset first partial pressure value The preceding moment is as the first moment；By the partial pressure value be preset second partial pressure value at the time of be determined as the second moment；According to institute The first moment and the second moment are stated, determines the rising duration of power receiving equipment partial pressure value, judges whether the rising duration is setting Time span in, if so, determining that the power receiving equipment is POC equipment, the power supply of Xiang Suoshu power receiving equipment；If not, determining The power receiving equipment is non-POC equipment, is not power receiving equipment power supply.
Further, the power receiving equipment believes the video after isolation processing for carrying out isolation processing to vision signal Number it is sent to the power supply unit.
Further, the power supply unit is also used to extract coaxial countercharge signal, and carries out to the coaxial countercharge signal The coaxial countercharge signal after superposition processing is sent power receiving equipment by superposition processing；
The power receiving equipment is also used to adjust the bias voltage of itself, according to the bias voltage adjusted and reception The coaxial countercharge signal arrived determines that target is coaxially countercharged signal, and signal of coaxially being countercharged according to target executes corresponding function.
Further, the power receiving equipment makes itself repid discharge when being also used to identify that itself and power supply unit disconnect.
Further, the power receiving equipment includes the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the three or three pole Pipe, the 4th triode and the second capacitor；
One end of 6th resistance is connect with power supply unit, and one end of the 8th resistance connects the 6th resistance and power supply unit Concatenation point, the other end of the 8th resistance connect with the base stage of the collector of third transistor and the 4th triode respectively；9th One end of resistance connects concatenating a little for the 6th resistance and power supply unit, and the other end is connect with the collector of the 4th triode； One end of second capacitor connects concatenating a little for the 6th resistance and power supply unit, other end ground connection；6th resistance not with power supply One end of equipment connection is connect with the base stage of the 7th resistance and third transistor respectively；What the 7th resistance was not connect with the 6th resistance One end ground connection；The emitter of the emitter of third transistor and the 4th triode ground connection.
The embodiment of the invention provides a kind of power supply unit and power supply system, the power supply unit include power input, Recognition unit, processing unit, switch unit and external interface；Wherein, the recognition unit respectively with the external interface and institute Processing unit connection is stated, the external interface is for connecting power receiving equipment；The recognition unit is used for when in non-power supply state When, the partial pressure value of power receiving equipment is obtained in real time, when the partial pressure value is preset first partial pressure value, determines power receiving equipment and institute State external interface connection, and will current time as the first moment；By the partial pressure value be preset second partial pressure value at the time of It was determined as the second moment；According to first moment and the second moment, the rising duration of power receiving equipment partial pressure value is determined, it will be described Rise duration and is sent to processing unit；The processing unit is connect with the recognition unit and the switch unit respectively, described Power input is connect with the switch unit, and the switch unit connects external interface；The processing unit is known for receiving The rising duration that other unit is sent, judge the risings duration whether in the time span of setting, if so, described in determination by Electric equipment is POC equipment, controls the switch unit closure, the power input is by the switch unit to described by electricity Equipment power supply；If not, determining that the power receiving equipment is non-POC equipment, controls the switch unit and disconnect, not to be described by electricity Equipment power supply.Difference in embodiments of the present invention according to the rising duration of the voltage value of POC equipment and non-POC equipment is larger, When being in non-power supply state, power supply unit can obtain the partial pressure value of power receiving equipment in real time, according to point of the power receiving equipment Pressure value can determine the rising duration of power receiving equipment partial pressure value, so that it is determined that the type of power receiving equipment, avoids POC equipment The problem of power receiving equipment caused by type confirmation mistake is burnt.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is the power supply unit structural schematic diagram that the embodiment of the present invention 1 provides；
Fig. 2 is the circuit diagram for the recognition unit that the embodiment of the present invention 1 provides；
Fig. 3 is the variation schematic diagram for the power receiving equipment partial pressure value that the embodiment of the present invention 1 provides；
Fig. 4 is the power supply unit structural schematic diagram that the embodiment of the present invention 2 provides；
Fig. 5 is the circuit diagram for the blocking vision signal that the embodiment of the present invention 2 provides；
Fig. 6 is the power supply unit structural schematic diagram that the embodiment of the present invention 3 provides；
Fig. 7 is the video processing unit structural schematic diagram that the embodiment of the present invention 3 provides；
Fig. 8 be the embodiment of the present invention 3 provide judge whether there is the biggish vision signal of voltage magnitude and filter out electricity The circuit diagram of the biggish vision signal of pressure amplitude value；
Fig. 9 A is vision signal signal when not filtering out the biggish vision signal of voltage magnitude that the embodiment of the present invention 3 provides Figure；
Fig. 9 B is the vision signal signal filtered out after the biggish vision signal of voltage magnitude that the embodiment of the present invention 3 provides Figure；
Figure 10 is the video processing unit structural schematic diagram that the embodiment of the present invention 4 provides；
Figure 11 is that the extraction that provides of the embodiment of the present invention 4 is coaxially countercharged signal, and is overlapped place to coaxial countercharge signal The circuit diagram of reason；
Figure 12 is the power supply unit structural schematic diagram that the embodiment of the present invention 5 provides；
Figure 13 is the current foldback circuit figure that the embodiment of the present invention 5 provides；
Figure 14 is that the power receiving equipment that the embodiment of the present invention 5 provides extracts protection circuit diagram；
Figure 15 is the power supply system structural schematic diagram that the embodiment of the present invention 6 provides；
Figure 16 is the power receiving equipment structural schematic diagram that the embodiment of the present invention 7 provides；
Figure 17 is the power receiving equipment bias voltage schematic diagram before the adjustment that the embodiment of the present invention 8 provides；
Figure 18 is the power receiving equipment bias voltage schematic diagram adjusted that the embodiment of the present invention 8 provides；
Figure 19 is the realization quick discharging circuit figure that the embodiment of the present invention 9 provides.
Specific embodiment
The present invention will be describe below in further detail with reference to the accompanying drawings, it is clear that described embodiment is only this A part of embodiment is invented, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist All other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment 1:
Fig. 1 is a kind of power supply unit structural schematic diagram provided in an embodiment of the present invention, and the power supply unit includes that power supply is defeated Enter end 11, recognition unit 12, processing unit 13, switch unit 14 and external interface 15；Wherein,
The recognition unit 12 is connect with the external interface 15 and the processing unit 13 respectively, the external interface 15 For connecting power receiving equipment；The recognition unit 12 is used to obtain the partial pressure of power receiving equipment in real time when being in non-power supply state Value determines that power receiving equipment is connect with the external interface 15, and will be current when the partial pressure value is preset first partial pressure value Moment is as the first moment；By the partial pressure value be preset second partial pressure value at the time of be determined as the second moment；According to described First moment and the second moment determine the rising duration of power receiving equipment partial pressure value, send processing unit for the rising duration 13；
The processing unit 13 is connect with the recognition unit 12 and the switch unit 14 respectively, the power input 11 connect with the switch unit 14, and the switch unit 14 connects external interface 15；The processing unit 13 is known for receiving The rising duration that other unit 12 is sent judges the rising duration whether in the time span of setting, if so, described in determining Power receiving equipment is POC equipment, controls the switch unit 14 and is closed, the power input 11 by the switch unit 14 to The power receiving equipment power supply；If not, determining that the power receiving equipment is non-POC equipment, controls the switch unit 14 and disconnect, no For power receiving equipment power supply.
In embodiments of the present invention, recognition unit 12 is connect with external interface 15 and processing unit 13 respectively, described external Interface 15 be used for by coaxial cable connection power receiving equipment, switch unit 14 respectively with power input 11, processing unit 13 and External interface 15 connect, when switch unit 14 be closed when, power supply unit be in power supply state, if at this time external interface 15 and by Electric equipment connection, power input 11 can power for power receiving equipment.When the power receiving equipment connected in order to prevent is non-POC equipment Power receiving equipment is burnt, when judging power receiving equipment to be POC equipment being also non-POC equipment, needs switch unit 14 to disconnect, that is, exists Non- power supply state judges that power receiving equipment be POC equipment is also non-POC equipment.
When being in non-power supply state, recognition unit 12 can obtain the partial pressure value of power receiving equipment in real time.Wherein, identification is single Member 12 can be obtained when obtaining the partial pressure value of power receiving equipment according to software program, can also be by building the side of hardware circuit Formula is realized.When external interface 15 is not connected with power receiving equipment, recognition unit 12 cannot pass through external interface 15 and power receiving equipment Access is formed, it is a biggish voltage value that recognition unit 12, which obtains the partial pressure value of power receiving equipment, at this time, and works as external interface 15 When connecting power receiving equipment, recognition unit 12 forms access by external interface 15 and power receiving equipment, and recognition unit 12 obtains at this time The partial pressure value of power receiving equipment is a lesser voltage value, therefore preset first partial pressure value can be saved in recognition unit 12, First partial pressure value is the voltage value that can be indicated at the time of external interface 15 is connect with power receiving equipment, when recognition unit 12 obtains When the partial pressure value of the power receiving equipment taken is preset first partial pressure value, determine that power receiving equipment is connect with the external interface, and will Current time is as the first moment.
It include capacitor in power receiving equipment, after external interface 15 connects power receiving equipment, in certain time length, by electricity The partial pressure value of equipment is to increase.Preset second partial pressure value can be saved in recognition unit 12, second partial pressure value is greater than First partial pressure value, when the partial pressure value for the power receiving equipment that recognition unit 12 obtains is preset second partial pressure value, determination is worked as The preceding moment was the second moment.According to first moment and the second moment, the rising duration of power receiving equipment partial pressure value can be determined, Recognition unit 12 can send processing unit 13 for the rising duration.
Specifically, in embodiments of the present invention, recognition unit 12 can be obtained in real time by circuit diagram shown in Fig. 2 by electricity The partial pressure value of equipment.In the moment that external interface 15 is connect with power receiving equipment, the at this moment electricity of the 3.3V in circuit diagram shown in Fig. 2 Pressure is transferred to power receiving equipment by resistance R and diode D, can generate the very high step letter of a frequency in the moment of transmission Number, since the frequency of the step signal is very high, the impedance that the step signal is presented in the capacitor in power receiving equipment is 0, therefore, the moment that external interface 15 is connect with power receiving equipment, the partial pressure value for the power receiving equipment that recognition unit 12 obtains is 0.And In not connected power receiving equipment, since recognition unit 12 cannot form access with power receiving equipment, as shown in Fig. 2, obtain Partial pressure value is 3.3V.
Preset first partial pressure value saved in recognition unit 12 can be 0.When the power receiving equipment that recognition unit 12 obtains Partial pressure value be 0 when, determine that power receiving equipment is connect with the external interface 15, and will current time as the first moment.Identification Preset second partial pressure value is preserved in unit 12, second partial pressure value is greater than the first partial pressure value, and is less than recognition unit The voltage value of 12 outputs, for example, the voltage value that recognition unit 12 exports is 3.3V, preset second partial pressure value can be 2.2V, 2.3V etc..When the partial pressure value for the power receiving equipment that recognition unit 12 obtains is preset second partial pressure value, when determining current Carving was the second moment.Recognition unit 12 can determine the upper of power receiving equipment partial pressure value according to first moment and the second moment Duration is risen, and sends processing unit 13 for the rising duration.
The processing unit 13 can receive the rising duration of the transmission of recognition unit 12.Due to capacity ratio in non-POC equipment Smaller, therefore, if the power receiving equipment of connection is non-POC equipment, the partial pressure value of power receiving equipment is increased by the first partial pressure value Time to the second partial pressure value can be very short, substantially instantaneously completes, and capacitor is bigger in POC equipment, therefore, if even The power receiving equipment connect is POC equipment, then the partial pressure value of power receiving equipment is increased to the time of the second partial pressure value by the first partial pressure value The relatively non-POC equipment of meeting is longer.As shown in figure 3, the partial pressure value of non-POC equipment increases to the second partial pressure value by the first partial pressure value Time, t3 was very short, close to 0；Capacitor is that the partial pressure value of the POC equipment of 220uF increases to the second partial pressure value by the first partial pressure value Time t2 close to 0.1 second；Capacitor is that the partial pressure value of the POC equipment of 470uF increases to the second partial pressure value by the first partial pressure value Time t1 close to 0.2 second.
Therefore, the time span that setting can be saved in processing unit 13, in the rising for receiving the transmission of recognition unit 12 After duration, the rising duration is judged whether in the time span of setting, if it is, determining that the power receiving equipment is POC Otherwise equipment determines that the power receiving equipment is non-POC equipment.The time span of the setting for example can be 0.08 second to 0.22 Second.
If it is determined that the power receiving equipment is POC equipment, the power receiving equipment will not be burnt for power receiving equipment power supply, Therefore, processing unit 13 can send closure signal to switch unit 14, control the switch unit 14 and be closed, the power supply is defeated Enter end 11 and is powered by the switch unit 14 to the power receiving equipment.If it is determined that the power receiving equipment is non-POC equipment, place Cut-off signal can be sent to switch unit 14 by managing unit 13, controlled the switch unit 14 and disconnected, at this time the power input End 11 will not power to the power receiving equipment, therefore can be to avoid burning the power receiving equipment.
Since in embodiments of the present invention, when being in non-power supply state, the recognition unit can be obtained in real time by electricity The partial pressure value of equipment can determine the rising duration of power receiving equipment partial pressure value according to the partial pressure value of the power receiving equipment, will be described Rise duration and be sent to processing unit, the rise time difference of the voltage value of POC equipment and non-POC equipment is larger, described When processing unit judges that the rising duration is in the time span of setting, determine that the power receiving equipment is POC equipment, control is opened Unit closure is closed, it is single to control the switch otherwise, it determines the power receiving equipment is non-POC equipment for the power supply of Xiang Suoshu power receiving equipment Member disconnects.When so as to avoid non-POC equipment being mistakenly considered POC equipment, powers if it is the power receiving equipment, cause to be set by electricity Standby the problem of burning.
Embodiment 2:
On the basis of the above embodiments, in embodiments of the present invention, Fig. 4 is a kind of power supply provided in an embodiment of the present invention Device structure schematic diagram, the power supply unit further include: power supply processing unit 21, video processing unit 22 and video receiver 23；
The power supply processing unit 21 is connect with the power input 11 and the switch unit 14 respectively, is opened for working as When closing the closure of unit 14, block the video signal transmission of the power receiving equipment transmission to power input 11；
The video processing unit 22 is connect with the video receiver 23 and the external interface 15 respectively, for receiving The vision signal that the power receiving equipment is sent, and processing is compensated to the vision signal, the video after compensation deals is believed Number it is sent to the video receiver 23.
Power supply unit can be powered by power input 11 for power receiving equipment, and power receiving equipment can be sent to power supply unit Vision signal.In embodiments of the present invention, the power supply unit includes video receiver 23, for receiving power receiving equipment transmission Vision signal, in order to improve the quality for the vision signal that video receiver 23 receives, the power supply unit further includes at power supply Manage unit 21 and video processing unit 22.Power supply processing unit 21 respectively with the power input 11 and the switch unit 14 Connection, when the switch is closed, power input 11 are powered by power supply processing unit 21 to power receiving equipment, power supply processing unit 21 The video signal transmission that the power receiving equipment can also be blocked to send is to power input 11, to reduce declining for vision signal Subtract, makes video signal transmission to video receiver 23.
In addition, vision signal inevitably also has centainly during being transferred to video receiver 23 by power receiving equipment Decaying, the video processing unit 22 in order to guarantee the quality of vision signal that video receiver 23 receives, in power supply unit The vision signal that can be sent to power receiving equipment compensates processing, sends the video for the vision signal after compensation deals Receiving end 23.Wherein, the process for compensating processing to vision signal belongs to the prior art, does not go to live in the household of one's in-laws on getting married herein to this process It states.
In embodiments of the present invention, power supply processing unit 21 blocks the video signal transmission of the power receiving equipment transmission to electricity Source input terminal 11 can be realized by software, can also be realized by building hardware circuit.Fig. 5 is to block vision signal Circuit diagram, the power supply processing unit 21 include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th Resistance R5, first capacitor C1, the first triode Q1, the second triode Q2, inductance L and magnetic bead FB；
One end of first resistor R1 is connect with power input, one end of second resistance R2 connect the first resistor R1 with The concatenation point of power input, the other end of second resistance R2 are connect with the emitter of the first triode Q1；First resistor R1 is not The one end connecting with power input is connect with one end of the emitter of the second triode Q2 and the 4th resistance R4 respectively；First electricity The one end for holding C1 connects concatenating a little for the first resistor R1 and power input, the other end respectively with 3rd resistor R3, first The base stage of triode Q1 is connected with the base stage of the second triode Q2；
The collector, the second triode Q2 of one end, the first triode Q1 that 3rd resistor R3 is not connect with first capacitor C1 Collector and the one end that is not connect with first resistor R1 the 4th resistance R4 connect respectively with one end of magnetic bead FB；Magnetic bead FB's is another One end is connect with inductance L and the 5th resistance R5 respectively；It is opened with described one end that inductance L and the 5th resistance R5 are not connect with magnetic bead FB Unit 14 is closed to connect.
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first electricity in circuit diagram shown in fig. 5 Hold C1, the first triode Q1 and the second triode Q2 and plays low frequency signal buffer action.Specifically, due to the both ends first capacitor C1 Voltage can not be mutated, therefore can be between the base stage and emitter of the first triode of clamper Q1 by the charge and discharge of first capacitor C1 Voltage Vbe1 and the second triode Q2 base stage and emitter between voltage Vbe2, pass through control the first triode Q1 base Voltage Vbe1 between the pole and emitter and voltage Vbe2 between the base stage and emitter of the second triode Q2, i.e. controllable flow Cross the electric current between the electric current between the base stage and emitter of the first triode Q1 and the base stage and emitter of the second triode Q2.
Therefore, the low frequency signal in vision signal sent for power receiving equipment, first capacitor C1 can pass through 3rd resistor R3 carries out charge and discharge, at this time the base stage of the voltage Vbe1 between the base stage and emitter of the first triode Q1 and the second triode Q2 Voltage Vbe2 between emitter will change, therefore flow through the electricity between the base stage and emitter of the first triode Q1 Stream and the electric current between the base stage and emitter of the second triode Q2 will change, it can by controlling 3rd resistor R3 With the charge and discharge electrical time constant of first capacitor C1, to control the circuit to the response time of low frequency signal.Wherein, when third electricity When the resistance value of resistance R3 is bigger or first capacitor C1 is bigger, slower to the response time of low frequency signal, equivalent impedance is also bigger；When 3rd resistor R3 or first capacitor C1 get over hour, faster to the response time of low frequency signal, and equivalent impedance is also just smaller.Therefore, In embodiments of the present invention, 3rd resistor R3 or first capacitor C1 can be increased to increase equivalent impedance, and then play low frequency letter Number buffer action.
Inductance L and the 5th resistance R5 in circuit diagram shown in fig. 5 play medium-high frequency buffer action, by induction reactance formula: XL =2 π Lf, X in formulaLFor induction reactance, L is inductance, and f is frequency, it is known that the medium-high frequency in vision signal sent for power receiving equipment When signal, since frequency is higher, the induction reactance that inductance L shown in fig. 5 is generated is larger, and then plays high frequency signal isolation and make With.In addition, since circuit inductance L needs certain through-current capacity, while in order to which higher resistance inductance L is presented again to high frequency signal Biggish sensibility reciprocal is needed, this self-resonant frequency that will lead to inductance L becomes very low.Therefore, can by addition magnetic bead FB come Increase the isolated impedance of high-frequency signal.
Embodiment 3:
It when biggish power swing occurs for power receiving equipment, such as carries out cutting the operation such as infrared lamp, zoom zoom, be set by electricity Can there are vision signal of the voltage magnitude much higher than the voltage magnitude of normal video signal, Er Qie electricity in the vision signal that preparation is sent The frequency of the higher vision signal of pressure amplitude value is lower, the presence meeting of the higher vision signal of voltage magnitude so that power supply unit to view The identification of frequency signal goes wrong, and eventually leads to vision signal loss.In order to when power receiving equipment occur biggish power swing when, Guarantee the vision signal that identification receives, on the basis of the various embodiments described above, in embodiments of the present invention, Fig. 6 is this A kind of power supply unit structural schematic diagram that inventive embodiments provide, the power supply unit further include: surge detection unit 31；
The surge detection unit 31 is connect with the video processing unit 22 and the external interface 15 respectively, the wave Dynamic detection unit 31, the vision signal for sending to the power receiving equipment carry out low-pass filtering treatment, detect at low-pass filtering The voltage value of vision signal after reason judges the voltage value whether in preset range of voltage values, if not, to the view Frequency processing unit 22 sends control signal；
The video processing unit 22 is also used to when receiving the control signal that the surge detection unit 31 is sent, The voltage value not vision signal in preset range of voltage values is filtered out in the vision signal, and to the vision signal after filtering out Processing is compensated, sends video receiver 23 for the vision signal after compensation deals.
In embodiments of the present invention, when biggish power swing occurs for power receiving equipment, in order to guarantee that power supply unit can Identify the vision signal that receives, need to filter out due to the voltage magnitude that biggish power swing occurs for power receiving equipment and generates compared with Big vision signal.Before filtering out the biggish vision signal of voltage magnitude, need to judge in vision signal with the presence or absence of voltage The biggish vision signal of amplitude.Surge detection unit 31 in power supply unit is for judging in vision signal with the presence or absence of voltage amplitude It is worth biggish vision signal.
Specifically, surge detection unit 31 can receive the vision signal of power receiving equipment transmission, since voltage magnitude is larger Vision signal frequency it is lower, do not need to judge high frequency signal, therefore, surge detection unit 31 is to described by electricity The vision signal that equipment is sent carries out low-pass filtering treatment.Since the voltage magnitude of the biggish vision signal of voltage magnitude is much higher than The voltage magnitude of normal video signal, therefore the voltage of the voltage value of the biggish vision signal of voltage magnitude and normal video signal Value is different.Preset range of voltage values can be saved in surge detection unit 31, and low-pass filtering treatment is being carried out to vision signal Afterwards, whether the voltage value for detecting the vision signal after low-pass filtering treatment, judge the voltage value in preset range of voltage values It is interior, if it is, determine vision signal in be not present the biggish vision signal of voltage magnitude, video processing unit 22 directly to by The vision signal that electric equipment is sent compensates processing, and sends video receiver 23 for the vision signal after compensation deals. If it is determined that the voltage value is not in preset range of voltage values, it is determined that there are the biggish views of voltage magnitude in vision signal Frequency signal needs to filter out the biggish video letter of the amplitude to guarantee that power supply unit can identify the vision signal received Number, specifically, surge detection unit 31 after judging the voltage value not in preset range of voltage values, that is, determines video letter There are after the biggish vision signal of voltage magnitude in number, Xiang Suoshu video processing unit 22 sends control signal, described in control Video processing unit 22 filters out the biggish vision signal of voltage magnitude.
The video processing unit 22 filters out described when receiving the control signal that the surge detection unit 31 is sent The voltage value not vision signal in preset range of voltage values in vision signal filters out the biggish video letter of voltage magnitude Number, and processing is compensated to the vision signal after filtering out, video receiver 23 is sent by the vision signal after compensation deals. As shown in fig. 7, including fluctuation filtering subelement 221 and compensated video signal subelement 222, institute in the video processing unit 22 It states fluctuation filtering subelement 221 to connect with surge detection unit 31, the fluctuation filtering subelement 221 is receiving surge detection list After the control signal that member 31 is sent, the biggish vision signal of voltage magnitude is filtered out, and send view for the vision signal after filtering out Frequency signal compensation subelement 222, the compensated video signal subelement 222 are connect with video receiver 23, can be to filtering out after Vision signal compensate processing, and send video receiver 23 for the vision signal after compensation deals.
In embodiments of the present invention, it is judging whether there is the biggish vision signal of voltage magnitude and is filtering out voltage magnitude It when biggish vision signal, can be realized, can also be realized by building hardware circuit as shown in Figure 8 by software.
As shown in figure 8, the video signal transmission that power receiving equipment is sent is to surge detection unit 31 and fluctuation filtering subelement 221, the video driver U3 in surge detection unit 31 play isolation vision signal and filter the video letter of predetermined band Number effect, resistance and capacitor in surge detection unit 31 form low-pass filter circuit, carry out low-pass filtering to vision signal Processing.Vision signal after low-pass filtering treatment be separately input to comparator U4 positive input and comparator U5 negative sense it is defeated Enter end, the voltage value that the end VH provides is greater than the voltage value that the end VL provides.If the voltage value of the vision signal after low-pass filtering treatment The voltage value provided greater than VH, it is determined that there are the biggish vision signal of voltage magnitude in vision signal, comparator U4 output is high Level signal, comparator U5 export low level signal, then diode D3 conducting, diode D4 cut-off, at this time surge detection unit 31 high level signals exported to fluctuation filtering subelement 211 are to control signal.If the vision signal after low-pass filtering treatment Voltage value be less than VL provide voltage value, it is determined that there are the biggish vision signal of voltage magnitude, comparators in vision signal U4 exports low level signal, and comparator U5 exports high level signal, then diode D3 cut-off, diode D4 conducting, are fluctuated at this time The high level signal that detection unit 31 is exported to fluctuation filtering subelement 211 is to control signal.If after low-pass filtering treatment The voltage value of vision signal is greater than the voltage value that VL is provided, and is less than the voltage value that VH is provided, it is determined that in vision signal not There are the biggish vision signal of voltage magnitude, comparator U4 and U5 export low level signal diode D3 and D4 cut-off, fluctuation Detection unit 31 exports low level signal to fluctuation filtering subelement 211.
The control signal that surge detection unit 31 is sent to fluctuation filtering subelement 221 is high level signal, high level letter Metal-oxide-semiconductor M3 closure in number control fluctuation filtering subelement 221, at this time the resistance Rd and capacitor in fluctuation filtering subelement 221 Cd forms high-pass filter, and by adjusting resistance Rd and capacitor Cd, fluctuation filtering subelement 221 can filter out power receiving equipment hair The biggish vision signal of voltage magnitude in the vision signal sent.
When biggish power swing occurs for power receiving equipment, that is, when there is the biggish vision signal of voltage magnitude, filter out electricity Before the biggish vision signal of pressure amplitude value, the vision signal that power receiving equipment is sent is as shown in Figure 9 A, the video that power receiving equipment is sent In signal include normal vision signal and the biggish vision signal of voltage magnitude, filter out the biggish vision signal of voltage magnitude it Vision signal afterwards is as shown in Figure 9 B.
Due in embodiments of the present invention, when biggish power swing occurs for power receiving equipment, that is, exist voltage magnitude compared with When big vision signal, surge detection unit 31 can determine that there are the biggish vision signals of voltage magnitude, and to the view Frequency processing unit 22 sends control signal, controls the video processing unit 22 and filters out the biggish vision signal of voltage magnitude, institute It states after video processing unit 22 filters out the biggish vision signal of voltage magnitude, place is compensated to the vision signal after filtering out Reason, sends video receiver 23 for the vision signal after compensation deals, therefore, when biggish power swing occurs for power receiving equipment When, also guarantee that power supply unit can identify the vision signal received.
Embodiment 4:
On the basis of the various embodiments described above, in embodiments of the present invention, the video processing unit 22 is also used to extract The coaxial countercharge signal that the video receiver 23 is sent, and processing is overlapped to the coaxial countercharge signal, at superposition Coaxial countercharge signal after reason is sent to power receiving equipment by the external interface 15.
In embodiments of the present invention, the video receiver 23 can also send coaxial countercharge signal, institute to power receiving equipment The coaxial countercharge signal that the video receiver 23 is sent, as shown in Figure 10, the view can be extracted by stating video processing unit 22 It further include countercharge signal extraction subelement 223, the countercharge signal extraction subelement 223 and the video in frequency processing unit 22 Receiving end 23 connects, and the countercharge signal extraction subelement 223 can extract the coaxial countercharge that the video receiver 23 is sent Signal.The signal driving capability of general countercharge signal extraction subelement 223 is poor, in order to guarantee the coaxial countercharge signal extracted It can be transferred to power receiving equipment, as shown in Figure 10, in the video processing unit 22 further include countercharge Signal averaging subelement 224, countercharge Signal averaging subelement 224 is connected respectively at countercharge signal extraction subelement 223 and external interface 15, for anti- The coaxial countercharge Signal averaging processing that control signal extraction subelement 223 extracts, improves signal driving capability, and then by external The coaxial countercharge signal after superposition processing is sent power receiving equipment by interface 15.
In embodiments of the present invention, the coaxial countercharge signal that the video receiver 23 is sent is extracted, and to described coaxial When countercharge signal is overlapped processing, it can be realized by software, it can also be by building hardware circuit as shown in figure 11 To realize.
As shown in figure 11, coaxially countercharge signal is issued from video receiver 23, by countercharge signal coaxial after resistance Rs Voltage magnitude can because Rs partial pressure and reduce, as shown in figure 11, can by the voltage difference of two input terminals of comparator U1, The signal extraction that will coaxially countercharge comes out, after the RC low-pass filter formed by resistance and capacitor, the signal that will coaxially countercharge hair It is sent to the input terminal of comparator U2, comparator U2 by the way that coaxial countercharge signal to be compared with comparative level Vref, open by output OFF signal, switching signal are high level signal and low level signal.What switching signal can control metal-oxide-semiconductor M2 and M1 leads on-off It opens, wherein high level signal controls metal-oxide-semiconductor M2 and M1 conducting, and low level signal controls metal-oxide-semiconductor M2 and M1 and disconnects.Metal-oxide-semiconductor M2 is led After logical, coaxial countercharge signal can be superimposed upon external interface 15 by resistance Rc；Metal-oxide-semiconductor M1 conducting, can send power receiving equipment Vision signal by resistance draw to ground, prevent the coaxial countercharge signal at external buckle 15 from feeding back to video output terminals 23.Extremely This, can be completed the extraction of coaxial countercharge signal be superimposed.Wherein, the video reception is extracted by circuit diagram shown in Figure 11 The coaxial countercharge signal that end 23 is sent, and the process for being overlapped processing to the coaxial countercharge signal belongs to the prior art, This does not repeat this process.
Embodiment 5:
On the basis of the various embodiments described above, in embodiments of the present invention, Figure 12 is one kind provided in an embodiment of the present invention Power supply unit structural schematic diagram, the power supply unit further include: protection location 41；
The protection location 41 is connect with switch unit 14, processing unit 13 and external interface 15 respectively, for judging certainly Whether the current value of body is in preset current range, if not, sending cut-off signal to the processing unit 13；
The processing unit 13 after being also used to receive the cut-off signal, controls the switch unit 14 and disconnects.
Power supply unit to power receiving equipment during powering, it is possible to the feelings that overcurrent condition or power receiving equipment are extracted occurs Condition, if there is overcurrent condition, power supply unit is still in power supply state, it is likely that burn component in power supply unit or Power receiving equipment is burnt, if after power receiving equipment is extracted, power supply unit will appear at the external interface 15 still in power supply state High pressure, when power receiving equipment is again coupled to, it is understood that there may be the problem of connecting with power receiving equipment can not be recognized.
In embodiments of the present invention, it in order to avoid burning the component in power supply unit or burning power receiving equipment, avoids When power receiving equipment is again coupled to, occur that possibly the problem of connecting with power receiving equipment can not be recognized, the power supply unit also wraps Include protection location 41.The protection location 41 can detecte the case where overcurrent condition or power receiving equipment extraction whether occur.
Specifically, the current value of protection location 41 itself is excessive when due to overcurrent condition occur, there is power receiving equipment extraction The case where when, the current value of protection location 41 itself is 0, the current value of protection location 41 itself under both abnormal conditions, with The current value of protection location 41 itself is different when power supply unit is power receiving equipment normal power supply, therefore, in protection location 41 can be with Save preset current range, protection location 41 judge the current value of itself whether in preset current range, if it is, Illustrate that power supply unit is power receiving equipment normal power supply；If it is not, then illustrating abnormal conditions occur, Xiang Suoshu processing unit 13 is sent Cut-off signal.After processing unit 13 receives the cut-off signal, cut-off signal is sent to switch unit 14, controls the switch Unit 14 disconnects.So that power supply unit is in non-power supply state, avoiding may burn in power supply unit when there is overcurrent condition Component or the problem of burn power receiving equipment, and avoid when power receiving equipment is again coupled to, occur possibly not identifying To the problem of connection with power receiving equipment.
In embodiments of the present invention, software can be passed through by sending cut-off signal to the processing unit when there is overcurrent condition It realizes, can also be realized by building circuit diagram shown in Figure 13；When itself electric current is excessive, the pressure drop of resistance Rs increases Greatly, the base stage of triode Q5 and the pressure drop of emitter just will increase at this time, just will increase to the partial pressure value on ground resistance Rg, resistance The unearthed one end Rg will increase to the level signal that processing unit 13 is sent, and level signal is sent to after processing unit 13, Processing unit 13 will send cut-off signal to switch unit 14 according to the level signal received, and control switch unit 14 is disconnected It opens, completes overcurrent short-circuit protection.Wherein, realize that the process of overcurrent protection belongs to the prior art by circuit diagram shown in Figure 13, The above process is not repeated herein.
Sending cut-off signal to the processing unit when there is the case where power receiving equipment is extracted can be realized by software, It can also be realized by building circuit diagram shown in Figure 14.After power receiving equipment is extracted, itself electric current becomes 0, and at this time two Pole pipe D2 cut-off, the base stage and emitter of triode Q6 disconnect, and are changing to 0 to the pressure drop on ground resistance Rg ', resistance Rg ' is not One end of ground connection is sent to after processing unit 13 to 13 transmission level signal of processing unit, level signal, and processing unit 13 is just Cut-off signal can be sent to switch unit 14 according to the level signal received, control switch unit 14 disconnects, and completion is set by electricity It is standby to extract protection.Wherein, realize that power receiving equipment extracts the process protected and belongs to the prior art by Figure 14, herein not to above-mentioned mistake Cheng Jinhang is repeated.
Embodiment 6:
Figure 15 is power supply system structural schematic diagram provided in an embodiment of the present invention, and the system comprises the power supply units 151 and power receiving equipment 152；Wherein,
The power supply unit 151 is connect with power receiving equipment 152, for being obtained by electricity in real time when being in non-power supply state The partial pressure value of equipment 152 determines that power receiving equipment 152 external connects with described when the partial pressure value is preset first partial pressure value Mouthful connection, and will current time as the first moment；It is determined as the at the time of by the partial pressure value being preset second partial pressure value Two moment；According to first moment and the second moment, determines the rising duration of 152 partial pressure value of power receiving equipment, judge on described Duration is risen whether in the time span of setting, if so, determining that the power receiving equipment 152 is POC equipment, is set to described by electricity Standby 152 power supply；It is not power receiving equipment power supply if not, determining that the power receiving equipment 152 is non-POC equipment.
The power receiving equipment 152 connected in order to prevent burns power receiving equipment 152 when being non-POC equipment, is judging to be set by electricity Standby 152 when to be POC equipment be also non-POC equipment, and power supply unit 151 is needed to judge that power receiving equipment 152 is under non-power supply state POC equipment is also non-POC equipment.
When being in non-power supply state, power supply unit 151 can obtain the partial pressure value of power receiving equipment 152 in real time.When external When interface 15 is not connected with external equipment 152, power supply unit 151 cannot form access with power receiving equipment 152, at this time power supply unit 151 partial pressure values for obtaining power receiving equipment 152 are a biggish voltage value, and when power supply unit 151 connects power receiving equipment 152 When, power supply unit 151 and power receiving equipment 152 form access, and the partial pressure value of the power receiving equipment 152 of the acquisition of power supply unit 151 at this time is One lesser voltage value, therefore preset first partial pressure value can be saved in power supply unit 151, when power supply unit 151 obtains Power receiving equipment 152 partial pressure value be preset first partial pressure value when, determine that power receiving equipment 152 is connect with power supply unit 151, and Will current time as the first moment.Preset second partial pressure value, second partial pressure value can also be saved in power supply unit 151 Greater than first partial pressure value, when the partial pressure value for the power receiving equipment 152 that power supply unit 151 obtains is preset second partial pressure value When, determine that current time was the second moment.According to first moment and the second moment, it can determine that power receiving equipment 152 divides The rising duration of value.The time span that setting is preserved in power supply unit 151, in the rising for determining 152 partial pressure value of power receiving equipment After duration, the rising duration is judged whether in the time span of setting, if it is, determining that the power receiving equipment 152 is Otherwise POC equipment determines that the power receiving equipment 152 is non-POC equipment.If it is determined that the power receiving equipment 152 is POC equipment, It powers to the power receiving equipment 152.If it is determined that the power receiving equipment 152 is non-POC equipment, not to the power receiving equipment 152 Power supply, to avoid burning the power receiving equipment 152.
Embodiment 7:
On the basis of the various embodiments described above, in embodiments of the present invention, the power receiving equipment 152, for believing video Number carry out isolation processing, send the power supply unit 151 for the vision signal after isolation processing.
As shown in figure 16, power receiving equipment 152 includes video output terminals 1521 and load end 1522, and video output terminals 1521 can To send vision signal to power supply unit 151, in order to reduce the decaying of vision signal, the view that power supply unit 151 receives is improved The quality of frequency signal, power receiving equipment 152 can carry out isolation processing to the vision signal that video output terminals 1521 are sent, wherein Isolation processing can be carried out to vision signal using circuit diagram as shown in Figure 5, vision signal is avoided to be sent to load end 1522. And the power supply unit 151 is sent by the vision signal after isolation processing.Wherein, by circuit diagram shown in fig. 5 to video The process that signal carries out isolation processing is no longer repeated herein.
Embodiment 8:
On the basis of the various embodiments described above, in embodiments of the present invention, the power supply unit 151 is also used to extract same Axis countercharge signal, and processing is overlapped to the coaxial countercharge signal, it sends the coaxial countercharge signal after superposition processing to Power receiving equipment 152；
The power receiving equipment 152, is also used to adjust the bias voltage of itself, according to the bias voltage adjusted and connects The coaxial countercharge signal received determines that target is coaxially countercharged signal, and signal of coaxially being countercharged according to target executes corresponding function.
In power supply system provided in an embodiment of the present invention, power supply unit 151 and power receiving equipment 152 are connected by coaxial cable It connects, there is capacitance at coaxial cable both ends respectively, and the capacitance at 152 end of power receiving equipment is connect with video output terminals 1521, use In the electric current that barrier power supply unit 151 is sent.But the presence of capacitance can change the bias voltage of itself.Such as Figure 17 institute Show, if the resistance in power supply unit 151 and power receiving equipment 152 is all 75 Europe, the video output terminals 1521 in power receiving equipment 152 The voltage of output is Vdc, when not having capacitance, due to the partial pressure of 75 Europe resistance in power supply unit 151, so that P point is inclined Setting voltage is Vdc/2, and when there are capacitance, the voltage that the video output terminals 1521 in power receiving equipment 152 export cannot It is transferred to power supply unit 151, the bias voltage of P point is Vdc at this time.The bias voltage of P point is changed, but load end Comparative level Vref is not changed in 1522, will be malfunctioned by the coaxial countercharge signal that comparator extracts in this way.
In order to guarantee that the coaxial countercharge signal extracted is accurate, itself adjustable biased electrical of the power receiving equipment 152 Pressure, as shown in figure 18, power receiving equipment 152 adjust the bias voltage of P point by adjusting voltage Va and adjustment resistance Ra, by adjusting The bias voltage of P point can be adjusted to accurately to be worth by the value of Va and Ra, accurate bias voltage adjusted and receive Coaxial countercharge signal is transferred to comparator, and comparator extracts target and coaxially countercharges signal, and power receiving equipment 152 can be according to target Coaxial countercharge signal executes corresponding function.
In addition, if when comparative level Vref has carried out adjustment according to power supply system in load end 1522, such as than It is adjusted to Vref+Vdc/2 compared with level, such power receiving equipment 152 also can guarantee extraction there is no need to adjust the bias voltage of itself Correct coaxial countercharge signal out.
Embodiment 9:
On the basis of the various embodiments described above, in embodiments of the present invention, the power receiving equipment 152 is also used to identify certainly When body and power supply unit 151 disconnect, make itself repid discharge.
When itself and power supply unit 151 disconnect, occur when being connect again with power supply unit 151 in the short time in order to prevent The excessively high problem of itself electric current needs to make itself repid discharge when identifying that itself and power supply unit 151 disconnect.Wherein it is possible to Repid discharge is realized by circuit diagram described in Figure 19.
As shown in figure 19, the power receiving equipment 152 includes the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th electricity Hinder R9, third transistor Q3 and four triode Q4 and the second capacitor C2；
One end of 6th resistance R6 is connect with power supply unit 151, and one end of the 8th resistance R8 connects the 6th resistance R6 With concatenating a little for power supply unit 151, the other end of the 8th resistance R8 respectively with the collector of third transistor Q3 and the four or three pole The base stage of pipe Q4 connects；One end of 9th resistance R9 connects concatenating a little for the 6th resistance R6 and power supply unit 151, the other end It is connect with the collector of the 4th triode Q4；One end of second capacitor C2 connects the 6th resistance R6 and power supply unit 151 Concatenate point, other end ground connection；One end that 6th resistance R6 is not connect with power supply unit 151 respectively with the 7th resistance R7 and the three or three The base stage of pole pipe Q3 connects；One end ground connection that 7th resistance R7 is not connect with the 6th resistance R6；The emitter of third transistor Q3 It is grounded with the emitter of the 4th triode Q4.
As shown in figure 19, when itself and power supply unit 151 disconnect, slowly due to the second capacitor C2 electric discharge, itself Electric current decline slowly, when itself electric current is higher, the collector and emitter of third transistor Q3 is connected, the 4th triode Q4 Base stage be pulled down to ground, when the electric current of itself drops to certain value, the collector and emitter of third transistor Q3 is disconnected, the The base stage of four triode Q4 is raised, the conducting of the collector and emitter of the 4th triode Q4, and the 9th resistance R9 passes through the at this time The collector of four triode Q4, emitter ground connection, so that the rapid decrease of electric current, that is, realizing makes itself repid discharge.
The embodiment of the invention provides a kind of power supply unit and power supply system, the power supply unit include power input, Recognition unit, processing unit, switch unit and external interface；Wherein, the recognition unit respectively with the external interface and institute Processing unit connection is stated, the external interface is for connecting power receiving equipment；The recognition unit is used for when in non-power supply state When, the partial pressure value of power receiving equipment is obtained in real time, when the partial pressure value is preset first partial pressure value, determines power receiving equipment and institute State external interface connection, and will current time as the first moment；By the partial pressure value be preset second partial pressure value at the time of It was determined as the second moment；According to first moment and the second moment, the rising duration of power receiving equipment partial pressure value is determined, it will be described Rise duration and is sent to processing unit；The processing unit is connect with the recognition unit and the switch unit respectively, described Power input is connect with the switch unit, and the switch unit connects external interface；The processing unit is known for receiving The rising duration that other unit is sent, judge the risings duration whether in the time span of setting, if so, described in determination by Electric equipment is POC equipment, controls the switch unit closure, the power input is by the switch unit to described by electricity Equipment power supply；If not, determining that the power receiving equipment is non-POC equipment, controls the switch unit and disconnect, not to be described by electricity Equipment power supply.Difference in embodiments of the present invention according to the rising duration of the voltage value of POC equipment and non-POC equipment is larger, When being in non-power supply state, power supply unit can obtain the partial pressure value of power receiving equipment in real time, according to point of the power receiving equipment Pressure value can determine the rising duration of power receiving equipment partial pressure value, so that it is determined that the type of power receiving equipment, avoids POC equipment The problem of power receiving equipment caused by type confirmation mistake is burnt.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (11)

1. a kind of power supply unit, which is characterized in that the power supply unit includes power input, recognition unit, processing unit, opens Close unit and external interface；Wherein,
The recognition unit is connect with the external interface and the processing unit respectively, and the external interface is for connecting by electricity Equipment；The recognition unit is used to the partial pressure value of power receiving equipment is obtained in real time, when the partial pressure value when being in non-power supply state When for preset first partial pressure value, determine that power receiving equipment is connect with the external interface, and will current time as the first moment； By the partial pressure value be preset second partial pressure value at the time of be determined as the second moment；When according to first moment and second It carves, determines the rising duration of power receiving equipment partial pressure value, send processing unit for the rising duration；
The processing unit is connect with the recognition unit and the switch unit respectively, the power input and the switch Unit connection, the switch unit connect external interface；The processing unit, when for receiving the rising of recognition unit transmission It is long, the rising duration is judged whether in the time span of setting, if so, determining that the power receiving equipment is POC equipment, control The switch unit closure is made, the power input is powered by the switch unit to the power receiving equipment；If not, really The fixed power receiving equipment is non-POC equipment, controls the switch unit and disconnects, and is not power receiving equipment power supply.
2. power supply unit as described in claim 1, which is characterized in that the power supply unit further include: power supply processing unit, view Frequency processing unit and video receiver；
The power supply processing unit is connect with the power input and the switch unit respectively, for being closed when switch unit When, block the video signal transmission of the power receiving equipment transmission to power input；
The video processing unit is connect with the video receiver and the external interface respectively, is set for receiving described by electricity The vision signal that preparation is sent, and processing is compensated to the vision signal, institute is sent by the vision signal after compensation deals State video receiver.
3. power supply unit as claimed in claim 2, which is characterized in that the power supply processing unit includes first resistor, second Resistance, 3rd resistor, the 4th resistance, the 5th resistance, first capacitor, the first triode, the second triode, inductance and magnetic bead；
One end of first resistor is connect with power input, and one end of second resistance connects the first resistor and power input Concatenation point, the other end of second resistance connect with the emitter of the first triode；First resistor is not connect with power input One end connect respectively with one end of the emitter of the second triode and the 4th resistance；One end connection described first of first capacitor Resistance concatenates a little with power input, the other end respectively with 3rd resistor, the base stage of the first triode and the second triode Base stage connection；
The collector of one end, the first triode that 3rd resistor is not connect with first capacitor, the collector of the second triode and One end that four resistance are not connect with first resistor is connect with one end of magnetic bead respectively；The other end of magnetic bead respectively with inductance and the 5th Resistance connection；One end that inductance and the 5th resistance are not connect with magnetic bead is connect with the switch unit.
4. power supply unit as claimed in claim 2, which is characterized in that the power supply unit further include: surge detection unit；
The surge detection unit is connect with the video processing unit and the external interface respectively, the surge detection list Member, the vision signal for sending to the power receiving equipment carry out low-pass filtering treatment, the video after detecting low-pass filtering treatment The voltage value of signal judges the voltage value whether in preset range of voltage values, if not, to the video processing unit Send control signal；
The video processing unit is also used to when receiving the control signal that the surge detection unit is sent, and is filtered out described The voltage value not vision signal in preset range of voltage values in vision signal, and the vision signal after filtering out is compensated Processing, sends video receiver for the vision signal after compensation deals.
5. power supply unit as claimed in claim 2 or 4, which is characterized in that the video processing unit is also used to extract described The coaxial countercharge signal that video receiver is sent, and processing is overlapped to the coaxial countercharge signal, after superposition processing Coaxial countercharge signal is sent to power receiving equipment by the external interface.
6. power supply unit according to any one of claims 1-4, which is characterized in that the power supply unit further include: protection is single Member；
The protection location is connect with switch unit, processing unit and external interface respectively, and the current value for judging itself is It is no in preset current range, if not, to the processing unit send cut-off signal；
The processing unit after being also used to receive the cut-off signal, controls the switch unit and disconnects.
7. a kind of power supply system, which is characterized in that the system comprises power receiving equipments and as claimed in any one of claims 1 to 6 Power supply unit；Wherein,
The power supply unit is connect with power receiving equipment, for obtaining the partial pressure of power receiving equipment in real time when being in non-power supply state Value, when the partial pressure value be preset first partial pressure value when, determine that power receiving equipment is connect with the external interface, and will be current when It carves and was used as the first moment；By the partial pressure value be preset second partial pressure value at the time of be determined as the second moment；According to described One moment and the second moment determine the rising duration of power receiving equipment partial pressure value, judge it is described rising duration whether setting when Between in length, if so, determining that the power receiving equipment is POC equipment, the power supply of Xiang Suoshu power receiving equipment；If not, described in determining Power receiving equipment is non-POC equipment, is not power receiving equipment power supply.
8. system as claimed in claim 7, which is characterized in that the power receiving equipment, for being carried out at isolation to vision signal Reason, sends the power supply unit for the vision signal after isolation processing.
9. system as claimed in claim 7, which is characterized in that the power supply unit is also used to extract coaxial countercharge signal, and Processing is overlapped to the coaxial countercharge signal, sends power receiving equipment for the coaxial countercharge signal after superposition processing；
The power receiving equipment is also used to adjust the bias voltage of itself, according to the bias voltage adjusted and receives Coaxial countercharge signal determines that target is coaxially countercharged signal, and signal of coaxially being countercharged according to target executes corresponding function.
10. system as claimed in claim 7, which is characterized in that the power receiving equipment is also used to identify itself and power supply unit When disconnection, make itself repid discharge.
11. system as claimed in claim 10, which is characterized in that the power receiving equipment includes the 6th resistance, the 7th resistance, the Eight resistance, the 9th resistance, third transistor, the 4th triode and the second capacitor；
One end of 6th resistance is connect with power supply unit, and one end of the 8th resistance connects the string of the 6th resistance and power supply unit The other end of contact, the 8th resistance is connect with the base stage of the collector of third transistor and the 4th triode respectively；9th resistance One end connect concatenating a little for the 6th resistance and power supply unit, the other end is connect with the collector of the 4th triode；Second One end of capacitor connects concatenating a little for the 6th resistance and power supply unit, other end ground connection；6th resistance not with power supply unit One end of connection is connect with the base stage of the 7th resistance and third transistor respectively；One end that 7th resistance is not connect with the 6th resistance Ground connection；The emitter of the emitter of third transistor and the 4th triode ground connection.
CN201710701636.2A 2017-06-21 2017-08-16 A kind of power supply unit and power supply system Active CN107333085B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201710701636.2A CN107333085B (en) 2017-08-16 2017-08-16 A kind of power supply unit and power supply system
PCT/CN2017/119762 WO2018233268A1 (en) 2017-06-21 2017-12-29 System and method for mixed transmission of signals and power supply through a single cable
EP17914749.1A EP3635948A1 (en) 2017-06-21 2017-12-29 System and method for mixed transmission of signals and power supply through a single cable
US16/708,487 US11196408B2 (en) 2017-06-21 2019-12-10 System and method for mixed transmission of signals and power supply through a single cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710701636.2A CN107333085B (en) 2017-08-16 2017-08-16 A kind of power supply unit and power supply system

Publications (2)

Publication Number Publication Date
CN107333085A CN107333085A (en) 2017-11-07
CN107333085B true CN107333085B (en) 2019-09-17

Family

ID=60200877

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710701636.2A Active CN107333085B (en) 2017-06-21 2017-08-16 A kind of power supply unit and power supply system

Country Status (1)

Country Link
CN (1) CN107333085B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3635948A1 (en) 2017-06-21 2020-04-15 Zhejiang Dahua Technology Co., Ltd System and method for mixed transmission of signals and power supply through a single cable
CN110225283B (en) * 2018-03-02 2021-08-24 杭州海康威视数字技术股份有限公司 Coaxial power supply method, device and system
CN110225284B (en) * 2018-03-02 2021-08-24 杭州海康威视数字技术股份有限公司 Coaxial power supply method, device and system
CN110248149B (en) 2018-10-19 2022-07-19 浙江大华技术股份有限公司 Method and device for supplying power to DVR (digital video recorder)
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
CN110568282B (en) * 2019-07-29 2021-10-22 浙江大华技术股份有限公司 Power supply detection circuit and power receiving end detection method
CN114264868B (en) * 2021-11-30 2023-10-20 深圳飞音时代网络通讯技术有限公司 Detection circuit and method of power receiving end equipment

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4351030B2 (en) * 2003-11-21 2009-10-28 ミハル通信株式会社 CATV device power supply voltage cutoff method, power cut tool used therefor, and power cut tool mounting structure
CN201159761Y (en) * 2008-01-25 2008-12-03 闫洪宝 Commercial power, generator electric power judgment device
CN101860443B (en) * 2010-03-25 2013-01-02 北京星网锐捷网络技术有限公司 POE load detecting method and power supply terminal equipment
CN106303342B (en) * 2015-05-14 2022-11-22 杭州海康威视数字技术股份有限公司 Power supply circuit based on coaxial power supply technology
CN104994269B (en) * 2015-07-22 2018-10-19 杭州海康威视数字技术股份有限公司 Power supply unit, method for controlling power supply and device for image capture device
CN204795311U (en) * 2015-07-22 2015-11-18 杭州海康威视数字技术股份有限公司 A power supply unit for image acquisition equipment
CN105337374A (en) * 2015-12-04 2016-02-17 上海斐讯数据通信技术有限公司 Method for prolonging power supply time
CN106713866B (en) * 2016-12-28 2019-11-19 浙江大华技术股份有限公司 A kind of analog video signal transmitting device and its transmission method

Also Published As

Publication number Publication date
CN107333085A (en) 2017-11-07

Similar Documents

Publication Publication Date Title
CN107333085B (en) A kind of power supply unit and power supply system
US10142586B2 (en) Front-end and back-end processing circuits and POC circuit
KR101877654B1 (en) Detection and classification scheme for power over ethernet system
US10811907B2 (en) Fault protection method and wireless power transmission device using same
CN108475915A (en) Circuit for disconnecting alternating current
CN211953182U (en) Current loop communication circuit
CN205427682U (en) A controlling means for adjusting current transformer transformation ratio of taking a percentage more
CN203632308U (en) Charger
CN204423011U (en) Based on start control circuit and the electronic equipment of near-field communication NFC
CN109494120A (en) Control relay circuit
CN111835074A (en) Multi-output charging head
CN110739665A (en) Protection circuit and switching power supply
CN204989375U (en) Intellectual detection system unit and collection flow box with direct current draws arc to detect function
CN205880574U (en) Intelligence soybean milk machine control circuit
CN107395175A (en) A kind of metal-oxide-semiconductor current foldback circuit
CN204035763U (en) Welding machine automatic switching control circuit
CN211606202U (en) Wireless charging receiving end circuit, related system and chip
CN107483847A (en) A kind of video distributor
CN106982051A (en) A kind of power switch protection circuit
CN104577954B (en) Transformer short-circuit protects circuit
KR102126216B1 (en) Communication device for power equipment device having impedance matching function
CN219065598U (en) Isolated zero-crossing detection circuit and isolated zero-crossing detection device
CN207117586U (en) A kind of metal-oxide-semiconductor current foldback circuit
CN208445813U (en) A kind of hardware circuit based on DALI signal detection
CN206671934U (en) A kind of second protection circuit of toaster

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant