CN106602845A - Central office end power supply safety power supplying method and central office end power supply - Google Patents
Central office end power supply safety power supplying method and central office end power supply Download PDFInfo
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- CN106602845A CN106602845A CN201611256000.3A CN201611256000A CN106602845A CN 106602845 A CN106602845 A CN 106602845A CN 201611256000 A CN201611256000 A CN 201611256000A CN 106602845 A CN106602845 A CN 106602845A
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- supply
- local supply
- local
- load current
- load
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Abstract
The invention discloses a central office end power supply safety power supplying method and a central office end power supply. The method comprises steps that power supplying output to a remote power supply is carried out by the central office end power supply according to a DC main output voltage under any voltage value in a range of 200-400V; a load current of the central office end power supply is detected by the central office end power supply; whether the load current on the central office end power supply is smaller than a zero load current on the central office end power supply is determined; if yes, the central office end power supply is made to rapid discharge, and power supplying output to the remote power supply is carried out by the central office end power supply according to the DC main output voltage under a voltage smaller than 36V. The method is advantaged in that a power supply transmitted by the central office end power supply to the remote power supply under abnormal conditions is guaranteed to be safe.
Description
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of method and local side electricity by local supply safe power supply
Source.
Background technology
With the development and the development of company's all business operation of mobile communication network technology, compartment system, PON, WLAN etc.
Become mobile network cover and access network main construction mode, with BBU (baseband processing unit)+RRU (remote radio),
FTTX (intelligent acess), the construction model that WIFI is main networking mode are widely applied, and network element constantly extends to user side, to moving
Dynamic business and data, the communication quality of audio access business are ensured and propose higher requirement, thus existing communication power supply is protected
Barrier system proposes new requirement, and traditional power supply Support Mode needs to have breakthrough, and direct-current remote feeding power is exactly to carry
Efficient, safe, the novel power supply without access interference of high power with solution communication network device difficulty and development ＆ production.
And Remote Power Supply with the fundamental power supply 48VDC of central machine room transform to 280V/380VDC output, Jing private cables or
Composite cable is transferred to remote equipment, and unidirectional current can be changed into available alternating current or use direct current by distal end with contravariant equipment
Power voltage step down is to 48V so as to realizing remote power feeding.
At present the local supply major part of Remote Power Supply on the market is exchanged with the 48V unidirectional currents of central machine room or 220V
Electricity is directly converted to the output of 200V-400VDC HVDCs, and the far end supply of Jing transmission lines to Remote Power Supply sets to distal end
Available electricity, and far end supply is that 200V-400DC high voltage direct currents are transformed to into supply unit required for remote equipment.
Fig. 1 shows the system structure diagram that local supply of the prior art is powered to far end supply, the system by
Local supply and far end supply two parts are constituted, its operation principle：The general acquiescence 280V of the main output of direct current of local supply, certainly
Direct current master can also be arranged as required to and be output as 200-400V any voltages (such as 380V), when direct current main output voltage arranges true
After recognizing, the main control circuit of local supply goes to control primary transform circuit according to required setting voltage, so that local supply
Meet required voltage output, then Jing transmission lines are passed to far end supply and are powered to remote equipment, the supply voltage of remote equipment
And power is realized by the primary transform circuit of far end supply, local supply watt level depend on far end supply watt level it
With add efficiency and line loss etc..
Because the local supply of Remote Power Supply is direct 200V-400VDC HVDCs output, Jing transmission lines are to remote
End equipment, then the transmission line of high voltage direct current is touched with regard to inevitable workmen, if construction is being constructed with attendant
During with safeguarding, the both positive and negative polarity of transmission line is accidentally touched, or imprudence breaks transmission line, then touch with regard to inevitable personnel
To the both positive and negative polarity of transmission line, so will result in personnel and shock hazard occur, or even electric shock is till death, endangers personal safety, exists
Serious potential safety hazard.The main cause for causing this consequence be not fully examine filter Remote Power Supply be HVDC output, high pressure
There is hidden danger in direct current transmission, transmission line, also do not examine filter HVDC and there is shock hazard.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, the invention provides a kind of local supply is to far end supply
The system and local supply of safe power supply, can with safeguards system in safe power supply pattern to Remote feeding, it is to avoid abnormal conditions
Under also continue to far end supply.
In order to solve the above problems, the present invention proposes a kind of method by local supply safe power supply, including following step
Suddenly：
Supplied to far end supply from any voltage value of the local supply according to the main output valve of direct current in 200V to 400V
Electricity output；
Load current on local supply detection local supply；
Judge the load current on the local supply whether less than the no-load current on local supply；
When load current on local supply is judged is less than the no-load current on local supply, local supply is set quickly to put
Electricity simultaneously makes voltage of the local supply according to the main output valve of direct current in below 36V be powered output to far end supply.
When the load current on local supply is judged is less than the no-load current on local supply, make local supply fast
Speed is discharged and makes local supply be powered output to far end supply in the voltage of below 36V according to the main output valve of direct current to be included：
Local supply detects the load current on local supply based on no load detection circuit；
When load current on the local supply is judged is less than the no-load current on local supply, on local supply
No load detection circuit sends voltage control signal to main control circuit；
The main control circuit to discharge circuit sends repid discharge control signal；
The discharge circuit carries out repid discharge based on discharge control signal, makes local supply exist according to the main output valve of direct current
The voltage of below 36V to far end supply is powered output.
The voltage that local supply is made according to the main output valve of direct current in below 36V is powered output to far end supply
Also include afterwards：
Whether far end supply detection local supply has supply input, and detecting local supply in far end supply has supply input
When, starting the work of the dummy load circuit on far end supply makes the load current on power transmission line reach constant-current source setting value, the perseverance
Stream source setting value is more than the no-load current on local supply；
Whether the load current on local supply detection local supply is more than the no-load current on local supply, if detection institute
When stating load current on local supply more than no-load current on local supply, local supply is according to set output voltage
Any voltage value of the main output valve of control direct current in 200V to 400V.
The local supply is arbitrary in 200V to 400V according to the set main output valve of output voltage control direct current
Also include after magnitude of voltage：
Whether the load current on the far end supply detection far end supply is more than constant-current source setting value, if the distal end is electric
Load current value on source is more than constant-current source setting value, then stop the dummy load circuit work.
Dummy load circuit work on the startup far end supply makes the load current on power transmission line reach constant-current source setting
Also include during value：
Based on the load current on the no load detection circuit detection local supply on local supply, and judge the local side electricity
Whether the load current on source is less than the no-load current on local supply, if the load current on the local supply is less than zero load
Electric current, then continue the voltage from local supply according to the main output valve of direct current in below 36V and be powered output to far end supply.
The local supply is arbitrary in 200V to 400V according to the set main output valve of output voltage control direct current
Magnitude of voltage includes：
No load detection circuit on the local supply to main control circuit sends voltage control signal；
Main control circuit goes to control primary transform circuit according to set voltage；
The primary transform circuit makes the arbitrary electricity of output voltage that the main output module of direct current exported in 200V to 400V
Pressure value.
Accordingly, the invention allows for a kind of local supply, for existing according to the main output valve of direct current in local supply
Any voltage value in 200V to 400V to far end supply be powered output when, detect power detecting local supply on load
Electric current；Judge the load current on the local supply whether less than the no-load current on local supply；Judging local supply
On load current less than no-load current on local supply when, make local supply repid discharge and make local supply according to direct current
Main output valve is powered output in the voltage of below 36V to far end supply.
The local side apparatus include：
No load detection circuit, for detecting the load current on local supply, and judges the load current on local supply
With the magnitude relationship between the no-load current on local supply, and based on magnitude relationship send voltage control signal give main control electricity
Road；
Main control circuit, for receiving the voltage control signal of no load detection circuit transmission, and based on voltage control signal
Repid discharge control signal is sent to discharge circuit；
Discharge circuit, for carrying out repid discharge based on discharge control signal, makes local supply according to the main output valve of direct current
Output is powered in the voltage of below 36V to far end supply.
The local supply also includes：
Primary transform circuit, for receiving the change in voltage control signal of main control circuit；
The main output module of direct current, for making output voltage export in corresponding state based on the control of main control circuit.
In embodiments of the present invention, either starting is exported in still abnormal electricity transmission process, ensures that local supply is transferred to far
The power supply of end power supply is safe, and by no load detection circuit the abnormality detection feelings to local side power source loads can be realized
Condition.Can play detect based on the dummy load circuit on far end supply and whether have supply input on far end supply, if there is
Supply input, then start dummy load circuit work, promotes the lifting of the current value on whole transmission line to reach local supply and is met
The condition of normal work.When no load detection circuit on local supply detects load current more than no-load current, then normally supply
Electricity is input to far end supply.Therefore, under from local supply to the system original transmission of Remote Power Supply or abnormal conditions, local side electricity
Source to the pattern that far end supply is powered all is in below 36V safe voltages, under whole normal operation, it is possible to achieve high pressure
Unidirectional current, meets power demands.Even in construction, maintenance or cable bad, the transmission voltage of the system can be returned again
To below 36V safe voltages, although the work of whole remote feeding power system is the high voltage direct current for suspending, people really can touch
Be but below 36V safe voltages；Remote feeding power system is solved in HVDC transmission, personnel's shock hazard etc. is caused
Problem；Circuit design is simple, but makes whole electric power system in transmission, does not result in shock hazard, endangers personal safety.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the system structure diagram that local supply of the prior art is powered to far end supply；
Fig. 2 is the system structure diagram that the local supply in the embodiment of the present invention is powered to far end supply；
Fig. 3 is the circuit theory diagrams of the no load detection circuit in the embodiment of the present invention；
Fig. 4 is the circuit theory diagrams of the discharge circuit in the embodiment of the present invention；
Fig. 5 is the circuit theory diagrams of the dummy load circuit in the embodiment of the present invention；
Fig. 6 is the method flow diagram by local supply safe power supply in the embodiment of the present invention；
Fig. 7 is another flow chart of the method by local supply safe power supply in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Specifically, Fig. 2 shows that the local supply in the embodiment of the present invention is illustrated to the system structure that far end supply is powered
Figure, the system includes：Local supply and far end supply, local supply to far end supply is powered input based on transmission line.
In specific implementation process, the load current that local supply is used on local supply is detected is less than local supply
No-load current when, be powered output to far end supply from voltage of the local supply according to the main output valve of direct current in below 36V；
And the load current on local supply is detected more than no-load current on local supply when, according to set output electricity
Any voltage value of the main output valve of voltage-controlled direct current processed in 200V to 400V；Far end supply is used for having confession detecting local supply
During electricity input, in below 36V, start the work of the dummy load circuit on far end supply makes on power transmission line the magnitude of voltage of the supply input
Load current reach constant-current source setting value, the constant-current source setting value is more than the no-load current on local supply.
It should be noted that the magnitude of voltage of the supply input is that local supply starts to start to far end supply in below 36V
(i.e. local supply does not have to Remote feeding input, and when powering, the powering mode for starting below 36V is supplied for power supply
Electricity), or because under abnormal conditions (such as power transmission line break, or operator's operational error cause power transmission line short circuit etc.),
Local supply to far end supply powering mode liquid is powered using the powering mode of below 36V.Far end supply does not start in local side
When under power supply or abnormal conditions, cannot detect local supply based on the functional template on far end supply has supply input, i.e.,
Without electric current input.When power supply or abnormal reply is started, when energy normal power supply is to far end supply on transmission line, now initially
Dummy load circuit of the power values on below 36V, local supply is started working, and promotes the current value on power transmission line to increase, finally
Realize local supply normal power supply pattern (any voltage value of the main output valve of control direct current in 200V to 400V).Unloaded electricity
Stream such as 30 milliamperes, if load current is more than no-load current, illustrates the local supply on loading typically between 25 to 35 milliamperes
Communicate with far end supply, can carry out being normally carried out power supply, if load current is less than no-load current, illustrate the local side on loading
Power supply is not communicated with far end supply, it is impossible to carry out normal power supply.
In specific implementation process, local supply includes：200VAC exchange/48VDC direct current input modules, main control circuit,
The main output module of primary transform circuit, discharge circuit, no load detection circuit, direct current, and sampling resistor R1, wherein：200VAC is handed over
Stream/48VDC direct currents input module with it is existing in function phase it is same, there is provided upper level is input into power supply interface, for local supply to remote
End power input.
Primary transform circuit in local supply is controlled by master control control circuit, and it receives the change in voltage control of main control circuit
Signal processed, primary transform circuit controls the main output valve of direct current that the main output module of direct current is exported under the control of main control circuit,
Generally two states, when power supply or abnormal conditions are started, the main output module of main varying circuit control direct current is according to direct current
Main output valve is powered output in the voltage of below 36V to far end supply；In normal power supply state, the control of primary transform circuit
Any voltage value of the main output module of direct current according to the main output valve of direct current in 200V to 400V is powered defeated to far end supply
Go out.
Main control circuit in local supply is used to receive the voltage control signal of no load detection circuit transmission, the voltage control
Signal processed is two kinds, and one kind is repid discharge control signal, and the repid discharge control signal can make appointing in 200V to 400V
One magnitude of voltage to the voltage of below 36V changes, and repid discharge control signal is sent to discharge circuit based on voltage control signal；One
It is to open normal power supply signal to plant, and makes power supply initial value obtain any voltage of the powering mode in 200V to 400V in below 36V
The voltage transformation of value.
The load current that no load detection circuit in local supply is sampled on local supply based on sampling resistor R1, and judge
The magnitude relationship between the no-load current on load current and local supply on local supply, and electricity is sent based on magnitude relationship
To main control circuit, the voltage control signal can promote local supply to complete the switching between different output voltages to pressure control signal
Process, such as from the switching of any voltage value in the voltage to 200V to 400V of below 36V, or by 200V to 400V
Voltage switching of any voltage value to below 36V.Fig. 3 shows the circuit theory of the no load detection circuit in the embodiment of the present invention
Figure, wherein network IS1+ is local supply load current sampled signal, and network VCC is the supply voltage of U1, and network+3.3V is office
End main power control circuit supply voltage, voltage on the basis of network VREF, network IS-CT be load current control signal, U1A
And peripheral circuit composition current amplification circuit, U1B and peripheral circuit composition no-load current control circuit etc..
Discharge circuit in local supply be used for by local supply according to the main output valve of direct current in 200V to 400V
Any voltage value to far end supply be powered output when, local supply detection local supply on load current；Judge described
Whether the load current on local supply is less than the no-load current on local supply；Load current on local supply is judged is little
During no-load current on local supply, make local supply repid discharge and make local supply according to the main output valve of direct current in 36V
Following voltage to far end supply is powered output.Specifically, Fig. 4 shows the electricity of the discharge circuit in the embodiment of the present invention
Road schematic diagram, wherein network 200V-400V for local supply direct current main output voltage, network VCC for Q4 supply voltage, net
Network DISC is the discharge control signal of local supply, Q2, Q3, Q4 and peripheral circuit composition quick discharging circuit.
Entirely local supply mode of operation is：The main output of direct current of local supply is gone to control primary transform electricity by main control circuit
Road first exports the safe voltage of below 36V, and by no load detection circuit load current is detected；If load current is less than no-load current
The electric current of detection, then export always below 36V safe voltages；If load current is more than no-load current, then IS-CT no-load currents
Control signal is low level, and it is the master control of local supply after low level signal that the main control circuit of local supply receives IS-CT
Circuit processed goes to control primary transform circuit according to set voltage, so that the direct current main output voltage of local supply is 200V-
400V any voltages；Even if in construction and when safeguarding, transmission line damages one or two, then now load current is less than zero load
The electric current of current detecting, then IS-CT no-load currents control signal is high level, and the main control circuit of local supply receives IS-
CT is that the main control circuit of local supply exports immediately discharge control signal DISC, discharge control signal after high level signal
DISC Jing Q2, Q3, Q4 and peripheral circuit repid discharge, make the safe voltage that direct current main output voltage is below 36V.
In specific implementation process, far end supply includes：Primary transform circuit, dummy load circuit and sampling resistor R2.The distal end
Power supply is additionally operable to detect whether the load current on far end supply is more than constant-current source setting value, if the load current on far end supply
Value is more than constant-current source setting value, then stop dummy load circuit work, and the dummy load circuit is based on to be realized to distal end using resistance R2
The detection of the load current on power supply, when dummy load circuit has detected supply input and has load current, you can start work,
The load current on power transmission line is set to reach constant-current source setting value, the constant-current source setting value is more than the no-load current on local supply.
Specifically, Fig. 5 shows the circuit theory diagrams of the dummy load circuit in the embodiment of the present invention, and wherein network IS2+ is far end supply
Load current sampling, network VCC for U2 supply voltage, network PRO for far end supply fictitious load shutdown signal, network
Voltage on the basis of VREF, network 200V-400V is the direct current primary input voltage of far end supply, U2A and peripheral circuit composition electric current
Amplifying circuit, U2B and peripheral circuit composition fictitious load closing control circuit；Q6, Q7 and peripheral circuit composition dummy load circuit are (permanent
Stream source).
Far end supply operation principle：Because the direct current main output voltage of local supply has just started the safety electricity for below 36V
Pressure, the voltage for being transferred to far end supply is also below 36V, and in order to ensure the normal work of whole system, then far end supply needs to increase
Plus the load current that is loaded on transmission line of dummy load circuit, i.e. fictitious load have to be larger than the no-load current detection of local supply
Electric current, so can just be such that whole system is operated on the arbitrary high direct voltage points of 200V-400V.Under transmission line fine status, when
When below the 36V safe voltages Jing transmission line of local supply is to far end supply, the fictitious load electricity being made up of Q6, Q7 and peripheral circuit
Road (constant-current source) is started working, because the current value of constant-current source setting value is more than the electric current that the no-load current of local supply is detected
It is worth, then the main control circuit of local supply goes to control primary transform circuit according to set voltage, so that local supply is straight
Stream main output voltage is 200V-400V any voltages, and works as the load current IS2+ of remote equipment more than constant-current source setting value
During current value, far end supply closes fictitious load (constant-current source), so as to improve the work efficiency of far end supply；I.e. when remote equipment
Load current IS2+ Jing after U2 and peripheral circuit amplification ratio effect, go to close fictitious load (constant current by the fictitious load shutdown signal of generation
Source).
The method by local supply safe power supply in the embodiment of the present invention, opens in local supply and is supplied to far end supply
Electricity, transmission line non-failure conditions, or in transmission line Failure elimination, existed according to the main output valve of direct current by local supply
The voltage of below 36V to far end supply is powered output, has ensured the voltage on transmission line not over 36V, far end supply
When detecting local supply and having supply input, start the load current that the work of the dummy load circuit on far end supply makes on power transmission line
Constant-current source setting value is reached, the constant-current source setting value is more than the no-load current on local supply；Local supply detection local side electricity
Whether more than the no-load current on local supply, if detecting, the load current on the local supply is more than load current on source
During no-load current on local supply, local supply according to the set main output valve of output voltage control direct current in 200V extremely
Any voltage value in 400V.
Specifically, Fig. 6 shows the method flow diagram by local supply safe power supply in the embodiment of the present invention, including such as
Lower step：
S601, local supply recover normally to the transmission line of electricity between far end supply or local supply starts to far end supply
Power supply；
During the embodiment of the present invention, initially powered to far end supply from local supply or transmission line of electricity recovers positive reason
All it is to work in a low voltage state under condition, far end supply cannot detect before this electric current and pass through, i.e., not powering is input to
On far end supply, far end supply is in does not have working condition.
S602, carried out according to the voltage of below 36V by the main output circuit of master control circuit controls direct current in local supply
Output；
In the process, due to transmission line of electricity normal power-up, the 36V low-voltages in local supply can be arrived to distal end electricity
On source.
Whether there is supply input on dummy load circuit detection power transmission line in S603, far end supply, if having detected power supply
Input, then into S604, otherwise continue S602；
Whether the dummy load circuit in far end supply can be has supply input, in line vias feelings on real-time detection power transmission line
Under condition, when having supply input, then dummy load circuit enters work for dummy load circuit detection, if to have can't detect power supply defeated for fictitious load
Enter, illustrate power transmission line obstructed (power transmission line has an abnormal conditions, including broken string or short circuit etc.), whole fictitious load does not work,
Whole local supply is still powered input using the low voltage mode of below 36V to far end supply.
S604, startup dummy load circuit are started working, and power transmission line is carried out according to the constant-current source setting value that fictitious load sets
Current value is input into；
When dummy load circuit has only detected supply input, just start working, set according to the constant-current source that fictitious load is arranged
Definite value carries out current value input, and the constant-current source setting value shows more than the no-load current on local supply, the current load success
Whole remote power feeding input is normal, can be completed from local supply to remote power supply normal power supply.Ensureing to whole power transmission line
On load current can exceed that no-load current, whole follow-up normal power supply pattern could start.
S605, based on local supply no load detection circuit detection local supply on load current；
The step exists always in whole power supply process, and it can play the load electricity on real-time detection local supply
Stream, in whole implementation process, it has been required to be concerned about whole load current change procedure, so as to ensure whole local supply reality
Now accordingly control.After step S603 is completed, its load current can meet the load current of local supply and be more than local side
The no-load current situation of power supply, promotes whole Transmission Mode to change.
No-load current on the whether little local supply of S606, the load current judged on local supply, if judging load electricity
Stream is less than no-load current, then carry out step S602, if load current is more than no-load current, into S607；
No load detection circuit on S607, local supply sends voltage control signal；
Main control circuit on S608, local supply goes to control primary transform circuit according to set voltage；
It is any voltage in 200V-400V that S609, primary transform circuit make the output voltage that the main output circuit of direct current is exported
Value；
Step S607 to step S608 complete from less than 36V power supplys in 200-400V any voltage value power supply turn
Become, in load current more than the electric current that no-load current is detected, then IS-CT no-load currents control signal is low level, local side is electric
The main control circuit in source receives IS-CT for after low level signal, the main control circuit of local supply is according to set voltage
Go to control primary transform circuit, so that the direct current main output voltage of local supply is 200V-400V any voltages.
The load current on dummy load circuit real-time detection far end supply in S610, far end supply；
Whether S611, the load current judged on far end supply are more than constant-current source setting value, if it is greater, then into 612,
Otherwise continue S610；
S612, dummy load circuit stop being operated.
Step S610 to step S612 is working condition change of the local supply when being input into into normal power supply, its
When the load current IS2+ of remote equipment is more than the current value of constant-current source setting value, far end supply closes fictitious load (constant current
Source), so as to improve the work efficiency of far end supply；I.e. as the load current IS2+ Jing U2 and peripheral circuit amplification ratio of remote equipment
After effect, the fictitious load shutdown signal of generation goes to close fictitious load (constant-current source).
The method by local supply safe power supply in the embodiment of the present invention, it is extremely prominent to far end supply for local supply
When in the case of the mechanism of sending out, a kind of coping strategy is also provided, i.e., in normal power supply, happen suddenly power transmission line break or short circuit etc.
Deng.Abnormal conditions exist before, from any voltage value of the local supply according to the main output valve of direct current in 200V to 400V to
Far end supply is powered output, and in whole process, local supply can all detect the load current surveyed on local supply, judge
Whether the load current on the local supply is less than the no-load current on local supply.When emergency case occurs, local side electricity
Source can judge that the load current on local supply is less than the no-load current on local supply, and now, can trigger makes local supply
Repid discharge, and make voltage of the local supply according to the main output valve of direct current in below 36V be powered output to far end supply.
Specifically, Fig. 7 shows another flow chart of the method by local supply safe power supply in the embodiment of the present invention, bag
Include following steps：
S701, local supply in far end supply normal power supply (200V-400V any values)；
S702, based on local supply no load detection circuit detection transmission line on load current；
Whether S703, the load current judged on transmission line are less than the no-load current value corresponding to output voltage, if being less than
S704 is then entered, if being more than S701 is continued；
Load detecting circuit on S704, local supply sends voltage control signal；
Main control circuit on S705, local supply to discharge circuit sends discharge control signal；
S706, discharge circuit carry out repid discharge based on discharge control signal, make the voltage output value of the main output of direct current little
In 36V.
Whole discharge process is completed on local supply, and the load current on local supply is judged is less than local side electricity
During no-load current on source, make local supply repid discharge and make local supply according to the main output valve of direct current below 36V electricity
Pressing to far end supply and being powered output includes：Local supply detects the load electricity on local supply based on no load detection circuit
Stream；When load current on the local supply is judged is less than the no-load current on local supply, the zero load on local supply
Detection circuit sends voltage control signal to main control circuit；The main control circuit to discharge circuit sends repid discharge control
Signal；The discharge circuit carries out repid discharge based on discharge control signal, makes local supply according to the main output valve of direct current in 36V
Following voltage to far end supply is powered output.
If whole abnormal conditions are replied, when power transmission line can realize normal power supply, local supply power to far end supply and
Process as shown in Figure 6 can be triggered, is repeated no more here.
For the flow chart shown in Fig. 7, local supply local supply according to the main output valve of direct current in 200V to 400V
Any voltage value to far end supply be powered output when, detect power detecting local supply on load current；Judge institute
The load current on local supply is stated whether less than the no-load current on local supply；Load current on local supply is judged
During less than no-load current on local supply, make local supply repid discharge and make local supply exist according to the main output valve of direct current
The voltage of below 36V to far end supply is powered output.Local supply structural representation as shown in Figure 2, including：Zero load inspection
Slowdown monitoring circuit, main control circuit, discharge circuit, primary transform circuit and the main output module of direct current etc..
To sum up, either starting is exported in still abnormal electricity transmission process in the embodiment of the present invention, ensures that local supply is transferred to
The power supply of far end supply is safe, and by no load detection circuit the abnormality detection feelings to local side power source loads can be realized
Condition.Can play detect based on the dummy load circuit on far end supply and whether have supply input on far end supply, if there is
Supply input, then start dummy load circuit work, promotes the lifting of the current value on whole transmission line to reach local supply and is met
The condition of normal work.When no load detection circuit on local supply detects load current more than no-load current, then normally supply
Electricity is input to far end supply.Therefore, under from local supply to the system original transmission of Remote Power Supply or abnormal conditions, local side electricity
Source to the pattern that far end supply is powered all is in below 36V safe voltages, under whole normal operation, it is possible to achieve high pressure
Unidirectional current, meets power demands.Even in construction, maintenance or cable bad, the transmission voltage of the system can be returned again
To below 36V safe voltages, although the work of whole remote feeding power system is the high voltage direct current for suspending, people really can touch
Be but below 36V safe voltages；Remote feeding power system is solved in HVDC transmission, personnel's shock hazard etc. is caused
Problem；Circuit design is simple, but makes whole electric power system in transmission, does not result in shock hazard, endangers personal safety.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
Completed with instructing the hardware of correlation by program, the program can be stored in a computer-readable recording medium, storage
Medium can include：Read only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
In addition, the embodiment of the present invention is provided above is carried out by the method and local supply of local supply safe power supply
It is discussed in detail, specific case used herein is set forth to the principle and embodiment of the present invention, above example
Explanation be only intended to help and understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art,
According to the thought of the present invention, will change in specific embodiments and applications, in sum, in this specification
Appearance should not be construed as limiting the invention.
Claims (9)
1. a kind of method by local supply safe power supply, it is characterised in that comprise the steps：
It is powered to far end supply from any voltage value of the local supply according to the main output valve of direct current in 200V to 400V defeated
Go out；
Load current on local supply detection local supply；
Judge the load current on the local supply whether less than the no-load current on local supply；
When load current on local supply is judged is less than the no-load current on local supply, local supply repid discharge is made simultaneously
Voltage of the local supply according to the main output valve of direct current in below 36V is set to be powered output to far end supply.
2. as claimed in claim 1 by the method for local supply safe power supply, it is characterised in that described to judge local supply
On load current less than no-load current on local supply when, make local supply repid discharge and make local supply according to direct current
Main output valve is powered output in the voltage of below 36V to far end supply to be included：
Local supply detects the load current on local supply based on no load detection circuit；
When load current on the local supply is judged is less than the no-load current on local supply, the zero load on local supply
Detection circuit sends voltage control signal to main control circuit；
The main control circuit to discharge circuit sends repid discharge control signal；
The discharge circuit carries out repid discharge based on discharge control signal, makes local supply according to the main output valve of direct current in 36V
Following voltage to far end supply is powered output.
3. as described in claim 1 or 2 by the method for local supply safe power supply, it is characterised in that described to make local side electricity
Source also includes according to the main output valve of direct current after the voltage of below 36V is powered output to far end supply：
Whether far end supply detection local supply has supply input, when far end supply detects local supply and has supply input,
Starting the work of the dummy load circuit on far end supply makes the load current on power transmission line reach constant-current source setting value, the constant-current source
Setting value is more than the no-load current on local supply；
Whether the load current on local supply detection local supply is more than the no-load current on local supply, if detecting the office
When load current on the power supply of end is more than the no-load current on local supply, local supply is according to set output voltage control
Any voltage value of the main output valve of direct current in 200V to 400V.
4. as claimed in claim 3 by the method for local supply safe power supply, it is characterised in that the local supply is according to institute
The main output valve of output voltage control direct current of setting also includes after any voltage value in 200V to 400V：
Whether the load current on the far end supply detection far end supply is more than constant-current source setting value, if on the far end supply
Load current value be more than constant-current source setting value, then stop dummy load circuit work.
5. as claimed in claim 3 by the method for local supply safe power supply, it is characterised in that on the startup far end supply
Dummy load circuit work reach the load current on power transmission line also to include during constant-current source setting value：
Based on the load current on the no load detection circuit detection local supply on local supply, and judge on the local supply
Load current whether less than the no-load current on local supply, if the load current on the local supply is less than unloaded electricity
Stream, then continue the voltage from local supply according to the main output valve of direct current in below 36V and be powered output to far end supply.
6. as claimed in claim 3 by the method for local supply safe power supply, it is characterised in that the local supply is according to institute
Any voltage value of the main output valve of output voltage control direct current of setting in 200V to 400V includes：
No load detection circuit on the local supply to main control circuit sends voltage control signal；
Main control circuit goes to control primary transform circuit according to set voltage；
The primary transform circuit makes any voltage value of output voltage that the main output module of direct current exported in 200V to 400V.
7. a kind of local supply, it is characterised in that for local supply according to the main output valve of direct current in 200V to 400V
Any voltage value to far end supply be powered output when, detect power detecting local supply on load current；Judge described
Whether the load current on local supply is less than the no-load current on local supply；Load current on local supply is judged is little
During no-load current on local supply, make local supply repid discharge and make local supply according to the main output valve of direct current in 36V
Following voltage to far end supply is powered output.
8. local supply as claimed in claim 7, it is characterised in that the local side apparatus include：
No load detection circuit, for detecting the load current on local supply, and judges the load current on local supply and office
The magnitude relationship between no-load current on the power supply of end, and voltage control signal is sent to main control circuit based on magnitude relationship；
Main control circuit, for receiving the voltage control signal of no load detection circuit transmission, and based on voltage control signal to putting
Circuit sends repid discharge control signal；
Discharge circuit, for carrying out repid discharge based on discharge control signal, makes local supply according to the main output valve of direct current in 36V
Following voltage to far end supply is powered output.
9. local supply as claimed in claim 8, it is characterised in that the local supply also includes：
Primary transform circuit, for receiving the change in voltage control signal of main control circuit；
The main output module of direct current, for making output voltage export in corresponding state based on the control of main control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611256000.3A CN106602845A (en) | 2016-12-30 | 2016-12-30 | Central office end power supply safety power supplying method and central office end power supply |
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| CN201611256000.3A CN106602845A (en) | 2016-12-30 | 2016-12-30 | Central office end power supply safety power supplying method and central office end power supply |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509076U (en) * | 2009-09-25 | 2010-06-16 | 佛山市联动科技实业有限公司 | Remote DC power supply system of movable communication power supply |
-
2016
- 2016-12-30 CN CN201611256000.3A patent/CN106602845A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509076U (en) * | 2009-09-25 | 2010-06-16 | 佛山市联动科技实业有限公司 | Remote DC power supply system of movable communication power supply |
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Effective date of registration: 20170703 Address after: 510700 R & D plant, No. 3, West spectral Road, Whampoa District, Guangdong, Guangzhou 7, 709 Applicant after: Guangzhou Jing Jing Electronics Co., Ltd. Address before: 510000, Guangzhou, Guangdong province Whampoa Guangzhou Science City spectrum west 3 R & D building, west block, 7 floor Applicant before: Guangzhou Greatecn Technology Development Co., Ltd. |
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Application publication date: 20170426 |