CN106787045A - DC power system and its control method - Google Patents
DC power system and its control method Download PDFInfo
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- CN106787045A CN106787045A CN201611258873.8A CN201611258873A CN106787045A CN 106787045 A CN106787045 A CN 106787045A CN 201611258873 A CN201611258873 A CN 201611258873A CN 106787045 A CN106787045 A CN 106787045A
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- Prior art keywords
- unit
- lithium battery
- charging
- power system
- lithium
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
- H02J7/0032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention provides a kind of DC power system and its control method, the DC power system is powered for user load, including Alternating Current Unit, rectification unit, Direct Current Distribution Unit, lithium cells and monitoring unit, when the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit is by the Direct Current Distribution Unit for the user load is powered；When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells are by the Direct Current Distribution Unit for the user load is powered；The Direct Current Distribution Unit includes charging and discharging circuit and standby discharge loop, lithium cells connect the Direct Current Distribution Unit and are charged by rectification unit by the charging and discharging circuit, and the lithium cells are powered by the standby discharge loop and the charging and discharging circuit to the user load.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of DC power system and its control method.
Background technology
Current communication equipment is mainly powered using DC48V, DC240V and DC336V power-supply system, these power-supply system applications
Occasion is extremely important, and to ensure the continuity of power supply, these communication DC power-supply systems can use battery conduct in design
Backup emergency power supply.
Battery typically all uses lead-acid battery in traditional communication DC power-supply system, and Fig. 1 is existing with plumbic acid
The DC power system schematic diagram of battery, the characteristics of power supply of current communication DC power-supply system is as follows：AC network is by exchange
Power supply unit 1 is powered to rectification unit 2, and monitoring unit 4 is detected to Alternating Current Unit 1, and rectification unit 2 and direct current are matched somebody with somebody
Electric unit 3 is monitored, and rectification unit 2 is powered by Direct Current Distribution Unit 3 to user load 6, for prevention AC network is unexpected
Have a power failure and do not interrupt and powered to user load, inside needs to connect always on Direct Current Distribution Unit 3 for the battery pack of lead-acid battery；
Rectification unit 2 gives battery unit always by Direct Current Distribution Unit 3 while being powered to user load 6 when AC network is normal
Charge, the current measuring device 31 of discharge and recharge identification detects charging current with anti-overcharge.Lithium battery is due to excellent charge and discharge
Electrical characteristics, specific energy are big, long lifespan, environmental protection the advantages of, just progressively replacing traditional lead-acid battery to apply in communication DC power supply
In system, a key difference with lead-acid battery charge characteristic is：Need to stop charging after being full of.
Fig. 2 is the existing DC power system schematic diagram with lithium battery, as shown in Fig. 2 in current supporting lithium battery
Communication DC power-supply system in, to ensure the charging requirement of lithium battery group 51, lithium cells 5 all can integrated lithium battery management
System 52 manages charging, ensuring to stop to fill after being full of.Lithium battery management system 52 is except the letter of the internal lithium battery group 51 of monitoring
Breath is outer, is also equipped with charging excessively stream, full of the protection such as stopping filling.Lithium battery management system 52 can disconnect lithium when these protections are performed
The connection of battery pack 51 and user load 6.In communication DC power-supply system, battery " disengaging " dc bus is abnormally dangerous, and one
Denier AC network has a power failure, and lithium battery management system 52 to be responded may result in not in time lithium battery group 51 and can not close in time and powered back
Road, the risk for causing power supply " zero " to be interrupted.
Accordingly, it would be desirable to design one kind be applied to lithium battery group, can be while realizing fully charged stopping filling and " zero " interrupts electric discharge
DC power system and its control method.
The content of the invention
It is an object of the invention to provide a kind of DC power system and its control method, to solve existing to be applied to lithium
The DC power system of battery pack can not simultaneously realize the fully charged problem stopped filling and electric discharge is interrupted with " zero ".
In order to solve the above technical problems, the present invention provides a kind of DC power system, the DC power system is user
Load supplying, the DC power system include Alternating Current Unit, rectification unit, Direct Current Distribution Unit, lithium cells and
Monitoring unit, wherein：
The Alternating Current Unit connects the rectification unit, and the rectification unit connects the Direct Current Distribution Unit, institute
State Direct Current Distribution Unit and connect the lithium cells, the monitoring unit monitors the Alternating Current Unit and lithium cells
And monitor rectification unit and the Direct Current Distribution Unit；
When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit is by the DC distribution
Unit is powered for the user load；
When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells are matched somebody with somebody by the direct current
Electric unit is powered for the user load；
The Direct Current Distribution Unit includes charging and discharging circuit, standby discharge loop and dc bus negative pole, wherein：It is described to fill
Discharge loop and the standby discharge loop are in parallel, and are connected between the lithium cells and dc bus negative pole；
The lithium cells connect the dc bus negative pole and by the rectification unit by the charging and discharging circuit
Charge, the lithium cells are powered by the standby discharge loop and the charging and discharging circuit to the user load.
Optionally, in described DC power system, the standby discharge loop includes partly leading for a unilateral conduction
Body device.
Optionally, in described DC power system, the semiconductor devices of the unilateral conduction is diode, described
The anode of diode connects the dc bus negative pole, and the negative electrode of the diode connects the negative pole of lithium cells.
Optionally, in described DC power system, the lithium cells include that lithium battery group and lithium battery are managed
System, the lithium battery management system is monitored to the lithium battery group.
Optionally, in described DC power system, the Direct Current Distribution Unit also includes the electric current of discharge and recharge identification
Measurement apparatus, the current measuring device of the discharge and recharge identification is concatenated with the shunt circuit of charging and discharging circuit and standby discharge loop
Between dc bus negative pole and lithium cells, the current measuring device of discharge and recharge identification be used for monitor current direction and
Current amplitude.
Optionally, in described DC power system, the monitoring unit monitors the lithium battery management system and institute
The current measuring device of discharge and recharge identification is stated, when the charging current amplitude exceedes preset value, monitoring unit is according to charging current
The output of rectification unit described in amplitude real-time adjustment, when lithium battery group is fully charged, monitoring unit disconnects charging and discharging circuit.
Optionally, in described DC power system, the charging and discharging circuit includes a remote-controlled folding class switch, institute
Remote-controlled folding class switch is stated to be controlled by the monitoring unit.
The present invention also provides a kind of control method of DC power system, the control method bag of the direct current component system
Include：
The monitoring unit is monitored the Alternating Current Unit and lithium cells and monitors rectification unit and DC distribution
Unit；
When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit is by the DC distribution
Unit is powered for the user load, and the rectification is connected by the charging and discharging circuit when lithium cells need to charge
Unit is charged, and the charging and discharging circuit disconnects with the rectification unit when fully charged；
When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells are successively by described standby
User load is powered with discharge loop and the charging and discharging circuit.
Optionally, in the control method of described DC power system, the control method of the DC power system is also
Including：Rectification unit output voltage less than lithium battery group voltage when, the lithium cells first pass through described standby put
Electrical circuit is powered to user load, and after waiting charging and discharging circuit closure, lithium cells are by standby discharge loop and discharge and recharge
Loop powers to the user load.
Optionally, in the control method of described DC power system, the standby discharge loop is only in rectification unit
Output voltage is turned on when being less than lithium cells voltage.
Optionally, in the control method of described DC power system, the control method of the DC power system is also
Including：In the lithium cells, lithium battery management system is monitored to the lithium battery group.
Optionally, in the control method of described DC power system, the control method of the DC power system is also
Including：The current measuring device monitor current direction of the discharge and recharge identification and current amplitude.
Optionally, in the control method of described DC power system, the control method of the DC power system is also
Including：The monitoring unit monitors the current measuring device of the lithium battery management system and discharge and recharge identification, described to fill
Electric current amplitude exceed preset value when, monitoring unit and according to charging current amplitude real-time adjustment rectification unit output,
When lithium battery group is fully charged, monitoring unit disconnects charging and discharging circuit.
Optionally, in the control method of described DC power system, the control method of the DC power system is also
Including：When monitoring unit monitors that lithium battery group is fully charged, monitoring unit disconnects remote-controlled folding class switch.
In the DC power system and its control method that the present invention is provided, by setting standby discharge loop simultaneously and filling
Discharge loop, connects the rectification unit and is charged when the lithium cells need to charge by the charging and discharging circuit,
Disconnected with the rectification unit by disconnecting charging and discharging circuit when fully charged；The lithium cells can also be put by standby
Electrical circuit is powered to user load, is realized when the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium electricity
Pool unit first passes through the standby discharge loop and the user load is powered, subsequently again by charging and discharging circuit in the lump to user
Load supplying, solving in the current communications industry DC power system with lithium battery group can not be while realizes fully charged stopping filling
The problem that " zero " interrupts, is that lithium battery is replaced lead-acid battery and is used widely offer Reliable guarantee in the communications industry.
Further, the semiconductor devices that standby discharge loop passes through a unilateral conduction, once realize AC network
Have a power failure and rectification unit voltage of the output voltage less than lithium battery group, standby discharge loop can " zero interrupts " connecting subscribers participating immediately
Load.The present invention only increased diode and remote-controlled folding class switch, nothing on the basis of existing communication power supply electric power-feeding structure
Need complicated hardware circuit and software control, it is possible to realize the mistake flow control of lithium battery and full of the control for stopping filling, and solve
" zero " disruption that conventional lithium battery may occur when discharging, such that it is able to substitute the excessively stream in lithium battery management system and
Stop filling control, simplify the design of battery management system.
Further, since lithium cells are in electric discharge, diode is undertaking whole load current, because itself can produce pressure drop
Influence power supplying efficiency and larger caloric value can be produced.The present invention is detected by monitoring unit can secondary control again after exchange is interrupted
Remote-controlled folding class switch closure is made, the load current of diode is flowed through to bypass, improve system power supply efficiency and diode
Life-span.
Brief description of the drawings
Fig. 1 is the existing DC power system schematic diagram with lead-acid battery；
Fig. 2 is the existing DC power system schematic diagram with lithium battery；
Fig. 3~4 are DC power system schematic diagrames of the present invention；
Fig. 5 is DC power system of the present invention lithium cell charging schematic diagram in the case of normal power supply；
Fig. 6 is that DC power system of the present invention lithium battery in the case of normal power supply stops charging schematic diagram；
Fig. 7 is that lithium battery sparks schematic diagram DC power system of the present invention in case of a fault；
Fig. 8 is DC power system of the present invention lithium battery long-time electric discharge schematic diagram in case of a fault；
Shown in figure：1- Alternating Current Units；2- rectification units；3- Direct Current Distribution Unit；The electric current of 31- discharge and recharges identification
Measurement apparatus；The standby discharge loops of 32-；33- charging and discharging circuits；34- diodes；The remote-controlled folding class switches of 35-；4- monitoring is single
Unit；5- lithium cells；51- lithium battery groups；52- lithium battery management systems；6- user loads.
Specific embodiment
DC power system proposed by the present invention and its control method are made into one below in conjunction with the drawings and specific embodiments
Step is described in detail.According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that, it is attached
Figure using very simplify in the form of and use non-accurately ratio, be only used to conveniently, lucidly aid in illustrating the present invention in fact
Apply the purpose of example.
Core concept of the invention is to provide a kind of DC power system and its control method, to solve existing application
The fully charged problem stopped filling and electric discharge is interrupted with " zero " can not be simultaneously realized in the DC power system of lithium battery group.
To realize above-mentioned thought, the invention provides a kind of DC power system and its control method, the dc source
System is powered for user load, and the DC power system includes Alternating Current Unit, rectification unit, Direct Current Distribution Unit, lithium
Battery unit and monitoring unit, wherein：The monitoring unit is monitored the Alternating Current Unit and lithium cells and monitors whole
Stream unit and the Direct Current Distribution Unit；When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification list
Unit is by the Direct Current Distribution Unit for the user load is powered；In the electricity of the output voltage less than lithium battery group of rectification unit
During pressure, the lithium cells are by the Direct Current Distribution Unit for the user load is powered；The lithium cells pass through
The charging and discharging circuit connects the Direct Current Distribution Unit and is charged by the rectification unit, and the lithium cells are by described
Standby discharge loop and the charging and discharging circuit are powered to the user load.
<Embodiment one>
Fig. 3~4 are DC power system schematic diagrames of the present invention；As shown in figure 3, the DC power system is user load
Power supply, the DC power system includes Alternating Current Unit 1, rectification unit 2, Direct Current Distribution Unit 3, the and of lithium cells 5
Monitoring unit 4, wherein：The Alternating Current Unit 1 connects the rectification unit 2, and the rectification unit 2 connects the direct current and matches somebody with somebody
Electric unit 3, the Direct Current Distribution Unit 3 connects the lithium cells 5 and the user load 6, and the monitoring unit 4 is monitored
The Alternating Current Unit 1 and lithium cells 5 simultaneously monitor rectification unit 2 and the Direct Current Distribution Unit 3；In rectification unit
When output voltage is higher than the voltage of lithium battery group, the rectification unit 2 is the user load by the Direct Current Distribution Unit 3
6 power supplies；When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells 5 are matched somebody with somebody by the direct current
Electric unit 3 is powered for the user load 6；The Direct Current Distribution Unit 3 includes charging and discharging circuit 33 and standby discharge loop 32
With dc bus negative pole, wherein：The charging and discharging circuit 33 and the standby discharge loop 32 are in parallel, and are connected to the lithium electricity
Between pool unit 5 and the dc bus negative pole 6；The lithium cells 5 connect described straight by the charging and discharging circuit 32
Stream bus negative pole is simultaneously charged by the rectification unit 2, and the lithium cells 5 are by the standby discharge loop 32 and described fill
Discharge loop 33 is powered to the user load 6.
Further, the standby discharge loop 32 includes the semiconductor devices of a unilateral conduction.Fig. 4 is of the invention straight
Stream power-supply system schematic diagram, i.e., specific partial circuit diagram, as shown in figure 4, the semiconductor devices of the unilateral conduction is two poles
Pipe 34, the anode of the diode connects the dc bus negative pole, and the negative electrode of the diode connects the negative of lithium cells 5
Pole.Standby discharge loop 32 needs to be disconnected when lithium cells 5 charge and the dc bus negative pole in DC power system 3
Connection, the standby discharge loop 32 is only turned in voltage of the output voltage of rectification unit less than lithium battery group.As long as handing over
The output voltage of stream grid power blackout and rectification unit 2 is less than the voltage of lithium battery group 51, the energy of standby discharge loop 32 " zero interrupts "
Dc bus negative pole is connected immediately and for user load 6 is powered.Below the exactly characteristic of unilateal conduction, unidirectionally leads using possessing
Electrical semi-conducting material such as diode is solved.
Further, the lithium cells 5 include lithium battery group 51 and lithium battery management system 52, the lithium battery
52 pairs of lithium battery groups 51 of management system are monitored.The Direct Current Distribution Unit 3 also includes that the electric current of discharge and recharge identification is surveyed
Amount device 31, the current measuring device 31 of the discharge and recharge identification is returned with charging and discharging circuit 33 and the in parallel of standby discharge loop 32
Road is serially connected between dc bus negative pole and lithium cells 5, and the current measuring device 31 of the discharge and recharge identification is used to monitor
The sense of current and current amplitude.The monitoring unit 4 monitors the electricity of the lithium battery management system 52 and discharge and recharge identification
Flow measuring apparatus 31, when the charging current amplitude exceedes preset value, monitoring unit 4 is according to charging current amplitude real-time adjustment institute
The output of rectification unit 2 is stated, when lithium battery group 51 is fully charged, monitoring unit 4 disconnects charging and discharging circuit 33.The discharge and recharge is returned
Road 33 includes a remote-controlled folding class 35, and the remote-controlled folding class switch 35 is controlled by monitoring unit 4.Lithium battery group 51 is discharged
Afterwards, it is necessary to charge in time.Charging and discharging circuit 33 needs to connect rectification unit 2 when lithium cells 5 charge；Lithium battery group 51 is filled
During full electricity, the connection with rectification unit 2 can be disconnected；During electric discharge, undertaking whole using semi-conducting material in standby discharge loop 32
Individual load current, because that pressure drop itself can be produced to influence power supplying efficiency and larger caloric value can be produced, to improve dc source system
The life-span of semi-conducting material in the power supplying efficiency of system and standby discharge loop 32, charging and discharging circuit 33 can be connected and used in electric discharge
The connection of family load 6, the operating current of semi-conducting material in standby discharge loop 32 is flowed through to bypass.
According to above working characteristics, the use of charging and discharging circuit 33 can be remotely-controlled the switch of folding class, such as contactor or after
Electrical equipment.When charging is required, this switch closure of the control of monitoring unit 4, connects the charging and discharging circuit 33 of lithium battery group 51；It is fully charged
When, monitoring unit 4 controls this to switch off the charging and discharging circuit 33 of lithium battery group 51；When needing electric discharge, the secondary control again of monitoring unit 4
This switch closure is made, the connection of lithium battery group 51 and user load 6 is connected.Remote-controlled folding class switch 35 be D.C. contactor or
Relay.
Specifically, the Direct Current Distribution Unit 3 also includes the current measuring device 31 of discharge and recharge identification, the discharge and recharge is known
Other current measuring device 31 is connected between the user load 6 and the charging and discharging circuit 33, the discharge and recharge identification
Current measuring device 31 is used for monitor current direction and current amplitude.
The present embodiment is solved two problems on the basis of existing communication DC power supply architecture：The standby electric discharge of lithium battery is returned
Road will all the time with the dc bus UNICOM of communication DC power supply；The charging and discharging circuit of lithium battery can according to demand be controlled and communicate straight
Flow the dc bus UNICOM of power supply.Therefore, the scheme that the present embodiment is used be by it is existing fill, standby discharge loop it is same by sharing
Primary Ioops are revised as two different loops of charging and discharging.The present invention relates to stop filling and " zero " interruption to the fully charged of lithium battery
The circuit design and control logic of electric discharge.Supporting lithium battery is needed as back-up source for communication DC power system etc.
In occasion.
<Embodiment two>
Present embodiments provide a kind of control method of DC power system, the control method bag of the direct current component system
Include：The monitoring unit is monitored the Alternating Current Unit and lithium cells and monitors rectification unit and the DC distribution list
Unit；When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit passes through the Direct Current Distribution Unit
For the user load is powered；The rectification unit is connected by the charging and discharging circuit when lithium cells need to charge
Charged, the charging and discharging circuit disconnects with the rectification unit and user load when fully charged；In the defeated of rectification unit
Go out voltage less than lithium battery group voltage when, the lithium cells by the Direct Current Distribution Unit be the user load confession
Electricity；The lithium cells connect the Direct Current Distribution Unit and are charged by the rectification unit by the charging and discharging circuit,
The lithium cells are powered by the standby discharge loop and the charging and discharging circuit to the user load.
Further, when the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells are first led to
Cross the standby discharge loop to power user load, after waiting charging and discharging circuit closure, lithium cells are by standby electric discharge
Loop and charging and discharging circuit are powered to the user load.The standby discharge loop is only less than in the output voltage of rectification unit
Turned on during the voltage of lithium battery group.In the lithium cells, lithium battery management system is monitored to the lithium battery group.
The current measuring device monitor current direction of the discharge and recharge identification and current amplitude.：The monitoring unit monitors the lithium electricity
Pond management system and the current measuring device of discharge and recharge identification, when the charging current amplitude exceedes preset value, monitoring is single
First and the rectification unit according to charging current amplitude real-time adjustment output, when lithium battery group is fully charged, monitoring unit breaks
Open charging and discharging circuit.It is fully charged that the monitoring unit detects the lithium cells, disconnects the remote-controlled folding class switch.
As shown in figure 4, because the unilateral conduction of diode 34 is determined by material itself, without additional control logic
When the output voltage for realizing rectification unit 2 is higher than lithium cells 5, lithium cells 5 will not be electrically charged；In rectification unit output
When voltage is less than lithium cells voltage, lithium cells 5 can power directly to user load 6 immediately, it is only necessary to pair can be distant
Control folding class switch 35 implements necessary control logic.
Fig. 5 is DC power system of the present invention lithium cell charging schematic diagram in the case of normal power supply, as shown in figure 5,
When rectification unit output voltage is higher than lithium cells voltage, such as lithium battery group 51 needs to charge, and monitoring unit 4 can be controlled can be distant
Control folding class switch 35 is closed, and connects the connection with rectification unit 2, and lithium battery group 51 can just be electrically charged.While monitoring unit 4
The measured value of the current measuring device 31 that can be recognized according to discharge and recharge charges electric come the output of real-time control rectification unit 2, limitation
The size of stream, it is ensured that lithium battery group 51 will not be overcharged.
Fig. 6 is that DC power system of the present invention lithium battery in the case of normal power supply stops charging schematic diagram, as shown in fig. 6,
When rectification unit output voltage is higher than lithium cells voltage, such as lithium battery group 51 fills with electricity, and monitoring unit 4 can be controlled
Remote-controlled folding class switch 35 disconnects the connection with rectification unit 2, and the charging and discharging circuit 33 of Direct Current Distribution Unit 3 disconnects, it is ensured that
Lithium battery group 51 in lithium cells 5 stops to fill immediately.
Fig. 7 is that lithium battery sparks schematic diagram DC power system of the present invention in case of a fault, as shown in fig. 7, working as
The moment that AC network has a power failure suddenly, no matter lithium battery management system 52 is either with or without that can detect, because there is depositing for diode 34
, the standby discharge loop 32 that lithium battery group 51 is discharged to user load 6 can be immediately formed, therefore, even if alternating current hit, bear
It is also not in that " zero " interrupts to carry power supply.
Fig. 8 is DC power system of the present invention lithium battery long-time electric discharge schematic diagram in case of a fault, as shown in figure 8,
Lithium cells 5 electric discharge when, diode 34 when whole load current is undertaken, because itself can produce pressure drop influence power supplying efficiency
And larger caloric value can be produced.The remote-controlled folding class of secondary control can be switched again after exchange is interrupted when monitoring unit 4 is detected
35 closures, the load current of diode 34 is flowed through to bypass, and improves the life-span of system power supply efficiency and diode 34.
Visible from the description above, the present invention simply increased diode on the basis of existing communication power supply electric power-feeding structure
34 and remote-controlled folding class switch 35, it is possible to realize the mistake flow control of lithium battery and full of the control for stopping filling, and solve with
" zero " disruption that may occur when being discharged toward lithium battery, such that it is able to substituting the excessively stream in lithium battery management system and stopping filling
Control, simplifies the design of battery management system.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, due to corresponding to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, present invention neck
Any change, modification that the those of ordinary skill in domain does according to the disclosure above content, belong to the protection domain of claims.
Claims (14)
1. a kind of DC power system, the DC power system is powered for user load, it is characterised in that the dc source
System includes Alternating Current Unit, rectification unit, Direct Current Distribution Unit, lithium cells and monitoring unit, wherein：
The Alternating Current Unit connects the rectification unit, and the rectification unit connects the Direct Current Distribution Unit, described straight
Stream power supply unit connects the lithium cells, and the monitoring unit is monitored the Alternating Current Unit and lithium cells and supervised
Control rectification unit and the Direct Current Distribution Unit；
When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit passes through the Direct Current Distribution Unit
For the user load is powered；
When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells are by the DC distribution list
Unit powers for the user load；
The Direct Current Distribution Unit includes charging and discharging circuit, standby discharge loop and dc bus negative pole, wherein：The discharge and recharge
Loop and the standby discharge loop are in parallel, and are connected between the lithium cells and dc bus negative pole；
The lithium cells connect the dc bus negative pole and are charged by the rectification unit by the charging and discharging circuit,
The lithium cells are powered by the standby discharge loop and the charging and discharging circuit to the user load.
2. DC power system as claimed in claim 1, it is characterised in that the standby discharge loop includes a unilateal conduction
The semiconductor devices of property.
3. DC power system as claimed in claim 2, it is characterised in that the semiconductor devices of the unilateral conduction is two
Pole pipe, the anode of the diode connects the dc bus negative pole, and the negative electrode of the diode connects the negative of lithium cells
Pole.
4. DC power system as claimed in claim 3, it is characterised in that the lithium cells include lithium battery group and lithium
Battery management system, the lithium battery management system is monitored to the lithium battery group.
5. DC power system as claimed in claim 4, it is characterised in that the Direct Current Distribution Unit is also known including discharge and recharge
Other current measuring device, the current measuring device of discharge and recharge identification and charging and discharging circuit and standby discharge loop it is in parallel
Loop is serially connected between dc bus negative pole and lithium cells, and the current measuring device of the discharge and recharge identification is used to monitor electricity
Stream direction and current amplitude.
6. DC power system as claimed in claim 5, it is characterised in that the monitoring unit monitors the lithium battery management
System and the discharge and recharge identification current measuring device, the charging current amplitude exceed preset value when, monitoring unit according to
The output of rectification unit described in charging current amplitude real-time adjustment, when lithium battery group is fully charged, monitoring unit disconnects discharge and recharge
Loop.
7. DC power system as claimed in claim 6, it is characterised in that the charging and discharging circuit includes a remote-controlled folding
Class is switched, and the remote-controlled folding class switch is controlled by the monitoring unit.
8. a kind of control method of DC power system, it is characterised in that the control method of the direct current component system includes：
The monitoring unit is monitored the Alternating Current Unit and lithium cells and monitors rectification unit and Direct Current Distribution Unit；
When the output voltage of rectification unit is higher than the voltage of lithium battery group, the rectification unit passes through the Direct Current Distribution Unit
For the user load is powered, the rectification unit is connected by the charging and discharging circuit when lithium cells need to charge
Charged, the charging and discharging circuit disconnects with the rectification unit when fully charged；
Rectification unit output voltage less than lithium battery group voltage when, the lithium cells successively standby are put by described
Electrical circuit and the charging and discharging circuit are powered to user load.
9. the control method of DC power system as claimed in claim 8, it is characterised in that the control of the DC power system
Method processed also includes：When the output voltage of rectification unit is less than the voltage of lithium battery group, the lithium cells first pass through institute
State standby discharge loop to power user load, after waiting charging and discharging circuit closure, lithium cells pass through standby discharge loop
The user load is powered with charging and discharging circuit.
10. the control method of DC power system as claimed in claim 9, it is characterised in that the standby discharge loop is only
Turned on when rectification unit output voltage is less than lithium cells voltage.
The control method of 11. DC power systems as claimed in claim 10, it is characterised in that the DC power system
Control method also includes：In the lithium cells, lithium battery management system is monitored to the lithium battery group.
The control method of 12. DC power systems as claimed in claim 11, it is characterised in that the DC power system
Control method also includes：The current measuring device monitor current direction of the discharge and recharge identification and current amplitude.
The control method of 13. DC power systems as claimed in claim 12, it is characterised in that the DC power system
Control method also includes：The monitoring unit monitors the current measurement dress of the lithium battery management system and discharge and recharge identification
Put, when the charging current amplitude exceedes preset value, monitoring unit and the rectification list according to charging current amplitude real-time adjustment
The output of unit, when lithium battery group is fully charged, monitoring unit disconnects charging and discharging circuit.
The control method of 14. DC power systems as claimed in claim 13, it is characterised in that the DC power system
Control method also includes：When monitoring unit monitors that lithium battery group is fully charged, monitoring unit disconnects remote-controlled folding class switch.
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