CN108649664A - A kind of DC power supply and series-parallel circuit - Google Patents
A kind of DC power supply and series-parallel circuit Download PDFInfo
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- CN108649664A CN108649664A CN201810740570.2A CN201810740570A CN108649664A CN 108649664 A CN108649664 A CN 108649664A CN 201810740570 A CN201810740570 A CN 201810740570A CN 108649664 A CN108649664 A CN 108649664A
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H02J7/022—
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of DC power supply of present invention proposition and series-parallel circuit, circuit includes that circuit includes the first DC/DC converter units and the 2nd DC/DC converter units, to be exported after the DC power conversion by reception；First one way conducting device, one end are electrically connected the first DC/DC converter units, and the other end is electrically connected output cathode end；Selecting unit, its first end is electrically connected the first DC/DC converter units, second end is electrically connected one end of the second one way conducting device, third end is electrically connected output negative pole end, and selecting unit, which receives the instruction of control module and responds the instruction, makes the first DC/DC converter units and electrical series between the 2nd DC/DC converter units or in parallel；The other end of second one way conducting device is electrically connected output cathode end；2nd DC/DC converter units are electrically connected one end of the second one way conducting device and the second end, the 2nd DC/DC converter units are electrically connected output negative pole end.The charging requirement of electric vehicle in the market is compatible with using the DC power supply of the circuit.
Description
Technical field
The present invention relates to a kind of DC power supplies for electric vehicle, more particularly to a kind of DC power supply and connection in series-parallel electricity
Road.
Background technology
Current different types of electric vehicle, charge voltage range is inconsistent, as the chargeable range of passenger car is generally 225
~500Vdc；Mini-bus, bus charge voltage range be 500~900V；And even if same type vehicle, different manufacturers release
The charging voltage of electric vehicle DC fast charge also disunity.
The charging pile of mainstream currently on the market, chargeable range is relatively narrow, can only often take into account Some vehicles, which results in very much
It cannot charge between vehicle and stake, the unmatched problem of knee is very prominent.Moreover, with the continuous increasing of electric vehicle ownership
Add, this contradiction increasingly highlights.
Invention content
Based on the above issues, the purpose of the present invention aims to solve at least one of described technological deficiency.It is proposed a kind of direct current
The series-parallel circuit in source can greatly increase the output voltage range and constant power output of DC voltage using the circuit
The output voltage range for the DC power supply for sampling the circuit is expanded to 225~900Vdc by voltage range；It is compatible in this way
All electric vehicle charging requirements in the market.To achieve the above object, the present invention adopts the following technical scheme that：
A kind of series-parallel circuit of DC power supply, which is characterized in that including：First DC/DC converter units and the 2nd DC/DC
Converter unit, to be exported after the DC power conversion by reception；First one way conducting device, one end are electrically connected described first
DC/DC converter units, the other end are electrically connected output cathode end；Selecting unit, first end are electrically connected the first DC/DC
Converter unit, second end are electrically connected one end of the second one way conducting device, third end and are electrically connected output negative pole end, the choosing
Selecting unit and receiving the instruction of control module and respond described instruction makes the first DC/DC converter units and the 2nd DC/DC convert list
Electrical series or parallel connection between member；The other end of second one way conducting device is electrically connected output cathode end；2nd DC/
DC converter units are electrically connected one end and the second end, the 2nd DC/DC transformation lists of second one way conducting device
Member is electrically connected output negative pole end.
Preferably, the selection unit includes single-pole double-throw switch (SPDT) relay；Wherein, the single-pole double-throw switch (SPDT) relay closes
When together in the second end, electrical series between the first DC/DC converter units and the 2nd DC/DC converter units；The single-pole double throw
When switch relay is closed to the third end, the first DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units.
Preferably, which includes that first one way conducting device is the first diode, and anode tap is electrically connected institute
The first output end of the first DC/DC converter units is stated, cathode terminal is electrically connected output cathode end；The second one-way conduction device
Part is the second diode, and anode tap is electrically connected the first output end of the second end and the 2nd DC/DC converter units,
Its cathode terminal is electrically connected output cathode end.
Preferably, the selection unit includes first switch, second switch；The first end of the first switch is electrically connected institute
State the first end of second switch and the second output terminal of the first DC/DC converter units, the second end electricity of the first switch
Property connect the anode tap of second diode, the second end of the second switch is electrically connected output negative pole end, wherein described
When first switch is closed, electrical series between the first DC/DC converter units and the 2nd DC/DC converter units, the second switch closes
When conjunction, the first DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units.
Preferably, the first switch, the second switch include relay.
Preferably, the control module be electrically connected the first DC/DC converter units, the 2nd DC/DC converter units,
The selecting unit；Information of voltage of the control module based on reception controls the selecting unit, if the information of voltage is small
In equal to given threshold, the circuit is in the first operating mode, the first DC/DC converter units and the 2nd DC/DC
Electrical series between converter unit, it is described when the circuit is in the second operating mode if the information of voltage is more than given threshold
It is electrically in parallel between first DC/DC converter units and the 2nd DC/DC converter units.
Preferably, the circuit, when being in first operating mode, the first DC/DC converter units and described second
Electrical series between DC/DC converter units, second one way conducting device by.
Preferably, which also includes capacitance, and one end is electrically connected the output cathode end, and the other end is electrically connected
The output negative pole end.
The embodiment of the present invention also provides a kind of DC power supply, which is characterized in that is converted including first order converter, the second level
Device, the input terminal of the second level converter are electrically connected the output end of first order converter；The first order converter is used for
It is direct current by the convert alternating current of input, the second level converter includes the electricity as described in any one of claim 1 to 7
Road.
Preferably, DC power supply, which is characterized in that further include voltage identification module, be electrically connected control module, use
To obtain the information of voltage of electric vehicle to be charged and feed back to the control module, if the information of voltage is less than or equal to setting
Threshold value, the first DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units；If the information of voltage is big
The electrical series between given threshold, the first DC/DC converter units and the 2nd DC/DC converter units.Pass through control in this way
The operating mode of selecting unit control circuit processed.
Preferably, which further includes：Human-computer interaction module, it is input by user about charging voltage letter for receiving
Control module is ceased and is transmitted to, the charging voltage information of the control module based on acquisition controls the Working mould of the circuit
Formula, wherein when the circuit is in the first operating mode, the first DC/DC converter units and the 2nd DC/DC transformation are single
Electrical series between member, when the circuit is in the second operating mode, the first DC/DC converter units and the 2nd DC/DC
It is electrically in parallel between electrical series between converter unit.
Scheme in compared with the existing technology, advantages of the present invention：
The circuit that the embodiment of the present invention proposes can widen the output voltage range and constant power output of DC voltage
Voltage range, the circuit widen the output voltage range of DC power supply to 225~900Vdc；It is compatible with so in the market
All electric vehicle charging requirements.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and embodiments：
Fig. 1 is existing charge power supply DC/DC inverter functionality module diagrams；
Fig. 2-4 is the functional block diagram of the charge power supply DC/DC converter circuits of one embodiment of the invention；
Fig. 5-7 is the functional block diagram of the charge power supply DC/DC converter circuits of another embodiment of the present invention；
Fig. 8-9 is the functional block diagram that the DC/DC converters of the embodiment of the present invention are connect with power supply.
Specific implementation mode
Said program is described further below in conjunction with specific embodiment.It should be understood that these embodiments are for illustrating
The present invention and be not limited to limit the scope of the invention.The implementation condition used in embodiment can be done such as the condition of specific producer into
One successive step, the implementation condition being not specified are usually the condition in routine experiment.
This application discloses the voltages of a kind of DC power supply, output can meet wanting for different types of Vehicular charging voltage
It asks, illustrates below：
It is existing charge power supply DC/DC inverter functionality module diagrams as shown in Figure 1, which includes 1
DC/DC converters.When the output voltage range of charge power supply is narrow, the topology meets charging requirement well, if applied to output
The component design amount of redundancy of the topology is big when voltage range wide field is closed, and leads to the of high cost of charge power supply.Assuming that charging electricity
Source demand power is 10KW, and according to the knot topology structure of Fig. 1, a charge power supply will be in 225~900VDC output voltage ranges
The output for meeting 10KW, under the conditions of minimum voltage 225V, output maximum current is 44.4A；Therefore, the charging of program topology
The maximum design power of power supply will be similar to 44.4A*900V=40KW；Therefore, the cost of this scheme is very high, is unfavorable for charging
More applications of power supply.
Next the mode that the description present invention is implemented, a kind of series-parallel circuit of DC power supply, including：2 DC/DC transformation
Unit, to export the DC power conversion received afterwards (to preset voltage)；Selecting unit is electrically connected DC/DC transformation
Unit, the selection unit, which receives the instruction of control module and responds the instruction, makes the first DC/DC converter units and the 2nd DC/DC
Electrically (electrical series are electrically in parallel so that output voltage matched load, such as electronic vapour to be charged for combination between converter unit
Vehicle), the first one way conducting device, one end is electrically connected DC/DC converter units, and the other end is electrically connected the output cathode
End, the second one way conducting device one end are electrically connected selecting unit, and the other end is electrically connected the output cathode end and (unidirectionally leads
Logical device be configured to electric current through the one way conducting device to load-side flow, and cannot from load through the one way conducting device to
It flows DC/DC converter units side)；Circuit has 2 kinds of operating modes by the selection unit, i.e. between 2 DC/DC converter units electrically
It is electrically in parallel between series connection or 2 DC/DC converter units.In present embodiment, the second one way conducting device is converted in DC/DC
When electrically in parallel between unit, provide unidirectional current path, between 2 DC/DC converter units when electrical series by.Output electricity
Pressure refers to the voltage between output cathode end and output negative pole end.DC power supply connect with electric vehicle after obtain information of voltage (and its
Its parameter), which is that the prior art is not developed in details herein.In present embodiment, 2 DC/DC converter units
Between be electrically connected refer to DC/DC transformation outlet chamber be electrically connected, supplying power for outside after electric connection.Each DC/DC converter units
With the first output end (e.g., positive), second output terminal (e.g., cathode), when connection, is electrically connected according to polarity.Series connection can be stated
It is electrically connected for the second end of the first DC/DC converter units and the first end of the 2nd DC/DC converter units, the first DC/DC transformation
The first end connection output cathode end of unit, the second end connection output negative pole end of the 2nd DC/DC converter units；Parallel connection can be stated
It is electrically connected and is electrically connected to defeated for the first end of the first DC/DC converter units and the first end of the 2nd DC/DC converter units
Go out positive terminal；The second end of first DC/DC converter units and the second end of the 2nd DC/DC converter units are electrically connected and electrically connect
It is connected to output negative pole end.2 DC/DC converter units itself are independent from each other, and are run respectively according to the instruction of control module.It should
The information of voltage control selections unit of the control module also load based on reception so that combination output between DC/DC converter units
Voltage meets the requirement of load.Such as, the information of voltage of load is less than or equal between 2 DC/DC converter units of given threshold electrically simultaneously
Connection is more than electrical series between 2 DC/DC converter units of given threshold.
Next the charge power supply DC/DC converter circuits of one embodiment of the invention are described in conjunction with Fig. 2-4；Such as Fig. 2 institutes
Charge power supply DC/DC converter circuit high-level schematic functional block diagrams are shown as, circuit 10 includes：First DC/DC converter units 11, second
DC/DC converter units 12, selecting unit 13, the first diode 14, the second diode 15；The of first DC/DC converter units 11
One output end is electrically connected to the anode tap of the first diode 14, and the second output terminal of the first DC/DC converter units 11 electrically connects
It is connected to the first end of selecting unit, the ends a of selecting unit are electrically connected the anode tap of the second diode 15, the second diode 15
Cathode terminal is electrically connected the cathode terminal of the first diode 14 and output cathode end, the ends b (i.e. third end) of selecting unit electrically connect
Connect output negative pole end；First output end of the 2nd DC/DC converter units 12 be electrically connected to the second diode 15 anode tap and
The second output terminal of second end (ends a), the 2nd DC/DC converter units 12 is electrically connected output negative pole end；Selecting unit is in the
(second end closure), electrical series (such as Fig. 3 between the first DC/DC converter units and the 2nd DC/DC converter units when one operating mode
It is shown), when being in the second operating mode (third end closure), the first DC/DC converter units and the 2nd DC/DC converter units
Between (as shown in Figure 4) electrically in parallel.Design in this way can greatly increase the output voltage range of DC voltage, and
The output voltage range of DC power supply is expanded to 225~900Vdc while having high sexual valence by the voltage range of constant power output
Than.All electric vehicle charging requirements in the market can be compatible with using the power supply of the program.Program topology is simple, cost performance.
It uses 2 one way conducting devices, i.e. 2 diodes 14,15；Wherein the first DC/DC converter units and the 2nd DC/DC transformation are single
Between member when electrical series, diode 14 is connected, and diode 15 ends, and the topology of simplified control circuit (uses diode in place relay
Device switchs, and reduces the control complexity of circuit).First DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units
When, diode 14 is connected, and diode 15 is connected.
In above-mentioned embodiment, selecting unit 13 includes single-pole double-throw switch (SPDT), is specifically single-pole double-throw relay.
Power supply using the above scheme also includes a control module, and it is single which is electrically connected the first DC/DC transformation
First 11, the 2nd DC/DC converter units 12, selecting unit 13；The control module is also electrically connected external loading and (such as connects to be charged
Electric vehicle) carry out Signalling exchange (e.g., obtain output voltage information), control module controls the first DC/ according to the information of voltage
DC converter units 11, the 2nd DC/DC converter units 12, selecting unit 13 export corresponding voltage and current in turn.
Next the charge power supply DC/DC converter circuits of another embodiment of the present invention are described in conjunction with Fig. 5-7；Such as Fig. 5
Charge power supply DC/DC converter circuit high-level schematic functional block diagrams are shown, circuit 20 includes：First DC/DC converter units 21,
Two DC/DC converter units 22, the first diode 24, the second diode 25, selecting unit 23 include that first switch 23a, second open
Close 23b；First output end of the first DC/DC converter units 21 is electrically connected to the anode tap of the first diode 24, the first DC/DC
The second output terminal of converter unit 21 is electrically connected to one end of first switch 23a and one end of second switch 23b, first switch
The other end of 23a is electrically connected the anode tap of the second diode 24, and the cathode terminal of the second diode 25 is electrically connected the one or two pole
The other end at the cathode terminal of pipe 24 and output cathode end, second switch 23b is electrically connected output negative pole end；2nd DC/DC is converted
First output end of unit 22 is electrically connected to the other end of first switch 23a and the anode tap of the second diode 25, the 2nd DC/
The second output terminal of DC converter units 22 is electrically connected output negative pole end；Wherein, when first switch 23a is closed, the first DC/DC becomes
Electrical series (as shown in Figure 6) between unit 21 and the 2nd DC/DC converter units 22 are changed, when second switch 23b is closed, the first DC/
It is electrically in parallel (as shown in Figure 7) between DC converter units 21 and the 2nd DC/DC converter units 22.Using the effect of the program with above-mentioned
Described in scheme, it is not repeated to illustrate herein.In the present solution, first switch 23a, second switch 23b are relay.The program is opened up
It flutters simple, uses 2 one way conducting devices, i.e. 2 diodes 24,55, with also having except counterflow-preventing function, first
Between DC/DC converter units and the 2nd DC/DC converter units when electrical series, diode 14 is connected, and diode 25 ends.First
When electrically in parallel between DC/DC converter units and the 2nd DC/DC converter units, diode 14 is connected, and diode 15 is connected.Using this
The power supply of scheme also includes a control module, and action ibid is not repeated to describe.One end of first switch 23a and second switch
One end of 23b is equivalent to the first end of selecting unit in Fig. 2 schemes after being electrically connected, which is electrically connected the first DC/DC transformation
The second output terminal of unit, the other end of first switch 23a are equivalent to the second end of selecting unit in Fig. 2 schemes, first switch
The other end of 23b is equivalent to third end.
In the present solution, assuming that the output voltage of the first DC/DC converter units 21 is V1, the 2nd DC/DC converter units 22 are
V2, output voltage (voltage between output cathode end and output negative pole end) are Vo,
When first mode (as shown in Figure 6), first switch 23a is closed, and second switch 23b is disconnected, output voltage Vo=V1+
V2, action process, SW1 are closed, Vc=Vb=V2, Va=Vc+V1=V2+V1, due to Va>Vb, the conducting of the first diode 21,
Second diode 22 ends；Vo=Va=V2+V1 at this time, (being chosen in this programme, V1=V2).(such as Fig. 7 institutes when second mode
Showing) first switch 23a disconnects, and second switch 23b is closed, the conducting of the first diode 21, and the conducting of the second diode 22 exports at this time
Voltage Vo=V1=V2, output current be the first DC/DC converter units 21 and 22 output current of the 2nd DC/DC converter units it
With.The impedance very little of switch, conduction voltage drop can be ignored.
In the circuit of said program, including 2 DC/DC converter units, it is assumed that the maximum output voltage of charge power supply is Vo,
Operating current under maximum output voltage is Io, and the maximum output voltage of 2 DC/DC converter units design is Vo/2, minimum defeated
It is Vo/4 to go out voltage；In order to ensure full voltage range full power, the maximum output current of 2 DC/DC converter units is 2Io.Appoint
It is so described for 10KW with charge power supply demand power, charge power supply is realized in 225~900VDC output voltage ranges
10KW is exported；According to embodiment of the present invention, the output voltage range of each DC/DC converter units is 225~450VDC, maximum
Electric current is 22.2A；The design general power of entire charge power supply is 2*450*22.2=20KW, is far below scheme as shown in Figure 1
(40KW), greatly reduces system cost in this way.
In one embodiment, when output voltage is less than or equal to given threshold (e.g., 450V), two 2 DC/DC transformation
Unit parallel way, the output maximum output current of charge power supply is 44.4A at this time.Under the conditions of 225V, output current is
44.4A realizes 10KW outputs；Under the conditions of 450V, output current 22.2A realizes 10KW outputs.
In one embodiment, when output voltage is more than given threshold (such as 450V or other values, depending on the field applied
Close) when, two 2 DC/DC converter unit series systems, the output maximum output current of charge power supply is 22.2A at this time.
Under the conditions of 450V, output current 22.2A realizes 10KW outputs；Under the conditions of 900V, output current 11.1A realizes 10KW
Output.
In one embodiment, two 2 DC/DC converter units are connected to same power supply, as shown in Figure 8.
In one embodiment, two 2 DC/DC converter units are respectively connected to independent power supply, as shown in Figure 9.
In one embodiment, which also includes capacitance, and one end is electrically connected the output cathode end, the other end
It is electrically connected the output negative pole end.
In one embodiment, control module is electrically connected the first DC/DC converter units, the 2nd DC/DC converter units, choosing
Select unit；The information of voltage (information of voltage of electric vehicle to be charged) of control module response reception simultaneously triggers the selection list
Member (and sending out instruction to selecting unit, selecting unit responds the instruction), wherein when the circuit is in the first operating mode,
The first DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units；When in the second operating mode, institute
It states electrical between the first DC/DC converter units and the 2nd DC/DC converter units and connects.
In one embodiment, include 2 stage converter using (direct current) power supply of above-mentioned implementing circuit：The first order converts
The input terminal of device and second level converter, second level transformation is electrically connected the output end of first order converter, first order transformation
The convert alternating current that device is used to input is direct current；Second level converter includes such as circuit among the above.Here alternating current can
Think three-phase 220V or 380V alternating current.In a preferred embodiment, first order converter includes circuit of power factor correction,
Circuit of power factor correction is for correcting power factors and carries out rectification.In one embodiment, circuit of power factor correction
May include the full-bridge circuit being made of 6 IGBT or metal-oxide-semiconductor, the control pole of each IGBT or metal-oxide-semiconductor is by pulse-width signal control
System.The voltage transformation for the direct current that second level converter is used to export in first order converter charges straight at suitable electric vehicle
Galvanic electricity pressure.
In one embodiment, using above-mentioned implementing circuit DC power supply, further include：Voltage identification module, electrically connects
Control module is connect, the charging voltage information of electric vehicle to be charged is obtained when DC power supply is connected with electric vehicle to be charged and is fed back
To control module, control module receives the information and sends out the instruction for responding the information of voltage to selecting unit, the selection unit
It receives the instruction and responds the instruction and make between the first DC/DC converter units and the 2nd DC/DC converter units electrical series or simultaneously
Connection.In present embodiment, the information of voltage is electrically in parallel less than or equal between given threshold then 2 DC/DC converter units, if voltage
Information is more than electrical series between 2 DC/DC converter units of given threshold.
In one embodiment, using the DC power supply of the above embodiment circuit, further include：Human-computer interaction module is used
It is input by user about charging voltage information in receiving；Control module receives the information and sends out the instruction for responding the information of voltage
To selecting unit, the selection unit, which receives the instruction and responds the instruction, makes the first DC/DC converter units and the 2nd DC/DC become
Change electrical series or parallel connection between unit.In present embodiment, which is less than or equal to given threshold then 2 DC/DC transformation
It is electrically in parallel between unit, if information of voltage is more than electrical series between 2 DC/DC converter units of given threshold.
In one embodiment, voltage identification module, control module, man-machine using the DC power supply of above-mentioned implementing circuit
Interactive module can be arranged and/or be integrated in above-mentioned circuit.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
It is to can understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention.All such as present invention essences
The equivalent transformation or modification that refreshing essence is done, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of series-parallel circuit of DC power supply, which is characterized in that including the first DC/DC converter units and the 2nd DC/DC become
Unit is changed, to be exported after the DC power conversion by reception；First one way conducting device, one end are electrically connected described first
DC/DC converter units, the other end are electrically connected output cathode end；Selecting unit, first end are electrically connected the first DC/DC
Converter unit, second end are electrically connected one end of the second one way conducting device, third end and are electrically connected output negative pole end, the choosing
Selecting unit and receiving the instruction of control module and respond described instruction makes the first DC/DC converter units and the 2nd DC/DC convert list
Electrical series or parallel connection between member；The other end of second one way conducting device is electrically connected output cathode end；2nd DC/
DC converter units are electrically connected one end and the second end, the 2nd DC/DC transformation lists of second one way conducting device
Member is electrically connected output negative pole end.
2. circuit as described in claim 1, which is characterized in that
First one way conducting device includes the first diode, and anode tap is electrically connected the first DC/DC converter units
The first output end, cathode terminal is electrically connected output cathode end；
Second one way conducting device includes the second diode, and anode tap is electrically connected the second end and described second
First output end of DC/DC converter units, cathode terminal are electrically connected output cathode end.
3. circuit as claimed in claim 2, which is characterized in that selecting unit include single-pole double-throw switch (SPDT) relay, first
End is electrically connected the second output terminal of the first DC/DC converter units, second end be electrically connected the second diode anode tap,
Third end is electrically connected output negative pole end, and the second output terminal of the 2nd DC/DC converter units is electrically connected output negative pole end,
Wherein, when the single-pole double-throw switch (SPDT) relay is closed to the second end, the first DC/DC converter units and the 2nd DC/DC become
Change electrical series between unit；When the single-pole double-throw switch (SPDT) relay is closed to the third end, the first DC/DC converter units with
It is electrically in parallel between 2nd DC/DC converter units.
4. circuit as claimed in claim 2, which is characterized in that the selecting unit includes first switch, second switch；It is described
The first end of first switch is electrically connected the first end of the second switch and the second output of the first DC/DC converter units
It holds, the second end of the first switch is electrically connected the anode tap of second diode, the second end electricity of the second switch
Property connection output negative pole end, the second output terminal of the 2nd DC/DC converter units is electrically connected output negative pole end, wherein institute
When stating first switch closure, electrical series between the first DC/DC converter units and the 2nd DC/DC converter units, the second switch
When closure, the first DC/DC converter units are electrically in parallel between the 2nd DC/DC converter units.
5. circuit as claimed in claim 4, which is characterized in that the first switch, the second switch include relay.
6. circuit as described in claim 1, which is characterized in that the control module is electrically connected the first DC/DC transformation
Unit, the 2nd DC/DC converter units, the selecting unit；Information of voltage of the control module based on reception controls institute
Selecting unit is stated, if the information of voltage is less than or equal to given threshold, the circuit is in the first operating mode, described first
It is electrically in parallel between DC/DC converter units and the 2nd DC/DC converter units；If the information of voltage is more than given threshold, institute
When stating circuit and being in the second operating mode, electrically gone here and there between the first DC/DC converter units and the 2nd DC/DC converter units
Connection.
7. circuit as claimed in claim 6, which is characterized in that when being in second operating mode, the first DC/DC becomes
Change electrical series between unit and the 2nd DC/DC converter units, second one way conducting device by.
8. the circuit as described in any one of claim 2-7, which is characterized in that also include capacitance, one end is electrically connected
The output cathode end, the other end are electrically connected the output negative pole end.
9. a kind of DC power supply, which is characterized in that including first order converter, second level converter, the second level converter
Input terminal be electrically connected first order converter output end；The first order converter is used for the convert alternating current of input
Direct current, the second level converter include the circuit as described in any one of claim 1 to 7.
10. DC power supply as claimed in claim 9, which is characterized in that further include voltage identification module, be electrically connected control
Module, to obtain the information of voltage of electric vehicle to be charged and feed back to the control module, the control module is based on connecing
The information of voltage of receipts controls the selecting unit, if the information of voltage is less than or equal to given threshold, the first DC/DC transformation
It is electrically in parallel between unit and the 2nd DC/DC converter units；If the information of voltage is more than given threshold, the first DC/
Electrical series between DC converter units and the 2nd DC/DC converter units.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810740570.2A CN108649664A (en) | 2018-07-07 | 2018-07-07 | A kind of DC power supply and series-parallel circuit |
| PCT/CN2018/109367 WO2020010729A1 (en) | 2018-07-07 | 2018-10-08 | Direct-current power supply and series and parallel circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810740570.2A CN108649664A (en) | 2018-07-07 | 2018-07-07 | A kind of DC power supply and series-parallel circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108649664A true CN108649664A (en) | 2018-10-12 |
Family
ID=63750691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810740570.2A Pending CN108649664A (en) | 2018-07-07 | 2018-07-07 | A kind of DC power supply and series-parallel circuit |
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| Country | Link |
|---|---|
| CN (1) | CN108649664A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113841316A (en) * | 2021-02-05 | 2021-12-24 | 华为数字能源技术有限公司 | Charging circuit and charging device |
| EP4057492A1 (en) * | 2021-03-12 | 2022-09-14 | Siemens Aktiengesellschaft | Configurable power converter for charging an electric vehicle |
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Application publication date: 20181012 |