CN108183539A - Isolated bidirectional electric automobile charging system and its control method - Google Patents
Isolated bidirectional electric automobile charging system and its control method Download PDFInfo
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- CN108183539A CN108183539A CN201711427697.0A CN201711427697A CN108183539A CN 108183539 A CN108183539 A CN 108183539A CN 201711427697 A CN201711427697 A CN 201711427697A CN 108183539 A CN108183539 A CN 108183539A
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- switching tube
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002441 reversible effect Effects 0.000 claims abstract description 29
- 230000005611 electricity Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 17
- 230000009466 transformation Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
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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
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H02J2007/10—
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a kind of isolated bidirectional electric automobile charging system and its control method, which includes two-way DC/DC circuits and control module, and two-way DC/DC circuits include：First converter unit, including the first bridge arm, the second bridge arm and resonant network, the first bridge arm is in parallel with the second bridge arm, and resonant network is connected respectively with the first bridge arm and the second bridge arm；Transformer, the first side are connected with resonant network；Second converter unit, it is connected respectively with the second side of transformer and power battery, second converter unit includes third bridge arm and four bridge legs, third bridge arm is in parallel with four bridge legs, wherein, control module carries out two-track phase control when two-way DC/DC circuits are in positive charge pattern, to the first converter unit, and the second converter unit is made to carry out uncontrollable rectifier；When two-way DC/DC circuits are in reverse feeding pattern, the second converter unit of control carries out inversion work to control module, and the first bridge arm in the first converter unit is controlled to synchronize rectification work.
Description
Technical field
The present invention relates to electric vehicle engineering field, more particularly to a kind of isolated bidirectional electric automobile charging system and one
The control method of the isolated bidirectional electric automobile charging system of kind.
Background technology
Isolated bidirectional electric automobile charging system mainly includes AC/DC rectification circuits and DC/DC converters.Traditional
In two-way charging system, there are problems that switch tube voltage stress is big, be unable to reverse operation or reverse operation efficiency is low etc., it is difficult to suitable
Answer the requirement that nowadays electric vehicle is fed to power grid.
Invention content
One of the technical issues of the present invention is directed to solve at least to a certain extent in above-mentioned technology.For this purpose, the present invention
One purpose is to propose a kind of isolated bidirectional electric automobile charging system, and switching tube can be realized under positive charge pattern
ZCS shutdown and ZVS it is open-minded, the Sofe Switch of all switching tubes can be realized under reverse feeding pattern, safety and efficiency are equal
It is higher.
Second object of the present invention is to propose a kind of control method of isolated bidirectional electric automobile charging system.
In order to achieve the above objectives, the isolated bidirectional electric automobile charging system that first aspect present invention embodiment proposes,
Including two-way DC/DC circuits and control module, the two-way DC/DC circuits include：First converter unit, first transformation are single
Member includes the first bridge arm, the second bridge arm and resonant network, and first bridge arm is in parallel with second bridge arm, the resonant network
It is connected respectively with first bridge arm and second bridge arm；Transformer, the first side and the resonant network of the transformer
It is connected；Second converter unit, second converter unit is connected respectively with the second side of the transformer and power battery, described
Second converter unit includes third bridge arm and four bridge legs, and the third bridge arm is in parallel with the four bridge legs, wherein, the control
Molding block carries out two-track phase control when the two-way DC/DC circuits are in positive charge pattern, to first converter unit,
And second converter unit is made to carry out uncontrollable rectifier；The control module is in reverse feeding in the two-way DC/DC circuits
During pattern, second converter unit is controlled to carry out inversion work, and control the first bridge arm in first converter unit into
Row synchronous rectification works.
Isolated bidirectional electric automobile charging system according to embodiments of the present invention, two-way DC/DC circuits include first and become
Unit, transformer and the second converter unit are changed, control module is when two-way DC/DC circuits are in positive charge pattern, to first
Converter unit carries out two-track phase control, and the second converter unit is made to carry out uncontrollable rectifier, and reversely feedback is in two-way DC/DC circuits
During power mode, the second converter unit of control carries out inversion work, and the first bridge arm in the first converter unit is controlled to synchronize
Rectification work, as a result, can by transformer to different voltages grade carry out electrical isolation, transformer both sides can realize magnetic coupling from
And realize electric insulation, the safety of system is improved, also, double by being carried out to the first converter unit for including resonant network
Phase shifting control can make high voltage bus side bridge arm switching tube switch stress that can effectively be reduced for high voltage dc bus voltage half
Switching tube parameter request, in addition, under positive charge pattern, switching tube can realize that ZCS is turned off in the second converter unit, first
Switching tube in converter unit can realize that ZVS is open-minded, and under reverse feeding pattern, all switching tubes can realize soft open
It closes, substantially increases the efficiency of system.
In addition, the isolated bidirectional electric automobile charging system proposed according to the above embodiment of the present invention can also have such as
Under additional technical characteristic：
Wherein, first bridge arm includes first switch pipe, second switch pipe, third switching tube and the 4th switch of series connection
Pipe, the DC side of the both ends of first bridge arm as first converter unit, the second switch pipe and the third are opened
There is first node between the pipe of pass；Second bridge arm include series connection the 5th switching tube, the 6th switching tube, the 7th switching tube and
8th switching tube has second node between the 6th switching tube and the 7th switching tube；The resonant network includes the
One inductance, the second inductance and the first capacitance, one end of first inductance are connected with the first node, second inductance
One end is connected with the other end of first inductance, and one end of first capacitance is connected with the other end of second inductance,
The other end of first capacitance is connected with the second node, and the both ends of second inductance are as first converter unit
Exchange side be connected to the first side of the transformer.
Wherein, the third bridge arm includes the 9th switching tube and the tenth switching tube of series connection, the 9th switching tube and institute
Stating has third node between the tenth switching tube；The four bridge legs include the 11st switching tube and the 12nd switch of series connection
Pipe has fourth node, the third node and the described 4th between the 11st switching tube and the 12nd switching tube
Node is connected to the second side of the transformer as the exchange side of second converter unit, and the both ends of the four bridge legs are made
DC side for second converter unit is connected to the power battery.
Further, the two-way DC/DC circuits further include：Drain unit is clamped, the clamp drain unit includes string
The 13rd switching tube and the 14th switching tube of connection, one end connection of the 13rd switching tube and the 14th switching tube of the series connection
To between the first switch pipe and the second switch pipe, the other end be connected to the third switching tube and it is described 4th switch
Between pipe, the clamp drain unit is used for when the two-way DC/DC circuits are in positive charge pattern, and described first is opened
Guan Guan, second switch pipe, third switching tube and the 4th switching tube DC side of the terminal voltage clamp for first converter unit
Input voltage half, and when the two-way DC/DC circuits are in reverse feeding pattern as current by pass.
Further, the two-way DC/DC circuits further include：Second capacitance, second capacitance are attempted by described first
The DC side of converter unit；With described the after third capacitance and the 4th capacitance, the third capacitance and the 4th capacitance series connection
Two capacitances are in parallel, have the 5th node between the third capacitance and the 4th capacitance, and the 5th node is connected to described
Between 13rd switching tube and the 14th switching tube；5th capacitance, the 5th capacitance and the 13rd switching tube connected
It is parallel with one another with the 14th switching tube；6th capacitance, one end of the 6th capacitance are connected to the 5th switching tube and described
Between 6th switching tube, the other end is connected between the 7th switching tube and the 8th switching tube；First diode and
, one two pole in parallel with the 6th capacitance after two diodes, first diode and second Diode series
There is the 6th node, the 6th node is connected with the 5th node between pipe and second diode；7th capacitance, institute
State the DC side that the 7th capacitance is attempted by second converter unit.
According to one embodiment of present invention, when the two-way DC/DC circuits are in positive charge pattern, the control
The control pole of module the to first to the 8th switching tube respectively inputs corresponding switch control signal to control first transformation single
Member carries out rectification work, and the 13rd switching tube and the 14th switching tube is controlled to turn off always, wherein, described first
Switching tube is ahead of the 5th switching tube and the conducting of the first preset phase of the 6th switching tube, and the 4th switching tube is advanced
It is connected in the 7th switching tube and the first preset phase of the 8th switching tube, the second switch pipe and the described 5th switch
Pipe and the 6th switching tube same-phase conducting, the third switching tube and the 7th switching tube and the 8th switching tube are same
Phase conduction differs the second preset phase between the second switch pipe and the 7th switching tube and the 8th switching tube and leads
It is logical, it differs the second preset phase between the third switching tube and the 5th switching tube and the 6th switching tube and is connected.
According to one embodiment of present invention, when the two-way DC/DC circuits are in reverse feeding pattern, the control
Module is controlled according to the resonant frequency of the resonant network to the corresponding switch of control pole input of the 9th to the 12nd switching tube
Signal is to control second converter unit to carry out inversion work, and to first to fourth switching tube in a manner of synchronous rectification
Control pole inputs corresponding switch control signal and the 5th to the 8th switching tube of control turns off always, and to the described 13rd
The control pole of switching tube and the 14th switching tube inputs corresponding switch control signal to realize the two-way flow of energy.
Further, the isolated bidirectional electric automobile charging system further includes AC/DC circuits, the AC/DC electricity
The exchange side on road is connected with three-phase alternating-current supply, and the DC side of the AC/DC circuits becomes in the two-way DC/DC circuits first
The DC side for changing unit is connected.
Further, the control module is when the two-way DC/DC circuits are in positive charge pattern, also described in control
AC/DC circuits carry out three phase full bridge rectification work.
In order to achieve the above objectives, the isolated bidirectional electric automobile charging system that second aspect of the present invention embodiment proposes
Control method, including：When the two-way DC/DC circuits are in positive charge pattern, first converter unit is carried out double
Phase shifting control, and second converter unit is made to carry out uncontrollable rectifier；Reverse feeding pattern is in the two-way DC/DC circuits
When, second converter unit is controlled to carry out inversion work, and it is same that the first bridge arm in first converter unit is controlled to carry out
Walk rectification work.
The control method of isolated bidirectional electric automobile charging system according to embodiments of the present invention, in positive charge pattern
It can realize that ZCS shutdowns and the ZVS of switching tube are open-minded down, can realize that the soft of all switching tubes opens under reverse feeding pattern
It closes, so as to greatly improve the efficiency of system.
Description of the drawings
Fig. 1 is the block diagram according to the isolated bidirectional electric automobile charging system of the embodiment of the present invention；
Fig. 2 is the block diagram according to the isolated bidirectional electric automobile charging system of one embodiment of the invention；
Fig. 3 is the circuit structure diagram according to the isolated bidirectional electric automobile charging system of one embodiment of the invention；
Fig. 4 is in positive charge pattern the according to the isolated bidirectional electric automobile charging system of one embodiment of the invention
The equivalent circuit diagram in one stage；
Fig. 5 is the oscillogram under the positive charge pattern according to one embodiment of the invention；
Fig. 6 is in positive charge pattern the according to the isolated bidirectional electric automobile charging system of one embodiment of the invention
The equivalent circuit diagram of two-stage；
Fig. 7 is in positive charge pattern the according to the isolated bidirectional electric automobile charging system of one embodiment of the invention
Triphasic equivalent circuit diagram；
Fig. 8 is in positive charge pattern the according to the isolated bidirectional electric automobile charging system of one embodiment of the invention
The equivalent circuit diagram in four stages；
Fig. 9 is in positive charge pattern the according to the isolated bidirectional electric automobile charging system of one embodiment of the invention
The equivalent circuit diagram in five stages；
Figure 10 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in positive charge pattern
The equivalent circuit diagram in the 6th stage；
Figure 11 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in positive charge pattern
The equivalent circuit diagram in the 7th stage；
Figure 12 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in positive charge pattern
The equivalent circuit diagram in the 8th stage；
Figure 13 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in positive charge pattern
The equivalent circuit diagram in the 9th stage；
Figure 14 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in positive charge pattern
The equivalent circuit diagram in the tenth stage；
Figure 15 is the isolated bidirectional electric automobile charging system according to one embodiment of the invention in reverse feeding pattern
Equivalent circuit diagram；
Figure 16 is the oscillogram under the high gain mode according to one embodiment of the invention；
Figure 17 is the control strategy schematic diagram under the middle gain mode according to one embodiment of the invention；
Figure 18 is the control strategy schematic diagram under the low gain mode according to one embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The isolated bidirectional electric automobile charging system of the embodiment of the present invention and its controlling party described below in conjunction with the accompanying drawings
Method.
Fig. 1 is the block diagram according to the isolated bidirectional electric automobile charging system of the embodiment of the present invention.
As shown in Figure 1, the isolated bidirectional electric automobile charging system of the embodiment of the present invention, including two-way DC/DC circuits
10 and control module 20, wherein, two-way DC/DC circuits 10 include the first converter unit 11,12 and second converter unit of transformer
13。
Wherein, the first converter unit 11 includes the first bridge arm, the second bridge arm and resonant network, the first bridge arm and the second bridge arm
Parallel connection, resonant network are connected respectively with the first bridge arm and the second bridge arm；First side of transformer 12 is connected with resonant network；Second
Converter unit 13 is connected respectively with the second side of transformer 12 and power battery, and the second converter unit 13 includes third bridge arm and the
Four bridge legs, third bridge arm are in parallel with four bridge legs.
Control module 20 is connected with two-way DC/DC circuits 10, and control module 20 is filled in two-way DC/DC circuits 10 in forward direction
During power mode, two-track phase control is carried out to the first converter unit 11, and the second converter unit 13 is made to carry out uncontrollable rectifier；Control mould
For block 20 when two-way DC/DC circuits 10 are in reverse feeding pattern, the second converter unit 13 of control carries out inversion work, and control
The first bridge arm in first converter unit 11 synchronizes rectification work.
Further, as shown in Fig. 2, isolated bidirectional electric automobile charging system may also include AC/DC circuits 30, AC/
The exchange side of DC circuits 30 is connected with three-phase alternating-current supply (including A, B, C phase), the DC side of AC/DC circuits 30 and two-way DC/
The DC side of first converter unit 11 is connected in DC circuits 10.
Control module 20 is also connected with AC/DC circuits 30, and control module 20 is in positive charge in two-way DC/DC circuits 10
During pattern, also AC/DC circuits 30 is controlled to carry out three phase full bridge rectification work.
As shown in figure 3, AC/DC circuits 30 include three phase rectifier bridge arm, include two rectifier switch pipes per commutating phase bridge arm,
I.e. AC/DC circuits 30 include six rectifier switch pipe VT1~VT6.Node in per commutating phase bridge arm between two rectifier switch pipes
A, B, C phase of three-phase alternating-current supply are connected respectively to, three phase rectifier bridge arm is parallel with one another, and can conduct per the both ends of phase bridge arm
The DC side of AC/DC circuits.
As shown in figure 3, in the first converter unit 11, the first bridge arm includes the first switch pipe M of series connection1, second switch
Pipe M2, third switching tube M3With the 4th switching tube M4, the DC side of the both ends of the first bridge arm as the first converter unit 11, second
Switching tube M2With third switching tube M3Between have first node A.Second bridge arm includes the 5th switching tube M of series connection5, the 6th open
Close pipe M6, the 7th switching tube M7With the 8th switching tube M8, the 6th switching tube M6With the 7th switch M7There is second node B between pipe.
Resonant network includes the first inductance Lr, the second inductance LmWith the first capacitance Cr, the first inductance LrOne end be connected with first node A,
Second inductance LmOne end and the first inductance LrThe other end be connected, the first capacitance CrOne end and the second inductance LmThe other end
It is connected, the first capacitance CrThe other end be connected with second node B, the second inductance LmFriendship of the both ends as the first converter unit 11
Stream side is connected to the first side of transformer 12.The first converter unit 11 that more than circuit element is formed is LLC resonant full bridges electricity
Road.
In the second converter unit 13, third bridge arm includes the 9th switching tube Q of series connection1With the tenth switching tube Q2, the 9th opens
Close pipe Q1With the tenth switching tube Q2Between have third node C.Four bridge legs include the 11st switching tube Q of series connection3With the 12nd
Switching tube Q4, the 11st switching tube Q3With the 12nd switching tube Q4Between have fourth node D, third node C and fourth node D
Exchange side as the second converter unit 13 is connected to the second side of transformer 12, and the both ends of four bridge legs are single as the second transformation
The DC side of member 13 is connected to power battery.The second converter unit 13 that more than circuit element is formed is phase whole-bridging circuit.
As shown in figure 3, two-way DC/DC circuits 10 may also include clamp drain unit 14, clamp drain unit 14 includes string
13rd switching tube M of connection9With the 14th switching tube M10, the 13rd switching tube M of series connection9With the 14th switching tube M10One end
It is connected to first switch pipe M1With second switch pipe M2Between, the other end be connected to third switching tube M3With the 4th switching tube M4It
Between.
In addition, two-way DC/DC circuits 10 may also include the second to the 7th capacitance and the first and second diodes.Wherein,
As shown in figure 3, the second capacitance C0 is attempted by the DC side of the first converter unit 11,
Third capacitance C1With the 4th capacitance C2After series connection with the second capacitance C0Parallel connection, third capacitance C1With the 4th capacitance C2Between
With the 5th node O, the 5th node O is connected to the 13rd switching tube M9With the 14th switching tube M10Between, the 5th capacitance C3With
13rd switching tube M of series connection9With the 14th switching tube M10It is parallel with one another.6th capacitance C4One end be connected to the 5th switching tube
M5With the 6th switching tube M6Between, the other end be connected to the 7th switching tube M7With the 8th switching tube M8Between, the first diode D1With
Second diode D2After series connection with the 6th capacitance C4Parallel connection, the first diode D1With the second diode D2Between have the 6th node,
6th node is connected with the 5th node O.7th capacitance C5It is attempted by the DC side of the second converter unit 13.
Control pole of the control module 20 respectively with the first to the 14th switching tube, six rectifier switch pipes is connected, with respectively
Input corresponding switch control signal.In one embodiment of the invention, the first to the 14th switching tube can be MOSFET
(Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor field-effect are brilliant
Body pipe), rectifier switch Guan Kewei switching transistors, switch control signal can be PWM (Pulse Width Modulation, arteries and veins
Rush width modulated) signal, by inputting pwm signal to each switching tube to control the turn-on and turn-off of each switching tube, so as to
Isolated bidirectional electric automobile charging system is made to realize its corresponding function.
In one embodiment of the invention, when two-way DC/DC circuits 10 are in positive charge pattern, i.e. three-phase alternating current
Power supply through isolated bidirectional electric automobile charging system be power battery charging when, control module 20 can be according to SVPWM (Space
Vector Pulse Width Modulation, space vector pulse width modulation) control of the control method to six rectifier switch pipes
Pole inputs corresponding switch control signal to control AC/DC circuits 30 that the three-phase alternating current of input is converted to direct current respectively.
Meanwhile control module 20 inputs pair respectively according to the control pole of the to first to the 8th switching tube of two-track phase control method
The switch control signal answered.Specifically, to first to the 8th switching tube M respectively of control module 201~M8Control pole input correspond to
Switch control signal with control the first converter unit 11 carry out rectification work.Wherein, the 5th switching tube M5With the 6th switching tube M6
It is same to be conducted, the 7th switching tube M7With the 8th switching tube M8It is same to be conducted, and the 5th switching tube M5, the 6th switching tube M6With the 7th
Switching tube M7, the 8th switching tube M8 for 180 ° it is complementary be connected, can be defined as the benchmark of other switching tube phase shifting controls
Lag pipe.In one embodiment of the invention, first switch pipe M1It is ahead of the 5th switching tube M5With the 6th switching tube M6First
Preset phase θ is connected, the 4th switching tube M4It is ahead of the 7th switching tube M7With the 8th switching tube M8First preset phase θ is connected, with
Adjust the output voltage of the first converter unit 11.Second switch pipe M2With the 5th switching tube M5With the 6th switching tube M6Same-phase is led
It is logical, third switching tube M3With the 7th switching tube M7With the 8th switching tube M8Same-phase is connected, and output voltage is three level waveforms.The
Two switching tube M2With the 7th switching tube M7With the 8th switching tube M8Between differ the second preset phase dFixed phase shifting angleConducting, third switch
Pipe M3With the 5th switching tube M5With the 6th switching tube M6Between differ the second preset phase dFixed phase shifting angleConducting, by second switch pipe
M2With third switching tube M3Realize ZVS (Zero Voltage Switch, zero voltage switch) and the 5th switching tube M5, the 6th switch
Pipe M6With the 7th switching tube M7, the 8th switching tube M8Realize that ZVS is separated.Hereby it is achieved that the double of the first converter unit 11
Phase shifting control.
Also, control module 20 also controls the 13rd switching tube M9With the 14th switching tube M10Always it turns off, so that clamp
Drain unit 14 passes through the 13rd switching tube M when two-way DC/DC circuits 10 are in positive charge pattern9With the 14th switch
Pipe M10Body diode by first switch pipe M1, second switch pipe M2, third switching tube M3With the 4th switching tube M4Terminal voltage pincers
Half of the position for the input voltage of the DC side of the first converter unit 11.
Second preset phase dFixed phase shifting angleIt is fixed, the first change can be adjusted by adjusting the size of the first preset phase θ
Change the voltage value of 11 rectification of unit output, i.e. voltage V between first node A and second node BAB.In order to reduce output voltage
Harmonic content, VABThree level voltage patterns are positively retained at, and V1,0.5V1,0 three kinds of level ratios should be 1:1:1, average electricity
Press function expression as follows：
Wherein, D M1~M8Control pole input switch control signal duty ratio, T be the switch control signal week
Phase, V1The input voltage of DC side for the first converter unit 11.
Further, it can be obtained with reference to correlativity：
Wherein, d1 level、d0.5 levelAnd d0 levelV in a respectively period1、0.5V1, 0 three kinds of level proportion, dDead zoneFor
Switching tube dead time accounting, the duty ratio D of switch control signal can use 0.25~0.5dDead zone, by adjusting the first preset phase
The size adjustable output voltage value of θ.
It is specifically described the control process in each stage when two-way DC/DC circuits 10 are in positive charge pattern below.
As shown in Figure 4 and Figure 5, for first stage (t0~t1), in t0Moment opens MOSFET pipes M1、M2、M7、M8, it is humorous
Shake electric current ipPass through M from input anode1、M2, resonator, M7、M8Returning to input cathode, (thick line represents the portion that electric current flows through in figure
Point, similarly hereinafter), Q1、Q2Body diode conducting, output voltage is by LmIt is clamped with the first side of transformer.Therefore, exciting current im
Linear ascendant trend, UAB=V1, magnetizing inductance LmOn voltage be nV2, LrAnd CrOn voltage be V1-nV2, wherein, V2For
The voltage of power battery, n be transformer the first side and the second side turn ratio, electric current ipIn LrAnd CrBetween resonance occurs, and
And gradually increase according to sine wave.
As illustrated in figures 6 and 5, for second stage (t1~t2), in t1Moment, resonance current ipWith exciting current imPhase
Deng energy is no longer transmitted in the first side of transformer to the second side at this time, and the second side electric current falls to zero, then Q1、Q2Body diode
On electric current natural zero-crossing, almost without reversely restoring process, realize diode ZCS (Zero Current Switch, zero electricity
Stream switch) shutdown, L at this timemIt is no longer clamped by output voltage, with LrAnd CrThree element resonances are formed together.Because LmUsually compare Lr
It is many times greater, so compared to LrAnd CrTwo elements resonance, three element harmonic periods are much bigger, at this time ipHardly change,
Rectification output diode ends, and during this period of time, the energy of load is by output capacitance C5It provides.
As shown in Fig. 7 and Fig. 5, for phase III (t2~t3), in t2Moment, shutdown MOSFET pipes M1、M8, this period
Interior ipIt should be to M1、M8Parasitic capacitance charging, pass through striding capacitance C again3And C4Respectively to M4、M5Parasitic capacitance discharge,
MOSFET pipes M1、M8It is turned off for ZVS.Work as M1、M8The voltage of parasitic capacitance rises to V1When/2, M3And M8Body diode conducting, A
Point voltage UAWith B point voltages UBIt is clamped at zero potential, M1、M8It is clamped at V1/ 2, work as M4、M5Parasitic capacitor voltage all will be
When zero, terminate the stage, be M4、M5It realizes that ZVS is opened to create conditions.
As shown in Fig. 8 and Fig. 5, for fourth stage (t3~t4), in t3Moment, MOSFET pipes M2、M7Shutdown, at this time should
To M2、M7Parasitic capacitance charging, pass through striding capacitance C again3And C4Respectively to M3、M6Parasitic capacitance discharge, MOSFET pipe
Q2、Q7It is turned off for ZVS.Transformer the second side reverse direction current flow, Q3、Q4Body diode conducting, output voltage is by LmAnd transformation
The first side of device clamps, excitation inductance current imLinear decline.Work as M2、M7The voltage of parasitic capacitance rise to V1/2、M3、M6Post
When raw capacitance voltage all will be zero, terminate the stage, be M3、M6It realizes that ZVS is opened to create conditions.
As shown in Fig. 9 and Fig. 5, for the 5th stage (t4~t5), in t4Moment, MOSFET pipes M5、M6、M3、M4Parasitic electricity
The voltage of appearance is all reduced to zero, in this process, resonance current ipFlow through M5、M6、M3、M4Body diode, therefore, M5、M6、M3、
M4Drain electrode and source electrode between voltage be zero.t5Moment opens MOSFET pipes M5、M6、M3、M4, realize that ZVS is open-minded.
As shown in Figure 10 and Fig. 5, for the 6th stage (t5~t6), in t5Moment opens MOSFET pipes M5、M6、M3、M4,
Resonance current ipPass through M from input anode5、M6, resonator, M3、M4Return to input cathode, Q3、Q4Body diode conducting, output
Voltage is by LmIt is clamped with the first side of transformer.Therefore, exciting current ipLinear downward trend, UAB=V1, the electricity on magnetizing inductance
It presses as nV2, LrAnd CrOn voltage be V1-nV2, electric current ipIn LrAnd CrBetween resonance, and L occursmAccording to sine wave by
Gradually decline.
As shown in Figure 11 and Fig. 5, for the 7th stage (t6~t7), in t6Moment, resonance current ipWith exciting current imPhase
Deng energy is no longer transmitted in the first side of transformer to the second side at this time, and the second side electric current falls to zero, then Q3、Q4On body diode
Electric current natural zero-crossing, almost without reversely restoring process, realize rectifier diode ZCS shutdowns, at this time LmNo longer by output electricity
Pressure clamp, LrAnd CrThree element resonances are formed together.Because LmUsually compare LrIt is many times greater, so compared to LrAnd CrTwo elements are humorous
It shakes, three element harmonic periods are much bigger, at this time ipHardly change, rectification output diode cut-off, in this period
Interior, the energy of load is by output capacitance C5It provides.
As shown in Figure 12 and Fig. 5, for the 8th stage (t7~t8), in t7Moment, shutdown MOSFET pipes M5、M4, at this section
Interior ipIt should be to M5、M4Parasitic capacitance charging, pass through striding capacitance C again3And C4Respectively to M1、M8Parasitic capacitance put
Electricity, MOSFET pipes M5、M4It is turned off for ZVS.Work as M5、M4On the voltage of parasitic capacitance V when rising to1/ 2, M4、M7Body diode
Conducting, UAAnd UBIt is clamped at zero potential, M5、M4It is clamped at V1/ 2, work as M1、M8Parasitic capacitor voltage when being all reduced to zero, should
Stage terminates, and is M1、M8It realizes that ZVS is opened to create conditions.
As shown in Figure 13 and Fig. 5, for the 9th stage (t8~t9), in t8Moment, MOSFET pipes M6、M3It turns off, at this time ip
It should be to M6、M3Parasitic capacitance charging, pass through striding capacitance C again3And C4Respectively to M2、M7Parasitic capacitance discharge,
MOSFET pipes M6、M3It is turned off for ZVS.Transformer the second side reverse direction current flow, Q1、Q2Body diode conducting, output voltage will
LmIt is clamped with the first side of transformer, excitation inductance current imLinear rise.Work as M6、M3Parasitic capacitor voltage rise to V1When/2,
M2、M7When parasitic capacitor voltage is all reduced to zero, terminate the stage, be M2、M7It realizes that ZVS is opened to create conditions.
As shown in Figure 14 and Fig. 5, for the tenth stage (t9~t10), in t9Moment, M1、M2、M7、M8The voltage of parasitic capacitance
Zero is all reduced to, resonance current ipFlow through M1、M2、M7、M8Body diode, therefore, M1、M2、M7、M8Drain electrode and source electrode between
Voltage is zero.t10Moment opens MOSFET pipes M1、M2、M7、M8, realize that ZVS is open-minded.
In one embodiment of the invention, when two-way DC/DC circuits 10 are in reverse feeding pattern, i.e. power battery
Through isolated bidirectional electric automobile charging system be 11 DC side rear class of the first converter unit load supplying when, control module 20
With to capacitance C1-C3Charge and discharge electric equilibrium for principle, to realize the Sofe Switch of switching tube, further reduce the switch damage under high frequency
Consumption, using composite control method.Specifically, control module 20 is switched according to the resonant frequency of resonant network to the 9th to the 12nd
Pipe Q1~Q4Control pole input corresponding switch control signal respectively inversion work carried out with the second converter unit 13, and with same
The mode of rectification is walked to first to fourth switching tube M1~M4Control pole input corresponding switch control signal respectively to control
One bridge arm synchronizes rectification work, so as to reduce the 5th to the 8th switching tube M of conduction loss and control5~M8Always it closes
It is disconnected, carry out rectification using its body diode.
Meanwhile control module 20 also according to chopping way to the 13rd switching tube M9With the 14th switching tube M10Control pole
Corresponding switch control signal is inputted respectively to realize the two-way flow of energy, so as to make clamp drain unit 14 in two-way DC/
As current by pass when DC circuits 10 are in reverse feeding pattern.
It, can be by output voltage V when two-way DC/DC circuits 10 are in reverse feeding pattern2With DC bus-bar voltage V1Ratio
Value is defined as yield value, and with series resonance transformer's type seemingly, maximum voltage gain is 1 to the working characteristics of transformer, at this time system
Equivalent circuit is as shown in figure 15.The second side of transformer be input terminal, input voltage V2, the first side of transformer is output
End.There are three kinds of high-gain, middle gain and low gain subpatterns for reverse feeding pattern.Reverse operation existsWhen, transformation
First side of device exists to C1-C3Charge and discharge.In high-gain and low gain subpattern, first half in each switch periods is needed
Period and later half periodSwitching strategies different Shi Caiyong makes capacitor charge and discharge reach balance.In middle gain mould
In formula, to output capacitance C in a switch periods5Charge and discharge can not balance, it is therefore desirable to by adjacent two switches
Different switching strategies is taken to realize the balance of energy in period.
In order to realize ZVS, transformer can be made to be switched between three kinds of subpatterns.High gain mode and middle gain mode
Between the voltage gain of switching point should be between 0.75-0.5；The voltage of switching point increases between middle gain mode and low gain mode
Benefit should be between 0.5-0.25.When voltage gain is identical, the controlled quentity controlled variable α of high gain mode is less than the controlled quentity controlled variable β of middle gain mode,
Similarly the controlled quentity controlled variable β of middle gain mode is less than the controlled quentity controlled variable γ of low gain mode.When controlled quentity controlled variable is smaller, identical voltage gain and
Load under resonance current virtual value it is bigger, caused by conduction loss it is also bigger.Therefore, in order to optimize transformer efficiency, work as height
When gain mode and middle gain mode can realize required voltage gain simultaneously, gain mode in selection；Gain mode in the middle
When can realize required voltage gain simultaneously with low gain mode, low gain mode is chosen.In the selectable range of switching point
Interior, the higher the better for voltage gain.
By can be calculated voltage gain expression formula G under high gain modeH, voltage gain expression formula G under middle gain modeM、
Voltage gain expression formula G under low gain modeLRespectively：
Therefore, output voltage gain is unrelated with load, only changes with the variation of control variable α, β and γ.Cause
This controls variable α, β and γ to adjust converter output voltage by change.
It is specifically described control process when two-way DC/DC circuits 10 are in reverse feeding pattern below.
In the high-gain mode, control strategy during transformer reverse operation high gain mode and waveform are as shown in figure 16,
MOSFET pipes M5~M8Shutdown, the switching frequency of remaining all switching tube are equal to resonant frequency fr.In a switch periods,
VABEqual to 0.5V1, V1, -0.5V1 and-V1.α is M1And M4The duty ratio of the switch control signal of control pole input, passes through control
α adjusts output voltage.Within a cycle of operation, operating status in sharing 6 is specifically described as follows：
For first stage (t0~t1), in t1Moment Q1、Q4、M2、M4、M9Conducting, VAB=0.5V1.Therefore electric current is by M3It posts
Raw capacitance voltage charges to 0.5V1Afterwards, electric current flows through M2Body diode, M2It can realize ZVS.M simultaneously9Both end voltage is in t1Moment
It is clamped on zero, therefore M always before9It can equally realize ZVS.C2、C3It is electrically charged, the two is connected in parallel.
For second stage (t1~t2), in t2Moment M2、Q1And Q4Still keep opening state, M4And M9Shutdown, M1And M10
It is open-minded.Electric current is first to M4And M9Parasitic capacitance charging, therefore M1And M10Turning-on voltage for 0, can realize ZVS.VABIt is equal to
V1, resonance current is in t2Moment becomes 0.
In phase III (t2~t3), resonance current is equal to exciting current, and transformer enters discontinuous operating mode, this time-varying
Depressor the second side electric current can provide energy and make Q for just2And Q3Realize ZVS.
The operation logic in later half the 4th to the 6th stage of period is similar with first to phase III, only current direction phase
Instead, details are not described herein.
Under middle gain mode, asymmetrical control method can be used and carry out balancing capacitance energy.Control strategy such as Figure 17 institutes
Show, Q1~Q4Switching frequency be equal to resonant frequency, M1~M4、M9And M10Switching frequency be consistently equal to the half of resonant frequency,
M5~M8Always it turns off.M4And M9Duty ratio for 0.25, β be M4/M9And Q1/Q4Between phase shifting angle, adjusted by controlling β
Output voltage.Under middle gain mode, M5~M8Always ZCS can be realized, ZVS can be achieved in other all switching tubes.
In the low gain mode, control strategy is as shown in figure 18, VABVoltage under different modalities be respectively 0 and ±
0.5V1.Work as VAB=± 0.5V1When, the output energy of transformer is provided by the power supply of the second side, works as VABWhen=0, transformer it is defeated
Go out energy by C1And C2It provides.Within a cycle of operation, VABFirst half cycle and later half period in operation principle it is symmetrical.It is low
M under gain mode5~M8Always ZCS can be realized, ZVS can be achieved in other all switching tubes.
In conclusion isolated bidirectional electric automobile charging system according to embodiments of the present invention, two-way DC/DC circuits packet
The first converter unit, transformer and the second converter unit are included, control module is in positive charge pattern in two-way DC/DC circuits
When, two-track phase control is carried out to the first converter unit, and the second converter unit is made to carry out uncontrollable rectifier, in two-way DC/DC circuits
During in reverse feeding pattern, the second converter unit of control carries out inversion work, and controls the first bridge in the first converter unit
Arm synchronizes rectification work, can carry out electrical isolation to different voltages grade by transformer as a result, transformer both sides can be real
Existing magnetic coupling improves the safety of system, also, pass through the first transformation to including resonant network so as to fulfill electric insulation
Unit carries out two-track phase control, can make high voltage bus side bridge arm switching tube switch stress for high voltage dc bus voltage half,
Switching tube parameter request can be effectively reduced, in addition, under positive charge pattern, switching tube can be realized in the second converter unit
ZCS is turned off, and the switching tube in the first converter unit can realize that ZVS is open-minded, under reverse feeding pattern, all equal energy of switching tube
It enough realizes Sofe Switch, substantially increases the efficiency of system.
Corresponding above-described embodiment, the present invention also propose a kind of control method of isolated bidirectional electric automobile charging system.
The control method of the isolated bidirectional electric automobile charging system of the embodiment of the present invention, including：In two-way DC/DC electricity
When road is in positive charge pattern, two-track phase control is carried out, and it is whole that the second converter unit is made not controlled to the first converter unit
Stream；When two-way DC/DC circuits are in reverse feeding pattern, the second converter unit of control carries out inversion work, and controls first
The first bridge arm in converter unit synchronizes rectification work.
The specific embodiment of the control method of the isolated bidirectional electric automobile charging system of the embodiment of the present invention can join
According to the embodiment of above-mentioned two-way charging system, to avoid redundancy, details are not described herein.
The control method of isolated bidirectional electric automobile charging system according to embodiments of the present invention, in positive charge pattern
It can realize that ZCS shutdowns and the ZVS of switching tube are open-minded down, can realize that the soft of all switching tubes opens under reverse feeding pattern
It closes, so as to greatly improve the efficiency of system.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, " multiple " are meant that two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of isolated bidirectional electric automobile charging system, which is characterized in that including two-way DC/DC circuits and control module,
The two-way DC/DC circuits include：
First converter unit, first converter unit include the first bridge arm, the second bridge arm and resonant network, first bridge arm
In parallel with second bridge arm, the resonant network is connected respectively with first bridge arm and second bridge arm；
Transformer, the first side of the transformer are connected with the resonant network；
Second converter unit, second converter unit is connected respectively with the second side of the transformer and power battery, described
Second converter unit includes third bridge arm and four bridge legs, and the third bridge arm is in parallel with the four bridge legs,
Wherein, the control module is when the two-way DC/DC circuits are in positive charge pattern, to first converter unit
Two-track phase control is carried out, and second converter unit is made to carry out uncontrollable rectifier；
The control module when the two-way DC/DC circuits are in reverse feeding pattern, control second converter unit into
Row inversion works, and the first bridge arm in first converter unit is controlled to synchronize rectification work.
2. isolated bidirectional electric automobile charging system according to claim 1, which is characterized in that
First bridge arm includes first switch pipe, second switch pipe, third switching tube and the 4th switching tube of series connection, and described the
DC side of the both ends of one bridge arm as first converter unit, has between the second switch pipe and the third switching tube
There is first node；
Second bridge arm includes the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube of series connection, and described the
There is second node between six switching tubes and the 7th switching tube；
The resonant network includes the first inductance, the second inductance and the first capacitance, one end of first inductance and described first
Node is connected, and one end of second inductance is connected with the other end of first inductance, one end of first capacitance and institute
The other end for stating the second inductance is connected, and the other end of first capacitance is connected with the second node, second inductance
Both ends are connected to the first side of the transformer as the exchange side of first converter unit.
3. isolated bidirectional electric automobile charging system according to claim 2, which is characterized in that
The third bridge arm includes the 9th switching tube and the tenth switching tube of series connection, the 9th switching tube and the tenth switch
There is third node between pipe；
The four bridge legs include the 11st switching tube and the 12nd switching tube of series connection, the 11st switching tube and described the
There is fourth node, the friendship of the third node and the fourth node as second converter unit between 12 switching tubes
Stream side is connected to the second side of the transformer, and the both ends of the four bridge legs connect as the DC side of second converter unit
It is connected to the power battery.
4. isolated bidirectional electric automobile charging system according to claim 3, which is characterized in that the two-way DC/DC
Circuit further includes：
Drain unit is clamped, the clamp drain unit includes the 13rd switching tube and the 14th switching tube of series connection, the string
Connection the 13rd switching tube and the 14th switching tube one end be connected between the first switch pipe and the second switch pipe,
The other end is connected between the third switching tube and the 4th switching tube, and the clamp drain unit is used for described two-way
When DC/DC circuits are in positive charge pattern, by the first switch pipe, second switch pipe, third switching tube and the 4th switch
Half of the terminal voltage clamp of pipe for the input voltage of the DC side of first converter unit, and in the two-way DC/
As current by pass when DC circuits are in reverse feeding pattern.
5. isolated bidirectional electric automobile charging system according to claim 4, which is characterized in that the two-way DC/DC
Circuit further includes：
Second capacitance, second capacitance are attempted by the DC side of first converter unit；
, institute in parallel with second capacitance after third capacitance and the 4th capacitance, the third capacitance and the 4th capacitance series connection
State between third capacitance and the 4th capacitance have the 5th node, the 5th node be connected to the 13rd switching tube and
Between 14th switching tube；
5th capacitance, the 5th capacitance and the 13rd switching tube connected and the 14th switching tube are parallel with one another；
6th capacitance, one end of the 6th capacitance are connected between the 5th switching tube and the 6th switching tube, are another
End is connected between the 7th switching tube and the 8th switching tube；
After first diode and the second diode, first diode and second Diode series with the 6th capacitance
Parallel connection, between first diode and second diode have the 6th node, the 6th node with described Section five
Point is connected；
7th capacitance, the 7th capacitance are attempted by the DC side of second converter unit.
6. isolated bidirectional electric automobile charging system according to claim 5, which is characterized in that in the two-way DC/
When DC circuits are in positive charge pattern, the control module respectively the to first to the 8th switching tube control pole input it is corresponding
Switch control signal controls the 13rd switching tube and described the so that first converter unit to be controlled to carry out rectification work
14 switching tubes turn off always, wherein, the first switch pipe is ahead of the 5th switching tube and the 6th switching tube
One preset phase is connected, and the 4th switching tube is ahead of the first preset phase of the 7th switching tube and the 8th switching tube
Conducting, the second switch pipe are connected with the 5th switching tube and the 6th switching tube same-phase, the third switching tube
It is connected with the 7th switching tube and the 8th switching tube same-phase, the second switch pipe and the 7th switching tube and institute
It states and the conducting of the second preset phase, the third switching tube and the 5th switching tube and the described 6th is differed between the 8th switching tube
The conducting of the second preset phase is differed between switching tube.
7. isolated bidirectional electric automobile charging system according to claim 5, which is characterized in that in the two-way DC/
When DC circuits are in reverse feeding pattern, the control module is according to the resonant frequency of the resonant network to the 9th to the 12nd
The control pole of switching tube inputs corresponding switch control signal so that second converter unit to be controlled to carry out inversion work, and with same
It walks the mode of rectification and inputs corresponding switch control signal and control the 5th to the to the control pole of first to fourth switching tube
Eight switching tubes turn off always, and input corresponding switch to the control pole of the 13rd switching tube and the 14th switching tube
Signal is controlled to realize the two-way flow of energy.
8. isolated bidirectional electric automobile charging system according to claim 5, which is characterized in that further include AC/DC electricity
Road, the exchange side of the AC/DC circuits are connected with three-phase alternating-current supply, the DC side of the AC/DC circuits and the two-way DC/
The DC side of the first converter unit is connected in DC circuits.
9. isolated bidirectional electric automobile charging system according to claim 8, which is characterized in that the control module exists
When the two-way DC/DC circuits are in positive charge pattern, the AC/DC circuits is also controlled to carry out three phase full bridge rectification work.
10. a kind of control method of isolated bidirectional electric automobile charging system according to any one of claim 1-9,
It is characterised in that it includes：
When the two-way DC/DC circuits are in positive charge pattern, two-track phase control is carried out to first converter unit, and
Second converter unit is made to carry out uncontrollable rectifier；
When the two-way DC/DC circuits are in reverse feeding pattern, second converter unit is controlled to carry out inversion work, and
The first bridge arm in first converter unit is controlled to synchronize rectification work.
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