CN106685040B - Charger and its charging method and device and electric car - Google Patents
Charger and its charging method and device and electric car Download PDFInfo
- Publication number
- CN106685040B CN106685040B CN201611192572.XA CN201611192572A CN106685040B CN 106685040 B CN106685040 B CN 106685040B CN 201611192572 A CN201611192572 A CN 201611192572A CN 106685040 B CN106685040 B CN 106685040B
- Authority
- CN
- China
- Prior art keywords
- voltage
- constant
- charger
- power
- obtains
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 44
- 230000006837 decompression Effects 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims description 60
- 230000005611 electricity Effects 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012885 constant function Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H02J2007/10—
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using 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
- Y02T10/70—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
- Y02T10/80—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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of charger and its charging methods and device and electric car.The charging method of the charger includes: to carry out exchange to the AC-input voltage of charger to turn DC converting, obtains the first constant DC voltage；Boosting inverter is carried out to the first constant DC voltage, obtains the second constant DC voltage, wherein the corresponding power of the first constant DC voltage power corresponding with the second constant DC voltage is firm power；Decompression transformation is carried out to the second constant DC voltage, obtains DC output voltage；The average anode current under firm power is obtained according to DC output voltage；According to DC output voltage and average anode current, firm power is obtained.Through the invention, the charging cost for reducing charger has been achieved the effect that.
Description
Technical field
The present invention relates to field of power electronics, in particular to a kind of charger and its charging method and device and electricity
Electrical automobile.
Background technique
Currently, charger can be used in the charging of electric bus and small-sized electric vehicle.Due to electric bus and small-sized
The cell voltage grade of electric car is different, and charger is separately designed for electric bus and compact car, and there is presently no energy
The cell voltage platform for enough covering bus and compact car, that is, the charger of bus and compact car can not be general.Fig. 1 is
According to the schematic diagram of one of the relevant technologies charger power vs. voltage curve.As shown in Figure 1, DC charging motor can export
Wider voltage range can theoretically export 0 to the free voltage between voltage rating, still, with the drop of output voltage
Low, also linear decline is then not achieved nominal defeated the output power of charger when output voltage is lower than below voltage rating therewith
Power out, to not be able to satisfy the charging requirement of the electric car of more high-power range.For example, when output voltage range exists
The charger of 200V-750V, rated power 60KW, since maximum current is limited in rated current 80A, then when output voltage is
When 750V, obtaining output power is 60KW, and when output voltage is 600V, obtaining output power is 48KW, when output voltage is
When 400V, obtaining output power is 32KW, and when output voltage is 200V, obtaining output power is only 16KW, is much reached in this way
Less than nominal output power 60KW power output, it is not able to satisfy the charging requirement of electric car.
If according to the design scheme of traditional charger, it is desirable to 60KW constant power output is realized, that is, being in output voltage
Still 60KW power is exported when 200V, then 300A will be reached by exporting electric current, and all device current parameters in such charger inside are all
It to be designed according to 300A, and voltage parameter still will be designed according to 750V, the cost and 750V*300A=of last charger
The cost of the charger of 225KW is identical, this undoubtedly considerably increases the charging cost of charger.In addition, being in nominal power
In the case where output power is 60KW, efficiency will be also greatly lowered for the charger work of 225KW.
For the big problem of the charging cost of charger in the prior art, currently no effective solution has been proposed.
Summary of the invention
The main purpose of the present invention is to provide a kind of charger and its charging methods and device and electric car, at least
Solve the problems, such as that the charging cost of charger is big.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of charging method of charger.This is filled
Method for electrically includes: to carry out exchange to the AC-input voltage of charger to turn DC converting, obtains the first constant DC voltage；To
One constant DC voltage carries out boosting inverter, obtains the second constant DC voltage, wherein the corresponding function of the first constant DC voltage
Rate power corresponding with the second constant DC voltage is firm power；Decompression transformation is carried out to the second constant DC voltage, is obtained
DC output voltage；The average anode current under firm power is obtained according to DC output voltage；According to DC output voltage and
Average anode current obtains firm power.
Further, boosting inverter is carried out to the first constant DC voltage, obtaining the second constant DC voltage includes: to obtain
The electric current minimum limit value of charger；The voltage greatest limit of charger is determined according to firm power and electric current minimum limit value
Value；First constant DC voltage is boosted into voltage maximum limit, wherein the second constant DC voltage includes voltage maximum pole
Limit value.
Further, boosting inverter is carried out to the first constant DC voltage, obtaining the second constant DC voltage includes: to obtain
For adjusting the transformer voltage ratio of the first constant DC voltage；Second is obtained according to the first constant DC voltage and transformer voltage ratio
Constant DC voltage.
Further, decompression transformation is carried out to the second constant DC voltage, obtaining DC output voltage includes: that acquisition is used for
Adjust the duty ratio of DC output voltage；Decompression transformation is carried out to the second constant DC voltage according to duty ratio, is obtained default
The DC output voltage changed in voltage range.
To achieve the goals above, according to another aspect of the present invention, a kind of charging unit of charger is provided.This is filled
The charging unit of motor includes: the first converter unit, carries out exchange for the AC-input voltage to charger and turns DC converting,
Obtain the first constant DC voltage；Second converter unit obtains second for carrying out boosting inverter to the first constant DC voltage
Constant DC voltage, wherein the corresponding power of the first constant DC voltage power corresponding with the second constant DC voltage is perseverance
Determine power；Third converter unit obtains DC output voltage for carrying out decompression transformation to the second constant DC voltage；First
Acquiring unit, for obtaining the average anode current under firm power according to DC output voltage；Second acquisition unit is used for root
According to DC output voltage and average anode current, firm power is obtained.
Further, which includes: acquisition module, for obtaining the electric current minimum limit value of charger；
Determining module, for determining the voltage maximum limit of charger according to firm power and electric current minimum limit value；Boost module,
For the first constant DC voltage to be boosted to voltage maximum limit, wherein the second constant DC voltage includes voltage maximum
Limiting value.
To achieve the goals above, according to another aspect of the present invention, a kind of charger is provided.The charger includes:
AC-DC translation circuit carries out exchange for the AC-input voltage to charger and turns DC converting, obtains the first constant dc
Pressure；First DC-DC conversion circuit is connected with AC-DC translation circuit, for carrying out boosting change to the first constant DC voltage
It changes, obtains the second constant DC voltage, wherein the corresponding power of the first constant DC voltage is corresponding with the second constant DC voltage
Power be firm power；Second DC-DC conversion circuit is connected with the first DC-DC conversion circuit, for constant straight to second
Galvanic electricity pressure carries out decompression transformation, obtains DC output voltage, obtains the direct current output under firm power according to DC output voltage
Electric current obtains firm power according to DC output voltage and average anode current.
Further, which includes: transformer primary side switch, is connected with AC-DC translation circuit
It connects, for receiving the first constant DC voltage；Transformer is connected, for according to transformer voltage ratio with transformer primary side switch
First constant DC voltage is boosted into the second constant DC voltage；Transformer secondary switch, is connected with transformer, for defeated
Second constant DC voltage out.
Further, the voltage parameter of transformer primary side switch is the first constant DC voltage, transformer primary side switch
Current parameters obtained by firm power and the first constant DC voltage.
Further, the voltage parameter of transformer secondary switch is the second constant DC voltage, transformer secondary switch
Current parameters are obtained by firm power and the second constant DC voltage.
Further, which includes: switching tube, is connected with the first DC-DC conversion circuit, is used
In receiving the second constant DC voltage, and decompression transformation is carried out to the second constant DC voltage according to the duty ratio of switching tube, obtained
To the DC output voltage changed in predetermined voltage range.
Further, the voltage parameter of the second DC-DC conversion circuit be voltage range in voltage maximum limit, second
The current parameters of DC-DC conversion circuit are obtained by the voltage minimum limit value in firm power and voltage range.
To achieve the goals above, according to another aspect of the present invention, this provides a kind of electric car.The electric car
The charging unit or charger of charger including the embodiment of the present invention.
Through the invention, exchange is carried out using the AC-input voltage to charger and turns DC converting, it is constant to obtain first
DC voltage；Boosting inverter is carried out to the first constant DC voltage, obtains the second constant DC voltage, wherein first is constant straight
The corresponding power of galvanic electricity pressure power corresponding with the second constant DC voltage is firm power；Second constant DC voltage is carried out
Decompression transformation obtains DC output voltage；The average anode current under firm power is obtained according to DC output voltage；According to straight
Output voltage and average anode current are flowed, firm power is obtained, since the first constant DC voltage is carried out boosting inverter, is obtained
The second fixed constant DC voltage, rather than adjustable voltage in a wide range of is exported to meet loading demand, and right
Second constant DC voltage is depressured, and realizes Width funtion output, realizes output power by the change action of voltage and current
It is constant, the charge efficiency of charger is improved, solves the problems, such as that the charging cost of charger is big, and then has reached reduction charging
The effect of the charging cost of machine.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to one of the relevant technologies charger power vs. voltage curve；
Fig. 2 is a kind of structural schematic diagram of charger according to an embodiment of the present invention；
Fig. 3 is a kind of flow chart of the charging method of charger according to an embodiment of the present invention；
Fig. 4 is a kind of main circuit signal of wide-voltage range invariable power electric automobile battery charger according to an embodiment of the present invention
Figure；
Fig. 5 is a kind of schematic diagram of the power vs. voltage curve of invariable power charger according to an embodiment of the present invention；And
Fig. 6 is a kind of schematic diagram of the charging unit of charger according to an embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
The embodiment of the invention provides a kind of chargers.
Fig. 2 is a kind of structural schematic diagram of charger according to an embodiment of the present invention.As shown in Fig. 2, the charger includes:
AC-DC translation circuit 10, the first DC-DC conversion circuit 20 and the second DC-DC conversion circuit 30.
AC-DC translation circuit 10 carries out exchange for the AC-input voltage to charger and turns DC converting, obtains first
Constant DC voltage.
Charger can charge for lithium ion battery invariable power.AC-DC translation circuit 10 is the first order circuit of charger,
It can opening up using pulsewidth modulation (Pulse Width Modulation, referred to as PWM) rectifier or Vienna rectifier
Structure and control strategy are flutterred, the AC-input voltage of charger is obtained, AC-input voltage is subjected to exchange and turns DC converting,
Obtain the first constant DC voltage.Optionally, PWM rectifier is Three-Phase PWM Rectifier, for example, using the exchange of three-phase 380V
Input voltage, DC output voltage is constant, for example, output voltage is constant in 650V, maximum current 128V.Wherein, it exchanges defeated
Enter voltage and keep sinusoidal, and with input voltage same-phase.
First DC-DC conversion circuit 20, is connected with AC-DC translation circuit 10, for being pressed into the first constant dc
Row boosting inverter obtains the second constant DC voltage, wherein the corresponding power of the first constant DC voltage and the second Constant Direct Current
The corresponding power of voltage is firm power.
First DC-DC conversion circuit 20 is the second level circuit of charger, can be high-frequency isolation DC-DC conversion circuit,
Its topological structure can be identical as the topological structure of existing charger, for carrying out boosting change to the first constant DC voltage
It changes, obtains the second constant DC voltage, wherein the second constant DC voltage does not need to adjust, and the first constant DC voltage is corresponding
Power power corresponding with the second constant DC voltage be firm power, the first constant DC voltage pair under the firm power
The first electric current, corresponding second electric current of the second constant DC voltage are answered, thus the parameter of transformer primary side switch can be according to first
Constant DC voltage and the first electric current determine, the parameter of the secondary-side switch of transformer can be according to the second constant DC voltage and the
Two electric currents determine.The output end of first DC-DC conversion circuit 20 is high voltage low current under invariable power, and optionally, this second
Constant DC voltage is ceiling voltage, and optimal pressure swing device no-load voltage ratio and optimum resonance condition may be implemented.First DC-DC transformation electricity
Road 20 can be realized using hard switching, be switched under the intrinsic period, and various Sofe Switch harmonic technologies, benefit can also be used
With oscillation action, switching tube is opened and closed when voltage and current is zero, greatly reduces the damage on switching tube in this way
Consumption, and then the charge efficiency of charger is improved, the output voltage for avoiding traditional charger is adjusted interior on a large scale to meet
Load the deficiency needed.
In first DC-DC conversion circuit 20, since the second constant DC voltage does not need to adjust, the duty of switching tube
Than that can control always in the range of close to 50%, almost without ripple in DC side electric current, charger charging is improved
Efficiency.
Second DC-DC conversion circuit 30 is connected with the first DC-DC conversion circuit 20, for the second constant dc
Pressure carries out decompression transformation, obtains DC output voltage, obtains the average anode current under firm power according to DC output voltage,
According to DC output voltage and average anode current, firm power is obtained.
Second DC-DC conversion circuit 30 is the tertiary circuit of charger, can be for using non-isolated pressure-adjustable DC-DC electricity
Road, for example, Buck conversion circuit (BUCK) obtains direct current output for carrying out decompression transformation to the second constant DC voltage
Voltage obtains the average anode current under firm power according to DC output voltage, according to DC output voltage and direct current output
Electric current obtains firm power, thus voltage transformation when realizing constant power output, since the working frequency of BUCK circuit is very high,
In one switch periods, ripple very little caused by capacitor charge and discharge.Wherein, the second DC-DC conversion circuit 30 can be defeated in prime
Decompression transformation is carried out below constant ceiling voltage out, realizes the output voltage of wide-voltage range.Meanwhile the 2nd DC-DC become
The current capacity design for changing circuit 30 is larger, can export biggish electric current at low voltage, so that the 2nd DC-DC is converted
Circuit output firm power.Due to the change action of the voltage and current of the second DC-DC conversion circuit 30, exported in low-voltage, high-current
When the first DC-DC conversion circuit 20 be output still maintain high voltage-small current, there is no increase AC-DC translation circuit 10 and first
The current capacity of DC-DC conversion circuit 20, so that the charging cost for generating charger be avoided to increase substantially and charge efficiency
The problem of loss.
Second DC-DC conversion circuit 30 can make output voltage in ceiling voltage and most by regulating switch pipe duty ratio
It changes within the wide scope of low-voltage.In order to guarantee that the second DC-DC conversion circuit 30 exports firm power, as the 2nd DC-
When DC translation circuit 30 exports minimum voltage, output electric current should be the maximum current under firm power, the 2nd DC-DC of GIA transformation
The circuit parameter of circuit should be determined according to ceiling voltage and maximum current.
The embodiment carries out exchange by AC-input voltage of the AC-DC translation circuit 10 to charger and turns DC converting,
The first constant DC voltage is obtained, is connected by the first DC-DC conversion circuit 20 with AC-DC translation circuit 10, for the
One constant DC voltage carries out boosting inverter, obtains the second constant DC voltage, wherein the corresponding function of the first constant DC voltage
Rate power corresponding with the second constant DC voltage is firm power, is become by the second DC-DC conversion circuit 30 and the first DC-DC
Circuit 20 is changed to be connected, it is defeated according to direct current for obtaining DC output voltage to the second constant DC voltage progress decompression transformation
The average anode current that voltage obtains under firm power out obtains constant function according to DC output voltage and average anode current
Rate, due to obtaining the second fixed constant DC voltage for the first constant DC voltage progress boosting inverter, rather than in order to full
Sufficient loading demand and export adjustable voltage in a wide range of, and the second constant DC voltage is depressured, realizes Width funtion
Output realizes the constant of output power by the change action of voltage and current, improves the charge efficiency of charger, solve and fill
The big problem of the charging cost of motor, and then achieved the effect that the charging cost for reducing charger.
As an alternative embodiment, the first DC-DC conversion circuit includes: transformer primary side switch, become with AC-DC
It changes circuit to be connected, for receiving the first constant DC voltage；Transformer, with transformer primary side switch be connected, for according to
First constant DC voltage is boosted to the second constant DC voltage by transformer voltage ratio；Transformer secondary switch, with transformer phase
Connection, for exporting the second constant DC voltage.
First DC-DC conversion circuit includes transformer primary side switch, transformer and transformer secondary switch.Wherein, transformation
Device primary side switch is connected with AC-DC translation circuit, for receiving the first constant DC voltage, the ginseng of transformer primary side switch
Number can be determined according to the first electric current under the first constant DC voltage and firm power.Transformer voltage ratio be high-pressure side winding and
The ratio between low-pressure side umber of turn can be used for the expression of the ratio between voltage rating of high-pressure side and low-pressure side, transformer and primary side switch
It is connected, for the first constant DC voltage to be boosted to the second DC voltage according to transformer voltage ratio.Transformer secondary switch
It is connected with transformer, for exporting the second constant DC voltage, the parameter of transformer secondary switch can be constant by second
The second electric current under DC voltage and firm power determines.
As an alternative embodiment, the voltage parameter of transformer primary side switch is the first constant DC voltage, become
The current parameters of depressor primary side switch are obtained by firm power and the first constant DC voltage.
The parameter of transformer primary side switch includes voltage parameter and current parameters.Wherein, voltage parameter can be by the first perseverance
Determine DC voltage to determine.It is depressed in first constant dc, the electric current being calculated according to firm power is determined as transformation
The current parameters of device primary side switch.
As an alternative embodiment, the voltage parameter of transformer secondary switch is the second constant DC voltage, become
The current parameters of depressor secondary-side switch are obtained by firm power and the second constant DC voltage.
Transformer secondary switch includes voltage parameter and current parameters.Wherein, voltage parameter can be by the second Constant Direct Current
Voltage determines.It is depressed in second constant dc, the electric current being calculated according to firm power is determined as transformer primary side
The current parameters of switch.Under the transformer secondary of the voltage parameter and current parameters switch, output voltage can be fixed on
Ceiling voltage may be implemented optimal pressure swing device no-load voltage ratio and optimum resonance condition, improve the charge efficiency of charger.
As an alternative embodiment, the second DC-DC conversion circuit includes: switching tube, electricity is converted with the first DC-DC
Road is connected, and carries out for receiving the second constant DC voltage, and according to the duty ratio of switching tube to the second constant DC voltage
Decompression transformation obtains the DC output voltage changed in predetermined voltage range.
Second DC-DC conversion circuit includes switching tube, is controllable switch, by regulating switch pipe duty ratio, can make the
Two constant dcs are pressed in the wide scope between minimum voltage and ceiling voltage Nei and convert.It is constant to keep the power of output
Power, when the second constant DC voltage is minimum, corresponding most High Output Current, the circuit parameter of the second DC-DC conversion circuit is answered
According to highest second constant DC voltage and most High Output Current.
As an alternative embodiment, the voltage parameter of the second DC-DC conversion circuit is the voltage in voltage range
Maximum limit, the current parameters of the second DC-DC conversion circuit are by the voltage minimum limit value in firm power and voltage range
It obtains.
Second DC-DC conversion circuit includes voltage parameter and current parameters.The voltage obtained in output voltage range is maximum
Voltage maximum limit is determined as the voltage parameter of the second DC-DC conversion circuit by limiting value；Obtain the voltage in voltage range
Minimum limit value calculates the current parameters of the second DC-DC conversion circuit according to firm power and voltage minimum limit value.
The charger uses three-level variation, including AC-DC translation circuit, the first DC-DC conversion circuit and the 2nd DC-
DC translation circuit can remain constant power output, while cost being avoided significantly to mention in output voltage wide variation
It is high.The first order AC-DC translation circuit of the embodiment of the present invention is identical with traditional charger, can using PWM rectifier or
The topological structure and control strategy of person Vienna rectifier；Second level high-frequency isolation DC-DC conversion circuit is on the topology
It is identical as traditional charger, but control strategy is different, and this grade of circuit output voltage of the embodiment of the present invention is fixed on ceiling voltage,
Optimal pressure swing device no-load voltage ratio and optimum resonance condition may be implemented；When second DC-DC conversion circuit may be implemented constant power output
Voltage current transformation.The charger of the embodiment of the present invention is wide with output voltage range, perseverance function can be achieved in full voltage range
Rate output, feature small in size, light-weight, high-efficient, at low cost compared to other invariable power schemes, are applicable to be compatible with electronic
Bus and small-sized electric vehicle charge and to keep the application of constant power output, having saved the charging cost of charger, having mentioned
The high charge efficiency of charger.
The embodiment of the invention provides a kind of charging methods of charger.It should be noted that the charger of the embodiment
Charging method can be executed by the charger of the embodiment of the present invention.
Fig. 3 is a kind of flow chart of the charging method of charger according to an embodiment of the present invention.As shown in figure 3, the charging
The charging method of machine the following steps are included:
Step S302 carries out exchange to the AC-input voltage of charger and turns DC converting, obtains the first constant dc
Pressure.
In the technical solution that the application above-mentioned steps S302 is provided, exchange is carried out to the AC-input voltage of charger and is turned
DC converting obtains the first constant DC voltage.
The AC-input voltage for obtaining charger carries out the transformation that exchange turns direct current to AC-input voltage, can use
The topological structure and control strategy of PWM rectifier or Vienna rectifier export the first constant constant DC voltage.It can
Selection of land, PWM rectifier are Three-Phase PWM Rectifier, and AC-input voltage keeps sinusoidal, and with input voltage same-phase.
Step S304 carries out boosting inverter to the first constant DC voltage, obtains the second constant DC voltage.
In the technical solution that the application above-mentioned steps S304 is provided, boosting inverter is carried out to the first constant DC voltage,
Obtain the second constant DC voltage, wherein the corresponding power of the first constant DC voltage is corresponding with the second constant DC voltage
Power is firm power.
Exchange, which is carried out, in the AC-input voltage to charger turns DC converting, after obtaining the first constant DC voltage,
Using the first constant DC voltage as input voltage, boosting inverter is carried out, it can be by high-frequency isolation DC-DC conversion circuit to the
One constant DC voltage carries out boosting inverter, and topological structure can be identical as the topological structure of existing charger.The implementation
Second constant DC voltage of example is fixed voltage, does not need to adjust, and the duty ratio of switching tube can be controlled always close
In the range of 50%, almost without ripple in DC side electric current, the efficiency of charger charging is improved.
The corresponding power of first constant DC voltage power corresponding with the second constant DC voltage is firm power, at this
The first constant DC voltage corresponds to the first electric current, corresponding second electric current of the second constant DC voltage, in invariable power under firm power
Lower output is high voltage low current.Optionally, which is fixed on ceiling voltage, and optimal pressure swing may be implemented
Device no-load voltage ratio and optimum resonance condition.It can be realized using hard switching, be switched under the intrinsic period, it can also be using each
Kind Sofe Switch harmonic technology opens and closes switching tube when voltage and current is zero using oscillation action, subtracts significantly in this way
The loss on switching tube is lacked, and then has improved the charge efficiency of charger, the output voltage for avoiding traditional charger exists
It is adjusted in a wide range of to meet the deficiency that load needs.
Step S306 carries out decompression transformation to the second constant DC voltage, obtains DC output voltage.
In the technical solution that the application above-mentioned steps S306 is provided, decompression transformation is carried out to the second constant DC voltage,
Obtain DC output voltage.
Decompression transformation is being carried out to the second constant DC voltage, after obtaining DC output voltage, to the second Constant Direct Current
Voltage carries out decompression transformation, obtains DC output voltage, realizes that low-voltage is exported in wide-voltage range.BUCK circuit can be passed through
Decompression transformation is carried out to the second constant DC voltage, obtains DC output voltage.Optionally BUCK circuit passes through regulating switch pipe
Duty ratio.Output voltage can be made to convert in the wide-voltage range of 200V to 750V.
Step S308 obtains the average anode current under firm power according to DC output voltage.
In the technical solution that the application above-mentioned steps S308 is provided, obtained under firm power according to DC output voltage
Average anode current.
Decompression transformation is being carried out to the second constant DC voltage, after obtaining DC output voltage, according to direct current output electricity
Press the average anode current determined under invariable power.In the charging method of the charger, current capacity design is larger, can be low
Larger current is exported when pressure, and then keeps constant the power of output.Since when low-voltage, high-current exports, input side is still protected
High voltage-small current is held, the current capacity of front stage circuits is not increased, so that the charging cost for generating charger be avoided significantly to mention
The problem of high and charge efficiency is lost.
Step S310 obtains firm power according to DC output voltage and average anode current.
In the technical solution that the application above-mentioned steps S310 is provided, according to DC output voltage and average anode current,
Obtain firm power.
DC output voltage changes in wide-voltage range, average anode current also with DC output voltage variation and
Variation.After obtaining the average anode current under firm power according to DC output voltage, according to DC output voltage and directly
Stream output electric current, obtains firm power, to ensure that the constant power output of charger.
The embodiment carries out exchange by the AC-input voltage to charger and turns DC converting, obtains the first Constant Direct Current
Voltage；Boosting inverter is carried out to the first constant DC voltage, obtains the second constant DC voltage, wherein the first constant dc
Pressing corresponding power power corresponding with the second constant DC voltage is firm power；Second constant DC voltage is depressured
Transformation, obtains DC output voltage；The average anode current under firm power is obtained according to DC output voltage；It is defeated according to direct current
Voltage and average anode current out, obtain firm power, since the first constant DC voltage is carried out boosting inverter, are fixed
The second constant DC voltage, rather than adjustable voltage in a wide range of is exported to meet loading demand, and to second
Constant DC voltage is depressured, and realizes Width funtion output, realizes the constant of output power by the change action of voltage and current,
The charge efficiency for improving charger solves the problems, such as that the charging cost of charger is big, and then has reached reduction charger
The effect of charging cost.
As an alternative embodiment, carrying out boosting inverter to the first constant DC voltage, it is constant straight to obtain second
Galvanic electricity pressure includes: to obtain the electric current minimum limit value of charger；Charger is determined according to firm power and electric current minimum limit value
Voltage maximum limit；First constant DC voltage is boosted into voltage maximum limit, wherein the second constant DC voltage
Including voltage maximum limit.
Boosting inverter is carried out to the first constant DC voltage, obtaining the second constant DC voltage includes: to obtain charger
Electric current minimum limit value；The voltage maximum limit of charger is determined according to firm power and electric current minimum limit value；By first
Constant DC voltage boosts to voltage maximum limit, wherein the second constant DC voltage includes voltage maximum limit.
Exchange, which is carried out, in the AC-input voltage to charger turns DC converting, after obtaining the first constant DC voltage,
The electric current minimum limit value of charger is obtained, which can be used as the minimum current parameter in DC-DC circuit.
Under firm power, the voltage maximum limit of charger is determined according to electric current minimum limit value, which can
The first constant DC voltage is boosted to voltage maximum limit, to make as the maximum current parameter in DC-DC circuit
It obtains the second constant DC voltage and is fixed on ceiling voltage, guarantee the output HIGH voltage low current under invariable power, be increased without circuit
Current capacity, so as to avoid charger charging cost increase substantially and loss in efficiency, wherein the second Constant Direct Current
Voltage includes voltage maximum limit.
As an alternative embodiment, carrying out boosting inverter to the first constant DC voltage, it is constant straight to obtain second
Galvanic electricity pressure includes: the transformer voltage ratio obtained for adjusting the first constant DC voltage；According to the first constant DC voltage and change
Transformer voltage ratio obtains the second constant DC voltage.
Transformer is used to carry out boosting inverter to the first constant DC voltage.It is carried out in the AC-input voltage to charger
Exchange turns DC converting, after obtaining the first constant DC voltage, transformer voltage ratio is obtained, to the first constant DC voltage and change
Transformer voltage ratio is calculated, and the second constant DC voltage is obtained.
As an alternative embodiment, carrying out decompression transformation to the second constant DC voltage, direct current output electricity is obtained
Pressure includes: the duty ratio obtained for adjusting DC output voltage；The second constant DC voltage is depressured according to duty ratio
Transformation, obtains the DC output voltage changed in predetermined voltage range.
Boosting inverter is being carried out to the first constant DC voltage, it is constant to second after obtaining the second constant DC voltage
DC voltage carries out decompression transformation, and the duty ratio of regulating switch pipe is depressured the second constant DC voltage according to duty ratio
Transformation, converts DC output voltage in wide-voltage range, and remain constant power output, avoids charging cost
Greatly improve.
It should be noted that step shown in the flowchart of the accompanying drawings can be in such as a group of computer-executable instructions
It is executed in computer system, although also, logical order is shown in flow charts, and it in some cases, can be with not
The sequence being same as herein executes shown or described step.
Technical solution of the present invention is illustrated below with reference to a kind of preferred embodiment.
Power output degradation when the embodiment is directed to low output voltage existing for traditional electric automobile battery charger causes
The problem of charger capacity underutilization provides a kind of novel wide-voltage range invariable power electric automobile battery charger, by using
Three-level translation circuit realizes the perseverance in whole output voltage ranges under the premise of increased costs are limited, efficiency reduces unconspicuous
Power output.
The wide-voltage range invariable power electric automobile battery charger of the embodiment, it is solid comprising AC-DC translation circuit, high-frequency isolation
Constant voltage exports DC-DC conversion circuit and non-isolated pressure-adjustable DC-DC conversion circuit three parts.
First order AC-DC translation circuit, it is identical with traditional charger, PWM rectifier or Vienna can be used
The topological structure and control strategy of rectifier.Optionally, using Three-Phase PWM Rectifier, DC output voltage is constant, exchange input
Electric current keeps sinusoidal, and with input voltage same-phase.
Second level high-frequency isolation DC-DC conversion circuit is also identical as traditional charger on the topology, but controls plan
Slightly different, this grade of circuit output voltage of traditional charger is needed in a wide range of interior adjusting to meet load needs, and the present invention is real
This grade of circuit output voltage for applying example is fixed on ceiling voltage, and optimal pressure swing device no-load voltage ratio and optimum resonance condition may be implemented.It can
To use hard switching, various Sofe Switch harmonic technologies can also be used to reduce switching loss, improve the charge efficiency of charger.
Tertiary circuit uses non-isolated pressure-adjustable DC-DC conversion circuit, that is, BUCK circuit, when realizing constant power output
Voltage current transformation.BUCK circuit can carry out decompression transformation below the constant ceiling voltage that prime exports, and realize wide electricity
Press range output.Simultaneously because this grade of circuital current Capacity design is larger, larger current can be exported at low voltage, make to export
Power is kept constant.Since the voltage current transformation of BUCK circuit acts on, in low-voltage, high-current output, input side is still maintained
High voltage-small current does not increase the current capacity of front stage circuits, so as to avoid cost increase substantially and loss in efficiency.
The novel wide-voltage range invariable power electric automobile battery charger of the embodiment by AC-DC translation circuit, high frequency every
DC-DC conversion circuit and non-isolated pressure-adjustable DC-DC conversion circuit are exported in output voltage wide variation from fixed voltage
When, it remains constant power output, while cost being avoided to increase substantially, improves the charge efficiency of charger.
Fig. 4 is a kind of main circuit signal of wide-voltage range invariable power electric automobile battery charger according to an embodiment of the present invention
Figure.As shown in figure 4, the parameter indicated in figure is so that P is 60KW charger design parameter as an example.
First order AC-DC translation circuit can be inputted using three-phase 380V, and output voltage is constant in V1, wherein V1 is
650V, maximum current 128A, the component parameter in first order AC-DC translation circuit can be designed according to 650V, 128A.
The constant 650V of input voltage, the constant V2 of output voltage in the DC-DC circuit of the second level, wherein when V2 750V, 60KW
The corresponding average current of 650V is 92A, and the corresponding average current of V2 is I1, wherein I1 80A, and not due to output voltage
It needs to adjust, switching tube duty ratio can control always close to 50%, transformer voltage ratio 650:750, in DC side electric current
Almost without ripple, therefore the parameter of transformer primary side switch can be designed according to 650V, 92A, and the parameter of secondary-side switch can be with
It is designed according to 750V, 80A.
Third level DC-DC circuit can make output voltage exist for BUCK circuit by regulating switch pipe duty ratio
Variation, V3 200V, V2 700V in the wide scope of V3-V2.To keep constant 60KW output power, when output voltage is V3
Electric current should be I2, wherein V3 200V, I2 300A, therefore the maximum current of third level DC-DC circuit is I2, third level DC-
The circuit parameter of DC circuit should be designed by V2, I2,750V, 300A design.So that the electricity of third level DC-DC circuit output
Pressure, electric current change between V2/I1 and V3/I2, that is, converting between 750V/80A and 200V/300A.
Fig. 5 is a kind of schematic diagram of the power vs. voltage curve of invariable power charger according to an embodiment of the present invention.Such as Fig. 5
It is shown.Equally with firm power (PO) it is 60KW, Width funtion (UO) range be 200V-750V design parameter for, realize defeated
When voltage is between 200V-750V out, export firm power 60KW, reached in full voltage range realize constant power output,
Purpose small in size, light-weight, high-efficient, at low cost compared to other invariable power schemes can be adapted for needing to be compatible with electronic big
Bar and small-sized electric vehicle charge and to keep the application of constant power output.
It is analyzed from cost and standpoint of efficiency, the charger of the embodiment is compared to traditional charger scheme, although increasing
Primary conversion circuit, but since BUCK circuit structure is simple, only one controllable switch, in the cost and loss of whole charger
Middle proportion is smaller.In addition to keeping the constant power output in wide-voltage range, only afterbody BUCK circuit needs
By high-voltage great-current parameter designing, and front two-stage circuit still presses the high voltage-small current parameter designing under corresponding power, simultaneously
It since preceding two-stage circuit component is more, and include high frequency transformer, shared specific gravity is bigger in overall cost and loss,
Therefore it keeps preceding two-stage circuit parameter constant and only increases tertiary circuit, limited to the increased costs of charger, efficiency reduces
It is unobvious.
The embodiment of the invention provides a kind of novel electric vehicle lithium ion battery invariable power charger design schemes, different
In traditional charger using the realization of the Two Stages of AC-DC translation circuit combination high-frequency isolation pressure-adjustable DC-DC conversion circuit
Mode, the embodiment of the present invention uses three-level variation, including is exported by AC-DC translation circuit, high-frequency isolation fixed voltage
DC-DC conversion circuit and non-isolated pressure-adjustable DC-DC conversion circuit can be remained in output voltage wide variation
Constant power output, while the charging cost of charger being avoided to increase substantially.The first order AC-DC of the embodiment of the present invention converts electricity
Road is identical with traditional charger, can be using PWM rectifier or the topological structure and control strategy of Vienna rectifier；
Second level high-frequency isolation DC-DC conversion circuit is also identical as traditional charger on the topology, but control strategy is different, tradition
Charger needs to adjust in a wide range of in this grade of circuit output voltage to meet load needs, and the embodiment of the present invention should
Grade circuit output voltage is fixed on ceiling voltage, and optimal pressure swing device no-load voltage ratio and optimum resonance condition may be implemented；Tertiary circuit
Using non-isolated pressure-adjustable DC-DC conversion circuit namely BUCK circuit, so that voltage and current when realizing constant power output becomes
It changes.The charger of the embodiment of the present invention is wide with output voltage range, constant power output, volume can be achieved in full voltage range
Small, light-weight advantage, it is high-efficient, at low cost compared to other invariable power schemes, it is applicable to compatible electric bus and small-sized
Electric car charges and to keep the application of constant power output.
It should be noted that the attached drawing of the embodiment is to illustrate novel wide-voltage range invariable power electric automobile battery charger
Working principle.When considered in conjunction with the accompanying drawings, the present invention can be more completely and better understood.Attached drawing described herein is used to provide
A further understanding of the present invention, examples and descriptions thereof are used to explain the present invention, does not constitute improper limitations of the present invention.
The embodiment of the invention also provides a kind of charging units of charger.It should be noted that the charging of the embodiment
The charging unit of machine can execute the charging method of the charger of the embodiment of the present invention.
Fig. 6 is a kind of schematic diagram of the charging unit of charger according to an embodiment of the present invention.As shown in fig. 6, the charging
The charging unit of machine includes: the first converter unit 40, the second converter unit 50, third converter unit 60, first acquisition unit 70
With second acquisition unit 80.
First converter unit 40 carries out exchange for the AC-input voltage to charger and turns DC converting, obtains first
Constant DC voltage.
Second converter unit 50 obtains the second constant dc for carrying out boosting inverter to the first constant DC voltage
Pressure, wherein the corresponding power of the first constant DC voltage power corresponding with the second constant DC voltage is firm power.
Third converter unit 60 obtains DC output voltage for carrying out decompression transformation to the second constant DC voltage.
First acquisition unit 70, for obtaining the average anode current under firm power according to DC output voltage.
Second acquisition unit 80, for obtaining firm power according to DC output voltage and average anode current.
Optionally, the second converter unit includes: to obtain module, determining module and boost module.Wherein: obtaining module, use
In the electric current minimum limit value for obtaining charger；Determining module, for being filled according to firm power and the determination of electric current minimum limit value
The voltage maximum limit of motor；Boost module, for the first constant DC voltage to be boosted to voltage maximum limit,
In, the second constant DC voltage includes voltage maximum limit.
Optionally, the second converter unit 50 includes: that the first acquisition module and second obtain module.Wherein, first mould is obtained
Block, for obtaining the transformer voltage ratio for being used for adjusting the first constant DC voltage；Second obtains module, for constant according to first
DC voltage and transformer voltage ratio obtain the second constant DC voltage.
Optionally, third converter unit 60 includes: that third obtains module and voltage reduction module.Wherein, third obtains module, uses
In obtaining the duty ratio for adjusting DC output voltage；Voltage reduction module is used for according to duty ratio to the second constant dc
Pressure carries out decompression transformation, obtains the DC output voltage changed in predetermined voltage range.
The embodiment carries out exchange by AC-input voltage of first converter unit 40 to charger and turns DC converting, obtains
To the first constant DC voltage, boosting inverter is carried out to the first constant DC voltage by the second converter unit 50, obtains second
Constant DC voltage, wherein the corresponding power of the first constant DC voltage power corresponding with the second constant DC voltage is perseverance
Determine power, decompression transformation is carried out to the second constant DC voltage by third converter unit 60, DC output voltage is obtained, passes through
First acquisition unit 70 obtains the average anode current under firm power according to DC output voltage, passes through second acquisition unit 80
According to DC output voltage and average anode current, firm power is obtained, since the first constant DC voltage is carried out boosting change
It changes, obtains the second fixed constant DC voltage, rather than export adjustable voltage in a wide range of in order to meet loading demand,
And the second constant DC voltage is depressured, realizes Width funtion output, realizes output by the change action of voltage and current
Power it is constant, improve the charge efficiency of charger, solve the problems, such as that the charging cost of charger is big, and then reached drop
The effect of the charging cost of low charger.
The embodiment of the invention also provides a kind of electric car, which includes the charger of the embodiment of the present invention
Charging unit, or the charger including the embodiment of the present invention.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Be performed by computing device in the storage device, perhaps they are fabricated to each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific
Hardware and software combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of charging method of charger characterized by comprising
Exchange is carried out to the AC-input voltage of charger and turns DC converting, obtains the first constant DC voltage；
Boosting inverter is carried out to first constant DC voltage, obtains the second constant DC voltage, wherein described first is constant
The corresponding power of DC voltage power corresponding with second constant DC voltage is identical firm power；
Decompression transformation is carried out to second constant DC voltage, obtains DC output voltage；
The average anode current under the firm power is obtained according to the DC output voltage；
According to the DC output voltage and the average anode current, the firm power is obtained；
Wherein, decompression transformation is carried out to second constant DC voltage, obtaining DC output voltage includes: to obtain the charging
The electric current minimum limit value of machine；The voltage of the charger is determined most according to the firm power and the electric current minimum limit value
Big limiting value；First constant DC voltage is boosted into the voltage maximum limit, wherein second Constant Direct Current
Voltage includes the voltage maximum limit.
2. the method according to claim 1, wherein to first constant DC voltage carry out boosting inverter,
Obtaining second constant DC voltage includes:
Obtain the transformer voltage ratio for adjusting first constant DC voltage；
Second constant DC voltage is obtained according to first constant DC voltage and the transformer voltage ratio.
3. the method according to claim 1, wherein to second constant DC voltage carry out decompression transformation,
Obtaining the DC output voltage includes:
Obtain the duty ratio for adjusting the DC output voltage；
Decompression transformation is carried out to second constant DC voltage according to the duty ratio, obtains changing in predetermined voltage range
The DC output voltage.
4. a kind of charging unit of charger characterized by comprising
First converter unit carries out exchange for the AC-input voltage to charger and turns DC converting, and it is constant straight to obtain first
Galvanic electricity pressure；
Second converter unit, for obtaining the second constant DC voltage to first constant DC voltage progress boosting inverter,
Wherein, the corresponding power of first constant DC voltage power corresponding with second constant DC voltage is identical constant
Power；
Third converter unit obtains DC output voltage for carrying out decompression transformation to second constant DC voltage；
First acquisition unit, for obtaining the average anode current under the firm power according to the DC output voltage；
Second acquisition unit, for obtaining the firm power according to the DC output voltage and the average anode current；
Wherein, second converter unit includes: acquisition module, for obtaining the electric current minimum limit value of the charger；Really
Cover half block, for determining the voltage greatest limit of the charger according to the firm power and the electric current minimum limit value
Value；Boost module, for first constant DC voltage to be boosted to the voltage maximum limit, wherein described second
Constant DC voltage includes the voltage maximum limit.
5. a kind of charger characterized by comprising
AC-DC translation circuit carries out exchange for the AC-input voltage to charger and turns DC converting, and it is constant straight to obtain first
Galvanic electricity pressure；
First DC-DC conversion circuit is connected with the AC-DC translation circuit, for being pressed into first constant dc
Row boosting inverter obtains the second constant DC voltage, wherein the corresponding power of first constant DC voltage and described second
The corresponding power of constant DC voltage is identical firm power；
Second DC-DC conversion circuit is connected with first DC-DC conversion circuit, for second constant dc
Pressure carries out decompression transformation, obtains DC output voltage, obtains the direct current under the firm power according to the DC output voltage
It exports electric current and the firm power is obtained according to the DC output voltage and the average anode current；
Wherein, second DC-DC conversion circuit is for dropping second constant DC voltage by following steps
Buckling is changed, and the DC output voltage is obtained: obtaining the electric current minimum limit value of the charger；According to the firm power and
The electric current minimum limit value determines the voltage maximum limit of the charger；First constant DC voltage is boosted to
The voltage maximum limit, wherein second constant DC voltage includes the voltage maximum limit.
6. charger according to claim 5, which is characterized in that first DC-DC conversion circuit includes:
Transformer primary side switch, is connected, for receiving first constant DC voltage with the AC-DC translation circuit；
Transformer is connected with transformer primary side switch, for according to transformer voltage ratio by first constant dc
Pressure boosts to second constant DC voltage；
Transformer secondary switch, is connected, for exporting second constant DC voltage with the transformer.
7. charger according to claim 6, which is characterized in that the voltage parameter of the transformer primary side switch is described
First constant DC voltage, the current parameters of the transformer primary side switch are by the firm power and first Constant Direct Current
Voltage obtains.
8. charger according to claim 6, which is characterized in that the voltage parameter of the transformer secondary switch is described
Second constant DC voltage, the current parameters of the transformer secondary switch are by firm power and second constant DC voltage
It obtains.
9. charger according to claim 5, which is characterized in that second DC-DC conversion circuit includes: switching tube,
It is connected with first DC-DC conversion circuit, for receiving second constant DC voltage, and according to the switching tube
Duty ratio carries out decompression transformation to second constant DC voltage, and the direct current for obtaining changing in predetermined voltage range is defeated
Voltage out.
10. charger according to claim 9, which is characterized in that the voltage parameter of second DC-DC conversion circuit is
Voltage maximum limit in the voltage range, the current parameters of second DC-DC conversion circuit are by the firm power
It is obtained with the voltage minimum limit value in the voltage range.
11. a kind of electric car, which is characterized in that charging unit or claim including charger as claimed in claim 4
Charger described in any one of 5 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611192572.XA CN106685040B (en) | 2016-12-21 | 2016-12-21 | Charger and its charging method and device and electric car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611192572.XA CN106685040B (en) | 2016-12-21 | 2016-12-21 | Charger and its charging method and device and electric car |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106685040A CN106685040A (en) | 2017-05-17 |
| CN106685040B true CN106685040B (en) | 2019-05-24 |
Family
ID=58870164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611192572.XA Active CN106685040B (en) | 2016-12-21 | 2016-12-21 | Charger and its charging method and device and electric car |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106685040B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140036694A (en) * | 2012-09-18 | 2014-03-26 | 현대모비스 주식회사 | Power control apparatus for electric vehicle |
| CN105245025A (en) * | 2015-10-12 | 2016-01-13 | 华中科技大学 | System for achieving dynamic wireless constant power charging and control method for system |
| CN105322812A (en) * | 2014-07-04 | 2016-02-10 | 现代自动车株式会社 | Pulse width modulation resonance converter and charger for vehicle using the same |
| CN105453380A (en) * | 2013-06-21 | 2016-03-30 | 通用汽车环球科技运作有限责任公司 | Apparatus and method for grid-to-vehicle battery charging |
-
2016
- 2016-12-21 CN CN201611192572.XA patent/CN106685040B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140036694A (en) * | 2012-09-18 | 2014-03-26 | 현대모비스 주식회사 | Power control apparatus for electric vehicle |
| CN105453380A (en) * | 2013-06-21 | 2016-03-30 | 通用汽车环球科技运作有限责任公司 | Apparatus and method for grid-to-vehicle battery charging |
| CN105322812A (en) * | 2014-07-04 | 2016-02-10 | 现代自动车株式会社 | Pulse width modulation resonance converter and charger for vehicle using the same |
| CN105245025A (en) * | 2015-10-12 | 2016-01-13 | 华中科技大学 | System for achieving dynamic wireless constant power charging and control method for system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106685040A (en) | 2017-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | Current-stress-optimized switching strategy of isolated bidirectional DC–DC converter with dual-phase-shift control | |
| CN110120752A (en) | Power inverter and its control method | |
| CN103236706B (en) | The battery energy storage system of transformation topology is handed over based on modular multilevel | |
| CN108092371B (en) | Charging and discharging device | |
| CN104396116B (en) | For the method for the charger for controlling motor vehicle battery | |
| CN105119334A (en) | Voltage transformation circuit with wide voltage output range and DC charging pile | |
| CN102969932A (en) | Multifunctional current-type bidirectional AC (Alternating-Current)/DC (Direct-Current) converter and control method thereof | |
| KR20220029522A (en) | Single stage ac-dc converter | |
| CN103384122A (en) | Converter stage, electrical converter, ac/dc converter and battery charging terminal | |
| CN108312889B (en) | High-power high-efficiency bidirectional charger for subway vehicle | |
| US11292355B2 (en) | Battery charging method and system for on-board charger | |
| Gupta et al. | Single-stage isolated bridgeless charger for light electric vehicle with improved power quality | |
| CN105245092A (en) | Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering | |
| KR101865246B1 (en) | Changing and discharging apparatus for electric vehicle | |
| CN109842182A (en) | Power supply system | |
| CN106685040B (en) | Charger and its charging method and device and electric car | |
| Yang et al. | An integrated multifunctional battery charger with three-phase charging for plug-in electric vehicles | |
| EP4113813A1 (en) | Power electronic apparatus for converting input ac into dc | |
| CN107612352A (en) | One kind is segmented efficient phase shift power supply | |
| CN106685036A (en) | Charger, charging method and device thereof and electric vehicle | |
| CN109494841A (en) | A kind of battery charging plant main circuit structure | |
| CN112653350B (en) | Control method applied to three-phase photovoltaic inverter circuit and related device | |
| CN207853745U (en) | The direct current output low-frequency ripple suppression circuit of digital charge machine | |
| Bhati et al. | A Single Phase–Single Stage Improved Power Quality EV Charger for Small and Medium Power Application | |
| Sreehari et al. | Two stage EV charger based on bridgeless PFC converter for e-Rickshaw |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 101106 No. 9 Chuangyi East Road, East District, Tongzhou Economic Development Zone, Beijing Patentee after: Beijing Huashang Sanyou New Energy Science & Technology Co., Ltd. Address before: 101106 No. 9 Chuangyi East Road, East District, Daxing Economic Development Zone, Beijing Patentee before: Beijing Huashang Sanyou New Energy Science & Technology Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |