CN105720663B - Charging cabinet and its control method for electric vehicle - Google Patents
Charging cabinet and its control method for electric vehicle Download PDFInfo
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- CN105720663B CN105720663B CN201410728378.3A CN201410728378A CN105720663B CN 105720663 B CN105720663 B CN 105720663B CN 201410728378 A CN201410728378 A CN 201410728378A CN 105720663 B CN105720663 B CN 105720663B
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Abstract
The invention discloses a kind of charging cabinets for electric vehicle, comprising: N number of two-way AC-DC converter in parallel；Switch module including multiple groups switch；Multi-tap transformer, primary side are connected with power grid, and secondary side has multiple taps, and multiple taps are connected with the end that exchanges of N number of two-way AC-DC converter respectively by switch module；Control module, control module is communicated with electric vehicle, and switch module is controlled according to the voltage class of the power battery of electric vehicle to select a tap in multiple taps to be connected respectively to the exchange end of N number of two-way AC-DC converter and successively be started with controlling N number of two-way AC-DC converter, it charges to electric vehicle.The charging cabinet adapts to the voltage class of the power battery of electric vehicle using multi-tap transformer, and without DC-DC converter, structure and control strategy are more simple.The invention also discloses a kind of control methods of charging cabinet for electric vehicle.
Description
Technical field
It is the present invention relates to electric vehicle charging technical field, in particular to a kind of for the charging cabinet of electric vehicle and one
Control method of the kind for the charging cabinet of electric vehicle.
Background technique
There are many current electric vehicle professional standard, and the standard of the electric vehicle institute reference of different vendor's research and development is different,
Therefore, the quantity and voltage class of the power battery of different electric vehicles are also not quite similar.
In the related technology, it in order to guarantee that charging cabinet can adapt to the voltage class of the power battery of electric vehicle, generally needs
To increase DC-DC converter in charging cabinet, but due to including that multiple AC-DC converters and multiple DC-DC become in charging cabinet
Parallel operation makes the structure of charging cabinet and control become complicated, reduces the operation stability and maintainability of charging cabinet, and due to
The turn-on and turn-off of electronic switching device can generate switching loss in DC-DC converter, to reduce the efficiency of charging cabinet.
Summary of the invention
The purpose of the present invention aims to solve at least above-mentioned one of technological deficiency.
For this purpose, passing through multi-tap transformation an object of the present invention is to provide a kind of charging cabinet for electric vehicle
Device is to adapt to the voltage class of the power battery of electric vehicle, without DC-DC converter, so that structure and control strategy are more
Be it is simple, run it is more stable, reliable.
It is another object of the present invention to the control methods for proposing a kind of charging cabinet for electric vehicle.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of charging cabinet for electric vehicle, comprising:
N number of two-way AC-DC converter, N number of two-way AC-DC converter is in parallel, the DC terminal of N number of two-way AC-DC converter
It is connected by charge port with the electric vehicle, wherein N is the integer more than or equal to 1；Switch module, the switch module packet
Include multiple groups switch；Multi-tap transformer, the secondary side of the multi-tap transformer have multiple taps, in the multiple tap
Every group of switch in each tap and multiple groups switch is corresponding to be connected, with by the switch module respectively with it is described N number of pair
It is connected to the exchange end of AC-DC converter, the primary side of the multi-tap transformer is connected with power grid；Control module, the control
Molding block is communicated with the electric vehicle, and the control module is also led to each two-way AC-DC converter
Letter, the control module control to select the switch module according to the voltage class of the power battery of the electric vehicle
The exchange end that in the multiple tap tap is connected respectively to N number of two-way AC-DC converter is selected, and in selection
After one tap is connected respectively to the exchange end of N number of two-way AC-DC converter, the control module controls the N
A two-way AC-DC converter successively starts.
Charging cabinet according to an embodiment of the present invention for electric vehicle, is led to by control module and electric vehicle
Letter, to obtain the voltage class of the power battery of electric vehicle, and according to the voltage etc. of the power battery of the electric vehicle of acquisition
Grade controls switch module to select a tap in multiple taps to be connected respectively to N number of two-way AC-DC converter
Exchange end, control N number of two-way AC-DC converter and successively start, the DC terminal of N number of two-way AC-DC converter by charge port with
Electric vehicle, which is connected, realizes the charge function of electric vehicle.Therefore, the charging cabinet energy for electric vehicle of the embodiment of the present invention
It is enough to adapt to the voltage class of the power battery of electric vehicle by selecting a tap in multiple taps, without using
DC-DC converter so that the structure of charging cabinet and control strategy are more simple, and reduces derailing switch in DC-DC converter
The switching loss of part improves charge efficiency, while also improving the stability of charging cabinet operation, reliability and can safeguard
Property.
According to one embodiment of present invention, every group of switch includes three switches, and each tap includes three
Lead-out wire, three lead-out wires are corresponding with three switches to be connected.
According to one embodiment of present invention, the charging cabinet for electric vehicle further include: current-sharing module, it is described
Current-sharing module is communicated with the control module to receive the general objective charging current ICobj that the control module is sent,
And the current-sharing module is also communicated with each two-way AC-DC converter, and obtains pair being currently running
To the number of AC-DC converter, and according to the number for the two-way AC-DC converter being currently running and general objective charging electricity
Stream ICobj calculates the target charge current Iobj of single two-way AC-DC converter being currently running, and described in being calculated
Target charge current Iobj, which is sent to, each of is currently running two-way AC-DC converter.
Wherein, according to one embodiment of present invention, when the current-sharing module calculates the target charge current Iobj,
The current-sharing module allows to fill according to the number of the two-way AC-DC converter being currently running and single two-way AC-DC converter
Electric current Ic calculates current total permission charging current Itotal of the charging cabinet, and judges the general objective charging current
Whether ICobj is more than or equal to current total permission charging current Itotal of the charging cabinet；If it is, the target charging electricity
Flow the permission charging current Ic that Iobj is the single two-way AC-DC converter；If it is not, then the target charge current Iobj
It is the general objective charging current ICobj divided by the number for the two-way AC-DC converter being currently running.
According to one embodiment of present invention, the current-sharing module generates synchronization signal with predetermined period, and will be described same
Step signal is sent to each two-way AC-DC converter.
Wherein, according to one embodiment of present invention, the predetermined period is to control each two-way AC-DC converter
The carrier cycle of the pulse-width modulation PWM wave of middle electronic switch, wherein each two-way AC-DC converter is according to the synchronization
Signal is respectively adjusted the switching frequency of the PWM wave.
According to one embodiment of present invention, when each two-way AC-DC converter is to the appearance of the synchronization signal
Quarter is judged, wherein if the synchronization signal appears in the ascent stage of the PWM wave, the two-way AC-DC converter
Reduce the switching frequency of the PWM wave with preset step-length；If the synchronization signal appears in the decline stage of the PWM wave,
The two-way AC-DC converter increases the switching frequency of the PWM wave with the preset step-length.
Preferably, the synchronization signal can be sent to each two-way AC- by optical fiber cable by the current-sharing module
DC converter.
According to one embodiment of present invention, the line voltage of one tap of selection meets following relationship:
Uac < (η × Udc)/1.414
Wherein, Uac is the line voltage of one tap, and Udc is the DC voltage of the power battery of the electric vehicle,
η is conversion coefficient.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of control of charging cabinet for electric vehicle
Method processed, wherein the charging cabinet includes N number of two-way AC-DC converter in parallel, the switch module with multiple groups switch, more
The secondary side of tapped transformer, control module and current-sharing module, the multi-tap transformer has multiple taps, the multiple pumping
Every group of switch in each tap and the multiple groups switch in head it is corresponding it is connected with pass through the switch module respectively with the N
The exchange end of a two-way AC-DC converter is connected, and the primary side of the multi-tap transformer is connected with power grid, wherein N for greater than
Integer equal to 1, the control method is the following steps are included: the control module is communicated with the electric vehicle with basis
The voltage class of the power battery of the electric vehicle controls the switch module to select in the multiple tap
One tap is connected respectively to the exchange end of N number of two-way AC-DC converter；It is separately connected in one tap of selection
To after the exchange end of N number of two-way AC-DC converter, the control module and each two-way AC-DC converter are carried out
Communication is successively started with controlling N number of two-way AC-DC converter.
The control method of charging cabinet according to an embodiment of the present invention for electric vehicle, passes through control module and electric vehicle
It is communicated to be controlled switch module according to the voltage class of the power battery of electric vehicle to select multiple taps
In a tap be connected respectively to the exchange end of N number of two-way AC-DC converter, be connected respectively to N in a tap of selection
Behind the exchange end of a two-way AC-DC converter, control module is communicated N number of double to control with each two-way AC-DC converter
Successively start to AC-DC converter.Therefore, the control method of the charging cabinet for electric vehicle of the embodiment of the present invention can lead to
The voltage class for selecting a tap in multiple taps to adapt to the power battery of electric vehicle is crossed, without using DC-
DC converter so that the structure of charging cabinet and control strategy are more simple, and reduces switching device in DC-DC converter
Switching loss, improves the charge efficiency of charging cabinet, while also improving the stability of charging cabinet operation, reliability and can tie up
Shield property.
According to one embodiment of present invention, after controlling N number of two-way AC-DC converter and successively starting, the control
Method processed further include: the control module is communicated with the current-sharing module general objective charging current ICobj to be sent to
The current-sharing module；The current-sharing module is communicated with each two-way AC-DC converter to obtain pair being currently running
To the number of AC-DC converter, and according to the number for the two-way AC-DC converter being currently running and the general objective charging current
ICobj calculates the target charge current Iobj of single two-way AC-DC converter being currently running, and described in being calculated
Target charge current Iobj, which is sent to, each of is currently running two-way AC-DC converter.
Wherein, according to one embodiment of present invention, the target for calculating the single two-way AC-DC converter being currently running is filled
Electric current Iobj, specifically includes: the current-sharing module is according to the number of the two-way AC-DC converter being currently running and single two-way
The permission charging current Ic of AC-DC converter calculates current total permission charging current Itotal of the charging cabinet, and judges institute
State the current total permission charging current Itotal whether general objective charging current ICobj is more than or equal to the charging cabinet；If so,
Then the target charge current Iobj is the permission charging current Ic of the single two-way AC-DC converter；If it is not, then described
Target charge current Iobj is number of the general objective charging current ICobj divided by the two-way AC-DC converter being currently running.
According to one embodiment of present invention, the control method of the charging cabinet for electric vehicle further include: institute
It states current-sharing module and synchronization signal is generated with predetermined period, and the synchronization signal is sent to each two-way AC-DC and is converted
Device, wherein the predetermined period is the pulse-width modulation PWM wave of electronic switch in each two-way AC-DC converter of control
Carrier cycle；Each two-way AC-DC converter respectively carries out the switching frequency of the PWM wave according to the synchronization signal
Adjustment.
Wherein, according to one embodiment of present invention, the switching frequency of the PWM wave is adjusted, is specifically included: is every
A two-way AC-DC converter judges the current moment that goes out of the synchronization signal；If the synchronization signal appears in
The ascent stage of the PWM wave, the two-way AC-DC converter reduce the switching frequency of the PWM wave with preset step-length；If
The synchronization signal appears in the decline stage of the PWM wave, and the two-way AC-DC converter increases institute with the preset step-length
State the switching frequency of PWM wave.
Preferably, the synchronization signal can be sent to each two-way AC- by optical fiber cable by the current-sharing module
DC converter.
According to one embodiment of present invention, the line voltage of one tap of selection meets following relationship:
Uac < (η × Udc)/1.414
Wherein, Uac is the line voltage of one tap, and Udc is the DC voltage of the power battery of the electric vehicle,
η is conversion coefficient.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the system schematic according to the charging cabinet for electric vehicle of the embodiment of the present invention；
Fig. 2 is the flow chart according to the calculating target charge current Iobj of one embodiment of the invention；
Fig. 3 is the flow chart being adjusted to the switching frequency of PWM wave according to one embodiment of the invention；And
Fig. 4 is the flow chart according to the control method of the charging cabinet for electric vehicle of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
It is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is for purposes of simplicity and clarity, itself not indicate the relationship between discussed various embodiments and/or setting again.This
Outside, the present invention provides various specific techniques and material example, but those of ordinary skill in the art may be aware that
The applicable property of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it
The structure of "upper" may include the embodiment that the first and second features are formed as directly contacting, and also may include other feature shape
At the embodiment between the first and second features, such first and second feature may not be direct contact.
In the description of the present invention, it should be noted that unless otherwise specified and limited, term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can
, can also indirectly connected through an intermediary, for the ordinary skill in the art to be to be connected directly, it can basis
Concrete condition understands the concrete meaning of above-mentioned term.
With reference to the accompanying drawings come describe the embodiment of the present invention proposition for electric vehicle charging cabinet and be used for it is electronic
The control method of the charging cabinet of vehicle.
Fig. 1 is the system schematic according to the charging cabinet for electric vehicle of the embodiment of the present invention.As shown in Figure 1, should
Charging cabinet 100 for electric vehicle includes: N number of AC-DC converter, switch module 10, multi-tap transformer 20, control module
30。
Wherein, N number of two-way AC-DC converter be respectively two-way AC-DC converter 1, two-way AC-DC converter 2 ..., it is double
It is in parallel between N number of two-way AC-DC converter to AC-DC converter N, and the DC terminal of N number of two-way AC-DC converter passes through
Charge port is connected with electric vehicle 200, wherein N is the integer more than or equal to 1.Switch module 10 is switched including multiple groups.Multi-tap
The secondary side of transformer 20 has multiple taps, each different grades of voltage of tap output, each tap in multiple taps
With every group of switch in multiple groups switch is corresponding is connected, exchanged respectively with N number of two-way AC-DC converter with passing through switch module 10
End is connected, and the primary side of multi-tap transformer 20 is connected with power grid 300.Control module 30 is communicated with electric vehicle, and is controlled
Molding block 30 is also communicated with each two-way AC-DC converter, and control module 30 is according to the electricity of the power battery of electric vehicle
Pressure grade controls switch module 10 to select a tap in multiple taps to be connected respectively to N number of two-way AC-DC and become
The exchange end of parallel operation, and after a tap of selection is connected respectively to the exchange end of N number of two-way AC-DC converter, control mould
Block 30 controls N number of two-way AC-DC converter and successively starts.
According to one embodiment of present invention, it can be carried out by CAN bus between control module 30 and electric vehicle 200
Communication, and United Dispatching is carried out to the equipment in charging cabinet 100.Certainly, in other embodiments of the invention, control module 30
It can also be communicated by other communication lines with electric vehicle 200, realize the information exchange with electric vehicle 200.
Specifically, as shown in Figure 1, switch module 10 include multiple groups switch 101,102 ..., 10J, multiple groups switch in it is every
Group switch is corresponding with each tap in multiple taps to be connected, and J is the integer more than or equal to 2.Every group of switch includes three switches,
Each tap includes three lead-out wires, and three lead-out wires are corresponding with three switches to be connected.Also, each tap passes through corresponding one
It is connect with ac bus connecting terminal block after group switch.
Also, each two-way AC-DC converter is by two-way AC-DC controller, electronic switch, capacitor, inductance and control
The switch of two-way AC-DC converter on-off forms, the exchange end of each two-way AC-DC converter and ac bus connecting terminal block
Connection, the DC terminal of each two-way AC-DC converter are connect with DC bus connecting terminal block, and DC bus connecting terminal block is most
It is connect eventually by charge port with electric vehicle 200, when charging process of the charging cabinet for realizing electric vehicle, the two-way AC-
DC converter is for rectifying；When the capacity etc. for the power battery for needing to detect electric vehicle, when needing to discharge to power battery, electricity
Line structure is constant, but is alternating current by the DC inverter of power battery by the inversion function of two-way AC-DC converter.It is excellent
Choosing, electronic switch can be IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar crystal
Pipe), switching devices, the specific structure of two-way AC-DC converter such as silicon-controlled be just no longer described in detail here.Wherein, two-way AC-DC control
Device processed is final real by output PWM (Pulse Width Modulation, pulse width modulation) wave driving electronic switch work
Existing two-way AC-DC converter realizes constant-current charging function.
Specifically, control module 30 is completed with the connection judgment of electric vehicle and information exchange to confirm permission charging cabinet
After starting, control charging cabinet starting, then control module 30 is according to the voltage class of the power battery of electric vehicle to switching molding
The exchange end that block 10 is controlled to select a tap in multiple taps to be connected respectively to N number of two-way AC-DC converter, from
And it controls N number of two-way AC-DC converter and successively starts.In order to guarantee that charging cabinet can be stablized, reliably run, one of selection
The line voltage of tap meets shown in following formula (1):
Uac < (η × Udc)/1.414 (1)
Wherein, Uac is the line voltage of a tap, and Udc is the DC voltage of the power battery of electric vehicle, and η is conversion
Coefficient.
In an embodiment of the present invention, as shown in Figure 1, the above-mentioned charging cabinet for electric vehicle further includes current-sharing module
40, current-sharing module 40 is communicated with control module 30 to receive the general objective charging current ICobj of the transmission of control module 30, and
And current-sharing module 40 is also communicated with each two-way AC-DC converter, and obtains the two-way AC-DC converter being currently running
Number, and according to the number and general objective charging current ICobj of the two-way AC-DC converter being currently running calculating transporting
The target charge current Iobj of capable single two-way AC-DC converter, and the target charge current Iobj being calculated is sent
To each of being currently running two-way AC-DC converter.
Wherein, the target charge current Iobj for the single two-way AC-DC converter being currently running is calculated in current-sharing module 40
When, current-sharing module 40 allows to fill according to the number of the two-way AC-DC converter being currently running and single two-way AC-DC converter
Electric current Ic calculates current total permission charging current Itotal of charging cabinet, and judges whether general objective charging current ICobj is big
In the current total permission charging current Itotal for being equal to charging cabinet, if it is, target charge current Iobj is single two-way AC-
The permission charging current Ic of DC converter；If it is not, then target charge current Iobj is general objective charging current ICobj divided by just
In the number of the two-way AC-DC converter of operation.
Preferably, according to one embodiment of present invention, current-sharing module 40 and control module 30 can by CAN bus into
Row communication, can also be communicated between current-sharing module 40 and each two-way AC-DC converter by CAN bus.
Specifically, current-sharing module 40 obtains the operating status of each two-way AC-DC converter, obtains in judgement more than 1
After (including 1) two-way AC-DC converter starts successfully, current-sharing module 40 starts to calculate each two-way AC-DC being currently running
The target charge current Iobj of converter.Current-sharing module 40 is in the general objective charging current for receiving the transmission of control module 30
After ICobj, the number for the two-way AC-DC converter being currently running can be counted first, and obtained according to statistics
The number M for the two-way AC-DC converter being currently running and the permission charging current Ic of single two-way AC-DC converter calculate charging
Then current total permission charging current Itotal, the i.e. Itotal=M × Ic of cabinet allow charging current Itotal and catalogue to total
Mark charging current ICobj is judged, if general objective charging current ICobj is more than or equal to the current of charging cabinet and always allows to charge
Electric current Itotal, then target charge current Iobj is the permission charging current Ic of single two-way AC-DC converter, if general objective
Charging current ICobj is less than current total permission charging current Itotal of charging cabinet, then target charge current Iobj is general objective
Charging current ICobj the number M divided by the two-way AC-DC converter being currently running, i.e. Iobj=ICobj/M.
According to one embodiment of present invention, as shown in Fig. 2, calculating the single two-way AC-DC converter being currently running
Specific step is as follows by target charge current Iobj:
S101, current-sharing module obtain the number M for the two-way AC-DC converter being currently running.
S102, judges whether the number M for the two-way AC-DC converter being currently running is more than or equal to 1.If so, executing step
Rapid S103；If not, return step S101 continues to obtain.
S103, according to the permission of the number M for the two-way AC-DC converter being currently running and single two-way AC-DC converter
Current total the permission charging current Itotal, i.e. Itotal=M × Ic of charging current Ic calculating charging cabinet.
S104, judges whether general objective charging current ICobj is more than or equal to current total permission charging current of charging cabinet
Itotal.If so, executing step S106；If not, executing step S105.
S105, target charge current Iobj are that general objective charging current ICobj is converted divided by the two-way AC-DC being currently running
The number M of device, i.e. Iobj=ICobj/M.
S106, target charge current Iobj are the permission charging current Ic of single two-way AC-DC converter.
In addition, according to one embodiment of present invention, current-sharing module 40 generates synchronization signal with predetermined period, and will synchronize
Signal is sent to each two-way AC-DC converter, to inhibit the DC current circulation between each two-way AC-DC converter.Its
In, predetermined period is the carrier cycle of the pulse-width modulation PWM wave of electronic switch in each two-way AC-DC converter of control, each
Two-way AC-DC converter is respectively adjusted the switching frequency of PWM wave according to synchronization signal, makes each two-way AC-DC transformation
The PWM wave initial time of device levels off to the synchronization signal generation moment.
Preferably, synchronization signal can be sent to each two-way AC-DC converter by optical fiber cable by current-sharing module 40, with
Reduce the interference that generates to synchronization signal of external environment, it is ensured that system can stable operation, and using optical fiber cable transmission signal,
Transmission speed is fast, and real-time is good.
Wherein, when the switching frequency to PWM wave is adjusted, each two-way AC-DC converter requires to believe synchronous
Number the current moment that goes out judged that, if synchronization signal appears in the ascent stage of PWM wave, two-way AC-DC converter is with default
The switching frequency of the reduction PWM wave of step-length such as 0.1%；If synchronization signal appears in the decline stage of PWM wave, two-way AC-DC
Converter increases the switching frequency of PWM wave with preset step-length such as 0.1%, also, allows to increase or reduce the switch frequency of PWM wave
The range of rate is ± the 1% of the switching frequency of electronic switch.
According to one embodiment of present invention, as shown in figure 3, each two-way AC-DC converter is distinguished according to synchronization signal
It is adjusted that specific step is as follows to the switching frequency of PWM wave:
S201, current-sharing module generate synchronization signal with predetermined period.
Synchronization signal is sent to each two-way AC-DC converter by S202, current-sharing module.
S203, each two-way AC-DC converter receive synchronization signal by optical fiber cable.
S204, judges whether synchronization signal appears in the ascent stage of PWM wave, and each two-way AC-DC transformation
Device requires to judge the current moment that goes out of synchronization signal.If so, executing step S205；If not, executing step S206.
S205, two-way AC-DC converter reduce the switching frequency of PWM wave with preset step-length such as 0.1%.
S206, two-way AC-DC converter increase the switching frequency of PWM wave with preset step-length such as 0.1%.
S207, limit the switching frequency of final PWM wave offset be electronic switch switching frequency -1%.
S208, limit the switching frequency of final PWM wave offset be electronic switch switching frequency+1%.
In conclusion the charging cabinet according to an embodiment of the present invention for electric vehicle, passes through control module and electric vehicle
It is communicated, to obtain the voltage class of the power battery of electric vehicle, and the power battery of the electric vehicle according to acquisition
Voltage class switch module is controlled to select a tap in multiple taps to be connected respectively to N number of two-way AC-DC
The exchange end of converter controls N number of two-way AC-DC converter and successively starts, and the DC terminal of N number of two-way AC-DC converter passes through
Charge port is connected with electric vehicle realizes the charge function of electric vehicle.Therefore, the embodiment of the present invention for electric vehicle
Charging cabinet can adapt to the voltage class of the power battery of electric vehicle by selecting a tap in multiple taps, thus
Without DC-DC converter, so that the structure of charging cabinet and control strategy are more simple, and reduce DC-DC converter
The switching loss of middle switching device improves charge efficiency, at the same also improve charging cabinet operation stability, reliability and
It is maintainable.
Fig. 4 is the flow chart according to the control method of the charging cabinet for electric vehicle of the embodiment of the present invention.Wherein, such as
Shown in Fig. 1, charging cabinet includes N number of two-way AC-DC converter in parallel, the switch module with multiple groups switch, multi-tap transformation
Device, control module and current-sharing module, the secondary side of multi-tap transformer have multiple taps, each tap in multiple taps with
Every group of switch in multiple groups switch be corresponding to be connected to exchange end phase with N number of two-way AC-DC converter respectively by switch module
Even, the primary side of multi-tap transformer is connected with power grid, wherein N is the integer more than or equal to 1.As shown in figure 4, this is used for electricity
The control method of the charging cabinet of motor-car the following steps are included:
S1, control module communicated with electric vehicle with according to the voltage class of the power battery of electric vehicle to switch
The exchange end that module is controlled to select a tap in multiple taps to be connected respectively to N number of two-way AC-DC converter.
According to one embodiment of present invention, it can be communicated by CAN bus between control module and electric vehicle,
And United Dispatching is carried out to the equipment in charging cabinet.Certainly, in other embodiments of the invention, control module can also pass through it
He communicates communication line with electric vehicle, realizes the information exchange with electric vehicle.
S2, after a tap of selection is connected respectively to the exchange end of N number of two-way AC-DC converter, control module with
Each two-way AC-DC converter is communicated to control N number of two-way AC-DC converter and successively start.
Specifically, control module is completed to allow charging cabinet to open to confirm with the connection judgment of electric vehicle and information exchange
After dynamic, control charging cabinet starting, then control module according to the voltage class of the power battery of electric vehicle to switch module into
Row control is to select a tap in multiple taps to be connected respectively to the exchange end of N number of two-way AC-DC converter, to control
N number of two-way AC-DC converter successively starts.In order to guarantee that charging cabinet can be stablized, reliably run, a tap of selection
Line voltage should meet shown in above-mentioned formula (1).
In an embodiment of the present invention, after controlling N number of two-way AC-DC converter and successively starting, control module with flow
Module is communicated so that general objective charging current ICobj is sent to current-sharing module, and current-sharing module and each two-way AC-DC are converted
Device is communicated to obtain the number for the two-way AC-DC converter being currently running, and is converted according to the two-way AC-DC being currently running
The number and general objective charging current ICobj of device calculate the target charge current for the single two-way AC-DC converter being currently running
Iobj, and the target charge current Iobj being calculated is sent to and each of is currently running two-way AC-DC converter.
Wherein, current-sharing module is according to the number and general objective charging current ICobj of the two-way AC-DC converter being currently running
The target charge current Iobj for calculating the single two-way AC-DC converter being currently running is specifically included: current-sharing module is according to
The permission charging current Ic of the number of the two-way AC-DC converter of operation and single two-way AC-DC converter calculates charging cabinet
Current total permission charging current Itotal, and judge whether general objective charging current ICobj is more than or equal to the current total of charging cabinet
Allow charging current Itotal, if it is, target charge current Iobj allows the electricity that charges for single two-way AC-DC converter
Flow Ic；If it is not, then target charge current Iobj is that general objective charging current ICobj becomes divided by the two-way AC-DC being currently running
The number of parallel operation.
Preferably, according to one embodiment of present invention, current-sharing module can be led to control module by CAN bus
Letter, can also be communicated between current-sharing module and each two-way AC-DC converter by CAN bus.
Specifically, it as shown in Fig. 2, current-sharing module obtains the operating status of each two-way AC-DC converter, is obtained in judgement
After more than 1 (including 1) AC-DC converter starts successfully, current-sharing module starts to calculate each two-way AC-DC being currently running
The target charge current Iobj of converter.Current-sharing module receive control module transmission general objective charging current ICobj after,
The number for the two-way AC-DC converter being currently running can be counted, and be currently running according to what statistics obtained first
Two-way AC-DC converter number M and single two-way AC-DC converter permissions charging current Ic calculating charging cabinet it is current
It is total to allow charging current Itotal, i.e. Itotal=Ic × M, then allow charging current Itotal and general objective charging electricity to total
Stream ICobj is judged, if general objective charging current ICobj is more than or equal to current total permission charging current of charging cabinet
Itotal, then target charge current Iobj is the permission charging current Ic of single two-way AC-DC converter, if general objective charges
Electric current ICobj is less than current total permission charging current Itotal of charging cabinet, then target charge current Iobj is general objective charging
Electric current ICobj the number M divided by the two-way AC-DC converter being currently running, i.e. Iobj=ICobj/M.
In addition, according to one embodiment of present invention, current-sharing module also generates synchronization signal with predetermined period, and will synchronize
Signal is sent to each two-way AC-DC converter, to inhibit the DC current circulation between each two-way AC-DC converter.Its
In, predetermined period is the carrier cycle of the pulse-width modulation PWM wave of electronic switch in each two-way AC-DC converter of control, each
Two-way AC-DC converter is respectively adjusted the switching frequency of PWM wave according to synchronization signal, makes each two-way AC-DC transformation
The PWM wave initial time of device levels off to the synchronization signal generation moment.
As shown in figure 3, the detailed process being adjusted to the switching frequency of PWM wave includes: each two-way AC-DC converter
The current moment that goes out of synchronization signal is judged, if synchronization signal appears in the ascent stage of PWM wave, two-way AC-DC transformation
Device reduces the switching frequency of PWM wave with preset step-length such as 0.1%；If synchronization signal appears in the decline stage of PWM wave, double
Increase the switching frequency of PWM wave with preset step-length such as 0.1% to AC-DC converter, also, allows to increase or reduce PWM wave
Switching frequency range be electronic switch switching frequency ± 1%.
Preferably, synchronization signal can be sent to each two-way AC-DC converter by optical fiber cable by current-sharing module, to subtract
The interference that few external environment generates synchronization signal, it is ensured that system can stable operation, and signal, biography are transmitted using optical fiber cable
Defeated speed is fast, and real-time is good.
The control method of charging cabinet according to an embodiment of the present invention for electric vehicle, passes through control module and electric vehicle
It is communicated to be controlled switch module according to the voltage class of the power battery of electric vehicle to select multiple taps
In a tap be connected respectively to the exchange end of N number of two-way AC-DC converter, be connected respectively to N in a tap of selection
Behind the exchange end of a two-way AC-DC converter, control module is communicated N number of double to control with each two-way AC-DC converter
Successively start to AC-DC converter.Therefore, the control method of the charging cabinet for electric vehicle of the embodiment of the present invention can lead to
The voltage class for selecting a tap in multiple taps to adapt to the power battery of electric vehicle is crossed, without using DC-
DC converter so that the structure of charging cabinet and control strategy are more simple, and reduces switching device in DC-DC converter
Switching loss, improves the charge efficiency of charging cabinet, while also improving the stability of charging cabinet operation, reliability and can tie up
Shield property.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.The more specific example (non-exhaustive list) of computer-readable medium include the following: there is the electricity of one or more wirings
Interconnecting piece (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (16)
1. a kind of charging cabinet for electric vehicle characterized by comprising
N number of two-way AC-DC converter, N number of converter is in parallel, and the DC terminal of N number of two-way AC-DC converter is by filling
Power port is connected with the electric vehicle, wherein N is the integer more than or equal to 1；
Switch module, the switch module include multiple groups switch；
Multi-tap transformer, the secondary side of the multi-tap transformer have multiple taps, each pumping in the multiple tap
Head and every group of switch in multiple groups switch are corresponding connected, with pass through the switch module respectively with N number of two-way AC-DC
The exchange end of converter is connected, and the primary side of the multi-tap transformer is connected with power grid；
Control module, the control module are communicated with the electric vehicle, and the control module also with it is each described double
It is communicated to AC-DC converter, the control module is according to the voltage class of the power battery of the electric vehicle to described
Switch module is controlled to select a tap in the multiple tap to be connected respectively to N number of two-way AC-DC transformation
The exchange end of device, and behind the exchange end that one tap of selection is connected respectively to N number of two-way AC-DC converter,
The control module controls N number of two-way AC-DC converter and successively starts.
2. being used for the charging cabinet of electric vehicle as described in claim 1, which is characterized in that every group of switch includes three and open
It closes, each tap includes three lead-out wires, and three lead-out wires are corresponding with three switches to be connected.
3. being used for the charging cabinet of electric vehicle as described in claim 1, which is characterized in that further include:
Current-sharing module, the current-sharing module are communicated with the control module to receive the general objective that the control module is sent
Charging current ICobj, and the current-sharing module is also communicated with each two-way AC-DC converter, and is obtained and transported
The number of capable two-way AC-DC converter, and number and the general objective according to the two-way AC-DC converter being currently running
Charging current ICobj calculates the target charge current Iobj for the single two-way AC-DC converter being currently running, and will be calculated
The target charge current Iobj be sent to and each of be currently running two-way AC-DC converter.
4. being used for the charging cabinet of electric vehicle as claimed in claim 3, which is characterized in that described in being calculated in the current-sharing module
When target charge current Iobj, the current-sharing module is according to the number of the two-way AC-DC converter being currently running and single two-way
The permission charging current Ic of AC-DC converter calculates current total permission charging current Itotal of the charging cabinet, and judges institute
State the current total permission charging current Itotal whether general objective charging current ICobj is more than or equal to the charging cabinet；
If it is, the target charge current Iobj is the permission charging current Ic of the single two-way AC-DC converter；
If it is not, then the target charge current Iobj is that the general objective charging current ICobj is two-way divided by what is be currently running
The number of AC-DC converter.
5. being used for the charging cabinet of electric vehicle as claimed in claim 3, which is characterized in that the current-sharing module is with predetermined period
Synchronization signal is generated, and the synchronization signal is sent to each two-way AC-DC converter.
6. being used for the charging cabinet of electric vehicle as claimed in claim 5, which is characterized in that the predetermined period is that control is each
The carrier cycle of the PWM wave of electronic switch in the two-way AC-DC converter, wherein each two-way AC-DC converter root
The switching frequency of the PWM wave is adjusted respectively according to the synchronization signal.
7. being used for the charging cabinet of electric vehicle as claimed in claim 6, which is characterized in that each two-way AC-DC transformation
Device judges the current moment that goes out of the synchronization signal, wherein
If the synchronization signal appears in the ascent stage of the PWM wave, the two-way AC-DC converter is subtracted with preset step-length
The switching frequency of the small PWM wave；
If the synchronization signal appears in the decline stage of the PWM wave, the two-way AC-DC converter is with the default step
The long switching frequency for increasing the PWM wave.
8. being used for the charging cabinet of electric vehicle as claimed in claim 5, which is characterized in that the current-sharing module passes through optical fiber cable
The synchronization signal is sent to each two-way AC-DC converter.
9. being used for the charging cabinet of electric vehicle as described in claim 1, which is characterized in that the line of one tap of selection
Voltage meets following relationship:
Uac < (η × Udc)/1.414
Wherein, Uac is the line voltage of one tap, and Udc is the DC voltage of the power battery of the electric vehicle, and η is
Conversion coefficient.
10. a kind of control method of the charging cabinet for electric vehicle, which is characterized in that the charging cabinet includes the N number of of parallel connection
Two-way AC-DC converter, switch module, multi-tap transformer, control module and current-sharing module with multiple groups switch are described more
The secondary side of tapped transformer has multiple taps, every group in each tap and multiple groups switch in the multiple tap
Switch is corresponding to be connected to be connected respectively with the end that exchanges of N number of two-way AC-DC converter by the switch module, described more
The primary side of tapped transformer is connected with power grid, wherein N is the integer more than or equal to 1, and the control method includes following step
It is rapid:
The control module is communicated with the electric vehicle according to the voltage class of the power battery of the electric vehicle
The switch module is controlled to select a tap in the multiple tap to be connected respectively to N number of two-way AC-
The exchange end of DC converter；
After one tap of selection is connected respectively to the exchange end of N number of two-way AC-DC converter, the control mould
Block is communicated with each two-way AC-DC converter to control N number of two-way AC-DC converter and successively start.
11. control method as claimed in claim 10, which is characterized in that controlling N number of two-way AC-DC converter successively
After starting, the control method further include:
The control module is communicated with the current-sharing module general objective charging current ICobj is sent to the stream mould
Block；
The current-sharing module is communicated with each two-way AC-DC converter to obtain the two-way AC-DC being currently running and become
The number of parallel operation, and calculated according to the number for the two-way AC-DC converter being currently running and the general objective charging current ICobj
The target charge current Iobj for the single two-way AC-DC converter being currently running, and the target being calculated is charged
Electric current Iobj, which is sent to, each of is currently running two-way AC-DC converter.
12. control method as claimed in claim 11, which is characterized in that calculate the single two-way AC-DC transformation being currently running
The target charge current Iobj of device, specifically includes:
The current-sharing module is according to the number for the two-way AC-DC converter being currently running and permitting for single two-way AC-DC converter
Perhaps charging current Ic calculates current total permission charging current Itotal of the charging cabinet, and judges the general objective charging current
Whether ICobj is more than or equal to current total permission charging current Itotal of the charging cabinet；
If it is, the target charge current Iobj is the permission charging current Ic of the single two-way AC-DC converter；
If it is not, then the target charge current Iobj is that the general objective charging current ICobj is two-way divided by what is be currently running
The number of AC-DC converter.
13. control method as claimed in claim 10, which is characterized in that further include:
The current-sharing module generates synchronization signal with predetermined period, and the synchronization signal is sent to each two-way AC-
DC converter, wherein the predetermined period is the load of the PWM wave of electronic switch in each two-way AC-DC converter of control
Wave period；
Each two-way AC-DC converter is respectively adjusted the switching frequency of the PWM wave according to the synchronization signal.
14. control method as claimed in claim 13, which is characterized in that be adjusted, have to the switching frequency of the PWM wave
Body includes:
Each two-way AC-DC converter judges the current moment that goes out of the synchronization signal；
If the synchronization signal appears in the ascent stage of the PWM wave, the two-way AC-DC converter is subtracted with preset step-length
The switching frequency of the small PWM wave；
If the synchronization signal appears in the decline stage of the PWM wave, the two-way AC-DC converter is with the default step
The long switching frequency for increasing the PWM wave.
15. control method as claimed in claim 13, which is characterized in that the current-sharing module passes through optical fiber cable for the synchronization
Signal is sent to each two-way AC-DC converter.
16. control method as claimed in claim 10, which is characterized in that the line voltage of one tap of selection meet with
Lower relationship:
Uac < (η × Udc)/1.414
Wherein, Uac is the line voltage of one tap, and Udc is the DC voltage of the power battery of the electric vehicle, and η is
Conversion coefficient.
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| CN201410728378.3A CN105720663B (en) | 2014-12-03 | 2014-12-03 | Charging cabinet and its control method for electric vehicle |
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| CN201410728378.3A CN105720663B (en) | 2014-12-03 | 2014-12-03 | Charging cabinet and its control method for electric vehicle |
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| CN105720663B true CN105720663B (en) | 2018-12-21 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106218430B (en) * | 2016-08-11 | 2019-04-05 | 西安特锐德智能充电科技有限公司 | A kind of charging system and method for Auto-matching electric car BMS accessory power supply voltage class |
| JP6358304B2 (en) * | 2016-09-30 | 2018-07-18 | 株式会社オートネットワーク技術研究所 | Vehicle power supply |
| CN106515792B (en) * | 2016-11-17 | 2018-06-22 | 中车株洲电力机车有限公司 | A kind of rail vehicle section method of controlling security and device |
| CN112910036B (en) * | 2021-01-21 | 2022-08-09 | 重庆新源创实业有限公司 | Charging control method, device and system |
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| CN201383770Y (en) * | 2009-04-23 | 2010-01-13 | 赵维平 | Solar car charging device |
| CN202872409U (en) * | 2012-09-27 | 2013-04-10 | 比亚迪股份有限公司 | Electric vehicle charging system and charging cabinet |
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| CN103683387A (en) * | 2013-11-15 | 2014-03-26 | 小米科技有限责任公司 | Charger, charging method and device, and control chip |
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| US8928283B2 (en) * | 2009-10-14 | 2015-01-06 | Fdk Corporation | Electricity storage system having a plurality of series-connected storage cells |
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| CN201383770Y (en) * | 2009-04-23 | 2010-01-13 | 赵维平 | Solar car charging device |
| JP2014011920A (en) * | 2012-07-02 | 2014-01-20 | Rohm Co Ltd | Battery control circuit, battery module, power-supply circuit, and household rechargeable battery and vehicle using them |
| CN202872409U (en) * | 2012-09-27 | 2013-04-10 | 比亚迪股份有限公司 | Electric vehicle charging system and charging cabinet |
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