CN108155796A - The control method of electric vehicle and its DC-DC converter and DC-DC converter - Google Patents
The control method of electric vehicle and its DC-DC converter and DC-DC converter Download PDFInfo
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- CN108155796A CN108155796A CN201611099658.8A CN201611099658A CN108155796A CN 108155796 A CN108155796 A CN 108155796A CN 201611099658 A CN201611099658 A CN 201611099658A CN 108155796 A CN108155796 A CN 108155796A
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- bridges
- switching tube
- total time
- switch pipe
- control
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Abstract
The invention discloses the control methods of a kind of electric vehicle and its DC DC converters and DC DC converters, wherein, DC DC converters include H bridges, and H bridges include first switch pipe, second switch pipe, third switching tube and the 4th switching tube, control method and include the following steps：During by being controlled such that DC DC converters work to H bridges, the total time TA for controlling H bridges in the first way is obtained；Obtain the total time TB for controlling H bridges in a second manner；Judge the relationship between total time TA and total time TB；The mode controlled according to the relationship selection between total time TA and total time TB H bridges, to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube, so that the fever relative equilibrium of first to fourth switching tube in H bridges, the working life of switching tube in H bridges is improved.
Description
Technical field
The present invention relates to electric vehicle engineering field, more particularly to a kind of control method of DC-DC converter, a kind of DC-
DC converters and a kind of electric vehicle.
Background technology
DC-DC converter is always the important component part of field of power electronics, along with the commercialized hair of electric vehicle
Exhibition, DC-DC converter have also become one of important spare part on electric vehicle.The topological structure of DC-DC converter have very much,
Medium-and-large-sized power domain, full bridge PWM converter are a kind of most commonly used topologys.
Wherein, the control mode of full bridge PWM converter has very much, and uses the control of phase shift modulation in the relevant technologies mostly
Mode and the control mode of down tube modulation.However, using phase shift modulation control mode when, advanced arm Sofe Switch easy to implement,
And lagging leg is not easy to realize Sofe Switch, so as to which lagging leg is more serious than the fever of advanced arm；During the control mode modulated using down tube, on
Sofe Switch easy to implement is managed, and down tube is not easy to realize Sofe Switch, so as to which down tube is more serious than upper tube fever.
Therefore, both the above control mode can lead to switching tube fever serious problems, influence the working life of switching tube.
Invention content
One of the technical issues of the present invention is directed to solve at least to a certain extent in above-mentioned technology.For this purpose, the present invention
First purpose be to propose a kind of control method of DC-DC converter, enables to first to fourth switching tube in H bridges
Fever relative equilibrium improves the working life of switching tube in H bridges.
Second object of the present invention is to propose a kind of DC-DC converter.Third object of the present invention is to propose
A kind of electric vehicle.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of control method of DC-DC converter,
In, the DC-DC converter includes H bridges, and the H bridges include first switch pipe, second switch pipe, third switching tube and the 4th and open
Guan Guan, wherein, the first switch pipe and the second switch pipe form the first bridge arm, the third switching tube and the described 4th
Switching tube forms the second bridge arm, and the control method includes the following steps：Obtain the total time for controlling the H bridges in the first way
TA, wherein, when controlling the H bridges with the first method, using first bridge arm as leading-bridge, and by second bridge
Arm is as lagging leg；The total time TB for controlling the H bridges in a second manner is obtained, wherein, institute is controlled with the second method
When stating H bridges, using second bridge arm as leading-bridge, and using first bridge arm as lagging leg；When judging described total
Between relationship between TA and the total time TB；It is selected according to the relationship between the total time TA and the total time TB to institute
The mode that H bridges are controlled is stated, to be carried out to the first switch pipe, second switch pipe, third switching tube and the 4th switching tube
Temperature equalization controls.
The control method of DC-DC converter according to embodiments of the present invention when DC-DC converter is worked, obtains
In the first way control H bridges total time TA and in a second manner control H bridges total time TB, then judge total time TA and always
Relationship between time TB, the mode finally controlled according to the relationship selection between total time TA and total time TB H bridges,
To carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube so that each switch
The fever relative equilibrium of pipe in the case where not increasing cost, improves the working life of switching tube in H bridges, so as to extend DC-
The life cycle of DC converters.
In order to achieve the above objectives, a kind of DC-DC converter that another aspect of the present invention embodiment proposes, including：H bridges, institute
It states H bridges and includes first switch pipe, second switch pipe, third switching tube and the 4th switching tube, wherein, the first switch pipe and institute
It states second switch pipe and forms the first bridge arm, the third switching tube and the 4th switching tube form the second bridge arm；Control module,
The control module controls total time TA of the H bridges for acquisition and controls the H bridges in a second manner in the first way
Total time TB, and judge the relationship between the total time TA and the total time TB and according to the total time TA and institute
The mode that the selection of the relationship between total time TB controls the H bridges is stated, with to the first switch pipe, second switch
Pipe, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, when controlling the H bridges with the first method, institute
Control module is stated using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；With described second
When mode controls the H bridges, the control module using second bridge arm as leading-bridge, and using first bridge arm as
Lagging leg.
DC-DC converter according to embodiments of the present invention when being actuated for work, is obtained by control module with first
Mode controls total time TA of H bridges and controls the total time TB of H bridges in a second manner, then judges total time TA and total time TB
Between relationship, finally according to the mode that is controlled H bridges of relationship selection between total time TA and total time TB, with to the
One switching tube, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that the hair of each switching tube
Hot relative equilibrium in the case where not increasing cost, improves the working life of switching tube in H bridges, so as to extend life cycle.
In addition, the embodiment of the present invention also proposed a kind of electric vehicle, including above-mentioned DC-DC converter.
The electric vehicle of the embodiment of the present invention by above-mentioned DC-DC converter, can be realized and first in H bridges is opened
Guan Guan, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that the fever phase of each switching tube
To balance, in the case where not increasing cost, the working life of switching tube in H bridges is improved, so as to extend DC-DC converter
Life cycle.
Description of the drawings
Fig. 1 is the circuit diagram according to the DC-DC converter of one embodiment of the invention；
Fig. 2 is the flow chart according to the control method of the DC-DC converter of the embodiment of the present invention；
Fig. 3 is four when being controlled using first method the H bridges switching tube according to one embodiment of the invention
Drive waveforms schematic diagram；
Fig. 4 is four when being controlled using second method the H bridges switching tube according to one embodiment of the invention
Drive waveforms schematic diagram；
Fig. 5 is the flow chart according to the control method of the DC-DC converter of a specific embodiment of the invention；
Fig. 6 is the block diagram according to the electric vehicle of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe the embodiment of the present invention proposition DC-DC converter control method, DC-DC converter
And the electric vehicle with the DC-DC converter.
As shown in Figure 1, DC-DC converter according to an embodiment of the invention includes H bridges, H bridges may include first switch
Pipe Q1, second switch pipe Q2, third switching tube Q3 and the 4th switching tube Q4.Wherein, first switch pipe Q1 and second switch pipe Q2
The first bridge arm is formed, third switching tube Q3 and the 4th switching tube Q4 form the second bridge arm, first switch pipe Q1 and second switch pipe
Between Q2 there is first node A, there is second node B between third switching tube Q3 and the 4th switching tube Q4.
Also, as shown in Figure 1, the DC-DC converter further includes transformer, the first inductance L1, the first capacitance C1, the second electricity
Sense L2 and the second capacitance C2, the 5th switching tube Q5, the 6th switching tube Q6, one end of the first inductance L1 are connected with first node A, the
The other end of one inductance L1 is connected with one end of the first capacitance C1, the other end of the first capacitance C1 and the armature winding of transformer
One end is connected, and the other end of the armature winding of transformer is connected with second node B.The secondary windings of transformer connects the 5th respectively
Switching tube Q5 and the 6th switching tube Q6, the second inductance L2 and the second capacitance C2 are connected to the output terminal of DC-DC converter.
In an embodiment of the present invention, as shown in Fig. 2, the control method of above-mentioned DC-DC converter includes the following steps：
S1 when DC-DC converter is worked, obtains the total time TA for controlling H bridges in the first way, wherein, with institute
When stating the first method control H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lag bridge
Arm.
S2 obtains the total time TB for controlling H bridges in a second manner, wherein, when controlling the H bridges with the second method,
Using second bridge arm as leading-bridge, and using first bridge arm as lagging leg.
According to one embodiment of present invention, it when controlling the H bridges with the first method, exports to first switch pipe Q1
Control signal and output to second switch pipe Q2 control signal is complementary and output to third switching tube Q3 control signal
With exporting to the control signal complementation of the 4th switching tube Q4, and first switch pipe Q1 previous phase angles super than the 4th switching tube Q4
It opens and second switch pipe Q2 previous phase angles super than third switching tube Q3 is open-minded.
Specifically, the drive of the drive waveforms of first switch pipe Q1, the drive waveforms of second switch pipe Q2, third switching tube Q3
Voltage U between two bridge arms of dynamic waveform, the drive waveforms of the 4th switching tube Q4 and H bridgesABWaveform is as shown in Figure 3.From Fig. 3
It can obtain, the control signal of Q1, Q2 are complementary in four switching tubes of H bridges, and the control signal of Q3, Q4 are complementary, diagonal wiretap
Pipe Q1 is super than Q4, and previous phase angle is open-minded, and Q2 is super than Q3, and previous phase angle is open-minded.Also, by adjusting the big of the phase angle
It is small to adjust output voltage.
Also, when controlling the H bridges with the second method, export to the control signal of first switch pipe Q1 with exporting extremely
The control signal of second switch pipe Q2 is complementary and exports to the control signal of third switching tube Q3 and output to the 4th switching tube
The control signal of Q4 is complementary, and the 4th switching tube Q4 previous phase angles super than first switch pipe Q1 are opened and third switch
Pipe Q3 is super than second switch pipe Q2, and previous phase angle is open-minded.
Specifically, the drive of the drive waveforms of first switch pipe Q1, the drive waveforms of second switch pipe Q2, third switching tube Q3
Voltage U between two bridge arms of dynamic waveform, the drive waveforms of the 4th switching tube Q4 and H bridgesABWaveform is as shown in Figure 4.From Fig. 4
It can obtain, the control signal of Q1, Q2 are complementary in four switching tubes of H bridges, and the control signal of Q3, Q4 are complementary, diagonal wiretap
Pipe Q4 is super than Q1, and previous phase angle is open-minded, and Q3 is super than Q2, and previous phase angle is open-minded.Equally, by adjusting the big of the phase angle
It is small to adjust output voltage.
S3 judges the relationship between total time TA and total time TB.
S4, according to the mode that the relationship selection between total time TA and total time TB controls H bridges, to open first
Guan Guan, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control.
Wherein, it should be noted that in the course of work of DC-DC converter, if only with first method A to H bridges
It is controlled, Sofe Switch i.e. zero voltage switch is difficult to realize as switching tube Q3, Q4 in lagging leg, therefore switching tube Q3,
The switching loss of Q4 is big, causes to overheat.
Similarly, in the course of work of DC-DC converter, if controlled only with second method B H bridges, make
Sofe Switch i.e. zero voltage switch, therefore the switching loss of switching tube Q1, Q2 are difficult to realize for switching tube Q1, Q2 in lagging leg
Greatly, cause to overheat.
Therefore, in an embodiment of the present invention, when being controlled using first method A H bridges, record is using first method
The time that A controls H bridges so as to the available total time TA for controlling H bridges in the first way, is then stored；Using
When second method B controls H bridges, time that record controls H bridges using second method B, so as to available with the
Two modes control the total time TB of H bridges, are then stored.Judge total time TA when DC-DC converter is per task in this way
With the relationship between total time TB, and select what H bridges were controlled according to the relationship between total time TA and total time TB
Mode carries out temperature equalization control so as to realize to first switch pipe, second switch pipe, third switching tube and the 4th switching tube
System.
Wherein, the H bridges are controlled according to the relationship selection between the total time TA and the total time TB
Mode specifically includes：When the total time TA is more than the total time TB, the second method is selected to carry out the H bridges
Control；When the total time TA is less than the total time TB, the first method is selected to control the H bridges；Work as institute
When stating total time TA equal to the total time TB, the first method or the second method is selected to control the H bridges.
That is, before DC-DC converter start-up operation, obtained from storage region and control H bridges in the first way
Total time TA and the total time TB for controlling H bridges in a second manner, then judge total time TA and total time TB, according to sentencing
Disconnected result determines to be controlled H bridges using first method or controlled H bridges using second method.Wherein, DC-DC converter
Mode is chosen during per task and just controls H bridges, DC-DC converter according to fixed form i.e. first method or second method later
Work total time is recorded when being stopped, for example, when DC-DC converter this task is using first method control H bridges, is stopped
The total time obtained when the total time recorded when only working starts for this task from storage region adds this working time, i.e.,
Total time is updated after the every task of DC-DC converter, so as to select which kind of mode during convenient lower task to control H bridges.
It should be noted that in an embodiment of the present invention, H bridges are either controlled in the first way still with second
Mode controls H bridges, and what DC-DC converter used is all the control mode of phase shift modulation.Wherein, first to fourth switching tube is equal
It is driven using 50% duty ratio, the driving voltage of same bridge arm is complementary, phase difference 180 degree, and leading-bridge and lagging leg
Between differ a phase angle, adjust output voltage by adjusting the size at the phase angle.
Specifically, according to one embodiment of present invention, as shown in figure 5, the control method of above-mentioned DC-DC converter
Include the following steps：
S501, work start, i.e., when DC-DC converter starts and starts to work, output control waveform are needed to come in H bridges
Switching tube controlled.
S502 reads total time TA of A controls H bridges in the first way and B controls the total time TB of H bridges in a second manner.
S503, judges whether TA is more than TB.If so, perform step S504；If not, perform step S508.
S504 selects second method B to control H bridges.
S505, DC-DC converter are in the course of work.
S506, judges whether this course of work of DC-DC converter terminates.If so, perform step S507；If
It is no, return to step S505.
S507 records this working time of DC-DC converter, during so as to be started according to DC-DC converter this task
Total time TB obtained from storage region updates total time TB plus this working time.
S508, judges whether TA is less than TB.If so, perform step S509；If not, perform step S513.
S509 selects first method A to control H bridges.
S510, DC-DC converter are in the course of work.
S511, judges whether this course of work of DC-DC converter terminates.If so, perform step S512；If
It is no, return to step S510.
S512 records this working time of DC-DC converter, during so as to be started according to DC-DC converter this task
Total time TA obtained from storage region updates total time TA plus this working time.
S513 selects first method A or second method B to control H bridges.
S514, DC-DC converter are in the course of work.
S515, judges whether this course of work of DC-DC converter terminates.If so, perform step S516；If
It is no, return to step S514.
S516 records this working time of DC-DC converter.Wherein, if selection first method A controls H bridges,
During so as to be started according to DC-DC converter this task from total time TA that storage region obtains plus this working time come more
New total time TA；If selection second method B controls H bridges, so as to when being started according to DC-DC converter this task from depositing
What storage area domain obtained updates total time TB total time TB plus this working time.
In conclusion by recording DC-DC converter per task when is to H bridges using first method or second method
Control, and total time TA when recording using first method and total time TB during using second method, then to TA and TB it
Between relationship judged, so as to select control H bridges mode, can realize H in the whole life cycle of DC-DC converter
The calorific value relative equilibrium of switching tube Q1, Q2, Q3 and Q4 in bridge, need not increase additional component in this way, reduce cost, and
The working life of DC-DC converter can be increased, reduce failure rate.
The control method of DC-DC converter according to embodiments of the present invention when DC-DC converter is worked, obtains
In the first way control H bridges total time TA and in a second manner control H bridges total time TB, then judge total time TA and always
Relationship between time TB, the mode finally controlled according to the relationship selection between total time TA and total time TB H bridges,
To carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube so that each switch
The fever relative equilibrium of pipe in the case where not increasing cost, improves the working life of switching tube in H bridges, so as to extend DC-
The life cycle of DC converters.
As shown in Figure 1, DC-DC converter according to embodiments of the present invention includes H bridges and such as MCU of control module 100
(Micro Control Unit, microcontroller).Wherein, H bridges include first switch pipe Q1, second switch pipe Q2, third switch
Pipe Q3 and the 4th switching tube Q4, first switch pipe Q1 and second switch pipe Q2 form the first bridge arm, third switching tube Q3 and the 4th
Switching tube Q4 forms the second bridge arm, has first node A, third switching tube Q3 between first switch pipe Q1 and second switch pipe Q2
There is second node B between the 4th switching tube Q4.Control module 100 controls the total of the H bridges in the first way for obtaining
The time TA and total time TB for controlling the H bridges in a second manner, and judge between the total time TA and the total time TB
Relationship and according to the side that is controlled the H bridges of relationship selection between the total time TA and the total time TB
Formula, to carry out temperature equalization control to the first switch pipe, second switch pipe, third switching tube and the 4th switching tube, wherein,
When controlling the H bridges with the first method, the control module is using first bridge arm as leading-bridge, and by described the
Two bridge arms are as lagging leg；With the second method control the H bridges when, the control module using second bridge arm as
Leading-bridge, and using first bridge arm as lagging leg.
According to one embodiment of present invention, the control module is according between the total time TA and the total time TB
Relationship selection the H bridges are controlled mode when, wherein, when the total time TA is more than the total time TB, institute
Stating control module selects the second method to control the H bridges；When the total time TA is less than the total time TB,
The control module selects the first method to control the H bridges；When the total time TA is equal to the total time TB
When, the control module selects the first method or the second method to control the H bridges.
That is, in an embodiment of the present invention, control module is controlled such that DC- using first method A to H bridges
When DC converters are worked, record uses the time that first method A controls H bridges, so as to can obtain in the first way
The total time TA of H bridges is controlled, is then stored；Control module is controlled such that H bridges DC-DC becomes using second method B
When parallel operation is worked, record uses the time that second method B controls H bridges, so as to be controlled H in a second manner
The total time TB of bridge, is then stored.Then control module judges the relationship between total time TA and total time TB, last root
According to the mode that is controlled H bridges of relationship selection between total time TA and total time TB, so as to fulfill to first switch pipe, the
Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control.
According to one embodiment of present invention, with the first method control the H bridges when, the control module export to
The control signal of the first switch pipe and the control signal of output to the second switch pipe be complementary and output is to described the
The control signal of three switching tubes and the control signal of output to the 4th switching tube are complementary, and described in the first switch pipe ratio
The super previous phase angle of 4th switching tube is opened and the second switch pipe previous phase angle super than the third switching tube
It is open-minded.
Also, when controlling the H bridges with the second method, the control module is exported to the control of the first switch pipe
Signal processed controls signal complementation and output to the control signal of the third switching tube with output to the second switch pipe
With exporting to the control signal complementation of the 4th switching tube, and the 4th switching tube is super more previous than the first switch pipe
Phase angle is opened and the third switching tube previous phase angle super than the second switch pipe is open-minded.
In an embodiment of the present invention, as shown in Figure 1, first switch pipe Q1, second switch pipe Q2, third switching tube Q3 and
4th switching tube Q4 is IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), when
So, in other embodiments of the invention, first switch pipe Q1, second switch pipe Q2, third switching tube Q3 and the 4th switching tube
Q4 may be metal-oxide-semiconductor.
DC-DC converter according to embodiments of the present invention when being actuated for work, is obtained by control module with first
Mode controls total time TA of H bridges and controls the total time TB of H bridges in a second manner, then judges total time TA and total time TB
Between relationship, finally according to the mode that is controlled H bridges of relationship selection between total time TA and total time TB, with to the
One switching tube, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that the hair of each switching tube
Hot relative equilibrium in the case where not increasing cost, improves the working life of switching tube in H bridges, so as to extend life cycle.
In addition, as shown in fig. 6, the embodiment of the present invention also proposed a kind of electric vehicle 10, including above-mentioned DC-DC
Converter 20.
The electric vehicle of the embodiment of the present invention by above-mentioned DC-DC converter, can be realized and first in H bridges is opened
Guan Guan, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that the fever phase of each switching tube
To balance, in the case where not increasing cost, the working life of switching tube in H bridges is improved, so as to extend DC-DC converter
Life cycle.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of control method of DC-DC converter, which is characterized in that the DC-DC converter includes H bridges, and the H bridges include
First switch pipe, second switch pipe, third switching tube and the 4th switching tube, wherein, the first switch pipe and described second is opened
It closes pipe and forms the first bridge arm, the third switching tube and the 4th switching tube form the second bridge arm, and the control method includes
Following steps：
The total time TA for controlling the H bridges in the first way is obtained, wherein, when controlling the H bridges with the first method, by institute
The first bridge arm is stated as leading-bridge, and using second bridge arm as lagging leg；
The total time TB for controlling the H bridges in a second manner is obtained, wherein, when controlling the H bridges with the second method, by institute
The second bridge arm is stated as leading-bridge, and using first bridge arm as lagging leg；
Judge the relationship between the total time TA and the total time TB；
According to the mode that the relationship selection between the total time TA and the total time TB controls the H bridges, with right
The first switch pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control.
2. the control method of DC-DC converter as described in claim 1, which is characterized in that according to the total time TA and institute
The mode that the selection of the relationship between total time TB controls the H bridges is stated, is specifically included：
When the total time TA is more than the total time TB, the second method is selected to control the H bridges；
When the total time TA is less than the total time TB, the first method is selected to control the H bridges；
When the total time TA is equal to the total time TB, the first method or the second method are selected to the H bridges
It is controlled.
3. the control method of DC-DC converter as claimed in claim 1 or 2, which is characterized in that controlled with the first method
During the H bridges, export control signal to the control signal of the first switch pipe and output to the second switch pipe it is complementary,
And output is complementary and described to the control signal of the third switching tube and the control signal of output to the 4th switching tube
First switch pipe previous phase angle super than the 4th switching tube is opened and the second switch pipe is switched than the third
It is open-minded to manage super previous phase angle.
4. the control method of DC-DC converter as claimed in claim 1 or 2, which is characterized in that controlled with the second method
During the H bridges, export control signal to the control signal of the first switch pipe and output to the second switch pipe it is complementary,
And output is complementary and described to the control signal of the third switching tube and the control signal of output to the 4th switching tube
4th switching tube previous phase angle super than the first switch pipe is opened and the third switching tube is than the second switch
It is open-minded to manage super previous phase angle.
5. a kind of DC-DC converter, which is characterized in that including：
H bridges, the H bridges include first switch pipe, second switch pipe, third switching tube and the 4th switching tube, wherein, described first
Switching tube and the second switch pipe form the first bridge arm, and the third switching tube and the 4th switching tube form the second bridge
Arm；
Control module, the control module control total time TA and in a second manner of the H bridges for obtaining in the first way
The total time TB of the H bridges is controlled, and judges the relationship between the total time TA and the total time TB and according to described
The mode that relationship selection between total time TA and the total time TB controls the H bridges, with to the first switch
Pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, wherein,
When controlling the H bridges with the first method, the control module is using first bridge arm as leading-bridge, and by institute
The second bridge arm is stated as lagging leg；
When controlling the H bridges with the second method, the control module is using second bridge arm as leading-bridge, and by institute
The first bridge arm is stated as lagging leg.
6. DC-DC converter as claimed in claim 5, which is characterized in that the control module according to the total time TA with
During the mode that the relationship selection between the total time TB controls the H bridges, wherein,
When the total time TA is more than the total time TB, the control module select the second method to the H bridges into
Row control；
When the total time TA is less than the total time TB, the control module select the first method to the H bridges into
Row control；
When the total time TA is equal to the total time TB, the control module selects the first method or the second party
Formula controls the H bridges.
7. such as DC-DC converter described in claim 5 or 6, which is characterized in that when controlling the H bridges with the first method,
The control module exports mutual to the control signal of the first switch pipe and the control signal of output to the second switch pipe
Mending and export to the third switching tube controls signal and the control signal of output to the 4th switching tube complementary, and
The first switch pipe previous phase angle super than the 4th switching tube is opened and the second switch pipe is than the third
The super previous phase angle of switching tube is open-minded.
8. such as DC-DC converter described in claim 5 or 6, which is characterized in that when controlling the H bridges with the second method,
The control module exports mutual to the control signal of the first switch pipe and the control signal of output to the second switch pipe
Mending and export to the third switching tube controls signal and the control signal of output to the 4th switching tube complementary, and
The 4th switching tube previous phase angle super than the first switch pipe is opened and the third switching tube is than described second
The super previous phase angle of switching tube is open-minded.
9. the DC-DC converter as described in any one of claim 5-8, which is characterized in that the first switch pipe, second open
Guan Guan, third switching tube and the 4th switching tube are IGBT or metal-oxide-semiconductor.
10. a kind of electric vehicle, which is characterized in that including the DC-DC converter as described in any one of claim 5-9.
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