CN108155793A - 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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- CN108155793A CN108155793A CN201611099638.0A CN201611099638A CN108155793A CN 108155793 A CN108155793 A CN 108155793A CN 201611099638 A CN201611099638 A CN 201611099638A CN 108155793 A CN108155793 A CN 108155793A
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- bridges
- switching tube
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- switch pipe
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the control method of a kind of electric vehicle and its DC DC converters and DC DC converters, 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：When DC DC converters are worked every time, it obtains with the setting time Ti of the Third Way control H bridges and setting time Tm with fourth way control H bridges, when controlling H bridges with Third Way, using first switch pipe and third switching tube as upper tube and using second switch pipe and the 4th switching tube as down tube；When controlling H bridges with fourth way, using first switch pipe and third switching tube as down tube and using second switch pipe and the 4th switching tube as upper tube；H bridges are carried out alternately to control to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube according to Ti and Tm, so that the fever relative equilibrium of first to fourth switching tube, improve the working life of switching tube.
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, described
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, institute
Control method is stated to include the following steps：When the DC-DC converter is worked every time, obtain described in being controlled with Third Way
The setting time Ti of the H bridges and setting time Tm that the H bridges are controlled with fourth way, wherein, institute is controlled with the Third Way
When stating H bridges, using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and described
Four switching tubes carry out the first switch pipe to the 4th switching tube as down tube, and using the control mode of down tube modulation
Control；When controlling the H bridges with the fourth way, using the first switch pipe and the third switching tube as down tube and
Using the second switch pipe and the 4th switching tube as upper tube, and opened using the control mode of down tube modulation described first
The 4th switching tube is controlled described in Guan Guanzhi；The H bridges are carried out according to the setting time Ti and setting time Tm
Alternately control is with to the progress temperature equalization control of the first switch pipe, second switch pipe, third switching tube and the 4th switching tube.
The control method of DC-DC converter according to embodiments of the present invention, when DC-DC converter is worked every time,
Obtain with the setting time Ti of the Third Way control H bridges and setting time Tm with fourth way control H bridges, then according to Ti and
Tm carries out H bridges alternately to control with equal into trip temperature to first switch pipe, second switch pipe, third switching tube and the 4th switching tube
Weighing apparatus control so that the fever relative equilibrium of each switching tube in the case where not increasing cost, improves the work of switching tube in H bridges
Make the service life, so as to extend the life cycle of DC-DC converter.
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；Control module, the control module are used
The setting time Ti of the H bridges is controlled and with the with Third Way in being obtained when the DC-DC converter is worked every time
Four modes control the setting time Tm of the H bridges, and according to the setting time Ti and setting time Tm to the H bridges into
Row alternately controls to carry out temperature equalization control to the first switch pipe, second switch pipe, third switching tube and the 4th switching tube
System, wherein, when controlling the H bridges with the Third Way, the control module opens the first switch pipe and the third
Pipe is closed as upper tube and using the second switch pipe and the 4th switching tube as down tube, and using the control of down tube modulation
Mode controls the first switch pipe to the 4th switching tube；It is described when controlling the H bridges with the fourth way
Control module is using the first switch pipe and the third switching tube as down tube and by the second switch pipe and described
Four switching tubes carry out the first switch pipe to the 4th switching tube as upper tube, and using the control mode of down tube modulation
Control.
DC-DC converter according to embodiments of the present invention when being worked every time, is obtained by control module with third
Mode control H bridges setting time Ti and with fourth way control H bridges setting time Tm, then according to Ti and Tm to H bridges into
Alternately control to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube, makes row
The fever relative equilibrium of each switching tube is obtained, in the case where not increasing cost, improves the working life of switching tube in H bridges, from
And 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 when above-mentioned DC-DC converter is per task, can be realized in H bridges
First switch pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that each switching tube
Fever relative equilibrium, in the case where not increasing cost, improve H bridges in switching tube working life, so as to extend DC-DC
The life cycle of converter.
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 Third Way the H bridges switching tube according to one embodiment of the invention
Drive waveforms schematic diagram；
Fig. 4 is four when being controlled using fourth way 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
Between have first node A, between third switching tube Q3 and the 4th switching tube Q4 have second node B.
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 every time, obtain with Third Way control H bridges setting time Ti and with
Fourth way controls the setting time Tm of H bridges.
Wherein, when controlling the H bridges with the Third Way, using the first switch pipe and the third switching tube as
Upper tube and using the second switch pipe and the 4th switching tube as down tube, and using down tube modulation control mode to institute
First switch pipe to the 4th switching tube is stated to be controlled；When controlling the H bridges with the fourth way, described first is opened
Third switching tube described in Guan Guanhe is adopted as down tube and using the second switch pipe and the 4th switching tube as upper tube
The control mode modulated with down tube controls the first switch pipe to the 4th switching tube.
According to one embodiment of present invention, it when controlling the H bridges with the Third Way, exports to first switch pipe Q1
Control signal and output to third switching tube Q3 control signal it is complementary and be fixed duty cycle, and to output to second switch
The failing edge of the control signal of pipe Q2 and the 4th switching tube Q4 carries out PWM controls.
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, Q3 are complementary in four switching tubes of H bridges and are to fix 50% duty ratio, the failing edge of Q2, Q4
It is modulated by PWM rules, and is to adjust output voltage by adjusting the driving voltage failing edge of down tube.
Also, when controlling the H bridges with the fourth way, export to the control signal of second switch pipe Q2 with exporting extremely
The control signal of 4th switching tube Q4 is complementary and is fixed duty cycle, and to output to first switch pipe Q1 and third switching tube Q3
Control signal failing edge carry out PWM controls.
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 Q2, Q4 are complementary in four switching tubes of H bridges and are to fix 50% duty ratio, the failing edge of Q1, Q3
It is modulated by PWM rules, and is to adjust output voltage by adjusting the driving voltage failing edge of down tube.
S2 carries out H bridges alternately to control with to first switch pipe, second switch according to setting time Ti and setting time Tm
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 Third Way C to H bridges
It is controlled, since the resonant discharge stage can only utilize primary side resonant inductance, switching tube Q2, Q4 as down tube are difficult
Realize Sofe Switch, that is, zero voltage switch, it is big so as to the switching loss of switching tube Q2, Q4, cause to overheat.
Similarly, in the course of work of DC-DC converter, if controlled only with fourth way D H bridges, by
Primary side resonant inductance can only be utilized, therefore switching tube Q1, Q3 as down tube are difficult to realize Sofe Switch in the resonant discharge stage
That is zero voltage switch, it is big so as to the switching loss of switching tube Q1, Q3, cause to overheat.
Therefore, in an embodiment of the present invention, when DC-DC converter is per task, Ti and Tm is first set, then in DC-
In the course of work of DC converters, can DC-DC converter, which works, first be controlled such that H bridges using Third Way C, directly
Reach Ti to using the time that Third Way C controls H bridges, be switched to and H bridges are controlled such that using fourth way D
DC-DC converter works, until reaching Tm using the time that fourth way D controls H bridges, so completes a work
(i.e. a net cycle time=Ti+Tm) is recycled, then is switched to and DC-DC is controlled such that H bridges using Third Way C
Converter works, until reaching Ti using the time that Third Way C controls H bridges, then switches to using the 4th
Mode D is controlled such that DC-DC converter works to H bridges, until using fourth way D to H bridges controlled when
Between reach Tm ... ..., be so repeated, realize to H bridges carry out alternately control, opened so as to fulfill to first switch pipe, second
Guan Guan, third switching tube and the 4th switching tube carry out temperature equalization control.Certainly, in the course of work of DC-DC converter,
Can DC-DC converter, which works, first be controlled such that H bridges using fourth way D, until using fourth way D to H bridges
The time controlled reaches Tm, is switched to and is controlled such that DC-DC converter works to H bridges using Third Way C,
Until reaching Ti using the time that Third Way C controls H bridges, a working cycles are so completed, and according to such
Working cycles are repeated, until DC-DC converter stops this task.
In other words, alternately control, packet carry out the H bridges according to setting time Ti and setting time Tm in above-mentioned steps S2
It includes：When the time of the H bridges being controlled to reach Ti using the Third Way, the H bridges are carried out using the fourth way
Control, until reaching Tm using the time of the fourth way control H bridges；Or when using fourth way control institute
When stating time of H bridges and reaching Tm, the H bridges are controlled using the Third Way, until using the Third Way control
The time for making the H bridges reaches Ti.
It should be noted that in an embodiment of the present invention, H bridges are either controlled still with the 4th with Third Way
Mode controls H bridges, and what DC-DC converter used is all the control mode of down tube modulation.Wherein, the control modulated using down tube
During mode, two switching tubes of upper tube are open-minded in turn by 50% duty ratio, there is no dead time, by adjust down tube two
The failing edge of a switching tube driving voltage, realizes the adjusting of output voltage.
Also, in the control mode of down tube modulation, two switching tubes Sofe Switch, that is, no-voltage easy to implement of upper tube is opened
It closes, corresponding to the leading-bridge in the control mode of phase shift modulation, and two switching tubes of down tube correspond to the control of phase shift modulation
Lagging leg in mode processed is difficult to realize zero voltage switch.
In the embodiment of the present invention, DC-DC converter starts in the course of work in whole life cycle, by by first
To the 4th switching tube alternately as top tube and down tube, that is, Q1, Q3 and Q2, Q4 alternate plays upper tube, down tube, make temperature stress in H bridges four
It is equivalent in a switching tube to be uniformly distributed, so that the fever relative equilibrium of each switching tube, realizes whole thermal balance, extend
The service life of DC-DC converter.
According to one embodiment of present invention, the setting time Ti controlled with the Third Way the H bridges can
Equal to the setting time Tm controlled with the fourth way the H bridges, can ensure with Third Way and the 4th in this way
Mode ensures first switch pipe Q1, second switch pipe Q2, third switching tube Q3 and the 4th switching tube Q4 fevers when alternately controlling H bridges
Relative equilibrium.
It is, of course, understood that in other embodiments of the invention, the H bridges are carried out with the Third Way
Setting time Ti of control can not also be equal with the setting time Tm controlled with the fourth way the H bridges.
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 sets Ti and Tm.
S503 is controlled such that DC-DC converter works using Third Way C to H bridges, and is converted in DC-DC
Judge whether this task of DC-DC converter terminates in the course of work of device, if so, terminating flow, continue if not, returning
Judge.
S504 judges whether the time using Third Way C control H bridges reaches Ti.If so, perform step S505；Such as
Fruit is no, return to step S503.
S505 is controlled such that DC-DC converter works using fourth way D to H bridges, and is converted in DC-DC
Judge whether this task of DC-DC converter terminates in the course of work of device, if so, terminating flow, continue if not, returning
Judge.
S506 judges whether the time using fourth way D control H bridges reaches Tm.Step is performed if so, returning
S503；If not, return to step S505.
In conclusion the control method of the DC-DC converter of the embodiment of the present invention can make DC-DC converter per task
Ensure first switch pipe, second switch pipe, third switching tube and the 4th switching tube fever relative equilibrium in the process, without increasing volume
Outer component reduces cost, and improves the working life of DC-DC converter.
The control method of DC-DC converter according to embodiments of the present invention, when DC-DC converter is worked every time,
Obtain with the setting time Ti of the Third Way control H bridges and setting time Tm with fourth way control H bridges, then according to Ti and
Tm carries out H bridges alternately to control with equal into trip temperature to first switch pipe, second switch pipe, third switching tube and the 4th switching tube
Weighing apparatus control so that the fever relative equilibrium of each switching tube in the case where not increasing cost, improves the work of switching tube in H bridges
Make the service life, so as to extend the life cycle of DC-DC converter.
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
Between pipe Q3 and the 4th switching tube Q4, first switch pipe Q1 and second switch pipe Q2 have first node A, third switching tube Q3 with
There is second node B between 4th switching tube Q4.Control module 100 is used for when the DC-DC converter is worked every time
Obtain the setting time Tm that the setting time Ti of the H bridges is controlled with Third Way and the H bridges are controlled with fourth way, and root
The H bridges are carried out alternately to control with to the first switch pipe, second according to the setting time Ti and the setting time Tm
Switching tube, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, the H bridges are controlled with the Third Way
When, the control module using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and
4th switching tube switchs the first switch pipe to the described 4th as down tube, and using the control mode of down tube modulation
Pipe is controlled；When controlling the H bridges with the fourth way, the control module is by the first switch pipe and the third
Switching tube is as down tube and using the second switch pipe and the 4th switching tube as upper tube, and the control modulated using down tube
Mode processed controls the first switch pipe to the 4th switching tube.
According to one embodiment of present invention, the control module according to setting time Ti and sets time Tm to the H
When bridge alternately control, wherein, when the time of the H bridges being controlled to reach Ti using the Third Way, the control mould
Block controls the H bridges using the fourth way, until the time for controlling the H bridges using the fourth way reaches
Tm；Or when the time of the H bridges being controlled to reach Tm using the fourth way, the control module uses the third party
Formula controls the H bridges, until the time for controlling the H bridges using the Third Way reaches Ti.
That is, in an embodiment of the present invention, when DC-DC converter is per task, control module first set Ti and
Tm then in the course of work of DC-DC converter, can first be controlled such that H bridges using Third Way C that DC-DC is converted
Device works, until reaching Ti using the time that Third Way C controls H bridges, is switched to using fourth way D to H
Bridge is controlled such that DC-DC converter works, until Tm is reached using the time that fourth way D controls H bridges,
So complete a working cycles (i.e. a net cycle time=Ti+Tm), then be switched to using Third Way C to H bridges into
Row controls so that DC-DC converter works, until reaching Ti using the time that Third Way C controls H bridges, then
It is switched to and DC-DC converter, which works, to be controlled such that H bridges using fourth way D, until using fourth way D to H
The time that bridge is controlled reaches Tm ... ..., is so repeated, and realizes and alternately control is carried out to H bridges, so as to fulfill to first
Switching tube, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control.Certainly, in DC-DC converter
In the course of work, control module also first can be controlled such that DC-DC converter works using fourth way D to H bridges, directly
Reach Tm to using the time that fourth way D controls H bridges, be switched to and H bridges are controlled such that using Third Way C
DC-DC converter works, until reaching Ti using the time that Third Way C controls H bridges, so completes a work
It recycles, and is repeated according to such working cycles, until DC-DC converter stops this task.
Wherein, in a preferred embodiment of the invention, the setting controlled with the Third Way the H bridges
Time Ti can be equal to the setting time Tm controlled with the fourth way the H bridges.It can ensure with third party in this way
Formula and fourth way ensure first switch pipe Q1, second switch pipe Q2, the switches of third switching tube Q3 and the 4th when alternately controlling H bridges
Pipe Q4 fever relative equilibriums.
It is, of course, understood that in other embodiments of the invention, the H bridges are carried out with the Third Way
Setting time Ti of control can not also be equal with the setting time Tm controlled with the fourth way the H bridges.
According to one embodiment of present invention, with the Third Way control the H bridges when, the control module export to
The control signal of the first switch pipe is complementary with the control signal of output to the third switching tube and is fixed duty cycle, and
PWM controls are carried out to the failing edge for exporting the control signal to the second switch pipe and the 4th switching tube.
Also, when controlling the H bridges with the fourth way, the control module is exported to the control of the second switch pipe
Signal processed is with exporting to the control signal complementation of the 4th switching tube and being fixed duty cycle, and output to described first is opened
The failing edge of the control signal of third switching tube described in Guan Guanhe carries out PWM controls.
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 worked every time, is obtained by control module with third
Mode control H bridges setting time Ti and with fourth way control H bridges setting time Tm, then according to Ti and Tm to H bridges into
Alternately control to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube, makes row
The fever relative equilibrium of each switching tube is obtained, in the case where not increasing cost, improves the working life of switching tube in H bridges, from
And 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 when above-mentioned DC-DC converter is per task, can be realized in H bridges
First switch pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control so that each switching tube
Fever relative equilibrium, in the case where not increasing cost, improve H bridges in switching tube working life, so as to extend DC-DC
The life cycle of converter.
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 (11)
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, the control method include the following steps：
When the DC-DC converter is worked every time, obtain with Third Way control the H bridges setting time Ti and with
Fourth way controls the setting time Tm of the H bridges, wherein, when controlling the H bridges with the Third Way, described first is opened
Third switching tube described in Guan Guanhe is adopted as upper tube and using the second switch pipe and the 4th switching tube as down tube
The control mode modulated with down tube controls the first switch pipe to the 4th switching tube；With the fourth way control
When making the H bridges, using the first switch pipe and the third switching tube as down tube and by the second switch pipe and institute
The 4th switching tube is stated as upper tube, and the control mode modulated using down tube is to the first switch pipe to the 4th switching tube
It is controlled；
The H bridges are carried out alternately to control with to the first switch according to the setting time Ti and the setting time Tm
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 it is described setting time Ti and
The setting time Tm carries out the H bridges alternately control, specifically includes：
When the time of the H bridges being controlled to reach Ti using the Third Way, the H bridges are carried out using the fourth way
Control, until reaching Tm using the time of the fourth way control H bridges；Or
When the time of the H bridges being controlled to reach Tm using the fourth way, the H bridges are carried out using the Third Way
Control, until reaching Ti using the time of the Third Way control H bridges.
3. the control method of DC-DC converter as claimed in claim 1 or 2, which is characterized in that controlled with the Third Way
During the H bridges, export complementary to the control signal of the first switch pipe and the control signal of output to the third switching tube
And it is fixed duty cycle, and the failing edge for exporting the control signal to the second switch pipe and the 4th switching tube is carried out
PWM is controlled.
4. the control method of DC-DC converter as claimed in claim 1 or 2, which is characterized in that controlled with the fourth way
During the H bridges, export complementary to the control signal of the second switch pipe and the control signal of output to the 4th switching tube
And it is fixed duty cycle, and the failing edge for exporting the control signal to the first switch pipe and the third switching tube is carried out
PWM is controlled.
5. the control method of DC-DC converter as described in claim 1, which is characterized in that with the Third Way to the H
Setting time Ti that bridge is controlled is equal to the setting time Tm controlled with the fourth way the H bridges.
6. 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；
Control module, the control module are used to obtain with Third Way control when the DC-DC converter is worked every time
It makes the setting time Ti of the H bridges and the setting time Tm of the H bridges is controlled with fourth way, and according to the setting time Ti
The H bridges are carried out alternately to control with to the first switch pipe, second switch pipe, third switching tube with the setting time Tm
Temperature equalization control is carried out with the 4th switching tube, wherein,
When controlling the H bridges with the Third Way, the control module is by the first switch pipe and the third switching tube
As upper tube and using the second switch pipe and the 4th switching tube as down tube, and using the control mode of down tube modulation
The first switch pipe to the 4th switching tube is controlled；
When controlling the H bridges with the fourth way, the control module is by the first switch pipe and the third switching tube
As down tube and using the second switch pipe and the 4th switching tube as upper tube, and using the control mode of down tube modulation
The first switch pipe to the 4th switching tube is controlled.
7. DC-DC converter as claimed in claim 6, which is characterized in that the control module is according to the setting time Ti
When to the H bridges alternately control with the setting time Tm, wherein,
When the time of the H bridges being controlled to reach Ti using the Third Way, the control module uses the fourth way
The H bridges are controlled, until the time for controlling the H bridges using the fourth way reaches Tm；Or
When the time of the H bridges being controlled to reach Tm using the fourth way, the control module uses the Third Way
The H bridges are controlled, until the time for controlling the H bridges using the Third Way reaches Ti.
8. DC-DC converter as claimed in claims 6 or 7, which is characterized in that when controlling the H bridges with the Third Way,
The control module exports mutual to the control signal of the first switch pipe and the control signal of output to the third switching tube
Mend and for fixed duty cycle, and to export the failing edge of the control signal to the second switch pipe and the 4th switching tube into
Row PWM is controlled.
9. DC-DC converter as claimed in claims 6 or 7, which is characterized in that when controlling the H bridges with the fourth way,
The control module exports mutual to the control signal of the second switch pipe and the control signal of output to the 4th switching tube
Mend and for fixed duty cycle, and to export the failing edge of the control signal to the first switch pipe and the third switching tube into
Row PWM is controlled.
10. DC-DC converter as claimed in claim 6, which is characterized in that controlled with the Third Way to the H bridges
Setting time Ti of system is equal to the setting time Tm controlled with the fourth way the H bridges.
11. a kind of electric vehicle, which is characterized in that including the DC-DC converter as described in any one of claim 6-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611099638.0A CN108155793A (en) | 2016-12-02 | 2016-12-02 | The control method of electric vehicle and its DC-DC converter and DC-DC converter |
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| CN201611099638.0A CN108155793A (en) | 2016-12-02 | 2016-12-02 | The control method of electric vehicle and its DC-DC converter and DC-DC converter |
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| CN108155793A true CN108155793A (en) | 2018-06-12 |
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| CN201611099638.0A Pending CN108155793A (en) | 2016-12-02 | 2016-12-02 | The control method of electric vehicle and its DC-DC converter and DC-DC converter |
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Application publication date: 20180612 |