CN108155795A - 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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- CN108155795A CN108155795A CN201611099657.3A CN201611099657A CN108155795A CN 108155795 A CN108155795 A CN 108155795A CN 201611099657 A CN201611099657 A CN 201611099657A CN 108155795 A CN108155795 A CN 108155795A
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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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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：In the whole life cycle of DC DC converters, using phase shift modulation control mode and down tube modulate control mode alternately, using phase shift modulation control mode when based on total time TA and total time TB come select in the first way or second method control H bridges, and it is selected in the control mode for using down tube modulation based on total time TC and total time TD with Third Way or fourth way control H bridges, with to first switch pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, so that the fever relative equilibrium of first to fourth switching tube in H bridges, improve the working life of switching tube in H bridges.
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：When the DC-DC converter is worked, obtain
Control mode during DC-DC converter last time work, and control when being worked according to the DC-DC converter last time
Mode selects control mode during this task, wherein, the control mode of the DC-DC converter includes the control of phase shift modulation
Mode and the control mode of down tube modulation；Control mode of the control mode for the phase shift modulation when selecting this work
When, acquisition controls total time TA of the H bridges and controls the total time TB of the H bridges in a second manner, and lead in the first way
It crosses and judges relationship between the total time TA and the total time TB in a manner of selecting to control 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, wherein, with described
When first method controls the H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lag bridge
Arm；When controlling the H bridges with the second method, using second bridge arm as leading-bridge, and first bridge arm is made
For lagging leg；During the control mode that the control mode when selecting this work is modulated for the down tube, obtain with third party
Formula is controlled total time TC of the H bridges and the total time TD of the H bridges is controlled with fourth way, and pass through and judge the total time
Relationship between TC and the total time TD is in a manner of selecting to control the H bridges, with to the first switch pipe,
Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, the H is controlled with the Third Way
During bridge, opened using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and the described 4th
Pipe is closed as down tube, and the first switch pipe to the 4th switching tube is controlled using the control mode of down tube modulation
System；When controlling the H bridges with the fourth way, the first switch pipe and the third switching tube as down tube and are incited somebody to action
The second switch pipe and the 4th switching tube are as upper tube, and the control mode modulated using down tube is to the first switch
Pipe to the 4th switching tube is controlled.
The control method of DC-DC converter according to embodiments of the present invention when DC-DC converter is worked, obtains
Control mode when the DC-DC converter last time works, and control mode when work according to the DC-DC converter last time selects
Control mode during this task so that the control mode of phase shift modulation and down tube tune in DC-DC converter whole life cycle
The control mode of system is alternately.Wherein, it during control mode of the control mode when selecting this work for phase shift modulation, obtains
Take 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
Relationship between total time TB, the side finally controlled according to the relationship selection between total time TA and total time TB H bridges
Formula, to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube；When selection sheet
During control mode for down tube modulation of control mode during task, obtain with total time TC of Third Way control H bridges and with
Fourth way controls the total time TD of H bridges, the relationship between total time TC and total time TD is then judged, finally according to total time
The mode that relationship selection between TC and total time TD controls H bridges, with to first switch pipe, second switch pipe, third
Switching tube and the 4th switching tube carry out temperature equalization control, so as to which in whole life cycle, DC-DC converter uses phase shift tune
Total time TA and total time TB during the control mode of system is equal as possible, and DC-DC converter uses the control mode of down tube modulation
When total time TC and total time TD it is equal as possible so that the fever relative equilibrium of each switching tube, in the feelings for not increasing cost
Under condition, the working life of switching tube in H bridges is improved, 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, 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 is used to obtain when the DC-DC converter is worked when once working in the DC-DC converter
Control mode, and control mode when control mode when being worked according to the DC-DC converter last time selects this task,
The control mode of the DC-DC converter includes the control mode of phase shift modulation and the control mode of down tube modulation, wherein, it is elected to
When control mode when selecting this task is the control mode of the phase shift modulation, the control module acquisition is controlled in the first way
Make total time TA of the H bridges and control the total time TB of the H bridges in a second manner, and pass through judge the total time TA with
Relationship between the total time TB is in a manner of selecting to control the H bridges, to open the first switch pipe, second
Guan Guan, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, when controlling the H bridges with the first method,
Using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；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 this work of selection
During the control mode that control mode when making is modulated for the down tube, the control module is obtained controls the H with Third Way
Total time TC of bridge and the total time TD that the H bridges are controlled with fourth way, and pass through judge the total time TC with it is described total
Relationship between time TD in a manner of selecting to control 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 Third Way, by institute
State 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 the first switch pipe to the 4th switching tube is controlled using the control mode of down tube modulation；With described
When fourth way controls the H bridges, using the first switch pipe and the third switching tube as down tube and by described second
Switching tube and the 4th switching tube as upper tube, and using down tube modulation control mode to the first switch pipe to described
4th switching tube is controlled.
When being actuated for work, DC-DC is obtained DC-DC converter according to embodiments of the present invention by control module
Control mode when the converter last time works, and control mode when being worked according to the DC-DC converter last time selects this
Control mode during work so that the control mode of phase shift modulation and down tube are modulated in DC-DC converter whole life cycle
Control mode is alternately.Wherein, during control mode of the control mode when selecting this work for phase shift modulation, pass through control
Molding block obtains total time TA of control H bridges in the first way and controls the total time TB of H bridges in a second manner, then judges total
Relationship between time TA and total time TB finally carries out H bridges according to the relationship selection between total time TA and total time TB
The mode of control, to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube；
During the control mode that the control mode when selecting this work is modulated for down tube, obtained by control module with Third Way control
Total time TC of H bridges processed and the total time TD with fourth way control H bridges, then judged between total time TC and total time TD
Relationship, the mode finally controlled according to the relationship selection between total time TC and total time TD H bridges, with to first switch
Pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, so as in whole life cycle, adopt
Total time TA and total time TB during with the control mode of phase shift modulation is equal as possible, during the control mode modulated using down tube
Total time TC and total time TD are equal as possible so that the fever relative equilibrium of each switching tube, in the case where not increasing cost,
The working life of switching tube in H bridges is improved, 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 can control DC-DC converter to use phase shift tune in whole life cycle
System control mode and down tube modulation control mode alternately, and using phase shift modulation control mode when total time
TA and total time TB are equal as possible, using down tube modulate control mode when total time TC and total time TD it is equal as possible, energy
Enough realize carries out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube in H bridges,
So that the fever relative equilibrium of each switching tube, in the case where not increasing cost, improves the working life of switching tube in H bridges,
So as to extend the life cycle of DC-DC 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 A are four when being controlled using first method the H bridges switching tube according to one embodiment of the invention
Drive waveforms schematic diagram；
Fig. 3 B are four when being controlled using second method the H bridges switching tube according to one embodiment of the invention
Drive waveforms schematic diagram；
Fig. 4 A are 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 B are 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
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 control mode during work of DC-DC converter last time, and root
Control mode when working according to the DC-DC converter last time selects control mode during this task, wherein, DC-DC converter
The control mode of control mode including phase shift modulation and the control mode of down tube modulation.
In other words, DC-DC converter starts per task, reads control mode used by the last time, if last work
Control mode is the control mode of phase shift modulation used by work, then this task of DC-DC converter will be using down tube modulation
Control mode；If last time work used by control mode be down tube modulation control mode, DC-DC converter this
Work will be using the control mode of phase shift modulation.In this way, in the whole life cycle of DC-DC converter, the control of phase shift modulation
The control mode of mode and down tube modulation processed is alternately.
S2, during control mode for phase shift modulation of control mode when selecting this work, acquisition is controlled in the first way
Total time TA of H bridges processed and the total time TB for controlling H bridges in a second manner, and pass through and judge between total time TA and total time TB
Relationship in a manner of selecting to control H bridges, to open first switch pipe, second switch pipe, third switching tube and the 4th
It closes pipe and carries out temperature equalization control.
Wherein, when controlling the H bridges with the first method, using first bridge arm as leading-bridge, and by described in
Second bridge arm is as lagging leg；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 3A.From figure
3A can show that the control signal of Q1, Q2 are complementary in four switching tubes of H bridges, and the control signal of Q3, Q4 are complementary, and diagonal is opened
Pass pipe Q1 previous phase angles super than Q4 are open-minded, and Q2 is super than Q3, and previous phase angle is open-minded.Also, by adjusting the phase angle
Size adjusts 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 3B.From figure
4 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.
Wherein, it should be noted that in the course of work that DC-DC converter is carried out using the control mode of phase shift modulation
In, if controlled only with first method A H bridges, Sofe Switch is difficult to realize as switching tube Q3, Q4 in lagging leg
That is zero voltage switch, therefore the switching loss of switching tube Q3, Q4 are big, cause to overheat.
Similarly, in the course of work carried out in DC-DC converter using the control mode of phase shift modulation, if only with
Second method B controls H bridges, and Sofe Switch i.e. zero voltage switch is difficult to realize as switching tube Q1, Q2 in lagging leg,
Therefore the switching loss of switching tube Q1, Q2 are big, cause to overheat.
Therefore, in one embodiment of the invention, DC-DC converter is worked using the control mode of phase shift modulation
When, when being controlled using first method A H bridges, record uses the time that first method A controls H bridges, so as to
To the total time TA for controlling H bridges in the first way, then stored；When being controlled using second method B H bridges, record
The time controlled using second method B H bridges, so as to the available total time TB, Ran Houjin for controlling H bridges in a second manner
Row storage.Judge in this way when DC-DC converter is worked every time using the control mode of phase shift modulation total time TA with always
Relationship between time TB, and the mode controlled H bridges is selected according to the relationship between total time TA and total time TB,
Temperature equalization control is carried out to first switch pipe, second switch pipe, third switching tube and the 4th switching tube so as to realize.
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 is started to work using the control mode of phase shift modulation, obtained from storage region
It takes total time TA of control H bridges in the first way and controls the total time TB of H bridges in a second manner, then to total time TA and always
Time, TB was judged, determined to be controlled H bridges using first method or controlled using second method according to judging result
H bridges processed.Wherein, DC-DC converter chooses mode later just during being worked using the control mode of phase shift modulation
According to fixed form, that is, first method or second method control H bridges, work total time is recorded when DC-DC converter is stopped,
For example, when DC-DC converter this task is using first method control H bridges, the total time recorded when being stopped is this
It, i.e., will after the every task of DC-DC converter from the total time that storage region obtains plus this working time when task starts
Total time is updated, 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.
In conclusion when DC-DC converter is worked using the control mode of phase shift modulation, by recording DC-DC
Converter is that H bridges are controlled using first method or second method, and total time TA when recording using first method and is adopted
Total time TB during with second method, then the relationship between TA and TB judge, so as to select control H bridges mode,
The fever of switching tube Q1, Q2, Q3 and Q4 in H bridges can be realized in control mode of the DC-DC converter using phase shift modulation
Relative equilibrium is measured, additional component need not be increased in this way, reduce cost, and the working life of DC-DC converter can be increased,
Reduce failure rate.
S3 during the control mode that the control mode when selecting this work is modulated for down tube, is obtained with Third Way control
Total time TC of H bridges processed and the total time TD with fourth way control H bridges, and pass through and judge between total time TC and total time TD
Relationship in a manner of selecting to control H bridges, to open first switch pipe, second switch pipe, third switching tube and the 4th
It closes pipe and carries out temperature equalization control.
Wherein, when controlling the H bridges with the Third Way, using first switch pipe Q1 and third switching tube Q3 as upper tube
And using second switch pipe Q2 and the 4th switching tube Q4 as down tube, and the control mode modulated using down tube is to first switch pipe
It is controlled to the 4th switching tube；When controlling the H bridges with the fourth way, by first switch pipe Q1 and third switching tube Q3
As down tube and using second switch pipe Q2 and the 4th switching tube Q4 as upper tube, and using down tube modulation control mode to the
One switching tube to the 4th switching tube is controlled.
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 4 A.From figure
4A can show that the control signal of Q1, Q3 are complementary in four switching tubes of H bridges and are to fix 50% duty ratio, the decline of Q2, Q4
Edge is modulated, and be to adjust output voltage by adjusting the driving voltage failing edge of down tube by PWM rules.
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 B.From figure
4B can show that the control signal of Q2, Q4 are complementary in four switching tubes of H bridges and are to fix 50% duty ratio, the decline of Q1, Q3
Edge is modulated, and be to adjust output voltage by adjusting the driving voltage failing edge of down tube by PWM rules.
Wherein, it should be noted that in the course of work that DC-DC converter is carried out using the control mode of down tube modulation
In, if controlled only with Third Way C H bridges, since the resonant discharge stage can only utilize primary side resonant inductance, because
This is difficult to realize Sofe Switch i.e. zero voltage switch as switching tube Q2, Q4 of down tube, so as to the switching loss of switching tube Q2, Q4
Greatly, cause to overheat.
Similarly, in the course of work carried out in DC-DC converter using the control mode of down tube modulation, if only with
Fourth way D controls H bridges, since the resonant discharge stage can only utilize primary side resonant inductance, as down tube
Switching tube Q1, Q3 are difficult to realize Sofe Switch i.e. zero voltage switch, big so as to the switching loss of switching tube Q1, Q3, cause to overheat.
Therefore, in one embodiment of the invention, DC-DC converter is worked using the control mode of down tube modulation
When, when being controlled using Third Way C H bridges, record uses the time that Third Way C controls H bridges, so as to
To with the total time TC of Third Way control H bridges, then stored；When being controlled using fourth way D H bridges, record
The time controlled using fourth way D H bridges, so as to available total time TD, Ran Houjin with fourth way control H bridges
Row storage.In this way DC-DC converter every time using down tube modulation control mode worked when judge total time TC with always
Relationship between time TD, and the mode controlled H bridges is selected according to the relationship between total time TC and total time TD,
Temperature equalization control is carried out to first switch pipe, second switch pipe, third switching tube and the 4th switching tube so as to realize.
Wherein, the H bridges are controlled according to the relationship selection between the total time TC and the total time TD
Mode specifically includes：When the total time TC is more than the total time TD, the fourth way is selected to carry out the H bridges
Control；When the total time TC is less than the total time TD, the Third Way is selected to control the H bridges；Work as institute
When stating total time TC equal to the total time TD, the Third Way or the fourth way is selected to control the H bridges.
That is, before DC-DC converter is started to work using the control mode of down tube modulation, obtained from storage region
It takes with total time TC of Third Way control H bridges and the total time TD with fourth way control H bridges, then to total time TC and always
Time, TD was judged, determined to be controlled H bridges using Third Way or controlled using fourth way according to judging result
H bridges processed.Wherein, DC-DC converter chooses mode later just during being worked using the control mode of down tube modulation
According to fixed form, that is, Third Way or fourth way control H bridges, work total time is recorded when DC-DC converter is stopped,
For example, when DC-DC converter this task is using Third Way control H bridges, the total time recorded when being stopped is this
It, i.e., will after the every task of DC-DC converter from the total time that storage region obtains plus this working time when task starts
Total time is updated, 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 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, when DC-DC converter uses the control mode of down tube modulation in whole life cycle,
It can make temperature by first to fourth switching tube alternately as top tube and down tube, that is, Q1, Q3 and Q2, Q4 alternate plays upper tube, down tube
Stress is equivalent in four switching tubes of H bridges to be uniformly distributed, so that the fever relative equilibrium of each switching tube, is realized whole
Thermal balance extends the service life of DC-DC converter.
In conclusion when DC-DC converter is worked using the control mode of down tube modulation, by recording DC-DC
Converter is that H bridges are controlled using Third Way or fourth way, and total time TC when recording using Third Way and is adopted
Total time TD during with fourth way, then the relationship between TC and TD judge, so as to select control H bridges mode,
The fever of switching tube Q1, Q2, Q3 and Q4 in H bridges can be realized in control mode of the DC-DC converter using down tube modulation
Relative equilibrium is measured, additional component need not be increased in this way, reduce cost, and the working life of DC-DC converter can be increased,
Reduce failure rate.
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.
S5011, used control mode when reading the work of DC-DC converter last time.
S5011 judges the last time using the no control mode for phase shift modulation.If so, perform step S517；Such as
Fruit is no, performs step S502.
In other words, if control mode is the control mode of phase shift modulation used by last work, DC-DC converter
This task will be using the control mode of down tube modulation；If control mode is not phase shift modulation used by last time work
Control mode, then this task of DC-DC converter will be using the control mode of phase shift modulation.
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.
S517 is read with total time TC of Third Way C control H bridges and the total time TD with fourth way D control H bridges.
S518, judges whether TC is more than TD.If so, perform step S519；If not, perform step S523.
S519 selects fourth way D to control H bridges.
S520, DC-DC converter are in the course of work.
S521, judges whether this course of work of DC-DC converter terminates.If so, perform step S522；If
It is no, return to step S520.
S522 records this working time of DC-DC converter, during so as to be started according to DC-DC converter this task
Total time TD obtained from storage region updates total time TD plus this working time.
S523, judges whether TC is less than TD.If so, perform step S524；If not, perform step S528.
S524 selects Third Way C to control H bridges.
S525, DC-DC converter are in the course of work.
S526, judges whether this course of work of DC-DC converter terminates.If so, perform step S527；If
It is no, return to step S525.
S527 records this working time of DC-DC converter, during so as to be started according to DC-DC converter this task
Total time TC obtained from storage region updates total time TC plus this working time.
S528 selects Third Way C or fourth way D to control H bridges.
S529, DC-DC converter are in the course of work.
S530, judges whether this course of work of DC-DC converter terminates.If so, perform step S531；If
It is no, return to step S529.
S531 records this working time of DC-DC converter.Wherein, if selection Third Way C controls H bridges,
During so as to be started according to DC-DC converter this task from total time TC that storage region obtains plus this working time come more
New total time TC；If selection fourth way D 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 TD total time TD plus this working time.
Therefore, in an embodiment of the present invention, in the whole life cycle of DC-DC converter, using phase shift modulation
Control mode and the control mode of down tube modulation alternately, and are based on total time TA when using the control mode of phase shift modulation
With total time TB come select in the first way or second method control H bridges and using down tube modulation control mode when base
It is selected in total time TC and total time TD with Third Way or fourth way control H bridges, so as in whole life cycle, make
DC-DC converter uses total time TA and total time TB during the control mode of phase shift modulation equal as possible and DC-DC changes
Total time TC and total time TD during the control mode that parallel operation is modulated using down tube is equal as possible, it is ensured that the fever of each switching tube
Relative equilibrium substantially increases 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, obtains
Control mode when the DC-DC converter last time works, and control mode when work according to the DC-DC converter last time selects
Control mode during this task so that the control mode of phase shift modulation and down tube tune in DC-DC converter whole life cycle
The control mode of system is alternately.Wherein, it during control mode of the control mode when selecting this work for phase shift modulation, obtains
Take 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
Relationship between total time TB, the side finally controlled according to the relationship selection between total time TA and total time TB H bridges
Formula, to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube；When selection sheet
During control mode for down tube modulation of control mode during task, obtain with total time TC of Third Way control H bridges and with
Fourth way controls the total time TD of H bridges, the relationship between total time TC and total time TD is then judged, finally according to total time
The mode that relationship selection between TC and total time TD controls H bridges, with to first switch pipe, second switch pipe, third
Switching tube and the 4th switching tube carry out temperature equalization control, so as to which in whole life cycle, DC-DC converter uses phase shift tune
Total time TA and total time TB during the control mode of system is equal as possible, and DC-DC converter uses the control mode of down tube modulation
When total time TC and total time TD it is equal as possible so that the fever relative equilibrium of each switching tube, in the feelings for not increasing cost
Under condition, the working life of switching tube in H bridges is improved, 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
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 is used to obtain primary work in the DC-DC converter when the DC-DC converter is worked
Control mode when making, and control when control mode when being worked according to the DC-DC converter last time selects this task
Mode processed, wherein, the control mode of the DC-DC converter includes the control mode of phase shift modulation and the controlling party of down tube modulation
Formula.
Also, during control mode of the control mode when selecting this work for the phase shift modulation, control module 100
Acquisition controls total time TA of the H bridges and controls the total time TB of the H bridges in a second manner, and pass through and sentence in the first way
Disconnected relationship between the total time TA and the total time TB is in a manner of selecting to control the H bridges, with to described
First switch pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, with described first
When mode controls the H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；With
When the second method controls the H bridges, using second bridge arm as leading-bridge, and using first bridge arm as lag
Bridge arm.During the control mode that the control mode when selecting this work is modulated for the down tube, control module 100 is obtained with
Three modes are controlled total time TC of the H bridges and the total time TD of the H bridges are controlled with fourth way, and pass through judge it is described total
Relationship between time TC and the total time TD is in a manner of selecting to control 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, it is controlled with the Third Way
During the H bridges, using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and described
4th switching tube as down tube, and using down tube modulation control mode to the first switch pipe to the 4th switching tube into
Row control；When controlling the H bridges with the fourth way, using the first switch pipe and the third switching tube as down tube with
And using the second switch pipe and the 4th switching tube as upper tube, and the control mode modulated using down tube is to described first
Switching tube to the 4th switching tube is controlled.
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 one embodiment of the invention, DC-DC converter is carried out using the control mode of phase shift modulation
During work, when control module controls H bridges using first method A, what record controlled H bridges using first method A
Time so as to the available total time TA for controlling H bridges in the first way, is then stored；Control module uses second method B
When controlling H bridges, record uses the time that second method B controls H bridges, so as to be controlled in a second manner
The total time TB of H bridges, is then stored.Work is carried out using the control mode of phase shift modulation every time in DC-DC converter in this way
Control module judges the relationship between total time TA and total time TB when making, finally according between total time TA and total time TB
The mode that relationship selection controls H bridges, so as to fulfill to first switch pipe, second switch pipe, third switching tube and the 4th
Switching tube carries 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.
According to one embodiment of present invention, the control module is according between the total time TC and the total time TD
Relationship selection the H bridges are controlled mode when, wherein, when the total time TC is more than the total time TD, institute
Stating control module selects the fourth way to control the H bridges；When the total time TC is less than the total time TD,
The control module selects the Third Way to control the H bridges；When the total time TC is equal to the total time TD
When, the control module selects the Third Way or the fourth way to control the H bridges.
That is, in one embodiment of the invention, DC-DC converter is carried out using the control mode of down tube modulation
During work, when control module controls H bridges using Third Way C, what record controlled H bridges using Third Way C
Time so as to the available total time TC with Third Way control H bridges, is then stored；Control module uses fourth way D
When controlling H bridges, record uses the time that fourth way D controls H bridges, is controlled so as to available with fourth way
The total time TD of H bridges, is then stored.Work is carried out using the control mode of down tube modulation every time in DC-DC converter in this way
Control module judges the relationship between total time TC and total time TD when making, and according to the pass between total time TC and total time TD
System selects the mode controlled H bridges, so as to realize to first switch pipe, second switch pipe, third switching tube and
4th switching tube carries out temperature equalization control.
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.
When being actuated for work, DC-DC is obtained DC-DC converter according to embodiments of the present invention by control module
Control mode when the converter last time works, and control mode when being worked according to the DC-DC converter last time selects this
Control mode during work so that the control mode of phase shift modulation and down tube are modulated in DC-DC converter whole life cycle
Control mode is alternately.Wherein, during control mode of the control mode when selecting this work for phase shift modulation, pass through control
Molding block obtains total time TA of control H bridges in the first way and controls the total time TB of H bridges in a second manner, then judges total
Relationship between time TA and total time TB finally carries out H bridges according to the relationship selection between total time TA and total time TB
The mode of control, to carry out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube；
During the control mode that the control mode when selecting this work is modulated for down tube, obtained by control module with Third Way control
Total time TC of H bridges processed and the total time TD with fourth way control H bridges, then judged between total time TC and total time TD
Relationship, the mode finally controlled according to the relationship selection between total time TC and total time TD H bridges, with to first switch
Pipe, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, so as in whole life cycle, adopt
Total time TA and total time TB during with the control mode of phase shift modulation is equal as possible, during the control mode modulated using down tube
Total time TC and total time TD are equal as possible so that the fever relative equilibrium of each switching tube, in the case where not increasing cost,
The working life of switching tube in H bridges is improved, 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 can control DC-DC converter to use phase shift tune in whole life cycle
System control mode and down tube modulation control mode alternately, and using phase shift modulation control mode when total time
TA and total time TB are equal as possible, using down tube modulate control mode when total time TC and total time TD it is equal as possible, energy
Enough realize carries out temperature equalization control to first switch pipe, second switch pipe, third switching tube and the 4th switching tube in H bridges,
So that the fever relative equilibrium of each switching tube, in the case where not increasing cost, improves the working life of switching tube in H bridges,
So as to extend the life cycle of DC-DC 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, 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：
When the DC-DC converter is worked, the control mode during DC-DC converter last time work is obtained, and
Control mode when being worked according to the DC-DC converter last time selects control mode during this task, wherein, it is described
The control mode of DC-DC converter includes the control mode of phase shift modulation and the control mode of down tube modulation；
During control mode for the phase shift modulation of control mode when selecting this work, acquisition controls institute in the first way
State total time TA of H bridges and control the total time TB of the H bridges in a second manner, and pass through judge the total time TA with it is described
Relationship between total time TB is in a manner of selecting to control 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, it, will when controlling the H bridges with the first method
First bridge arm is as leading-bridge, and using second bridge arm as lagging leg；The H is controlled with the second method
During bridge, using second bridge arm as leading-bridge, and using first bridge arm as lagging leg；
During the control mode that the control mode when selecting this work is modulated for the down tube, obtain and institute is controlled with Third Way
State total time TC of H bridges and the total time TD of the H bridges controlled with fourth way, and pass through judge the total time TC with it is described
Relationship between total time TD is in a manner of selecting to control 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, it, will when controlling the H bridges with the Third Way
The first switch pipe and the third switching tube are made as upper tube and by the second switch pipe and the 4th switching tube
Control mode for down tube, and use down tube modulation controls the first switch pipe to the 4th switching tube；With institute
When stating fourth way and controlling the H bridges, using the first switch pipe and the third switching tube as down tube and by described the
Two switching tubes and the 4th switching tube are as upper tube, and the control mode modulated using down tube is to the first switch pipe to institute
The 4th switching tube is stated to be controlled.
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 wherein,
When controlling the H bridges with the first method, control signal to the first switch pipe and output are exported to described the
The control signal of two switching tubes is complementary and exports to the control signal of the third switching tube and output to the described 4th switch
The control signal of pipe is complementary, and the first switch pipe previous phase angle super than the 4th switching tube is opened and described
Second switch pipe previous phase angle super than the third switching tube is open-minded；
When controlling the H bridges with the second method, control signal to the first switch pipe and output are exported to described the
The control signal of two switching tubes is complementary and exports to the control signal of the third switching tube and output to the described 4th switch
The control signal of pipe is complementary, and the 4th switching tube previous phase angle super than the first switch pipe is opened and described
Third switching tube previous phase angle super than the second switch pipe is open-minded.
4. the control method of DC-DC converter as described in claim 1, which is characterized in that according to the total time TC and institute
The mode that the selection of the relationship between total time TD controls the H bridges is stated, is specifically included：
When the total time TC is more than the total time TD, the fourth way is selected to control the H bridges；
When the total time TC is less than the total time TD, the Third Way is selected to control the H bridges；
When the total time TC is equal to the total time TD, the Third Way or the fourth way are selected to the H bridges
It is controlled.
5. the control method of DC-DC converter as described in claim 1 or 4, which is characterized in that wherein,
When controlling the H bridges with the Third Way, control signal to the first switch pipe and output are exported to described the
The control signal of three switching tubes is complementary and is fixed duty cycle, and to output to the second switch pipe and the 4th switching tube
Control signal failing edge carry out PWM controls；
When controlling the H bridges with the fourth way, control signal to the second switch pipe and output are exported to described the
The control signal of four switching tubes is complementary and is fixed duty cycle, and to output to the first switch pipe and the third switching tube
Control signal failing edge carry out PWM controls.
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, 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 are used to obtain the DC-DC converter when the DC-DC converter is worked
Control mode during one action, and control mode when being worked according to the DC-DC converter last time selects this task
When control mode, the control mode of the DC-DC converter includes the control mode of phase shift modulation and the control of down tube modulation
Mode, wherein,
During control mode for the phase shift modulation of control mode when selecting this work, the control module is obtained with the
One mode controls total time TA of the H bridges and controls the total time TB of the H bridges in a second manner, and pass through judge it is described total
Relationship between time TA and the total time TB is in a manner of selecting to control 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, it is controlled with the first method
During the H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；With described second
When mode controls the H bridges, using second bridge arm as leading-bridge, and using first bridge arm as lagging leg；
During the control mode that the control mode when selecting this work is modulated for the down tube, the control module is obtained with the
Three modes are controlled total time TC of the H bridges and the total time TD of the H bridges are controlled with fourth way, and pass through judge it is described total
Relationship between time TC and the total time TD is in a manner of selecting to control 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, it is controlled with the Third Way
During the H bridges, using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and described
4th switching tube as down tube, and using down tube modulation control mode to the first switch pipe to the 4th switching tube into
Row control；When controlling the H bridges with the fourth way, using the first switch pipe and the third switching tube as down tube with
And using the second switch pipe and the 4th switching tube as upper tube, and the control mode modulated using down tube is to described first
Switching tube to the 4th switching tube is controlled.
7. DC-DC converter as claimed in claim 6, 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.
8. DC-DC converter as claimed in claims 6 or 7, which is characterized in that wherein,
When controlling the H bridges with the first method, the control module export control signal to the first switch pipe with
The control signal of output to the second switch pipe is complementary and exports to the control signal of the third switching tube with exporting extremely
The control signal of 4th switching tube is complementary, and the first switch pipe previous phase angle super than the 4th switching tube is opened
Logical and described second switch pipe previous phase angle super than the third switching tube is open-minded；
When controlling the H bridges with the second method, the control module export control signal to the first switch pipe with
The control signal of output to the second switch pipe is complementary and exports to the control signal of the third switching tube with exporting extremely
The control signal of 4th switching tube is complementary, and the 4th switching tube previous phase angle super than the first switch pipe is opened
Logical and described third switching tube previous phase angle super than the second switch pipe is open-minded.
9. DC-DC converter as claimed in claim 6, which is characterized in that the control module according to the total time TC with
During the mode that the relationship selection between the total time TD controls the H bridges, wherein,
When the total time TC is more than the total time TD, the control module select the fourth way to the H bridges into
Row control；
When the total time TC is less than the total time TD, the control module select the Third Way to the H bridges into
Row control；
When the total time TC is equal to the total time TD, the control module selects the Third Way or the four directions
Formula controls the H bridges.
10. the DC-DC converter as described in claim 6 or 9, which is characterized in that wherein,
When controlling the H bridges with the Third Way, the control module export control signal to the first switch pipe with
The control signal of output to the third switching tube is complementary and is fixed duty cycle, and to output to the second switch pipe and institute
The failing edge for stating the control signal of the 4th switching tube carries out PWM controls；
When controlling the H bridges with the fourth way, the control module export control signal to the second switch pipe with
The control signal of output to the 4th switching tube is complementary and is fixed duty cycle, and to output to the first switch pipe and institute
The failing edge for stating the control signal of third switching tube carries out PWM controls.
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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102791072A (en) * | 2011-05-20 | 2012-11-21 | 东软飞利浦医疗设备***有限责任公司 | High power high voltage generator |
| CN104600998A (en) * | 2015-02-10 | 2015-05-06 | 四川英杰电气股份有限公司 | Method for controlling uniform heating of switch device of switch power source |
| US9214865B2 (en) * | 2010-04-20 | 2015-12-15 | Rf Micro Devices, Inc. | Voltage compatible charge pump buck and buck power supplies |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9214865B2 (en) * | 2010-04-20 | 2015-12-15 | Rf Micro Devices, Inc. | Voltage compatible charge pump buck and buck power supplies |
| CN102791072A (en) * | 2011-05-20 | 2012-11-21 | 东软飞利浦医疗设备***有限责任公司 | High power high voltage generator |
| CN104600998A (en) * | 2015-02-10 | 2015-05-06 | 四川英杰电气股份有限公司 | Method for controlling uniform heating of switch device of switch power source |
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