CN108155809A - 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 PDF

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Publication number
CN108155809A
CN108155809A CN201611111281.3A CN201611111281A CN108155809A CN 108155809 A CN108155809 A CN 108155809A CN 201611111281 A CN201611111281 A CN 201611111281A CN 108155809 A CN108155809 A CN 108155809A
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China
Prior art keywords
bridges
control
switching tube
converter
switch pipe
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Application number
CN201611111281.3A
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Chinese (zh)
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CN108155809B (en
Inventor
张妮
王兴辉
王超
沈晓峰
邬白贺
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN201611111281.3A priority Critical patent/CN108155809B/en
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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 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, first method or second method is selected to control H bridges based on total time TA and TB when using the control mode of phase shift modulation, it is selected in the first way based on setting time Tx and Ty again or second method alternately controls H bridges, and it selects alternately to control H bridges with Third Way or fourth way based on setting time Ti and Tm in the control mode for using down tube modulation, to carry out temperature equalization control to tetra- switching tubes of first switch Guan Zhi, 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

The control method of electric vehicle and its DC-DC converter and DC-DC converter
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 obtain in the first way It takes in the course of work that the DC-DC converter uses the control mode of the phase shift modulation to carry out in each working cycles with institute State first method control the H bridges setting time Tx and with the second method control the H bridges setting time Ty and To described during by judging the relationship between the total time TA and the total time TB to select the DC-DC converter startup The mode that H bridges are controlled, and alternately control carries out the H bridges according to the setting time Tx and the setting time Ty, To carry out temperature equalization control to the first switch pipe, second switch pipe, third switching tube and the 4th switching tube, wherein, with When the 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 by 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 with third Mode is controlled 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 The time Ti and setting time Tm carries out the H bridges alternately to control 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 described the One switching tube 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 the four directions When formula controls the H bridges, using the first switch pipe and the third switching tube as down tube and by the second switch pipe With the 4th switching tube as upper tube, and the first switch pipe to the described 4th is opened using the control mode of down tube modulation Pipe is closed to be 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 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, and obtain DC-DC converter When controlling the setting of H bridges in the first way in each working cycles in the course of work carried out using the control mode of phase shift modulation Between Tx and in a second manner control H bridges setting time Ty, then judge the relationship between total time TA and total time TB, finally The mode controlled when being started according to the relationship selection DC-DC converter between total time TA and total time TB H bridges, and In the course of work of DC-DC converter according to Tx and Ty to H bridges carry out alternately control, with to first switch pipe, second switch pipe, Third switching tube and the 4th switching tube carry out temperature equalization control；What the control mode when selecting this work was modulated for down tube During control mode, obtain with the setting time Ti of the Third Way control H bridges and setting time Tm with fourth way control H bridges, Then H bridges are carried out according to Ti and Tm alternately controlling with to first switch pipe, second switch pipe, third switching tube and the 4th switch Pipe carries out temperature equalization control, thus in whole life cycle, root when DC-DC converter uses the control mode of phase shift modulation According to total time TA of record with first method or second method is first selected to be controlled H bridges and then used again total time TB First method and second method alternately control H bridges, and DC-DC converter is led to when being worked using the control mode of down tube modulation It crosses Third Way and fourth way and alternately controls H bridges so that the fever relative equilibrium of each switching tube is not increasing cost In the case of, the working life of switching tube in raising H bridges, 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 It makes total time TA of the H bridges and controls the total time TB of the H bridges in a second manner, and obtain the DC-DC converter and adopt The H is controlled with the first method in each working cycles in the course of work carried out with the control mode of the phase shift modulation Setting time Tx of bridge and the setting time Ty of the H bridges is controlled and by judging the total time with the second method In a manner of relationship between TA and the total time TB controls the H bridges when the DC-DC converter is selected to start, And according to it is described setting time Tx and it is described setting time Ty to the H bridges carry out alternately control, with to the first switch pipe, Second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, with described in first method control During H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；With the second method When controlling the H bridges, using second bridge arm as leading-bridge, and using first bridge arm as lagging leg；Work as selection During the control mode that control mode during this task is modulated for the down tube, the control module acquisition is 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, and according to setting time Ti and It is described setting time Tm to the H bridges carry out alternately control with to the first switch pipe, second switch pipe, third switching tube and 4th switching tube carries out temperature equalization control, wherein, when controlling the H bridges with the Third Way, by the first switch pipe With the third switching tube as upper tube and using the second switch pipe and the 4th switching tube as down tube, and under use The control mode of pipe modulation controls the first switch pipe to the 4th switching tube；Institute is controlled with the fourth way When stating H bridges, 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.
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, and obtain DC- H bridges are controlled in the first way in each working cycles in the course of work that DC converters are carried out using the control mode of phase shift modulation Setting time Tx and in a second manner control H bridges setting time Ty, then judge between total time TA and total time TB Relationship controls H bridges when finally being started according to the relationship selection DC-DC converter between total time TA and total time TB Mode, and alternately control carries out H bridges according to Tx and Ty in the course of work of DC-DC converter, with to first switch pipe, the Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control；Control mode when selecting this work for During the control mode of down tube modulation, obtained by control module and the setting time Ti of H bridges is controlled and with four directions with Third Way Formula controls the setting time Tm of H bridges, alternately control is then carried out to H bridges according to Ti and Tm, with to first switch pipe, second switch Pipe, third switching tube and the 4th switching tube carry out temperature equalization control, thus in whole life cycle, using phase shift modulation According to total time TA of record with first selecting first method or second method total time TB to H bridges when control mode is worked It is controlled and then H bridges is alternately controlled using first method and second method again, carried out using the control mode of down tube modulation H bridges are alternately controlled by Third Way and fourth way during work so that the fever relative equilibrium of each switching tube, not In the case of 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 The control mode of control mode and the down tube modulation of system alternately, and when being worked using the control mode of phase shift modulation First method or second method is first selected to control H bridges with total time TB according to total time TA of record, then used again First method and second method alternately control H bridges, and the control mode modulated using down tube passes through Third Way when being worked H bridges are alternately controlled with fourth way, can realize in H bridges first switch pipe, second switch pipe, third switching tube and 4th switching tube carries out temperature equalization control 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 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 DC-DC converter is obtained using phase shift modulation In the course of work that control mode carries out the setting time Tx of H bridges is controlled in the first way and with second party in each working cycles The setting time Ty of formula control H bridges and by judging the relationship between total time TA and total time TB DC-DC to be selected to convert The mode that device controls H bridges when starting, and alternately control carries out H bridges according to setting time Tx and setting time Ty, with Temperature equalization control is carried out to first switch pipe, second switch pipe, third switching tube and the 4th switching tube.
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, record uses the time that first method A controls H bridges, so as to the available total time for controlling H bridges in the first way Then TA is stored；When being controlled such that DC-DC converter works to H bridges using second method B, record uses The time that second method B controls H bridges so as to the available total time TB for controlling H bridges in a second manner, is then deposited Storage.Then when DC-DC converter is started worked with the control mode of phase shift modulation every time, judge total time TA with it is total when Between relationship between TB, to H bridges when finally being started according to the relationship selection DC-DC converter between total time TA and total time TB The mode controlled.
Specifically, according to one embodiment of present invention, according to the pass between the total time TA and the total time TB During the mode controlled when system selects the DC-DC converter to start to the H bridges, wherein, when the total time TA is more than During the total time TB, the second method is selected to control the H bridges when the DC-DC converter starts, until The total time TA is equal to the total time TB；When the total time TA is less than the total time TB, converted in the DC-DC Device selects the first method to control the H bridges when starting, until the total time TA is equal to the total time TB；When When the total time TA is equal to the total time TB, the first method or described is selected when the DC-DC converter starts Second method with according to Tx and Ty to the H bridges carry out alternately control.
Wherein, alternately control carries out the H bridges according to the setting time Tx and the setting time Ty, including：When When the time of the H bridges being controlled to reach Tx using the first method, the H bridges are controlled using the second method, Until the time for controlling the H bridges using the second method reaches Ty；Or when using the second method control H bridges Time when reaching Ty, the H bridges are controlled using the first method, until using described in first method control The time of H bridges reaches Tx.
That is, DC-DC converter using phase shift modulation control mode work before, from storage region obtain with Total time TA of first method control H bridges and the total time TB for controlling H bridges in a second manner, then Tx and Ty are set, then to total Are judged time TA and total time TB, determine first to control H bridges using first method or first adopt according to judging result H bridges are controlled with second method, i.e., obtain total time TA of control H bridges in the first way from storage region and are controlled in a second manner The total time TB of H bridges processed, and the purpose that the relationship between total time TA and total time TB is judged is to confirm DC-DC transformation The mode controlled H bridges that device first selects when starting.If for example, the TA=20 minutes, TB=18 minutes that get, DC- DC converters first select second method B to be controlled such that DC-DC converter starts work, and 2 to H bridges in this task It is switched to after minute and DC-DC converter, which works, to be controlled such that H bridges using first method A, until using first party The time that formula A controls H bridges reaches Tx, then is switched to and is controlled such that DC-DC is converted to H bridges using second method B Device works, until reaching Ty using the time that second method B controls H bridges, so completes a working cycles (i.e. One net cycle time=Tx+Ty), then be switched to H bridges are controlled such that using first method A DC-DC converter into Row work until reaching Tx using the time that first method A controls H bridges, is then switched to using second method B to H Bridge is controlled such that DC-DC converter works, until being reached using the time that second method B controls H bridges Ty ... ... is so repeated, and realizes and alternately control is carried out to H bridges, so as to fulfill to first switch pipe, second switch pipe, the Three switching tubes and the 4th switching tube carry out temperature equalization control.And if the TA=18 minutes, TB=20 minutes that get, DC-DC converter first selects first method A to be controlled such that DC-DC converter starts work to H bridges in this task, and It is switched to after the 2 minutes and DC-DC converter, which works, to be controlled such that H bridges using second method B, until using second The time that mode B controls H bridges reaches Ty, then is switched to and is controlled such that DC-DC becomes to H bridges using first method A Parallel operation works, until reaching Tx using the time that first method A controls H bridges, so completes a working cycles (i.e. a net cycle time=Tx+Ty), then be switched to and DC-DC converter is controlled such that H bridges using second method B It works, until the time controlled H bridges using second method B reaches Ty, then switches to using A pairs of first method H bridges are controlled such that DC-DC converter works, until being reached using the time that first method A controls H bridges Tx ... ... is so repeated, and realizes and alternately control is carried out to H bridges, so as to fulfill to first switch pipe, second switch pipe, the Three switching tubes and the 4th switching tube carry out temperature equalization control.
Certainly, when total time TA got being equal to total time TB, in DC-DC converter with the controlling party of phase shift modulation Formula directly first can be controlled such that DC-DC converter works using first method A when starting to H bridges, until using the The time that one mode A controls H bridges reaches Tx, is switched to and is controlled such that DC-DC becomes to H bridges using second method B Parallel operation works, until reaching Ty using the time that second method B controls H bridges, so completes a working cycles (i.e. a net cycle time=Tx+Ty), then be switched to and DC-DC converter is controlled such that H bridges using first method A It works, until the time controlled H bridges using first method A reaches Tx, then switches to using B pairs of second method H bridges are controlled such that DC-DC converter works, until being reached using the time that second method B controls H bridges Ty ... ... is so repeated, and realizes and alternately control is carried out to H bridges, so as to fulfill to first switch pipe, second switch pipe, the Three switching tubes and the 4th switching tube carry out temperature equalization control.Alternatively, when total time TA got being equal to total time TB, DC-DC converter also can directly first be controlled such that H bridges using second method B when being started with the control mode of phase shift modulation DC-DC converter works, until reaching Ty using the time that second method B controls H bridges, is switched to using first Mode A is controlled such that DC-DC converter works to H bridges, until using first method A to H bridges controlled when Between reach Tx, so complete a working cycles, and be repeated according to such working cycles, until DC-DC converter is stopped Only work.
Wherein, mode is chosen in each working cycles later just according to fixed form i.e. first method or second method control H bridges processed, when switching mode, record total time, for example, in the ban using first method control H bridges when, when switching mode record with First method control H bridges obtain in the first way when starting for DC-DC converter this task total time from storage region The total time of H bridges is controlled plus DC-DC converter this working cycles interior time for controlling H bridges in the first way recorded.
In one embodiment of the invention, the setting time Tx controlled with the first method the H bridges can Equal to the setting time Ty controlled with the second method the H bridges, can ensure so in the first way with second 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 first method Setting time Tx of control can not also be equal with the setting time Ty controlled with the second method the 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.
According to one embodiment of present invention, setting time Tx controlled with the first method the H bridges etc. In the setting time Ty controlled with the second method the H bridges, can ensure so in the first way and second party Formula ensures first switch pipe Q1, second switch pipe Q2, third switching tube Q3 and the 4th switching tube Q4 fever phases when alternately controlling H bridges To balance.
It is, of course, understood that in other embodiments of the invention, the H bridges are carried out with the first method Setting time Tx of control can not also be equal with the setting time Ty controlled with the second method the H bridges.
In conclusion when DC-DC converter is worked using the control mode of phase shift modulation, during total based on record Between TA and total time TB first method or second method is selected to be started, then select the according to setting time Tx and Ty One mode and second method carry out H bridges alternately control, can be real in control mode of the DC-DC converter using phase shift modulation The calorific value relative equilibrium of switching tube Q1, Q2, Q3 and Q4 in existing H bridges, need not increase additional component, reduce into this way This, 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 The setting time Ti of the H bridges processed and setting time Tm with fourth way control H bridges, and according to setting time Ti and setting time Tm H bridges are carried out alternately to control to carry out temperature equalization to first switch pipe, second switch pipe, third switching tube and the 4th switching tube 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 carried out every time using the control mode of down tube modulation During work, Ti and Tm is first set, then in the course of work of DC-DC converter, first H bridges can be carried out using Third Way C It controls so that DC-DC converter works, until reaching Ti using the time that Third Way C controls H bridges, is switched to DC-DC converter, which works, to be controlled such that H bridges using fourth way D, until being carried out using fourth way D to H bridges The time of control reaches Tm, so completes a working cycles (i.e. a net cycle time=Ti+Tm), then be switched to use Third Way C is controlled such that DC-DC converter works to H bridges, until being controlled using Third Way C H bridges Time reach Ti, then switch to and DC-DC converter, which works, to be controlled such that H bridges using fourth way D, until Tm is reached using the fourth way D times controlled H bridges ... ..., be so repeated, realized and alternately control is carried out to H bridges System carries out temperature equalization control so as to fulfill to first switch pipe, second switch pipe, third switching tube and the 4th switching tube.When So, in the course of work of DC-DC converter, also can DC-DC converter be first controlled such that H bridges using fourth way D It works, until reaching Tm using the time that fourth way D controls H bridges, is switched to using Third Way C to H bridges It is controlled such that DC-DC converter works, until reaching Ti using the time that Third Way C controls H bridges, such as This completes a working cycles, and is repeated according to such working cycles, until DC-DC converter stops this task.
In other words, alternately control carries out the H bridges according to setting time Ti and setting time Tm, including：When described in use When Third Way controls the time of the H bridges to reach Ti, the H bridges are controlled using the fourth way, until using The fourth way controls the time of the H bridges to reach Tm；Or when the time using the fourth way control H bridges reaches During to Tm, the H bridges are controlled using the Third Way, until using the Third Way control the H bridges when Between reach 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 one embodiment of the present of invention, DC-DC converter is in whole life cycle using the controlling party of down tube modulation During formula, it can make 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 Temperature 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 The thermal balance of body extends 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.
In a preferred embodiment of the invention, Tx can be equal to Ty, Ti can be equal to Tm, and Tx can also simultaneously etc. In Ti.
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.
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 S512；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 sets Tx and Ty.
S504, judges whether TA is more than TB.If so, perform step S505；If not, perform step S506.
S505 selects second method B to control H bridges, until TA=TB, then performs step S508.
S506, judges whether TA is less than TB.If so, perform step S507；If not, perform step S508 or S509.
S507 selects first method A to control H bridges, until TA=TB, then performs step S509.
S508 is controlled such that DC-DC converter works, and during the work time using first method A to H bridges Judge whether this task terminates, if so, terminating flow, continue to judge if not, returning.
S509 is controlled such that DC-DC converter works, and during the work time using second method B to H bridges Judge whether this task terminates, if so, terminating flow, continue to judge if not, returning.
S510 judges whether the time using first method A control H bridges reaches Tx.If so, perform step S509；Such as Fruit is no, return to step S508.
S511 judges whether the time using second method B control H bridges reaches Ty.Step is performed if so, returning S508；If not, return to step S509.
S512 sets Ti and Tm.
S513 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.
S514 judges whether the time using Third Way C control H bridges reaches Ti.If so, perform step S515；Such as Fruit is no, return to step S513.
S515 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.
S516 judges whether the time using fourth way D control H bridges reaches Tm.Step is performed if so, returning S513；If not, return to step S515.
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, come cause DC-DC converter startup, be then based on setting Put time Tx and Ty select in the first way or second method alternately control H bridges and using down tube modulation controlling party It selects alternately to control H bridges with Third Way or fourth way based on setting time Ti and Tm during formula, so as in entire Life Cycle In phase, according to total time TA of record and total time TB when DC-DC converter is worked using the control mode of phase shift modulation First method or second method is first selected to be controlled H bridges and then replaced again using first method and second method to H bridges Third Way and fourth way alternately control H bridges when controlling, and being worked using the control mode of down tube modulation, really The fever relative equilibrium of each switching tube is protected, 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 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, and obtain DC-DC converter When controlling the setting of H bridges in the first way in each working cycles in the course of work carried out using the control mode of phase shift modulation Between Tx and in a second manner control H bridges setting time Ty, then judge the relationship between total time TA and total time TB, finally The mode controlled when being started according to the relationship selection DC-DC converter between total time TA and total time TB H bridges, and In the course of work of DC-DC converter according to Tx and Ty to H bridges carry out alternately control, with to first switch pipe, second switch pipe, Third switching tube and the 4th switching tube carry out temperature equalization control；What the control mode when selecting this work was modulated for down tube During control mode, obtain with the setting time Ti of the Third Way control H bridges and setting time Tm with fourth way control H bridges, Then H bridges are carried out according to Ti and Tm alternately controlling with to first switch pipe, second switch pipe, third switching tube and the 4th switch Pipe carries out temperature equalization control, thus in whole life cycle, root when DC-DC converter uses the control mode of phase shift modulation According to total time TA of record with first method or second method is first selected to be controlled H bridges and then used again total time TB First method and second method alternately control H bridges, and DC-DC converter is led to when being worked using the control mode of down tube modulation It crosses Third Way and fourth way and alternately controls H bridges so that the fever relative equilibrium of each switching tube is not increasing cost In the case of, the working life of switching tube in raising H bridges, 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 obtain institute in the first way It states in the course of work that DC-DC converter uses the control mode of the phase shift modulation to carry out in each working cycles with described the One mode controls setting time Tx of the H bridges and controls the setting time Ty of the H bridges with the second method and pass through To the H bridges when judging the relationship between the total time TA and the total time TB to select the DC-DC converter startup The mode controlled, and alternately control carries out the H bridges according to the setting time Tx and the setting time Ty, 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, control module 100 obtains It takes with the setting time Ti of the Third Way control H bridges and setting time Tm with the fourth way control H bridges, and according to The setting time Ti and setting time Tm carries out the H bridges alternately to control 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 Third Way, Using the first switch pipe and the third switching tube as upper tube and by the second switch pipe and the 4th switching tube The first switch pipe to the 4th switching tube is controlled as down tube, and using the control mode of down tube modulation；With When the fourth way controls the H bridges, using the first switch pipe and the third switching tube as down tube and by described in Second switch pipe and the 4th switching tube as upper tube, and using down tube modulation control mode to the first switch pipe extremely 4th switching tube is controlled.
In an embodiment of the present invention, during selecting with the control mode control DC-DC converter of phase shift modulation, When control module is controlled such that DC-DC converter works using first method A to H bridges, record is using first method A To the time that H bridges are controlled, so as to the available total time TA for controlling H bridges in the first way, then stored；Control mould When block is controlled such that DC-DC converter works using second method B to H bridges, record is using second method B to H bridges The time controlled so as to the available total time TB for controlling H bridges in a second manner, is then stored.Then in DC-DC When converter starts, control module judges the relationship between total time TA and total time TB, and according to total time TA and total time The mode that relationship selection DC-DC converter between TB controls H bridges when starting.
Specifically, according to one embodiment of present invention, the control module according to the total time TA with it is described total when Between relationship between TB the H bridges are controlled when selecting the DC-DC converter to start mode when, wherein, when described When total time TA is more than the total time TB, the control module selects the second party when the DC-DC converter starts Formula controls the H bridges, until the total time TA is equal to the total time TB；When the total time TA is total less than described During time TB, the control module selects the first method to control the H bridges when the DC-DC converter starts System, until the total time TA is equal to the total time TB；When the total time TA is equal to the total time TB, the control Module selected when the DC-DC converter starts the first method or the second method with according to Tx and Ty to the H Bridge carries out alternately control.
Also, when the control module to the H bridges alternately control according to setting time Tx and setting time Ty, In, when the time of the H bridges being controlled to reach Tx using the first method, the H bridges are carried out using the second method Control, until reaching Ty using the time of the second method control H bridges；Or when using second method control institute When stating time of H bridges and reaching Ty, the H bridges are controlled using the first method, until using the first method control The time for making the H bridges reaches Tx.
That is, before DC-DC converter is using the control mode work of phase shift modulation, control module is from memory block Domain 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 set Tx and Ty, Then total time TA and total time TB are judged determine it is that H bridges are first controlled using first method according to judging result Still H bridges are first controlled using second method, i.e., obtains total time TA of control H bridges in the first way and from storage region with the Two modes control the total time TB of H bridges, and the purpose that the relationship between total time TA and total time TB is judged is to confirm The mode controlled H bridges that DC-DC converter first selects when starting.For example, if the TA=20 minutes got, TB=18 divide Clock, then DC-DC converter first selected in this task second method B H bridges are controlled such that DC-DC converter start work Make, and be switched to DC-DC converter, which works, to be controlled such that H bridges using first method A after the 2 minutes, until adopting Reach Tx with the first method A times controlled H bridges, then be switched to and H bridges are controlled such that using second method B DC-DC converter works, until reaching Ty using the time that second method B controls H bridges, so completes a work (i.e. a net cycle time=Tx+Ty) is recycled, then is switched to and DC-DC is controlled such that H bridges using first method A Converter works, until reaching Tx using the time that first method A controls H bridges, then switches to using second Mode B is controlled such that DC-DC converter works to H bridges, until using second method B to H bridges controlled when Between reach Ty ... ..., 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.And if the TA=18 minutes got, TB=20 point Clock, then DC-DC converter first selected in this task first method A H bridges are controlled such that DC-DC converter start work Make, and be switched to DC-DC converter, which works, to be controlled such that H bridges using second method B after the 2 minutes, until adopting Reach Ty with the second method B times controlled H bridges, then be switched to and H bridges are controlled such that using first method A DC-DC converter works, until reaching Tx using the time that first method A controls H bridges, so completes a work (i.e. a net cycle time=Tx+Ty) is recycled, then is switched to and DC-DC is controlled such that H bridges using second method B Converter works, until reaching Ty using the time that second method B controls H bridges, then switches to using first Mode A is controlled such that DC-DC converter works to H bridges, until using first method A to H bridges controlled when Between reach Tx ... ..., 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, control module is when total time TA got being equal to total time TB, in DC-DC converter with phase shift modulation Control mode start when can DC-DC converter, which works, first directly be controlled such that H bridges using first method A, directly Reach Tx to using the time that first method A controls H bridges, be switched to and H bridges are controlled such that using second method B DC-DC converter works, until reaching Ty using the time that second method B controls H bridges, so completes a work (i.e. a net cycle time=Tx+Ty) is recycled, then is switched to and DC-DC is controlled such that H bridges using first method A Converter works, until reaching Tx using the time that first method A controls H bridges, then switches to using second Mode B is controlled such that DC-DC converter works to H bridges, until using second method B to H bridges controlled when Between reach Ty ... ..., 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.Alternatively, control module is in total time TA got etc. When total time TB, B pairs of second method also directly can be first used when DC-DC converter is started with the control mode of phase shift modulation H bridges are controlled such that DC-DC converter works, until being reached using the time that second method B controls H bridges Ty is switched to and is controlled such that DC-DC converter works to H bridges using first method A, until using first method A The time controlled H bridges reaches Tx, so completes a working cycles, and be repeated according to such working cycles, Until DC-DC converter is stopped.
Wherein, mode is chosen in each working cycles later just according to fixed form i.e. first method or second method control H bridges processed, when switching mode, record total time, for example, in the ban using first method control H bridges when, when switching mode record with First method control H bridges obtain in the first way when starting for DC-DC converter this task total time from storage region The total time of H bridges is controlled plus DC-DC converter this working cycles interior time for controlling H bridges in the first way recorded.
Wherein, in a preferred embodiment of the invention, the setting controlled with the first method the H bridges Time Tx can be equal to the setting time Ty controlled with the second method the H bridges.It can ensure with first party in this way Formula and second method 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 first method Setting time Tx of control can not also be equal with the setting time Ty controlled with the second method the H bridges.
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 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, DC-DC converter is carried out every time using the control mode of down tube modulation During work, control module first sets Ti and Tm, then in the course of work of DC-DC converter, can first use C pairs of Third Way H bridges are controlled such that DC-DC converter works, until being reached using the time that Third Way C controls H bridges Ti is switched to and is controlled such that DC-DC converter works to H bridges using fourth way D, until using fourth way D The time controlled H bridges reaches Tm, so completes a working cycles (i.e. a net cycle time=Ti+Tm), then It is switched to and DC-DC converter, which works, to be controlled such that H bridges using Third Way C, until using Third Way C to H The time that bridge is controlled reaches Ti, then switch to H bridges are controlled such that using fourth way D DC-DC converter into Row work until reaching Tm using the time that fourth way D controls H bridges ... ..., is so repeated, realizes to H bridges Alternately control is carried out, so as to fulfill equal into trip temperature to first switch pipe, second switch pipe, third switching tube and the 4th switching tube Weighing apparatus control.Certainly, in the course of work of DC-DC converter, control module also can first control H bridges using fourth way D It makes so that DC-DC converter works, until reaching Tm using the time that fourth way D controls H bridges, is switched to and adopts DC-DC converter, which works, to be controlled such that H bridges with Third Way C, until being controlled using Third Way C to H bridges The time of system reaches Ti, so completes a working cycles, and be repeated according to such working cycles, until DC-DC becomes Parallel operation 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.
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, and obtain DC- H bridges are controlled in the first way in each working cycles in the course of work that DC converters are carried out using the control mode of phase shift modulation Setting time Tx and in a second manner control H bridges setting time Ty, then judge between total time TA and total time TB Relationship controls H bridges when finally being started according to the relationship selection DC-DC converter between total time TA and total time TB Mode, and alternately control carries out H bridges according to Tx and Ty in the course of work of DC-DC converter, with to first switch pipe, the Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control；Control mode when selecting this work for During the control mode of down tube modulation, obtained by control module and the setting time Ti of H bridges is controlled and with four directions with Third Way Formula controls the setting time Tm of H bridges, alternately control is then carried out to H bridges according to Ti and Tm, with to first switch pipe, second switch Pipe, third switching tube and the 4th switching tube carry out temperature equalization control, thus in whole life cycle, using phase shift modulation According to total time TA of record with first selecting first method or second method total time TB to H bridges when control mode is worked It is controlled and then H bridges is alternately controlled using first method and second method again, carried out using the control mode of down tube modulation H bridges are alternately controlled by Third Way and fourth way during work so that the fever relative equilibrium of each switching tube, not In the case of 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 The control mode of control mode and the down tube modulation of system alternately, and when being worked using the control mode of phase shift modulation First method or second method is first selected to control H bridges with total time TB according to total time TA of record, then used again First method and second method alternately control H bridges, and the control mode modulated using down tube passes through Third Way when being worked H bridges are alternately controlled with fourth way, can realize in H bridges first switch pipe, second switch pipe, third switching tube and 4th switching tube carries out temperature equalization control 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 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 (15)

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 It states total time TA of H bridges and controls the total time TB of the H bridges in a second manner, and obtain the DC-DC converter using institute It states in the course of work of the control mode progress of phase shift modulation and the H bridges is controlled with the first method in each working cycles Setting time Tx and with the second method control the H bridges setting time Ty and by judge the total time TA with In a manner of relationship between the total time TB controls the H bridges when the DC-DC converter is selected to start, and root Alternately control is carried out to the H bridges according to the setting time Tx and the setting time Ty, with to the first switch pipe, second Switching tube, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, the H bridges are controlled with the first method When, using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；It is controlled with the second method During 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, obtain and institute is controlled with Third Way It states the setting time Ti of H bridges and the setting time Tm of the H bridges is controlled with fourth way, and according to the setting time Ti and institute Setting time Tm is stated the H bridges are carried out alternately to control with to the first switch pipe, second switch pipe, third switching tube and the Four switching tubes carry out temperature equalization control, wherein, when controlling the H bridges with the Third Way, by the first switch pipe and The third switching tube uses down tube as upper tube and using the second switch pipe and the 4th switching tube as down tube The control mode of modulation controls the first switch pipe to the 4th switching tube；With described in fourth way control During H bridges, using the first switch pipe and the third switching tube as down tube and by the second switch pipe and the described 4th Switching tube controls the first switch pipe to the 4th switching tube as upper tube, and using the control mode of down tube modulation System.
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 When stating the mode controlled when relationship between total time TB selects the DC-DC converter to start to the H bridges, wherein,
When the total time TA is more than the total time TB, the second method is selected when the DC-DC converter starts The H bridges are controlled, until the total time TA is equal to the total time TB；
When the total time TA is less than the total time TB, the first method is selected when the DC-DC converter starts The H bridges are controlled, until the total time TA is equal to the total time TB；
When the total time TA is equal to the total time TB, the first method is selected when the DC-DC converter starts Or the second method with according to Tx and Ty to the H bridges carry out alternately control.
3. the control method of DC-DC converter as claimed in claim 1 or 2, which is characterized in that according to the setting time Tx Alternately control is carried out to the H bridges with the setting time Ty, is specifically included：
When the time of the H bridges being controlled to reach Tx using the first method, the H bridges are carried out using the second method Control, until reaching Ty using the time of the second method control H bridges；Or
When the time of the H bridges being controlled to reach Ty using the second method, the H bridges are carried out using the first method Control, until reaching Tx using the time of the first method control H bridges.
4. 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.
5. 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.
6. the control method of the DC-DC converter as described in claim 1 or 5, 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.
7. the control method of the DC-DC converter as described in any one of claim 1-6, which is characterized in that with described first When setting time Tx that mode controls the H bridges is equal to the setting controlled the H bridges with the second method Between Ty, the setting time Ti controlled with the Third Way to the H bridges be equal to the fourth way to the H bridges into The setting time Tm of row control.
8. 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 obtain the DC-DC Converter uses each working cycles in the course of work that the control mode of the phase shift modulation carries out interior with the first method It controls the setting time Tx of the H bridges and the setting time Ty of the H bridges is controlled and by judging with the second method The relationship between total time TA and the total time TB is stated to be controlled when the DC-DC converter being selected to start to the H bridges The mode of system, and alternately control carries out the H bridges according to the setting time Tx and the setting time Ty, with to described the One switching tube, second switch pipe, third switching tube and the 4th switching tube carry out temperature equalization control, wherein, with the first party When formula controls the H bridges, using first bridge arm as leading-bridge, and using second bridge arm as lagging leg；With institute When stating the second method control 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, the control module is obtained with the Three modes are controlled the setting time Ti of the H bridges and the setting time Tm of the H bridges are controlled with fourth way, and set according to described The time Ti and setting time Tm is put the H bridges are carried out alternately to control with to the first switch pipe, second switch pipe, the Three switching tubes and the 4th switching tube carry out temperature equalization control, wherein, when controlling the H bridges with the Third Way, by described in First switch pipe and the third switching tube are as upper tube and using the second switch pipe and the 4th switching tube as under Pipe, and the first switch pipe to the 4th switching tube is controlled using the control mode of down tube modulation；With described When four modes control the H bridges, opened using the first switch pipe and the third switching tube as down tube and by described second 4th switching tube described in Guan Guanhe as upper tube, and using down tube modulation control mode to the first switch pipe to described the Four switching tubes are controlled.
9. DC-DC converter as claimed in claim 8, which is characterized in that the control module according to the total time TA with During the mode controlled when relationship between the total time TB selects the DC-DC converter to start to the H bridges, In,
When the total time TA is more than the total time TB, the control module is selected when the DC-DC converter starts The second method controls the H bridges, until the total time TA is equal to the total time TB；
When the total time TA is less than the total time TB, the control module is selected when the DC-DC converter starts The first method controls the H bridges, until the total time TA is equal to the total time TB；
When the total time TA is equal to the total time TB, the control module is selected when the DC-DC converter starts The first method or the second method according to Tx and Ty to carry out the H bridges alternately control.
10. DC-DC converter as claimed in claim 8 or 9, which is characterized in that when the control module is according to the setting Between Tx and it is described setting time Ty to the H bridges carry out alternately control when, wherein,
When the time of the H bridges being controlled to reach Tx using the first method, the control module uses the second method The H bridges are controlled, until the time for controlling the H bridges using the second method reaches Ty；Or
When the time of the H bridges being controlled to reach Ty using the second method, the control module uses the first method The H bridges are controlled, until the time for controlling the H bridges using the first method reaches Tx.
11. DC-DC converter as claimed in claim 8 or 9, 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.
12. DC-DC converter as claimed in claim 8, 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.
13. the DC-DC converter as described in claim 8 or 12, 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.
14. the DC-DC converter as described in any one of claim 8-13, which is characterized in that with the first method to institute Stating setting time Tx that H bridges are controlled is equal to the setting time Ty controlled with the second method the H bridges, with institute Stating setting time Ti that Third Way controls the H bridges is equal to the H bridges are controlled with the fourth way Time Tm is set.
15. a kind of electric vehicle, which is characterized in that including the DC-DC converter as described in any one of claim 8-14.
CN201611111281.3A 2016-12-02 2016-12-02 The control method of electric car and its DC-DC converter and DC-DC converter Active CN108155809B (en)

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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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CN102611348A (en) * 2012-03-21 2012-07-25 福州大学 Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit
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