CN109921634A

CN109921634A - The control method and device of train and its bidirectional DC-DC converter

Info

Publication number: CN109921634A
Application number: CN201711318586.6A
Authority: CN
Inventors: 邬白贺; 王兴辉; 王超
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2019-06-21
Anticipated expiration: 2037-12-12
Also published as: CN109921634B

Abstract

The invention discloses the control methods and device of a kind of train and its bidirectional DC-DC converter, bidirectional DC-DC converter includes the first transformation branch parallel with one another, the second transformation branch and third transformation branch, every transformation branch includes concatenated switch on the bridge pipe and bridge switch pipe and has a node, spare bridge arm includes concatenated spare switch on the bridge pipe and spare bridge switch pipe and has first node, first node passes through the node that controllable switch is correspondingly connected with every transformation branch respectively, and control method includes: to obtain power to be output；Judge power interval locating for power to be output；Switch on the bridge pipe and bridge switch pipe are controlled according to power interval, when power to be output is less than predetermined power, control transformation branch takes turns to operate；If recognizing any one transformation branch to break down, controls spare bridge arm and take turns to operate instead of the bridge arm in fault conversion branch, the operating time of switching tube can be reduced, extend the life cycle of bidirectional DC-DC converter.

Description

The control method and device of train and its bidirectional DC-DC converter

Technical field

The present invention relates to technical field of vehicle, in particular to a kind of control method of bidirectional DC-DC converter a kind of non-is faced When property computer readable storage medium, a kind of control device of bidirectional DC-DC converter, a kind of bidirectional DC-DC converter and A kind of train.

Background technique

Bidirectional DC-DC converter is always the important component part of field of power electronics, along with the development of vehicular field, DC-DC converter also has become one of important spare part on train.Bidirectional DC-DC converter generallys use three in the related technology Boost topological structure improves the output power of bidirectional DC-DC converter in such a way that three Boost convert branch circuit parallel connection, Three Boost transformation branches divide general power equally in the bidirectional DC-DC converter course of work.Therefore, it is asked existing for the relevant technologies Topic is, no matter the size of target output, three Boost transformation branches all work at the same time, cause circuit element for a long time at In working condition, the working life of switching tube is influenced.

Summary of the invention

The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention First purpose is to propose a kind of control method of bidirectional DC-DC converter, enables to be less than default function in output power Three transformation branches work in turn when rate, and spare bridge arm replaces failure bridge when any one transformation branch breaks down Arm takes turns to operate, and extends the life cycle of bidirectional DC-DC converter.

Second object of the present invention is to propose a kind of non-transitorycomputer readable storage medium.Third of the invention A purpose is to propose a kind of bidirectional DC-DC converter.Fourth object of the present invention is to propose a kind of bidirectional DC-DC converter The control device of device.5th purpose of the invention is to propose a kind of bidirectional DC-DC converter.6th purpose of the invention It is to propose a kind of train.

In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of controlling party of bidirectional DC-DC converter Method, the bidirectional DC-DC converter include that the first transformation branch, the second transformation branch and third convert branch, spare bridge arm, institute State parallel with one another between the first transformation branch, the second transformation branch and third transformation branch, the first transformation branch, the second change The every transformation branch changed in branch and third transformation branch includes switch on the bridge pipe and bridge switch pipe, in every transformation branch Switch on the bridge pipe and the series connection of bridge switch pipe and have node using the node as every transformation branch, the emergency bridge Arm includes spare switch on the bridge pipe and spare bridge switch pipe, the spare switch on the bridge pipe and the series connection of spare bridge switch pipe and With first node, the first node passes through the node that controllable switch is correspondingly connected with every transformation branch, the control respectively Method processed is the following steps are included: obtain the power to be output of the bidirectional DC-DC converter；Judge locating for the power to be output Power interval, wherein the output power of the bidirectional DC-DC converter is divided into multiple power intervals；According to it is described to Power interval locating for output power controls the switch on the bridge pipe and bridge switch pipe, in the power to be output The first transformation branch, the second transformation branch and third transformation branch is controlled when less than predetermined power to take turns to operate；? During the first transformation branch, the second transformation branch and third transformation branch are taken turns to operate, if recognizing institute Any one transformation branch stated in the first transformation branch, the second transformation branch and third transformation branch breaks down, then controls Controllable switch closure between the first node and the node of fault conversion branch, so that the spare bridge arm replaces the event Bridge arm in barrier transformation branch takes turns to operate.

The control method of the bidirectional DC-DC converter proposed according to embodiments of the present invention, wherein bidirectional DC-DC converter Including first transformation branch, second transformation branch and third transformation, spare bridge arm, first transformation branch, second transformation branch and Third converts every transformation parallel with one another between branch, in the first transformation branch, the second transformation branch and third transformation branch Branch includes switch on the bridge pipe and bridge switch pipe, switch on the bridge pipe and the series connection of bridge switch pipe and tool in every transformation branch There is a node using the node as every transformation branch, spare bridge arm includes spare switch on the bridge pipe and spare bridge switch Pipe, spare switch on the bridge pipe and the series connection of spare bridge switch pipe have first node, and first node passes through controllable switch pair respectively Should be connected to the node of every transformation branch, control method by obtaining the power to be output of bidirectional DC-DC converter, judge to Power interval locating for output power, according to power interval locating for power to be output to switch on the bridge pipe and bridge switch pipe into Row control, with the first transformation of control branch, the second transformation branch and third transformation branch when power to be output is less than predetermined power Road takes turns to operate, during first converts branch, the second transformation branch and third transformation branch and is taken turns to operate, If event occurs for any one transformation branch recognized in the first transformation branch, the second transformation branch and third transformation branch Barrier then controls the controllable switch closure between first node and the node of fault conversion branch, so that spare bridge arm replaces failure Bridge arm in transformation branch takes turns to operate.The control method of the embodiment of the present invention can effectively reduce switching tube as a result, Operating time improves the working life of switching tube in transformation branch, sends out in any one transformation branch of bidirectional DC-DC converter When raw failure, accesses spare bridge arm and take turns to operate, and then the life cycle of bidirectional DC-DC converter can be extended.

In order to achieve the above objectives, a kind of non-transitory computer-readable storage medium that second aspect of the present invention embodiment proposes Matter is stored thereon with computer program, and the controlling party of the bidirectional DC-DC converter is realized when which is executed by processor Method.

Non-transitorycomputer readable storage medium according to an embodiment of the present invention, by realizing bidirectional DC-DC converter Control method, can effectively reduce the operating time of switching tube, the working life of switching tube in transformation branch be improved, two-way It when any one transformation branch of DC-DC converter breaks down, accesses spare bridge arm and takes turns to operate, and then can extend double To the life cycle of DC-DC converter.

In order to achieve the above objectives, a kind of bidirectional DC-DC converter that third aspect present invention embodiment proposes, it is described two-way DC-DC converter includes that the first transformation branch, the second transformation branch and third convert branch, the first transformation branch, second Convert parallel with one another between branch and third transformation branch, the first transformation branch, the second transformation branch and third transformation branch Every transformation branch in road includes switch on the bridge pipe and bridge switch pipe, the bidirectional DC-DC converter further include memory, Processor and the control program for being stored in the bidirectional DC-DC converter that can be run on the memory and on the processor, The control of the bidirectional DC-DC converter is realized when the control program of the bidirectional DC-DC converter is executed by the processor Method processed.

Bidirectional DC-DC converter according to an embodiment of the present invention, by realizing the control method of bidirectional DC-DC converter, The operating time of switching tube can be effectively reduced, the working life of switching tube in transformation branch is improved, in bidirectional DC-DC converter Any one transformation branch when breaking down, access spare bridge arm and take turns to operate, and then bidirectional DC-DC converter can be extended The life cycle of device.

In order to achieve the above objectives, a kind of control dress for bidirectional DC-DC converter that fourth aspect present invention embodiment proposes It sets, the bidirectional DC-DC converter includes that the first transformation branch, the second transformation branch and third convert branch, spare bridge arm, institute State parallel with one another between the first transformation branch, the second transformation branch and third transformation branch, the first transformation branch, the second change The every transformation branch changed in branch and third transformation branch includes switch on the bridge pipe and bridge switch pipe, in every transformation branch Switch on the bridge pipe and the series connection of bridge switch pipe and have node using the node as every transformation branch, the emergency bridge Arm includes spare switch on the bridge pipe and spare bridge switch pipe, the spare switch on the bridge pipe and the series connection of spare bridge switch pipe and With first node, the first node passes through the node that controllable switch is correspondingly connected with every transformation branch, the control respectively Device processed includes: acquisition module, for obtaining the power to be output of the bidirectional DC-DC converter；Judgment module, for judging Power interval locating for the power to be output, wherein the output power of the bidirectional DC-DC converter is divided into multiple function Rate section；Control module opens the switch on the bridge pipe and lower bridge for the power interval according to locating for the power to be output It closes pipe to be controlled, to control the first transformation branch, the second transformation branch when the power to be output is less than predetermined power Road and third transformation branch take turns to operate, wherein in the first transformation branch, the second transformation branch and third transformation branch During road is taken turns to operate, if recognizing the first transformation branch, the second transformation branch and third transformation branch In any one transformation branch break down, then control controllable between the first node and the node of fault conversion branch It closes the switch, so that the spare bridge arm replaces the bridge arm in the fault conversion branch to take turns to operate.

The control device of bidirectional DC-DC converter according to an embodiment of the present invention, wherein bidirectional DC-DC converter includes First transformation branch, the second transformation branch and third transformation, spare bridge arm, the first transformation branch, the second transformation branch and third Convert every transformation branch parallel with one another between branch, in the first transformation branch, the second transformation branch and third transformation branch Including switch on the bridge pipe and bridge switch pipe, switch on the bridge pipe and bridge switch pipe in every transformation branch connect and have one For a node using the node as every transformation branch, spare bridge arm includes spare switch on the bridge pipe and spare bridge switch pipe, standby There is first node with switch on the bridge pipe and the series connection of spare bridge switch pipe, first node is correspondingly connected with by controllable switch respectively To the node of every transformation branch, the power to be output that module obtains bidirectional DC-DC converter is obtained, judgment module judges to defeated Power interval locating for power out, control module power interval according to locating for power to be output open switch on the bridge pipe and lower bridge It closes pipe to be controlled, with the first transformation of control branch, the second transformation branch and third when power to be output is less than predetermined power Transformation branch takes turns to operate, and converts what branch, the second transformation branch and third transformation branch took turns to operate first In the process, if recognizing any one transformation branch in the first transformation branch, the second transformation branch and third transformation branch It breaks down, then the controllable switch closure between first node and the node of fault conversion branch is controlled, so that spare bridge arm generation It takes turns to operate for the bridge arm in fault conversion branch.The control device of the embodiment of the present invention can effectively reduce open as a result, The operating time of pipe is closed, the working life of switching tube in transformation branch is improved, in any one transformation of bidirectional DC-DC converter When branch breaks down, accesses spare bridge arm and take turns to operate, and then the life cycle of bidirectional DC-DC converter can be extended.

In order to achieve the above objectives, a kind of bidirectional DC-DC converter that fifth aspect present invention embodiment proposes, including it is described Bidirectional DC-DC converter control device.

Bidirectional DC-DC converter according to an embodiment of the present invention can by the control device of bidirectional DC-DC converter The operating time of switching tube is effectively reduced, the working life of switching tube in transformation branch is improved, in appointing for bidirectional DC-DC converter When transformation branch of anticipating breaks down, accesses spare bridge arm and take turns to operate, and then bidirectional DC-DC converter can be extended Life cycle.

In order to achieve the above objectives, a kind of train that sixth aspect present invention embodiment proposes, including the bi-directional DC-DC Converter.

Train according to an embodiment of the present invention, using bidirectional DC-DC converter, when can effectively reduce the work of switching tube It is long, the working life of switching tube in transformation branch is improved, is broken down in any one transformation branch of bidirectional DC-DC converter When, it accesses spare bridge arm and takes turns to operate, and then the life cycle of bidirectional DC-DC converter can be extended.

Detailed description of the invention

Fig. 1 is the circuit diagram according to the bidirectional DC-DC converter of one embodiment of the invention；

Fig. 2 is the flow chart according to the control method of the bidirectional DC-DC converter of the embodiment of the present invention；

Fig. 3 is the flow chart according to the control method of the bidirectional DC-DC converter of a specific embodiment of the invention；

Fig. 4 is the block diagram according to the control device of the bidirectional DC-DC converter of the embodiment of the present invention；

Fig. 5 is the block diagram according to the bidirectional DC-DC converter of the embodiment of the present invention；

Fig. 6 is the block diagram according to the train of the embodiment of the present invention.

Specific embodiment

The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.

The control method of bidirectional DC-DC converter of it is proposed of the embodiment of the present invention, two-way DC- described with reference to the accompanying drawings Control device, bidirectional DC-DC converter and the train of DC converter.

As shown in Figure 1, bidirectional DC-DC converter according to an embodiment of the invention includes the first transformation branch, second It converts branch and third converts branch, it is parallel with one another between the first transformation branch, the second transformation branch and third transformation branch, the Every transformation branch in one transformation branch, the second transformation branch and third transformation branch includes switch on the bridge pipe and bridge switch Pipe, i.e., first transformation branch include the first switch on the bridge pipe Q11 and the first bridge switch pipe Q12, the first switch on the bridge pipe Q11 and There is second node J2, the second transformation branch includes under the second switch on the bridge pipe Q21 and second among first bridge switch pipe Q1 There is third node J3, third transformation branch among bridge switch pipe Q22, the second switch on the bridge pipe Q21 and the second bridge switch pipe Q22 Road includes third switch on the bridge pipe Q31 and third bridge switch pipe Q32, third switch on the bridge pipe Q31 and third bridge switch pipe There is fourth node J4 among Q32.

Also, as shown in Figure 1, the bidirectional DC-DC converter further includes the first inductance L1, the second inductance L2, third inductance L3 and first capacitor C1, one end of the first inductance L1 are connected with second node J2, one end of the second inductance L2 and third node J3 It is connected, one end of third inductance L3 is connected with fourth node J4, and the other end of third inductance L3 is another with the first inductance L1 simultaneously One end is connected with the other end of the second inductance L2, and first capacitor C1 is connected to the output end of bidirectional DC-DC converter.

Bidirectional DC-DC converter forward direction work when, control the first switch on the bridge pipe Q11, the second switch on the bridge pipe Q21 and Third switch on the bridge pipe Q31 turn-on and turn-off, on controlling the first switch on the bridge pipe Q11, the second switch on the bridge pipe Q21 and third When bridge switch pipe Q31 is connected, the first switch on the bridge pipe Q11, the second switch on the bridge pipe Q21 and third switch on the bridge pipe Q31 difference It charges to the first inductance L1, the second inductance L2 and third inductance L3, controls the first switch on the bridge pipe Q11, the second switch on the bridge pipe When Q21 and third switch on the bridge pipe Q31 is turned off, the first inductance L1, the second inductance L2 and third inductance L3 pass through under first respectively The decompression of the diode continuousing flow of bridge switch pipe Q12, the second bridge switch pipe Q22 and third bridge switch pipe Q32.Conversely, two-way When DC-DC converter reverse operation, the first bridge switch pipe Q12 of control, the second bridge switch pipe Q22 and third bridge switch pipe Q32 turn-on and turn-off are led controlling the first bridge switch pipe Q12, the second bridge switch pipe Q22 and third bridge switch pipe Q32 When logical, the first inductance is given in the first bridge switch pipe Q12, the second bridge switch pipe Q22 and third bridge switch pipe Q32 conducting respectively L1, the second inductance L2 and third inductance L3 charging, control under the first bridge switch pipe Q12, the second bridge switch pipe Q22 and third Bridge switch pipe the first inductance of Q32 L1, the second inductance L2 and third inductance L3 pass through the first switch on the bridge pipe Q11, on second respectively The decompression of the diode continuousing flow of bridge switch pipe Q21 and third switch on the bridge pipe Q31.

The bidirectional DC-DC converter further includes spare bridge arm, under spare bridge arm includes spare switch on the bridge pipe Q41 and is spare Bridge switch pipe Q42, spare switch on the bridge pipe Q41 and spare bridge switch pipe Q42 connect and have first node J1, first node J1 passes through the node that controllable switch is correspondingly connected with every transformation branch, i.e. second node J2, third node J3 and the 4th respectively Node J4.

In an embodiment of the present invention, as shown in Fig. 2, the control method of above-mentioned bidirectional DC-DC converter includes following Step:

S1: the power to be output of bidirectional DC-DC converter is obtained.

S2: judge power interval locating for power to be output, wherein divide the output power of bidirectional DC-DC converter At multiple power intervals.

According to one embodiment of present invention, multiple power intervals are the first power interval, the second power interval and third Power interval, the corresponding power of the second power interval are greater than the corresponding power of the first power interval, and third power interval is corresponding Power is greater than the corresponding power of the second power interval, and the upper limit value of the second power interval is predetermined power.Wherein, predetermined power can For 200kw, specifically, the first power interval can be 0kw-100kw, and the second power interval can be 100kw-200kw, third power Section can be 200kw-300kw.

S3: controlling switch on the bridge pipe and bridge switch pipe according to power interval locating for power to be output, with The first transformation of control branch, the second transformation branch and third transformation branch carry out work in turn when power to be output is less than predetermined power Make.

According to one embodiment of present invention, when power to be output is in the first power interval, to switch on the bridge pipe and Bridge switch pipe is controlled, so that the first transformation branch, the second transformation branch and third transformation branch successively carry out work in turn Make.

It should be noted that when power to be output is in the first power interval, it can be by switch on the bridge pipe and lower bridge Switching tube is controlled, so that the first transformation branch, the second transformation branch and third transformation branch successively take turns to operate.Example Such as, the first switch on the bridge pipe of controllable first transformation branch and the conducting of the first bridge switch pipe in the first transformation branch work Or shutdown, to control the first transformation branch work, the switch on the bridge pipe of the second transformation branch and third transformation branch is under at this time Bridge switch pipe is turned off, the second switch on the bridge pipe of controllable second transformation branch and the when control second converts branch work Two bridge switch pipe on or off, with control the second transformation branch work, the first transformation branch and third convert branch at this time Switch on the bridge pipe and bridge switch pipe be turned off, and control third transformation branch work when, control third transformation road Third switch on the bridge pipe and third bridge switch pipe on or off, with control third controlling brancher work, at this time first become The switch on the bridge pipe and bridge switch pipe for changing branch and the second transformation branch are turned off.Wherein, when control switch on the bridge pipe is under When bridge switch pipe on or off, switch on the bridge pipe on or off can be controlled in forward direction work, be controlled in reverse operation Bridge switch pipe on or off.Specifically, the first transformation branch, the second transformation branch and third transformation branch carry out work respectively Flag bit when making is different, wherein when bidirectional DC-DC converter is every time with the first transformation branch, the second transformation branch and the When the mode that three transformation branches successively take turns to operate is worked, needs when bidirectional DC-DC converter is currently started to work The flag bit of transformation branch when according to last power cut-off is with the first transformation branch → the second transformation branch → third transformation Branch → first transformation branch endless form determines the transformation branch to work first.

That is, judging locating for power to be output after obtaining power to be output when bidirectional DC-DC converter work When the power interval locating for the power to be output is the first power interval, it is last to obtain bidirectional DC-DC converter for power interval The flag bit of transformation branch when power cut-off, and the flag bit of transformation branch when according to last power cut-off determines upper one The transformation branch of task, for example, the transformation mark of settable first power interval is flag1, wherein the first transformation branch Flag bit is a, the flag bit of the second transformation branch is b and the flag bit of third transformation branch is c, i.e., ought get last knot When the flag bit of transformation branch when beam works is a, it is determined that transformation branch when last power cut-off is the first transformation branch When the flag bit on road, the transformation branch when getting last power cut-off is b, it is determined that change when last power cut-off Changing branch is the second transformation branch, when the flag bit of the transformation branch when getting last power cut-off is c, it is determined that on Transformation branch when power cut-off is that third converts branch.

Then, the flag bit of transformation branch when bidirectional DC-DC converter is according to last power cut-off is with the first transformation Branch → the second transformation branch → third transformation branch → first transformation branch endless form determines the change to work first Branch is changed, for example, when the transformation branch when determining last power cut-off is the first transformation branch, it is determined that currently start work The transformation branch of work is the second transformation branch, when the transformation branch when determining last power cut-off is the second transformation branch, Then determine that the transformation branch currently started to work is that third converts branch, the transformation branch when determining last power cut-off is When third converts branch, it is determined that the transformation branch currently started to work is the first transformation branch.

Wherein, bidirectional DC-DC converter is worked for the first time in the first power interval, and the transformation branch to work for the first time is first Branch is converted, every task is in the first power interval with the first transformation branch → the second transformation branch → third transformation later Branch → first transformation branch endless form works.

S4: during first converts branch, the second transformation branch and third transformation branch and is taken turns to operate, if Any one transformation branch recognized in the first transformation branch, the second transformation branch and third transformation branch breaks down, then The controllable switch controlled between first node and the node of fault conversion branch is closed, so that spare bridge arm replaces fault conversion branch Bridge arm in road takes turns to operate.

According to one embodiment of present invention, branch, the second transformation branch and third transformation branch are converted successively first During being taken turns to operate, judge whether the fault flag of to be switched transformation branch is set when switching converts branch Position；If the fault flag set of to be switched transformation branch identifies that be switched transformation branch is fault conversion branch.

Further, when identifying to be switched transformation branch is fault conversion branch, control first node and failure become The controllable switch closure between the node of branch is changed, so that spare bridge arm replaces the bridge arm of fault conversion branch to carry out work in turn Make.

Specifically, converting what branch, the second transformation branch and third transformation branch successively took turns to operate first In the process, judge when switching converts branch to be switched transformation branch fault flag whether set, if to be switched The non-set of fault flag for converting branch, then control to be switched transformation branch and work, if to be switched transformation branch The fault flag set on road then controls the controllable switch between the first node of spare bridge arm and the node of fault conversion branch Closure, spare bridge arm replace fault conversion branch to work.

For example, when recognizing to be switched transformation branch is fault conversion branch, such as the first transformation branch is Fault conversion branch, then the controllable switch controlled between first node and the node of the first transformation branch is closed, thus taking turns to When the first transformation branch work, replaced by the on or off of the switch on the bridge pipe and bridge switch pipe that control spare bridge arm First transformation branch works.

According to one embodiment of present invention, when power to be output is in the second power interval, to switch on the bridge pipe and Bridge switch pipe is controlled so that first transformation branch, second transformation branch and third transformation branch in two-by-two for one group according to It is secondary to take turns to operate.

It should be noted that the first transformation branch and the second transformation branch constitute the first transformation branch group, the first transformation Branch and third transformation branch constitute the second transformation branch group, and the second transformation branch and third transformation branch constitute third and become Change branch group.When power to be output is in the second power interval, by opening the switch on the bridge pipe and lower bridge that convert branch group Close pipe controlled, can make the first transformation branch, second transformation branch and third transformation branch in two-by-two for one group successively into Row takes turns to operate, for example, can control the first switch on the bridge pipe of the first transformation branch when the first transformation branch group is worked The the second switch on the bridge pipe and the second bridge switch pipe on or off of branch are converted, with bridge switch pipe and second to control First transformation branch and the second transformation branch work, the switch on the bridge pipe and bridge switch pipe for controlling third transformation branch at this time close It is disconnected；In the second transformation branch group work, the first switch on the bridge pipe and the first bridge switch pipe of the first transformation branch can control And the third switch on the bridge pipe and third bridge switch pipe on or off of third transformation branch, to control the first transformation branch With third transformation branch work, at this time the switch on the bridge pipe of the second transformation branch and the shutdown of bridge switch pipe；Branch is converted in third When road group works, the second the second switch on the bridge pipe for converting branch and the second bridge switch pipe and third can control to convert branch Third switch on the bridge pipe and third bridge switch pipe on or off, come control the second transformation branch and third transformation branch work Make, at this time the switch on the bridge pipe of the first transformation branch and the shutdown of bridge switch pipe.Wherein, when control switch on the bridge pipe and lower bridge are opened When closing pipe on or off, switch on the bridge pipe on or off can be controlled in forward direction work, bridge under controlling in reverse operation Switching tube on or off.

Specifically, it is successively taken turns for one group two-by-two in the first transformation branch, the second transformation branch and third transformation branch The flag bit flowed when work is different, wherein when bidirectional DC-DC converter is every time with the first transformation branch, the second transformation branch When with being worked two-by-two for one group of mode successively to take turns to operate in third transformation branch, bidirectional DC-DC converter is worked as When preceding start-up operation need according to last power cut-off when that group transformation branch flag bit with first transformation branch and Second transformation branch → first transformation branch and third transformation branch → second transformation branch and third transformation branch → first become The endless form for changing branch and the second transformation branch determines the transformation branch group to work first.

That is, judging locating for power to be output after obtaining power to be output when bidirectional DC-DC converter work When the power interval locating for the power to be output is the second power interval, it is last to obtain bidirectional DC-DC converter for power interval The flag bit of that group transformation branch when power cut-off, and the mark of that group transformation branch when according to last power cut-off Will position determines that group transformation branch of last work, for example, the transformation mark of settable second power interval is flag2, Wherein, the flag bit of the first transformation branch and the second transformation branch is the mark of a ', the first transformation branch and third transformation branch Position be b ', to convert the flag bit of branch be c ' for the second transformation branch and third, i.e., that when getting last power cut-off When the flag bit of one group of transformation branch is a ', it is determined that group transformation branch when last power cut-off is the first transformation branch Road and the second transformation branch, when the flag bit of that group transformation branch when getting last power cut-off is b ', then really That group transformation branch when fixed last time power cut-off is that the first transformation branch and third convert branch, when getting the last time When the flag bit of that group transformation branch when power cut-off is c ', it is determined that group transformation branch when last power cut-off Road is that the second transformation branch and third convert branch.

Then, the flag bit of that group transformation branch when bidirectional DC-DC converter is according to last power cut-off is with One transformation branch and the second transformation branch → first transformation branch and third transformation branch → second transformation branch and third transformation The endless form of branch → first transformation branch and the second transformation branch determines the transformation branch group to work first, for example, When that group transformation branch when determining last power cut-off is the first transformation branch and the second transformation branch, it is determined that when The transformation branch of preceding start-up operation is that the first transformation branch and third convert branch, that when determining last power cut-off When group transformation branch is the first transformation branch and third transformation branch, it is determined that the transformation branch currently started to work becomes for second Change branch and third transformation branch, that group transformation branch when determining last power cut-off is the second transformation branch and the When three transformation branches, it is determined that the transformation branch currently started to work is the first transformation branch and the second transformation branch.

Wherein, bidirectional DC-DC converter is worked for the first time in the second power interval, and the transformation branch to work for the first time is first Convert branch and the second transformation branch, later every time with the first transformation branch and the second transformation branch → first transformation branch and Third converts the circulation side of branch → second transformation branch and third transformation branch → first transformation branch and the second transformation branch Formula works.Specifically, every group of transformation branch divides power to be output equally at work.

According to one embodiment of present invention, it is converted two in branch, the second transformation branch and third transformation branch first During two are successively taken turns to operate for one group, the event of to be switched transformation branch group is judged when switching converts branch group Hinder flag bit whether set；If the fault flag set of to be switched transformation branch group, judges to be switched transformation branch Lu Zuwei fault conversion branch group, and continue to judge next transformation branch group fault flag whether set；If next It is a transformation branch group fault flag set, then judge next transformation branch group for fault conversion branch group, and according to The transformation branch group of switching and next transformation branch group are fault conversion branch group, to identify to be switched transformation branch group It is fault conversion branch with the repeated transformation branch in next transformation branch group；If the failure mark of next transformation branch group The non-set in will position is not then fault conversion branch group according to next transformation branch group, to identify the first transformation branch, second Convert the fault conversion branch in branch and third transformation branch.

That is, if the fault flag set of judgement transformation branch group twice in succession, becomes according to two groups of failures It changes branch group and identifies duplicate transformation branch, and determine that the duplicate transformation branch is fault branch, and then control emergency bridge Controllable switch closure between the first node of arm and the node of fault conversion branch, makes spare bridge arm replace fault conversion branch In bridge arm take turns to operate；If the fault flag set of only to be switched transformation branch group and next transformation is propped up The non-set of transformation branch group of road group is not then that fault conversion branch group identifies fault conversion according to next transformation branch group Branch, and then control the controllable switch between the first node of spare bridge arm and the node of fault conversion branch and be closed, make spare Bridge arm replaces the bridge arm in fault conversion branch to take turns to operate.

For example, when bidirectional DC-DC converter works, judge locating for power to be output after obtaining power to be output Power interval, if power interval locating for power to be output is the second power interval, control the first transformation branch and second Branch work is converted, again with the first transformation branch, the second transformation after DC-DC converter stops or jumps out the second power interval When successively being taken turns to operate for one group two-by-two in branch and third transformation branch, the failure of to be switched transformation branch group is judged Flag bit whether set, i.e., first transformation branch and third transformation branch composition branch group flag bit whether set, if The flag bit set of the branch group of first transformation branch and third transformation branch composition, then judge the event of next transformation branch group Hinder flag bit whether set, i.e., whether the flag bit of branch group for judge that the second transformation branch and third transformation branch form set Position, if the flag bit set of the branch group of the second transformation branch and third transformation branch composition, judges two groups of transformation branches The third transformation branch being overlapped in group is fault conversion branch, and then controls the first node and third transformation branch of spare bridge arm Node between controllable switch closure so that spare bridge arm replace third transformation branch work, that is, control first transformation Branch and spare bridge arm work, if the flag bit of the branch group of the second transformation branch and third transformation branch composition is not set Position, then judge first transformation branch for fault branch, control spare bridge arm first node and first convert branch node it Between controllable switch closure control spare bridge arm and third so that spare bridge arm replaces the first transformation branch to work and become Branch is changed to work.

According to one embodiment of present invention, when power to be output is in third power interval, to switch on the bridge pipe and Bridge switch pipe is controlled, so that the first transformation branch, the second transformation branch and third transformation branch work simultaneously, In, during first converts branch, the second transformation branch and third transformation branch and worked simultaneously, if identification is taken office Transformation branch of anticipating breaks down, then controls the controllable switch closure between first node and the node of fault conversion branch, So that spare bridge arm replaces the bridge arm in fault conversion branch.

That is, when power to be output is greater than predetermined power, the first transformation branch of bidirectional DC-DC converter branch, the Two transformation branches and third transformation branch work simultaneously, wherein the first transformation branch, the second transformation branch and third transformation Branch divides power to be output equally.

Specifically, the first transformation branch, the second change can be controlled simultaneously when power to be output is in third power interval The switch on the bridge pipe and bridge switch pipe on or off of branch and third transformation branch are changed, so that the first transformation branch, second Transformation branch and third transformation branch work simultaneously.For example, can the first transformation of control when DC-DC converter forward direction works The third switch on the bridge of first switch on the bridge pipe of branch, the second switch on the bridge pipe of the second transformation branch and third transformation branch Pipe on or off controls the first bridge switch pipe, the second transformation of the first transformation branch in DC-DC converter reverse operation The bridge switch pipe on or off of the second bridge switch pipe and third the transformation branch of branch.Wherein, first convert branch, During second transformation branch and third transformation branch are worked simultaneously, occur if recognizing any one transformation branch Failure then controls the controllable switch closure between first node and the node of fault conversion branch, so that spare bridge arm replaces event Bridge arm in barrier transformation branch.

A specific embodiment according to the present invention, as shown in figure 3, the control method of above-mentioned bidirectional DC-DC converter The following steps are included:

S101: when bidirectional DC-DC converter starting is started to work.

S102: the power to be output of bidirectional DC-DC converter is obtained.

S103: judge power interval locating for power to be output.

If power interval locating for power to be output is the first power interval, S104 is thened follow the steps；

If power interval locating for power to be output is the second power interval, S109 is thened follow the steps；

If power interval locating for power to be output is third power interval, S115 is thened follow the steps.

S104: the flag bit of transformation branch when last power cut-off is obtained.

S105: to be switched transformation branch is determined.

S106: judge to be switched transformation branch fault flag whether set.

If so, thening follow the steps S107；If not, thening follow the steps S108.

S107: it controls spare bridge arm and the transformation branch with switching is replaced to work.

S108: it controls the transformation branch with switching and works.

S109: the flag bit of that group transformation branch when last power cut-off is obtained.

S110: that be switched group transformation branch is determined.

S111: judge that be switched group transformation branch fault flag whether set.

If so, thening follow the steps S113；If not, thening follow the steps S112.

S112: it controls that be switched group transformation branch and works.

S113: judge it is next transformation branch group fault flag whether set.

S114: determining fault conversion branch, and controls spare bridge arm and work instead of fault conversion branch.

S115: the first transformation branch, the second transformation branch and third transformation branch are determined while being worked.

S116: breaking down if recognizing any one transformation branch, controls spare bridge arm instead of fault conversion branch Bridge arm in road.

In conclusion the control method of the bidirectional DC-DC converter proposed according to embodiments of the present invention, wherein two-way DC- DC converter includes the first transformation branch, the second transformation branch and third transformation, spare bridge arm, and the first transformation branch, second become Change branch and third transformation branch between it is parallel with one another, first transformation branch, second transformation branch and third transformation branch in Every transformation branch includes switch on the bridge pipe and bridge switch pipe, switch on the bridge pipe and bridge switch pipe in every transformation branch It connects and has a node using the node as every transformation branch, under spare bridge arm includes spare switch on the bridge pipe and is spare Bridge switch pipe, spare switch on the bridge pipe and the series connection of spare bridge switch pipe have first node, and first node passes through controllably respectively Switch is correspondingly connected with the node of every transformation branch, and control method passes through the power to be output for obtaining bidirectional DC-DC converter, Judge power interval locating for power to be output, switch on the bridge pipe and lower bridge are opened according to power interval locating for power to be output It closes pipe to be controlled, with the first transformation of control branch, the second transformation branch and third when power to be output is less than predetermined power Transformation branch takes turns to operate, and converts what branch, the second transformation branch and third transformation branch took turns to operate first In the process, if recognizing any one transformation branch in the first transformation branch, the second transformation branch and third transformation branch It breaks down, then the controllable switch closure between first node and the node of fault conversion branch is controlled, so that spare bridge arm generation It takes turns to operate for the bridge arm in fault conversion branch.The control method of the embodiment of the present invention can effectively reduce open as a result, The operating time of pipe is closed, the working life of switching tube in transformation branch is improved, in any one transformation of bidirectional DC-DC converter When branch breaks down, accesses spare bridge arm and take turns to operate, and then the life cycle of bidirectional DC-DC converter can be extended.

The embodiment of the present invention also proposed a kind of non-transitorycomputer readable storage medium, be stored thereon with computer journey Sequence realizes the control method of bidirectional DC-DC converter when the program is executed by processor.

The embodiment of the present invention also proposed a kind of bidirectional DC-DC converter, and bidirectional DC-DC converter includes the first transformation branch Road, the second transformation branch and third convert branch, between the first transformation branch, the second transformation branch and third transformation branch mutually Parallel connection, first transformation branch, second transformation branch and third transformation branch in every transformation branch include switch on the bridge pipe and Bridge switch pipe, bidirectional DC-DC converter further include memory, processor and storage on a memory and can transport on a processor The control program of capable bidirectional DC-DC converter, the control program of bidirectional DC-DC converter are realized two-way when being executed by processor The control method of DC-DC converter.

Fig. 4 is the block diagram according to the control device of the bidirectional DC-DC converter of the embodiment of the present invention.It is described two-way DC-DC converter includes that the first transformation branch, the second transformation branch and third convert branch, spare bridge arm, first transformation It is parallel with one another between branch, the second transformation branch and third transformation branch, the first transformation branch, the second transformation branch and the Every transformation branch in three transformation branches includes switch on the bridge pipe and bridge switch pipe, the switch on the bridge in every transformation branch Pipe and bridge switch pipe connect and have a node using the node as every transformation branch, and the spare bridge arm includes spare Switch on the bridge pipe and spare bridge switch pipe, the spare switch on the bridge pipe and spare bridge switch pipe connect and have first segment Point, the first node pass through the node that controllable switch is correspondingly connected with every transformation branch respectively.

As shown in figure 4, the control device of the bidirectional DC-DC converter of the embodiment of the present invention includes: to obtain module 10, judgement Module 20 and control module 30.

Wherein, the power to be output that module 10 is used to obtain bidirectional DC-DC converter is obtained；Judgment module 20 is for judging Power interval locating for power to be output, wherein the output power of bidirectional DC-DC converter is divided into multiple power intervals； Control module 30 controls switch on the bridge pipe and bridge switch pipe for the power interval according to locating for power to be output, with When power to be output is less than predetermined power, the first transformation of control branch, the second transformation branch and third transformation branch are carried out in turn Work, wherein during first converts branch, the second transformation branch and third transformation branch and is taken turns to operate, if Any one transformation branch recognized in the first transformation branch, the second transformation branch and third transformation branch breaks down, then The controllable switch controlled between first node and the node of fault conversion branch is closed, so that spare bridge arm replaces fault conversion branch Bridge arm in road takes turns to operate.

According to one embodiment of present invention, multiple power intervals are the first power interval, the second power interval and third Power interval, the corresponding power of the second power interval are greater than the corresponding power of the first power interval, and third power interval is corresponding Power is greater than the corresponding power of the second power interval, and the upper limit value of the second power interval is predetermined power, wherein predetermined power can For 200kw, specifically, the first power interval can be 0kw-100kw, and the second power interval can be 100kw-200kw, third power Section can be 200kw-300kw.

Wherein, control module 30 is also used to, when power to be output is in the first power interval, to switch on the bridge pipe under Bridge switch pipe is controlled, so that the first transformation branch, the second transformation branch and third transformation branch successively take turns to operate.

Specifically, flag bit when the first transformation branch, the second transformation branch and third transformation branch are worked respectively It is different, wherein when bidirectional DC-DC converter every time with the first transformation branch, the second transformation branch and third transformation branch according to When the secondary mode to take turns to operate is worked, control module 30 is also used to currently start to work in bidirectional DC-DC converter When transformation branch when needing according to last power cut-off flag bit with the first transformation transformation branch → the of branch → second Three transformation branches → first transformation branch endless form determines the transformation branch to work first.

That is, when bidirectional DC-DC converter work, after acquisition module 10 obtains power to be output, judgment module 20 judge power interval locating for power to be output, when the power interval locating for the power to be output is the first power interval, obtain The flag bit of transformation branch when taking the power cut-off of bidirectional DC-DC converter last time, and when according to last power cut-off The flag bit for converting branch determines the transformation branch of last work, for example, the transformation mark of settable first power interval is Flag1, wherein the flag bit of the first transformation branch is a, the flag bit of the second transformation branch is b and the mark of third transformation branch Will position is c, i.e. when the flag bit of the transformation branch when getting last power cut-off is a, it is determined that the last time terminates work Transformation branch when making is the first transformation branch, when the flag bit of the transformation branch when getting last power cut-off is b, Then determine that transformation branch when last power cut-off is the second transformation branch, the transformation when getting last power cut-off When the flag bit of branch is c, it is determined that transformation branch when last power cut-off is that third converts branch.

Then, the flag bit of transformation branch when bidirectional DC-DC converter is according to last power cut-off is with the first transformation Branch → the second transformation branch → third transformation branch → first transformation branch endless form determines the change to work first Branch is changed, for example, then control module 30 determines when the transformation branch when determining last power cut-off is the first transformation branch The transformation branch currently started to work is the second transformation branch, and the transformation branch when determining last power cut-off becomes for second When changing branch, then control module 30 determines that the transformation branch currently started to work is that third converts branch, when determining last knot When transformation branch when beam works is that third converts branch, then control module 30 determines that the transformation branch currently started to work is the One transformation branch.

According to one embodiment of present invention, control module 30 is also used to, first convert branch, second transformation branch and During third transformation branch is successively taken turns to operate, the event of to be switched transformation branch is judged when switching converts branch Hinder flag bit whether set；If the fault flag set of to be switched transformation branch, identifies to be switched transformation branch For fault conversion branch.

Further, when identifying to be switched transformation branch is fault conversion branch, first node J1 and failure are controlled The controllable switch closure between the node of branch is converted, so that spare bridge arm replaces the bridge arm of fault conversion branch to carry out work in turn Make.

Specifically, converting what branch, the second transformation branch and third transformation branch successively took turns to operate first In the process, judge when switching converts branch to be switched transformation branch fault flag whether set, if to be switched The non-set of fault flag for converting branch, then control to be switched transformation branch and work, if to be switched transformation branch The fault flag set on road then controls controllably opening between the first node J1 of spare bridge arm and the node of fault conversion branch It closes and closes, spare bridge arm replaces fault conversion branch to work.

According to one embodiment of present invention, control module 30 is also used to be in the second power interval when power to be output When, switch on the bridge pipe and bridge switch pipe are controlled, so that the first transformation branch, the second transformation branch and third transformation branch It successively takes turns to operate for one group two-by-two in road.

Specifically, it is successively taken turns for one group two-by-two in the first transformation branch, the second transformation branch and third transformation branch The flag bit flowed when work is different, wherein when bidirectional DC-DC converter is every time with the first transformation branch, the second transformation branch When with being worked two-by-two for one group of mode successively to take turns to operate in third transformation branch, control module 30 is also used to The flag bit of that group transformation branch when needing when bidirectional DC-DC converter is currently started to work according to last power cut-off With the first transformation branch and the second transformation branch → first transformation branch and third transformation branch → second transformation branch and third The endless form of transformation branch → first transformation branch and the second transformation branch determines the transformation branch group to work first.

That is, when bidirectional DC-DC converter work, after acquisition module 10 obtains power to be output, judgment module 20 judge power interval locating for power to be output, when the power interval locating for the power to be output is the second power interval, obtain The flag bit of that group transformation branch when the power cut-off of bidirectional DC-DC converter last time is taken, and work is terminated according to the last time The flag bit of that group transformation branch when making determines that group transformation branch of last work, for example, settable second function The transformation mark in rate section is flag2, wherein the first transformation branch and second converts the flag bit of branch as a ', the first transformation The flag bit of branch and third transformation branch is that the flag bit of b ', the second transformation branch and third transformation branch are c ', i.e., ought obtain When the flag bit for getting that group transformation branch when last power cut-off is a ', then control module 30 determines that the last time terminates That group transformation branch when work is that the first transformation branch and second convert branch, when getting last power cut-off That group transformation branch when the flag bit of that group transformation branch is b ', then when control module 30 determines last power cut-off Branch, the flag bit of that group transformation branch when getting last power cut-off are converted for the first transformation branch and third When for c ', then control module 30 determines that group transformation branch when last power cut-off is that the second transformation branch and third become Change branch.

Then, the flag bit of that group transformation branch when bidirectional DC-DC converter is according to last power cut-off is with One transformation branch and the second transformation branch → first transformation branch and third transformation branch → second transformation branch and third transformation The endless form of branch → first transformation branch and the second transformation branch determines the transformation branch group to work first, for example, When that group transformation branch when determining last power cut-off is the first transformation branch and the second transformation branch, then mould is controlled Block 30 determines that the transformation branch currently started to work converts branch for the first transformation branch and third, when determining last end work When that group transformation branch when making is the first transformation branch and third transformation branch, then control module 30, which determines, currently starts work The transformation branch of work is that the second transformation branch and third convert branch, that group transformation branch when determining last power cut-off When road is the second transformation branch and third transformation branch, then control module 30 determines that the transformation branch currently started to work is first Convert branch and the second transformation branch.

According to one embodiment of present invention, control module 30 is also used to, first convert branch, second transformation branch and During successively being taken turns to operate for one group two-by-two in third transformation branch, judge when switching converts branch group to be switched Transformation branch group fault flag whether set；If the fault flag set of to be switched transformation branch group, sentences The transformation branch group for breaking to be switched is fault conversion branch group, and continues to judge that next fault flag for converting branch group is No set；If the fault flag set of next transformation branch group, judges next transformation branch group for fault conversion Branch group, and be fault conversion branch group according to be switched transformation branch group and next transformation branch group, with identify to Repeated transformation branch in the transformation branch group of switching and next transformation branch group is fault conversion branch；If next change The non-set of fault flag of branch group is changed, then is not fault conversion branch group according to next transformation branch group, to identify Fault conversion branch in first transformation branch, the second transformation branch and third transformation branch.

According to one embodiment of present invention, control module 30 is also used to, and is in third power interval in power to be output When, switch on the bridge pipe and bridge switch pipe are controlled, so that the first transformation branch, the second transformation branch and third transformation branch Road works simultaneously, wherein converts the mistake that branch, the second transformation branch and third transformation branch work simultaneously first Cheng Zhong breaks down if recognizing any one transformation branch, control first node and fault conversion branch node it Between controllable switch closure so that spare bridge arm replace fault conversion branch in bridge arm.

Wherein, three transformation branches divide power to be output equally.

The embodiment of the present invention also proposed a kind of bidirectional DC-DC converter.

Fig. 5 is the block diagram according to the bidirectional DC-DC converter of the embodiment of the present invention.As shown in figure 5, the present invention is real The bidirectional DC-DC converter 200 for applying example includes the control device 100 of bidirectional DC-DC converter.

The embodiment of the present invention also proposed a kind of train.

Fig. 6 is the block diagram according to the train of the embodiment of the present invention.As shown in fig. 6, the train of the embodiment of the present invention 300 include bidirectional DC-DC converter 200.

In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of 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, the meaning of " plurality " is 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 shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with It is that the first and second features directly 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 be directly above or diagonally above the second feature, or be merely representative of First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below " One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and 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 not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims

1. a kind of control method of bidirectional DC-DC converter, which is characterized in that the bidirectional DC-DC converter includes the first change Change branch, the second transformation branch and third transformation branch, spare bridge arm, the first transformation branch, the second transformation branch and the Every change parallel with one another between three transformation branches, in the first transformation branch, the second transformation branch and third transformation branch Changing branch includes switch on the bridge pipe and bridge switch pipe, the switch on the bridge pipe and the series connection of bridge switch pipe in every transformation branch and With a node using the node as every transformation branch, the spare bridge arm includes spare switch on the bridge pipe and spare lower bridge Switching tube, the spare switch on the bridge pipe and spare bridge switch pipe connect and have first node, the first node difference The node of every transformation branch is correspondingly connected with by controllable switch, the control method the following steps are included:

Obtain the power to be output of the bidirectional DC-DC converter；

Judge power interval locating for the power to be output, wherein divide the output power of the bidirectional DC-DC converter At multiple power intervals；

The switch on the bridge pipe and bridge switch pipe are controlled according to power interval locating for the power to be output, with The power to be output be less than predetermined power when control it is described first transformation branch, second transformation branch and third convert branch into Row takes turns to operate；

During the first transformation branch, the second transformation branch and third transformation branch are taken turns to operate, if known Any one transformation branch being clipped in the first transformation branch, the second transformation branch and third transformation branch breaks down, The controllable switch closure between the first node and the node of fault conversion branch is then controlled, so that the spare bridge arm replaces Bridge arm in the fault conversion branch takes turns to operate.

2. the control method of bidirectional DC-DC converter as described in claim 1, which is characterized in that the multiple power interval For the first power interval, the second power interval and third power interval, the corresponding power of second power interval is greater than described The corresponding power of first power interval, the corresponding power of the third power interval are greater than the corresponding function of second power interval Rate, the upper limit value of second power interval are the predetermined power, wherein

When the power to be output is in first power interval, the switch on the bridge pipe and bridge switch pipe are controlled System, so that the first transformation branch, the second transformation branch and third transformation branch successively take turns to operate；

When the power to be output is in second power interval, the switch on the bridge pipe and bridge switch pipe are controlled System, so as to successively carry out work in turn two-by-two in the first transformation branch, the second transformation branch and third transformation branch for one group Make.

3. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that in the first transformation branch Road, second transformation branch and third transformation branch successively taken turns to operate during, switching convert branch when judge to Switching transformation branch fault flag whether set；

If the fault flag set of to be switched transformation branch identifies that the to be switched transformation branch is fault conversion Branch.

4. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that in the first transformation branch During successively being taken turns to operate for one group two-by-two in road, the second transformation branch and third transformation branch, converted in switching Judge when branch group to be switched transformation branch group fault flag whether set；

If the fault flag set of to be switched transformation branch group, judges the to be switched transformation branch group for failure Convert branch group, and continue to judge next transformation branch group fault flag whether set；

If the fault flag set of next transformation branch group, judges next transformation branch group for fault conversion branch Group, and be fault conversion branch group according to the to be switched transformation branch group and next transformation branch group, to identify The repeated transformation branch stated in be switched transformation branch group and next transformation branch group is the fault conversion branch；

If the non-set of fault flag of next transformation branch group, is not fault conversion according to next transformation branch group Branch group, to identify the fault conversion branch in the first transformation branch, the second transformation branch and third transformation branch.

5. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that when the power to be output When in the third power interval, the switch on the bridge pipe and bridge switch pipe are controlled, so that first transformation Branch, the second transformation branch and third transformation branch work simultaneously, wherein

During the first transformation branch, the second transformation branch and third transformation branch are worked simultaneously, if known It is clipped to any one transformation branch to break down, then controls controllable between the first node and the node of fault conversion branch It closes the switch, so that the spare bridge arm replaces the bridge arm in the fault conversion branch.

6. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that the first transformation branch, Flag bit when second transformation branch is worked respectively with third transformation branch is different, wherein when the bidirectional DC-DC converter Device every time by it is described first transformation branch, second transformation branch and third transformation branch successively taken turns to operate in a manner of into Transformation branch when row work, when needing when the bidirectional DC-DC converter is currently started to work according to last power cut-off Flag bit it is true with the first transformation transformation of branch → second branch → third transformation branch → first transformation branch endless form The fixed transformation branch to work first.

7. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that the first transformation branch, Flag bit when successively being taken turns to operate for one group two-by-two in the second transformation branch and third transformation branch is different, wherein when The bidirectional DC-DC converter is converted in branch two-by-two with the first transformation branch, the second transformation branch and third every time When the mode successively to take turns to operate for one group is worked, the needs when bidirectional DC-DC converter is currently started to work The flag bit of that group transformation branch when according to last power cut-off is with the first transformation branch and the second transformation branch → the One transformation branch and third transformation branch → second transformation branch and third transformation branch → first transformation branch and the second transformation The endless form of branch determines the transformation branch group to work first.

8. a kind of non-transitorycomputer readable storage medium, is stored thereon with computer program, which is characterized in that the program quilt The control method such as bidirectional DC-DC converter of any of claims 1-7 is realized when processor executes.

9. a kind of bidirectional DC-DC converter, which is characterized in that the bidirectional DC-DC converter includes the first transformation branch, second Convert branch and third and convert branch, spare bridge arm, the first transformation branch, the second transformation branch and third transformation branch it Between it is parallel with one another, it is described first transformation branch, second transformation branch and third transformation branch in every transformation branch include upper Bridge switch pipe and bridge switch pipe, switch on the bridge pipe and the series connection of bridge switch pipe in every transformation branch and have a node Using the node as every transformation branch, the spare bridge arm includes spare switch on the bridge pipe and spare bridge switch pipe, described Spare switch on the bridge pipe and spare bridge switch pipe connect and have first node, and the first node passes through controllable switch respectively It is correspondingly connected with the node of every transformation branch, the bidirectional DC-DC converter further includes memory, processor and is stored in institute State the control program for the bidirectional DC-DC converter that can be run on memory and on the processor, the bidirectional DC-DC converter Such as bidirectional DC-DC converter of any of claims 1-7 is realized when the control program of device is executed by the processor Control method.

10. a kind of control device of bidirectional DC-DC converter, which is characterized in that the bidirectional DC-DC converter includes the first change Change branch, the second transformation branch and third transformation branch, spare bridge arm, the first transformation branch, the second transformation branch and the Every change parallel with one another between three transformation branches, in the first transformation branch, the second transformation branch and third transformation branch Changing branch includes switch on the bridge pipe and bridge switch pipe, the switch on the bridge pipe and the series connection of bridge switch pipe in every transformation branch and With a node using the node as every transformation branch, the spare bridge arm includes spare switch on the bridge pipe and spare lower bridge Switching tube, the spare switch on the bridge pipe and spare bridge switch pipe connect and have first node, the first node difference The node of every transformation branch is correspondingly connected with by controllable switch, the control device includes:

Module is obtained, for obtaining the power to be output of the bidirectional DC-DC converter；

Judgment module, for judging power interval locating for the power to be output, wherein by the bidirectional DC-DC converter Output power be divided into multiple power intervals；

Control module, for the power interval according to locating for the power to be output to the switch on the bridge pipe and bridge switch pipe Controlled, with the power to be output be less than predetermined power when control it is described first transformation branch, second transformation branch and Third transformation branch takes turns to operate, wherein

11. the control device of bidirectional DC-DC converter as claimed in claim 10, which is characterized in that the multiple power area Between be the first power interval, the second power interval and third power interval, the corresponding power of second power interval is greater than institute State the corresponding power of the first power interval, it is corresponding that the corresponding power of the third power interval is greater than second power interval Power, the upper limit value of second power interval are the predetermined power, wherein the control module is also used to,

12. the control device of bidirectional DC-DC converter as claimed in claim 11, which is characterized in that the control module is also For, during the first transformation branch, the second transformation branch and third transformation branch are successively taken turns to operate, Judge when switching transformation branch to be switched transformation branch fault flag whether set；

13. the control device of bidirectional DC-DC converter as claimed in claim 11, which is characterized in that the control module is also For successively carrying out work in turn two-by-two in the first transformation branch, the second transformation branch and third transformation branch for one group During work, judge when switching converts branch group to be switched transformation branch group fault flag whether set；

14. the control device of bidirectional DC-DC converter as claimed in claim 11, which is characterized in that the control module is also For being carried out to the switch on the bridge pipe and bridge switch pipe when the power to be output is in the third power interval Control, so that the first transformation branch, the second transformation branch and third transformation branch work simultaneously, wherein

15. the control device of bidirectional DC-DC converter as claimed in claim 11, which is characterized in that the first transformation branch Flag bit when road, the second transformation branch are worked respectively with third transformation branch is different, wherein when the bi-directional DC-DC The side that converter is successively taken turns to operate with the first transformation branch, the second transformation branch and third transformation branch every time When formula is worked, the control module is also used to need when the bidirectional DC-DC converter is currently started to work according to upper The flag bit of transformation branch when power cut-off with the first transformation transformation of branch → second branch → third transformation branch → The endless form of first transformation branch determines the transformation branch to work first.

16. the control device of bidirectional DC-DC converter as claimed in claim 11, which is characterized in that the first transformation branch Flag bit when successively being taken turns to operate for one group two-by-two in road, the second transformation branch and third transformation branch is different, wherein When the bidirectional DC-DC converter is every time in the first transformation branch, the second transformation branch and third transformation branch two Two for one group of mode successively to take turns to operate worked when, the control module be also used to the bi-directional DC-DC become The flag bit of that group transformation branch when needing when parallel operation is currently started to work according to last power cut-off is with the first transformation Branch and the second transformation branch → first transformation branch and third transformation branch → second transformation branch and third transformation branch → The endless form of first transformation branch and the second transformation branch determines the transformation branch group to work first.

17. a kind of bidirectional DC-DC converter, which is characterized in that including two-way as described in any one of claim 10-16 The control device of DC-DC converter.

18. a kind of train, which is characterized in that including the bidirectional DC-DC converter as described in claim 9 or 17.