CN109450241B - A kind of two-way DC/DC converter of two-stage type and its reverse starting control method - Google Patents
A kind of two-way DC/DC converter of two-stage type and its reverse starting control method Download PDFInfo
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- CN109450241B CN109450241B CN201811375465.XA CN201811375465A CN109450241B CN 109450241 B CN109450241 B CN 109450241B CN 201811375465 A CN201811375465 A CN 201811375465A CN 109450241 B CN109450241 B CN 109450241B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Abstract
This application discloses a kind of two-way DC/DC converter of two-stage type and its reverse starting control methods, the two-way DC/DC converter of the two-stage type includes the prime DC/DC converter of pressure regulation and the rear class controlled resonant converter of isolation, wherein the rear class controlled resonant converter is at least successively cascaded by inversion/rectification unit, resonant transformation unit, rectification/inversion unit.The reverse starting control method includes: to keep prime DC/DC converter and inversion/rectification unit to be in shutdown status when receiving reverse starting instruction, control rectification/inversion unit delay startup；At the end of rectification/inversion unit delay startup, prime DC/DC converter delay startup is controlled, high voltage bus voltage is established；After establishing high voltage bus voltage, control inversion/rectification unit starting makes the two-way DC/DC converter of two-stage type enter reverse operation state.The application avoids reverse starting moment generation intermediate bus bar energy and flows backward.
Description
Technical field
The present invention relates to power electronics field, more specifically to a kind of two-way DC/DC converter of two-stage type and
Its reverse starting control method.
Background technique
Fig. 1 shows a kind of two-way DC/DC converter of typical two-stage type, the prime DC/DC converter 10 including pressure regulation
With the rear class controlled resonant converter 20 of isolation, wherein rear class controlled resonant converter 20 is at least by inversion/rectification unit 2, resonant transformation list
Member 3, rectification/inversion unit 4 successively cascade.
In forward direction work, prime DC/DC converter 10 is by high voltage bus voltage VHBe converted to stable intermediate bus bar electricity
Press VM, VMExported using the inversion of inversion/rectification unit 2, the fixed gain of resonant transformation unit 3 (fixed gain is less than 1),
The synchronous rectification of rectification/inversion unit 4 and be converted into efficient, stable low-voltage bus bar voltage VL.In reverse operation, VLBy
The inversion of rectification/inversion unit 4, the fixed gain (fixed gain is less than 1) of resonant transformation unit 3 output, inversion/rectification unit
2 synchronous rectification is converted into VM, prime DC/DC converter 10 is further according to VMSize, work realizes that constant pressure is defeated in different mode
Out.
But since the fixed gain of the resonant transformation unit 3 in forward direction work is less than 1, so the V in forward direction workM
It is naturally larger than VL；It is switched to reverse operation moment (i.e. reverse starting moment) in forward direction work, due to bus capacitor both end voltage
I.e. busbar voltage cannot be mutated, so V after switchingM、VLTransient voltage is still equal to V before switchingM、VLTransient voltage；But reversed
Start V existing for momentM> VLOperating condition will lead to the reverse irrigation of intermediate bus bar energy, so as to cause resonance current impact, or even directly draw
Play 2 bombing of inversion/rectification unit.
Summary of the invention
In view of this, the present invention provides a kind of two-way DC/DC converter of two-stage type and its reverse starting control method, with
It avoids reverse starting moment that intermediate bus bar energy occurs to flow backward.
A kind of reverse starting control method of the two-way DC/DC converter of two-stage type, the two-way DC/DC converter of two-stage type
The rear class controlled resonant converter of prime DC/DC converter including pressure regulation and isolation, wherein the rear class controlled resonant converter at least by
Inversion/rectification unit, resonant transformation unit, rectification/inversion unit successively cascade；The reverse starting control method packet
It includes:
When receiving reverse starting instruction, the prime DC/DC converter and the inversion/rectification unit is kept to be in
Shutdown status controls the rectification/inversion unit delay startup；
At the end of the rectification/inversion unit delay startup, the prime DC/DC converter delay startup is controlled, is established high
Press busbar voltage；
After establishing high voltage bus voltage, the inversion/rectification unit starting is controlled, the two-way DC/DC of the two-stage type is made
Converter enters reverse operation state.
Optionally, before the control inversion/rectification unit starting, further includes:
Judge whether the load of the two-way DC/DC converter of the two-stage type is in light condition, if it is not, executing the control
The step of inversion/rectification unit starting.
Optionally, whether the load for judging the two-way DC/DC converter of the two-stage type is in light condition, comprising:
Judge whether the sample rate current of preset is less than setting value, if so, determining that the load of the two-way DC/DC converter of two-stage type is in light
Load state.
Optionally, the sample rate current of the preset be high voltage bus electric current, low-voltage bus bar electric current, intermediate bus bar electric current or
Inductive current in the prime DC/DC converter.
A kind of two-way DC/DC converter of two-stage type, including main circuit and control circuit；
The main circuit includes the prime DC/DC converter of pressure regulation and the rear class controlled resonant converter of isolation, wherein after described
Grade controlled resonant converter is at least successively cascaded by inversion/rectification unit, resonant transformation unit, rectification/inversion unit；
The control circuit is used to keep the prime DC/DC converter and described when receiving reverse starting instruction
Inversion/rectification unit is in shutdown status, controls the rectification/inversion unit delay startup；Delay in the rectification/inversion unit and opens
At the end of dynamic, the prime DC/DC converter delay startup is controlled, high voltage bus voltage is established；And establishing high voltage bus electricity
After pressure, the inversion/rectification unit starting is controlled, the two-way DC/DC converter of the two-stage type is made to enter reverse operation state.
Optionally, the control circuit is also used to judge the two-stage type before controlling the inversion/rectification unit starting
Whether the load of two-way DC/DC converter is in light condition, if it is not, controlling the inversion/rectification unit starting.
Optionally, the control circuit is specifically used for judging whether the sample rate current of preset is less than setting value, if so, sentencing
The load of the fixed two-way DC/DC converter of two-stage type is in light condition.
Optionally, the sample rate current of the preset be high voltage bus electric current, low-voltage bus bar electric current, intermediate bus bar electric current or
Inductive current in the prime DC/DC converter.
Optionally, the prime DC/DC converter is using Buck topology, Boost topology or Buck-Boost topology.
Optionally, the resonant transformation unit is using LC resonance transformer topology or LLC resonance transformer topology.
It can be seen from the above technical scheme that the present invention controls inversion/rectification list when receiving reverse starting instruction
First delayed startup, resonant transformation unit output electric current can only flow through the body diode in inversion/rectification unit during delay, due to
The unilateral conduction of body diode is so the intermediate bus bar energy that two-stage type two-way DC/DC converter forward direction accumulates when working cannot
Flow backward onto low-voltage bus bar；And be delayed during this part intermediate bus bar energy by supply high voltage bus on load and make VM
< VL, this part intermediate bus bar energy even will not occur after inversion/rectification unit starting in this way and flow backward to low pressure mother
The case where line, to solve the problems, such as of the existing technology.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of two-way DC/DC transformer configuration schematic diagram of two-stage type disclosed in the prior art；
Fig. 2 is a kind of two-way DC/DC converter reverse starting control method process of two-stage type disclosed by the embodiments of the present invention
Figure；
Fig. 3 is the two-way DC/DC converter reverse starting control method stream of another two-stage type disclosed by the embodiments of the present invention
Cheng Tu；
Fig. 4 is that the two-way DC/DC of a kind of two-stage type disclosed by the embodiments of the present invention converts implement body topological structure schematic diagram；
Fig. 5 is a kind of LC resonance cavity configuration schematic diagram disclosed by the embodiments of the present invention；
Fig. 6 is a kind of LLCC cavity resonator structure signal become at light load by LC resonance chamber disclosed by the embodiments of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Flow backward to avoid the two-way DC/DC converter of two-stage type shown in Fig. 1 that intermediate bus bar energy occurs in reverse starting moment,
The embodiment of the invention discloses a kind of reverse starting control methods of the two-way DC/DC converter of two-stage type, as shown in Figure 2, comprising:
Step S01: when receiving reverse starting instruction, prime DC/DC converter 10 and inversion/rectification unit 2 are kept
In shutdown status, 4 delay startup of rectification/inversion unit is controlled.
Specifically, control 4 delay startup of rectification/inversion unit, exactly controls accounting for for the power tube in rectification/inversion unit 4
Empty ratio is stepped up maximum value, so that the voltage being applied on resonant transformation unit 3 incrementally increases.Why to control
4 delay startup of rectification/inversion unit is the resonance cavity impedance very little due to resonant transformation unit 3, if reverse starting moment applies
Voltage on resonant transformation unit 3 is excessive, very big resonance current can be brought to impact to resonant cavity, so the present embodiment passes through
The voltage being applied on resonant transformation unit 3 when reverse starting is allowed to incrementally increase, to reduce the resonance current of reverse starting moment
Impact.
Step S02: control 10 delay startup of prime DC/DC converter establishes high voltage bus voltage.
Specifically, the present embodiment is why after rectification/4 delay startup of inversion unit, then control prime DC/DC transformation
Device 10 starts, and is after all starting because of are as follows: rectification/inversion unit 4 and prime DC/DC converter 10, by shape between high and low pressure bus
At reverse current access, reverse current flow direction is as shown by the arrows in Figure 1；4 delay startup of rectification/inversion unit starts minute internal function
The duty ratio very little of rate pipe rectifies/inversion list if starting prime DC/DC converter 10 forms reverse current access at this time
Member 4 can export excessive electric current and burn circuit, therefore the duty ratio of the present embodiment power tube in rectification/inversion unit 4 is steady
Be scheduled on maximum duty cycle (namely after 4 delay startup of rectification/inversion unit, the output electric current of rectification/inversion unit 4 at this time
It is relatively small) start to start prime DC/DC converter 10 again.
After 10 delay startup of prime DC/DC converter, high voltage bus voltage is established.High voltage bus voltage is built
It is vertical, it is meant that the two-way DC/DC converter reverse starting of two-stage type is completed.
During two-stage type two-way DC/DC converter reverse starting, due to inversion/rectification unit 2 and inactive, so
Each power tube is in off state in inversion/rectification unit 2, and reverse current can only be by the body two in inversion/rectification unit 2
Pole pipe outflow, it is intermediate female that the unilateral conduction of body diode accumulates two-stage type two-way DC/DC converter forward direction when working
Heat input cannot flow backward onto low-voltage bus bar, and intermediate bus bar energy occurs so as to avoid reverse starting moment and flows backward.
Step S03: control inversion/rectification unit 2 starts, and the two-way DC/DC converter of two-stage type is made to enter reverse operation shape
State.
Specifically, during 10 delay startup of prime DC/DC converter, because foring reverse current access, two-stage
The intermediate bus bar energy that formula two-way DC/DC converter forward direction accumulates when working may be output to the load on high voltage bus, intermediate female
Line voltage VMIt gradually decreases as lower than low-voltage bus bar voltage VL.So after prime DC/DC 10 delay startup of converter, then control
The power tube of inversion/rectification unit 2 processed carries out switch motion, although inversion/rectification unit 2 is no longer one-way conduction electricity at this time
Road, but the intermediate bus bar energy that will not occur to accumulate when the two-way DC/DC converter forward direction of two-stage type works flows backward.
After starting inversion/rectification unit 2, the two-way DC/DC converter of two-stage type enters reverse operation state, in reverse operation
Under state, VLFixed gain (fixed gain is less than 1) output of inversion, resonant transformation unit 3 through over commutation/inversion unit 4,
The synchronous rectification of inversion/rectification unit 2 is converted into VM, prime DC/DC converter 10 is further according to VMSize, work in different moulds
Formula realizes constant voltage output.
As seen from the above description, when receiving reverse starting instruction, control inversion/rectification unit 2 is delayed the present embodiment
Starting, resonant transformation unit 3, which exports electric current, during delay can only flow through the body diode in inversion/rectification unit 2, due to body two
The unilateral conduction of pole pipe is so the intermediate bus bar energy that two-stage type two-way DC/DC converter forward direction accumulates when working cannot flow backward
Onto low-voltage bus bar；And the load supplied on high voltage bus is also made V by this part intermediate bus bar energy during being delayedM<
VL, so even inversion/rectification unit 2 starting after will not there is a situation where this part intermediate bus bar energy to flow backward, from
And it solves the problems, such as of the existing technology.
On the basis of Fig. 2, another the embodiment of the invention also discloses the two-way DC/DC converter of two-stage type is reversely opened
Flowing control method, as shown in Figure 3, comprising:
Step S01: when receiving reverse starting instruction, prime DC/DC converter 10 and inversion/rectification unit 2 are kept
In shutdown status, 4 delay startup of rectification/inversion unit is controlled.
Step S02: control 10 delay startup of prime DC/DC converter establishes high voltage bus voltage.
Step S03: judge whether the load of the two-way DC/DC converter of two-stage type is in light condition；If so, return step
S03, if it is not, entering step S04；
Specifically, the payload size due to the two-way DC/DC converter of two-stage type is positively correlated with power, watt level is with default
Point electric current (such as the inductance electricity in low-voltage bus bar electric current, high voltage bus electric current, intermediate bus bar electric current, prime DC/DC converter 10
Stream etc.) it is positively correlated, it is possible to judge whether two-way DC/DC converter is in light condition according to size of current, specifically, working as
When the sample rate current of preset is less than setting value, determine that the load of the two-way DC/DC converter of two-stage type is in light condition, and works as
When the sample rate current of preset is not less than the setting value, determine that the load of the two-way DC/DC converter of two-stage type is in heavily loaded shape
State.
Step S04: control inversion/rectification unit 2 starts, and the two-way DC/DC converter of two-stage type is made to enter reverse operation shape
State.
Specifically, inversion/rectification unit 2 reverses current through inversion/rectification list without switch motion at light load
The body diode outflow of member 2；At light load, the turn-on time of body diode is less than rectification/inversion unit 4 in inversion/rectification unit 2
The turn-on time of interior power tube, when in inversion/rectification unit 2 body diode be not turned on and rectify/inversion unit 4 in power tube still
In conducting, resonance current can be to the parasitic capacitance charge/discharge of power tube in inversion/rectification unit 2, in inversion/rectification unit 2
The magnetizing inductance of transformer participates in resonance in the parasitic capacitance and resonant transformation unit 3 of power tube, changes cavity resonator structure
Become, such as being changed by the LC resonance chamber of script is LLCC resonant cavity.
For example: Fig. 4 only with DC/DC converter 10 using Buck-Boost topology, inversion/rectification unit 2 and rectification/
Inversion unit 4 is all made of full-bridge topology, resonant transformation unit 3 using LC resonance transformer topology as an example, C in Fig. 3rWith
LrIt is resonant capacitance and resonant inductance respectively, S5, S6 are the upper and lower power tubes on a bridge arm of inversion/rectification unit 2, S7,
S8 is the upper and lower power tube on another bridge arm of inversion/rectification unit 2.But each function actually in inversion/rectification unit 2
Rate pipe all exists parasitic capacitance (referring to the capacitor of the upper parallel connection of S5~S8 shown in Fig. 5), and the change in resonant transformation unit 3
There are magnetizing inductance L for depressorm(referring to Fig. 5), resonance current iLrTo the parasitic capacitance discharge/charge of power tube in inversion/rectification unit 2
Before electricity, from step down side conversion on high-tension side electric current ipriResonance current i can be split intoLrWith exciting current iLm, wherein
Resonance current iLrCircuit are as follows: Lm→Lr→CrThe body diode of → S5 → intermediate bus bar capacitor CMThe body diode of → S8 is (referring to figure
5), resonant cavity at this time is by CrAnd LrThe LC resonance chamber of composition.And in resonance current iLrTo power in inversion/rectification unit 2
During the parasitic capacitance charge/discharge of pipe, resonance current iLrIt is exactly exciting current iLm, as shown in fig. 6, resonance current iLrCircuit
Become: LmParasitic capacitance → S5 parasitic capacitance → C of → S7r→Lr→LmAnd LmParasitic capacitance → S6 parasitism of → S8
Capacitor → Cr→Lr→LmThis two branches, resonant cavity at this time is by Lr、Lm、Cr, parasitic capacitance constitute LLCC resonant cavity.It can
See, under reverse operation state, the load of the two-way DC/DC converter of two-stage type is at light load, to be become by the LC resonance chamber of script
LLCC resonant cavity.
Resonant cavity gain can change with the change of cavity resonator structure.With bearing for the two-way DC/DC converter of two-stage type
The increase of load, the turn-on time of body diode is gradually restored to and power tube in rectification/inversion unit 4 in inversion/rectification unit 2
Turn-on time it is consistent, cavity resonator structure resonant cavity gain also returns to original state.Starting inversion/rectification list at light load
Member 2, meeting cause inversion/rectification unit 2 to start spread of voltage, also increase prime DC/ since resonant cavity gain is unstable
The dynamic response requirement of DC converter 10, and resonant cavity gain is possible to variation greater than 1, to cause in light load period savings
Between bus energy flow backward, so the present embodiment wouldn't start at light load inversion/rectification unit 2, until by underloading be switched to weight
Restart inversion/rectification unit 2 when load.
As it can be seen that the technical solution of embodiment illustrated in fig. 3 not only avoids compared to the technical solution of embodiment illustrated in fig. 2
Two-stage type two-way DC/DC converter reverse starting moment occurs intermediate bus bar energy and flows backward, it is thus also avoided that the two-way DC/DC of two-stage type
Load when converter reverse operation is that intermediate bus bar energy occurs at light load to flow backward.
Corresponding to the above method embodiment, the embodiment of the invention also discloses a kind of two-way DC/DC transformation of two-stage type
Device, including main circuit and control circuit；
The main circuit includes the prime DC/DC converter of pressure regulation and the rear class controlled resonant converter of isolation, wherein after described
Grade controlled resonant converter is at least successively cascaded by inversion/rectification unit, resonant transformation unit, rectification/inversion unit；
The control circuit is used to keep the prime DC/DC converter and described when receiving reverse starting instruction
Inversion/rectification unit is in shutdown status, controls the rectification/inversion unit delay startup；Delay in the rectification/inversion unit and opens
At the end of dynamic, the prime DC/DC converter delay startup is controlled, high voltage bus voltage is established；And establishing high voltage bus electricity
After pressure, the inversion/rectification unit starting is controlled, the two-way DC/DC converter of the two-stage type is made to enter reverse operation state.
Analysis it is found that the present embodiment be receive reverse starting instruction when, control inversion/rectification unit delayed startup,
And resonant transformation unit output electric current can only flow through the body diode in inversion/rectification unit during being delayed, due to body diode
Unilateral conduction so the intermediate bus bar energy that accumulates of when two-stage type two-way DC/DC converter forward direction work cannot flow backward to low
It presses on bus；And be delayed during this part intermediate bus bar energy by supply high voltage bus on load and make VM< VL, in this way
It will not flow backward there is a situation where this part intermediate bus bar energy to low-voltage bus bar even after inversion/rectification unit starting,
It is of the existing technology to solve the problems, such as.
Optionally, the control circuit is also used to judge the two-stage type before controlling the inversion/rectification unit starting
Whether the load of two-way DC/DC converter is in light condition, if it is not, controlling the inversion/rectification unit starting.At this point, two
The grade two-way DC/DC converter of formula not only avoids reverse starting moment generation intermediate bus bar energy and flows backward, it is thus also avoided that reversed work
Load when making is that intermediate bus bar energy occurs at light load to flow backward.
Optionally, the control circuit is specifically used for judging whether the sample rate current of preset is less than setting value, if so, sentencing
The load of the fixed two-way DC/DC converter of two-stage type is in light condition, if it is not, determining that the two-way DC/DC of the two-stage type becomes
The load of parallel operation is in heavy condition.
Optionally, the sample rate current of the preset be high voltage bus electric current, low-voltage bus bar electric current, intermediate bus bar electric current or
Inductive current in the prime DC/DC converter, does not limit to.
Optionally, the prime DC/DC converter can be using Buck (voltage-dropping type), Boost (booster type) or Buck-
Boost (buck-boost type) topology, does not limit to.
Optionally, the resonant transformation unit can be topological using LC resonance transformer topology or LLC resonance transformer, and
Do not limit to.
Optionally, the inversion/rectification unit, rectification/inversion unit can be all made of full-bridge topology, can also be all made of
Half-bridge topology does not limit to.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For being controlled disclosed in embodiment
For circuit, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method portion
It defends oneself bright.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also including
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence " including one ", it is not excluded that including process, the side of element
There is also other identical elements in method, commodity or equipment.
Professional will be further appreciated that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure and
Algorithm steps can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and soft
The interchangeability of part generally describes each exemplary composition and step according to function in the above description.These function
It can be implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Professional skill
Art personnel can use different methods to achieve the described function each specific application, but this realization should not be recognized
It is beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest scope of features of novelty.
Claims (10)
1. a kind of reverse starting control method of the two-way DC/DC converter of two-stage type, the two-way DC/DC converter packet of two-stage type
The prime DC/DC converter of pressure regulation and the rear class controlled resonant converter of isolation are included, wherein the rear class controlled resonant converter is at least by inverse
Change/rectification unit, resonant transformation unit, rectification/inversion unit successively cascade；The two-way DC/DC converter of two-stage type
In forward direction work, high voltage bus voltage is converted to stable intermediate-bus voltage V by the prime DC/DC converterM, VMAgain
Successively by the inversion of the inversion/rectification unit, the fixed gain of resonant transformation unit output, the rectification/inversion
The synchronous rectification of unit and be converted into low-voltage bus bar voltage VL, wherein the fixed gain is less than 1；In reverse operation, VLSuccessively
By the inversion of the rectification/inversion unit, the fixed gain of resonant transformation unit output, the inversion/rectification unit
Synchronous rectification be converted into VM, the prime DC/DC converter is further according to VMSize, work realizes constant pressure in different mode
Output；Reverse operation, which is switched to, from forward direction work is known as reverse starting；It is characterized in that, the reverse starting control method packet
It includes:
When receiving reverse starting instruction, keeps the prime DC/DC converter and the inversion/rectification unit to be in and shut down
State controls the rectification/inversion unit delay startup；
At the end of the rectification/inversion unit delay startup, the prime DC/DC converter delay startup is controlled, establishes high pressure mother
Line voltage；
After establishing high voltage bus voltage, the inversion/rectification unit starting is controlled, makes the two-way DC/DC transformation of the two-stage type
Device enters reverse operation state.
2. reverse starting control method according to claim 1, which is characterized in that the control inversion/rectification list
Before member starting, further includes:
Judge whether the load of the two-way DC/DC converter of the two-stage type is in light condition, if it is not, executing described in the control
The step of inversion/rectification unit starting.
3. reverse starting control method according to claim 2, which is characterized in that the judgement two-stage type is two-way
Whether the load of DC/DC converter is in light condition, comprising: judge whether the sample rate current of preset is less than setting value, if
It is to determine that the load of the two-way DC/DC converter of two-stage type is in light condition.
4. reverse starting control method according to claim 3, which is characterized in that the sample rate current of the preset is height
Press the inductive current in bus current, low-voltage bus bar electric current, intermediate bus bar electric current or the prime DC/DC converter.
5. a kind of two-way DC/DC converter of two-stage type, including main circuit and control circuit；
The main circuit includes the prime DC/DC converter of pressure regulation and the rear class controlled resonant converter of isolation, wherein the rear class is humorous
Vibration converter is at least successively cascaded by inversion/rectification unit, resonant transformation unit, rectification/inversion unit；The two-stage type
For two-way DC/DC converter in forward direction work, high voltage bus voltage is converted to stable centre by the prime DC/DC converter
Busbar voltage VM, VMSuccessively exported again by the inversion of the inversion/rectification unit, the fixed gain of the resonant transformation unit,
The synchronous rectification of the rectification/inversion unit and be converted into low-voltage bus bar voltage VL, wherein the fixed gain is less than 1；Anti-
To work when, VLSuccessively by the inversion of the rectification/inversion unit, the fixed gain of resonant transformation unit output, institute
It states the synchronous rectification of inversion/rectification unit and is converted into VM, the prime DC/DC converter is further according to VMSize, work in difference
Mode realizes constant voltage output；Reverse operation, which is switched to, from forward direction work is known as reverse starting；
It is characterized in that, the control circuit is used to keep the prime DC/DC converter when receiving reverse starting instruction
It is in shutdown status with the inversion/rectification unit, controls the rectification/inversion unit delay startup；In the rectification/inversion list
At the end of first delay startup, the prime DC/DC converter delay startup is controlled, high voltage bus voltage is established；And establishing high pressure
After busbar voltage, the inversion/rectification unit starting is controlled, the two-way DC/DC converter of the two-stage type is made to enter reverse operation
State.
6. the two-way DC/DC converter of two-stage type according to claim 5, which is characterized in that the control circuit is controlling
Before the inversion/rectification unit starting, it is also used to judge whether the load of the two-way DC/DC converter of the two-stage type is in underloading
State, if it is not, controlling the inversion/rectification unit starting.
7. the two-way DC/DC converter of two-stage type according to claim 6, which is characterized in that the control circuit is specifically used
Whether it is less than setting value in the sample rate current for judging preset, if so, determining the load of the two-way DC/DC converter of the two-stage type
In light condition.
8. the two-way DC/DC converter of two-stage type according to claim 7, which is characterized in that the sampling electricity of the preset
Stream is the inductive current in high voltage bus electric current, low-voltage bus bar electric current, intermediate bus bar electric current or the prime DC/DC converter.
9. the two-way DC/DC converter of two-stage type according to claim 5, which is characterized in that the prime DC/DC converter
Using Buck topology, Boost topology or Buck-Boost topology.
10. the two-way DC/DC converter of two-stage type according to claim 5, which is characterized in that the resonant transformation unit is adopted
With LC resonance transformer topology or LLC resonance transformer topology.
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| CN112260543B (en) * | 2020-09-19 | 2022-06-24 | 许继电源有限公司 | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof |
| CN113572381B (en) * | 2021-07-19 | 2023-03-07 | 平高集团有限公司 | Energy conversion device of micro-grid |
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