CN106992676A - A kind of high-freedom degree DC/DC converters of automatic current equalizing - Google Patents
A kind of high-freedom degree DC/DC converters of automatic current equalizing Download PDFInfo
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- CN106992676A CN106992676A CN201710392053.6A CN201710392053A CN106992676A CN 106992676 A CN106992676 A CN 106992676A CN 201710392053 A CN201710392053 A CN 201710392053A CN 106992676 A CN106992676 A CN 106992676A
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The present invention provides a kind of automatic current equalizing high-freedom degree DC/DC converters, compared to existing converter, it inputs the number of phases and gain unit number is adjustable, and can realize automatic current equalizing after the conversion input number of phases and gain unit number, eliminates the control strategy design of control and the complication of big quantity sensor.During applied to different occasions, can the flexible modulation input number of phases and gain unit number, several times gain can be improved by often increasing an input number of phases or a gain unit number, and the ratio of its output voltage and input voltage is m n, whereinDFor dutycycle, m, n are respectively the input number of phases and gain unit number.Large-scale high-power high-gain occasion can be met.Compared with existing high-gain technology, coupling inductance is not present, in the absence of isolating transformer in the present invention, and the current stress and voltage stress of switch and diode are also reduced, and improve the whole work efficiency of converter.
Description
Technical field
The present invention relates to a kind of DC-DC converter, the high-freedom degree DC/DC of specifically a kind of automatic current equalizing is converted
Device.
Background technology
In the prior art, the research on the DC/DC converters applied to large-capacity high-power transmission system application scenario
It is less, and be mostly isolated converter, the quasi-converter is real typically by the way of intermediate isolating transformer turn ratio is changed
Existing high-gain, the control strategy that thus can be brought is complicated, and the shortcomings of energy transmission efficiency is not high makes it in offshore wind farm etc.
It is restricted in application scenario, and high frequency transformer also takes up an area the shortcomings of volume is big, cost of investment is high in the presence of heavy, because
This is light simple in the urgent need to one kind, while the Large Copacity DC/DC converters of high-gain can be realized.At present, ground for this problem
The converter studied carefully mainly has three kinds：The first, is by resonance to realize high-gain using switched resonance electric capacity, while reducing power
The voltage stress of device, but this method is complicated, and required device is more.Second, be that high increasing is realized using coupling inductance
Benefit, but to not only result in switching device voltage stress too high for the use of coupling inductance, and magnetic disturbance can be caused, add conversion
The working loss of device.Meanwhile, also there is the problem of input number of phases extension difficulty is big when realizing high-gain in such scheme, particularly
It is big that difficulty is flowed between each phase input current.The third, is modular multilevel technology, real by the connection in series-parallel between submodule
Existing high-gain, its high modularization structure can realize Redundant Control, and strengthening system reliability is high, but the quasi-converter is usually required
Add complicated control strategy.
The content of the invention
For deficiencies of the prior art, it is equal to there is control strategy complicated difficult in the existing converter of present invention solution
Stream, the input number of phases is non-adjustable, and device is excessive, power switch and excessive, the energy conversion efficiency reduction of diode voltage stress etc. are asked
There is provided a kind of high-freedom degree DC/DC converters of automatic current equalizing for topic.Its high-freedom degree shows that the converter can be according to no
Application scenario, the different input number of phases of adjustment and gain unit number, the feature of its automatic current equalizing save large amount of complex control plan
Design slightly.
The technical scheme that the present invention takes is：
A kind of high-freedom degree DC/DC converters of automatic current equalizing, the converter includes the m input number of phases, n gain list
Member, m power switch S1、S2...Sm, m inductance L1、L2...Lm, mn electric capacity Co、C11、C21、C31...Cmn, mn two
Pole pipe Do、D11、D21、D31...Dmn；
In the m input numbers of phases,
First inductance L in first phase1Input termination power positive pole, output termination capacitor C1(n-1)One end, first
Inductance L1With electric capacity C1(n-1)Node and input power negative pole indirect first power switch S1, the first power switch S1Source electrode
Connect the negative pole of input power, the first power switch S1Drain electrode and the first inductance L1With electric capacity C1(n-1)Node be connected；
Second inductance L in second phase2Input termination power positive pole, output termination capacitor C2nOne end, second electricity
Feel L2With electric capacity C2nNode and input power negative pole indirect second power switch S2, the second power switch S2Source electrode connects defeated
Enter the negative pole of power supply, the second power switch S2Drain electrode and the second inductance L2With electric capacity C2nNode be connected；
By that analogy to m phases:
M inductance L in m phasesmInput termination power positive pole, output termination capacitor CmnOne end, in m inductance Lm
With electric capacity CmnNode and input power negative pole indirect m power switch Sm, m power switch SmSource electrode connects input power
Negative pole, m power switch SmDrain electrode and m inductance LmWith electric capacity CmnNode be connected；
In n gain units,
In gain unit n, the first inductance L1Export termination capacitor C1(n-1)One end, the second inductance L2Export termination capacitor
C2nOne end, by that analogy to m inductance LmExport termination capacitor CmnOne end.Diode D2nNegative electrode connect electric capacity C2nIt is another
One end, anode connects electric capacity C1(n-1)One end；Diode D3nNegative electrode connect electric capacity C3nThe other end, anode connects electric capacity C2nIt is another
End, by that analogy to diode DmnNegative electrode connect electric capacity CmnThe other end, anode connects electric capacity C(m-1)nThe other end；
In gain unit n-1, the first inductance L1Export termination capacitor C1(n-1)One end, electric capacity C2nAnother termination capacitor
C2(n-1)One end, the C arrived by that analogymnAnother termination capacitor Cm(n-1)One end.Diode D1(n-1)Negative electrode connect electric capacity
C1(n-1)The other end, anode connects electric capacity CmnThe other end；Diode D2(n-1)Negative electrode connect electric capacity C2(n-1)The other end, anode
Connect electric capacity C1(n-1)The other end, by that analogy to diode Dm(n-1)Negative electrode connect electric capacity Cm(n-1)The other end, anode connects electric capacity
C(m-1)(n-1)The other end.
Gain unit 1 is arrived by that analogy：
In gain unit 1, electric capacity C12Another termination capacitor C11One end, electric capacity C22Another termination capacitor C21One
End, by that analogy to Cm2Another termination capacitor Cm1One end.Diode D11Negative electrode connect electric capacity C11The other end, anode connect
Electric capacity Cm2The other end；Diode D12Negative electrode connect electric capacity C12The other end, anode connects electric capacity C11The other end, by that analogy
To diode Dm1Negative electrode connect electric capacity Cm1The other end, anode connects electric capacity C(m-1)1The other end.
Finally in electric capacity Cm1The other end draw diode D0Anode, diode D0Negative electrode and electric capacity C0With load RL
One end be connected, electric capacity C0With load RLThe other end be connected with the negative pole of input power.
Using staggeredly between one kind input adjustable high-gain DC/DC inverter control methods of the number of phases, adjacent power switch
Control strategy；Switch drive phase differs 180 ° between i.e. per adjacent two-phase.
A kind of automatic current equalizing high-freedom degree DC/DC converters of the present invention, technique effect is as follows：
1st, the present invention realizes that high-gain is exported using the adjustable high-freedom degree DC/DC converters of the number of phases are inputted, and often increases by one defeated
Enter the number of phases or a gain unit number, can improve the ratio of more than several times basic gains in original basis, output voltage and input voltage
It is worth and is：
Wherein D is dutycycle, and m, n are respectively the input number of phases and gain unit number.The converter compared with prior art, no
There is coupling inductance, in the absence of transformer, switch and diode voltage stress are greatly reduced, the converter input number of phases and increasing
Beneficial unit is adjustable, has wide range of applications, and is more suitable for large-scale high-gain occasion.
2nd, the converter can realize automatic current equalizing, the uneven stream existed compared to such other converter, big per phase current
Small uncontrollable, it is necessary to the problems such as increasing multiple sensors and control strategy, the converter is when duty cycle of switching is identical, per mutually electricity
Stream is all equal.
3rd, on the one hand the high-freedom degree of the converter shows the regulation to the converter current stress, and it can be according to not
Application scenario, adjusts the different input numbers of phases, and high input current is shared so as to effectively reduction by increasing the input number of phases
The current stress of component；On the other hand the regulation to the converter voltage stress is shown, by changing gain unit number energy
The voltage stress of each component is effectively reduced while high boosting is realized.
Brief description of the drawings
Fig. 1 is circuit theory total figure of the present invention.
Fig. 2 be circuit of the present invention contain 4 mutually input 2 gain units of the number of phases when circuit topology figure.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Fig. 2 a kind of gain unit DC/DC converters of 4 phase of automatic current equalizing 2, it includes 3 input phases, 3 gains
Unit, 3 power switch S1、S2、S3、S4, 4 inductance L1、L2、L3、L4, 8 electric capacity C0、C11、C21、C31、C41、C22、C32、C42
Wherein, 12 diode D0、D11、D21、D31、D41、D22、D23、D24；Wherein：In 4 input numbers of phases,
First inductance L in first phase1Input termination power positive pole, output termination capacitor C11One end, first electricity
Feel L1With electric capacity C11Node and input power negative pole indirect first power switch S1, the first power switch S1Source electrode connects defeated
Enter the negative pole of power supply, the first power switch S1Drain electrode and the first inductance L1With electric capacity C11Node be connected.
Second inductance L in second phase2Input termination power positive pole, output termination capacitor C22One end, second electricity
Feel L2With electric capacity C22Node and input power negative pole indirect second power switch S2, the second power switch S2Source electrode connects defeated
Enter the negative pole of power supply, the second power switch S2Drain electrode and the second inductance L2With electric capacity C22Node be connected.
3rd inductance L in third phase3Input termination power positive pole, output termination capacitor C23One end, the 3rd electricity
Feel L3With electric capacity C23Node and input power negative pole indirect 3rd power switch S3, the 3rd power switch S3Source electrode connects defeated
Enter the negative pole of power supply, the 3rd power switch S3Drain electrode and the 3rd inductance L3With electric capacity C23Node be connected.
4th inductance L in 4th phase4Input termination power positive pole, output termination capacitor C24One end, the 4th electricity
Feel L4With electric capacity C24Node and input power negative pole indirect 4th power switch S4, the 4th power switch S4Source electrode connects defeated
Enter the negative pole of power supply, the 4th power switch S4Drain electrode and the 4th inductance L4With electric capacity C24Node be connected.
In n gain units,
In gain unit 2, the first inductance L1Export termination capacitor C11One end, the second inductance L2Export termination capacitor C22's
One end, the 3rd inductance L3Export termination capacitor C32One end, the 4th inductance L4Export termination capacitor C42One end.Diode D22's
Negative electrode connects electric capacity C22The other end, anode connects electric capacity C11One end；Diode D32Negative electrode connect electric capacity C32The other end, anode
Connect electric capacity C22The other end, diode D42Negative electrode connect electric capacity C42The other end, anode connects electric capacity C32The other end.
In gain unit 1, the first inductance L1Export termination capacitor C11One end, electric capacity C22Another termination capacitor C21's
One end, electric capacity C32Another termination capacitor C31One end, electric capacity C42Another termination capacitor C41One end.Diode D11The moon
Pole connects electric capacity C11The other end, anode connects electric capacity C42The other end；Diode D21Negative electrode connect electric capacity C21The other end, anode
Connect electric capacity C11The other end, diode D31Negative electrode connect electric capacity C31The other end, anode connects electric capacity C21The other end, diode
D24Negative electrode connect electric capacity C24The other end, anode connects electric capacity C13The other end.
Finally in electric capacity C41The other end draw diode D0Anode, diode D0Negative electrode and electric capacity C0With load RL
One end be connected, electric capacity C0With load RLThe other end be connected with the negative pole of input power.
According to the difference of power switch state, circuit can be divided into three kinds of working conditions：
(1), power switch is both turned on, and now input power passes through power switch S1、S2、S3、S4Respectively to inductance L1、L2、
L3、L4Charging；All diodes are turned off.
(2), controller control power switch S1、S3Shut-off, power switch S2、S4Conducting, now low-tension supply passes through inductance
L1, diode D22, switch S2To electric capacity C22Charging, passes through electric capacity C11With diode D21To electric capacity C21Charging, to C11Electric discharge；Together
When low-tension supply pass through inductance L3, electric capacity C32, diode D42, switch S4To electric capacity C42Charging, to C32Electric discharge, passes through electric capacity C31
With diode D41To electric capacity C41Charging, to C31Electric discharge；Now the second power switch S2With the 4th power switch S4It is both turned on, low pressure
Power supply passes through power switch S2、S4To inductance L2、L4Charging；Diode Do、D11、D31、D32It is turned off.
(3), controller control power switch S2、S4Shut-off, power switch S1、S3Conducting, now low-tension supply passes through inductance
L2, electric capacity C22, diode D32, switch S3To electric capacity C32Charging, gives electric capacity C22Electric discharge, passes through electric capacity C21With diode D31To electricity
Hold C31Charging, to C21Electric discharge；Low-tension supply passes through inductance L simultaneously4, electric capacity C42, diode D11, switch S1To electric capacity C11Charging,
To C42Electric discharge, passes through electric capacity C41With diode Do, to C41Electric discharge, to electric capacity CoCharging is simultaneously to load RLPower supply；Now first
Power switch S1With the 3rd power switch S3It is both turned on, low-tension supply passes through power switch S1、S3To inductance L1、L3Charging；Two poles
Pipe D21、D41、D22、D42It is turned off.
By above-mentioned working condition, by electric capacity C42、C32、C22Ampere-second balance be easy to get：
As available from the above equation：
IL1=IL2=IL3=IL4
Pass through above-mentioned analysis, it can be seen that the converter realizes automatic current equalizing, and the paralleling and interleaving control of 180 ° of phase shifts
Mode shares input current by four input inductance, and the electric current that can effectively reduce component while high-gain is realized should
Power.
The above-mentioned embodiment of the present invention is only example to illustrate the invention, and is not the reality to the present invention
Apply the restriction of mode.For those of ordinary skill in the field, other can also be made on the basis of the above description
Various forms of changes and variation.Here all embodiments can not be exhaustive.Every technical side for belonging to the present invention
Case, row of the obvious changes or variations amplified out still in protection scope of the present invention.
Claims (3)
1. a kind of high-freedom degree DC/DC converters of automatic current equalizing, it is characterised in that：The converter includes the m input number of phases, n
Individual gain unit, m power switch S1、S2...Sm, m inductance L1、L2...Lm, mn electric capacity Co、C11、C21、C31...Cmn,
Mn diode Do、D11、D21、D31...Dmn；
In the m input numbers of phases,
First inductance L in first phase1Input termination power positive pole, output termination capacitor C1(n-1)One end, in the first inductance
L1With electric capacity C1(n-1)Node and input power negative pole indirect first power switch S1, the first power switch S1Source electrode connects defeated
Enter the negative pole of power supply, the first power switch S1Drain electrode and the first inductance L1With electric capacity C1(n-1)Node be connected；
Second inductance L in second phase2Input termination power positive pole, output termination capacitor C2nOne end, in the second inductance L2With
Electric capacity C2nNode and input power negative pole indirect second power switch S2, the second power switch S2Source electrode connects input power
Negative pole, the second power switch S2Drain electrode and the second inductance L2With electric capacity C2nNode be connected；
By that analogy to m phases:
M inductance L in m phasesmInput termination power positive pole, output termination capacitor CmnOne end, in m inductance LmAnd electricity
Hold CmnNode and input power negative pole indirect m power switch Sm, m power switch SmSource electrode connects the negative of input power
Pole, m power switch SmDrain electrode and m inductance LmWith electric capacity CmnNode be connected；
In n gain units,
In gain unit n, the first inductance L1Export termination capacitor C1(n-1)One end, the second inductance L2Export termination capacitor C2nOne
End, by that analogy to m inductance LmExport termination capacitor CmnOne end.Diode D2nNegative electrode connect electric capacity C2nThe other end, sun
Pole connects electric capacity C1(n-1)One end；Diode D3nNegative electrode connect electric capacity C3nThe other end, anode connects electric capacity C2nThe other end, with this
It is extrapolated to diode DmnNegative electrode connect electric capacity CmnThe other end, anode connects electric capacity C(m-1)nThe other end；
In gain unit n-1, the first inductance L1Export termination capacitor C1(n-1)One end, electric capacity C2nAnother termination capacitor C2(n-1)
One end, the C arrived by that analogymnAnother termination capacitor Cm(n-1)One end.Diode D1(n-1)Negative electrode connect electric capacity C1(n-1)It is another
One end, anode connects electric capacity CmnThe other end；Diode D2(n-1)Negative electrode connect electric capacity C2(n-1)The other end, anode connects electric capacity
C1(n-1)The other end, by that analogy to diode Dm(n-1)Negative electrode connect electric capacity Cm(n-1)The other end, anode connects electric capacity
C(m-1)(n-1)The other end.
Gain unit 1 is arrived by that analogy：
In gain unit 1, electric capacity C12Another termination capacitor C11One end, electric capacity C22Another termination capacitor C21One end, with
This is extrapolated to Cm2Another termination capacitor Cm1One end.Diode D11Negative electrode connect electric capacity C11The other end, anode connects electric capacity
Cm2The other end；Diode D12Negative electrode connect electric capacity C12The other end, anode connects electric capacity C11The other end, by that analogy to two
Pole pipe Dm1Negative electrode connect electric capacity Cm1The other end, anode connects electric capacity C(m-1)1The other end.
Finally in electric capacity Cm1The other end draw diode D0Anode, diode D0Negative electrode and electric capacity C0With load RLOne
End is connected, electric capacity C0With load RLThe other end be connected with the negative pole of input power.
2. one kind input adjustable high-gain DC/DC inverter control methods of the number of phases, it is characterised in that：Between adjacent power switch
Using Interleaved control strategy；Switch drive phase differs 180 ° between i.e. per adjacent two-phase.
3. using the current equalizing method of DC/DC converters as claimed in claim 1, it is characterised in that：
(1), power switch is both turned on, and now input power passes through power switch S1、S2、S3、S4Respectively to inductance L1、L2、L3、L4
Charging；All diodes are turned off；
(2), controller control power switch S1、S3Shut-off, power switch S2、S4Conducting, now low-tension supply passes through inductance L1, two
Pole pipe D22, switch S2To electric capacity C22Charging, passes through electric capacity C11With diode D21To electric capacity C21Charging, to C11Electric discharge；It is simultaneously low
Voltage source passes through inductance L3, electric capacity C32, diode D42, switch S4To electric capacity C42Charging, to C32Electric discharge, passes through electric capacity C31With two
Pole pipe D41To electric capacity C41Charging, to C31Electric discharge；Now the second power switch S2With the 4th power switch S4It is both turned on, low-tension supply
Pass through power switch S2、S4To inductance L2、L4Charging；Diode Do、D11、D31、D32It is turned off；
(3), controller control power switch S2、S4Shut-off, power switch S1、S3Conducting, now low-tension supply passes through inductance L2, electricity
Hold C22, diode D32, switch S3To electric capacity C32Charging, gives electric capacity C22Electric discharge, passes through electric capacity C21With diode D31To electric capacity C31
Charging, to C21Electric discharge；Low-tension supply passes through inductance L simultaneously4, electric capacity C42, diode D11, switch S1To electric capacity C11Charging, to C42
Electric discharge, passes through electric capacity C41With diode Do, to C41Electric discharge, to electric capacity CoCharging is simultaneously to load RLPower supply；Now the first power
Switch S1With the 3rd power switch S3It is both turned on, low-tension supply passes through power switch S1、S3To inductance L1、L3Charging；Diode D21、
D41、D22、D42It is turned off.
By above-mentioned working condition, by electric capacity C42、C32、C22Ampere-second balance be easy to get：
As available from the above equation：
IL1=IL2=IL3=IL4
Wherein, IL1、IL2、IL3、IL4, respectively represent flow through inductance L1、L2、L3、L4On current average；
Pass through above-mentioned analysis, it can be seen that the converter realizes automatic current equalizing, and the paralleling and interleaving control mode of 180 ° of phase shifts
Input current is shared by four input inductance.
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| CN108880261A (en) * | 2018-06-06 | 2018-11-23 | 三峡大学 | A kind of modularization soft-switching and high-gain DC/DC converter |
| CN108631613B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Modularized high-boost high-capacity isolated rectifying circuit |
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| CN108599581A (en) * | 2018-06-06 | 2018-09-28 | 三峡大学 | A kind of large capacity isolated form DC/DC converters based on multiphase three-level inverter |
| CN108631613A (en) * | 2018-06-06 | 2018-10-09 | 三峡大学 | A kind of modularization height boosting large capacity isolation type rectification circuit |
| CN108696154A (en) * | 2018-06-06 | 2018-10-23 | 三峡大学 | A kind of non-isolation type rectifier of modularization large capacity high-gain |
| CN108696138A (en) * | 2018-06-06 | 2018-10-23 | 宜昌格志科技有限公司 | A kind of modularization large capacity isolated form DC/DC converters |
| CN108599579A (en) * | 2018-06-06 | 2018-09-28 | 三峡大学 | A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number |
| CN108599578A (en) * | 2018-06-06 | 2018-09-28 | 宜昌格志科技有限公司 | A kind of high boosting DC/DC converters of the public clamp circuit of isolated form Modular belts |
| CN108599591B (en) * | 2018-06-06 | 2023-08-25 | 三峡大学 | Self-current-sharing modularized high-capacity high-boost rectifier |
| CN108880260A (en) * | 2018-06-06 | 2018-11-23 | 三峡大学 | A kind of isolated form high-gain DC/DC converter based on bridge-type |
| CN108551262B (en) * | 2018-06-06 | 2023-10-20 | 宜昌格志科技有限公司 | High-gain modularized high-capacity isolated DC/DC converter |
| CN108599579B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Three-level high-boost isolation type DC/DC converter with adjustable bridge arm number |
| CN108880260B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Bridge-based isolated high-gain DC/DC converter |
| CN108880261B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Modularized soft switch high-gain DC/DC converter |
| CN108599581B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | High-capacity isolated DC/DC converter based on multiphase three-level inverter |
| CN108696154B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Modularized high-capacity high-gain non-isolated rectifier |
| CN112425057A (en) * | 2018-07-19 | 2021-02-26 | 三菱电机株式会社 | Power conversion device, motor drive device, and air conditioner |
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Effective date of registration: 20211108 Address after: 430014 c-01-1, daijiashan science and technology entrepreneurship City, No. 888, Hanhuang Road, Jiang'an District, Wuhan City, Hubei Province Patentee after: Wuhan Xinyuan Automatic Control Engineering Co.,Ltd. Address before: 443002 No. 8, University Road, Yichang, Hubei Patentee before: CHINA THREE GORGES University |