CN107104597A - High step-up ratio suspend interlock three level DC/DC converters and its control method - Google Patents
High step-up ratio suspend interlock three level DC/DC converters and its control method Download PDFInfo
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- CN107104597A CN107104597A CN201710388090.XA CN201710388090A CN107104597A CN 107104597 A CN107104597 A CN 107104597A CN 201710388090 A CN201710388090 A CN 201710388090A CN 107104597 A CN107104597 A CN 107104597A
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
-
- 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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Suspended three level DC/DC converters and its control method of interlocking the invention discloses a kind of high step-up ratio, converter includes direct-current input power supplying Uin, the first boost inductance L1, the second boost inductance L2, four switching tube S1、S2、S3、S4, four one-way commutation diode D1、D2、D3、D4, the first output capacitance C1, the second output capacitance C2, the first striding capacitance Cb1With the second striding capacitance Cb2, suspend interlock three-level converter above and below be symmetrical configuration.The present invention has bigger step-up ratio compared with conventional Boost three-level converters in the case of identical dutycycle；The present invention is interlocked with suspending compared with Boost, in the case of same duty cycle, it has the voltage stress of switching tube lower, alternative form can reduce input current ripple, it is adapted to wide input voltage range, switch controlled method is versatile and flexible to wait outstanding advantages, is highly suitable for the regenerative resource grid-connected system such as photovoltaic cell.
Description
Technical field
Suspended three level DC/DC converters and its control method of interlocking the present invention relates to a kind of high step-up ratio, for will be low
Pressure direct current is converted to higher pressure direct current, is generally used for high step-up ratio high efficiency occasion, belongs to electric and electronic technical field.
Technical background
In recent years, solar photovoltaic technology has obtained unprecedented development, and solar photovoltaic grid-connection, which generates electricity, to be turned into
One of major way of Solar use.Research parallel network power generation technology to alleviating energy crisis, preserve the ecological environment and protect
The economic sustainable development of card has far-reaching and great theory and realistic meaning.In general the output of photovoltaic array battery is electric
Pressure is relatively low, it is necessary to the requirement of voltage class needed for could meeting latter stage grid by DC/DC converter boosts.If using
Boost circuit is boosted, when input voltage is relatively low, in order to reach higher output voltage, and its switch conduction dutycycle is just
Can be larger, the efficiency of converter on the one hand so can be reduced, Simultaneous Switching frequency can not be improved further.In order to realize high electricity
Gain is pressed, whole system efficiency is improved, converter must have high-gain, efficient feature.Therefore photovoltaic array needs logical
Cross what a kind of level DC/DC converters of high step-up ratio three needed relatively low photovoltaic array output voltage lifting to rear class inverter
DC bus-bar voltage grade.In addition, the service life in order to extend photovoltaic cell, the input current line of prime DC/DC converters
Ripple is as far as possible small, therefore works out a kind of novel high-performance and with the buckling that more rises higher than the DC/DC changes with smaller current ripple
Parallel operation, there is great theory significance and realistic price.
For example, document [1] S.Choi V.G.Agelidis J.Yang1D.Coutellier
P.Marabeas4.Analysis,design and experimental results of a floating-output
interleaved-input boost-derived DC–DC high-gain transformer-less
Suspension interleaved boost described in converter.IEEE Power Electron, 2011, Vol.4, pp.168-180. this articles becomes
Parallel operation structure, is a kind of high-performance booster converter, but exist switching tube bear voltage stress and diode bear voltage should
The problem of power is high (voltage stress is equal to output voltage).
The content of the invention
In order to overcome deficiency of the prior art, it is an object of the invention to propose that a kind of high performance high step-up ratio suspends
Staggeredly three level DC/DC converters and its control method, this converter can improve boosting no-load voltage ratio, change can be effectively reduced again
The voltage stress of parallel operation switching tube, reduces current ripples, increases the power grade of converter applications, improves the efficiency of converter.
This high step-up ratio and high efficiency converter is applicable routine DC/DC converter applications occasions, is also suitable the new energy such as photovoltaic
Source electricity generation system.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions：
A kind of high step-up ratio suspension staggeredly three level DC/DC converters, an including direct-current input power supplying Uin, first boosting
Inductance L1, the second boost inductance L2, four switching tube S1、S2、S3、S4, four one-way commutation diode D1、D2、D3、D4, it is first defeated
Go out electric capacity C1, the second output capacitance C2, the first striding capacitance Cb1With the second striding capacitance Cb2, suspend and interlock on three-level converter
It is symmetrical configuration down；Specifically connected mode is：First boost inductance L1One end and input power UinPositive pole connection, first liter
Voltage inductance L1The other end and first switch pipe S1Colelctor electrode connection, while being connected to the second diode D2Anode, input electricity
Source UinNegative pole and second switch pipe S2Emitter stage connection, while being connected to output capacitance C1One end；Second boost inductance L2
One end and input power UinNegative pole connection, the second boost inductance L2The other end and the 4th switching tube S4Emitter stage connect
Connect, while being connected to the second diode D2Negative electrode, input power UinPositive pole and the 3rd switching tube S3Colelctor electrode connection, together
When be connected to output capacitance C2One end；First switch pipe S1Colelctor electrode be connected respectively to the first boost inductance L1One end and
Second diode D2Anode, first switch pipe S1Emitter stage and second switch pipe S2Colelctor electrode connection, while being connected to the
One striding capacitance Cb1One end, the 4th switching tube S4Colelctor electrode be connected respectively to the 3rd switching tube S3Emitter stage and second fly
Across electric capacity Cb2One end, the 4th switching tube S4Emitter stage be connected respectively to the second boost inductance L2One end and the 3rd diode
D3Negative electrode；First striding capacitance Cb1One end be connected respectively to the first diode D1Anode and the second diode D2Negative electrode,
First striding capacitance Cb1The other end be connected respectively to first switch pipe S1Emitter stage and second switch pipe S2Colelctor electrode,
Two striding capacitance Cb2One end be connected respectively to the 3rd diode D3Anode and the 4th diode D4Negative electrode, second fly across electricity
Hold Cb2The other end be connected respectively to the 3rd switching tube S3Emitter stage and the 4th switching tube S4Colelctor electrode, the first output capacitance
C1One end be connected respectively to the first diode D1Negative electrode and output end positive pole, the first output capacitance C1The other end difference
It is connected to second switch pipe S2Emitter stage and input power negative pole, the second output capacitance C2One end be connected respectively to the 4th
Diode D4Anode and output end negative pole, the second output capacitance C2The other end be connected respectively to the 3rd switching tube S3Collection
The positive pole of electrode and input power.
Four switching tube S1、S2、S3、S4Using IGBT or power MOSFET.
A kind of suspend the interlock control method of three level DC/DC converters of the high step-up ratio is：
The high step-up ratio suspends the four switching tube S of three level DC/DC converters of interlocking2、S3、S1、S4Drive signal
Phase shift pi/2 phase angle, that is, assume second switch pipe S successively2First triggering and conducting, the 3rd switching tube S3The triggering and conducting at 1/4 cycle,
First switch pipe S1The triggering and conducting at 2/4 cycle, the 4th switching tube S4The triggering and conducting at 3/4 cycle；
When dutycycle D changes, suspend the interlock step-up ratio of three level DC/DC converters of the high step-up ratio is that voltage increases
Benefit is：U0/Uin=(1+D)/(1-D), four switching tube S1、S2、S3、S4Conducting dutycycle be all D.
Due to using above-mentioned technical proposal, a kind of high step-up ratio suspension staggeredly three level DC/DC conversion that the present invention is provided
Device, compared with prior art with such beneficial effect：
(1) two bridge arms are all Boost three-level structures above and below the level DC/DC converters of high step-up ratio three of the present invention, be by
Two level of Boost tri- suspend and are cross-linked together, obtain performance very excellent new converter, and advantage is embodied in promotion
Pressure ratio, using the high circuit of power grade；
(2) the characteristics of level DC/DC converters of high step-up ratio three of the present invention have small device voltage stress and efficiency high.This
In invention, four described switching tubes are using power MOSFET or IGBT, four switching tube S2、S3、S1、S4Drive signal according to
, that is, there is the period simultaneously turned off with bridge arm switching tube in secondary phase shift pi/2 phase angle, the voltage stress that switching tube is born is low, quite
In the half that voltage stress is only born with single switching transistor.
The structure of converter described in document [1] can be divided into upper and lower bridge arm, be to be suspended staggeredly to constitute by two Boost, gather around
There are high boosting, efficient advantage.The converter of the present invention is on the basis of the converter that document [1] is proposed, by two Boost
Three-level converter suspends and is cross-linked, and can possess the former advantage, further reduces switching tube stress, reduces output voltage
Current ripples, can also greatly reduce the size of energy-storage travelling wave tube such as filter inductance, filter capacitor, and the dynamic for improving converter is rung
Should, so as to optimize the dynamic property of whole system.
Converter of the present invention due to input and output not altogether, therefore, when prime breaks down, because there is buffer circuit centre
Cushioning effect, late-class circuit will not directly be disturbed.
Compared with conventional Boost three-level converters, the level DC/DC converters of high step-up ratio three of the invention are identical
Dutycycle in the case of have bigger step-up ratio.Compared with Boost of interlocking with suspending, high step-up ratio three of the invention
Level DC/DC converters are in the case of same duty cycle, and it has the voltage stress of switching tube lower, and alternative form can reduce
Input current ripple, is adapted to wide input voltage range, and switch controlled method is versatile and flexible to wait outstanding advantages, is highly suitable for light
The regenerative resource grid-connected systems such as battery are lied prostrate, with preferable application and promotion prospect.
Brief description of the drawings
Fig. 1 is that high step-up ratio of the present invention suspends the integrated circuit schematic diagram of three level DC/DC converters of interlocking；
Fig. 2 is the pulse sequence diagram of four switching tubes of converter；
Fig. 3 is operation mode of the bridge arm in 0 ＜ D≤0.5 on the converter；
Fig. 4 is operation mode of the bridge arm in 0.5 ＜ D≤1 on the converter；
Fig. 5 is the working condition of the converter upper and lower bridge arm under Interleaved control；
Fig. 6 is the simulation waveform of the converter input voltage and output voltage；
Fig. 7 is the simulation waveform that four switching tubes of the converter bear voltage；
Fig. 8 is the simulation waveform of the inductive current of converter two and input current.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Referring to Fig. 1, a kind of high step-up ratio of the invention suspends the three level DC/DC converters that interlock, and is by two Boost tri-
Level converter suspends and is cross-linked.The converter upper and lower bridge arm is symmetrical, and working method is identical, therefore, is illustrating its work side
During formula, bridge arm can be first selected as research object.Upper bridge arm is Boost three-level structures, and it has 0 ＜ D≤0.5 and 0.5
＜ D≤1 two kind working method.
Analyze for convenience, the switch function p of switching tube is defined firstkFor：
Bridge arm is Boost three-level structures on height boosting DC/DC converters, according to first switch pipe S1And second switch
Pipe S2Dutycycle D size can be divided into 0 ＜ D≤0.5, the two ways of 0.5 ＜ D≤1.With first switch pipe S1And second switch
Pipe S2On off state represent the working condition in a cycle, therefore occur four kinds of on off states on a bridge arm altogether.
Fig. 3 is working condition of the level of bridge arm Boost tri- in 0 ＜ D≤0.5 on high booster converter.
(time is DT to operation mode ones)：s1=01, second switch pipe S2Conducting, first switch pipe S1It is not turned on.
Direct-current input power supplying UinTo the first striding capacitance Cb1With the first boost inductance L1Charge simultaneously, the first output capacitance C1
Electric discharge, 2 points of AB voltage UAB=UCb1, the first boost inductance L1Electric current linearly increases, the first boost inductance L1Voltage be Uin-
UCb1, first switch pipe S1Voltage stress be UC1/2。
(time is (0.5-D) T to operation mode twos)：s0=00, first switch pipe S1, second switch pipe S2Do not lead
It is logical.
Direct-current input power supplying UinWith the first boost inductance simultaneously to the first output C1Charging, the first striding capacitance disconnects, UAB
=UC1, the first boost inductance L1Electric current linearly reduces, the first boost inductance L1Voltage be UC1-Uin, first switch pipe S1, second
Switching tube S2Voltage stress all be UC1/2。
(time is DT to operation mode threes)：s2=10, first switch pipe S1Conducting, second switch pipe S2It is not turned on.
Direct-current input power supplying UinWith the first striding capacitance Cb1The first boost inductance L is given jointly1With the first output capacitance C1Fill
Electricity, UAB=UC1-UCb1=UCb1, the first boost inductance L1Electric current linearly increases, the first boost inductance L1Voltage be Uin+UCb1-
UC1, second switch pipe S2Voltage stress is all UC1/2。
(time is (0.5-D) T to operation mode fours)：s0=00, switching tube is not turned on entirely.
Direct-current input power supplying UinWith the first boost inductance L1Simultaneously to the first output capacitance C1Charging, the first striding capacitance Cb1
Disconnect, UAB=UC1, the first boost inductance L1Electric current linearly reduces, the first boost inductance L1Voltage be UC1-Uin, first switch
Pipe S1, second switch pipe S2Voltage stress all be UC1/2。
Fig. 4 is working condition of the level of bridge arm Boost tri- in 0.5 ＜ D≤1 on the high booster converter.
(time is (D-0.5) T to operation mode ones)：s3=11, first switch pipe S1With second switch pipe S2All turn on.
Direct-current input power supplying UinTo the first boost inductance L1Charging, the first striding capacitance Cb1Disconnect, the first output capacitance C1
Electric discharge, UAB=0, the first boost inductance L1Electric current linearly increases, the first boost inductance L1Voltage be Uin, the voltage of switching tube should
Power is zero.
(time is (1-D) T to operation mode twos)：s1=01, second switch pipe S2With the 4th switching tube S4Conducting, first
Switching tube S1With the 3rd switching tube S3It is not turned on.
Direct-current input power supplying UinWith the first boost inductance L1The first striding capacitance C is given jointlyb1Charging, the first output capacitance C1
Electric discharge, UAB=UCb1, the first boost inductance L1Electric current linearly reduces, the first boost inductance L1Voltage be UCb1-Uin, first switch
Pipe S1With the 3rd switching tube S3Voltage stress all be UC1/2。
(time is (0.5-D) T to operation mode threes)：s3=11, switching tube is turned on entirely.
Direct-current input power supplying UinTo the first boost inductance L1Charging, the first striding capacitance Cb1Disconnect, the first output capacitance C1
Electric discharge, UAB=0, the first boost inductance L1Electric current linearly increases, the first boost inductance L1Voltage be direct-current input power supplying Uin, open
The voltage stress for closing pipe is zero.
(time is (1-D) T to operation mode fours)：s2=10, switching tube S1With second switch pipe S2All it is not turned on.
Direct-current input power supplying Uin, the first boost inductance L1With the first striding capacitance Cb1The first striding capacitance C is given jointlyb1Fill
Electricity, UAB=UC1-UCb1=UCb1, the first boost inductance L1Electric current linearly reduces, the first boost inductance L1Voltage be UC1-Uin-
UCb1, second switch pipe S2Voltage stress all be UC1/2。
When dutycycle is more than 0.5, converter only has s1=01, s1=01, s3=11 three kinds of switch mode, no switching molding
State s02 voltages of=00, AB only have UC1/ 2 and 0 two values, when dutycycle is less than 0.5, converter only has s0=00, s1=
01、s2=10 three kinds of switch mode, no switch mode s32 voltages of=11, AB only have UC1/ 2 and UC1Two values, i.e., in difference
Dutycycle under, AB both end voltages only have two values, so as to reduce the high-frequency AC components of inductive drop.
What Fig. 3, Fig. 4 were analyzed is the mode of operation of upper bridge arm, and the present invention is cross-linked due to being suspended using upper and lower bridge arm, is
Reduce output ripple and improve the response speed of system, Interleaved control technology can be used with switch tube.The switch of upper bridge arm
Pipe employs drive signal and interlocked 180 ° of working method, therefore should be interlocked between upper bridge arm and lower bridge arm using drive signal
90 ° of working method.It can be seen from above-mentioned principle Analysis, four kinds of switch mode occur in a bridge arm, therefore use two
Individual bridge arm interlock 90 ° when, 14 kinds of working conditions (without 1100 and 0011) occur altogether, the dutycycle of switching tube is different, right
The working condition answered is also different, by taking the switch function of the switching tube in high boosting DC/DC converter upper and lower bridge arms as an example, gives
The working condition of the converter under each dutycycle, is shown in accompanying drawing 2.
The level DC/DC converters of high step-up ratio three of the present invention use above-mentioned suspension Interleaved control mode.Below using Fig. 4 as
Example shifts the step-up ratio i.e. voltage gain of the converter onto.
In the level D of Boost tri->Under 0.5 mode of operation, when on off state is in operation mode one, three, the first boosting electricity
Feel L1Electric current is linearly increasing.
When on off state is in operation mode two, four, the first boost inductance L1Electric current linearly reduces.
According to the first boost inductance L1Have a net increase of amount of the electric current in a cycle be zero, can obtain：
Uin(D-0.5) 2=[(UCb1-Uin)+(UC1-Uin-UCb1)]·(1-D) (6)
Draw：
Symmetric relation can be obtained：
In one cycle, due under each operation mode, output voltage with input voltage and the first output capacitance
C1, the second output capacitance C2Series connection, therefore have：
U0=UC1+UC2-Uin (11)
Arrangement formula (9) and formula (11), the relation for finally drawing output voltage and input voltage is：
The voltage stress that single switching transistor is born is equal to striding capacitance voltage, therefore has：
Fig. 5~Fig. 8 show the simulation waveform of the high booster converter in Fig. 1, and Fig. 5 is the driving ripple of four switching tubes
Shape, Fig. 6 reflects that the converter realizes input voltage 68V to output voltage 500V high-gain conversion, now, switching tube duty
It is about 0.76 than D, it is to avoid the appearance of limit dutycycle.Fig. 7 illustrates the waveform of the voltage born of four switching tubes, and
The voltage stress born is 140V, far below output voltage 500V.Two inductive current waveforms and input current waveform such as Fig. 8
Shown, input charging and discharging currents are that the superposition of two pulsation inductive current waveforms subtracts output end current again, in known output
Output end current is steady state value under power condition.Therefore, the ripple frequency of the input current after superposition is doubled, input current
Ripple is reduced, then the level DC/DC converters of high step-up ratio three can realize relatively low ripple with less inductance value, can be effective
Reduce the volume of converter.
It was found from experimental waveform, the level DC/DC converters of high step-up ratio three of the invention are avoiding the occurrence of limit dutycycle
In the case of, realize high boost function, and circuital current ripple is small, the voltage stress of device is relatively low, switching tube it is open-minded
It is small with shut-off energy consumption；Consider these aspects, the level DC/DC converters of high step-up ratio three of the invention are converted with conventional boost
Device, compared to all having a clear superiority, is a kind of DC/DC converters of superior performance.
Claims (4)
- The three level DC/DC converters that interlock 1. a kind of high step-up ratio suspends, it is characterised in that：Including a direct-current input power supplying (Uin), the first boost inductance (L1) the second boost inductance (L2) four switching tube (S1、S2、S3、S4), four poles of one-way commutation two Manage (D1、D2、D3、D4), the first output capacitance (C1), the second output capacitance (C2), the first striding capacitance (Cb1) and second fly across electricity Hold (Cb2), suspend interlock three-level converter above and below be symmetrical configuration；Specifically connected mode is：First boost inductance (L1) one End and input power (Uin) positive pole connection, the first boost inductance (L1) the other end and first switch pipe (S1) colelctor electrode connect Connect, while being connected to the second diode (D2) anode, input power (Uin) negative pole and second switch pipe (S2) emitter stage Connection, while being connected to output capacitance (C1) one end；Second boost inductance (L2) one end and input power (Uin) negative pole Connection, the second boost inductance (L2) the other end and the 4th switching tube (S4) emitter stage connection, while being connected to the second diode (D2) negative electrode, input power (Uin) positive pole and the 3rd switching tube (S3) colelctor electrode connection, while being connected to output capacitance (C2) one end；First switch pipe (S1) colelctor electrode be connected respectively to the first boost inductance (L1) one end and the second diode (D2) anode, first switch pipe (S1) emitter stage and second switch pipe (S2) colelctor electrode connection, while be connected to first fly Across electric capacity (Cb1) one end, the 4th switching tube (S4) colelctor electrode be connected respectively to the 3rd switching tube (S3) emitter stage and second Striding capacitance (Cb2) one end, the 4th switching tube (S4) emitter stage be connected respectively to the second boost inductance (L2) one end and Three diode (D3) negative electrode；First striding capacitance (Cb1) one end be connected respectively to the first diode (D1) anode and second Diode (D2) negative electrode, the first striding capacitance (Cb1) the other end be connected respectively to first switch pipe (S1) emitter stage and Two switching tube (S2) colelctor electrode, the second striding capacitance (Cb2) one end be connected respectively to the 3rd diode (D3) anode and Four diode (D4) negative electrode, the second striding capacitance (Cb2) the other end be connected respectively to the 3rd switching tube (S3) emitter stage and 4th switching tube (S4) colelctor electrode, the first output capacitance (C1) one end be connected respectively to the first diode (D1) negative electrode and The positive pole of output end, the first output capacitance (C1) the other end be connected respectively to second switch pipe (S2) emitter stage and input electricity The negative pole in source, the second output capacitance (C2) one end be connected respectively to the 4th diode (D4) anode and output end negative pole, Two output capacitance (C2) the other end be connected respectively to the 3rd switching tube (S3) colelctor electrode and input power positive pole.
- The three level DC/DC converters that interlock 2. a kind of high step-up ratio according to claim 1 suspends, it is characterised in that：Institute State four switching tube (S1、S2、S3、S4) use IGBT.
- The three level DC/DC converters that interlock 3. a kind of high step-up ratio according to claim 1 suspends, it is characterised in that：Institute State four switching tube (S1、S2、S3、S4) using power MOSFET.
- The control method of three level DC/DC converters 4. a kind of high step-up ratio suspension according to claim 1 or 2 or 3 interlocks, It is characterized in that：The content of this method is：The high step-up ratio suspends the four switching tube (S of three level DC/DC converters of interlocking2、S3、S1、S4) drive signal according to Secondary phase shift pi/2 phase angle, i.e. second switch pipe (S2) first triggering and conducting, the 3rd switching tube (S3) triggering and conducting at 1/4 cycle, the One switching tube (S1) triggering and conducting at 2/4 cycle, the 4th switching tube (S4) triggering and conducting at 3/4 cycle；When dutycycle D changes, suspend the interlock step-up ratio of three level DC/DC converters of the high step-up ratio is voltage gain For：U0/Uin=(1+D)/(1-D), four switching tube (S1、S2、S3、S4) conducting dutycycle be all D.
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