CN104868726B - A kind of three level Boost DC converter of wide gain - Google Patents
A kind of three level Boost DC converter of wide gain Download PDFInfo
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- CN104868726B CN104868726B CN201510263483.9A CN201510263483A CN104868726B CN 104868726 B CN104868726 B CN 104868726B CN 201510263483 A CN201510263483 A CN 201510263483A CN 104868726 B CN104868726 B CN 104868726B
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Abstract
The invention discloses a kind of three level Boost DC converters of wide gain, including：Three level Boost DC converters, which is characterized in that three level Boost DC converter of the wide gain further includes：The tri- end boost networks of LCD being connected with the three level Boosts DC converter；Tri- end boost networks of the LCD are made of inductance, the first polar capacitor and the first diode.The structure not only remains the low advantage of traditional three level Boost DC converter power switch voltage stress, but also has widened voltage gain.When being intended to 0.25, gain constantly increases modulation degree, avoids the problem of causing the extreme duty ratio of power switch to run because increasing gain.Therefore, it is highly suitable for the boosting application scenario of fuel cell electric vehicle.
Description
Technical field
The present invention relates to three level Boost DC converter of DC converter field more particularly to a kind of wide gain, this hairs
The bright application scenario for being related to fuel cell electric vehicle voltage boosting dc converter.
Background technology
With the whole world be faced with petroleum resources exhaustion and environmental pollution Double jeopardy, traditional fuel-engined vehicle (including
Car, van and bus) exhaustion of petroleum resources will be accelerated, aggravate the pollution of environment, it has been no longer appropriate for future society
Demand develops.Therefore, development new-energy automobile have become national governments technology policy formulate be oriented to and China it is big from automobile
State moves towards the only way of automobile power.Fuel cell electric vehicle is because it is high with energy utilization rate, noise is low, no pollution
Advantage, it has also become the important component of new-energy automobile.Hydrogen Energy etc. is generally converted into direct current energy by fuel cell, is electronic
The inverter DC bus side of automobile power-driven system provides electric energy, and then vehicle is driven to advance.But fuel cell exists
The disadvantage that output voltage is low, output characteristics is soft, directly provides it to electric energy for inverter DC bus, on the one hand there is difficulties
The problem of with driving motor voltage matches；On the other hand, when driving motor, which loads, to be increased, the output voltage of fuel cell is anxious
Play declines, and is difficult to maintain the normally travel of electric vehicle.
Therefore, it is connect by voltage boosting dc converter between fuel cell and the inverter of electric vehicle power-driven system
Mouthful, DC bus-bar voltage of the voltage stabilization that fuel cell can be exported needed for inverter, to solve the above problems.
Two traditional level Boost DC converters have the advantages that simple in structure, but apply it to fuel cell
The boosting occasion of electric vehicle DC bus, the problem that power device voltage stress can be brought high, while by circuit parasitic parameter
Influence, actual gain is relatively narrow, and power switch easily operates in extreme duty ratio state, leads to peak current and reduces effect
Rate, or even the risk that causes power switch that cannot effectively turn off.Traditional three level Boost DC converters are by the electricity of power switch
Compression reduces half, but its voltage gain is identical as the gain of two level Boost DC converters, equally also easily there is pole
Hold duty ratio problem.Therefore the voltage gain of voltage boosting dc converter need to be widened, makes that it is suitable for fuel cell electric vehicle liters
It has a meeting, an audience, etc. well under one's control conjunction.
Invention content
The present invention provides a kind of three level Boost DC converters of wide gain, and the present invention is by end boost network and tradition
Three level Boost DC converters the cascade of three ends, constitute a kind of three level Boost DC converter topology of wide gain, will
Fuel cell output voltage stablizes the voltage needed for DC bus by the booster converter, described below：
A kind of three level Boost DC converter of wide gain, including：Three level Boost DC converters, the width gain
Three level Boost DC converters further include：Tri- ends the LCD boosting net being connected with the three level Boosts DC converter
Network；
Tri- end boost networks of the LCD are made of inductance, polar capacitor and the first diode.
Wherein, the inductance carries out energy storage by the first diode and releases energy；The polar capacitor passes through the first diode
Carry out energy storage.
Three level Boost DC converter of the wide gain further includes：Fuel cell, the second diode；
The positive ends of the fuel cell connect the anode of second diode, and the cathode of second diode connects
One end of inductance is connect, the other end of the inductance is separately connected the negative polarity end of the anode of the first diode, polar capacitor, described
The cathode of first diode and the positive polarity of polar capacitor terminate the three level Boosts DC converter.
Wherein, the width gain three-level Boost converter output voltage gain M is
Wherein, Uin、U0Respectively input, output voltage, m is modulation degree.
Wherein, the three level Boosts DC converter includes：The voltage of second polar capacitor, the second polar capacitor is
The voltage of m times of output voltage, the first polar capacitor is lower than the voltage of the second polar capacitor.
The advantageous effect of technical solution provided by the invention is：The present invention passes through three end boost networks are electric with traditional three
The three ends cascade of flat Boost DC converters constitutes three level Boost DC converter topology of new molded breadth gain, and the structure is not
The low advantage of traditional three level Boost DC converter power switch voltage stress is only remained, and has widened voltage gain.
When being intended to 0.25, gain constantly increases modulation degree, avoids and causes the extreme duty ratio fortune of power switch because increasing gain
Capable problem.Therefore, it is highly suitable for the boosting application scenario of fuel cell electric vehicle.
Description of the drawings
Fig. 1 is the circuit diagram for the tri- end boost networks of LCD that the present invention is built；
Fig. 2 is the circuit diagram of traditional three level Boost DC converters；
Fig. 3 is the circuit diagram of three level Boost DC converter of new molded breadth gain provided by the invention；
Fig. 4 is the modulation strategy of topology provided by the invention.
In attached drawing, parts list represented by the reference numerals are as follows：
UinFor fuel cell output voltage, the as input voltage of converter；
DbFor fuel cell current direction blocking diode；
L1、L2Respectively the first, second energy storage inductor；D1、D3、D4Respectively fly-wheel diode；
C1、C2Respectively the first, second polar capacitor (storage capacitor)；
Q1、Q2The respectively power switch of converter；C3、C4The respectively output capacitance of converter；
Cr1、Cr2Respectively carrier phase shift, m are modulation degree, and T is carrier cycle, d1、d2Respectively power switch Q1、Q2Account for
Empty ratio, S1S2For power switch Q1、Q2On off state；
(1) it is tri- end boost networks of LCD；(2) it is three level Boost DC converters.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
It is described in detail on ground.
Embodiment 1
A kind of three level Boost DC converter of wide gain, the three level Boost DC converter of wide gain include：LCD
Three end boost networks and three level Boost DC converters.
Referring to Fig. 1, the tri- end boost networks of LCD are by the first inductance L1, the first polar capacitor C1With the first diode D1Structure
At.First inductance L1Pass through the first diode D1It carries out energy storage and releases energy；First polar capacitor C1Pass through the first diode D1It carries out
Energy storage.
It is three traditional level Boost DC converters, by the second inductance L referring to Fig. 22, the second polar capacitor C2, 2
Diode (D3And D4), 2 capacitance (C3And C4) and 2 power switch (Q1And Q2) composition.The concrete structure of the circuit is ability
Well known to field technique personnel, the embodiment of the present invention repeats no more specific circuit connecting relation.
Referring to Fig. 3, which includes：Fuel cell Uin, the second diode
Db, tri- end boost networks of LCD and three level Boost DC converters, fuel cell UinPositive ends connect the second diode
DbAnode, the second diode DbCathode connection LCD tri- end boost networks (connect the first electricity in tri- end boost networks of LCD
Feel L1One end, the first inductance L1One end as input terminal 1, the first inductance L1The other end be separately connected the first diode D1
Anode, the first polar capacitor C1Negative polarity end, the first diode D1Cathode and the first polar capacitor C1Positive polarity termination
Three level Boost DC converters)；Tri- end boost networks of LCD connect three level Boost DC converters (the first diode D1
Cathode be separately connected the second inductance L2One end, the second polar capacitor C2Positive ends, the second polar capacitor C1Positive polarity
The second inductance L of end connection2The other end, subsequent circuit be connected as three level Boost DC converters inside connection, for this
Well known to field technology personnel, the embodiment of the present invention does not repeat this), fuel cell UinNegative polarity end connect three level
Boost DC converters (fuel cell UinNegative polarity end connect the second polar capacitor C2Negative polarity end, remaining negative polarity end
Connection it is known to those skilled in the art, the embodiment of the present invention does not repeat this).
That is, (the second polar capacitor C of input terminal 1,3 of three level Boost DC converters2Positive ends with second electricity
Feel L2One end be connected as input terminal 1, the second inductance L2The other end as input terminal 3) respectively with tri- end liters of the LCD of Fig. 1
2,3 ends (the first diode D of pressure network network1Cathode as input terminal 2, the first polar capacitor C1Positive ends as input terminal
3) it mutually cascades, fuel cell Uin, the second diode Db(i.e. unidirectional blocking diode) respectively with tri- end boost networks of the LCD of Fig. 1
(the first inductance L of terminal 11One end as input terminal 1) and Fig. 2 three level Boost DC converter of tradition input terminal 2
(the second polar capacitor C2Negative polarity end) be in parallel, to constitute three level Boost DC converting of wide gain as shown in Figure 3
Device topology.And L1=L2、uL1=uL2, C3=C4、UC3=UC4=Uo/2(uL1、uL2For the first inductance L1, the second inductance L2Electricity
Pressure；UC3、UC4For capacitance C3、C4Voltage).
Fig. 4 is the PWM modulation strategy of New Topological, described below：
One, voltage gain
In the stable state of wide gain three-level Boost converter continuous current mode, all capacitance voltages assume its capacity
Sufficiently large, then capacitance voltage is constant, capacitance current zero.As the on off state S of topology1S2=01 or 10 (S1S2It is opened for power
Close Q1、Q2On off state) when, the first inductance L1, the second inductance L2It releases energy, flows through the first inductance L1, the second inductance L2
Electric current it is equal, therefore, the inductive drop to release energy under the on off state is equal, i.e. uL1_dis=uL2_dis, the first polarity electricity
Hold C1, the second polar capacitor C2Equal storage energy.By three voltage closed circuit (S1S2=01)：Uin-Db-L1-D1-L2-D3-C3-
Q2-UinAnd L2-C1-D1-L2And Uin-Db-L1-D1C2-Uin, then obtained by Kirchhoff's first law
U in formulaL1_dis、uL2_disRespectively the first inductance L1, the second inductance L2Voltage when releasing energy, Uin、UoRespectively
Input and output voltage, UC1、UC2Respectively the first polar capacitor C1, the second polar capacitor C2Voltage.
As the on off state S of topology1S2When=11, the first inductance L1, the second inductance L2Energy is stored, the first electricity is flowed through
Feel L1, the second inductance L2Electric current it is equal, therefore, under the on off state store energy inductive drop it is equal, i.e. uL1_ch=
uL2_ch, the first polar capacitor C1, the second polar capacitor C2Release energy.By three voltage closed circuits：Uin-Db-L1-D1-
L2-Q1-Q2-UinAnd Uin-Db-L1-C1-Q1-Q2-UinAlso C2-L2-Q1-Q2-C2, then obtained by Kirchhoff's first law
U in formulaL1_ch、uL2_chRespectively the first inductance L1, the second inductance L2Store voltage when energy.
First inductance L is obtained by formula (1)1, the second inductance L2Voltage when releasing energy is
Because of the second polar capacitor C2Voltage constant, by formula (1), (2)
Uin+uL1_dis=UC2=uL2_ch (4)
It is obtained again by formula (3)
It can be obtained by the modulation strategy of Fig. 4, on off state S1S2Inductance L when=01 or 101Discharge time tdisFor
On off state S1S2Inductance L when=111Charging time tchFor
tch=[d1-(1-d2)]×T (7)
D in above formula1、d2Respectively power switch Q1、Q2Duty ratio, 0.25 m≤0.5 < be modulation degree, T is carrier cycle
Phase.
For each inductance, the energy discharged in each carrier cycle is equal to the energy of storage, therefore by the first electricity
Feel L1Voltage-second balance obtain
uL1_dis×tdis=uL1_ch×tch (8)
Therefore, obtaining wide gain three-level Boost converter output voltage gain M by formula (3), (5), (6)~(8) is
Two, capacitance voltage
The first polar capacitor C is obtained by formula (1), (2)1, the second polar capacitor C2Voltage be
It is obtained by formula (9), (10)
The second polar capacitor C is obtained by formula (9), (11)2Voltage be output voltage m (0.25 m≤0.5 <) times, first
Polar capacitor C1Voltage than the second polar capacitor C2The low U of voltagein.Therefore, the first polar capacitor C1, the second polar capacitor C2
All have lower voltage stress.
Embodiment 2
Below with Fig. 3,4 three level Boost DC converter topology of wide gain and its modulation strategy, to the original of the present invention
Reason and preferred forms are described in detail.In each carrier cycle, three level Boost DC converter of wide gain is undergone altogether
Three on off states.
(1) on off state S1S2When=01, the first inductance L1, the second inductance L2Release energy, the first polar capacitor C1,
Two polar capacitor C2Equal storage energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 1-a, i.e. Uin-Db-L1-D1-L2-D3-C3-Q2-Uin, power supply U at this timeinWith the first inductance L1, second electricity
Feel L2To capacitance C3It charges, and load (inverter DC bus side) is energized, at this time C4Electric discharge；
Closed circuit 1-b, i.e. L2-C1-D1-L2, the second inductance L at this time2Pass through the first diode D1To the first polar capacitor
C1It charges；
Closed circuit 1-c, i.e. Uin-Db-L1-D1C2-Uin, power supply U at this timeinWith the first inductance L1Pass through the second diode Db
With the first diode D1To the second polar capacitor C2It charges.The total time t of on off state experience01=(1-d1)T。
(2) on off state S1S2When=10, the first inductance L1, the second inductance L2Release energy, the first polar capacitor C1,
Two polar capacitor C2Equal storage energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 2-a, i.e. Uin-Db-L1-D1-L2-Q1-C4-D4-Uin, at this point, power supply UinWith the first inductance L1, second electricity
Feel L2To capacitance C4It charges, and load (inverter DC bus side) is energized, at this time C3Electric discharge；
Closed circuit 2-b, i.e. L2-C1-D1-L2, the second inductance L at this time2Pass through the first diode D1To the first polar capacitor
C1It charges；
Closed circuit 2-c, i.e. Uin-Db-L1-D1C2-Uin, power supply U at this timeinWith the second inductance L1Pass through the second diode Db
With the first diode D1To the second polar capacitor C2It charges.The total time t of on off state experience10=(1-d2)T。
(3) on off state S1S2When=11, the first inductance L1, the second inductance L2Equal storage energy, the first polar capacitor C1,
Two polar capacitor C2It releases energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 3-a, i.e. Uin-Db-L1-D1-L2-Q1-Q2-Uin, power supply U at this timeinTo the first inductance L1, the second inductance L2
Store energy；
Closed circuit 3-b, i.e. Uin-Db-L1-C1-Q1-Q2-Uin, power supply U at this timeinWith the first polar capacitor C1To the first electricity
Feel L1Store energy；
Closed circuit 3-c, i.e. C2-L2-Q1-Q2-C2, the second polar capacitor C at this time2To the second inductance L2Store energy.It should
The total time t of on off state experience11=[d1-(1-d2)]T。
Three kinds of on off states in summary, S1S2When=11, UinFor the first inductance L1, the second inductance L2Store energy, UinWith
First polar capacitor C1For the first inductance L1Store energy, the second polar capacitor C2For the second inductance L2Store energy；S1S2=01
Or when 10, the second inductance L2For the first polar capacitor C1Storage energy, UinWith the first inductance L1For the second polar capacitor C2Store energy
Amount, while UinWith the first inductance L1, the second inductance L2Remaining energy provides for outlet side.Therefore, pass through power supply, inductance, electricity
Time-sharing multiplex transmits the energy of appearance in a manner described, achievees the purpose that improve output voltage gain, is highly suitable for fuel cell
The boosting occasion of electric vehicle.
To the model of each device in addition to doing specified otherwise, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, can not represent the quality of embodiment.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of three level Boost DC converter of wide gain, including：Three level Boost DC converters, which is characterized in that
Three level Boost DC converter of the wide gain further includes：The LCD being connected with the three level Boosts DC converter
Three end boost networks；
Tri- end boost networks of the LCD are by the first inductance L1, the first polar capacitor C1With the first diode D1It constitutes；
Three level Boost DC converter of the wide gain further includes：Fuel cell, the second diode Db；
The positive ends of the fuel cell connect the second diode DbAnode, the second diode DbCathode connect
Meet the first inductance L1One end, the first inductance L1The other end be separately connected the first diode D1Anode, the first polarity electricity
Hold C1Negative polarity end, the first diode D1Cathode and the first polar capacitor C1Positive polarity terminate three level
Boost DC converters；
The three level Boosts DC converter further includes：Second polar capacitor C2,
The voltage of second polar capacitor is m times of output voltage, the first polar capacitor C1Voltage than the second polar capacitor C2Electricity
It forces down；
The width gain three-level Boost converter output voltage gain M is
Wherein, Uin、U0Respectively input, output voltage, m is modulation degree；
(1) on off state S1S2When=01, the first inductance L1, the second inductance L2Release energy, the first polar capacitor C1, the second pole
Property capacitance C2Equal storage energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 1-a, i.e. Uin-Db-L1-D1-L2-D3-C3-Q2-Uin, power supply U at this timeinWith the first inductance L1, the second inductance L2
To capacitance C3It charges, and is the energy supply of inverter DC bus side to load, at this time C4Electric discharge；
Closed circuit 1-b, i.e. L2-C1-D1-L2, the second inductance L at this time2Pass through the first diode D1To the first polar capacitor C1It carries out
Charging；
Closed circuit 1-c, i.e. Uin-Db-L1-D1— C2-Uin, power supply U at this timeinWith the first inductance L1Pass through the second diode DbWith
One diode D1To the second polar capacitor C2It charges；The total time t of on off state experience01=(1-d1)T；
Above-mentioned D3、D4It is fly-wheel diode；
(2) on off state S1S2When=10, the first inductance L1, the second inductance L2Release energy, the first polar capacitor C1, the second pole
Property capacitance C2Equal storage energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 2-a, i.e. Uin-Db-L1-D1-L2-Q1-C4-D4-Uin, at this point, power supply UinWith the first inductance L1, the second inductance L2
To capacitance C4It charges, and load is energized, at this time C3Electric discharge；
Closed circuit 2-b, i.e. L2-C1-D1-L2, the second inductance L at this time2Pass through the first diode D1To the first polar capacitor C1It carries out
Charging；
Closed circuit 2-c, i.e. Uin-Db-L1-D1— C2-Uin, power supply U at this timeinWith the first inductance L1Pass through the second diode DbWith
One diode D1To the second polar capacitor C2It charges, the total time t of on off state experience10=(1-d2)T；
(3) on off state S1S2When=11, the first inductance L1, the second inductance L2Equal storage energy, the first polar capacitor C1, the second pole
Property capacitance C2It releases energy, there are three voltage closed circuits for three level Boost DC converter of wide gain：
Closed circuit 3-a, i.e. Uin-Db-L1-D1-L2-Q1-Q2-Uin, power supply U at this timeinTo the first inductance L1, the second inductance L2Storage
Energy；
Closed circuit 3-b, i.e. Uin-Db-L1-C1-Q1-Q2-Uin, power supply U at this timeinWith the first polar capacitor C1To the first inductance L1Storage
Deposit energy；
Closed circuit 3-c, i.e. C2-L2-Q1-Q2-C2, the second polar capacitor C at this time2To the second inductance L2Store energy.The switch shape
The total time t of state experience11=[d1-(1-d2)]T；
Above-mentioned d1、d2Respectively power switch Q1、Q2Duty ratio；T is carrier cycle；
As power switch Q1、Q2On off state S1S2When=11, the input voltage U of converterinFor the first inductance L1, the second inductance
L2Store energy；UinWith the first polar capacitor C1For the first inductance L1Store energy, the second polar capacitor C2For the second inductance L2Storage
Deposit energy；
Work as S1S2When=01 or 10, the second inductance L2For the first polar capacitor C1Storage energy, UinWith the first inductance L1For the second pole
Property capacitance storage energy, while UinWith the first inductance L1, the second inductance L2Remaining energy provides for outlet side；
When being intended to 0.25, gain constantly increases modulation degree, avoids and causes the extreme duty of power switch because increasing gain
The problem of than running；By the energy of power supply, inductance, capacitance, time-sharing multiplex transmits in a manner described, reaches raising output voltage
The purpose of gain is highly suitable for the boosting occasion of fuel cell electric vehicle；Not only remain traditional three level Boost direct currents
The low advantage of converter power switch voltage stress, and widened voltage gain.
2. three level Boost DC converter of a kind of wide gain according to claim 1, which is characterized in that described first
Inductance L1Pass through the first diode D1It carries out energy storage and releases energy；The first polar capacitor C1Pass through the first diode D1It is stored up
Energy.
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| CN105610323A (en) * | 2016-03-17 | 2016-05-25 | 天津大学 | Wide-range input type boost-buck three-level DC converter for photovoltaic power generation |
| CN107733224B (en) * | 2017-09-21 | 2019-10-15 | 天津大学 | A kind of double frequency modulation method for the quasi- source Z three level DC booster converter |
| CN109347331A (en) * | 2018-12-05 | 2019-02-15 | 深圳市英可瑞科技股份有限公司 | A kind of tri-level switch power-supply system and its bus voltage eqaulation control method |
| CN113113963A (en) * | 2021-03-11 | 2021-07-13 | 三峡大学 | Digital iron tower on-line monitoring device multi-source self-power supply system based on three-port commutation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103326562A (en) * | 2013-06-17 | 2013-09-25 | 江苏大学 | Novel wind and light complementary double-input SEPIC DC-DC converter |
| CN103441668A (en) * | 2013-08-26 | 2013-12-11 | 华南理工大学 | High-gain boost DC-DC converter allowing pseudo continuous work |
| CN103490628A (en) * | 2013-09-16 | 2014-01-01 | 华南理工大学 | Single-phase high-gain boost converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326562A (en) * | 2013-06-17 | 2013-09-25 | 江苏大学 | Novel wind and light complementary double-input SEPIC DC-DC converter |
| CN103441668A (en) * | 2013-08-26 | 2013-12-11 | 华南理工大学 | High-gain boost DC-DC converter allowing pseudo continuous work |
| CN103490628A (en) * | 2013-09-16 | 2014-01-01 | 华南理工大学 | Single-phase high-gain boost converter |
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