CN103986330B - A kind of resonance step-up DC/DC conversion device and its control method suitable for high-power occasion - Google Patents
A kind of resonance step-up DC/DC conversion device and its control method suitable for high-power occasion Download PDFInfo
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Abstract
The present invention discloses a kind of resonance step-up DC/DC conversion device and its control method suitable for high-power occasion, the converter connects direct-current input power supplying and load, including two primary side diodes, first to fourth switching tube, resonant element, the first to the second commutation diode, two filter capacitors, it is characterised in that resonant element connects the bridge arm and two commutation diodes and two rectification units of filter capacitor composition that four switching tubes are constituted.The achievable switching tube near zero voltage shut-off of the present invention and the zero-current switching of commutation diode, can be greatly reduced loss, while the voltage stress of all switching devices is no more than 1/2nd of output voltage.Resonance circuit of the invention can be used for high-power boosting occasion.
Description
Technical field
The present invention relates to DC converter field, high-power boosting occasion is can be applied to.
Background technology
Wind-power electricity generation is one of world today's utilization of new energy resources form with fastest developing speed, and Oversea wind power generation is not accounted for because having
The most attention of coastal various countries of the world is subject to the features such as abundant with land soil, wind energy resources.With marine wind electric field capacity
Be continuously increased and offshore distance increase, it is defeated using HVDC (High Voltage Direct Current, HVDC)
Electricity has turned into inexorable trend.HVDC transmissions of electricity have the advantages that not influenceed by capacity current, adjustable active and reactive power is exported,
But traditional offshore wind farm field system based on middle pressure ac bus is, it is necessary to using bulky, heavy power frequency boosting transformation
Device, the construction to blower fan pylon and marine change of current platform proposes very high request.For disadvantages mentioned above, recent domestic
Rise to based on the dc bus marine wind electric field systematic research of middle pressure, by using high-power voltage boosting dc converter
Traditional duplex frequency boostering transformer is substituted, system bulk and weight can be greatly reduced.High-power voltage boosting dc converter is
Key core part in the system, the electric energy that blower fan is produced is required for carrying out voltage transformation by it and power transmission is lost and is
High power transmission.
Current domestic and foreign scholars have carried out some research to the high-power voltage boosting dc converter in the system, first
Various feasible topological circuits are proposed afterwards.The many level DC converters of block combiner are highly suitable to be applied for high-power
Close, this converter is coupled together two block combiner multi-level converters by intermediate-frequency transformer, and its major defect is big
The manufacture of power high voltage intermediate-frequency transformer is extremely difficult.Document " Multiple module high gain high
Voltage DC-DC transformers for offshore wind energy systems " propose one kind by one
The electricity of Boost and a structure for Buck/Boost converter input-series and output-parallels, switching device and diode
Pressure and current stress are relatively reduced.But the reverse recovery loss of the hard switching and diode due to switching device result in converter
It is less efficient.Document " Analysis and comparison of medium voltage high power DC/DC
Converters for offshore wind energy systems " propose a kind of direct current based on resonant switched capacitor
Booster converter, it is possible to achieve the Sofe Switch and modular construction of switching tube, but its not only output voltage regulation it is poor and
And need a large amount of capacitors.The Jovcic of Aberdeen of Britain is taught in document " Step-up dc-dc converter for
A kind of new resonance step-up converter is proposed in megawatt size applications ", switch can be not only realized
The Sofe Switch of device and the reverse-recovery problems for avoiding diode, can also realize step-up ratio very high.But such resonance step-up becomes
Parallel operation there is also the following deficiency：Switching device is required for backward voltage blocking ability；Resonant capacitance, resonant inductance and
The voltage stress of all switching devices is all approximately output voltage；Resonant inductance unidirectional magnetiztion, magnetic core utilization rate is not high, causes humorous
The inductance volume and weight that shakes is all larger, and loss is also corresponding to be increased.
The content of the invention
Goal of the invention：For above-mentioned prior art, propose a kind of resonance step-up suitable for high-power occasion it is straight/it is straight
Converter and its control method, not only realize output boosting but also realize near zero voltage shut-off and the commutation diode of switching tube
Zero-current switching, while so that the voltage stress of resonant element and switching device is no more than 1/2nd of output voltage.
Technical scheme：A kind of resonance step-up DC/DC conversion device suitable for high-power occasion, including full-bridge inverting electricity
Road, resonant element and rectification unit；The input connection direct-current input power supplying of the full bridge inverter, full bridge inverter
Output end connect the input of the rectification unit, the output end connection load of the rectification unit, the resonant element with
The output end of full bridge inverter and the input of rectification unit are connected in parallel.
Used as preferred scheme of the invention, the full bridge inverter includes one to the 4th switching tube, the pole of the first primary side two
Pipe and the second primary side diode；The diode of the primary side first, first switch pipe, the 3rd switching tube are followed in series to form first
Branch road, the diode of the primary side second, second switch pipe, the 4th switching tube are followed in series to form the second branch road, described first
Branch road and the second branch circuit parallel connection are at direct-current input power supplying two ends；
The rectification unit includes the first commutation diode, the second commutation diode, the first filter capacitor and the second filter
Ripple electric capacity；First commutation diode and the second commutation diode forward direction are connected in series the 3rd branch road of composition, first filter
Ripple electric capacity and the second filter capacitor are connected in series the 4th branch road of composition, and the 3rd branch road and the 4th branch circuit parallel connection are in load two
End；
The resonant element is the LC antiresonant circuits being made up of inductance and electric capacity；The one of the LC antiresonant circuits
End is connected in the abutment end of the first switch pipe and the 3rd switching tube, while being connected in the first filter capacitor and the second filter capacitor
Abutment end；The other end of the LC antiresonant circuits is connected in the abutment end of the second switch pipe and the 4th switching tube, while
It is connected in the abutment end of first commutation diode and the second commutation diode.
A kind of control method of the resonance step-up DC/DC conversion device suitable for high-power occasion：The control method
A controlling cycle be divided into continuous eight stages, wherein：
First stage：t0＜ t ＜ t1
In t0Moment, first switch pipe and the 4th switching tube are turned on, vCr=Vin, wherein vCrIt is the electric capacity in resonant element
Voltage, VinIt is the voltage of direct-current input power supplying；Input current loop is by direct-current input power supplying, the diode of primary side first,
One switching tube, inductance and the 4th switching tube are constituted, and the voltage on inductance is equal to input voltage Vin, t0~t1Inductance in moment
Electric current is linearly increased, and inductive current is from I0Start to increase linearly to I1, the first filter capacitor and the second filter capacitor provide load
Output current；
Second stage：t1＜ t ＜ t2
In t1Moment, first switch pipe and the 4th switching tube are simultaneously turned off, and inductance and electric capacity occur parallel resonance, until t2
Moment vCr=-Vo/ 2, wherein VoIt is converter output voltage；First filter capacitor and the second filter capacitor provide load output electricity
Stream；
Phase III：t2＜ t ＜ t3
In t2Moment, vCr=-Vo/ 2, the first commutation diode conducting, the electric current in inductance flows through the first commutation diode
Charged to the first filter capacitor, and load current is provided；In t2~t3It is interior, vCrKeep constant, electric current is linearly reduced on inductance
Zero；
Fourth stage：t3＜ t ＜ t4
In t3Moment, iLr=I3=0, vCr=Vo/ 2, wherein iLrRepresent the electric current of resonant inductance, I3Represent that resonant inductance exists
t3There is parallel resonance in the electric current at moment, the shut-off of the first commutation diode, inductance and electric capacity, until vCr=-Vin；
5th stage：t4＜ t ＜ t5
In t4Moment, second switch pipe and the 3rd switching tube are turned on, vCr=-Vin, input current loop is by direct current input
Power supply, the diode of primary side second, second switch pipe, inductance and the 3rd switching tube are constituted, and the voltage on inductance is equal to negative input
Voltage-Vin, t4~t5The electric current of inductance linearly reversely increases in moment, and inductive current is from-I4Start reverse linear increase to-
I5, the first filter capacitor and the second filter capacitor provide load output current
6th stage：t5＜ t ＜ t6
In t5Moment, second switch pipe and the 3rd switching tube are simultaneously turned off, and inductance occurs parallel resonance with electric capacity, until vCr
=Vo/ 2, the first filter capacitor and the second filter capacitor provide load output current；
7th stage：t6＜ t ＜ t7
In t6Moment, vCr=Vo/ 2, the second commutation diode conducting, the electric current in inductance flows through the second commutation diode,
Charged to the second filter capacitor, and load current is provided；In t6~t7It is interior, vCrKeep constant, electric current is linearly reduced on inductance
Zero；
8th stage：t7＜ t ＜ t8
In t7Moment, iLr=I7=0, vCr=Vo/ 2, I7It is resonant inductance in t7The electric current at moment, the second commutation diode
There is parallel resonance in shut-off, inductance and electric capacity, until vCr=Vin。
Beneficial effect：Resonance step-up DC/DC conversion device and its controlling party suitable for high-power occasion of the invention
In method, converter has voltage gain very high, and the no-voltage of achievable switching tube is opened and turned off near zero voltage and whole
The zero-current switching of diode is flowed, Simultaneous Switching frequency range is small, the symmetrical two-way magnetization of resonant inductance；Controlled resonant converter
/ 2nd of the voltage stress of resonant element and switching device no more than output voltage；While boost function is realized, make
Each switching tube and diode realize Sofe Switch, effectively reduce loss, with efficiency very high, are suitable for high-power biography
It is defeated.
Brief description of the drawings
Fig. 1 is the LC controlled resonant converter topology diagrams of example；
Fig. 2 is circuit related elements work wave schematic diagram shown in Fig. 1；
Fig. 3 is circuit first stage operation mode schematic diagram shown in Fig. 1；
Fig. 4 is circuit second stage shown in Fig. 1, fourth stage, the 6th stage, the 8th stage operation mode schematic diagram；
Fig. 5 is circuit phase III operation mode schematic diagram shown in Fig. 1；
Fig. 6 is the operation mode schematic diagram of the 5th stage of circuit shown in Fig. 1；
Fig. 7 is the operation mode schematic diagram of the 7th stage of circuit shown in Fig. 1.
Specific embodiment
The present invention is done below in conjunction with the accompanying drawings further is explained.
Fig. 1 is an example of the present invention circuit topological structure figure.It is of the invention a kind of suitable for high-power occasion
Resonance step-up DC/DC conversion device, including full bridge inverter, resonant element and rectification unit.Full bridge inverter it is defeated
Enter end and connect direct-current input power supplying Vin, the output end of full bridge inverter connects the input of rectification unit, rectification unit it is defeated
Go out end connection load R, resonant element is connected in parallel with the output end of full bridge inverter and the input of rectification unit.Its
In, full bridge inverter includes first to fourth switching tube Q1~Q4, the first primary side diode Di1And the second primary side diode
Di2.The first diode of primary side Di1, first switch pipe Q1, the 3rd switching tube Q3It is followed in series to form tie point；Primary side the two or two
Pole pipe Di2, second switch pipe Q2, the 4th switching tube Q4Be followed in series to form the second branch road；Tie point and the second branch road are simultaneously
It is associated in direct-current input power supplying two ends.Rectification unit includes the first commutation diode DR1, the second commutation diode DR2, first filtering
Electric capacity C1And the second filter capacitor C2.First commutation diode DR1With the second commutation diode DR2Forward direction is connected in series composition
Three branch roads；First filter capacitor C1With the second filter capacitor C2It is connected in series the 4th branch road of composition；3rd branch road and the 4th branch road are simultaneously
It is associated in load two ends.Resonant element is by inductance LrWith electric capacity CrThe LC antiresonant circuits of composition.The one of LC antiresonant circuits
End is connected in first switch pipe Q1With the 3rd switching tube Q3Abutment end, while being connected in the first filtered electrical C1With the second filter capacitor C2
Abutment end；The other end of LC antiresonant circuits is connected in second switch pipe Q2With the 4th switching tube Q4Abutment end, while being connected in
First commutation diode DR1With the second commutation diode DR2Abutment end.Meanwhile, the first primary side diode Di1Anode be connected on directly
The positive pole of input power is flowed, negative electrode is connected on first switch pipe Q1；Second primary side diode Di2Anode be connected on direct-current input power supplying
Positive pole, negative electrode is connected on second switch pipe Q2；Direct-current input power supplying negative pole is connected on the 3rd switching tube Q3With the 4th switching tube Q4
Abutment end.First filter capacitor C1First end is connected on the first commutation diode DR1Negative electrode, the first filter capacitor C1Second termination
In one end of resonant element；Second filter capacitor C2First end is connected on the second commutation diode DR2Anode, the second filter capacitor
C2Second end is connected on one end of resonant element.
The resonance step-up DC/DC conversion device control method suitable for high-power occasion of the invention is carried out in detail below
Describe in detail bright.
As shown in Figure 2 and Figure 3, the first stage：t0＜ t ＜ t1
In t0Moment, first switch pipe Q1With the 4th switching tube Q4Conducting, vCr=Vin, wherein vCrIt is the electricity in resonant element
The voltage of appearance, VinIt is the voltage of direct-current input power supplying；Input current loop is by direct-current input power supplying, the diode of primary side first
Di1, first switch pipe Q1, inductance LrAnd the 4th switching tube Q4Constitute, inductance LrOn voltage be equal to input voltage Vin, t0~t1
Inductance L in momentrElectric current iLrLinearly increase, this stage be input to inductance supplement energy process, inductive current from
I0Start to increase linearly to I1, the first filter capacitor C1With the second filter capacitor C2Load R is providedLOutput current；
As shown in Figure 2, Figure 4 shows, second stage：t1＜ t ＜ t2
In t1Moment, first switch pipe Q1With the 4th switching tube Q4Simultaneously turn off, inductance LrWith electric capacity CrGeneration parallel resonance,
Until vCr=-Vo/ 2, Vo/ 2 is resonant capacitance CrOn maximum voltage drop, while the 4th switching tube Q4Its maximum voltage is reached
Drop Vo/ 2, first switch pipe Q1Its maximum voltage drop V is reachedin, the second diode of primary side Di2Its maximum voltage drop V is reachedo/
2-Vin, wherein VoIt is converter output voltage；First filter capacitor C1With the second filter capacitor C2Load R is providedLOutput current；
Input and output end do not have energy to transmit in this process, and output current is still provided by filter capacitor, and energy is in inductance
Transmitted and electric capacity between, but gross energy on inductance and electric capacity is constant；
As shown in Fig. 2, Fig. 5, the phase III：t2＜ t ＜ t3
In t2Moment, vCr=-Vo/ 2, the first commutation diode DR1Conducting, inductance LrIn electric current flow through the first rectification two
Pole pipe DR1To the first filter capacitor C1Charge, and load R is providedLElectric current；In t2~t3It is interior, vCrKeep constant, inductance LrUpper electric current
Linear to reduce, the energy of input is transmitted to load R during this periodL, this process is zero end until inductive current；
As shown in Figure 2, Figure 4 shows, fourth stage：t3＜ t ＜ t4
In t3Moment, iLr=I3=0, vCr=-Vo/ 2, wherein iLrRepresent resonant inductance LrElectric current, I3Represent resonant inductance
In t3The electric current at moment, the first commutation diode DR1Shut-off, realizes the zero-current switching of commutation diode, hereafter inductance LrWith
Electric capacity CrGeneration parallel resonance, until vCr=-Vin, in this period, the gross energy on inductance and electric capacity is constant；
As shown in Fig. 2, Fig. 6, the 5th stage：t4＜ t ＜ t5
In t4Moment, second switch pipe Q2With the 3rd switching tube Q3Conducting, vCr=-Vin, input current loop is by direct current
Input power, the second diode of primary side Di2, second switch pipe Q2, inductance LrAnd the 3rd switching tube Q3Constitute, inductance LrOn electricity
Pressure is equal to negative input voltage-Vin, t4~t5Inductance L in momentrElectric current iLrLinear reversely to increase, this stage is to input to
Inductance supplements the process of energy, and inductive current is from-I4Starting reverse linear increases to-I5, the first filter capacitor C1With the second filtering
Electric capacity C2Load R is providedLOutput current；
As shown in Figure 2, Figure 4 shows, the 6th stage：t5＜ t ＜ t6
In t5Moment, second switch pipe Q2With the 3rd switching tube Q3Simultaneously turn off, now inductance LrWith electric capacity CrGeneration is in parallel
Resonance, until vCr=Vo/ 2, now the 3rd switching tube Q3Its maximum voltage drop V is reachedo/ 2, second switch pipe Q2It is reached
Maximum voltage drop Vin, the first diode of primary side Di1Its maximum voltage drop V is reachedo/2-Vin, the first filter capacitor C1With the second filter
Ripple electric capacity C2Load R is providedLOutput current；Input and output end do not have energy to transmit in this process, and output current is still
There is provided by filter capacitor, energy transmitted between inductance and electric capacity, but gross energy on inductance and electric capacity is constant；
7th stage：t6＜ t ＜ t7
As shown in Fig. 2, Fig. 7, in t6Moment, vCr=Vo/ 2, the second commutation diode DR2Conducting, inductance LrIn electric current stream
Cross the second commutation diode DR2, to the second filter capacitor C2Charge, and load R is providedLElectric current；In t6~t7It is interior, vCrKeep not
Become, inductance LrUpper electric current is linearly reduced, and the energy of input is transmitted to load during this period, and this process is until inductive current
Zero terminates；
As shown in Figure 2, Figure 4 shows, the 8th stage：t7＜ t ＜ t8
In t7Moment, iLr=I7=0, vCr=Vo/ 2, I7It is resonant inductance in t7The electric current at moment, hereafter the second rectification two
Pole pipe DR2Shut-off, realizes commutation diode DR2Zero-current switching, hereafter inductance LrWith electric capacity CrGeneration parallel resonance, until
vCr=Vin, in this period, the gross energy on inductance and electric capacity is constant.
Resonance step-up DC/DC conversion device control method suitable for high-power occasion of the invention, can realize boosting
Function, and each switching tube and diode realize Sofe Switch, effectively reduce loss, with efficiency very high, are adapted to big
Power transmission.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of resonance step-up DC/DC conversion device suitable for high-power occasion, it is characterised in that：Including full-bridge inverting electricity
Road, resonant element and rectification unit；The input connection direct-current input power supplying of the full bridge inverter, full bridge inverter
Output end connect the input of the rectification unit, the output end connection load of the rectification unit, the resonant element with
The output end of full bridge inverter and the input of rectification unit are connected in parallel；
Wherein, the full bridge inverter includes first to fourth switching tube (Q1~Q4), the first diode of primary side (Di1) and
The second diode of primary side (Di2)；The first diode of the primary side (Di1), first switch pipe (Q1), the 3rd switching tube (Q3) successively
Tie point in series, the second diode of the primary side (Di2), second switch pipe (Q2), the 4th switching tube (Q4) string successively
Connection constitutes the second branch road, and the tie point and the second branch circuit parallel connection are at direct-current input power supplying two ends；
The rectification unit includes the first commutation diode (DR1), the second commutation diode (DR2), the first filter capacitor (C1) with
And the second filter capacitor (C2)；First commutation diode (the DR1) and the second commutation diode (DR2) forward direction is connected in series composition
3rd branch road, the first filter capacitor (C1) and the second filter capacitor (C2) it is connected in series the 4th branch road of composition, described 3rd
Road and the 4th branch circuit parallel connection are at load two ends；
The resonant element is by inductance (Lr) and electric capacity (Cr) constitute LC antiresonant circuits；The LC antiresonant circuits
One end be connected in the first switch pipe (Q1) and the 3rd switching tube (Q3) abutment end, while being connected in the first filter capacitor (C1)
With the second filter capacitor (C2) abutment end；The other end of the LC antiresonant circuits is connected in the second switch pipe (Q2) and
4th switching tube (Q4) abutment end, while being connected in the first commutation diode (DR1) and the second commutation diode (DR2) phase
Connect end.
2. the control method of a kind of resonance step-up DC/DC conversion device suitable for high-power occasion described in claim 1, its
It is characterised by：One controlling cycle of the control method is divided into continuous eight stages, wherein：
First stage：t0<t<t1
In t0Moment, first switch pipe (Q1) and the 4th switching tube (Q4) conducting, vCr=Vin, wherein vCrIt is the electricity in resonant element
The voltage of appearance, VinIt is the voltage of direct-current input power supplying；Input current loop is by direct-current input power supplying, the diode of primary side first
(Di1), first switch pipe (Q1), inductance (Lr) and the 4th switching tube (Q4) constitute, inductance (Lr) on voltage be equal to input electricity
Pressure Vin, t0~t1Inductance (L in momentr) electric current (iLr) linearly increase, inductive current is from I0Start to increase linearly to I1, the
One filter capacitor (C1) and the second filter capacitor (C2) load (R is providedL) output current；
Second stage：t1<t<t2
In t1Moment, first switch pipe (Q1) and the 4th switching tube (Q4) simultaneously turn off, inductance (Lr) and electric capacity (Cr) there is parallel connection
Resonance, until vCr=-Vo/ 2, wherein VoIt is converter output voltage；First filter capacitor (C1) and the second filter capacitor (C2) carry
For load (RL) output current；
Phase III：t2<t<t3
In t2Moment, vCr=-Vo/ 2, the first commutation diode (DR1) conducting, inductance (Lr) in electric current flow through the pole of the first rectification two
Pipe (DR1) give the first filter capacitor (C1) charge, and load (R is providedL) electric current；In t2~t3It is interior, vCrKeep constant, inductance (Lr)
Upper electric current is linearly reduced to zero；
Fourth stage：t3<t<t4
In t3Moment, iLr=I3=0, vCr=-Vo/ 2, wherein iLrRepresent resonant inductance (Lr) electric current, I3Represent that resonant inductance exists
t3The electric current at moment, the first commutation diode (DR1) shut-off, inductance (Lr) and electric capacity (Cr) there is parallel resonance, until vCr=-
Vin；
5th stage：t4<t<t5
In t4Moment, second switch pipe (Q2) and the 3rd switching tube (Q3) conducting, vCr=-Vin, input current loop is defeated by direct current
Enter power supply, the second diode of primary side (Di2), second switch pipe (Q2), inductance (Lr) and the 3rd switching tube (Q3) constitute, inductance
(Lr) on voltage be equal to negative input voltage-Vin, t4~t5Inductance (L in momentr) electric current (iLr) linear reversely increase, electricity
Inducing current is from-I4Starting reverse linear increases to-I5, the first filter capacitor (C1) and the second filter capacitor (C2) load (R is providedL)
Output current；
6th stage：t5<t<t6
In t5Moment, second switch pipe (Q2) and the 3rd switching tube (Q3) simultaneously turn off, inductance (Lr) and electric capacity (Cr) there is parallel connection
Resonance, until vCr=Vo/ 2, the first filter capacitor (C1) and the second filter capacitor (C2) load (R is providedL) output current；
7th stage：t6<t<t7
In t6Moment, vCr=Vo/ 2, the second commutation diode (DR2) conducting, inductance (Lr) in electric current flow through the pole of the second rectification two
Pipe (DR2), to the second filter capacitor (C2) charge, and load (R is providedL) electric current；In t6~t7It is interior, vCrKeep constant, inductance
(Lr) on electric current be linearly reduced to zero；
8th stage：t7<t<t8
In t7Moment, iLr=I7=0, vCr=Vo/ 2, I7It is resonant inductance in t7The electric current at moment, the second commutation diode (DR2)
Shut-off, inductance (Lr) and electric capacity (Cr) there is parallel resonance, until vCr=Vin。
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| CN104638930A (en) * | 2014-12-30 | 2015-05-20 | 国家电网公司 | High-voltage large-capacity DC/DC (Direct Current) converter suitable for DC power supply |
| CN104901544B (en) * | 2015-06-10 | 2018-03-23 | 无锡中汇汽车电子科技有限公司 | A kind of two-output impulse generator resonance step-up converter |
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| CN101488718B (en) * | 2009-03-05 | 2011-11-23 | 英飞特电子（杭州）有限公司 | Voltage multiplying synchronous rectifying multi-resonance soft switching converter |
| CN101702578B (en) * | 2009-12-07 | 2012-01-11 | 浙江大学 | Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof |
| CN101951159B (en) * | 2010-09-20 | 2013-04-24 | 浙江大学 | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer |
| CN102111075A (en) * | 2011-03-04 | 2011-06-29 | 东南大学 | Voltage doubling rectifying push-pull normal shock converter |
| CN102611319B (en) * | 2012-03-14 | 2014-10-29 | 东南大学 | Non-symmetrical bidirectional direct-current converter |
| CN202503443U (en) * | 2012-03-14 | 2012-10-24 | 东南大学 | Asymmetrical bidirectional direct current transformer |
| CN103607032B (en) * | 2013-11-20 | 2016-08-17 | 梁一桥 | Renewable energy power generation, power transmission and transformation and electrical network access integral system |
| CN103795262B (en) * | 2014-02-20 | 2016-04-13 | 东南大学 | LC parallel resonance boosting DC/DC conversion device and control method thereof |
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2014
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