CN108736733A - Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio - Google Patents
Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio Download PDFInfo
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- CN108736733A CN108736733A CN201810549690.4A CN201810549690A CN108736733A CN 108736733 A CN108736733 A CN 108736733A CN 201810549690 A CN201810549690 A CN 201810549690A CN 108736733 A CN108736733 A CN 108736733A
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- rectification unit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of variable turns ratios, and two-way DC/DC converters are isolated, including the first input/output source, the second input/output source, the first modulation/rectification unit, the second modulation/rectification unit, the first resonant capacitance of transformer primary avris, the second resonant capacitance of transformer primary avris, the first resonant capacitance of transformer secondary side, the second resonant capacitance of transformer secondary side, three switching switches and high-frequency isolation transformer.The invention also discloses a kind of control methods controlling the converter.Secondary transformer group is creatively divided into the fixed coil being serially connected and at least one switching coil by the present invention, realizes the transformation of transformer turns ratio with removal by the access of switching coil.The present invention also creatively increases capacitance on transformer primary pair both sides, constitutes series resonance using the leakage inductance and capacitance of transformer, realizes the Sofe Switch of transformer primary pair side device, reduce the loss of switching device, improve efficiency.
Description
Technical field
The invention belongs to power converter technical fields, and in particular to a kind of variable turns ratio be isolated two-way DC/DC converters and
Its control method.
Background technology
As the application fields such as green regenerative energy sources, electric vehicle continue to develop, there is an urgent need to bidirectional, dcs to convert skill
Art realizes the two-way flow of energy, and in some emerging fields, such as energy storage field, the voltage change ratio of converter can not
Meet practice to require.
In the photovoltaic inverting system of accumulation energy type, two direct current input systems are respectively battery input and photovoltaic panel direct current
Input, the two are got up by DC bus-bar voltage interconnection.Battery is low-pressure side.Generally for meeting parallel network reverse requirement,
DC bus-bar voltage is high-pressure side.When the cell is discharged, it needs the low pressure of battery being increased to bus voltage value.And it is needing to make
With the energy of busbar voltage be battery charging when, then need the high pressure drop by busbar as low as cell voltage.Energy is needed for this
The occasion for measuring two-way flow, needs two unidirectional DC/DC converter negative directions used in parallel, although such way can reach
The purpose of energy in bidirectional flow, but overall circuit can become extremely complex.Two-way DC/DC converters then can be easily real
The transmitted in both directions of existing energy.In addition, the voltage change ratio of the two-way DC/DC converters of some finished products on the market is substantially solid at present
Fixed, but the voltage change ratio in practical scientific research project has more grade, and therefore, completed transformer in practice can not be very
The good technology requirement met in process of scientific research.
Invention content
In order to solve above-mentioned background technology, the present invention is intended to provide a kind of isolation of variable turns ratio is two-way
DC/DC converters and its control method, the Sofe Switch of modulation device and rectifying device when realizing the transmitted in both directions of energy improve double
The efficiency of converter.
In order to achieve the above technical purposes, the technical scheme is that：
A kind of two-way DC/DC converters of variable turns ratio isolation, which is characterized in that including：First input/output source, second
Input/output source, the first modulation/rectification unit, the second modulation/rectification unit, high-frequency isolation transformer, transformer primary avris
First resonant capacitance, the second resonant capacitance of transformer primary avris, the first resonant capacitance of transformer primary avris for being connected in series with
Switching switch between the second resonant capacitance of transformer primary avris, the first resonant capacitance of transformer secondary side, transformer secondary side
The second resonant capacitance of the second resonant capacitance, the first resonant capacitance of transformer secondary side being connected in parallel and transformer secondary side between
Switching switch, the switch that is arranged between the second modulation/rectification unit and secondary transformer group；
The high-frequency isolation transformer includes transformer leakage inductance, magnetizing inductance and transformer, and transformer includes transformer
Primary coil and secondary transformer group, secondary transformer group include the fixed coil being serially connected and at least one cut
Emat coil, the switching coil has the first end being connected with the fixed coil and the second end opposite with first end, when opening
When the plectrum of pass is allocated to the first end of the switching coil, the primary transformer coil and the fixed coil generate alternation magnetic
, when the plectrum of switch is allocated to the second end of the switching coil, the fixed coil and switching coil formed it is common around
Group generates alternating magnetic field with the primary transformer coil group.
Further, first input/output source and the second input/output source include positive signal source and negative signal
Source, the first modulation/rectification unit and the second modulation/rectification unit include the first~the 4th end, the high-frequency isolation transformer
Magnetizing inductance include first end and second end, the primary and secondary side of the transformer includes first end and second end；Transformation
The first end of device primary side is connected with the magnetizing inductance first end of the high-frequency isolation transformer, and the high-frequency isolation through being sequentially connected in series
The transformer leakage inductance of transformer, the second resonant capacitance of transformer primary avris, the first resonance of transformer primary avris being connected in series with
The first resonant capacitance and first of switching switch and transformer primary avris between the second resonant capacitance of capacitance and transformer primary avris
The third end of modulation/rectification unit connects, the magnetizing inductance of the second end of transformer primary side and the high-frequency isolation transformer the
Two ends are connected, and are connect with the 4th end of the first modulation/rectification unit；The first end of the fixed coil of secondary transformer group
The first resonant capacitance through transformer secondary side is connect with the third end of the second modulation/rectification unit, and the of transformer secondary side
Transformer secondary side first resonant capacitance of the first end of two resonant capacitances through being connected in parallel and the second resonance of transformer secondary side
Switching switch between capacitance is connect with the first end of the first resonant capacitance of transformer secondary side, and the second of transformer secondary side is humorous
The second end of capacitance of shaking is connect with the second end of the first resonant capacitance of transformer secondary side, aforementioned switching coil have with it is described solid
The connected first end of alignment circle and the second end opposite with first end, the first end and second end of the switching coil pass through selection
Switch connect with the 4th end of the second modulation/rectification unit, and the first end of the first modulation/rectification unit connection first inputs/
The positive signal source of output source, the negative signal source in the first input/output source of second end connection of the first modulation/rectification unit, second
The first end of modulation/rectification unit connects the positive signal source in the second input/output source, the second end of the second modulation/rectification unit
Connect the negative signal source in the second input/output source.
Further, the converter also include the first filter capacitor and the second filter capacitor, the one of the first filter capacitor
The positive signal source in end the first input/output source of connection, the negative signal source in its first input/output source of other end connection, second
One end of filter capacitor connects the positive signal source in the second input/output source, and the second input of other end connection of the second filter capacitor/
The negative signal source of output source.
Further, the first modulation/rectification unit includes the first~the 4th switching tube, the drain electrode connection the of first switch pipe
The drain electrode of two switching tubes, the source electrode of third switching tube connect the source electrode of the 4th switching tube, and the source electrode of first switch pipe connects third
The drain electrode of switching tube, the source electrode of second switch pipe connect the drain electrode of the 4th switching tube, and the drain electrode of first switch pipe is adjusted as first
The first end of system/rectification unit, the second end of the source electrode of the 4th switching tube as the first modulation/rectification unit, first switch pipe
Source electrode as the first modulation/rectification unit third end, the drain electrode of the 4th switching tube as the first modulation/rectification unit the 4th
End, the second modulation/rectification unit include the 5th~the 8th switching tube, the leakage of drain electrode the 6th switching tube of connection of the 5th switching tube
Pole, the source electrode of the 7th switching tube connect the source electrode of the 8th switching tube, and the source electrode of the 5th switching tube connects the drain electrode of the 7th switching tube,
The source electrode of 6th switching tube connects the drain electrode of the 8th switching tube, and the drain electrode of the 5th switching tube is as the second modulation/rectification unit
First end, the second end of the source electrode of the 8th switching tube as the second modulation/rectification unit, the source electrode of the 5th switching tube is as second
The third end of modulation/rectification unit, the 4th end of the 8th switching tube to drain as the second modulation/rectification unit；The first~the
The built-in parasitic diode of eight switching tubes, the source electrode of the anode connection respective switch pipe of parasitic diode, the moon of parasitic diode
Pole connects the drain electrode of respective switch pipe.
Further, the first~the 8th switching tube is MOSFET.
The present invention also provides the control method that two-way DC/DC converters are isolated in a kind of above-mentioned variable turns ratio, default conditions
Under, the second end of the switching coil on aforementioned transformer pair side is connected by the 4th end of selecting switch and the second modulation/rectification unit
It connects, the switching switch between the second resonant capacitance of the first resonant capacitance of transformer primary avris being connected in series with and transformer primary avris
Plectrum pushes the first end of the second resonant capacitance of transformer primary avris, the first resonant capacitance of transformer secondary side being connected in parallel with
Switching switch between the second resonant capacitance of transformer secondary side is closed, and when converter needs to reduce the turn ratio, converter needs first
Stop the driving of the first~the 8th switching tube, i.e., the first~the 8th switching tube keeps transformer leakage inductance electric all in off state
Stream is reduced to zero.Then make again the first end of the switching coil on aforementioned transformer pair side pass through selecting switch with second modulation/it is whole
The 4th end connection for flowing unit, makes the first resonant capacitance of transformer primary avris being connected in series with and transformer primary avris second later
The plectrum of switching switch between resonant capacitance pushes the second end of the second resonant capacitance of transformer primary avris, the transformation being connected in parallel
Switching switch between the second resonant capacitance of the first resonant capacitance of device pair avris and transformer secondary side disconnects.
Further, when the first end of the switching coil by aforementioned transformer pair side by selecting switch with second modulation/
The second end for the switching coil that the 4th end connection of rectification unit is switched to aforementioned transformer pair side passes through selecting switch and second
When the 4th end connection of modulation/rectification unit, the description of action sequence and front is essentially identical, but the transformer primary being connected in series with
The transformer pair that switching between the second resonant capacitance of the first resonant capacitance of avris and transformer primary avris is switched and is connected in parallel
The action of switching switch between the first resonant capacitance of avris and the second resonant capacitance of transformer secondary side is opposite with the description of front.
Further, when energy is from the first input/output source stream to the second input/output source, the second modulation/rectification list
Four switching tubes of member are turned off, and the first switch pipe and the 4th switching tube of the first modulation/rectification unit are simultaneously turned on or closed
Disconnected, the second switch pipe and third switching tube of the first modulation/rectification unit are simultaneously turned on or are turned off, and first switch pipe and second
Switching tube is complementary conducting；When energy is from the second input/output source stream to the first input/output source, the first modulation/rectification
Four switching tubes of unit are turned off, the 5th switching tube of the second modulation/rectification unit and the 8th switching tube simultaneously turn on or
Shutdown, the 6th switching tube of the second modulation/rectification unit and the 7th switching tube simultaneously turn on or turn off, and the 5th switching tube and the
Six switching tubes are complementary conductings；The duty ratio of first~the 8th switching tube is 50%.
It is using the advantageous effect that above-mentioned technical proposal is brought：
The present invention creatively increases capacitance, according to transformer by the structure of change circuit on transformer primary pair both sides
Equivalent model, the inductance on transformer both sides and capacitance equivalent can be arrived into one side, the leakage inductance and capacitance of transformer is utilized to constitute
Series resonance makes the modulation device of converter and rectifying device that can realize transformer primary side tune in the bi-directional of energy
The Zero Current Switch of the zero voltage switch of device processed and secondary side rectifying device, reduces the damage of power device in the whole process
Consumption, realizes the purpose for the efficiency for improving two-way isolation DC/DC converters.
In addition, the present invention also creatively realizes the transformation of transformer turns ratio so that converter is in different no-load voltage ratio items
Sofe Switch can be realized under part, improve the flexibility of converter.
Description of the drawings
Fig. 1 is circuit topological structure schematic diagram of the present invention.
The equivalent structure schematic diagram of energy reverse flow when Fig. 2 is the low turn ratio of the present invention.
The equivalent structure schematic diagram of energy reverse flow when Fig. 3 is the high turn ratio of the present invention.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention is described in detail.
The structural schematic diagram of the energy forward flow of the present invention as shown in Figure 1, a kind of two-way DC/DC of variable turns ratio isolation become
Parallel operation, including the first input/output source, the second input/output source, the first modulation/rectification unit, the second modulation/rectification unit,
First resonant capacitance Cr1a of transformer primary avris, the second resonant capacitance Cr1b of transformer primary avris, the transformation being connected in series with
Switching switch S10 between the second resonant capacitance of the first resonant capacitance of device primary side side and transformer primary avris and transformer primary avris
The connected primary transformer coil of the second resonant capacitance, transformer secondary side the first resonant capacitance Cr2a, transformer secondary
Second resonant capacitance Cr2b of side, the second resonance of the first resonant capacitance of transformer secondary side and transformer secondary side being connected in parallel
Switching switch S9 between capacitance, the secondary transformer group being connected with the first resonant capacitance of transformer secondary side, transformer
Leakage inductance Lr, magnetizing inductance Lm and the switch S11 being arranged between the second modulation/rectification unit and secondary transformer group,
First input/output source and the second input/output source include positive signal source and negative signal source, the first modulation/rectification unit and
Second modulation/rectification unit includes the first~the 4th end, and the primary and secondary side of transformer includes first end and second end, is become
Transformer leakage inductance Lr of the first end of depressor primary side through being sequentially connected in series, the second resonant capacitance Clrb of transformer primary avris, series connection
Switching switch S10 between the second resonant capacitance of the first resonant capacitance of transformer primary avris and transformer primary avris of connection and transformation
First resonant capacitance Cr1a of device primary side side is connect with the third end of the first modulation/rectification unit, the second end of transformer primary side
It is connect with the 4th end of the first modulation/rectification unit, secondary transformer group includes the fixed coil being serially connected and at least
One switching coil, first resonant capacitance Cr2a and second modulation/rectification of the first end through transformer secondary side of fixed coil
The third end of unit connects, transformer secondary of the first end through being connected in parallel of the second resonant capacitance Cr2b of transformer secondary side
First of switching switch S9 and transformer secondary side between the second resonant capacitance of the first resonant capacitance of side and transformer secondary side is humorous
It shakes the first end connection of capacitance Cr2a, the second end of the second resonant capacitance Cr2b of transformer secondary side and transformer secondary side the
The second end of one resonant capacitance Cr2a connects, and aforementioned switching coil has the first end being connected with the fixed coil and with first
Hold opposite second end, the first end and second end of the switching coil by selecting switch S11 with the second modulation/rectification list
The 4th end connection of member, the first end of the first modulation/rectification unit connect the positive signal source in the first input/output source, and first adjusts
The second end of system/rectification unit connects the negative signal source in the first input/output source, and the first end of the second modulation/rectification unit connects
The positive signal source in the second input/output source is connect, the second end of the second modulation/rectification unit connects the negative of the second input/output source
Signal source.
Wherein, which also includes the first filter capacitor C1 and the second filter capacitor C2, and the one of the first filter capacitor C1
The positive signal source in end the first input/output source of connection, the negative signal source in its first input/output source of other end connection, second
One end of filter capacitor C2 connects the positive signal source in the second input/output source, the other end connection second of the second filter capacitor C2
The negative signal source in input/output source.
Wherein, the first modulation/rectification unit includes the first~the 4th switching tube S1~S4, and the drain electrode of first switch pipe S1 connects
The drain electrode of second switch pipe S2 is connect, the source electrode of first switch pipe S1 connects the drain electrode of third switching tube S3, third switching tube S3's
Source electrode connects the source electrode of the 4th switching tube S4, and the source electrode of second switch pipe S2 connects the drain electrode of the 4th switching tube S4, first switch
First end of the drain electrode of pipe S1 as the first modulation/rectification unit, the source electrode of the 4th switching tube S4 is as the first modulation/rectification list
The second end of member, the source electrode of first switch pipe S1 as the first modulation/rectification unit third end, make by the drain electrode of the 4th switching tube S4
For the 4th end of the first modulation/rectification unit, the second modulation/rectification unit includes the 5th~the 8th switching tube, the 5th switching tube
The drain electrode of the 6th switching tube S6 of drain electrode connection of S5, the source electrode of the 8th switching tube S8 of source electrode connection of the 7th switching tube S7, the 5th
The source electrode of switching tube S5 connects the drain electrode of the 7th switching tube S7, and the source electrode of the 6th switching tube S6 connects the leakage of the 8th switching tube S8
Pole, the first end of the 5th switching tube S5 to drain as the second modulation/rectification unit, the source electrode of the 8th switching tube S8 is as second
The second end of modulation/rectification unit, the third end of the source electrode of the 5th switching tube S5 as the second modulation/rectification unit, the 8th opens
Close fourth end of the drain electrode of pipe S8 as the second modulation/rectification unit；Described first~the 8th switching tube S1~S8 is built-in to be posted
Raw diode, the source electrode of the anode connection respective switch pipe of parasitic diode, the cathode of parasitic diode connect respective switch pipe
Drain electrode.Wherein, the first~the 8th switching tube is MOSFET.
The present invention also provides the method that two-way DC/DC converters are isolated for controlling a kind of above-mentioned variable turns ratio, acquiescences
Under state, the second end of the switching coil on aforementioned transformer pair side passes through selecting switch and the 4th of the second modulation/rectification unit the
End connects, and the switching between the second resonant capacitance of the first resonant capacitance of transformer primary avris being connected in series with and transformer primary avris is opened
The plectrum of pass pushes the first end of the second resonant capacitance of transformer primary avris, transformer secondary side the first resonance electricity being connected in parallel
The switching switch held between the second resonant capacitance of transformer secondary side is closed, when converter needs the smaller turn ratio, transformation
Device makes transformation firstly the need of the driving for stopping the first~the 8th switching tube, i.e., the first~the 8th switching tube all in off state
Device leakage inductance current reduction is to zero.Then the first end of the switching coil on aforementioned transformer pair side is made to pass through selecting switch and second again
4th end of modulation/rectification unit connects, and makes the first resonant capacitance of transformer primary avris being connected in series with and transformer primary later
The plectrum of switching switch between the second resonant capacitance of avris pushes the second end of the second resonant capacitance of transformer primary avris, and parallel connection is even
Switching switch between the second resonant capacitance of the first resonant capacitance of transformer secondary side connect and transformer secondary side disconnects.Entire mistake
Cheng Zhong, the switch all act under zero current/voltage conditions, the damage that will not be switched caused by excessive voltage or current spike
It is bad.Driving dwell time such as the first~the 8th switching tube is too short, and converter internal current is not yet reduced to zero, at this time aforementioned change
Switch between the switching coil on depressor pair side and the 4th end of the second modulation/rectification unit, the transformer primary side being connected in series with
The transformer secondary that switching between the second resonant capacitance of the first resonant capacitance of side and transformer primary avris is switched and is connected in parallel
When switching switch motion between the second resonant capacitance of the first resonant capacitance of side and transformer secondary side, larger voltage or electricity are had
Flow spike.But if voltage or current spike still in the safety requirements of switch, are also subjected to.
When the first end of the switching coil by aforementioned transformer pair side passes through selecting switch and the second modulation/rectification unit
The second end for the switching coil that the connection of 4th end is switched to aforementioned transformer pair side passes through selecting switch and the second modulation/rectification list
When the 4th end connection of member, the description of action sequence and front is essentially identical, but the transformer primary avris first being connected in series with is humorous
Shake the switching switch between the second resonant capacitance of capacitance and transformer primary avris and the transformer secondary side first that is connected in parallel it is humorous
The action of the switching switch to shake between capacitance and the second resonant capacitance of transformer secondary side is opposite with the description of front.
When energy is from the first input/output source stream to the second input/output source, four of the second modulation/rectification unit
Switching tube is turned off, and the first switch pipe and the 4th switching tube of the first modulation/rectification unit are simultaneously turned on or turned off, and first adjusts
The second switch pipe and third switching tube of system/rectification unit are simultaneously turned on or are turned off, and first switch pipe and second switch pipe are
Complementation conducting；When energy is from the second input/output source stream to the first input/output source, the four of the first modulation/rectification unit
A switching tube is turned off, and the 5th switching tube of the second modulation/rectification unit and the 8th switching tube are simultaneously turned on or turned off, and second
6th switching tube of modulation/rectification unit and the 7th switching tube are simultaneously turned on or are turned off, and the 5th switching tube and the 6th switching tube
It is complementary conducting；The duty ratio of first~the 8th switching tube is 50%.
In the present embodiment, which is used in the photovoltaic inverter system of accumulation energy type, using battery as this hair
The first bright input and output source, using DC bus-bar voltage as the second input/output source of the present invention, when selecting switch S11 connects
When to a points, the secondary side turn ratio of original of transformer is 1: n, n > 1, and when being connected to b points, the secondary side turn ratio of original of transformer is 1: 2n, n
The first resonant capacitance Cr1a of > 1, transformer primary avris are equal with the second resonant capacitance Cr1b of transformer primary avris, and value is equal
The first resonant capacitance Cr2a for Cr1, transformer secondary side is equal with the second resonant capacitance Cr2b of transformer secondary side, value
It is Cr2.The energy forward flow schematic diagram of the present invention as shown in Figure 1 is flowed to when energy flows from left to right from battery
DC bus, the switching tube in the first modulation/rectification unit play high frequency modulated, the parasitism in the second modulation/rectification unit
Diode plays rectified action.According to the equivalent analysis of transformer, when switch S11 is connected to a points, the total capacitance of transformer secondary side is
Cr2 is equivalent to be to primary sideIt is connected into resonant capacitance, resonant capacitance and leakage inductance Lr structures with the total capacitance Cr1 of transformer primary avris
At LC series resonances, resonant frequency is：
Similarly, such as Fig. 2, the energy reverse flow schematic diagram of the shown present invention, when energy flows from right to left, i.e., from straight
Stream busbar flows to battery, and the switching tube in the second modulation/rectification unit plays high frequency modulated, in the first modulation/rectification unit
Parasitic diode play rectified action, the total capacitance Cr1 of transformer primary avris it is equivalent to pair side be n2Cr1The transformer secondary side and
Total capacitance Cr2 be connected into resonant capacitance, transformer leakage inductance Lr is equivalent to be to secondary sideResonant capacitance and leakage inductance Lr constitute LC
Series resonance, resonant frequency are：Gained resonant frequency when energy forward flow is carried out
It arranges, also obtains,Resonant frequency when understanding Two-way energy transfer is consistent, i.e. energy
Working frequency when two-way operation is identical.
When switch S11 is connected to b points, the total capacitance of transformer secondary side is 2Cr2, equivalent to be to primary sideAnd transformation
The total capacitance of device primary side sideIt is connected into resonant capacitance, resonant capacitance and leakage inductance 2Lr constitute LC series resonances, and resonant frequency is：
Similarly, the energy reverse flow schematic diagram of the present invention as shown in Figure 3, when energy flows from right to left, i.e., from straight
Stream busbar flows to battery, and the switching tube in the second modulation/rectification unit plays high frequency modulated, in the first modulation/rectification unit
Parasitic diode rise rectified action, the total capacitance of transformer primary avrisIt is equivalent to be to secondary sideAnd transformer
The total capacitance of secondary avris is that 2Cr2 is connected into resonant capacitance, and transformer leakage inductance 2Lr is equivalent to be to secondary sideResonant capacitance and leakage
Feel 2Lr and constitute LC series resonances, resonant frequency is：Switch S11 is connected to b
Gained resonant frequency is arranged when energy positively or negatively flows when point, is also obtained,
Known under two kinds of turn ratioes, resonant frequency when Two-way energy transfer is consistent, i.e., the work under two kinds of turn ratioes when energy two-way operation
Working frequency is identical.
The technological thought of the present invention is illustrated in conjunction with diagram above, it is evident that without departing from the scope of the present invention
On the basis of technology, the prior art and technique can much be changed, it is every according to technological thought proposed by the present invention,
Any change done on the basis of technical solution, each falls within the scope of the present invention.
Claims (8)
1. two-way DC/DC converters are isolated in a kind of variable turns ratio, it is characterised in that：Including the first input/output source, second defeated
Enter/output source, the first modulation/rectification unit, the second modulation/rectification unit, high-frequency isolation transformer, transformer primary avris
One resonant capacitance, the second resonant capacitance of transformer primary avris, the first resonant capacitance of transformer primary avris for being connected in series with and become
Switching switch between the second resonant capacitance of depressor primary side side, the first resonant capacitance of transformer secondary side, transformer secondary side
Between the second resonant capacitance of second resonant capacitance, the first resonant capacitance of transformer secondary side being connected in parallel and transformer secondary side
The switch that switching switchs, is arranged between the second modulation/rectification unit and secondary transformer group；
The high-frequency isolation transformer includes transformer leakage inductance, magnetizing inductance and transformer, and transformer includes transformer primary side
Coil and secondary transformer group, secondary transformer group include the fixed coil being serially connected and at least one switch line
Circle, the switching coil has the first end being connected with the fixed coil and the second end opposite with first end, when switch
When plectrum is allocated to the first end of the switching coil, the primary transformer coil and the fixed coil generate alternating magnetic field,
When the plectrum of switch is allocated to the second end of the switching coil, the fixed coil and switching coil formed common winding with
The primary transformer coil generates alternating magnetic field.
2. two-way DC/DC converters are isolated in variable turns ratio according to claim 1, it is characterised in that：First input/
Output source and the second input/output source include positive signal source and negative signal source, and the first modulation/rectification unit and the second modulation/
Rectification unit includes the first~the 4th end, and the magnetizing inductance of the high-frequency isolation transformer includes first end and second end, institute
The primary and secondary side for stating transformer includes first end and second end；The first end of transformer primary side and the high-frequency isolation transformation
The magnetizing inductance first end of device is connected, and the second resonant capacitance of the transformer leakage inductance through being sequentially connected in series, transformer primary avris, string
Join the switching switch and transformation between the second resonant capacitance of the first resonant capacitance of transformer primary avris and transformer primary avris of connection
First resonant capacitance of device primary side side is connect with the third end of the first modulation/rectification unit；The second end of transformer primary side and institute
The magnetizing inductance second end for stating high-frequency isolation transformer is connected, and is connect with the 4th end of the first modulation/rectification unit；Transformer
The first end of the fixed coil of secondary coil group is through the first resonant capacitance of transformer secondary side and the second modulation/rectification unit
Third end connects, transformer secondary side first resonance of the first end through being connected in parallel of the second resonant capacitance of transformer secondary side
Switching switch and the first of the first resonant capacitance of transformer secondary side between the second resonant capacitance of capacitance and transformer secondary side
End connection, the second end of the second resonant capacitance of transformer secondary side connect with the second end of the first resonant capacitance of transformer secondary side
It connects, aforementioned switching coil has the first end being connected with the fixed coil and the second end opposite with first end, the switching
The first end and second end of coil is connect with the 4th end of the second modulation/rectification unit by selecting switch, the first modulation/whole
The first end for flowing unit connects the positive signal source in the first input/output source, the second end connection first of the first modulation/rectification unit
The negative signal source in input/output source, the first end of the second modulation/rectification unit connect the positive signal source in the second input/output source,
The second end of second modulation/rectification unit connects the negative signal source in the second input/output source.
3. two-way DC/DC converters are isolated in variable turns ratio according to claim 1 or 2, it is characterised in that：The converter
Also include the first filter capacitor and the second filter capacitor, one end of the first filter capacitor connects the positive letter in the first input/output source
Number source, its other end connect the negative signal source in the first input/output source, and the second input of one end connection of the second filter capacitor/
The positive signal source of output source, the other end of the second filter capacitor connect the negative signal source in the second input/output source.
4. two-way DC/DC converters are isolated in variable turns ratio according to claim 1 or 2, it is characterised in that：Described first adjusts
System/rectification unit includes the first~the 4th switching tube, the drain electrode of the drain electrode connection second switch pipe of first switch pipe, third switch
The source electrode of pipe connects the source electrode of the 4th switching tube, the drain electrode of the source electrode connection third switching tube of first switch pipe, second switch pipe
Source electrode connect the drain electrode of the 4th switching tube, first end of the drain electrode as the first modulation/rectification unit of first switch pipe, the 4th
Second end of the source electrode of switching tube as the first modulation/rectification unit, the source electrode of first switch pipe is as the first modulation/rectification list
First third end, the 4th end of the 4th switching tube to drain as the first modulation/rectification unit；Second modulation/rectification unit includes
5th~the 8th switching tube, the drain electrode of drain electrode the 6th switching tube of connection of the 5th switching tube, the source electrode connection the of the 7th switching tube
The source electrode of eight switching tubes, the source electrode of the 5th switching tube connect the drain electrode of the 7th switching tube, the source electrode connection the 8th of the 6th switching tube
The source electrode of the drain electrode of switching tube, the first end of the 5th switching tube to drain as the second modulation/rectification unit, the 8th switching tube is made
For the second end of the second modulation/rectification unit, the third end of the source electrode of the 5th switching tube as the second modulation/rectification unit,
Fourth end of the drain electrode of eight switching tubes as the second modulation/rectification unit；The built-in parasitic diode of first~the 8th switching tube,
The source electrode of the anode connection respective switch pipe of parasitic diode, the drain electrode of the cathode connection respective switch pipe of parasitic diode.
5. two-way DC/DC converters are isolated in variable turns ratio according to claim 4, it is characterised in that：Described the first~the
Eight switching tubes are MOSFET.
6. the control method of two-way DC/DC converters is isolated in the variable turns ratio described in a kind of claim 4, it is characterised in that：It is silent
Recognize under state, the second end of the switching coil of the transformer secondary pass through selecting switch and the second modulation/rectification unit the
Four ends connect, the switching between the second resonant capacitance of the first resonant capacitance of transformer primary avris being connected in series with and transformer primary avris
The plectrum of switch pushes the first end of the second resonant capacitance of transformer primary avris, the first resonance of transformer secondary side being connected in parallel
Switching switch between the second resonant capacitance of capacitance and transformer secondary side is closed, when converter needs to reduce the turn ratio, converter
Firstly the need of the driving for stopping the first~the 8th switching tube, i.e., the first~the 8th switching tube makes transformer all in off state
Then leakage inductance current reduction makes the first end of the switching coil on aforementioned transformer pair side pass through selecting switch and is adjusted with second again to zero
4th end of system/rectification unit connects, and makes the first resonant capacitance of transformer primary avris being connected in series with and transformer primary side later
The plectrum of switching switch between the second resonant capacitance of side pushes the second end of the second resonant capacitance of transformer primary avris, is connected in parallel
The second resonant capacitance of the first resonant capacitance of transformer secondary side and transformer secondary side between switching switch disconnect.
7. the control method of two-way DC/DC converters is isolated in variable turns ratio according to claim 6, it is characterised in that：When
It is connect with the 4th end of the second modulation/rectification unit by selecting switch by the first end of the switching coil on aforementioned transformer pair side
The second end for being switched to the switching coil on aforementioned transformer pair side passes through the 4th end of selecting switch and the second modulation/rectification unit
When connection, action sequence and the description in claim 6 are essentially identical, but transformer primary avris the first resonance electricity being connected in series with
Transformer secondary side the first resonance electricity for holding the switching switch between the second resonant capacitance of transformer primary avris and being connected in parallel
Hold opposite with the description in claim 6 with the action of the switching switch between the second resonant capacitance of transformer secondary side.
8. the control method of two-way DC/DC converters is isolated in variable turns ratio according to claim 6, it is characterised in that：When
When energy is from the first input/output source stream to the second input/output source, four switching tubes of the second modulation/rectification unit close
It closes, the first switch pipe and the 4th switching tube of the first modulation/rectification unit are simultaneously turned on or turned off, the first modulation/rectification list
The second switch pipe and third switching tube of member are simultaneously turned on or are turned off, and first switch pipe and second switch pipe are complementary conductings
's；When energy is from the second input/output source stream to the first input/output source, four switching tubes of the first modulation/rectification unit
It is turned off, the 5th switching tube of the second modulation/rectification unit and the 8th switching tube are simultaneously turned on or turned off, the second modulation/whole
The 6th switching tube and the 7th switching tube for flowing unit are simultaneously turned on or are turned off, and the 5th switching tube and the 6th switching tube are that complementation is led
Logical；The duty ratio of first~the 8th switching tube is 50%.
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