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 PDF

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Publication number
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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CN
China
Prior art keywords
transformer
modulation
switching
resonant capacitance
rectification unit
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CN201810549690.4A
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Chinese (zh)
Inventor
吴铁洲
郭炅
王鹿军
廖力
徐元中
常春
王钰
熊金龙
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Hubei University of Technology
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Hubei University of Technology
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Priority to CN201810549690.4A priority Critical patent/CN108736733A/en
Publication of CN108736733A publication Critical patent/CN108736733A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/3353Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • H02M1/0058Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio
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%.
CN201810549690.4A 2018-05-31 2018-05-31 Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio Pending CN108736733A (en)

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