CN103856061B - The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter - Google Patents

The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter Download PDF

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CN103856061B
CN103856061B CN201410063242.5A CN201410063242A CN103856061B CN 103856061 B CN103856061 B CN 103856061B CN 201410063242 A CN201410063242 A CN 201410063242A CN 103856061 B CN103856061 B CN 103856061B
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phase
bridge
conversion module
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shifting
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CN103856061A (en
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郭志强
沙德尚
廖晓钟
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Beijing Institute of Technology BIT
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Abstract

The present invention relates to a kind of gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter, belong to isolated DC transducer technical field.The inventive method by accessing a series LC network between the mid point of the leading-bridge top tube and down tube of the first phase-shifting full-bridge conversion module and the mid point of the second phase-shifting full-bridge conversion module lagging leg top tube and down tube, between the mid point of the mid point of the first phase-shifting full-bridge conversion module lagging leg top tube and down tube and the lagging leg top tube and down tube of the second phase-shifting full-bridge conversion module, access another series LC network, the no-voltage realizing each MOSFET is open-minded; Can automatically adapt to different input voltages, output voltage and load.The gamut Sofe Switch of phase-shifted full-bridge converter can be realized according to the present invention, improve the efficiency of whole converter; Be applicable to the conversion occasion that high input voltage exports to low pressure, and meet wide input voltage range, wide output voltage range, wide load variations.

Description

The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter
Technical field
The present invention relates to a kind of gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter, belong to isolated DC direct current (DC-DC) converter technical field.
Background technology
High voltage input and low-voltage exports extensive use in the industry.In order to overcome the restriction of parts selection, the scheme solving high voltage input and low-voltage output is roughly divided into: (1) devices in series; (2) multilevel converter; (3) series topology of converter.Devices in series technology is simple due to topology, is applied in high voltage direct current transmission by ABB.In order to realize dividing equally of each device voltage, still very large test is proposed to the design of control system.Multilevel converter can adapt to the occasion of high input voltage, but still based on 3 gentle five level application in practical application.Along with the increase of level number, the complexity of control strategy sharply increases, and its reliability is reduced.Due to the complexity of first two technology, converter input serial connection technology is made to obtain the attention of people.Converter input serial connection technology makes each converter bear a part of input voltage.2006 at IEEETransactiononIndustryApplication[commercial Application periodical] deliver " Common-Duty-RatioControlofInput-SeriesConnectedModularDC-DCConvertersWithActiveInputVoltageandLoad-CurrentSharing " one literary composition, adopt public duty ratio to realize the stable operation of input series and output parallel converter.2009 at IEEETransactiononIndustrialElectronics[industrial electronic] deliver " ControlStrategyforInput-Series – Output-ParallelConverters ", have employed the control strategy of initiatively all pressing and realize dividing equally of input series and output parallel phase-shifting full-bridge DC-DC converter power.The research of input series winding output-parallel converter widely, but is confined to the research to control strategy mostly, seldom studies the soft switch technique of input series and output parallel converter.
Summary of the invention
The object of the invention is not easily to realize the problem that no-voltage opens (ZVS) for solving lagging leg in the phase-shifted full-bridge converter of input series and output parallel when underloading, propose under one is applied in high pressure occasion, the phase-shifted full-bridge converter of input series and output parallel realizes that gamut is soft opens soft universal method.
Described gamut refers to that the input voltage of phase-shifted full-bridge converter, output voltage and load all can change, and the no-voltage realizing leading-bridge and lagging leg switching tube in excursion is opened (Zerovoltageswitching, ZVS).
The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter, specifically comprises the steps:
Step one, in the phase-shifted full-bridge converter comprising the first phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module, two module input voltage series connection, output voltage is in parallel.
First phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module comprise eight switching tubes, pipe, lower pipe on the lagging leg being respectively the first phase-shifting full-bridge conversion module, pipe, lower pipe on the leading-bridge of the first phase-shifting full-bridge conversion module, pipe, lower pipe on the lagging leg of the second phase-shifting full-bridge conversion module, pipe, lower pipe on the leading-bridge of the second phase-shifting full-bridge conversion module.
Look for the mid point that the leading-bridge top tube and down tube of the first phase-shifting full-bridge conversion module connect.
Step 2, finds the mid point that the lagging leg top tube and down tube of the second phase-shifting full-bridge conversion module connect.The no-load voltage ratio of the isolating transformer that the second phase-shifting full-bridge conversion module comprises and the identical of the first phase-shifting full-bridge conversion module.
Step 3, an access series LC network between the mid point of the second phase-shifting full-bridge conversion module lagging leg top tube and down tube that the mid point of the leading-bridge top tube and down tube of the first phase-shifting full-bridge conversion module obtained in step one and step 2 obtain, described series LC network is formed by an inductance and a capacitances in series, and the position of inductance and electric capacity can exchange.
Step 4, finds the mid point that the first phase-shifting full-bridge conversion module lagging leg top tube and down tube connect.
Step 5, finds the mid point that the second phase-shifting full-bridge conversion module leading-bridge top tube and down tube connect.
Step 6, access another series LC network between the mid point that the mid point of the first phase-shifting full-bridge conversion module lagging leg top tube and down tube obtained in step 4 and step 5 obtain the lagging leg top tube and down tube of the second phase-shifting full-bridge conversion module, the inductance value of the inductance of this LC network is identical with the capacitance of electric capacity with the inductance value of the inductance of the LC network in step 3 with the capacitance of electric capacity.
After adding two series LC network, eight switching tubes of the first phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module meet following sequential logic:
On the leading-bridge of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of pipe under the second phase-shifting full-bridge conversion module leading-bridge; Under the leading-bridge of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of pipe on the second phase-shifting full-bridge conversion module leading-bridge; Above-mentioned two groups of drive singal are defined as leading-bridge drive singal, are respectively pulse width modulation (PWM) signal that duty ratio is 0.5, and complementary, there is dead band between two groups of drive singal.
On the lagging leg of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of the lower pipe of the second phase-shifting full-bridge conversion module lagging leg; The lower pipe of the lagging leg of the first phase-shifting full-bridge conversion module is identical with the gate drive signals of the upper pipe of the second phase-shifting full-bridge conversion module lagging leg; Above-mentioned two groups of drive singal are defined as lagging leg drive singal, are also respectively the pwm signal that duty ratio is 0.5, and complementary, there is dead band between two groups of drive singal.
Step 7, the rising edge defining pipe drive singal on the first phase-shifting full-bridge conversion module leading-bridge to pipe drive singal under the first phase-shifting full-bridge conversion module lagging leg rising edge between time be the size of phase shifting angle.By regulating phase shifting angle size, control the output voltage of phase-shifted full-bridge converter:
The size of phase shifting angle determines the size of current amplitude in action time of two series LC network both end voltage and two LC networks.Phase shifting angle increases, and output voltage reduces, and the current amplitude in series LC network increases; Otherwise phase shifting angle reduces, output voltage increases, and the current amplitude in series LC network reduces.
When exporting as constant voltage, input voltage raises and causes phase shifting angle to increase, thus the current amplitude in series LC network increases, and the no-voltage realizing each MOSFET is opened (ZVS).When output voltage is constant and load reduces, phase shifting angle increases, and the current amplitude now in LC network increases, and the no-voltage realizing MOSFET is opened (ZVS).During phase-shifting full-bridge underloading, also ZVS can be realized.In output voltage change and the constant situation of output resistance, when output voltage is large, phase shifting angle reduces, and the electric current in series LC network reduces, and the no-voltage that now converter realizes MOSFET by transformer leakage inductance electric current is opened (ZVS).Along with output voltage reduces, power output also reduces, and phase shifting angle increases, and the current amplitude of series LC network increases, and now the Sofe Switch of MOSFET is realized by the electric current in LC network.
Beneficial effect
The inventive method can adapt to different input voltages, output voltage and load automatically.Gamut Sofe Switch can be realized according to the phase-shifted full-bridge converter that the inventive method obtains, thus the efficiency of whole converter can be improved.Be applicable to the conversion occasion that high input voltage exports to low pressure, and the situation of wide input voltage range, wide output voltage range, wide load variations can be met.
Accompanying drawing explanation
Fig. 1 is the input series and output parallel phase-shifted full-bridge converter topology diagram adding two LC networks in embodiment;
Fig. 2 is the typical waveform of drive singal, transformer output voltage and current waveform in embodiment, LC network both end voltage and electric current, wherein (a) is large or input voltage is little at output voltage, and bearing power large when, phase shifting angle is little voltage and current waveform, b () is little or input voltage is large at output voltage, and power output little when, phase shifting angle is large voltage and current waveform.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
According to the method flow of summary of the invention, this embodiment proposes a kind of input series and output parallel phase-shifted full-bridge converter, comprises eight identical MOSFET(metal oxide semiconductor field effect tubes) Q 1, Q 2, Q 3, Q 4, Q 5, Q 6, Q 7, Q 8, two identical LC network (L r1and C r1, L r2and C r2), two identical input capacitance C d1and C d2, two transformer T r1and T r2, two output inductor L f1and L f2, filter capacitor C owith four rectifier diode D 1, D 2, D 3, D 4.
LC network comprises an inductance and a resistance, is in series.Q 1-Q 8for switching tube.Two input capacitance C d1and C d2play dividing potential drop.Transformer secondary is rectification circuit (is the full-wave rectification of transformer belt mid-point tap, or is the full-bridge rectification of a winding).
The annexation of above-mentioned part is: two input capacitance C d1and C d2in parallel with input voltage after series connection.The voltage that each electric capacity bears is equivalent to 1/2 of input voltage.C d1in parallel with the first phase-shifting full-bridge conversion module, C d2in parallel with the second phase-shifting full-bridge conversion module.
Composition and the annexation of the first phase-shifting full-bridge conversion module are: MOSFETQ 1source electrode connect MOSFETQ 2drain electrode, MOSFETQ 3source electrode connect MOSFETQ 4drain electrode, Q 1, Q 2and Q 3, Q 4in parallel; Input voltage V inpositive pole connect MOSFETQ respectively 1drain electrode and MOSFETQ 3drain electrode, MOSFETQ 2source electrode and MOSFETQ 4source electrode be connected to C d1electronegative potential side.Q 1source electrode and Q 3source electrode be connected to transformer T r1the two ends on former limit.Transformer T r1secondary be two windings, the upper end of two windings is Same Name of Ends; The Same Name of Ends of first winding is connected to diode D 1anode, different name end is connected with the Same Name of Ends of second winding, and this tie point is transformer T r1the mid-point tap of vice-side winding.Transformer T r1the different name end of secondary second winding connect diode D 2anode.The negative electrode of diode D1 with D2 is connected, and is connected to inductance L simultaneously f1one end.
Composition and the annexation of the second phase-shifting full-bridge conversion module are: MOSFETQ 5source electrode connect MOSFETQ 6drain electrode, MOSFETQ 7source electrode connect MOSFETQ 8drain electrode, Q 5, Q 6and Q 7, Q 8in parallel; MOSFETQ 5drain electrode connect MOSFETQ 7drain electrode, and be connected to C d2high potential side; MOSFETQ 2source electrode connect MOSFETQ 4source electrode, and be connected to input voltage V innegative pole.Q 5source electrode and Q 7source electrode be connected to transformer T r2the two ends on former limit.Transformer T r2no-load voltage ratio and transformer T r1no-load voltage ratio identical.Transformer T r2secondary be two windings, the upper end of two windings is Same Name of Ends, and the Same Name of Ends of first winding is connected to diode D 3anode, its different name end is transformer T r2the mid-point tap of vice-side winding, and be connected with the Same Name of Ends of second winding.Transformer T r2the different name end of secondary second winding connect diode D 4anode.Diode D 3and D 4negative electrode be connected, and be connected to inductance L f2one end.
L f1and L f2the other end be the positive pole of output voltage, connect filter capacitor C respectively owith load resistance R o.Filter capacitor C owith load resistance R oparallel connection, C oand R othe other end respectively connection transformer T r1the mid-point tap of vice-side winding and transformer T r2the mid-point tap of vice-side winding is the negative pole of output voltage.
Electric capacity C r2and inductance L r2form a series LC network, input connects MOSFETQ 1source electrode, output is connected to MOSFETQ 7source electrode.
Electric capacity C r1and inductance L r1constitute another series LC network, input connects MOSFETQ 3source electrode, output is connected to MOSFETQ 5source electrode.
Electric capacity C r1capacitance and electric capacity C r2capacitance identical; Inductance L r1inductance value and inductance L r2inductance value identical.The position of inductance and electric capacity can exchange.
In the present embodiment, add the input series and output parallel phase-shifted full-bridge converter topological structure of two LC networks as shown in Figure 1, wherein rectification illustrates (still can adopt full-bridge rectification) for full-wave rectification.C d1and C d2for input derided capacitors, Q 1-Q 8for MOSFET; C j1-C j8for the junction capacitance of MOSFET; T r1and T r2for isolating transformer; D 1-D 4for rectifier diode, L f1and L f2for output inductor.C ofor output filter capacitor; R ofor load resistance.L r1and L r2for the inductance of series LC network, C r1and C r2for the electric capacity of series LC network.
Figure 2 shows that the MOSFETQ in described circuit 1-Q 8driving logical waveform, the voltage at transformer output voltage and electric current, series LC network two ends and flow through the current waveform of LC network.Wherein, Fig. 2 (a) is large or input voltage is little at output voltage, and is the situation of big space rate when bearing power is large, and Fig. 2 (b) is little or input voltage large at output voltage, and power output hour is the situation of little duty ratio.
Each MOSFETQ 1-Q 8drive singal meet following relation:
MOSFETQ 1and MOSFETQ 6drive singal identical; MOSFETQ 2and MOSFETQ 5drive singal identical; Above-mentioned two groups of drive singal are respectively the pwm signal that duty ratio is 0.5, and complementary.This group drive singal is defined as leading-bridge drive singal.MOSFETQ 1and MOSFETQ 2form the leading-bridge of the first phase-shifting full-bridge conversion module; MOSFETQ 5and MOSFETQ 6constitute the leading-bridge of the second phase-shifting full-bridge conversion module.
MOSFETQ 3and MOSFETQ 8drive singal identical; MOSFETQ 4and MOSFETQ 7drive singal identical; Above-mentioned two groups of drive singal are also respectively the pwm signal that duty ratio is 0.5, and complementary.This group drive singal is defined as lagging leg drive singal.MOSFETQ 3and MOSFETQ 4constitute the lagging leg of the first phase-shifting full-bridge conversion module; MOSFETQ 7and MOSFETQ 8constitute the lagging leg of the second phase-shifting full-bridge conversion module.
T in Fig. 2 0to t 8for the operation mode of half period.
As interval [t 1, t 2], lagging leg Q 3and Q 8turn off simultaneously.Now, i p1and i r1simultaneously and C j3and C j4resonance, i p2and i r2simultaneously and C j7and C j8resonance.Work as t 2time, C j3and C j8voltage be charged to V in/ 2, C j4and C j7voltage be discharged into 0, now Q 4and Q 7body diode conducting.Work as t 3time, Q 4and Q 7no-voltage is opened (ZVS).
At interval [t 5, t 6], leading-bridge switch Q 1and Q 6turn off, i p1and i r2simultaneously and C j1and C j2resonance, i p2and i r1simultaneously and C j5and C j6resonance.Work as t 6time, C j1and C j6voltage be charged to V in/ 2, C j2and C j5voltage be discharged into 0, now Q 2and Q 5body diode conducting.Work as t 7time, Q 2and Q 5no-voltage is opened (ZVS).The mode of half period switching tube is similar to front half period in addition.
As shown in Figure 2, MOSFETQ 1and MOSFETQ 6drive singal rising edge is to MOSFETQ 4and MOSFETQ 7timing definition between drive singal rising edge is phase shifting angle.The output voltage of converter is controlled by the size of the phase shift of leading-bridge drive singal and lagging leg drive singal; The size of phase shifting angle also determines the action time of two LC network both end voltage, thus determines the size of current amplitude in two LC networks.
Phase shifting angle increases, and output voltage reduces; Otherwise phase shifting angle reduces, output voltage increases.As found out the increase along with phase shifting angle in figure in 2, the current amplitude in series LC network increases.Otherwise phase shifting angle reduces, the current amplitude in series LC network reduces.When exporting as constant voltage, input voltage raises and causes phase shifting angle to increase, thus the current amplitude in LC network increases, and the no-voltage of each MOSFET is opened (ZVS) and more easily realized.When output voltage is constant and load reduces, phase shifting angle also can increase, and the current amplitude now in series LC network increases, and the no-voltage being also conducive to MOSFET is opened (ZVS).During phase-shifting full-bridge underloading, not easily realize Sofe Switch, so also ZVS can be realized when this invention can ensure phase-shifting full-bridge underloading.In output voltage change and the constant situation of output resistance, when output voltage increases, phase shifting angle reduces, the electric current reduction in series LC network.But the no-voltage that now converter still can realize MOSFET by transformer leakage inductance electric current is opened (ZVS).Along with output voltage reduces, power output also reduces, and phase shifting angle increases, and the current amplitude of series LC network increases.Now the Sofe Switch of MOSFET is realized by the electric current in LC network.Therefore, the present invention can adapt to different input voltages, output voltage and load automatically.Gamut Sofe Switch can be realized according to the phase-shifted full-bridge converter that the inventive method obtains.

Claims (4)

1. the gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter, is characterized in that: specifically comprise the steps:
Step one, in the phase-shifted full-bridge converter comprising the first phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module, the input voltage series connection of the first phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module, output voltage is in parallel;
First phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module comprise eight switching tubes, pipe, lower pipe on the lagging leg being respectively the first phase-shifting full-bridge conversion module, pipe, lower pipe on the leading-bridge of the first phase-shifting full-bridge conversion module, pipe, lower pipe on the lagging leg of the second phase-shifting full-bridge conversion module, pipe, lower pipe on the leading-bridge of the second phase-shifting full-bridge conversion module;
Look for the mid point that the leading-bridge top tube and down tube of the first phase-shifting full-bridge conversion module connect;
Step 2, finds the mid point that the lagging leg top tube and down tube of the second phase-shifting full-bridge conversion module connect; The no-load voltage ratio of the isolating transformer that the second phase-shifting full-bridge conversion module comprises and the identical of the first phase-shifting full-bridge conversion module;
Step 3, an access series LC network between the mid point of the second phase-shifting full-bridge conversion module lagging leg top tube and down tube that the mid point of the leading-bridge top tube and down tube of the first phase-shifting full-bridge conversion module obtained in step one and step 2 obtain, described series LC network is formed by an inductance and a capacitances in series;
Step 4, finds the mid point that the first phase-shifting full-bridge conversion module lagging leg top tube and down tube connect;
Step 5, finds the mid point that the second phase-shifting full-bridge conversion module leading-bridge top tube and down tube connect;
Step 6, access another series LC network between the mid point of the leading-bridge top tube and down tube of the second phase-shifting full-bridge conversion module that the mid point of the first phase-shifting full-bridge conversion module lagging leg top tube and down tube obtained in step 4 and step 5 obtain, the inductance value of LC net inductive is identical with the capacitance of electric capacity with the inductance value of the LC net inductive in step 3 with the capacitance of electric capacity;
After adding two series LC network, eight switching tubes of the first phase-shifting full-bridge conversion module and the second phase-shifting full-bridge conversion module meet following sequential logic:
On the leading-bridge of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of pipe under the second phase-shifting full-bridge conversion module leading-bridge; Under the leading-bridge of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of pipe on the second phase-shifting full-bridge conversion module leading-bridge; On the leading-bridge of the first phase-shifting full-bridge conversion module pipe and the second phase-shifting full-bridge conversion module leading-bridge under pipe, the first phase-shifting full-bridge conversion module leading-bridge under pipe and the second phase-shifting full-bridge conversion module leading-bridge on pipe be leading-bridge drive singal, be respectively the pulse width modulating signal that duty ratio is 0.5, and complementary, there is dead band between two groups of drive singal;
On the lagging leg of the first phase-shifting full-bridge conversion module, pipe is identical with the gate drive signals of the lower pipe of the second phase-shifting full-bridge conversion module lagging leg; The lower pipe of the lagging leg of the first phase-shifting full-bridge conversion module is identical with the gate drive signals of the upper pipe of the second phase-shifting full-bridge conversion module lagging leg; On the lagging leg of the first phase-shifting full-bridge conversion module, pipe and the lower pipe of the second phase-shifting full-bridge conversion module lagging leg, the lower pipe of the lagging leg of the first phase-shifting full-bridge conversion module and the upper pipe of the second phase-shifting full-bridge conversion module lagging leg are lagging leg drive singal, be respectively the pulse width modulating signal that duty ratio is 0.5, and complementary, there is dead band between two groups of drive singal;
Step 7, on the first phase-shifting full-bridge conversion module leading-bridge pipe drive singal rising edge to pipe drive singal under the first phase-shifting full-bridge conversion module lagging leg rising edge between time be the size of phase shifting angle; Regulate phase shifting angle size, control the output voltage of phase-shifted full-bridge converter:
When exporting as constant voltage, input voltage raises and causes phase shifting angle to increase, and the current amplitude in series LC network increases, and the no-voltage realizing each phase-shifting full-bridge conversion module is open-minded; When output voltage is constant and load reduces, phase shifting angle increases, and the current amplitude in LC network increases, and the no-voltage realizing phase-shifted full-bridge converter is open-minded; During phase-shifted full-bridge converter underloading, also no-voltage can be realized open-minded; In output voltage change and the constant situation of output resistance, when output voltage is large, phase shifting angle reduces, and the electric current in series LC network reduces, and the no-voltage that transposition full-bridge converter realizes phase-shifted full-bridge converter by transformer leakage inductance electric current is open-minded; Along with output voltage reduces, power output also reduces, and phase shifting angle increases, and the current amplitude of series LC network increases, and realizes the Sofe Switch of phase-shifted full-bridge converter.
2. the gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter according to claim 1, it is characterized in that: the input voltage of phase-shifted full-bridge converter, output voltage and load all can change, and the no-voltage realizing leading-bridge and lagging leg switching tube in excursion is open-minded.
3. the gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter according to claim 1, is characterized in that: the position of inductance and electric capacity can exchange.
4. the gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter according to claim 1, is characterized in that: the size of phase shifting angle determines the size of current amplitude in action time of two series LC network both end voltage and two LC networks.
CN201410063242.5A 2014-02-25 2014-02-25 The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter Expired - Fee Related CN103856061B (en)

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