CN102931843B - Soft-switch full-bridge direct-current transformer of self-driven active auxiliary network - Google Patents
Soft-switch full-bridge direct-current transformer of self-driven active auxiliary network Download PDFInfo
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- CN102931843B CN102931843B CN201110226471.0A CN201110226471A CN102931843B CN 102931843 B CN102931843 B CN 102931843B CN 201110226471 A CN201110226471 A CN 201110226471A CN 102931843 B CN102931843 B CN 102931843B
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- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 29
- 230000006698 induction Effects 0.000 claims description 24
- 230000003071 parasitic effect Effects 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 230000003044 adaptive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
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- 230000033228 biological regulation Effects 0.000 description 1
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- 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
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- Dc-Dc Converters (AREA)
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Abstract
The invention discloses a soft-switch full-bridge direct-current transformer of a self-driven active auxiliary network. The soft-switch full-bridge direct-current transformer comprises a direct-current power supply Vin, a first inverter bridge arm, a second inverter bridge arm, an auxiliary bridge arm, an auxiliary transformer, an auxiliary capacitor, an auxiliary inductor, an isolation transformer and a rectifying filtering circuit. According to the invention, a phase shift control manner is adopted, due to additional arrangement of the active auxiliary network constituted by the auxiliary bridge arm, the auxiliary inductor, the auxiliary transformer and the auxiliary capacitor, the transformer can be used to realize the zero-voltage switching of a switch tube in a wider load range, in addition, the energy of the auxiliary network changes adaptively along with the change of a load, so that losses brought to the auxiliary network during heavy load are reduced, and meanwhile, the auxiliary bridge arm is simple to control.
Description
Technical field
The present invention relates to a kind of soft switching full-bridge direct-current converter of self-driven active auxiliary network.
Background technology
Phase shifting control soft switch full bridge converter is owing to combining the advantage of PWM switch and mode of resonance switch, in switching process, harmonic technology is utilized to realize no-voltage/Zero Current Switch, common PWM state is got back to again after switching process terminates, it is little that it has possessed switching loss simultaneously, the advantages such as the low and PWM pressure regulation of on-state loss, therefore in powerful DC converting occasion favored widely.
Traditional phase shifting control full-bridge converter of zero-voltage switch lagging leg when load is lighter can lose Sofe Switch, transformer leakage inductance or series resonance inductor can be increased for this reason, but this can bring the loss of Circuit Fault on Secondary Transformer duty ratio, cause needing to reduce the duty ratio that the transformer primary secondary turn ratio carrys out compensating missing, this makes again efficiency reduce.The increase of transformer leakage inductance or series resonance inductor has simultaneously caused Circuit Fault on Secondary Transformer parasitic oscillation.In order to reduce transformer leakage inductance or series resonance inductor, adding auxiliary network becomes a kind of trend.There is document at lagging leg active auxiliary network in parallel, in auxiliary induction, stored energy is helped lagging leg and is realized zero voltage switch, the control of auxiliary switch is simple, but the energy constant in full-load range in auxiliary network is constant, during heavier loads, the energy stored in transformer leakage inductance is satisfied realizes lagging leg ZVS condition, and auxiliary energy exists a large amount of loss, thus reduces efficiency.Although the energy having document can realize storing in active auxiliary network changes with the change of load current, reduce the conduction loss of auxiliary network, it is very complicated to the control of auxiliary switch, is difficult to realize.
Summary of the invention
The object of the invention is to the soft switching full-bridge direct-current converter that a kind of self-driven active auxiliary network is provided for the technological deficiency existing for above-mentioned converter, auxiliary switch controls simple, auxiliary network energy is adaptive change with the change of load, and the zero voltage switch of master power switch pipe can be realized in wider loading range, conduction loss reduces, and transducer effciency is improved.
The present invention for achieving the above object, adopts following technical scheme:
The soft switching full-bridge direct-current converter of the self-driven active auxiliary network of the present invention, comprises the first identical inverter bridge leg of DC power supply, structure and the second inverter bridge leg, isolating transformer and current rectifying and wave filtering circuit, wherein each inverter bridge leg comprises two switching tubes, two individual diodes and two parasitic capacitances, the drain electrode of the first switching tube respectively with the first body diode negative electrode, one end of first parasitic capacitance connects and composes the positive input terminal of inverter bridge leg, the source electrode of the first switching tube respectively with the first body diode anode, the other end of the first parasitic capacitance, the drain electrode of second switch pipe, second body diode negative electrode, one end of second parasitic capacitance connects and composes the output of inverter bridge leg, the source electrode of second switch pipe respectively with the second body diode anode, the other end of the second parasitic capacitance connects and composes the negative input end of inverter bridge leg, the positive pole of DC power supply connects the positive input terminal of the first inverter bridge leg and the second inverter bridge leg respectively, the negative pole of DC power supply connects the negative input end of the first inverter bridge leg and the second inverter bridge leg respectively, the input of the output termination current rectifying and wave filtering circuit of isolating transformer vice-side winding, isolating transformer former limit winding has a centre cap, it is characterized in that:
Also comprise the active auxiliary network be made up of auxiliary brachium pontis, auxiliary transformer, auxiliary capacitor and auxiliary induction; Wherein auxiliary brachium pontis comprises two auxiliary switches and two booster diodes, the drain electrode of the first auxiliary switch connects the positive input terminal of the auxiliary brachium pontis of negative electrode formation of the first booster diode, the output that the source electrode of the first auxiliary switch connects the anode of the first booster diode respectively, the drain electrode of the second auxiliary switch, the negative electrode of the second booster diode form auxiliary brachium pontis, the source electrode of the second auxiliary switch connects the negative input end of the auxiliary brachium pontis of anode formation of the second booster diode, and the both positive and negative polarity of DC power supply connects the positive-negative input end of auxiliary brachium pontis respectively.The center tap terminal of the input termination isolating transformer former limit winding of auxiliary transformer former limit winding, the input of the output termination auxiliary capacitor of auxiliary transformer former limit winding, auxiliary transformer comprises the identical vice-side winding of two numbers of turn, wherein the input of the first vice-side winding and auxiliary transformer former limit winding is the grid of termination first auxiliary switch of different name end, the source electrode of another termination first auxiliary switch of the first vice-side winding, the input of the second vice-side winding and auxiliary transformer former limit winding is the grid of termination second auxiliary switch of Same Name of Ends, the source electrode of another termination second auxiliary switch of the second vice-side winding, the negative pole of the output termination DC power supply of auxiliary capacitor, the output of input termination second inverter bridge leg of auxiliary induction, the output of the output termination service bridge arm of auxiliary induction.
The present invention discloses the soft switching full-bridge direct-current converter of self-driven active auxiliary network, it can realize the zero voltage switch of switching tube at wide loading range, and essentially eliminates the parasitic oscillation of Circuit Fault on Secondary Transformer.Its technical characteristics is compared with original technology, utilize the driving voltage of vice-side winding voltage as auxiliary switch of described auxiliary transformer, control simple, and auxiliary switch is operated in zero current turning-on condition, driving voltage duty ratio adaptive change with the change of load current of auxiliary switch, the energy being stored in auxiliary induction can the adaptive change with the change of load, delayed pipe can not only be helped to realize Sofe Switch when underloading is even unloaded, and reduce the conduction loss of auxiliary network when heavy duty, because isolating transformer leakage inductance value is little, the loss that output rectifying tube causes because of Reverse recovery reduces greatly, the voltage stress exporting rectifying tube also reduces thereupon, the efficiency of converter is improved.
Accompanying drawing explanation
Accompanying drawing 1 is traditional full-bridge converter of zero-voltage switch structural representation.
Accompanying drawing 2 is soft switching full-bridge direct-current converter electrical block diagrams of self-driven active auxiliary network of the present invention.
Accompanying drawing 3 is soft switching full-bridge direct-current converter key operation waveforms schematic diagrames of self-driven active auxiliary network of the present invention.
Accompanying drawing 4 ~ accompanying drawing 10 is each switch mode schematic diagrames of the soft switching full-bridge direct-current converter of self-driven active auxiliary network of the present invention.
Primary symbols title in above-mentioned accompanying drawing: V
in, supply voltage.Q
1~ Q
4, power switch pipe.C
1~ C
4, parasitic capacitance.D
1~ D
4, body diode.T
rA, auxiliary transformer.C
a, auxiliary capacitor.L
a, auxiliary induction.Q
a1~ Q
a2, auxiliary switch.D
a1, D
a2, booster diode.T
r, isolating transformer.L
k, isolating transformer leakage inductance.D
r1, D
r2, export rectifier diode.L
f, filter inductance.C
f, filter capacitor.R
ld, load.V
o, output voltage.V
aB, A and B point-to-point transmission voltage.
Embodiment
Be described in detail below in conjunction with the technical scheme of accompanying drawing to invention:
Shown in accompanying drawing 1 is traditional full-bridge converter of zero-voltage switch structural representation.
Shown in accompanying drawing 2 is the soft switching full-bridge direct-current converter electrical block diagram of self-driven active auxiliary network.By DC power supply V
in, two inverter bridge leg 1 and 2, auxiliary brachium pontis 3, isolating transformer 4, auxiliary transformer 5, auxiliary capacitor 6, auxiliary induction 7 and current rectifying and wave filtering circuits 8 form.Q
1~ Q
4four power switch pipes, D
1~ D
4switching tube Q respectively
1~ Q
4body diode, C
1~ C
4switching tube Q respectively
1~ Q
4parasitic capacitance, T
rAauxiliary transformer, n
athe former secondary turn ratio of auxiliary transformer, L
aauxiliary induction, C
aauxiliary capacitor, T
risolating transformer, L
kthe leakage inductance of isolating transformer, Q
a1~ Q
a2, auxiliary switch, D
a1, D
a2booster diode, D
r1, D
r2export rectifier diode, L
foutput inductor, C
foutput filter capacitor, R
ldfor load.This converter adopts phase shifting control, switching tube Q
4and Q
2lag behind switching tube Q respectively
1and Q
3a phase place, claims switching tube Q
1and Q
3first inverter bridge leg of composition is leading-bridge, switching tube Q
2and Q
4second inverter bridge leg of composition is then lagging leg.The drive singal of auxiliary switch is provided by auxiliary transformer two vice-side winding, and the drive singal of two auxiliary switches is contrary.Auxiliary capacitor C
avoltage be input voltage V
inhalf, i.e. v
cA=V
in/ 2, can V be seen as
inthe voltage source of/2.
Below with accompanying drawing 2 for main circuit structure, 3 ~ accompanying drawing 10 describes specific works principle of the present invention by reference to the accompanying drawings.Having 14 kinds of switch mode by accompanying drawing 3 known whole converter switch periods, is [t respectively
0-t
1], [t
1-t
2], [t
2-t
3], [t
3-t
4], [t
4-t
5], [t
5-t
6], [t
6-t
7], [t
7-t
8], [t
8-t
9], [t
9-t
10], [t
10-t
11], [t
11-t
12], [t
12-t
13], [t
13-t
14] wherein, [t
0-t
7] be the front half period, [t
7-t
14] be the later half cycle.Below the working condition of each switch mode is made a concrete analysis of.
Before analysis, first make the following assumptions: 1. all switching tubes and diode are ideal component; 2. filter inductance is enough large, and therefore secondary exports and can be equivalent to constant-current source, and all inductance, electric capacity are ideal element; 3. C
1=C
3=C
lead, C
2=C
4=C
lag.
1. switch mode 1 [t
0-t
1] [corresponding to accompanying drawing 4]
At t
0before moment, Q
1and Q
4conducting, Q
2and Q
3cut-off, primary current is similar to constant, v
aB=V
in, upper rectifier diode D
r1flow through whole load current, D
r2cut-off, former limit powering load.T
0moment turns off Q
1, current i
pfrom Q
1in transfer to C
1and C
3in branch road, v
aBby V
ingradually become zero, in this period, be stored in L
kand L
fin energy to C
1charging, gives C simultaneously
3electric discharge.At C
1and C
3buffering under, Q
1near zero voltage turns off.Because primary current is similar to constant, at t
1moment, C
3voltage linear drop to zero, Q
3anti-paralleled diode D
3nature conducting, Q
3no-voltage can be realized open-minded.The duration of this mode can be expressed as:
Wherein: K is the former secondary turn ratio of isolating transformer
2. switch mode 2 [t
1-t
2] [corresponding to accompanying drawing 5]
D
3after conducting, open Q
3, Q
1and Q
3dead Time t between drive singal
d (lead)> t
01.A point current potential drops to zero, so v
aB=0, former limit does not provide energy to load.Now auxiliary transformer vice-side winding voltage is V
in/ 2n
a, auxiliary switch Q
a1grid source electrode bears forward voltage V
in/ 2n
aand conducting, auxiliary induction electric current is zero before this, under the buffering of auxiliary induction, and now auxiliary switch Q
a1approximate zero current turning-on, auxiliary switch Q
a2grid source electrode bears reverse voltage-V
in/ 2n
aand end, now i
lastart from scratch increase, auxiliary induction electric current can be expressed as:
T
2moment, auxiliary induction L
athe energy stored can be expressed as:
In formula: D is circuit working duty ratio, T
srepresent switch periods.
As can be seen from the above equation, auxiliary induction L
athe energy stored depends on the size of auxiliary induction, input voltage and circuit working duty ratio D.The energy that auxiliary induction stores and load current have certain relation, when load current reduces, circuit working duty ratio D is also along with reduction, and the energy that auxiliary induction stores increases on the contrary, and the energy that therefore auxiliary induction stores can the adaptive change along with the change of load current.
3. switch mode 3 [t
2-t
3] [corresponding to accompanying drawing 6]
At t
2moment turns off Q
4, flow into the electric current of lagging leg to C
4charging, gives C simultaneously
2electric discharge, Q
4for zero voltage turn-off.Primary current declines, and is not enough to provide load current, secondary rectifying tube D
r1, D
r2conducting simultaneously, transformer primary, vice-side winding terminal voltage are all zero, v
aBdirectly be added in isolating transformer leakage inductance L
kon.Leakage inductance L
k, auxiliary induction L
awith electric capacity C
2, C
4resonant operational.Primary current i
p, auxiliary current i
la, and switching tube Q
4the voltage at two ends can be expressed as:
Wherein, I
lafor t
2the initial value of moment auxiliary current,
T
3moment, C
2on voltage drop be zero, C
4on voltage rise to V
in, D
2nature conducting.
4. switch mode 4 [t
3-t
4] [corresponding to accompanying drawing 7]
D
2after conducting, no-voltage can open Q
2.Q
2, Q
4dead Time t between drive singal
d (lag)> t
23.Q
2after opening, v
aB=-V
in.Now secondary two rectifying tubes still conducting simultaneously, therefore transformer primary side winding voltage is zero, input voltage V
indirectly be added in leakage inductance L
kon, primary current i
plinear reduction oppositely increases afterwards.And auxiliary induction now bears reverse voltage-V
in, auxiliary current i
lalinear reduction.Until t
4in the moment, auxiliary induction is not enough to provide primary current, D
2naturally turn off, Q
2begin to flow through electric current.
5. switch mode 5 [t
4-t
5] [corresponding to accompanying drawing 8]
Primary current i
preverse continuation increases, auxiliary current i
lacontinue to reduce, two rectifier diodes are conducting simultaneously still.Now primary current is provided jointly by DC power supply and auxiliary current.
6. switch mode 6 [t
5-t
6] [corresponding to accompanying drawing 9]
At t
5in the moment, primary current reaches the load current after conversion, i.e. i
p=-I
o/ K, D
r1turn off, D
r2flow through whole load current.Auxiliary current still linearly reduces.
7. switch mode 7 [t
6-t
7] [corresponding to accompanying drawing 10]
T
6in the moment, auxiliary induction electric current is linearly reduced to zero, and now DC power supply provides energy to load separately.
T
7moment, Q
3turn off, converter starts another half period, and its working condition is similar to above-mentioned half period [t
0-t
7], repeat no more here.
Can learn from above description, the soft switching full-bridge direct-current converter of the self-driven active auxiliary network that the present invention proposes has the advantage of following several respects:
1) auxiliary switch adopts self-driven scheme, controls simple, is easy to realize.
2) zero voltage switch of lagging leg switching tube can be realized in wide loading range, and the energy being stored in auxiliary network is with the adaptive change of load.
3) auxiliary network increased makes leakage inductance value very little, can effectively suppress to export the due to voltage spikes on rectifying tube and voltage oscillation, reduces the voltage stress exporting rectifier diode.
4) improve converter condition of work when underloading, improve the reliability of system, alleviate EMI.
Claims (1)
1. the soft switching full-bridge direct-current converter of self-driven active auxiliary network, comprises DC power supply (V
in), identical the first inverter bridge leg (1) of structure and the second inverter bridge leg (2), isolating transformer (4) and current rectifying and wave filtering circuit (8), wherein each inverter bridge leg comprises two switching tubes, two individual diodes and two parasitic capacitances, the drain electrode of the first switching tube respectively with the first body diode negative electrode, one end of first parasitic capacitance connects and composes the positive input terminal of inverter bridge leg, the source electrode of the first switching tube respectively with the first body diode anode, the other end of the first parasitic capacitance, the drain electrode of second switch pipe, second body diode negative electrode, one end of second parasitic capacitance connects and composes the output of inverter bridge leg, the source electrode of second switch pipe respectively with the second body diode anode, the other end of the second parasitic capacitance connects and composes the negative input end of inverter bridge leg, DC power supply (V
in) positive pole connect the positive input terminal of the first inverter bridge leg (1) and the second inverter bridge leg (2), DC power supply (V respectively
in) negative pole connect the negative input end of the first inverter bridge leg (1) and the second inverter bridge leg (2) respectively, the input of the output termination current rectifying and wave filtering circuit (8) of isolating transformer (4) vice-side winding, isolating transformer (4) former limit winding has a centre cap, it is characterized in that:
Also comprise the active auxiliary network be made up of auxiliary brachium pontis (3), auxiliary transformer (5), auxiliary capacitor (6) and auxiliary induction (7), wherein auxiliary brachium pontis (3) comprises two auxiliary switches and two booster diodes, the drain electrode of the first auxiliary switch connects the positive input terminal of the auxiliary brachium pontis of negative electrode formation of the first booster diode, the output that the source electrode of the first auxiliary switch connects the anode of the first booster diode respectively, the drain electrode of the second auxiliary switch, the negative electrode of the second booster diode form auxiliary brachium pontis, the source electrode of the second auxiliary switch connects the negative input end of the auxiliary brachium pontis of anode formation of the second booster diode, and the both positive and negative polarity of DC power supply connects the positive-negative input end of auxiliary brachium pontis respectively, the center tap terminal of input termination isolating transformer (4) the former limit winding of auxiliary transformer (5) former limit winding, the input of the output termination auxiliary capacitor (6) of auxiliary transformer (5) former limit winding, auxiliary transformer (5) comprises the identical vice-side winding of two numbers of turn, wherein the input of the first vice-side winding and auxiliary transformer former limit winding is the grid of termination first auxiliary switch of different name end, the source electrode of another termination first auxiliary switch of the first vice-side winding, the input of the second vice-side winding and auxiliary transformer former limit winding is the grid of termination second auxiliary switch of Same Name of Ends, the source electrode of another termination second auxiliary switch of the second vice-side winding, the output termination DC power supply (V of auxiliary capacitor (6)
in) negative pole, the output of input termination second inverter bridge leg of auxiliary induction (7), the output of the output termination service bridge arm of auxiliary induction (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110226471.0A CN102931843B (en) | 2011-08-09 | 2011-08-09 | Soft-switch full-bridge direct-current transformer of self-driven active auxiliary network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110226471.0A CN102931843B (en) | 2011-08-09 | 2011-08-09 | Soft-switch full-bridge direct-current transformer of self-driven active auxiliary network |
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| CN102931843B true CN102931843B (en) | 2015-02-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9124194B2 (en) * | 2013-06-03 | 2015-09-01 | Infineon Technologies Austria Ag | Methods and systems for a full-bridge voltage converting device |
| CN104917408A (en) * | 2014-12-12 | 2015-09-16 | 武汉绿鼎天舒科技发展有限公司 | Multifunctional desk lamp |
| CN104868752A (en) * | 2014-12-12 | 2015-08-26 | 武汉绿鼎天舒科技发展有限公司 | High-efficiency multifunctional lighting device |
| CN104600995A (en) * | 2014-12-30 | 2015-05-06 | 联合汽车电子有限公司 | Control method for full bridge synchronous rectifying circuit |
| CN105680699B (en) * | 2016-01-22 | 2018-02-23 | 东南大学 | Suitable for new energy direct current grid-connected High Efficiency DC Converter and its control method |
| EP4354719A1 (en) * | 2021-06-15 | 2024-04-17 | Thinking Power Technology (Shen Zhen) Limited | Dc-dc converter and power supply device |
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| CN1771655A (en) * | 2002-12-31 | 2006-05-10 | 阿波吉技术公司 | Adaptive resonant switching power system |
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