CN104852590B - A kind of new three-level LLC resonance inverter - Google Patents
A kind of new three-level LLC resonance inverter Download PDFInfo
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- CN104852590B CN104852590B CN201510289462.4A CN201510289462A CN104852590B CN 104852590 B CN104852590 B CN 104852590B CN 201510289462 A CN201510289462 A CN 201510289462A CN 104852590 B CN104852590 B CN 104852590B
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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
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- 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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- 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
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Abstract
A kind of new three-level LLC resonance inverter, including input derided capacitors, switch bridge arm, resonator, transformer and the current rectifying and wave filtering circuit being sequentially connected；Input derided capacitors are made up of two electric capacity being connected in series, and the other end of two electric capacity is connected with the positive pole of power supply respectively；The switch bridge arm is to be sequentially connected in series company by the hourglass source electrode of four switching tubes with body diode, hourglass source electrode positioned at the switching tube at switch bridge arm two ends is connected with the positive pole and negative pole of power supply respectively, and the intermediate connection point of middle two switching tubes is connected with the intermediate connection point of two electric capacity；Resonator is sequentially connected in series by inductance, electric capacity and magnetizing inductance, and the inductance other end is connected with the intermediate connection point of first switch pipe and second switch pipe, and the magnetizing inductance other end is connected with the intermediate connection point of the 3rd switching tube and the 4th switching tube；The primary side of transformer is connected in parallel with magnetizing inductance, and secondary is connected with the input of current rectifying and wave filtering circuit；This invention simplifies circuit structure, power device is reduced, cost is reduced, system reliability is improved.
Description
Technical field
The present invention relates to a kind of controlled resonant converter, and in particular to a kind of new three-level LLC resonance inverter.
Background technology
Controlled resonant converter has switching frequency height, small switching loss, efficiency high, light weight, small volume, EMI noise is small, open
Close the advantages of stress is small.There is LLC resonant converter primary side metal-oxide-semiconductor easily to realize full-load range ZVS, and secondary diode is easily realized
ZCS, resonant inductance and transformer easily realize the advantages of magnetic is integrated, are widely used in recent years.Meanwhile, to solve high input
The high problem of primary metal-oxide-semiconductor voltage stress, three level are incorporated into LLC converters under voltage occasion.Traditional three-level LLC is humorous
The converter that shakes needs Clamp-on diodes of Yin Ru that metal-oxide-semiconductor voltage stress is restricted into input voltage half to realize, can so select
With the metal-oxide-semiconductor of relative low voltage specification.The introducing of Clamp-on diodes of Dan adds cost, while circuit is more complicated.
The content of the invention
In order to solve the problem of above-mentioned prior art is present, it is an object of the invention to provide a kind of new three-level LLC
Controlled resonant converter, by the control to each switching tube in converter, makes full use of switching tube in topological circuit in control process
Body diode realizes switch tube both end voltage Clamp-on, reaches the purpose of reduction switch tube voltage stress；With traditional three level
LLC circuit topologies are compared, the circuit topological structure Du Li Clamp-on diodes, the electricity fewer than traditional three-level LLC circuit
Road simplifies circuit structure to a certain extent, reduces power device, cost is reduced on the whole, improves system reliable
Property.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of new three-level LLC resonance inverter, including be sequentially connected input derided capacitors 1, switch bridge arm 2, humorous
Shake chamber 3, transformer 4 and current rectifying and wave filtering circuit 5；The input derided capacitors 1 are by the electricity of the first electric capacity C1 being connected in series and second
Hold C2 to constitute, the first electric capacity C1 and the second electric capacity C2 other end are connected respectively with the positive pole and negative pole of power supply respectively；It is described
It is by the first switch pipe MOS1 with body diode, second switch pipe MOS2, the 3rd switching tube MOS3 and the 4th to switch bridge arm 2
Switching tube MOS4 hourglass source electrode is sequentially connected in series, and the drain electrode and the 4th positioned at the first switch pipe MOS1 at switch bridge arm two ends is opened
The source electrode for closing pipe MOS4 is connected with the positive pole and negative pole of power supply respectively, the second switch pipe MOS2 and the 3rd switching tube MOS3
Intermediate connection point be connected with the first electric capacity C1 and the second electric capacity C2 intermediate connection point in input derided capacitors 1；It is described humorous
The chamber 3 that shakes is to be sequentially connected in series resonance circuit by inductance Lr, electric capacity Cr and magnetizing inductance Lm, and the other end of the inductance Lr is with opening
The first switch pipe MOS1 closed in bridge arm 2 is connected with second switch pipe MOS2 intermediate connection point, the magnetizing inductance Lm's
The other end is connected with the 3rd switching tube MOS3 and the 4th switching tube MOS4 intermediate connection point in switch bridge arm 2；It is described to become
The primary side of depressor 4 is connected in parallel with the magnetizing inductance Lm in resonator 3, the secondary of transformer 4 and the input of current rectifying and wave filtering circuit 5
End is connected；The current rectifying and wave filtering circuit 5 be carried out by the way of general rectifier bridge and output end parallel filtering electric capacity it is whole
Stream filtering.
The driving process of each switching tube is：It is a switch periods between t1 to T, in the positive half cycle of switch periods, t1
Moment, first switch pipe MOS1 and the 4th switching tube MOS4 were simultaneously turned on, and second switch pipe MOS2 and the 3rd switching tube MOS3 are in
Off state, at the t2 moment, the 4th switching tube MOS4 is first turned off, and first switch pipe MOS1 continues to turn on, until the t3 moment first
Switching tube MOS1 is turned off, and resonance current is by continuous current circuit afterflow in t3~t4 moment, circuit, while resonance current slowly subtracts
Small, until being reduced to zero, resonance current starts reversely, is that negative half-cycle is ready, the positive half period entirely switched terminates；
The negative half-cycle of switch periods, t4 moment second switch pipe MOS2 and the 3rd switching tube MOS3 are simultaneously turned on, first switch pipe
MOS1 and the 4th switching tube MOS4 are off state, at the t5 moment, and the 3rd switching tube MOS3 is first turned off, second switch pipe MOS2
Continue to turn on, until t6 moment second switch pipes MOS2 shut-offs, resonance current passes through continuous current circuit in t6~T moment, circuit
Afterflow, while resonance current slowly increases, until increasing to zero, resonance current starts reversely, is the positive half period in next cycle
It is ready, the negative half-cycle entirely switched terminates；So circulation.
The present invention compared with prior art, has the following advantages that：
Relative to traditional half-bridge three-level LLC circuits, invention removes Clamp-on diodes of two Du Li, make circuit
In the shut-off of each switching tube when the voltage stress that is born it is identical with the effect reached using Clamp-on diodes of Du Li.
Brief description of the drawings
Fig. 1 is three-level LLC converter topological circuit.
Fig. 2 is each metal-oxide-semiconductor drive waveforms in LLC converter topology circuits.
Fig. 3 is switch positive half period t1~t2 moment current flow diagrams.
Fig. 4 is switch positive half period t2~t3 moment current flow diagrams.
Fig. 5 is switch positive half period t3~t4 moment current flow diagrams.
Fig. 6 is the reverse current flow diagrams before of switch negative half-cycle t4~t5 moment resonance current.
Fig. 7 is the reverse current flow diagrams afterwards of switch negative half-cycle t4~t5 moment resonance current.
Fig. 8 is switch negative half-cycle t5~t6 moment current flow diagrams.
Fig. 9 is switch negative half-cycle t6~T moment resonance current flow graphs.
Figure 10 is current flow diagrams before switching next start time in cycle resonance current reversely.
Figure 11 is key node oscillogram.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in drawings, a kind of new three-level LLC resonance inverter of the present invention, including the input partial pressure electricity being sequentially connected
Hold 1, switch bridge arm 2, resonator 3, transformer 4 and current rectifying and wave filtering circuit 5；The input derided capacitors 1 by be connected in series the
One electric capacity C1 and the second electric capacity C2 compositions, the first electric capacity C1 and the second electric capacity C2 other end is respectively with the positive pole of power supply and bearing
Pole is connected respectively；The switch bridge arm 2 is by the first switch pipe MOS1 with body diode, second switch pipe MOS2, the 3rd
Switching tube MOS3 and the 4th switching tube MOS4 hourglass source electrode are sequentially connected in series, the first switch pipe positioned at switch bridge arm two ends
MOS1 drain electrode and the 4th switching tube MOS4 source electrode are connected with the positive pole and negative pole of power supply respectively, the second switch pipe
The centre of MOS2 and the 3rd switching tube MOS3 intermediate connection point and the first electric capacity C1 and the second electric capacity C2 in input derided capacitors 1
Tie point is connected；The resonator 3 is to be sequentially connected in series resonance circuit by inductance Lr, electric capacity Cr and magnetizing inductance Lm, institute
The inductance Lr other end is stated with the first switch pipe MOS1 in switch bridge arm 2 and second switch pipe MOS2 intermediate connection point to be connected
Connect, the other end of the magnetizing inductance Lm and the 3rd switching tube MOS3 in switch bridge arm 2 and the 4th switching tube MOS4 centre
Tie point is connected；The primary side of the transformer 4 is connected in parallel with the magnetizing inductance Lm in resonator 3, the secondary of transformer 4 with
The input of current rectifying and wave filtering circuit 5 is connected；The current rectifying and wave filtering circuit 5 is using general rectifier bridge and output end parallel connection filter
The mode of ripple electric capacity carries out rectifying and wave-filtering.
As shown in Fig. 2 being a switch periods between t1 to T, in the positive half cycle of switch periods, t1 moment first switches
Pipe MOS1 and the 4th switching tube MOS4 are simultaneously turned on, and second switch pipe MOS2 and the 3rd switching tube MOS3 are off state,
T2 moment, the 4th switching tube MOS4 is first turned off, and first switch pipe MOS1 continues to turn on, until t3 moment first switch pipes MOS1 is closed
Disconnected, resonance current is by continuous current circuit afterflow in t3~t4 moment, circuit, while resonance current slowly reduces, until reducing
It is zero, resonance current starts reversely, is that negative half-cycle is ready, the positive half period entirely switched terminates；In switch periods
Negative half-cycle, t4 moment second switch pipe MOS2 and the 3rd switching tube MOS3 are simultaneously turned on, and first switch pipe MOS1 and the 4th is opened
Close pipe MOS4 and be off state, at the t5 moment, the 3rd switching tube MOS3 is first turned off, second switch pipe MOS2 continues to turn on, directly
To t6 moment second switch pipes MOS2 shut-offs, resonance current is by continuous current circuit afterflow in t6~T moment, circuit, while humorous
The electric current that shakes slowly increases, and until increasing to zero, resonance current starts reversely, is that the positive half period in next cycle is ready, whole
The negative half-cycle of individual switch terminates.Whole circuit is exactly according under this working method in a switch periods constantly circulation
Go.
The course of work and current direction of the circuit topology in a switch periods：
(fm is resonant inductance Lr, resonant capacitance Cr, static exciter inductance Lm series resonance by taking fm ＜ fs ＜ fr as an example
Frequency,)；Fr be resonant inductance Lr, resonant capacitance Cr series resonance frequency,) should
The LLC circuits course of work mainly includes following critical stage：
(a) in the positive half period of switch periods
As shown in figure 3, at the t1 moment, first switch pipe MOS1 and the 4th switching tube MOS4 are simultaneously turned on, second switch pipe
MOS2 and the 3rd switching tube MOS3 are off state, and now the electric current in circuit flows successively through first switch pipe MOS1, resonance
Chamber 3, the 4th switching tube MOS4, DC input voitage Vin are added on resonator 3, resonant element inductance Lr, electric capacity Cr and excitation electricity
Feel Lm and carry out resonance, transmit energy to transformer T secondary, now second switch pipe MOS2 and the 3rd switching tube MOS3 two ends institute
The voltage born is respectively the first electric capacity C1 and the voltage at the second electric capacity C2 two ends, i.e. Vin/2 in input derided capacitors 1.
At the t2 moment, the 4th switching tube MOS4 is first turned off, and first switch pipe MOS1 continues to turn on, and the 4th switching tube MOS4 is closed
Have no progeny, resonance current is charged to the 4th switching tube MOS4 junction capacity, the 3rd switching tube MOS3 junction capacity is discharged, and discharge and recharge is completed
Afterwards, the 3rd switching tube MOS3 junction capacity terminal voltage is 0V, and the 3rd switching tube MOS3 the 3rd body diode D3 begins to turn on afterflow,
4th switching tube MOS4 drain-source voltage Bei Clamp-on are the voltage at the second electric capacity C2 two ends, i.e. Vin/2, until t3 moment first switches
Pipe MOS1 turn off, from the current direction in t2~t3 moment circuits as shown in figure 4, electric current flow successively through first switch pipe MOS1,
Resonator 3, the 3rd switching tube MOS3 the 3rd body diode D3, the first electric capacity C1.
After first switch pipe MOS1 shut-offs, resonance current charges to first switch pipe MOS1 junction capacity, to second switch pipe
MOS2 junction capacity is discharged, after the completion of discharge and recharge, and second switch pipe MOS2 junction capacity terminal voltage is 0V, the of second switch pipe MOS2
Two body diode D2 turn on afterflow, first switch pipe MOS1 drain-source voltages by Clamp-on in C1 both end voltages, i.e. Vin/2, until t4
Moment the 3rd switching tube MOS3 and second switch pipe MOS2 body diode afterflow terminates, and the positive half period of switching tube terminates, from
Current direction in t3~t4 moment circuits is as shown in figure 5, electric current flows successively through resonator 3, the 3rd of the 3rd switching tube MOS3 the
Body diode D3, second switch pipe MOS2 the second body diode D2, the first electric capacity C1.
(b) in the negative half-cycle of switch periods
At the t4 moment, second switch pipe MOS2 and the 3rd switching tube MOS3 are simultaneously turned on, first switch pipe MOS1 and the 4th
Switching tube MOS4 is turned off, and now resonance current continues to reduce, and the current direction in circuit is opened as shown in fig. 6, flowing successively through the 3rd
Pipe MOS3, second switch pipe MOS2, resonator 3 are closed, until resonance current is reduced to zero；Hereafter, resonance current is reverse, in circuit
Current direction as shown in fig. 7, electric current flows successively through second switch pipe MOS2, the 3rd switching tube MOS3, resonator 3.The process
In, first switch pipe MOS1 and the 4th switching tube MOS4 are off state, and the voltage point of its switching tube drain-source interpolar is not by Clamp-on
Position is the first electric capacity C1 and the second electric capacity C2 terminal voltage, is Vin/2.
At the t5 moment, the 3rd switching tube MOS3 is first turned off, and second switch pipe MOS2 continues to turn on, and the 3rd switching tube MOS3 is closed
Have no progeny, resonance current is charged to the 3rd switching tube MOS3 junction capacity, the 4th switching tube MOS4 junction capacity is discharged, and discharge and recharge is completed
Afterwards, the 4th switching tube MOS4 junction capacity terminal voltage is 0V, and the 4th switching tube MOS4 the 4th body diode D4 begins to turn on afterflow,
3rd switching tube MOS3 drain-source voltage Bei Clamp-on are the voltage at the second electric capacity C2 two ends, i.e. Vin/2, until t6 moment second switches
Pipe MOS2 turn off, from the current direction in t5~t6 moment circuits as shown in figure 8, electric current flow successively through second switch pipe MOS2,
Second electric capacity C2, the 4th switching tube MOS4 the 4th body diode D4, resonator 3.
After second switch pipe MOS2 shut-offs, resonance current charges to second switch pipe MOS2 junction capacity, to first switch pipe
MOS1 junction capacity is discharged, after the completion of discharge and recharge, and first switch pipe MOS1 junction capacity terminal voltage is 0V, the of first switch pipe MOS1
One body diode D1 begins to turn on afterflow, second switch pipe MOS2 drain-source voltages by Clamp-on in the first electric capacity C1 both end voltages, i.e.,
Vin/2, until T moment first switch pipe MOS1 and the 4th switching tube MOS4 body diode afterflow terminate, negative the half of switching tube
End cycle, from the current direction in t6~T moment circuits as shown in figure 9, electric current flows successively through resonator 3, first switch pipe
MOS1 the first body diode D1, the first electric capacity C1 and the second electric capacity C2, the 4th switching tube MOS4 the 4th body diode D4.
In the beginning of next switch periods, first switch pipe MOS1 and the 4th switching tube MOS4 drivings are enabled, resonance current
Continue to increase, flowed into from the 4th switching tube MOS4 source electrodes, first switch pipe MOS1 drain electrode outflows, until resonance current is increased to
Zero, now the current flow diagrams in circuit are as shown in Figure 10；Hereafter, resonance current is reverse, current flow diagrams such as Fig. 3 in circuit
It is shown, the positive half cycle of next switch periods is again introduced into, so constantly circulation is gone down.
In the circuit course of work, key node waveform as shown in figure 11, is followed successively by from top to bottom：First switch pipe MOS1
Drive waveforms, first switch pipe MOS1 pipe drain-source voltage stress waves, primary winding voltage waveform, first switch pipe
MOS1 current waveforms, the 3rd switching tube MOS3 current waveforms, the current waveform of resonator 3.
Claims (1)
1. a kind of new three-level LLC resonance inverter, including be sequentially connected input derided capacitors (1), switch bridge arm (2),
Resonator (3), transformer (4) and current rectifying and wave filtering circuit (5)；The input derided capacitors (1) are by the first electric capacity for being connected in series
(C1) constituted with the second electric capacity (C2), the other end of the first electric capacity (C1) and the second electric capacity (C2) respectively with the positive pole of power supply and
Negative pole is connected respectively；The switch bridge arm (2) is by the first switch pipe (MOS1) with body diode, second switch pipe
(MOS2), the hourglass source electrode of the 3rd switching tube (MOS3) and the 4th switching tube (MOS4) is sequentially connected in series, positioned at switch bridge arm two
The drain electrode of the first switch pipe (MOS1) at end and the source electrode of the 4th switching tube (MOS4) are connected with the positive pole and negative pole of power supply respectively
Connect, the intermediate connection point of the second switch pipe (MOS2) and the 3rd switching tube (MOS3) is with inputting first in derided capacitors (1)
Electric capacity (C1) is connected with the intermediate connection point of the second electric capacity (C2)；The resonator (3) be by inductance (Lr), electric capacity (Cr) and
Magnetizing inductance (Lm) is sequentially connected in series resonance circuit, and the other end and first in switch bridge arm (2) of the inductance (Lr) open
Close pipe (MOS1) with the intermediate connection point of second switch pipe (MOS2) to be connected, the other end and switch of the magnetizing inductance (Lm)
The 3rd switching tube (MOS3) in bridge arm (2) is connected with the intermediate connection point of the 4th switching tube (MOS4)；The transformer (4)
Primary side be connected in parallel with the magnetizing inductance (Lm) in resonator (3), the secondary of transformer (4) and current rectifying and wave filtering circuit (5)
Input is connected；The current rectifying and wave filtering circuit (5) is by the way of general rectifier bridge and output end parallel filtering electric capacity
Carry out rectifying and wave-filtering；It is characterized in that：The driving process of each switching tube is：It is a switch periods between t1 to T, in switch
The positive half cycle in cycle, t1 moment first switch pipes (MOS1) and the 4th switching tube (MOS4) are simultaneously turned on, second switch pipe
(MOS2) and the 3rd switching tube (MOS3) is off state, at the t2 moment, the 4th switching tube (MOS4) is first turned off, first switch
Manage (MOS1) to continue to turn on, until t3 moment first switch pipes (MOS1) shut-off, resonance current leads in t3~t4 moment, circuit
Continuous current circuit afterflow is crossed, while resonance current slowly reduces, until being reduced to zero, resonance current starts reversely, is negative half-cycle
It is ready, the positive half period entirely switched terminates；In the negative half-cycle of switch periods, t4 moment second switch pipes (MOS2) and
3rd switching tube (MOS3) is simultaneously turned on, and first switch pipe (MOS1) and the 4th switching tube (MOS4) are off state, in t5
Moment, the 3rd switching tube (MOS3) is first turned off, and second switch pipe (MOS2) continues to turn on, until t6 moment second switch pipes
(MOS2) turn off, resonance current is by continuous current circuit afterflow in t6~T moment, circuit, while resonance current slowly increases, directly
To increasing to zero, resonance current starts reversely, is that the positive half period in next cycle is ready, the negative half-cycle knot entirely switched
Beam；So circulation.
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| CN201510289462.4A CN104852590B (en) | 2015-05-29 | 2015-05-29 | A kind of new three-level LLC resonance inverter |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119496A (en) * | 2015-09-29 | 2015-12-02 | 燕山大学 | Wide input range three-level LLC resonant converter and level switching control method |
| CN105897000A (en) * | 2016-04-25 | 2016-08-24 | 陕西科技大学 | Phase shift compensation interleaved three-level LLC resonant converter |
| CN106026673A (en) * | 2016-07-05 | 2016-10-12 | 陕西科技大学 | Wide-scope input LLC resonance converter with high-voltage gain |
| US10833594B2 (en) | 2017-05-19 | 2020-11-10 | Infineon Technologies Austria Ag | System and method of controlling a power converter having an LC tank coupled between a switching network and a transformer winding |
| CN111525807B (en) * | 2020-04-13 | 2023-04-14 | 哈尔滨工业大学 | High-order LCLCLCL direct current converter based on harmonic optimization and parameter design method |
| CN112994499B (en) * | 2021-03-02 | 2022-03-29 | 济宁奥太电气有限公司 | Three-level half-bridge soft switch converter circuit, control system and control method thereof |
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| CN1387306A (en) * | 2001-03-29 | 2002-12-25 | 台达电子工业股份有限公司 | Tree-level switching transformer |
| CN101478238A (en) * | 2009-01-12 | 2009-07-08 | 浙江大学 | Three-level parallel resonance dc-dc current transformer |
| CN102611310A (en) * | 2012-03-09 | 2012-07-25 | 南京航空航天大学 | Magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter |
| CN204858982U (en) * | 2015-05-29 | 2015-12-09 | 特变电工西安电气科技有限公司 | Three level LLC resonant transformation wares |
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| JP5216260B2 (en) * | 2007-07-03 | 2013-06-19 | 株式会社日立メディコ | Multilevel inverter and magnetic resonance imaging apparatus using the same |
| US9077255B2 (en) * | 2013-01-11 | 2015-07-07 | Futurewei Technologies, Inc. | Resonant converters and methods |
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|---|---|---|---|---|
| CN1387306A (en) * | 2001-03-29 | 2002-12-25 | 台达电子工业股份有限公司 | Tree-level switching transformer |
| CN101478238A (en) * | 2009-01-12 | 2009-07-08 | 浙江大学 | Three-level parallel resonance dc-dc current transformer |
| CN102611310A (en) * | 2012-03-09 | 2012-07-25 | 南京航空航天大学 | Magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter |
| CN204858982U (en) * | 2015-05-29 | 2015-12-09 | 特变电工西安电气科技有限公司 | Three level LLC resonant transformation wares |
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