CN106329903A - Buffer circuit used for Buck converter - Google Patents
Buffer circuit used for Buck converter Download PDFInfo
- Publication number
- CN106329903A CN106329903A CN201611026074.8A CN201611026074A CN106329903A CN 106329903 A CN106329903 A CN 106329903A CN 201611026074 A CN201611026074 A CN 201611026074A CN 106329903 A CN106329903 A CN 106329903A
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- CN
- China
- Prior art keywords
- buffer circuit
- switch
- current
- zcs
- vds1
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0051—Diode reverse recovery losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/348—Passive dissipative snubbers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a buffer circuit used for a Buck converter and relates to the field of server power supply. The buffer circuit mainly comprises a Mos transistor V, an output filter inductor Lf, a coupling inductor Lc, a coupling inductance leakage inductor Llk, resonant capacitors Cr and Cs, a free-wheeling diode VD and auxiliary diodes VDs1, VDs2 and VDs3, wherein the Mos transistor V is a power tube, the Llk is connected with the VD in serial, and ZCS switch-off of the VD and ZCS switch-on of the VD are achieved; the Cr is connected with the two ends of the V in parallel through the VDs1, and ZVS switch-off is achieved; the Lc and the Lf are coupled, and the Cs is used for energy conservation; the Lc, the VDs1, the VDs2 and the VDs3 are used for energy recovery. Zero-current switch-on and zero-voltage switch-off of a switching tube are achieved, voltage, current and thermal stress are effectively reduced, reverse recovery current of a rectifier diode is suppressed, and conversion efficiency of the Buck converter is improved.
Description
Technical field
The present invention relates to server for electrical domain, a kind of buffer circuit for Buck changer.
Background technology
Buck changer is also referred to as decompression transducer, series voltage stabilizing Switching Power Supply and three-terminal switch type lowering and stabilizing blood pressure power supply,
It it is a kind of output voltage single tube not isolated DC converter less than input voltage.Buck changer specifically include that switch element,
Diode, inductance, electric capacity and feedback control loop.Along with the development of power technology, high efficiency, high power density Buck changer
Through becoming a kind of trend.Hard switching technology switching loss when HF switch is relatively big, reduces the efficiency of changer, electromagnetic interference
More serious.For solving this problem, the present invention proposes a kind of buffer circuit for Buck changer.
Summary of the invention
The present invention is directed to demand and the weak point of current technology development, it is provided that a kind of buffering electricity for Buck changer
Road.
A kind of buffer circuit for Buck changer of the present invention, solves the technical scheme that above-mentioned technical problem uses
As follows: described a kind of buffer circuit for Buck changer, it mainly includes Mos pipe V, output inductor Lf, coupling electricity
Sense Lc, coupling inductance leakage inductance Llk, resonant capacitance Cr、Cs, fly-wheel diode VD and booster diode VDs1、VDs2、VDs3, wherein,
Mos pipe V is power tube, LlkConnect with VD, it is achieved the ZCS of VD turns off and the ZCS of V is open-minded；CrPass through VDs1It is parallel to V two ends, real
Its ZVS existing turns off；LcAnd LfIt is coupled, CsChange for energy；LcAnd VDs1、VDs2、VDs3Energy has been assisted to recover.
Preferably, described buffer circuit is provided with a voltage source Uin。
Preferably, described buffer circuit also includes electric capacity Cf, resistance Rf,Cf、RfComposition parallel circuit, this parallel circuit one
End and output inductor LfConnect.
A kind of buffer circuit for Buck changer of the present invention compared with prior art has the beneficial effect that
The specific design method of the resonating device parameter of this buffer circuit, has widened the duty cycle range that can realize Sofe Switch；This delays
Rush zero current turning-on and the zero voltage turn-off of circuit realiration switching tube, effectively reduce voltage, electric current and thermal stress；Suppress whole
The reverse recovery current of stream diode, improves the conversion efficiency of Buck changer；Further, this circuit structure is simple, it is easy to set
Meter and realization.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of described buffer circuit；
Accompanying drawing 2 is coupling inductance schematic equivalent circuit；
Accompanying drawing 3 is V and VD voltage and current simulation waveform.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, to this
Bright described a kind of buffer circuit for Buck changer further describes.
Embodiment:
Buffer circuit described in the present embodiment, for Buck changer, as shown in Figure 1, it mainly includes Mos pipe V, output
Filter inductance Lf, coupling inductance Lc, coupling inductance leakage inductance Llk, resonant capacitance Cr、Cs, fly-wheel diode VD and booster diode
VDs1、VDs2、VDs3, wherein, Mos pipe V is power tube, LlkConnect with VD, it is achieved the ZCS of VD turns off and the ZCS of V is open-minded；CrLogical
Cross VDs1It is parallel to V two ends, it is achieved its ZVS turns off；LcAnd LfIt is coupled, CsChange for energy；LcAnd VDs1、VDs2、
VDs3Energy has been assisted to recover.Described ZCS is Zero Current Switch, and zero current switch, ZVS are ZVT,
zero voltage switch。
As shown in Figure 1, described buffer circuit is provided with a voltage source Uin, power for buffer circuit；Meanwhile, described
Buffer circuit also includes electric capacity Cf, resistance Rf,Cf、RfComposition parallel circuit, this parallel circuit one end and output inductor LfEven
Connect.Described LcAnd LfIt is coupled, when Mos pipe V turns on and off, LcA voltage positively and negatively can be equivalent to
Source, respectively Uon, Uoff, thus realize ZCS and ZVS, widen the duty cycle range realizing Sofe Switch.As shown in Figure 2.
When being embodied as, in conjunction with accompanying drawing 1,2, the present invention is described in detail:
1) when Mos pipe V turns off, owing to there is Cr, have quite a few electric current from CrFlow through, effectively reduce the pass of Mos pipe
Breakdown consumes；
2)LcAnd LfIt is coupled, for reducing the time opening buffering, increases L as far as possiblecTurn ratio n, according to simulation result
N=1/8 is chosen in analysis；
3) when Mos pipe V opens, owing to there is Llk, the Mos tube current rate of climb is limited, it is possible to realize ZCS open-minded；If
Mos tube voltage is at service time tonInternal linear is reduced to zero, then the turn-on consumption W of Von=Uin 2ton 2/(24Llk), open for reducing
Logical loss, it is necessary to increase Llk, for taking into account switching loss and realizing Sofe Switch duty cycle range, LlkTake optimization, T need to be metr_on
≤DminTs, Tr_off≤(1-Dmax)Ts, in formula, D is dutycycle.Work as i=IminTime, Tr_offMaximum, is buffer circuit turn off process
The worst condition of persistent period；Llk(max)=k2Ts 2/(4π2Cropt), 0 ＜ k ＜ 1, C in formularoptFor CrOptimal value；
4) when Mos pipe V opens, VD electric current is gradually reduced, after electric current is reduced to zero, at UinAnd UonUnder common effect, instead
To increasing to current peak Irm, for reducing turn-on consumption as far as possible, the reverse recovery current of suppression diode, then Llk(min)=(Uin+
Uon)·trr/Irm, wherein trrFor reverse recovery time of diode, LlkValue must be at Llk(min)With Llk(max)Between.
So can complete the design of described buffer circuit resonating device parameter.
Building the Buck changer phantom of a band coupling inductance formula passive lossless snubber circuit below, simulation parameter sets
For: Uin=300V, Lf=160 μ H, Lc=8.6 μ H, n=1/8, Llk=4.2 μ H, Cr=22nF, Cs=220nF.Such as Fig. 3 a, b, c
Shown in, when dutycycle D is 0.96,0.5,0.1, the Sofe Switch all achieving V in the widest duty cycle range runs.D=0.5
Time VD turn on and off the voltage of moment, current simulations waveform, VD also achieves Sofe Switch, without reverse-recovery problems.
Above-mentioned detailed description of the invention is only the concrete case of the present invention, and the scope of patent protection of the present invention includes but not limited to
Above-mentioned detailed description of the invention, any that meet claims of the present invention and any person of an ordinary skill in the technical field
The suitably change being done it or replacement, all should fall into the scope of patent protection of the present invention.
Claims (3)
1. the buffer circuit for Buck changer, it is characterised in that it mainly includes Mos pipe V, output inductor Lf、
Coupling inductance Lc, coupling inductance leakage inductance Llk, resonant capacitance Cr、Cs, fly-wheel diode VD and booster diode VDs1、VDs2、
VDs3, wherein, Mos pipe V is power tube, LlkConnect with VD, it is achieved the ZCS of VD turns off and the ZCS of V is open-minded；CrPass through VDs1In parallel
In V two ends, it is achieved its ZVS turns off；LcAnd LfIt is coupled, CsChange for energy；LcAnd VDs1、VDs2、VDs3Auxiliary completes
Energy recovers.
A kind of buffer circuit for Buck changer, it is characterised in that in described buffer circuit
It is provided with a voltage source Uin。
A kind of buffer circuit for Buck changer, it is characterised in that described buffer circuit is also
Including electric capacity Cf, resistance Rf,Cf、RfComposition parallel circuit, this parallel circuit one end and output inductor LfConnect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026074.8A CN106329903A (en) | 2016-11-18 | 2016-11-18 | Buffer circuit used for Buck converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026074.8A CN106329903A (en) | 2016-11-18 | 2016-11-18 | Buffer circuit used for Buck converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106329903A true CN106329903A (en) | 2017-01-11 |
Family
ID=57817041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611026074.8A Pending CN106329903A (en) | 2016-11-18 | 2016-11-18 | Buffer circuit used for Buck converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106329903A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943617A (en) * | 2019-12-11 | 2020-03-31 | 中国船舶工业系统工程研究院 | Circuit topological structure of double-switch type DC/DC converter |
| CN112688557A (en) * | 2020-12-07 | 2021-04-20 | 珠海格力电器股份有限公司 | Buffer circuit, Buck circuit, switch converter and air conditioner |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
| CN112928913A (en) * | 2021-01-27 | 2021-06-08 | 苏州海鹏科技有限公司 | Buck conversion circuit and lossless absorption circuit thereof |
-
2016
- 2016-11-18 CN CN201611026074.8A patent/CN106329903A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 房玲等: "一种软开关Buck电路的分析与设计", 《电力电子技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943617A (en) * | 2019-12-11 | 2020-03-31 | 中国船舶工业系统工程研究院 | Circuit topological structure of double-switch type DC/DC converter |
| CN110943617B (en) * | 2019-12-11 | 2022-04-19 | 中国船舶工业系统工程研究院 | Circuit topological structure of double-switch type DC/DC converter |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
| CN112688557A (en) * | 2020-12-07 | 2021-04-20 | 珠海格力电器股份有限公司 | Buffer circuit, Buck circuit, switch converter and air conditioner |
| CN112928913A (en) * | 2021-01-27 | 2021-06-08 | 苏州海鹏科技有限公司 | Buck conversion circuit and lossless absorption circuit thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170111 |
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| WD01 | Invention patent application deemed withdrawn after publication |