CN104201884B - A kind of Sofe Switch DC DC translation circuit - Google Patents
A kind of Sofe Switch DC DC translation circuit Download PDFInfo
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- CN104201884B CN104201884B CN201410468763.9A CN201410468763A CN104201884B CN 104201884 B CN104201884 B CN 104201884B CN 201410468763 A CN201410468763 A CN 201410468763A CN 104201884 B CN104201884 B CN 104201884B
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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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Abstract
The invention discloses a kind of Sofe Switch DC DC translation circuit, including direct-flow input end, DC output end.Direct-flow input end (Uin) positive polarity and load (R) between connect have main switch (S1) and filter inductance (L)；Main switch (S1) with the junction point of filter inductance (L) and direct-flow input end (Uin) negative polarity between connect have fly-wheel diode (D), inductance (Lr) and diode (D2) and electric capacity (C3) series arm, resistance (R) is in parallel with electric capacity (C)；Main switch (S1) in parallel there is electric capacity (C1), diode (D1), auxiliary switch (S2) and electric capacity C2In parallel；Main switch (S1) and auxiliary switch (S2) it is all Sofe Switch.Main switch (S1) it is that ZCS and ZVS opens and ZVS turns off, auxiliary switch (S2) it is that ZVS opens and ZVS turns off, fly-wheel diode (D) is that ZVS opens and ZCS turns off；Sofe Switch can be realized in the range of duty cycle adjustment.
Description
Technical field
The present invention relates to a kind of DC-DC conversion circuit, more particularly, to a kind of buck chopper translation circuit.
Background technology
Brushless direct current motor has the advantages that small volume, efficiency high, has been obtained for being widely applied in many fields.
In the more than ten years in past, the development of brshless DC motor be concentrated mainly on the research of control method and the design of topological structure and
In optimization, however, the translation circuit topological structure of most of brshless DC motor is all using hard switching technology, this is just corresponding
Lead to very big switching loss and electromagnetic interference, simultaneously in order that the volume of translation circuit reduces, it is unique for increasing switching frequency
Method, but this also brings loss to increase accordingly, and soft switch technique can solve these problems.Although designing various each
The soft switch conversion circuit of sample, such as ZVT resonance circuit, ZVT circuit, zero-current switching circuit etc., but
Be feature for brshless DC motor it is desirable to electric current is little, response is fast, and torque pulsation is steady, harmonic componentss are few, and loss is low, bears
Carry that excursion is big and duty cycle adjustment wide ranges etc. require, various soft switch conversion circuit have respective shortcoming, not
Brshless DC motor is used widely.ZVT quasi-resonance circuit (ZVS-QRC), although current stress is little,
It is that voltage stress is big, and voltage stress is proportional with load, it is only suitable for being applied to input voltage and load change model
Enclose narrow circuit.ZVT multi-resonant circuit (ZVS-MRC) although voltage stress is little, loading range width, but conducting damage
Consumption is larger., although voltage x current stress is little, loading range is big for resonance DC loop circuit (RDCLI), and its control principle is multiple
Miscellaneous, there is electromagnetic torque pulsation and the phenomenon of Torque ripple, and in output circuit, contain subharmonic.Zero voltage transition
Circuit (ZVT), resonant tank not on major loop although so can effectively reduce loss, but the selection to power tube
There is certain restriction.Zero-current switching circuit (ZCT), switch conduction and turn-off power loss all very littles, it is possible to achieve ZCS, electric current electricity
Compressive stress also very little, but the device that it uses is many, and control process is complicated.
Content of the invention
The technology solve problem of the present invention is：Feature for brushless direct current motor and the deficiency of translation circuit, provide
A kind of loss is low, efficiency high, the simple Sofe Switch DC-DC conversion circuit of control.
The present invention solves technical problem and be employed technical scheme comprise that：
Sofe Switch DC-DC conversion circuit of the present invention, including direct-flow input end and DC output end it is characterised in that direct current is defeated
Enter end (Uin) positive polarity and first switch pipe (S1) colelctor electrode, second switch pipe (S2) colelctor electrode be connected, first switch
Pipe (S1) and the first electric capacity (C1), the first diode (D1) in parallel, second switch pipe (S2) and the second electric capacity (C2) in parallel, inductance
(Lr) two ends and first switch pipe (S1) emitter stage and second switch pipe (S2) emitter stage be connected, the second diode (D2)
With the 3rd electric capacity (C3) and inductance (Lr) series connection, the first diode (D1) negative electrode and direct-flow input end (Uin) positive polarity be connected,
Second diode (D2) anode and the 3rd electric capacity (C3) be connected, the negative electrode of the 3rd diode (D) and first switch pipe (S1)
Emitter stage is connected, the anode of the 3rd diode (D) and direct-flow input end (Uin) negative polarity be connected, the two ends of inductance (L) and the
One switching tube (S1) emitter stage with load (R) be connected, the 4th electric capacity (C) with load (R) in parallel.
Sofe Switch DC-DC conversion circuit topological structure of the present invention is as shown in figure 1, do to the operation principle of the present invention below in detail
Thin description：
Process to simplify the analysis, first does basic assumption：
(1) translation circuit is operated in steady statue；
(2) all power switch, diode are all ideal component；
(3) inductance, electric capacity are preferable energy-storage travelling wave tube；
(4) input voltage is constant；
(5) output inductor sufficiently large so that the electric current flowing through filter inductance can regard constant current I as0；
(6) resonant inductance is far smaller than filter inductance；
In switch periods it is assumed that this circuit is operated under continuous operation mode, the present invention can be divided into 7 work shapes
State, the equivalent circuit diagram of its each working condition is as shown in Fig. 2 a 2g.
Working stage 1 [t0,t1]：In t0Before moment, switching tube S1、S2All in off state, its equivalent circuit is as schemed
Shown in 2a, inductance L passes through diode D afterflow, now, iS1=0, iS2=0, iLr=0, UC2=Uin.T=t0Moment, S1Conducting,
Due to the presence of inductance L, switching tube S1Electric current be restricted it is impossible to be mutated immediately, realize zero current passing, meanwhile, inductance Lr
In electric current iLrLinear rise.Because the value of inductance L is relatively large, its electric current iLApproximately constant, that is, have IL=I0, so main
Electric current in diode D is with iS1Rising and linear decline, iS1With iDIt is represented by：
This phase duration is：
In this stage switch pipe S1Zero current passing, i.e. switching tube S1Turn-on consumption is zero.
Working stage 2 [t1,t2]：T=t1Moment, iS1(t1)=I0, iD(t1)=0, its equivalent circuit as shown in Figure 2 b, two
Pole pipe D is zero-current switching.Hereafter, electric capacity C2With inductance LrThere is series resonance, resonant inductance LrElectric current and electric capacity C2End electricity
Pressure expression formula is as follows：
uC2(t)=Uincosω(t-t1) (5)
Wherein,
Work as UC2When being reduced to zero, LrOn electric current reach maximumNow electric capacity C2On energy storage all turn
Move on to resonant inductance LrOn, resonant inductance LrOn current increment △ ILrMeet following equation：
It is zero-current switching in this stage diode D, so diode D turn-off power loss is zero.
Working stage 3 [t2,t3]：Work as t=t2When, UC2Be reduced to zero, its equivalent circuit as shown in Figure 2 c, now auxiliary switch
Pipe S2Conducting be ZVS open.
In this stage switch pipe S2Open-minded for no-voltage, so switching tube S2Turn-on consumption be zero.
Working stage 4 [t3,t4]：In t=t3When, turn off switch S1, its equivalent circuit is as shown in Figure 2 d.
Now, from equivalent circuit diagram, electric capacity C1With master switch S1It is in parallel, and electric capacity C1The voltage at two ends is
Slow rising, so switch S1It is that ZVS turns off.
In this stage switch pipe S1It is that ZVS turns off, so switching tube S1Turn-off power loss is zero.
Working stage 5 [t4,t5]：In this stage, this circuit is identical with traditional BUCK circuit working state, and circuit leads to
Cross a switching tube S2It is operated, its equivalent circuit is as shown in Figure 2 e.
Working stage 6 [t5,t6]：Work as t=t5When, on-off switching tube S2, its equivalent circuit as shown in figure 2f, now starts
To electric capacity C2Charge, its terminal voltage slowly rises, so switching tube S2Approximately achieve ZVS to turn off.Work as UC1(t)+UC3(t)=Uin
When, diode D2It is that ZVS opens.In t=t6When, UC1(t6)=Uin, UC3(t6)=0, diode D2Achieve ZVS to turn off.
In this stage switch pipe S2Turn off for ZVS, so switching tube S2Turn-off power loss is zero, simultaneously diode D2It is zero
Voltage turns on and off, so diode D2Turn on and off loss be also zero.
Working stage 7 [t6,t7]：T=t6When, C1、C2、C3Both end voltage be all zero, its equivalent circuit as shown in Figure 2 g,
It is achieved that ZVS opens, this stage is identical with traditional BUCK circuitry operating conditions for now sustained diode afterflow.T=t7
When, switching tube S2It is again turned on, initially enter next switch periods circulation.
Open for ZVS in this stage diode D, so diode D turn-on consumption is zero.
It is an advantage of the invention that while realizing circuit function, all power switch pipes are Sofe Switch, greatly drop
Low switching tube turn on and off loss, and the electric current of power switch pipe, voltage stress are less, the conduction loss of switching tube
Also it is reduced, this circuit structure is simple, easy to control simultaneously, Sofe Switch can be realized in the range of whole duty cycle adjustment.
Brief description
Fig. 1 is the topological structure of Sofe Switch DC-DC conversion circuit of the present invention；
Fig. 2 a is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 1 of the present invention；
Fig. 2 b is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 2 of the present invention；
Fig. 2 c is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 3 of the present invention；
Fig. 2 d is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 4 of the present invention；
Fig. 2 e is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 5 of the present invention；
Fig. 2 f is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 6 of the present invention；
Fig. 2 g is the equivalent circuit diagram of Sofe Switch DC-DC conversion circuit working stage 7 of the present invention；
Fig. 3 is main switch S in Sofe Switch DC-DC conversion circuit of the present invention1And auxiliary switch S2Drive signal waveform
Figure；
Specific embodiment
Sofe Switch DC-DC conversion circuit of the present invention preferably embodiment is as shown in figure 1, include direct-flow input end, direct current
Outfan, is provided with positive pole circuit and negative pole circuit between direct-flow input end and DC output end, on positive pole circuit, series connection has master
Switching tube S1With filter inductance L, auxiliary switch S2In parallel has electric capacity C2, main switch S1In parallel has diode D1, lead and open
Close pipe S1Junction point and direct-current input power supplying U with filter inductance LinNegative polarity between connect have sustained diode, afterflow
The in parallel series arm being made up of with filter capacitor C filter inductance L of diode D, resonant inductance LrWith diode D2With electric capacity C3
The series arm of composition.Main switch S1With auxiliary switch S2It is respectively Sofe Switch.
In FIG, L is filter inductance, LrIt is resonant inductance, and L>>Lr；S1It is main switch, S2It is auxiliary switch, D
It is fly-wheel diode, R is the steady-state equivalent load of brshless DC motor.Main switch S in this topological structure1Achieve ZCS
(Zero Current Switch) and ZVS (ZVT) open and ZVS turns off, auxiliary switch S2Achieve ZVS to open and ZVS pass
Disconnected, sustained diode achieves ZVS and opens and ZCS shutoff.
As shown in figure 3, respectively main switch S1With auxiliary switch S2Drive signal waveform, as we know from the figure master open
Close pipe S1Auxiliary switch S in advance2Open, be auxiliary switch S2ZVS open create conditions, as main switch S1During unlatching,
Due to there being filter inductance L and resonant inductance LrPresence, main switch S1Electric current can not be mutated immediately, so main switch S1
Open for ZCS；As resonant inductance LrWith resonant capacitance C2When there is resonance, this moment auxiliary switch S2Both end voltage is zero,
Now open auxiliary switch S2Open for ZVS, and due to auxiliary switch S2Electric current be also zero, so auxiliary switch S2
Also open for ZCS；As master switch S1During shutoff, electric capacity C1Both end voltage slowly rises, so master switch S1Turn off for ZVS；Work as pass
Disconnected auxiliary switch S2When, start to electric capacity C2Charge, electric capacity C2Both end voltage slowly rises, so auxiliary switch S2Close for ZVS
Disconnected.
In a word, the power switch tube S in topological structure of the present invention1、S2It is all Sofe Switch, so there is less power damaging
Consumption, higher efficiency.
Below the condition of realizing of Sofe Switch of the present invention is described in detail：
(1) this circuit to be realized and enable Sofe Switch condition from zero load in the whole loading range of load, be necessary for meeting
Inequality：
I0.maxFor output inductor current maxima.
(2) if diode D1There is not conducting time delay and switch S1If there is not leakage current, any in mode 3
Time opens switch S2It is all no-voltage and zero current passing.
(3) switching tube S1Should be in t5Turned off before moment, if in t5Moment does not still turn off, then in inductance LrAnd electricity
Hold C3On circuit oscillation, Simultaneous Switching pipe S then occur2Electric current quickly increase, be a significant increase switching tube S1Conduction loss
And turn-off power loss.
Design to soft switch circuit parameter of the present invention is described in detail below：
(1) selection of inductance L
Circuit is required to be operated under continuous operation mode, in inductance under high frequency situation, most of harmonic current is all by filtered electrical
Hold C to absorb, therefore, it is too little that output inductor can not select, and otherwise, inductive current pulsation can be made to be increased dramatically, flow through switch
The maximum current of pipe also can increase, and so that the working condition of switching tube is deteriorated.It is Δ in the maximum induction pulsation of current of given license
ipp, output inductor L need meet：
fsFor switching frequency, D is dutycycle.
(2) selection of electric capacity C
Output capacitance C is obtained by following formula：
ΔU0For output ripple component.
(3) resonant inductance LrSelection
First, LrShould not obtain excessive, otherwise can make the overlong time of working stage 2, so limit switch
Operating frequency, it nor obtain too little, LrWhen too little, Δ ILrCan be very big, which adds the conduction loss of switching tube.?
In engineering design, general Δ t1=(t2-t1)=0.02DS1Ts, so L can be calculated according to (1) formularValue：
(4) resonant capacitance C2Selection
In order that switching tube S2Open under the conditions of ZVS, be stored in electric capacity C2On energy must working stage 2 when
Time is transferred completely into inductance LrOn, therefore C2Meet following formula：
Tested in 4Kw brshless DC motor, brushless DC motor control system topological structure include rectification circuit,
Soft switch BUCK circuit, three phase bridge circuit, logic control circuit and isolation drive protection circuit, wherein three phase bridge circuit is only responsible for
Commutation, is not modulated, so can avoid because stator current modulating frequency is very high fixed turn produce from son very big
Iron loss, also can reduce motor eddy-current loss, thus reducing motor power consumption.Experiment condition is：Input voltage U=540V, output electricity
Pressure U0=162V, switching frequency f=20kHZ, dutycycle D=0.3.Test result indicate that：Sofe Switch DC-DC conversion electricity of the present invention
There is higher efficiency on road, is about 92% using numerical integrating computational efficiency, than the hard switching BUCK conversion electricity currently using
Road improves 3%.
In the present invention, all of power switch is Sofe Switch, reduces switching loss, improves the delivery efficiency of circuit,
And circuit components are less, structure is simple, easy to control, enhances the reliability of system.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all
Should be included within the scope of the present invention.
Claims (3)
1. a kind of Sofe Switch DC-DC conversion circuit, including direct-flow input end and DC output end it is characterised in that direct-flow input end
(Uin) positive polarity and first switch pipe (S1) colelctor electrode, second switch pipe (S2) colelctor electrode be connected, first switch pipe (S1)
With the first electric capacity (C1), the first diode (D1) in parallel, second switch pipe (S2) and the second electric capacity (C2) in parallel, resonant inductance (Lr)
Two ends and first switch pipe (S1) emitter stage and second switch pipe (S2) emitter stage be connected, the second diode (D2) and the
Three electric capacity (C3) and resonant inductance (Lr) series connection, the first diode (D1) negative electrode and direct-flow input end (Uin) positive polarity be connected,
Second diode (D2) anode and the 3rd electric capacity (C3) be connected, the negative electrode of the 3rd diode (D) and first switch pipe (S1) send out
Emitter-base bandgap grading is connected, the anode of the 3rd diode (D) and direct-flow input end (Uin) negative polarity be connected, the two ends of filter inductance (L) with
First switch pipe (S1) emitter stage with load (R) be connected, the 4th electric capacity (C) with load (R) in parallel, the second electric capacity (C2) with humorous
Shake inductance (Lr) composition resonance circuit.
2. Sofe Switch DC-DC conversion circuit as claimed in claim 1 it is characterised in that：First switch pipe (S1), second switch
Pipe (S2) it is controllability power device, the 3rd diode (D), the first diode (D1), the second diode (D2) for soon restorative two
Pole pipe.
3. Sofe Switch DC-DC conversion circuit as claimed in claim 1 it is characterised in that：The inductance value of filter inductance (L) is humorous
Shake inductance (Lr) more than 200 times of inductance value.
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| CN201410468763.9A CN104201884B (en) | 2014-09-15 | 2014-09-15 | A kind of Sofe Switch DC DC translation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9853547B2 (en) | 2016-04-13 | 2017-12-26 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
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| CN104578773B (en) * | 2014-12-30 | 2017-04-12 | 西安理工大学 | Soft switching circuit for bidirectional DC/DC (direct current/direct current) converter and control method |
| CN104485718B (en) * | 2014-12-30 | 2017-01-04 | 西安理工大学 | A kind of Buck soft switch circuit for accumulator charging and control method thereof |
| US9654003B1 (en) * | 2015-12-29 | 2017-05-16 | Texas Instruments Incorporated | Methods and apparatus for resonant energy minimization in zero voltage transition power converters |
| US10141845B2 (en) | 2016-04-13 | 2018-11-27 | Texas Instruments Incorporated | DC-DC converter and control circuit with low-power clocked comparator referenced to switching node for zero voltage switching |
| US10177658B2 (en) | 2016-04-14 | 2019-01-08 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
| US10141846B2 (en) | 2016-04-15 | 2018-11-27 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
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| CN110061610B (en) * | 2019-05-14 | 2024-04-12 | 无锡海斯凯尔医学技术有限公司 | Ultrasonic power supply system and control method thereof |
| CN113541486B (en) * | 2021-06-23 | 2023-03-28 | 南京军曜科技有限公司 | Interleaved diode capacitor network high-gain ZVT (zero voltage zero volt) direct current converter and auxiliary circuit |
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| US4959764A (en) * | 1989-11-14 | 1990-09-25 | Computer Products, Inc. | DC/DC converter switching at zero voltage |
| JP2007185072A (en) * | 2006-01-10 | 2007-07-19 | Minebea Co Ltd | Dc-dc converter |
| CN201181902Y (en) * | 2008-03-12 | 2009-01-14 | 北方工业大学 | Soft switch BUCK converter |
| FR2929054B1 (en) * | 2008-03-21 | 2014-06-20 | Commissariat Energie Atomique | DECOUPAGE POWER SUPPLY DC DC NOT ISOLATED |
| JP2012005249A (en) * | 2010-06-17 | 2012-01-05 | Sanken Electric Co Ltd | Switching power supply circuit |
| CN102857091A (en) * | 2012-04-18 | 2013-01-02 | 哈尔滨工程大学 | Soft switching circuit |
| CN102710115A (en) * | 2012-05-15 | 2012-10-03 | 江苏固德威电源科技有限公司 | Synchronous rectification BUCK converter for soft switch with small power |
| CN204179944U (en) * | 2014-09-15 | 2015-02-25 | 北京航天新风机械设备有限责任公司 | A kind of Sofe Switch DC-DC conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9853547B2 (en) | 2016-04-13 | 2017-12-26 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
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