CN104079171A - DC-DC converter with quick response characteristic - Google Patents
DC-DC converter with quick response characteristic Download PDFInfo
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- CN104079171A CN104079171A CN201410341514.3A CN201410341514A CN104079171A CN 104079171 A CN104079171 A CN 104079171A CN 201410341514 A CN201410341514 A CN 201410341514A CN 104079171 A CN104079171 A CN 104079171A
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- error amplifier
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Abstract
The invention relates to the field of design of integrated circuits, in particular to a DC-DC converter with the quick response characteristic. The converter comprises a BUCK converter body, a linear voltage stabilizer and a duty ratio control signal generating circuit which are all connected in sequence. The traditional Buck converter body is connected with the output end of the linear voltage stabilizer, the Buck converter body is used for providing stable-state load current, and the overall conversion efficiency is improved; moreover, the linear voltage stabilizer is used for providing instantaneous current under reference voltage steps and load current steps, and thus the response of the whole converter is accelerated.
Description
Technical field
The invention belongs to integrated circuit (IC) design field, relate to specifically a kind of DC-DC converter with fast response characteristic.
Background technology
In Power Management Design, transient response speed and conversion efficiency are all crucial technical indicators.Traditional buck converter mainly contains following two kinds of structures: the switch converters shown in a kind of Fig. 1 of being (Buck), the advantage of this converter is that efficiency is very high, but response speed is slower, on the one hand, inductive current rise/fall slope is limited by input and output voltage, under transient state step, can not change fast output current, on the other hand, the loop bandwidth of switch converters, generally lower than 1/5th of switching frequency, is limited by switching frequency, and the loop response time is long.Another kind is the linear voltage regulator shown in Fig. 2, and it is simple in structure, easily realizes higher bandwidth, under transient state step, can change fast and adjust pipe output current, fast response time, it is poor that its shortcoming is that efficiency depends on input and output voltage, is difficult to realize higher efficiency.In application response speed and conversion efficiency all being had higher requirements at some, as envelop following technology, traditional switch converters and linear voltage regulator all can not meet the demands.
Summary of the invention
Object of the present invention, is exactly the problem existing for above-mentioned traditional circuit, proposes a kind of DC-DC converter with fast response characteristic.
Technical scheme of the present invention is, a kind of DC-DC converter with fast response characteristic, and its special being, comprises that the BUCK converter, linear voltage regulator and the duty cycle control signal that connect successively produce circuit; Described linear voltage regulator, for recommending output type linear voltage regulator, forms EA2 by PMOS pipe MP1, NMOS pipe MN1, the first error amplifier EA1, the second error amplifier; Wherein the source electrode of MP1 meets power vd D, and its grid connects the output of the first error amplifier, and its drain electrode connects the in-phase input end of the first error amplifier; The tie point of the in-phase input end of the drain electrode of MP1 and the first error amplifier meets the drain electrode of output and the MN1 of BUCK converter, the output voltage VO UT that this tie point is whole converter; The grid of MN1 connects the output of the second error amplifier, its source ground VSS; The anti-phase input termination reference voltage V ref of the reversed-phase output of the first error amplifier and the second error amplifier; Described duty cycle control signal produce circuit by PMOS manage MP2, MP3, MP4, NMOS pipe MN2, resistance R 1, R2 forms; Wherein, the source electrode of MP2 meets power vd D, and its grid connects the tie point of the output of the first error amplifier and the grid of MP1, and its drain electrode is by ground connection VSS after R1; The grid of MN2 connects the tie point of the output of the second error amplifier and the grid of MN1, its source ground VSS, and its drain electrode connects the drain electrode of MP3; The drain electrode of MP3 and gate interconnection, its source electrode meets power vd D, and its grid connects the grid of MP4; The source electrode of MP4 meets power vd D, and its drain electrode is by R2 ground connection VSS; The tie point of MP2 and R1 is the positive output end that duty cycle control signal produces circuit, the drain electrode of MP4 and the tie point of R2 are the negative output terminal that duty cycle control signal produces circuit, and duty cycle control signal produces the positive output end of circuit and the difference of negative output terminal voltage is duty cycle control signal V
e.
Beneficial effect of the present invention is, the output of traditional B uck converter and linear voltage regulator is connected, Buck converter is used for providing steady state load electric current, improve overall conversion efficiency, and linear voltage regulator for providing transient current under reference voltage step and load current step, accelerate the response speed of whole converter.
Brief description of the drawings
Fig. 1 is traditional B uck transformer configuration schematic diagram;
Fig. 2 is conventional linear stabilizator structure schematic diagram;
Fig. 3 is DC-DC converter overall structure schematic diagram of the present invention;
Fig. 4 is the transient response schematic diagram under reference voltage step (load is constant resistance R);
Fig. 5 is that (load is current source I to load current step
lOAD) under transient response schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
The present invention is by the advantage in conjunction with switch converters and the each comfortable efficiency of linear voltage regulator and response speed aspect, a kind of Novel DC-DC converter scheme is proposed, switch converters and linear voltage regulator are parallel together, can realize rapid response speed and high conversion efficiency simultaneously.
As described in Figure 3, DC-DC converter of the present invention, comprises that the BUCK converter, linear voltage regulator and the duty cycle control signal that connect successively produce circuit.The described Buck converter using traditional structure identical with Fig. 1, comprises the PMOS pipe, NMOS pipe and the LC network that connect the duty cycle modulator of external power source, be connected with duty cycle modulator output.Described linear voltage regulator, for recommending output type linear voltage regulator, is made up of PMOS pipe MP1, NMOS pipe MN1, the first error amplifier EA1, the second error amplifier EA2; Wherein the source electrode of MP1 meets power vd D, and its grid connects the output of the first error amplifier, and its drain electrode connects the in-phase input end of the first error amplifier; The tie point of the in-phase input end of the drain electrode of MP1 and the first error amplifier meets the drain electrode of output and the MN1 of BUCK converter, the output voltage VO UT that this tie point is whole converter; The grid of MN1 connects the output of the second error amplifier, its source ground VSS; The anti-phase input termination reference voltage V ref of the reversed-phase output of the first error amplifier and the second error amplifier.Described duty cycle control signal produce circuit by PMOS manage MP2, MP3, MP4, NMOS pipe MN2, resistance R 1, R2 forms; Wherein, the source electrode of MP2 meets power vd D, and its grid connects the tie point of the output of the first error amplifier and the grid of MP1, and its drain electrode is by ground connection VSS after R1; The grid of MN2 connects the tie point of the output of the second error amplifier and the grid level of MN1, its source ground VSS, and its drain electrode connects the drain electrode of MP3; The drain electrode of MP3 and gate interconnection, its source electrode meets power vd D, and its grid connects the grid of MP4; The source electrode of MP4 meets power vd D, and its drain electrode is by R2 ground connection VSS; The tie point of MP2 and R1 is the positive output end that duty cycle control signal produces circuit; The drain electrode of MP4 and the tie point of R2 are the negative output terminal that duty cycle control signal produces circuit, and the difference of positive output end and negative output terminal voltage is duty cycle control signal V
e.
Duty cycle modulator in Buck of the present invention can be according to duty cycle control signal V
eregulate Buck duty ratio: work as V
ewhen >0, Buck duty ratio increases, and works as V
ewhen <0, Buck duty ratio reduces.In described linear voltage regulator of recommending output type, error amplifier EA1 and EA2 are by output voltage V
oUTwith reference voltage V
rEFdifference control respectively the electric current of MP1 and MP2 after amplifying: work as V
oUT<V
rEFtime, upper pipe MP1 opens, and lower pipe MN1 is tending towards turn-offing; Work as V
oUT>V
rEFtime, lower pipe MN1 opens, and upper pipe MP1 is tending towards turn-offing; V under stable state
oUT=V
rEF, pipe is all tending towards turn-offing up and down.
Operation principle of the present invention is:
The electric current of linear voltage regulator lower power tube is respectively I
mP1and I
mN1, the image ratio of MP1/MP2 and two current mirrors of MN1/MN2 is all M:1, and the image ratio of MP3/MP4 current mirror is 1:1, and the electric current that flows through MP2 and MP4 is respectively I
m1and I
m2, I
m1=I
mP1/ M, I
m2=I
mN1/ M, the positive terminal voltage of resistance R 1 is RI
m1=RI
mP1/ M, the positive terminal voltage of resistance R 2 is RI
m2=RI
mN1/ M, resistance R 1 equates with the resistance value of resistance R 2, R1=R1=R; Using the difference of the positive terminal voltage of the positive terminal voltage of resistance R 1 and resistance R 2 as duty cycle control signal V
e, V
ewith I
mP1and I
mN1pass be:
Work as V
oUT<V
rEFtime, MP1 electric current increases output charging, and MN1 is tending towards turn-offing, I
mP1-I
mN1>0, V
e>0, Buck duty ratio increases and makes inductive current increase; Work as V
oUT>V
rEFtime, MN1 electric current increases output electric discharge, and MP1 is tending towards turn-offing, I
mP1-I
mN1<0, VE<0, Buck duty ratio reduces and inductive current is declined; Under stable state, V
oUT=V
rEF, I
mP1=I
mN1=0, V
e=0, Buck duty ratio remains unchanged.
The adjustment process of DC-DC converter under transient response is divided into two stages: in the 1st stage, linear voltage regulator detects output voltage V
oUTdepart from reference voltage V
rEFafter, with the very fast upper pipe of response speed unlatching or lower pipe, output is carried out to charge or discharge, by V
oUTbe withdrawn into fast V
rEFnear, this one-phase duration is very short.In the 2nd stage, linear voltage regulator provides extracurrent to make V
oUTmaintain V
rEFnear, duty cycle control signal V simultaneously
echange gradually Buck duty ratio, finally make inductive current meet the needs of new steady state load electric current, because Buck response speed is slower, this adjustment process duration is longer.After entering stable state, I
mP1and I
mN1go to zero, linear voltage regulator is no longer to output power supply.
In order to illustrate two stages of above-mentioned transient response, as shown in Figure 4, be the transient response schematic diagram under reference voltage step (load is constant resistance R), as shown in Figure 5, for load current step, (load is current source I
lOAD) under transient response schematic diagram.
Shown in Fig. 4, consider step response on benchmark, with reference voltage V
rEFfrom V
1upwards step to V
2for starting point, reference voltage V detected
rEFafter variation, current I on linear voltage regulator
mP1increase fast output charging, output voltage V
oUTrise rapidly, work as V
oUTfrom V
1change to V
2time, the 1st stage finished and entered for the 2nd stage.In the 2nd stage, for by output voltage V
oUTmaintain V
2, whole converter need to provide size for V for load R
2the steady state load electric current of/R, due to Buck inductive current I
lalso do not rise to V
2/ R, the inductive current that linear voltage regulator can provide electric current to go undercompensation, at this one-phase, I
mP1+ I
l=V
2/ R, has ensured that the total supply current of whole converter is V
2/ R, on the other hand, due to I
mP1>0 and I
mN1=0, I
mP1-I
mN1>0, V
efor just, Buck converter increases duty ratio gradually makes inductive current I
lrise, final inductive current I
lrise to V
2/ R reaches stable state.Can do the analysis of same procedure for step response under reference voltage, difference is that the current relationship in the 2nd stage is I
l-I
mP1=V
1/ R, the total supply current of whole converter of this stage is V
1/ R.
Shown in Fig. 5, consider step response on load current, when load current is suddenly from I
1increase to I
2time, output voltage V
oUTthere will be instantaneous undershoot, but due to linear voltage regulator very fast-response, upper current I
mP1increase rapidly output charging, V
oUTbe pulled back to very soon reference voltage V
rEF, V
oUTundershoot is effectively suppressed, and this was the 1st stage.Entered for the 2nd stage, for I is provided
2the load current of size, on linear voltage regulator, pipe can provide the inductive current that electric current goes undercompensation, and making the total supply current of whole converter is I
2, i.e. I
mP1+ I
l=I
2, now I
mP1-I
mN1>0, V
efor just, Buck converter increases duty ratio gradually rises inductive current, and final inductive current rises to I
2time reach stable state, now I
mP1=I
mN1=0, V
e=0, Buck duty ratio remains unchanged.Under load current, step response can be done same procedure analysis, and the current relationship in different was the 2nd stage is I
l-I
mN1=I
1, the total supply current of whole converter of this stage is I
1.
Claims (1)
1. a DC-DC converter with fast response characteristic, is characterized in that, comprises that the BUCK converter, linear voltage regulator and the duty cycle control signal that connect successively produce circuit; Described linear voltage regulator, for recommending output type linear voltage regulator, is made up of PMOS pipe MP1, NMOS pipe MN1, the first error amplifier, the second error amplifier; Wherein the source electrode of MP1 meets power vd D, and its grid connects the output of the first error amplifier, and its drain electrode connects the in-phase input end of the first error amplifier; The tie point of the in-phase input end of the drain electrode of MP1 and the first error amplifier meets the output of BUCK converter and the drain electrode of the MN1 output output voltage VO UT as converter; The grid of MN1 connects the output of the second error amplifier, its source ground VSS; The anti-phase input termination reference voltage V ref of the reversed-phase output of the first error amplifier and the second error amplifier; Described duty cycle control signal produce circuit by PMOS manage MP2, MP3, MP4, NMOS pipe MN2, resistance R 1, R2 forms; Wherein, the source electrode of MP2 meets power vd D, and its grid connects the tie point of the output of the first error amplifier and the grid of MP1, and its drain electrode is by ground connection VSS after R1; The grid of MN2 connects the tie point of the output of the second error amplifier and the grid level of MN1, its source ground VSS, and its drain electrode connects the drain electrode of MP3; The drain electrode of MP3 and gate interconnection, its source electrode meets power vd D, and its grid connects the grid of MP4; The source electrode of MP4 meets power vd D, and its drain electrode is by R2 ground connection VSS; The tie point of MP2 and R1 is the positive output end that duty cycle control signal produces circuit, the drain electrode of MP4 and the tie point of R2 are the negative output terminal that duty cycle control signal produces circuit, and duty cycle control signal produces the positive output end of circuit and the difference of negative output terminal voltage is duty cycle control signal V
e.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341514.3A CN104079171B (en) | 2014-07-17 | 2014-07-17 | DC-DC converter with quick response characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341514.3A CN104079171B (en) | 2014-07-17 | 2014-07-17 | DC-DC converter with quick response characteristic |
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| Publication Number | Publication Date |
|---|---|
| CN104079171A true CN104079171A (en) | 2014-10-01 |
| CN104079171B CN104079171B (en) | 2017-01-18 |
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ID=51600264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410341514.3A Expired - Fee Related CN104079171B (en) | 2014-07-17 | 2014-07-17 | DC-DC converter with quick response characteristic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883139A (en) * | 2015-05-22 | 2015-09-02 | 电子科技大学 | Double-switch power supply modulator for envelope tracking system |
| RU178370U1 (en) * | 2017-10-05 | 2018-04-02 | Акционерное общество "Научно-производственная фирма "Микран" | DC / DC MINIATURE POWER MODULE |
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| US20140125299A1 (en) * | 2012-08-10 | 2014-05-08 | Texas Instruments Incorporated | Switched mode assisted linear regulator with decoupled output impedance and signal path bandwidth |
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2014
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Patent Citations (7)
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| CN1443395A (en) * | 2000-05-05 | 2003-09-17 | 艾利森电话股份有限公司 | Apparatus and method for efficiently amplifying wideband envelope signals |
| US7538535B2 (en) * | 2006-01-13 | 2009-05-26 | Dell Products L.P. | Error voltage ripple compensation to extend bandwidth of a feedback loop in a DC-to-DC converter |
| US20100231272A1 (en) * | 2009-03-13 | 2010-09-16 | Richtek Technology Corp. | Buck-boost power converter with feed-forward technique for achieving fast line response |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883139A (en) * | 2015-05-22 | 2015-09-02 | 电子科技大学 | Double-switch power supply modulator for envelope tracking system |
| CN104883139B (en) * | 2015-05-22 | 2018-02-13 | 电子科技大学 | A kind of double switch power modulator for envelope-tracking system |
| RU178370U1 (en) * | 2017-10-05 | 2018-04-02 | Акционерное общество "Научно-производственная фирма "Микран" | DC / DC MINIATURE POWER MODULE |
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| Publication number | Publication date |
|---|---|
| CN104079171B (en) | 2017-01-18 |
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