CN104393751A - High-accuracy and quick-response DC-DC converter - Google Patents
High-accuracy and quick-response DC-DC converter Download PDFInfo
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- CN104393751A CN104393751A CN201410669908.1A CN201410669908A CN104393751A CN 104393751 A CN104393751 A CN 104393751A CN 201410669908 A CN201410669908 A CN 201410669908A CN 104393751 A CN104393751 A CN 104393751A
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- 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
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Abstract
The invention provides a high-accuracy and quick-response DC-DC converter, comprising an output circuit for converting input voltage into output voltage, a sampling circuit for sampling the output voltage to obtain feedback voltage, a capacitor C1 with one end receiving the feedback voltage, a capacitor Cc, a resistor R1 in serial connection with the capacitor C1, a resistor R2, a resistor Req, a transconductance amplifier Gm, a comparator Comp and a logic drive circuit. The other end of the capacitor C1 is connected with the first input end of the comparator Comp; the first input end of the transconductance amplifier Gm receives the feedback voltage, the second input end receives reference voltage and the output ends pass through the resistor Req and the capacitor Cc in sequence and then are grounded; the intermediate node of the resistor Req and the capacitor Cc is connected with the first input end of the comparator Comp via the resistor R1. The second input end of the comparator Comp receives triangular wave signals and the output end is connected with the control end of a power switch in the output circuit via the logic drive circuit. Through the combined action of two loops, the high-precision and quick-response control of the DC-DC converter is realized.
Description
[technical field]
The present invention relates to Power convert field, particularly the DC-to-DC converter that responds fast of a kind of high accuracy.
[background technology]
Along with the development of modern electronic technology, the DC-to-DC converter of (such as smart mobile phone, panel computer etc.) demand High-current output in application.Wish that the load response characteristic of these DC-to-DC converter is good simultaneously, when particularly underloading jumps to heavy duty, wish that the lower skip frame degree of output voltage is very little.If lower skip frame degree is too large, system in case of system halt can be caused.Wish that again the absolute precision of output voltage is high, to resist the environmental changes such as temperature to the impact being powered circuit performance simultaneously.
Therefore need a kind of improvement project to meet the demand of various continuous lifting of the prior art.
[summary of the invention]
The object of the present invention is to provide a kind of DC-to-DC converter, it is fast response time not only, and control precision is also high simultaneously.
In order to solve the problem, the invention provides a kind of DC-to-DC converter, it comprises output circuit, sample circuit, electric capacity C1, electric capacity Cc, resistance R1, resistance R2, resistance Req, trsanscondutance amplifier Gm, comparator Comp and logic drive circuit.Described output circuit, includes power switch, and it is for being converted to output voltage by input voltage.Described in sampling circuit samples, output voltage obtains feedback voltage.Electric capacity C1 and resistance R2 is in parallel, and one end of electric capacity C1 receives described feedback voltage, and the other end is connected with the first input end of described comparator Comp.The first input end of trsanscondutance amplifier Gm receives described feedback voltage, second input receives reference voltage, its output is ground connection after resistance Req and electric capacity Cc successively, and resistance Req is connected with the first input end of described comparator Comp through resistance R1 with the intermediate node of electric capacity Cc.Second input of described comparator Comp receives triangular signal Ramp, and its output is connected with the input of described logic drive circuit, and the output of described logic drive circuit is connected with the control end of described power switch.
Further, output circuit, sample circuit, electric capacity C1 and resistance R2, described comparator Comp, described logic drive circuit form the first feedback control loop jointly, and output circuit, sample circuit, trsanscondutance amplifier Gm, electric capacity Cc, resistance Req, resistance R1, described comparator Comp, described logic drive circuit form the second feedback control loop jointly.
Further, described output circuit comprises power switch K1, diode D1, inductance L 1 and output capacitance Cout, power switch K1, inductance L 1 and electric capacity Cout are series between Input voltage terminal VIN and ground successively, the negative electrode of diode D1 is connected with the intermediate node of inductance L 1 with power switch K1, the plus earth of diode D1, the intermediate node of inductance L 1 and output capacitance Cout is the output of DC-to-DC converter, described sample circuit is connected between the output of DC-to-DC converter and ground, described logic drive circuit has an output, this output is connected with the control end of described power switch K1.
Further, described logic drive circuit comprises duty cycle signals and produces circuit, logical circuit, driver DRV1, the input that described duty cycle signals produces circuit is connected with the output of comparator Comp, its output is connected with the input of logical circuit, the output of logical circuit is connected with the input of driver DRV1, and the output of driver DRV1 is connected with the control end being connected to described power switch K1.
Further, described output circuit comprises power switch K1, power switch K2, inductance L 1 and output capacitance Cout, power switch K1, inductance L 1 and electric capacity Cout are series between Input voltage terminal VIN and ground successively, one end of power switch K2 is connected with the intermediate node of inductance L 1 with power switch K1, the other end ground connection of power switch K2, the intermediate node of inductance L 1 and output capacitance Cout is the output of DC-to-DC converter, described sample circuit is connected between the output of DC-to-DC converter and ground, described logic drive circuit has two outputs, first output is connected with the control end of described power switch K1, second output is connected with the control end of described power switch K2.
Further, described logic drive circuit comprises duty cycle signals and produces circuit, logical circuit, driver DRV1 and the second driver DRV1, the input that described duty cycle signals produces circuit is connected with the output of comparator Comp, its output is connected with the input of logical circuit, described logical circuit has two outputs, an output is connected with the input of driver DRV1, another output is connected with the input of driver DRV2, the output of driver DRV1 is connected with the control end being connected to described power switch K1, the output of driver DRV2 is connected with the control end being connected to described power switch K2.
Compared with prior art, have two control loops in the present invention, Article 1 is quick low precision loop, and Article 2 is high accuracy loop at a slow speed, by the acting in conjunction of two loops, achieves the high accuracy fast-response control of DC-to-DC converter.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Wherein:
Fig. 1 is the DC-to-DC converter structured flowchart in one embodiment in the present invention;
Fig. 2 is the fast-response control circuit circuit diagram in one embodiment in Fig. 1;
Fig. 3 is the DC-to-DC converter structured flowchart in another embodiment in the present invention; With
Fig. 4 is the fast-response control circuit circuit diagram in one embodiment in Fig. 3.
[embodiment]
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different local in this manual " in one embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment.Unless stated otherwise, connection herein, be connected, word that the expression that connects is electrically connected all represents and is directly or indirectly electrical connected.
Fig. 1 is DC-to-DC converter 100 structured flowchart in one embodiment in the present invention.Described DC-to-DC converter comprises output circuit 110, sample circuit 120 and fast-response control circuit 130.
Described output circuit 110 includes power switch K1.The sample circuit 120 described output voltage Vout that samples obtains feedback voltage FB.Described control circuit 130 controls conducting and the cut-off of described power switch K1 based on feedback voltage FB, to make described output circuit 100, input voltage VIN is converted to output voltage Vout.
Described output circuit 110 also comprises diode D1, inductance L 1 and output capacitance Cout.Power switch K1, inductance L 1 and electric capacity Cout are series between Input voltage terminal VIN and ground successively.The negative electrode of diode D1 is connected with the intermediate node of inductance L 1 with power switch K1, the plus earth of diode D1, and the intermediate node of inductance L 1 and output capacitance Cout is the output of DC-to-DC converter 100.Described sample circuit 120 is connected between the output of DC-to-DC converter and ground.
Described sample circuit 120 can be two divider resistances of series connection, the intermediate node output feedack voltage FB of these two divider resistances.
Fig. 2 is fast-response control circuit 130 circuit diagram in one embodiment in Fig. 1.Described control circuit 130 comprises electric capacity C1, electric capacity Cc, resistance R1, resistance R2, resistance Req, trsanscondutance amplifier Gm, comparator Comp and logic drive circuit 132.
Electric capacity C1 and resistance R2 is in parallel, and one end of electric capacity C1 receives described feedback voltage FB, and the other end is connected with the first input end of described comparator Comp.The first input end of trsanscondutance amplifier Gm receives described feedback voltage FB, second input receives reference voltage Ref, its output is ground connection after resistance Req and electric capacity Cc successively, and resistance Req is connected with the first input end of described comparator Comp through resistance R1 with the intermediate node of electric capacity Cc.Second input of described comparator Comp receives triangular signal Ramp, and its output is connected with the input of described logic drive circuit 132, and described logic drive circuit 132 has an output, and this output is connected with the control end of described power switch K1.
Described resistance Rout is the equivalent output resistance of described trsanscondutance amplifier Gm.
Described logic drive circuit 132 comprises duty cycle signals and produces circuit, logical circuit, driver DRV1.The input that described duty cycle signals produces circuit is connected with the output of comparator Comp, its output is connected with the input of logical circuit, the output of logical circuit is connected with the input of driver DRV1, and the output of driver DRV1 is connected with the control end being connected to described power switch K1.
In the above embodiment of the present invention, there are two feedback control loops.
In the first feedback control loop, the first input end that feedback voltage FB is coupled to comparator Comp through electric capacity C1 obtains signal VE, signal VE and triangular signal Ramp compare through comparator Comp and produce triggering signal Trigger, duty cycle signals produces circuit produces certain ON time duty cycle signals VD according to triggering signal Trigger, duty cycle signals VD produces input drive signal HDI through logical circuit Logic, finally by the control end of driver DRV1 output drive signal HD to power switch K1, control the turn-on and turn-off of power switch K1, eventually pass the output voltage Vout that LC filter (being made up of Fig. 1 inductance L 1 and Cout) produces DC-to-DC converter, output voltage Vout is sampled and again forms feedback circuit FB subsequently, the feedback control loop of the quick low precision of such formation one.
In the second feedback control loop, feedback voltage FB compares generation error current through trsanscondutance amplifier Gm with reference voltage Ref, the output contact resistance Req of trsanscondutance amplifier Gm, (in Fig. 2, resistance Rout is not special interpolation to electric capacity Cc and resistance R1 herein, but the equivalent output impedance of trsanscondutance amplifier Gm, also its spur performance impedance can be considered to), the first input end being coupled to comparator Comp obtains signal VE, signal VE and triangular signal Ramp compare through comparator Comp and produce triggering signal Trigger, duty cycle signals produces circuit produces certain ON time duty cycle signals VD according to triggering signal Trigger, duty cycle signals VD produces input drive signal HDI through logical circuit Logic, finally by the control end of driver DRV1 output drive signal HD to power switch K1, control the turn-on and turn-off of power switch K1, eventually pass the output voltage Vout that LC filter (being made up of Fig. 1 inductance L 1 and Cout) produces DC-to-DC converter, output voltage Vout is sampled and again forms feedback circuit FB subsequently, such formation one high-precision feedback control loop at a slow speed.
Under these two feedback control loop actings in conjunction, DC-to-DC converter output voltage can be realized there is response and high-precision characteristic fast simultaneously.When DC-to-DC converter output current is acutely beated, output voltage is adjusted to close near final goal value (should equal reference voltage Ref) by fast feedback loop rapidly (such as within 5 microseconds), thus prevent output voltage amplitude of beating too large, after fast response time terminates at a slow speed high accuracy feedback control loop progressively (such as 100 microseconds) output voltage be adjusted to be equal to final goal value (reference voltage Ref should be equaled).
Quick low precision loop, by designing lower loop gain, to reduce parasitic poles, thus realizes stable.High accuracy loop needs special design to realize loop stability at a slow speed, avoids self-oscillation.Designing high accuracy loop stability is at a slow speed Major Difficulties of the present invention.Highlight below, at a slow speed the Domain Design of high accuracy loop.High accuracy loop needs low-and high-frequency gain at a slow speed, the high accuracy of guarantee output voltage.
To in Fig. 2 at a slow speed high accuracy loop carry out frequency-domain analysis, to need in calculating chart 2 FB node through the transfer function of slow feedback path to node VE.Establish an equation according to Kirchhoff's law:
gm.vfb＝v1/Rout+(v1-v2)/Req
(v1-v2)/Req+(VE-v2)/R1＝v2.s.Cc
(vfb-VE).s.C1+(vfb-VE)/R2＝(VE-v2)/R1
Wherein, gm is the equivalent transconductance value of trsanscondutance amplifier Gm, and vfb is the magnitude of voltage of node FB, and v1 is the node voltage value of node V1, Rout is the equivalent output resistance of trsanscondutance amplifier Gm, v2 is the node voltage value of node V2, and Req is the resistance value of resistance Req, and VE is the magnitude of voltage of node VE, Cc is the capacitance of electric capacity Cc, s is frequency operator, and R2 is the resistance value of resistance R2, and R1 is the resistance value of resistance R1.
Can obtain above-mentioned solving equations:
VE/vfb＝AA/BB
Wherein:
AA＝Rout+Rout.s.C1.R2+s.Cc.Req.R1+Req+Req.s.C1.R2+s.Cc.Req.R1.s.C1.R2+Rout.s.Cc.R1+Rout.s.Cc.R1.s.C1.R2+gm.Rout.R2+s.C1.R2.R1+R1
BB＝Rout.s.Cc.R1.s.C1.R2+Rout.s.Cc.R2+s.Cc.Req.R1+s.Cc.Req.R2+Req+Req.s.C1.R2+s.Cc.Req.R1.s.C1.R2+Rout.s.Cc.R1+Rout.s.C1.R2+Rout+s.C1.R2.R1+R2+R1
Molecule AA is solved and can obtain zero point (Zero):
Z2＝-(C1.R1.R2+Cc.R1.Rout+C1.R2.Req+C1.R2.Rout+Cc.Req.R1)/(R1.R2.C1.Cc.Rout+C.R1.R2.Cc.Req)
Z1＝-(R1+Rout+Req+Rout.R2.gm)/[(R1.R2.C1.Cc.Rout+C.R1.R2.Cc.Req).Z2]，
When meeting Rout>>R1, and Rout>>R2, when gm.Rout>>1, Cc>>C1, can obtain by abbreviation:
Z2＝-1/(R2.C1)，Z1＝-(gm/Cc).(R2/R1)
Solve limit (Pole) to denominator BB can obtain:
P2＝-(Rout.R2.Cc+Req.R1.Cc+Req.R2.Cc+Req.R2.C1+Rout.R1.Cc+Rout.R2.C1+R1.R2.C1)/(Rout.R2.R1.C1.Cc+Req.R1.R2.C1.Cc)
P1＝-(R1+R2+Rout+Req)/[P2.(Rout.R2.R1.C1.Cc+Req.R1.R2.C1.Cc)]
When meeting Rout>>R1, and Rout>>R2, when gm.Rout>>1, Cc>>C1, can obtain by abbreviation:
P2＝-1/[C1.(R1//R2)]
P1＝-1/[Cc.(R1+R2)]
P1 should be designed to dominant pole, and zero point, Z2 was designed the phase place decline that compensation P2 causes, and zero point, Z1 was used to the limit that compensation power level is introduced, and by simulation software, can design good phase margin, realize the stabiloity compensation of loop.
In the present invention, >> represents that both differ from more than 1 order of magnitude, such as Rout>>R1, represents Rout>R1*10
n, wherein n be more than or equal to 1 natural number.
Fig. 3 is DC-to-DC converter 300 structured flowchart in one embodiment in the present invention.Described DC-to-DC converter comprises output circuit 310, sample circuit 320 and fast-response control circuit 330.Compared to Figure 1, it mainly changes diode D1 into power switch K2, and high accuracy fast-response control circuit 330 adds another drive output LD simultaneously.
Fig. 4 is fast-response control circuit 330 circuit diagram in one embodiment in Fig. 3.Compared with Fig. 2, it mainly adds driver DRV2, produces output drive signal LD to power switch K2.General drive singal LD and drive singal HD is inversion signal.Namely, when power switch K1 conducting, power switch K2 turns off; When power switch K2 turns off, power switch K1 conducting.
Operation principle in Fig. 3 with Fig. 4 is identical with example illustrated in fig. 2 with Fig. 1, has repeated no more here.
In the present invention, " connection ", " being connected ", " company ", " connecing " etc. represent the word be electrically connected, and if no special instructions, then represent direct or indirect electric connection.
It is pointed out that the scope be familiar with person skilled in art and any change that the specific embodiment of the present invention is done all do not departed to claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to previous embodiment.
Claims (6)
1. a DC-to-DC converter, is characterized in that, it comprises output circuit, sample circuit, electric capacity C1, electric capacity Cc, resistance R1, resistance R2, resistance Req, trsanscondutance amplifier Gm, comparator Comp and logic drive circuit,
Described output circuit, includes power switch, and it is for being converted to output voltage by input voltage;
Described in sampling circuit samples, output voltage obtains feedback voltage;
Electric capacity C1 and resistance R2 is in parallel, and one end of electric capacity C1 receives described feedback voltage, and the other end is connected with the first input end of described comparator Comp,
The first input end of trsanscondutance amplifier Gm receives described feedback voltage, second input receives reference voltage, its output is ground connection after resistance Req and electric capacity Cc successively, and resistance Req is connected with the first input end of described comparator Comp through resistance R1 with the intermediate node of electric capacity Cc
Second input of described comparator Comp receives triangular signal Ramp, and its output is connected with the input of described logic drive circuit, and the output of described logic drive circuit is connected with the control end of described power switch.
2. DC-to-DC converter according to claim 1, is characterized in that, output circuit, sample circuit, electric capacity C1 and resistance R2, described comparator Comp, described logic drive circuit form the first feedback control loop jointly,
Output circuit, sample circuit, trsanscondutance amplifier Gm, electric capacity Cc, resistance Req, resistance R1, described comparator Comp, described logic drive circuit form the second feedback control loop jointly.
3. DC-to-DC converter according to claim 1 and 2, is characterized in that, described output circuit comprises power switch K1, diode D1, inductance L 1 and output capacitance Cout,
Power switch K1, inductance L 1 and electric capacity Cout are series between Input voltage terminal VIN and ground successively,
The negative electrode of diode D1 is connected with the intermediate node of inductance L 1 with power switch K1, the plus earth of diode D1,
The intermediate node of inductance L 1 and output capacitance Cout is the output of DC-to-DC converter,
Described sample circuit is connected between the output of DC-to-DC converter and ground,
Described logic drive circuit has an output, and this output is connected with the control end of described power switch K1.
4. DC-to-DC converter according to claim 3, is characterized in that, described logic drive circuit comprises duty cycle signals and produces circuit, logical circuit, driver DRV1,
The input that described duty cycle signals produces circuit is connected with the output of comparator Comp, and its output is connected with the input of logical circuit, and the output of logical circuit is connected with the input of driver DRV1,
The output of driver DRV1 is connected with the control end being connected to described power switch K1.
5. DC-to-DC converter according to claim 1 and 2, is characterized in that, described output circuit comprises power switch K1, power switch K2, inductance L 1 and output capacitance Cout,
Power switch K1, inductance L 1 and electric capacity Cout are series between Input voltage terminal VIN and ground successively,
One end of power switch K2 is connected with the intermediate node of inductance L 1 with power switch K1, the other end ground connection of power switch K2,
The intermediate node of inductance L 1 and output capacitance Cout is the output of DC-to-DC converter,
Described sample circuit is connected between the output of DC-to-DC converter and ground,
Described logic drive circuit has two outputs, and the first output is connected with the control end of described power switch K1, and the second output is connected with the control end of described power switch K2.
6. DC-to-DC converter according to claim 5, is characterized in that, described logic drive circuit comprises duty cycle signals and produces circuit, logical circuit, driver DRV1 and the second driver DRV1,
The input that described duty cycle signals produces circuit is connected with the output of comparator Comp, and its output is connected with the input of logical circuit,
Described logical circuit has two outputs, and an output is connected with the input of driver DRV1, and another output is connected with the input of driver DRV2,
The output of driver DRV1 is connected with the control end being connected to described power switch K1,
The output of driver DRV2 is connected with the control end being connected to described power switch K2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018149098A1 (en) * | 2017-02-15 | 2018-08-23 | 华为技术有限公司 | Multi-phase parallel dcdc circuit and chip structure thereof |
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Address after: 214028 Jiangsu Province, Wuxi City District Qingyuan Road No. 18 Taihu International Science Park sensor network university science and Technology Park 530 building A1001 Applicant after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Applicant before: Wuxi Vimicro Co., Ltd. |
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