CN104953832B - The Buck step-down circuits and its control method controlled based on input voltage feed forward - Google Patents
The Buck step-down circuits and its control method controlled based on input voltage feed forward Download PDFInfo
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Abstract
The invention discloses a kind of Buck step-down circuits controlled based on input voltage feed forward and its control method, the present invention uses the control mode of input voltage feed forward, using with the directly proportional input voltage sampled signal of input voltage as voltage-controlled current source in triangular signal generation circuit control signal, so that the peak value of triangular signal and input voltage direct proportionality, triangular signal is compared with error amplification signal, to obtain the cut-off signals for turning off master power switch pipe, during normal work, output voltage is related only to the downsampling factor of input voltage, and without direct correlation between input voltage, therefore the fluctuation of input voltage influences smaller to output voltage, improve the dynamic response of system, reduce output voltage dynamic fluctuation amplitude simultaneously.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of Buck decompressions controlled based on input voltage feed forward
Type circuit and its control method.
Background technology
In Buck type circuits, power stage circuit and control circuit, described control circuit control power stage are generally comprised
The on off state of circuit master power switch pipe, to adjust output voltage, output voltage is less than input voltage.Control circuit needs root
According to the change of output voltage, the on off state of feedback control master power switch pipe.
As shown in figure 1, being the output voltage control mode of prior art, i.e. sampling and outputting voltage, and it is believed with reference
Number carry out error enhanced processing, obtain error amplification signal VE, by error amplification signal VEIt is compared with triangular signal, from
And obtain controlling the duty cycle signals of power stage circuit master power switch pipe.It has the disadvantage the change dynamic response to input voltage
Relatively slow, when input voltage mutation, due to the time-lag action of output capacitance and inductance larger in circuit, output voltage change is originally
Body needs delay delayed, and its information changed is also delayed by voltage error circuit delay, could form control signal, enter
The regulation of line output voltage.
As shown in Fig. 2 being a kind of control model of input voltage feed forward, with existing triangular wave after input voltage is sampled
Signal be added, the signal again with output voltage error amplified signal VE(obtained by output voltage with reference signal error enhanced processing
To) be compared, when the signal is more than error amplification signal, comparator is output as high level, corresponding rear end rest-set flip-flop
Low level is output as, that is, turns off control signal, when the clock cycle arrives again, rest-set flip-flop is output as high level, so as to produce
Control signal needed for raw circuit.The input voltage feed forward technology that this scheme is used can improve the dynamic response of system,
When input voltage saltus step, closed-loop system being capable of response regulation, but dynamic fluctuation amplitude is larger quickly.
The content of the invention
In view of this, it is an object of the invention to provide a kind of Buck step-down circuits controlled based on input voltage feed forward
And its control method, the technical problem that dynamic response is slow, dynamic fluctuation amplitude is larger to solve prior art presence.
The technical solution of the present invention is to provide a kind of Buck drops controlled based on input voltage feed forward of following structure
Die mould circuit, including power stage circuit and control circuit, described power stage circuit include master power switch pipe, described control
Circuit controls the on off state of power stage circuit master power switch pipe, so that output of the power stage circuit output less than input voltage
Voltage；
Described control circuit includes output voltage feedback circuit and circuit for generating triangular wave, described output voltage feedback
The output voltage of circuit sampling power stage circuit simultaneously carries out error enhanced processing with reference signal, obtains error amplification signal；Adopt
Sample input voltage obtains producing three with the directly proportional input voltage sampled signal of input voltage, described circuit for generating triangular wave
Angle ripple signal, circuit for generating triangular wave receives described input voltage sampled signal, and is determined according to input voltage sampled signal
The peak value of triangular signal；
Described error amplification signal is compared with triangular signal, obtains the shut-off for turning off master power switch pipe
Signal；Described control circuit return pulse signal is used to open master power switch pipe.
Preferably, during normal work, the peak value and input voltage of the triangular signal are in direct ratio.
Preferably, described circuit for generating triangular wave includes first switch and voltage-controlled current source parallel with one another and first
Electric capacity, the two ends of the first switch are connected to the two ends of the first electric capacity, to discharge the first electric capacity；A switch week
In phase, master power switch pipe begins to turn on the moment, and first switch instantaneously discharge the first electric capacity by conducting, then by voltage-controlled current source pair
First electric capacity charges, until the triangular signal reaches peak value.
Preferably, when the peak value of triangular signal is equal to input voltage sampled signal, then size of voltage-controlled current source etc.
In the product divided by the switch periods of master power switch pipe of the capacitance and the value of input voltage sampled signal of the first electric capacity.
The present invention another technical solution is to provide being controlled based on input voltage feed forward for another following structure
The control method of Buck step-down circuits, described Buck step-down circuits include power stage circuit and control circuit, described
Power stage circuit includes master power switch pipe, and described control circuit controls the switch shape of power stage circuit master power switch pipe
State, so that output voltage of the power stage circuit output less than input voltage；
The output voltage of sampled power level circuit simultaneously carries out error enhanced processing with reference signal, obtains error amplification letter
Number；
Produce triangular signal, sampled input voltage obtain with the directly proportional input voltage sampled signal of input voltage,
The peak value of triangular signal is determined according to input voltage sampled signal；
Described error amplification signal is compared with triangular signal, obtains the shut-off for turning off master power switch pipe
Signal；Described control circuit return pulse signal is used to open master power switch pipe.
Preferably, during normal work, the peak value and input voltage of the triangular signal are in direct ratio.
Using the circuit structure of the present invention, compared with prior art, with advantages below：The present invention is using before input voltage
The control mode of feedback, will be pressed with the directly proportional input voltage sampled signal of input voltage as in triangular signal generation circuit
Control the control signal of current source so that the peak value of triangular signal and input voltage direct proportionality, triangular signal and mistake
Poor amplified signal is compared, to obtain the cut-off signals for turning off master power switch pipe, during normal work, and output voltage is only
It is related to the downsampling factor of input voltage, and without direct correlation between input voltage, thus input voltage fluctuation to output
Voltage influence is smaller, improves the dynamic response of system, while reducing output voltage dynamic fluctuation amplitude.
Brief description of the drawings
Fig. 1 is the working waveform figure of prior art output voltage feedback control；
Fig. 2 is the working waveform figure that prior art input voltage feed forward is controlled；
The circuit structure diagram for the Buck step-down circuits that Fig. 3 is controlled for the present invention based on input voltage feed forward；
Fig. 4 is the corresponding working waveform figures of Fig. 3.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing is adopted
With more simplified form and using non-accurately ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
With reference to shown in Fig. 1, illustrate to illustrate two in the work wave of prior art output voltage feedback control, figure to open
Pass cycle, VEError amplification signal has been obtained after carrying out Error processing with corresponding reference signal for output voltage；Error is put
Big signal VEWith triangular signal VRCompare the corresponding pwm signal of generation, the break-make for controlling master power switch pipe.With first
Individual switch periods are reference, and error amplification signal changes, line output voltage of going forward side by side feedback so that second switch periods
Relative to first switch periods of dutycycle change, and the time of switch periods is constant.D1For the dutycycle of first switch periods,
D2For the dutycycle of second switch periods, TSFor the time of whole switch periods.
As described in background, the output voltage feedback of above prior art, due to output capacitance larger in circuit
With the time-lag action of inductance, output voltage change needs delay delayed in itself, therefore dynamic response is slower.
With reference to shown in Fig. 2, the work wave of prior art input voltage feed forward control is illustrated, illustrating two in figure opens
Pass cycle, VEError amplification signal has been obtained after carrying out Error processing with corresponding reference signal for output voltage；VRFor triangular wave
Signal, sampled input voltage and by itself and triangular signal VRAfter superposition, then with error amplification signal VECompare generation corresponding
Pwm signal, the break-make for controlling master power switch pipe.
Due to being superimposed the sampled signal of input voltage on triangular signal, when input voltage changes, with first
Switch periods are reference so that relative to first switch periods of the dutycycle of second switch periods change, switch periods
Time is constant.D1For the dutycycle of first switch periods, D2For the dutycycle of second switch periods, TSFor whole switch week
The time of phase.Although the prior art can be in input voltage saltus step, being capable of response regulation, dynamic fluctuation amplitude quickly
It is larger.
With reference to shown in Fig. 3, the circuit knot for the Buck step-down circuits that the present invention is controlled based on input voltage feed forward is illustrated
Structure, including power stage circuit and control circuit, described power stage circuit include master power switch pipe M, inductance L and the pole of afterflow two
Pipe D, described control circuit controls power stage circuit master power switch pipe M on off state, so that power stage circuit output is low
In input voltage VinOutput voltage Vout。
Described control circuit includes a rest-set flip-flop, in set end (S ends) return pulse signal V of rest-set flip-flopP
For opening master power switch pipe M；Described control circuit also includes output voltage feedback circuit and circuit for generating triangular wave, institute
The output voltage feedback circuit stated is sampled (by by R1And R2The bleeder circuit of composition is realized) output voltage of power stage circuit
VoutAnd with reference signal VrefError enhanced processing, i.e. error originated from input amplifier A two inputs respectively are carried out, are put by error
Big device A output error amplified signals VE。
Described circuit for generating triangular wave produces triangular signal VR, sampled input voltage Vin(carried out by sample circuit
Sampling) obtain and input voltage VinDirectly proportional input voltage sampled signal KVin, circuit for generating triangular wave receives described
Input voltage sampled signal KVin, and according to input voltage sampling KVinSignal determines the peak value of triangular signal；
Described error amplification signal VEWith triangular signal VRIt is compared and (is realized by comparator COMP), is used
In the cut-off signals V of shut-off master power switch pipeC(being exported by comparator COMP), cut-off signals VCInput the reset of rest-set flip-flop
Hold at (R ends)；As error amplification signal VELess than triangular wave VR2During signal, master power switch pipe M is off state.
Described control circuit return pulse signal VPFor opening master power switch pipe, pulse signal VPAnd cut-off signals
VCRest-set flip-flop is inputted respectively, and rest-set flip-flop carries out the control of output pwm signal Vg to master power switch pipe M after logic transformation to it
End processed.
Described circuit for generating triangular wave includes first switch Q1And voltage-controlled current source I and the first electric capacity parallel with one another
C1, the first switch Q1Two ends be connected to the first electric capacity C1Two ends, with to the first electric capacity C1Electric discharge；Opened at one
In the cycle of pass, master power switch pipe M begins to turn on moment, first switch Q1Instantaneously turn on to the first electric capacity C1Electric discharge, then by voltage-controlled
Current source I is to the first electric capacity C1Charging, until triangular signal VRReach peak value.
Described first switch Q1Control signal carries out impulse sampling, that is, pwm signal of sampling by pulse sampling circuit to Vg
Vg rising edge, the pulsewidth for obtaining first switch Q1 control signal is narrower, for instantaneously turning on and to the first electric capacity C1Electric discharge.
During normal work, the peak value and input voltage of the triangular signal are in direct ratio, then can make triangular signal
Peak value is equal to input voltage sampled signal KVin.Under continuous operation mode, Buck step-down circuit output voltages VoutWith input
Voltage VinBetween relation be Vout=DVin.In input voltage saltus step, to make output voltage constant, V need to be metinInverse ratio
In condition as D.In the present invention, it is equal to input voltage sampled signal KV in the peak value of triangular signalinIn the case of, triangle
The peak value of ripple signal and input voltage VinProportionality coefficient be K.
With reference to shown in Fig. 4, the corresponding working waveform figure of Buck step-down circuits in Fig. 3 is illustrated.In normal work, if
VEValue be maintained at V1, triangular signal VRPeak value be arranged on KVin, described peak value refers to the peak of triangular wave and minimum
The difference of point.As shown in Figure 4, dutycycle D and VinThe relation of input voltage is D=V1/KVin.Therefore, before input voltage of the present invention
Under feedback mode, output voltage VoutWith input voltage VinRelation be Vout=V1/ K, it can be seen that, output voltage VoutOnly with it is defeated
Enter voltage VinDownsampling factor K it is related, and with input voltage VinBetween without directly association.
Keep the peak value and input voltage V of triangular signalinIt is in direct ratio, it can be achieved with output voltage VoutWith input
Voltage VinUnrelated (it is accurate equal due to being difficult in practice, therefore it is to reduce output voltage and input electricity to be said on stricti jurise
The degree of association of pressure), the output voltage V in input voltage saltus stepoutHolding is basically unchanged, therefore can be by output voltage dynamic fluctuation
Amplitude is controlled in the range of very little.
For such scheme can setup parameter specific implementation, be illustrated below：
Assuming that Vin=20V, Vout=10V, D=Vout/Vin=0.5, K=0.1 is taken, then KVin=2V, D=V1/KVin, then
V1=VE=KVinD=1V, configuration switch frequency Fs=500kHz, switch periods Ts=2uS, then triangular signal slope
K1=KVin/Ts=V1/ Ts=1 × 106Take C1=400pF, controllable current source I=C1× KVin/Ts=C1× k1=Vin×(C1
× K/Ts)=Vin× K '=400 × 10-6A, K '=C1×K/Ts；Controllable I current sources can pass through input voltage and component parameters
(obtaining ratio K '), which controls to adjust, to be realized, this control method can realize that output loading changes quick response simultaneously, and unlikely
It is excessive in fluctuation amplitude.The slope k 1 of triangular signal is in VinDuring change, slope can then change therewith, after the k2 in figure is change
Slope.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (4)
1. a kind of Buck step-down circuits controlled based on input voltage feed forward, including power stage circuit and control circuit, described
Power stage circuit include master power switch pipe, described control circuit controls the switch shape of power stage circuit master power switch pipe
State, so that output voltage of the power stage circuit output less than input voltage；
It is characterized in that：Described control circuit includes output voltage feedback circuit and circuit for generating triangular wave, described output
The output voltage of voltage feedback circuit sampled power level circuit simultaneously carries out error enhanced processing with reference signal, obtains error amplification
Signal；Sampled input voltage obtains producing electricity with the directly proportional input voltage sampled signal of input voltage, described triangular wave
Road produces triangular signal, and circuit for generating triangular wave receives described input voltage sampled signal, and is sampled according to input voltage
Signal determines the peak value of triangular signal；
Described error amplification signal is compared with triangular signal, is obtained the shut-off for turning off master power switch pipe and is believed
Number；Described control circuit return pulse signal is used to open master power switch pipe,
During normal work, the peak value and input voltage of the triangular signal are in direct ratio,
Described circuit for generating triangular wave includes first switch and voltage-controlled current source parallel with one another and the first electric capacity, described the
The two ends of one switch are connected to the two ends of the first electric capacity, to discharge the first electric capacity, wherein, the control of the voltage-controlled current source
Voltage processed is the input voltage sampled signal.
2. the Buck step-down circuits according to claim 1 controlled based on input voltage feed forward, it is characterised in that：One
In individual switch periods, master power switch pipe begins to turn on the moment, and the first switch instantaneously discharge first electric capacity by conducting,
First electric capacity is charged by the voltage-controlled current source again, until the triangular signal reaches peak value.
3. the Buck step-down circuits according to claim 2 controlled based on input voltage feed forward, it is characterised in that：When three
The peak value of angle ripple signal be equal to input voltage sampled signal when, then the size of voltage-controlled current source be equal to the first electric capacity capacitance with it is defeated
Enter the product of the value of voltage sampling signal divided by the switch periods of master power switch pipe.
4. a kind of control method of the Buck step-down circuits controlled based on input voltage feed forward, described Buck step-down circuits
Including power stage circuit and control circuit, described power stage circuit includes master power switch pipe, described control circuit control
The on off state of power stage circuit master power switch pipe, so that output voltage of the power stage circuit output less than input voltage；
The output voltage of sampled power level circuit simultaneously carries out error enhanced processing with reference signal, obtains error amplification signal；
It is characterized in that：Triangular signal is produced, sampled input voltage obtains adopting with the directly proportional input voltage of input voltage
Sample signal, the peak value of triangular signal is determined according to input voltage sampled signal；
Described error amplification signal is compared with triangular signal, is obtained the shut-off for turning off master power switch pipe and is believed
Number；Described control circuit return pulse signal is used to open master power switch pipe,
During normal work, the peak value and input voltage of the triangular signal are in direct ratio,
Described circuit for generating triangular wave includes first switch and voltage-controlled current source parallel with one another and the first electric capacity, described the
The two ends of one switch are connected to the two ends of the first electric capacity, to discharge the first electric capacity, wherein, the control of the voltage-controlled current source
Voltage processed is the input voltage sampled signal.
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| CN105356746B (en) * | 2015-12-04 | 2018-08-17 | 矽力杰半导体技术(杭州)有限公司 | Turn-on time generation circuit and supply convertor for supply convertor |
| CN106533161A (en) * | 2016-12-02 | 2017-03-22 | 西安电子科技大学 | Slope generation circuit having voltage feedforward |
| CN109787473B (en) * | 2019-02-19 | 2024-03-29 | 西南交通大学 | Control method and device for dual-edge modulation output voltage of boost converter |
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| CN101753015A (en) * | 2008-12-11 | 2010-06-23 | 立锜科技股份有限公司 | Buck power converter capable of improving interactive interference and method thereof |
| CN201956901U (en) * | 2011-01-11 | 2011-08-31 | 杭州电子科技大学 | Power factor correction control circuit |
| CN102832814A (en) * | 2012-09-10 | 2012-12-19 | 上海电力学院 | Method for controlling hysteresis with voltage feedforward quickly |
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| TW200937820A (en) * | 2008-02-20 | 2009-09-01 | Richtek Technology Corp | Buck power converter capable of improving cross-interference and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753015A (en) * | 2008-12-11 | 2010-06-23 | 立锜科技股份有限公司 | Buck power converter capable of improving interactive interference and method thereof |
| CN201956901U (en) * | 2011-01-11 | 2011-08-31 | 杭州电子科技大学 | Power factor correction control circuit |
| CN102832814A (en) * | 2012-09-10 | 2012-12-19 | 上海电力学院 | Method for controlling hysteresis with voltage feedforward quickly |
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| 抑制输入扰动的Buck变换器控制方法;刘青等;《电工技术学报》;20110426;第26卷(第4期);第94-95页的第2-4章，图1-3 * |
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Address after: 210023 Nanjing, Jiangsu Xuanwu Avenue, building 699-27, room 7, No. 302 Patentee after: Nanjing Sili Microelectronics Technology Co., Ltd Address before: 210023 Nanjing, Jiangsu Xuanwu Avenue, building 699-27, room 7, No. 302 Patentee before: Silergy Semiconductor Technology (Hangzhou) Ltd. |