CN104578774A - Step-down converter based on output voltage ripple control - Google Patents
Step-down converter based on output voltage ripple control Download PDFInfo
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- CN104578774A CN104578774A CN201410851685.0A CN201410851685A CN104578774A CN 104578774 A CN104578774 A CN 104578774A CN 201410851685 A CN201410851685 A CN 201410851685A CN 104578774 A CN104578774 A CN 104578774A
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- signal
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- switch pipe
- power switch
- ripple
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Abstract
The invention discloses a step-down converter based on output voltage ripple control. On the basis of ripple control and fixed turn-on time control, a peak current limiting part is added, when a fixed turn-on time generation circuit judges that turn-on time ends or a peak current limiting circuit judges that a current peak value reaches a limitation value, a main power switch tube is turned off, and triggering is performed according to which situation happens first. Under ripple control, loop dynamic response is fast, the converter can work in a quasi-resonance mode, in a steady state, the converter works at a relative fixed frequency, peak current limitation is performed on the main power switch tube, and the circuits are effectively protected.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of buck convertor controlled based on output voltage ripple.
Background technology
Buck converter is used for the voltage transitions of direct voltage, high voltage is converted to lower constant voltage and exports.The buck converter of prior art generally comprises master power switch pipe, synchro switch pipe, inductance and control circuit, under fixing ON time control model, produce reference signal according to output voltage, reference signal and ramp signal to be compared thus the master power switch pipe of controlled hypotension converter turns off.Adopt output voltage, itself and corresponding reference signal are compared, to realize the conducting of master power switch pipe.Usually, when the conducting of master power switch pipe, synchro switch pipe disconnects, at master power switch pipe blocking interval, and synchro switch pipe conducting afterflow.
But, for above-mentioned prior art, owing to not carrying out current limliting to inductive current peak, the phenomenon that inductance is saturated may be there is, simultaneously also easily damage circuit because peak current is excessive, affect the normal use of circuit.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of buck convertor controlled based on output voltage ripple, inductance saturated phenomenon and the excessive technical problem of peak current may be there is to solve in prior art.
Technical solution of the present invention is, a kind of buck convertor controlled based on output voltage ripple of following structure is provided, comprise master power switch pipe, synchro switch pipe, inductance and control circuit, first termination input voltage of described master power switch pipe, its second end is connected with the first end of synchro switch pipe, one end of described inductance is connected to the common port of master power switch pipe and synchro switch pipe, and the other end of inductance is connected to the output of buck converter; Described control circuit comprises fixing turn-on time generation circuit and ripple control circuit, and described fixing turn-on time generation circuit is by comparing the first reference voltage and ramp signal to turn off master power switch pipe; Described ripple control circuit feeds back to make the conducting of master power switch pipe to output voltage;
Described buck convertor also comprises peak value current-limiting circuit, and described peak value current-limiting circuit sample streams, through the current peak of master power switch pipe, then turns off master power switch pipe when current peak reaches the second reference voltage.
Preferably, the output sampled signal characterizing buck convertor output voltage superposes ripple signal, as the input signal of ripple control circuit first end, the second termination of ripple control circuit receives the 3rd reference signal, exports the Continuity signal making the conducting of master power switch pipe.
Preferably, the 3rd described reference signal is formed by stacking by fixed value signal and correction signal, exports sampled signal and compares with described fixed value signal and obtain described correction signal.
Preferably, described ripple signal is produced by ripple signal circuit for generating, described ripple signal circuit for generating comprises chopper circuit and filter circuit, ripple signal circuit for generating receives the input signal equal with described input voltage, after chopper circuit copped wave, obtain duty cycle signals, described duty cycle signals obtains described ripple signal after filter circuit filtering.
Preferably, described chopper circuit is formed by connecting by two votage control switches, and described filter circuit is connected to the common port of two votage control switches, and the control signal of two votage control switches is identical with the control signal of synchro switch pipe with master power switch pipe respectively.
Preferably, described fixing turn-on time generation circuit comprises reference signal and produces circuit and ramp circuit, reference signal produces circuit and comprises the first resistance, the first current source, the first switch and the first electric capacity, the first described current source flows through the first resistance, the first described switch and the first resistor coupled in parallel, wherein one end ground connection of the first switch, in master power switch pipe conduction period, first switch disconnects, to form the first reference signal on the first electric capacity, at master power switch pipe off period, the first switch closes, to be dragged down by the voltage on the first electric capacity.
Preferably, described ramp circuit comprises the second current source, second switch and the second electric capacity, in master power switch pipe conduction period, second switch disconnects, with to the second capacitor charging, at master power switch pipe off period, second switch closes, with to the second capacitor discharge, thus produce ramp signal.
Adopt structure of the present invention, compared with prior art, have the following advantages: control at ripple and fix on the basis of ON time control, add peak value restricted portion, when fixing turn-on time generation circuit judges that ON time terminates or peak value current-limiting circuit judges that current peak reaches limit value, master power switch pipe is turned off, and two kinds of situations are with the triggering first arrived; Under the ripple of invention controls, loop dynamic response is fast, can be operated in quasi-resonant mode, when stable state, with relatively-stationary frequency operation, and carry out peak value current limliting to master power switch pipe, effectively protect circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is based on the buck convertor that output voltage ripple controls;
Fig. 2 is the structural representation of the generation circuit of the 3rd reference signal.
Fig. 3 is the structural representation of peak value current-limiting circuit.
Fig. 4 is the structural representation of ripple signal circuit for generating.
Fig. 5 is working waveform figure of the present invention.
Embodiment
Below in conjunction with schematic diagram to the output current sample circuit of supply convertor of the present invention and output voltage compensating circuit for a more detailed description, which show the preferred embodiments of the present invention, should be appreciated that those skilled in the art can describe on basis at this, within the scope of the claims physical circuit of the present invention is converted and replaced, and still realize advantageous effects of the present invention.Following description is not as limitation of the present invention.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.It should be noted that, accompanying drawing all adopts the form that comparatively simplifies and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.Meanwhile, in accompanying drawing, may not illustrate all first pieces and annexation one by one, but those of ordinary skill in the art unambiguously can show according to description.
Basic solution of the present invention is, a kind of buck convertor controlled based on output voltage ripple is provided, comprise master power switch pipe, synchro switch pipe, inductance and control circuit, first termination input voltage of described master power switch pipe, its second end is connected with the first end of synchro switch pipe, one end of described inductance is connected to the common port of master power switch pipe and synchro switch pipe, and the other end of inductance is connected to the output of buck converter; Described control circuit comprises fixing turn-on time generation circuit and ripple control circuit, and described fixing turn-on time generation circuit is by comparing the first reference voltage and ramp signal to turn off master power switch pipe; Described ripple control circuit feeds back to make the conducting of master power switch pipe to output voltage; Described buck convertor also comprises peak value current-limiting circuit, and described peak value current-limiting circuit sample streams, through the current peak of master power switch pipe, then turns off master power switch pipe when current peak reaches the second reference voltage.
Shown in figure 1, illustrate the particular circuit configurations of the buck convertor controlled based on output voltage ripple.Fig. 1 illustrates in integrated circuit form, equal five pins of IN, LX, GND, EN, FB, also characterize input voltage signal, inductance link, ground connection, Enable Pin and output sampled signal respectively simultaneously, because this drawings forms limits, therefore do not illustrate inductance, but those of ordinary skill in the art are according to the common port describing all known inductance and be connected to master power switch pipe M1 and synchro switch pipe M2.Master power switch pipe M1 receives input voltage IN, and the first end of its other end synchro switch pipe M2 connects, the second end ground connection of synchro switch pipe M2.The control signal of master power switch pipe M1 is TG, and the control signal of synchro switch pipe M2 is that BG, control signal TG and BG produce by PWM controller, and generally speaking, the sequential logic of the two is contrary.
Fixing turn-on time generation circuit comprises reference signal and produces circuit and ramp circuit, reference signal produces circuit and comprises the first resistance R1, first current source I1, first K switch 1 and the first electric capacity C1, the first described current source I1 flows through the first resistance R1, the first described K switch 1 is in parallel with the first resistance R1, wherein one end ground connection of the first K switch 1, in master power switch pipe M1 conduction period, first K switch 1 disconnects, to form the first reference signal REF1 on the first electric capacity C1, at master power switch pipe M1 off period, first K switch 1 closes, so that the voltage on the first electric capacity C1 is dragged down.Using after control signal TG negate as the control signal of the first K switch 1.
Described ramp circuit comprises the second current source I2, second switch K2 and the second electric capacity C2, in master power switch pipe M1 conduction period, second switch K2 disconnects, to charge to the second electric capacity C2, at master power switch pipe M1 off period, second switch K2 closes, and to discharge to the second electric capacity C2, thus produces ramp signal Ramp.Using after control signal TG negate as the control signal of second switch K2.Wherein REF1=I1*R1*D, D are the duty ratio of buck converter; Ramp=I2*D*Ts/C2, Ts are switch periods; When both are equal and REF1=Ramp time, Ts=R1*C1*I1/I2, makes I1=I2, Ts=R1*C1, realizes certainly frequently.
Above-mentioned first reference signal REF1 and ramp signal Ramp through the first comparator Q1 relatively after produce the first comparison signal Comp1, the peak value current limit signal Peak_lim that first comparison signal Comp1 and peak value current-limiting circuit produce all inputs or door, or R end (reset end) of the output termination rest-set flip-flop of door, the output termination PWM controller of rest-set flip-flop.When ramp signal Ramp reaches (see Fig. 2) when the first reference signal REF1 or current peak Peak_sens reaches the second reference voltage REF2, all by or door, rest-set flip-flop, PWM controller to be to turn off master power switch pipe M1 (master power switch pipe M1 blocking interval, synchro switch pipe M2 conducting).From the mode of operation in fixing ON time, achieve the peak value current limliting to master power switch pipe.
The output voltage of sampling buck converter, obtains exporting sampled signal FB, and output sampled signal FB superposes ripple signal V
slope, described ripple signal V
sloperefer to of ac, as the input signal of ripple control circuit first end, ripple control circuit second termination receive the 3rd reference signal REF3, through the second comparator Q2 relatively after, export the Continuity signal SET making master power switch pipe M1 conducting.Continuity signal SET inputs S end (set end) of described rest-set flip-flop, through trigger and PWM controller to make master power switch pipe M1 conducting (master power switch pipe M1 conduction period, synchro switch pipe M2 turns off).
The 3rd described reference signal REF3 is by fixed value signal Vg and correction signal V
cbe formed by stacking, export sampled signal FB and compare with described fixed value signal Vg and obtain described correction signal V
c.Make the 3rd reference signal REF3 more accurate, to realize feeding back more accurately.
The present invention also includes and makes energy control module, and the described energy control module that makes is connected with Enable Pin EN and rest-set flip-flop respectively.
Shown in figure 2, illustrate the generation circuit of the 3rd reference signal REF3.The 3rd described reference signal REF3 is formed by stacking by fixed value signal Vg and correction signal Vc, exports sampled signal FB and after error amplifier GM compares, obtains described correction signal Vc with described fixed value signal Vg again after electric capacity C3 filtering.
Shown in figure 3, illustrate peak value current-limiting circuit.Adopt the 3rd comparator Q3 to realize in the present embodiment, but be not limited to this execution mode.The first input end of the 3rd comparator Q3 receives the second reference voltage REF2, and its second input receives the current peak Peak_sens flowing through master power switch pipe, and current peak Peak_sens is obtained by the electric current of sample streams through master power switch pipe.When current peak Peak_sens reaches the second reference voltage REF2, produce peak value current limit signal Peak_lim, described peak value current limit signal Peak_lim accesses shown in Fig. 1 or door.
Shown in figure 4, illustrate ripple signal circuit for generating.Ripple signal circuit for generating comprises chopper circuit and filter circuit, described chopper circuit is by two votage control switch (tg, bg) be formed by connecting, the control signal of two votage control switches is respectively TG and BG, it receives input voltage signal IN (may also be the input signal equal with input voltage), the voltage signal at LX place is simulated with this, described filter circuit is connected to the common port of two votage control switches, filter circuit is RC filter circuit, be made up of electric capacity C4 and resistance R2, after chopper circuit copped wave, obtain duty cycle signals, described duty cycle signals obtains described ripple signal V after filter circuit filtering
slope, ripple signal V
slopebe used to be superimposed upon on the output sampled signal FB shown in Fig. 1.
Shown in figure 5, illustrate the work wave of the embodiment of the present invention.To be analyzed as follows Fig. 5 under the continuous conduction mode of stable state: work as REF3>FB+V
slope, make the output of rest-set flip-flop for high, the upper pipe drive singal TG that corresponding PWM controller exports is high, and upper pipe (master power switch pipe M1) conducting, lower pipe (synchro switch pipe M2) drive singal BG is low.Now in ripple circuit for generating, power supply starts to charge to RC filter circuit, V
sloperise.The ripple signal V of of ac
slopebe added to (as shown in Figure 1) on FB, FB+V
slopesignal is also along with V
slopesignal rises, until ON time terminates, fixing ON time circuit for generating exports high level to rest-set flip-flop, and the output signal of rest-set flip-flop is cleared, and it is low for namely going up pipe drive singal TG, and upper pipe turns off, and lower pipe drive singal BG is high.At this moment in ripple circuit for generating, electric capacity C4 is discharged by resistance R2, V
slopedecline, then FB+V
slopesignal also declines thereupon, until REF3 is greater than FB+V again
slope, repeat above process.IL in figure refers to inductive current, when inductive current IL equals the conducting of master power switch pipe, flows through the electric current of master power switch pipe.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (7)
1. the buck convertor controlled based on output voltage ripple, comprise master power switch pipe, synchro switch pipe, inductance and control circuit, first termination input voltage of described master power switch pipe, its second end is connected with the first end of synchro switch pipe, one end of described inductance is connected to the common port of master power switch pipe and synchro switch pipe, and the other end of inductance is connected to the output of buck converter; Described control circuit comprises fixing turn-on time generation circuit and ripple control circuit, and described fixing turn-on time generation circuit is by comparing the first reference voltage and ramp signal to turn off master power switch pipe; Described ripple control circuit feeds back to make the conducting of master power switch pipe to output voltage; It is characterized in that:
Described buck convertor also comprises peak value current-limiting circuit, and described peak value current-limiting circuit sample streams, through the current peak of master power switch pipe, then turns off master power switch pipe when current peak reaches the second reference voltage.
2. the buck convertor controlled based on output voltage ripple according to claim 1, it is characterized in that: in the output sampled signal characterizing buck convertor output voltage, superpose ripple signal, as the input signal of ripple control circuit first end, second termination of ripple control circuit receives the 3rd reference signal, exports the Continuity signal making the conducting of master power switch pipe.
3. the buck convertor controlled based on output voltage ripple according to claim 2, it is characterized in that: the 3rd described reference signal is formed by stacking by fixed value signal and correction signal, export sampled signal and compare with described fixed value signal and obtain described correction signal.
4. the buck convertor controlled based on output voltage ripple according to claim 1, it is characterized in that: described ripple signal is produced by ripple signal circuit for generating, described ripple signal circuit for generating comprises chopper circuit and filter circuit, ripple signal circuit for generating receives the input signal equal with described input voltage, after chopper circuit copped wave, obtain duty cycle signals, described duty cycle signals obtains described ripple signal after filter circuit filtering.
5. the buck convertor controlled based on output voltage ripple according to claim 4, it is characterized in that: described chopper circuit is formed by connecting by two votage control switches, described filter circuit is connected to the common port of two votage control switches, and the control signal of two votage control switches is identical with the control signal of synchro switch pipe with master power switch pipe respectively.
6. the buck convertor controlled based on output voltage ripple according to claim 1, it is characterized in that: described fixing turn-on time generation circuit comprises reference signal and produces circuit and ramp circuit, reference signal produces circuit and comprises the first resistance, first current source, first switch and the first electric capacity, the first described current source flows through the first resistance, the first described switch and the first resistor coupled in parallel, wherein one end ground connection of the first switch, in master power switch pipe conduction period, first switch disconnects, to form the first reference signal on the first electric capacity, at master power switch pipe off period, first switch closes, so that the voltage on the first electric capacity is dragged down.
7. the buck convertor controlled based on output voltage ripple according to claim 6, it is characterized in that: described ramp circuit comprises the second current source, second switch and the second electric capacity, in master power switch pipe conduction period, second switch disconnects, with to the second capacitor charging, at master power switch pipe off period, second switch closes, with to the second capacitor discharge, thus produce ramp signal.3, the voltage conversion circuit based on single inductance multi output according to claim 1, it is characterized in that: described voltage conversion circuit also comprises negative pressure output module, the input of described negative pressure output module is connected with the common port of inductance with the first switching tube, the output of described negative pressure output module is as the output voltage terminal on this road, and negative pressure output module comprises the 6th switching tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410851685.0A CN104578774B (en) | 2014-12-31 | 2014-12-31 | Buck convertor based on output voltage ripple control |
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| CN201410851685.0A CN104578774B (en) | 2014-12-31 | 2014-12-31 | Buck convertor based on output voltage ripple control |
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| CN106533135A (en) * | 2016-11-08 | 2017-03-22 | 成都芯源系统有限公司 | Constant on-time control circuit and DC-DC converter controlled by same |
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| CN110611432A (en) * | 2019-10-18 | 2019-12-24 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and control method of switching converter |
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| CN112366940A (en) * | 2021-01-18 | 2021-02-12 | 四川大学 | Voltage and current quasi-fixed frequency control device and method |
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