CN105356729A - Control circuit and control method used in switch power supply - Google Patents
Control circuit and control method used in switch power supply Download PDFInfo
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- CN105356729A CN105356729A CN201510893876.8A CN201510893876A CN105356729A CN 105356729 A CN105356729 A CN 105356729A CN 201510893876 A CN201510893876 A CN 201510893876A CN 105356729 A CN105356729 A CN 105356729A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit and a control method used in a switch power supply, and the method comprises the steps of generating an index slope voltage signal through a slope compensating circuit; controlling the amplitude of the index slope voltage signal to be greater than half of the amplitude of a triangular wave signal by adjusting the time constant of the slope compensating circuit so that the superimposed slope of the compensation signal and the index slope voltage signal is greater than the superimposed slope of the triangular wave signal and a feedback voltage signal. In this way, a power switch tube is controlled in time; the output voltage won't be over-decreased; and the system can work stably in an interrupted work mode.
Description
Technical field
The present invention relates to field of switch power, in particular, relate to a kind of for the control circuit in Switching Power Supply and control method.
Background technology
In the FEEDBACK CONTROL of Switching Power Supply, normally the triangular signal of output voltage feedback compensation signal and sign inductive current is compared, to obtain the switching signal of power switch pipe in control switch power supply.Under normal conditions, the triangular wave characterizing inductive current produces according to the duty ratio of power switch pipe, such as, triangular signal as shown in Figure 1 produces circuit, its duty ratio according to power switch pipe produces phase signal Vphase, phase signal Vphase obtains the first ramp signal Vripple after the filtering of first order filter circuit, first ramp signal Vripple obtains average value signal Vavg after the filter circuit filtering of the second level, afterwards, described first ramp signal Vripple and described average value signal Vavg obtains triangular signal Vtr after subtraction, first order filter circuit comprises resistance R1 and electric capacity C1, second level filter circuit comprises resistance R2 and electric capacity C2.
Under discontinuous operating mode, because duty cycle signals is low level or high level for a long time, the triangular signal then characterizing inductive current just can not keep complete triangle shape, finally can trend towards rising and reaching to mean value (being zero), as shown in Figure 2, in this case output voltage can be made to occur more decline, and output voltage decline can force circuit to enter continuous mode too much, thus make system occur unstable situation, and, in underloading bulky capacitor situation, the descending slope of output voltage in decline process is very slow, also system is caused easily to occur instability.
Summary of the invention
In view of this, the present invention proposes a kind of for the control circuit in Switching Power Supply and control method, the feedback voltage signal of output voltage is compensated by slope compensation circuit, to make under discontinuous operating mode, output voltage there will not be situation about declining to a great extent, and system can be stablized in discontinuous operating mode situation.
According to of the present invention a kind of for the control circuit in Switching Power Supply, the power stage circuit of described Switching Power Supply comprises power switch pipe, continued flow tube and inductance, described Switching Power Supply receives input voltage is converted to expectation output voltage supply load by power stage circuit, described control circuit comprises triangular signal and produces circuit, slope compensation circuit and switching signal generation circuit
Described triangular signal produces the switch controlling signal that circuit receives described power switch pipe, to produce the triangular signal characterizing described inductive current accordingly;
Described slope compensation circuit comprises the first in parallel current source, the first electric capacity, the first resistance and the first switching tube, by described first current source to described first capacitor charging to produce index ramp voltage signal;
Described switching signal produces the feedback voltage signal that circuit receives described output voltage, described triangular signal and described index ramp voltage signal, and produce compensating signal according to feedback voltage signal, afterwards, signal after being superposed with described compensating signal and described index ramp voltage signal by signal after described feedback voltage signal and the superposition of described triangular signal compares, to produce comparison signal, described comparison signal is in order to control the conducting of described power switch pipe, after described power switch pipe conducting regular time, then switching signal produces circuit generation cut-off signals and controls its disconnection,
Wherein, the amplitude of described index ramp voltage signal is greater than the half of described triangular signal amplitude, the slope of signal after described compensating signal and the superposition of described ramp voltage signal be greater than described feedback voltage signal superpose with described triangular signal after the slope of signal.
Further, when described first switching tube disconnects, described first current source gives described first capacitor charging, and described first electric capacity both end voltage is as described index ramp voltage signal;
Wherein, when described power switch pipe disconnects, described first switching tube disconnects; Or described power switch pipe and described continued flow tube all disconnect, when system enters discontinuous operating mode, described first switching tube disconnects.
Further, described control circuit also comprises the feedback circuit be made up of divider resistance and feed-forward capacitance,
Described divider resistance comprises the first divider resistance and the second divider resistance, and described first divider resistance and the second divider resistance are sequentially connected in series between the output and ground of described Switching Power Supply;
Described feed-forward capacitance is connected in the two ends of described first divider resistance in parallel, and the voltage of the points of common connection of described first divider resistance and the second divider resistance is as described feedback voltage signal.
Further, described triangular signal produces circuit and comprises the first order filter circuit be made up of resistance R1 and electric capacity C1, the second level filter circuit be made up of resistance R2 and electric capacity C2 and subtraction circuit,
Described triangular signal produces circuit and receives described switch controlling signal, by obtaining the first ramp signal and average value signal respectively after described first order filter circuit and second level filter circuit process;
Described first ramp signal and average value signal obtain described triangular signal after subtraction.
Preferably, the RC time constant of described slope compensation circuit is consistent with the discharge time constant that the discharge time constant of described feedback circuit or described triangular signal produce circuit.
Further, described switching signal produces circuit and comprises trsanscondutance amplifier, first adder, second adder, comparator and ON time control circuit,
Described trsanscondutance amplifier receives described feedback voltage signal and reference voltage signal, obtains described compensating signal through operational transconductance with after compensating;
Described first adder receives described feedback voltage signal and described triangular signal, to obtain the first superposed signal after carrying out overlap-add procedure;
Described second adder receives described compensating signal and described index ramp voltage signal, to obtain the second superposed signal after carrying out overlap-add procedure;
Described comparator receives described first superposed signal and the second superposed signal, produces described comparison signal;
Described ON time control circuit receives described comparison signal, to produce described cut-off signals.
According to of the present invention a kind of for the control method in Switching Power Supply, the power stage circuit of described Switching Power Supply comprises power switch pipe, continued flow tube and inductance, described Switching Power Supply receives input voltage is converted to expectation output voltage supply load by power stage circuit, and described control method comprises the following steps:
Receive the switch controlling signal of described power switch pipe, to produce the triangular signal characterizing described inductive current accordingly;
Utilize the first current source to the first capacitor charging, to produce index ramp voltage signal, described first electric capacity is connected with the first resistor coupled in parallel;
Receive the feedback voltage signal of described output voltage, described triangular signal and described index ramp voltage signal, compensating signal is produced according to feedback voltage signal, afterwards, signal after being superposed with described compensating signal and described index ramp voltage signal by signal after described feedback voltage signal and the superposition of described triangular signal compares, to produce comparison signal, described comparison signal is in order to control the shutoff of described power switch pipe;
Wherein, the amplitude of described index ramp voltage signal is greater than the half of described triangular signal amplitude, the slope of signal after described compensating signal and the superposition of described index ramp voltage signal be greater than described feedback voltage signal superpose with described triangular signal after the slope of signal.
Preferably, the step that described index ramp voltage signal produces comprises: utilize the first current source in parallel, the first electric capacity, the first resistance and the first switching tube to produce described index ramp voltage signal,
When described first switching tube disconnects, described first current source gives described first capacitor charging, and described first electric capacity both end voltage is as described index ramp voltage signal;
When described power switch pipe disconnects, described first switching tube disconnects; Or described power switch pipe and described continued flow tube all disconnect, when system enters discontinuous operating mode, described first switching tube disconnects.
Preferably, first current source of described parallel connection, the first electric capacity, the first resistance and the first switching tube composition slope compensation circuit, the RC time constant of described slope compensation circuit is consistent with the discharge time constant that triangular signal produces circuit, and described triangular signal produces circuit in order to produce described triangular signal.
According to above-mentioned a kind of for the control circuit in Switching Power Supply and control method, index ramp voltage signal is produced by slope compensation circuit, and regulate the time constant of described index ramp voltage signal, with the half making the amplitude of index ramp voltage signal be greater than the amplitude of triangular signal, the slope of compensating signal and the superposition of index ramp voltage signal is made to be greater than the slope of triangular signal and feedback voltage signal superposition, the timely control to power switch pipe can be realized, make output voltage can not decline too much, system can steady operation under entering discontinuous operating mode.
Accompanying drawing explanation
Figure 1 shows that triangular signal of the prior art produces a kind of implementation of circuit;
Figure 2 shows that under discontinuous mode, the oscillogram of triangular signal;
Figure 3 shows that according to a kind of physical circuit figure for the control circuit in Switching Power Supply of the present invention;
Figure 4 shows that the working waveform figure of circuit shown in Fig. 3;
Figure 5 shows that the equivalent schematic of feed-forward capacitance in discharge process;
Figure 6 shows that triangular signal produces the equivalent schematic of circuit in discharge process.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make on marrow of the present invention and scope substitute, amendment, equivalent method and scheme.To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.
As shown in Figure 3, for Buck adjusting and voltage-reduction switch power supply, described Buck adjusting and voltage-reduction switch power supply receives input voltage vin, produces output voltage Vo supply load, in order to maintain output voltage stabilization, by the feedback voltage signal V of sampled output after power transfer
fbproduce circuit to switching signal, as shown in Figure 3, the control circuit of described Switching Power Supply comprises switching signal and produces circuit 302 and triangular signal generation circuit 301, and switching signal produces circuit 302 and receives feedback voltage signal V
fb, and with reference voltage signal V
refcarry out application condition to obtain compensating signal Vc.Here, described feedback voltage signal V
fbby by resistor voltage divider network R
fB1, R
fB2and feed-forward capacitance C
ffthe feedback circuit of composition feeds back.
Triangular signal produces circuit 301 as shown in circuit diagram in Fig. 1, and it receives and controls power switch pipe Q
m1switch controlling signal TG, characterize the triangular signal Vtr of inductive current to produce, in general, in order to accelerate the dynamic response fed back, also by feedback voltage signal V
fbsuperpose with triangular signal Vtr, to obtain the first superposed signal Vs1.Then, described first superposed signal Vs1 and described compensating signal Vc is compared to obtain control power switch pipe Q
m1switch-on signal, zero cross detection circuit detects continued flow tube Q
m2current information, with when the current over-zero flowing through inductance being detected, control continued flow tube Q
m2shutoff, wherein, when continuous operation mode, continued flow tube Q
m2on off state and power switch pipe Q
m1on off state is contrary, as power switch pipe Q
m1with continued flow tube Q
m2when all turning off, system enters discontinuous operating mode.
As said in background technology, due under discontinuous operating mode, triangular signal Vtr can change, and can not keep complete triangle shape, thus output voltage can not be adjusted accurately, causes the unstable operation of system.
For this reason, inventor is on the basis of foregoing circuit, further increase slope compensation circuit 303, as slope compensation circuit in Fig. 3 303, described slope compensation circuit 303 comprises the first current source I1, the first electric capacity C1 in parallel, the first resistance R1 and the first switching tube Q1, in the present embodiment, as described power switch pipe Q
m1during disconnection, described first switching tube Q1 disconnects, and described first current source I1 charges to described first electric capacity C1, and the voltage at described first electric capacity C1 two ends is as described index ramp voltage signal Vslope.
Continue with reference to figure 3, switching signal produces circuit 302 and comprises trsanscondutance amplifier Gc, first adder 305, second adder 304, comparator C1 and ON time control circuit T
on, trsanscondutance amplifier Gc receives described feedback voltage signal V
fbwith reference voltage signal V
ref, obtain described compensating signal Vc through operational transconductance with after compensating; Described first adder 305 receives described feedback voltage signal V
fbwith described triangular signal Vtr, to obtain described first superposed signal Vs1 after carrying out overlap-add procedure; Described second adder 304 receives compensating signal Vc and index ramp voltage signal Vslope, to obtain the second superposed signal Vs2 after carrying out overlap-add procedure; Described comparator C1 receives described first superposed signal Vs1 and the second superposed signal Vs2, produces described comparison signal V1; Described ON time control circuit Ton receives described comparison signal, to produce described cut-off signals.Here, described switch controlling signal TG comprises comparison signal and cut-off signals.
Slope compensation process of the present invention is set forth: as shown in Figure 4, at t1 moment power switch pipe Q below with reference to the working waveform figure shown in Fig. 4
m1open-minded, to the t2 moment, power switch pipe Q
m1turn off, after the t3 moment, output voltage Vo can continue to decline, because output capacitance is bulky capacitor, therefore, output voltage decline process slowly, and feedback voltage signal V
fbby by resistor voltage divider network R
fB1, R
fB2and feed-forward capacitance C
fffeed back, due to feed-forward capacitance C
ffchange information slowly can not be coupled to, therefore, feed-forward capacitance C
ffelectric discharge will be occupied an leading position, the feedback voltage signal V of acquisition
fbwaveform as shown in Figure 4.And can know the electric discharge schematic diagram of feed-forward capacitance by inference as shown in Figure 5 according to the circuit structure of Fig. 3, according to the schematic diagram of Fig. 5, the discharge time constant that can obtain feed-forward capacitance is:
Wherein, R
fB1, R
fB2and R
lbe respectively resistance R
fB1, resistance R
fB2with resistance R
lresistance, C
fffor feed-forward capacitance C
ffcapacitance.
On the other hand, when under zero load or underloading situation, circuit enters discontinuous operating mode, at this moment, electric capacity C1 in triangular signal generation circuit and electric capacity C2 will discharge, as shown in Figure 6, according to the schematic diagram of Fig. 6, the discharge time constant that can obtain triangular signal generation circuit is its electric discharge equivalent schematic:
Wherein, C1 and C2 is the capacitance of electric capacity C1 and electric capacity C2, and R2 is the resistance of resistance R2.
After the t3 moment, due to feedback voltage signal V
fbcan not suddenly change, after therefore itself and triangular signal Vtr superpose, signal of its superposition as shown in Figure 4, as can be seen from Figure 4, the first superposed signal exponentially ascendant trend after superposition.And according to the slope compensation circuit of the embodiment of the present invention, in the t2 moment, as power switch pipe Q
m1during disconnection, first switching tube Q1 disconnects, first current source I1 charges to the first electric capacity C1, index ramp voltage signal Vslope also starts exponentially to rise, therefore, the problem of the first superposed signal can too much just be reached in order to avoid output voltage declines, here, amplitude and the slope of index ramp voltage signal Vslope all have requirement, because the condition stable at discontinuous operating mode is that the slope that the second superposed signal rises should be greater than the rate of rise of the first superposed signal.For exponential voltage signal, when time constant is consistent, the slope that amplitude is large is just larger.
As seen from Figure 4, index ramp voltage signal Vslope should be greater than the half of the amplitude of triangular signal, here the amplitude of the first superposed signal after the t3 moment is about the half of triangular signal amplitude, and according to the slope compensation circuit shown in Fig. 3, the amplitude of index ramp voltage signal Vslope takes advantage of the resistance of resistance R1 to determine by electric current I 1, and index ramp voltage signal Vslope rises to maximum amplitude required time and determined by the RC time constant of the first resistance and the first electric capacity.According to above-mentioned analysis, the time constant of ramp voltage circuit should with feed-forward capacitance discharge time constant τ
1and triangular signal produces the discharge time constant τ of circuit
2close, the amplitude that can realize ramp voltage signal so is just greater than the half of the amplitude of triangular signal, also can control the time constant of ramp voltage circuit simultaneously, with the slope making the slope of the second superposed signal be greater than the first superposed signal, the timely control to power switch pipe can be realized, make output voltage can not decline too much, system can steady operation under entering discontinuous operating mode.
It is pointed out that in embodiments of the present invention, described first switching tube Q1 is with power switch pipe Q
m1on off state consistent, according to Fig. 4, those of ordinary skill in the art can know by inference, and in the t3 moment, system enters discontinuous operating mode (power switch pipe Q
m1with continued flow tube Q
m2all turn off), first switching tube Q1 disconnects, at this moment, index ramp voltage signal Vslope started exponentially to rise in the t3 moment, in like manner, by regulating the time constant of the first resistance and the first electric capacity, the amplitude of ramp voltage signal can be made just to be greater than the amplitude of half triangular signal, the slope of the second superposed signal is greater than the slope of the first superposed signal simultaneously, to obtain same technique effect.
The invention also discloses a kind of for the control method in Switching Power Supply, the power stage circuit of described Switching Power Supply comprises power switch pipe, continued flow tube and inductance, described Switching Power Supply receives input voltage is converted to expectation output voltage supply load by power stage circuit, and described control method comprises the following steps:
Receive the switch controlling signal of described power switch pipe, to produce the triangular signal characterizing described inductive current accordingly;
Receive switch controlling signal and first current signal of described power switch pipe, to produce index ramp voltage signal;
Receive the feedback voltage signal of described output voltage, described triangular signal and described index ramp voltage signal, compensating signal is produced according to feedback voltage signal, afterwards, signal after being superposed with described compensating signal and described index ramp voltage signal by signal after described feedback voltage signal and the superposition of described triangular signal compares, to produce comparison signal, described comparison signal is in order to control the shutoff of described power switch pipe;
Wherein, the amplitude of described index ramp voltage signal is greater than the half of described triangular signal amplitude, the slope of signal after described compensating signal and the superposition of described index ramp voltage signal be greater than described feedback voltage signal superpose with described triangular signal after the slope of signal.
Further, the RC time constant of described slope compensation circuit is consistent with the discharge time constant of described feedback circuit; Further, the RC time constant of described slope compensation circuit is consistent with the discharge time constant that described triangular signal produces circuit, thus can realize the requirement of above-mentioned index ramp voltage signal amplitude and slope.
Above to according to the preferred embodiments of the present invention carried out detailed description for the control circuit in Switching Power Supply and control method, those of ordinary skill in the art can know other technologies or structure and circuit layout, element etc. accordingly by inference and all can be applicable to described embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this invention is only described yet.Obviously, according to above description, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technical staff that the present invention and the amendment on basis of the present invention can be utilized well to use.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (9)
1. one kind for the control circuit in Switching Power Supply, the power stage circuit of described Switching Power Supply comprises power switch pipe, continued flow tube and inductance, described Switching Power Supply receives input voltage is converted to expectation output voltage supply load by power stage circuit, it is characterized in that, described control circuit comprises triangular signal and produces circuit, slope compensation circuit and switching signal generation circuit
Described triangular signal produces the switch controlling signal that circuit receives described power switch pipe, to produce the triangular signal characterizing described inductive current accordingly;
Described slope compensation circuit comprises the first in parallel current source, the first electric capacity, the first resistance and the first switching tube, by described first current source to described first capacitor charging to produce index ramp voltage signal;
Described switching signal produces the feedback voltage signal that circuit receives described output voltage, described triangular signal and described index ramp voltage signal, and produce compensating signal according to feedback voltage signal, afterwards, signal after being superposed with described compensating signal and described index ramp voltage signal by signal after described feedback voltage signal and the superposition of described triangular signal compares, to produce comparison signal, described comparison signal is in order to control the conducting of described power switch pipe, after described power switch pipe conducting regular time, then switching signal produces circuit generation cut-off signals and controls its disconnection,
Wherein, the amplitude of described index ramp voltage signal is greater than the half of described triangular signal amplitude, the slope of signal after described compensating signal and the superposition of described ramp voltage signal be greater than described feedback voltage signal superpose with described triangular signal after the slope of signal.
2. control circuit according to claim 1, is characterized in that, when described first switching tube disconnects, described first current source gives described first capacitor charging, and described first electric capacity both end voltage is as described index ramp voltage signal;
Wherein, when described power switch pipe disconnects, described first switching tube disconnects; Or described power switch pipe and described continued flow tube all disconnect, when system enters discontinuous operating mode, described first switching tube disconnects.
3. control circuit according to claim 2, is characterized in that, described control circuit also comprises the feedback circuit be made up of divider resistance and feed-forward capacitance,
Described divider resistance comprises the first divider resistance and the second divider resistance, and described first divider resistance and the second divider resistance are sequentially connected in series between the output and ground of described Switching Power Supply;
Described feed-forward capacitance is connected in the two ends of described first divider resistance in parallel, and the voltage of the points of common connection of described first divider resistance and the second divider resistance is as described feedback voltage signal.
4. control circuit according to claim 3, is characterized in that, described triangular signal produces circuit and comprises the first order filter circuit be made up of resistance R1 and electric capacity C1, the second level filter circuit be made up of resistance R2 and electric capacity C2 and subtraction circuit,
Described triangular signal produces circuit and receives described switch controlling signal, by obtaining the first ramp signal and average value signal respectively after described first order filter circuit and second level filter circuit process;
Described first ramp signal and average value signal obtain described triangular signal after subtraction.
5. control circuit according to claim 4, is characterized in that, the RC time constant of described slope compensation circuit is consistent with the discharge time constant that the discharge time constant of described feedback circuit or described triangular signal produce circuit.
6. control circuit according to claim 1, is characterized in that, described switching signal produces circuit and comprises trsanscondutance amplifier, first adder, second adder, comparator and ON time control circuit,
Described trsanscondutance amplifier receives described feedback voltage signal and reference voltage signal, obtains described compensating signal through operational transconductance with after compensating;
Described first adder receives described feedback voltage signal and described triangular signal, to obtain the first superposed signal after carrying out overlap-add procedure;
Described second adder receives described compensating signal and described index ramp voltage signal, to obtain the second superposed signal after carrying out overlap-add procedure;
Described comparator receives described first superposed signal and the second superposed signal, produces described comparison signal;
Described ON time control circuit receives described comparison signal, to produce described cut-off signals.
7. one kind for the control method in Switching Power Supply, the power stage circuit of described Switching Power Supply comprises power switch pipe, continued flow tube and inductance, described Switching Power Supply receives input voltage is converted to expectation output voltage supply load by power stage circuit, it is characterized in that, described control method comprises the following steps:
Receive the switch controlling signal of described power switch pipe, to produce the triangular signal characterizing described inductive current accordingly;
Utilize the first current source to the first capacitor charging, to produce index ramp voltage signal, described first electric capacity is connected with the first resistor coupled in parallel;
Receive the feedback voltage signal of described output voltage, described triangular signal and described index ramp voltage signal, compensating signal is produced according to feedback voltage signal, afterwards, signal after being superposed with described compensating signal and described index ramp voltage signal by signal after described feedback voltage signal and the superposition of described triangular signal compares, to produce comparison signal, described comparison signal is in order to control the shutoff of described power switch pipe;
Wherein, the amplitude of described index ramp voltage signal is greater than the half of described triangular signal amplitude, the slope of signal after described compensating signal and the superposition of described index ramp voltage signal be greater than described feedback voltage signal superpose with described triangular signal after the slope of signal.
8. control method according to claim 7, is characterized in that, the step that described index ramp voltage signal produces comprises: utilize the first current source in parallel, the first electric capacity, the first resistance and the first switching tube to produce described index ramp voltage signal,
When described first switching tube disconnects, described first current source gives described first capacitor charging, and described first electric capacity both end voltage is as described index ramp voltage signal;
When described power switch pipe disconnects, described first switching tube disconnects; Or described power switch pipe and described continued flow tube all disconnect, when system enters discontinuous operating mode, described first switching tube disconnects.
9. control method according to claim 8, it is characterized in that, first current source of described parallel connection, the first electric capacity, the first resistance and the first switching tube composition slope compensation circuit, the RC time constant of described slope compensation circuit is consistent with the discharge time constant that triangular signal produces circuit, and described triangular signal produces circuit in order to produce described triangular signal.
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| CN106300905A (en) * | 2016-08-18 | 2017-01-04 | 成都芯源系统有限公司 | Switch converter and control circuit thereof |
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| CN107070178A (en) * | 2017-03-13 | 2017-08-18 | 黑龙江特通电气股份有限公司 | A kind of slope compensation circuit for automatically adjusting slope compensation slope |
| CN108336903A (en) * | 2018-03-13 | 2018-07-27 | 杰华特微电子（杭州）有限公司 | Control circuit and control method for reduction voltage circuit |
| CN106026653B (en) * | 2016-05-26 | 2018-11-13 | 成都芯源系统有限公司 | Buck-boost converter with slope compensation and controller and control method thereof |
| CN108832798A (en) * | 2017-05-03 | 2018-11-16 | 意法半导体(鲁塞)公司 | Switched-mode power supply control |
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