CN105356729B - A kind of control circuit and control method in Switching Power Supply - Google Patents
A kind of control circuit and control method in Switching Power Supply Download PDFInfo
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- CN105356729B CN105356729B CN201510893876.8A CN201510893876A CN105356729B CN 105356729 B CN105356729 B CN 105356729B CN 201510893876 A CN201510893876 A CN 201510893876A CN 105356729 B CN105356729 B CN 105356729B
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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
Abstract
The invention discloses a kind of control circuits and control method in Switching Power Supply, index ramp voltage signal is generated by slope compensation circuit, and pass through the time constant for adjusting the slope compensation circuit, it is more than the half of the amplitude of triangular signal with the amplitude of control characteristic ramp voltage signal, so that thermal compensation signal and the slope of index ramp voltage signal superposition are more than the slope that triangular signal and feedback voltage signal are superimposed, realize the timely control to power switch pipe, ensure that output voltage will not decline excessively, system enters under discontinuous operating mode can steady operation.
Description
Technical field
The present invention relates to field of switch power, more specifically, be related to a kind of control circuit in Switching Power Supply and
Control method.
Background technology
In the feedback control of Switching Power Supply, typically by output voltage feedback compensation signal and the three of characterization inductive current
Angle wave signal is compared, to obtain the switching signal for controlling power switch pipe in Switching Power Supply.In general, characterization electricity
The triangular wave of inducing current is generated according to the duty ratio of power switch pipe, for example, triangular signal as shown in Figure 1 generates
Circuit generates phase signal Vphase according to the duty ratio of power switch pipe, and phase signal Vphase is filtered by the first order
First slope signal Vripple, first slope signal Vripple are obtained after circuit filtering after the filtering of second level filter circuit
Average value signal Vavg is obtained, later, the first slope signal Vripple and the average value signal Vavg are transported by subtraction
Triangular signal Vtr is obtained after calculation, first order filter circuit includes resistance R1 and capacitance C1, and second level filter circuit includes resistance
R2 and capacitance C2.
Under discontinuous operating mode, since duty cycle signals are for a long time low level or high level, then inductive current is characterized
Triangular signal cannot keep complete triangle shape, can finally be intended to rise and reach average value (being zero), such as
Shown in Fig. 2, output voltage can be caused more decline occur in this case, and output voltage decline can force circuit too much
Into continuous mode, so that unstable situation occurs in system, also, bulky capacitor is being lightly loaded, output voltage is under
Descending slope during drop is very slow, system is also caused to be susceptible to unstable.
Invention content
In view of this, the present invention proposes a kind of control circuit and control method in Switching Power Supply, passes through slope
Compensation circuit compensates the feedback voltage signal of output voltage, so that under discontinuous operating mode, output voltage is not in big
The situation that width declines so that system can be stablized in discontinuous operating mode.
A kind of control circuit in Switching Power Supply according to the present invention, the power stage circuit of the Switching Power Supply include
Power switch pipe, continued flow tube and inductance, the Switching Power Supply reception input voltage are converted to desired defeated by power stage circuit
Go out voltage supply load, the control circuit includes triangular signal generation circuit, slope compensation circuit and switching signal and generates
Circuit,
The triangular signal generation circuit receives the switch control signal of the power switch pipe, to generate characterization accordingly
The triangular signal of the inductive current；
The slope compensation circuit includes the first current source, the first capacitance, first resistor and first switch pipe in parallel, leads to
First current source is crossed to first capacitor charging to generate index ramp voltage signal；
The switching signal generation circuit receives feedback voltage signal, the triangular signal and the institute of the output voltage
Index ramp voltage signal is stated, and thermal compensation signal is generated according to feedback voltage signal, later, by the feedback voltage signal and institute
The signal after the signal after triangular signal superposition is superimposed with the thermal compensation signal and the index ramp voltage signal is stated to carry out
Compare, to generate comparison signal, the comparison signal to control the conducting of the power switch pipe, lead by the power switch pipe
After logical regular time, then switching signal generation circuit generates cut-off signals and controls its disconnection；
Wherein, the amplitude of the index ramp voltage signal is more than the half of the triangular signal amplitude, the compensation
The slope of signal after signal and ramp voltage signal superposition is more than the feedback voltage signal and the triangular signal
The slope of signal after superposition.
Further, when the first switch pipe disconnects, first current source gives first capacitor charging, institute
The first capacitance both end voltage is stated as the index ramp voltage signal；
Wherein, when the power switch pipe disconnects, the first switch pipe disconnects；Either the power switch pipe and
The continued flow tube disconnects, and when system enters discontinuous operating mode, the first switch pipe disconnects.
Further, the control circuit further includes the feedback circuit being made of divider resistance and feed-forward capacitance,
The divider resistance includes the first divider resistance and the second divider resistance, first divider resistance and the second partial pressure
Resistance is sequentially connected in series between the output terminal and ground of the Switching Power Supply；
The feed-forward capacitance is connected in the both ends of first divider resistance in parallel, first divider resistance and second point
The voltage of the points of common connection of piezoresistance is as the feedback voltage signal.
Further, the triangular signal generation circuit includes the first order filtered electrical being made of resistance R1 and capacitance C1
Road, by resistance R2 and capacitance the C2 second level filter circuit formed and subtraction circuit,
The triangular signal generation circuit receives the switch control signal, passes through the first order filter circuit and the
First slope signal and average value signal are obtained after secondary filter processing of circuit respectively；
The first slope signal and average value signal obtain the triangular signal after subtraction.
Preferably, the RC time constants of the slope compensation circuit and the discharge time constant of the feedback circuit or described
The discharge time constant of triangular signal generation circuit is consistent.
Further, the switching signal generation circuit includes trsanscondutance amplifier, first adder, second adder, ratio
Compared with device and turn-on time control circuit,
The trsanscondutance amplifier receives the feedback voltage signal and reference voltage signal, is obtained after operational transconductance and compensation
Obtain the thermal compensation signal；
The first adder receives the feedback voltage signal and the triangular signal, is overlapped after processing to obtain
Obtain the first superposed signal；
The second adder receives the thermal compensation signal and the index ramp voltage signal, be overlapped after processing with
Obtain the second superposed signal；
The comparator receives first superposed signal and the second superposed signal, generates the comparison signal；
The turn-on time control circuit receives the comparison signal, to generate the cut-off signals.
A kind of control method in Switching Power Supply according to the present invention, the power stage circuit of the Switching Power Supply include
Power switch pipe, continued flow tube and inductance, the Switching Power Supply reception input voltage are converted to desired defeated by power stage circuit
Go out voltage supply load, the control method includes the following steps：
The switch control signal of the power switch pipe is received, to generate the triangular wave letter for characterizing the inductive current accordingly
Number；
Using the first current source to the first capacitor charging, to generate index ramp voltage signal, first capacitance and the
One resistor coupled in parallel connects；
The feedback voltage signal, the triangular signal and the index ramp voltage signal of the output voltage are received,
Thermal compensation signal is generated according to feedback voltage signal, later, after the feedback voltage signal and triangular signal superposition
Signal after signal is superimposed with the thermal compensation signal and the index ramp voltage signal is compared, to generate comparison signal,
The comparison signal is controlling the shutdown of the power switch pipe；
Wherein, the amplitude of the index ramp voltage signal is more than the half of the triangular signal amplitude, the compensation
The slope of signal after signal and index ramp voltage signal superposition is more than the feedback voltage signal and the triangular wave
The slope of signal after Signal averaging.
Preferably, the step of index ramp voltage signal generates includes：Utilize the first current source in parallel, the first electricity
Appearance, first resistor and first switch pipe generate the index ramp voltage signal,
When the first switch pipe disconnects, first current source gives first capacitor charging, first capacitance
Both end voltage is as the index ramp voltage signal；
When the power switch pipe disconnects, the first switch pipe disconnects；The either power switch pipe and described
Continued flow tube disconnects, and when system enters discontinuous operating mode, the first switch pipe disconnects.
Preferably, the first current source of the parallel connection, the first capacitance, first resistor and first switch pipe composition slope compensation
Circuit, the RC time constants of the slope compensation circuit are consistent with the discharge time constant of triangular signal generation circuit, described
Triangular signal generation circuit is generating the triangular signal.
According to a kind of above-mentioned control circuit and control method in Switching Power Supply, generated by slope compensation circuit
Index ramp voltage signal, and the time constant of the index ramp voltage signal is adjusted, so that index ramp voltage is believed
Number amplitude be more than triangular signal amplitude half so that thermal compensation signal and index ramp voltage signal superposition slope it is big
In the slope that triangular signal and feedback voltage signal are superimposed, the timely control to power switch pipe can be realized so that output
Voltage will not decline excessively, and system enters under discontinuous operating mode can steady operation.
Description of the drawings
Fig. 1 show a kind of realization method of triangular signal generation circuit of the prior art；
Fig. 2 is shown under discontinuous mode, the oscillogram of triangular signal；
Fig. 3 show a kind of physical circuit figure of control circuit in Switching Power Supply according to the present invention；
Fig. 4 show the working waveform figure of circuit shown in Fig. 3；
Fig. 5 show equivalent schematic of the feed-forward capacitance in discharge process；
Fig. 6 show equivalent schematic of the triangular signal generation circuit in discharge process.
Specific embodiment
Several preferred embodiments of the present invention are described in detail, but the present invention is not restricted to below in conjunction with attached drawing
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.In order to which the public is made to have thorough understanding to the present invention, it is described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
As shown in figure 3, by taking Buck adjusting and voltage-reduction switch power supplys as an example, the Buck adjusting and voltage-reduction switch power supply receives input voltage
Vin generates output voltage Vo supply loads after power is converted, in order to maintain output voltage stabilization, passes through sampled output
Feedback voltage signal VfbSwitching signal generation circuit is given, as shown in figure 3, the control circuit of the Switching Power Supply includes switching signal
Generation circuit 302 and triangular signal generation circuit 301, switching signal generation circuit 302 receive feedback voltage signal Vfb, and with
Reference voltage signal VrefApplication condition is carried out to obtain thermal compensation signal Vc.Here, the feedback voltage signal VfbBy by dividing
Resistor network RFB1、RFB2And feed-forward capacitance CffThe feedback circuit of composition is fed back.
Triangular signal generation circuit 301 receives control power switch pipe Q as shown in circuit diagram in Fig. 1M1Switch control
Signal TG processed, to generate the triangular signal Vtr of characterization inductive current, in general, in order to accelerate the dynamic response of feedback, also
By feedback voltage signal VfbIt is overlapped with triangular signal Vtr, to obtain the first superposed signal Vs1.Then, by described first
The superposed signal Vs1 and thermal compensation signal Vc is compared to obtain control power switch pipe QM1Switch-on signal, zero passage
Detection circuit detection continued flow tube QM2Current information, with when detecting the current over-zero for flowing through inductance, control continued flow tube QM2's
Shutdown, wherein, in continuous operation mode, continued flow tube QM2On off state and power switch pipe QM1On off state is on the contrary, working as
Power switch pipe QM1With continued flow tube QM2When being turned off, system enters discontinuous operating mode.
As described in background technology, since under discontinuous operating mode, triangular signal Vtr can change, it is impossible to
Complete triangle shape is kept, so that output voltage cannot be adjusted accurately, causes the unstable operation of system.
For this purpose, inventor on the basis of foregoing circuit, further increases slope compensation circuit 303, such as slope in Fig. 3
Compensation circuit 303, the slope compensation circuit 303 include the first current source I1 in parallel, the first capacitance C1, first resistor R1 and
First switch pipe Q1, in the present embodiment, as the power switch pipe QM1During disconnection, the first switch pipe Q1 is disconnected, described
First current source I1 charges to the first capacitance C1, and the voltage at the first capacitance C1 both ends is as the index ramp voltage
Signal Vslope.
With continued reference to Fig. 3, switching signal generation circuit 302 includes trsanscondutance amplifier Gc, first adder 305, second adds
Musical instruments used in a Buddhist or Taoist mass 304, comparator C1 and turn-on time control circuit Ton, the trsanscondutance amplifier Gc receptions feedback voltage signal VfbAnd ginseng
Examine voltage signal Vref, the thermal compensation signal Vc is obtained after operational transconductance and compensation；The first adder 305 receives described
Feedback voltage signal VfbWith the triangular signal Vtr, it is overlapped after processing to obtain the first superposed signal Vs1；Institute
It states second adder 304 and receives thermal compensation signal Vc and index ramp voltage signal Vslope, be overlapped after processing to obtain the
Two superposed signal Vs2；The comparator C1 receives the first superposed signal Vs1 and the second superposed signal Vs2, generates the ratio
Compared with signal V1；The turn-on time control circuit Ton receives the comparison signal, to generate the cut-off signals.Here, it is described
Switch control signal TG includes comparison signal and cut-off signals.
The slope compensation process of the present invention is illustrated below with reference to working waveform figure shown in Fig. 4：As shown in figure 4, in t1
Carve power switch pipe QM1It is open-minded, to t2 moment, power switch pipe QM1Shutdown, after the t3 moment, output voltage Vo will continue to down
Drop, since output capacitance is bulky capacitor, output voltage decline process is very slow, and feedback voltage signal VfbIt is to pass through
By resistor voltage divider network RFB1、RFB2And feed-forward capacitance CffIt is fed back, due to feed-forward capacitance CffSlow change cannot be coupled to
Change information, therefore, feed-forward capacitance CffElectric discharge will occupy an leading position, the feedback voltage signal V of acquisitionfbWaveform it is as shown in Figure 4.
Moreover, circuit structure according to fig. 3 can deduce that the electric discharge schematic diagram of feed-forward capacitance, can as shown in figure 5, according to the schematic diagram of Fig. 5
The discharge time constant for obtaining feed-forward capacitance is：
Wherein, RFB1、RFB2And RLRespectively resistance RFB1, resistance RFB2With resistance RLResistance value, CffFor feed-forward capacitance Cff's
Capacitance.
On the other hand, in the case of unloaded or underloading, circuit enters discontinuous operating mode, and at this moment, triangular signal generates
Capacitance C1 and capacitance C2 in circuit will discharge, and electric discharge equivalent schematic can obtain as shown in fig. 6, according to the schematic diagram of Fig. 6
Discharge time constant to triangular signal generation circuit is：
Wherein, C1 and C2 is the capacitance of capacitance C1 and capacitance C2, and R2 is the resistance value of resistance R2.
After the t3 moment, due to feedback voltage signal VfbIt cannot be mutated, therefore after itself and triangular signal Vtr superpositions,
Its signal being superimposed is as shown in figure 4, from fig. 4, it can be seen that the first superposed signal exponentially ascendant trend after superposition.And according to
The slope compensation circuit of the embodiment of the present invention, at the t2 moment, as power switch pipe QM1During disconnection, first switch pipe Q1 is disconnected, the
One current source I1 charges to the first capacitance C1, and index ramp voltage signal Vslope also begins to exponentially rise, therefore, in order to keep away
Exempt from output voltage and decline the problem of excessively can be only achieved the first superposed signal, here, the width of index ramp voltage signal Vslope
Value and slope require, since the condition stablized in discontinuous operating mode is that the slope that the second superposed signal rises should be greater than the
The rate of rise of one superposed signal.For exponential voltage signal, under time constant unanimous circumstances, the big slope of amplitude
With regard to bigger.
As seen from Figure 4, index ramp voltage signal Vslope should be greater than the half of the amplitude of triangular signal, and here
Amplitude of one superposed signal after the t3 moment is about the half of triangular signal amplitude, and according to fig. 3 shown in slope mend
Repay circuit, the resistance value that the amplitude of index ramp voltage signal Vslope is multiplied resistance R1 by electric current I1 determines, index ramp voltage letter
Number Vslope is determined the time required to rising to maximum amplitude by the RC time constants of first resistor and the first capacitance.According to above-mentioned
Analysis, the time constant of ramp voltage circuit should be with feed-forward capacitance discharge time constant τ1And triangular signal generation circuit
Discharge time constant τ2It is close, it can realize that the amplitude of ramp voltage signal is greater than the one of the amplitude of triangular signal in this way
Half, while the time constant of ramp voltage circuit can also be controlled, so that the slope of the second superposed signal is more than the first superposition
The slope of signal can realize the timely control to power switch pipe so that output voltage will not decline excessively, and system enters disconnected
It can steady operation under continuous operating mode.
It should be pointed out that in embodiments of the present invention, the first switch pipe Q1 is with power switch pipe QM1Switch
State consistency, according to Fig. 4, for those of ordinary skill in the art it can be deduced that at the t3 moment, system enters discontinuous operating mode (work(
Rate switching tube QM1With continued flow tube QM2It is turned off), first switch pipe Q1 is disconnected, and at this moment, Vslope is in t3 for index ramp voltage signal
Moment starts exponentially to rise, and similarly, by adjusting the time constant of first resistor and the first capacitance, may be such that ramp voltage is believed
Number amplitude be greater than the amplitude of half of triangular signal, while the slope of the second superposed signal is more than the oblique of the first superposed signal
Rate, to obtain same technique effect.
The invention also discloses a kind of control method in Switching Power Supply, the power stage circuit packets of the Switching Power Supply
Power switch pipe, continued flow tube and inductance are included, the Switching Power Supply reception input voltage is converted to desired by power stage circuit
Output voltage supply load, the control method include the following steps：
The switch control signal of the power switch pipe is received, to generate the triangular wave letter for characterizing the inductive current accordingly
Number；
The switch control signal and the first current signal of the power switch pipe are received, to generate index ramp voltage letter
Number；
The feedback voltage signal, the triangular signal and the index ramp voltage signal of the output voltage are received,
Thermal compensation signal is generated according to feedback voltage signal, later, after the feedback voltage signal and triangular signal superposition
Signal after signal is superimposed with the thermal compensation signal and the index ramp voltage signal is compared, to generate comparison signal,
The comparison signal is controlling the shutdown of the power switch pipe；
Wherein, the amplitude of the index ramp voltage signal is more than the half of the triangular signal amplitude, the compensation
The slope of signal after signal and index ramp voltage signal superposition is more than the feedback voltage signal and the triangular wave
The slope of signal after Signal averaging.
Further, the RC time constants of the slope compensation circuit and the discharge time constant one of the feedback circuit
It causes；Also, the RC time constants of the slope compensation circuit and the discharge time constant one of the triangular signal generation circuit
It causes, so as to realize the requirement of above-mentioned index ramp voltage signal amplitude and slope.
Preferred embodiment according to the present invention is carried out for the control circuit in Switching Power Supply and control method above
Detailed description, those of ordinary skill in the art can deduce other technologies or structure and circuit layout, element etc. accordingly
It can be applied to the embodiment.
According to the embodiment of the present invention as described above, these embodiments are there is no all details of detailed descriptionthe, also not
It is only the specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (9)
1. a kind of control circuit in Switching Power Supply, the power stage circuit of the Switching Power Supply includes power switch pipe, continues
Flow tube and inductance, the Switching Power Supply reception input voltage are converted to desired output voltage supply by power stage circuit and bear
It carries, which is characterized in that the control circuit includes feedback circuit, triangular signal generation circuit, slope compensation circuit and switch
Signal generating circuit,
The triangular signal generation circuit receives the switch control signal of the power switch pipe, to generate characterization inductance accordingly
The triangular signal of electric current；
The slope compensation circuit includes in parallel the first current source, the first capacitance, first resistor and first switch pipe, and described the
One current source generates index ramp voltage signal by the RC parallel circuits that first capacitance and the first resistor form；
The switching signal generation circuit receives feedback voltage signal, the triangular signal and the finger of the output voltage
Number ramp voltage signal, and thermal compensation signal is generated according to the feedback voltage signal, later, by the feedback voltage signal and institute
The signal after the signal after triangular signal superposition is superimposed with the thermal compensation signal and the index ramp voltage signal is stated to carry out
Compare, to generate comparison signal, the comparison signal to control the conducting of the power switch pipe, lead by the power switch pipe
After logical regular time, then the switching signal generation circuit generates cut-off signals and controls its disconnection；Wherein, the feedback voltage
Signal by the feedback circuit that resistor voltage divider network and feed-forward capacitance form by being fed back；
Wherein, the amplitude of the index ramp voltage signal is more than the half of the triangular signal amplitude, the thermal compensation signal
The slope of signal after being superimposed with the ramp voltage signal is superimposed more than the feedback voltage signal with the triangular signal
The slope of signal afterwards.
2. control circuit according to claim 1, which is characterized in that when the first switch pipe disconnects, described first
Current source gives first capacitor charging, and the first capacitance both end voltage is as the index ramp voltage signal；
Wherein, when the power switch pipe disconnects, the first switch pipe disconnects；The either power switch pipe and described
Continued flow tube disconnects, and when system enters discontinuous operating mode, the first switch pipe disconnects.
3. control circuit according to claim 2, which is characterized in that the divider resistance includes the first divider resistance and the
Two divider resistances, first divider resistance and second divider resistance are sequentially connected in series the output in the Switching Power Supply
Between end and ground；
The feed-forward capacitance is connected in the both ends of first divider resistance in parallel, first divider resistance and second point described
The voltage of the points of common connection of piezoresistance is as the feedback voltage signal.
4. control circuit according to claim 3, which is characterized in that the triangular signal generation circuit is included by resistance
First order filter circuit that R1 and capacitance C1 are formed, by resistance R2 and capacitance the C2 second level filter circuit formed and subtraction electricity
Road,
The triangular signal generation circuit receives the switch control signal, passes through the first order filter circuit and the second level
First slope signal and average value signal are obtained respectively after filter circuit processing；
The first slope signal and the average value signal obtain the triangular signal after subtraction.
5. control circuit according to claim 4, which is characterized in that the RC time constants of the slope compensation circuit and institute
State feedback circuit discharge time constant or the triangular signal generation circuit discharge time constant it is consistent.
6. control circuit according to claim 1, which is characterized in that the switching signal generation circuit amplifies including mutual conductance
Device, first adder, second adder, comparator and turn-on time control circuit,
The trsanscondutance amplifier receives the feedback voltage signal and reference voltage signal, and the compensation is obtained after operational transconductance
Signal；
The first adder receives the feedback voltage signal and the triangular signal, is overlapped after processing to obtain the
One superposed signal；
The second adder receives the thermal compensation signal and the index ramp voltage signal, is overlapped after processing to obtain
Second superposed signal；
The comparator receives first superposed signal and second superposed signal, generates the comparison signal；
The turn-on time control circuit receives the comparison signal, to generate the letter for controlling the power switch pipe conducting
Number.
7. a kind of control method in Switching Power Supply, the power stage circuit of the Switching Power Supply includes power switch pipe, continues
Flow tube and inductance, the Switching Power Supply reception input voltage are converted to desired output voltage supply by power stage circuit and bear
It carries, which is characterized in that the control method includes the following steps：
The switch control signal of the power switch pipe is received, to generate the triangular signal of characterization inductive current accordingly；
First current source generates index ramp voltage signal by the RC parallel circuits being made of the first capacitance and first resistor；
The feedback voltage signal, the triangular signal and the index ramp voltage signal of the output voltage are received, according to
The feedback voltage signal generates thermal compensation signal, later, after the feedback voltage signal and triangular signal superposition
Signal after signal is superimposed with the thermal compensation signal and the index ramp voltage signal is compared, to generate comparison signal,
The comparison signal is controlling the conducting of the power switch pipe；Wherein, the feedback voltage signal passes through by divider resistance
The feedback circuit of network and feed-forward capacitance composition is fed back；
Wherein, the amplitude of the index ramp voltage signal is more than the half of the triangular signal amplitude, the thermal compensation signal
The slope of signal after being superimposed with the index ramp voltage signal is more than the feedback voltage signal and the triangular signal
The slope of signal after superposition.
8. control method according to claim 7, which is characterized in that the step of index ramp voltage signal generates is wrapped
It includes：The index ramp voltage is generated using the first current source in parallel, the first capacitance, first resistor and first switch pipe to believe
Number,
When the first switch pipe disconnects, first current source gives first capacitor charging, the first capacitance both ends
Voltage is as the index ramp voltage signal；
When the power switch pipe disconnects, the first switch pipe disconnects；The either power switch pipe and the afterflow
Pipe disconnects, and when system enters discontinuous operating mode, the first switch pipe disconnects.
9. control method according to claim 8, which is characterized in that the first current source of the parallel connection, the first capacitance,
One resistance and first switch pipe composition slope compensation circuit, RC time constants and the triangular signal of the slope compensation circuit produce
The discharge time constant of raw circuit is consistent, and the triangular signal generation circuit is generating the triangular signal.
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| FR3066060B1 (en) * | 2017-05-03 | 2020-03-27 | Stmicroelectronics (Rousset) Sas | CUT-OFF POWER CONTROL |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5717322A (en) * | 1996-02-16 | 1998-02-10 | Harris Corporation | Method to improve the peak-current limit in a slope-compensated, current-mode DC/DC converter, and circuit therefor |
| CN103023326A (en) * | 2012-12-11 | 2013-04-03 | 矽力杰半导体技术(杭州)有限公司 | Constant time control method, control circuit and switching regulator using same |
| CN103051177A (en) * | 2012-12-20 | 2013-04-17 | 矽力杰半导体技术(杭州)有限公司 | Quick response control circuit and control method thereof |
| CN103701318A (en) * | 2014-01-10 | 2014-04-02 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for interleaved parallel switched-mode power supply |
| CN104022627A (en) * | 2014-06-24 | 2014-09-03 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and power converter |
| US9013164B1 (en) * | 2013-12-18 | 2015-04-21 | Green Solution Technology Co., Ltd. | Constant on-time controller |
-
2015
- 2015-12-07 CN CN201510893876.8A patent/CN105356729B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5717322A (en) * | 1996-02-16 | 1998-02-10 | Harris Corporation | Method to improve the peak-current limit in a slope-compensated, current-mode DC/DC converter, and circuit therefor |
| CN103023326A (en) * | 2012-12-11 | 2013-04-03 | 矽力杰半导体技术(杭州)有限公司 | Constant time control method, control circuit and switching regulator using same |
| CN103051177A (en) * | 2012-12-20 | 2013-04-17 | 矽力杰半导体技术(杭州)有限公司 | Quick response control circuit and control method thereof |
| US9013164B1 (en) * | 2013-12-18 | 2015-04-21 | Green Solution Technology Co., Ltd. | Constant on-time controller |
| CN103701318A (en) * | 2014-01-10 | 2014-04-02 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for interleaved parallel switched-mode power supply |
| CN104022627A (en) * | 2014-06-24 | 2014-09-03 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and power converter |
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