CN104578774B - Buck convertor based on output voltage ripple control - Google Patents
Buck convertor based on output voltage ripple control Download PDFInfo
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- CN104578774B CN104578774B CN201410851685.0A CN201410851685A CN104578774B CN 104578774 B CN104578774 B CN 104578774B CN 201410851685 A CN201410851685 A CN 201410851685A CN 104578774 B CN104578774 B CN 104578774B
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of buck convertors based on output voltage ripple control, on the basis of ripple controls and fixed turn-on time controls, increase peak value restricted portion, in the case where fixed turn-on time generation circuit judges that turn-on time terminates or peak value current-limiting circuit judges that current peak reaches limit value, master power switch pipe is set to turn off, triggering of two kinds of situations to arrive first；Under the ripple control of invention, loop dynamic response is fast, can be operated in quasi-resonant mode, in stable state, is worked with relatively-stationary frequency, and carry out peak value current limliting to master power switch pipe, is effectively protected circuit.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of voltage-dropping type change based on output voltage ripple control
Parallel operation.
Background technology
Voltage of the buck converter for DC voltage is converted, and high voltage, which is converted to lower constant voltage, to be exported.
The buck converter of the prior art generally comprises master power switch pipe, synchronous switch pipe, inductance and control circuit, is connected fixed
Under time control pattern, reference signal is generated according to output voltage, reference signal is compared to control with ramp signal
The master power switch pipe of buck converter turns off.Using output voltage, it is compared with corresponding reference signal, to realize
The conducting of master power switch pipe.Usually, in the case of the conducting of master power switch pipe, synchronous switch pipe disconnects, and is opened in main power
During closing pipe shutdown, afterflow is connected in synchronous switch pipe.
However, for the above-mentioned prior art, due to not carrying out current limliting to inductive current peak, it is understood that there may be inductance is saturated
The phenomenon that, while being also easy to damage circuit because peak point current is excessive, influence the normal use of circuit.
Invention content
In view of this, the purpose of the present invention is to provide a kind of buck convertor based on output voltage ripple control,
To solve, there may be the excessive technical problems of inductance saturated phenomenon and peak point current in the prior art.
Technical solution of the invention is to provide a kind of voltage-dropping type controlled based on output voltage ripple with lower structure
Converter, including master power switch pipe, synchronous switch pipe, inductance and control circuit, the first end of the master power switch pipe
Input voltage is connect, second end is connected with the first end of synchronous switch pipe, and one end of the inductance is connected to master power switch
The common end of pipe and synchronous switch pipe, the other end of inductance are connected to the output end of buck converter；The control circuit packet
Fixed turn-on time generation circuit and ripple control circuit are included, the fixation turn-on time generation circuit is by comparing the first base
Quasi- voltage is with ramp signal to turn off master power switch pipe；The ripple control circuit feeds back output voltage so as to be led
Power switch tube is connected；
The buck convertor further includes peak value current-limiting circuit, and peak value current-limiting circuit sampling flows through main power
The current peak of switching tube then turns off master power switch pipe when current peak reaches the second reference voltage.
Preferably, it is superimposed ripple signal in the output sampled signal of characterization buck convertor output voltage, as line
The second end of the input signal of wave control circuit first end, ripple control circuit receives third reference signal, exports to make master
The Continuity signal of power switch tube conducting.
Preferably, the third reference signal is formed by stacking by fixing value signal and correction signal, exports sampled signal
The correction signal is relatively obtained with the fixation value signal.
Preferably, by ripple signal circuit generation occurs for the ripple signal, and circuit packet occurs for the ripple signal
Chopper circuit and filter circuit are included, ripple signal occurs circuit and receives the input signal equal with the input voltage, chopped
After circuit copped wave, duty cycle signals are obtained, the ripple signal is obtained after the filtered circuit filtering of duty cycle signals.
Preferably, the chopper circuit is formed by connecting by two votage control switches, and the filter circuit is connected to two
The control signal of the common end of votage control switch, two votage control switches is believed with the control of master power switch pipe and synchronous switch pipe respectively
It is number identical.
Preferably, the fixation turn-on time generation circuit includes reference signal generation circuit and ramp circuit, benchmark
Signal generating circuit includes first resistor, the first current source, first switch and the first capacitance, and first current source flows through
One resistance, the first switch is in parallel with first resistor, and wherein one end ground connection of first switch is connected in master power switch pipe
Period, first switch disconnects, to form the first reference signal on the first capacitance, during master power switch pipe disconnects, and first
Switch is closed, by the voltage pull-down on the first capacitance.
Preferably, the ramp circuit includes the second current source, second switch and the second capacitance, in master power switch pipe
During conducting, second switch disconnects, with to the second capacitor charging, during master power switch pipe disconnects, second switch is closed, with
It discharges the second capacitance, to generate ramp signal.
Structure using the present invention has the following advantages compared with prior art：Turn-on time is controlled and fixes in ripple
On the basis of control, peak value restricted portion is increased, judges that turn-on time terminates or peak value in fixed turn-on time generation circuit
In the case that current-limiting circuit judges that current peak reaches limit value, master power switch pipe is made to turn off, two kinds of situations are touched with what is arrived first
Hair；Under the ripple control of invention, loop dynamic response is fast, quasi-resonant mode can be operated in, in stable state, to be relatively fixed
Frequency work, and to master power switch pipe carry out peak value current limliting, be effectively protected circuit.
Description of the drawings
Fig. 1 is the structural schematic diagram of the buck convertor controlled the present invention is based on output voltage ripple；
Fig. 2 is the structural schematic diagram of the generation circuit of third reference signal.
Fig. 3 is the structural schematic diagram of peak value current-limiting circuit.
Fig. 4 is the structural schematic diagram that circuit occurs for ripple signal.
Fig. 5 is the working waveform figure of the present invention.
Specific implementation mode
Below in conjunction with schematic diagram to the output current sample circuit and output voltage compensation of the supply convertor of the present invention
Circuit is for a more detailed description, and which show the preferred embodiment of the present invention, it should be appreciated that those skilled in the art can be
On the basis of this description, physical circuit of the present invention is converted and replaced within the scope of the claims, and still realizes this hair
Bright advantageous effects.Following description is not intended as limitation of the present invention.
The present invention is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing is adopted
Use with more simplified form and non-accurate ratio, only to it is convenient, lucidly aid in illustrating the embodiment of the present invention
Purpose.Meanwhile may not illustrate all element parts and connection relation in attached drawing one by one, but those of ordinary skill in the art
It can unambiguously be obtained according to description.
The basic solution of the present invention is, provides a kind of buck convertor controlled based on output voltage ripple,
Including master power switch pipe, synchronous switch pipe, inductance and control circuit, the first termination input electricity of the master power switch pipe
Pressure, second end is connected with the first end of synchronous switch pipe, one end of the inductance be connected to master power switch pipe with it is synchronous
The other end of the common end of switching tube, inductance is connected to the output end of buck converter；The control circuit includes that fixation is led
Logical time generation circuit and ripple control circuit, the fixation turn-on time generation circuit by comparing the first reference voltage with
Ramp signal is to turn off master power switch pipe；The ripple control circuit feeds back output voltage so that master power switch
Pipe is connected；The buck convertor further includes peak value current-limiting circuit, and peak value current-limiting circuit sampling flows through main power
The current peak of switching tube then turns off master power switch pipe when current peak reaches the second reference voltage.
Refering to what is shown in Fig. 1, illustrating the particular circuit configurations of the buck convertor controlled based on output voltage ripple.Figure
1 illustrates in integrated circuit form, equal five pins of IN, LX, GND, EN, FB, at the same also characterize respectively input voltage signal,
Inductance connection end, ground connection, Enable Pin and output sampled signal, since this drawings forms limits, therefore do not illustrate inductance, but this field
Those of ordinary skill is according to description inductance connection in the common end of master power switch pipe M1 and synchronous switch pipe M2.Main work(
Rate switching tube M1 receives input voltage IN, and the first end of other end synchronous switch pipe M2 connects, and the second of synchronous switch pipe M2
End ground connection.The control signal of master power switch pipe M1 is TG, and the control signal of synchronous switch pipe M2 is BG, control signal TG and BG
It is generated by PWM controller, it is however generally that, the sequential logic of the two is opposite.
Fixed turn-on time generation circuit includes reference signal generation circuit and ramp circuit, reference signal generation circuit packet
It includes first resistor R1, the first current source I1, first switch K1 and the first capacitance C1, the first current source I1 and flows through the first electricity
R1 is hindered, the first switch K1 is in parallel with first resistor R1, wherein one end ground connection of first switch K1, in master power switch pipe
During M1 is connected, first switch K1 is disconnected, to form the first reference signal REF1 on the first capacitance C1, in master power switch pipe
During M1 is disconnected, first switch K1 is closed, by the voltage pull-down on the first capacitance C1.Will control signal TG negate after as the
The control signal of one switch K1.
The ramp circuit includes the second current source I2, second switch K2 and the second capacitance C2, in master power switch pipe
During M1 is connected, second switch K2 is disconnected, with to the second capacitance C2 chargings, during master power switch pipe M1 is disconnected, second opens
It closes K2 to be closed, to discharge to the second capacitance C2, to generate ramp signal Ramp.It is opened as second after control signal TG is negated
Close the control signal of K2.Wherein REF1=I1*R1*D, D are the duty ratio of buck converter；Ramp=I2*D*Ts/C2, Ts are
Switch periods；When the two is equal, that is, REF1=Ramp when, Ts=R1*C1*I1/I2 enables I1=I2, Ts=R1*C1, realizes certainly
Frequently.
Above-mentioned first reference signal REF1 and ramp signal Ramp through first comparator Q1 relatively after generate and first compare letter
The peak value current limit signal Peak_lim that number Comp1, the first comparison signal Comp1 are generated with peak value current-limiting circuit is inputted or door,
Or the ends R (ends reset) of the output termination rest-set flip-flop of door, the output of rest-set flip-flop terminate PWM controller.Work as ramp signal
Ramp reaches when the first reference signal REF1 or current peak Peak_sens reaches the second reference voltage REF2 (see Fig. 2), logical
Cross or door, rest-set flip-flop, PWM controller with turn off master power switch pipe M1 (during master power switch pipe M1 is turned off, synchronous switch
Pipe M2 conductings).Under the operating mode in fixed turn-on time, the peak value current limliting to master power switch pipe is realized.
The output voltage for sampling buck converter obtains output sampled signal FB, and line is superimposed on output sampled signal FB
Wave signal Vslope, the ripple signal VslopeRefer to of ac, as the input signal of ripple control circuit first end,
The second end of ripple control circuit receives third reference signal REF3, through the second comparator Q2 relatively after, output is making main work(
The Continuity signal SET of rate switching tube M1 conductings.Continuity signal SET inputs the ends S (ends set) of the rest-set flip-flop, triggered device
With PWM controller so that master power switch pipe M1 conductings (during the M1 conductings of master power switch pipe, synchronous switch pipe M2 shutdowns).
The third reference signal REF3 is by fixing value signal Vg and correction signal VCIt is formed by stacking, exports sampled signal
The FB and fixation value signal Vg relatively obtains the correction signal VC.So that third reference signal REF3 is more accurate,
It is more accurately fed back with realizing.
The invention also includes having to make energy control module, it is described make energy control module respectively with Enable Pin EN and rest-set flip-flop
Connection.
Refering to what is shown in Fig. 2, illustrating the generation circuit of third reference signal REF3.The third reference signal REF3 by
Fixed value signal Vg and correction signal Vc is formed by stacking, and the output sampled signal FB and fixation value signal Vg amplifies through error
Device GM relatively after obtain the correction signal Vc after capacitance C3 filtering again.
Refering to what is shown in Fig. 3, illustrating peak value current-limiting circuit.It is realized using third comparator Q3 in the present embodiment, but unlimited
In this embodiment.The first input end of third comparator Q3 receives the second reference voltage REF2, and the second input terminal receives
The current peak Peak_sens of master power switch pipe is flowed through, current peak Peak_sens is to flow through master power switch by sampling
What the electric current of pipe obtained.When current peak Peak_sens reaches the second reference voltage REF2, peak value current limit signal Peak_ is generated
Lim, the peak value current limit signal Peak_lim access shown in FIG. 1 or door.
Refering to what is shown in Fig. 4, illustrating ripple signal occurs circuit.It includes chopper circuit and filtering that circuit, which occurs, for ripple signal
Circuit, the chopper circuit are formed by connecting by two votage control switches (tg, bg), and the control signal of two votage control switches is respectively
TG and BG receives input voltage signal IN (can also be the input signal equal with input voltage), is simulated at LX with this
Voltage signal, the filter circuit are connected to the common end of two votage control switches, and filter circuit is RC filter circuits, by capacitance
C4 and resistance R2 compositions after chopped circuit copped wave, obtain duty cycle signals, after the filtered circuit filtering of duty cycle signals
Obtain the ripple signal Vslope, ripple signal VslopeIt is used to be superimposed upon on output sampled signal FB shown in FIG. 1.
Refering to what is shown in Fig. 5, illustrating the work wave of the embodiment of the present invention.With under the continuous conduction mode of stable state to figure
5 are analyzed as follows：Work as REF3>FB+VslopeSo that the output of rest-set flip-flop is height, the upper tube of corresponding PWM controller output
Drive signal TG is height, and upper tube (master power switch pipe M1) conducting, down tube (synchronous switch pipe M2) drive signal BG is low.At this time
Power supply starts to charge to RC filter circuits in line wave generation circuit, VslopeRise.The ripple signal V of of acslopeIt is folded
(as shown in Figure 1), FB+V are added on FBslopeSignal is also with VslopeSignal rises, and until turn-on time terminates, fixation is connected
Time generating circuit exports high level to rest-set flip-flop so that the output signal of rest-set flip-flop is cleared, i.e. upper tube drive signal
TG is low, and upper tube shutdown, down tube drive signal BG is height.At this moment capacitance C4 is put by resistance R2 in line wave generation circuit
Electricity, VslopeDecline, then FB+VslopeSignal also declines therewith, until REF3 is more than FB+V againslope, repeat above procedure.Figure
In IL refer to inductive current, when inductive current IL is equal to master power switch pipe and is connected, flow through the electric current of master power switch pipe.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of buck convertor based on output voltage ripple control, including master power switch pipe, synchronous switch pipe, inductance
And control circuit, the first termination input voltage of the master power switch pipe, the first end of second end and synchronous switch pipe
It is connected, one end of the inductance is connected to the common end of master power switch pipe and synchronous switch pipe, the other end connection of inductance
In the output end of buck convertor；
The control circuit includes fixed turn-on time generation circuit and ripple control circuit；
The fixed turn-on time generation circuit turns off the main power with ramp signal by comparing the first reference signal and opens
Guan Guan；
It characterizes to be superimposed in the output sampled signal of the output voltage of the buck convertor after duty cycle signals are filtered and obtain
The ripple signal arrived, as the input signal of ripple control circuit first end, the second end of ripple control circuit receives third base
Calibration signal exports to make the Continuity signal of the master power switch pipe conducting, the duty cycle signals simulate the main power
Voltage signal at the public connecting end of switching tube and the synchronous switch pipe.
2. the buck convertor according to claim 1 based on output voltage ripple control, which is characterized in that described the
Three reference signals are formed by stacking by fixing value signal and correction signal, according to the output sampled signal and the fixed value signal
Between error obtain the correction signal.
3. the buck convertor according to claim 1 based on output voltage ripple control, which is characterized in that the line
Wave signal occurs circuit by ripple signal and generates, and it includes chopper circuit and filter circuit that circuit, which occurs, for the ripple signal, described
Ripple signal occurs the circuit reception input signal equal with the input voltage and obtains institute after the chopper circuit copped wave
Duty cycle signals are stated, the duty cycle signals obtain the ripple signal after the filter circuit is filtered.
4. the buck convertor according to claim 3 based on output voltage ripple control, which is characterized in that described
Chopper circuit is connected in series by two votage control switches, and the filter circuit is connected to the public of two votage control switches
End, the control signals of the two votage control switches control signal with the master power switch pipe and the synchronous switch pipe respectively
It is identical.
5. the buck convertor according to claim 1 based on output voltage ripple control, which is characterized in that described solid
It includes reference signal generation circuit and ramp circuit to determine turn-on time generation circuit, and the reference signal generation circuit includes first
Resistance, the first current source, first switch and the first capacitance, first current source is in parallel with the first resistor, and described first
Switch is in parallel with the first resistor, wherein one end ground connection of the first switch, during the master power switch pipe is connected,
First switch disconnects, to form first reference signal on first capacitance.
6. the buck convertor according to claim 5 based on output voltage ripple control, which is characterized in that described oblique
Slope circuit includes the second current source, second switch and the second capacitance being connected in parallel, during the master power switch pipe is connected,
The second switch disconnects, and second current source is to second capacitor charging, the phase is disconnected in the master power switch pipe
Between, the second switch is closed, to discharge second capacitance, to generate the ramp signal.
7. the buck convertor according to claim 1 based on output voltage ripple control, which is characterized in that the drop
Die mould converter further includes peak value current-limiting circuit, and the peak value current-limiting circuit sampling flows through the current peak of the master power switch pipe
Value, the master power switch pipe is then turned off when the current peak reaches the second reference voltage.
8. the buck convertor according to claim 1 based on output voltage ripple control, which is characterized in that the line
Wave signal is simulating the voltage signal of the points of common connection of the master power switch pipe and the synchronous switch pipe.
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Families Citing this family (5)
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|---|---|---|---|---|
| CN106533135B (en) * | 2016-11-08 | 2019-03-22 | 成都芯源***有限公司 | Constant on-time control circuit and DC-DC converter controlled by same |
| CN107171536B (en) * | 2017-06-13 | 2019-11-05 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and switch converters |
| CN109861527B (en) * | 2019-04-02 | 2020-04-10 | 无锡职业技术学院 | Switching power supply system based on hysteresis mode control |
| CN110611432B (en) * | 2019-10-18 | 2020-10-16 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and control method of switching converter |
| CN112366940B (en) * | 2021-01-18 | 2021-04-23 | 四川大学 | Voltage and current quasi-fixed frequency control device and method |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Xihu District, Hangzhou, Wensanlu Road, No. 90, East Software Park, science and technology building, A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |