CN106992679A - The buck suitching type power circuit and its control circuit and method of double set times - Google Patents

The buck suitching type power circuit and its control circuit and method of double set times Download PDF

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Publication number
CN106992679A
CN106992679A CN201610037181.4A CN201610037181A CN106992679A CN 106992679 A CN106992679 A CN 106992679A CN 201610037181 A CN201610037181 A CN 201610037181A CN 106992679 A CN106992679 A CN 106992679A
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China
Prior art keywords
circuit
time
signal
power switch
reduction voltage
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CN201610037181.4A
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CN106992679B (en
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郑闳彧
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Richtek Technology Corp
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Richtek Technology Corp
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1582Buck-boost converters

Abstract

The present invention proposes the buck suitching type power circuit and its control circuit and method of a kind of pair of set time.This pair of set time buck suitching type power circuit is included:One reduction voltage circuit, comprising:One inductance, with first end and the second end;First power switch of one reduction voltage circuit, its one end and the first end of the inductance are coupled, and its other end and an input voltage are coupled;And one reduction voltage circuit power component, the first end of its one end and the inductance couples, its other end ground connection;One booster circuit, comprising:The inductance;First power switch of one booster circuit, its one end and the second end of the inductance are coupled, its other end ground connection;And one booster circuit power component, the second end of its one end and the inductance couples, its other end and output voltage coupling;And one control circuit.

Description

The buck suitching type power circuit and its control circuit and method of double set times
Technical field
It is special the present invention relates to a kind of pair of set time (dual constant time) buck suitching type power circuit Do not refer to a kind of current control formula (current mode) or voltage type (voltage for needing to produce two groups of set times Mode) buck suitching type power circuit.The present invention also relates to control control circuit and the side of buck suitching type power circuit Method.
Background technology
Refer to the side that a kind of control buck suitching type power circuit is disclosed in Figure 1A, United States Patent (USP) US 6166527 Method.Buck suitching type power circuit includes inductance L, four power switch A, B, C, D, and control circuit 20.Control circuit 20 control four power switch A, B, C, D switching, output voltage Vout is converted to by input voltage vin, wherein input electricity Pressure Vin could possibly be higher than or less than output voltage Vout, therefore power circuit may need progress buck or boost conversion.Control electricity In road 20, error amplifier 22 is compared feedback signal FB (information for representing output voltage Vout) with reference voltage Vref, is produced Raw error amplification signal Vea.The error is amplified signal Vea and voltage waveform VX by PWM (PWM) comparator 24,25 respectively Compare with VY, and logic circuit 29 is according to PWM comparators 24,25 comparative result produces switch control signal VA, VB, VC, VD, controls power switch A, B, C, D respectively.
Error amplification signal Vea, voltage waveform VX and VY, switch control signal VA, VB, VC, VD relation such as Figure 1B institutes Show, when error amplification signal Vea falls between voltage V1 and V2, power circuit carries out pure decompression conversion, amplifies when error and interrogates When number Vea is fallen between voltage V2 and V3, power circuit carries out buck conversion, when error amplification signal Vea falls in voltage V3 When between V4, power circuit carries out pure boost conversion.In pure decompression translative mode, power switch C keeps open circuit and power is opened Close D to be held on, in pure boost conversion pattern, power switch A is held on and power switch B keeps open circuit.Turn in buck During mold changing formula, as illustrated, amplifying signal Vea and voltage waveform VX relativeness according to error and producing switch control signal VA, VB, and signal Vea and voltage waveform VY relativeness is amplified according to error and switch control signal VC is produced, VD changes speech Power circuit boosted (switch C, D action) and married operation of decompression (switch A, B action).
The feature of above-mentioned prior art is to be changed containing pure boost conversion pattern, pure decompression translative mode, and buck Pattern, and V3 must be necessarily less than containing buck conversion section, i.e. V2, otherwise system can be caused unstable.And in lifting When pressing translative mode, four switches can all switch in any cycle, and cause switch cost (switching loss) so that energy Amount consume increase.The conflict of the two features is the major defect of this prior art.
Fig. 2A, which is shown, utilizes error amplification in another prior art United States Patent (USP) US 7176667 framework, the patent application Device 22 produces two grouping errors amplification signal Vea1 and Vea2, selects an input PWM comparators 24 and is compared with voltage waveform OSC.In addition, One fixed pulse width generation circuit 26, output and fixed pulse width of the logic circuit 29 according to PWM comparators 24 are separately set in circuit The output of generation circuit 26, produces switch control signal VA, VB, VC, VD, and power switch A, B, C, D are controlled respectively.
Refer to and be divided into four translative mode in Fig. 2 B, United States Patent (USP) US 7176667, except pure decompression translative mode M1 Outside pure boost conversion pattern M4, intermediary decompression translative mode M2 and intermediary boost conversion pattern M3 is additionally provided with therebetween, The switch control signal VA in intermediary decompression translative mode M2, VB follow the output of PWM comparators 24 and switch control signal VC, VD is fixed pulse width, and the switch control signal VC in intermediary decompression translative mode M3, VD follows the output of PWM comparators 24 and opened It is fixed pulse width to close control signal VA, VB.
The shortcoming of above-mentioned prior art is that the controlling mechanism of four translative mode is complex, it is necessary to which another set fixed arteries and veins Wide generation circuit 26 and other circuit elements, and Liang Ge intermediaries translative mode (M2 and M3) indication circuit operates machine interval herein It can increase, and four power switch are all acted in intermediary's translative mode, increase switch cost and energy dissipation.
In addition, prior art United States Patent (USP) US 6166527 and US 7176667 are all to determine frequency technology, it is limited to fix The relation of switching frequency and bandwidth, the load reacting condition of such technology all can be slow;Furthermore, above-mentioned prior art is in arteries and veins Need more complicated circuit to aid in the realization for rushing frequency modulation(PFM) (Pulse Frequency Modulation, PFM), for example, bear When load electric current is minimum, or PFM can not be reached, such as when input voltage vin is close with output voltage Vout;And it is as shown in Figure 3 Prior art TPS63020 controllers, be equally to determine frequency technology and containing buck translative mode, and it is used is averaged Controlled in Current Mode and Based (average current mode), and further need increase slope equalizer (slope Compensation), with suppress subharmonic concussion (sub-harmonic oscillation) tendency.
Fig. 4 A show another prior art United States Patent (USP) US 2011/0156685A1 framework, buck suitching type electricity Source circuit includes inductance L, four power switch A, B, C, D, and control circuit 30.Circuit 30 is controlled to control four power switch A, B, C, D switching, output voltage Vout is converted to by input voltage vin.Control in circuit 30, error amplifier 32 will be anti- Feedback signal FB (information for representing output voltage Vout) is compared with reference voltage Vref, is produced error amplification signal, is inputted PWM ratios Compared with device 34.In addition, circuit is obtained in the signal relevant with inductive current, input PWM comparators 34, signal ratio is amplified with error Compared with.The output of PWM comparators 34 sends turn-on time generation circuit 37 to, to produce the ON time of switch.Drive circuit 39 According to produced ON time, switch drive signal VA, VB, VC, VD are produced, each power switch A, B, C, D is controlled.This is existing Technology is characterised by, a PWM comparator 34 is only needed in circuit, because only needing to produce one group of ON time.Although this Prior art can use very simple circuit realiration buck suitching type power circuit, but it has the disadvantage, no matter input power It is more than, is less than, or during close to output voltage, the circuit is all operated under buck translative mode, each of which operation cycle all must Switch A, B, C, tetra- switches of D, such as Fig. 4 B shown in 4C, by switch A, C conducting (sense of current such as solid line), and then switch B, D Conducting, so goes round and begins again, thus switch cost also can be larger.
In view of the defect of above prior art, the present invention provides a kind of buck suitching type power circuit, and it has fast The load reacting condition of speed;It is without slope-compensation;It can be applied in PFM operations without complicated circuit control simultaneously;More Further, it can reach with pure decompression translative mode and pure boost conversion pattern, and preferably without buck translative mode Or mediation mode.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, a kind of buck switched-mode power supply electricity is proposed Road, it has quickly load reacting condition;It is without slope-compensation;It can be applied in PFM operations without complexity simultaneously Circuit is controlled;Further, it can reach with pure decompression translative mode and pure boost conversion pattern, and preferably without lifting Press translative mode or mediation mode.
Up to above-mentioned purpose, to say that the invention provides the buck suitching type of set time a kind of with regard to one of viewpoint Power circuit, comprising:One reduction voltage circuit, comprising:One inductance, with first end and the second end;First power of one reduction voltage circuit Switch, its one end and the first end of the inductance are coupled, and its other end and an input voltage are coupled;And one reduction voltage circuit power Element, its one end and the first end of the inductance are coupled, its other end ground connection;One booster circuit, comprising:The inductance;One boosting electricity First power switch on road, its one end and the second end of the inductance are coupled, its other end ground connection;And one booster circuit power Element, its one end and the second end of the inductance are coupled, and its other end and an output voltage are coupled;And one control circuit, its produce Raw one first set time (constant time) and one second set time, first set time, control decompression electricity Road, second set time, controls the booster circuit;Wherein first set time is that a fixation is not turned on the time (constant-off time), makes the first power switch of the reduction voltage circuit be not turned in the time being not turned in the fixation, should Second set time was a fixation ON time (constant-on time), made the first power switch of the booster circuit at this It is conducting in fixed ON time.
In above-mentioned buck suitching type power circuit, the power component of reduction voltage circuit or the power component of booster circuit can be Switch or diode.
Up to above-mentioned purpose, to be sayed with regard to another viewpoint, circuit is controlled present invention provides one kind, to control a fixation The buck suitching type power circuit of time, the buck suitching type power circuit of the set time, comprising:One reduction voltage circuit, Comprising:One inductance, with first end and the second end;First power switch of one reduction voltage circuit, its one end and the first of the inductance End coupling, its other end and an input voltage are coupled;And one reduction voltage circuit power component, the first of its one end and the inductance End coupling, its other end ground connection;One booster circuit, comprising:The inductance;First power switch of one booster circuit, its one end with The second end coupling of the inductance, its other end ground connection, the power component of a booster circuit, its one end and the second end coupling of the inductance Connect, its other end and an output voltage are coupled;The control circuit is included:One error amplifier, will be relevant with output voltage anti- Signal is presented compared with a reference voltage, error amplification signal is produced;One the oneth PWM comparators, will be with one first inductance electricity Stream relevant signal or one first sawtooth waveforms signal, compare with error amplification signal;One the 2nd PWM comparators, will be with one The relevant signal of second inductive current or one second sawtooth waveforms signal, compare with error amplification signal;One displacement signal is produced Raw device so that the relevant signal of first inductive current or the first sawtooth waveforms signal, the news relevant with second inductive current Number or the second sawtooth waveforms signal between, the displacement signal that difference displacement signal generator is produced;One first set time produced Raw device, it produces first set time according to the output of the first PWM comparators;One second set time generator, its root According to the output of the 2nd PWM comparators, second set time is produced;One first drive circuit, when it is according to first fixation Between generator output, produce step-down switching control signal, control the reduction voltage circuit;And one second drive circuit, its basis The output of the second set time generator, produces boosted switch control signal, controls the booster circuit.Wherein first fixation Time is that a fixation is not turned on the time (constant-off time), the first power switch of the reduction voltage circuit is fixed at this It is not turned on to be not turned in the time, second set time is a fixation ON time (constant-on time), makes the liter First power switch of volt circuit is conducting in the fixation ON time.
In above-mentioned buck suitching type power circuit, the displacement signal wherein in the control circuit, preferably greater than this first The peak-to-valley value of the relevant signal of inductive current or the first sawtooth waveforms signal so that the buck suitching type power circuit is only grasped Make in decompression translative mode or boost conversion pattern, but without buck translative mode.
Up to above-mentioned purpose, to be sayed with regard to another viewpoint, set time buck suitching type is controlled the invention provides one kind The method of power circuit, the buck suitching type power circuit of the set time, comprising:One reduction voltage circuit, comprising:One inductance, With first end and the second end;First power switch of one reduction voltage circuit, its one end and the first end of the inductance are coupled, and its is another End is coupled with an input voltage;And one reduction voltage circuit power component, the first end of its one end and the inductance couples, and its is another End ground connection;One booster circuit, comprising:The inductance;First power switch of one booster circuit, its one end and the second end of the inductance Coupling, its other end ground connection;The power component of one booster circuit, the second end of its one end and the inductance is coupled, its other end with One output voltage is coupled;The control method is included:When producing one first set time (constant time) with one second fixation Between, first set time, the reduction voltage circuit is controlled, second set time, control the booster circuit;Wherein first fixation Time is that a fixation is not turned on the time (constant-off time), the first power switch of the reduction voltage circuit is fixed at this It is not turned on to be not turned in the time, second set time is a fixation ON time (constant-on time), makes the liter First power switch of volt circuit is conducting in the fixation ON time.
Below by way of specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its The effect reached.
Brief description of the drawings
Figure 1A shows a kind of buck suitching type power circuit of prior art and its schematic diagram of interlock circuit;
Figure 1B is the signal waveform schematic diagram corresponding to Figure 1A circuits;
Fig. 2A shows a kind of buck suitching type power circuit of prior art and its schematic diagram of interlock circuit;
Fig. 2 B are the state transition table (state machine) corresponding to Fig. 2A circuits;
Fig. 3 shows a kind of buck suitching type power circuit of prior art and its schematic diagram of interlock circuit;
Fig. 4 A show a kind of buck suitching type power circuit of prior art and its schematic diagram of interlock circuit;
Fig. 4 B are the signal waveform schematic diagram corresponding to Fig. 4 A circuits;
Fig. 4 C are the sense of current schematic diagram corresponding to Fig. 4 A circuits;
The first embodiment of the buck suitching type power circuit of Fig. 5 display present invention;
Fig. 6 A, 6B are the signal waveform schematic diagram corresponding to Fig. 5 circuits;
Fig. 7 A show the schematic diagram of a kind of step-up/step-down circuit and its interlock circuit;
The preferable electric current direction schematic diagram of the buck suitching type power circuit embodiment of Fig. 7 B display present invention;
The second embodiment of the buck suitching type power circuit of Fig. 8 display present invention;
Fig. 9 A, 9B are the signal waveform schematic diagram corresponding to Fig. 8 circuits;
Figure 10, two embodiments of the voltage type buck suitching type power circuit of the 11 display present invention;
The buck suitching type power circuit of Figure 12-14 display present invention, with diode as the other several of power component Individual embodiment.
Symbol description in figure
20 control circuits
22 buck suitching type power circuits
24,25,34 PWM comparators
32 error amplifiers
39 drive circuits
30 control circuits
40,45 buck suitching type power circuits
50,55,60,65,70,75,80 buck suitching type power circuits
100 reduction voltage circuits
200 booster circuits
300 control circuits
301 secondary controls level circuit
302 error amplifiers
303 displacement signals
304,306 PWM comparators
310,314 drive circuits
316 zero current circuit for detecting
A, B, C, D power switch
Signal CSBCK, CSBST related to inductive current
EAO errors amplify signal
FB feedback signals
L inductance
OSC shakes waveform
VA, VB, VC, VD switch drive signal
Vea, Vea1, Vea2 error amplify signal
Vin input voltages
Vout output voltages
Vref reference voltages
VX, VY zig-zag
Embodiment
Fig. 5 is refer to, by taking current control formula, the framework of double set times as an example, illustrates one embodiment of the present invention. The buck suitching type power circuit 50 of the present embodiment includes reduction voltage circuit 100, booster circuit 200, and control circuit 300. Wherein reduction voltage circuit 100 includes inductance L, two power switch A, B;Wherein booster circuit 200 is opened comprising inductance L, two power Close C, D.Control circuit 300 to control four power switch A, B, C, D switching, input voltage vin is converted into output voltage Vout.Control in circuit 300, error amplifier 302 is electric by feedback signal FB (information for representing output voltage Vout) and reference Pressure Vref compares, and produces error amplification signal EAO, input PWM comparator 304 and PWM comparators 306.In addition, circuit obtain with In the relevant signal CSBCK of inductive current, input PWM comparator 304, compared with error amplification signal EAO.Furthermore, circuit production A raw displacement signal 303, superposition is in after the relevant signal CSBCK of the inductive current, as the relevant news of another inductive current In number CSBST, input PWM comparator 306.The output of PWM comparators 304 sends fixation to and is not turned on time generation circuit 308, What is switched with producing is not turned on the time.Drive circuit 310 produces switch drive signal VA according to the produced time that is not turned on, VB, control power switch A, B.The output of PWM comparators 306 sends fixed turn-on time generation circuit 312 to, to produce switch ON time.Drive circuit 314 produces switch drive signal VC, VD according to produced ON time, controls power switch C,D。
Refer to Fig. 6 A, now buck suitching type power circuit 50 operates in pure decompression translative mode, EAO will not with The related signal CSBST of inductive current intersects, therefore VC perseverances are low, and switch C perseverances are not turned on, and VD perseverances are height, switch D perseverance conductings;Open Close A to turn in t0, signal CSBCK now related to inductive current is begun to ramp up, until EAO is related to inductive current Signal CSBCK intersects, and is now t1, and switch A is not turned in t1, and is persistently not turned on one section of fixation and is not turned on time TOFF, Then turned on again when t2, so repeatedly;Above-mentioned operational control make it that this pure decompression translative mode is Peak Current Mode Formula (Peak Current Mode).Fig. 6 B are referred to again, and now buck suitching type power circuit 50 operates in pure boost conversion Pattern, the signal CSBCK that EAO will not be related to inductive current intersects, therefore VB perseverances are low, and switch B is not turned on, and VA perseverances are height, Switch A perseverance conductings;Switch C is not turned on when T0, and now inductive current is begun to decline, until the EAO news related to inductive current Number CSBST intersects, and switch C is turned on when t1, and the fixed ON time TON of one section of constant conduction, then when t2 again not Conducting, so repeatedly;Above-mentioned operational control causes this pure boost conversion pattern to be valley-current mode (Valley Current Mode)。
It is a feature of the present invention that according to the output result of PWM comparators 308 and PWM comparators 312, producing two groups and consolidating Fix time, one is not turned on the time for fixed ON time, one for fixation, to control booster circuit 200 and reduction voltage circuit 100, So that be all set time operation when pure boost conversion pattern is with pure decompression translative mode operation, herein under two operator schemes, All there is Fast Load to react, and without the advantage of slope-compensation.
Fig. 7 A are referred to, step-up/step-down circuit 40 is containing reduction voltage circuit 100 and booster circuit 200, and step-up/step-down circuit 40 is defeated It is pure decompression translative mode when entering voltage Vin more than output voltage Vout, is when input voltage vin is less than output voltage Vout Pure boost conversion pattern, and when input voltage vin is close with output voltage Vout, preferably it is expected that step-up/step-down circuit 40 is not grasped Make in the buck translative mode as shown in Fig. 4 C or Figure 1B, to reach the effect of reduction switch cost;Preferably operation is such as Fig. 7 B arrows are shown in solid, the switch A of step-up/step-down circuit 45, and D, ON time extends as much as possible, without entering mediation mode Or buck translative mode.
Referring to Fig. 5, another feature of the present invention is, consolidating for the generation of time generator 308 is not turned on according to fixed Surely time TOFF is not turned on, reduction voltage circuit 100 is controlled, the fixation ON time produced according to fixed ON time generator 312 TON, controls reduction voltage circuit 200, and so combination allows to switch A, and D unrestrictedly extends.Further, should in preferably selection Control circuit 300 in displacement signal 303, make CSBST valley be more than CSBCK peak value (equivalent to making, displacement signal 303 is big In CSBCK peak-to-valley value) so that control circuit 300 of the invention can make buck suitching type power circuit 50, in input electricity To be depressured translative mode when pressure is more than output voltage, input voltage is boost conversion pattern when being less than output voltage, and in input When voltage Vin is close with output voltage Vout, because the slope of inductive current is extremely gentle, and due to above-mentioned conducting/no The combination of ON time and the preferable selection of displacement signal, make switch A, D unrestrictedly be extended, now buck suitching type Power circuit 50 is operated under pulse frequency modulated pattern (PFM).Many such buck switchings containing four power components Formula power circuit is decompression translative mode, input voltage when input voltage vin is more than output voltage Vout in the prior art It is boost conversion pattern when Vin is less than output voltage Vout, and when input voltage vin is close with output voltage Vout, all can Into buck translative mode, or mediation mode, but the present invention can preferably be set as without buck translative mode or It is mediation mode, can so avoids buck suitching type power circuit from entering buck-boost mode, or mediation mode, and then reach Reduce the effect of switch cost.
Another feature of the present invention is, the described control circuit for being used to control this buck suitching type power circuit, Except it can be operated under continuous conduction mode (Continuous Conduction Mode, CCM) outside, it can also be applied to easily Discontinuous conduction mode (Discontinuous Conduction Mode, DCM) and pulse frequency modulated (Pulse Frequency Modulation, PFM) under pattern.Referring to Fig. 8, in buck suitching type power circuit 55, such as but not limiting Add, such as, but not limited to the zero current signal produced by a zero current circuit for detecting 316, make in drive circuit 310,314 Inductive current when descending through zero current by positive current, controlling switch B or D is are not turned on, and it is not negative value to make inductive current, this When buck suitching type power circuit 55 operate under discontinuous conduction mode.It is buck suitching type electricity shown in 9B such as Fig. 9 A Source circuit 55 is operated under discontinuous conduction mode, power switch A, B, C, D control signal, and inductive current waveform. In addition, under the minimum situation of load current, buck suitching type power circuit 55 will enter pulse frequency modulated PFM moulds Formula, frequency can automatic frequency reducing, the extra control circuit without complexity.
Fig. 5 and Fig. 8 be shown be current control formula buck suitching type power circuit framework, but the present invention similarly may be used Switched-mode power supply circuit framework applied to voltage type (voltage mode).Figure 10 and Figure 11 shows CCM and DCM respectively Voltage type buck suitching type power circuit 60,65, wherein one of input of PWM comparators 304 receive error put Sawtooth waveforms signal produced by inside big signal EAO, other end receiving circuit;One of input of PWM comparators 306, which is received, to be missed A displacement signal 303 on sawtooth waveforms signal superposition produced by inside difference amplification signal EAO, other end receiving circuit.Sawtooth waveforms The producing method of signal has the various practices with waveform, is well known to those skilled in the art, because of non-invention application emphasis, therefore not Give and repeating.
Invention is not limitedly applied to the synchronization with four power switch (synchronous) buck switched-mode power supply In circuit.Figure 12-14 is booster circuit 200, reduction voltage circuit 100 and the various combination of drive circuit 310,314 in Fig. 5,8,10,11 Embodiment, wherein secondary control level circuit 301 is such as, but not limited to Fig. 5, the secondary control level circuit 301 in 8,10,11:Figure 12 Illustrated embodiment, wherein switch B is replaced by diode.Embodiment illustrated in fig. 13 wherein switchs D and replaced by diode.Shown in Figure 14 Embodiment, wherein switching B, D is all replaced by diode.And the embodiment of the above can be applicable to above-mentioned current type, voltage-type, Buck suitching type power circuit under DCM, CCM pattern, using two PWM comparators, produces two groups of fixations as the aforementioned and leads It lead to/is not turned on the time and is controlled by.
Illustrate the present invention for preferred embodiment above, it is described above, only it is easy to those skilled in the art Solve present disclosure, not for limit the present invention interest field.Under the same spirit of the present invention, people in the art Member can think and various equivalence changes.For example, each power switch A, B, C, D can be PMOS or NMOS, and PWM comparators 304, 306 positive-negative input end can make corresponding conversion;And CSBCK, CSBST can also do corresponding change with the positive and negative of displacement signal 303 Change.Therefore, the scope of the present invention should cover above-mentioned and other all equivalence changes.

Claims (10)

1. the buck suitching type power circuit of a kind of set time, it is characterised in that include:
One reduction voltage circuit, comprising:
One inductance, with first end and the second end;
First power switch of one reduction voltage circuit, its one end and the first end of the inductance are coupled, its other end and an input voltage Coupling;And
The power component of one reduction voltage circuit, its one end and the first end of the inductance are coupled, its other end ground connection;
One booster circuit, comprising:
The inductance;
First power switch of one booster circuit, its one end and the second end of the inductance are coupled, its other end ground connection;And
The power component of one booster circuit, its one end and the second end of the inductance are coupled, and its other end and an output voltage are coupled; And
One control circuit, it produces one first set time and one second set time, first set time, controls the decompression Circuit, second set time, controls the booster circuit;Wherein first set time is that a fixation is not turned on the time, makes this First power switch of reduction voltage circuit is not turned in the time being not turned in the fixation, and second set time is a fixation conducting Time, the first power switch for making the booster circuit is conducting in the fixation ON time.
2. the buck suitching type power circuit of set time as claimed in claim 1, wherein, the buck switched-mode power supply Circuit only operates in decompression translative mode or boost conversion pattern, but without buck translative mode.
3. the buck suitching type power circuit of set time as claimed in claim 1 or 2, wherein, the control circuit includes:
One error amplifier, the feedback signal relevant with output voltage is compared with a reference voltage, produces error amplification Signal;
One the oneth PWM comparators, by the signal relevant with one first inductive current or one first sawtooth waveforms signal, and the error Amplification signal compares;
One the 2nd PWM comparators, the signal relevant with one second inductive current or one second sawtooth waveforms signal, and the error are put Big signal compares;
One displacement signal generator, produces a displacement signal, to cause the relevant signal of first inductive current or first saw Tooth ripple signal, between the signal relevant with second inductive current or the second sawtooth waveforms signal, differs the displacement signal;
One first set time generator, it produces first set time according to the output of the first PWM comparators;
One second set time generator, it produces second set time according to the output of the 2nd PWM comparators;
One first drive circuit, it produces step-down switching control signal, control according to the output of the first set time generator The reduction voltage circuit;And one second drive circuit, it produces boosted switch control according to the output of the second set time generator Signal processed, controls the booster circuit.
4. the buck suitching type power circuit of set time as claimed in claim 3, wherein, the reduction voltage circuit, the boosting Circuit, step-down switching control signal, and boosted switch control signal, are the one of which of following combination:
(1)
The power component of the reduction voltage circuit is the second power switch of a reduction voltage circuit;
The power component of the booster circuit is the second power switch of a booster circuit;
The step-down switching controls signal, to control the first power switch of the reduction voltage circuit and the second power of the reduction voltage circuit Switch;And
The boosted switch controls signal, to control the first power switch of the booster circuit and the second power of the booster circuit Switch;
(2)
The power component of the reduction voltage circuit is a buck diode;
The power component of the booster circuit is the second power switch of a booster circuit;
The step-down switching controls signal, the first power switch to control the reduction voltage circuit;And
The boosted switch controls signal, to control the first power switch of the booster circuit and the second power of the booster circuit Switch;
(3)
The power component of the reduction voltage circuit is the second power switch of a reduction voltage circuit;
The power component of the booster circuit is a booster diode;
The step-down switching controls signal, to control the first power switch of the reduction voltage circuit and the second power of the reduction voltage circuit Switch;And
The boosted switch controls signal, the first power switch to control the booster circuit;And
(4)
The power component of the reduction voltage circuit is a buck diode;
The power component of the booster circuit is a booster diode;
The step-down switching controls signal, the first power switch to control the reduction voltage circuit;And
The boosted switch controls signal, the first power switch to control the booster circuit.
5. the buck suitching type power circuit of set time as claimed in claim 4, wherein, the position in the control circuit Move signal, the signal relevant more than first inductive current or the peak-to-valley value of the first sawtooth waveforms signal so that
Above-mentioned (one) has following characteristics:
When being depressured translative mode, the first power switch of the reduction voltage circuit is not turned on/turned on first set time, the decompression First power switch anti-phase switching of second power switch of circuit when continuous conduction mode is operated with the reduction voltage circuit, and When discontinuous conduction mode is operated, except the first power switch in the reduction voltage circuit and the second power switch of the reduction voltage circuit Under the situation being all not turned on, the second power switch of the reduction voltage circuit and the anti-phase switching of the first power switch of the reduction voltage circuit; The first power switch perseverance of the booster circuit is turned on, and the second switch perseverance of the booster circuit is not turned on;
In boost conversion pattern, the first power switch of the booster circuit turns on/is not turned on second set time, the boosting First power switch anti-phase switching of second power switch of circuit when continuous conduction mode is operated with the booster circuit, and When discontinuous conduction mode is operated, except being opened in the first power switch of the booster circuit with the second power of the booster circuit Close under the situation that is all not turned on, the second power switch of the booster circuit with the first power switch of the booster circuit is anti-phase cuts Change;The first power switch perseverance of the reduction voltage circuit is turned on, and the second power switch perseverance of the reduction voltage circuit is not turned on;
Above-mentioned (two) have following characteristics:
When being depressured translative mode, the first power switch of the reduction voltage circuit is not turned on/turned on first set time, the boosting The first power switch perseverance of circuit is turned on, and the second power switch perseverance of the booster circuit is not turned on;
In boost conversion pattern, the first power switch of the booster circuit turns on/is not turned on second set time, the boosting First power switch anti-phase switching of second power switch of circuit when continuous conduction mode is operated with the booster circuit, the drop The first power switch perseverance conducting of volt circuit;
Above-mentioned (three) have following characteristics:
When being depressured translative mode, the first power switch of the reduction voltage circuit is not turned on/turned on first set time, the decompression First power switch anti-phase switching of second power switch of circuit when continuous conduction mode is operated with the reduction voltage circuit, and When discontinuous conduction mode is operated, except the first power switch in the reduction voltage circuit and the second power switch of the reduction voltage circuit Under the situation being all not turned on, the second power switch of the reduction voltage circuit and the anti-phase switching of the first power switch of the reduction voltage circuit; The first power switch perseverance conducting of the booster circuit;
In boost conversion pattern, the first power switch of the booster circuit turns on/is not turned on second set time, the decompression The first power switch perseverance of circuit is turned on, and the second power switch perseverance of the reduction voltage circuit is not turned on;And
Above-mentioned (four) have following characteristics:
When being depressured translative mode, the first power switch of the reduction voltage circuit is not turned on/turned on first set time, the boosting The first power switch perseverance conducting of circuit;
In boost conversion pattern, the first power switch of the booster circuit turns on/is not turned on second set time, the decompression The first power switch perseverance conducting of circuit.
6. one kind control circuit, the buck suitching type power circuit to control a set time, the lifting of the set time Suitching type power circuit is pressed to include a reduction voltage circuit and a booster circuit, the reduction voltage circuit is included:One inductance, with first end With the second end;First power switch of one reduction voltage circuit, its one end and the first end of the inductance are coupled, its other end and an input Voltage is coupled;And one reduction voltage circuit power component, the first end of its one end and the inductance couples, its other end ground connection;Should Booster circuit is included:The inductance;First power switch of one booster circuit, its one end and the second end of the inductance are coupled;And The power component of one booster circuit, its one end and the second end of the inductance are coupled, and its other end and an output voltage are coupled;It is special Levy and be, the control circuit is included:
One error amplifier, the feedback signal relevant with output voltage is compared with a reference voltage, produces error amplification Signal;
One the oneth PWM comparators, the signal relevant with one first inductive current or one first sawtooth waveforms signal, and the error are put Big signal compares;
One the 2nd PWM comparators, the signal relevant with one second inductive current or one second sawtooth waveforms signal, and the error are put Big signal compares;
One displacement signal generator so that the relevant signal of first inductive current or the first sawtooth waveforms signal, with this second Between the relevant signal of inductive current or the second sawtooth waveforms signal, the displacement signal that difference displacement signal generator is produced;
One first set time generator, it produces first set time according to the output of the first PWM comparators;
One second set time generator, it produces second set time according to the output of the 2nd PWM comparators;
One first drive circuit, it produces step-down switching control signal, controls the reduction voltage circuit according to first set time; And
One second drive circuit, it produces boosted switch control signal, controls the booster circuit according to second set time;
Wherein, first set time is that a fixation is not turned on the time, the first power switch of the reduction voltage circuit is fixed at this It is not turned on to be not turned in the time, second set time is a fixation ON time, opens the first power of the booster circuit Close in the fixation ON time as conducting.
7. circuit is controlled as claimed in claim 6, wherein, the displacement signal, the signal relevant more than first inductive current Or the peak-to-valley value of the first sawtooth waveforms signal so that the set time buck suitching type power circuit only operates in decompression and turned Mold changing formula or boost conversion pattern, but without buck translative mode.
8. a kind of method for controlling set time buck suitching type power circuit, the buck switched-mode power supply of the set time Circuit includes a reduction voltage circuit and a booster circuit, and the reduction voltage circuit is included:One inductance, with first end and the second end;One drop First power switch of volt circuit, its one end and the first end of the inductance are coupled, and its other end and an input voltage are coupled;And The power component of one reduction voltage circuit, its one end and the first end of the inductance are coupled, its other end ground connection;The booster circuit is included: The inductance;First power switch of one booster circuit, its one end and the second end of the inductance are coupled;And one booster circuit work( Rate element, its one end and the second end of the inductance are coupled, and its other end and an output voltage are coupled;Characterized in that, the control Method is included:
One first set time and one second set time are produced,
First set time, the reduction voltage circuit is controlled, second set time, control the booster circuit;
Wherein, first set time is that a fixation is not turned on the time, the first power switch of the reduction voltage circuit is fixed at this It is not turned on to be not turned in the time, second set time is a fixation ON time, opens the first power of the booster circuit Close in the fixation ON time as conducting.
9. the method for set time buck suitching type power circuit is controlled as claimed in claim 8, wherein, the generation first The step of set time is with the second set time includes:
The feedback signal relevant with output voltage is compared with a reference voltage, error amplification signal is produced;
By the signal relevant with one first inductive current or one first sawtooth waveforms signal, compared with error amplification signal;
The relevant signal of first inductive current or the first sawtooth waveforms signal are added into a displacement signal, one second inductance is produced Current related signal or one second sawtooth waveforms signal;
By the signal relevant with second inductive current or the second sawtooth waveforms signal, compared with error amplification signal;
According to the output of the first PWM comparators, first set time is produced;And
According to the output of the 2nd PWM comparators, second set time is produced.
10. the method for set time buck suitching type power circuit is controlled as claimed in claim 9, wherein, displacement news Number, the signal relevant more than first inductive current or the peak-to-valley value of the first sawtooth waveforms signal so that the set time lifts Pressure suitching type power circuit only operates in decompression translative mode or boost conversion pattern, but without buck translative mode.
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