CN109067178A - A kind of control system and method for same phase buck-boost converter mode smooth switching - Google Patents
A kind of control system and method for same phase buck-boost converter mode smooth switching Download PDFInfo
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- CN109067178A CN109067178A CN201811030119.8A CN201811030119A CN109067178A CN 109067178 A CN109067178 A CN 109067178A CN 201811030119 A CN201811030119 A CN 201811030119A CN 109067178 A CN109067178 A CN 109067178A
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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
- H02M3/1582—Buck-boost 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of control technology of same four pipe buck-boost converter of phase more particularly to a kind of control systems and method of same phase buck-boost converter mode smooth switching.The principle of the invention is to clamp the minimum turn-on time of control circuit power tube SC and SB in tmin, by power tube SA and SD, maximum turn-on time is set as t under Buck mode and Boost modeAD0, and the power tube SA and SD that can be realized above-mentioned solution simultaneously turn on the time as tAD1Control, then control circuit realizes smooth pattern switching.Power tube turn-on and turn-off time in control method clamping mode handoff procedure of the present invention, influence of the deadband eliminating time to output voltage reduce the ripple of system, improve the stability of system；And the average inductor current under Buck-Boost mode is reduced, efficiency is improved；This control method realizes the four pipe One Buck-Boost converter body of same phase that simply can be used for any voltage-mode control.
Description
Technical field
The present invention relates to a kind of control technologies of same four pipe buck-boost converter of phase, more particularly to a kind of same mutually lifting buckling
The control system and method for parallel operation mode smooth switching.
Background technique
Inexpensive, expeditiously in time it can boost and drop under wide input voltage with four pipe buck-boost converter of phase
Pressure, is widely used in power amplifier, photovoltaic DC-to-AC converter and mobile power supply equipment.
In order to expeditiously convert voltage, the operating mode of same four pipe buck-boost converter of phase is divided into Buck mould
Formula, Buck-Boost mode and Boost mode, wherein mistake of the Buck-Boost mode as Buck mode and Boost mode
It crosses, to reduce the spike generated in mode handover procedure.It is as shown in Figure 1A a kind of control of solution pattern switching of the prior art
Method circuit diagram processed, wherein capacitor C1, C2 and C3 is the outer capacitor of piece, and SW1 and SW2 are the voltage at the both ends inductance L, SA and SC
For power switch tube, SB and SD are synchronous rectification power tube.According to input voltage VIN and output current requirements, control circuit control
The turn-on and turn-off of power tube in film-making adjust output voltage VO UT.In control circuit, sampled voltage V is exportedSWith reference electricity
Press VREF, the input terminal as error amplifier Amp.The output signal of error amplifier is VC, VC and overlapping ramp signal
VBoost, VBuck are compared by comparator COM1, and ramp signal VBoost and the VBuck period is Ts, output signal is through overdriving
Circuit Driver controls power tube SA, SB, SC and SD turn-on and turn-off.
As shown in Figure 1B, VmaxAnd VLFor the maximum value and minimum value of VBoost, VHAnd VminFor the maximum value and most of VBuck
Small value.When system work is under Buck mode, error signal VC is only compared with VBUCK；System works in Boost mode, VC
Only compared with VBoost；System works in Buck-Boost mode, and VC is simultaneously compared with VBoost and VBuck.When driving is believed
When number VO1 is high level/low level, power tube SA ON/OFF, while power tube SB shutdown/conducting；As driving signal VO2
When for high level/low level, power tube SD ON/OFF, power tube SC shutdown/conducting.
But since the presence of power tube dead time, Buck mode and Boost mode are the same as the Buck-Boost mould of transition
The jump that voltage and current is still remained in formula handoff procedure influences the stability of system.For example, when system is rigid from Buck mode
Into Buck-Boost mode, since the low level duration of the signal VO2 of control power tube SD is lower than dead time, power
Pipe parasitic capacitance charge and discharge are insufficient, and power tube SC is caused to have little time to be connected, and power tube SD has little time to turn off, then DC voltage turns
It changes than remaining unchanged, thus, output voltage follows input voltage to decline；As input voltage continues to reduce, when VO2 low level is held
When the continuous time rises above dead time, power tube parasitic capacitance charge and discharge are more than threshold value, and power tube SC and SD normally switch,
DC voltage conversion causes output voltage to generate jump than increasing.Similarly, from Buck-Boost pattern switching to Boost mode
It is also such.Therefore, it is necessary to influence of the power tube dead time to output voltage be eliminated, to improve output voltage in pattern switching
Stability in the process.
Summary of the invention
The purpose of the present invention is to provide the control system and method for a kind of same phase buck-boost converter mode smooth switching,
The system influence of power tube dead time to output voltage in mode handover procedure can be eliminated, realizes smooth mode switching.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals:
A kind of control system of same phase buck-boost converter mode smooth switching, which is characterized in that become in Buck-Boost
In the control circuit changed install additional a clamp element, the clamp element can by One Buck-Boost converter body with four pipe group of phase
The minimum turn-on time of the power tube SC and SB of part are clamped in tmin, by power tube SA and SD under Buck mode and Boost mode
Maximum turn-on time is set as tAD0, wherein tminAnd tAD0For setting value, and defines power tube SA and power tube SC and simultaneously turns on,
Working time is tAC；Power tube SA and power tube SD are simultaneously turned on, working time tAD；Power tube SB and power tube SD are simultaneously
The time of conducting is tBD；When system work in Buck mode, tAD+tBD=Ts,tAC=0；When system works in Boost mode
When, tAD+tBD=TS,tAC+tAD=Ts, tBD=0, tAD0=aTS；tmin=bTs。
In a kind of above-mentioned control system of same phase buck-boost converter mode smooth switching, the clamp element include according to
The clamp module and pulse generation module of secondary connection, the clamp element input connect the comparator group of One Buck-Boost converter body
Part, output connect in One Buck-Boost converter body with the driver of four pipe of phase.
In a kind of control system of above-mentioned same phase buck-boost converter mode smooth switching, the comparator component includes
Comparator Com1, comparator Com2 and comparator Com3；The output sampled voltage V of sampling resistorSWith reference voltage VREF,
Input terminal as error amplifier Amp；The output signal of error amplifier is error signal VC, and comparator Com1 is by VBUCKWith
VBOOSTControl signal VO1 and VO2 are exported compared with error signal VC and are given clamp element Clamp by sawtooth wave；Comparator Com2
Use signal V respectively with Com3HWith signal VLCompared with error signal VC, control signal CON is generated, and export to clamp element
Clamp, wherein VHFor VBuckThe peak value of sawtooth wave, VLFor VBoostThe valley of sawtooth wave.
In a kind of control system of above-mentioned same phase buck-boost converter mode smooth switching, include: with four tube assembly of phase
The pipe of same phase four of power switch tube S A, power switch tube S C, synchronous rectification power tube SB and synchronous rectification power tube SD composition, and
It is connect simultaneously with drive module；The one end inductance L is connect with power switch tube S A and synchronous rectification power tube SB simultaneously, and the other end is same
When connect with power switch tube S C and synchronous rectification power tube SD；Synchronous rectification power tube SD output is connected with load, with phase four
The adjusting output voltage of tube assembly is VOUT；The outer capacitor C1 of piece connects input and the ground connection of same four tube assembly of phase；The outer capacitor C2 of piece connects
Output and ground connection with four tube assembly of phase；The outer capacitor C3 of piece connects output and the ground connection of error amplifier Amp.
In a kind of control system of above-mentioned same phase buck-boost converter mode smooth switching, tAD0=0.85TS；tmin=
0.05Ts。
A kind of control method of same phase buck-boost converter mode smooth switching, which is characterized in that the Buck- of transition
It is initially power tube SA and SD conducting, followed by power tube SA and SC are connected, most in a switch periods in Boost mode
After be power tube SB and SD conducting；, and will can be managed in One Buck-Boost converter body with phase four respectively in a switch periods
The minimum time that the power tube SA and SC of component are simultaneously turned on is clamped in tmin, minimum time that power tube SB and SD are simultaneously turned on
Clamp is in tmin, the power tube SA and SD maximum time simultaneously turned under Buck mode and Boost mode is set as tAD0,
In, tminAnd tAD0For setting value, and defining power tube SA and power tube SC to simultaneously turn on the working time is tAC；Power tube SA and function
Rate pipe SD simultaneously turns on the working time as tAD；The time that power tube SB and power tube SD are simultaneously turned on is tBD；When system work exists
When Buck mode, tAD+tBD=Ts,tAC=0；When system work in Boost mode, tAD+tBD=Ts,tAC+tAD=TS, tBD=
0, tAD0=aTS；tmin=bTs。
In a kind of control method of above-mentioned same phase buck-boost converter mode smooth switching, power tube SA and power tube SC
Simultaneously turning on the working time is tAC；Power tube SA and power tube SD simultaneously turns on the working time as tAD；Power tube SB and power tube
The time that SD is simultaneously turned on is tBD；When system work in Buck mode, tAD+tBD=Ts,tAC=0, and have
Wherein, MVBuckIndicate that Buck mode will switch to the DC voltage conversion ratio at Buck-Boost mode moment,
MVBB1Indicate DC voltage conversion ratio when just switching to Buck-Boost mode, MVBB2Expression will switch to Boost mode
When DC voltage convert ratio, MVBoostIndicate DC voltage conversion ratio when just switching to Boost mode；tAD0For setting
Power tube SA and SD maximum turn-on time under Buck mode and Boost mode；If mode smooth switches, formula (3) and formula (4)
Equal, formula 5 and formula 6 are equal；Enable above-mentioned two formula difference equal, then can determine from Buck mode or Boost pattern switching to
This moment of Buck-Boost mode, the time interval that power tube SA and SD are simultaneously turned on are ttD1。
In a kind of control method of above-mentioned same phase buck-boost converter mode smooth switching, as input voltage reduces,
The operating mode of converter, again to Boost mode, is specifically included from Buck mode to Buck-Boost mode:
Step 1: error signal VCLower than VLWhen, in Buck mode, power tube SA and SB control voltage conversion for system work
Than, wherein VLIt is VBOOSTThe valley of sawtooth wave；
Step 2: error signal VCSlowly rise above VLWhen, minimum time that lamp power pipe SA and SC while is connected
tmin, time that power tube SA and SD while is connected is from tAD0Moment drops to tAD1The time that power tube SB and SD are simultaneously turned on
With VCSlowly rise and become smaller, the time that power tube SA and SD are simultaneously turned on is with VCSlowly rise and become larger, until tADFrom
tAD1Rise to tAD0；
Step 3: error signal VCContinue to rise, the time that power tube SA and SD are simultaneously turned at this time is always tAD0, power
The time that pipe SA and SC are simultaneously turned on no longer clamps, with VCRise and become larger, the time that power tube SB and SD are simultaneously turned on is with VCOn
It rises and becomes smaller, until tBDIt is reduced to tmin；
Step 4: error signal VCContinue to rise and lower than VHWhen, when the minimum that lamp power pipe SB and SD while is connected
Between tmin；The time that power tube SA and SC are simultaneously turned on is with VCSlowly rise and become larger, power tube SA and SD simultaneously turn on when
Between with VCSlowly rise and reduce, until tADFrom tAD0It is reduced to tAD1, while VCEqual to VH；Wherein, VHIt is VBUCKSawtooth wave
Peak value；
Step 5: error signal VCContinue to rise and is higher than VHWhen, system work is in Boost operating mode, no longer clamp function
The minimum time be connected while rate pipe SB and SD；The time be connected while power tube SA and SD is from tAD1Moment rises to
tAD0, power tube SC and SD control voltage conversion ratio.
In a kind of control method of above-mentioned same phase buck-boost converter mode smooth switching, tAD0=0.85TS；tmin=
0.05ts。
Therefore, the present invention has the advantage that power tube in control method clamping mode handoff procedure of the present invention
Turn-on and turn-off time, influence of the deadband eliminating time to output voltage reduce the ripple of system, improve the stability of system；
And the average inductor current under Buck-Boost mode is reduced, efficiency is improved；This control method is realized simply, can be used for
The four pipe One Buck-Boost converter body of same phase of any voltage-mode control.
Detailed description of the invention
Control method of Figure 1A tradition with four pipe One Buck-Boost converter body of phase.
Waveform diagram of Figure 1B tradition with the control method of four pipe One Buck-Boost converter body of phase.
Relationship of the Fig. 2 with four pipe One Buck-Boost converter body error output voltage and dc transfer ratio of phase.
The crucial control module of the deadband eliminating Fig. 3 time effects.
The control method that Fig. 4 A is proposed is from Buck pattern switching to the key waveforms of Buck-Boost mode.
The control method that Fig. 4 B is proposed is from Buck-Boost pattern switching to the key waveforms of Boost mode.
Fig. 5 is by taking LED constant current drives as an example, the system architecture diagram of the control method proposed.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment:
Preferred embodiment of the invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to this reality
Apply example.The present invention covers any substitution made on the essence and scope of the present invention and modification, equivalent method and scheme.For
So that the public is had thorough understanding to the present invention, in following present invention preferred embodiments concrete details is described in detail, and it is right
The present invention can also be understood completely in description for those skilled in the art without these details.
The input voltage of lithium battery can slowly be reduced with the time is used, and generally be reduced to 2.7V from 4.7V.Due to four
The duty ratio of a power switch tube will not be mutated, and when input voltage reduces, output voltage can also reduce simultaneously, error signal VC
It increases, and then adjusts duty ratio, to stabilize the output voltage.In the case of steady operation, input voltage generates minor change Δ VIN
When, the approximately linear relationship of changes delta VO and input voltage minor change Δ VIN of output voltage, the change Δ VC of error signal
Changes delta VO with output voltage is also what approximately linear changed.So as shown in Fig. 2, in converter mode handover procedure,
If voltage conversion ratio M at two critical points A and BVIt is smooth and continuous, then illustrate that converter realizes smooth mode switching.
As shown in Figure 1A, the direct current of same four pipe One Buck-Boost converter body of phase can be obtained according to voltage-second balance and charge conservation
Characteristic, such as formula (1) and (2):
Wherein, ILFor the average current for flowing through inductance, IOFor load current.Buck-Boost mode is divided into three kinds of work shapes
State, i.e. power tube SA and power tube SC simultaneously turn on, working time tAC；Power tube SA and power tube SD are simultaneously turned on, work
Time is tAD；The time that power tube SB and power tube SD are simultaneously turned on is tBD.When system work in Buck mode, tAD+tBD=
Ts,tAC=0；When system work in Boost mode, tAD+tBD=Ts,tAC+tAD=Ts, tBD=0.It is constant when loading, if tAD+
tBDMuch larger than tAC, then inductance average current I can be reducedL。
As shown in Fig. 2, due to the presence of dead time, at two critical points A and B, it is difficult to determine that accurate direct current turns
Change voltage ratio MV, lead to direct current transfer voltage ratio MVAbout error signal VCCurve it is discontinuous.
The present invention passes through the minimum turn-on time t of lamp power pipe SC and SBmin, to guarantee MVIt is continuous and smooth.Wherein, A
M in the left neighborhood of point and the right neighborhood of A pointVExpression formula be (3) (4)；M in the left neighborhood of B point and the right neighborhood of B pointVExpression formula be (5)
(6):
Wherein, MVBuckIndicate that Buck mode will switch to the DC voltage conversion ratio of Buck-Boost mode, MVBB1Table
Show the DC voltage conversion ratio for just switching to Buck-Boost mode, MVBB2Expression will switch to the direct current of Boost mode
Voltage conversion ratio, MVBoostIndicate the DC voltage conversion ratio for just switching to Boost mode.tAD0For setting power tube SA and
SD maximum turn-on time under Buck mode and Boost mode.If mode smooth switches, formula (3) and formula (4) are equal, formula (5)
It is equal with formula (6).It enables above-mentioned two formula difference equal, then can determine from Buck mode or Boost pattern switching to Buck-
This moment of Boost mode, the time interval t that power tube SA and SD are simultaneously turned onAD1。
That is, as long as control circuit can clamp the minimum turn-on time of power tube SC and SB in tmin, by power
Pipe SA and SD maximum turn-on time under Buck mode and Boost mode is set as tAD0, and can be realized the function of above-mentioned solution
Rate pipe SA and SD simultaneously turn on the time as tAD1Control, then control circuit realizes smooth pattern switching.
The following are specific embodiments.In order to make the public have thorough understanding to the present invention, the preferred embodiment of the invention is detailed
Illustrate concrete details, and this hair can also be understood completely in description without these details for a person skilled in the art
It is bright.
As shown in figure 3, VREF is reference voltage, VSTo export current sampling signal, comparator Com1 is by VBUCKAnd VBOOST
Sawtooth wave is compared with error signal VC, output control signal VO1 and VO2.Comparator Com2 and Com3 use V respectivelyHAnd VLWith error
Signal VC compares, and generates control signal CON to determine operating mode.When CON is high level, system works in Buck-Boost
Mode, pulse generation module Pulse and clamp module Clamp start work.VCL1 and VCL2 is clamp signal, low level pulse
Width is clamped as tmin.The output signal for clamping module Clamp is VAB and VCD, when driving signal VAB is high level/low electricity
Usually, power tube SA ON/OFF, while power tube SB shutdown/conducting；When driving signal VCD is high level/low level,
Power tube SD ON/OFF, power tube SC shutdown/conducting.
Slowly decline with reference to Fig. 4 A explanation with VIN, converter from Buck pattern switching to
The course of work of Buck-Boost mode.When error signal VC is higher than VLWhen, CON is high level, starting impulse hair
Raw device Pulse and clamp circuit Clamp.
Converter, to the incipient stage of Buck-Boost mode, is handed over from Buck pattern switching from VC and VBoost acclivity
More moment trigger Ts-tminThe failing edge of VCL1 is generated, at this point, duration of the VC higher than VBoost is less than tmin, by Vo2
It clamps down on as high level.As error signal VC continues to increase, in a cycle, the failing edge of VCL1 and the failing edge of VBoost
When coincidence, the failing edge of VCL1 is determined by the failing edge of VBOOST；Meanwhile when duration of the VC higher than VBoost is greater than tmin,
VO2 is no longer clamped, and according to low and high level conversion is carried out shown in Fig. 4 A, i.e. VC is low level when being higher than VBoost, otherwise is height
Level.VCL1 and VO2 obtains VCD signal by logical AND circuit.
Converter rises from Buck pattern switching to the incipient stage of Buck-Boost mode, error signal VC and VBoost
More moment and decline slop friendship more the time interval at moment is handed over to be denoted as t in slope1(t), when being handed over more from VC and VBoost acclivity
Carve trigger t2(t)=(Ts-tAD0)-t1(t) failing edge of VCL2 is generated.As error signal VC continues to increase, when one
When the rising edge of VCL2 is overlapped with the failing edge of VBuck in period, the rising edge of VCL2 is determined by the failing edge of VBuck.VO1 is pressed
According to low and high level conversion is carried out shown in Fig. 4 A, i.e. VC is high level when being higher than VBuck, otherwise is low level.VCL2 and VO1 passes through
Logical AND circuit obtains VAB signal.
Illustrate the course of work from Buck-Boost pattern switching to Boost mode with reference to Fig. 4 B.At pattern switching initial stage,
VO1 is high level when being higher than VBuck, otherwise is low level according to low and high level conversion, i.e. VC is carried out shown in Fig. 4 B；With error
Signal VC continues to increase, and in a switch periods, duration of the VC lower than VBuck is less than tminWhen, then VO1 is forced
High level.VCL2 presses switching shown in Fig. 4 B, i.e. error signal VC and VBuck acclivity hand over the decline for getting over moment generation VCL2
Edge, by fixed tminTime-switching is high level.VCL2 and VO1 obtains VAB signal by logical AND circuit.
Error signal VC and VBoost acclivity hands over the time interval for getting over moment and VBuck failing edge moment to be denoted as t3
(t), postpone t from VBuck failing edgeAD0-t3(t) failing edge of VCL1 is generated.Meanwhile VO2 is according to the electricity of progress height shown in Fig. 4 B
Flat turn is changed, i.e. VC is low level when being higher than VBoost, otherwise is high level.VCL1 and VO2 obtains VCD letter by logical AND circuit
Number.
When error signal VC is more than or equal to VHWhen, control signal CON is low level, closes impulse generator Pulse and pincers
Position circuit Clamp；Converter enters Boost operating mode, and transitional operation mode terminates.
Refering to what is shown in Fig. 5, it is designed clamp circuit that dotted box is interior in system architecture, to guarantee that system can be smooth
Pattern switching.
Basic principles and main features and advantages of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of control system of same phase buck-boost converter mode smooth switching, which is characterized in that converted in Buck-Boost
Control circuit in install additional a clamp element, the clamp element can by One Buck-Boost converter body with four tube assembly of phase
Power tube SC and SB minimum turn-on time clamp in tmin, under Buck mode and Boost mode most by power tube SA and SD
Big turn-on time is set as tAD0, wherein tminAnd tAD0For setting value, and defines power tube SA and power tube SC and simultaneously turn on, work
Making the time is tAC；Power tube SA and power tube SD are simultaneously turned on, working time tAD；Power tube SB and power tube SD are led simultaneously
The logical time is tBD；When system work in Buck mode, tAD+tBD=Ts, tAC=0；When system work in Boost mode,
tAD+tBD=Ts, tAC+tAD=Ts, tBD=0, tAD0=aTS；tmin=bTs。
2. a kind of control system of same phase buck-boost converter mode smooth switching according to claim 1, feature exist
In the clamp element includes sequentially connected clamp module and pulse generation module, and the clamp element input meets Buck-
The comparator component of Boost, output connect in One Buck-Boost converter body with the driver of four pipe of phase.
3. a kind of control system of same phase buck-boost converter mode smooth switching according to claim 1, feature exist
In the comparator component includes comparator Coml, comparator Com2 and comparator Com3；The output of sampling resistor samples
Voltage VSWith reference voltage VREF, input terminal as error amplifier Amp；The output signal of error amplifier is error signal
VC, comparator Com1 are by VBUCKAnd VBOOSTSawtooth wave exports compared with error signal VC, and by control signal VO1 and VO2 to pincers
Hyte part Clamp；Comparator Com2 and Com3 use signal V respectivelyHWith signal VLCompared with error signal VC, control signal is generated
CON, and export and give clamp element Clamp, wherein VHFor VBuckThe peak value of sawtooth wave, VLFor VBoostThe valley of sawtooth wave.
4. a kind of control system of same phase buck-boost converter mode smooth switching according to claim 1, feature exist
In including: power switch tube S A, power switch tube S C, synchronous rectification power tube SB and synchronous rectification power with four tube assembly of phase
The same phase four of pipe SD composition is managed, and is connect simultaneously with drive module；The one end inductance L simultaneously with power switch tube S A and synchronous rectification
Power tube SB connection, the other end are connect with power switch tube S C and synchronous rectification power tube SD simultaneously；Synchronous rectification power tube SD
Output is connected with load, and the adjusting output voltage with four tube assembly of phase is VOUT；The outer capacitor C1 of piece connects the defeated of same four tube assembly of phase
Enter and is grounded；The outer capacitor C2 of piece connects output and the ground connection of same four tube assembly of phase；The outer capacitor C3 of piece connects the output of error amplifier Amp
And it is grounded.
5. a kind of control system of same phase buck-boost converter mode smooth switching according to claim 1, feature exist
In tAD0=0.85TS；tmin=0.05Ts。
6. a kind of control method of same phase buck-boost converter mode smooth switching, which is characterized in that the Buck-Boost of transition
It is initially power tube SA and SD conducting, followed by power tube SA and SC are connected, and are finally in a switch periods in mode
Power tube SB and SD conducting；, and a switch periods can respectively by One Buck-Boost converter body with four tube assembly of phase
The minimum time that simultaneously turns on of power tube SA and SC clamp in tmin, minimum time that power tube SB and SD are simultaneously turned on clamp
In tmin, the power tube SA and SD maximum time simultaneously turned under Buck mode and Boost mode is set as tAD0, wherein
tminAnd tAD0For setting value, and defining power tube SA and power tube SC to simultaneously turn on the working time is tAC；Power tube SA and power
Pipe SD simultaneously turns on the working time as tAD；The time that power tube SB and power tube SD are simultaneously turned on is tBD；When system work exists
When Buck mode, tAD+tBD=Ts, tAC=0；When system work in Boost mode, tAD+tBD=Ts, tAC+tAD=Ts, tBD=
0, tAD0=aTS；tmin=bTs。
7. a kind of control method of same phase buck-boost converter mode smooth switching according to claim 6, feature exist
In power tube SA and power tube SC simultaneously turn on the working time as tAC；Power tube SA and power tube SD simultaneously turn on the working time
For tAD；The time that power tube SB and power tube SD are simultaneously turned on is tBD；When system work in Buck mode, tAD+tBD=Ts,
tAC=0, and have
Wherein, MVBuckIndicate that Buck mode will switch to the DC voltage conversion ratio at Buck-Boost mode moment, MvBB1Table
Show DC voltage conversion ratio when just switching to Buck-Boost mode, MVBB2When indicating that Boost mode will be switched to
DC voltage converts ratio, MVBoostIndicate DC voltage conversion ratio when just switching to Boost mode；tAD0For the power of setting
Pipe SA and SD maximum turn-on time under Buck mode and Boost mode；If mode smooth switches, formula (3) and formula (4) phase
Deng formula 5 and formula 6 are equal；It enables above-mentioned two formula difference equal, then can determine from Buck mode or Boost pattern switching to Buck-
This moment of Boost mode, the time interval that power tube SA and SD are simultaneously turned on are tAD1。
8. a kind of control method of same phase buck-boost converter mode smooth switching according to claim 7, feature exist
In, as input voltage reduces, the operating mode of converter from Buck mode to Buck-Boost mode again to Boost mode,
It specifically includes:
Step 1: error signal VCLower than VLWhen, system work controls voltage conversion ratio in Buck mode, power tube SA and SB,
In, VLIt is VBOOSTThe valley of sawtooth wave；
Step 2: error signal VCSlowly rise above VLWhen, minimum time t that lamp power pipe SA and SC while is connectedmin,
The time be connected while power tube SA and SD is from tAD0Moment drops to tAD1The time that power tube SB and SD are simultaneously turned on
VCSlowly rise and become smaller, the time that power tube SA and SD are simultaneously turned on is with VCSlowly rise and become larger, until tADFrom tAD1On
It is raised to tAD0；
Step 3: error signal VCContinue to rise, the time that power tube SA and SD are simultaneously turned at this time is always tAD0, power tube SA
The time simultaneously turned on SC no longer clamps, with VCRise and become larger, the time that power tube SB and SD are simultaneously turned on is with VCRise and
Become smaller, until tBDIt is reduced to tmin；
Step 4: error signal VCContinue to rise and lower than VHWhen, minimum time that lamp power pipe SB and SD while is connected
tmin；The time that power tube SA and SC are simultaneously turned on is with VCSlowly rise and becomes larger, the time that power tube SA and SD are simultaneously turned on
With VCSlowly rise and reduce, until tADFrom tAD0It is reduced to tAD1, while VCEqual to VH；Wherein, VHIt is VBUCKThe peak of sawtooth wave
Value；
Step 5: error signal VCContinue to rise and is higher than VHWhen, system works in Boost operating mode, no longer lamp power pipe
The minimum time be connected while SB and SD；The time be connected while power tube SA and SD is from tAD1Moment rises to tAD0, function
Rate pipe SC and SD control voltage conversion ratio.
9. a kind of control method of same phase buck-boost converter mode smooth switching according to claim 6, feature exist
In tAD0=0.85TS；tmin=0.05Ts。
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| CN110943619A (en) * | 2019-12-27 | 2020-03-31 | 深圳英集芯科技有限公司 | Sawtooth wave signal control circuit and sawtooth wave generator |
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