CN106253662B - Switch converters determine frequency V2C dynamic afterflow control methods and its control device - Google Patents
Switch converters determine frequency V2C dynamic afterflow control methods and its control device Download PDFInfo
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- CN106253662B CN106253662B CN201610723741.1A CN201610723741A CN106253662B CN 106253662 B CN106253662 B CN 106253662B CN 201610723741 A CN201610723741 A CN 201610723741A CN 106253662 B CN106253662 B CN 106253662B
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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
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to the control methods and its device of multiple-channel output switch converters, belong to power electronic equipment field, and specially switch converters determine frequency V2C dynamic afterflow control methods and its control device with reference to output voltage and inductive current information, control switch converters main switch, and inductive current information is used as slope compensation, compensate the smaller situation of output capacitance equivalent series resistance；Continued flow switch pipe into Mobile state afterflow is controlled by inductive current and load current, CCM PCCM is worked in when overloaded in BCM DCM at light load, making single-inductance double-output switching converter operation, realizes the separately adjustable of each output branch.Hybrid conductive pattern single-inductance double-output switch converters using the present invention have the advantages that stability is good, and the cross influence between output branch is small, and input, load transient response speed are fast, efficient.
Description
Technical field
The present invention relates to the control methods and its device of multiple-channel output switch converters, belong to power electronic equipment field,
Specially a kind of hybrid conductive pattern single-inductance double-output switch converters determine frequency V2C dynamic afterflow control methods and its control dress
It puts.
Background technology
In computer and electronic equipment, it usually needs the supply voltage of multiple grades is powered simultaneously, therefore, with portable
The extensive of formula equipment is popularized, and switch converters of the research with multiple-channel output ability are very necessary.Traditional multiple-channel output is opened
Pass converter magnetic element is more, and volume is big, and single inductance multi-output switching converter is small, at low cost with system bulk, can be real
The advantages of now separately adjustable to output branch, the products such as modern electronic equipment and mobile terminal to need multiple-output electric power carry
Ideal solution has been supplied, has been with a wide range of applications.
It is similar with single output switch converters, different circuit parameters is selected, single-inductance double-output switch converters can work
Make in continuous current mode conduction mode (continuous conduction mode, CCM), critical conduction mode
(boundary conduction mode, BCM), intermittent conductive pattern (discontinuous conduction mode,
) and pseudo- continuous conduction mode (pseudo-continuous conduction mode, PCCM) DCM.
Single-inductance double-output switch converters respectively have advantage and disadvantage in four kinds of operating modes, wherein, the mono- inductance of CCM-CCM is double
Exporting switch converters has the advantages of load capacity is strong, and output voltage ripple is small, but exist between different output branches and intersect shadow
It rings；DCM-DCM single-inductance double-outputs switch converters can avoid the cross influence between output branch, but under large-power occasions
With larger current ripples and EMI noise, small-power occasion is only applicable to, loading range is relatively narrow；The mono- inductance of PCCM-PCCM
Cross influence is substantially not present between the output branch of dual output switch converters, and can be by increasing afterflow reference value so as to carry
High converter load capacity, but due to the addition of continued flow switch pipe, reduce the efficiency of converter.Above-mentioned single-inductance double-output is opened
All output branches for closing converter work in same conduction mode, however, when output branch circuit load differs greatly, load
Compared with light output branch, there are the characteristics of ripple is big, efficiency is low；And single-inductance double-output switch converters respectively export branch
It it is required that may be different.Therefore, different output branches can select corresponding operating mode as needed, i.e., using hybrid conductive mould
Formula improves the overall performance of single-inductance double-output switch converters.
The control technology of switch converters greatly affects the performance of Switching Power Supply.Traditional voltage mode control has real
The advantages that now simple, strong antijamming capability, but influenced by error amplifier, input and load transient response are slower.In electric current
In type control, peak value comparison method has input transient response speed more faster than voltage mode control, it is easy to accomplish converter
Overcurrent protection, but average current cannot be accurately controlled, load transient response speed is not improved.Other types of electric current control
If Average Current Control and valley point current control, the control accuracy of electric current and input mapping has been respectively increased, but still in system
Load transient performance is not improved.V2(voltage-voltage,V2) control is a kind of electricity of " voltage-type "+" voltage-type " combination
Double -loop control is pressed, outer shroud is identical with peak value comparison method, and inner ring contains the information of output voltage ripple；The control method is to negative
Carrying variation has quick transient response speed, but when the equivalent series resistance of output capacitance is smaller, converter can not be steady
Fixed work.To improve its antijamming capability, V can be used2C (voltage-voltage-current, V2C it) controls, this controlling party
Method all has quick response speed to load sudden change and input mutation.On the other hand, PCCM is opened in the control of continued flow switch pipe
The characteristic for closing converter also has a significant impact.The afterflow control of traditional PCCM switch converters is controlled using constant reference current
(constant-reference-current, CRC) mode, transducer effciency of the control mode under the conditions of underloading are relatively low.
In order to improve the efficiency of converter, freewheel current value can be adjusted in different loads.
Invention content
For above-mentioned technical problem, the object of the present invention is to provide a kind of hybrid conductive pattern single-inductance double-output switches to become
The control method of parallel operation, is allowed to overcome the technical disadvantages of existing single-inductance double-output switch converters, while has good steady
Qualitative and mapping, smaller cross influence and higher transducer effciency, and the list of various topological structures can be suitable for
Inductance dual output switch converters.
The technical solution adopted by the present invention is：
Switch converters determine frequency V2C dynamic afterflow control methods are：Main switch uses output voltage combination inductive current
V2C is controlled, and continued flow switch pipe is controlled using dynamic afterflow；In each switch periods, inductive current is detected, obtains signal
IL, output voltage, the output current of two output branches are detected, obtains signal VoaAnd Vob、IoaAnd Iob；By VoaAnd voltage reference
Value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobWith voltage reference value Vref2The second error is sent to put
Big device EA2 generates signal Ve2；By IL、Voa、Vob、Ve1And Ve2And Vpa、VpbIt is sent into the first pulse signal producer PGR1 generations
Signal RR1；By IL、IoaAnd IobIt is sent into the second pulse signal producer PGS and generates signal IdcWith signal SS；By ILAnd IdcIt is sent into
Third pulse signal producer PGR2 generates signal RR2；By clock signal clk and signal VpbIt is obtained by first or door OR1
Signal and signal RR1 are sent into the first trigger RS1 and generate pulse signal Vp1, to control the conducting of converter main switch and pass
It is disconnected；Clock signal clk and signal RR2 generate pulse signal V by the second trigger RS2paAnd Vpb, to control converter branch
The turn-on and turn-off of way switch pipe；Signal SS and signal Vp1Pulse signal V is generated by third trigger RS3p2, to control
The turn-on and turn-off of continued flow switch pipe.
The control device of this method is that switch converters determine frequency V2C dynamic follow current control devices are detected including first voltage
Circuit VS1, second voltage detection circuit VS2, the first current detection circuit IS1, the second current detection circuit IS2, third electric current
Detection circuit IS3, the first error amplifier EA1, the second error amplifier EA2, the first pulse signal producer PGR1, the second arteries and veins
Rush signal generator PGS, third pulse signal producer PGR2, the first trigger RS1, the second trigger RS2, third trigger
RS3, first or door OR1, the first driving circuit DR1, the second driving circuit DR2, the driving electricity of third driving circuit DR3 and the 4th
Road DR4；The first voltage detection circuit VS1 is connected with the first error amplifier EA1, second voltage detection circuit VS2 with
Second error amplifier EA2 is connected；First voltage detection circuit VS1, second voltage detection circuit VS2, the first error amplifier
EA1, the second error amplifier EA2, the first current detection circuit IS1, the Q1 ends of the second trigger RS2 and Q ends are respectively with first
Pulse signal producer PGR1 is connected；The R ends phase of the output terminal of first pulse signal producer PGR1 and the first trigger RS1
Even；Clock signal clk, the Q1 ends connection first of the second trigger RS2 or the output terminal connection first of door OR1, first or door OR1
The S ends of trigger RS1；The first current detection circuit IS1, the second current detection circuit IS2, third current detection circuit
IS3 is connected respectively with the second pulse signal producer PGS；The SS output terminals connection third of second pulse signal producer PGS is touched
Send out the S ends of device RS3, the R ends of the Q ends connection third trigger RS3 of the first trigger RS1；First current detection circuit IS1,
The I of two pulse signal producer PGSdcOutput terminal, the second trigger RS2 Q ends respectively with third pulse signal producer PGR2
It is connected；Clock signal clk is connected with the S ends of the second trigger RS2, the output terminal and second of third pulse signal producer PGR2
The R ends of trigger RS2 are connected；The Q ends that the Q ends of first trigger RS1 connect the first driving circuit DR1, the second trigger RS2 connect
The Q ends for meeting the connection of Q1 ends the third driving circuit DR3, third trigger RS3 of the second driving circuit DR2, the second trigger RS2 connect
Meet the 4th driving circuit DR4.
The first pulse signal producer PGR1, including first adder ADD1, second adder ADD2, the first ratio
Compared with device CMP1, the second comparator CMP2, first and door AND1, second and door AND2 and second or door OR2；First voltage is examined
The output terminal of slowdown monitoring circuit VS1, the first current detection circuit IS1 output terminal connect respectively with first adder ADD1, by first
The output signal V of voltage detecting circuit VS1oa, the first current detection circuit IS1 output signal ILIs sent into after being multiplied by coefficient k 1
One adder ADD1；The output terminal of second voltage detection circuit VS2 is connect with second adder ADD2, and second voltage is detected electricity
The output signal V of road VS2ob, signal ILSecond adder ADD2 is sent into after being multiplied by coefficient k 2；First error amplifier EA1 and
The output terminal of one adder ADD1 connects the input terminal of first comparator CMP1 respectively, and the second error amplifier EA2 and second adds
The output terminal of musical instruments used in a Buddhist or Taoist mass ADD2 connects the input terminal of the second comparator CMP2 respectively；The output terminal of first comparator CMP1 and second touches
The Q ends of hair device RS2 connect the input terminal of first and door AND1, the second comparator CMP2 output terminals and the second trigger RS2 respectively
Q1 ends connect the input terminal of second and door AND2 respectively；First with door AND1, second and door AND2 respectively with second or door OR2
It is connected, the output signal of second or door OR2 is RR1.
The second pulse signal producer PGS, including third or door OR3, third comparator CMP3, the 4th comparator
CMP4, third adder ADD3, signal selector CH and third and door AND3；By the second current detection circuit IS2, third
Current detection circuit IS3 is connected respectively with third or door OR3；Third or door OR3, pattern switching current signal IrefRespectively with
Three comparator CMP3 are connected；The output terminal connection third adder ADD3 of third current detection circuit IS3, third current detecting electricity
The output signal I of road IS3obIt is multiplied by coefficient k 3, signal ILThird adder ADD3 is sent into after being multiplied by coefficient k 4；Third comparator
The output letter of the output terminal of CMP3, output terminal the connection signal selector CH, third comparator CMP3 of third adder ADD3
Number, the output signal of 0 signal, third adder ADD3 be sent into signal selector CH；Signal selector CH, the first current detecting electricity
Road IS1 is connected respectively with the 4th comparator CMP4；The Q1 ends of 4th comparator CMP4 and the second trigger RS2 respectively with third with
Door AND3 is connected, and the output terminal of signal selector CH is Idc, the output signal of third and door AND3 are SS.
The third pulse signal producer PGR2 is formed including multiplier MULT and the 5th comparator CMP5；By
One current detection circuit IS1, the second trigger RS2 input terminal of the Q ends respectively with multiplier MULT be connected；By described second
The output terminal of signal selector CH in pulse signal producer PGS, multiplier MULT output terminal respectively with the 5th comparator
CMP5 is connected, and the output signal of the 5th comparator CMP5 is RR2.
Compared with prior art, the beneficial effects of the invention are as follows：
First, the present invention provides a kind of effective control to work in the single-inductance double-output switch converters of hybrid conductive pattern
Method processed has good stability；When wherein one, which exports branch circuit load, changes, the voltage of another output branch
It is basically unchanged, there is the cross influence of very little.
2nd, it is controlled (being denoted as V-CRC controls) using CRC using voltage mode control, continued flow switch pipe with main switch
PCCM-PCCM single-inductance double-output switch converters are compared, and single-inductance double-output switch converters of the invention are in input voltage
When changing, the turn-on and turn-off of main switch and branch switch pipe can be quickly adjusted, output voltage overshoot is small, adjusts
Time is short, and input mapping is good.
3rd, compared with the PCCM-PCCM inductance dual output switch converters of V-CRC controls, single inductance lose-lose of the invention
Go out switch converters has quick transient response speed when loading and changing, and the overshoot of output voltage is small, the friendship between branch
Fork influences small.
4th, compared with the PCCM-PCCM inductance dual output switch converters of V-CRC controls, single inductance lose-lose of the invention
Go out switch converters under fully loaded transportation condition, by dynamic regulation freewheel current value, which works in CCM-PCCM moulds always
Formula, it is ensured that smaller cross influence；Under the conditions of underloading, single-inductance double-output switching converter operation of the invention in
BCM-DCM patterns, reduce switching loss, improve transducer effciency；Due to changeable pattern and it can realize dynamic afterflow, it should
Converter has higher efficiency in full-load range.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the circuit structure block diagram of one control method of the embodiment of the present invention.
Fig. 2 is the circuit structure block diagram of the first pulse signal producer PGR1 of the embodiment of the present invention one.
Fig. 3 is the circuit structure block diagram of the second pulse signal producer PGS of the embodiment of the present invention one.
Fig. 4 is the circuit structure block diagram of the third pulse signal producer PGR2 of the embodiment of the present invention one.
Fig. 5 is the circuit structure block diagram of the embodiment of the present invention one.
Primary waves when Fig. 6 is the mixed mode single-inductance double-output switch converters steady operation of the embodiment of the present invention one
Shape schematic diagram.
Fig. 7 is that the PCCM-PCCM converters that the converter TD and V-CRC of the embodiment of the present invention one are controlled are dashed forward in input voltage
Transient state time-domain-simulation waveform during change.
Fig. 8 is the PCCM-PCCM converters of converter TD and the V-CRC control of the embodiment of the present invention one in a branch circuit loads
Output voltage transient state time-domain-simulation oscillogram during mutation.
Fig. 9 is the PCCM-PCCM converters of converter TD and the V-CRC control of the embodiment of the present invention one in b branch circuit loads
Output voltage transient state time-domain-simulation oscillogram during mutation.
Figure 10 be the embodiment of the present invention one control converter TD circuit parameter change after, operating mode is switched to
BCM-DCM, converter stable state time-domain-simulation waveform.
Figure 11 (a) is that the PCCM-PCCM converters of converter TD and the V-CRC control of the present invention are respectively adopted in a outputs
Efficiency curve diagram when branch circuit load changes.
Figure 11 (b) is that the PCCM-PCCM converters of converter TD and the V-CRC control of the present invention are respectively adopted in b outputs
Efficiency curve diagram when branch circuit load changes.
Figure 12 be the embodiment of the present invention one control converter TD circuit parameter change after, branch circuit load be mutated when export
Voltage transient time-domain-simulation oscillogram.
Figure 13 is the circuit structure block diagram of the embodiment of the present invention two.
Specific embodiment
Further detailed description is done to the present invention below by specific example with reference.
Embodiment one
Fig. 1 shows that a kind of specific embodiment of the invention is：Hybrid conductive pattern single-inductance double-output switch converters
Determine frequency V2C dynamic follow current control devices, mainly by first voltage detection circuit VS1, second voltage detection circuit VS2, the first electricity
Current detection circuit IS1, the second current detection circuit IS2, third current detection circuit IS3, the first error amplifier EA1, second
Error amplifier EA2, the first pulse signal producer PGR1, the second pulse signal producer PGS, third pulse signal producer
PGR2, the first trigger RS1, the second trigger RS2, third trigger RS3, first or door OR1, the first driving circuit DR1,
Two driving circuit DR2, third driving circuit DR3 and the 4th driving circuit DR4 compositions；In each switch periods, inductance is detected
Electric current obtains signal IL, output voltage, the output current of two output branches are detected, obtains signal VoaAnd Vob、IoaAnd Iob；It will
VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobWith voltage reference value Vref2It is sent into
Signal V is generated to the second error amplifier EA2e2；By IL、Voa、Vob、Ve1And Ve2It is sent into the first pulse signal producer PGR1 lifes
Into signal RR1；By IL、IoaAnd IobIt is sent into the second pulse signal producer PGS and generates signal IdcAnd SS；By ILAnd IdcIt is sent into the
Three pulse signal producer PGR2 generate signal RR2；The signal and signal that clock signal clk is obtained by first or door OR1
RR1 is sent into the first trigger RS1 and generates pulse signal Vp1, to control the turn-on and turn-off of converter main switch；Clock is believed
Number CLK and signal RR2 generates pulse signal V by the second trigger RS2paAnd Vpb, to control converter branch switch pipe
Turn-on and turn-off；Signal SS and signal Vp1Pulse signal V is generated by third trigger RS3p2, to control continued flow switch pipe
Turn-on and turn-off.
Fig. 2 shows the first pulse generator PGR1's of this example specifically comprises：Added by first adder ADD1, second
Musical instruments used in a Buddhist or Taoist mass ADD2, first comparator CMP1, the second comparator CMP2, first and door AND1, second and door AND2 and second or door
OR2 is formed；By the output signal V of first voltage detection circuit VS1oa, the first current detection circuit IS1 output signal ILIt is multiplied by
First adder ADD1 is sent into after coefficient k 1；By the output signal V of second voltage detection circuit VS2ob, signal ILIt is multiplied by coefficient k 2
It is sent into second adder ADD2 afterwards；The positive ends of the output terminal connection first comparator CMP1 of first adder ADD1, first
The negative polarity end of the output terminal connection first comparator CMP1 of error amplifier EA1；The output terminal connection of second adder ADD2
The positive ends of second comparator CMP2, the output terminal of the second error amplifier EA2 connect the negative polarity of the second comparator CMP2
End；The switch controlled signal V of output terminal and a the output branch of first comparator CMP1paConnection first and door AND1；Second ratio
Compared with device CMP2 output terminals and the switch controlled signal V of b output branchespbConnection second and door AND2；First with door AND1 and the
Two connect second or door OR2 with the output terminal of door AND2.
Fig. 3 shows that the second pulse generator PGS's of this example specifically comprises：By third or door OR3, third comparator
CMP3, the 4th comparator CMP4, third adder ADD3, signal selector CH and third are formed with door AND3；By the second electricity
Current detection circuit IS2, third current detection circuit IS3 are connected with third or door OR3；The output termination third of third or door compares
The positive ends of device CMP3, pattern switching current signal IrefConnect the negative polarity end of third comparator CMP3；Third current detecting
The output signal I of circuit I S3obBe multiplied by coefficient k 3, the first current detection circuit IS1 output signal ILIt is sent into after being multiplied by coefficient k 4
Third adder ADD3；The output signal of third comparator CMP3,0 signal, third adder ADD3 output signal be sent into letter
Number selector CH, by the output signal selection single-inductance double-output switching converter operation of signal selector CH in CCM-PCCM
Or BCM-DCM；The output terminal of signal selector CH connects the positive ends of the 4th comparator CMP4, the first current detection circuit
The output terminal of IS1 connects the negative polarity end of the 4th comparator CMP4；4th comparator CMP4 output terminals and b export opening for branch
Close management and control signal VpbConnect third and door AND3.
Fig. 4 shows that the third pulse generator PGR2's of this example specifically comprises：By multiplier MULT and the 5th comparator
CMP5 is formed；The output terminal of first current detection circuit IS1, the switch controlled signal V of a output branchespaConnect multiplier
The input terminal of MULT；The output terminal of multiplier MULT connects the negative polarity end of the 5th comparator CMP5, second pulse letter
The I of signal selector CH output terminals in number generator PGSdcSignal connects the positive ends of the 5th comparator CMP5.
This example uses the device of Fig. 5, can easily and quickly realize above-mentioned control method.Fig. 5 shows, this example hybrid conductive
Pattern single-inductance double-output switch converters determine frequency V2C dynamic follow current control devices, by switch converters TD and switching tube S1、Sa、
Sb, continued flow switch pipe S2Control device composition.
Its working process and principle of the device of this example are：
Control device determines frequency V using hybrid conductive pattern single-inductance double-output switch converters2The work of C dynamics afterflow control
Making process and principle is：If Fig. 5, Fig. 6 are shown, when each switch periods start, clock signal clk output high level, i.e., second
The Q ends control wave V of trigger RS2paFor high level VpbFor low level, converter branch switch pipe SaConducting, a branch works
Make；Simultaneously as clock signal clk, VpbIt is connected with first or door OR1, the output terminal of first or door OR1 is high level, i.e., the
The S ends input high level of one trigger RS1, the Q ends control wave V of the first trigger RS1p1For high level, main switch
S1Conducting, due to the R ends of the Q ends connection third trigger RS3 of the first trigger RS1, continued flow switch pipe S2Shutdown, inductive current
ILRise, output voltage VoaRise；As output voltage VoaWith inductive current ILThe superposed signal for being multiplied by k1 rises to control signal
Ve1When, the R ends input signal RR1 of the first trigger RS1 is high level, the control wave V of the first trigger RS1 outputsp1
Become low level, S1It disconnects, inductive current ILDecline, output voltage VoaDecline；As inductive current ILWith VpaProduct, i.e. a branch
The signal of road input current drops to dynamic afterflow reference signal IdcWhen, the R ends input signal RR2 of the second trigger RS2 is height
Level, the control wave V of the second trigger RS2 outputspaBecome low level, VpbBecome high level, converter branch switch
Pipe SaShutdown, SbConducting, the work of b branches；Meanwhile the S that the output terminal of first or door OR1 is high level, i.e. the first trigger RS1
Hold input high level again, the control wave V of the first trigger RS1p1For high level, main switch S1Conducting, afterflow are opened
Close pipe S2It is still off, inductive current ILRise, output voltage VobRise；As output voltage VobWith inductive current ILIt is multiplied by k2's
Superposed signal rises to control signal Ve2When, the R ends input signal RR1 of the first trigger RS1 is high level, the first trigger
The control wave V of RS1 outputsp1Become low level, S1It disconnects, inductive current ILDecline, output voltage VobDecline；Work as inductance
Electric current ILDrop to dynamic afterflow reference signal IdcWhen, the S ends input signal SS of third trigger RS3 becomes high level, third
The control wave V of trigger RS3 outputsp2Become high level, continued flow switch pipe S2Conducting, until current switch period knot
Beam；Next clock signal clk arrives, into next switch periods.
First pulse signal producer PGR1 completes the generation and output of signal RR1：Fig. 2 shows output voltage VoaWith electricity
Inducing current ILThe superposed signal of coefficient k 1 is multiplied by higher than control signal Ve1When, the output signal of first comparator CMP1 is high electricity
It is flat, conversely, for low level；Output voltage VobWith inductive current ILThe superposed signal of coefficient k 2 is multiplied by higher than control signal Ve2When,
The output signal of second comparator CMP2 is high level, conversely, for low level；When the output signal and arteries and veins of first comparator CMP1
Rush signal VpaWhen simultaneously for high level, first is open-minded with door AND1, and second is blocked with door AND2, second or door OR2 output letters
Number RR1 is high level；Equally, as the output signal of the second comparator CMP2 and pulse signal VpbWhen simultaneously for high level, second
Open-minded with door AND2, first is blocked with door AND1, and second or door OR2 output signals RR1 is high level.
Second pulse signal producer PGS completes the generation and output of signal SS：Fig. 3 is shown, as a branch output currents Ioa
Or b branch output currents IobLess than pattern switching electric current IrefWhen, third comparator CMP3 output low levels, when a branches export electricity
Flow IoaWith b branch output currents IobAll it is higher than pattern switching electric current IrefWhen, third comparator CMP3 output high level；Work as third
When comparator CMP3 exports low level, signal selector CH selects 0 signal as dynamic afterflow reference signal Idc, converter at this time
Operating mode be BCM-DCM；When third comparator CMP3 exports high level, signal selector CH selection b roads output current
IobIt is multiplied by coefficient k 3 and inductive current ILThe superposed signal of coefficient k 4 is multiplied by as dynamic afterflow reference signal Idc, converter at this time
Operating mode be CCM-PCCM；When inductive current is less than to dynamic afterflow reference signal IdcWhen, the 4th comparator CMP4 outputs
High level, conversely, for low level；As the output signal of the 4th comparator CMP4 and pulse signal VpbWhen simultaneously for high level, the
Three is open-minded with door AND3.
Third pulse signal producer PGR2 completes the generation and output of signal RR2：Fig. 4 is shown, as inductive current ILWith
VpaProduct be less than dynamic afterflow reference signal IdcWhen, the output signal of the 5th comparator CMP5 is high level, otherwise is low electricity
It is flat.
The switch converters TD of this example is hybrid conductive pattern single-inductance double-output Buck converters.
Time-domain-simulation analysis is carried out to the method for this example with PSIM simulation softwares, it is as a result as follows.
Fig. 6 for one converter of the embodiment of the present invention in steady operation, inductor current signal IL, clock signal clk, pulse
Signal RR1, RR2, SS and drive signal Vpa、Vpb、Vp1、Vp2Between relation schematic diagram.It can be seen from the figure that using this hair
Bright single-inductance double-output switch converters can be operated in CCM-PCCM mixed modes.
The simulated conditions of Fig. 6 are：Input voltage Vin=20V, a branch voltage a reference value Vref1=7V, b branch voltage benchmark
Value Vref2=5V, inductance L=150 μ H (its equivalent series resistance is 50m Ω), capacitance Coa=Cob=470 μ F, capacitor equivalent string
Join resistance Rca=Rcb=100m Ω, load resistance Roa=7 Ω, Rob=5 Ω, main switch switching frequency be 10kHz, switching tube
S1、S2、 Sa、SbEquivalent parasitic resistance for 50m Ω, the conduction voltage drop of diode D1, D2 are 0.4V, inductive current ILCoefficient
K1, k2 are 0, pattern switching electric current IrefFor 0.4A.
Fig. 7 is the PCCM-PCCM single-inductance double-output Buck converters that converter TD using the present invention and V-CRC is controlled
(the input voltage V in input voltage mutationinChange from 20V → 40V), the transient state time-domain-simulation wave of two output branch output voltages
Shape.Simulated conditions are consistent with Fig. 6.As can be seen from the figure：The output electricity of a, b output branch of converter TD using the present invention
Press Voa、Vob, after input voltage mutation, stable state is just reentered almost without adjustment process；It can be seen that the change of the present invention
Parallel operation TD input mappings are good, and regulating time is short, output voltage transient changing amount very little, and anti-incoming wave kinetic force is strong.
Fig. 8, Fig. 9 are respectively the PCCM-PCCM single-inductance double-outputs of converter TD and V-CRC control using the present invention
Buck converters are in output branch a load sudden changes (the output current I of output branch aoaChange from 1A → 0.5A), output branch b
Load sudden change (the output current I of output branch bobFrom 0.5A → 1A change) when two output branch output voltages time-domain-simulation wave
Shape figure.The simulated conditions of Fig. 8, Fig. 9 are consistent with Fig. 6.As can be seen from the figure：Converter TD using the present invention is prominent in load
Output voltage transient changing amount after change is small, and regulating time is very short, and load transient performance is good, and an output branch circuit load is dashed forward
Become smaller to the cross influence of another output branch.
Such as two output branch output voltages of converter TD and the stable state time-domain-simulation of inductive current that Figure 10 is the present invention
Oscillogram.With Fig. 6 simulated conditions the difference lies in：Converter a roads load resistance Roa=18 Ω.Branch a load currents at this time
For Ioa=0.388A, less than pattern switching electric current Iref, converter works in BCM-DCM, can be reduced open when working in this pattern
Loss is closed, improves the light-load efficiency of converter.
Figure 11 (a) is the PCCM-PCCM single-inductance double-outputs Buck that converter TD using the present invention and V-CRC is controlled
Efficiency curve diagram of the converter in a output branch circuit load variations, Figure 11 (b) is converter TD and V-CRC using the present invention
Efficiency curve diagram of the PCCM-PCCM single-inductance double-output Buck converters of control in b output branch circuit load variations.By Figure 11
(a) it is found that when loading larger, converter TD of the invention works in CCM-PCCM, at this time the effect of two methods downconverter
Rate is close；With the reduction of load, as a branch circuit load electric currents IoaLess than pattern switching electric current IrefWhen, it is determined as light-load mode,
The converter operating mode of the present invention is switched to BCM-DCM, at this point, the efficiency of the converter TD of the present invention is controlled far above V-CRC
The efficiency of the PCCM-PCCM single-inductor dual-output converters of system.By Figure 11 (b) it is found that converter TD using the present invention is complete
All there is higher efficiency in loading range；When converter works in CCM-PCCM, as load reduces, on efficiency is gradual
It rises；After converter is switched to BCM-DCM, transducer effciency maintains high value, is basically unchanged.
As converter TD that Figure 12 is the present invention when exporting branch a load sudden changes two output branch output voltages when
Domain simulation waveform.With Fig. 6 simulated conditions the difference lies in：Inductive current ILWeighting coefficient k1, k2 be 0.08, output
Capacitance CoaAnd CobEquivalent series resistance be 20m Ω.It can be seen from the figure that after adding in inductive current compensation, when output electricity
When appearance equivalent series resistance is smaller, converter TD remains to steady operation, and its load is had substantially no effect on when penalty coefficient is smaller
Transient response speed, the cross influence very little between two output branches have good stability.
Embodiment two
As shown in figure 13, this example and embodiment one are essentially identical, are a difference in that：The converter TD of this example control is mixing
Conduction mode single-inductance double-output single-end ortho-exciting code converter.
The present invention is in addition to available for the single-inductance double-output switch converters in above example, it can also be used to hybrid conductive
A variety of multiple output circuits such as pattern single-inductance double-output half-bridge converter, hybrid conductive pattern single-inductance double-output full-bridge converter
In topology.
Claims (5)
1. switch converters determine frequency V2C dynamic afterflow control methods, it is characterised in that：Main switch combines electricity using output voltage
The V of inducing current2C is controlled, and continued flow switch pipe is controlled using dynamic afterflow；In each switch periods, inductive current is detected, is obtained
Signal IL, output voltage, the output current of two output branches are detected, obtains signal VoaAnd Vob、IoaAnd Iob；By VoaAnd voltage
A reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobWith voltage reference value Vref2It is sent to the second mistake
Poor amplifier EA2 generates signal Ve2；By IL、Voa、Vob、Ve1And Ve2And Vpa、VpbIt is sent into the first pulse signal producer PGR1
Generate signal RR1；By IL、IoaAnd IobIt is sent into the second pulse signal producer PGS and generates signal IdcWith signal SS；By ILAnd Idc
It is sent into third pulse signal producer PGR2 and generates signal RR2；By clock signal clk and signal VpbIt is obtained by first or door OR1
The signal and signal RR1 arrived is sent into the first trigger RS1 and generates pulse signal Vp1, to control the conducting of converter main switch
And shutdown；Clock signal clk and signal RR2 generate pulse signal V by the second trigger RS2paAnd Vpb, to control transformation
The turn-on and turn-off of device branch switch pipe；Signal SS and signal Vp1Pulse signal V is generated by third trigger RS3p2, to
Control the turn-on and turn-off of continued flow switch pipe.
2. switch converters according to claim 1 determine frequency V2The control device of C dynamic afterflow control methods, feature exist
In：Including first voltage detection circuit VS1, second voltage detection circuit VS2, the first current detection circuit IS1, the inspection of the second electric current
Slowdown monitoring circuit IS2, third current detection circuit IS3, the first error amplifier EA1, the second error amplifier EA2, the first pulse letter
Number generator PGR1, the second pulse signal producer PGS, third pulse signal producer PGR2, the first trigger RS1, second
Trigger RS2, third trigger RS3, first or door OR1, the first driving circuit DR1, the second driving circuit DR2, third driving
Circuit DR3 and the 4th driving circuit DR4；The first voltage detection circuit VS1 is connected with the first error amplifier EA1, the
Two voltage detecting circuit VS2 are connected with the second error amplifier EA2；First voltage detection circuit VS1, second voltage detection circuit
VS2, the first error amplifier EA1, the second error amplifier EA2, the first current detection circuit IS1, the second trigger RS2 Q1
End and Q ends are connected respectively with the first pulse signal producer PGR1；The output terminal and first of first pulse signal producer PGR1
The R ends of trigger RS1 are connected；Clock signal clk, the Q1 ends connection first of the second trigger RS2 or door OR1, first or door OR1
Output terminal connect the first trigger RS1 S ends；The first current detection circuit IS1, the second current detection circuit IS2,
Third current detection circuit IS3 is connected respectively with the second pulse signal producer PGS；The SS of second pulse signal producer PGS
The S ends of output terminal connection third trigger RS3, the R ends of the Q ends connection third trigger RS3 of the first trigger RS1；First electricity
The I of current detection circuit IS1, the second pulse signal producer PGSdcOutput terminal, the second trigger RS2 Q ends respectively with third arteries and veins
Signal generator PGR2 is rushed to be connected；Clock signal clk is connected with the S ends of the second trigger RS2, third pulse signal producer
The output terminal of PGR2 is connected with the R ends of the second trigger RS2；The Q ends of first trigger RS1 connect the first driving circuit DR1, the
The Q ends of two trigger RS2 connect the Q1 ends connection third driving circuit DR3 of the second driving circuit DR2, the second trigger RS2, the
The Q ends of three trigger RS3 connect the 4th driving circuit DR4.
3. switch converters according to claim 2 determine frequency V2The control device of C dynamic afterflow control methods, feature exist
In：The first pulse signal producer PGR1, including first adder ADD1, second adder ADD2, first comparator
CMP1, the second comparator CMP2, first and door AND1, second and door AND2 and second or door OR2；First voltage detection electricity
The output terminal of road VS1, the first current detection circuit IS1 output terminal connect respectively with first adder ADD1, by first voltage
The output signal V of detection circuit VS1oa, the first current detection circuit IS1 output signal ILFeeding first adds after being multiplied by coefficient k 1
Musical instruments used in a Buddhist or Taoist mass ADD1；The output terminal of second voltage detection circuit VS2 is connect with second adder ADD2, by second voltage detection circuit
The output signal V of VS2ob, signal ILSecond adder ADD2 is sent into after being multiplied by coefficient k 2；First error amplifier EA1 and first
The output terminal of adder ADD1 connects the input terminal of first comparator CMP1, the second error amplifier EA2 and the second addition respectively
The output terminal of device ADD2 connects the input terminal of the second comparator CMP2 respectively；The output terminal of first comparator CMP1 and the second triggering
The Q ends of device RS2 connect the input terminal of first and door AND1 respectively, the second comparator CMP2 output terminals and the second trigger RS2's
Q1 ends connect the input terminal of second and door AND2 respectively；First with door AND1, second and door AND2 respectively with second or door OR2 phases
Even, the output signal of second or door OR2 is RR1.
4. switch converters according to claim 2 determine frequency V2The control device of C dynamic afterflow control methods, feature exist
In：The second pulse signal producer PGS, including third or door OR3, third comparator CMP3, the 4th comparator CMP4,
Third adder ADD3, signal selector CH and third and door AND3；Second current detection circuit IS2, third electric current are examined
Slowdown monitoring circuit IS3 is connected respectively with third or door OR3；Third or door OR3, pattern switching current signal IrefRespectively compared with third
Device CMP3 is connected；Output terminal connection the third adder ADD3, third current detection circuit IS3 of third current detection circuit IS3
Output signal IobIt is multiplied by coefficient k 3, signal ILThird adder ADD3 is sent into after being multiplied by coefficient k 4；Third comparator CMP3's
Output terminal, the output signal of output terminal connection signal selector CH, third comparator CMP3 of third adder ADD3,0 signal,
The output signal of third adder ADD3 is sent into signal selector CH；Signal selector CH, the first current detection circuit IS1 distinguish
It is connected with the 4th comparator CMP4；The Q1 ends of 4th comparator CMP4 and the second trigger RS2 respectively with third and door AND3 phases
Even, the output terminal of signal selector CH is Idc, the output signal of third and door AND3 are SS.
5. switch converters according to claim 2 determine frequency V2The control device of C dynamic afterflow control methods, feature exist
In：The third pulse signal producer PGR2 is formed including multiplier MULT and the 5th comparator CMP5；By the first electric current
Detection circuit IS1, the second trigger RS2 input terminal of the Q ends respectively with multiplier MULT be connected；Second pulse is believed
The output terminal of signal selector CH, the output terminal of multiplier MULT are connected respectively with the 5th comparator CMP5 in number generator PGS,
The output signal of 5th comparator CMP5 is RR2.
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| CN107979266B (en) * | 2017-11-28 | 2019-11-29 | 西南民族大学 | Single-inductance double-output switch converters voltage-type-capacitance current ripple mixing control method and device |
| CN110460237B (en) * | 2019-09-11 | 2021-01-29 | 西南交通大学 | Control method and device for PCCM Boost converter |
| CN112398342B (en) * | 2021-01-21 | 2021-04-06 | 四川大学 | Frequency conversion control device and method for combined single-inductor dual-output switch converter |
| CN113009313B (en) * | 2021-01-29 | 2022-05-27 | 南京英锐创电子科技有限公司 | Sensor diagnostic device and sensor detection circuit |
| CN113595391B (en) * | 2021-08-09 | 2022-09-09 | 四川大学 | Self-adaptive slope compensation device and method for single-inductor dual-output switching converter |
| CN117118222A (en) * | 2023-04-28 | 2023-11-24 | 荣耀终端有限公司 | Step-down voltage conversion circuit and electronic device |
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