CN106208684A - The pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters and device thereof - Google Patents
The pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters and device thereof Download PDFInfo
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- CN106208684A CN106208684A CN201610723239.0A CN201610723239A CN106208684A CN 106208684 A CN106208684 A CN 106208684A CN 201610723239 A CN201610723239 A CN 201610723239A CN 106208684 A CN106208684 A CN 106208684A
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
Abstract
The invention discloses a kind of pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters and device thereof, in conjunction with output voltage and capacitance current information, switch converters main switch is combined type control, by capacitance current and load current, continued flow switch pipe carried out dynamic afterflow control, it is achieved the independent regulation of each output branch road.The pseudo-continuous conduction mode single-inductance double-output switch converters using the present invention has a good stability, and the cross influence between output branch road is little, and input, load transient response speed are fast, efficiency advantages of higher.
Description
Technical field
The present invention relates to control method and the device thereof of multiple-channel output switch converters, belong to power electronic equipment field,
It is specially a kind of pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters and device thereof.
Background technology
Disparate modules in smart mobile phone, digital product typically requires different supply voltages, therefore, sets along with portable
Standby is extensive universal, and the switch converters that research has multiple-channel output ability is the most necessary.Single inductance multi-output switching conversion
Utensil has that system bulk is little, low cost, and can realize the advantage to output branch road independent regulation, can be widely applied to flat board electricity
Brain, portable information device, the field such as LED driving.
Similar with single output switch changer, select different circuit parameters, single-inductance double-output switch converters can work
Make in continuous current mode conduction mode (continuous conduction mode, CCM), intermittent conductive pattern
(discontinuous conduction mode, DCM) and pseudo-continuous conduction mode (pseudo-continuous
conduction mode,PCCM).When single-inductance double-output switching converter operation is in CCM, have that load capacity is strong, inductance
The advantage that current ripples is little, but owing to two output branch roads share an inductance, by inductance, each output branch road is coupling in one
Rise, between output branch road, there is cross influence；When working in DCM, owing to each output branch road exists the stage that inductive current is zero, real
Show power decoupled, it is to avoid cross influence, but there is under large-power occasions bigger current ripples and EMI noise, the suitableeest
For small-power occasion；When working in PCCM, the advantage having taken into account CCM and DCM switch converters, both can effectively suppress intersection shadow
Ring, it may have stronger load capacity.
The control technology of switch converters has strong influence to the performance of Switching Power Supply.Traditional voltage mode control tool
Having the advantages such as realization is simple, capacity of resisting disturbance is strong, but affected by error amplifier, input and load transient response are slower.?
In current-mode control, peak value comparison method has input transient response speed more faster than voltage mode control, it is easy to accomplish conversion
The overcurrent protection of device, but can not accurately control average current, load transient response speed is not improved.Other type of electricity
Flow control, as Average Current Control and valley point current control, has been respectively increased control accuracy and the input mapping of electric current, but
The most do not improve load transient performance.V2Control is the voltage double-loop control that a kind of " voltage-type "+" voltage-type " combines, outside it
Ring is identical with peak value comparison method, and internal ring contains the information of output voltage ripple；When load changes, due to inductive current
Can not suddenly change, first the change of load current embodies at output capacitance branch road, causes on output capacitance equivalent series resistance
The change of ripple voltage, therefore, this control method has quick transient response speed to load change.But work as output capacitance
Equivalent series resistance less time, output voltage ripple is nonlinear, and changer cannot steady operation.On the other hand, afterflow
The characteristic of PCCM switch converters is also had a significant impact by the control of switching tube.The afterflow of tradition PCCM switch converters controls to adopt
By constant reference current control (Constant-Reference-Current, CRC) mode, this control mode is under the conditions of underloading
Transducer effciency relatively low.In order to improve the efficiency of changer, freewheel current value can be adjusted in the case of different loads.
Summary of the invention
It is an object of the invention to provide control method and the device thereof of a kind of single-inductance double-output switch converters, be allowed to gram
Take the technical disadvantages of existing PCCM single-inductance double-output switch converters, there is good stability and mapping, relatively simultaneously
Little cross influence and higher transducer effciency, and the single-inductance double-output switch change-over of various topological structures can be applicable to
Device.
The technical solution used in the present invention is as follows:
The pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters, main switch is adopted
Combine the combined control of capacitance current with output voltage, continued flow switch pipe uses dynamic afterflow to control；Its detailed description of the invention
For: in each switch periods, the output voltage of two output branch roads of detection, output electric current, capacitance current, obtain signal VoaWith
Vob、IoaAnd Iob、IcaAnd Icb；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and produces signal Ve1, by Vob
With voltage reference value Vref2It is sent to the second error amplifier EA2 and produces signal Ve2；By Ve1、Ve2、IcaAnd IcbSend into the first pulse
Signal generator PGR generates signal RR, clock signal clk and signal RR and produces pulse signal V through the first trigger RS1p1, use
To control the turn-on and turn-off of changer main switch；Clock signal clk produces pulse signal V through the 3rd trigger DpaWith
Vpb, in order to control the turn-on and turn-off of changer branch switch pipe；By Ica、Icb、IoaAnd IobIt is sent to the second pulse signal produce
Raw device PGS generates signal SS；The Q end signal of signal SS and the first trigger RS1 produces pulse signal through the second trigger RS2
Vp2, in order to control the turn-on and turn-off of continued flow switch pipe.
A kind of pseudo-combined dynamic follow current control device of continuous conduction mode single-inductance double-output switch converters, including the
One voltage detecting circuit VS1, the second voltage detecting circuit VS2, the first current detection circuit IS1, the second current detection circuit
IS2, the 3rd current detection circuit IS3, the 4th current detection circuit IS4, the first error amplifier EA1, the second error amplifier
EA2, the first pulse signal producer PGR, the second pulse signal producer PGS, the first trigger RS1, the second trigger RS2,
3rd trigger D, the first drive circuit DR1, the second drive circuit DR2, the 3rd drive circuit DR3 and the 4th drive circuit DR4；
The first described voltage detecting circuit VS1 and the first error amplifier EA1 is connected, and the second voltage detecting circuit VS2 and second is by mistake
Difference amplifier EA2 is connected；First voltage detecting circuit VS1, the second voltage detecting circuit VS2, the first error amplifier EA1,
Two error amplifier EA2, the Q1 end of the 3rd trigger D and Q end, the first current detection circuit IS1, the second current detection circuit
IS2 is all connected with the first pulse signal producer PGR；The R end phase of the first pulse signal producer PGR and the first trigger RS1
Even；Described the first current detection circuit IS1, the second current detection circuit IS2, the 3rd current detection circuit IS3, the 4th electric current
Testing circuit IS4, the Q1 end of the 3rd trigger D is all connected with the second pulse signal producer PGS with Q end；Second pulse signal
The S end of generator PGS and the second trigger RS2 is connected, and clock signal clk is tactile with the S end of the first trigger RS1 and the 3rd respectively
The C end sending out device D is connected, and meanwhile, the Q1 end of the 3rd trigger D is linked into D end；The Q end of the first trigger RS1 connects the first driving
Circuit DR1, the Q end of the 3rd trigger D connects the Q1 end of the second drive circuit DR2, the 3rd trigger D and connects the 3rd drive circuit
The Q end of DR3, the second trigger RS2 connects the 4th drive circuit DR4.
Further, the first described pulse signal producer PGR includes first adder ADD1, second adder
ADD2, the first comparator CMP1, the second comparator CMP2, first and door AND1, second and door AND2, and first or door OR1；
The outfan of the first voltage detecting circuit VS1 is connected to the input of first adder ADD1, the first current detection circuit IS1's
Outfan is by being connected to another input of first adder ADD1 after multiplier that coefficient is k1；Second voltage detecting circuit
The outfan of VS2 is connected to the input of second adder ADD2, and the outfan of the second current detection circuit IS2 by coefficient is
The multiplier of k2 is connected to another input of second adder ADD2；The outfan of the first error amplifier EA1 and first adds
The outfan of musical instruments used in a Buddhist or Taoist mass ADD1 is connected respectively to the input of the first comparator CMP1, the outfan of the second error amplifier EA2 and
The outfan of second adder ADD2 is connected respectively to the input of the second comparator CMP2；The outfan of the first comparator CMP1
With the input that the Q output of the 3rd trigger D is connected respectively to first and door AND1, the second comparator CMP2 outfan and
The Q1 outfan of three trigger D is connected respectively to the input of second and door AND2；The outfan and second of first and door AND1
It is connected respectively to first or the input of door OR1 with the outfan of door AND2.
Further, the second described pulse signal producer PGS includes the 3rd comparator CMP3, the 4th comparator
CMP4, the 3rd and door AND3, the 4th and door AND4, and second or door OR2；The outfan of the first current detection circuit IS1 and
The outfan of the 3rd current detection circuit IS3 is connected respectively to the input of the 3rd comparator CMP3, the second current detection circuit
The outfan of IS2 and the outfan of the 4th current detection circuit IS4 are connected respectively to the input of the 4th comparator CMP4；3rd
The outfan of comparator CMP3 and the Q output of the 3rd trigger D are connected respectively to the input of the 3rd and door AND3, the 4th ratio
The outfan of relatively device CMP4 and the Q1 outfan of the 3rd trigger D are connected respectively to the input of the 4th and door AND4；3rd with
The door outfan of AND3 and the 4th is connected respectively to second or the input of door OR2 with the outfan of door AND4.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention provides a kind of effective control method for PCCM single-inductance double-output switch converters, has very well
Stability；When wherein an output branch circuit load changes, the voltage of another output branch road is basically unchanged, and has very
Little cross influence.
Two and main switch use voltage mode control, continued flow switch pipe use CRC control control method (be designated as V-CRC
Control) to compare, the PCCM single-inductance double-output switch converters of the present invention is when input voltage changes, it is possible to quickly regulate
Main switch and the turn-on and turn-off of branch switch pipe, output voltage overshoot is little, and regulating time is short, and input mapping is good.
Three, compared with controlling with V-CRC, the PCCM single-inductance double-output switch converters of the present invention has when load change
Quickly transient response speed, the overshoot of output voltage is little, and the cross influence between branch road is little.
Four, compared with controlling with V-CRC, the PCCM single-inductance double-output switch converters of the present invention is under fully loaded transportation condition, logical
Cross and dynamically improve freewheel current value, make changer work in PCCM all the time, it is ensured that the least cross influence；Under the conditions of underloading, logical
Cross and dynamically reduce freewheel current value, it is to avoid freewheeling period is long, thus improves light-load efficiency.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of the embodiment of the present invention one control method.
Fig. 2 is the circuit structure block diagram of the first pulse signal producer PGR 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 embodiment of the present invention one.
Fig. 5 is that the main waveform during PCCM single-inductance double-output switch converters steady operation of the embodiment of the present invention one shows
It is intended to.
Fig. 6 is that the changer TD of the embodiment of the present invention one and V-CRC control transient state time domain when input voltage mutation is imitated
True waveform.
Fig. 7 is changer TD output voltage transient state when a branch circuit load suddenlys change that the embodiment of the present invention one and V-CRC controls
Time-domain-simulation oscillogram.
Fig. 8 is changer TD output voltage transient state when b branch circuit load suddenlys change that the embodiment of the present invention one and V-CRC controls
Time-domain-simulation oscillogram.
Fig. 9 is that the changer TD being respectively adopted the present invention and V-CRC control is with efficiency curve diagram during load change.
Figure 10 be the embodiment of the present invention one control changer TD circuit parameter change after, branch circuit load sudden change time output
Voltage transient time-domain-simulation oscillogram.
Figure 11 is the circuit structure block diagram of the embodiment of the present invention two.
Detailed description of the invention
Below by concrete example with reference, the present invention is done further detailed description.
Embodiment one
Fig. 1 illustrates, a kind of detailed description of the invention of the present invention is: PCCM single-inductance double-output switch converters is combined dynamic
State follow current control device, mainly by the first voltage detecting circuit VS1, the second voltage detecting circuit VS2, the first current detection circuit
IS1, the second current detection circuit IS2, the 3rd current detection circuit IS3, the 4th current detection circuit IS4, the first error is amplified
Device EA1, the second error amplifier EA2, the first pulse signal producer PGR, the second pulse signal producer PGS, first triggers
Device RS1, the first trigger RS2, the 3rd trigger D, the first drive circuit DR1, the second drive circuit DR2, the 3rd drive circuit
DR3 and the 4th drive circuit DR4 composition；In each switch periods, the output voltage of two output branch roads of detection, output electric current
And capacitance current, obtain signal VoaAnd Vob、IoaAnd Iob、IcaAnd Icb；By VoaWith default voltage reference value Vref1It is sent to
One error amplifier EA1 produces error amplification signal Ve1, by VobWith default voltage reference value Vref2It is sent to the second error put
Big device EA2 produces error amplification signal Ve2；By Ve1、Ve2、IcaAnd IcbSend into the first pulse signal producer PGR and generate signal
RR, clock signal clk and signal RR produce pulse signal V through the first trigger RS1p1, in order to control changer main switch
Turn-on and turn-off；Clock signal clk produces pulse signal V through the 3rd trigger DpaAnd Vpb, in order to control changer branch road
The turn-on and turn-off of switching tube；By Ica、Icb、IoaAnd IobIt is sent to the second pulse signal producer PGS and generates signal SS；Signal
The Q end signal of SS and the first trigger RS1 produces pulse signal V through the second trigger RS2p2, in order to control continued flow switch pipe
Switch off and on.
Wherein, the function of the first pulse generator PGR is: by relatively each branch road output voltage, the combination of capacitance current
Signal and error amplification signal, thus produce reset signal RR of the first trigger RS1；The function of the second pulse generator PGS
For: by relatively each branch road output electric current and the signal of capacitance current, thus produce the set signal SS of the second trigger RS2；
First trigger RS1 and the second trigger RS2 all uses rest-set flip-flop structure, the 3rd trigger RS3 to use d type flip flop structure.
Fig. 2 illustrates, the first pulse generator PGR of this example specifically comprises: by first adder ADD1, the second addition
Device ADD2, the first comparator CMP1, the second comparator CMP2, first with door AND1, second and door AND2, and first or door
OR1 forms；Output signal V by the first voltage detecting circuit VS1oa, output signal I of the first current detection circuit IS1caTake advantage of
To send into the input of first adder ADD1 after coefficient k 1, the output termination first comparator CMP1's of first adder ADD1
Positive ends；Output signal V by the second voltage detecting circuit VS2ob, output signal I of the second current detection circuit IS2cbTake advantage of
To send into the input of second adder ADD2 after coefficient k 2, the output termination second comparator CMP2's of second adder ADD2
Positive ends；First error amplifier EA1, output signal V of the second error amplifier EA2e1、Ve2Connect the first comparator respectively
CMP1 and the negative polarity end of the second comparator CMP2；The outfan of the first comparator CMP1 and the switch controlled of a output branch road
Signal VpaConnect the input of first and door AND1, the switch controlled letter of the outfan of the second comparator CMP2 and output branch road b
Number VpbConnect the input of second and door AND2；First terminates first or door OR1 with exporting of door AND1 and second and door AND2
Input.Wherein, k1, k2 are amplification coefficient.
Fig. 3 illustrates, the second pulse generator PGS of this example specifically comprises: by the 3rd comparator CMP3, the 4th compare
Device CMP4, the 3rd and door AND3, the 4th and door AND4, and the second or door OR2 composition；By the first current detection circuit IS1's
Outfan is connected to the negative polarity end of the 3rd comparator CMP3, and the outfan of the 3rd current detection circuit IS3 accesses the 3rd and compares
The positive ends of device CMP3；The outfan of the second current detection circuit IS2 is connected to the negative polarity end of the 4th comparator CMP4, the
The outfan of four current detection circuit IS4 is connected to the positive ends of the 4th comparator CMP4；The output of the 3rd comparator CMP3
The Q output of end and the 3rd trigger D connects the input of the 3rd and door AND3, and the 4th comparator CMP4 outfan and the 3rd touches
The Q1 outfan sending out device D connects the input of the 4th and door AND4；The outfan of the the 3rd and door AND3 and the 4th and door AND4 is even
Connect second or the input of door OR2.
This example uses the device of Fig. 4, can realize above-mentioned control method easily and quickly.Fig. 4 illustrates, the mono-electricity of this example PCCM
The sense combined dynamic follow current control device of dual output switch converters, by switch converters TD and switching tube S1、Sa、Sb, afterflow opens
Close pipe S2Control device composition.
Its work process of the device of this example and principle be:
Control device use the combined dynamic afterflow of PCCM single-inductance double-output switch converters control work process and
Principle is: as Fig. 4, Fig. 5 illustrate, when each switch periods starts, and clock signal clk output high level, the i.e. the 3rd trigger D's
C end input high level, the Q end control wave V of the 3rd trigger DpaFor high level, changer branch switch pipe SaConducting, a
Branch road works, according to the operation principle of the 3rd trigger D: VpaBefore the next high level of signal CLK arrives, keep constant,
Owing to the Q1 outfan of the 3rd trigger D is connected with D end, control wave VpaAnd VpbHalf it is respectively turned within a cycle
The individual cycle, and low and high level is the most contrary.Meanwhile, the S end input high level of the first trigger RS1, the Q of the first trigger RS1
End control wave Vp1For high level, main switch S1Conducting, the Q end of the first trigger RS1 connects the R end of RS2, and afterflow is opened
Close pipe S2Turn off, capacitance current IcaRise, output voltage VoaRise；As output voltage VoaWith capacitance current IcaSuperposed signal
Rise to control signal Ve1Time, R end input signal RR of the first trigger RS1 is high level, the control of the first trigger RS1 output
Pulse signal V processedp1Become low level, S1Disconnect, capacitance current IcaDecline, output voltage VoaReduce；As capacitance current IcaDecline
To output electric current IoaTime, S end input signal SS of the second trigger RS2 is high level, the control arteries and veins of the second trigger RS2 output
Rush signal Vp2Become high level, continued flow switch pipe S2Conducting；After a branch road conducting half period, clock signal clk exports height again
Level, owing to the Q1 outfan of the 3rd trigger D is connected with D end, the Q1 end control wave V of the 3rd trigger DpbFor high electricity
Flat, branch switch pipe SbConducting, b branch road works, switching tube S1And continued flow switch pipe S2Control wave Vp1And Vp2Product
When generation method works to branch road a, production method is similar.
First pulse signal producer PGR completes generation and the output of signal RR: Fig. 2 illustrates, output voltage VoaWith electric capacity
Electric current IcaSuperposed signal higher than control signal Ve1Time, the output signal of the first comparator CMP1 is high level, otherwise, for low
Level；Output voltage VobWith capacitance current IcbSuperposed signal higher than control signal Ve2Time, the output letter of the second comparator CMP2
Number it is high level, otherwise, for low level；Output signal and pulse signal V as the first comparator CMP1paIt it is high level simultaneously
Time, first is open-minded with door AND1, and second is blocked with door AND2, first or door OR1 output signal RR be high level；Equally, when
The output signal of the second comparator CMP2 and pulse signal VpbWhen being high level, second is open-minded with door AND2, first and door simultaneously
AND1 is blocked, first or door OR1 output signal RR be high level.
Second pulse signal producer PGS completes generation and the output of signal SS: Fig. 3 illustrates, capacitance current IcaSignal is low
In output electric current IoaTime, the output signal of the 3rd comparator CMP3 is high level, otherwise, for low level；Capacitance current IcbSignal
Less than output electric current IobTime, the output signal of the 4th comparator CMP4 is high level, otherwise, for low level；When the 3rd comparator
The output signal of CMP3 and pulse signal VpaWhen being high level, the 3rd is open-minded with door AND3 simultaneously, and the 4th is blocked with door AND4,
Second or door OR2 output signal SS be high level；Equally, as output signal and the pulse signal V of the 4th comparator CMP4pbSimultaneously
During for high level, the 4th is open-minded with door AND4, and the 3rd is blocked with door AND3, second or door OR2 output signal SS be high level.
The switch converters TD of this example is PCCM single-inductance double-output Buck changer.
With PSIM simulation software, the method for this example being carried out time-domain-simulation analysis, result is as follows.
Fig. 5 be the embodiment of the present invention one changer when steady operation, clock signal clk, inductor current signal IL, pulse
Signal RR, pulse signal SS and driving signal Vpa、Vpb、Vp1、Vp2Between relation schematic diagram.It can be seen that use this
The single-inductance double-output switch converters of invention can be operated in PCCM.
The simulated conditions of Fig. 5 is: input voltage Vin=20V, a branch voltage reference value Vref1=7V, b branch voltage benchmark
Value Vref2=5V, inductance L=150 μ H (its equivalent series resistance is 50m Ω), electric capacity Coa=Cob=470 μ F, capacitor equivalent is connected
Resistance Rca=Rcb=100m Ω, load resistance Roa=7 Ω, Rob=5 Ω, branch switch pipe switching frequency is 20kHz, switching tube
S1、S2、Sa、SbEquivalent parasitic resistance be 50m Ω, the conduction voltage drop of diode D1, D2 is 0.4V, capacitance current IcaAnd Icb's
Coefficient k 1, k2 are 0.
Fig. 6 is that the PCCM single-inductance double-output Buck changer using the present invention and V-CRC to control is at input voltage mutation
Time (input voltage VinChange from 20V → 40V), the transient state time-domain-simulation waveform of two output branch road output voltages.Simulated conditions with
Fig. 5 is consistent.As can be seen from the figure: use the output voltage V of switch converters a, b output branch road of the present inventionoa、Vob, defeated
After entering voltage jump, just reenter stable state almost without adjustment process；As can be seen here, the PCCM single-inductance double-output of the present invention
Buck changer input mapping is good, and regulating time is short, and output voltage transient changing amount is the least, and anti-incoming wave kinetic force is strong.
Fig. 7, Fig. 8 are respectively the PCCM single-inductance double-output Buck changer using the present invention and V-CRC to control in output
Branch road a load changing (the output electric current I of output branch road aoaFrom 1A → 0.5A change), output branch road b load changing (output branch road
The output electric current I of bobChange from 0.5A → 1A) time the two time-domain-simulation oscillograms exporting branch road output voltage.Fig. 7, Fig. 8's is imitative
True condition is consistent with Fig. 5.As can be seen from the figure: use the PCCM single-inductance double-output Buck switch converters of the present invention, negative
Carrying the output voltage transient changing amount after sudden change little, regulating time is the shortest, and load transient performance is good, and an output branch road is born
Carry sudden change the least to the cross influence of another output branch road.
Fig. 9 is the efficiency curve diagram of the PCCM single-inductance double-output Buck changer using the present invention and V-CRC to control.By
Fig. 9 understands, and when bearing power is bigger, two kinds of method downconverters all have higher efficiency；Along with the reduction of bearing power,
The efficiency using the PCCM single-inductor dual-output converter of V-CRC control declines to a great extent rapidly；And use the PCCM of the present invention mono-
Inductance dual-output converter efficiency when bearing power reduces maintains high value always, and increases.
Such as PCCM single-inductance double-output Buck changer two outputs when exporting branch road a load changing that Figure 10 is the present invention
The time-domain-simulation oscillogram of branch road output voltage.It is with Fig. 5 simulated conditions difference: capacitance current IcaAnd IcbWeighting
Coefficient k 1, k2 are 0.2, output capacitance CoaAnd CobEquivalent series resistance be 5m Ω.It can be seen that add electricity
After capacitance current, when output capacitance equivalent series resistance is the least, PCCM single-inductance double-output Buck changer remains to steady operation,
And having substantially no effect on its load transient response speed, the cross influence between two output branch roads is the least, has good stability.
Embodiment two
As shown in figure 11, this example is essentially identical with embodiment one, is a difference in that: the changer TD that this example controls is PCCM
Single-inductance double-output single-end ortho-exciting code converter.
The present invention in addition to the single-inductance double-output switch converters that can be used in above example it can also be used to PCCM mono-electricity
In the sense multiple multiple output circuit topology such as dual output half-bridge converter, PCCM single-inductance double-output full-bridge converter.
Claims (4)
1. the pseudo-combined dynamic afterflow control method of continuous conduction mode single-inductance double-output switch converters, it is characterised in that:
Main switch uses output voltage to combine the combined control of capacitance current, and continued flow switch pipe uses dynamic afterflow to control；Its tool
Body embodiment is: in each switch periods, the output voltage of two output branch roads of detection, output electric current, capacitance current,
To signal VoaAnd Vob、IoaAnd Iob、IcaAnd Icb；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 produce
Signal Ve1, by VobWith voltage reference value Vref2It is sent to the second error amplifier EA2 and produces signal Ve2；By Ve1、Ve2、IcaAnd Icb
Sending into the first pulse signal producer PGR and generate signal RR, clock signal clk and signal RR produce through the first trigger RS1
Pulse signal Vp1, in order to control the turn-on and turn-off of changer main switch；Clock signal clk produces through the 3rd trigger D
Pulse signal VpaAnd Vpb, in order to control the turn-on and turn-off of changer branch switch pipe；By Ica、Icb、IoaAnd IobIt is sent to
Two pulse signal producer PGS generate signal SS；The Q end signal of signal SS and the first trigger RS1 is through the second trigger RS2
Produce pulse signal Vp2, in order to control the turn-on and turn-off of continued flow switch pipe.
2. the pseudo-combined dynamic follow current control device of continuous conduction mode single-inductance double-output switch converters, its feature exists
In: include the first voltage detecting circuit VS1, the second voltage detecting circuit VS2, the first current detection circuit IS1, the second electric current inspection
Slowdown monitoring circuit IS2, the 3rd current detection circuit IS3, the 4th current detection circuit IS4, the first error amplifier EA1, the second error
Amplifier EA2, the first pulse signal producer PGR, the second pulse signal producer PGS, the first trigger RS1, the second triggering
Device RS2, the 3rd trigger D, the first drive circuit DR1, the second drive circuit DR2, the 3rd drive circuit DR3 and 4 wheel driven galvanic electricity
Road DR4；The first described voltage detecting circuit VS1 and the first error amplifier EA1 be connected, the second voltage detecting circuit VS2 with
Second error amplifier EA2 is connected；First voltage detecting circuit VS1, the second voltage detecting circuit VS2, the first error amplifier
EA1, the second error amplifier EA2, the Q1 end of the 3rd trigger D and Q end, the first current detection circuit IS1, the second current detecting
Circuit I S2 is all connected with the first pulse signal producer PGR；First pulse signal producer PGR and the R of the first trigger RS1
End is connected；Described the first current detection circuit IS1, the second current detection circuit IS2, the 3rd current detection circuit IS3, the 4th
Current detection circuit IS4, the Q1 end of the 3rd trigger D is all connected with the second pulse signal producer PGS with Q end；Second pulse
The S end of signal generator PGS and the second trigger RS2 is connected, clock signal clk respectively with the S end of the first trigger RS1 and the
The C end of three trigger D is connected, and meanwhile, the Q1 end of the 3rd trigger D is linked into D end；The Q end of the first trigger RS1 connects first
Drive circuit DR1, the Q end of the 3rd trigger D connects the Q1 end of the second drive circuit DR2, the 3rd trigger D and connects the 3rd driving
The Q end of circuit DR3, the second trigger RS2 connects the 4th drive circuit DR4.
Device the most according to claim 2, it is characterised in that: the first described pulse signal producer PGR includes first
Adder ADD1, second adder ADD2, the first comparator CMP1, the second comparator CMP2, first and door AND1, second and door
AND2, and first or door OR1；The outfan of the first voltage detecting circuit VS1 is connected to the input of first adder ADD1,
The outfan of the first current detection circuit IS1 is defeated by being connected to another of first adder ADD1 after multiplier that coefficient is k1
Enter end；The outfan of the second voltage detecting circuit VS2 is connected to the input of second adder ADD2, the second current detection circuit
The outfan of IS2 is connected to another input of second adder ADD2 by the multiplier that coefficient is k2；First error is amplified
The outfan of device EA1 and the outfan of first adder ADD1 are connected respectively to the input of the first comparator CMP1, and second by mistake
The outfan of difference amplifier EA2 and the outfan of second adder ADD2 are connected respectively to the input of the second comparator CMP2；
The outfan of the first comparator CMP1 and the Q output of the 3rd trigger D are connected respectively to the input of first and door AND1, the
The Q1 outfan of two comparator CMP2 outfans and the 3rd trigger D is connected respectively to the input of second and door AND2；First
It is connected respectively to first or the input of door OR1 with the outfan of door AND1 and the outfan of second and door AND2.
Device the most according to claim 2, it is characterised in that: the second described pulse signal producer PGS includes the 3rd
Comparator CMP3, the 4th comparator CMP4, the 3rd and door AND3, the 4th and door AND4, and second or door OR2；First electric current
The outfan of testing circuit IS1 and the outfan of the 3rd current detection circuit IS3 are connected respectively to the defeated of the 3rd comparator CMP3
Entering end, the outfan of the second current detection circuit IS2 and the outfan of the 4th current detection circuit IS4 are connected respectively to the 4th ratio
The relatively input of device CMP4；The outfan of the 3rd comparator CMP3 and the Q output of the 3rd trigger D be connected respectively to the 3rd with
Door AND3 input, the outfan of the 4th comparator CMP4 and the Q1 outfan of the 3rd trigger D be connected respectively to the 4th with
The input of door AND4；3rd is connected respectively to second or door with the outfan of door AND3 and the outfan of the 4th and door AND4
The input of OR2.
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| CN112398342A (en) * | 2021-01-21 | 2021-02-23 | 四川大学 | Frequency conversion control device and method for combined single-inductor dual-output switch converter |
| CN113452148A (en) * | 2021-06-08 | 2021-09-28 | 华中科技大学 | Auxiliary power supply with information transmission function for modular converter |
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