CN106208684B - A kind of combined control method of single-inductance double-output switch converters and its device - Google Patents

A kind of combined control method of single-inductance double-output switch converters and its device Download PDF

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CN106208684B
CN106208684B CN201610723239.0A CN201610723239A CN106208684B CN 106208684 B CN106208684 B CN 106208684B CN 201610723239 A CN201610723239 A CN 201610723239A CN 106208684 B CN106208684 B CN 106208684B
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output
trigger
detection circuit
door
output end
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CN106208684A (en
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周国华
冷敏瑞
刘啸天
周述晗
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Southwest Jiaotong University
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Southwest Jiaotong University
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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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of combined dynamic afterflow control method of puppet continuous conduction mode single-inductance double-output switch converters and its devices, in conjunction with output voltage and capacitance current information, type control is combined to switch converters main switch, continued flow switch pipe is controlled into Mobile state afterflow by capacitance current and load current, realizes the separately adjustable of each output branch.Puppet continuous conduction mode single-inductance double-output switch converters using the present invention have stability good, and the cross influence exported between branch is small, and input, load transient response speed are fast, it is efficient the advantages that.

Description

A kind of combined control method of single-inductance double-output switch converters and its device
Technical field
The present invention relates to the control method of multiple-channel output switch converters and its devices, belong to power electronic equipment field, The combined dynamic afterflow control method of specially a kind of pseudo- continuous conduction mode single-inductance double-output switch converters and its device.
Background technology
Disparate modules in smart mobile phone, digital product usually require different supply voltages, therefore, are set with portable Standby is extensive universal, and it is very necessary to study the switch converters with multiple-channel output ability.Single inductance multi-output switching transformation Utensil has that system bulk is small, at low cost, and can realize the advantage separately adjustable to output branch, can be widely applied to tablet electricity Brain, portable information device, the fields such as LED drivings.
It is similar with single output switch converters, 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, the strong, inductance with load capacity The small advantage of current ripples, but since two output branches share an inductance, each output branch is coupling in one by inductance It rises, there are cross influences between output branch；It is real since each output branch is there are the stage that inductive current is zero when working in DCM Show power decoupled, avoids cross influence, but there is larger current ripples and EMI noises under large-power occasions, it is only suitable For small-power occasion；When working in PCCM, the advantages of having taken into account CCM and DCM switch converters, both can effectively inhibit to intersect shadow It rings, 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 Have the advantages that realize simple, strong antijamming capability, but influenced 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 transformation The overcurrent protection of device, but average current cannot be accurately controlled, load transient response speed is not improved.Other types of electricity The control accuracy and input mapping of electric current has been respectively increased if Average Current Control and valley point current control in flow control, but Still without improving load transient performance.V2Control is a kind of voltage double -loop control of " voltage-type "+" voltage-type " combination, outside Ring is identical as peak value comparison method, and inner ring contains the information of output voltage ripple；When load changes, due to inductive current It cannot be mutated, the variation of load current is embodied in output capacitance branch first, is caused on output capacitance equivalent series resistance The variation of ripple voltage, therefore, the control method have quick transient response speed to load variation.But work as output capacitance Equivalent series resistance it is smaller when, output voltage ripple is nonlinear, and converter can not steady operation.On the other hand, afterflow The control of switching tube also has a significant impact to the characteristic of PCCM switch converters.The afterflow control of traditional PCCM switch converters is adopted (Constant-Reference-Current, CRC) mode is controlled with constant reference current, the control mode is in underloading condition Under transducer effciency it is relatively low.In order to improve the efficiency of converter, freewheel current value can be adjusted in different loads.
Invention content
The object of the present invention is to provide a kind of control method and its device of single-inductance double-output switch converters, it is allowed to gram Take the technical disadvantages of existing PCCM single-inductance double-outputs switch converters, at the same with good stability and mapping, compared with Small cross influence and higher transducer effciency, and the single-inductance double-output switch change-over of various topological structures can be suitable for Device.
The technical solution adopted by 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 are adopted With the combined control of output voltage combination capacitance current, continued flow switch pipe is controlled using dynamic afterflow；Its specific implementation mode For：In each switch periods, output voltage, output current, the capacitance current of two output branches are detected, signal V is obtainedoaWith Vob、IoaAnd Iob、IcaAnd Icb；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, will VobWith voltage reference value Vref2It is sent to the second error amplifier EA2 and generates signal Ve2；By Ve1、Ve2、IcaAnd IcbIt is sent into first Pulse signal producer PGR generates signal RR, clock signal clk and signal RR and generates pulse signal by the first trigger RS1 Vp1, to control the turn-on and turn-off of converter main switch；Clock signal clk generates pulse signal by third trigger D VpaAnd Vpb, to control the turn-on and turn-off of converter branch switch pipe；By Ica、Icb、IoaAnd IobIt is sent to the second pulse letter Number generator PGS generates signal SS；The Q end signals of signal SS and the first trigger RS1 generate arteries and veins by the second trigger RS2 Rush signal Vp2, to control the turn-on and turn-off of continued flow switch pipe.
A kind of combined dynamic follow current control device of puppet continuous conduction mode single-inductance double-output switch converters, including the One voltage detecting circuit VS1, second voltage detection circuit VS2, the first current detection circuit IS1, the second current detection circuit IS2, third 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, Third trigger D, 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, and second voltage detection circuit VS2 and second is missed Poor amplifier EA2 is connected；First voltage detection circuit VS1, second voltage detection circuit VS2, the first error amplifier EA1, Two error amplifier EA2, the ends Q1 of third trigger D and the ends Q, the first current detection circuit IS1, the second current detection circuit IS2 is connected with the first pulse signal producer PGR；The ends the R phase of first pulse signal producer PGR and the first trigger RS1 Even；The first current detection circuit IS1, the second current detection circuit IS2, third current detection circuit IS3, the 4th electric current The ends Q1 and the ends Q of detection circuit IS4, third trigger D are connected with the second pulse signal producer PGS；Second pulse signal Generator PGS is connected with the ends S of the second trigger RS2, clock signal clk respectively with the ends S of the first trigger RS1 and third The C-terminal of trigger D is connected, meanwhile, the ends Q1 of third trigger D are linked into the ends D；The ends the Q connection first of first trigger RS1 is driven The ends Q of dynamic circuit DR1, third trigger D connect the second driving circuit DR2, the ends the Q1 connection third driving electricity of third trigger D The ends Q of road DR3, the second trigger RS2 connect the 4th driving circuit DR4.
Further, the first pulse signal producer PGR includes first adder ADD1, second adder ADD2, first comparator CMP1, the second comparator CMP2, first with door AND1, second and door AND2 and first or door OR1； The output end of first voltage detection circuit VS1 is connected to the input terminal of first adder ADD1, the first current detection circuit IS1's Output end is connected to another input terminal of first adder ADD1 by coefficient after the multiplier of k1；Second voltage detection circuit The output end of VS2 is connected to the input terminal of second adder ADD2, and the output end of the second current detection circuit IS2 passes through coefficient Another input terminal of second adder ADD2 is connected to for the multiplier of k2；The output end and first of first error amplifier EA1 The output end of adder ADD1 is connected respectively to the input terminal of first comparator CMP1, the output end of the second error amplifier EA2 The input terminal of the second comparator CMP2 is connected respectively to the output end of second adder ADD2；The output of first comparator CMP1 The Q output of end and third trigger D are connected respectively to the input terminal of first and door AND1, the second comparator CMP2 output ends with The Q1 output ends of third trigger D are connected respectively to the input terminal of second and door AND2；First with the output end of door AND1 and the Two are connected respectively to the input terminal of first or door OR1 with the output end of door AND2.
Further, the second pulse signal producer PGS includes third comparator CMP3, the 4th comparator CMP4, third and door AND3, the 4th and door AND4 and second or door OR2；The output end of first current detection circuit IS1 and The output end of third current detection circuit IS3 is connected respectively to the input terminal of third comparator CMP3, the second current detection circuit The output end of the output end of IS2 and the 4th current detection circuit IS4 are connected respectively to the input terminal of the 4th comparator CMP4；Third The output end of comparator CMP3 and the Q output of third trigger D are connected respectively to the input terminal of third and door AND3, the 4th ratio The Q1 output ends of output end and third trigger D compared with device CMP4 are connected respectively to the input terminal of the 4th and door AND4；Third with The output end of door AND3 and the output end of the 4th and door AND4 are connected respectively to the input terminal of second or door OR2.
Compared with prior art, the beneficial effects of the invention are as follows：
One, the present invention provides a kind of effective control method for PCCM single-inductance double-output switch converters, has fine Stability；When wherein one, which exports branch circuit load, changes, the voltage of another output branch is basically unchanged, and is had very Small cross influence.
Two, V-CRC (is denoted as using the control method of CRC controls using voltage mode control, continued flow switch pipe with main switch Control) it compares, PCCM single-inductance double-outputs switch converters of the invention can be adjusted quickly when input voltage changes The turn-on and turn-off of main switch and branch switch pipe, output voltage overshoot is small, and regulating time is short, and input mapping is good.
Three, compared with V-CRC is controlled, PCCM single-inductance double-outputs switch converters of the invention have when loading variation The overshoot of quick transient response speed, output voltage is small, and the cross influence between branch is small.
Four, compared with V-CRC is controlled, PCCM single-inductance double-outputs switch converters of the invention lead under fully loaded transportation condition It crosses dynamic and improves freewheel current value, so that converter is worked in PCCM always, ensure the cross influence of very little；Under the conditions of underloading, lead to Crossing dynamic reduces freewheel current value, avoids freewheeling period long, to improve light-load efficiency.
Description of the drawings
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 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.
Main waveform when Fig. 5 is the PCCM single-inductance double-output switch converters steady operations of the embodiment of the present invention one shows It is intended to.
Fig. 6 is imitative for the transient state time domain of the embodiment of the present invention one and the converter TD of V-CRC controls in input voltage mutation True waveform.
Fig. 7 output voltage transient states when a branch circuit loads are mutated for the embodiment of the present invention one and the converter TD of V-CRC controls Time-domain-simulation oscillogram.
Fig. 8 output voltage transient states when b branch circuit loads are mutated for the embodiment of the present invention one and the converter TD of V-CRC controls Time-domain-simulation oscillogram.
Fig. 9 is that the converter TD of the present invention and V-CRC controls is respectively adopted with the efficiency curve diagram loaded when changing.
Figure 10 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 11 is the circuit structure block diagram of the embodiment of the present invention two.
Specific implementation mode
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 implementation mode of the invention is：PCCM single-inductance double-output switch converters are combined dynamic State follow current control device, mainly by first voltage detection circuit VS1, second voltage detection circuit VS2, the first current detecting electricity Road IS1, the second current detection circuit IS2, third current detection circuit IS3, the 4th current detection circuit IS4, the first error are put Big device EA1, the second error amplifier EA2, the first pulse signal producer PGR, the second pulse signal producer PGS, first touches Send out device RS1, the first trigger RS2, third trigger D, the first driving circuit DR1, the second driving circuit DR2, third driving electricity Road DR3 and the 4th driving circuit DR4 compositions；In each switch periods, output voltage, the output electricity of two output branches are detected Stream and capacitance current, obtain signal VoaAnd Vob、IoaAnd Iob、IcaAnd Icb；By VoaWith preset voltage reference value Vref1It is sent to First error amplifier EA1 generates error amplification signal Ve1, by VobWith preset voltage reference value Vref2It is sent to the second error Amplifier EA2 generates error amplification signal Ve2；By Ve1、Ve2、IcaAnd IcbIt is sent into the first pulse signal producer PGR and generates signal RR, clock signal clk and signal RR generate pulse signal V by the first trigger RS1p1, to control converter main switch Turn-on and turn-off；Clock signal clk generates pulse signal V by third trigger DpaAnd Vpb, to control converter branch 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 signals of SS and the first trigger RS1 generate pulse signal V by the second trigger RS2p2, to control continued flow switch pipe Switch off and on.
Wherein, the function of the first pulse generator PGR is：By comparing the combination of each branch output voltage, capacitance current Signal and error amplification signal, to generate the reset signal RR of the first trigger RS1；The function of second pulse generator PGS For：By comparing the signal of each branch output current and capacitance current, to generate the set signal SS of the second trigger RS2； First trigger RS1 and the second trigger RS2 is all made of rest-set flip-flop structure, and third trigger RS3 uses d type flip flop structure.
Fig. 2 shows the first pulse generator PGR's of this example specifically comprises：By first adder ADD1, the second addition Device ADD2, first comparator CMP1, the second comparator CMP2, first and door AND1, second and door AND2 and first or door OR1 is formed；By the output signal V of first voltage detection circuit VS1oa, the first current detection circuit IS1 output signal IcaMultiply To be sent into the input terminal of first adder ADD1 after coefficient k 1, the output termination first comparator CMP1's of first adder ADD1 Positive ends；By the output signal V of second voltage detection circuit VS2ob, the second current detection circuit IS2 output signal IcbMultiply To be sent into the input terminal of second adder ADD2 after coefficient k 2, the output of second adder ADD2 terminates the second comparator CMP2 Positive ends；The output signal V of first error amplifier EA1, the second error amplifier EA2e1、Ve2First is connect respectively to compare The negative polarity end of device CMP1 and the second comparator CMP2；The switch management and control of output end and a the output branch of first comparator CMP1 Signal V processedpaConnect the input terminal of first and door AND1, the switch controlled of the output end and output branch b of the second comparator CMP2 Signal VpbConnect the input terminal of second and door AND2；The output of first and door AND1 and second and door AND2 terminates first or door OR1 Input terminal.Wherein, k1, k2 are amplification coefficient.
Fig. 3 shows that the second pulse generator PGS's of this example specifically comprises：Compared by third comparator CMP3, the 4th Device CMP4, third are formed with door AND3, the 4th and door AND4 and second or door OR2；By the first current detection circuit IS1's Output end is connected to the negative polarity end of third comparator CMP3, and the output end access third of third current detection circuit IS3 compares The positive ends of device CMP3；The output end of second current detection circuit IS2 is connected to the negative polarity end of the 4th comparator CMP4, The output end of 4th current detection circuit IS4 is connected to the positive ends of the 4th comparator CMP4；Third comparator CMP3's is defeated The Q output of outlet and third trigger D connect the input terminal of third and door AND3, the 4th comparator CMP4 output ends and the The input terminal of Q1 output ends connection the 4th and door AND4 of three trigger D；The output of third and door AND3 and the 4th and door AND4 The input terminal of second or door OR2 of end connection.
This example uses the device of Fig. 4, can easily and quickly realize above-mentioned control method.Fig. 4 shows that this example PCCM is mono- electric The combined dynamic follow current control device of dual output switch converters is felt, by switch converters TD and switching tube S1、Sa、Sb, afterflow Switching tube S2Control device composition.
Its working process and principle of the device of this example are：
Control device using the combined dynamic afterflow control of PCCM single-inductance double-output switch converters the course of work and Principle is：If Fig. 4, Fig. 5 are shown, when each switch periods start, clock signal clk exports high level, i.e. third trigger D's C-terminal input high level, the ends the Q control wave V of third trigger DpaFor high level, converter branch switch pipe SaConducting, a Branch works, according to the operation principle of third trigger D：VpaIt is remained unchanged before next high level of signal CLK arrives, Since the Q1 output ends of third trigger D are connected with the ends D, control wave VpaAnd VpbIt is respectively turned on half in one cycle A period, and low and high level is opposite always.Meanwhile first trigger RS1 the ends S input high level, the Q of the first trigger RS1 Hold control wave Vp1For high level, main switch S1Conducting, the ends R of the ends the Q connection RS2 of the first trigger RS1, afterflow are opened Close pipe S2Shutdown, capacitance current IcaRise, output voltage VoaRise；As output voltage VoaWith capacitance current IcaSuperposed signal Rise to control signal Ve1When, the ends the R input signal RR of the first trigger RS1 is high level, the first trigger RS1 outputs Control wave Vp1Become low level, S1It disconnects, capacitance current IcaDecline, output voltage VoaIt reduces；As capacitance current Ica Drop to output current IoaWhen, the ends the S input signal SS of the second trigger RS2 is high level, the second trigger RS2 outputs Control wave Vp2Become high level, continued flow switch pipe S2Conducting；After half period is connected in a branches, clock signal clk is again Export high level, since the Q1 output ends of third trigger D are connected with the ends D, the ends the Q1 control wave V of third trigger Dpb For high level, branch switch pipe SbConducting, the work of b branches, switching tube S1And continued flow switch pipe S2Control wave Vp1With Vp2Production method when working to branch a production method it is similar.
First pulse signal producer PGR completes the generation and output of signal RR：Fig. 2 shows output voltage VoaWith capacitance Electric current IcaSuperposed signal higher than control signal Ve1When, the output signal of first comparator CMP1 is high level, conversely, being low Level；Output voltage VobWith capacitance current IcbSuperposed signal higher than control signal Ve2When, the output letter of the second comparator CMP2 Number be high level, conversely, be low level；When the output signal and pulse signal V of first comparator CMP1paIt is high level simultaneously When, first is open-minded with door AND1, and second is blocked with door AND2, and first or door OR1 output signals RR is high level；Equally, when The output signal and pulse signal V of second comparator CMP2pbSimultaneously for high level when, second is open-minded with door AND2, first and door AND1 is blocked, and first or door OR1 output signals RR is high level.
Second pulse signal producer PGS completes the generation and output of signal SS：Fig. 3 shows, capacitance current IcaSignal is low In output current IoaWhen, the output signal of third comparator CMP3 is high level, conversely, being low level；Capacitance current IcbSignal Less than output current IobWhen, the output signal of the 4th comparator CMP4 is high level, conversely, being low level；When third comparator The output signal and pulse signal V of CMP3paWhen being high level simultaneously, third and door AND3 are open-minded, and the 4th is blocked with door AND4, Second or door OR2 output signals SS is high level；Equally, when the output signal and pulse signal V of the 4th comparator CMP4pbSimultaneously For high level when, the 4th is open-minded with door AND4, and third is blocked with door AND3, and second or door OR2 output signals SS is high electricity It is flat.
The switch converters TD of this example is PCCM 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. 5 be one converter of the embodiment of the present invention in steady operation, clock signal clk, inductor current signal IL, arteries and veins Rush signal RR, pulse signal SS and drive signal Vpa、Vpb、Vp1、Vp2Between relation schematic diagram.It can be seen from the figure that using The single-inductance double-output switch converters of the present invention can be operated in PCCM.
The simulated conditions of Fig. 5 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, branch switch pipe switching frequency are 20kHz, switch Pipe S1、S2、Sa、SbEquivalent parasitic resistance be 50m Ω, the conduction voltage drop of diode D1, D2 is 0.4V, capacitance current IcaAnd Icb Coefficient k 1, k2 be 0.
Fig. 6 is using the present invention and the PCCM single-inductance double-output Buck converters of V-CRC controls in input voltage mutation When (input voltage VinChange from 20V → 40V), the transient state time-domain-simulation waveform of two output branch output voltages.Simulated conditions with Fig. 5 is consistent.As can be seen from the figure：The output voltage V of switch converters a, b output branch using the present inventionoa、Vob, After input voltage mutation, stable state is just reentered almost without adjustment process；It can be seen that the mono- inductance lose-lose of PCCM of the present invention Go out Buck converters input mapping it is good, regulating time is short, output voltage transient changing amount very little, anti-incoming wave kinetic force By force.
Fig. 7, Fig. 8 are respectively to be exported using the PCCM single-inductance double-output Buck converters of the present invention and V-CRC controls Branch a load sudden changes (the output current I of output branch aoaChange from 1A → 0.5A), output branch b load sudden changes (output branch The output current I of bobFrom 0.5A → 1A change) when two output branch output voltages time-domain-simulation oscillogram.Fig. 7, Fig. 8's is imitative True condition is consistent with Fig. 5.As can be seen from the figure：PCCM single-inductance double-outputs Buck switch converters using the present invention are born The output voltage transient changing amount carried after mutation is small, and regulating time is very short, and load transient performance is good, and an output branch is negative It is very small to the cross influence of another output branch to carry mutation.
Fig. 9 is the efficiency curve diagram of the PCCM single-inductance double-output Buck converters using the present invention and V-CRC controls.By For Fig. 9 it is found that when bearing power is larger, two methods downconverter all has higher efficiency；With the reduction of bearing power, It is declined to a great extent rapidly using the efficiency of the PCCM single-inductor dual-output converters of V-CRC controls；And PCCM using the present invention is mono- Inductance dual-output converter efficiency when bearing power reduces maintains always high value, and increases.
Such as PCCM single-inductance double-output Buck converters two output when exporting branch a load sudden changes that Figure 10 is the present invention The time-domain-simulation oscillogram of branch output voltage.With Fig. 5 simulated conditions the difference is that：Capacitance current IcaAnd IcbWeighting Coefficient k 1, k2 are 0.2, output capacitance CoaAnd CobEquivalent series resistance be 5m Ω.It can be seen from the figure that electricity is added After capacitance current, when output capacitance equivalent series resistance very little, PCCM single-inductance double-output Buck converters remain to steady operation, And its load transient response speed is had substantially no effect on, the cross influence very little between two output branches has good stability.
Embodiment two
As shown in figure 11, this example and embodiment one are essentially identical, are a difference in that：This example control converter TD be PCCM single-inductance double-output single-end ortho-exciting code converters.
The present invention is in addition to it can be used for the single-inductance double-output switch converters in above example, it can also be used to which PCCM is mono- In a variety of multiple output circuit topologys such as inductance dual output half-bridge converter, PCCM single-inductance double-output full-bridge converters.

Claims (4)

1. a kind of combined control method of single-inductance double-output switch converters, it is characterised in that：The converter is connected using pseudo- Continuous conduction mode, main switch use the combined control of output voltage combination capacitance current, continued flow switch pipe continuous using dynamic Flow control；Its specific implementation mode is：In each switch periods, detect the output voltages of two output branches, output current, Capacitance current obtains signal VoaAnd Vob、IoaAnd Iob、IcaAnd Icb；It will
VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobWith voltage reference value Vref2 It is sent to the second error amplifier EA2 and generates signal Ve2；By Ve1、Ve2、IcaAnd IcbIt is sent into the first pulse signal producer PGR lifes At signal RR, clock signal clk and signal RR generate pulse signal V by the first trigger RS1p1, to control converter master The turn-on and turn-off of switching tube；Clock signal clk generates pulse signal V by third trigger DpaAnd Vpb, to control transformation The turn-on and turn-off of device branch switch pipe；By Ica、Icb、IoaAnd IobIt is sent to the second pulse signal producer PGS and generates signal SS；The Q end signals of signal SS and the first trigger RS1 generate pulse signal V by the second trigger RS2p2, to control afterflow The turn-on and turn-off of switching tube.
2. a kind of combined control device of single-inductance double-output switch converters, it is characterised in that：Electricity is detected including first voltage Road VS1, second voltage detection circuit VS2, the first current detection circuit IS1, the second current detection circuit IS2, the inspection of third electric current Slowdown monitoring circuit IS3, the 4th current detection circuit IS4, the first error amplifier EA1, the second error amplifier EA2, the first pulse letter Number generator
PGR, the second pulse signal producer PGS, the first trigger RS1, the second trigger RS2, third trigger D, first drives Dynamic 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, and second voltage detection circuit VS2 is connected with the second error amplifier EA2；The One voltage detecting circuit VS1, second voltage detection circuit VS2, the first error amplifier EA1, the second error amplifier EA2, The ends Q1 and the ends Q of three trigger D, the first current detection circuit IS1, the second current detection circuit IS2 with the first pulse signal Generator PGR is connected；First pulse signal producer PGR is connected with the ends R of the first trigger RS1；The first electric current inspection Slowdown monitoring circuit IS1, the second current detection circuit IS2, third current detection circuit IS3, the 4th current detection circuit IS4, third are touched The ends Q1 and the ends Q of hair device D is connected with the second pulse signal producer PGS；The triggerings of second pulse signal producer PGS and second The ends S of device RS2 are connected, and clock signal clk is connected with the C-terminal at the ends S of the first trigger RS1 and third trigger D respectively, together When, the ends Q1 of third trigger D are linked into the ends D；The ends Q of first trigger RS1 connect the first driving circuit DR1, third triggering The ends Q of device D connect the second driving circuit DR2, and the ends Q1 of third trigger D connect third driving circuit DR3, the second trigger The ends Q of RS2 connect the 4th driving circuit DR4.
3. the apparatus of claim 2, it is characterised in that：The first pulse signal producer PGR includes first Adder ADD1, second adder ADD2, first comparator CMP1, the second comparator CMP2, first and door AND1, second and door AND2 and first or door OR1；The output end of first voltage detection circuit VS1 is connected to the input terminal of first adder ADD1, The output end of first current detection circuit I S1 is connected to the another of first adder ADD1 by coefficient after the multiplier of k1 Input terminal；The output end of second voltage detection circuit VS2 is connected to the input terminal of second adder ADD2, the second current detecting electricity The output end of road I S2 is connected to another input terminal of second adder ADD2 by the multiplier that coefficient is k2；First error is put The output end of big device EA1 and the output end of first adder ADD1 are connected respectively to the input terminal of first comparator CMP1, and second The output end of error amplifier EA2 and the output end of second adder ADD2 are connected respectively to the input of the second comparator CMP2 End；The output end of first comparator CMP1 and the Q output of third trigger D are connected respectively to the input of first and door AND1 The Q1 output ends of end, the second comparator CMP2 output ends and third trigger D are connected respectively to the input terminal of second and door AND2； First is connected respectively to the input terminal of first or door OR1 with the output end of door AND1 and second with the output end of door AND2.
4. the apparatus of claim 2, it is characterised in that：The second pulse signal producer PGS includes third Comparator CMP3, the 4th comparator CMP4, third and door AND3, the 4th and door AND4 and second or door OR2；First electric current The output end of detection circuit IS1 and the output end of third current detection circuit IS3 are connected respectively to the defeated of third comparator CMP3 Enter to hold, the output end of the output end of the second current detection circuit IS2 and the 4th current detection circuit IS4 are connected respectively to the 4th ratio Compared with the input terminal of device CMP4；The output end of third comparator CMP3 and the Q output of third trigger D be connected respectively to third with The input terminal of door AND3, the output end of the 4th comparator CMP4 and the Q1 output ends of third trigger D be connected respectively to the 4th with The input terminal of door AND4；Third and the output end of the output end of door AND3 and the 4th and door AND4 are connected respectively to second or door The input terminal of OR2.
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