CN106253666B - Single-inductance double-output switch converters method for controlling frequency conversion and its control device - Google Patents

Single-inductance double-output switch converters method for controlling frequency conversion and its control device Download PDF

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Publication number
CN106253666B
CN106253666B CN201610727586.0A CN201610727586A CN106253666B CN 106253666 B CN106253666 B CN 106253666B CN 201610727586 A CN201610727586 A CN 201610727586A CN 106253666 B CN106253666 B CN 106253666B
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signal
output
trigger
detection circuit
door
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CN106253666A (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
    • 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
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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 single-inductance double-output switch converters method for controlling frequency conversion and its control devices, with reference to output voltage and inductive current information, switch converters main switch is controlled using conversion method, inductive current information is used as slope compensation, and ensureing being capable of steady operation when output capacitance equivalent series resistance is smaller；By the way that in each switch periods, the turn-off time of fixed main switch carrys out the turn-on and turn-off of indirect control continued flow switch pipe, realizes the dynamic afterflow of inductive current, so as to fulfill 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

Single-inductance double-output switch converters method for controlling frequency conversion and its control device
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 single-inductance double-output switch converters method for controlling frequency conversion and its control device.
Background technology
The development of portable electronic product proposes increasingly higher demands to multivoltage output switch power source, makes multichannel defeated The switch converters gone out become hot spot of concern.Traditional multiple-channel output switch converters magnetic element is more, and volume is big, And list inductance multi-output switching converter is small, at low cost with system bulk, and can realize separately adjustable to output branch Advantage is widely used in the fields such as tablet computer, portable information device, LED drivings.
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 is double Cross influence is substantially not present, and can be by increasing afterflow reference value so as to improve between the output branch of output switch converters Converter load capacity, but due to the addition of continued flow switch pipe, reduce the efficiency of converter.Above-mentioned single-inductance double-output switch All output branches of converter work in same conduction mode, however, when export branch circuit load differ greatly when, load compared with There are the characteristics of ripple is big, efficiency is low for light output branch；And single-inductance double-output switch converters respectively export wanting for branch Asking 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, according to the realization method of duty ratio, It can be classified as constant frequency control and two major class of frequency control.Constant frequency control is that switch periods are invariable, is opened by adjusting one The turn-on time of period internal power device is closed to adjust output voltage；Frequency control adjusts output electricity by changing switching frequency Pressure, such as constant on-time control, constant off-time control and Hysteresis control.Compared with constant frequency controls, frequency control has The advantages of mapping is good, and light-load efficiency is high.On the other hand, the control of continued flow switch pipe is to the characteristic of PCCM switch converters Have a significant impact.The afterflow control of traditional PCCM switch converters controls (constant- using constant reference current Reference-current, CRC) mode, transducer effciency of the control mode under the conditions of underloading be relatively low.Become to improve The efficiency of parallel operation can adjust freewheel current value in different loads.
Invention content
The object of the present invention is to provide a kind of control methods of hybrid conductive pattern single-inductance double-output switch converters, make The technical disadvantages for overcoming existing single-inductance double-output switch converters, while 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：
Single-inductance double-output switch converters method for controlling frequency conversion, main switch is using output voltage combination inductive current Frequency control realizes the dynamic afterflow of inductive current by the turn-off time that main switch is fixed in each switch periods； In each switch periods, inductive current is detected, obtains signal IL, detection two output branches output voltage obtain signal VoaWith Vob；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobAnd voltage reference value Vref2It is sent to the second error amplifier EA2 and generates signal Ve2；By ILIt is sent into the first pulse signal producer PGS and generates signal SS；By IL、Voa、Vob、Ve1And Ve2And Vpa、VpbIt is sent into the second pulse signal producer PGR generation signals RR and Vb；By first The Q1 of trigger RS1 terminates the input terminal into the first conducting timer TON1, then the output of the first conducting timer TON1 is believed Number Vton1The first trigger RS1, which is sent into, with signal SS generates pulse signal VpaAnd Vpb, to control converter branch switch pipe Turn-on and turn-off；By signal Vton1With signal VpbThe signal and signal RR generated through first or door OR1 is sent into the second trigger RS2 Generate pulse signal Vp1, to control the turn-on and turn-off of converter main switch；Signal VbWith signal VpaBy second or door OR2 generates signal Vor；Signal VorSignal V is generated through the second conducting timer TON2ton2；Signal Vp1The letter generated through NOT gate NOT Number and signal Vton2By generating pulse signal V with door ANDp2, to the turn-on and turn-off of convertor controls continued flow switch pipe.
The control device of the single-inductance double-output switch converters method for controlling frequency conversion, including first voltage detection circuit VS1, second voltage detection circuit VS2, current detection circuit IS, the first error amplifier EA1, the second error amplifier EA2, One pulse signal producer PGS, the second pulse signal producer PGR, the first trigger RS1, the second trigger RS2, first or Door OR1, second or door OR2, the first conducting timer TON1, the second conducting timer TON2, NOT gate NOT and door AND, first Driving circuit DR1, the second driving circuit DR2, third driving circuit DR3 and the 4th driving circuit DR4；The first voltage inspection Slowdown monitoring 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 Q1 ends of current detection circuit IS and the first trigger are connected respectively with the first pulse signal producer PGS；First voltage detects Circuit VS1, second voltage detection circuit VS2, the first error amplifier EA1, the second error amplifier EA2, current detection circuit IS, the Q1 ends of the first trigger RS1 and Q ends are connected respectively with the second pulse signal producer PGR；First pulse signal producer The SS ends of PGS are connected with the S ends of the first trigger RS1；The Q1 ends of first trigger RS1 and the first conducting timer TON1 phases Even；The output terminal of first conducting timer TON1 is connected with the R ends of the first trigger RS1；First conducting timer TON1's is defeated Outlet, the first trigger RS1 Q ends be connected respectively with first or door OR1, the output terminal and the second trigger of first or door OR1 The S ends of RS2 are connected；The RR ends of second pulse signal producer PGR are connected with the R ends of the second trigger RS2；Second pulse signal The V of generator PGRbThe Q1 ends of output terminal and the first trigger RS1 are connected respectively with second or door OR2；Second or door OR2's is defeated Outlet is connected with the second conducting timer TON2；The Q ends of second trigger RS2 are connected with NOT gate NOT；NOT gate NOT and second or The output terminal of door OR2 is connected respectively and with door AND；The first driving circuit of Q ends connection DR1 of first trigger RS1, the first triggering The Q1 ends of device RS1 connect the Q ends connection third driving circuit DR3 of the second driving circuit DR2, the second trigger RS2, with door AND Output terminal connect the 4th driving circuit DR4.
The first pulse signal producer PGS includes multiplier MULT, sampling holder S/H and first comparator CMP1；The Q1 ends of current detection circuit IS, the first trigger RS1 are connected with multiplier MULT；Current detection circuit IS is with adopting Sample retainer S/H is connected；The output terminal of multiplier MULT and sampling holder S/H are connected respectively with first comparator CMP1.
The second pulse signal producer PGR includes first adder ADD1, second adder ADD2, and second compares Device CMP2, third comparator CMP3, the first NAND gate NAND1, the second NAND gate NAND2, third NAND gate NAND3；First electricity The output terminal of pressure detection circuit VS1, the output terminal of current detection circuit IS are connect respectively with first adder ADD1, by the first electricity Press the output signal V of detection circuit VS1oa, current detection circuit IS output signal ILThe first addition is sent into after being multiplied by coefficient k 1 Device ADD1；The output terminal of second voltage detection circuit VS2 is connect with second adder ADD2, by second voltage detection circuit VS2 Output signal Vob, signal ILSecond adder ADD2 is sent into after being multiplied by coefficient k 2；First error amplifier EA1, the first addition The output terminal of device ADD1 is connected with the second comparator CMP2, the second error amplifier EA2, second adder ADD2 output terminal point It is not connected with third comparator CMP3；The Q1 ends of the output terminal of second comparator CMP2 and the first trigger RS1 connect respectively One NAND gate NAND1；The Q ends of the output terminal of third comparator CMP3 and the first trigger RS1 connect the second NAND gate respectively NAND2；First NAND gate NAND1, the second NAND gate NAND2 are connected respectively with third NAND gate NAND3, the second NAND gate The output signal of NAND2 is Vb, the output signal of third NAND gate NAND3 is RR.
Compared with prior art, the beneficial effects of the invention are as follows：
First, 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.
2nd, 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.
3rd, compared with the PCCM-PCCM inductance dual output switch converters of V-CRC controls, the present invention each by opening The turn-off time that main switch is fixed in the period of pass carrys out the turn-on and turn-off of indirect control continued flow switch pipe, realizes inductive current Dynamic afterflow, improve the light-load efficiency of converter.
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 PGS of the embodiment of the present invention one.
Fig. 3 is the circuit structure block diagram of the second pulse signal producer PGR of the embodiment of the present invention one.
Fig. 4 is the circuit structure block diagram of the embodiment of the present invention one.
Primary waves when Fig. 5 is the mixed mode single-inductance double-output switch converters steady operation of the embodiment of the present invention one Shape schematic diagram.
Fig. 6 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. 7 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. 8 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.
Fig. 9 (a) is that the PCCM-PCCM converters of converter TD and the V-CRC control of the present invention are respectively adopted in a output branch Efficiency curve diagram during the load variation of road.
Fig. 9 (b) is that the PCCM-PCCM converters of converter TD and the V-CRC control of the present invention are respectively adopted in b output branch Efficiency curve diagram during the load variation of road.
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 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 Frequency-converting control device, mainly by first voltage detection circuit VS1, second voltage detection circuit VS2, current detection circuit IS, the One error amplifier EA1, the second error amplifier EA2, the first pulse signal producer PGS, the second pulse signal producer PGR, the first trigger RS1, the second trigger RS2, first or door OR1, second or door OR2, the first conducting timer TON1, the Two conducting timer TON2, NOT gate NOT, with door AND, the first driving circuit DR1, the second driving circuit DR2, third driving circuit DR3 and the 4th driving circuit DR4 compositions；In each switch periods, inductive current is detected, obtains signal IL, detection two it is defeated The output voltage of out branch obtains signal VoaAnd Vob；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 productions Raw signal Ve1, by VobWith voltage reference value Vref2It is sent to the second error amplifier EA2 and generates signal Ve2；By ILIt is sent into the first arteries and veins It rushes signal generator PGS and generates signal SS；By IL、Voa、Vob、Ve1And Ve2It is sent into the second pulse signal producer PGR generation signals RR and Vb；By the output signal V of the first conducting timer TON1ton1The first trigger RS1, which is sent into, with signal SS generates pulse signal VpaAnd Vpb, to control the turn-on and turn-off of converter branch switch pipe；By signal Vton1With signal VpbThrough first or door OR1 The signal and signal RR of generation are sent into the second trigger RS2 and generate pulse signal Vp1, to control leading for converter main switch Logical and shutdown；Signal VbWith signal VpaSignal V is generated by second or door OR2or；Signal VorThrough the second conducting timer TON2 Generate signal Vton2；Signal Vton2With signal Vp1The signal generated through NOT gate NOT passes through generates pulse signal V with door ANDp2, use With the turn-on and turn-off of convertor controls continued flow switch pipe.
Fig. 2 shows the first pulse generator PGS's of this example specifically comprises：By multiplier MULT, sampling holder S/ H and first comparator CMP1 compositions；The output terminal of current detection circuit IS, the switch controlled signal V of a output branchespaConnection The input terminal of multiplier MULT；The negative polarity end of the output terminal connection first comparator CMP1 of multiplier MULT；Inductive current is believed Number ILSampled retainer S/H is connected with the positive ends of first comparator CMP1.
Fig. 3 shows that the second pulse generator PGR's of this example specifically comprises：By first adder ADD1, the second addition Device ADD2, the second comparator CMP2, third comparator CMP3, the first NAND gate NAND1, the second NAND gate NAND2, third with it is non- Door NAND3 compositions；By the output signal V of first voltage detection circuit VS1oa, current detection circuit IS 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 second comparator CMP2 of output terminal connection of first adder ADD1, first The output terminal of error amplifier EA1 connects the negative polarity end of the second comparator CMP2；The output terminal connection of second adder ADD2 The positive ends of third comparator CMP3, the negative polarity of the output terminal connection third comparator CMP3 of the second error amplifier EA2 End；The switch controlled signal V of output terminal and a the output branch of second comparator CMP2paConnect the first NAND gate NAND1；The The switch controlled signal V of output terminal and b the output branch of three comparator CMP3pbConnect the second NAND gate NAND2；First with it is non- The output terminal connection third NAND gate NAND3 of door NAND1 and the second NAND gate NAND2.
This example uses the device of Fig. 4, can easily and quickly realize above-mentioned control method.Fig. 4 shows, this example hybrid conductive Pattern single-inductance double-output switch converters frequency-converting control device, by switch converters TD and main switch S1, branch switch pipe Sa、Sb, continued flow switch pipe S2Control device composition.
Its working process and principle of the device of this example are：
Control device uses the course of work and original of hybrid conductive pattern single-inductance double-output switch converters frequency control Reason is：If Fig. 4, Fig. 5 are shown, as inductor current signal ILWith the switch controlled signal V of a output branchespaProduct signal under It is down to inductive current ILObtained by sampled retainer S/H during signal, the first pulse signal producer PGS output signals SS is high electricity It puts down, i.e. the S ends input high level of the first trigger RS1, the Q ends control wave V of the first trigger RS1pbFor high level, Q1 Hold control wave VpaFor low level, converter branch switch pipe SbConducting, the work of b branches, while the first conducting timer TON1 starts timing；The output terminal of first or door OR1 is high level, i.e. the S ends input high level of the second trigger RS2, second The Q ends pulse signal V of trigger RS2p1For high level, main switch S1Conducting, continued flow switch pipe S2Shutdown, inductive current ILOn It rises, output voltage VobRise；As output voltage VobWith inductive current ILThe superposed signal for being multiplied by k2 rises to control signal Ve2 When, the output signal V of the second pulse signal producer PGRbFor high level, output signal RR is high level, and the second conducting is periodically Device TON2 starts timing, and the R ends input signal of the second trigger RS2 is high level, the Q ends pulse signal of the second trigger RS2 Vp1For low level, S1It disconnects, inductive current ILDecline, output voltage VobDecline；After switching tube S1 shutdowns set time TOFF, the Two conducting timer TON2 output end signals Vton2For high level, signal V at this timep1Still for low level, then with door AND output terminal controls Pulse signal V processedp2For high level, continued flow switch pipe S2Conducting；Until first conducting timer TON1 timing terminate, signal Vton1 For high level, the R ends input high level of the first trigger RS1, the Q1 ends control wave V of the first trigger RS1paFor high electricity It is flat, converter branch switch pipe SaConducting, the work of a branches；The high level of first or door OR1 outputs simultaneously, i.e. the second trigger RS2 S ends input high level, the Q ends control wave V of the second trigger RS2p1For high level, main switch S1Conducting, afterflow Switching tube S2Shutdown, inductive current ILRise, output voltage VoaRise；As output voltage VoaWith inductive current ILIt is multiplied by the folded of k1 Plus signal rises to control signal Ve1When, the output signal RR of the second pulse signal producer PGR is high level, the second trigger The R ends input high level of RS2, the Q ends control wave V of the second trigger RS2p1Become low level, main switch S1It disconnects, Inductive current ILDecline, output voltage VoaDecline, until entering next switch periods.
First pulse signal producer PGS completes the generation and output of signal SS：Fig. 2 shows as inductive current ILWith Vpa Product be less than inductive current ILObtained by sampled retainer S/H during signal, the output signal of first comparator CMP1 is high electricity It is flat, on the contrary it is low level.
Second pulse signal producer PGR completes signal RR and VbGeneration and output：Fig. 3 shows, output voltage VoaWith Inductive current ILThe superposed signal of coefficient k 1 is multiplied by higher than control signal Ve1When, the output signal of the second comparator CMP2 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 third comparator CMP3 is high level, conversely, for low level；When the output signal and arteries and veins of the second comparator CMP2 Rush signal VpaWhen simultaneously for high level, the first NAND gate NAND1 output low levels, the second NAND gate NAND2 output high level, then Third NAND gate NAND3 output signals RR be high level, signal VbFor high level；When third comparator CMP3 output signal and Pulse signal VpbWhen simultaneously for high level, the second NAND gate NAND2 output low levels, the first NAND gate NAND1 output high level, Then third NAND gate NAND3 output signals RR be high level, signal VbFor low level.
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. 5 for one converter of the embodiment of the present invention in steady operation, inductor current signal IL, drive signal Vpa、Vpb、 Vp1、Vp2, pulse signal RR, SS and conducting timer output signal Vton1、Vton2Between relation schematic diagram.It can from figure Go out, single-inductance double-output switch converters using the present invention can be operated in CCM-PCCM mixed modes.
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 series connection Resistance Rca=Rcb=100m Ω, load resistance Roa=7 Ω, Rob=5 Ω, the set time of conducting timer 1 is 60 μ s, is connected The set time of timer 2 is 35 μ s, switching tube S1、S2、Sa、SbEquivalent parasitic resistance for 50m Ω, diode D1, D2's leads Logical pressure drop is 0.4V, inductive current ILCoefficient k 1, k2 be 0.
Fig. 6 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. 5.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. 7, Fig. 8 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. 7, Fig. 8 are consistent with Fig. 5.As can be seen from the figure：Converter TD using the present invention is in load sudden change Output voltage transient changing amount afterwards is small, and regulating time is very short, and load transient performance is good, and an output branch circuit load mutation It is smaller to the cross influence of another output branch.
Fig. 9 (a) is that the PCCM-PCCM single-inductance double-outputs Buck that converter TD using the present invention and V-CRC is controlled becomes Efficiency curve diagram of the parallel operation in a output branch circuit load variations, Fig. 9 (b) are controlled for converter TD using the present invention and V-CRC PCCM-PCCM single-inductance double-output Buck converters b output branch circuit load variation when efficiency curve diagram.By Fig. 9 (a) and For Fig. 9 (b) it is found that when bearing power is larger, two methods downconverter all has higher efficiency；With the reduction of load, It is gradually reduced using the efficiency of the PCCM-PCCM single-inductor dual-output converters of V-CRC controls；And the converter of the present invention is negative It carries efficiency when power reduces and maintains high value always, and increase.
As converter TD that Figure 10 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 0.03, 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 has substantially no effect on converter when penalty coefficient is smaller Load transient response speed, 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：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 (4)

1. single-inductance double-output switch converters method for controlling frequency conversion, it is characterised in that：Main switch is combined using output voltage The frequency control of inductive current realizes the dynamic of inductive current by the turn-off time that main switch is fixed in each switch periods State afterflow；In each switch periods, inductive current is detected, obtains signal IL, detection two output branches output voltage obtain To signal VoaAnd Vob；By VoaWith voltage reference value Vref1It is sent to the first error amplifier EA1 and generates signal Ve1, by VobAnd electricity Press a reference value Vref2It is sent to the second error amplifier EA2 and generates signal Ve2；By ILIt is sent into the first pulse signal producer PGS productions Raw signal SS；By IL、Voa、Vob、Ve1And Ve2And Vpa、VpbIt is sent into the second pulse signal producer PGR generation signals RR and Vb； The Q1 of first trigger RS1 is terminated into the input terminal into the first conducting timer TON1, then by the first conducting timer TON1's Output signal Vton1The first trigger RS1, which is sent into, with signal SS generates pulse signal VpaAnd Vpb, converter branch to be controlled to open Close the turn-on and turn-off of pipe；By signal Vton1With signal VpbThe signal and signal RR generated through first or door OR1 is sent into second and is touched It sends out device RS2 and generates pulse signal Vp1, to control the turn-on and turn-off of converter main switch；Signal VbWith signal VpaBy Two or door OR2 generates signal Vor；Signal VorSignal V is generated through the second conducting timer TON2ton2；Signal Vp1It is produced through NOT gate NOT Raw signal and signal Vton2By generating pulse signal V with door ANDp2, to convertor controls continued flow switch pipe conducting and Shutdown.
2. the control device of single-inductance double-output switch converters method for controlling frequency conversion according to claim 1, feature It is：Including first voltage detection circuit VS1, second voltage detection circuit VS2, current detection circuit IS, the amplification of the first error Device EA1, the second error amplifier EA2, the first pulse signal producer PGS, the second pulse signal producer PGR, the first triggering Device RS1, the second trigger RS2, first or door OR1, second or door OR2, the first conducting timer TON1, the second conducting timer TON2, NOT gate NOT and door AND, the first driving circuit DR1, the second driving circuit DR2, third driving circuit DR3 and 4 wheel driven Dynamic circuit DR4；The first voltage detection circuit VS1 is connected with the first error amplifier EA1, second voltage detection circuit VS2 is connected with the second error amplifier EA2；The Q1 ends of current detection circuit IS and the first trigger respectively with the first pulse signal Generator PGS is connected；First voltage detection circuit VS1, second voltage detection circuit VS2, the first error amplifier EA1, second Error amplifier EA2, current detection circuit IS, the Q1 ends of the first trigger RS1 and Q ends respectively with the second pulse signal producer PGR is connected；The SS ends of first pulse signal producer PGS are connected with the S ends of the first trigger RS1；The Q1 of first trigger RS1 End is connected with the first conducting timer TON1；The R ends phase of the output terminal and the first trigger RS1 of first conducting timer TON1 Even；The output terminal of first conducting timer TON1, the Q ends of the first trigger RS1 are connected respectively with first or door OR1, first or The output terminal of door OR1 is connected with the S ends of the second trigger RS2；The RR ends of second pulse signal producer PGR and the second trigger The R ends of RS2 are connected；The V of second pulse signal producer PGRbThe Q1 ends of output terminal and the first trigger RS1 respectively with second or Door OR2 is connected；The output terminal of second or door OR2 is connected with the second conducting timer TON2；The Q ends of second trigger RS2 and non- Door NOT is connected；The output terminal of NOT gate NOT and second or door OR2 are connected respectively and with door AND；The Q ends of first trigger RS1 connect The Q1 ends for meeting the first driving circuit DR1, the first trigger RS1 connect the Q ends company of the second driving circuit DR2, the second trigger RS2 Third driving circuit DR3 is met, the 4th driving circuit DR4 is connect with the output terminal of door AND.
3. the control device of single-inductance double-output switch converters method for controlling frequency conversion according to claim 2, feature It is：The first pulse signal producer PGS includes multiplier MULT, sampling holder S/H and first comparator CMP1； The Q1 ends of current detection circuit IS, the first trigger RS1 are connected with multiplier MULT；Current detection circuit IS is kept with sampling Device S/H is connected；The output terminal of multiplier MULT and sampling holder S/H are connected respectively with first comparator CMP1.
4. the control device of single-inductance double-output switch converters method for controlling frequency conversion according to claim 2, feature It is：The second pulse signal producer PGR includes first adder ADD1, second adder ADD2, the second comparator CMP2, third comparator CMP3, the first NAND gate NAND1, the second NAND gate NAND2, third NAND gate NAND3；First voltage The output terminal of detection circuit VS1, the output terminal of current detection circuit IS are connect respectively with first adder ADD1, by first voltage The output signal V of detection circuit VS1oa, current detection circuit IS output signal ILFirst adder is sent into after being multiplied by coefficient k 1 ADD1；The output terminal of second voltage detection circuit VS2 is connect with second adder ADD2, by second voltage detection circuit VS2's Output signal Vob, signal ILSecond adder ADD2 is sent into after being multiplied by coefficient k 2；First error amplifier EA1, first adder The output terminal of ADD1 is connected with the second comparator CMP2, the second error amplifier EA2, second adder ADD2 output terminal difference It is connected with third comparator CMP3；The Q1 ends of the output terminal of second comparator CMP2 and the first trigger RS1 connect first respectively NAND gate NAND1；The Q ends of the output terminal of third comparator CMP3 and the first trigger RS1 connect the second NAND gate respectively NAND2；First NAND gate NAND1, the second NAND gate NAND2 are connected respectively with third NAND gate NAND3, the second NAND gate The output signal of NAND2 is Vb, the output signal of third NAND gate NAND3 is RR.
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