CN107769532B - Single-inductance double-output switch converters capacitance current ripple control method and device - Google Patents
Single-inductance double-output switch converters capacitance current ripple control method and device Download PDFInfo
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- CN107769532B CN107769532B CN201711216136.6A CN201711216136A CN107769532B CN 107769532 B CN107769532 B CN 107769532B CN 201711216136 A CN201711216136 A CN 201711216136A CN 107769532 B CN107769532 B CN 107769532B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of single-inductance double-output switch converters capacitance current ripple control method and devices.Capacitance current ripple control device CTR1Detect the single-inductance double-output switch converters output voltage Voa, and capacitance current I is detected by detection circuitc1With capacitance current Ic2, generate control pulse Vgs1, to control branch switch pipe S in single-inductance double-output switch converters1Conducting and shutdown；Capacitance current ripple control device CTR2Detect the single-inductance double-output switch converters output voltage Vob, and capacitance current I is detected by detection circuitc1With capacitance current Ic2, generate control pulse Vgs2, to control main switch S in single-inductance double-output switch converters2Conducting and shutdown.The beneficial effects of the present invention are for single-inductance double-output switch converters when load changes, the control pulse of the quick regulating switch pipe of energy, output voltage overshoot is small, and regulating time is short, the load transient better performances of converter.
Description
Technical field
The present invention relates to switch converters technical field, especially a kind of single-inductance double-output switch converters capacitance current
Ripple control method and device.
Background technique
With widely available, body of the user to its power supply of the portable electronic products such as smart phone, tablet computer
The requirement of product, cost and efficiency is higher and higher.Studies have shown that single-inductance double-output switch converters can be smart phone, plate
The portable electronic products such as computer provide the independent power supply of two-way, reduce inductance and control the quantity of chip, effectively
Power volume is reduced, is reduced the production cost, transfer efficiency is improved, thus more and more by academia and industry
Concern.
Traditional peak value comparison method, control thought are: control circuit includes outer voltage and current inner loop, outside voltage
The output voltage that ring will test is compared with reference voltage, and obtained error signal is after error amplifier compensates as electricity
The reference current of inner ring is flowed, the inductive current of current inner loop detection is compared with reference current, and comparison result is used to control out
Close the shutdown of pipe；The conducting of clock signal control switch pipe；To realize the adjusting to switch converters output voltage.This method
For single-inductor dual-output converter, have cross influence between exporting branch serious, the slow-footed disadvantage of load transient response.
Summary of the invention
The object of the present invention is to provide a kind of control method and device of single-inductance double-output switch converters, are allowed to simultaneously
It is influenced with preferable load transient performance and lesser output cross, and is suitable for the more of single-inductance double-output switch converters
Kind topological structure.
Realize that the technical solution of the object of the invention is as follows:
Single-inductance double-output switch converters capacitance current ripple control method, capacitance current ripple control device CTR1Detection
The single-inductance double-output switch converters output voltage Voa, and capacitance current I is detected by detection circuitc1And capacitance current
Ic2, generate control pulse Vgs1, to control branch switch pipe S in single-inductance double-output switch converters1Conducting and shutdown；
Capacitance current ripple control device CTR2Detect the single-inductance double-output switch converters output voltage Vob, and pass through detection circuit
Detect capacitance current Ic1With capacitance current Ic2, generate control pulse Vgs2, to control in single-inductance double-output switch converters
Main switch S2Conducting and shutdown.
Further, the control pulse Vgs1Generation method are as follows: output voltage VoaWith voltage reference value Vref1By
Error amplifier EAP1Generate the error signal V of amplificationc1It is sent into comparator CMP1Negative input end, capacitance current Ic1With capacitor electricity
Flow Ic2Total capacitance current I is obtained by adder ADDcIt is sent into comparator CMP1Positive input terminal；IcAnd Vc1Comparison result
It is sent into rest-set flip-flop TGR1The end R, controlling brancher switching tube S1Shutdown；Clock signal clk is sent into rest-set flip-flop TGR1The end S,
Controlling brancher switching tube S1Conducting；The control pulse Vgs2Generation method are as follows: output voltage VobWith voltage reference value Vref2
By error amplifier EAP2Generate the error signal V of amplificationc2It is sent into comparator CMP2Negative input end, capacitance current Ic1And electricity
Capacitance current Ic2Total capacitance current I is obtained by adder ADDcIt is sent into comparator CMP2Positive input terminal；IcAnd Vc2Comparison
As a result it is sent into rest-set flip-flop TGR2The end R, control main switch S2Shutdown；Clock signal clk is sent into rest-set flip-flop TGR2S
End controls main switch S2Conducting.
Single-inductance double-output switch converters capacitance current ripple control device, including capacitance current ripple control device
CTR1, capacitance current ripple control device CTR2And detection circuit；The capacitance current ripple control device CTR1Including what is be sequentially connected
Voltage detecting circuit VS1, error amplifier EAP1, comparator CMP1, rest-set flip-flop TGR1With driving circuit DR1；EAP1It is also connected with
Reference voltage Vref1, TGR1It is also connected with clock signal clk；The capacitance current ripple control device CTR2Including the electricity being sequentially connected
Press detection circuit VS2, error amplifier EAP2, comparator CMP2, rest-set flip-flop TGR2With driving circuit DR2；EAP2It is also connected with base
Quasi- voltage Vref2, TGR2It is also connected with clock signal clk；The detection circuit includes capacitance current detection circuit IS1, capacitance current
Detection circuit IS2With adder ADD, IS1And IS2It is connected respectively to ADD, ADD is also respectively connected to CMP1And CMP2；The VS1、
VS2、IS1、IS2、DR1And DR2It is connected respectively to the single-inductance double-output switch converters.
Further, the single-inductance double-output switch converters are Buck converter, Boost, Buck-
Boost or Bipolar converter.
Compared with prior art, the beneficial effects of the present invention are:
One, compared with existing peak value comparison method single-inductance double-output switch converters, single inductance lose-lose of the invention
For switch converters when load changes, the control pulse of the quick regulating switch pipe of energy, output voltage overshoot is small, adjusts out
Time is short, the load transient better performances of converter.
Two, compared with existing peak value comparison method single-inductance double-output switch converters, single-inductance double-output of the invention
Switch converters can effectively reduce the cross influence between output branch when output branch circuit load changes, and system is stablized
Property is good.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention.
Fig. 2 is the circuit structure block diagram when present invention uses Buck converter.
Fig. 3 is the waveform diagram that the inductive current used when Buck converter and switching device of the invention control pulse.
Fig. 4 is the control sequential figure of control device of the present invention.
Fig. 5 is the present invention and peak value comparison method single-inductance double-output switch converters respectively in output branch a and b load
Transient state time-domain-simulation waveform when variation.Wherein, Fig. 5 a is that peak value comparison method single-inductance double-output switch converters are exporting
Transient response waveform when branch a load variation, Fig. 5 b are transient response wave of the present invention when exporting branch a load variation
Shape；Fig. 5 c is transient response wave of the peak value comparison method single-inductance double-output switch converters when exporting branch b load variation
Shape, Fig. 5 d are transient response waveform of the present invention when exporting branch b load variation.
Specific embodiment
Capacitance current ripple control, basic thought are: control circuit equally includes outer voltage and current inner loop, voltage
The output voltage that outer ring will test is compared with reference voltage, the conduct after error amplifier compensates of obtained error signal
The reference current of current inner loop, current inner loop detection capacitance current are simultaneously compared with reference current, and comparison result is used to control
The shutdown of switching tube；The conducting of clock signal control switch pipe.Capacitance current can directly reflect the variation of load current, when negative
When carrying curent change, control circuit can be adjusted quickly, therefore capacitance current ripple control single-inductor dual-output converter has
Output cross influences small, the good advantage of load transient performance.
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in Figure 1, a kind of specific embodiment of the invention are as follows: single-inductance double-output switch converters capacitance current line
Wave control method and its device, by converter TD and switching tube S1、S2Control device composition.Its control device is mainly by capacitor
Current ripples controller CTR1And CTR2Composition.Capacitance current ripple control device CTR1By voltage detecting circuit VS1, capacitance current
Detection circuit IS1, capacitance current detection circuit IS2, adder ADD, reference voltage Vref1, error amplifier EAP1, comparator
CMP1, rest-set flip-flop TGR1, driving circuit DR1, clock signal clk composition；Capacitance current ripple control device CTR2By voltage detecting
Circuit VS2, capacitance current detection circuit IS1, capacitance current detection circuit IS2, adder ADD, reference voltage Vref2, error puts
Big device EAP2, comparator CMP2, rest-set flip-flop TGR2, driving circuit DR2, clock signal clk composition.Wherein, voltage detecting circuit
VS1、VS2It is respectively used to obtain output voltage Voa、Vob, capacitance current detection circuit IS1、IS2It is respectively used to obtain capacitance current
Ic1、Ic2, adder ADD is for obtaining total capacitance current, error amplifier EAP1、EAP2It is respectively used to obtain reference current
Vc1、Vc2, comparator CMP1、CMP2It is respectively used to obtain rest-set flip-flop TGR1、TGR2The end R input signal, clock signal clk make
For rest-set flip-flop TGR1、TGR2The end S input signal, rest-set flip-flop TGR1、TGR2The end Q output signal for obtaining switching tube S1
And S2Control signal, via driving circuit DR1、DR2The conducting and shutdown of control switch converter TD switching tube.
The converter TD of this example is Buck converter, and working process and principle are:
Control device is using the working process and principle of capacitance current ripple control: Fig. 2 shows in any a cycle
Initial time, clock signal clk make rest-set flip-flop TGR1、TGR2Set, rest-set flip-flop TGR1、TGR2Q end signal pass through driving
Circuit DR1、DR2Main switch S is controlled respectively1With branch switch pipe S2Conducting.Control circuit sampling and outputting voltage VoaAnd capacitor
Electric current Ic1、Ic2；Output voltage VoaWith reference voltage Vref1Comparison result pass through error amplifier EAP1After obtain reference current
Vc1；Capacitance current Ic1、Ic2Total capacitance current I is obtained by adder ADDc；IcWith Vc1Pass through comparator CMP1Compare to obtain
Rest-set flip-flop TGR1The end R input signal, generate branch switch pipe S1Cut-off signals be connected to driving circuit DR1Input terminal,
DR1Output end be connected to branch switch pipe S1Gate pole control terminal, control switch pipe S1Shutdown.Control circuit sampling output
Voltage VobWith capacitance current Ic1、Ic2；Output voltage VobWith reference voltage Vref2Comparison result pass through error amplifier EAP2Afterwards
Obtain reference current Vc2；Capacitance current Ic1、Ic2Total capacitance current I is obtained by adder ADDc；IcWith Vc2Pass through comparator
CMP2Compare to obtain rest-set flip-flop TGR2The end R input signal, generate main switch S2Cut-off signals be connected to driving circuit
DR2Input terminal, DR2Output end be connected to main switch S2Gate pole control terminal, control switch pipe S2Shutdown.
Fig. 3 show the working sequence and inductive current waveform diagram that Fig. 2 circuit works in continuous current mode conduction mode.
In d1TsIn time, S1And S2Conducting, D1And D2Shutdown, inductive current is by output branch a with charging ramp (Vin-VoaOn)/L
It rises.In (d2-d1)TsIn time, S2And D2Conducting, S1And D1Shutdown, inductive current is by output branch b with charging ramp (Vin-
Vob)/L continues to rise.In (1-d2)TsIn time, D1And D2Conducting, S1And S2Shutdown, inductive current is by output branch b to put
Electric slope-Vob/ L decline, until circuit enters next switch periods.
Fig. 4 show the control sequential figure of control device.In the initial time of each switch periods, clock signal clk makes
Trigger RS-trigger1, RS-trigger2 set controls signal d1、d2For high level, switching tube S1、S2Conducting, diode
D2Shutdown；Capacitance current ICLinear rise.As capacitance current ICRise to error voltage Vc1When, control signal d1For low level, open
Close pipe S1Shutdown, diode D2Conducting, switching tube S2It is held on, capacitance current ICContinue linear rise.As capacitance current ICOn
Rise to error voltage Vc2When, control signal d2For low level, switching tube S2Shutdown, switching tube S1It is held off, diode D2It keeps
Conducting, capacitance current ICLinear decline.
Time-domain-simulation analysis is carried out to method of the invention with PSIM simulation software, it is as a result as follows.
Fig. 5 is to be implemented on single-inductance double-output Buck converter using peak value comparison method and the present invention to bear in output branch
The time-domain-simulation waveform diagram of output voltage and output electric current when carrying mutation, Fig. 5 a, Fig. 5 b respectively correspond peak value comparison method and electricity
Capacitance current ripple control single-inductance double-output Buck converter export branch a load variation when output voltage and output electric current when
Domain simulation waveform, Fig. 5 c, Fig. 5 d respectively correspond peak value comparison method and capacitance current ripple control single-inductance double-output Buck becomes
The time-domain-simulation waveform of output voltage and output electric current when parallel operation exports branch b load variation.In Fig. 5 a, Fig. 5 b, peak point current
It controls single-inductance double-output Buck converter and capacitance current ripple control single-inductance double-output Buck converter exports branch a's
Export electric current IoaFrom 60mA mutation to 90mA, the output electric current I of branch b is exportedobWhen for 3.3A, peak value comparison method list inductance
The output voltage V of dual output Buck converter output branch aoaEnter new stable state after about 3ms, overshoot 80mV is defeated
Out branch a is 100mV to the cross influence of output branch b；And use capacitance current ripple control list inductance lose-lose of the invention
It is about 2ms, overshoot 40mV that Buck switch converters, which enter the adjustment time of new stable state, out, and output branch a is to output branch
The cross influence very little of road b.In Fig. 5 c, Fig. 5 d, peak value comparison method single-inductance double-output Buck converter and capacitance current line
Wave controls the output electric current I of single-inductance double-output Buck converter output branch bobFrom 3.3A mutation to 3.6A, export branch b's
Export electric current IobWhen for 60mA, peak value comparison method single-inductance double-output Buck converter exports the output voltage V of branch aoaThrough
Enter new stable state after crossing about 3ms, overshoot 90mV, output branch b are 50mV to the cross influence of output branch a；And it adopts
Just entered with capacitance current ripple control single-inductance double-output Buck converter of the invention almost without adjustment process new steady
State, output branch b are minimum to the cross influence of output branch a.It can be seen that switch converters output voltage transient state overshoot of the invention
Measure small, regulating time is short, and load transient performance is good, and the cross influence exported between branch is small.The simulated conditions of Fig. 4 are input electricity
Press Vin=10V, voltage reference value Vref1=1.8V, Vref2=3.3V, inductance L=100 μ H, capacitor C1=470 μ F, C2=220 μ
F, load resistance Ra=3 Ω, Rb=1 Ω.
In the present invention, converter TD may be Boost, One Buck-Boost converter body or Bipolar converter.
Claims (3)
1. single-inductance double-output switch converters capacitance current ripple control method, which is characterized in that
Capacitance current ripple control device CTR1Detect the single-inductance double-output switch converters output voltage Voa, and pass through detection
Circuit detects capacitance current Ic1With capacitance current Ic2, generate control pulse Vgs1, to control single-inductance double-output switch change-over
Branch switch pipe S in device1Conducting and shutdown；
Capacitance current ripple control device CTR2Detect the single-inductance double-output switch converters output voltage Vob, and pass through detection
Circuit detects capacitance current Ic1With capacitance current Ic2, generate control pulse Vgs2, to control single-inductance double-output switch change-over
Main switch S in device2Conducting and shutdown；
The control pulse Vgs1Generation method are as follows: output voltage VoaWith voltage reference value Vref1By error amplifier EAP1
Generate the error signal V of amplificationc1It is sent into comparator CMP1Negative input end, capacitance current Ic1With capacitance current Ic2By addition
Device ADD obtains total capacitance current IcIt is sent into comparator CMP1Positive input terminal；IcAnd Vc1Comparison result be sent into rest-set flip-flop
TGR1The end R, controlling brancher switching tube S1Shutdown；Clock signal clk is sent into rest-set flip-flop TGR1The end S, controlling brancher switch
Pipe S1Conducting；
The control pulse Vgs2Generation method are as follows: output voltage VobWith voltage reference value Vref2By error amplifier EAP2
Generate the error signal V of amplificationc2It is sent into comparator CMP2Negative input end, capacitance current Ic1With capacitance current Ic2By addition
Device ADD obtains total capacitance current IcIt is sent into comparator CMP2Positive input terminal；IcAnd Vc2Comparison result be sent into rest-set flip-flop
TGR2The end R, control main switch S2Shutdown；Clock signal clk is sent into rest-set flip-flop TGR2The end S, control main switch S2
Conducting.
2. single-inductance double-output switch converters capacitance current ripple control device, it is characterised in that: including capacitance current ripple
Controller CTR1, capacitance current ripple control device CTR2And detection circuit；
The capacitance current ripple control device CTR1Including the voltage detecting circuit VS being sequentially connected1, error amplifier EAP1, ratio
Compared with device CMP1, rest-set flip-flop TGR1With driving circuit DR1；EAP1It is also connected with reference voltage Vref1, TGR1It is also connected with clock signal
CLK；
The capacitance current ripple control device CTR2Including the voltage detecting circuit VS being sequentially connected2, error amplifier EAP2, ratio
Compared with device CMP2, rest-set flip-flop TGR2With driving circuit DR2；EAP2It is also connected with reference voltage Vref2, TGR2It is also connected with clock signal
CLK；
The detection circuit includes capacitance current detection circuit IS1, capacitance current detection circuit IS2With adder ADD, IS1And IS2
It is connected respectively to ADD, ADD is also respectively connected to CMP1And CMP2；
The VS1、VS2、IS1、IS2、DR1And DR2It is connected respectively to the single-inductance double-output switch converters.
3. device as claimed in claim 2, which is characterized in that the single-inductance double-output switch converters are Buck transformation
Device, Boost, One Buck-Boost converter body or Bipolar converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711216136.6A CN107769532B (en) | 2017-11-28 | 2017-11-28 | Single-inductance double-output switch converters capacitance current ripple control method and device |
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| CN201711216136.6A CN107769532B (en) | 2017-11-28 | 2017-11-28 | Single-inductance double-output switch converters capacitance current ripple control method and device |
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| CN107769532B true CN107769532B (en) | 2019-11-29 |
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| CN110661422A (en) * | 2019-10-26 | 2020-01-07 | 西南民族大学 | Ripple control method and device for single-inductor double-output switching converter |
| CN111740714A (en) * | 2020-07-27 | 2020-10-02 | 张金路 | Filter capacitor current feedback self-oscillation audio digital power amplifier |
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| CN103475216B (en) * | 2013-09-05 | 2016-05-11 | 成都芯源***有限公司 | Power converter, clock module, control circuit and related control method |
| CN103618455B (en) * | 2013-12-10 | 2016-02-03 | 东南大学 | Reduce method and circuit thereof that single inductance dual-output converter exports steady-state error |
| CN104638913B (en) * | 2015-02-27 | 2017-03-01 | 西南交通大学 | Single-inductance double-output switch converters bicyclic voltage-type PFM control and its device |
| CN106300964B (en) * | 2016-08-24 | 2018-08-17 | 西南交通大学 | Independent charge and discharge sequential single-inductance double-output switch converters method for controlling frequency conversion and its device |
| CN106208684B (en) * | 2016-08-24 | 2018-07-31 | 西南交通大学 | A kind of combined control method of single-inductance double-output switch converters and its device |
| CN106253666B (en) * | 2016-08-25 | 2018-07-06 | 西南交通大学 | Single-inductance double-output switch converters method for controlling frequency conversion and its control device |
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