CN101997411A - Control circuit and method of buck-boost power converter - Google Patents
Control circuit and method of buck-boost power converter Download PDFInfo
- Publication number
- CN101997411A CN101997411A CN2009101706891A CN200910170689A CN101997411A CN 101997411 A CN101997411 A CN 101997411A CN 2009101706891 A CN2009101706891 A CN 2009101706891A CN 200910170689 A CN200910170689 A CN 200910170689A CN 101997411 A CN101997411 A CN 101997411A
- Authority
- CN
- China
- Prior art keywords
- signal
- voltage
- frequency
- variable voltage
- sawtooth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit of a buck-boost power converter, which is used for generating a control signal for manipulating a buck-boost power level and also used for converting an input voltage into an output voltage, and is characterized by comprising a feedback circuit, an error amplifier, a waveform generator, a frequency controller, a frequency generator, a pulse width modulation comparator and a gate driver. The control circuit and control method of the buck-boost power converter have the advantages of improving the stability of the buck-boost power converter, reducing the switching loss of the buck-boost power level and improving the efficiency of the buck-boost power converter.
Description
Technical field
The present invention relates to a kind of step-down/up type power supply changeover device, specifically, is a kind of control circuit and method of step-down/up type power supply changeover device.
Background technology
The buck power supply changeover device is the buck power stage 10 of operating as shown in Figure 1, and the input voltage vin step-down is become output voltage V o offered load Rload.The boost type power supply changeover device is the boost type power stage 12 of operating as shown in Figure 2, becomes output voltage V o offered load Rload and input voltage vin boosted.Because battery can't provide stable voltage always, therefore, with the system of battery as input power supply Vin, for example portable apparatus can't use buck power supply changeover device or boost type power supply changeover device that stable voltage is provided.
Owing to the voltage of battery can descend along with the consumption of electric energy, therefore, need the power supply changeover device that can between buck and boost type, switch as the system of input power supply with battery.The step-down/up type power supply changeover device is the step-down/up type power stage 14 of operating as shown in Figure 3, and the input voltage vin buck or boost is become output voltage V o offered load Rload.Yet the output voltage V o of this step-down/up type power supply changeover device is a negative voltage, is not suitable for some and uses, and therefore step-down/up type power stage 16 has as shown in Figure 4 been arranged, and it can become the input voltage vin buck or boost output voltage V o of positive voltage.The control circuit of at present existing many operation step-down/up type power stages 16 and method propose, and for example U.S. Patent number 6,166, and 527 and 7,518,346, however they still can't satisfy user's demand.
Therefore the control circuit and the method for known step-down/up type power supply changeover device exist above-mentioned all inconvenience and problem.
Summary of the invention
Purpose of the present invention is to propose a kind of control circuit and method of step-down/up type power supply changeover device.
For achieving the above object, technical solution of the present invention is:
A kind of control circuit of step-down/up type power supply changeover device is converted to output voltage in order to produce control signal operation step-down/up type power stage with input voltage, it is characterized in that described control circuit comprises:
Feedback circuit detects described output voltage and produces feedback signal, and described feedback signal is the function of described output voltage;
Error amplifier connects described feedback circuit, amplifies the difference between described feedback signal and the reference voltage and produces error signal;
Waveform generator provides first sawtooth signal and second sawtooth signal;
Frequency controller connects described error amplifier, produces oscillator signal according to described error signal;
Frequency generator connects described frequency controller and described waveform generator, produces frequency signal according to described oscillator signal and gives described waveform generator, to control the frequency of described first and second sawtooth signal;
The pulse-width modulation comparator connects described error amplifier and described waveform generator, produces the first pulse-width modulation signal and the second pulse-width modulation signal according to described error signal and described first and second sawtooth signal; And
Gate pole driver connects described pulse-width modulation comparator and described step-down/up type power stage, produces described control signal according to described first and second pulse-width modulation signal.
The control circuit of step-down/up type power supply changeover device of the present invention can also be further achieved by the following technical measures.
Aforesaid control circuit, wherein said first and second sawtooth signal has nonlinear waveform.
Aforesaid control circuit, wherein said waveform generator is according to the peak value and the valley of signal change described first and second sawtooth signal relevant with described input voltage and described output voltage.
Aforesaid control circuit, wherein said waveform generator comprises:
First variable voltage source is supplied first variable voltage;
Second variable voltage source is supplied second variable voltage;
Electric capacity is connected between described first and second variable voltage source;
The resistance and first switch series are associated between described first variable voltage source and the described electric capacity, and described first switch makes described first variable voltage source charge to described electric capacity in response to first unblanking;
Second switch, in parallel with described electric capacity, make described capacitor discharge in response to the secondary signal unlatching;
The 3rd variable voltage source provides the 3rd variable voltage;
Comparator connects described electric capacity and described the 3rd variable voltage source, more described first sawtooth signal and described the 3rd variable voltage and produce comparison signal;
Flip-flop connects described comparator and described frequency generator, produces described first and second signal according to described frequency signal and described comparison signal; And
The translation circuit connects described first, second and third variable voltage source, adjusts described first, second and third variable voltage according to described input and output voltage, thereby controls the peak value and the valley of described first sawtooth signal.
Aforesaid control circuit comprises more that wherein second resistance connects with described second switch, to control described capacitance discharges speed.
Aforesaid control circuit, wherein said waveform generator comprises:
First variable voltage source is supplied first variable voltage;
Second variable voltage source is supplied second variable voltage;
Electric capacity is connected between described first and second variable voltage source;
The resistance and first switch series are associated between described first variable voltage source and the described electric capacity, and described first switch makes described first variable voltage source charge to described electric capacity in response to first unblanking;
Second switch, in parallel with described electric capacity, make described capacitor discharge in response to the secondary signal unlatching;
The 3rd variable voltage source provides the 3rd variable voltage;
Comparator connects described electric capacity and described the 3rd variable voltage source, more described second sawtooth signal and described the 3rd variable voltage and produce comparison signal;
Flip-flop connects described comparator and described frequency generator, produces described first and second signal according to described frequency signal and described comparison signal; And
The translation circuit connects described first, second and third variable voltage source, adjusts described first, second and third variable voltage according to described input and output voltage, thereby controls the peak value and the valley of described second sawtooth signal.
Aforesaid control circuit comprises more that wherein second resistance connects with described second switch, to control described capacitance discharges speed.
Aforesaid control circuit, wherein said frequency controller comprises that voltage controlled oscillator connects described error amplifier and described frequency generator, produce described oscillator signal according to described error signal and offer described frequency generator, the frequency of described oscillator signal rises or descends with described error signal and increases or reduce.
Aforesaid control circuit, wherein said frequency controller comprises:
Voltage controlled oscillator connects described frequency generator, in order to provide described oscillator signal to described frequency generator;
First switch is connected between described error amplifier and the voltage controlled oscillator;
First voltage source provides first voltage;
Comparator, connect described error amplifier and described first voltage source, more described error signal and described first voltage and produce comparison signal, open described first switch in described error signal during less than described first voltage, and make described voltage controlled oscillator produce described oscillator signal according to described error signal;
Second voltage source provides second voltage;
Second switch is connected between described second voltage source and the described voltage controlled oscillator; And
Inverter, be connected between described comparator and the described second switch, produce the inversion signal of described comparison signal, open described second switch in described error signal during greater than described first voltage, and make described voltage controlled oscillator produce described oscillator signal according to described second voltage.
Aforesaid control circuit, wherein said oscillator signal has frequency with described error signal change during less than described first voltage in described error signal.
Aforesaid control circuit, wherein said oscillator signal has fixing frequency during greater than described first voltage in described error signal.
A kind of control method of step-down/up type power supply changeover device is converted to output voltage in order to produce control signal operation step-down/up type power stage with input voltage, it is characterized in that described control method comprises the following steps:
(A) detect described output voltage and produce feedback signal, described feedback signal is the function of described output voltage;
(B) amplify the difference between described feedback signal and the reference voltage and produce error signal;
(C) produce oscillator signal according to described error signal;
(D) produce first sawtooth signal and second sawtooth signal according to described oscillator signal;
(E) produce the first pulse-width modulation signal and the second pulse-width modulation signal according to described error signal and described first and second sawtooth signal; And
(F) produce described control signal according to described first and second pulse-width modulation signal.
The control method of step-down/up type power supply changeover device of the present invention can also be further achieved by the following technical measures.
Aforesaid control method, wherein said step C comprises that the frequency that makes described oscillator signal rises with described error signal or decline increases or reduces.
Aforesaid control method, wherein said step C comprises:
Making during less than first voltage frequency of described oscillator signal rise or descend with described error signal in described error signal increases or reduces; And
Make described oscillator signal have fixing frequency in described error signal during greater than described first voltage.
Aforesaid control method, wherein said step D comprises makes described first and second sawtooth signal have nonlinear waveform.
Aforesaid control method, wherein said step D comprises:
Trigger first signal in response to described frequency signal;
In response to described first signal electric capacity is charged;
Take out described first sawtooth signal from described electric capacity;
More described first sawtooth signal and variable voltage and trigger secondary signal;
Make described capacitor discharge in response to described secondary signal; And
Control the peak value and the valley of described first sawtooth signal according to described input and output voltage.
Aforesaid control method wherein more comprises the described capacitance discharges speed of control.
Aforesaid control method, wherein said step D comprises:
Trigger first signal in response to described frequency signal;
In response to described first signal electric capacity is charged;
Take out described second sawtooth signal from described electric capacity;
More described second sawtooth signal and variable voltage and trigger secondary signal;
Make described capacitor discharge in response to described secondary signal; And
Control the peak value and the valley of described second sawtooth signal according to described input and output voltage.
Aforesaid control method wherein more comprises the described capacitance discharges speed of control.
Aforesaid control method wherein more comprises peak value and valley according to signal change described first and second sawtooth signal relevant with described input voltage and described output voltage.
After adopting technique scheme, the control circuit and the method for step-down/up type power supply changeover device of the present invention have the following advantages:
1. improve the stability of step-down/up type power supply changeover device.
2. reduce the switch cost of described step-down/up type power stage, improve the usefulness of described step-down/up type power supply changeover device.
Description of drawings
Fig. 1 is traditional buck power supply changeover device schematic diagram;
Fig. 2 is traditional boost type power supply changeover device schematic diagram;
Fig. 3 is traditional step-down/up type power supply changeover device schematic diagram;
Fig. 4 is another kind of traditional step-down/up type power supply changeover device schematic diagram;
Fig. 5 is the schematic diagram of embodiments of the invention;
Fig. 6 is the schematic diagram of first embodiment of waveform generator among Fig. 5;
Fig. 7 is that Fig. 6 medium frequency CLK is when deciding frequently, the oscillogram of frequency CLK and sawtooth signal Vramp1;
When Fig. 8 is frequency conversion for Fig. 6 medium frequency CLK, the oscillogram of frequency CLK and sawtooth signal Vramp1;
Fig. 9 is the schematic diagram of the embodiment of non-linear sawtooth signal Vramp1 waveform;
Figure 10 is the schematic diagram of the embodiment of non-linear sawtooth signal Vramp1 waveform;
Figure 11 is the schematic diagram of the embodiment of non-linear sawtooth signal Vramp1 waveform;
Figure 12 is the schematic diagram of second embodiment of waveform generator among Fig. 5;
Figure 13 is the schematic diagram of first embodiment of Fig. 5 medium frequency controller; And
Figure 14 is the schematic diagram of second embodiment of Fig. 5 medium frequency controller.
Among the figure, 10, buck power stage 12, boost type power stage 14, step-down/up type power stage 16, step-down/up type power stage 18, step-down/up type power supply changeover device 20, control circuit 22, feedback circuit 24, error amplifier 26, waveform generator 28, pulse-width modulation comparator 30, gate pole driver 32, frequency controller 34, frequency generator 36, comparator 38, SR flip-flop 40, translation circuit 42, voltage controlled oscillator 44, comparator 46, inverter.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof the present invention is illustrated further.
Now see also Fig. 5, Fig. 5 is the schematic diagram of embodiments of the invention.As shown in the figure, described step-down/up type power supply changeover device 18 comprises power switch Q1, Q2, Q3 and the Q4 that control circuit 20 provides signal S1, S2, S3 and S4 to drive step-down/up type power stage 16 respectively, so that the input voltage vin buck or boost is become output voltage V o.In control circuit 20, feedback circuit 22 detects output voltage V o and produces the feedback signal VFB relevant with output voltage V o, error amplifier 24 amplifies the difference between feedback signal VFB and the reference voltage Vref 1 and produces error signal Vc, waveform generator 26 provides sawtooth signal Vramp1 and Vramp2, pulse-width modulation comparator 28 is according to error signal Vc and sawtooth signal Vramp1 and Vramp2 generation pulse-width modulation signal PWM1 and PWM2, gate pole driver 30 produces signal S1 according to pulse-width modulation signal PWM1 and PWM2, S2, S3 and S4, frequency controller 32 produces oscillator signal Sf according to error signal Vc, and frequency generator 34 produces frequency CLK to the frequency of waveform generator 26 with decision sawtooth signal Vramp1 and Vramp2 according to oscillator signal Sf.The frequency of oscillator signal Sf is by error signal Vc decision, and the frequency of frequency CLK is with the frequency shift of oscillator signal Sf, so the frequency of sawtooth signal Vramp1 and Vramp2 is determined by error signal Vc.
Waveform generator 26 is made up of voltage source, resistance and electric capacity, utilizes input voltage vin and output voltage V o or other signal relevant with input voltage vin and output voltage V o to control peak value and the valley of sawtooth signal Vramp.Fig. 6 is first embodiment of waveform generator 26, resistance R 1 and switch Q5 are connected between variable voltage source Vref2 and the capacitor C, switch Q6 is in parallel with capacitor C, signal S5 and S6 control switch Q5 and Q6 respectively produce sawtooth signal Vramp1 so that capacitor C discharges and recharges, variable voltage source Vref3 is connected between capacitor C and the ground end GND, comparator 36 is sawtooth signal Vramp and voltage Vref4 and produce signal Sc relatively, SR flip-flop 38 produces signal S5 and S6 according to frequency CLK and signal Sc, translation circuit 40 is adjusted voltage Vref2 according to input voltage vin and output voltage V o, Vref3 and Vref4, thereby peak value and the valley of adjustment sawtooth signal Vramp.SR flip-flop 38 also can replace with D type flip-flop or other logical circuit.When input voltage vin during near output voltage V o, translation circuit 40 is heightened voltage Vref2 and Vref4 or is turned down voltage Vref3 with the peak value of heightening sawtooth signal Vramp1 or the valley of turning down sawtooth signal Vramp1, and then make sawtooth signal Vramp1 can have the pulse-width modulation signal PWM1 of suitable operating time (duty) with error signal Vc decision, improve the stability of step-down/up type power supply changeover device 18.In addition, the peak value of sawtooth signal Vramp1 and valley also can be heightened or turn down to translation circuit 40 simultaneously with translation sawtooth signal Vramp1, improves the stability of step-down/up type power supply changeover device 18.
When frequency CLK is fixed frequency, sawtooth signal Vramp1 as shown in Figure 7, when time t1, frequency CLK triggers the output S5 of SR flip-flop 38, thereby open (turn on) switch Q5 and voltage source V ref2 is charged to capacitor C, so sawtooth signal Vramp1 begins to rise; As sawtooth signal Vramp1 during greater than voltage Vref4, shown in time t2, therefore the output Sc replacement SR flip-flop 38 of comparator 36 closes (turn off) switch Q5, and opens switch Q6 and make capacitor C be discharged to the accurate position of voltage Vref3.In this embodiment, because frequency CLK is fixed frequency, so sawtooth signal Vramp1 is also for frequently fixed.
When frequency CLK is frequency conversion, sawtooth signal Vramp1 as shown in Figure 8, when time t3, frequency CLK triggers SR flip-flop 38, thereby switch Q5 opens and voltage source V ref2 is charged to capacitor C; At sawtooth signal Vramp1 during greater than voltage Vref4, comparator 36 replacement SR flip-flops 38 and off switch Q5, and open switch Q6 and make capacitor C be discharged to the accurate position of voltage Vref3.In this embodiment, because frequency CLK is frequency conversion, so sawtooth signal Vramp1 also is frequency conversion.
As shown in Figures 7 and 8, waveform generator 26 provides non-linear sawtooth signal Vramp1, compares with the linear saw-tooth wave signal, and it can make step-down/up type power supply changeover device 18 that preferable voltage adjustment and preferable transient response are arranged when heavy duty.Except Fig. 7 and waveform shown in Figure 8, waveform generator 26 also can use different circuit and method that the non-linear sawtooth signal Vramp1 of other waveform, for example Fig. 9, Figure 10 and shown in Figure 11 are provided.Figure 12 is second embodiment of waveform generator 26, and in order to the sawtooth signal Vramp1 of Figure 10 to be provided, it increases resistance R 2 tandem tap Q6 in the waveform generator 26 of Fig. 6.Because the relation of resistance R 2, when capacitor C is discharged, sawtooth signal Vramp1 will reduce to the accurate position of voltage Vref3 at leisure, shown in the waveform of Figure 10.
The circuit that produces sawtooth signal Vramp2 is identical with the circuit that produces sawtooth signal Vramp1, so repeat no more.As sawtooth signal Vramp1, the frequency of sawtooth signal Vramp2 can be decides frequency or frequency conversion, and its waveform also can be non-linear.
Figure 13 is first embodiment of frequency controller 32, comprises voltage controlled oscillator (Voltage-Controlled Oscillator; VCO) 42 according to error signal Vc generation oscillator signal Sf, and the frequency of oscillator signal Sf increases or reduces with rising or the decline of error signal Vc.When heavy duty, error signal Vc is bigger, so VCO 110 will provide frequency higher oscillator signal Sf, and opposite, when underloading, error signal Vc is less, so VCO 110 will provide frequency lower oscillator signal Sf.Because the frequency of sawtooth signal Vramp1 and Vramp2 is lower when underloading, so the frequency of pulse-width modulation signal PWM1 and PWM2 also and then reduces, therefore reduce the switch cost of step-down/up type power stage 16, improve the usefulness of step-down/up type power supply changeover device 18.
Figure 14 is second embodiment of frequency controller 32, except VCO 42, comprise also that switch SW 1 is connected between VCO 42 and the error amplifier 24, comparator 44 comparison error signal Vc and voltage Vref5 produce comparison signal Scomp diverter switch SW1, switch SW 2 is connected VCO 42 and decide between the voltage source V ref6 and inverter 46 comparison signal Scomp is anti-phase with diverter switch SW2.When heavy duty, error signal Vc is higher than voltage Vref5, so switch SW 1 closes and switch SW 2 is opened, and this moment, VCO 42 will be according to decide the oscillator signal Sf that voltage Vref6 produces fixed frequency.When becoming underloading, error signal Vc descends, and during less than voltage Vref5, comparator 44 is opened switch SW 1 and off switch SW2, so VCO 42 will produce the oscillator signal Sf of frequency conversion according to error signal Vc at error signal Vc.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (20)
1. the control circuit of a step-down/up type power supply changeover device is converted to output voltage in order to produce control signal operation step-down/up type power stage with input voltage, it is characterized in that described control circuit comprises:
Feedback circuit detects described output voltage and produces feedback signal, and described feedback signal is the function of described output voltage;
Error amplifier connects described feedback circuit, amplifies the difference between described feedback signal and the reference voltage and produces error signal;
Waveform generator provides first sawtooth signal and second sawtooth signal;
Frequency controller connects described error amplifier, produces oscillator signal according to described error signal;
Frequency generator connects described frequency controller and described waveform generator, produces frequency signal according to described oscillator signal and gives described waveform generator, to control the frequency of described first and second sawtooth signal;
The pulse-width modulation comparator connects described error amplifier and described waveform generator, produces the first pulse-width modulation signal and the second pulse-width modulation signal according to described error signal and described first and second sawtooth signal; And
Gate pole driver connects described pulse-width modulation comparator and described step-down/up type power stage, produces described control signal according to described first and second pulse-width modulation signal.
2. control circuit as claimed in claim 1 is characterized in that, described first and second sawtooth signal has nonlinear waveform.
3. control circuit as claimed in claim 1 is characterized in that, described waveform generator is according to the peak value and the valley of signal change described first and second sawtooth signal relevant with described input voltage and described output voltage.
4. control circuit as claimed in claim 1 is characterized in that, described waveform generator comprises:
First variable voltage source is supplied first variable voltage;
Second variable voltage source is supplied second variable voltage;
Electric capacity is connected between described first and second variable voltage source;
The resistance and first switch series are associated between described first variable voltage source and the described electric capacity, and described first switch makes described first variable voltage source charge to described electric capacity in response to first unblanking;
Second switch, in parallel with described electric capacity, make described capacitor discharge in response to the secondary signal unlatching;
The 3rd variable voltage source provides the 3rd variable voltage;
Comparator connects described electric capacity and described the 3rd variable voltage source, more described first sawtooth signal and described the 3rd variable voltage and produce comparison signal;
Flip-flop connects described comparator and described frequency generator, produces described first and second signal according to described frequency signal and described comparison signal; And
The translation circuit connects described first, second and third variable voltage source, adjusts described first, second and third variable voltage according to described input and output voltage, thereby controls the peak value and the valley of described first sawtooth signal.
5. control circuit as claimed in claim 4 is characterized in that, comprises that more second resistance connects with described second switch, to control described capacitance discharges speed.
6. control circuit as claimed in claim 1 is characterized in that, described waveform generator comprises:
First variable voltage source is supplied first variable voltage;
Second variable voltage source is supplied second variable voltage;
Electric capacity is connected between described first and second variable voltage source;
The resistance and first switch series are associated between described first variable voltage source and the described electric capacity, and described first switch makes described first variable voltage source charge to described electric capacity in response to first unblanking;
Second switch, in parallel with described electric capacity, make described capacitor discharge in response to the secondary signal unlatching;
The 3rd variable voltage source provides the 3rd variable voltage;
Comparator connects described electric capacity and described the 3rd variable voltage source, more described second sawtooth signal and described the 3rd variable voltage and produce comparison signal;
Flip-flop connects described comparator and described frequency generator, produces described first and second signal according to described frequency signal and described comparison signal; And
The translation circuit connects described first, second and third variable voltage source, adjusts described first, second and third variable voltage according to described input and output voltage, thereby controls the peak value and the valley of described second sawtooth signal.
7. control circuit as claimed in claim 6 is characterized in that, comprises that more second resistance connects with described second switch, to control described capacitance discharges speed.
8. control circuit as claimed in claim 1, it is characterized in that, described frequency controller comprises that voltage controlled oscillator connects described error amplifier and described frequency generator, produce described oscillator signal according to described error signal and offer described frequency generator, the frequency of described oscillator signal rises or descends with described error signal and increases or reduce.
9. control circuit as claimed in claim 1 is characterized in that, described frequency controller comprises:
Voltage controlled oscillator connects described frequency generator, in order to provide described oscillator signal to described frequency generator;
First switch is connected between described error amplifier and the voltage controlled oscillator;
First voltage source provides first voltage;
Comparator, connect described error amplifier and described first voltage source, more described error signal and described first voltage and produce comparison signal, open described first switch in described error signal during less than described first voltage, and make described voltage controlled oscillator produce described oscillator signal according to described error signal;
Second voltage source provides second voltage;
Second switch is connected between described second voltage source and the described voltage controlled oscillator; And
Inverter, be connected between described comparator and the described second switch, produce the inversion signal of described comparison signal, open described second switch in described error signal during greater than described first voltage, and make described voltage controlled oscillator produce described oscillator signal according to described second voltage.
10. control circuit as claimed in claim 9 is characterized in that, described oscillator signal has frequency with described error signal change during less than described first voltage in described error signal.
11. control circuit as claimed in claim 9 is characterized in that, described oscillator signal has fixing frequency during greater than described first voltage in described error signal.
12. the control method of a step-down/up type power supply changeover device is converted to output voltage in order to produce control signal operation step-down/up type power stage with input voltage, it is characterized in that described control method comprises the following steps:
(A) detect described output voltage and produce feedback signal, described feedback signal is the function of described output voltage;
(B) amplify the difference between described feedback signal and the reference voltage and produce error signal;
(C) produce oscillator signal according to described error signal;
(D) produce first sawtooth signal and second sawtooth signal according to described oscillator signal;
(E) produce the first pulse-width modulation signal and the second pulse-width modulation signal according to described error signal and described first and second sawtooth signal; And
(F) produce described control signal according to described first and second pulse-width modulation signal.
13. control method as claimed in claim 12 is characterized in that, described step C comprises that the frequency that makes described oscillator signal rises with described error signal or decline increases or reduces.
14. control method as claimed in claim 12 is characterized in that, described step C comprises:
Making during less than first voltage frequency of described oscillator signal rise or descend with described error signal in described error signal increases or reduces; And
Make described oscillator signal have fixing frequency in described error signal during greater than described first voltage.
15. control method as claimed in claim 12 is characterized in that, described step D comprises makes described first and second sawtooth signal have nonlinear waveform.
16. control method as claimed in claim 12 is characterized in that, described step D comprises:
Trigger first signal in response to described frequency signal;
In response to described first signal electric capacity is charged;
Take out described first sawtooth signal from described electric capacity;
More described first sawtooth signal and variable voltage and trigger secondary signal;
Make described capacitor discharge in response to described secondary signal; And
Control the peak value and the valley of described first sawtooth signal according to described input and output voltage.
17. control method as claimed in claim 16 is characterized in that, more comprises the described capacitance discharges speed of control.
18. control method as claimed in claim 12 is characterized in that, described step D comprises:
Trigger first signal in response to described frequency signal;
In response to described first signal electric capacity is charged;
Take out described second sawtooth signal from described electric capacity;
More described second sawtooth signal and variable voltage and trigger secondary signal;
Make described capacitor discharge in response to described secondary signal; And
Control the peak value and the valley of described second sawtooth signal according to described input and output voltage.
19. control method as claimed in claim 18 is characterized in that, more comprises the described capacitance discharges speed of control.
20. control method as claimed in claim 12 is characterized in that, more comprises peak value and valley according to signal change described first and second sawtooth signal relevant with described input voltage and described output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910170689.1A CN101997411B (en) | 2009-08-28 | 2009-08-28 | Control circuit and method of buck-boost power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910170689.1A CN101997411B (en) | 2009-08-28 | 2009-08-28 | Control circuit and method of buck-boost power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101997411A true CN101997411A (en) | 2011-03-30 |
| CN101997411B CN101997411B (en) | 2015-04-08 |
Family
ID=43787148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910170689.1A Expired - Fee Related CN101997411B (en) | 2009-08-28 | 2009-08-28 | Control circuit and method of buck-boost power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101997411B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801307A (en) * | 2011-05-25 | 2012-11-28 | 纬创资通股份有限公司 | Power converter and control method thereof |
| CN102904440A (en) * | 2011-07-21 | 2013-01-30 | 英特赛尔美国股份有限公司 | Device and method for controlling a buck-boost converter |
| CN103683922A (en) * | 2013-12-17 | 2014-03-26 | 合肥工业大学 | Nonlinear control method of Buck-Boost converter system |
| CN104836434A (en) * | 2014-11-26 | 2015-08-12 | 杭州硅星科技有限公司 | Switch power supply and working method thereof |
| CN105634266A (en) * | 2016-03-18 | 2016-06-01 | 深圳市华星光电技术有限公司 | Control circuit for direct current-direct current converter |
| CN106059278A (en) * | 2016-05-31 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Frequency soft start control circuit |
| WO2016192303A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市中兴微电子技术有限公司 | Power supply control device and method for realizing composite output |
| CN110310686A (en) * | 2018-03-27 | 2019-10-08 | 华邦电子股份有限公司 | Memory component and its power control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6166527A (en) * | 2000-03-27 | 2000-12-26 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency in a buck-boost switching regulator |
| JP4054714B2 (en) * | 2003-04-28 | 2008-03-05 | 株式会社リコー | Buck-boost DC-DC converter |
-
2009
- 2009-08-28 CN CN200910170689.1A patent/CN101997411B/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801307A (en) * | 2011-05-25 | 2012-11-28 | 纬创资通股份有限公司 | Power converter and control method thereof |
| CN102904440A (en) * | 2011-07-21 | 2013-01-30 | 英特赛尔美国股份有限公司 | Device and method for controlling a buck-boost converter |
| CN102904440B (en) * | 2011-07-21 | 2014-09-03 | 英特赛尔美国股份有限公司 | Device and method for controlling a buck-boost converter |
| CN103683922A (en) * | 2013-12-17 | 2014-03-26 | 合肥工业大学 | Nonlinear control method of Buck-Boost converter system |
| CN103683922B (en) * | 2013-12-17 | 2016-05-11 | 合肥工业大学 | A kind of nonlinear control method of Buck-Boost changer system |
| CN104836434A (en) * | 2014-11-26 | 2015-08-12 | 杭州硅星科技有限公司 | Switch power supply and working method thereof |
| CN104836434B (en) * | 2014-11-26 | 2017-04-12 | 杭州硅星科技有限公司 | Switch power supply and working method thereof |
| CN106300969A (en) * | 2015-06-03 | 2017-01-04 | 深圳市中兴微电子技术有限公司 | A kind of power control realizing compound output and method |
| WO2016192303A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市中兴微电子技术有限公司 | Power supply control device and method for realizing composite output |
| CN105634266A (en) * | 2016-03-18 | 2016-06-01 | 深圳市华星光电技术有限公司 | Control circuit for direct current-direct current converter |
| CN105634266B (en) * | 2016-03-18 | 2018-05-29 | 深圳市华星光电技术有限公司 | The control circuit of DC-to-dc converter |
| US10177656B2 (en) | 2016-03-18 | 2019-01-08 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Control circuit for DC-DC converter that includes differential amplifier and oscillator to fast reach desired output voltage |
| CN106059278A (en) * | 2016-05-31 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Frequency soft start control circuit |
| CN106059278B (en) * | 2016-05-31 | 2018-08-21 | 中国电子科技集团公司第三十八研究所 | A kind of frequency SS (soft start) control circuit |
| CN110310686A (en) * | 2018-03-27 | 2019-10-08 | 华邦电子股份有限公司 | Memory component and its power control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101997411B (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101997411B (en) | Control circuit and method of buck-boost power converter | |
| KR101264558B1 (en) | Switching regulator and operation control method thereof | |
| CN100401627C (en) | DC-DC converting method and apparatus | |
| US7411316B2 (en) | Dual-input power converter and control methods thereof | |
| CN102594137B (en) | For the system and method for control switch formula power supply | |
| TWI587611B (en) | Dual-constant-time buck-boost switching regulator and control circuit and method thereof | |
| US7106130B2 (en) | Variable frequency PWM controller circuit | |
| CN101247083B (en) | Switching regulator | |
| CN103441658B (en) | A kind of Boost controller and Boost converter | |
| CN102055335B (en) | Buck-boost power converter and control method thereof | |
| CN100514813C (en) | DC-DC converter and dc-dc converter control method | |
| US8350539B2 (en) | Frequency modulation control of a buck-boost power converter | |
| CN101764514B (en) | Voltage converters and voltage generating methods | |
| US8581561B2 (en) | DC-DC boost converter circuit with an output stabilization circuit and method for driving the same | |
| TW201034363A (en) | Buck-boost power converter and its control method | |
| CN102055334B (en) | Control circuit and method for buck-boost power supply converter | |
| CN103051184A (en) | Boosted circuit | |
| CN106992679B (en) | Dual-fixed-time buck-boost switching type power circuit and control circuit and method thereof | |
| CN102163917B (en) | Step-up/step-down DC-DC converter and vehicle lighting appliance | |
| Lee et al. | Control of ZCS-SR inverter-fed voltage multiplier-based high-voltage DC–DC converter by digitally tuning tank capacitance and slightly varying pulse frequency | |
| CN105099188A (en) | Dc-dc converter | |
| JP2002233139A (en) | Dc-dc converter | |
| CN103683932B (en) | Electric pressure converter under PWM mode or pulse omission pattern and changing method | |
| CN110460237B (en) | Control method and device for PCCM Boost converter | |
| CN101674013B (en) | Switching voltage reduction power supply with improved mode conversion efficiency and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20150828 |
|
| EXPY | Termination of patent right or utility model |