CN111181397A - Three-mode control method of four-switch buck-boost converter - Google Patents
Three-mode control method of four-switch buck-boost converter Download PDFInfo
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- CN111181397A CN111181397A CN202010037550.6A CN202010037550A CN111181397A CN 111181397 A CN111181397 A CN 111181397A CN 202010037550 A CN202010037550 A CN 202010037550A CN 111181397 A CN111181397 A CN 111181397A
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- 230000007704 transition Effects 0.000 claims abstract description 22
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- 230000000295 complement effect Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 description 3
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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
- H02M3/145—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a three-mode control method of a four-switch buck-boost converter, which adopts a three-mode control method, direct-current voltage outer-loop control and four-switch buck-boost converter output voltage V when the input voltage and the output voltage are close in amplitude and the voltage conversion ratio is discontinuous and enters a transition regionoWith output voltage given reference value VrefThe voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal dctr,dctrThe PWM waveform corresponding to the switching tube is adjusted for determining the three-mode selection, and the three-mode selection comprises the following steps: a transient buck mode, a transient boost mode, a boost mode. The problem of 'transition zone' of the four-switch converter is solved, and smooth transition between different modes is realized. The four-switch converter has improved stability, and ensures the whole-course stability of the converter in work.
Description
Technical Field
The invention relates to a converter control technology, in particular to a three-mode control method of a four-switch buck-boost converter.
Background
The four-switch buck-boost converter can realize the boosting and the reducing operations of the input voltage and output the same-phase voltage. When the input voltage is higher than the output voltage, the converter operates in a buck mode; when the input voltage is lower than the output voltage, the converter operates in a boost mode, which is a two-mode control strategy. However, the duty ratio is limited due to factors such as switching delay and dead time, and when the amplitude of the input voltage is close to that of the output voltage, the voltage conversion ratio is discontinuous. This region of discontinuous switching ratio near the output voltage is called the "transition region", and the presence of the transition region affects the stability of the converter, so a multi-mode control is needed to solve the problem of the "transition region".
Disclosure of Invention
The invention provides a three-mode control method of a four-switch buck-boost converter aiming at the problem of unstable conversion of a transition region of the four-switch buck-boost converter, which can solve the problem of the transition region of the four-switch converter and realize smooth transition among different modes.
The technical scheme of the invention is as follows: a three-mode control method of a four-switch buck-boost converter adopts a three-mode control method when the voltage conversion ratio is discontinuous and enters a transition region when the amplitude of an input voltage is close to that of an output voltage, and comprises the following specific steps:
direct-current voltage outer loop control, four-switch buck-boost converter output voltage VoWith output voltage given reference value VrefThe voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal dctr,dctrThe PWM waveform corresponding to the switching tube is adjusted for determining the three-mode selection, and the three-mode selection comprises the following steps: in a transition depressurization mode, a working point P belongs to DF; in a transition boosting mode, a working point P belongs to CD; in the boosting mode, a working point P belongs to AB; point A position (d)2min1), position of point B (d)2max1), point C position (d)1max*d2max,d1max) Point D position (D)2max,d1max) Point F position (d)2max,d1min) And d is2max=d1max=dmaxSwitching tube Q1And Q4Are respectively d1、1-d1As a pair of complementary duty cycle switching tubes, wherein d1min、d1maxAre respectively a switching tube Q1Minimum and maximum duty cycles of; switch tube Q2And Q3Respectively duty ratio ofIs d2、1-d2As a pair of complementary duty cycle switching tubes, wherein d2min、d2maxAre respectively a switching tube Q2Minimum and maximum duty cycles of; the three-mode control is performed according to the following formula,
dctra transition depressurization mode is not more than 0.5; 0.5<dctrl<0.5/d2maxA transition boosting mode is adopted; formula dctrl≥0.5/d2maxThe boost mode is used.
The invention has the beneficial effects that: according to the three-mode control method of the four-switch buck-boost converter, the stability of the four-switch converter is improved, and the stability of the converter in the whole working process is ensured.
Drawings
FIG. 1 is a block diagram of a four-switch buck-boost converter;
FIG. 2 is a logic diagram of the four-switch buck-boost converter control of the present invention;
FIG. 3 is a schematic diagram of the four-switch three-mode control of the present invention;
FIG. 4 is a graph showing the experimental effect of the present invention under the three-mode control.
Detailed Description
The four-switch buck-boost converter structure is shown in figure 1, VinIs the converter input voltage, VoIs the converter output voltage with a load of R, Q1~Q4Is a switch tube, a switch tube Q1And Q4Are respectively d1、1-d1As a pair of switching tubes with complementary duty cycles; switch tube Q2And Q3Are respectively d2、1-d2As a pair of switch tubes with complementary duty cycles.
By controlling Q1~Q4The charging and discharging of the inductor L are realized, and energy is transferred to the load R. In particular, the switching tube Q1And Q3Turning on, and storing energy by the inductor L; switch tube Q2And Q4Turn on, inductance L is negativeEnergy is supplied by the carrier R; switch tube Q1And Q2On, the inductive state being dependent on the input voltage VinAn output voltage V0Size.
The control logic of the present invention is shown in FIG. 2, and the DC voltage outer loop controls the converter output voltage VoWith output voltage given reference value VrefThe voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal dctr,dctrFor determining the operating mode of a four-switch converter, the mode selection module is dependent on dctrRespectively output the switch tube Q1、Q4Duty ratio d of1、d2And adjusting the corresponding PWM waveform of the switching tube.
The three-mode control strategy of the invention is respectively a transition voltage reduction mode (working point P belongs to DF), a transition voltage increase mode (working point P belongs to CD) and a voltage increase mode (working point P belongs to AB) as shown in figure 3.
Under three modes, the formula of the mode selection module in FIG. 2 is guided: as can be seen from FIG. 3, the position of point A (d)2min1), position of point B (d)2max1), point C position (d)1max*d2max,d1max) Point D position (D)2max,d1max) Point F position (d)2max,d1min) And d is2max=d1max=dmaxIs obtained by
Transient depressurization mode according to formula (1) dctrlLess than or equal to 0.5, switch tube Q2Constant duty ratio of d2maxRegulating Q1Duty ratio d of1。
Transition boost mode according to equation (1)0.5<dctrl<0.5/d2maxSwitching tube Q1Constant duty cycle of d1maxRegulating the switching tube Q2Duty ratio of d2。
A boosting mode: according to the formula (1) dctrl≥0.5/d2maxSwitching tube Q1Constant conduction (duty cycle d11), openClosing tube Q2Duty ratio of d2。
Applying a three-mode control strategy, the voltage conversion ratio at points B and C is equal, i.e. MC=MBThis causes the four-switch converter to switch in mode, with the same input voltage VinLower, output voltage VoInvariable (V)o-B=Vo-C) Therefore, the four-switch converter stability is improved.
As shown in fig. 4, at an input voltage VinUnder the condition of a certain 32V, the output voltage is changed to set a reference value VrefThe output voltage V can be realized when the voltage is respectively 33V, 30V and 26V0The voltage was varied in the order of 33V, 30V and 26V. The converter can still realize the output voltage V0The method is continuous and stable, and the converter stably runs in the whole process.
Claims (1)
1. A three-mode control method of a four-switch buck-boost converter is characterized in that when an input voltage and an output voltage are close in amplitude, a three-mode control method is adopted when a voltage conversion ratio is discontinuous and enters a transition region, and the method specifically comprises the following steps:
direct-current voltage outer loop control, four-switch buck-boost converter output voltage VoWith output voltage given reference value VrefThe voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal dctr,dctrThe PWM waveform corresponding to the switching tube is adjusted for determining the three-mode selection, and the three-mode selection comprises the following steps: in a transition depressurization mode, a working point P belongs to DF; in a transition boosting mode, a working point P belongs to CD; in the boosting mode, a working point P belongs to AB; point A position (d)2min1), position of point B (d)2max1), point C position (d)1max*d2max,d1max) Point D position (D)2max,d1max) Point F position (d)2max,d1min) And d is2max=d1max=dmax,
Switch tube Q1And Q4Are respectively d1、1-d1As a pair of complementary duty cycle switching tubes, wherein d1min、d1maxAre respectively a switching tube Q1Minimum and maximum duty cycles of; switch tube Q2And Q3Are respectively d2、1-d2As a pair of complementary duty cycle switching tubes, wherein d2min、d2maxAre respectively a switching tube Q2Minimum and maximum duty cycles of; the three-mode control is performed according to the following formula,
dctra transition depressurization mode is not more than 0.5; 0.5<dctrl<0.5/d2maxA transition boosting mode is adopted; formula dctrl≥0.5/d2maxThe boost mode is used.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113328626A (en) * | 2021-04-29 | 2021-08-31 | 武汉麦格米特电气有限公司 | Control method and controller of four-switch Buck-Boost converter and power supply equipment |
CN113364291A (en) * | 2021-05-06 | 2021-09-07 | 深圳第三代半导体研究院 | Two-mode control method and system for bidirectional reversible direct current converter |
WO2023273300A1 (en) * | 2021-06-30 | 2023-01-05 | 易事特集团股份有限公司 | Method and system for smoothly switching modes of buck-boost circuit |
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CN113364291A (en) * | 2021-05-06 | 2021-09-07 | 深圳第三代半导体研究院 | Two-mode control method and system for bidirectional reversible direct current converter |
WO2023273300A1 (en) * | 2021-06-30 | 2023-01-05 | 易事特集团股份有限公司 | Method and system for smoothly switching modes of buck-boost circuit |
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