CN111181397B - 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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- CN111181397B CN111181397B CN202010037550.6A CN202010037550A CN111181397B CN 111181397 B CN111181397 B CN 111181397B CN 202010037550 A CN202010037550 A CN 202010037550A CN 111181397 B CN111181397 B CN 111181397B
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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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Abstract
The invention relates to a three-mode control method of a four-switch buck-boost converter, which adopts the three-mode control method that when the amplitude of input voltage is close to that of output voltage, the voltage conversion ratio is discontinuous and enters a transition zone, the DC voltage is controlled by an outer loop, and the output voltage V of the four-switch buck-boost converter is controlled by an outer loop o With the output voltage giving a reference value V ref The voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal d ctr ，d ctr And the method is used for determining three-mode selection, adjusting the corresponding PWM waveform of the switching tube, and the three-mode selection comprises the following steps: a transient buck mode, a transient boost mode, a boost mode. The problem of a transition area of the four-switch converter is solved, and smooth transition among different modes is realized. The stability of the four-switch converter is improved, and the whole course stability of the converter in operation is ensured.
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 step-up and step-down operation of input voltage and realize the output of in-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 boost mode, which is a dual mode control strategy. However, the switching delay, dead time, etc. cause duty cycle limitation, and when the input voltage is close to the output voltage in amplitude, the voltage conversion ratio is discontinuous. This region of discrete conversion ratio near the output voltage, referred to as the "transition region", the presence of which affects the stability of the converter, therefore a multi-mode control is required to address the "transition region" problem.
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: when the input voltage and the output voltage are close in amplitude, the voltage conversion ratio is discontinuous, and the voltage enters a transition zone, and the three-mode control method is adopted, and specifically comprises the following steps:
DC voltage outer loop control, four switch buck-boost converter output voltage V o With the output voltage giving a reference value V ref The voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal d ctr ，d ctr And the method is used for determining three-mode selection, adjusting the corresponding PWM waveform of the switching tube, and the three-mode selection comprises the following steps: a transitional depressurization mode, wherein a working point P epsilon DF; a transitional boosting mode, wherein a working point P epsilon CD; boost mode, operating point P ε AB; point A position (d 2min 1), point B position (d 2max 1), point C position (d 1max *d 2max ，d 1max ) Point D position (D 2max ，d 1max ) Point F position (d 2max ，d 1min ) And d 2max ＝d 1max ＝d max Switch tube Q 1 And Q 4 The duty cycle of (2) is d 1 、1-d 1 As a pair of switching tubes with complementary duty cycles, where d 1min 、d 1max Respectively is a switching tube Q 1 Minimum and maximum duty cycles of (2); switch tube Q 2 And Q 3 The duty cycle of (2) is d 2 、1-d 2 As a pair of switching tubes with complementary duty cycles, where d 2min 、d 2max Respectively is a switching tube Q 2 Minimum and maximum duty cycles of (2); the three-mode control is performed according to the following formula,
d ctr less than or equal to 0.5 is in a transition depressurization mode; 0.5<d ctrl <0.5/d 2max Is a transitional boost mode; formula d ctrl ≥0.5/d 2max Is in a boost mode.
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 whole course stability of the converter in operation is ensured.
Drawings
FIG. 1 is a block diagram of a four-switch buck-boost converter;
FIG. 2 is a control logic diagram of a four-switch buck-boost converter according to the present invention;
FIG. 3 is a schematic diagram of a four-switch three-mode control according to the present invention;
fig. 4 is a graph showing experimental results under three-mode control of the present invention.
Detailed Description
The four-switch buck-boost converter is shown in FIG. 1, V in For the converter input voltage, V o Is the output voltage of the converter, the load is R, Q 1 ～Q 4 Is a switching tube, a switching tube Q 1 And Q 4 The duty cycle of (2) is d 1 、1-d 1 A switching tube as a pair of duty-cycle complements; switch tube Q 2 And Q 3 The duty cycle of (2) is d 2 、1-d 2 As a pair of switching tubes with complementary duty cycles.
By controlling Q 1 ～Q 4 And the inductor L is charged and discharged, and energy is transferred to the load R. Specifically, the switching tube Q 1 And Q is equal to 3 Opening, and storing energy by an inductor L; switch tube Q 2 And Q is equal to 4 Switching on, and supplying energy to a load R by an inductor L; switch tube Q 1 And Q is equal to 2 On, the inductive state depends on the input voltage V in Output voltage V 0 Size of the product.
The control logic of the invention is shown in FIG. 2, the DC voltage outer loop controls, the converter output voltage V o With the output voltage giving a reference value V ref The voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal d ctr ，d ctr For determining the operation mode of the four-switch converter, the mode selection module is used for selecting the mode according to d ctr Respectively output the switch tube Q 1 、Q 4 Duty cycle d of (2) 1 、d 2 And adjusting the corresponding PWM waveform of the switching tube.
As shown in fig. 3, the three-mode control strategy of the present invention is a transient buck mode (operating point P e DF), a transient boost mode (operating point P e CD), and a boost mode (operating point P e AB), respectively.
Deriving the formula for the mode selection module in fig. 2 in three modes: as can be seen from fig. 3, the point a position (d 2min 1), point B position (d 2max 1), point C position (d 1max *d 2max ，d 1max ) Point D position (D 2max ，d 1max ) Point F position (d 2max ，d 1min ) And d 2max ＝d 1max ＝d max Can be obtained
Transient buck mode according to equation (1) d ctrl Less than or equal to 0.5, switch tube Q 2 Is constant at d 2max Regulating Q 1 Duty cycle d of (2) 1 。
Transition boost mode 0.5 according to equation (1)<d ctrl <0.5/d 2max Switch tube Q 1 The duty cycle is constant at d 1max Regulating switch tube Q 2 Has a duty cycle d of 2 。
Boost mode: according to formula (1) d ctrl ≥0.5/d 2max Switch tube Q 1 Constant conduction (duty cycle d) 1 =1), switch tube Q 2 Has a duty cycle d of 2 。
Applying a three-mode control strategy, the voltage conversion ratio at point B and point C being equal, i.e. M C ＝M B This causes the four-switch converter to switch in mode with the same input voltage V in At the output voltage V o Unchanged (V) o-B ＝V o-C ) Thus, the stability of the four-switch converter is improved.
As shown in fig. 4, at the input voltage V in Under a certain condition of 32V, changing the given reference value V of the output voltage ref At 33V, 30V and 26V respectively, the output voltage V can be realized 0 Sequentially changing according to 33V, 30V and 26V. The converter still being able to achieve an output voltage V 0 Continuous and stable, the whole process converter operates stably.
Claims (1)
1. The three-mode control method of the four-switch buck-boost converter is characterized in that when the input voltage and the output voltage are close in amplitude, the voltage conversion ratio is discontinuous, and the three-mode control method is adopted when the voltage enters a transition zone, and specifically comprises the following steps:
DC voltage outer loop control, four switch buck-boost converter output voltage V o With the output voltage giving a reference value V ref The voltage difference is sent to a PI regulator, and the PI regulator calculates an output control signal d ctr ，d ctr And the method is used for determining three-mode selection, adjusting the corresponding PWM waveform of the switching tube, and the three-mode selection comprises the following steps: a transitional depressurization mode, wherein a working point P epsilon DF; a transitional boosting mode, wherein a working point P epsilon CD; boost mode, operating point P ε AB; point A position (d 2min 1), point B position (d 2max 1), point C position (d 1max *d 2max ，d 1max ) Point D position (D 2max ，d 1max ) Point F position (d 2max ，d 1min ) And d 2max ＝d 1max ＝d max ，
Switch tube Q 1 And Q 4 The duty cycle of (2) is d 1 、1-d 1 As a pair of switching tubes with complementary duty cycles, where d 1min 、d 1max Respectively is a switching tube Q 1 Minimum and maximum duty cycles of (2); switch tube Q 2 And Q 3 The duty cycle of (2) is d 2 、1-d 2 As a pair of switching tubes with complementary duty cycles, where d 2min 、d 2max Respectively is a switching tube Q 2 Minimum and maximum duty cycles of (2); the three-mode control is performed according to the following formula,
d ctr less than or equal to 0.5 is in a transition depressurization mode; 0.5<d ctrl <0.5/d 2max Is a transitional boost mode; formula d ctrl ≥0.5/d 2max Is in a boost mode。
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| CN113328626B (en) * | 2021-04-29 | 2022-06-17 | 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 |
| CN113472199B (en) * | 2021-06-30 | 2022-09-27 | 易事特集团股份有限公司 | Mode smooth switching method and system of Buck-Boost circuit |
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| CN101902124A (en) * | 2010-08-05 | 2010-12-01 | 西安交通大学 | Buck-Boost switch power converter for controlling grid swing |
| CN103633627A (en) * | 2013-11-07 | 2014-03-12 | 矽力杰半导体技术(杭州)有限公司 | Method and circuit for overvoltage protection control of four-switch Buck-Boost converter |
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| US9647557B2 (en) * | 2014-09-25 | 2017-05-09 | Maxim Integrated Products, Inc. | Three phases controller for buck-boost regulators |
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| CN101902124A (en) * | 2010-08-05 | 2010-12-01 | 西安交通大学 | Buck-Boost switch power converter for controlling grid swing |
| CN103633627A (en) * | 2013-11-07 | 2014-03-12 | 矽力杰半导体技术(杭州)有限公司 | Method and circuit for overvoltage protection control of four-switch Buck-Boost converter |
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