CN113346750A - Soft-switching non-inverting buck-boost converter and control method based on coupled inductor - Google Patents
Soft-switching non-inverting buck-boost converter and control method based on coupled inductor Download PDFInfo
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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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- 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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
本发明提供了一种基于耦合电感的软开关同相buck‑boost变换器及控制方法，包括：电源；第一开关管，所述第一开关管的漏极端与所述电源的正极端电连接；第二开关管，所述第二开关管的漏极端与所述第一开关管的源极端电连接，所述第二开关管的源极端与所述电源的负极端电连接。本发明所述的基于耦合电感的软开关同相buck‑boost变换器及控制方法，仅使用两路互补的PWM信号进行控制，控制方式简单，通过辅助电感与主电感耦合产生辅助电流进而实现四个开关管的软开关条件，通过改变占空比改变输出电压增益，实现正常负载下的恒电压增益，大大减少了辅助器件的数量，提高了传输效率，增大了功率密度。
The present invention provides a soft-switching non-inverting buck-boost converter based on coupled inductance and a control method, including: a power supply; a first switch tube, the drain terminal of the first switch tube is electrically connected to the positive terminal of the power supply; A second switch tube, the drain terminal of the second switch tube is electrically connected to the source terminal of the first switch tube, and the source terminal of the second switch tube is electrically connected to the negative terminal of the power supply. The soft-switching non-inverting buck-boost converter based on coupled inductance and the control method of the present invention only use two complementary PWM signals for control, the control method is simple, and the auxiliary current is generated by coupling the auxiliary inductance and the main inductance to realize four The soft-switching condition of the switch tube changes the output voltage gain by changing the duty cycle to achieve constant voltage gain under normal load, which greatly reduces the number of auxiliary devices, improves the transmission efficiency, and increases the power density.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a soft switching in-phase buck-boost converter based on coupling inductors and a control method.
Background
In recent years, DC-DC converters have been widely used in various fields, particularly in various power supply systems including high-voltage direct-current power transmission including energy storage units, micro-grids, electric vehicles, and the like. With the increasing requirements for energy conversion in the field of power electronics, converters are gradually developing toward higher frequencies, higher efficiencies, and higher power densities. There are many applications today that require a constant output voltage even if the input or load changes, such as portable devices and automotive electronics that use batteries as a power source, requiring a buck/boost converter to handle the change in input and produce a stable output voltage. DC/DC converters, however, are classified into two broad types, isolated and non-isolated, and non-isolated converters are preferred for such applications due to the size and space constraints and better rejection of common mode interference.
Due to the simple structure and the wide voltage range conversion capability, the in-phase buck-boost converter (NIBBC) is widely applied to the fields of renewable energy development, energy storage equipment, even basic power converter module integration and the like. To simplify the control of the NIBBC, the two switches are usually switched synchronously, in which case the NIBBC has two control variables, including the two duty cycles of the two sets of switches. This control is easy to implement, but the converter efficiency is reduced because there are always two switches operating under hard switching. To reduce switching losses, the zero voltage switching technique of NIBBC has been extensively studied. These methods can be broadly classified into no auxiliary circuit and auxiliary circuit according to the type of auxiliary device.
The non-auxiliary circuit NIBBC mainly adopts a Triangular Current Mode (TCM) operation and a corresponding modulation mode, and provides a soft switching condition for the NIBBC without adding additional auxiliary equipment. However, the transmission delay and dead time of the comparator can lead to unpredictable output voltage ripple, resulting in converter failure. Ripple interference can be eliminated through a mode conversion technology of duty cycle lock control. However, this complicates the control of the inverter and reduces the reliability of the device.
To achieve all soft switching conditions for NIBBC, simplifying the control strategy, auxiliary circuitry may be added. The zero voltage is achieved using an auxiliary circuit consisting of an inductor, an auxiliary switch and a power diode. Although the volume of the auxiliary circuit is reduced, additional control methods and driving circuits are still required. Documents (y.zhang, x.cheng and c.yin, "a soft-switching non-inverting buck-boost converter with inductance and performance improvement," in IEEE Transactions on Power Electronics, vol.34, No.12, pp.11526-11530, dec.2019) propose a coupled inductor auxiliary circuit, which uses magnetic coupling effect to generate auxiliary current to achieve zero voltage, and can adjust soft switching range by adjusting auxiliary current. However, this solution adds a larger number of auxiliary devices, reducing the power density of the device and also increasing the corresponding device losses.
Disclosure of Invention
The invention provides a soft-switching in-phase buck-boost converter based on coupling inductance and a control method, and aims to solve the problems that the traditional in-phase buck-boost converter is difficult to realize full-range soft switching and has more auxiliary devices.
In order to achieve the above object, an embodiment of the present invention provides a soft-switching in-phase buck-boost converter based on coupled inductors, including:
a power source;
the drain end of the first switch tube is electrically connected with the positive electrode end of the power supply;
the drain end of the second switching tube is electrically connected with the source end of the first switching tube, and the source end of the second switching tube is electrically connected with the cathode end of the power supply;
the coupling inductor comprises an auxiliary inductor and a main inductor, and a first end of the auxiliary inductor is electrically connected with a source end of the first switching tube; the first end of the main inductor is electrically connected with the drain end of the second switching tube;
the negative end of the auxiliary diode is electrically connected with the second end of the auxiliary inductor;
a source end of the third switching tube is electrically connected with a positive electrode end of the auxiliary diode;
a drain terminal of the fourth switching tube is electrically connected with a source terminal of the third switching tube and a second terminal of the main inductor respectively, and a source terminal of the fourth switching tube is electrically connected with a source terminal of the second switching tube;
a first end of the capacitor is electrically connected with a drain end of the third switching tube, and a second end of the capacitor is electrically connected with a source end of the fourth switching tube;
and the first end of the resistor is electrically connected with the first end of the capacitor, and the second end of the resistor is electrically connected with the second end of the capacitor.
Wherein, still include: and the auxiliary diode reversely freewheels the auxiliary inductor, and body diodes of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switched on before the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switched on under the combined action of auxiliary branch current and main inductor current, and four switch tubes form a soft switching condition.
The embodiment of the invention also provides a control method of the soft-switching in-phase buck-boost converter based on the coupling inductor, which comprises the following steps:
and 3, regulating the duty ratio d through the PWM signal to further change the voltage gain of the converter.
The scheme of the invention has the following beneficial effects:
the soft-switching in-phase buck-boost converter based on the coupling inductor and the control method thereof in the embodiment of the invention only use two complementary PWM signals for control, the control mode is simple, the auxiliary inductor is coupled with the main inductor to generate auxiliary current so as to realize the soft switching condition of four switching tubes, the output voltage gain is changed by changing the duty ratio, the constant voltage gain under normal load is realized, the number of auxiliary devices is greatly reduced, the transmission efficiency is improved, and the power density is increased.
Drawings
FIG. 1 is a specific circuit diagram of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic diagram of an exemplary operating waveform of the present invention;
FIG. 4 is a schematic diagram of a current path in a first switching mode according to the present invention;
FIG. 5 is a schematic diagram of a current path in a second switching mode according to the present invention;
FIG. 6 is a schematic diagram of a current path in a third switching mode according to the present invention;
FIG. 7 is a schematic diagram of a current path in a fourth switching mode according to the present invention;
FIG. 8 is a schematic diagram of a current path in a fifth switching mode according to the present invention;
fig. 9 is a schematic view of a current path in a sixth switching mode according to the present invention.
[ description of reference ]
1-a power supply; 2-a first switching tube; 3-a second switch tube; 4-auxiliary inductance; 5-an auxiliary diode; 6-main inductance; 7-a third switching tube; 8-a fourth switching tube; 9-capacitance; 10-resistance; 11-coupled inductance.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a soft-switching in-phase buck-boost converter based on coupling inductance and a control method thereof, aiming at the problems that the existing in-phase buck-boost converter is difficult to realize full-range soft switching and has more auxiliary devices.
As shown in fig. 1 to 9, an embodiment of the present invention provides a soft-switching in-phase buck-boost converter based on coupled inductors, including: a power supply 1; the drain end of the first switch tube 2 is electrically connected with the positive electrode end of the power supply 1; a second switching tube 3, a drain terminal of the second switching tube 3 being electrically connected to a source terminal of the first switching tube 2, and a source terminal of the second switching tube 3 being electrically connected to a cathode terminal of the power supply 1; the coupling inductor 11 comprises an auxiliary inductor 4 and a main inductor 6, and a first end of the auxiliary inductor 4 is electrically connected with a source end of the first switching tube 2; a first end of the main inductor 6 is electrically connected with a drain end of the second switching tube 3, and a negative end of the auxiliary diode 5 is electrically connected with a second end of the auxiliary inductor 4; a third switching tube 7, wherein a source terminal of the third switching tube 7 is electrically connected with a positive terminal of the auxiliary diode 5; a fourth switching tube 8, a drain terminal of the fourth switching tube 8 is electrically connected to a source terminal of the third switching tube 7 and a second terminal of the main inductor 6, respectively, and a source terminal of the fourth switching tube 8 is electrically connected to a source terminal of the second switching tube 3; a first end of the capacitor 9 is electrically connected with a drain end of the third switching tube 7, and a second end of the capacitor 9 is electrically connected with a source end of the fourth switching tube 8; a resistor 10, a first end of the resistor 10 is electrically connected to a first end of the capacitor 9, and a second end of the resistor 10 is electrically connected to a second end of the capacitor 9.
Wherein, still include: through the auxiliary diode 5 to the reverse afterflow of auxiliary inductance 4, through the combined action of auxiliary branch road current and main inductance current, make first switch tube 2, second switch tube 3, third switch tube 7 and before fourth switch tube 8 switches on first switch tube 2, second switch tube 3, third switch tube 7 and the body diode of fourth switch tube 8 switches on, four switch tubes form the soft switch condition.
In the soft-switching in-phase buck-boost converter and the control method based on the coupled inductor according to the embodiments of the invention, the auxiliary branch current iLaFor the current flowing through the auxiliary inductor 4 and the auxiliary diode 5, the main inductor current iLFor the current flowing through the main inductor 6, the auxiliary inductor 4LaIs connected with the auxiliary diode 5 in series to form an auxiliary branch circuit, and the auxiliary inductor 4L is connected with the auxiliary diode 5aThe current is reversely continued, the coupling coefficient of the auxiliary inductor 4 and the main inductor 6 is k, so that the body diodes of all the switching tubes are ensured to be conducted before the switching tubes are conducted, the soft switching condition of four switching tubes is realized, the main inductor 6 and the auxiliary inductor 4 are used for replacing the main inductor 6 in the traditional in-phase buck-boost converter, the auxiliary current is generated by using the magnetic coupling effect to realize the soft switching condition of four switching tubes, and meanwhile, the auxiliary branch circuit is only composed of one auxiliary inductor 4 and one auxiliary diode 5, so that the number of auxiliary devices is greatly reduced, the transmission efficiency is improved, and the power density is increased.
The embodiment of the invention also provides a control method of the soft-switching in-phase buck-boost converter based on the coupling inductor, which comprises the following steps: step 1, respectively inputting one path of PWM signals into a grid terminal of a first switch tube and a grid terminal of a fourth switch tube, respectively inputting the other path of PWM signals into a grid terminal of a second switch tube and a grid terminal of a third switch tube, wherein the two paths of PWM signals are complementary, and the switching period is TsOne switching cycle comprises six switching modes, two switching tubes of each bridge arm of the converter are in complementary conduction, and the first switching tube and the fourth switching tube are synchronously conducted and disconnected; step 2, obtaining the relation between the input voltage and the output voltage according to the volt-second balance of the inductor; and 3, regulating the duty ratio d through the PWM signal to further change the voltage gain of the converter.
Wherein, the step 1 specifically comprises: the first switching mode is t0～t1: the first switching mode starts when the first switching tube and the fourth switching tube are turned off, and in the first switching mode, the current i flowing through the main inductorLPositive, auxiliary branch current i flowing through auxiliary inductor and diodeLaIs close to zeroBy the difference i of two currentsL-iLaAnd after the charging and discharging of the parasitic capacitors of all the switching tubes are completed, the second switching tube is conducted with the third switching tube.
Wherein, the step 1 further comprises: the second switching mode is t1～t2: when the body diodes of the second switch tube and the third switch tube are conducted, the second switch mode begins, and in the second switch mode, the drain-source electrode voltage v of the second switch tubeS2And drain-source voltage v of third switch tubeS4Reducing to zero.
Wherein, the step 1 further comprises: the third switching mode is t2～t3: the third switching mode starts when the second switching tube and the third switching tube are at zero voltage, in the third switching mode, the output power of the main inductor is transmitted to the resistor, and the current i of the main inductor isLGradually decreasing, auxiliary branch current iLaAnd gradually increases.
Wherein, the step 1 further comprises: the fourth switching mode is t3～t4: when the fourth switching mode starts to turn off the second switching tube and the third switching tube, in the fourth switching mode, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all in the turn-off state, and the main inductive current iLReduced to a minimum value, auxiliary branch current iLaIncrease to a maximum value, and iLa>iLBy the difference of the currents iL-iLaAnd charging the parasitic capacitors of the second switching tube and the third switching tube, and discharging the parasitic capacitors of the first switching tube and the fourth switching tube until the body diodes of the first switching tube and the fourth switching tube are conducted.
Wherein, the step 1 further comprises: the fifth switching mode is t4～t5: at t4At the moment, the parasitic capacitors of all the switch tubes are charged and discharged, the body diodes of the first switch tube and the fourth switch tube are conducted, and the drain-source voltage v of the first switch tube isS1And the drain-source electrode voltage v of the fourth switch tubeS3Reducing to zero.
Wherein, the step 1 further comprises: the sixth switching mode ist5～t6: at t5At the moment, the first switching tube and the fourth switching tube are conducted at zero voltage, in the sixth switching mode, power is stored in the main inductor, and the current i of the main inductor isLThe current is gradually increased to assist the branch current iLaAnd gradually reducing to zero until the first switching tube and the fourth switching tube are turned off.
Wherein, the step 2 specifically comprises: obtaining an input voltage V from the volt-second balance of the inductanceinAnd an output voltage VoutThe relationship between them is as follows:
Vind＝Vout(1-d) (1)
wherein d represents the duty ratio, the duty ratio of the driving signals of the first switching tube and the fourth switching tube is d, and the duty ratio of the driving signals of the second switching tube and the third switching tube is 1-d.
In the soft-switching in-phase buck-boost converter and the control method based on the coupled inductor according to the above embodiments of the present invention, as shown in fig. 1, the first switching tube 2 is S1The second switch tube 3 is S2The third switch tube 7 is S4The fourth switching tube 8 is S3The first switch tube 2, the second switch tube 3, the third switch tube 7 and the fourth switch tube 8 are all switch tubes including parasitic capacitances of anti-parallel body diodes and drain source electrodes; the parasitic capacitance of the first switch tube 2 is Cs1The parasitic capacitance of the second switch tube 3 is Cs2The parasitic capacitance of the third switch tube 7 is Cs4The parasitic capacitance of the fourth switch tube 8 is Cs3(ii) a In FIG. 3, vG1Represents the gate-source voltage, v, of the first switching tube 2G2Represents the gate-source voltage, v, of the second switching tube 3G3Represents the gate-source voltage, v, of the fourth switching tube 8G4Represents the gate-source voltage of the third switching tube 7.
The soft-switching in-phase buck-boost converter based on the coupling inductor and the control method thereof have the advantages that the control mode is simple, only two paths of complementary PWM signals are used, the output voltage gain is changed by changing the duty ratio d, the auxiliary inductor 4 is coupled with the main inductor 6, the generated auxiliary current can realize the soft-switching condition of four switching tubes, the number of auxiliary devices is small, and the power density of the converter is greatly improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A soft-switching in-phase buck-boost converter based on coupled inductors, comprising:
a power source;
the drain end of the first switch tube is electrically connected with the positive electrode end of the power supply;
the drain end of the second switching tube is electrically connected with the source end of the first switching tube, and the source end of the second switching tube is electrically connected with the cathode end of the power supply;
the coupling inductor comprises an auxiliary inductor and a main inductor, and a first end of the auxiliary inductor is electrically connected with a source end of the first switching tube; the first end of the main inductor is electrically connected with the drain end of the second switching tube;
the negative end of the auxiliary diode is electrically connected with the second end of the auxiliary inductor;
a source end of the third switching tube is electrically connected with a positive electrode end of the auxiliary diode;
a drain terminal of the fourth switching tube is electrically connected with a source terminal of the third switching tube and a second terminal of the main inductor respectively, and a source terminal of the fourth switching tube is electrically connected with a source terminal of the second switching tube;
a first end of the capacitor is electrically connected with a drain end of the third switching tube, and a second end of the capacitor is electrically connected with a source end of the fourth switching tube;
and the first end of the resistor is electrically connected with the first end of the capacitor, and the second end of the resistor is electrically connected with the second end of the capacitor.
2. The coupled-inductor-based soft-switched in-phase buck-boost converter according to claim 1, further comprising:
and the auxiliary diode reversely freewheels the auxiliary inductor, and body diodes of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switched on before the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switched on under the combined action of auxiliary branch current and main inductor current, and four switch tubes form a soft switching condition.
3. A control method of a coupled-inductor-based soft-switching in-phase buck-boost converter, applied to the coupled-inductor-based soft-switching in-phase buck-boost converter according to claims 1-2, comprising:
step 1, respectively inputting one path of PWM signals into a grid terminal of a first switch tube and a grid terminal of a fourth switch tube, respectively inputting the other path of PWM signals into a grid terminal of a second switch tube and a grid terminal of a third switch tube, wherein the two paths of PWM signals are complementary, and the switching period is TsOne switching cycle comprises six switching modes, two switching tubes of each bridge arm of the converter are in complementary conduction, and the first switching tube and the fourth switching tube are synchronously conducted and disconnected;
step 2, obtaining the relation between the input voltage and the output voltage according to the volt-second balance of the inductor;
and 3, regulating the duty ratio d through the PWM signal to further change the voltage gain of the converter.
4. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 3, wherein the step 1 specifically comprises:
the first switching mode is t0～t1: the first switching mode starts when the first switching tube and the fourth switching tube are turned offIn the first switching mode, the current i flowing through the main inductorLPositive, auxiliary branch current i flowing through auxiliary inductor and diodeLaClose to zero, passing the difference i between the two currentsL-iLaAnd after the charging and discharging of the parasitic capacitors of all the switching tubes are completed, the second switching tube is conducted with the third switching tube.
5. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 4, wherein the step 1 further comprises:
the second switching mode is t1～t2: when the body diodes of the second switch tube and the third switch tube are conducted, the second switch mode begins, and in the second switch mode, the drain-source electrode voltage v of the second switch tubeS2And drain-source voltage v of third switch tubeS4Reducing to zero.
6. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 5, wherein the step 1 further comprises:
the third switching mode is t2～t3: the third switching mode starts when the second switching tube and the third switching tube are at zero voltage, in the third switching mode, the output power of the main inductor is transmitted to the resistor, and the current i of the main inductor isLGradually decreasing, auxiliary branch current iLaAnd gradually increases.
7. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 6, wherein the step 1 further comprises:
the fourth switching mode is t3～t4: when the fourth switching mode starts to turn off the second switching tube and the third switching tube, in the fourth switching mode, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all in the turn-off state, and the main inductive current iLReduced to a minimum value, auxiliary branch current iLaIncrease to a maximum value, and iLa>iLBy the difference of the currents iL-iLaAnd charging the parasitic capacitors of the second switching tube and the third switching tube, and discharging the parasitic capacitors of the first switching tube and the fourth switching tube until the body diodes of the first switching tube and the fourth switching tube are conducted.
8. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 7, wherein the step 1 further comprises:
the fifth switching mode is t4～t5: at t4At the moment, the parasitic capacitors of all the switch tubes are charged and discharged, the body diodes of the first switch tube and the fourth switch tube are conducted, and the drain-source voltage v of the first switch tube isS1And the drain-source electrode voltage v of the fourth switch tubeS3Reducing to zero.
9. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 8, wherein the step 1 further comprises:
the sixth switching mode is t5～t6: at t5At the moment, the first switching tube and the fourth switching tube are conducted at zero voltage, in the sixth switching mode, power is stored in the main inductor, and the current i of the main inductor isLThe current is gradually increased to assist the branch current iLaAnd gradually reducing to zero until the first switching tube and the fourth switching tube are turned off.
10. The method for controlling the coupled-inductor-based soft-switching in-phase buck-boost converter according to claim 9, wherein the step 2 specifically comprises:
obtaining an input voltage V from the volt-second balance of the inductanceinAnd an output voltage VoutThe relationship between them is as follows:
Vind＝Vout(1-d) (1)
wherein d represents the duty ratio, the duty ratio of the driving signals of the first switching tube and the fourth switching tube is d, and the duty ratio of the driving signals of the second switching tube and the third switching tube is 1-d.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115296515A (en) * | 2022-08-16 | 2022-11-04 | 深圳市皓文电子股份有限公司 | Modulation system of four-switch-tube buck-boost conversion circuit |
| CN115566908A (en) * | 2022-11-23 | 2023-01-03 | 中南大学 | Isolated bidirectional buck-boost resonant converter and its control method |
| WO2023213292A1 (en) * | 2022-05-06 | 2023-11-09 | 长春捷翼汽车科技股份有限公司 | Combined control voltage converter, control method, power supply, and new energy vehicle |
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| CN115566908A (en) * | 2022-11-23 | 2023-01-03 | 中南大学 | Isolated bidirectional buck-boost resonant converter and its control method |
| CN115566908B (en) * | 2022-11-23 | 2023-03-14 | 中南大学 | Isolated bidirectional buck-boost type resonant converter and control method thereof |
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