CN115360924B - Switch multiplexing type converter topological structure and modulation method thereof - Google Patents
Switch multiplexing type converter topological structure and modulation method thereof Download PDFInfo
- Publication number
- CN115360924B CN115360924B CN202211163150.5A CN202211163150A CN115360924B CN 115360924 B CN115360924 B CN 115360924B CN 202211163150 A CN202211163150 A CN 202211163150A CN 115360924 B CN115360924 B CN 115360924B
- Authority
- CN
- China
- Prior art keywords
- switching tube
- switching
- switch
- tube
- capacitor
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 53
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000033228 biological regulation Effects 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000003071 parasitic effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000002955 isolation Methods 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal 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 in a bridge configuration
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal 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
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a topological structure of a switch multiplexing type converter and a modulation method thereof, wherein the topological structure comprises the following components: the power supply end, the switch multiplexing Buck converter, the switch multiplexing LC resonant converter and the load end; the switching multiplexing Buck converter comprises a first switching tube, a second switching tube, a first inductor and a first capacitor; the switching multiplexing LC resonant converter comprises a first capacitor, a first switching loop, a second switching loop and a resonant cavity; the first switching loop comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the modulation method comprises the following steps: defining the proportion of the conduction time of the second switching tube and the third switching tube to the switching period of the switching multiplexing type converter as a duty ratio; and regulating the voltage at the two ends of the capacitor by regulating the duty ratio to change the voltage amplitude between the midpoints of the first bridge arm and the second bridge arm, thereby realizing the regulation of the voltage gain of the switch multiplexing type converter.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a topological structure of a switch multiplexing type converter and a modulation method thereof.
Background
In recent years, with the development of new energy industries, power electronic conversion devices have met with higher challenges, and more researchers have conducted extensive research to pursue high power, high conversion efficiency, and high power density of converters. The dc converter is also an important element in the electric energy conversion.
In order to improve the power conversion efficiency of the converter and its voltage regulation capability, researchers have combined Buck converters with resonant converters in series. The converter works at a resonance point to realize electric isolation and high-efficiency electric energy conversion, and the Buck converter is adopted for voltage regulation. The scheme is of a two-stage topological structure, and has the advantages of simple structure and flexible control. But the two-stage structure results in lower system conversion efficiency and an increased number of switching tubes. The resonant converter and the Buck converter are connected in parallel in input-series-output mode by workers, wherein the resonant converter works at a resonant working point, the Buck circuit adjusts the duty ratio to adjust the voltage, the scheme improves the efficiency compared with the two-stage scheme, but the topological structure of the scheme does not have the function of electric isolation.
Disclosure of Invention
The invention provides a topological structure of a switch multiplexing type converter and a modulation method thereof, and aims to adjust voltage gain of the converter and realize electrical isolation and efficient electric energy conversion of the converter.
In order to achieve the above object, the present invention provides a switching multiplexing type converter topology structure, comprising:
the power supply end, the switch multiplexing Buck converter, the switch multiplexing LC resonant converter and the load end;
the switching multiplexing Buck converter comprises a first switching tube, a second switching tube, a first inductor and a first capacitor;
The switching multiplexing LC resonant converter comprises a first capacitor, a first switching loop, a second switching loop and a resonant cavity;
The first switching loop comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;
The drain electrode of the first switch tube is connected with the positive electrode of the power end and the drain electrode of the third switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube to form a first bridge arm, the source electrode of the first switch tube is connected with one end of the first inductor, the source electrode of the second switch tube is connected with the negative electrode of the power end, the negative electrode of the first capacitor is connected with the other end of the first inductor and the source electrode of the fourth switch tube, the drain electrode of the fourth switch tube is connected with the source electrode of the third switch tube to form a second bridge arm, the first input end of the resonant cavity is connected with the source electrode of the first switch tube, the second input end of the resonant cavity is connected with the drain electrode of the fourth switch tube, the first output end of the resonant cavity is connected with the first input end of the second switch loop, the second input end of the second switch loop is connected with the positive electrode of the load end and the negative electrode of the load end respectively.
Further, the switch multiplexing LC resonant converter further includes a second capacitor for filtering the output voltage, an anode of the second capacitor is connected to a first output end of the second switch loop and an anode of the load end, and a cathode of the second capacitor is connected to a second output end of the second switch loop and a cathode of the load end.
Further, the resonant cavity comprises a blocking capacitor, a transformer, a resonant capacitor and a resonant inductor;
one end of a blocking capacitor is connected with a source electrode of the first switch tube, the other end of the blocking capacitor is connected with a first end of a primary side of the transformer, a second end of the primary side of the transformer is connected with a drain electrode of the fourth switch tube, a first end of a secondary side of the transformer is connected with one end of a resonance capacitor, the other end of the resonance capacitor is connected with a first input end of the second switch circuit, a second end of the secondary side of the transformer is connected with one end of a resonance inductor, and the other end of the resonance inductor is connected with a second input end of the second switch circuit.
Further, the second switching loop comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, wherein a source electrode of the fifth switching tube is connected with the other end of the resonant capacitor and a drain electrode of the sixth switching tube, a drain electrode of the fifth switching tube is connected with a drain electrode of the seventh switching tube, a source electrode of the sixth switching tube is connected with a source electrode of the eighth switching tube, a source electrode of the eighth switching tube is connected with a negative electrode of a load end, a drain electrode of the eighth switching tube is connected with the other end of the resonant inductor and a source electrode of the seventh switching tube, and a drain electrode of the seventh switching tube is connected with a positive electrode of the load end.
Furthermore, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube all adopt power transistors with antiparallel diodes and drain-source parasitic capacitances.
The invention also provides a modulation method of the switch multiplexing type converter topological structure, which is applied to the switch multiplexing type converter topological structure, and comprises the following steps:
Defining the proportion of the conduction time of the second switching tube and the third switching tube to the switching period of the switching multiplexing type converter as a duty ratio;
the voltage at the two ends of the first capacitor is regulated by regulating the duty ratio, so that the voltage amplitude between the midpoints of the first bridge arm and the second bridge arm is changed, and the voltage gain of the switch multiplexing type converter is regulated.
The scheme of the invention has the following beneficial effects:
the invention combines the Buck converter and the LC resonant converter in a switching multiplexing topology, so that the Buck converter and the LC resonant converter have the advantages of the Buck converter and the LC resonant converter, the voltage at the two ends of the first capacitor is regulated by regulating the duty ratio, the voltage amplitude between the midpoints of the first bridge arm and the second bridge arm is changed, the voltage gain of the switching multiplexing converter is regulated, and the electric isolation and the efficient electric energy conversion of the converter are realized; and the resonant cavity works in a current interruption mode, so that reactive current does not exist, the current effective value of the resonant cavity is effectively reduced, and the conduction loss of the converter is reduced.
Other advantageous effects of the present invention will be described in detail in the detailed description section which follows.
Drawings
FIG. 1 is a schematic diagram of a topology of an embodiment of the present invention;
Fig. 2 is a waveform diagram of the operation of the modulation method according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a locked connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Aiming at the existing problems, the invention provides a topological structure of a switch multiplexing type converter and a modulation method thereof.
As shown in fig. 1, an embodiment of the present invention provides a switching multiplexing converter topology, including:
A power supply terminal V in, a switch multiplexing Buck converter, a switch multiplexing LC resonant converter and a load terminal V o.
The switching multiplexing Buck converter has the same working principle as the common Buck converter, and comprises a first switching tube S 1, a second switching tube S 2, a first inductor L a for voltage reduction and a first capacitor C a for voltage smoothing.
The switching multiplexing LC resonant converter has the same working principle as the common Buck converter, and includes a first capacitor C a for smoothing voltage, a first switching loop, a second switching loop and a resonant cavity.
The first switching loop comprises a first switching tube S 1, a second switching tube S 2, a third switching tube S 3 and a fourth switching tube S 4; the first switching tube and the second switching tube are multiplexing switches of the switch multiplexing Buck converter and the switch multiplexing LC resonant converter, so that the number of power switching tubes is reduced, and the cost is reduced.
The drain electrode of the first switching tube S 1 is connected with the positive electrode of the power supply terminal V in and the drain electrode of the third switching tube S 3, the source electrode of the first switching tube S 1 is connected with the drain electrode of the second switching tube S 2 to form a first bridge arm, the first bridge arm is a multiplexing bridge arm of the switching multiplexing Buck converter and the switching multiplexing LC resonant converter, the source electrode of the first switching tube S 1 is connected with one end of the first inductor L a, the source electrode of the second switching tube S 2 is connected with the negative electrode of the power supply terminal V in and the negative electrode of the first capacitor C a, the positive electrode of the first capacitor C a is connected with the other end of the first inductor L a and the source electrode of the fourth switching tube S 4, the drain electrode of the fourth switching tube S 4 is connected with the source electrode of the third switching tube S 3 to form a second bridge arm, the first input end of the resonant cavity is connected with the source electrode of the first switching tube S 1, the second input end of the resonant cavity is connected with the drain electrode of the fourth switching tube S a, the first output end of the resonant cavity is connected with the first output end of the second output end of the resonant cavity is connected with the second output end of the second switching circuit, and the positive electrode of the second output end of the second output circuit of the second switching circuit is connected with the second output end of the second output circuit of the second switching circuit 3754 is connected with the second output end of the second input circuit of the second switching circuit of the resonant cavity is.
Specifically, the switch multiplexing LC resonant converter further includes a second capacitor C f for filtering the output voltage, where an anode of the second capacitor C f is connected to the first output end of the second switching circuit and an anode of the load end V o, and a cathode of the second capacitor C f is connected to the second output end of the second switching circuit and an anode of the load end V o.
Specifically, in the embodiment of the invention, the resistor R is selected as the load end V o, the positive electrode of the resistor R is connected with the positive electrode of the second capacitor C f, and the negative electrode of the resistor R is connected with the negative electrode of the output filter capacitor C f.
Specifically, the resonant cavity comprises a blocking capacitor C b, a transformer T, a resonant capacitor C r and a resonant inductor L r;
One end of a blocking capacitor C b is connected with the source electrode of the first switch tube S 1, the other end of the blocking capacitor C b is connected with the first end of the primary side of the transformer T, the second end of the primary side of the transformer T is connected with the drain electrode of the fourth switch tube S 4, the first end of the secondary side of the transformer T is connected with one end of a resonant capacitor C r, the other end of the resonant capacitor C r is connected with the first input end of the second switch loop, the second end of the secondary side of the transformer T is connected with one end of a resonant inductor L r, and the other end of the resonant inductor L r is connected with the second input end of the second switch loop.
Specifically, the second switching circuit includes a fifth switching tube S 5, a sixth switching tube S 6, a seventh switching tube S 7, and an eighth switching tube S 8, a source of the fifth switching tube S 5 is connected to the other end of the resonant capacitor C r, a drain of the sixth switching tube S 6, a drain of the fifth switching tube S 5 is connected to a drain of the seventh switching tube S 7, a source of the sixth switching tube S 6 is connected to a source of the eighth switching tube S 8, a source of the eighth switching tube S 8 is connected to a negative electrode of the load terminal V o, a drain of the eighth switching tube S 8 is connected to the other end of the resonant inductor L r, a source of the seventh switching tube S 7, and a drain of the seventh switching tube S 7 is connected to a positive electrode of the load terminal V o.
Specifically, the first switching tube S 1, the second switching tube S 2, the third switching tube S 3, the fourth switching tube S 4, the fifth switching tube S 5, the sixth switching tube S 6, the seventh switching tube S 7, and the eighth switching tube S 8 each employ a power transistor MOSFET having an antiparallel diode and a drain-source parasitic capacitance.
The embodiment of the invention also provides a modulation method of the switch multiplexing type converter topological structure, which is applied to the switch multiplexing type converter topological structure, and comprises the following steps:
the ratio of the on time of the second switching tube S 2 and the third switching tube S 3 to the switching period of the switching multiplexing type converter is defined as a duty ratio D;
The voltage at the two ends of the first capacitor C a is regulated by controlling the duty ratio, so that the amplitude of the voltage V ab between the midpoints of the first bridge arm and the second bridge arm is changed, and the voltage gain of the switch multiplexing type Buck-LC converter is regulated.
Specifically, as shown in fig. 2, the second switching transistor S 2 and the third switching transistor S 3 of the switching multiplexing type converter are turned on and off simultaneously; the first switching tube S 1 and the fourth switching tube S 4 are simultaneously turned on and off; the sixth switching tube S 6 and the seventh switching tube S 7 are simultaneously turned on and off; the fifth switching tube S 5 and the eighth switching tube S 8 are simultaneously turned on and off, the first switching tube S 1 and the second switching tube S 2 are complementarily turned on, a dead zone exists between driving signals of the first switching tube S 1 and the second switching tube S 2 so as to prevent the switching tubes of the same bridge arm from being directly short-circuited, the proportion of the conduction time of the second switching tube S 2 and the third switching tube S 3 to the switching period of the switch multiplexing converter is defined as a duty ratio D, and the second switching tube S 2 and the sixth switching tube S 6 are simultaneously turned on; the first switching tube S 1 and the fifth switching tube S 5 are simultaneously turned on; the conduction time of the fifth switching tube S 5 and the sixth switching tube S 6 is half of the resonance period of the resonant cavity; the voltage at the two ends of the first capacitor C a is regulated by controlling the duty ratio D, so that the amplitude of the voltage V ab between the midpoints of the first bridge arm and the second bridge arm is changed, and the voltage gain of the switch multiplexing type converter is regulated.
Specifically, the working process of the positive half period of the switch multiplexing type converter is symmetrical to the working process of the negative half period under the modulation method, and the working process of the positive half period is as follows:
At time t 0, the second switching tube S 2 is turned on at zero voltage, the third switching tube S 3 is turned on at zero current, the auxiliary inductance current i La linearly decreases, meanwhile, the resonance inductance L r and the resonance capacitor C r start resonance, the resonance current i r changes from zero in reverse resonance, and the sixth switching tube S 6 and the seventh switching tube S 7 serve as synchronous rectifying tubes to be turned on;
At time t 1, the resonant current i r resonates to zero, and this phase ends; meanwhile, the sixth switching tube S 6 and the seventh switching tube S 7 of the synchronous rectifying tube are turned off in zero current, the auxiliary inductance current i La continues to linearly decrease because the second switching tube S 2 is not turned off, and in the stage, the resonance current i r is constantly zero, and the switching multiplexing converter does not transmit energy;
At time t 2, the second switching tube S 2 and the third switching tube S 3 are turned off, the polarity of the auxiliary inductor current i La is negative, and the auxiliary inductor current i La freewheels through the diode of the first switching tube S 1 in dead time, so as to prepare for zero-voltage turn-on of the first switching tube S 1 at the next time.
According to the embodiment of the invention, under the conditions that the input voltage is 100V-125V and the output voltage is 400V, a 1000W converter prototype is built, and a power transistor MOSFET with anti-parallel diodes and drain-source parasitic capacitances is adopted for the first switching tube S 1, the second switching tube S 2, the third switching tube S 3, the fourth switching tube S 4, the fifth switching tube S 5, the sixth switching tube S 6, the seventh switching tube S 7 and the eighth switching tube S 8. The driving signal of the main circuit is generated by a TI digital signal processor TMS320F28377S, and under the experimental condition, the switch multiplexing type converter can normally work in a closed loop under the modulation method. The switch multiplexing type converter model machine can normally operate under different input voltages and different loads.
As can be seen from the above description, in the embodiment of the present invention, the Buck converter and the LC resonant converter are subjected to the switch multiplexing topology combination, so that the Buck converter and the LC resonant converter have the advantages of both the Buck converter and the LC resonant converter, and the voltage at both ends of the first capacitor is adjusted by adjusting the duty ratio, so that the voltage amplitude between the midpoints of the first bridge arm and the second bridge arm is changed, thereby implementing adjustment of the voltage gain of the switch multiplexing converter, and simultaneously implementing electrical isolation and efficient electric energy conversion of the converter; and the resonant cavity works in a current interruption mode, so that reactive current does not exist, the current effective value of the resonant cavity is effectively reduced, and the conduction loss of the converter is reduced.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (3)
1. A switching multiplexing converter topology comprising:
the power supply end, the switch multiplexing Buck converter, the switch multiplexing LC resonant converter and the load end;
The switching multiplexing Buck converter comprises a first switching tube, a second switching tube, a first inductor and a first capacitor;
the switch multiplexing LC resonant converter comprises the first capacitor, a first switch loop, a second switch loop and a resonant cavity;
the first switching circuit comprises the first switching tube, the second switching tube, a third switching tube and a fourth switching tube;
The drain electrode of the first switch tube is connected with the positive electrode of the power end and the drain electrode of the third switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube to form a first bridge arm, the source electrode of the first switch tube is connected with one end of the inductor, the source electrode of the second switch tube is connected with the negative electrode of the power end and the negative electrode of the first capacitor, the positive electrode of the first capacitor is connected with the other end of the first inductor and the source electrode of the fourth switch tube, the drain electrode of the fourth switch tube is connected with the source electrode of the third switch tube to form a second bridge arm, the first input end of the resonant cavity is connected with the source electrode of the first switch tube, the second input end of the resonant cavity is connected with the drain electrode of the fourth switch tube, the first output end of the resonant cavity, the second output end of the resonant cavity is connected with the first input end of the second switch loop and the second input end of the second switch loop, and the positive electrode of the second switch loop and the negative electrode of the second switch loop are respectively connected with the load end of the load;
The switching multiplexing LC resonant converter further comprises a second capacitor for filtering output voltage, wherein the positive electrode of the second capacitor is connected with the first output end of the second switching circuit and the positive electrode of the load end, and the negative electrode of the second capacitor is connected with the second output end of the second switching circuit and the negative electrode of the load end;
The resonant cavity comprises a blocking capacitor, a transformer, a resonant capacitor and a resonant inductor;
One end of the blocking capacitor is connected with the source electrode of the first switch tube, the other end of the blocking capacitor is connected with the first end of the primary side of the transformer, the second end of the primary side of the transformer is connected with the drain electrode of the fourth switch tube, the first end of the secondary side of the transformer is connected with one end of the resonance capacitor, the other end of the resonance capacitor is connected with the first input end of the second switch loop, the second end of the secondary side of the transformer is connected with one end of the resonance inductor, and the other end of the resonance inductor is connected with the second input end of the second switch loop;
The second switching loop comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, wherein a source electrode of the fifth switching tube is connected with the other end of the resonant capacitor and a drain electrode of the sixth switching tube, a drain electrode of the fifth switching tube is connected with a drain electrode of the seventh switching tube, a source electrode of the sixth switching tube is connected with a source electrode of the eighth switching tube, a source electrode of the eighth switching tube is connected with a negative electrode of the load end, a drain electrode of the eighth switching tube is connected with the other end of the resonant inductor and a source electrode of the seventh switching tube, and a drain electrode of the seventh switching tube is connected with a positive electrode of the load end.
2. The switching multiplexing converter topology of claim 1, wherein,
The first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube all adopt power transistors with antiparallel diodes and drain-source parasitic capacitances.
3. A method for modulating a topology of a switching multiplexing converter, applied to the topology of a switching multiplexing converter according to any one of claims 1-2, the method comprising:
Defining the proportion of the conduction time of the second switching tube and the third switching tube to the switching period of the switching multiplexing type converter as a duty ratio;
And regulating the voltage at two ends of the first capacitor by regulating the duty ratio to change the voltage amplitude between the midpoints of the first bridge arm and the second bridge arm, thereby realizing the regulation of the voltage gain of the switch multiplexing type converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211163150.5A CN115360924B (en) | 2022-09-23 | 2022-09-23 | Switch multiplexing type converter topological structure and modulation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211163150.5A CN115360924B (en) | 2022-09-23 | 2022-09-23 | Switch multiplexing type converter topological structure and modulation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115360924A CN115360924A (en) | 2022-11-18 |
| CN115360924B true CN115360924B (en) | 2024-04-16 |
Family
ID=84007284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211163150.5A Active CN115360924B (en) | 2022-09-23 | 2022-09-23 | Switch multiplexing type converter topological structure and modulation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115360924B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118889860B (en) * | 2024-09-30 | 2025-01-28 | 中南大学 | A single-stage converter for step-down conversion and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196518A (en) * | 2017-07-04 | 2017-09-22 | 天津大学 | A kind of topological transformation type multi-resonant element resonance Sofe Switch DC converter |
| CN109981087A (en) * | 2019-03-05 | 2019-07-05 | 中南大学 | A kind of Vehicular battery intelligent independent switching switch module |
| CN110768535A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| CN111262442A (en) * | 2020-01-22 | 2020-06-09 | 湖北工业大学 | A Resonant Converter Based on ON/OFF Control |
| CN111262447A (en) * | 2020-03-16 | 2020-06-09 | 浙江大学 | Wide-output-voltage-range resonant converter topology and control method thereof |
-
2022
- 2022-09-23 CN CN202211163150.5A patent/CN115360924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196518A (en) * | 2017-07-04 | 2017-09-22 | 天津大学 | A kind of topological transformation type multi-resonant element resonance Sofe Switch DC converter |
| CN109981087A (en) * | 2019-03-05 | 2019-07-05 | 中南大学 | A kind of Vehicular battery intelligent independent switching switch module |
| CN110768535A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| WO2021077757A1 (en) * | 2019-10-22 | 2021-04-29 | 广州金升阳科技有限公司 | Wide gain control method for variable topology llc resonant converter |
| CN111262442A (en) * | 2020-01-22 | 2020-06-09 | 湖北工业大学 | A Resonant Converter Based on ON/OFF Control |
| CN111262447A (en) * | 2020-03-16 | 2020-06-09 | 浙江大学 | Wide-output-voltage-range resonant converter topology and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115360924A (en) | 2022-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11496054B2 (en) | High-gain quasi-resonant DC-DC converter based on voltage doubling rectifier circuit | |
| TWI511429B (en) | Converting circuit and method of converting electrical power | |
| CN112928919B (en) | Isolated high-frequency resonant DC-DC converter with wide output voltage range and method | |
| CN110289766A (en) | A Bidirectional Three-Phase LLC Resonant Converter | |
| CN114301301A (en) | Wide-range resonant soft-switching bidirectional direct-current converter and control method thereof | |
| CN114337344B (en) | Control method based on self-adaptive hybrid rectification multi-switch resonance LLC converter | |
| CN110190752B (en) | A bidirectional CLLLC-DCX resonant converter and its control method | |
| CN114285286B (en) | A single-stage zero-current switching full-bridge step-up DC converter and its control method | |
| CN113890375B (en) | Bi-polar output bi-directional LLC resonant converter topology | |
| CN114583967A (en) | Isolated direct-current boost converter of two-phase parallel boost circuit and control method thereof | |
| CN114649955B (en) | A DC converter topology with output voltage regulation capability | |
| CN110224605B (en) | A full bridge conversion circuit | |
| CN111884521B (en) | Single-stage Boost full-bridge boost zero-current switching DC converter and its control method | |
| CN110445387B (en) | A kind of topology structure and control method of component power supply | |
| CN115360924B (en) | Switch multiplexing type converter topological structure and modulation method thereof | |
| CN114977830A (en) | High-voltage gain bridge type DC-DC converter | |
| CN109274274A (en) | Five-element resonant converter | |
| CN115664225B (en) | Active clamp isolation bidirectional resonant converter and modulation method thereof | |
| CN111404415A (en) | Urban rail vehicle auxiliary converter considering switching loss and operation strategy optimization method | |
| CN114649856B (en) | High-efficiency charging circuit | |
| CN116111830A (en) | A Half-Bridge-Full-Bridge Combined LLC Resonant DC Converter Based on Dual Transformers | |
| CN114785143A (en) | A loop-free frequency conversion modulation method suitable for LC series resonant full-bridge converters | |
| CN103490625B (en) | A kind of boost type DC converter | |
| Moradisizkoohi et al. | Ultra-high step-up DC/DC converter based on dual-coupled-inductors with low voltage stress and input current ripple for renewable energy applications | |
| CN111555633A (en) | A DC transformer for new energy DC grid connection and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |