CN112737348B - Magnetic integration three-port DC-DC converter - Google Patents
Magnetic integration three-port DC-DC converter Download PDFInfo
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- CN112737348B CN112737348B CN202110089183.9A CN202110089183A CN112737348B CN 112737348 B CN112737348 B CN 112737348B CN 202110089183 A CN202110089183 A CN 202110089183A CN 112737348 B CN112737348 B CN 112737348B
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- 230000010354 integration Effects 0.000 title claims abstract description 79
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims description 111
- 230000004907 flux Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
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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
- H02M3/22—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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M3/22—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
- H02M3/33584—Bidirectional 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
- 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
- H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a magnetic integration three-port DC-DC converter, which is characterized by comprising: the direct-current voltage source, the input filter capacitor, the storage battery power supply, the primary full bridge, the secondary full bridge, the first magnetic integration structure, the second magnetic integration structure, the output filter capacitor and the output load; the whole circuit topology structure is integrated by a two-phase staggered parallel bidirectional Buck-Boost circuit and a double active bridge circuit, wherein the two-phase staggered parallel bidirectional Buck-Boost circuit is formed by a first magnetic integrated structure and a primary full bridge, and the double active bridge circuit is formed by the primary full bridge, a second magnetic integrated structure and a secondary full bridge; the first magnetic integrated structure integrates two inductors in the staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the second magnetic integrated structure integrates the inductor and the transformer in the double-active-bridge circuit in one magnetic core. The invention integrates the staggered parallel bidirectional Buck/Boost circuit and the double active bridge circuit together through the shared primary full bridge, and reduces the number of switching tubes through multiplexing of the switching tubes, reduces the switching loss and reduces the cost.
Description
Technical Field
The invention relates to the technical field of power electronic converters and power electronic magnetic integration in photovoltaic power generation systems, hybrid electric vehicles, hybrid energy storage systems and the like, in particular to a magnetic integration three-port DC-DC converter.
Background
The energy is the most basic material foundation for human survival and social development, and at present, the earth energy is gradually in shortage, the environmental pollution is serious, and the climate change is severe, so that in order to solve the series of problems, the human beings pay more and more attention to new energy technologies such as photovoltaic power generation, wind power generation and the like. In order to better utilize energy, renewable energy sources, other energy sources and an energy storage system are often combined to form a renewable energy source combined power supply system, such as a photovoltaic-storage battery combined power supply system, the introduction of the storage battery improves the utilization rate of system energy, improves the operation efficiency of the system, and utilizes a multiport converter to connect each unit in the system so as to realize stable and efficient energy transmission. The existing combined power supply system is complex in structure, a power conversion unit is correspondingly added to each port, the system cost is high, and the reliability is low. The three-port DC-DC converter replaces the existing converter structure through multiplexing of the switch tube, so that the circuit structure can be simplified, and the cost can be reduced. However, the number of magnetic elements is increased, the size and weight of the converter are increased, and the system loss is high, the efficiency is low, and the improvement of the power density of the converter is not facilitated. By magnetically integrating the discrete magnetic components in the three-port DC-DC converter, the volume and weight of the magnetic components can be effectively reduced, the system loss is reduced, and the magnetic component has important significance in improving the performance and the power density of the three-port converter. Most of the prior art is used for magnetic integration of an isolated or non-isolated converter, and the magnetic integration of a switching tube multiplexing type three-port DC-DC converter is less.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnetic integration three-port DC-DC converter so as to realize the magnetic integration of a switching tube multiplexing three-port DC-DC converter, thereby reducing the number of magnetic elements, improving the power density of the converter and reducing the cost and loss of a system.
The invention provides a magnetic integration three-port DC-DC converter, which comprises a direct-current voltage source Vin, an input filter capacitor Cin, a storage battery power supply Vbat, a primary full bridge, a secondary full bridge, a magnetic integration structure I, a magnetic integration structure II, an output filter capacitor C0 and an output load R0, wherein the input filter capacitor Cin is connected with the storage battery power supply Vbat; the first magnetic integrated structure is connected with the second magnetic integrated structure, the primary full bridge and the storage battery power supply Vbat respectively, the second magnetic integrated structure is connected with the first magnetic integrated structure, the primary full bridge and the secondary full bridge respectively, the storage battery power supply Vbat is connected with the direct-current voltage source Vin and the input filter capacitor Cin, and the secondary full bridge is connected with the output filter capacitor C0 and the output load R0; the whole circuit topology structure is integrated by a two-phase staggered parallel bidirectional Buck-Boost circuit and a double active bridge circuit, wherein the two-phase staggered parallel bidirectional Buck-Boost circuit is formed by a first magnetic integrated structure and a primary full bridge, and the double active bridge circuit is formed by the primary full bridge, a second magnetic integrated structure and a secondary full bridge; the direct-current voltage source Vin is connected with the input filter capacitor Cin; the primary full bridge comprises a switching tube S1, a switching tube S2, a switching tube S3 and a switching tube S4, wherein the source electrode of the switching tube S1 is connected with the drain electrode of the switching tube S2, the source electrode of the switching tube S3 is connected with the drain electrode of the switching tube S4, the drain electrode of the switching tube S1 is connected with the drain electrode of the switching tube S3, and the source electrode of the switching tube S2 is connected with the source electrode of the switching tube S4; the input filter capacitor Cin is connected with the drain electrode of the switching tube S1 and the drain electrode of the switching tube S3 of the primary full bridge, and the source electrode of the switching tube S2 and the source electrode of the switching tube S4; the secondary full bridge comprises a switching tube S5, a switching tube S6, a switching tube S7 and a switching tube S8, wherein the source electrode of the switching tube S5 is connected with the drain electrode of the switching tube S6, the source electrode of the switching tube S7 is connected with the drain electrode of the switching tube S8, the drain electrode of the switching tube S5 is connected with the drain electrode of the switching tube S7, and the source electrode of the switching tube S6 is connected with the source electrode of the switching tube S8; the magnetic integration structure one port 1 'is connected with the port 2' and then connected with the positive electrode of a storage battery power supply, the magnetic integration structure one port 3 is connected with the primary full-bridge side port A, and the magnetic integration structure one port 4 is connected with the primary full-bridge side port B; the positive electrode of the storage battery power supply Vbat is connected with a port 1 'and a port 2' of the magnetic integrated structure, and the negative electrode of the storage battery power supply Vbat is connected with the negative electrode of the direct current voltage source Vin; the magnetic integration structure two ports 1 are connected with the primary full-bridge side port A, the magnetic integration structure two ports 2 are connected with the primary full-bridge side port B, the magnetic integration structure two ports 3 are connected with the secondary full-bridge side port C, and the magnetic integration structure two ports 4 are connected with the secondary full-bridge side port D; the output filter capacitor C0 is connected with the drain electrode of the secondary full-bridge switching tube S5, the drain electrode of the switching tube S7, the source electrode of the secondary full-bridge switching tube S6 and the source electrode of the switching tube S8; the output load R0 is connected with the output filter capacitor C0.
Optionally, the first magnetic integrated structure comprises an EE/EI magnetic core or a planar magnetic core, a first inductance winding L1, a second inductance first winding L21, and a second inductance second winding L22; the first inductance winding L1 is wound on the magnetic core center post III, the second inductance first winding L21 is wound on the magnetic core left side post I, and the second inductance second winding L22 is wound on the magnetic core right side post II; one end of the first inductance winding L1 is used as a port 1' of the magnetic integration structure, the other end of the first inductance winding L1 is used as a port 2' of the magnetic integration structure, one end of the second inductance first winding L21 is used as a port 3' of the magnetic integration structure, the other end of the second inductance first winding L21 is connected with the second inductance second winding L22, and the other end of the second inductance second winding L22 is used as a port 4 of the magnetic integration structure; the EE/EI magnetic core or the plane magnetic core is provided with an air gap.
Optionally, the second magnetic integrated structure includes an EE/EI magnetic core or planar magnetic core, a third inductance winding L3, a primary first winding NP1, a primary second winding NP2, a secondary first winding NS1, and a secondary second winding NS2; the third inductance winding L3 is wound on the magnetic core middle column III, the primary first winding NP1 is wound on the magnetic core left side column I, the primary second winding NP2 is wound on the magnetic core right side column II, the secondary first winding NS1 is wound on the magnetic core left side column I, and the secondary second winding NS2 is wound on the magnetic core right side column II; the homonymous end of the third inductance winding L3 is used as a magnetic integration structure two-port 1, the heteronymous end of the third inductance winding L3 is connected with the homonymous end of the primary side first winding NP1, the heteronymous end of the primary side first winding NP1 is connected with the homonymous end of the primary side second winding NP2, the heteronymous end of the primary side second winding NP2 is used as a magnetic integration structure two-port 2, the homonymous end of the secondary side first winding NS1 is used as a magnetic integration structure two-port 3, the heteronymous end of the secondary side first winding NS1 is connected with the homonymous end of the secondary side second winding NS2, and the heteronymous end of the secondary side second winding NS2 is used as a magnetic integration structure two-port 4; the EE/EI magnetic core or the plane magnetic core is provided with an air gap.
Optionally, the whole circuit topology structure is integrated by a two-phase staggered parallel bidirectional Buck-Boost circuit and a double active bridge circuit, the first magnetic integrated structure and the primary full bridge form the two-phase staggered parallel bidirectional Buck-Boost circuit, and the primary full bridge, the second magnetic integrated structure and the secondary full bridge form the double active bridge circuit.
Optionally, the first magnetic integrated structure integrates two inductors in the staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the second magnetic integrated structure integrates the inductor and the transformer in the double active bridge circuit in one magnetic core.
The beneficial effects of the invention are as follows: the invention integrates the staggered parallel bidirectional Buck/Boost circuit and the double active bridge circuit together through the shared primary full bridge, and reduces the number of switching tubes through multiplexing of the switching tubes, reduces the switching loss and reduces the cost. The direct-current voltage source and the storage battery power supply in the converter can realize energy bidirectional transmission, are easy to control the energy management of the system, and can improve the utilization rate of input energy. The invention effectively reduces the number of magnetic elements by utilizing the magnetic integration technology, reduces the iron loss, reduces the volume of the magnetic elements, improves the power density of the converter, and reduces the saturation of the integrated magnetic element without influencing the running state of each magnetic element after magnetic integration, thereby effectively reducing the loss of the converter.
Drawings
Fig. 1 is a schematic diagram of a magnetically integrated three-port DC-DC converter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the present invention using only one EE/EI type core to place a first inductor in the center leg and a second inductor in the left and right legs.
Fig. 3 is a schematic diagram of the structure of the present invention in which only one EE/EI type core is used to place the inductor in the center leg and the transformer in the left and right legs.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings: it should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation. (the invention will now be further explained and illustrated by means of a method in connection with the detailed description and the accompanying drawings)
Fig. 1 is a schematic diagram of a magnetic integration three-port DC-DC converter provided by the embodiment of the present invention, where the magnetic integration three-port DC-DC converter provided by the embodiment of the present invention includes a direct current voltage source Vin, an input filter capacitor Cin, a battery power source Vbat, a primary full bridge, a secondary full bridge, a first magnetic integration structure, a second magnetic integration structure, an output filter capacitor C0, and an output load R0; the whole circuit topology structure is integrated by a two-phase staggered parallel bidirectional Buck-Boost circuit and a double active bridge circuit, wherein the two-phase staggered parallel bidirectional Buck-Boost circuit is formed by a first magnetic integrated structure and a primary full bridge, and the double active bridge circuit is formed by the primary full bridge, a second magnetic integrated structure and a secondary full bridge; the direct-current voltage source Vin is connected with the input filter capacitor Cin; the primary full bridge comprises a switching tube S1, a switching tube S2, a switching tube S3 and a switching tube S4, wherein the source electrode of the switching tube S1 is connected with the drain electrode of the switching tube S2, the source electrode of the switching tube S3 is connected with the drain electrode of the switching tube S4, the drain electrode of the switching tube S1 is connected with the drain electrode of the switching tube S3, and the source electrode of the switching tube S2 is connected with the source electrode of the switching tube S4; the input filter capacitor Cin is connected with the drain electrode of the switching tube S1 and the drain electrode of the switching tube S3 of the primary full bridge, and the source electrode of the switching tube S2 and the source electrode of the switching tube S4; the secondary full bridge comprises a switching tube S5, a switching tube S6, a switching tube S7 and a switching tube S8, wherein the source electrode of the switching tube S5 is connected with the drain electrode of the switching tube S6, the source electrode of the switching tube S7 is connected with the drain electrode of the switching tube S8, the drain electrode of the switching tube S5 is connected with the drain electrode of the switching tube S7, and the source electrode of the switching tube S6 is connected with the source electrode of the switching tube S8; the magnetic integration structure one port 1 'is connected with the port 2' and then connected with the positive electrode of a storage battery power supply, the magnetic integration structure one port 3 is connected with the primary full-bridge side port A, and the magnetic integration structure one port 4 is connected with the primary full-bridge side port B; the positive electrode of the storage battery power supply Vbat is connected with a port 1 'and a port 2' of the magnetic integrated structure, and the negative electrode of the storage battery power supply Vbat is connected with the negative electrode of the direct current voltage source Vin; the magnetic integration structure two ports 1 are connected with the primary full-bridge side port A, the magnetic integration structure two ports 2 are connected with the primary full-bridge side port B, the magnetic integration structure two ports 3 are connected with the secondary full-bridge side port C, and the magnetic integration structure two ports 4 are connected with the secondary full-bridge side port D; the output filter capacitor C0 is connected with the drain electrode of the secondary full-bridge switching tube S5, the drain electrode of the switching tube S7, the source electrode of the secondary full-bridge switching tube S6 and the source electrode of the switching tube S8; the output load R0 is connected with the output filter capacitor C0.
The first magnetic integration structure and the second magnetic integration structure are the main content of the invention, and are respectively of two four-port structures, the structure of fig. 2 integrates two inductors in a staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the working states of the two inductors are not influenced after integration by adopting a decoupling integration method. The structure of fig. 3 integrates the inductor and the transformer in the double active bridge circuit in one magnetic core, and the problem that the two side columns of the magnetic core are saturated after the inductor and the transformer are magnetically integrated is effectively solved by adopting a novel winding method, so that the saturation of the magnetic core is reduced, and the utilization rate of the magnetic core is improved, so that the practical design and application are facilitated.
Fig. 2 is a schematic diagram of the structure of the present invention using only one EE/EI type core to place a first inductor in the center leg and a second inductor in the left and right legs. The first magnetic integration structure comprises an EE/EI magnetic core or a planar magnetic core, a first inductance winding L1, a second inductance first winding L21 and a second inductance second winding L22; the first inductance winding L1 is wound on the magnetic core center post III, the second inductance first winding L21 is wound on the magnetic core left side post I, and the second inductance second winding L22 is wound on the magnetic core right side post II; one end of the first inductance winding L1 is used as a port 1' of the magnetic integration structure, the other end of the first inductance winding L1 is used as a port 2' of the magnetic integration structure, one end of the second inductance first winding L21 is used as a port 3' of the magnetic integration structure, the other end of the second inductance first winding L21 is connected with the second inductance second winding L22, and the other end of the second inductance second winding L22 is used as a port 4 of the magnetic integration structure; the EE/EI magnetic core or the plane magnetic core is provided with an air gap.
The magnetic fluxes generated by the second inductance first winding and the second inductance second winding of the two side posts of the first magnetic integration structure are mutually offset in the middle post of the magnetic core, and the second inductance operation does not influence the first inductance operation; the magnetic flux generated by the first inductance winding cuts down the magnetic flux of the first winding of the second inductance on the left column I of the magnetic core, the magnetic flux generated by the first inductance winding strengthens the magnetic flux of the second winding of the second inductance on the right column II of the magnetic core, the influence of the operation of the first inductance on the operation of the second inductance is counteracted, and the decoupling integration of the two inductances is realized.
Fig. 3 is a schematic diagram of the structure of the present invention in which inductance is placed in the center leg and transformers are placed in the left and right side legs using only one EE/EI type core. The second magnetic integration structure comprises an EE/EI magnetic core or a planar magnetic core, a third inductance winding L3, a primary first winding NP1, a primary second winding NP2, a secondary first winding NS1 and a secondary second winding NS2; the third inductance winding L3 is wound on the magnetic core middle column III, the primary first winding NP1 is wound on the magnetic core left side column I, the primary second winding NP2 is wound on the magnetic core right side column II, the secondary first winding NS1 is wound on the magnetic core left side column I, and the secondary second winding NS2 is wound on the magnetic core right side column II; the homonymous end of the third inductance winding L3 is used as a magnetic integration structure two-port 1, the heteronymous end of the third inductance winding L3 is connected with the homonymous end of the primary side first winding NP1, the heteronymous end of the primary side first winding NP1 is connected with the homonymous end of the primary side second winding NP2, the heteronymous end of the primary side second winding NP2 is used as a magnetic integration structure two-port 2, the homonymous end of the secondary side first winding NS1 is used as a magnetic integration structure two-port 3, the heteronymous end of the secondary side first winding NS1 is connected with the homonymous end of the secondary side second winding NS2, and the heteronymous end of the secondary side second winding NS2 is used as a magnetic integration structure two-port 4; the EE/EI magnetic core or the plane magnetic core is provided with an air gap.
The magnetic flux generated by the third inductor of the second magnetic integration structure enhances the magnetic flux of the primary side first winding on the left side column I of the magnetic core, reduces the magnetic flux of the secondary side first winding on the left side column I of the magnetic core, reduces the magnetic flux of the primary side second winding on the right side column II of the magnetic core, enhances the magnetic flux of the secondary side second winding on the right side column II of the magnetic core, and mutually counteracts the influence of the operation of the third inductor on the operation of the transformer; through the reasonable design of the number of turns of the third inductor in the center column III of the magnetic core, magnetic fluxes generated by the primary side first winding, the primary side second winding, the secondary side first winding and the secondary side second winding offset each other, and the operation of the transformer does not influence the operation of the third inductor. The decoupling integration of the inductor and the transformer is realized, and the magnetic flux generated by the center post is maximum after magnetic integration, but the saturation degree is reduced because the EE/EI type magnetic core center post is wider than the side post.
The first magnetic integration structure and the second magnetic integration structure are applied to the three-port DC-DC converter, but are not limited thereto, and can be applied to the magnetic integration three-port DC-DC converter of other embodiments. All the converters and the magnetic integrated structures provided by the invention have natural deduction and change combination forms which are all in the protection.
The present invention is not limited to the above-described embodiments, and the above-described embodiments and descriptions are merely illustrative of the principles of the present invention, and various equivalent changes and modifications can be made without departing from the essential scope of the invention, which falls within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A magnetically integrated three-port DC-DC converter, comprising: the direct-current voltage source Vin, the input filter capacitor Cin, the storage battery power supply Vbat, a primary full bridge, a secondary full bridge, a first magnetic integrated structure, a second magnetic integrated structure, an output filter capacitor C0 and an output load R0; the first magnetic integrated structure is connected with the second magnetic integrated structure, the primary full bridge and the storage battery power supply Vbat respectively, the second magnetic integrated structure is connected with the first magnetic integrated structure, the primary full bridge and the secondary full bridge respectively, the storage battery power supply Vbat is connected with the direct-current voltage source Vin and the input filter capacitor Cin, and the secondary full bridge is connected with the output filter capacitor C0 and the output load R0;
The whole circuit topology structure is integrated by a two-phase staggered parallel bidirectional Buck-Boost circuit and a double active bridge circuit, wherein the two-phase staggered parallel bidirectional Buck-Boost circuit is formed by a first magnetic integrated structure and a primary full bridge, and the double active bridge circuit is formed by the primary full bridge, a second magnetic integrated structure and a secondary full bridge;
The direct-current voltage source Vin is connected with the input filter capacitor Cin;
The primary full bridge consists of a switching tube S1, a switching tube S2, a switching tube S3 and a switching tube S4, wherein the source electrode of the switching tube S1 is connected with the drain electrode of the switching tube S2, the source electrode of the switching tube S3 is connected with the drain electrode of the switching tube S4, the drain electrode of the switching tube S1 is connected with the drain electrode of the switching tube S3, and the source electrode of the switching tube S2 is connected with the source electrode of the switching tube S4; the input filter capacitor Cin is connected with the drain electrode of the switching tube S1 and the drain electrode of the switching tube S3 of the primary full bridge, and the source electrode of the switching tube S2 and the source electrode of the switching tube S4;
The secondary full bridge consists of a switching tube S5, a switching tube S6, a switching tube S7 and a switching tube S8, wherein the source electrode of the switching tube S5 is connected with the drain electrode of the switching tube S6, the source electrode of the switching tube S7 is connected with the drain electrode of the switching tube S8, the drain electrode of the switching tube S5 is connected with the drain electrode of the switching tube S7, and the source electrode of the switching tube S6 is connected with the source electrode of the switching tube S8; the port 1 'of the magnetic integration structure is connected with the port 2' and then connected with the positive electrode of a storage battery power supply, the port 3 'of the magnetic integration structure is connected with the primary full-bridge side port A, and the port 4' of the magnetic integration structure is connected with the primary full-bridge side port B;
the positive electrode of the storage battery power supply Vbat is connected with a port 1 'and a port 2' of the magnetic integrated structure, and the negative electrode of the storage battery power supply Vbat is connected with the negative electrode of the direct current voltage source Vin;
The magnetic integration structure two ports 1 are connected with the primary full-bridge side port A, the magnetic integration structure two ports 2 are connected with the primary full-bridge side port B, the magnetic integration structure two ports 3 are connected with the secondary full-bridge side port C, and the magnetic integration structure two ports 4 are connected with the secondary full-bridge side port D;
The output filter capacitor C0 is connected with the drain electrode of the secondary full-bridge switching tube S5, the drain electrode of the switching tube S7, the source electrode of the secondary full-bridge switching tube S6 and the source electrode of the switching tube S8;
The output load R0 is connected with the output filter capacitor C0;
The first magnetic integrated structure integrates two inductors in the staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the second magnetic integrated structure integrates the inductor and the transformer in the double-active-bridge circuit in one magnetic core.
2. A magnetically integrated three-port DC-DC converter according to claim 1, characterized in that the magnetically integrated structure one comprises an EE/EI core or a planar core, a first inductor winding L1, a second inductor first winding L21, a second inductor second winding L22;
The first inductance winding L1 is wound on a magnetic core middle column III, the second inductance first winding L21 is wound on a magnetic core left side column I, and the second inductance second winding L22 is wound on a magnetic core right side column II;
One end of the first inductance winding L1 is used as a port 1' of the magnetic integration structure, the other end of the first inductance winding L1 is used as a port 2' of the magnetic integration structure, one end of the second inductance first winding L21 is used as a port 3' of the magnetic integration structure, the other end of the second inductance first winding L21 is connected with the second inductance second winding L22, and the other end of the second inductance second winding L22 is used as a port 4 of the magnetic integration structure;
The EE/EI magnetic core or the plane magnetic core is provided with an air gap.
3. A magnetically integrated three-port DC-DC converter according to claim 1, characterized in that the second magnetic integrated structure comprises an EE/EI core or a planar core, a third inductor winding L3, a primary first winding NP1, a primary second winding NP2, a secondary first winding NS1, a secondary second winding NS2;
The third inductance winding L3 is wound on a magnetic core middle column III, the primary first winding NP1 is wound on a magnetic core left column I, the primary second winding NP2 is wound on a magnetic core right column II, the secondary first winding NS1 is wound on a magnetic core left column I, and the secondary second winding NS2 is wound on a magnetic core right column II;
The homonymous end of the third inductance winding L3 is used as a magnetic integration structure two-port 1, the heteronymous end of the third inductance winding L3 is connected with the homonymous end of the primary side first winding NP1, the heteronymous end of the primary side first winding NP1 is connected with the homonymous end of the primary side second winding NP2, the heteronymous end of the primary side second winding NP2 is used as a magnetic integration structure two-port 2, the homonymous end of the secondary side first winding NS1 is used as a magnetic integration structure two-port 3, the heteronymous end of the secondary side first winding NS1 is connected with the homonymous end of the secondary side second winding NS2, and the heteronymous end of the secondary side second winding NS2 is used as a magnetic integration structure two-port 4;
The EE/EI magnetic core or the plane magnetic core is provided with an air gap.
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