CN112737348A - Magnetic integration three-port DC-DC converter - Google Patents
Magnetic integration three-port DC-DC converter Download PDFInfo
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- CN112737348A CN112737348A CN202110089183.9A CN202110089183A CN112737348A CN 112737348 A CN112737348 A CN 112737348A CN 202110089183 A CN202110089183 A CN 202110089183A CN 112737348 A CN112737348 A CN 112737348A
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- 230000010354 integration Effects 0.000 title abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 17
- 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 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 118
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change 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
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
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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 following components: the magnetic integrated circuit comprises a direct-current voltage source, an input filter capacitor, a storage battery power supply, a primary side full bridge, a secondary side full bridge, a first magnetic integrated structure, a second magnetic integrated structure, an output filter capacitor and an output load; the whole circuit topological structure is obtained by integrating two-phase staggered parallel bidirectional Buck-Boost circuits and double active bridge circuits, the two-phase staggered parallel bidirectional Buck-Boost circuits are formed by the magnetic integrated structure I and the primary side full bridge, and the double active bridge circuits are formed by the primary side full bridge, the magnetic integrated structure II and the secondary side full bridge; the first magnetic integrated structure integrates two inductors in a staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the second magnetic integrated structure integrates an inductor and a transformer in a double-active bridge circuit in one magnetic core. The invention integrates the staggered parallel bidirectional Buck/Boost circuit and the double active bridge circuit through a common primary side full bridge, and reduces the number of switching tubes, switching loss and cost through multiplexing of the switching tubes.
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 basis for human survival and social development, at present, the earth energy is gradually in shortage, the environmental pollution is serious, the climate change is severe, and in order to solve the series of problems, the human pays more and more attention to new energy technologies such as photovoltaic power generation and wind power generation. Meanwhile, in order to better utilize energy, renewable energy, other energy and an energy storage system are often combined to form a renewable energy combined power supply system, such as a photovoltaic-storage battery combined power supply system, the introduction of a storage battery improves the utilization rate of system energy, improves the operation efficiency of the system, and a multi-port converter is used for connecting each unit in the system to realize stable and efficient transmission of energy. The existing combined power supply system is complex in structure, a power conversion unit is correspondingly added for each port, the system cost is high, and the reliability is low. Through multiplexing of the switch tube, the three-port DC-DC converter replaces the existing converter structure, the circuit structure can be simplified, and the cost can be reduced. However, the increase of magnetic elements and the increase of the size and weight of the converter are brought along with the increase of the magnetic elements, which results in large system loss, low efficiency and is not beneficial to the improvement of the power density of the converter. Through carrying out magnetic integration on each discrete magnetic component in the three-port DC-DC converter, the size and the weight of a magnetic element can be effectively reduced, the system loss is reduced, and the three-port DC-DC converter has important significance for improving the performance and the power density of the three-port converter. Most of the prior art carries out magnetic integration on an isolated or non-isolated converter, and has less magnetic integration on a switch tube multiplexing type three-port DC-DC converter.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnetic integration three-port DC-DC converter to realize the magnetic integration of a switch 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 the loss of a system.
The invention provides a magnetic integrated three-port DC-DC converter, which comprises a DC voltage source VinAn input filter capacitor CinStorage battery power supply VbatOriginal, originalSide full bridge, secondary side full bridge, magnetic integrated structure I, magnetic integrated structure II and output filter capacitor C0Output load R0(ii) a The first magnetic integrated structure is respectively connected with the second magnetic integrated structure, the primary side full bridge and the storage battery power supply by VbatThe magnetic integrated structure II is respectively connected with the magnetic integrated structure I, the primary side full bridge and the secondary side full bridge, and the storage battery power supply VbatAnd a DC voltage source VinAn input filter capacitor CinConnected, the secondary side full bridge and an output filter capacitor C0Output load R0Connecting; the whole circuit topological structure is obtained by integrating two-phase staggered parallel bidirectional Buck-Boost circuits and double active bridge circuits, the two-phase staggered parallel bidirectional Buck-Boost circuits are formed by the magnetic integrated structure I and the primary side full bridge, and the double active bridge circuits are formed by the primary side full bridge, the magnetic integrated structure II and the secondary side full bridge; the DC voltage source VinSame-input filter capacitor CinConnecting; the primary side full bridge comprises a switching tube S1Switch tube S2Switch tube S3Switch tube S4Switching tube S1Source electrode of the same switch tube S2Is connected with the drain electrode of the switching tube S3Source electrode of the same switch tube S4Is connected with the drain electrode of the switching tube S1The drain electrode of the transistor is connected with the switch tube S3Is connected with the drain electrode of the switching tube S2Source electrode of the same switch tube S4The source electrodes of the first and second transistors are connected; the input filter capacitor CinSwitch tube S of same primary side full bridge1Drain electrode, switching tube S3Drain and switching tube S2Source electrode, switch tube S4The source electrodes are connected; the secondary side full bridge comprises a switching tube S5Switch tube S6Switch tube S7Switch tube S8Switching tube S5Source electrode of the same switch tube S6Is connected with the drain electrode of the switching tube S7Source electrode of the same switch tube S8Is connected with the drain electrode of the switching tube S5The drain electrode of the transistor is connected with the switch tube S7Is connected with the drain electrode of the switching tube S6Source electrode of the same switch tube S8The source electrodes of the first and second transistors are connected; one port 1 'of the magnetic integrated structure is connected with the port 2' and then is connected with the anode of the storage battery power supply, and the magnetic integrated structureOne port 3 is connected with the port A of the primary side full bridge side, and one port 4 of the magnetic integrated structure is connected with the port B of the primary side full bridge side; the storage battery power supply VbatThe positive pole of the magnetic pole is connected with a port 1 'and a port 2' of the magnetic integrated structure, and a storage battery power supply VbatThe negative electrode of the DC voltage source is the same as the DC voltage source VinThe negative electrodes are connected; the magnetic integrated structure comprises a magnetic integrated structure, a magnetic integrated structure and a magnetic integrated structure, wherein a second port 1 of the magnetic integrated structure is connected with a primary side full-bridge side port A, a second port 2 of the magnetic integrated structure is connected with a primary side full-bridge side port B, a second port 3 of the magnetic integrated structure is connected with a secondary side full-bridge side port C, and a second port 4 of the magnetic integrated structure is connected with a secondary side full-bridge side port D; the output filter capacitor C0Same-secondary side full-bridge switch tube S5Drain electrode of (1), and switching tube S7Drain and secondary side full bridge switch tube S6Source electrode and switch tube S8The source electrodes of the first and second transistors are connected; the output load R0Same-output filter capacitor C0Are connected.
Optionally, the first magnetic integrated structure comprises an EE/EI magnetic core or a planar magnetic core, and a first inductance winding L1A first winding L of a second inductor21A second inductor second winding L22(ii) a First inductor winding L1Wound on the center pillar III of the magnetic core, and a first winding L of a second inductor21A second inductor winding L wound on the left leg I of the magnetic core22Winding on the magnetic core right side column II; wherein the first inductance winding L11One end of the first inductance winding L is used as a port 1' of the magnetic integrated structure11The other end is used as a port 2' of the magnetic integrated structure, and a first winding L of a second inductor21One end of the first inductor is used as a port 3' of the magnetic integrated structure, and the first winding L of the second inductor21The other end is connected with a second winding L of a second inductor22Connected, second inductance second winding L22The other end is used as a port 4' of the magnetic integrated structure; and air gaps are formed in three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
Optionally, the second magnetic integrated structure includes an EE/EI magnetic core or a planar magnetic core, and a third inductance winding L3Primary side first winding NP1Primary side secondary winding NP2Secondary side first winding NS1Secondary side second winding NS2(ii) a Third inductor winding L3Wound on the center pole III of the magnetic core and having a primary side first winding NP1A primary secondary winding N wound on the left leg I of the magnetic coreP2Wound on the right side post II of the magnetic core and provided with a first winding N on the secondary sideS1A secondary winding N wound on the left side column I of the magnetic coreS2Winding on the magnetic core right side column II; wherein the third inductance winding L3The same name end of the magnetic integrated structure is used as a second port 1 of the magnetic integrated structure, and a third inductance winding L3First winding N with different name ends and same primary sideP1Are connected with the same name end of the primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The synonym end of the magnetic integrated structure is used as a two-port 2 of the magnetic integrated structure, and a first winding N on the secondary sideS1The same name end of the magnetic integrated structure is used as a two-port 3 of the magnetic integrated structure, and a first winding N on the secondary sideS1Second winding N with different name end and same secondary sideS2Are connected with the same name end, and a secondary side second winding NS2The synonym end of the magnetic integrated structure is used as a second port 4 of the magnetic integrated structure; and air gaps are formed in three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
Optionally, the whole circuit topology is obtained by integrating two phase interleaved parallel bidirectional Buck-Boost circuits and a double active bridge circuit, the two phase interleaved parallel bidirectional Buck-Boost circuits are formed by the first magnetic integrated structure and the primary side full bridge, and the double active bridge circuit is formed by the primary side full bridge, the second magnetic integrated structure and the secondary side full bridge.
Optionally, the first magnetic integrated structure integrates two inductors in a staggered parallel bidirectional Buck-Boost circuit in one magnetic core, and the second magnetic integrated structure integrates an inductor and a transformer in a double-active bridge circuit in one magnetic core.
The invention has the beneficial effects that: the invention integrates the staggered parallel bidirectional Buck/Boost circuit and the double active bridge circuit through a common primary side full bridge, and reduces the number of switching tubes, switching loss and cost through multiplexing of the switching tubes. The direct-current voltage source and the storage battery power source in the converter can realize energy bidirectional transmission, so that the energy management control of the system is easy, and the utilization rate of input energy can be improved. The invention effectively reduces the number of magnetic elements, reduces the iron loss, reduces the volume of the magnetic elements and improves the power density of the converter by utilizing the magnetic integration technology, and the operating state of each magnetic element after magnetic integration is not influenced, thereby reducing the saturation of the integrated magnetic element and 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 in which a first inductor is disposed in a center pillar and a second inductor is disposed in left and right pillars using only one EE/EI type core.
Fig. 3 is a schematic diagram of the structure of the present invention in which an inductor is disposed in a center pillar and a transformer is disposed in left and right pillars using only one EE/EI type magnetic core.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: it should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention. (the invention will now be further explained and illustrated by means of the description and the figures)
Fig. 1 is a schematic diagram of a magnetically integrated three-port DC-DC converter according to an embodiment of the present invention, where the magnetically integrated three-port DC-DC converter includes a DC voltage source VinAn input filter capacitor CinStorage battery power supply VbatPrimary side full bridge, secondary side full bridge, magnetic integrated structure I, magnetic integrated structure II and output filter capacitor C0Output load R0(ii) a The whole circuit topological structure is obtained by integrating two-phase staggered parallel bidirectional Buck-Boost circuits and double active bridge circuits, the two-phase staggered parallel bidirectional Buck-Boost circuits are formed by the magnetic integrated structure I and the primary side full bridge, and the double active bridge circuits are formed by the primary side full bridge, the magnetic integrated structure II and the secondary side full bridge; the DC voltage source VinSame-input filter capacitor CinConnecting; the primary side full bridge comprises a switching tube S1Switch tube S2Switch tube S3Switch tube S4Switching tube S1Source electrode of the same switch tubeS2Is connected with the drain electrode of the switching tube S3Source electrode of the same switch tube S4Is connected with the drain electrode of the switching tube S1The drain electrode of the transistor is connected with the switch tube S3Is connected with the drain electrode of the switching tube S2Source electrode of the same switch tube S4The source electrodes of the first and second transistors are connected; the input filter capacitor CinSwitch tube S of same primary side full bridge1Drain electrode, switching tube S3Drain and switching tube S2Source electrode, switch tube S4The source electrodes are connected; the secondary side full bridge comprises a switching tube S5Switch tube S6Switch tube S7Switch tube S8Switching tube S5Source electrode of the same switch tube S6Is connected with the drain electrode of the switching tube S7Source electrode of the same switch tube S8Is connected with the drain electrode of the switching tube S5The drain electrode of the transistor is connected with the switch tube S7Is connected with the drain electrode of the switching tube S6Source electrode of the same switch tube S8The source electrodes of the first and second transistors are connected; a port 1 'of the magnetic integrated structure is connected with a port 2' and then connected with the anode of the storage battery power supply, a port 3 of the magnetic integrated structure is connected with a port A of the primary side full-bridge side, and a port 4 of the magnetic integrated structure is connected with a port B of the primary side full-bridge side; the storage battery power supply VbatThe positive pole of the magnetic pole is connected with a port 1 'and a port 2' of the magnetic integrated structure, and a storage battery power supply VbatThe negative electrode of the DC voltage source is the same as the DC voltage source VinThe negative electrodes are connected; the magnetic integrated structure comprises a magnetic integrated structure, a magnetic integrated structure and a magnetic integrated structure, wherein a second port 1 of the magnetic integrated structure is connected with a primary side full-bridge side port A, a second port 2 of the magnetic integrated structure is connected with a primary side full-bridge side port B, a second port 3 of the magnetic integrated structure is connected with a secondary side full-bridge side port C, and a second port 4 of the magnetic integrated structure is connected with a secondary side full-bridge side port D; the output filter capacitor C0Same-secondary side full-bridge switch tube S5Drain electrode of (1), and switching tube S7Drain and secondary side full bridge switch tube S6Source electrode and switch tube S8The source electrodes of the first and second transistors are connected; the output load R0Same-output filter capacitor C0Are connected.
The first magnetic integrated structure and the second magnetic integrated structure are respectively of two four-port structures, two inductors in a staggered parallel bidirectional Buck-Boost circuit are integrated in a magnetic core in the structure shown in the figure 2, a decoupling integration method is adopted, and the working states of the two inductors are not influenced by each other after integration. The structure of fig. 3 integrates the inductor and the transformer in the double-active-bridge circuit in one magnetic core, and the novel winding method is adopted to effectively solve the problem that the two side columns of the magnetic core are saturated after the inductor and the transformer are magnetically integrated, so that the saturation of the magnetic core is reduced, the utilization rate of the magnetic core is improved, and the practical design and application are facilitated.
Fig. 2 is a schematic diagram of the structure of the present invention in which a first inductor is disposed in a center pillar and a second inductor is disposed in left and right pillars using only one EE/EI type core. The first magnetic integrated structure comprises an EE/EI magnetic core or a planar magnetic core and a first inductance winding L1A first winding L of a second inductor21A second inductor second winding L22(ii) a First inductor winding L1Wound on the center pillar III of the magnetic core, and a first winding L of a second inductor21A second inductor winding L wound on the left leg I of the magnetic core22Winding on the magnetic core right side column II; wherein the first inductance winding L11One end of the first inductance winding L is used as a port 1' of the magnetic integrated structure11The other end is used as a port 2' of the magnetic integrated structure, and a first winding L of a second inductor21One end of the first inductor is used as a port 3' of the magnetic integrated structure, and the first winding L of the second inductor21The other end is connected with a second winding L of a second inductor22Connected, second inductance second winding L22The other end is used as a port 4' of the magnetic integrated structure; and air gaps are formed in three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
Magnetic fluxes generated by the first windings of the second inductors and the second windings of the second inductors on the two side columns of the first magnetic integrated structure are offset with each other in the center column of the magnetic core, and the operation of the second inductors does not influence the operation of the first inductors; the magnetic flux of the first inductor winding on the left side column I of the magnetic core is reduced by the magnetic flux of the first inductor winding on the second inductor winding, the magnetic flux of the second inductor winding on the right side column II of the magnetic core is enhanced by the magnetic flux of the first inductor winding, the influence of the operation of the first inductor on the operation of the second inductor is mutually offset, and the decoupling integration of the two inductors is realized.
FIG. 3 is a transformer of the present invention using only one EE/EI type core to place the inductive inductor in the center legSchematic structural diagrams of left and right side columns. The second magnetic integrated structure comprises an EE/EI magnetic core or a plane magnetic core and a third inductance winding L3Primary side first winding NP1Primary side secondary winding NP2Secondary side first winding NS1Secondary side second winding NS2(ii) a Third inductor winding L3Wound on the center pole III of the magnetic core and having a primary side first winding NP1A primary secondary winding N wound on the left leg I of the magnetic coreP2Wound on the right side post II of the magnetic core and provided with a first winding N on the secondary sideS1A secondary winding N wound on the left side column I of the magnetic coreS2Winding on the magnetic core right side column II; wherein the third inductance winding L3The same name end of the magnetic integrated structure is used as a second port 1 of the magnetic integrated structure, and a third inductance winding L3First winding N with different name ends and same primary sideP1Are connected with the same name end of the primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The synonym end of the magnetic integrated structure is used as a two-port 2 of the magnetic integrated structure, and a first winding N on the secondary sideS1The same name end of the magnetic integrated structure is used as a two-port 3 of the magnetic integrated structure, and a first winding N on the secondary sideS1Second winding N with different name end and same secondary sideS2Are connected with the same name end, and a secondary side second winding NS2The synonym end of the magnetic integrated structure is used as a second port 4 of the magnetic integrated structure; and air gaps are formed in three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
The magnetic flux generated by the third inductor of the second magnetic integrated structure strengthens 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, strengthens 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 middle column III of the magnetic core, the 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 counteract the magnetic flux of the third inductor in the middle column III of the magnetic core, 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, the magnetic flux generated by the center post after the magnetic integration is maximum, but the saturation is reduced because the center post of the EE/EI type magnetic core is wider than the side posts.
The first magnetic integrated structure and the second magnetic integrated structure are applied to the three-port DC-DC converter, but are not limited thereto, and may be applied to the magnetic integrated three-port DC-DC converter of other embodiments. All the transducers and magnetic integrated structures proposed by the present invention are protected in their natural deduction and variation combinations.
The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various equivalent changes and modifications may be made without departing from the basic contents of the present invention, and these equivalent changes and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A magnetically integrated three-port DC-DC converter, comprising: DC voltage source VinAn input filter capacitor CinStorage battery power supply VbatPrimary side full bridge, secondary side full bridge, magnetic integrated structure I, magnetic integrated structure II and output filter capacitor C0Output load R0(ii) a The first magnetic integrated structure is respectively connected with the second magnetic integrated structure, the primary side full bridge and the storage battery power supply by VbatThe magnetic integrated structure II is respectively connected with the magnetic integrated structure I, the primary side full bridge and the secondary side full bridge, and the storage battery power supply VbatAnd a DC voltage source VinAn input filter capacitor CinConnected, the secondary side full bridge and an output filter capacitor C0Output load R0Connecting;
the whole circuit topological structure is obtained by integrating two-phase staggered parallel bidirectional Buck-Boost circuits and double active bridge circuits, the two-phase staggered parallel bidirectional Buck-Boost circuits are formed by the magnetic integrated structure I and the primary side full bridge, and the double active bridge circuits are formed by the primary side full bridge, the magnetic integrated structure II and the secondary side full bridge;
the DC voltage source VinSame-input filter capacitor CinConnecting;
the primary side full bridge is composed ofSwitch tube S1Switch tube S2Switch tube S3Switch tube S4Composition of, the switching tube S1Source electrode of the same switch tube S2Is connected with the drain electrode of the switching tube S3Source electrode of the same switch tube S4Is connected with the drain electrode of the switching tube S1The drain electrode of the transistor is connected with the switch tube S3Is connected with the drain electrode of the switching tube S2Source electrode of the same switch tube S4The source electrodes of the first and second transistors are connected;
the input filter capacitor CinSwitch tube S of same primary side full bridge1Drain electrode, switching tube S3Drain and switching tube S2Source electrode, switch tube S4The source electrodes are connected;
the secondary side full bridge is composed of a switch tube S5Switch tube S6Switch tube S7Switch tube S8Composition of, the switching tube S5Source electrode of the same switch tube S6Is connected with the drain electrode of the switching tube S7Source electrode of the same switch tube S8Is connected with the drain electrode of the switching tube S5The drain electrode of the transistor is connected with the switch tube S7Is connected with the drain electrode of the switching tube S6Source electrode of the same switch tube S8The source electrodes of the first and second transistors are connected;
a port 1 'of the magnetic integrated structure is connected with a port 2' and then connected with the anode of a storage battery power supply, a port 3 'of the magnetic integrated structure is connected with a port A of the primary side full-bridge side, and a port 4' of the magnetic integrated structure is connected with a port B of the primary side full-bridge side;
the storage battery power supply VbatThe positive pole of the magnetic pole is connected with a port 1 'and a port 2' of the magnetic integrated structure, and the storage battery power supply VbatThe negative electrode of the DC voltage source is the same as the DC voltage source VinThe negative electrodes are connected;
the magnetic integrated structure comprises a magnetic integrated structure, a magnetic integrated structure and a magnetic sensor, wherein a magnetic integrated structure two port 1 is connected with a primary side full-bridge side port A, a magnetic integrated structure two port 2 is connected with a primary side full-bridge side port B, a magnetic integrated structure two port 3 is connected with a secondary side full-bridge side port C, and a magnetic integrated structure two port 4 is connected with a secondary side full-bridge side port D;
the output filter capacitor C0Same-secondary side full-bridge switch tube S5Drain electrode of (1), and switching tube S7Drain and secondary side full bridge switch tube S6Source electrode and switch tube S8The source electrodes of the first and second transistors are connected;
the output load R0Same-output filter capacitor C0Are connected.
2. A magnetically integrated three-port DC-DC converter as claimed in claim 1, wherein the magnetically integrated structure comprises an EE/EI core or a planar core, the first inductor winding L1A first winding L of a second inductor21A second inductor second winding L22；
The first inductance winding L1Wound on the center pillar III of the magnetic core, and the first winding L of the second inductor21Wound on the left side column I of the magnetic core, and a second winding L of the second inductor22Winding on the magnetic core right side column II;
wherein the first inductance winding L11One end of the first inductance winding L is used as a port 1' of the magnetic integrated structure11The other end is used as a port 2' of the magnetic integrated structure, and a first winding L of a second inductor21One end of the first inductor is used as a port 3' of the magnetic integrated structure, and the first winding L of the second inductor21The other end is connected with a second winding L of a second inductor22Connected, second inductance second winding L22The other end is used as a port 4' of the magnetic integrated structure;
and air gaps are formed in the three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
3. A magnetically integrated three-port DC-DC converter as claimed in claim 1, wherein the magnetically integrated structure two comprises EE/EI magnetic core or planar magnetic core, third inductive winding L3Primary side first winding NP1Primary side secondary winding NP2Secondary side first winding NS1Secondary side second winding NS2；
The third inductance winding L3Wound on a center pillar III of the magnetic core, and a primary side first winding NP1Wound on the left side post I of the magnetic core, and the primary side secondary winding NP2Wound on the right side post II of the magnetic core, theSecondary side first winding NS1Wound on the left side column I of the magnetic core, and the secondary side secondary winding NS2Winding on the magnetic core right side column II;
wherein the third inductance winding L3The same name end of the magnetic integrated structure is used as a second port 1 of the magnetic integrated structure, and a third inductance winding L3First winding N with different name ends and same primary sideP1Are connected with the same name end of the primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The synonym end of the magnetic integrated structure is used as a two-port 2 of the magnetic integrated structure, and a first winding N on the secondary sideS1The same name end of the magnetic integrated structure is used as a two-port 3 of the magnetic integrated structure, and a first winding N on the secondary sideS1Second winding N with different name end and same secondary sideS2Are connected with the same name end, and a secondary side second winding NS2The synonym end of the magnetic integrated structure is used as a second port 4 of the magnetic integrated structure;
and air gaps are formed in the three magnetic columns of the EE/EI magnetic core or the planar magnetic core.
4. A magnetically integrated three-port DC-DC converter according to claim 1, wherein the first magnetically integrated structure integrates two inductors in a cross-coupled bidirectional Buck-Boost circuit in one magnetic core, and the second magnetically integrated structure integrates an inductor and a transformer in a dual active bridge circuit in one magnetic core.
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