CN221202368U - Power conversion circuit, vehicle-mounted charger and automobile - Google Patents

Abstract

The application relates to the technical field of power conversion, and discloses a power conversion circuit, a vehicle-mounted charger and an automobile, wherein the circuit comprises: the first conversion circuit and the second conversion circuit are electrically connected with the first conversion circuit; the first conversion circuit and the second conversion circuit are internally provided with magnetic devices, and the magnetic devices comprise: the first transformer coil and the second inductance coil are positioned in the first conversion circuit, the second transformer coil and the second inductance coil are positioned in the second conversion circuit, and the magnetic cores are distributed in the first conversion circuit and the second conversion circuit; the magnetic core comprises a first common magnetic pillar arranged between the first transformer coil and the first inductance coil, a second common magnetic pillar arranged between the first inductance coil and the second inductance coil, and a third common magnetic pillar arranged between the second inductance coil and the second transformer coil. The application improves the power density.

Description

Power conversion circuit, vehicle-mounted charger and automobile

Technical Field

The utility model relates to the technical field of power conversion, in particular to a power conversion circuit, a vehicle-mounted charger and an automobile.

Background

Along with the development of society, the more and more vehicle-mounted chargers are used on automobiles, users hope that the vehicle-mounted chargers can work normally and meanwhile use cost of magnetic devices in the vehicle-mounted chargers is reduced, and therefore higher requirements are also provided for the use of the magnetic devices in the vehicle-mounted chargers.

The use of magnetic devices in a conventional vehicle-mounted charger is shown in fig. 2, and an OBC (On board charger) transformer, an OBC inductor, a DCDC (Direct Current) transformer and a DCDC inductor are respectively magnetically integrated, wherein fig. 2 is a schematic structural diagram of an existing power conversion circuit, and the integrated mode has a great defect that two independent integrated magnetic devices, namely an OBC magnetic device and a DCDC magnetic device, are present, so that magnetic cores in the two integrated magnetic devices cannot be utilized to the maximum extent, and further the power density is affected.

Disclosure of utility model

The utility model mainly aims to provide a power conversion circuit and a vehicle-mounted charger, and aims to solve the problem of how to maximally utilize a magnetic core in an integrated magnetic device so as to improve power density.

In order to achieve the above object, the present utility model provides a power conversion circuit, which includes a first conversion circuit and a second conversion circuit electrically connected to the first conversion circuit; magnetic devices are arranged in the first conversion circuit and the second conversion circuit, and the magnetic devices comprise: a first transformer coil, a second inductor coil, a second transformer coil and a second inductor coil in the second conversion circuit, and magnetic cores distributed in the first conversion circuit and the second conversion circuit;

The magnetic core comprises a first common magnetic pillar arranged between the first transformer coil and the first inductance coil, a second common magnetic pillar arranged between the first inductance coil and the second inductance coil, and a third common magnetic pillar arranged between the second inductance coil and the second transformer coil.

Optionally, the magnetic core further includes a first winding center pillar, a second winding center pillar, a third winding center pillar and a fourth winding center pillar that are sequentially arranged at intervals, the first transformer coil is wound on the first winding center pillar, the first inductance coil is wound on the second winding center pillar, the second inductance coil is wound on the third winding center pillar, and the second transformer coil is wound on the fourth winding center pillar.

Optionally, an air gap is present below at least one of the winding center posts, or an air gap is present above at least one of the winding center posts.

Optionally, at least one winding center post comprises at least two sub-winding center posts, and an air gap exists between two adjacent sub-winding center posts.

Optionally, the magnetic core includes a first magnetic core, a second magnetic core, a third magnetic core, and a fourth magnetic core that are sequentially stacked in the same direction, the first magnetic core includes the first winding center post and the first common magnetic post, the second magnetic core includes the second winding center post and the second common magnetic post, the third magnetic core includes the third winding center post and the third common magnetic post, and the fourth magnetic core includes the fourth winding center post.

Optionally, the magnetic core further includes a fifth magnetic core, where the fifth magnetic core is disposed adjacent to the first magnetic core and forms a closed magnetic core loop.

Optionally, the fifth magnetic core is an E-type magnetic core or a U-type magnetic core, and a middle post of the fifth magnetic core is arranged opposite to the middle post of the first winding so as to form a closed magnetic core loop; or alternatively, the first and second heat exchangers may be,

The fifth magnetic core is an I-shaped magnetic core, and the fifth magnetic core is arranged adjacent to the first winding center post so as to form a closed magnetic core loop.

Optionally, the first transformer coil includes a primary coil and a secondary coil;

When the fifth magnetic core is an E-shaped magnetic core or a U-shaped magnetic core, the primary coil is wound on a middle column of the fifth magnetic core, and the secondary coil is wound on a middle column of the first winding; or alternatively, the first and second heat exchangers may be,

The primary coil is wound on the first winding center post, and the secondary coil is wound on the center post of the fifth magnetic core.

In addition, the application also provides a vehicle-mounted charger, which comprises the power conversion circuit.

In addition, the application also provides an automobile, which comprises an automobile charging part and the vehicle-mounted charger, and the vehicle-mounted charger is arranged in the automobile charging part.

The application provides a power conversion circuit which comprises a first conversion circuit, a first transformer coil, a first inductance coil, a second transformer coil, a magnetic core and a second conversion circuit, wherein the first conversion circuit is connected with the second conversion circuit; the magnetic core comprises a first common magnetic pillar arranged between the first transformer coil and the first inductance coil, a second common magnetic pillar arranged between the first inductance coil and the second inductance coil, and a third common magnetic pillar arranged between the second inductance coil and the second transformer coil. The first transformer coil, the first inductance coil, the second inductance coil and the second transformer coil are integrated and shared through the shared magnetic column, so that the phenomenon that two independent integrated magnetic devices exist in the prior art and the magnetic cores in the two integrated magnetic devices cannot be utilized to the greatest extent is avoided, the two independent integrated magnetic devices are further integrated in a shared magnetic column mode, and the power density is improved.

Drawings

FIG. 1 is a schematic diagram of a power conversion circuit according to the present utility model;

FIG. 2 is a schematic diagram of a conventional power conversion circuit;

FIG. 3 is a schematic diagram of a circuit connection of the power conversion circuit of the present utility model;

FIG. 4 is a schematic diagram of another circuit connection of the power conversion circuit of the present utility model;

FIG. 5 is a schematic diagram of a magnetic core according to the present utility model;

FIG. 6 is a schematic view of another embodiment of a magnetic core according to the present utility model;

Fig. 7 is a schematic view of the winding center post and air gap of the magnetic core of the present utility model.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	First conversion circuit	200	Second conversion circuit
310	First transformer coil	320	First inductance coil
				330	Second inductance coil	340	Second transformer coil
350	Magnetic core	Q1-Q14	First switching tube-fourteenth switching tube
				C1-C6	First capacitor-sixth capacitor	360	First common magnetic column
370	Second common magnetic column	380	Third shared magnetic column

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

The utility model provides a power conversion circuit, referring to the schematic structural diagram of the power conversion circuit in fig. 1, the power conversion circuit comprises a first conversion circuit 100 and a second conversion circuit 200 electrically connected with the first conversion circuit 100; magnetic devices are disposed in the first conversion circuit 100 and the second conversion circuit 200, and the magnetic devices include: a first transformer coil 310, a second inductor coil 320 located in the first conversion circuit 100, a second transformer coil 340 and a second inductor coil 330 located in the second conversion circuit 200, and magnetic cores 350 distributed in the first conversion circuit 100 and the second conversion circuit 200;

The magnetic core 350 includes a first common leg 360 disposed between the first transformer coil 310 and the first inductor coil 320, a second common leg 370 disposed between the first inductor coil 320 and the second inductor coil 330, and a third common leg 380 disposed between the second inductor coil 330 and the second transformer coil 340.

The power conversion circuit can be a charger circuit in the automobile, and can also be other power conversion circuits requiring a plurality of transformation coils and induction coils, wherein the circuit in the charger in the automobile is taken as an example, the two-in-one charger circuit comprises an OBC circuit and a DCDC circuit, and magnetic devices of the OBC circuit and the DCDC circuit comprise PFC (Power Factor Correction, power correction) inductors, an OBC transformer, an OBC inductor, a DCDC transformer and a DCDC inductor. Among them, a common technology is to magnetically integrate an OBC transformer and an OBC inductor in an OBC circuit to realize magnetic circuit sharing, and magnetically integrate a DCDC transformer and a DCDC inductor in a DCDC circuit to realize magnetic circuit sharing, as shown in fig. 2. And then can effectively reduce OBC magnetic device and DCDC magnetic device's size and magnetic core quantity to can promote the power density of charger. However, in the two-in-one vehicle-mounted charger including the OBC circuit and the DCDC circuit, the OBC magnetic device and the DCDC magnetic device occupy a relatively large space, which has become a bottleneck for improving the power density.

Based on the prior art, only the OBC transformer and the OBC inductor or the DCDC transformer and the DCDC inductor are considered to be integrated, the integration of the OBC circuit and the magnetic piece of the DCDC circuit is not considered, the volume of the magnetic core is not utilized to the maximum extent, and the further improvement of the power density is affected. In order to further improve the power density of the two-in-one vehicle-mounted charger, the application provides an integration mode (magnetic circuit sharing technology) of an OBC magnetic device and a DCDC magnetic device.

In this embodiment, on the premise that the magnetic circuit is shared by the OBC transformer and the OBC inductor, the magnetic circuit is further integrated by the DCDC transformer and the DCDC inductor, and it is proposed that the magnetic core 350 has the first shared magnetic pole 360 between the first transformer coil 310 and the first inductor coil 320, the second shared magnetic pole 370 between the first inductor coil 320 and the second inductor coil 330, and the third shared magnetic pole 380 between the second inductor coil 330 and the second transformer coil 340, wherein the first conversion circuit 100 may be an OBC circuit or a DCDC circuit, that is, one of the two circuits is an OBC circuit, and the other circuit is a DCDC circuit, that is, when the first conversion circuit 100 is an OBC circuit, the second conversion circuit 200 is also a DCDC circuit, the first transformer coil 310 is an OBC inductor coil, the first inductor coil 320 is a c inductor coil, the second inductor coil 330 is a DCDC inductor coil, the second inductor coil 340 is a DCDC inductor coil, and the first conversion circuit 200 is a DCDC inductor coil, and the second inductor coil is a DCDC inductor coil, and the first inductor coil is a DCDC coil, and the second inductor coil is a DCDC coil. The magnetic circuits generated by the adjacent coils and the magnetic core 350 during operation share one magnetic column, so that the OBC magnetic devices and the DCDC magnetic devices can be integrated together, the number of the magnetic cores required by the magnetic devices is further reduced, the sizes of the OBC magnetic devices and the DCDC magnetic devices are reduced, the power density of the vehicle-mounted charger is further improved, and the use cost of the magnetic devices in the vehicle-mounted charger is reduced.

Referring to fig. 3, fig. 3 is a schematic circuit connection diagram of a power conversion circuit, in which a first transformer coil 310 includes a first coil and a second coil arranged from top to bottom;

The input end of the first conversion circuit 100 is connected with the first coil, and the output end of the first conversion circuit 100 is connected with the second coil;

Or referring to fig. 4, fig. 4 is a schematic diagram of still another circuit connection of the power conversion circuit, where an input terminal of the first conversion circuit 100 is connected to the second coil, and an output terminal of the first conversion circuit 100 is connected to the first coil.

In this embodiment, based on the replaceability of the primary and secondary windings of the transformer, one of the first winding and the second winding may be the primary winding of the first transformer winding 310, the other is the secondary winding of the first transformer winding 310, taking the power conversion circuit as a charger circuit as an example, the first conversion circuit 100 may be an OBC circuit, the second conversion circuit 200 may be a DCDC circuit, and two proposed implementation manners of topology and magnetic device integration of the OBC circuit and the DCDC circuit are shown in fig. 3 and 4. Wherein Vbus is output voltage of a PFC circuit in an OBC circuit, vhv is high-voltage power battery voltage, vlv is 12V storage battery voltage, and a magnetic circuit of an OBC inductor and a magnetic circuit of a DCDC inductor share one magnetic column. The magnetic devices are respectively a DCDC transformer, a DCDC inductor, an OBC inductor and an OBC transformer from top to bottom. Wherein the magnetic circuit of the DCDC transformer and the magnetic circuit of the DCDC inductor share a third common magnetic leg 380, the DCDC inductor and the OBC inductor share a second common magnetic leg 370, and the OBC inductor and the OBC transformer share a first common magnetic leg 360. In the implementation mode, the DCDC transformer, the DCDC inductor and the OBC inductor are respectively composed of an E-shaped magnetic core and a winding surrounding a column in the E-shaped magnetic core, and the OBC transformer is composed of two E-shaped magnetic cores and windings surrounding the column in the E-shaped magnetic core through a closed magnetic circuit corresponding to the adjacent shared magnetic column, and the two E-shaped magnetic cores are oppositely arranged in a mirror image mode in an adjacent magnetic column mode. Referring to fig. 3, the OBC input circuit is composed of a first capacitor C1, a second capacitor C2, a first switching tube Q1-a fourth switching tube Q4, and an OBC inductor, the OBC inductor is connected with a first coil of an OBC transformer coil and then connected with the OBC input circuit, the OBC output circuit is composed of a third capacitor C3, a fourth capacitor C4, and a fifth switching tube Q5-an eighth switching tube Q8, the OBC output circuit is connected with a second coil of the OBC transformer coil, the first coil is used as a primary coil, the second coil is used as a secondary coil, or the OBC input circuit is composed of the first capacitor C1, the second capacitor C2, and then the OBC input circuit is connected with the second coil of the OBC transformer coil according to fig. 4, the first switching tube Q1-fourth switching tube Q4 is formed, the OBC input circuit is connected with the second coil of the OBC transformer coil, the OBC output circuit is formed by a third capacitor C3, a fourth capacitor C4, a fifth switching tube Q5-eighth switching tube Q8 and an OBC inductor, the OBC inductor coil is connected with the OBC output circuit after being connected with the first coil of the OBC transformer coil, the second coil is used as a primary coil at the moment, the first coil is used as a secondary coil, and two connection modes of the OBC circuit and the self transformer are further realized. The DCDC input circuit is composed of a fifth capacitor C5 and a ninth switching tube Q9-twelfth switching tube Q12, the DCDC input circuit is connected with the OBC output circuit, the DCDC input circuit is connected with a primary coil in a DCDC transformer coil, a secondary coil in the DCDC transformer coil is connected with a DCDC inductance coil and then is connected with a DCDC output circuit composed of a sixth capacitor C6 and a thirteenth switching tube Q13-fourteenth switching tube Q14, and then the connection of the whole power conversion circuit is achieved. The OBC transformer, the OBC inductor, the DCDC transformer and the DCDC inductor in the whole circuit are integrated on one magnetic core 350, and the magnetic circuits of two adjacent magnetic devices share one shared magnetic column of the magnetic core 350, so that the number of magnetic cores required by the magnetic devices is further reduced, the sizes of the OBC magnetic devices and the DCDC magnetic devices are reduced, and the power density of the vehicle-mounted charger is further improved while the use cost of the magnetic devices in the vehicle-mounted charger is reduced.

The present embodiment provides a power conversion circuit, which includes a first conversion circuit 100, a first transformer coil 310, a first inductance coil 320, a second inductance coil 330, a second transformer coil 340, a magnetic core 350, and a second conversion circuit 200, the first conversion circuit 100 is connected to the second conversion circuit 200, the first transformer coil 310 and the first inductance coil 320 are connected to the first conversion circuit 100, and the second inductance coil 330 and the second transformer coil 340 are connected to the second conversion circuit 200; the magnetic core 350 includes a first common leg 360 disposed between the first transformer coil 310 and the first inductor coil 320, a second common leg 370 disposed between the first inductor coil 320 and the second inductor coil 330, and a third common leg 380 disposed between the second inductor coil 330 and the second transformer coil 340. The first transformer coil 310, the first inductance coil 320, the second inductance coil 330 and the second transformer coil 340 are integrated and shared by the magnetic cores through the shared magnetic column, so that the phenomenon that two independent integrated magnetic devices exist in the prior art and the magnetic cores in the two integrated magnetic devices cannot be utilized to the greatest extent is avoided, the two independent integrated magnetic devices are further integrated in a shared magnetic column mode, and the power density is improved.

Further, in still another embodiment of the power conversion circuit according to the present application, referring to fig. 5, fig. 5 is a schematic structural diagram of the magnetic core 350 of the power conversion circuit, which is shown in the case that the magnetic core 350 is composed of a plurality of E-type magnets, the center leg of each E-type magnet may be used as a winding center leg of the magnetic core 350, the magnetic core 350 further includes a first winding center leg, a second winding center leg, a third winding center leg and a fourth winding center leg that are sequentially arranged at intervals, the first transformer coil 310 is wound on the first winding center leg, the first inductor coil 320 is wound on the second winding center leg, the second inductor coil 330 is wound on the third winding center leg, and the second transformer coil 340 is wound on the fourth winding center leg.

Further, referring to fig. 6, fig. 6 is a schematic diagram of another structure of the power conversion circuit magnetic core 350, where the magnetic core 350 is formed by a plurality of U-shaped magnets, one leg of each U-shaped magnet may be used as a winding leg of the magnetic core 350, similarly, the magnetic core 350 includes a first winding leg, a second winding leg, a third winding leg and a fourth winding leg that are sequentially adjacent, the first transformer coil 310 is wound on the first winding leg, the first inductor coil 320 is wound on the second winding leg, the second inductor coil 330 is wound on the third winding leg, and the second transformer coil 340 is wound on the fourth winding leg.

In this embodiment, to ensure that the magnetic devices of the OBC and DCDC are shared, the winding center post of the magnetic core 350 is further divided into four parts, and the number of magnetic devices of the winding may be actually divided according to the requirement, which is not limited herein. Taking four magnetic devices as an example, the four winding center posts of the magnetic core 350 are respectively wound with the first transformer coil 310, the first inductance coil 320, the second inductance coil 330 and the second transformer coil 340 in turn, so as to ensure that the second inductance coil 330 and the first inductance coil 320 are adjacent, that is, the OBC inductance coil and the DCDC inductance coil must be adjacent windings. Referring to fig. 5 (b) and 6 (d), when the first conversion circuit 100 is an OBC circuit, the second conversion circuit 200 is a DCDC circuit, the first transformer coil 310 is an OBC transformer coil and is wound on the first winding center post, the first inductor coil 320 is an OBC inductor coil and is wound on the second winding center post, the second inductor coil 330 is a DCDC inductor coil and is wound on the third winding center post, and the second transformer coil 340 is a DCDC transformer coil and is wound on the fourth winding center post. Fig. 5 (a) and 6 (c) show the case where the first conversion circuit 100 is a DCDC circuit, the second conversion circuit 200 is an OBC circuit, the first transformer coil 310 is a DCDC transformer coil and wound around the first winding center post, the first inductor coil 320 is a DCDC inductor coil and wound around the second winding center post, the second inductor coil 330 is an OBC inductor coil and wound around the third winding center post, and the second transformer coil 340 is an OBC transformer coil and wound around the fourth winding center post. The core units constituting the core 350 may be U-shaped, E-shaped or other kinds of cores, and are not limited herein. The U-shaped and E-shaped cores are illustrated herein, and the magnetic piece integration of core 350 includes four ways:

As shown in fig. 5 (a), the magnetic element integration method 1 of the E-type magnetic core is: the DCDC transformer (E-type magnetic core), the DCDC inductor (E-type magnetic core), the OBC inductor (E-type magnetic core) and the OBC transformer (E-type magnetic core) are arranged adjacently in sequence;

As shown in fig. 5 (b), the magnetic element integration method 2 of the E-type magnetic core is as follows: the OBC transformer (E-type magnetic core), the OBC inductor (E-type magnetic core), the DCDC inductor (E-type magnetic core) and the DCDC transformer (E-type magnetic core) are arranged adjacently in sequence;

As shown in fig. 6 (c), the magnetic element integration mode 3 of the U-shaped magnetic core is: the DCDC transformer (U-shaped magnetic core), the DCDC inductor (U-shaped magnetic core), the OBC inductor (U-shaped magnetic core) and the OBC transformer (U-shaped magnetic core) are arranged adjacently in sequence;

as shown in fig. 6 (d), the magnetic element integration mode 4 of the U-shaped magnetic core is: the OBC transformer (U-shaped magnetic core), the OBC inductor (U-shaped magnetic core), the DCDC inductor (U-shaped magnetic core) and the DCDC transformer (U-shaped magnetic chip) are arranged adjacently in sequence.

It should be noted that, the winding center leg of the magnetic core 350 may be a center leg or a side leg of the E-type magnetic core, or any side leg of the U-type magnetic core, which is not limited herein, and the winding center leg may be a complete magnetic leg, or may be formed by stacking a plurality of sub-winding center legs and then winding the coil. By the arrangement, the OBC magnetic device and the DCDC magnetic device can be further integrated, so that the number of magnetic cores required by the magnetic device is further reduced, the sizes of the OBC magnetic device and the DCDC magnetic device are reduced, and the use cost of the magnetic device in the vehicle-mounted charger is reduced, and meanwhile, the power density of the vehicle-mounted charger is further improved.

Further, in still another embodiment of the power conversion circuit of the present application, referring to fig. 7, fig. 7 is a schematic structural diagram of a winding stem and an air gap of the magnetic core 350, where an air gap exists below at least one winding stem, or an air gap exists above at least one winding stem.

Further, the at least one winding leg comprises at least two sub-winding legs, with an air gap between adjacent two sub-winding legs.

In this embodiment, the magnetic device will post an air gap in the winding in order to tune out the proper inductance. Thus, in the above magnetic core solution, the winding leg feature of the magnetic core comprises at least one of the following solutions:

Scheme 1, as in (a) of fig. 7: the winding center post of the magnetic core is above the air gap;

Scheme 2, as in (b) of fig. 7: the winding center posts of the magnetic core are formed by superposing a plurality of sub-winding center posts, and air gaps are arranged between adjacent sub-winding center posts (the winding center posts and the air gaps are alternately arranged);

Scheme 3, as in (c) of fig. 7: the winding leg of the core is below the air gap.

Based on the setting position of the air gap, the practicality of the magnetic device of the power conversion circuit can be improved while the inductance value is ensured.

Further, in yet another embodiment of the power conversion circuit of the present application, the magnetic core 350 includes a first magnetic core, a second magnetic core, a third magnetic core, and a fourth magnetic core stacked in the same direction in this order, the first magnetic core including a first winding middle leg and a first common magnetic leg 360, the second magnetic core including a second winding middle leg and a second common magnetic leg 370, the third magnetic core including a third winding middle leg and a third common magnetic leg 380, and the fourth magnetic core including a fourth winding middle leg.

In this embodiment, the magnetic core 350 includes four sequentially stacked magnetic core units in the same direction, the magnetic core units may be an E-type magnetic core or a U-type magnetic core, and the openings of the four E-type magnetic cores or the U-type magnetic cores are the same and are stacked in sequence, where the first magnetic core includes a first winding middle post and a first common magnetic post 360 connected to the first winding middle post, the second magnetic core includes a second winding middle post and a second common magnetic post 370 connected to the second winding middle post, the third magnetic core includes a third winding middle post and a third common magnetic post 380 connected to the second winding middle post, and the fourth magnetic core includes a fourth winding middle post, so that the magnetic circuits generated by two adjacent magnetic devices may share one common magnetic post of the magnetic core 350, thereby realizing the integration of the magnetic devices of two conversion circuits, reducing the number of magnetic devices, and further improving the power density.

Specifically, the magnetic core further comprises a fifth magnetic core, and the fifth magnetic core is adjacent to the first magnetic core and forms a closed magnetic core loop.

Specifically, the fifth magnetic core is an E-type magnetic core or a U-type magnetic core, and a center pillar of the fifth magnetic core is arranged opposite to the center pillar of the first winding so as to form a closed magnetic core loop; or alternatively, the first and second heat exchangers may be,

The fifth magnetic core is an I-shaped magnetic core, and the fifth magnetic core is arranged adjacent to the first winding center post so as to form a closed magnetic core loop.

In this embodiment, since the magnetic core 350 includes four E-shaped magnetic cores or U-shaped magnetic cores having the same opening orientation and stacked in order, in order to enable the first magnetic core of the magnetic core 350 to form a closed magnetic core loop, a fifth magnetic core is disposed at the opening of the first magnetic core to close the opening of the first magnetic core, so that the first magnetic core can form a closed magnetic core loop. The fifth magnetic core may be an E-type magnetic core or a U-type magnetic core, and when the other four magnetic core units are E-type magnetic cores, the fifth magnetic core is also a U-type magnetic core when the other four magnetic core units are U-type magnetic cores, and the center leg of the fifth magnetic core is adjacent to and opposite to the center leg of the first winding, that is, the opening of the fifth magnetic core is opposite to the opening of the first magnetic core, thereby forming an "E ≡" structure. The fifth magnetic core may also be an I-type magnetic core, and the fifth magnetic core is disposed adjacent to the first winding center pillar, specifically, the fifth magnetic core is disposed at an opening of the first magnetic core and intersects the first winding center pillar, thereby forming an "EI" structure, and the opening of the first magnetic core is closed by the fifth magnetic core to form a closed magnetic core loop.

Specifically, the first transformer coil comprises a primary coil and a secondary coil;

When the fifth magnetic core is an E-shaped magnetic core or a U-shaped magnetic core, the primary coil is wound on a central column of the fifth magnetic core, and the secondary coil is wound on a central column of the first winding; or alternatively, the first and second heat exchangers may be,

The primary coil is wound on the first winding center post, and the secondary coil is wound on the center post of the fifth magnetic core.

In this embodiment, the magnetic core 350 may include four magnetic core units with the same opening orientation and stacked in sequence, and the magnetic core units may be E-shaped magnetic cores or U-shaped magnetic cores, which are not limited herein, and each of the center posts of each of the magnetic core units is wound with a respective coil. Because the magnetic core 350 needs to form a closed structure, a fifth magnetic core needs to be added to close the opening of the first magnetic core, when the fifth magnetic core is an E-type magnetic core or a U-type magnetic core, the primary winding of the first transformer coil can be wound on one of the middle post of the fifth magnetic core and the first winding middle post of the first magnetic core, and the secondary winding of the first transformer coil is wound on the other middle post, so that the first magnetic core, the fifth magnetic core and the first transformer coil together form a first transformer, and a closed magnetic core loop is formed.

In addition, the application also provides a vehicle-mounted charger, which comprises the power conversion circuit.

The specific structure of the power conversion circuit refers to the above embodiments, and since the vehicle-mounted charger adopts all the technical solutions of all the embodiments, the vehicle-mounted charger has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.

In addition, the application also provides an automobile, which comprises an automobile charging component and the vehicle-mounted charger, and the vehicle-mounted charger is arranged in the automobile charging component.

In an embodiment, the vehicle comprises the vehicle-mounted charger and the vehicle charging component, and the vehicle-mounted charger is arranged in the vehicle charging component. The specific structure of the vehicle-mounted charger refers to the above embodiments, and because the vehicle adopts all the technical solutions of all the embodiments, the vehicle-mounted charger has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the application, and all equivalent structural changes made by the description of the present application and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the application.

Claims (10)

1. The power conversion circuit is characterized by comprising a first conversion circuit and a second conversion circuit electrically connected with the first conversion circuit; magnetic devices are arranged in the first conversion circuit and the second conversion circuit, and the magnetic devices comprise: a first transformer coil, a first inductor coil, a second transformer coil and a second inductor coil in the second conversion circuit, and magnetic cores distributed in the first conversion circuit and the second conversion circuit;

The magnetic core comprises a first common magnetic pillar arranged between the first transformer coil and the first inductance coil, a second common magnetic pillar arranged between the first inductance coil and the second inductance coil, and a third common magnetic pillar arranged between the second inductance coil and the second transformer coil.

2. The power conversion circuit of claim 1, wherein the magnetic core further comprises a first winding leg, a second winding leg, a third winding leg, and a fourth winding leg that are sequentially disposed at intervals, the first transformer coil being wound on the first winding leg, the first inductor coil being wound on the second winding leg, the second inductor coil being wound on the third winding leg, and the second transformer coil being wound on the fourth winding leg.

3. The power conversion circuit of claim 2, wherein an air gap is present below at least one of the winding center posts or an air gap is present above at least one of the winding center posts.

4. The power conversion circuit of claim 2 wherein at least one of said winding center posts comprises at least two sub-winding center posts, an air gap being present between adjacent two of said sub-winding center posts.

5. The power conversion circuit of claim 2, wherein the magnetic core comprises a first magnetic core, a second magnetic core, a third magnetic core, and a fourth magnetic core stacked in a same direction in sequence, the first magnetic core comprising the first winding leg and the first common magnetic leg, the second magnetic core comprising the second winding leg and the second common magnetic leg, the third magnetic core comprising the third winding leg and the third common magnetic leg, and the fourth magnetic core comprising the fourth winding leg.

6. The power conversion circuit of claim 5, wherein the magnetic core further comprises a fifth magnetic core disposed adjacent to the first magnetic core and forming a closed magnetic core loop.

7. The power conversion circuit of claim 6, wherein the fifth magnetic core is an E-core or a U-core, a center leg of the fifth magnetic core being disposed opposite the first winding center leg to form the closed magnetic core loop; or alternatively, the first and second heat exchangers may be,

The fifth magnetic core is an I-shaped magnetic core, and the fifth magnetic core is arranged adjacent to the first winding center post so as to form a closed magnetic core loop.

8. The power conversion circuit of claim 7, wherein the first transformer coil comprises a primary coil and a secondary coil;

When the fifth magnetic core is an E-shaped magnetic core or a U-shaped magnetic core, the primary coil is wound on a middle column of the fifth magnetic core, and the secondary coil is wound on a middle column of the first winding; or alternatively, the first and second heat exchangers may be,

The primary coil is wound on the first winding center post, and the secondary coil is wound on the center post of the fifth magnetic core.

9. A vehicle-mounted charger, characterized in that it comprises a power conversion circuit according to any one of claims 1 to 8.

10. An automobile comprising an automobile charging member and the vehicle-mounted charger of claim 9, and the vehicle-mounted charger being disposed within the automobile charging member.