This application claims priority to China Patent Application No. 202210141141.X, filed on Feb. 16, 2022, the entire contents of which are incorporated herein by reference for all purposes.
The present disclosure relates to a magnetic element and an on-board charger using the same, and more particularly to an integrated magnetic element and an on-board charger using the same.
With the development of the on-board charger (OBC) technology, the demand for magnetic elements (including inductors and transformers) with high power density, high efficiency, efficient thermal dissipation, small volume and low cost in on-board chargers has become more urgent. Therefore, as the key component of OBC power supply, the continuous pursuit of the high performance requirement, the optimization of production process and the low cost for magnetic element have become a crucial development direction for OBC power supply.
Conventionally, the D2D (DC to DC) circuit of the OBC power supply may adopt LLC circuit, Boost SRC circuit, CLLLC circuit or CLLC circuit. The resonant tank of those circuits includes power magnetic elements, which generally adopt conventional separation components. That is, the resonant inductor and the transformer are designed separately and independently. The disadvantage of the conventional separation components design is that the material consumption of the magnetic core is relatively large, resulting in a large volume and high weight. Accordingly, it would be difficult to dissipate heat inside the magnetic element, and the manufacturing cost is relatively high. In order to reduce the volume and weight of the magnetic elements, an integrated multi-slot transformer may be adopted. Under this circumstance, the leakage inductance between the primary and secondary windings of the transformer is utilized as the resonant inductance, and the multi-slot transformer is packaged into a metal heat sink. However, it is difficult to reduce the distance between the primary and secondary windings, especially when the number of the winding turns is relatively small. In addition, the external magnetic flux leakage between the primary and secondary windings will cause additional losses on the metal heat sink. Therefore, it is necessary to provide additional shielding (such as magnetic shielding, copper foil shielding, etc.) or to increase the space distance appropriately, resulting in the complexity of design, and the production cost are increased.
Therefore, there is a need of providing a magnetic element and an on-board charger using the same to obviate the drawbacks encountered from the prior arts.
It is an object of the present disclosure to provide a magnetic element and an on-board charger using the same. In the integrated magnetic element of the present disclosure, at least one coil winding is wound on the first winding column and the second winding column simultaneously. The leakage inductance generated by the first coil winding and the second coil winding on the first winding column and the inductance generated by the first coil winding or the second coil winding on the second winding column are combined to form the required resonant inductance. Therefore, the overall volume and weight and the production cost of the magnetic element are reduced, and the power density of the magnetic element is improved.
It is another object of the present disclosure to provide a magnetic element and an on-board charger using the same. In the magnetic element, the opening is disposed on the first side column or the second side column. Therefore, the thermal dissipation medium (such as thermal dissipation glue) is filled in the gap between the first coil winding and the magnetic core and/or the gap between the second coil winding and the magnetic core through the opening, so as to improve the overall thermal dissipation performance of the magnetic element. In addition, the thermal dissipation medium (such as forced air or cooling liquid) may flow through the gap between the first coil winding and the magnetic core and/or the gap between the second coil winding and the magnetic core through the opening, thereby taking away the heat generated by the magnetic element. Furthermore, the first coil winding and the second coil winding are wound alternately with an interval along the axial direction on the first winding column, which simplifies the manufacturing process of the magnetic element. Moreover, the thermal dissipation glue is filled into the coil winding of the magnetic element through the interval between the first coil winding and the second coil winding, or the forced air or the cooling liquid may flow through the interval, which further enhances the thermal dissipation effect of the magnetic element.
In accordance with an aspect of the present disclosure, there is provided a magnetic element. The magnetic element includes a magnetic core, M first coil windings and N second coil windings and an opening, wherein M and N are positive integers. The magnetic core includes a first cover plate, a second cover plate, a first winding column, a second winding column, a first side column and a second side column. The first cover plate and the second cover plate are disposed opposite to each other. The first winding column and the second winding column are disposed between the first cover plate and the second cover plate. The first side column and the second side column are disposed between the first cover plate and the second cover plate and are disposed on two sides of a central connection line of the first winding column and the second winding column, respectively. The M first coil windings and the N second coil windings are wound at intervals on the first winding column. The opening is disposed on the first side column or the second side column, the opening penetrates through from a side of the first side column or the second side column away from the central connection line to a side of the first side column or the second side column close to the central connection line. At least one coil winding of the M first coil windings and N second coil windings is wound on the first winding column and the second winding column simultaneously.
In accordance with another aspect of the present disclosure, there provided an on-board charger including a case and a magnetic element. The case includes a thermal dissipation cavity, and the magnetic element is disposed in the thermal dissipation cavity. The magnetic element includes a magnetic core, M first coil windings and N second coil windings and an opening, wherein M and N are positive integers. The magnetic core includes a first cover plate, a second cover plate, a first winding column, a second winding column, a first side column and a second side column. The first cover plate and the second cover plate are disposed opposite to each other. The first winding column and the second winding column are disposed between the first cover plate and the second cover plate. The first side column and the second side column are disposed between the first cover plate and the second cover plate and are disposed on two sides of a central connection line of the first winding column and the second winding column, respectively. The M first coil windings and the N second coil windings are wound at intervals on the first winding column. The opening is disposed on the first side column or the second side column, the opening penetrates through from a side of the first side column or the second side column away from the central connection line to a side of the first side column or the second side column close to the central connection line. At least one coil winding of the M first coil windings and N second coil windings is wound on the first winding column and the second winding column simultaneously. A thermal dissipation glue is filled in a gap between the magnetic element and the thermal dissipation cavity.
The above contents of the present disclosure will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
The present disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this disclosure are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
In an embodiment, as shown in
As shown in
In an embodiment, the magnetic element 1 includes two openings 5 disposed on the first side column 23 and the second side column 24 respectively. The two openings 5 are symmetrically disposed relative to the central connection line C of the first winding column 25 and the second winding column 26. In an embodiment, the opening 5 is disposed on the first side column 23 or the second side column 24 corresponding to the gap between the first winding column 25 and the second winding column 26.
In an embodiment, there is an air-gap d between the second winding column 26 and the first cover plate 21 and/or between the second winding column 26 and the second cover plate 22. Please refer to
Please refer to
Please refer to
Please refer to
From the above description, the present disclosure provides a magnetic element and an on-board charger using the same. In the magnetic core, at least one coil winding is wound on the first winding column and the second winding column simultaneously. The leakage inductance generated by the first coil winding and the second coil winding on the first winding column and the inductance generated by the first coil winding or the second coil winding on the second winding column are combined to form the required resonant inductance. Therefore, the overall volume and weight and the production cost of the magnetic element are reduced, and the power density of the magnetic element is improved. In addition, the winding losses is reduced due to the distributed air-gap between the second winding column and the cover plate. The magnetic element of the present disclosure further includes an opening disposed on the first side column or the second side column. Therefore, the thermal dissipation glue is filled in the gap between the first coil winding and the magnetic core and/or the gap between the second coil winding and the magnetic core through the opening, so as to improve the overall thermal dissipation performance of the magnetic element. In addition, the thermal dissipation medium (such as forced air or cooling liquid) may flow through the gap between the first coil winding and the magnetic core and/or the gap between the second coil winding and the magnetic core through the opening, thereby taking away the heat generated by the magnetic element. Furthermore, the M first coil windings and the N second coil windings wound alternately with an interval along the axial direction on the first winding column, which simplifies the manufacturing process of the magnetic element. Moreover, the thermal dissipation glue is filled into the coil winding of the magnetic element through the interval between the first coil winding and the second coil winding, or the forced air or the cooling liquid may flow through the interval between the first coil winding and the second coil winding, which further enhances the thermal dissipation effect of the magnetic element.
While the disclosure has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the disclosure needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Number | Date | Country | Kind |
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202210141141.X | Feb 2022 | CN | national |