The invention relates to a magnetic component and a magnetic body thereof and, more particularly, to a magnetic component and a magnetic body thereof capable of uniformizing magnetic field distribution and improving thermal balance.
A magnetic component is an important electric component used for storing energy, converting energy and isolating electricity. In most of circuits, there is always a magnetic component installed therein. In general, the magnetic component mainly comprises a reactor, a transformer and an inductor. The magnetic component usually consists of a magnetic body and at least one coil disposed in the magnetic body. When an electronic device equipped with the magnetic component is operating, heat generated by the magnetic component will be accumulated to make the temperature of the electronic device rise, such that the operating efficiency of the electronic device will be reduced or even the magnetic body may crack. Therefore, how to avoid heat accumulation to improve thermal balance for the magnetic component has become a significant design issue.
The invention provides a magnetic component and a magnetic body thereof capable of uniformizing magnetic field distribution and improving thermal balance, so as to solve the aforesaid problems.
According to an embodiment of the invention, a magnetic component comprises a magnetic body and a coil. The magnetic body comprises an inner leg, at least one outer leg, a first bottom portion and a second bottom portion. The inner leg and the at least one outer leg protrude from the first bottom portion and the second bottom portion. A cross-sectional area of the inner leg is larger than a total cross-sectional area of the at least one outer leg. The coil is wound around the inner leg.
According to another embodiment of the invention, a magnetic body comprises an inner leg, at least one outer leg and a bottom portion. A cross-sectional area of the inner leg is larger than a total cross-sectional area of the at least one outer leg. The inner leg and the at least one outer leg protrude from the bottom portion.
As mentioned in the above, the invention adjusts and optimizes the cross-sectional areas of the inner leg and the at least one outer leg of the magnetic body to improve the characteristics of the magnetic component. Specifically, the cross-sectional area of the inner leg is larger than the total cross-sectional area of the at least one outer leg. When the structure of the magnetic body conforms to the aforesaid geometric criteria, the magnetic body can uniformize magnetic field distribution and then avoid heat accumulation to improve thermal balance for the magnetic component.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Referring to
The magnetic component 1 of the invention may be a reactor, a transformer, an inductor or other magnetic components. As shown in
In this embodiment, the magnetic body 10 may comprise a plurality of outer legs 102, but the invention is not so limited. As shown in
In this embodiment, the coil 12 is wound around the inner leg 100 and there is no coil wound around the outer leg 102. A magnetic flux MF generated by the coil 12 wound around the inner leg 100 passes through cross-sectional areas of the inner leg 100, the first bottom portion 104, the outer leg 102 and the second bottom portion 106 in sequence. Furthermore, a gap may exist between the inner legs 100 or/and the outer legs 102 of the cores 10a, 10b according to practical applications.
In this embodiment, a cross-sectional area of the inner leg 100 is larger than a total cross-sectional area of the outer leg 102. As shown in
It should be noted that the number of the at least one outer leg 102 may be equal to N (N is a positive integer) and the cross-sectional areas of the inner leg 100 and the cross-sectional areas of the N outer legs 102 may be defined as A3_1, . . . , A3_N. Thus, the N outer legs 102 conform to the following inequality: A1>A3_1+ . . . +A3_N. In another embodiment, if the number of the at least one outer leg 102 is equal to 1, the cross-sectional areas of the inner leg 100 and the outer leg 102 conform to the following inequality: A1>A3_1. In another embodiment, if the number of the at least one outer leg 102 is equal to 4, the cross-sectional areas of the inner leg 100 and the four outer legs 102 conform to the following inequality: A1>A3_1+A3_2+A3_3+A3_4.
In this embodiment, the cross-sectional area of the inner leg 100 is larger than the total cross-sectional area of the two outer legs 102. Preferably, from the viewing angle shown in
In another embodiment, the cross-sectional area of the inner leg 100 may be further larger than an effective cross-sectional area of the magnetic body 10. When a number of the at least one outer leg 102 is equal to N (N is a positive integer), the effective cross-sectional area of the magnetic body 10 may be obtained by Aeff=(A1*V1+A2_1*V2_1+A2_2*V2_2+A3_1*V3_1+ . . . +A3_N*V3_N)/((V1*N+V2_1+V2_2+V3_1+ . . . +V3_N)/N), wherein Aeff represents the effective cross-sectional area, A1 represents the cross-sectional area of the inner leg 100 (as shown in
In this embodiment, for example, provided that A1 is equal to 530 mm2, A2_1 is equal to 262 mm2, A2_2 is equal to 220 mm2, A3_1 is equal to 260 mm2, A3_2 is equal to 220 mm2, V1 is equal to 14861 mm3, V2_1 is equal to 6064 mm3, V2_2 is equal to 5091.9 mm3, V3_1 is equal to 4974 mm3, and V3_2 is equal to 4208.8 mm3, Aeff will be equal to 511.56 mm2 through the aforesaid equation. When the structure of the magnetic body 10 further conforms to the aforesaid geometric criteria, the magnetic body 10 can also uniformize magnetic field distribution and then avoid heat accumulation to improve thermal balance for the magnetic component 1. In the aforesaid inequality and equation, when A2_1 is equal to A2_2 or/and A3_1 is equal to A3_2, the thermal stress will be further reduced.
In another embodiment, the cross-sectional area of the inner leg 100 may be further larger than a total cross-sectional area of the first bottom portion 104 and the second bottom portion 106. As shown in
Referring to tables 1 and 2 below, tables 1 and 2 show several effect comparisons between the original structure and the improved structure of the invention. In table 2, AB represents differential magnetic distribution and ΔT represents differential temperature, wherein AB is the difference between the magnetic field density B1 of the inner leg 100 and the magnetic field density B3 of the outer leg 102. As shown in tables 1 and 2, it is obvious that the invention can uniformize magnetic field distribution and then avoid heat accumulation to improve thermal balance for the magnetic component 1 indeed.
In table 2, ΔB is the difference between the magnetic field density B1 of the inner leg 100 and the magnetic field density B3 of the outer leg 102. Once the absolute value of ΔB (i.e. |ΔB|) decreases or B1 is smaller than B3, the differential temperature ΔT and the thermal stress will decrease correspondingly.
In another embodiment, the first bottom portion 104 or the second bottom portion 106 may comprise a heat dissipating surface for in contact with a heat dissipating module (not shown) for heat dissipation. If the heat dissipating surface of the first bottom portion 104 is in contact with a heat dissipating module for heat dissipation, the cross-sectional area of the first bottom portion 104 may be smaller than the cross-sectional area of the second bottom portion 106. Alternatively, if the heat dissipating surface of the second bottom portion 106 is in contact with a heat dissipating module (not shown) for heat dissipation and the cross-sectional area of the second bottom portion 106 may be smaller than the cross-sectional area of the first bottom portion 104.
Referring to
As shown in
In an embodiment, the cross-sectional area of the inner leg 100 may be a minimum value along a height direction of the inner leg 100 (i.e. the direction of H shown in
In another embodiment, the cross-sectional area of the inner leg 100 may be identical along a height direction of the inner leg 100 (i.e. the direction of H shown in
As mentioned in the above, the invention adjusts and optimizes the cross-sectional areas of the inner leg and the at least one outer leg of the magnetic body to improve the characteristics of the magnetic component. Specifically, the cross-sectional area of the inner leg is larger than the total cross-sectional area of the at least one outer leg. Furthermore, the cross-sectional area of the inner leg may be larger than the effective cross-sectional area of the magnetic body and/or the cross-sectional area of the inner leg may be larger than the total cross-sectional area of the first bottom portion and the second bottom portion. When the structure of the magnetic body conforms to the aforesaid geometric criteria, the magnetic body can uniformize magnetic field distribution and then avoid heat accumulation to improve thermal balance for the magnetic component.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.