KR20090008135A - Inverter transformer - Google Patents

Abstract

An inverter transformer capable of driving two straight tubs to inphase is provided to reduce size of magnet core part by using a first core part as a core member forming a first magnetic path and a second magnetic path. A magnet core part(4) comprises a first core part(44), a second core part(45), a third core part(46), one end side connection core part(47), and other end side connection core part. The first core part is arranged on an axis line(C1) of a primary winding(1), and penetrates an inner part of the primary winding. A second core part is arranged on an axis line(C2) of a first secondary winding(2), and penetrates an inner part of the first secondary winding. A third core part is arranged on an axis line(C3) of a second secondary winding(3), and penetrates an inner part of the second secondary winding. The one end side connection core part connects one ends of the first to the third core part. The other end side connection core part connects the other ends of the first to the third core part. At least one side of the one end side connection core part and the other end side connection core part is made of a core member.

Description

Inverter Transformer {INVERTER TRANSFORMER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter transformer used in a DC / AC inverter circuit for discharging and lighting a backlight cold cathode discharge lamp (CCFL) for various display panels used in notebook computers, liquid crystal televisions, and the like.

Conventionally, in order to electronically couple two secondary windings with respect to one primary winding, the first secondary winding, the primary winding, and the second secondary winding are arranged in this order such that their respective axes are in parallel with each other in parallel. Inverter transformers of the type (hereinafter, referred to as "two-person one side-by-side parallel type") are known.

For example, Japanese Unexamined Patent Application Publication No. 2005-39050 discloses windings of primary windings on the middle legs of two E-shaped cores arranged opposite to each other, and the first and second outer legs on both sides of each E-shaped core. An inverter transformer formed by winding each of the second secondary windings is described.

In the inverter transformer described in Japanese Laid-Open Patent Publication No. 2005-39050, a first magnetic path passing through each of the windings of the primary winding and the first secondary winding by two E-type cores, the primary winding, and the second secondary winding A second passage is formed through each winding of the winding, but each portion of the first and second passages is both formed in the middle leg of the two E-shaped cores. As described above, there is an advantage that, by partially sharing the core member forming the two magnetic paths, the entire transformer can be made compact and the installation area on the substrate can be reduced.

However, in the case of sharing some of the core members forming each of the magnetic paths in this way, it is difficult to separate the two magnetic paths from each other, which causes a problem that the two secondary windings are electronically coupled to each other. For this reason, this type of inverter transformer of the related art can be used only to lightly drive one U-tube or similar U-tube by turning each voltage output from two secondary windings in reverse with each other. It is considered to be difficult to use to drive lighting.

In order to drive two straight pipes in phase, each core member is formed to form each magnetic path to completely separate the two magnetic paths, or the current balance as described in, for example, Japanese Patent Laid-Open No. 2006-287177. Although it is considered that it is necessary to use a transformer, either method may cause problems such as an increase in size due to an increase in the number of components and an increase in the installation area on the substrate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a two-in-one transverse parallel type inverter transformer having a compact configuration capable of driving two straight tubes in phase and lighting them on a substrate. It is done.

The inverter transformer according to the present invention is arranged in this order such that the first secondary winding, the primary winding, and the second secondary winding are parallel with each axis parallel to each other, and each of the primary winding and the first secondary winding An inverter transformer comprising a magnetic core portion for forming a first magnetic path passing through a winding and a second magnetic path passing through each winding of the primary winding and the second secondary winding, wherein the magnetic core portion is the primary winding. A first core portion disposed on the axis of the primary winding so as to penetrate the inside, a second core portion disposed on the axis of the first secondary winding so as to insert the inside of the first secondary winding, the second Connecting end portions of one end side of the third core portion disposed on the axis of the second secondary winding and one end of the first, second and third core portions so as to penetrate the secondary winding; Side connected to the core portion, and is made by having the first, second and the other end portion connected to the core for connecting end portions of the core 3 the other end portion,

At least one of the one end side connecting core portion and the other end side connecting core portion is composed of two core members,

The two core members are arranged so that each one end thereof faces each other at a predetermined interval with the axis of the primary winding interposed therebetween, and the both core parts come into contact with one end portion of the first core part. .

It is preferable that the said magnetic core part is comprised so that the cross-sectional area of a said 1st core part may become larger than each cross-sectional area of the said 2nd and 3rd core part in the comparison of the cross section perpendicular | vertical to each said axis line.

The magnetic core portion preferably comprises two I-type cores and one E-type core constituting the two core members.

Effect of the Invention

In the inverter transformer of the present invention, a first magnetic path is formed by a first core part, a second core part, a part of one end connection core part, and a part of the other end connection core part, and the first core part, the third core part, The second magnetic path is formed by the other part of the one end side connecting core portion and the other part of the other end side connecting core portion.

Each part of the first and second paths is all formed in the first core part, but at least one of the one end side core part and the other end connection core part is composed of two core members, and the two core members are each The first and second secondary windings are electronically coupled to each other by being arranged such that one end faces each other at a predetermined interval with the axis of the first core portion interposed therebetween and so as to contact both ends of the first core portion. By preventing the separation of the first and second paths well. Therefore, it becomes possible to drive two straight pipes respectively connected to the first and second secondary windings in phase in light.

In addition, since the magnetic core part can be made small by sharing the first core part without completely separating and installing the core members forming the first and second magnetic paths, the inverter transformer as a whole has a compact structure having a small installation area on the substrate. It becomes possible.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the inverter transformer by this invention is described in detail, referring an accompanying drawing.

1 is a plan view of an inverter transformer according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view thereof (a state in which the winding is not mounted). 4 is a plan view of the magnetic core portion, and FIG. 5 is a cross-sectional view (cross section taken along the line A-A of FIG. 4).

The inverter transformer of the present embodiment is used in a DC / AC inverter circuit for discharging and lighting a cold cathode discharge lamp (CCFL) for backlighting of various display panels used for notebooks, liquid crystal televisions, and the like, for example. As shown, a magnetic body made of a magnetic material such as a primary winding 1, a first secondary winding 2 and a second secondary winding 3 which are electromagnetically coupled to the primary winding 1, respectively, ferrite, permalloy, and sendust. The core part 4, the primary side bobbin terminal block 5 in which the primary winding 1 is wound and held, the first secondary side bobbin terminal block 6 in which the first secondary winding 2 is held in winding, and the second secondary winding ( 3) is provided with the 2nd secondary side bobbin terminal block 7 hold | maintained by winding. In addition, the illustration of the primary winding 1, the 1st secondary winding 2, and the 2nd secondary winding 3 is abbreviate | omitted in FIG.

In addition, this inverter transformer is a state in which the first secondary winding (2), the primary winding (1) and the second secondary winding (3) are in parallel with each axis C ₂ , C ₁ , C ₃ in parallel with each other. In the drawing, the two-membered one-to-parallel type is arranged in this order from the left side, and the magnetic core 4 is a first magnetic path passing through the respective windings of the primary winding 1 and the first secondary winding 2. (M ₁ ) and a second magnetic path (M ₂ ) passing through each of the windings of the primary winding (1) and the second secondary winding (3) (detailed description of the magnetic core portion 4) To be described later].

The primary side bobbin terminal block 5 has a hollow primary side winding portion 52 having end blades 51A and 51B at both ends, and a primary side terminal holding portion 53 integrally formed with the primary side winding portion 52. And primary side terminals 54A and 54B held by the primary side terminal holding portion 53. In addition, the primary winding 1 is wound around the primary side winding portion 52, and both ends thereof are configured to be connected to the primary side terminals 54A and 54B, respectively.

The first secondary side bobbin terminal 6 has a hollow secondary side winding portion 62 having end blades 61A and 61B at both ends, and a secondary side terminal holding portion integrally formed with the secondary side winding portion 62. 63) and secondary side terminals 64A, 64B, 64C held in the secondary side terminal holding portion 63. The secondary side winding portion 62 is a plurality of winding sections (7 in this embodiment) by the end blades 61A and 61B and a plurality of partition blades 66A to 66F in the present embodiment. The first secondary winding 2 is wound around each winding section. In addition, the partition blades 66A to 66F are provided with cutouts 67 (part numbers omitted) for passing the first secondary windings 2 to adjacent winding sections. Both ends of the wound first secondary winding 2 are configured to be connected to any two of the secondary terminals 64A, 64B, and 64C, respectively.

The second secondary side bobbin terminal block 7 is a hollow secondary side winding portion 72 having end edges 71A and 71B at both ends, similar to the first secondary side bobbin terminal block 6, and the secondary side winding portion ( And a secondary side terminal holding portion 73 integrally formed with 72, and secondary side terminals 74A, 74B and 74C held by the secondary side terminal holding portion 73. The secondary side winding portion 72 is a plurality of winding sections (7 in this embodiment) by the end blades 71A and 71B and a plurality of partition blades 76A to 76F in the present embodiment. The second secondary winding 3 is wound around each winding section. In addition, the partition blades 76A to 76F are provided with cutouts 77 (part numbers omitted) for passing the second secondary winding 3 to an adjacent winding section, so that the secondary windings 72 are formed. Both ends of the wound second secondary winding 3 are configured to be connected to any two of the secondary terminals 74A, 74B, 74C, respectively.

In addition, the second secondary side bobbin terminal block 7 is provided with four alignment recesses 78 at each side edge portion of the upper and lower surfaces (as shown in FIG. have). Similarly, four alignment recesses 58 and 68 are formed on the upper and lower surfaces of the primary side bobbin terminal block 5 and the first secondary side bobbin terminal block 6. These recesses 58, 68 and 78 are formed so as to be an index of alignment when the bobbin terminal blocks 5 to 7 are combined with each other.

As shown in FIG. 4, the magnetic core part 4 is composed of two I-type cores 41 and 42 and one E-type core 43.

The E-shaped core 43 is a first core portion 44 (intermediate leg) disposed on the axis C ₁ of the primary winding so as to penetrate the primary winding 1, the first secondary winding ( 2) Inserts into the second core portion 45 (first outer leg) disposed on the axis C ₂ of the first secondary winding 2 and the second secondary winding 3 so as to insert the inside thereof. A third core portion 46 (second outer leg) disposed on axis C ₃ of the second secondary winding 3, and these first, second and third core portions 44, 45. One end side connecting core portion 47 (base) for connecting the ends of one end side (lower side in the drawing) of the reference numeral 46 is formed integrally.

Further, in the comparison of this E-shaped core 43 is [each axis (C _1, C _2, C _3), a respective cross-section in a plane perpendicular to the in Fig. 1; each cross-section along the line AA shown in Fig. 4 As shown in FIG. 5, the cross-sectional area of the first core portion 44 is configured to be larger than each cross-sectional area of the second core portion 45 and the third core portion 46 (about 2 times in this embodiment). have.

On the other hand, as shown in FIG. 4, the said two I-type cores 41 and 42 are the other end side connection which connects the ends of the other end side (upper side in FIG. 4) of the said 1st, 2nd and 3rd core part. It constitutes the core portion 48, and each one end portion 41a, 42a has a predetermined interval (for example, 0.5) with the axis C ₁ (see FIG. 1) between the primary windings 1 interposed therebetween. 1.5 mm) so as to face each other, and each one end portion 41a, 42a contacts both one end portion (the upper end portion in the figure) of the first core portion 44 (the first embodiment So that the respective contact areas with respect to the first core portion 44 are equal to each other], and the other end portions 41b and 42b are respectively end portions of the second and third core portions 45 and 46 (Fig. Middle part of the upper side).

According to the inverter transformer of the present embodiment, as described above, one end portion 41a, 42a of each of the two I-type cores 41, 42 constituting the other end connection core portion 48 has a primary winding ( It is configured so that each one end portion 41a, 42a is in contact with one end portion of the first core portion 44 so as to face each other at a predetermined interval with the axis C _{1 of 1} ) therebetween. It is possible to prevent the first and second secondary windings 2, 3 from being coupled electronically, so that the first and second magnetic paths M ₁ and M ₂ are well separated. For this reason, it becomes possible to connect a straight pipe to the 1st and 2nd secondary windings 2 and 3, respectively, and to drive these two straight pipes in phase lighting.

In addition, the magnetic core part 4 consists of two I-type cores 41 and 42 and one E-type core 43, and the 1st core part 44 of the E-type core 43 is the 1st. And the magnetic core part 4 as a whole can be configured to be shared as a core member for forming the second magnetic paths M ₁ and M _2. Therefore, the inverter transformer as a whole has a compact structure having a small installation area on the substrate. It becomes possible.

In addition, the cross-sectional area of the first core portion 44 is configured to be larger than the cross-sectional areas of the second core portion 45 and the third core portion 46 (about 2 times), so that the first and second secondary windings 2, Each magnetic flux generated in 3) is not limited and can pass through the first core portion 44.

Hereinafter, the result of having verified the effect of the inverter transformer by the above-mentioned embodiment compared with the other form is demonstrated. Table 1 and Table 2 show the comparison verification results.

In Table 1 and Table 2, the examples have the same configuration as the inverter transformer according to the above embodiment, and the comparative example shows that the other end connection core portion in the inverter transformer according to the above embodiment is formed of one type I core. It is of composition made.

In addition, Ns1 'of Table 1 has shown the leakage inductance value in the 1st secondary winding when the inverter transformer is driven in the state which shorted the 2nd secondary winding (driving frequency is 1 Hz), and K Denotes a coupling coefficient value of the first secondary winding and the second secondary winding at that time.

Similarly, Ns2 'in Table 2 shows the inductance value of the leakage current in the second secondary winding when the inverter transformer is driven with the first secondary winding shorted (the driving frequency is 1 Hz), and K is the time. The coupling coefficient value of a 1st secondary winding and a 2nd secondary winding is shown.

 Ns1 '(μH)  K  Example  26.9  0.000  Comparative example  30.2  0.026

 Ns2 '(μH)  K  Example  22.6  0.000  Comparative example  22.5  0.026

As shown in Table 1 and Table 2, in the comparative example, the coupling coefficient value between the first secondary winding and the second secondary winding is 0.026, which is 0.000 in the examples. Thus, according to the embodiment, it is possible to substantially separate the two paths.

As mentioned above, although embodiment of the inverter transformer by this invention was described, this invention is not limited to this embodiment, The thing of various aspects can be comprised.

For example, in the above embodiment, the magnetic core portion 4 is composed of two I-type cores 41 and 42 and one E-type core 43. T-type core (not shown) in which the first core portion 44 and the one end side connecting core portion 47 are integrally formed, and the first in which the I-type core 41 and the second core portion 45 are integrally formed. It is also possible to comprise an L type core (not shown) and a second L type core (not shown) in which the I type core 42 and the third core portion 46 are integrally formed.

It is also possible to configure the one end side connecting core portion 47 to be made of two core members similarly to the I-type cores 41 and 42.

1 is a plan view of an inverter transformer according to one embodiment.

FIG. 2 is a front view of the inverter transformer shown in FIG. 1.

3 is a perspective view (without winding) of the inverter transformer shown in FIGS. 1 and 2.

4 is a plan view of the magnetic core portion shown in FIGS. 1 to 3.

FIG. 5 is a cross-sectional view taken along the line A-A of the magnetic core portion shown in FIG. 4.

<Explanation of symbols for the main parts of the drawings>

1: primary winding 2: first secondary winding

3: second secondary winding 4: magnetic core

5: Primary side bobbin terminal block 6: First secondary side bobbin terminal block

7: secondary secondary bobbin terminal block 41, 42: type I core

41a, 42a: one end (of type I core) 41b, 42b: other end (of type I core)

43: type E core 44: first core portion

45: second core portion 46: third core portion

47: one end connection core portion 48: the other end connection core portion

51A, 51B, 61A, 61B, 71A, 71B: end edge 52: primary winding part

53: primary terminal holding unit 54A, 54B: primary terminal

62, 72: secondary winding unit 63, 73: secondary terminal holding unit

64A, 64B, 64C: Secondary Terminals 66A ~ 66F, 76A ~ 76F: Partition Blades

67,77: notch M ₁ : to the first party

M ₂ : 2nd ruler C ₁ ~ C ₃ : Axis

Claims (8)

A first secondary winding, a primary winding, and a second secondary winding are arranged in this order such that their respective axes are parallel with each other in parallel, and a first passing through each of the windings of the primary winding and the first secondary winding. An inverter transformer comprising: a magnetic core portion for forming a magnetic path and a second magnetic path passing through each of the windings of the primary winding and the second secondary winding: The magnetic core portion includes a first core portion disposed on an axis of the primary winding to insert the inside of the primary winding, a second core portion disposed on an axis of the first secondary winding to insert the inside of the first secondary winding; A third core portion disposed on an axis of the second secondary winding so as to penetrate the inside of the second secondary winding, and an end side connecting core portion connecting end portions of one end of the first, second and third core portions to each other; And the other end side connecting core portion connecting the ends of the other end side of the first, second and third core portions to each other; At least one of the one end side connecting core portion and the other end side connecting core portion is composed of two core members; The two core members are arranged so that each one end thereof faces each other at a predetermined interval with the axis of the primary winding interposed therebetween, and the both core parts come into contact with one end portion of the first core part. Inverter transformer. The method of claim 1, And said magnetic core portion is configured such that a cross-sectional area of said first core portion is larger than each cross-sectional area of said second and third core portions in comparison of cross sections perpendicular to said respective axes. The method of claim 1, And said magnetic core portion comprises two I-type cores and one E-type core constituting said two core members. The method of claim 3, wherein And said first E-type core is integrally formed with said first, second and third core portions and said one end side connecting core portion. The method of claim 1, And a primary side bobbin terminal block in which the primary winding is wound and held, a first secondary side bobbin terminal block in which the first secondary winding is wound and held, and a second secondary side bobbin terminal block in which the second secondary winding is wound and held. Inverter transformer. The method of claim 5, wherein The primary side bobbin terminal block includes a hollow primary side winding portion having end blades at both ends, a primary side terminal holding portion integrally formed with the primary side winding portion, and a primary side terminal held by the primary side terminal holding portion. Inverter transformer, characterized in that made. The method of claim 5, wherein The first and second secondary side bobbin terminal blocks are hollow secondary side winding portions having end blades at both ends, secondary side terminal holding portions formed integrally with the secondary side winding portions, and secondary portions held on the secondary side terminal holding portions. An inverter transformer comprising side terminals. The method of claim 5, wherein The said primary side bobbin terminal block, the said 1st secondary side bobbin terminal block, and the said 2nd secondary side bobbin terminal block are each formed, and the recessed part for alignment used as an index of the alignment when combining them mutually is formed.

Images