JP2006032660A - Coil parts - Google Patents

Abstract

An object of the present invention is to provide a coil component in which output voltages of two secondary windings are made equal and stable with each other.
A sun-shaped closed magnetic path core having two outer magnetic legs 22 arranged in parallel so as to sandwich a middle magnetic leg 21 and a middle magnetic leg 21 are inserted into a through hole, and a primary winding 24 is provided. The primary bobbin 25 wound around the winding shaft portion, the outer magnetic leg 22 inserted into the through hole, the secondary bobbin 27 wound around the winding shaft portion, the primary winding 24 and the secondary A low-potential side terminal connected to one end of the winding, and a plurality of high-potential side terminals 29 connected to the other ends of the primary winding and the secondary winding. The cross-sectional shape of the winding shaft part of the secondary bobbin 27 and the outer magnetic leg 22 is a circular shape.
[Selection] Figure 1

Description

  The present invention relates to a coil component for voltage conversion used in various electronic devices and the like.

  Hereinafter, conventional coil components will be described with reference to the drawings.

  FIG. 17 is an exploded perspective view of a conventional coil component, and FIG. 18 is a perspective view of the coil component.

  17 and 18, the conventional coil component includes a closed magnetic path magnetic core 1, a primary bobbin 3 around which the primary winding 2 is wound and a secondary winding 4 wound around the closed magnetic path magnetic core 1. A secondary bobbin 5, a low potential side terminal 6 connected to one end of the primary winding 2 and the secondary winding 4, and a high potential side terminal 7 connected to the other end of the primary winding 2 and the secondary winding 4; It has.

  The primary bobbin 3 and the secondary bobbin 5 have winding grooves 8 for winding the primary winding 2 and the secondary winding 4, respectively. The primary bobbin 3 and the secondary bobbin 5 have a low potential side terminal 6 and A high potential side terminal 7 is formed.

  The closed magnetic path magnetic core 1 has a middle magnetic leg 10 and an outer magnetic leg 11 arranged on a flat plate-like back magnetic leg 9 facing each other, and the two back magnetic legs 9 are arranged in parallel so as to sandwich the middle magnetic leg 10 therebetween. One outer magnetic leg 11 is composed of a prismatic magnetic leg, and the other outer magnetic leg 11 is composed of two columnar magnetic legs.

  A primary bobbin 3 is combined with one outer magnetic leg 11 (prism-shaped magnetic leg) of the closed magnetic path magnetic core 1, and a secondary bobbin 5 is combined with the other two outer magnetic legs 11 (columnar magnetic legs). The middle magnetic leg 10 is provided with a gap without any combination.

  In the coil component having the above-described configuration, for example, a straight discharge lamp is connected to the low potential side terminal 6 connected to one end of the secondary winding 2 and the high potential side terminal 7 connected to the other end (two secondary windings). Two straight tube discharge lamps are connected to the line 2) and used as an inverter transformer for a backlight of a liquid crystal monitor or the like.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
Japanese Patent Laid-Open No. 2003-22917

  In the above configuration, the shapes of the two outer magnetic legs 11 arranged so as to sandwich the middle magnetic leg 10 are different from each other (one outer magnetic leg 11 has a prismatic shape and the other outer magnetic leg 11 has a cylindrical shape), Since the distance between the outer magnetic leg 11 and the other outer magnetic leg 11 is large, the magnetic flux generated from one outer magnetic leg 11 is less likely to flow equally to the two outer magnetic legs 11 (the balance is easily lost). Due to the structure of the closed magnetic circuit core 1, there is a problem that it is difficult to make the output voltages of the two secondary windings 2 equal and stable with each other.

  The present invention solves the above-described problems, and an object thereof is to provide a coil component in which the output voltages of two secondary windings are made equal and stable with each other.

  In order to achieve the above object, the present invention particularly provides a closed magnetic path magnetic core having an even number of outer magnetic legs arranged in parallel so as to sandwich the intermediate magnetic legs, and the closed magnetic path magnetic cores. Is inserted into the through hole of the primary bobbin, the outer magnetic leg of the closed magnetic path magnetic core is inserted into the through hole of the secondary bobbin, and the through hole of the secondary bobbin, the winding part of the secondary bobbin, and the The cross-sectional shape of the outer magnetic leg is circular, and the voltage output waveforms of the secondary winding wound around the secondary bobbin have the same or opposite phase.

  According to the above configuration, the closed magnetic path magnetic core has a day shape having an even number of outer magnetic legs arranged in parallel so as to sandwich the intermediate magnetic leg, and the closed magnetic path magnetic core is inserted into the through hole of the primary bobbin. In addition, since the outer magnetic leg of the closed magnetic circuit core is inserted into the through-hole of the secondary bobbin, the magnetic flux generated from the primary winding is easily induced in the secondary winding by the structure of the closed magnetic circuit core. The output voltage of the next winding can be made equal and stable with each other. In particular, by making the secondary windings the same polarity or different polarities and making the voltage output waveforms of the secondary windings the same phase or opposite phases, the output voltages of the secondary windings are made even more uniform. And can be stabilized.

  In addition, since the cross-sectional shape of the outer magnetic leg is circular, there is no corner where electric potential tends to concentrate, and short circuit can be suppressed. On the other hand, it can be maximized to improve the coupling degree, and since the cross-sectional shape of the winding shaft portion is circular, the distance between the secondary winding and the outer magnetic leg is constant, and the coupling balance can be stabilized. That is, it is possible to stabilize the coupling balance and suppress a short circuit while increasing the degree of coupling most.

  Hereinafter, a coil component according to an embodiment of the present invention will be described with reference to the drawings.

  1 is an exploded perspective view of a coil component according to an embodiment of the present invention, FIG. 2 is a perspective view of the coil component, FIG. 3 is a bottom view of the coil component, and FIG. 4 is a rear perspective view of a case used for the coil component. FIG. 5 is an equivalent circuit diagram when the coil component is used in a discharge lamp circuit, and FIG. 6 is a voltage waveform diagram showing in-phase input voltage waveforms input to two discharge lamps in the discharge lamp circuit.

  1 to 4, the coil component according to one embodiment of the present invention includes a closed-circuit magnetic core 23 having a Japanese character shape and an even number of outer magnetic legs 22 arranged in parallel so as to sandwich the middle magnetic legs 21. The intermediate magnetic leg 21 is inserted into the through hole, the primary bobbin 25 in which the primary winding 24 is wound around the winding shaft portion, the outer magnetic leg 22 is inserted into the through hole, and the secondary winding 26 is inserted into the winding shaft portion. A wound secondary bobbin 27, a low potential side terminal 28 connected to one end of the primary winding 24 and the secondary winding 26, and a plurality of high terminals connected to the other ends of the primary winding 24 and the secondary winding 26 And a potential side terminal 29.

  The closed magnetic path magnetic core 23 is formed by combining an I-shaped divided magnetic core and an E-shaped divided magnetic core, and has a through hole of the secondary bobbin 27, a winding shaft portion of the secondary bobbin 27, and an outer magnetic leg. The cross-sectional shape of 22 is circular.

  Further, the primary bobbin 25 and the secondary bobbin 27 are each provided with a dividing groove 31 partitioned by a dividing rod 30. In particular, the thickness of the dividing groove 31 provided in the secondary bobbin 27 is different from that of the secondary winding 26. The dividing groove 31 wound around the end side (high potential side) is formed so as to be thicker than the other dividing grooves 31.

  The primary bobbin 25 and the secondary bobbin 27 incorporated in the closed magnetic path magnetic core 23 are covered with a case 33 formed with an insulating wall 32 that separates the primary bobbin 25 and the secondary bobbin 27 from each other. One end of the wire 26 is arranged on the same side with respect to the closed magnetic circuit core 23 and wound in the same direction so that the phases of the voltage output waveforms 34 generated from the two secondary bobbins 27 are the same. ing.

  FIG. 5 is an equivalent circuit diagram when the coil component is used in the discharge lamp 35 circuit. One high-voltage side terminal 29 connected to the other end of the two secondary windings 26 is provided. A straight tube discharge lamp 35 is connected so that the voltage output waveforms 34 of the two secondary windings 26 have the same phase as shown in FIG. At this time, the phase can be reversed as shown in FIG.

  According to the above configuration, the closed magnetic path magnetic core 23 is formed in a Japanese character shape having an even number of outer magnetic legs 22 arranged in parallel so as to sandwich the intermediate magnetic legs 21, and the primary bobbin 25 is combined with the intermediate magnetic legs 21. Since the secondary bobbin 27 is combined with the even number of outer magnetic legs 22, the magnetic flux generated from the primary bobbin 24 is easily induced in the secondary winding 26 due to the structure of the closed magnetic path core 23. Output voltages can be made uniform and stable with each other. At this time, the output of the secondary winding 26 is further increased by setting the polarity of the secondary winding 26 to the same polarity or different polarity so that the voltage output waveforms 34 of the secondary winding 26 have the same phase or opposite phases. The voltages can be made equal and stable with each other.

  In particular, since the cross-sectional shape of the outer magnetic leg 22 is circular, there is no corner where electric potential tends to concentrate, so that short circuit can be suppressed, and the cross-sectional shape of the through-hole is circular. The coupling degree can be improved by making it the largest with respect to the area, and since the cross-sectional shape of the winding shaft portion is circular, the distance between the secondary winding 26 and the outer magnetic leg 22 is constant, and the coupling balance can be stabilized. it can. That is, it is possible to stabilize the coupling balance and suppress a short circuit while increasing the degree of coupling most.

  In addition, a case 33 that covers the primary bobbin 25 and the secondary bobbin 27 is provided, and an insulating wall 32 that separates the primary bobbin 25 and the secondary bobbin 27 is provided in the case 33, so that the primary wound around the primary bobbin 25 is provided. Insulation between the winding 24 and the secondary winding 26 wound around the secondary bobbin 27 can be accurately achieved.

  Further, since the primary bobbin 25 and the secondary bobbin 27 are provided with the dividing grooves 31 partitioned by the dividing rod 30, the number of turns of the primary winding 24 wound around the primary bobbin 25 is set to the primary bobbin 25. Even if there is little, it can be evenly wound without deviation, and the secondary bobbin 27 is short-circuited on the low potential side and the high potential side of the secondary winding 26 wound around the secondary bobbin 27. Can be suppressed.

  In particular, since the thickness of the split groove 31 that winds the other end side (high potential side) of the secondary winding 26 is made thicker than the thickness of the other split grooves 31, it passes through the secondary bobbin 27. A short circuit occurring between the closed magnetic circuit core 23 and the secondary winding 26 can be suppressed.

  Then, by forming a plurality of low potential side terminals 28 connected to one end of the secondary winding 26 and high potential side terminals 29 connected to the other end of the secondary winding 26, for example, as shown in FIG. Two straight discharge lamps 35 can be connected to each of the two high potential side terminals 29 to which the other end of one or the other secondary winding 26 is connected, and the output voltage is also in phase. It can be.

  Further, as shown in FIG. 9, one high potential side terminal 29 to which the other end of one secondary winding 26 is connected and one high potential side to which the other end of the other secondary winding 26 is connected. One straight tube discharge lamp 35 can be connected to the terminal 29 one by one and connected as a total of two straight tube discharge lamps 35, and the output voltages can also be in opposite phases. In this case, in particular, the two straight tube discharge lamps 35 can be stably operated.

  In the embodiment of the present invention, the discharge lamp 35 is a straight tube, but it may be a U-shaped discharge lamp 35 as shown in FIG. The other end of the secondary winding 26 is connected to the other secondary winding 26 so that the output voltage waveforms output from the two secondary windings 26 are in opposite phases as shown in FIG. Also good. As a result, the potential difference between the voltages output from one secondary winding 26 and the other secondary winding 26 can be maximized, and a discharge lamp with high power consumption, such as a U-shaped discharge lamp 35. 35 can be easily connected and operated.

  Further, in the embodiment of the present invention, the closed magnetic path core 23 is formed by combining the I-shaped divided magnetic core and the E-shaped divided magnetic core. However, as shown in FIG. The height of the outer magnetic leg 22 is made higher than the height of the magnetic leg of the closed magnetic path magnetic core incorporated in the primary bobbin 25 or the secondary bobbin 27, or this E-shaped shape is formed as shown in FIG. Two divided magnetic cores may be combined.

  Further, as shown in FIG. 14, four U-shaped split magnetic cores may be combined, and as shown in FIG. 15, using a primary bobbin 25 having two through holes, as shown in FIG. The primary bobbin 25, the secondary bobbin 27, the case 33, and the split magnetic core may be combined to form.

  As described above, the coil component according to the present invention can equalize and stabilize the output voltages of the two secondary windings, and can be applied to a coil component for voltage conversion used in various electronic devices.

The disassembled perspective view of the coil components in one embodiment of this invention Perspective view of the coil component Bottom view of the coil component Rear perspective view of the case used for the coil component Equivalent circuit diagram when the same coil component is used in a discharge lamp circuit Voltage waveform diagram showing in-phase output voltage waveforms input to two discharge lamps in the same discharge lamp circuit Voltage waveform diagram showing output voltage waveforms of opposite phases input to two discharge lamps in the same discharge lamp circuit Another equivalent circuit diagram when the coil component is used in a discharge lamp circuit Another equivalent circuit diagram when the coil component is used in a discharge lamp circuit Another equivalent circuit diagram when the coil component is used in a discharge lamp circuit Voltage waveform diagram showing the output voltage waveform of the reverse phase input to the discharge lamp in the same discharge lamp circuit A perspective view of a split magnetic core of a closed magnetic circuit core used for other coil components A perspective view of a split magnetic core of a closed magnetic circuit core used for other coil components A perspective view of a split magnetic core of a closed magnetic circuit core used for other coil components Perspective view of primary bobbin and secondary bobbin used for other coil parts Exploded perspective view of other coil parts An exploded perspective view of a conventional coil component Perspective view of the coil component

Explanation of symbols

21 Middle magnetic leg 22 Outer magnetic leg 23 Closed magnetic path core 24 Primary winding 25 Primary bobbin 26 Secondary winding 27 Secondary bobbin 28 Low potential side terminal 29 High potential side terminal 30 Dividing rod 31 Dividing groove 32 Insulating wall 33 Case 34 Output voltage waveform 35 Discharge lamp

Claims (5)

A closed magnetic path magnetic core, a primary bobbin and a secondary bobbin in which the closed magnetic path magnetic core is inserted into a through-hole, and a primary winding and a secondary winding are wound around respective winding shafts; and the primary winding and the secondary A low potential side terminal connected to one end of the winding, and a high potential side terminal connected to the other end of the primary winding and the secondary winding, and the closed magnetic circuit core is parallel to sandwich the middle magnetic leg It is in the shape of a Japanese character having an even number of arranged outer magnetic legs, the middle magnetic leg of the closed magnetic path magnetic core is inserted into the through hole of the primary bobbin, and the outer magnetic leg of the closed magnetic path magnetic core is inserted into the secondary bobbin The secondary bobbin is inserted into the through-hole of the secondary bobbin and the cross-sectional shape of the through-hole of the secondary bobbin, the winding shaft portion of the secondary bobbin and the outer magnetic leg is circular, and the secondary bobbin is wound around the secondary bobbin Coil parts in which the phase of the voltage output waveform of the winding is the same or opposite to each other. The coil component according to claim 1, wherein a case that covers the primary bobbin and the secondary bobbin is provided, and an insulating wall that separates the primary bobbin and the secondary bobbin is provided on the case. The coil component according to claim 1, wherein the primary bobbin and the secondary bobbin are provided with a dividing groove partitioned by a dividing rod. 2. The secondary bobbin according to claim 1, wherein the secondary bobbin is provided with a split groove partitioned by a split rod, and the thickness of the split groove wound around the other end side of the secondary winding is larger than the thickness of the other split grooves. Coil parts. The coil component according to claim 1, wherein a plurality of the low potential side terminals connected to one end of the secondary winding and a plurality of the high potential side terminals connected to the other end of the secondary winding are formed.

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