JP2010161260A - Inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductor having such a structure that a breakdown voltage is taken into consideration and a distance between an interconnect and an interconnect lead is taken into sufficient consideration. <P>SOLUTION: The inductor has an insulated and coated conductor wound around a drum type core 3 having flanges at both ends of a roll and made of ferrite, and the drum type core is provided with a plurality of recessed parts in outer edges of both the flanges 3a and 3b, and through-holes 5 penetrating nearly center parts of the flanges. Further, a drum type core has recessed parts 4a and 4b, and 4c and 4d in outer edges of both flanges, and is provided with a groove in a roll of the drum core and the flanges at both ends from outer peripheries almost to the center of the roll. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inductor having a high withstand voltage used in a drive circuit such as an LED for illumination.

  Lighting fixtures using LEDs that have higher efficiency and longer life than conventional lighting fixtures of incandescent lamps and fluorescent lamps have come to be used. In order to light the LED, an LED drive circuit is required.

Recently, as shown in FIG. 5, an inexpensive LED driving circuit using a DC power source obtained by rectifying a commercial AC power source has been known. Here, E is a DC power supply. For example, in the case of domestic rectification, the AC power supply is about 140 [V], and in the case of overseas, it is about 340 [V].
At both ends of the DC power supply E, an inductor L, a plurality of LEDs 11 connected in series, and a switching element Q are connected in series. The cathode of the diode D is connected to the connection point between the DC power supply E and the inductor L, and the anode of the diode D is connected to the connection point between the LED 11 and the switching element Q. A control IC 10 that controls the switching element Q is connected to the control terminal of the switching element Q.

The LED driving circuit described above has high power utilization efficiency, a simple circuit configuration, and a small number of parts.
Here, it can install simply as a lighting fixture by unitizing with the power supply which rectifies | straightens AC power supply and outputs DC voltage.

  The inductor used in the LED drive circuit is subjected to a voltage difference between the voltage of the DC power supply E and the forward voltage drop of the LED 11. In consideration of being used overseas, the inductor is required to have a withstand voltage of 600 [V] or more.

Japanese Patent Laid-Open No. 9-74224

FIG. 6 is a diagram illustrating an example of a conventional inductor. FIG. 6A is a perspective view of the inductor, and FIG. 6B is a cross-sectional view of the inductor.
As shown in the figure, the drum core 3 includes a plurality of flange portions 3a, 3b, 3c, and 3d on the winding shaft 1, and winding leads 2a and 2b are entangled on the bottom surface of the flange portion 3a at one end. A pair of terminals 6a and 6b are provided. A conducting wire insulated with a resin such as polyurethane is wound around a winding shaft 1 having a plurality of flanges. That is, the winding wire 23 is wound between the flange portions 3a and 3d, the winding wire 22 is wound between the flange portions 3d and 3c, and the winding wire 21 is wound between the flange portions 3c and 3b.

  As described above, an inductor having a high withstand voltage obtains a withstand voltage by dividing the winding into a plurality of flanges and dividing the voltage applied to the winding.

For example, when a DC voltage of 600 [V] is applied between the terminals 6a and 6b, the voltage applied to each of the windings 21, 22, and 23 is 200 [V].
The voltage 63 between the winding 23 and the winding lead 2b is 600 [V], the voltage 62 between the winding 22 and the winding lead 2b is 400 [V], and the winding 21 and the winding lead 2b. The voltage 61 between them is 200 [V]. Thus, since the winding lead 2b is applied with a high voltage according to the respective windings 23, 22, and 21, it is necessary to provide a sufficient distance between the winding lead 2b and each winding surface.
An object of the present invention is to provide an inductor having a structure in which the distance between a winding and a winding lead is sufficiently considered in consideration of withstand voltage.

Inductor of the present invention is an inductor for winding a conductive wire with insulation coating on a drum core made of ferrite having flanges at both ends of a winding shaft.
The drum-type core is characterized in that a plurality of recesses and a through-hole penetrating substantially the center of the flanges at both ends including the winding shaft in the axial direction are provided on the outer edges of both flanges.
In addition, in an inductor for winding a conductive wire with insulation coating on a drum core made of ferrite having flanges at both ends of a winding shaft,
The drum-type core is characterized in that a recess is formed on the outer edge of both flanges and a groove is provided from the outer edge of the flanges at both ends including the winding shaft toward the center.

  According to the present invention, an inductor having a structure in which the distance between the winding lead and the winding is sufficiently considered can be obtained.

It is a perspective view of the inductor which shows one Example of this invention. It is a perspective view of the drum type core of FIG. It is a perspective view of an inductor and a drum type core which show another example of the present invention. It is a perspective view of the drum type core which shows another Example of this invention. It is an example of the circuit diagram of a LED drive circuit. It is an example of the conventional inductor.

FIG. 1 is a perspective view showing an embodiment of the inductor of the present invention. FIG. 1A is a perspective view seen from below, and FIG. 1B is a perspective view seen from above. FIG. 2 is a perspective view of the drum core.
As shown in FIG. 2, the drum core 3 is made of ferrite having flanges 3 a and 3 b at both ends of the winding shaft 1. A pair of terminals 6a and 6b for winding the winding start lead 2a and the winding end lead 2b are provided on the bottom surface of the flange portion 3a of the drum core 3. Further, a pair of recesses 4a and 4b are formed on the outer edge of the flange portion 3a, and a pair of recesses 4c and 4d are formed on the outer edge of the flange portion 3b, and the through-holes penetrate the centers of the flange portions 3a and 3b and the winding shaft 1 in the axial direction. 5 is provided.

As shown in FIG. 1, in an inductor according to an embodiment of the present invention, a winding start lead 2a is entangled at the base of a terminal 6a, introduced from a recess 4a to a winding shaft 1, and a winding 2 is wound. .
The end-of-winding lead 2b is led out from the recess 4c to the upper surface of the flange portion 3b, guided to the bottom surface of the flange portion 3a through the through hole 5, and entangled with the base of the terminal 6b.
The winding start lead 2a and winding end lead 2b are electrically connected to terminals by soldering.
In the above-described inductor, the inductance value obtained by winding 100 times using a conductive wire having a wire diameter φ = 0.3 [mm] was 3 [mH].

Next, another embodiment of the inductor of the present invention is shown in FIG.
3A is a perspective view of the inductor, and FIG. 3B is a perspective view of the drum-type core.
As shown in FIG. 3, the through hole of the drum core 3 does not need to be a hole, and may be a groove 8. Others are the same as the drum-type core of FIG.
The groove 8 has a depth from the outer periphery of the flange portions 3a and 3b to the vicinity of the center of the winding shaft 1, and includes recesses 4b and 4d on the outer edges of the flange portions 3a and 3b at positions facing the grooves.

As shown in FIG. 4, the winding start lead 2a is entangled with the base of the terminal 6a provided on the bottom surface of the flange 3a of the drum core 3, introduced into the groove 8, and pulled out to the upper surface of the flange 3b. It is. The drawn winding start lead 2a is introduced into the winding shaft 1 through the recess 4d, and the winding 2 is wound.
The end-of-winding lead 2b is led out from the recess 4d and is connected to the base of the terminal 6b.

As described above, if the drum core shown in FIG. 3 is used, the winding lead can be wound after passing through the groove first, so that it is not necessary to pass the winding lead through the small through hole.
Therefore, an inductor that is easy to automate and has high productivity can be obtained.

FIG. 4 is a perspective view showing still another embodiment of the present invention.
The winding shaft of the drum-type core of the second embodiment is further provided with two other flanges 3c and 3d. The flange portions 3c and 3d include a groove 8 and a recess.
The winding is wound in three parts between each rib. At this time, the movement of the windings between the ribs moves via a recess provided in the flange. The rest of the content is the same as that of the second embodiment, and the description is omitted.

  Although the above embodiments have been described as an open magnetic circuit inductor, a drum core may be housed in a ring core to form a closed magnetic circuit inductor.

1 Winding shaft 2a, 2b Winding lead 2, 21, 22, 23 Winding 3 Drum type core 3a, 3b, 3c, 3d Eaves 4a, 4b, 4c, 4d Recess 5 Through hole 6a, 6b Terminal 8 Groove 10 Control IC
11 LED
E Power supply GND Ground L Inductor D Diode Q Switching element

Claims (3)

In an inductor that winds an insulating coating on a drum core made of ferrite having flanges at both ends of a winding shaft,
The drum type core is provided with a plurality of concave portions and outer through holes that penetrate through substantially the center portions of the flange portions including both ends of the drum core in the axial direction. In an inductor that winds an insulating coating on a drum core made of ferrite having flanges at both ends of a winding shaft,
The drum-type core is characterized in that a recess is provided on the outer edge of both flange parts, and a groove is provided from the outer edge of the flange parts at both ends including the winding shaft toward the center.   3. The inductor according to claim 1, wherein the drum-type core includes a plurality of terminals on one flange portion, and electrically connects terminals of the conductive wires.

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