KR102360961B1 - Power inductor - Google Patents

Abstract

A power inductor is provided. A power inductor according to an embodiment of the present invention includes a body including a pair of side plates and a winding unit coupled therebetween; a flat coil wound on a winding unit; and an upper plate coupled to one side of the pair of side plates to form a magnetically closed circuit.

Description

Power inductor

The present invention relates to an inductor, and more particularly, to a power inductor capable of facilitating impedance matching while lowering a DC resistance (Rdc) formed by a coil.

Recently, technological development for maximizing convenient functions of a vehicle, such as autonomous driving, has been rapidly made. By providing these convenient functions based on image information, more useful or convenient functions may be provided.

Accordingly, the adoption of cameras in vehicles is rapidly expanding. For example, the use of various types of cameras, such as a rear-view camera, a camera for lane recognition, a camera for around view, and a camera for replacing a side mirror, is rapidly increasing.

On the other hand, since the camera requires many connection cables, such as a data line, a control line, and a power line, the increase in the adoption of a camera causes an increase in the overall weight of a vehicle and an increase in cost.

Therefore, as a measure to further reduce the weight and cost of the vehicle, a PoC (Power Over Coax) technology that transmits and receives a power line, a signal line, and a control line in one line has recently appeared, and the market is expanding accordingly. have.

In order to apply this PoC technology, an inductor is placed in series so that no signal is introduced into the power line to separate the data signal and the power signal. Furthermore, to reduce space, a PoC filter has been developed that is configured to use a series inductor as one inductor. This inductor is wound in three layers to lower the direct current resistance (Rdc) and to realize the desired impedance.

However, due to such multiple windings, if the position of the windings for each layer is changed, the desired impedance cannot be realized because the density of the coil is not uniform even in the unit area. Due to the increase, the mass productivity is declining.

KR 10-2014-0001102 A (2014.01.06 open)

The present invention has been devised in view of the above points, and by increasing the density per unit area of the coil and making the winding single-layered, to provide a power inductor that can reduce direct current resistance (Rdc) and easily perform impedance matching. There is a purpose.

Another object of the present invention is to provide a power inductor that can be protected from static electricity while separating a data signal and a power signal by adding an electrostatic protection function.

In order to solve the above problems, the present invention provides a body including a pair of side plates and a winding unit coupled therebetween; a flat coil wound on the winding unit; and an upper plate coupled to one side of the pair of side plates to form a magnetically closed circuit.

According to a preferred embodiment of the present invention, the winding portion may be coupled to connect between the central portions of the pair of side plates.

In addition, the main body and the upper plate may include a Ni-Zn-Cu-based ferrite magnetic powder having a relative magnetic permeability of 500 to 1500.

In addition, a protrusion for adjusting the micro-gap may be provided at the coupling portion of the side plate and the upper plate.

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In addition, the upper plate may include an electrostatic protection unit connected in parallel with the flat coil.

In this case, the upper plate may include a pair of electrodes extending from the side of the pair of side plates and spaced apart from each other at regular intervals.

Here, in the side plate, a connection electrode for connecting one of the pair of electrodes and the flat coil may be disposed in a longitudinal direction of one surface thereof.

In addition, each of the pair of electrodes may have one side facing each other having a smaller width than the other side.

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In addition, the side plate may be provided with a groove portion at a lower portion, and one end of the flat coil may be disposed in the groove portion.

In this case, external electrodes may be provided on the entire lower portion of the side plate.

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According to the present invention, by winding the flat coil in a single layer, the direct current resistance (Rdc) can be reduced and impedance matching can be easily performed at the same time, thereby simplifying the manufacturing process and eliminating the need for separate equipment for winding precision, thereby improving manufacturing efficiency can be improved

In addition, the present invention can provide a function of separating a data signal and a power signal and a function of protecting the static electricity at the same time by providing the static electricity protection unit in parallel with the coil of the inductor. can improve

1 is a perspective view of a power inductor according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of the main body and the upper plate before the formation of the external electrode in Figure 1;
Figure 3 is a partial perspective view of the side plate of the body after the formation of the external electrode in Figure 2;
4 is a perspective view of the upper plate in FIG. 1;
5 is a perspective view of another example of the upper plate of FIG.
6 is a cross-sectional view of the winding portion in FIG. 1;
7 is a side view of a state in which the lead-out part of the coil is disposed before forming the external electrode in FIG. 1, and;
FIG. 8 is a side view after formation of an external electrode in FIG. 7 .

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

As shown in FIGS. 1 and 2 , the power inductor 100 according to an embodiment of the present invention includes a body 110 , a flat coil 120 , and an upper plate 130 .

The power inductor 100 is a bias-tee circuit for separating a data signal and a control signal and a power signal on a power line when a data line, a control line, and a power line are used as one line in a camera module of a vehicle is an inductor. The power inductor 100 constitutes a PoC filter together with a capacitor at the transceiver terminal of the camera module and the central control device.

The body 110 includes side plates 112 and 114 and a winding portion 116 .

The side plates 112 and 114 are made of a pair, and have groove portions 112a, 112b, 114a, and 114b at the upper end and lower end. That is, the side plates 112 and 114 may be provided with grooves 112a, 112b, 114a, and 114b on both sides in the longitudinal direction, that is, at the upper and lower ends.

Here, the grooves 112a, 112b, 114a, and 114b may be provided to have a depth similar to the thickness of the flat coil 120 . At this time, the lead-out portion 120a of the flat coil 120 may be disposed in the groove portions 112a and 114a so that the lower ends of the side plates 112 and 114 form a flat surface (see FIG. 7 ).

That is, in the groove portions 112a and 114a provided at the lower ends of the side plates 112 and 114 , the lead portion 120a, which is one end of the flat coil 120, is disposed to connect the flat coil 120 to the external electrodes 102a and 102b. can be

Accordingly, the flat coil 120 can be easily welded to the side plates 112 and 114 and the external electrodes 102a and 102b by increasing the contact area compared to the annular coil.

Meanwhile, the groove portions 112b and 114b provided at the upper ends of the side plates 112 and 114 may have a shape symmetrical to the groove portions 112a and 114a provided at the lower ends. These grooves (112b, 114b) are to be formed symmetrically so that the side plates (112, 114) do not have directionality.

In this way, since the groove portions 112a, 112b, 114a, and 114b of the same shape are provided at the upper end and lower end of the side plates 112 and 114, respectively, it is not necessary to consider the directionality of the side plates 112 and 114 in the manufacturing process. can

In the present embodiment, the grooves 112a, 112b, 114a, and 114b are respectively shown and described as being provided at the upper ends and lower ends of the side plates 112 and 114, but the present invention is not limited thereto, and only the lower ends of the side plates 112 and 114 have grooves 112a, 114a. ), and the upper end of the grooves (112b, 114b) may be omitted.

The winding portion 116 is coupled to connect between the central portions of the side plates 112 and 114 (see FIG. 2 ). In this case, the winding unit 116 is coupled between the side plates 112 and 114, and may be coupled to the central portion of each of the side plates 112 and 114. In this case, the winding unit 116 may have a circular cross-section. Accordingly, the flat coil 120 may be easily wound around the winding unit 116 .

As such, since the flat coil 120 is wound around the winding unit 116 , the flat coil 120 can be wound around the body 110 in the form of a circular core, unlike the case of an annular coil composed of a square core. There is (see Figure 2).

One side of the side plates 112 and 114 may be provided with a micro-gap adjusting protrusion (see FIG. 3 ). Here, the micro-gap between the side plates 112 and 114 and the top plate 130 affects the inductance and is related to the DC superposition characteristic. At this time, since the inductance and DC overlap characteristics are in a trade-off relationship, it is necessary to appropriately manage them in the process.

For example, at one side where the side plates 112 and 114 are coupled to the top plate 130 , that is, the protrusions 112c may be provided on the upper side of the side plates 112 and 114 . Accordingly, the coupling portion between the side plates 112 and 114 and the top plate 130 may be adjusted so that a certain gap is formed between the side plates 112 and 114 and the top plate 130 .

The flat coil 120 is wound in a single layer on the winding portion 116 of the body 110 (see FIG. 6 ). Here, the flat coil is a flat coil, and is formed by forming a flat type wire or a flat type copper wire made of a metal in a coil shape.

In this case, the coil 110 may have an insulating coating on the surface. That is, the surface of the coil 110 may be coated with an insulating material so that electrical contact between the coils to be wound is blocked.

In this way, by winding the body 110 with the flat coil 120 , the DC resistance Rdc can be reduced because the density of the unit area is increased while the number of turns is reduced compared to that of the annular coil.

Moreover, by winding the coil only once using the flat coil 120, the manufacturing process can be simplified, and the impedance matching is easily implemented because the density for each unit area is the same compared to the case of the annular coil, and the impedance is formed to be the same. In addition, since high positional precision is not required during winding, the workability of the winding is excellent without the need for a separate facility, and manufacturing efficiency can be improved.

The upper plate 130 is coupled to the upper end of the pair of side plates 112 and 114 to constitute a magnetically closed circuit. That is, the upper plate 130 may form a magnetically closed circuit by acting on a path of a magnetic field generated by a current flowing through the flat coil 120 .

One surface of the upper plate 130 may be provided with protrusions 136 corresponding to the protrusions 112c of the side plates 112 and 114 . That is, the top plate 130 is coupled to the side plates 112 and 114 on one side, for example, the projection 136 may be provided on the lower surface of the top plate 130 . Accordingly, the coupling portion between the side plates 112 and 114 and the top plate 130 may be adjusted so that a certain gap is formed between the side plates 112 and 114 and the top plate 130 .

In this case, the protrusion 136 may have one of a quadrangular pyramid, a circular hemisphere, a pyramid, and a hexagon, but is not limited thereto and may have various shapes.

Here, the projections 112c and 136 are shown and described as being formed on the top plate 130 and the side plates 112 and 114, but the present invention is not limited thereto, and the projections 112c and 136 only on one of the top plate 130 and the side plates 112 and 114. ) may be provided.

Alternatively, the protrusions 112c and 136 provided on any one of the upper plate 130 and the side plates 112 and 114 are used for micro-gap adjustment, and the protrusions 112c and 136 provided on the other one may be used for coupling. . At this time, the upper plate 130 and the side plates 112 and 114 corresponding to the coupling protrusion may be provided with grooves for inserting and fixing the coupling protrusion.

The body 110 and the upper plate 130 may include Ni-Zn-Cu-based ferrite magnetic powder having a relative magnetic permeability of 500 to 1500. In this case, the body 110 and the upper plate 130 may be manufactured by dry molding using the ferrite magnetic powder as described above.

Accordingly, the main body and the upper plate 130 can form a magnetic circuit by the current flowing through the flat coil 120 .

Here, when the relative magnetic permeability is less than 500, the DC superposition characteristic is excellent because the current range in which the inductance of the power inductor 100 is kept constant is wide, but the number of turns of the flat coil 120 for implementing the same inductor increases, so the DC resistance (Rdc) increases.

In addition, when the relative magnetic permeability exceeds 1500, the number of turns of the flat coil 120 for implementing the same inductor is reduced to reduce the direct current resistance (Rdc), but the current in which the inductance of the power inductor 100 is maintained constant. The range of is narrowed and the DC superposition characteristic deteriorates.

In addition, external electrodes 102a and 102b may be provided over the entire lower portion of the side plates 112 and 114 (see FIGS. 1 and 8 ). The external electrodes 102a and 102b may be provided to be integrally formed with the lead portion 120a of the flat coil 120 in the entire lower portion of the side plates 112 and 114 by a paste dipping process. Here, the external electrodes 102a and 102b may include at least one of Ag, Ni, and Sn.

Meanwhile, the power inductor 100 according to an embodiment of the present invention may include an electrostatic protection unit connected in parallel to the flat coil 120 . Here, the static electricity protection unit may be a suppressor. That is, the static electricity protection unit may be a pair of electrodes 132 and 134 .

In addition, the pair of electrodes 132 and 134 may be provided on one surface of the upper plate 130 , for example, on the lower surface of the upper plate 130 (see FIG. 2 ). In this case, the electrodes 132 and 134 are formed to extend from the side plates 112 and 114 on the lower surface of the upper plate 130 and may be formed to be spaced apart from each other at regular intervals (see FIG. 4 ).

As described above, when the electrodes 132 and 134 are spaced apart from each other by a predetermined interval, when static electricity is introduced into the power inductor 100, it is discharged between the electrodes 132 and 134 to form a path of static electricity, thereby preventing damage to the flat coil 120. can be prevented

In this case, one side of the external electrodes 102a and 102b may be connected to the ground in the bias-tee circuit part. That is, static electricity introduced from the outside passes through the path through the electrodes 132 and 134 and is bypassed to the ground, so that the flat coil 120 can be protected from static electricity and the bias-tee circuit can be protected.

As a result, the power inductor 100 can simultaneously provide a function of separating a data signal and a power signal and a function of protecting against static electricity, thereby improving the stability of the circuit in the vicinity of the camera, where external static electricity is often introduced.

Here, the side plates 112 and 114 may be provided with connecting electrodes 104a and 104b for connecting the flat coil 120 to any one of the pair of electrodes 132 and 134 in the longitudinal direction of one surface (see FIG. 3 ). .

As described above, the connection electrodes 104a and 104b may be provided on the side plates 112 and 114 so that the protection unit and the flat coil 120 are connected in parallel. Here, the connection electrodes 104a and 104b may be formed to extend to the outer surfaces of the side plates 112 and 114 and upper ends coupled to the top plate 130 .

Accordingly, when the upper plate 130 is coupled to the side plates 112 and 114, the electrodes 132 and 134 provided on the lower surfaces of the side plates 112 and 114 are connected to the connection electrodes 104a and 104b provided on the upper end of the coupling surface of the side plates 112 and 114 via the connection electrodes 104a and 104b. Thus, it can be connected in parallel with the flat coil 120 . In this case, the connection electrodes 104a and 104b may be disposed on both sides of the grooves 112a and 112b as the center.

In this case, each of the pair of electrodes 132 and 134 may have one side and the other side facing each other to have different widths. That is, one side of the electrodes 132 and 134 may face each other, and the other sides 132a and 134a may extend to the entire side of the upper plate 130 (see FIG. 4 ).

As described above, the electrodes 132 and 134 are provided with extended portions 132a and 134a over the entire sides coupled to the side plates 112 and 114, so that the connecting electrodes 104a provided on both sides of the grooves 112a and 112b in the side plates 112 and 114 are provided. , 104b) to improve electrical contact.

As another example, the pair of electrodes 132 ′ and 134 ′ may be provided with a constant width (see FIG. 5 ). One end of the electrodes 132 ′ and 134 ′ may be provided to face each other in the central portion of the upper plate 130 , and the other end may be provided so as to be disposed on the side where the upper plate 130 is coupled to the side plates 112 and 114 .

Here, the electrodes 132 ′ and 134 ′ are not provided in a straight line, and may have bent portions so that the other end is not disposed on a straight line with the first end. That is, one end of the electrodes 132 ', 134' is disposed in the center of the upper plate 130, but the other end is provided with grooves 112a, 112b, 114a, 114b provided in the side plates 112 and 114 coupled to the upper plate 130. It may not be arranged in a straight line with one end to avoid it.

However, when the grooves 112b and 114b are not provided at the upper ends of the side plates 112 and 114 , the electrodes 132 ′ and 134 ′ may be disposed on a straight line on the top plate 130 . In this case, as shown in FIG. 3 , the connection electrodes 104a and 104b may not be disposed on both sides of the groove portion 112b, but may be provided at a position corresponding to the groove portion 112b.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

100: wave inductor 102a, 102b: external electrode
104a, 104b: connection electrode 110: body
112,114: side plate 112a, 112b, 114a, 114b: groove
112c: projection 116: winding part
120: flat coil 120a: lead out part
130: upper plate 132,134,132',134': electrode
132a, 134a: extension 136: protrusion

Claims (13)

a body including a pair of side plates and a winding unit coupled therebetween;
a flat coil wound on the winding unit; and
and an upper plate coupled to one side of the pair of side plates to form a magnetic closed circuit;
The upper plate is a power inductor including an electrostatic protection unit connected in parallel with the flat coil. The method of claim 1,
The winding portion is a power inductor coupled to connect between the central portions of the pair of side plates. The method of claim 1,
The main body and the upper plate are a power inductor comprising a Ni-Zn-Cu series ferrite magnetic powder having a magnetic permeability of 500 to 1500. The method of claim 1,
A power inductor provided with a micro-gap adjusting protrusion at a coupling portion of the side plate and the upper plate. delete The method of claim 1,
The upper plate is formed to extend from the side of the pair of side plates, the power inductor including a pair of electrodes spaced apart from each other. 7. The method of claim 6,
The side plate is a power inductor in which a connection electrode for connecting any one of the pair of electrodes and the flat coil in a longitudinal direction of one surface thereof is disposed. 7. The method of claim 6,
Each of the pair of electrodes is a power inductor in which one side facing each other has a smaller width than the other side. The method of claim 1,
The side plate is provided with a groove in the lower portion,
A power inductor having one end of the flat coil disposed in the groove portion. 10. The method of claim 9,
A power inductor having an external electrode on the entire lower portion of the side plate. delete delete delete

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