KR940011697B1 - Chip-type capacitor for eliminating noise according to electromagnetic wave - Google Patents

Abstract

The capacitor has an improved configuration of internal electrode. It has internal electrodes (4) on the top and bottom connected to ground taps (6',6"), and multiple numbers of internal electrode layer groups. The internal electrode layer group includes an internal electrode (2) for signal flow, and two internal electrodes (3',3") for noise flow-out, each of which is connected to different ground electrode. The heat generation in the capacitor is low.

Description

Chip Capacitors for Electromagnetic Noise Cancellation

1 is an internal electrode shape and a laminated structure diagram of a conventional three-terminal chip capacitor.

2 is a perspective view of a three-terminal chip capacitor.

3 is an electrical equivalent circuit diagram of a three-terminal chip capacitor.

4 is an internal electrode shape and a laminated structure of an embodiment according to the present invention.

5 is a view illustrating the formation of an internal electrode according to an embodiment of the present invention.

6 is an internal electrode shape and a laminated structure diagram of an embodiment according to the present invention.

* Explanation of symbols for main parts of the drawings

1 dielectric 2 internal electrode for signal line

3 ', 3 ", 4: Internal electrode for ground 5', 5": External terminal

6, 6 ": Ground terminal 7 ', 7": Signal line

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type capacitor for removing electromagnetic noise, and more particularly, to a chip type capacitor for removing electromagnetic noise with improved internal electrode shape.

In general, a capacitor is used between the signal line and the ground to remove noise included in the signal line by electronic devices such as a computer communication device to the ground. However, once the two-terminal capacitor has a large inductance, the high-frequency noise can not be effectively removed, so the three-terminal capacitor is used.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The prior art will be described in detail with reference to FIGS. 1 to 3, wherein FIG. 1 is an internal electrode shape and a laminated structure diagram of a conventional three-terminal chip capacitor, and FIG. 2 is a perspective view of a three-terminal chip capacitor. 3 is an equivalent circuit diagram of FIG.

In the drawings, 1 is a dielectric, 2 is an internal electrode for signal lines, 3 ', 3 "and 4 are connected to ground, and grounded electrodes 5', 5" are external terminals, 6 'and 6 "are used as a path for high frequency noise. Ground terminals 7 'and 7 "respectively represent signal lines.

First, in FIG. 1, the internal electrode 2 is an internal electrode that is electrically connected to the external terminal 5 ', 5 "of the 3-terminal chip capacitor of FIG. 2 and used as a part of a signal line for transmitting a signal.

The internal electrodes 3 'and 4 are internal electrodes used as a path of high frequency noise removed by being connected to the ground terminals 6' and 6 ", and are stacked with two internal electrodes to reduce the equivalent series resistance of the internal electrodes. It is a stacked structure of three-terminal chip type capacitors. These three-stage capacitors are inserted between signal lines 7 'and 7 "to remove high frequency noise flowing to the signal lines.

An electrical equivalent circuit of such a three-terminal chip capacitor is shown in FIG.

In FIG. 3, the coil Lp and the resistor Rp are inductance and resistance components of the internal electrode used as part of the signal line, respectively, and the coil Ls and the resistor Rs are connected to the ground, and the inductance and resistance components of the internal electrode used as a path of high frequency noise. Respectively. Capacitor C is a capacitance caused by a dielectric between an internal electrode 2 used as a signal line and an internal electrode 3 'connected to ground, where G is an equivalent parallel conductance inversely of the dielectric resistance. In order to reduce the equivalent series resistance of the internal electrode 3 'connected to the ground, the equivalent series resistance, which is a real part of the device impedance by the internal electrode 3', must be reduced. And considering that the internal electrode material of the 3-terminal chip type capacitor occupies about 50-80% of the manufacturing cost, the manufacturing cost should be reduced by reducing the area of the internal electrode.

However, the conventional chip type capacitors have many problems such as heat generation due to high frequency noise to be removed and an increase in temperature and a large area of internal electrodes requiring expensive materials.

Therefore, an object of the present invention is to improve the shape stacking shape of the internal electrode connected to the ground in the electromagnetic noise canceling capacitor to increase the insertion loss of high frequency noise at the same capacitance, and to suppress the generation of heat and the temperature rise due to power consumption. It is an object of the present invention to provide a chip type capacitor for eliminating electromagnetic noise by reducing the series resistance and inductance and reducing the manufacturing cost by using less capacitor internal electrodes.

In order to achieve the above object, the present invention provides an internal electrode used as part of a signal line and an internal electrode connected to ground, which are stacked in a plurality of layers with a dielectric interposed therebetween, and an external terminal connected to a signal line and a ground terminal connected to a ground line. In the three-terminal chip type capacitor having a, it is laminated between a set of grounding electrode means, the set of grounding electrode means connected to each of the two ground terminals and stacked on the uppermost layer and the lowermost layer, and is laminated at least one set or more A high frequency stacked between the signal line electrode means used as part of the signal line and the two signal line electrode means constituting the pair of the signal line electrode means, each of which at least two electrodes are alternately connected to only opposite ground terminals An electrode means is provided as a noise passage.

In addition, the present invention is laminated in a plurality of layers with an internal electrode used as part of the signal line and the dielectric of the internal electrode connected to the ground interposed therebetween, and having an external terminal connected to the signal line and a ground terminal connected to the ground line In a terminal chip type capacitor, a pair of grounding electrode means connected to both ground terminals and stacked on the uppermost layer and the lowermost layer, and stacked between the set of grounding electrode means, are stacked at least one set to be used as part of a signal line Each one of the signal line electrode means and the two signal line electrode means constituting the pair of the signal line electrode means is stacked one by one, and the electrodes stacked between the signal line electrode means of each set are connected only to the opposite ground terminal alternately Characterized in that it comprises an electrode means for a high frequency noise passage so formed Shall be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 shows the internal electrode shape and the laminated structure of an embodiment according to the present invention.

In the drawings, 1 is a dielectric, 2 is a signal line internal electrode, and 3 ', 3 ", and 4 are ground internal electrodes connected to ground and used as a path for high frequency noise, respectively.

First, in FIG. 4, the innermost electrodes 4 'and 4 "of the uppermost layer and the lowermost layer make the potentials of the inner electrodes 3' and 3" connected to the ground coincide, and when the three-terminal chip type capacitor is actually used, Even if one ground terminal (6 'or 6 ") of the terminal chip type capacitor is short-circuited from the ground line, the ground terminals (6' and 6 'in FIG. 2) on both sides are provided so that the internal electrodes 3' and 3" can function. Connect them all.

However, two or more internal electrodes 3 'and 3 "stacked between the internal electrodes 2 used as part of the signal line and connected to the ground terminals are alternately disposed on one ground terminal 6', alternately opposite to each other. By forming the internal electrode so as to be connected only to 6 "), the currents flowing from the internal electrode 3 'and the internal electrode 3" are opposed to each other, so that the electromagnetic fields cancel each other and reduce the equivalent series resistance at high frequencies. The inductance is also reduced.

In the above embodiment, as shown in FIG. 4, the internal electrodes 3 'and 3 "are recessed in a portion perpendicular to the signal line internal electrode 2 by recessing a portion of the internal electrodes 3' and 3" in the T-shape. This is to obtain the effect described in Figure 5, which will be described in more detail in another embodiment of the present invention.

5 illustrates an internal electrode shape, which is another embodiment of the present invention, which can be replaced with the internal electrodes 3 'and 3 "of FIG. In use, the same effective area as in the prior art has no reduction in capacitance, and as the frequency increases, the equivalent series resistance of the device can be reduced a lot, thereby preventing the generation of heat and the temperature rise due to power loss. 3 ", 3 ") are further formed at right angles.

6, which is another embodiment of the present invention, is described in detail as follows. A structure in which the internal electrodes 3 'or 3 "connected to the ground are allotted and stacked between the internal electrodes 2 operated as signal lines, and each signal line is stacked between the internal electrodes 2 for the high frequency noise passage. The internal electrodes are formed such that the electrodes 3 'or 3 "are alternately connected to only one ground terminal 6' or 6" in opposite directions, so that the electromagnetic fields due to the current flowing through the internal electrodes are canceled with each other so as to be equivalent in series at a high frequency. Reduces resistance and inductance.

In this embodiment, the same electrode as the internal electrodes 3 'and 3 "of FIG. 4 was used.

Therefore, the present invention as described above has the following effects.

Although the internal electrode material is used less, the effective electrode area which determines the capacitance by the internal electrode used as part of the signal line and the internal electrode connected to the ground is the same.Therefore, there is no reduction in capacitance.The higher the frequency, the equivalent series resistance of the device It can reduce a lot and prevent heat generation and temperature rise by power loss. In addition, the inductance of the internal electrode connected to the magazine at a high frequency is also greatly reduced, and the impedance at the high frequency is small, which is advantageous to remove the electromagnetic noise. In addition, the use of less expensive internal electrode material can reduce the manufacturing cost.

Therefore, the chip type capacitor for removing electromagnetic noise of the present invention can obtain a great effect when it is used for high frequency noise removal which is a problem in signal lines of electronic devices such as computers and communication devices.

Claims (4)

The internal electrode used as part of the signal line and the internal electrode connected to the ground are stacked in multiple layers with a dielectric interposed therebetween, and the external terminals 5 'and 5 "connected to the signal line and the ground terminal connected to the ground line 6 A three-terminal chip type capacitor having a 6 '), comprising a set of grounding electrode means 4 connected to the both ground terminals 6' and 6 "and stacked on the uppermost layer and the lowermost layer, respectively. Stacked between the grounding electrode means, at least one pair or more stacked between the signal line electrode means (2) used as part of the signal line and the two signal-only electrode means forming a pair of the signal line electrode means, respectively, at least Capacitive electrons characterized in that each of the two or more electrodes are provided with electrode means (3 ', 3 ") for the high-frequency noise passage formed so as to be connected to only the opposite ground terminal alternately, respectively. Chip-type capacitor for noise removal. The internal electrode used as part of the signal line and the internal electrode connected to the ground are stacked in multiple layers with a dielectric interposed therebetween, and the external terminals 5 'and 5 "connected to the signal line and the ground terminal connected to the ground line 6 A three-terminal chip type capacitor having a 6 '), comprising a set of grounding electrode means 4 connected to the both ground terminals 6' and 6 "and stacked on the uppermost layer and the lowermost layer, respectively. Stacked between at least one pair of grounding electrode means, each of which is stacked between at least one pair of signal line electrode means (2) used as a part of a signal line and between two signal line electrode means constituting a pair of the signal line electrode means; Electrode means for the high frequency noise passage (3 ', 3 ") is formed so that the electrodes stacked between each set of signal line electrode means are alternately connected only to opposite ground terminals. Chip-type capacitor for electromagnetic wave noise reduction, characterized by. The method according to claim 1 or 2, wherein the electrode means (3 ', 3 ") for the electromagnetic noise path is deeply recessed in a direction perpendicular to the internal electrode (2) for the signal line at a portion of the connection portion in the T-shape. A chip type capacitor for removing electromagnetic noise, characterized in that it is formed of an uneven portion. 3. The electromagnetic wave noise passage electrode means (3b ', 3b ") further extends at right angles by further extending the recessed concave-convex portions already formed in the connecting portion in the T-shape. Chip capacitors for noise reduction.