JP2006073879A - Detection resistor mounting board - Google Patents

Abstract

An object of the present invention is to provide a mounting substrate for a detection resistor that can reduce variation in resistance value even if there is variation in mounting position of the detection resistor.
A pair of lands 1 and 2 on which a detection resistor is mounted, and are electrically connected to the pair of lands 1 and 2 and extend in a direction perpendicular to the opposing direction of the pair of lands 1 and 2. A pair of power lines 3 and 4 and a pair of detection lines 5 and 6 electrically connected to the pair of lands 1 and 2, and the pair of lands 1 and 2 and the pair of power lines 3 and 4 Notches 7 and 8 are formed in the vicinity of the connecting portion from the opposing surface side of the pair of lands 1 and 2 toward the outside.
[Selection] Figure 1

Description

  The present invention mainly relates to a mounting board for a detection resistor for measuring current or voltage.

  Conventionally, a current value and a voltage value flowing in an electronic device have been measured. As this method, there is a method in which a detection resistor having a very small resistance value is inserted in series in an electronic device, and a voltage between the resistors is measured. In addition, since this voltage value is a voltage drop in the detection resistor, if the resistance value of the detection resistor is known, the current value flowing through the detection resistor, that is, the current value flowing through the electronic device. Can be detected. All of these methods are known.

As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.
JP-A-8-83969 JP 2003-121477 A

  In the conventional measurement method described above, it is preferable that the resistance value of the low resistor is small because power loss is small. The problem of becoming bigger was included.

  In the mounting board of the detection resistor, the pair of power lines cannot be extended in a direction parallel to the facing direction of the pair of lands on which the low resistor is mounted because of the arrangement of components and the pattern routing. In some cases, however, it is necessary to extend in a direction perpendicular to each other. However, in this case, there is a problem in that the resistance value to be measured varies greatly depending on the mounting state.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a mounting board for a detection resistor that can reduce variation in resistance value even if there is variation in mounting position of the detection resistor. To do.

  In order to achieve the above object, the present invention has the following configuration.

  The present invention includes a pair of lands formed on a substrate so as to face each other in order to mount a detection resistor and electrically connect to the detection resistor, and to electrically connect to the pair of lands. And a pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands, the pair of lands and the pair of power lines In the vicinity of the connection part between the pair of lands and the outer side, the cutouts are respectively formed from the opposing surface side of the pair of lands. Since the notches are formed from the opposing surface sides of the pair of lands to the outside, the current enters and exits in the direction parallel to the detection resistor, whereby the detection resistor The mounting position of the Also, those having an action effect that it is possible to reduce variations in the voltage or current value detected between the pair of detection lines.

  In addition, a pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor, and the pair of lands are electrically connected, And a pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, a pair of detection lines electrically connected to the pair of lands, and a connection electrically connected to the pair of lands. Each of the pair of lands and the pair of power lines is formed in the vicinity of the connection portion between the pair of lands and the pair of power lines, and the notches are formed outward from the opposing surface side of the pair of lands. The detection resistor is extended to the same position as the detection resistor or to the outside, and according to this configuration, in the vicinity of the connection portion between the pair of lands and the pair of power lines, the opposing surface side of the pair of lands Cut it outward from it And the notch extends to the same position as the detection resistor or to the outside of the detection resistor, so that the current enters and exits from the direction parallel to the detection resistor. Thus, even if there is a variation in the mounting position of the detection resistor, there is an effect that the variation in the voltage or current value detected between the pair of detection lines can be reduced.

  In addition, a pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor, and the pair of lands are electrically connected, And a pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands, the pair of lands being the pair of power lines. And a pair of lands extending so as to protrude toward the opposite sides of the pair of lands. According to this configuration, the pair of lands are connected between the pair of power lines and the pair of lands. Since each of them extends from the connecting portion so as to protrude to the opposite side of the pair of lands, the current enters and exits from the direction parallel to the detection resistor. Even if the mounting position varies And it has a effect that it is possible to reduce variations in the voltage or current value detected between the pair of detection lines.

  In addition, a pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor, and the pair of lands are electrically connected, And a pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands, the pair of lands being the pair of power lines. It extends so as to protrude to the opposite side of the pair of lands than the connection part of the pair of lands, and is mounted by electrically connecting a detection resistor to the extended part, According to this configuration, the pair of lands are respectively extended so as to protrude from the connection portion between the pair of power lines and the pair of lands to the opposite side of the pair of lands, and detected in the extended portion. For electrical connection Therefore, the current enters and exits from the direction parallel to the detection resistor, and even if the mounting position of the detection resistor varies, the voltage or current value detected between the pair of detection lines This has the effect that the variation can be reduced.

  As described above, the mounting board of the detection resistor of the present invention is a pair of opposingly formed on the board for mounting the detection resistor and electrically connecting to the detection resistor. A land, a pair of power lines electrically connected to the pair of lands and extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands And a notch is formed in the vicinity of the connection portion between the pair of lands and the pair of power lines from the opposing surface side of the pair of lands to the outside, so that the current is parallel to the detection resistor. In this way, even if there is variation in the mounting position of the detection resistor, variation in the voltage or current value detected between the pair of detection lines can be reduced. Has an excellent effect It is intended.

(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a plan view of the main part of the mounting board of the detection resistor according to Embodiment 1 of the present invention, and FIG. 2 is the main part of the mounting board on which the detection resistor according to Embodiment 1 of the present invention is mounted. It is a top view. 1 and 2, the entire mounting board is not shown, and the mounting board corresponds to the background of FIGS.

  1 and 2, reference numerals 1 and 2 denote a pair of lands formed on the mounting substrate so as to face each other with a space therebetween, and a detection resistor 9 described later is mounted on the pair of lands 1 and 2. The Reference numerals 3 and 4 denote a pair of power lines electrically connected to the pair of lands 1 and 2. The pair of power lines 3 and 4 are connected to a power source (not shown) and the other is connected to an electric circuit. It is connected to the upper load (not shown) side, and is a wiring for supplying electric power to the load. The pair of power lines 3 and 4 extend in a direction perpendicular to the opposing direction of the pair of lands 1 and 2. Reference numerals 5 and 6 denote a pair of detection lines electrically connected to the pair of lands 1 and 2. The pair of detection lines 5 and 6 are voltages between the pair of lands 1 and 2, that is, a detection line described later. It is a wiring for measuring the voltage drop of the resistor 9. Reference numerals 7 and 8 denote notches formed in the vicinity of the connecting portion between the pair of lands 1 and 2 and the pair of power lines 3 and 4. The notches 7 and 8 are surfaces on which the pair of lands 1 and 2 face each other. It is formed from the outside toward the outside. Reference numeral 9 denotes a detection resistor. The detection resistor 9 is electrically connected to the pair of lands 1 and 2 and mounted on a mounting board (not shown).

In the figure, L ₁ is the length of the detection resistor 9, and L ₂ is the length between the outermost portions of the notches 7 and 8. Here, the detection resistor 9 is located between the outermost portions of the notches 7 and 8. That is, the region represented by L ₁ is inside the region represented by L ₂ . By adopting such a configuration, even if the mounting position of the detection resistor 9 varies, the variation in resistance value measured between the pair of detection lines 5 and 6 is reduced.

  The characteristics of the mounting board of the detection resistor according to the first embodiment of the present invention configured as described above were tested in order to compare with the comparative example. Hereinafter, this test will be described.

  In the test, the detection resistor mounting board in the first embodiment of the present invention and the detection resistor mounting board in the comparative example are connected to the pair of lands 1 and 2 of the pair of detection lines 5 and 6, respectively. The test was performed while changing the position and varying the width of the pair of lands 1 and 2.

  First, the mounted substrate that has been tested will be described.

  3, 4 and 5 are plan views of the main part of the mounting board of the detection resistor in the first embodiment of the present invention. In these drawings, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted. The symbol W in the figure is the width of land 1 and land 2.

  Here, the mounting substrate of the detection resistor shown in FIG. 3 is configured so that the connection position of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 is cut above the plane of the pair of lands 1 and 2, that is, cut. The position is close to the notches 7 and 8.

  On the other hand, the mounting board of the detection resistor shown in FIG. 4 has the connection position of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 approximately at the center in the vertical direction of the paper surface of the pair of lands 1 and 2. It is what.

  In addition, the detection resistor mounting substrate shown in FIG. 5 has the connection positions of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 below the pair of lands 1 and 2, that is, the notches. 7 and 8 are located far from each other.

  6, 7 and 8 are plan views of the main part of the mounting board of the detection resistor in the comparative example.

  Here, the mounting substrate of the detection resistor shown in FIG. 6 is configured so that the connection position of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 is cut above the plane of the pair of lands 1 and 2, that is, cut. The position is close to the notches 7 and 8.

  On the other hand, in the detection resistor mounting board shown in FIG. 7, the connection position of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 is approximately the center of the pair of lands 1 and 2 in the vertical direction of the paper surface. It is what.

  Further, the mounting board of the detection resistor shown in FIG. 8 has a connection position of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 below the paper surface of the pair of lands 1 and 2, that is, a notch. 7 and 8 are located far from each other.

  In any of the mounting boards, the test was conducted on three types of land 1 and 2 having a width W of 5 mm, 7 mm, and 10 mm. The cutout depths of the cutouts 7 and 8 of the mounting substrate in FIGS. 3 to 5 are both 2 mm.

  A resistance value detected by the pair of detection lines 5 and 6 when a resistor of 1 mΩ is mounted on the mounting board of these detection resistors and a current is passed between the pair of power lines 3 and 4 is a four-terminal method. It was measured by.

  FIG. 9 illustrates the test results of the mounting board of the detection resistor in FIGS. 3 to 5. In FIG. 9, “upper”, “middle”, and “lower” indicate the pair of detection lines 5 and 6, respectively. This means the connection position to the pair of lands 1 and 2. Specifically, “upper” is the mounting board of the detection resistor shown in FIG. 3, “middle” is FIG. 4, and “lower” is FIG. The test results are shown. Further, the horizontal axis of FIG. 9 is the value (mm) of the width W of the pair of lands 1 and 2, and the vertical axis indicates the measured value (mΩ) of the resistance between the pair of detection lines 5 and 6. .

  Similarly, FIG. 10 shows the test results of the mounting board of the detection resistor in FIGS. 6 to 8, where “upper” is shown in FIG. 6, “middle” is shown in FIG. 7, and “lower” is shown in FIG. The test result of the mounting board of the detection resistor is shown.

  As is clear from comparison between FIG. 9 and FIG. 10, when the notches 7 and 8 are provided, even when the connection positions of the pair of detection lines 5 and 6 to the pair of lands 1 and 2 are changed. The resistance value does not vary. On the other hand, when the notches 7 and 8 are not provided, the resistance value varies. This means that when the notches 7 and 8 are not provided, the resistance value varies depending on the measurement positions of the pair of lands 1 and 2. The reason for this is speculation, but it can be considered as follows.

  If one of the power lines 3 is on the positive side and the other power line 4 is on the negative side, and there are no notches 7 and 8, the current flows on the mounting board of the detection resistor shown in FIGS. The current that flows from top to bottom and enters the detection resistor 9 from the top of the paper surface of the land 1 and the current that enters the detection resistor 9 from the bottom of the paper surface of the land 1 are in a current flow path. The voltage drop is considered to be different due to the difference. This state is shown in FIG. FIG. 11 is a simple equivalent circuit diagram of the comparative example. In FIG. 11, reference numeral 10 denotes a resistor, and the resistor 10 is a resistor near the pair of power lines 3 and 4 in the detection resistor 9. Reference numeral 11 denotes a resistance in the central portion of the detection resistor 9, and reference numeral 12 denotes a resistance in a portion far from the pair of power lines 3 and 4 in the detection resistor 9. Reference numerals 13, 14, 15 and 16 denote resistances at the electrode portions of the respective detection resistors 9. As described above, in the comparative example, the resistance value occupied by the electrode portion of the detection resistor 9 differs depending on the measurement positions in the pair of lands 1 and 2, and the resistance value of the electrode portion of the detection resistor 9 is included above the paper surface. Since there is no resistance, the resistance value is lowered, thereby increasing the current density and increasing the resistance value due to the voltage drop. On the other hand, since resistance by the electrode of the detection resistor 9 is added below the plane of the paper, the resistance value increases, thereby reducing the current density, thereby reducing the voltage drop at the detection point, thereby reducing the resistance value. This appears to be because the resistance value varies depending on the measurement position.

  On the other hand, in the detection resistor mounting substrate shown in FIGS. 3 to 5, the current flows from the top to the bottom of the paper. However, since the notches 7 and 8 exist, the current remains as it is. Since it cannot enter the detector 9 and bypasses the notches 7 and 8 and enters the detection resistor 9, it flows from the left to the right of the page when entering the detection resistor 9. . Although an equivalent circuit in this case is not shown, it is considered to be a simple parallel circuit of resistors.

  Here, the difference in resistance value due to the difference in measurement position between the pair of lands 1 and 2 means that the resistance value varies depending on the difference in position with respect to the detection resistor 9. This causes a difference in resistance value due to variations in mounting position.

  When the resistance value measured between the pair of detection lines 5 and 6 is different, the voltage value or current value measured here is also different. That is, the voltage value or the current value varies depending on the mounting position of the detection resistor 9.

  In FIG. 9, when the width W of the pair of lands 1 and 2 is increased, the variation in resistance value is reduced. This is because when the width W of the pair of lands 1 and 2 is narrow, the current is a pair. However, if the width W of the pair of lands 1 and 2 is wide, the current can sufficiently wrap around the bottom of the pair of lands 1 and 2. I think that. In this respect, the width W of the pair of lands 1 and 2 is preferably wide. However, as shown in FIG. 9, if the width W is 7 mm or more, the resistance value does not vary. A width W of 7 mm is considered sufficient.

  The manufacturing method of the mounting board of the detection resistor in the first embodiment of the present invention as described above is basically the same as the manufacturing method of a general mounting board known in the art. It is only necessary to form the notches 7 and 8. As a method for forming the notches 7 and 8, the lands 1 and 2 having no notches are once formed, and then the notches 7 and 8 are formed by etching or laser cutting, or the notches 7 and 8 are formed in advance. Although there is a method of doing so, any of them can be performed using a known technique.

  The detection resistor mounting board according to the first embodiment of the present invention is arranged in the same direction on the pair of power lines 3 and 4 and the pair of lands 1 and 2. Also good.

  That is, FIG. 12 shows a variation diagram of the mounting board of the detection resistor in the first embodiment of the present invention. The reference numerals in the figure are the same as those in FIG. 1, and the description thereof is omitted here. 12 is different from the mounting board shown in FIG. 1 in that the mounting board shown in FIG. 1 has one power line 3 and the other power line 4 extending in the same direction. In the mounting board shown, one power line 3 and the other power line 4 are extended in different directions, and even with such a configuration, the same effect as the mounting board shown in FIG. is there.

In the first embodiment of the present invention, the notches 7 and 8 extend to the outside of the detection resistor 9, but extend to the same length position as the detection resistor 9. that so as to set, i.e., in the case where the structure provided with notches 7, 8 so that the L ₁ and L ₂ in FIG. 2 coincide, the same effects as in the first embodiment of the present invention There is an effect.

(Embodiment 2)
Hereinafter, the second and second embodiments of the present invention will be described.

  FIG. 13 is a plan view of the main part of the mounting board of the detection resistor according to the second embodiment of the present invention, and FIG. 14 is the main part of the mounting board on which the detection resistor according to the second embodiment of the present invention is mounted. It is a top view. In FIGS. 13 and 14, the entire mounting board is not shown, and the mounting board corresponds to the background of FIGS.

  13 and 14, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted. A portion 17 surrounded by an alternate long and short dash line is a connection portion that electrically connects one land 1 and one power line 3. Further, a portion 18 surrounded by a one-dot chain line is a connection portion that electrically connects the other land 2 and the other power line 4. Here, the connecting portion 17 is located outside the surface of the one land 1 that faces the other land 2. Similarly, the connecting portion 18 faces the one land 1 of the other land 2. It is located outside the surface to be. That is, in the second embodiment of the present invention, as shown in FIGS. 13 and 14, the pair of lands 1 and 2 are connected to the connection portions 17 and 18 between the pair of power lines 3 and 4 and the pair of lands 1 and 2. Are extended so as to protrude to opposite sides of the pair of lands 1 and 2, and a detection resistor 9 is electrically connected and mounted on the extended portion as shown in FIG. Is.

In the figure, L ₁ is the length of the detection resistor 9, and L ₃ is the inner length of the connection portion 17 and the connection portion 18. Here, the detection resistor 9 is located inside the connection portion 17 and the connection portion 18. That is, the region represented by L ₁ is inside the region represented by L ₃ . By adopting such a configuration, even in the second embodiment of the present invention, even if the mounting position of the detection resistor 9 varies as in the first embodiment of the present invention, a pair of detections are performed. Variations in voltage value and current value measured between the lines 5 and 6 are reduced.

In the second embodiment of the present invention, the connection portion 17 and the connection portion 18 are arranged inside, that is, the opposing surface is located outside the detection resistor 9. 12, L ₁ and L ₃ in FIG. 12 may be made to coincide with each other so that the opposing surface and the detection resistor 9 are in the same length position.

  The mounting board of the detection resistor according to the present invention can reduce the variation in resistance value even if there is a variation in the mounting position of the detection resistor, and is useful when applied to various electronic devices. is there.

The top view of the principal part of the mounting board of the resistor for detection in Embodiment 1 of this invention The top view of the principal part of the mounting substrate by which the detection resistor in Embodiment 1 of this invention was mounted The top view of the principal part of the mounting board of the resistor for detection in Embodiment 1 of this invention The top view of the principal part of the mounting board of the resistor for detection in Embodiment 1 of this invention The top view of the principal part of the mounting board of the resistor for detection in Embodiment 1 of this invention Plan view of main part of mounting board of detection resistor in comparative example Plan view of main part of mounting board of detection resistor in comparative example Plan view of main part of mounting board of detection resistor in comparative example The graph which shows the test result of the mounting board in FIGS. The graph which shows the test result of the mounting substrate in FIGS. Simple equivalent circuit diagram of the comparative example The top view of the principal part which shows the modification of the mounting substrate of the resistor for a detection in Embodiment 1 of this invention The top view of the principal part of the mounting board of the resistor for detection in Embodiment 2 of this invention The top view of the principal part of the mounting board by which the resistor for detection in Embodiment 2 of this invention was mounted

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 A pair of land 3, 4 A pair of power line 5, 6 A pair of detection line 7, 8 Notch 9 Detection resistor 17, 18 Connection part

Claims (4)

A pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor; and the pair of lands electrically connected to each other; and A pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands; and a pair of detection lines electrically connected to the pair of lands; and a connecting portion between the pair of lands and the pair of power lines A detection resistor mounting board in which notches are respectively formed in the vicinity from the opposing surface side of the pair of lands toward the outside. A pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor; and the pair of lands electrically connected to each other; and A pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, a pair of detection lines electrically connected to the pair of lands, and a pair of detection lines electrically connected to the pair of lands. And a notch formed in the vicinity of a connection portion between the pair of lands and the pair of power lines from the opposing surface side of the pair of lands to the outside. The detection resistor mounting board that extends to the same position as or outside of the resistor. A pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor; and the pair of lands electrically connected to each other; and A pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands, the pair of lands being connected to the pair of power lines and the pair The detection resistor mounting board extended so as to protrude to the opposite side of the pair of lands from the connecting portion to the lands. A pair of lands formed opposite to each other on the substrate for mounting the detection resistor and electrically connecting to the detection resistor; and the pair of lands electrically connected to each other; and A pair of power lines extending in a direction perpendicular to the opposing direction of the pair of lands, and a pair of detection lines electrically connected to the pair of lands, the pair of lands being connected to the pair of power lines and the pair The detection resistor is mounted so as to protrude from the connection portion with the land to the opposite side of the pair of lands, and the detection resistor is electrically connected to the extended portion. Mounting board.

Images