JP6128924B2 - High frequency noise countermeasure power supply circuit - Google Patents

Description

  The present invention relates to a high-frequency noise countermeasure power supply circuit in which a capacitor used for bypassing high-frequency noise is mounted on a power supply wiring of a device.

Capacitors play an important role as noise suppression components in electronic circuits. For example, a capacitor 2 is mounted between the power supply input and output positive and negative conductor wires (power supply wires) of the switching power supply device as shown in FIG. 8 in order to bypass high-frequency noise caused by the switching operation.
FIG. 8 is a circuit diagram of a portion where the capacitor 2 is connected between the conductor wiring (power supply wiring) 1a and 1b. When a capacitor fails for some reason, a conduction state, that is, a short mode failure may occur depending on the type of the capacitor. When a capacitor is placed between the power supply wiring lines to bypass high-frequency noise, if this capacitor fails in the short mode, the power supply wiring may be short-circuited, and the equipment connected to this power supply wiring may stop or fail. There is.

  In order to reduce this possibility, two capacitors are connected in series as shown in FIG. 9, FIG. 10, FIG. 11, and FIG. FIG. 9 is a circuit diagram of a portion in which capacitors 2a and 2b are connected in series via conductor wiring 1c between conductor wirings 1a and 1b. 10, 11 and 12 are plan views showing a state in which two capacitors 2a and 2b are connected in series between the conductor wirings 1a and 1b via the conductor wiring 1c on the insulating substrate 6. FIG. In this configuration, the probability that two capacitors connected in series fail simultaneously is very small. Therefore, it is possible to reduce the possibility of short-circuiting between the conductor wirings 1a and 1b due to a short mode failure of the capacitor.

Japanese Patent Laying-Open No. 2004-241506 (Patent Document 1) describes a configuration in which two capacitors are connected in series for the purpose of preventing a short-circuit between lines when a capacitor is arranged for high-frequency noise bypass between power lines. It is shown.
When connecting capacitors in series, for example, the ESL (equivalent series inductance, usually 0.5nH to 1nH) of a surface-mount type capacitor, and the inductance of the wiring connecting the capacitors (length is about 1nH at 1mm length) Only the number is added. For example, when two surface-mount capacitors are connected in series with a 5 mm long wire, the total effective inductance is about 6 nH, which is about 10 times higher than that of a single capacitor. Thus, when a plurality of capacitors are connected in series, the effective inductance is increased, and the bypass effect of high frequency noise is reduced.

On the other hand, in Japanese Patent Application Laid-Open No. 2011-014788 (Patent Document 2), a capacitor assembly is formed by arranging two capacitor assembly units each having a plurality of capacitors arranged in parallel so that currents in opposite directions flow. A configuration aimed at reducing the effective inductance of the entire device by mutual inductance between units is shown.
As described above, when a plurality of capacitors are connected in series for the purpose of preventing a short circuit between the wires, the capacitors 2a and 2b are arranged between the conductor wirings 1a and 1b so that currents in opposite directions flow as shown in FIG. Thus, a configuration for reducing the effective inductance of the capacitor can be obtained.

JP 2004-241506 A (vehicle wiring board) JP 2011-014788 (capacitor device)

When two or more capacitors are connected in series between power supply lines in order to prevent a short circuit between lines due to a short mode failure of the capacitor, the effective inductance increases by the number of capacitors and the bypass effect of high frequency noise decreases. Therefore, as shown in FIG. 12, by arranging capacitors connected in series so that currents in opposite directions flow, a configuration in which effective inductance is reduced by mutual inductance between capacitors can be obtained.
However, in order to arrange the capacitors between the power supply wires as described above, the distance between the power supply wires must be increased. As a result, the capacitive coupling between the power supply lines is reduced, the high frequency noise bypass effect is reduced, and the current loop area is increased to increase the leakage of electromagnetic noise and be affected by external noise. There was a problem that it became easier.
Furthermore, in order to arrange the capacitors between the power supply wires as described above, the wires for connecting the power supply wires to the capacitors must be extended. Therefore, there is a problem that the bypass effect of the high frequency noise is lowered due to the inductance of the extended wiring.

  The present invention is for solving the above-described problems. In order to enhance the high-frequency bypass effect, two capacitors or two capacitors are disposed between power supply wirings arranged and formed in close proximity and in pairs on an insulating substrate. Multiple units are arranged in a U-shape on an insulating substrate and connected in series. In addition, the proximity structure between these power supply wires is maintained, and the capacitor connection wires are shortened to reduce the inductance of the capacitor connection wires. The purpose is to do.

The power supply circuit for high frequency noise countermeasure according to the present invention is:
First and second conductor wirings that are formed in a plate shape and wide by a conductive material disposed in parallel in a pair on one surface of the insulating substrate, and
A space part that is notched in a concave shape so as to face each other in the middle part of the first and second conductor wirings,
The first capacitor has a first capacitor, a second capacitor, and a third conductor wiring, and the first capacitor has a start terminal connected to the first conductor wiring and a termination terminal connected to the third conductor wiring. The second capacitor has a start terminal connected to the second conductor wiring, a terminal terminal connected to the third conductor wiring, and the direction of the current flowing through the first capacitor is connected to the conductor wiring. The first capacitor and the third capacitor are arranged in parallel so that the first capacitor and the second capacitor are arranged to be opposite to each other by 180 ° with respect to the direction of the current flowing through the second capacitor. Conductor wiring, comprising a series capacitor circuit in which the path by the second capacitor is arranged in a U-shaped configuration,
The series capacitor circuit is configured to disposed within the space.

According to the high frequency noise countermeasure power supply circuit of the present invention,
It is arranged in pairs on the surface of the insulating substrate, forms a concave part facing each other in the middle part of the adjacent conductor wiring, forms a space part, divides a plurality of capacitors into two, and is divided into two The same number of capacitors are arranged so that the same terminals face the same direction, and each is connected in series, and the start terminal of the series-connected capacitor row divided into two is connected to the first and second conductor wirings, respectively. Since the terminal terminals are connected by the third conductor wiring, and the series capacitor circuit having a U-shaped configuration is arranged in the space portion, the same number of capacitors has a current in the reverse direction. It is possible to mount the conductor wiring and the capacitor with a short wiring length with a flowing series connection configuration. In addition, the conductor wiring that is the power supply wiring can be made close to each other, and the configuration can be realized to enhance the high frequency bypass effect in which a plurality of capacitors are connected in series.

It is a top view of the power circuit for high frequency noise countermeasures which shows Embodiment 1 of this invention. It is a top view of the high frequency noise countermeasure power supply circuit which shows the other Example of Embodiment 1 of this invention. It is a top view of the high frequency noise countermeasure power supply circuit which shows Embodiment 2 of this invention. It is a top view of the high frequency noise countermeasure power supply circuit which shows Embodiment 3 of this invention. It is a top view of the high frequency noise countermeasure power supply circuit which shows Embodiment 4 of this invention. It is a bottom view of the high frequency noise countermeasure power supply circuit which shows Embodiment 4 of this invention. FIG. 7 is a YY ′ cross-sectional view in FIG. 5 or FIG. 6. FIG. 6 is a circuit diagram of a portion where one capacitor is connected between conventional power supply wirings. It is a circuit diagram of the part which connected two capacitors in series between the conventional power supply wiring. FIG. 6 is a plan view in which two capacitors are connected in series so as to be orthogonal to a power supply wiring between conventional power supply wirings. FIG. 6 is a plan view in which two capacitors are connected in series so as to be parallel to a power supply line between conventional power supply lines. FIG. 6 is a plan view in which two capacitors are connected in series between conventional power supply wirings and the capacitors are arranged in a U-shape.

Embodiment 1 FIG.
A high frequency noise countermeasure power supply circuit according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a plan view of a high frequency noise countermeasure power supply circuit according to Embodiment 1 of the present invention as viewed from above. In the figure, reference numerals 1a and 1b denote first and second conductor wirings formed on the insulating substrate 6 to form power supply wirings. Reference numeral 1c denotes a third conductor wiring formed on the insulating substrate 6, reference numerals 2a and 2b denote two capacitors, and reference numeral 3 denotes a space provided between the first and second conductor wirings 1a and 1b.
In the first embodiment shown in FIG. 1, two capacitors 2a and 2b are arranged in the space portion 3 with respect to the first and second conductor wirings 1a and 1b that are arranged in parallel on the insulating substrate 6 in parallel. And a structure in which the first and second conductor wirings 1a and 1b are connected in series with each other.
The first and second conductor wirings 1a and 1b are in close proximity to each other on one surface of the insulating substrate 6, and are formed in a plate shape and wide by a conductive material arranged in parallel. The space part 3 is formed by being cut out in a concave shape so as to face each other at the intermediate part.
The third conductor wiring 1c is disposed in the space 3, and connects the terminals on the opposite side of the terminals connected to the first and second conductor wirings 1a and 1b of the two capacitors 2a and 2b. A series capacitor circuit is formed so that the two capacitors 2a and 2b are arranged in a U shape.
Needless to say, the space portion 3 in which the middle of the first and second conductor wirings 1a and 1b is cut out in a concave shape is electrically connected to the first and second conductor wirings 1a and 1b and the third conductor wiring 1c. The space is formed in such a size as to allow a distance to be electrically insulated.

  Capacitors 2a and 2b in the figure are surface-mount type capacitors, and one terminal of the capacitor 2a is connected to the first conductor wiring 1a and the other terminal is connected to the third conductor wiring 1c. One terminal of the capacitor 2b is connected to the second conductor wiring 1b, and the other terminal is connected to the third conductor wiring 1c.

  As described above, in the first embodiment, the path from the first conductor wiring 1a to the capacitor 2a, the third conductor wiring 1c, the capacitor 2b, and the second conductor wiring 1b is arranged in a U-shape, and the capacitor 2a The terminal connected to the first conductor wiring 1a and the same terminal as the capacitor 2a connected to the second conductor wiring 1b of the capacitor 2b are in the same direction, that is, the direction of the current flowing through the capacitor 2a is the current flowing through the capacitor 2b. The capacitor has a structure of a series capacitor circuit in which the capacitors 2a and 2b are arranged in parallel so as to be opposite to the direction by 180 °.

  Next, the effect | action by Embodiment 1 of this invention is demonstrated. Capacitors 2a and 2b and the conductor wiring connected to each capacitor, the first conductor wiring 1a to the second conductor wiring 1b, or the second conductor wiring 1b to the first conductor wiring 1a, the capacitor 2a and Consider the case where a noise current flows through 2b. In the structure of the first embodiment, the capacitor is arranged in a U-shape (parallel) so that the direction of the current flowing through the capacitor 2a is 180 ° opposite to the direction of the current flowing through the capacitor 2b. The magnetic flux generated by the current flowing through the capacitor cancels out. That is, the effective inductance of each capacitor is reduced by the mutual inductance acting between the capacitors, and the capacitor 2a is connected from the first conductor wiring 1a to the second conductor wiring 1b or from the second conductor wiring 1b to the first conductor wiring 1a. Since the effective inductance when the noise current flows through 2b is reduced, a high frequency noise bypass effect can be obtained as compared with the case where the capacitors are arranged linearly.

In addition, a space 3 is formed as a concave cutout shape in which an intermediate portion between the first conductor wiring 1a and the second conductor wiring 1b is opposed to each other, and a series capacitor circuit is arranged in the space 3 so that the parallel portions Compared to the case where a series capacitor circuit is mounted between conductor wirings that do not have a concave notch shape, the wiring length between the capacitor 2a and the first conductor wiring 1a, and between the capacitor 2b and the second conductor wiring 1b is It becomes possible to mount it short, and it is possible to mount between the first conductor wiring 1a and the second conductor wiring 1b while maintaining the adjacent structure with the U-shaped arrangement of the capacitor. Become.
Therefore, according to the first embodiment, a configuration in which two or a plurality of capacitors are connected in series by arranging in parallel in the U-shape between adjacent conductor wires arranged in pairs, and between the conductor wires and the capacitors. It is possible to mount with a shorter wiring length. Accordingly, it is possible to realize a configuration in which a series capacitor circuit configuration in which capacitors are connected in series is arranged in a U-shape in order to enhance the high frequency bypass effect while maintaining the proximity structure between the power supply wirings.

  In the first embodiment, the capacitors 2a and 2b are arranged to face each other, but the terminal connected to the first conductor wiring 1a of the capacitor 2a and the terminal connected to the conductor wiring 1b of the capacitor 2b are the same. If the structure is oriented in the direction, it includes a configuration in which the first conductor wiring 1a is extended and connected to the capacitor 2a, or the second conductor wiring 1b is extended and connected to the capacitor 2b.

  In the first embodiment, the capacitors 2a and 2b are surface mount type capacitors. However, a terminal connected to the first conductor wiring 1a of the capacitor 2a and a terminal connected to the second conductor wiring 1b of the capacitor 2b. If the structure is oriented in the same direction, a configuration using a lead type capacitor is also included.

  In the first embodiment, the terminal connected to the first conductor wiring 1a of the capacitor 2a and the terminal connected to the second conductor wiring 1b of the capacitor 2b are in the same direction, that is, the direction of the current flowing through the capacitor 2a. The structure is 180 ° opposite to the direction of the current flowing through the capacitor 2b. However, if the magnetic field generated by the current flowing through each opposing capacitor is within the range that cancels well, the angle at which the capacitor is placed The structure which changes is also included.

In the first embodiment, a structure in which two capacitors are connected in series between the first conductor wiring 1a and the second conductor wiring 1b is shown. In this case, increase one by one and divide the capacitors into two. The same number of capacitors divided into two are arranged so that the same terminal faces the same direction, and each is connected in series. The starting end terminals of the divided series-connected capacitor rows are connected to the first and second conductor wires, respectively, and the terminal terminals are connected to each other by a third conductor wire to form a U-shaped series capacitor circuit. A configuration may be adopted in which it is arranged in the space 3.
Further, the first embodiment includes a structure in which the third conductor wiring 1c is linearly arranged so as to connect the capacitors 2a and 2b with the shortest distance as shown in FIG.

Embodiment 2. FIG.
A high frequency noise countermeasure power supply circuit according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a plan view of the second embodiment of the present invention as viewed from above. In the figure, 1a, 1b, and 1c are first, second, and third conductor wirings, 1e and 1f are first and second conductor wiring extensions, 2a and 2b are capacitors, and 3 is first and second wirings. This is a space between the conductor wirings 1a and 1b.
FIG. 3 shows that the narrowed portions of the concave notches of the first conductor wiring 1a and the second conductor wiring 1b in Embodiment 1 are approximately the same as the notch width outwardly with respect to the space portion 3. The structure is shown as expanded portions 1e and 1f. The description of the other parts is the same as that in Embodiment 1, and will be omitted.
As described above, in the second embodiment, the first and second conductor wirings 1a and 1b have the extended portions 1e and 1f as compared with the first embodiment.

Next, the operation of the present invention according to the second embodiment will be described. The first conductor wiring 1a and the second conductor wiring 1b are adjacent to the space portion 3 by widening the first conductor wiring 1a and the second conductor wiring 1b outward with respect to the space portion 3. Since the resistance value can be lowered, an effect of increasing the withstand current amount can be obtained. Therefore, according to the second embodiment, in addition to the function of the first embodiment, a structure that increases the withstand current amount can be obtained.
In the second embodiment, the extended portions 1e and 1f of the first conductor wiring 1a and the second conductor wiring 1b have a structure that widens outward, but the extended portion has the first conductor wiring 1a and the second conductor wiring 1a. It also includes a structure that increases the thickness of the notched portion of the conductor wiring 1b. In other words, by increasing the volume of the conductor in the notched portion of the first conductor wiring 1a and the second conductor wiring 1b to the same volume as the other portions having the same length as the notched portion, the current resistance can be increased. Can do.
In the second embodiment, the extended portions 1e and 1f of the first conductor wiring 1a and the second conductor wiring 1b are rectangular. However, the extended portions 1e and 1f are longer and other shapes are also possible. Shall be included.

Embodiment 3 FIG.
A high-frequency noise countermeasure power supply circuit according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a plan view of the third embodiment of the present invention as viewed from above. In the figure, 1a, 1b and 1c are first, second and third conductor wirings, 2a and 2b are capacitors, 3 is a space between the first and second conductor wirings 1a and 1b, and 4a and 4b are respectively This is a cut-shaped portion formed in the first conductor wiring 1a and the second conductor wiring 1b. The notched portions 4a and 4b are the connection portions of the capacitors 2a and 2b of the first conductor wiring 1a and the second conductor wiring 1b, respectively, and from the outside with respect to the first conductor wiring 1a and the second conductor wiring 1b. The structure has a triangular incision shape facing inward. The description of the other parts is the same as that in Embodiment 1, and will be omitted.
As described above, the third embodiment is different from the first embodiment in that the first conductor wiring 1a and the second conductor wiring 1b are cut at the connection portions of the capacitors 2a and 2b. have.

Next, the operation of the high frequency noise countermeasure power supply circuit according to the third embodiment will be described. For the first conductor wiring 1a and the second conductor wiring 1b, the first conductor wiring 1a and the second conductor wiring are formed by forming the cut-shaped portions 4a and 4b at the connection portion between the capacitors 2a and 2b. Since the path of the noise current flowing through 1b can be narrowed to the vicinity of the capacitor terminal, the noise current can easily pass through the capacitor, and the bypass effect of high-frequency noise is enhanced as compared with the case where there is no cut shape.
Therefore, the third embodiment provides a structure that enhances the bypass effect of high frequency noise in addition to the function of the first embodiment.

  In the third embodiment, the first conductor wiring 1a and the second conductor wiring 1b are connected to the capacitors 2a and 2b to form inwardly triangular cut-in shape portions 4a and 4b. If the current path can be narrowed down to the connection portion with the capacitor by forming the cut shape portion in the first conductor wiring 1a and the second conductor wiring 1b, the cut shape includes other than the triangle.

Embodiment 4 FIG.
A high frequency noise countermeasure power supply circuit according to the fourth embodiment of the present invention will be described with reference to FIGS. 5, 6, and 7. FIG. 5 is a view of the fourth embodiment of the present invention viewed from the surface of the first conductor wiring 1a, FIG. 6 is a view of the second conductor wiring 1b, and FIG. It is YY 'sectional drawing of FIG. In the figure, 1a, 1b, 1c and 1d are first, second, third and fourth conductor wirings, 2a and 2b are capacitors, and 3a is a first conductor wiring 1a near one end of the first conductor wiring 1a. Is a space part 3b is hollowed out to a predetermined area, 3b is a space part in which the second conductor wiring 1b is hollowed out to a second conductor wiring 1b close to the same end as the space part 3a, 5b Is a through hole, and 6 is an insulating substrate.

5 to 7 are formed by being cut out by the wide first conductor wiring 1a and the second conductor wiring 1b which are arranged to face each other with the insulating layer of the insulating substrate 6 sandwiched between the top and bottom (front and back). Capacitors 2a and 2b are disposed in the respective space portions 3a and 3b, and the capacitors 2a and 2b are connected in series by the third and fourth conductor wires 1c and 1d between the first and second conductor wires 1a and 1b. The connected structure is shown.
The space 3a provided in the first conductor wiring 1a has the first conductor wiring 1a sized so as to have a distance that allows the first conductor wiring 1a and the third conductor wiring 1c to be electrically insulated. It has a hollow shape. The space 3b provided in the second conductor wiring 1b has a hollowed shape of the first conductor wiring 1a, that is, a shape facing the space 3a.

Capacitors 2a and 2b in the figure are surface mount type capacitors, and one terminal of the capacitor 2a is connected to the first conductor wiring 1a and the other is connected to the third conductor wiring 1c. One terminal of the capacitor 2b is connected to the second conductor wiring 1b, and the other terminal is connected to the fourth conductor wiring 1d. The through hole 5 penetrates through the insulating layer of the insulating substrate 6 and connects the third and fourth conductor wirings 1c and 1d.
As described above, in the fourth embodiment, the path from the first conductor wiring 1a to the capacitor 2a, the third conductor wiring 1c, the through hole 5, the fourth conductor wiring 1b, the capacitor 2b, and the second conductor wiring 1d is described. The terminal connected to the first conductor wiring 1a of the capacitor 2a and the terminal connected to the second conductor wiring 1b of the capacitor 2b are arranged in the same direction, that is, the direction of the current flowing through the capacitor 2a. The capacitor has a series capacitor circuit structure in which the capacitors 2a and 2b are arranged to face each other so that the direction of current flowing through the capacitor 2b is 180 ° opposite.

  Next, the operation of the fourth embodiment of the present invention will be described. Capacitors 2a and 2b and capacitors 2a and 2b from the first conductor wiring 1a to the second conductor wiring 1b or from the second conductor wiring 1b to the first conductor wiring 1a with respect to the conductor wiring connected to each capacitor Consider the case where a noise current flows through In the structure according to the fourth embodiment of the present invention, the capacitor is mounted so that the direction of the current flowing through the capacitor 2a is 180 ° opposite to the direction of the current flowing through the capacitor 2b. The magnetic flux to cancel out. That is, the effective inductance of each capacitor is reduced by the mutual inductance between the capacitors, and the capacitors 2a and 2b are transferred from the first conductor wiring 1a to the second conductor wiring 1b or from the second conductor wiring 1b to the first conductor wiring 1a. Since the inductance when the noise current flows through is reduced, a high frequency noise bypass effect can be obtained as compared with the case where the capacitors are arranged linearly.

In addition, by arranging capacitors on opposite sides of the cutout portions 3a and 3b of the first conductor wiring 1a and the second conductor wiring 1b, that is, the insulating layer of the insulating substrate 6, between the conductor wiring and the capacitor. It is possible to mount with a shorter wiring length.
Therefore, according to the fourth embodiment, when two or more capacitors are connected in series between power supply wires (conductor wires) arranged opposite to each other with the insulator layer of the insulating substrate 6 interposed therebetween, the capacitors are respectively connected to the space portion 3a, By placing the capacitor in 3b and arranging the capacitor series circuit in a U shape, it is possible to reduce the wiring length between the conductor wiring and the capacitor, and between the power supply wiring (first and second conductor wiring) The structure for enhancing the high frequency bypass effect by connecting capacitors in series can be realized while maintaining the proximity structure.

In the fourth embodiment, the terminal connected to the first conductor wiring 1a of the capacitor 2a and the terminal connected to the conductor wiring 1b of the capacitor 2b are in the same direction, that is, the direction of the current flowing through the capacitor 2a is the same as that of the capacitor 2b. Although a structure that is 180 ° opposite to the direction of the flowing current is shown, a structure that changes the angle is also included as long as the magnetic field generated by the current flowing through the opposing capacitor is within a range that can be satisfactorily canceled.
In the fourth embodiment, the first conductor wiring 1a and the second conductor wiring 1b have the same width. However, if the space 3b has a hollow shape facing the space 3a, A configuration in which the width is different or at least one of the conductor wirings is a solid conductor is also included.

  The power circuit for countermeasures against high-frequency noise according to the present invention can be used for, for example, a vehicle wiring board equipped with various electric actuators used in automobiles and a control device for displaying various information about automobiles on a liquid crystal panel or the like. There is sex.

1a: 1st conductor wiring, 1b: 2nd conductor wiring, 1c: 3rd conductor wiring, 1d: 4th conductor wiring, 1e, 1f: Extension part, 2, 2a, 2b: Capacitor, 3, 3a , 3b: space part, 4a, 4b: notch shape part, 5: through hole, 6: insulating substrate.

Claims (4)

First and second conductor wirings that are formed in a plate shape and wide by a conductive material disposed in parallel in a pair on one surface of the insulating substrate, and
A space part that is notched in a concave shape so as to face each other in the middle part of the first and second conductor wirings,
The first capacitor has a first capacitor, a second capacitor, and a third conductor wiring, and the first capacitor has a start terminal connected to the first conductor wiring and a termination terminal connected to the third conductor wiring. The second capacitor has a start terminal connected to the second conductor wiring, a terminal terminal connected to the third conductor wiring, and the direction of the current flowing through the first capacitor is connected to the conductor wiring. The first capacitor and the third capacitor are arranged in parallel so that the first capacitor and the second capacitor are arranged to be opposite to each other by 180 ° with respect to the direction of the current flowing through the second capacitor. Conductor wiring, comprising a series capacitor circuit in which the path by the second capacitor is arranged in a U-shaped configuration,
High frequency noise countermeasure power circuit the series capacitor circuit is characterized by comprising disposed within said space. With respect to the concavely cut portions of the first and second conductor wirings , outwardly with respect to the space portion so as to have the same volume as other portions having the same length as the cutout portions. The high frequency noise countermeasure power supply circuit according to claim 1, further comprising an extension portion.   2. The high frequency noise according to claim 1, wherein a cut shape portion is formed from the outside toward the inside in a portion of the first and second conductor wires where both the conductor wires and the capacitor row are connected. Power supply circuit for countermeasures. First and second conductor wirings formed in a wide plate-like shape arranged in parallel by conductive materials on the front and back surfaces of the insulating substrate, respectively,
A space where the conductor wiring is cut out to a predetermined area near one end of each of the first and second conductor wirings,
A plurality of capacitors provided in the space portion of the first and second conductor wirings on both the front and back surfaces, and connected to the first and second conductor wirings so that the same terminal faces the same direction, and
A third conductor wiring that is provided in the space of the first and second conductor wirings on both the front and back surfaces, is connected to the other end of each capacitor, and is electrically connected to both front and back surfaces by through holes that penetrate the front and back surfaces of the insulating substrate. A power supply circuit for high frequency noise countermeasures.

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