JPH08228479A - Substrate for composite circuit with built-in capacitor - Google Patents

Abstract

PURPOSE: To provide a substrate for a composite circuit with a built-in capacitor, which is miniaturized by positioning a rectifier in the storing hole provided in a dielectric substrate and besides in which the property of rectification output and the efficiency are improved by reducing the distribution capacity between both electrodes of the rectifier by this storing hole. CONSTITUTION: This is a substrate for a composite circuit with a built-in capacitor where capacitors C1 and C23 for an AC circuit made in a dielectric substrate 10 and capacitors C3, C4, C5, and C6 for a DC circuit are connected with each other by rectifiers D1, D2, and D3, and the rectifiers D1, D2, and D3 are stored in the storing hole 7 made in the dielectric substrate 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor-embedded composite circuit board such as a multiple voltage rectifier circuit and a Cockcroft-Walton circuit.

[0002]

2. Description of the Related Art Conventionally, when a Cockcroft-Walton circuit composed of a rectifier D and a capacitor C as shown in FIG. 9 is formed on a dielectric substrate, for example, as shown in FIG. In order to reduce the stray capacitance between the side electrode IN and the ground side electrode GND, the distance d between the input side electrode IN and the ground side electrode GND formed on the dielectric substrate 20 is increased.

Further, as shown in FIG. 7, a dielectric substrate 20 between the input side electrode IN of the rectifier D and the ground side electrode GND.
Were separated to form dielectric substrates 20a and 20b, respectively.

Further, as shown in FIG. 8, a dielectric substrate 2 between the input side electrode IN of the rectifier D and the ground side electrode GND.
At 0c, a void 21 having a width slightly smaller than the main body length of the rectifier D was formed.

[0005]

However, as shown in FIG. 6, in the conventional example in which the distance d between the input side electrode IN and the ground side electrode GND is increased, the mounting area of the rectifier D becomes large. However, there was a concern that stress would be applied between the terminals and the reliability would be reduced.

Further, as shown in FIG. 7, the input electrode IN
In the conventional example in which the dielectric substrate between the ground electrode and the ground-side electrode GND is separated, since two dielectric substrates 20a and 20b are used, there is a problem that the number of parts and the number of work steps increase.

Further, as shown in FIG. 8, a dielectric substrate 20 for the input side electrode IN of the rectifier D and the ground side electrode GND.
In the conventional example in which the void 21 is formed in c, the void 2
However, there is a problem in that the dielectric substrate 20c becomes large and the reliability of both terminals with respect to stress is reduced.

Therefore, according to the present invention, the rectifier is accommodated in the accommodating hole provided in the dielectric substrate for miniaturization, and the accommodating hole reduces the distributed capacitance between the two electrodes of the rectifier to obtain a rectified output. It is an object of the present invention to provide a capacitor-embedded composite circuit board having improved characteristics and efficiency.

[0009]

According to the present invention, in order to achieve the above object, a rectifier having a lead wire is housed in a housing hole having a bottomed hole or a through hole formed in a dielectric substrate. It is characterized in that it is connected to an AC circuit capacitor and a DC circuit capacitor formed on a dielectric substrate via lead wires.

[0010]

According to the present invention, since the rectifier housing hole is formed in the dielectric substrate, the rectifier can be easily positioned, the mounting height is reduced, and the size is reduced. At the same time, by forming the storage hole and removing the dielectric substrate, the stray capacitance between the rectifier terminals is reduced, and the characteristics and efficiency of the rectified output are improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of an embodiment of the present invention, in which the Cockcroft-Walton circuit shown in FIG. 5 is formed on a dielectric substrate. FIG. 2 is a sectional view taken along line XX of FIG. First, a Cockcroft-Walton circuit according to the embodiment will be described with reference to FIG. Rectifiers D1, D2 and D3 are connected in series between the input terminal IN and the output terminal OUT with the same polarity. Between the connection point j1 of the anode of the rectifier D1 and the input terminal IN and the connection point j3 of the rectifiers D2 and D3,
Two capacitors C1 and C2 are connected in series.
Also, a connection point j between the ground GND side and the rectifiers D1 and D2
Two capacitors C3 and C4 are connected in series between the two capacitors. Further, between the connection point j2 and the connection point j4 of the cathode of the rectifier D3 and the output terminal OUT, 2
The capacitors C5 and C6 are connected in series. The capacitors C1 and C2 form an AC capacitor, and the capacitors C3, C4, C5 and C6 form a DC capacitor. These two series capacitors C1 and C2, C3 and C4, C5 and C6 are
In this embodiment, two cocks are connected in series in order to integrally configure the Cockcroft-Walton circuit on the dielectric substrate, as will be described later.

Next, an embodiment of the present invention in which the Cockcroft-Walton circuit described above is constructed using a dielectric substrate will be described with reference to FIG. Reference numeral 10 is a dielectric substrate, and capacitor electrodes 1 and 2 are provided on one side and capacitor electrodes 3, 4, 5 and 6 are provided on the other side in the vicinity of both short sides of the surface of the dielectric substrate 10. The capacitor electrodes 4 and 5 form a common electrode. On the back surface of the dielectric substrate 10, there are provided a common electrode 12 facing the capacitor electrodes 1 and 2, a common electrode 34 facing the capacitor electrodes 3 and 4, and a common electrode 56 facing the capacitor electrodes 5 and 6, respectively. Has been.

In such a structure, the dielectric substrate 10
A capacitor C1 is formed by the capacitor electrode 1 on the front surface and the common electrode 12 on the back surface. Similarly, a capacitor C2 is formed by the capacitor electrode 2 and the common electrode 12,
The capacitor electrode 3 and the common electrode 34 form a capacitor C3.
Is formed. In addition, the capacitor electrode 4 and the common electrode 3
4 forms a capacitor C4, and the capacitor electrode 5
And the common electrode 56 form a capacitor C5. Then, the capacitor electrode 6 and the common electrode 56 form a capacitor C6. It should be noted that the capacitors C1 to C6 correspond to the capacitors having the same symbols shown in FIG.

In the central portion of the dielectric substrate 10, three storage holes 7 are provided. The sectional shape of the storage hole 7 is shown in FIG. 2 by taking the rectifier D1 as an example. The housing hole 7 has a U-shaped concave section, and has a depth and a playable width capable of housing about half of the rectifier D1 (similarly for D2 and D3). The rectifier D1 is in contact with the bottom surface of the storage hole 7.

One lead wire 7a of the rectifier D1 is connected to the capacitor electrode 1, and the other lead wire 7b is connected to the capacitor electrode 4. One lead wire 8a of the rectifier D2 is connected to the capacitor electrode 2, and the other lead wire 8b is connected to the capacitor electrode 5. Rectifier D3
One lead wire 9a is connected to the capacitor electrode 2,
The other lead wire 9b is connected to the capacitor electrode 6.

Next, the cross-sectional shape of another modified example of the storage hole will be shown in FIG. 3, taking the rectifier D1 as an example. The storage hole 8 has a recess having a semi-elliptical cross section, and the rectifier D1 (D2, D3
About the same) has a depth and playable width that can store about half of that. The rectifier D1 is in contact with the bottom surface of the storage hole 8.

A cross-sectional shape of still another modified example of the storage hole is shown in FIG. 4, taking the rectifier D1 as an example. The storage hole 9 has a through-hole in cross section, and has a playable width capable of storing the rectifier D1 (the same applies to D2 and D3). The rectifier D1 has lead wires 7a and 7b at both ends thereof.
About half of it is stored in the storage hole 9 in a hanging form.

[0018]

According to the present invention, since the rectifier housing hole is formed in the dielectric substrate, the rectifier can be easily positioned, the mounting height is reduced, and the size is reduced. At the same time, the stray capacitance between the terminals of the rectifier is reduced by providing the storage hole and removing the dielectric substrate, and the characteristics and efficiency of the rectified output are improved. At this time, if the storage hole is a bottomed hole, the rectifier is placed on the bottom surface of this bottomed hole, and if the storage hole is a through hole, the root of the rectifier is the storage hole due to the lead wires at both ends. Since it is supported by abutting against the edge of the rectifier, no stress is applied to the lead wire of the rectifier. Further, since the rectifier is housed in the housing hole, a straight lead wire can be used as the lead wire of the rectifier, and forming of the lead wire is unnecessary.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a composite circuit board with a built-in capacitor of the present invention.

FIG. 2 is a partial sectional view taken along line XX of FIG.

FIG. 3 is a partial cross-sectional view of another modified example of the storage hole shown in FIG.

FIG. 4 is a partial cross-sectional view of still another modified example of the storage hole shown in FIG.

FIG. 5 is a Cockcroft Walton circuit diagram according to the present embodiment.

FIG. 6 is a connection mode diagram of a rectifier to a dielectric substrate in a conventional example.

FIG. 7 is also a connection mode diagram of a rectifier to a dielectric substrate in another conventional example.

FIG. 8 is also a connection mode diagram of a rectifier to a dielectric substrate in another conventional example.

FIG. 9 is a Cockcroft Walton circuit diagram according to a conventional example.

[Explanation of symbols]

1, 2, 3, 4, 5, 6 Capacitor electrodes 7, 8, 9 Storage hole 10 Dielectric substrate 12, 34, 56 Common electrodes C1, C2, C3, C4, C5, C6 Capacitors D1, D2, D3 Rectifier

Claims (1)

[Claims] 1. A rectifier having a lead wire is housed in a housing hole having a bottomed hole or a through hole formed in a dielectric substrate, and an AC circuit capacitor formed in the dielectric substrate via the lead wire. A substrate for a composite circuit with a built-in capacitor that is connected to a capacitor for a DC circuit.