JPS6246262Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a new flat electrolytic capacitor, in particular, it is provided with an input terminal and an output terminal so that the electrolytic capacitor can be used as one electronic circuit such as a filter circuit, and the input terminal and the output terminal are provided. The present invention aims to provide a novel flat electrolytic capacitor that is shielded from the output side so that noise entering the input side does not affect the output side.

Reducing noise is the most important thing in a pulse power supply. Regarding this,
One pulse power supply device will be explained in detail as an example. FIG. 1 is a circuit diagram showing an example of a pulse power supply device. In the figure, T1 and T2 are input terminals into which direct current obtained by rectifying a commercial alternating current is input, and T1 is on the plus side and T2 is on the minus side. F1 is a filter to remove noise and ripple, and capacitor C1 and chiyoke coil
CHa, capacitor C2 and electrolytic capacitor CC1
Consisting of TL is a transformer, Q is a switching transistor, and a direct current supplied from the outside through an input terminal T1 flows to the transistor Q via one coil L1 of the choke coil CHa constituting the filter F1 and the primary coil L3 of the transformer TL. The pulse current passing through the transistor Q passes through the resistor R1, further passes through the other coil L2 of the choke coil CHa, and flows out from the input terminal T2. R2 and C4 are a resistor and a capacitor connected in series, and this series circuit is connected in parallel to the primary coil L1 of the transformer TL. R3 and C
3 is a resistor and a capacitor connected in parallel with each other,
A diode Da is connected in series to this parallel circuit, and this circuit consisting of R3, C3 and Da is also connected in parallel to the primary coil L3.

One end of the secondary coil L4 of the transformer TL is connected to the anode of the diode D1, and the other end is connected to the output reference terminal T3. Diode D1
The cathode of is connected to a multistage filter F2. Multi-stage filter F2 is a chiyoke coil CH
1. CH2 and electrolytic capacitor CC2, CC3, CC
Consists of 4. Thus, the pulse current passing through the diode D1 is smoothed by the multistage filter F2, noise and ripples are further removed, and the pulse current is outputted to the outside as a direct current through the output positive terminal T4. A positive DC voltage is thus obtained between terminals T4 and T3. Note that illustration and explanation of the circuit that generates the switching signal SS will be omitted.

Such a pulse power supply circuit is mounted in case a as shown in Fig. 2, and direct current is supplied to the circuit, and direct current is taken out from the circuit through a hole provided on one side edge of case 2. This is done through lead wires c, c', . . . drawn out from b, b'.

By the way, in such a pulse power supply device, the pulse noise generated internally is transmitted through the lead wires c,
c',..., and as a result, it was not possible to prevent noise from being added to the output DC current. Of course, it was possible to reduce the noise and ripple to some extent by increasing the number of stages of the filter, especially the multi-stage filter F2, but even if this was done, the holes b,
b' It was extremely difficult to obtain a clean output current because noise entered the vicinity of the hole b' where the lead wires c' and c' through which the output DC current flows were passed. Also, as mentioned above, by increasing the number of stages in the multistage filter F2, the noise added to the output DC current can be somewhat reduced, but in that case, the number of electrolytic capacitors and choke coils that make up the filter will naturally increase. ,and,
Since electrolytic capacitors and chiyoke coils are expensive, problems arise in that the cost of the device increases and the device becomes larger.

Therefore, the present invention provides a flat electrolytic capacitor with an input terminal and an output terminal so that it can be used as one electronic circuit, such as a filter circuit, and also shields the input side and output side. The purpose of this technology is to prevent the noise that has entered the input side from flowing out to the output side, thereby obtaining a low-noise electronic circuit device. A laminate formed by stacking the two layers is housed in a case made of a shielding material, a plurality of input terminals connected to the anode foil and the cathode foil are provided on one main surface of the case, and the other main surface of the case is provided with a plurality of input terminals connected to the anode foil and the cathode foil. A plurality of output terminals connected to the anode foil and the cathode foil are provided.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments of flat electrolytic capacitors shown in the accompanying drawings.

3 to 8 show an example of the implementation of the flat electrolytic capacitor of the present invention. FIG. 3 is an exploded perspective view of the laminate 1 forming the element of the flat electrolytic capacitor, and FIG. 4 is an exploded perspective view. FIG. 2 is a plan view of the laminate 1. FIG. The laminate 1 is formed by stacking anode foils 2 and cathode foils 3 alternately with electrolytic paper 4 interposed therebetween, and is formed into a rectangular body elongated in the left-right direction in FIGS. 3 and 4. For convenience, the superimposed anode foil and cathode foil include 2a, 3a, 2b, 3b, 2c,
Give the sign of 3c. Electrolytic paper 4, 4,
...The lug pieces 5a, 5a, 5b, 5b, 5c, 5c extending from above to the left and right in the figure are integrally formed, and the fourth lug pieces on both end surfaces of the cathode foils 3a, 3b, 3c are integrally formed.
At the bottom of the figure are tabs 6a, 6a, 6b, 6b, 6 extending from the electrolytic paper 4, 4, . . . to the left and right.
c and 6c are integrally formed.

The laminate 1 shown in FIGS. 3 and 4 is housed in a case 7 made of a conductive metal such as aluminum as shown in FIG. 5. As shown in FIG. 8 is an input side anode terminal, and 9 is an input side cathode terminal, which are electrically insulated from the case 7 by insulating spacers 10, 10, and penetrate into the case 7 from one main surface side. It is provided. 11 is an output side anode terminal, and 12 is an output side cathode terminal, which are electrically insulated from the case 7 by insulating spacers 10, 10, and connected to the other main surface side of the case 7, that is, the input side 2. It is provided so as to penetrate into the case 7 from the main surface opposite to the main surface on which the two terminals 8 and 9 are provided.

6 and 7 show the internal structure of a flat electrolytic capacitor. Anode foil 2a, 2b, 2c
The lug pieces 5a, 5b, 5c on one side are connected to each other, and the lug pieces 5a, 5c on the other side are connected to each other.
b and 5c are also connected to each other. 13,
13 are ear pieces 5a, 5b, 5c and 5a, 5b, 5
With the current collector plate connected to c, the ear pieces 5a, 5
b, 5c and 5a, 5b, 5c are connected to one end of conductive plates 14, 14 via their current collecting plates 13, 13. The other end of one of the conductive plates 14, 14 is connected to the input anode terminal 8, and the other end of the other 14 is connected to the output anode terminal 11.
is connected to. The connection between the conductive plates 14, 14 and the anode terminals 8, 11 will be explained in detail later.

Also, the lug pieces 6a, 6b, 6c on one side of the cathode foils 3a, 3b, 3c are connected to each other, and the lug pieces 6a, 6b, 6c on the other side are connected to each other. 15, 15 are ear pieces 6a, 6
b, 6c and a current collecting plate connected to 6a, 6b, 6c;
b, 6c are connected to one end portion of the conductive plates 16, 16 via the current collector plates 15, 15. The other end of one of the conductive plates 16, 16 is connected to the input cathode terminal 9, and the other end of the other conductive plate 16 is connected to the output cathode terminal 12.

Conductive plates 14, 14 and 16, 16 and each terminal 8,
Connections with 9, 11, and 12 are made as follows. Terminal mounting holes 18 and 19 are provided at an appropriate distance from each other on the left side of the lid 17 of the case 7 in FIG. 6 (right side in FIG. Terminal mounting holes 21 and 22 are provided at an appropriate distance from each other on the right side in the figure. Each terminal mounting hole 18, 19,
Sleeve-shaped insulating spacers 10, 10, 10, 10 are inserted into 21 and 22, respectively. Then, the left tabs 5a, 5b, 5c of the anode foils 2a, 2b, 2c in FIG. 6 and the current collector plate 13.
The input side anode terminal 8 is passed through the distal end of the conductive plate 14 connected via the conductive plate 14 , and its head is connected to the conductive plate 14 . The input side anode terminal 8 further passes through the metal disk 23 and through the insulating spacer 10 so that the tip thereof protrudes from the surface of the lid 17 of the case 7. A metal disk 23 is externally connected to the root of the portion protruding from the surface of the case lid 17. In this way, the input anode terminal 8 is attached to the lid 17 of the case 8 while being insulated therefrom and connected to the conductive plate 14. Connections between the input side cathode terminal 9, the output side anode terminal 11, and the output side cathode terminal 12 and the conductive plates 16, 14, and 16 are made in the same manner.

Then, the fitting protrusion 25 formed integrally on the lower end surface of the peripheral edge of the lid body 17 is fitted into the fitting groove 24 formed on the upper end surface of the peripheral edge of the dish-shaped case body 20, and the case body 20 and the lid body are fitted together. 17 at their peripheries by means such as welding. With this, the anode foils 2a, 2b, 2c and the cathode foil 3
A, 3b, 3c are laminated with electrolytic papers 4, 4, 4, . . . interposed therebetween, and a capacitor C shown in FIG. The anode of the capacitor C is connected to the input anode terminal 8 and the output anode terminal 11, and the cathode is connected to the input cathode terminal 9 and the output cathode terminal 12. This capacitor C has anode foil 2
Countless micro capacitors C1, C2, C distributed in the portion from the left end to the right end in FIG. 6 of the cathode foils 3a, 3b, 3c.
It can be said that it consists of 3, C4...C∞. Also, since inductance remains in that part, countless minute coils La1, La2, La3, ...La∞ and Lb
1, Lb2, Lb3, ...Lb∞ can be considered to be distributed. Therefore, a distributed constant circuit as shown in FIG. 9 is formed between the input anode terminal 8 and input cathode terminal 9 and the output anode terminal 11 and output cathode terminal 12 of this flat electrolytic capacitor. Ru. As is clear from this figure, this circuit consists of minute coils La1, La2,...La∞, Lb1, Lb2...Lb
∞ and minute capacitors C1, C2, .

This flat electrolytic capacitor has two terminals 8, 9 on the input side and two terminals 11, 11 on the output side.
2 and 12 are formed on the opposite main surfaces of the case 7, and by making the case 7 function as an electrostatic shield, noise from the outside is transferred to the multistage filter circuit inside the case 7. This can be prevented. Therefore, this flat electrolytic capacitor is most suitable as a filter for a pulse power supply device.

FIG. 10 is a circuit diagram of one case in which the flat electrolytic capacitor described above is used as a filter in a pulse power supply device. In this circuit, the transformer TL
The filter section of the first stage on the secondary side uses a chiyoke coil CH1 and an ordinary electrolytic capacitor CC2, and the filter section of the subsequent stage is composed of a flat electrolytic capacitor.

The above-mentioned flat electrolytic capacitor has an input electrode terminal and an output electrode terminal connected to a laminate that forms a capacitor element, so there is a capacitance distributed in the laminate and a residual amount between the input electrode terminal and the output electrode terminal. A filter circuit consisting of a distributed constant circuit is formed by the inductance. Therefore, such a flat electrolytic capacitor functions as a filter. Therefore, a high-performance multi-stage filter can be obtained without providing a large number of chiyoke coils and capacitors, and the price of the filter can be significantly reduced. Since the laminate is electrostatically shielded from the outside by the case by, for example, grounding the case, direct intrusion of noise into the laminate can be prevented. In addition, since the input electrode terminal and the output electrode terminal are provided on the main surface of the case on opposite sides, the case blocks the space between the input electrode terminal and the output electrode terminal, and noise that enters the input electrode terminal can be prevented. can be prevented from affecting the output side, and output noise can be reduced.

As described above, in the flat electrolytic capacitor of the present invention, a laminate formed by stacking multiple pairs of anode foils and cathode foils facing each other with electrolytic paper interposed therebetween is housed in a case made of a shielding material, and the laminate is housed in a case made of a shielding material. A plurality of input terminals connected to the anode foil and the cathode foil are provided on one main surface of the case, and a plurality of output terminals connected to the anode foil and the cathode foil are provided on the other main surface of the case. Since the capacitor is provided with an input terminal and an output terminal, this flat electrolytic capacitor can be used as one electronic circuit such as a filter circuit. Since the laminate is housed in a case made of a shielding material, it can be electrostatically shielded from the outside of the case. Therefore, noise generated outside the case can be prevented from directly flowing into the laminate. Further, since the input terminal and the output terminal are provided on the main surface of the case on opposite sides, the input terminal and the output terminal are shielded by the case, and noise generated on the input side affects the output side. This can be prevented.

The flat electrolytic capacitors shown in FIGS. 3 to 9 are merely examples of the present invention, and various embodiments and modifications of the present invention are possible.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of a conventional pulse power supply device. Figure 1 is a circuit diagram, Figure 2 is a perspective view showing the external shape of the device, and Figures 3 to 9 are flat type electrolyzers according to the present invention. Fig. 3 is an exploded perspective view of a laminate forming the element of the capacitor, Fig. 4 is a plan view of the laminate, and Fig. 5 is a reduced perspective view showing the outline of a flat electrolytic capacitor. Figure 6 is a sectional view taken along line 6-6 in Figure 5, and Figure 7 is a cross-sectional view along line 6-6 in Figure 5.
Figure 8 is a schematic circuit diagram of a flat electrolytic capacitor, Figure 9 is a circuit diagram showing a distributed constant circuit formed in a flat electrolytic capacitor, and Figure 10 is a cross-sectional view taken along line 7-7 of the figure. FIG. 2 is a circuit diagram of a pulse power supply device using a capacitor as a filter. Explanation of symbols, 1... Laminate, 2... Anode foil, 3
... Cathode foil, 4 ... Electrolytic paper, 8 ... Case, 9,
10... Electrode terminal (input side), 12, 13... Electrode terminal (output side).

Claims (1)

[Scope of utility model registration request] A laminate formed by laminating a plurality of pairs of anode foils and cathode foils facing each other with electrolytic paper interposed therebetween is housed in a case made of a shielding material, and connected to the anode foil and cathode foil on one main surface of the case. A flat electrolytic capacitor comprising: a plurality of input terminals connected to the anode foil and the cathode foil; and a plurality of output terminals connected to the anode foil and the cathode foil on the other main surface of the case.