JPS5832489B2 - muyudou capacitor - Google Patents

Description

[Detailed Description of the Invention] This invention significantly reduces the inductance caused by the electrode foil, and the ripple current is configured to flow through the electrode foil, and the load current is configured to flow through the strip metal conductor or the thick part of the electrode foil. This relates to a four-terminal type non-inductive capacitor.

Non-inductive capacitors having a four-terminal configuration as shown in FIGS. 1 and 2 are known in order to significantly reduce the inductance caused by the electrode foil and raise the limit of the usable frequency.

In this non-inductive capacitor, as shown in FIG. 1a, paper 1, cathode foil 2, paper 3, and anode foil 4 are stacked, and electrode leads 5S and 6S are provided at the starting ends S of both electrode foils 2 and 4, Electrode leads 5E and 6E are provided at the winding end E of both electrode foils 2.4, respectively, and these papers 1, 3 and electrode foil 2.4 are wound from the starting end S to form the shape shown in Fig. 1. element 7 and impregnated with electrolyte.

As shown in FIG. 2, the element 7 is housed in an aluminum container 8 and fixed with a fusible insulating material 9.

The electrode leads 5S, 5E, 68, 6E of the element 7 are connected to the terminals 11, 12, 13°14 provided on the lid 10 made of an insulator.
The opening of the container 8 is fixed with rivets on the back side of the lid 10 and the opening edge of the container 8 is tightened 15 inward.
sealed by.

FIG. 3 shows an example of application of the above-mentioned well-known non-inductive capacitor to a power supply circuit.

The pulsating current obtained by rectifying the alternating current AC by the rectifier 16 is given to the capacitor element 7, flows through the anode foil 4, flows through the load 17, and flows through the cathode foil 2 again on the return path to the rectifier 16.
Return to

In this application, electrode leads 5E and 6E are shown.
The impedance of the capacitor becomes especially small when connecting the electrode leads 5S and 6S to the rectifier side and connecting 5S and 6E to the load side, or conversely, connecting the electrode leads 5S and 6S to the rectifier side and connecting 5E and 6E to the load side. It is recognized that

However, when the non-inductive capacitors shown in FIGS. 1 and 2 described above are applied to a power supply circuit, the electrode foils 2 and 4 generally used for electrolytic capacitors have a thickness of 20 to 100 μm.
Therefore, the resistance is large, and the electrode foil 2 of this capacitor
, 4 in addition to the ripple current 11 and the load current I2 flowing in a superimposed manner, the capacitor generates a large amount of heat, which poses a practical problem.

The present invention aims to provide a non-inductive capacitor that eliminates the above-mentioned drawbacks.

This invention will be explained below with reference to FIGS. 4 to 11.

As one method for solving the above-mentioned drawbacks, as shown in FIG.
Coils 18 and 19 are inserted between E, 6S and 6E, respectively.The ripple current I is connected to a rectifier (not shown), for example.
→ Electrode lead 6E → Electrode foil 4 → Paper 1, 3 → Electrode foil 2 → Electrode lead 5E → Rectifier, and the load current ■2 is, for example, a rectifier (not shown) → Electrode lead 6E → Coil 19 → Electrode lead 6S → Load (not shown) → Electrode lead 5S → Coil 18 → Electrode lead 5E → Rectifier and flow, load current ■2
does not flow through the electrode foils 2 and 4, the capacitor does not generate heat and the temperature rise is reduced.

In the present invention, the coils 18 and 19 are of course housed in the capacitor container 8, and the positional relationship with the capacitor element 7 and the shapes of the coils 18 and 19 will be described below for each embodiment.

FIG. 5 shows that when winding the capacitor element 7, first wind the conductor around the winding core through an insulating layer, and then attach the coil 18 to the upper part.
A coil 19 is formed at the bottom, and the capacitor element 7 is wound around the outer peripheries of the coils 18 and 19 by overlapping the papers 1 and 3 and the electrode foil 2°4, and between the starting end electrode lead 5S and the winding end electrode lead 5E. The coil 18 is connected to the coil 19 between the start end electrode lead 6S and the winding end electrode lead 6E.

Figure 6 shows an upper coil 18 and a lower coil formed by winding a capacitor element 7 by overlapping papers 1, 3 and electrode foils 2, 4 around a winding core, and then winding a conductive wire through an insulating layer. 19 into the winding core trace hole of the capacitor element 7, and place the coil 18 between the start end electrode lead 5S and the winding end electrode lead 5E.
A coil 19 is connected between the start end electrode lead 6S and the winding end electrode lead 6E.

In FIG. 7, a capacitor element 7 is wound by overlapping papers 1, 3 and electrode foils 2, 4 around the winding core, and a conductive wire is wound around the outer circumference of this capacitor element 7 with an insulating layer interposed therebetween. The lower coil 19 is formed, and the coil 18 is placed between the starting end electrode lead 5S and the winding end electrode lead 5E, and the starting end electrode lead 6
A coil 19 is connected between each of the coils S and the winding end electrode lead 6E.

Figure 8 shows an upper coil 18 and a lower coil formed by winding a capacitor element 7 by overlapping papers 1, 3 and electrode foils 2, 4 around a winding core, and then winding a conducting wire through an insulating layer. The capacitor element 7 is inserted into the hollow part of the coil 19, and the coil 18 is connected between the start end electrode lead 5S and the winding end electrode lead 5E, and the coil 19 is connected between the start end electrode lead 6S and the winding end electrode lead 6E.

In Figure 9, the capacitor element 7 is wound by overlapping papers 1 and 3 and electrode foils 2 and 4 around the winding core, and as shown in Figure 10, two flat conductors are wound in parallel in a rectangular spiral shape. The formed coils 18 and 19 are wound around the outer periphery of the capacitor element 7, and the coil 18 is placed between the start end electrode lead 5S and the winding end electrode lead 5E, and between the start end electrode lead 6S and the winding end electrode lead 6.
The coils 19 are connected between the terminals E and E, respectively.

Incidentally, since this flat conductor is wound around the outer periphery of the capacitor element 7 as shown in FIG. 9, it is preferable to use a foil-like conductor (thin one) so that it can be easily bent when a coil is formed.

Figure 11 shows coils 18 and 19 formed by winding two flat conductors in parallel in a circular spiral shape (spiral shape), which are arranged on the top or bottom surface of the wound capacitor element (not shown). can do.

Coils 18 and 19 shown in FIGS.
was placed at the top and coil 19 at the bottom, but coil 18
may be disposed at the bottom and the coil 19 at the top.

Alternatively, coils 18 and 19 may be used in which two conductive wires are wound in parallel without distinguishing between upper and lower parts.

In Fig. 10, coils 18 and 19, which are two flat conductors wound in parallel in a rectangular spiral, are wound around the outer circumference of the capacitor element 7 as shown in Fig. 9, but one flat conductor is wound in a square spiral. The two coils are wound around the capacitor element to form a coil, and the two coils are arranged around the outer circumference of the capacitor element so that each has a half circumference, or each is arranged so that it has one circumference or more.
and 19 may be formed.

In Fig. 11, it has been described that the coils 18 and 19, which are two flat conductors wound in parallel in a circular spiral shape, are arranged on the top or bottom surface of the capacitor element, but one flat conductor is wound in a circular spiral shape. It is also possible to wind the coils to form a coil, and to arrange two of these coils one on top of the other on the upper or lower surface of the capacitor element, or to arrange them on the upper and lower surfaces of the capacitor element, respectively.

In the non-inductive capacitor of the present invention, as shown in the above-mentioned embodiment, the coil is disposed using the space of the capacitor element or the space between the capacitor container and the capacitor element, so it is necessary to make the capacitor container particularly large. The ripple current (1) flows through the electrode foil of the capacitor, and the load current (2) flows through the coil, so the capacitor generates less heat and the temperature rise is small, causing no practical problems. , has great industrial value.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram and sketch of the elements of a conventional non-inductive capacitor, Fig. 2 is a vertical cross-sectional view of a conventional non-inductive capacitor, and Fig. 3 is a wiring diagram of a power filter circuit using a conventional non-inductive capacitor. , FIG. 4 is an explanatory diagram of a non-inductive capacitor equipped with a coil according to the present invention, FIGS. 5 to 8 are cross-sectional views of each embodiment of the non-inductive capacitor according to the present invention, and FIG. Front view of an embodiment of an inductive capacitor, No. 10
Figures 1 and 11 are plan views of embodiments of the coil used in the non-inductive capacitor of the present invention. 1 and 3: paper, 2: cathode foil, 4: anode foil, 5S and 6S: electrode lead at the start of the winding, 5E and 6E electrode lead at the end of the second winding, 7: capacitor element, 16: rectifier, 17:
Load, 18 and 19: Coil, 11: lJ tuple current, ■2: Load current.

Claims (1)

[Claims] A pair of electrode foils is wound with a dielectric layer interposed between them, and electrode leads are attached to each electrode foil near the beginning and end of the winding to form a four-terminal configuration. A non-inductive capacitor, characterized in that a coil is disposed on the winding core trace or on the outer periphery of the capacitor element, and the coil is connected to the electrode lead between the pair of electrode foils. In a non-inductive capacitor that is wound with a dielectric layer interposed therebetween and has an electrode lead attached near the beginning and end of each electrode foil to form a four-terminal configuration, a coil in which a flat conductor is spirally wound is used. A non-inductive capacitor characterized in that the coil is wound around the outer circumference of the capacitor element or arranged on the upper and lower surfaces of the capacitor element, and the coil is connected to the electrode lead.