JPS6051255B2 - non-inductive 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, paper 1, cathode foil 2, paper 3, and anode foil 4 are stacked as shown in FIG.
Electrode leads 5E and 6 are attached to the winding ends E of both electrode foils 2 and 4.
E are provided respectively, and these papers 1, 3 and electrode foil 2
, 4 are wound from the starting end S into an element 7 having a shape as shown in FIG. 1, and impregnated with an electrolytic solution. 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, 6S, and 6E of the element 7 are connected to the terminals 11, 12, 13, and 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 ΔC by the rectifier 16 is given to the capacitor element 7, flows through the anode foil 4, flows through the load 17, and on the return path flows through the cathode foil 2 again to the rectifier 16.
Return to In this application example, electrode leads 5E and 6E can be connected to the rectifier side and 5S and 6E can be connected to the load side as shown in the figure, or electrode leads 5S and 6E can be connected to the load side as shown in the figure.
It has been observed that the impedance of the capacitor becomes particularly small when S is connected to the rectifier side and 5E and 6E are connected to the load side. However, the first
When the non-inductive capacitor shown in Fig. 2 and Fig. 2 is applied to a power supply circuit, the electrode foils 2 and 4 of the capacitor have a large resistance because they are generally 20 to 100μ thick. , 4 in addition to the ripple current 11 and the load current 12 flowing in a superimposed manner, the capacitor generates a large amount of heat, which poses a practical problem.

The present invention seeks to provide a non-inductive capacitor that eliminates the above-mentioned drawbacks. Below, this invention will be explained in Figure 4~
FIG. 10 will be explained.

An example of a non-inductive capacitor according to the present invention is shown in FIG.
As shown in b, 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, respectively. Electrode leads 5E and 6E are provided at the winding ends E of both electrode foils 2 and 4, respectively.
Furthermore, band-shaped metal conductors 18 and 19 having a predetermined width and a predetermined thickness are arranged 5 at arbitrary positions in the width direction on the upper surfaces of the electrode foils 2 and 4 from near the starting ends to near the terminal ends of the electrode foils 2 and 4. , these papers 1 and 3, electrode foils 2 and 4, and strip metal conductor 18,
19 is wound from the starting end to form an element 7 having a shape as shown in FIG. 4c, and is impregnated with an electrolyte.

As shown in FIG. 5, the element 7 is made of aluminum 4
and is fixed with a fusible insulating material 9.

The electrode leads 5S, 5E, 6S, 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. 6 shows an example of application of a non-inductive capacitor embodying the above-described invention to a power supply circuit.

A pulsating current obtained by rectifying the alternating current AC by the rectifier 16 is given to the capacitor element 7, and the ripple current 11 flows from the anode foil 4 of the element 7, through the papers 1 and 3, through the cathode foil 2, and returns to the rectifier 16, where it becomes a load current. 12 flows through the band-shaped metal conductor 19, flows through the load 17, returns to the band-shaped metal conductor 18, and returns to the rectifier 16. In this application example, electrode leads 5E (terminal 12) and 6E (terminal 14) are connected to the rectifier side as shown in the figure, and electrode leads 5S (terminal 11) and 6S (terminal 13) are connected to the rectifier side.
．． Connect the electrode lead 5 to the load side, or completely reverse the electrode lead 5.
It is recognized that the impedance of the capacitor becomes particularly small when S (terminal 11) and 6S (terminal 13) are connected to the rectifier side, and 5E (terminal 12) and 6E (terminal 14) are connected to the load side. Since the load current 12 flows through the strip metal conductors 18 and 19 while flowing through the electrode foils 2 and 4, the capacitor does not generate heat and the temperature rise is small. Another example of a non-inductive capacitor according to the present invention is shown in FIGS. 7A and 7B.
As shown in the figure, paper 1, cathode foil 2, paper 3, and anode foil 4 are stacked, electrode leads 5S and 6S are provided at the starting ends S of both electrode foils 2 and 4, respectively, and the windings of both electrode foils 2 and 4 are Electrode leads 5E and 6E are provided at the terminal ends E, respectively, and thick portions 2A and 4A having a predetermined width and a predetermined thickness are provided on the upper surfaces of the electrode foils 2 and 4 at arbitrary positions in the width direction. 4 from the starting end to the terminal end, and the electrode foils 2 and 4 on which the papers 1 and 3 and the thick parts 2A and 4A are formed are wound from the starting end to form an element 7 having a shape as shown in FIG. 7c. It is rolled up and impregnated with electrolyte.

Then, as shown in FIG. 5, the element 7 is housed in aluminum 8 and fixed to a fusible insulating material 9.

The electrode leads 5S, 5E, 6S, 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. 8 shows an example of application of another example of a non-inductive capacitor embodying the above-described invention to a power supply circuit.

The pulsating current obtained by rectifying the AC 11 LAC by the rectifier 16 is given to the capacitor element 7, and the ripple current 11 flows from the anode foil 4 of the element 7, through the papers 1 and 3, to the cathode foil 2, and then to the rectifier 1.
Return to step 6, load current 1. flows through the thick part 19 of the anode foil 4, flows through the load 17, and returns to the thick part 1 of the cathode foil 2 on the return path.
8 and returns to the rectifier 16. In this application example, electrode leads 5E (terminal 12) and 6E (terminal 14) are shown.
) to the rectifier side, and connect 5S (terminal 11) and 6S (
Either connect terminal 13) to the load side, or conversely, connect electrode leads 5S (terminal 11) and 6S (terminal 13) to the rectifier side, and connect electrode leads 5E (terminal 12) and 6E (terminal 14) to the rectifier.
) is connected to the load side, the impedance of the capacitor becomes particularly small, and since the load current 12 flows through the thick portions of the electrode foils 2 and 4, the capacitor does not generate heat and the temperature rise is small. 9 shows the frequency characteristic at 25°C of the conventional non-inductive capacitor shown in FIG. 1 as a curve 21, and the frequency characteristic at 25°C of the embodiment shown in FIG. 4 of the present invention as a curve 22. .

Each non-inductive capacitor has a length of 2840T0r.
L1 width 68.5W$L, thickness 90μ anode foil, length 28
40Tr$L1 width 68.5WL1 thickness 30p cathode foil and 2840T0Tt1 width 6? , which is wound with a band-shaped metal conductor having a thickness of 200 μm and has a rating of 4700 pF and 150 WV. Figure 10 shows the load current vs. temperature rise characteristics.
A comparison of the conventional non-inductive capacitor 23 shown in FIG. 1 and the non-inductive capacitor 24 of the present invention shown in FIG.

As described above, this invention has a four-terminal configuration in which pairs of band-shaped electrode foils are wound with a dielectric material interposed between them, and electrode leads are attached to each of the electrode foils near the beginning and end of the winding. without invitation
4. In a conductive capacitor, a strip-shaped metal conductor is placed on both electrode foils at any position in the width direction with a predetermined width and a predetermined thickness, or This is a non-inductive capacitor in which a thick part of a predetermined width and thickness is formed at any position in the width direction on the top surface of both electrode foils from near the start end to near the end, which greatly reduces the inductance caused by the electrode foils and reduces ripple current. Reference numeral 11 indicates the electrode foil of the capacitor, and since the load current 12 flows through the strip metal conductor or the thick part of the electrode foil, the capacitor generates less heat and the temperature rise is small, causing no practical problems and having great industrial value.

[Brief explanation of drawings]

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 supply p-wave circuit using a conventional non-inductive capacitor. , FIG. 4 is an explanatory diagram and sketch of an example of a non-inductive capacitor element according to the present invention, FIG. 5 is a vertical cross-sectional view of the non-inductive capacitor according to the present invention, and FIG. 6 is a power supply using the non-inductive capacitor according to the present invention. Connection diagram of Okinami circuit, No. 7
The figure shows an explanatory diagram and sketch of another example of the element of the non-inductive capacitor of the present invention, Fig. 8 is a wiring diagram of a power supply offshore circuit using the non-inductive capacitor of the present invention, and Fig. 9 shows a conventional non-inductive capacitor and FIG. 10 is a frequency characteristic curve diagram of the non-inductive capacitor of the seventh invention, and a load current-temperature rise characteristic diagram of the conventional non-inductive capacitor and the non-inductive capacitor of the present invention. 1 and 3: paper, 2: cathode foil, 2A: two thick parts of cathode foil, 4: anode foil, 4A: thick part of anode foil 4, 5S and 6S: electrode lead at the beginning of winding, 5E and 6E: Electrode lead at the end of the winding, 7: capacitor element, 11, 12, 13 and 14: terminal, 16: rectifier, 17: load, 18 and 19: strip-shaped 5 metal conductive plate, 11: ripple current, 12:
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 strip-shaped metal conductor having a predetermined width and a predetermined thickness is disposed at any position in the width direction of the upper surface of the electrode foil from near the starting end to near the ending end. 2. A non-inductive capacitor having a four-terminal configuration in which a pair of electrode foils is wound with a dielectric layer interposed between them, and electrode leads are attached near the beginning and end of each electrode foil, respectively. A non-inductive capacitor characterized in that a thick wall portion having a predetermined width and a predetermined thickness is formed on an electrode foil at any position in the width direction on the upper surface thereof from a starting end to a terminal end.