JPS5833701Y2 - low impedance electrolytic capacitor - Google Patents

Description

[Detailed description of the invention] This invention is a low impedance electrolytic capacitor that uses two electrolytic capacitors and connects the same polarity of the anode terminal and cathode terminal with a conductor. It provides capacitors.

For example, in a power supply device such as a switching regulator, it is necessary to reduce the impedance at high frequencies of an electrolytic capacitor used in a smoothing circuit in order to remove high frequency noise.

In a conventional two-terminal electrolytic capacitor, the inductance of lead wires and the like is large, so the impedance increases when the frequency exceeds 10 KHz, as shown by the broken line in FIG.

Therefore, if an electrolytic capacitor having such impedance characteristics is used in a high frequency smoothing circuit, the output ripple will be large and a sufficient effect cannot be obtained.

Furthermore, as shown in Figure 2, in the low-impedance 4-terminal electrolytic capacitors that have been put into practical use, the temperature of the capacitor element increases as DC current passes through the inside of the capacitor, which has a negative effect on maintaining the characteristics of the capacitor. give.

The present invention eliminates the drawbacks of the conventional low impedance electrolytic capacitor as described above, and embodiments of the present invention will be described below with reference to the drawings.

In Figure 3, the bottoms of two existing two-terminal type capacitors are joined together and covered with an insulating sleeve 8, and the respective anode terminals 3, 3 and cathode terminals 4, 4 are connected by a conductor 7, and one terminal is connected to the other. is the current terminal and the other terminal is the voltage terminal.

Further, in FIG. 4, lead wires 6 are connected from two capacitor elements 5 to each other.
, and weld them to the anode terminal 3 and cathode terminal 4, respectively.
Insert the case 1 into the penetrated case 1 from both sides, tighten the case 1, and connect the terminal 3゜3 and the terminals 4 and 4 to the conductor 7 respectively.
One terminal is a current terminal and the other terminal is a voltage terminal.

In this way, the conductor 7 used to connect two capacitors
has a large inductance because the distance between the two poles is wide and the distance between the same poles is long.

Therefore, since the electrolytic capacitor with the structure of the present invention constitutes a filter circuit formed by two capacitors and a conductor with large inductance, the impedance at high frequencies is as shown by the solid line in Figure 5, compared to the conventional one. This results in a significant decrease compared to the structural one.

Furthermore, the conventional four-terminal type capacitor shown in FIG. 2 has a special structure in which the lead wires 6 of the anode 3 and cathode 4 are taken out from the same element 5 on both sides, making the structure complex and difficult to manufacture. In contrast, the electrolytic capacitor of the present invention allows existing capacitors or capacitor elements to be used as they are, so it has the advantage of being easy and inexpensive to manufacture, and the DC current can be passed through the conductor 7 to the capacitor. Since the DC current flows outside the DC current, there is no restriction on the passing DC current.

As described above, the impedance of an electrolytic capacitor can be easily lowered with the structure of the present invention, so when this electrolytic capacitor is used in a high frequency smoothing circuit, it absorbs high frequency noise and has no adverse effect on other electronic components and electrical equipment. Extremely excellent practical effects can be obtained without giving any adverse effects.

[Brief explanation of drawings]

Figure 1 is a connection diagram of a conventional 4-terminal electrolytic capacitor, Figure 2 is a longitudinal sectional front view of the same 4-terminal electrolytic capacitor,
3 and 4 are longitudinal sectional front views showing an embodiment of the low impedance electrolytic capacitor of the present invention, and FIG. 5 is a conventional 4
FIG. 3 is a comparison diagram of impedance frequency characteristics of a terminal type electrolytic capacitor and a low impedance electrolytic capacitor of the present invention. 1... Case, 2... Sealing plate, 3...
...Anode terminal, 4...Cathode terminal, 5...
... Capacitor element, 6 ... Lead wire, 7.
...Conductor, 8...Insulating sleeve.

Claims (1)

[Scope of utility model registration request] A low-impedance electrolytic capacitor in which the bottoms of two capacitors are joined together, and the same-pole terminals of each capacitor are connected with a conductor, with one terminal serving as a current terminal and the other terminal serving as a voltage terminal.