JPH0757977A - Electrolytic capacitor with monitor line - Google Patents

Abstract

PURPOSE:To provide an electrolytic capacitor which can be used in an enclosed residential environment and to facilitate location of failure in a capacitor by preventing induction of secondary trouble. CONSTITUTION:A fuse 4 is built in an electrolytic capacitor with monitor line in series with lead wires 2, 3 and a monitoring temperature fuse 5, having melting point lower than the boiling point of electrolyte in a capacitor element 1 and the melting point of the fuse 4, is disposed in the capacitor element 1. Monitoring lead wires 6, 7 are led out from the opposite ends of the monitoring temperature fuse 5 to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor, and more particularly to an electrolytic capacitor which can be used in a sealed living environment with higher safety.

[0002]

2. Description of the Related Art In a manned environment consisting of a special container isolated from the atmosphere, that is, in a closed living environment, when a large-capacity electrolytic capacitor (wet capacitor) is desired in order to house the equipment within a limited volume. There are many. Conventionally, this type of electrolytic capacitor is simply an electrolytic capacitor in which a lead terminal is directly connected to the electrolytic capacitor element, or an electrolytic capacitor in which a temperature fuse is connected between the capacitor element and the lead terminal is adopted. It was

For example, in Japanese Patent Laid-Open No. 58-191418, as shown in FIG. 3, the cathode 5 of the capacitor element 51 is
4, a cathode lead wire 55 is connected via a fuse 56, an anode lead wire 53 is directly connected to an anode lead wire 52, and a solid electrolytic capacitor having a structure covered with a resin mold 57 is disclosed. Although not shown in the drawings, Japanese Utility Model Laid-Open No. 36029/1990 discloses a capacitor provided with a thermal fuse for safety between an inner terminal and an outer terminal.

[0004]

However, in the worst case, in an electrolytic capacitor in which lead terminals are directly connected to the electrolytic capacitor element, even if the internal temperature rises due to a failure of the capacitor element, this temperature rise cannot be detected. However, there is a problem that it bursts and the electrolyte is released to the outside, thus contaminating the human living environment. In this case, the capacitor can be housed in a closed container, but there is a problem that the volume and weight increase. In addition, JP-A-58
In the electrolytic capacitor disclosed in Japanese Patent Laid-Open No. 191418, in which a thermal fuse is connected between a capacitor element and a lead terminal, when the electrolytic capacitor fails and emits high heat, the thermal fuse is blown to ensure safety. I am taking measures. However, the conventional installation position of the thermal fuse operates inaccurately and is insufficient as a safety measure. In particular, from the viewpoint of ensuring the safety of the enclosed living environment, it is necessary to avoid leaving an unstable element in the safety. Further, when the electrolytic capacitor fails and the fusing failure of the thermal fuse due to high heat is not detected, if the device continues to operate as it is, a secondary failure may be induced. Further, there is a problem that it is not possible to easily identify whether the failure is in the electrolytic capacitor or in other parts.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. It prevents discharge of electrolytic solution from a capacitor element due to a failure or the like, enables use in a closed living environment, and induces a secondary failure due to a capacitor failure. It is also an object of the present invention to provide an electrolytic capacitor with a monitoring line, which can prevent the occurrence of the above and can easily identify the location of the capacitor failure.

[0006]

In order to achieve the above object, the present invention according to claim 1 provides an electrolytic capacitor having a temperature fuse in series with a lead wire, wherein the boiling point of the electrolytic solution of the electrolytic capacitor and the temperature fuse A monitoring temperature fuse having a melting point lower than the melting point is installed in the capacitor element, and monitoring leads are connected to both ends of the monitoring temperature fuse and led out to the outside.
Further, the present invention according to claim 2 is characterized in that a monitoring temperature fuse having a melting point lower than the boiling point of the electrolytic solution of the electrolytic capacitor is installed in the capacitor element, and monitoring leads are provided at both ends of the monitoring temperature fuse. Is connected and led out to the outside.

[0007]

In the present invention according to claim 1 configured as described above, when the capacitor element emits high heat due to a failure or the like, it is used for monitoring at a temperature before the thermal fuse is blown and before the boiling point of the electrolytic solution of the capacitor element. The thermal fuse always blows first. Further, in the present invention according to claim 2, the monitoring temperature fuse is surely blown at a low temperature before the boiling point of the electrolytic solution of the capacitor element whose temperature has risen due to a failure or the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of an electrolytic capacitor of an embodiment corresponding to claim 1. The capacitor element 1 has lead wires 2 and 3, and a built-in fuse 4 is connected in series to one lead wire 2. Further, a monitoring temperature fuse 5 is installed at a position in direct contact with the capacitor element 1, and monitoring leads 6 and 7 connected to the monitoring temperature fuse 5 are led out of the electrolytic capacitor. The monitoring temperature fuse 5 blows at a temperature lower than the boiling point of the electrolytic solution of the capacitor element 1 and the melting point of the built-in fuse 4. Therefore, since the monitoring temperature fuse 5 is always blown before the capacitor element 1 reaches a burst temperature due to high heat, the electrolytic solution is not discharged to the outside to contaminate the living environment. Further, since the monitoring temperature fuse 5 is blown at a temperature lower than the melting point of the built-in fuse 4, at least double safety measures can be taken and the electrolytic capacitor can be used safely in a sealed environment.

FIG. 2 shows each electrolytic capacitor 10, 11, 1.
2 lead wires 40, 41, 4 in separate circuits
It is a circuit diagram connected by 2,43,44,45. Each monitoring lead wire 20, 21, 22, 23, 24,
25 is connected in series by connection lines 30, 31, 32, 33, and the monitoring temperature fuse 5 of each electrolytic capacitor 10, 11, 12 is connected in series. Therefore, for example, if an abnormality occurs in the electrolytic capacitor 11 and the temperature inside the electrolytic capacitor 11 rises, the monitoring temperature fuse 5 is heated at a temperature before the built-in fuse 4 is blown.
Will melt down. Due to the melting of the monitoring temperature fuse 5, the connection lines 30, 31, 32, 33 are disconnected. If the disconnection of the connection lines 30, 31, 32, 33 is detected and the power supply to the circuit is stopped, the electrolytic capacitor 1
Since 0, 11, and 12 are not operated in a state where they are disconnected from the circuit, it is possible to prevent the induction of the secondary failure. Further, it becomes possible to easily identify the electrolytic capacitor 11 that has failed, and repair work such as maintenance can be easily performed.

Next, although not shown, another embodiment corresponding to claim 2 is an electrolytic capacitor in which the built-in fuse 4 is omitted from the electrolytic capacitor of the above-mentioned embodiment. Since the monitoring temperature fuse 5 melts down at a temperature lower than the boiling point of the electrolytic solution of the capacitor element 1, the monitoring temperature fuse 5 must melt before the capacitor element 1 reaches a rupture temperature due to high heat, and the electrolytic solution is exposed to the outside. It is not released into the environment and pollutes the living environment. Further, when used as shown in FIG. 2, the electrolytic capacitors 10, 11, 12 are not operated in a state of being disconnected from the circuit, and it is possible to prevent the induction of the secondary failure. Further, it becomes possible to easily identify the electrolytic capacitor 11 that has failed, and repair work such as maintenance can be easily performed.

[0011]

As described above, according to the electrolytic capacitor with a monitoring wire of the present invention, it is possible to completely prevent the electrolytic solution from being discharged from the capacitor element due to a failure or the like, and to use it in a sealed living environment. In addition, the electrolytic capacitor is not operated separately from the circuit, and it is possible to prevent the secondary failure caused by the capacitor failure. Further, the location of the capacitor failure can be easily identified.

[Brief description of drawings]

FIG. 1 is a sectional view of an electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a configuration diagram in which a monitoring lead wire of the same is connected.

FIG. 3 is a perspective view showing a conventional electrolytic capacitor.

[Explanation of symbols]

1 Capacitor element 2, 3, 40, 41, 42, 43, 44, 45 Lead wire 4 Built-in fuse 5 Monitoring temperature fuse 6, 7, 20, 21, 22, 23, 24, 25 Monitoring lead wire 10, 11,12 Electrolytic capacitor 30, 31, 32, 33 Connection line

Claims (2)

[Claims] 1. An electrolytic capacitor having a thermal fuse in series with a lead wire, wherein a thermal fuse for monitoring a boiling point of an electrolytic solution of the electrolytic capacitor and a melting point lower than a melting point of the thermal fuse is installed in a capacitor element, and An electrolytic capacitor with a monitoring wire, characterized in that a monitoring lead wire is connected to both ends of the monitoring temperature fuse and led out to the outside. 2. A monitoring temperature fuse having a melting point lower than the boiling point of the electrolytic solution of the electrolytic capacitor is installed in the capacitor element, and monitoring leads are connected to both ends of the monitoring temperature fuse to the outside. An electrolytic capacitor with a monitoring line that is derived.