JPS63200429A - Fuse monitoring system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a fuse monitoring system, and can be used to check when a fuse in an electric circuit is blown.

BACKGROUND ART AND PROBLEMS TO BE SOLVED BY THE INVENTION Electrical circuits are usually provided with fuses to prevent damage to electrical components connected to the circuit or burnout of the circuit itself due to failure of the circuit. has become common sense, but in recent years this circuit has become increasingly complex with the increase in automation control, etc., and in addition to the fuse for the entire circuit, there are also more fuses for each block circuit.
As fuses become more widely used, there are an increasing number of commonly used fuses such as fusible links and blade-type fuses, which are difficult to visually confirm from the outside if they blow due to circuit failure. In order to find the location of the failure, it is very troublesome to visually check from the outside to see which fuse is blown.

Therefore, the present invention aims to make it possible to easily and easily check whether or not these fuses are blown by visual inspection from the outside.

Means for Solving the Problems This invention provides an electric circuit provided with a fuse (1) that is blown by abnormal current, which does not turn on when the fuse (1) is energized, but lights up when the fuse (1) blows. The structure is of a fuse monitor type, characterized in that a display device (2) is connected in parallel with the fuse (1).

The working power source of the invention and various loads are connected, and between these various loads and ms, for example, a fusible link is used for a relatively large capacity load, and a blade type fuse, etc. is used for a relatively small capacity load. Connect the fuses (1) and
) by connecting an indicator (2) such as a light emitting diode or lamp to the parallel circuit.
When 1) is operating normally, the indicator (2) is directly connected to the fuse (1) in the circuit and does not light up, but if the fuse (1) is blown by an abnormal current, the main current is cut off. However, the display device (2) is connected in series in a circuit and lights up.

Effects of the Invention As described above, even if the fuse (1) blows due to abnormal current, the indicator (2) lights up, so that the blowing of the fuse (1) can be easily and easily confirmed by visual observation from the outside. Therefore, even though the fuse (1) is used more frequently due to automated control, etc. in recent years, it is difficult to visually confirm that the fuse (1) is blown from the outside as in the past, and it is difficult to confirm that the fuse (1) has blown out in the event of a circuit failure. There is no need to bother with checking which fuse (1) is blown by visual inspection from the outside in order to find a failure location.

Embodiment In the illustrated example, one end of a fusible link (IA) as a fuse (1) used for relatively large-capacity loads is connected to the positive side of a battery (3) whose negative side is grounded, and this fuse Connect one end of a light emitting diode (2A) that lights up as a monitor indicator (2) when the fusible link (IA) is blown out due to abnormal current to the bull link (IA) and the parallel circuit. One end of a relatively large capacity load (4) is connected to the other end (a) of the connection between the fusible link (IA) and the light emitting diode (2A) connected to the parallel circuit, and the other end is Ground it. Furthermore, one end side of the blade type fuse (IB) as the fuse (1) used for relatively small capacity loads is connected to the other end side (A), and the blade type fuse (IB) is connected to the other end side (A).
) and one end side of a light emitting diode (2B) that lights up as the indicator (2) for monitoring when the blade type fuse (IB) is blown by abnormal current are connected to the parallel circuit. The connected blade fuse (
IB) and the light emitting diode (2B) to the other end of the connection,
One end of a relatively small capacity load (5) is connected and the other end is grounded.

Normally, when a relatively large capacity load (4) is operated, current from the battery (3) flows through the fusible link (IA) to the load (4), and also when a relatively small capacity load (5) is operated.
During operation, current from the battery (3) passes through the fusible link (IA) and then through the blade type fuse (I
B) to the load (5). However, in such an operating state, if excessive current flows due to an abnormality in the fusible link (IA) circuit or the load (4) circuit, the fusible link (IA) will melt and the load (4) will
Radio waves are blocked, but at the same time the light emitting diode (2A
) and lights up.

In addition, if excessive current flows due to an abnormality in the load (5) circuit, the blade type fuse (IB) will melt and the load (5) will melt.
The current to 5) is cut off, but at the same time, the current waves to the light emitting diode (2B) and it lights up. By lighting up the light emitting diodes (2A) and (2B) in this way, it is possible to easily and easily confirm whether the fuse (1) has blown out by visual inspection from the outside.

Additionally, this fuse monitor can be used in any electrical circuit.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, and FIG. 1 is a block diagram of an electric circuit. In the figure, symbol (1) indicates a fuse, and symbol (2) indicates a display.

Claims (1)

[Claims] In an electric circuit provided with a fuse (1) that blows due to abnormal current, an indicator (2) that does not light up when the fuse (1) is energized but lights up when the fuse (1) blows is connected to the fuse (1). A fuse monitor method characterized by parallel connections.