SU729689A1 - Device for indicating fuse blow-out - Google Patents

Description

The invention relates to the field of automation and relates to embedded control. It can be used in radio equipment, electrical equipment and power sources, in particular, in various switchboards, control panels or in other electrical devices with fuses.

An electrical fuse is known with an indicator device comprising a monitored fuse, an indicator lamp and a limiting resistor connected in parallel to the monitored fuse, and an additional resistor connected in parallel with the power source after the fuse I.

If a monitored fuse malfunctions, even when the load is disconnected, the signal lamp lights up, as its current in this case passes through an additional resistor.

The disadvantage of this device is the impossibility of using a neon lamp in low-voltage circuits, and replacing it with an incandescent lamp and requires a few limiter and additional values.

resistors, which leads to unproductive consumption of electrical energy, as well as to an increase in the size of the device due to the use of resistors with large dissipation properties. Besides,

If the fuse is faulty and the load is connected, part of the current passing through the indicator lamp and the limiting resistor also passes through the load, which in some cases can lead to malfunctioning of the devices that have a load or accident.

A fuse failure warning circuit is known, comprising monitored fuses, a transistor, diodes, zener diodes, resistors, a relay and a warning lamp. If any of the fuse fails, the malfunction is indicated by a LED, n () dc, a LED connected to this fuse, inserted into the emitter of the transistor, and an indicator lamp, which is turned on by the executive relay, which is the load of the graisistor (2 |.

Claims (3)

It is also known the device. Ignits 1rglpkh; Ing (mi. Go. Shell diode and trans: stst () p, the base of which through a resistor and collector through the signal lamp connects to the positive terminal, the fuse is connected by one output to the negative terminal | 3. The disadvantage of it is the absence of a signaling the safety of the fuse when disconnected at the front side, as well as the passage of a part of the indication current and displacement of the transistor through the load with an irreversible fuse. ignoring a fault in the fuse regardless of whether or not there is a load by excluding the passage of current through the load when the fuse is defective. This goal is achieved in that the proposed device for indicating a fuse fuse containing a diode and a transistor, the base of which is connected through a resistor and collector through a signal lamp a positive terminal, a fuse, one terminal of which is connected to the negative terminal, the cathode of the diode is connected to another terminal who fuses, the anode to the base of the transistor, and the transistor emitter connected to the negative terminal. } 1a the schematic diagram shows the circuit diagram of the proposed device for signaling 1 and the failure of fuses in DC circuits. A device for indicating a fuse blown circuit contains a monitored fuse 1, included in the gap of the power supply minus bus, a transistor 2, the emitter of which is connected to a monitored fuse from the power supply side, the base of the transistor through a diode 3 in direct connection - to a monitored load detector and through a resistor 4 - with the second 1 nippa sawing, which through the signal lamina 5 is connected to the collector of transistor 2. The device works as follows. barely 1-transition emigger base of transistor 2 zashuntiroman low resistance fuse 1 and open the diode 3, so that current protekayuts1, e1o through the base-emitter junction is insufficient for opening tranzist1) ra 2, and the signal lamp 5 is not illuminated. When the fuse 1 blows through the resistor 4 and the base-emitter junction of the transistor 2 flows through the TLC sufficient to open it. Transistor 2 will open, a current will flow through it and the signal lamp 5, and the lamp will come on, signaling a fault in the fuse. Using the invention allows, with smaller dimensions of the device, to provide reliable signaling of a monitored fuse failure, even when the load is disconnected, and also to exclude the possibility of any current passing through the load at a faulty fuse, which is especially important when the load is electromagnetic devices, as well as to meet the requirements of equipment security. In addition, the proposed device is more economical in manufacturing. The invention provides a device for indicating a fuse blown, containing a diode and a transistor, the base of which is connected to the positive terminal via a signal lamp through a resistor and collector, a fuse whose single output is connected to the negative terminal, characterized in that, in order to increase reliability by eliminating passing the current through the load with a faulty fuse, the cathode of the diode is connected to another fuse terminal, the anode to the base of the transistor, and the emiter of the transistor at connected to the negative terminal. Sources of information taken into consideration by the examination 1.UK patent number 1177135, cl. H 24 V, 1973. 2.Patent of France No. 2232830, cl. H 01 M 85/30, 1973. 3. The copyright certificate (C (L number 550698, class H, 01 H 85/30, 1974. - S four- ( DZ