CN210628237U

CN210628237U - Fuse fusing alarm circuit

Info

Publication number: CN210628237U
Application number: CN201922239595.7U
Authority: CN
Inventors: 李楠; 陈恒; 李森; 刘少华
Original assignee: Xijing University
Current assignee: Xijing University
Priority date: 2019-12-14
Filing date: 2019-12-14
Publication date: 2020-05-26
Anticipated expiration: 2029-12-14

Abstract

A fuse fusing alarm circuit comprises a fuse F1, wherein one end of the fuse F1 is connected with an input power supply positive end and a triode Q1 emitter end, the other end of the fuse F1 is connected with one end of a resistor R1 and a load positive end, the other end of the resistor R1 is connected with a triode Q1 base end, a triode Q1 collector end is connected with one end of a resistor R2 and a triode Q2 base end, a load negative end is connected with a diode D1 positive end and the other end of a resistor R2, and a diode D1 cathode end is connected with an input power supply negative end; a collector end of a triode Q2 is connected with one end of a resistor R3 and a cathode end of a light-emitting diode L1, the other end of the resistor R3 is connected with a cathode end of a buzzer LS1, a positive end of the buzzer LS1 is connected with one end of a resistor R4 and a positive end of a power supply, the other end of the resistor R4 is connected with a positive end of the light-emitting diode L1, and an emitter end of a triode Q2 is connected with a load cathode end; the utility model discloses line structure is simple, and the cost is with low costs, has reliable stability and good practicality.

Description

Fuse fusing alarm circuit

Technical Field

The utility model belongs to the technical field of power protection, concretely relates to fuse fusing warning circuit.

Background

In current measurement and control electronic circuits, fuses are generally used as overcurrent protection, and when current exceeds a specified parameter value, the fuses are fused to disconnect the circuit, so that the consequences of circuit damage, burning of important devices in control equipment and the like caused by misoperation or overlarge current are prevented. At present, corresponding fuse fusing alarm circuits are not configured in part of current measuring instruments and control electronic circuits, so when the fuse fusing causes equipment use faults, a user or a maintenance person is often required to use a professional tool to detect and judge whether the equipment use faults are caused by fuse fusing or not, a large amount of maintenance time is wasted, and although the corresponding fuse fusing alarm circuits are configured in part of the current measuring instruments and the control electronic circuits, the protection mode is generally to carry out current sampling through a single chip microcomputer for protection.

Disclosure of Invention

In order to overcome the shortcoming of the prior art, the utility model aims to provide a fuse fusing warning circuit can report to the police the suggestion when fuse fusing, and the quick troubleshooting that carries on of the user of being convenient for has advantages such as with low costs, the reliability is high, it is convenient to make.

In order to achieve the above purpose, the utility model discloses the technical scheme who takes does:

a fuse fusing alarm circuit comprises a fuse F1, wherein one end of the fuse F1 is connected with the positive end of an input power supply and the emitter end of a triode Q1, the other end of the fuse F1 is connected with one end of a resistor R1 and the positive end of a load, the other end of a resistor R1 is connected with the base end of a triode Q1, the collector end of the triode Q1 is connected with one end of the resistor R2 and the base end of a triode Q2, the negative end of the load is connected with the anode end of a diode D1 and the other end of a resistor R2, and the cathode end of the diode D1 is connected with the negative end of the input power supply;

the collector terminal of the triode Q2 is connected with one end of a resistor R3 and the cathode terminal of a light-emitting diode L1, the other end of the resistor R3 is connected with the cathode terminal of a buzzer LS1, the anode terminal of the buzzer LS1 is connected with one end of a resistor R4 and the anode terminal of a power supply, the other end of the resistor R4 is connected with the anode terminal of the light-emitting diode L1, and the emitter terminal of the triode Q2 is connected with the cathode terminal of a load.

The input power supply voltage is 12V.

The buzzer LS1 is an active buzzer, the specification size is 9 × 5.5mm, and the working voltage is 3V.

The light emitting diode L1 is a colorful flickering light emitting diode with a diameter of 5mm and a working voltage of 3.2-3.4V.

The fuse F1 is a plug-in fuse, the specification size is 11 x 10mm, the rated voltage is 12V, and the rated current is 1A.

The triode Q1 is a PNP patch triode with the model of MMBT3906, the triode Q2 is an NPN patch triode with the model of S8050, and the diode D1 is a rectifier diode with the model of IN 4004.

The parameters of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are respectively 1M omega, 10k omega, 1k omega and 1k omega.

The utility model has the advantages that:

1. the sound-light alarm when the fuse F1 is fused is realized through the light-emitting diode L1 and the active buzzer LS1, a user is reminded of replacing the fuse in time, and the normal operation of the power supply equipment is guaranteed.

2. Reverse connection protection is achieved through the rectifier diode D1, and reliability of circuit design is improved.

3. The circuit design is carried out by adopting an analog circuit, the circuit structure is simple, the manufacturing cost is low, and the circuit has reliable stability and wide application prospect.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

FIG. 2 is a schematic diagram of the current flow during normal operation of the fuse.

FIG. 3 is a schematic diagram showing the flow of current when the fuse is blown.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Referring to fig. 1, the fuse blowout alarm circuit includes a fuse F1, one end of the fuse F1 is connected to the positive terminal of an input power supply and the emitter terminal of a triode Q1, the other end of the fuse F1 is connected to one end of a resistor R1 and the positive terminal of a load, the other end of the resistor R1 is connected to the base terminal of a triode Q1, the collector terminal of the triode Q1 is connected to one end of the resistor R2 and the base terminal of a triode Q2, the negative terminal of the load is connected to the anode terminal of a diode D1 and the other end of a resistor R2, and the cathode terminal of the diode D1 is connected to the negative terminal of the input power supply;

The input power supply voltage is 12V.

The utility model discloses a theory of operation does:

as shown in fig. 1 and 2, when the input power is turned on and the fuse F1 is not blown, a current flows through two ends of the fuse F1, so that a base terminal voltage of the transistor Q1 is equal to an emitter terminal voltage, the transistor Q1 is in an off state, the transistor Q2 is further in an off state, no current flows through two ends of the light emitting diode L1 and the buzzer LS1, the light emitting diode L1 and the buzzer LS1 are in an off state, and the current flows through the fuse F1 and a negative terminal of the load and then flows into a negative terminal of the input power to provide power input for the load, so that the load operates normally.

As shown in fig. 1 and 3, when fuse F1 is blown out due to misoperation or excessive current, the base terminal voltage of transistor Q1 is at low potential, the voltage difference between the emitter terminal and the base terminal of transistor Q1 is greater than 0.7V, so that transistor Q1 is turned on, at this time, the current flows through transistor Q1 and then is divided into two paths, one path flows through resistor R1, the load and then flows into the input power cathode, due to the voltage division of large resistor R1, the voltage across the load is only several hundred mv, so that the load is prevented from being damaged during short-circuit fault, the other path flows through resistor R2 and transistor Q2, since the base terminal and the emitter terminal of transistor Q2 are terminal voltages 865mv, which is greater than the minimum conducting voltage of transistor Q2 of 0.7V, transistor Q2 is turned on, at this time, the current flows from the input power anode terminal through buzzer LS1, resistor R3, resistor R4, light emitting diode L1, and transistor Q2 and then flows into the input, at the moment, the buzzer LS1 and the light emitting diode L1 have current flowing through, the buzzer LS1 buzzes, the light emitting diode L1 emits light, the user is reminded of the occurrence of fuse fusing accidents in an audible and visual alarm mode, and the user is reminded of replacing the fuse F1 in time, so that the normal operation of the load is guaranteed.

Meanwhile, in order to prevent short-circuit accidents caused by reverse connection of the power supply, corresponding reverse connection protection is carried out through the rectifier diode D1.

Claims

1. A fuse blowout alarm circuit, characterized by: the power supply circuit comprises a fuse F1, wherein one end of the fuse F1 is connected with the positive end of an input power supply and the emitter end of a triode Q1, the other end of the fuse F1 is connected with one end of a resistor R1 and the positive end of a load, the other end of the resistor R1 is connected with the base end of a triode Q1, the collector end of the triode Q1 is connected with one end of the resistor R2 and the base end of a triode Q2, the negative end of the load is connected with the anode end of a diode D1 and the other end of a resistor R2, and the cathode end of the diode D1 is connected with the negative end of the input power;

2. The circuit of claim 1, wherein: the input power supply voltage is 12V.

3. The circuit of claim 1, wherein: the buzzer LS1 is an active buzzer, the specification size is 9 × 5.5mm, and the working voltage is 3V.

4. The circuit of claim 1, wherein: the light emitting diode L1 is a colorful flickering light emitting diode with a diameter of 5mm and a working voltage of 3.2-3.4V.

5. The circuit of claim 1, wherein: the fuse F1 is a plug-in fuse, the specification size is 11 x 10mm, the rated voltage is 12V, and the rated current is 1A.

6. The circuit of claim 1, wherein: the triode Q1 is a PNP patch triode with the model of MMBT3906, the triode Q2 is an NPN patch triode with the model of S8050, and the diode D1 is a rectifier diode with the model of IN 4004.

7. The circuit of claim 1, wherein: the parameters of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are respectively 1M omega, 10k omega, 1k omega and 1k omega.