Indicator lamp circuit for monitoring fusing of fuse

Abstract

The utility model discloses an indicating lamp circuit used for monitoring fusing of a fuse. The indicating lamp circuit comprises a power supply input end connected with a power supply, a first LED lamp, a first triode, a first resistor and a second resistor. Wherein the power supply input end is grounded through the fuse, the first resistor and the second resistor in sequence; the power input end is further electrically connected with a collector electrode of the first triode through the first LED lamp, a base electrode of the first triode is electrically connected to a line between the first resistor and the second resistor, and an emitting electrode of the first triode is grounded; the first triode is an NPN type triode. According to the utility model, the fusing condition of the fuse can be monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of fuse melting monitoring, in particular to an indicator lamp circuit for monitoring the melting of a fuse. Background Art

[0002] As an overcurrent and current protection device, a fuse is widely used to prevent circuit damage. Fuses are generally used in power supply equipment. A fuse is generally connected in series in the power circuit of a circuit. When the current in the circuit exceeds a predetermined limit value, the fuse melts and disconnects the circuit to protect other devices in the circuit loop. In a power management device, a computer is used to detect the working status of each power supply. Once a situation where the fuse of a certain power supply melts occurs, it is very difficult to quickly determine such a fault. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an indicator lamp circuit for monitoring the melting of a fuse, which can realize real-time monitoring of the melting condition of the fuse.

[0004] To solve the above technical problem, the utility model discloses an indicator lamp circuit for monitoring the melting of a fuse, which includes a power input terminal connected to a power supply, a first LED lamp, a first triode, a first resistor and a second resistor;

[0005] Wherein, the power input terminal is grounded through the fuse, the first resistor and the second resistor in sequence; the power input terminal is also electrically connected to the collector of the first triode through the first LED lamp, the base of the first triode is electrically connected to the line between the first resistor and the second resistor, and the emitter of the first triode is grounded;

[0006] The first triode is an NPN type triode.

[0007] As an optional implementation manner, it further includes a second LED lamp and a second triode;

[0008] One end of the second LED lamp is electrically connected to the power input terminal, and the other end is electrically connected to the collector of the second triode; the base of the second triode is electrically connected to the line between the first resistor and the second resistor; the emitter of the second triode is electrically connected to the emitter of the first triode;

[0009] The second triode is a PNP type triode.

[0010] As another optional implementation manner, it further includes a third resistor; the base of the second triode is electrically connected to the line between the first resistor and the second resistor through the third resistor.

[0011] As another alternative embodiment, it further includes a fourth resistor; the fourth resistor is disposed on the line between the power input terminal and the first LED lamp.

[0012] As another alternative embodiment, the fourth resistor is further disposed on the line between the power input terminal and the second LED lamp.

[0013] As another alternative embodiment, the resistance value of the fourth resistor is 100 - 1000 Ω.

[0014] As another alternative embodiment, the power input terminal is connected to a DC power supply.

[0015] Compared with the prior art, the embodiment of the present utility model has the following beneficial effects:

[0016] In the embodiment of the present utility model, the lighting and extinguishing conditions of the LED lamp correspond to the fusing conditions of the fuse one by one, and the fusing state of the fuse can be directly seen from the state of the LED lamp, so as to realize the real-time monitoring of the fusing condition of the fuse; in addition, the current of the base of the first triode is restricted by the shunt effect of the first resistor and the second resistor to protect the first triode. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0018] Figure 1 FIG. is a schematic structural diagram of an indicator lamp circuit for monitoring the fusing of a fuse according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0020] Refer to Figure 1 , the embodiment of the present utility model discloses an indicator lamp circuit for monitoring the fusing of a fuse F1, including a power input terminal Vin connected to a power supply, a first LED lamp LED1, a first triode Q1, a first resistor R1, and a second resistor R2;

[0021] Wherein, the power input terminal Vin is grounded through the fuse, the first resistor R1 and the second resistor R2 in sequence; the power input terminal Vin is also electrically connected to the collector of the first triode Q1 through the first LED lamp LED1, the base of the first triode Q1 is electrically connected to the line between the first resistor R1 and the second resistor R2, and the emitter of the first triode Q1 is grounded;

[0022] The first triode Q1 is an NPN type triode.

[0023] In the embodiment of the present utility model, when the fuse works normally without damage: the Vb of the Q1 triode is approximately equal to 0, the Q1 triode is turned on, and the LED1 is lit. When the fuse is damaged: the Vb of the Q1 triode is greater than 0.7V, the Q1 triode is turned off, and the LED1 is extinguished. Therefore, whether the LED1 is extinguished can be used to determine the fusing condition of the fuse.

[0024] In the embodiment of the present utility model, the lighting and extinguishing conditions of the LED lamp correspond one-to-one to the fusing condition of the fuse. The fusing state of the fuse F1 can be intuitively seen through the state of the LED lamp, realizing real-time monitoring of the fusing condition of the fuse; in addition, the current of the base of the first triode Q1 is restricted by the shunt effect of setting the first resistor R1 and the second resistor R2 to protect the first triode Q1.

[0025] In an optional embodiment, it further includes a second LED lamp LED2 and a second triode Q2;

[0026] One end of the second LED lamp LED2 is electrically connected to the power input terminal Vin, and the other end is electrically connected to the collector of the second triode Q2; the base of the second triode Q2 is electrically connected to the line between the first resistor R1 and the second resistor R2; the emitter of the second triode Q2 is electrically connected to the emitter of the first triode Q1;

[0027] The second triode Q2 is a PNP type triode.

[0028] This embodiment adds an LED lamp to improve the accuracy of determining the fusing condition of the fuse. Wherein, when the fuse works normally without damage: the Vb of the Q1 triode is approximately equal to 0, the Q1 triode is turned on, and the LED1 is lit; the Vb of the Q2 triode is approximately equal to 0, the Q2 is turned off, and the LED2 cannot be turned on. When the fuse is damaged: the Vb of the Q2 triode is greater than 0.7V, the Q2 triode is turned on, and the LED2 is lit; the Vb of the Q1 triode is greater than 0.7V, the Q1 triode is turned off, and the LED1 is extinguished. It can be seen that the two LED lamps will not be extinguished or lit simultaneously. Only when one LED lamp is lit and the other LED lamp is extinguished can it be determined that the conduction state of the LED lamp at this time can reflect the fusing condition of the fuse.

[0029] In yet another alternative embodiment, a third resistor R3 is further included; the base of the second triode Q2 is electrically connected to the line between the first resistor R1 and the second resistor R2 via the third resistor R3. The third resistor R3 is used to limit the current of the base of the second triode Q2 to protect the second triode Q2.

[0030] In yet another alternative embodiment, a fourth resistor R4 is further included; the fourth resistor R4 is disposed on the line between the power input terminal Vin and the first LED lamp LED1. It is used to limit the current passing through the first LED lamp LED1 to protect the first LED lamp LED1.

[0031] In yet another alternative embodiment, the fourth resistor R4 is further disposed on the line between the power input terminal Vin and the second LED lamp LED2. It is used to limit the current passing through the second LED lamp LED2 to protect the second LED lamp LED2.

[0032] In yet another alternative embodiment, the resistance value of the fourth resistor R4 is 100 - 1000 Ω. Specifically, the resistance value of the fourth resistor R4 is determined according to the voltage of the input power supply and the current of the second LED lamp LED2, and the ratio of the voltage value of the input power supply to the current value of the second LED lamp LED2 should be less than 10.

[0033] In yet another alternative embodiment, the power input terminal Vin is connected to a DC power supply.

[0034] What is disclosed in the content of the embodiments of the present invention is only the preferred embodiments of the present invention, and is only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that; they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indicator circuit for monitoring fuse blow, characterized in that, It includes a power input terminal connected to a power supply, a first LED lamp, a first triode, a first resistor, and a second resistor; Among them, the power input terminal is grounded successively through the fuse, the first resistor, and the second resistor; the power input terminal is also electrically connected to the collector of the first triode through the first LED lamp, the base of the first triode is electrically connected to the line between the first resistor and the second resistor, and the emitter of the first triode is grounded; The first triode is an NPN type triode.

2. The indicator light circuit according to claim 1, wherein It also includes a second LED lamp and a second triode; One end of the second LED lamp is electrically connected to the power input terminal, and the other end is electrically connected to the collector of the second triode; the base of the second triode is electrically connected to the line between the first resistor and the second resistor; the emitter of the second triode is electrically connected to the emitter of the first triode; The second triode is a PNP type triode.

3. The indicator light circuit according to claim 2, wherein, It also includes a third resistor; the base of the second triode is electrically connected to the line between the first resistor and the second resistor through the third resistor.

4. The indicator light circuit according to claim 2, wherein It also includes a fourth resistor; the fourth resistor is arranged on the line between the power input terminal and the first LED lamp.

5. The indicator light circuit according to claim 4, wherein The fourth resistor is also arranged on the line between the power input terminal and the second LED lamp.

6. The indicator light circuit according to claim 4 or 5, characterized in that, The resistance value of the fourth resistor is 100 - 1000 Ω.

7. The indicator light circuit according to claim 1, characterized in that, The power input terminal is connected to a DC power supply.

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