Fuse fusing automatic detection indicating circuit and electronic equipment

Abstract

The utility model provides a fuse fusing automatic detection indicating circuit and an electronic device, the fuse fusing automatic detection indicating circuit comprises a fusing indicating unit, a first voltage detection unit and a second voltage detection unit, the fusing indicating unit is used for being connected with the input end of a fuse, and the first voltage detection unit is used for detecting the fusing of the fuse. The indicating module is used for indicating the on-off state of the fuse when the fuse is fused; the first voltage detection unit is connected with the fusing indication unit and is used for enabling the fusing indication unit and the ground end to form a loop when the fuse is fused; and the second voltage detection unit is respectively connected with the output end of the fuse and the first voltage detection unit, and is used for enabling the fusing indication unit and the ground end to be in an open circuit state when the fuse is not fused. According to the utility model, automatic detection is realized by designing resistance voltage division in a hardware circuit, the change of the on-off state of the fuse is visually obtained, and maintenance work is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fuse measuring technical field especially relates to a fuse automatic detection indicating circuit and electronic equipment that fuses. BACKGROUND

[0002] As a kind of protector, fuse has been widely used in power system, when circuit fault or abnormality, fuse is when current abnormality rises to certain height, itself reaches temperature threshold and fuses and cuts off current, to play the role of protection circuit safe operation.

[0003] In prior art, commonly used detection method is using multimeter, measures resistance or measures voltage after fuse at the both ends of fuse, the defect of this fault elimination mode is in: with the wiring tendency to complexification and functionalization of controlled line in actual use, the total number of fuse in a circuit system also increases. When any group or multiple groups of fuse fuse, due to the number of fuses in fuse box, it is difficult to intuitively show where the fuse fuse. For multi-way fuse equipment, maintenance efficiency is low, increases maintenance judgment time, is prone to miss the best opportunity of circuit maintenance in emergency power supply place.

[0004] Therefore, prior art still needs to be improved and developed. CONTENT OF UTILITY MODEL

[0005] In view of the above deficiencies of prior art, the purpose of the utility model is to provide a kind of circuit and electronic equipment for automatically detecting fuse fusing, automatically detect by hardware circuit, resistance voltage division method, when fuse fusing, LED state prompts that the loop fuse fusing, to solve the problem of low maintenance efficiency caused by difficult to directly determine the fuse on-off state in multi-line fuse equipment.

[0006] The technical scheme of the utility model is as follows:

[0007] A kind of fuse automatic detection indicating circuit for indicating the on-off state of fuse, it includes: fusing indicating unit, first voltage detection unit, second voltage detection unit, wherein:

[0008] The fusing indicating unit is used to connect with the input end of fuse, for indicating the on-off state of fuse when fuse fusing;

[0009] The first voltage detection unit is connected with the fusing indicating unit, for forming loop between the fusing indicating unit and ground terminal when fuse fusing;

[0010] The second voltage detection unit is connected with the output end of the fuse and the first voltage detection unit, and is used for making the fuse indication unit and the ground end in an open circuit state when the fuse is not blown.

[0011] In a further embodiment of the utility model, the first voltage detection unit comprises a first field effect tube and a first resistor.

[0012] The source of the first field effect tube is grounded, the gate of the first field effect tube is connected with the second voltage detection unit, and the drain of the first field effect tube is connected with the fuse indication unit.

[0013] The first resistor is connected with the gate of the first field effect tube and is used for sampling the voltage value of the power supply input end.

[0014] In a further embodiment of the utility model, the first field effect tube is an NMOS switch tube.

[0015] In a further embodiment of the utility model, the second voltage detection unit comprises a second field effect tube and a voltage dividing unit.

[0016] The gate of the second field effect tube is connected with the voltage dividing unit, the source of the second field effect tube is connected with the voltage dividing unit and the grounding point respectively, and the drain of the second field effect tube is connected with the first voltage detection unit.

[0017] The voltage dividing unit is connected with the gate of the second field effect tube, the power supply output end and the grounding point respectively, is used for outputting a voltage signal after voltage division to the gate of the second field effect tube, and according to the working state change of the fuse, the voltage detection value at the gate of the second field effect tube also changes, thereby controlling the conduction and cut-off of the second field effect tube.

[0018] In a further embodiment of the utility model, the voltage dividing unit comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the fuse and the power supply output end, the other end of the third resistor and one end of the fourth resistor are connected with the gate of the second field effect tube, and the other end of the fourth resistor is grounded.

[0019] In a further embodiment of the utility model, the second field effect tube is an NMOS switch tube.

[0020] In a further embodiment of the utility model, the fuse indication unit comprises a first light emitting diode and a second resistor, wherein the anode of the first light emitting diode is connected with the power supply input end, the cathode of the first light emitting diode is connected with the first voltage detection unit, one end of the second resistor is connected with the cathode of the first light emitting diode, and the other end of the second resistor is connected with the first voltage detection unit.

[0021] Based on the same utility model concept, the utility model also provides a fuse automatic detection indicating device, including power supply, fuse and fuse automatic detection indicating circuit as described above, fuse automatic detection indicating circuit is connected to both ends of fuse, the input end of power supply is connected with the input end of fuse, the output end of power supply is connected with the output end of fuse.

[0022] The utility model provides a kind of circuit and electronic equipment of automatic detection fuse, and wherein, the fuse automatic detection indicating circuit includes: fuse indication unit, first voltage detection unit, second voltage detection unit, and wherein: the fuse indication unit is used to connect with the input end of fuse, for when fuse is fused, the on-off state of fuse is indicated;First voltage detection unit is connected with the fuse indication unit, for when fuse is fused, the fuse indication unit is formed with ground end loop;Second voltage detection unit is connected with the output end of fuse and first voltage detection unit respectively, for when fuse is not fused, the fuse indication unit and ground end are in open circuit state.The utility model is realized by designing resistance voltage division in hardware circuit Automatic detection, change the state of fuse indication unit and prompt the fuse of this loop is fused, so that the change of fuse on-off state is obtained intuitively, and maintenance work is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0024] Figure 1 It is a functional module architecture diagram of the fuse automatic detection indicating circuit in the utility model.

[0025] Figure 2 It is a circuit principle diagram of the fuse automatic detection indicating circuit in the utility model.

[0026] Reference signs in the drawings: 100, fuse indication unit;200, first voltage detection unit;300, second voltage detection unit;310, voltage division unit. DETAILED DESCRIPTION

[0027] The utility model provides a fuse automatic detection indicating circuit and electronic equipment, in order to make the purpose, technical scheme and effect of the utility model more clear, explicit, the following refers to the drawing and holds the example to the utility model further detailed explanation. It should be understood that the specific embodiments described herein are merely intended to explain the utility model and are not intended to limit the utility model.

[0028] In the embodiments and the patent application scope, unless the article has a special definition in the text, "a", "an", "said" and "the" can also include the plural form. If the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the description purpose, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature.

[0029] It should be further understood that the phrase "comprising" used in the specification of the utility model means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there can be intermediate elements. In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.

[0030] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood as having meanings consistent with those in the prior art, and unless specifically defined as here, they should not be interpreted with idealized or overly formal meanings.

[0031] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled persons in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0032] Please also refer to Figure 1 And Figure 2 , the preferred embodiment of the fuse automatic detection indicating circuit in the utility model is shown in the figure. As Figure 1The utility model provides an automatic detection indicating circuit of fuse link fusing, including: fusing indicating unit 100, fuse, first voltage detection unit 200, second voltage detection unit 300, wherein, fusing indicating unit 100 with first voltage detection unit 200 is connected, is used for receiving conducting current when fuse fusing, the on-off state of fuse F1 in schematic circuit, fuse F1 is located between power supply input and power supply output, is used for when detecting temperature is greater than threshold temperature, fusing automatically, thereby protecting circuit, first voltage detection unit 200 is connected with second voltage detection unit 300 and fusing indicating unit 100 respectively, is used for dividing voltage and detecting the voltage change in the power supply input end side circuit after dividing voltage, controls the working condition of fusing indicating unit 100 according to the comparison result of detection value and first voltage threshold, when detection value is higher than first voltage threshold, fusing indicating unit 100 indicates that fuse F1 has fused, otherwise, fusing indicating unit 100 does not indicate that fuse F1 has fused, second voltage detection unit 300 is connected with voltage dividing module and ground, is used for dividing voltage and detecting the voltage change in the circuit of power supply output end side after dividing voltage, controls the voltage value at first voltage detection unit 200 according to the comparison result of detection value and second voltage threshold, if detection value is higher than second voltage threshold, then pulls down first voltage detection unit 200 to ground potential, otherwise, then second voltage detection module circuit breaks down.

[0033] Specifically, the first voltage detection unit 200 contains a pre-set first voltage threshold, when the voltage detection value corresponds to greater than the first voltage threshold, the first voltage detection unit 200 is turned on, when the voltage detection value is less than the first voltage threshold, the first voltage detection unit 200 is cut off. Similarly, the second voltage detection unit 300 corresponds to contain a pre-set second voltage threshold, when the voltage detection value corresponds to greater than the second voltage threshold, the second voltage detection unit 300 is turned on, when the voltage detection value is less than the second voltage threshold, the second voltage detection unit 300 is cut off. The first voltage detection unit 200 and the second voltage detection unit 300 are used for dividing voltage to the circuit, and comparing the voltage value to be detected after dividing voltage with the corresponding voltage threshold.

[0034] When the circuit is working normally, the fuse F1 is internally conducting, the voltage between the power input terminal and the power output terminal is substantially equal, at this time, the voltage value of the power output terminal after voltage division in the second voltage detection unit 300 is greater than the second voltage threshold, the second voltage detection unit 300 is conducting, and the first voltage detection unit 200 is pulled down to the ground. At this time, the detection voltage at the first voltage detection unit 200 is necessarily less than the first voltage threshold, and the first voltage detection unit 200 is cut off. The fuse indication unit 100 is in the same loop as the first voltage detection unit 200, when the first voltage detection unit 200 is cut off, no current passes through the fuse indication unit 100, and the loop in which the fuse indication unit 100 is located is disconnected in the normal working state of the fuse.

[0035] When the current in the circuit exceeds the pre-set parameter value, the fuse F1 is fused, and the power input terminal Vin and the power output terminal Vout are considered to be disconnected. At this time, the voltage at the power output terminal Vout is zero, the second voltage detection unit 300 is connected to the power output terminal Vout, and the voltage detection value of the second voltage detection unit 300 is zero. At this time, the second voltage detection unit 300 is cut off, the first voltage detection unit 200 is not pulled down by the second voltage detection unit 300, the voltage detection value at the first voltage detection unit 200 is the voltage of the power input terminal after voltage division, and the voltage measurement value is greater than the first voltage threshold, so the first voltage detection module is conducting. The fuse indication unit 100 is in the same loop as the first voltage detection unit 200, when the first voltage detection unit 200 is conducting, there is working current in the fuse indication unit 100, indicating that the fuse in the circuit is fused.

[0036] Further, please refer to Figure 2 , the first voltage detection unit 200 comprises a first field effect tube Q1 and a first resistor R1. The first voltage threshold is the gate opening voltage of the first field effect tube Q1. The source of the first field effect tube Q1 is grounded, the gate of the first field effect tube Q1 is connected with the second voltage detection unit 300, and the drain of the first field effect tube Q1 is connected with the fuse indication unit 100. The first resistor R1 is connected with the gate of the first field effect tube Q1, and is used for sampling the voltage value of the power input terminal. The source of the first field effect tube Q1 is grounded, the drain of the first field effect tube Q1 is connected with the fuse indication unit 100, and according to the change of the working state of the fuse F1, the voltage detection value at the gate of the second field effect tube Q2 also changes, thereby controlling the conduction and cut-off of the second field effect tube Q2.

[0037] Specifically, the first field effect transistor Q1 is an NMOS switch tube. When the fuse F1 is working normally, the second voltage detection unit 300 is turned on, at this time, the gate of the first field effect transistor Q1 is forcibly pulled down to the ground level by the second voltage detection unit 300, then the gate-source voltage Vgs of the first field effect transistor Q1 is zero, which is obviously less than the gate-on voltage. Therefore, the source-drain of the first field effect transistor Q1 is cut off, the circuit of the fuse indication unit 100 is cut off, when the fuse F1 is turned on, the fuse indication unit 100 does not work. When the fuse is blown, the second voltage detection module is cut off, the gate of the first field effect transistor Q1 is connected to the first resistor R1, the first resistor R1 is placed between the power supply input end and the gate of the first field effect transistor Q1, for voltage division of the input voltage of the power supply input end, at this time, the gate-source voltage Vgs is greater than the gate-on voltage, the source-drain of the first field effect transistor Q1 is turned on, the current at the power supply input end Vin flows through the fuse indication unit 100, the first field effect transistor Q1 to the ground, the fuse indication unit 100 works, indicating the blown state of the fuse F1.

[0038] Further, the second voltage detection unit 300 includes a second field effect transistor Q2 and a voltage dividing unit 310, wherein the second voltage threshold is the gate-on voltage of the second field effect transistor Q2. The gate of the second field effect transistor Q2 is connected to the voltage dividing unit 310, the source of the second field effect transistor Q2 is connected to the voltage dividing unit 310 and the ground respectively, and the drain of the second field effect transistor Q2 is connected to the first voltage detection unit 200; the voltage dividing unit 310 is connected to the gate of the second field effect transistor Q2, the power supply output end and the ground respectively, for outputting a voltage signal after voltage division to the gate of the second field effect transistor Q2, according to the working state change of the fuse, the voltage detection value at the gate of the second field effect transistor Q2 also changes, thereby controlling the turn-on and cut-off of the second field effect transistor Q2.

[0039] Specifically, the second field effect transistor Q2 is an NMOS switch tube. The source of the second field effect transistor Q2 is connected to ground, and the gate-source voltage Vgs of the second field effect transistor Q2 corresponds to the voltage at the gate. The third resistor R3 and the fourth resistor R4 are used to divide the voltage value of the power output terminal Vout. The gate of the second field effect transistor Q2 is connected to the third resistor R3 and the fourth resistor R4, respectively, and the voltage detection value at the gate is the voltage value of the power output terminal after being divided by the third resistor R3 and the fourth resistor R4. When the fuse F1 is working normally, the voltage of the power output terminal is substantially equal to the voltage at the power input terminal, the voltage detection value at the gate of the second field effect transistor Q2 is greater than the gate opening voltage, and the source-drain of the second field effect transistor Q2 is turned on. The drain of the second field effect transistor Q2 is connected to the gate of the first field effect transistor Q1 and the source of the second field effect transistor Q2 is connected to ground. When the source-drain of the second field effect transistor Q2 is turned on, the gate of the first field effect transistor Q1 is connected to ground. The second field effect transistor Q2 is used to pull down the voltage detection value at the first field effect transistor Q1 when the fuse is working normally.

[0040] Further, by adding the fourth resistor R4 between the source and the gate of the second field effect transistor Q2, the fourth resistor R4 is used as a discharge resistor to discharge the charge stored at the gate while providing a bias voltage for the second field effect transistor Q2, preventing the gate-source of the second field effect transistor Q2 from being broken down and reducing the false operation of the second field effect transistor Q2. When the fuse F1 in the circuit is blown, the fuse F1 is considered to be open, and at this time, the voltage at the power output terminal in the system is zero, and the voltage detection value at the gate of the second field effect transistor Q2 output from the third resistor R3 and the fourth resistor R4 in the voltage dividing unit 310 is less than the gate opening voltage. The second field effect transistor Q2 is cut off, and the voltage detection value at the gate of the first field effect transistor Q1 is determined by the voltage value of the power input terminal voltage after being divided by the first resistor R1.

[0041] The fuse indication unit 100 includes a first light emitting diode LED1 and a second resistor R2. The anode of the first light emitting diode LED1 is connected to the power input terminal, the cathode of the first light emitting diode LED1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the drain of the first field effect transistor Q1. Specifically, when the current value in the fuse indication unit is greater than the working current of the first light emitting diode, the first light emitting diode normally emits light to indicate the blown state of the fuse; when the current value in the fuse indication unit is less than the working current of the first light emitting diode, the first light emitting diode does not emit light to indicate the working state of the fuse. Maintenance personnel can quickly determine whether the fuse in the corresponding circuit is blown by observing whether the first light emitting diode in the fuse indication unit emits light.

[0042] Please combine Figure 1 and Figure 2 , Vin is a power input terminal, Vout is a power output terminal, GND is a ground terminal, Q1 and Q2 are a first field effect transistor Q1 and a second field effect transistor Q2, F1 is a fuse, LED is a light emitting diode, R1, R2, R3 and R4 are a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 respectively. When the fuse F1 works normally, the voltage of the power input terminal Vin is transmitted to the power output terminal Vout through the fuse F1, and the voltage at both ends of Vin and Vout is basically equal. The voltage of the power output terminal Vout is divided by the third resistor R3 and the fourth resistor R4 in series, and the midpoint of the third resistor R3 and the fourth resistor R4 is connected to the gate of the second field effect transistor Q2 to provide a high level for the gate of the second field effect transistor Q2. The gate-source voltage Vgs of the second field effect transistor Q2 is greater than the opening voltage, the second field effect transistor Q2 is turned on, the gate voltage of the first field effect transistor Q1 is pulled down to GND by the second field effect transistor Q2, the gate-source voltage Vgs of the first field effect transistor Q1 is less than the opening voltage, and the first field effect transistor Q1 is cut off. Then the power input terminal Vin, the first light emitting diode LED1, the second resistor R2 and the first field effect transistor Q1 do not form a current loop, and the first light emitting diode LED1 does not emit light. When the fuse F1 is blown, the voltage of the power output terminal Vout is zero, the voltage of the power output terminal Vout after being divided by the third resistor R3 and the fourth resistor R4 in series is also zero, and the voltage applied to the gate of the second field effect transistor Q2 is also zero. The gate-source voltage Vgs of the second field effect transistor Q2 is less than the opening voltage, and the second field effect transistor Q2 is cut off. At this time, the gate of the first field effect transistor Q1 will not be pulled down by the second field effect transistor Q2, the voltage of the power input terminal Vin is pulled up to the gate of the first field effect transistor Q1 through the first resistor R1 to provide a high voltage, the gate-source voltage Vgs of the first field effect transistor Q1 is greater than the opening voltage, the first field effect transistor Q1 is turned on, and the voltage of the power input terminal Vin forms a current loop through the first light emitting diode LED1, the second resistor R2 and the first field effect transistor Q1 to GND. At this time, the first light emitting diode LED1 emits light. Further, the rated current of the fuse F1 is 80A, and the parameters of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can be set to 4.7KΩ, 100KΩ, 100KΩ and 100KΩ respectively.

[0043] It should be noted that in other preferred embodiments, the first light emitting diode in the fuse indication circuit can also be provided with a buzzer or a loudspeaker to realize sound and light alarm, so that the fuse blowing can be indicated only when the working current is met, and the fuse normal working can be indicated only when no current is detected. The implementation principle is consistent with the above-mentioned preferred embodiments, and will not be repeated here.

[0044] The utility model still provides a kind of automatic detection indicating system of fuse blowing, it includes power supply, load and the fuse blowing automatic detection indicating circuit described in above preferred embodiment, wherein, the power supply, the load and the fuse blowing automatic detection indicating circuit are electrically connected between.

[0045] To sum up, the utility model provides a kind of fuse blowing automatic detection indicating circuit and electronic equipment, with the following beneficial effects: the utility model is realized automatic detection by designing resistance voltage division in hardware circuit, when fuse is normal work, fuse indication unit normal work, when fuse blows, change the state of the fuse indication unit and prompt the loop fuse blowing.Obtain the change of fuse on-off state intuitively, shorten troubleshooting time, improve maintenance efficiency, protect the detection and control mode of circuit.

[0046] It should be understood that the application of the utility model is not limited to the above examples, and those skilled in the art can improve or change according to the above description, and all these improvements and changes shall belong to the protection scope of the claims attached to the utility model.

Claims

1. An automatic fuse blowout detection and indication circuit, used to indicate the on / off state of a fuse, characterized in that, The application relates to an automatic fuse-fusing detection and indication circuit. The application relates to an automatic fuse-fusing detection and indication circuit. The first voltage detection unit is connected with the fuse-fusing indication unit, and is used for forming a loop between the fuse-fusing indication unit and a ground terminal when the fuse fuses. The first voltage detection unit comprises a first field effect transistor and a first resistor. The source of the first field effect transistor is connected with the ground, the gate of the first field effect transistor is connected with the second voltage detection unit, and the drain of the first field effect transistor is connected with the fuse-fusing indication unit.

2. The automatic detection and indication circuit for a fuse link according to claim 1, characterized in that, The first resistor is connected with the gate of the first field effect transistor, and is used for sampling the voltage value of a power supply input terminal. The first field effect transistor is an NMOS switch tube. The second voltage detection unit comprises a second field effect transistor and a voltage dividing unit.

3. The automatic detection and indication circuit for a fuse link according to claim 2, characterized in that, The gate of the second field effect transistor is connected with the voltage dividing unit, the source of the second field effect transistor is connected with the voltage dividing unit and a grounding terminal respectively, and the drain of the second field effect transistor is connected with the first voltage detection unit.

4. The automatic detection and indication circuit for a fuse link according to claim 1, wherein The voltage dividing unit is connected with the gate of the second field effect transistor, a power supply output terminal and the grounding terminal respectively, is used for outputting a voltage signal after voltage division to the gate of the second field effect transistor, and changes the voltage detection value at the gate of the second field effect transistor according to the working state change of the fuse, so as to control the conduction and cut-off of the second field effect transistor. The voltage dividing unit comprises a third resistor and a fourth resistor. The second field effect transistor is an NMOS switch tube.

5. The automatic detection and indication circuit for a fuse link according to claim 4, characterized in that, The fuse-fusing indication unit comprises a first light emitting diode and a second resistor.

6. The automatic detection and indication circuit for a fuse link according to claim 5, wherein The application further relates to a power supply, a fuse and the automatic fuse-fusing detection and indication circuit.

7. The automatic detection and indication circuit for a fuse link according to claim 1, wherein ​ 8. An electronic device, comprising: ​

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