CN211453920U - Fuse fusing detection circuit and communication equipment - Google Patents

Abstract

The utility model discloses a fuse blowing detection circuit and a communication device. The fuse blowing detection circuit includes a light-emitting unit and a light-detecting unit, the light-detecting unit is used to convert the light signal of the light-emitting unit into an electrical signal, and the light-emitting unit includes a first diode, a second diode, a third diode, The fourth diode and the light emitting diode, the cathodes of the first diode and the second diode are electrically connected to the anode of the light emitting diode, and the anodes of the third diode and the fourth diode are electrically connected to the cathode of the light emitting diode , the cathode of the fourth diode is electrically connected to the first end of the fuse and the anode of the first diode, and the cathode of the third diode is electrically connected to the second end of the fuse and the anode of the second diode. When the fuse blowing detection circuit of the utility model is blown, the light emitting unit works, and the output end of the light detecting unit outputs a voltage signal, which ensures that the blown state of the fuse can be fed back in time.

Description

A fuse blowing detection circuit and communication equipment

technical field

The embodiments of the utility model relate to electronic power technology, in particular to a fuse blowing detection circuit and a communication device.

Background technique

Fuse is one of the most commonly used protection devices. When the current passing through the fuse exceeds a specified value for a period of time, the heat generated by the fuse melts the melt, thereby disconnecting the circuit.

In the prior art, the fuse holder of the fuse is usually optimized to reduce the difficulty of replacing the fuse. There is a connection card board, the fuse seat is connected with the fuse through the connection card board, a blade is provided at each end of the fuse, a base plate is arranged in the base, and the upper electrode and the lower electrode are respectively arranged at the base plate, and the fuse The slotted knives at the ends are respectively inserted into the corresponding upper and lower electrodes, and the upper and lower shafts are respectively provided at the handle covers at the upper and lower ends of the fuse seat. The fuse can be easily replaced by operating the shafts.

The existing fuse disconnector cannot directly determine the on-off state of the fuse, and electric power workers must conduct an on-site survey to obtain the blown state of the fuse. Therefore, there is an urgent need for a detection circuit that can feedback the state of the fuse.

Utility model content

The utility model provides a fuse blowing detection circuit and a communication device, so that when the fuse is blown, the blown state of the fuse can be fed back in time.

In a first aspect, an embodiment of the present invention provides a fuse blowing detection circuit, which includes a light-emitting unit and a light-detecting unit, where the light-detecting unit is used to convert a light signal of the light-emitting unit into an electrical signal, and the light-emitting unit includes a first diode, a second diode, a third diode, a fourth diode and a light emitting diode, the cathodes of the first diode and the second diode and the light emitting diode The anodes are electrically connected, the anodes of the third diode and the fourth diode are electrically connected to the cathodes of the light emitting diodes, the cathodes of the fourth diodes are electrically connected to the first end of the fuse and the The anode of a diode is electrically connected, and the cathode of the third diode is electrically connected to the second end of the fuse and the anode of the second diode.

Further, the cathode of the second diode is electrically connected to the anode of the light emitting diode through a first resistor.

Further, the light emitting diodes include blue light diodes.

Further, the model of the chip used by the light detection unit includes CLS15-22C.

Further, the anode of the light detection unit is grounded through the second resistor.

Further, the anode of the light detection unit is connected to a filter circuit.

Further, it also includes a voltage comparator, the output terminal of the light detection unit is electrically connected to the first input terminal of the voltage comparator, and the second input terminal of the voltage comparator is connected to a reference level.

Further, the reference level is grounded through a third resistor and a fourth resistor, and the reference level is electrically connected to the second input terminal of the voltage comparator through the third resistor.

In a second aspect, an embodiment of the present invention also provides a communication device, including a fuse, a fuse blowing detection circuit and a DC power supply, the fuse is connected in series to a charging and discharging circuit of the DC power supply, and the fuse blowing detection circuit includes A light-emitting unit and a light-detecting unit, the light-detecting unit is used to convert the light signal of the light-emitting unit into an electrical signal, and the light-emitting unit includes a first diode, a second diode, a third diode, a Four diodes and light-emitting diodes, the cathodes of the first diodes and the second diodes are electrically connected to the anodes of the light-emitting diodes, the third diodes and the fourth diodes The anode of the LED is electrically connected to the cathode of the light-emitting diode, the cathode of the fourth diode is electrically connected to the first end of the fuse and the anode of the first diode, and the third diode is electrically connected to the anode of the first diode. The cathode is electrically connected to the second end of the fuse and the anode of the second diode.

Further, the positive pole of the DC power supply is electrically connected to the fuse through a first inductor.

Compared with the prior art, the beneficial effect of the present invention is that the fuse blowing detection circuit proposed by the present utility model uses a separate light-emitting unit and a light detecting unit to achieve electrical isolation, so that the fuse blowing detection circuit has a lightning protection function; , the light emitting unit works, and the output end of the light detection unit outputs a voltage signal, which ensures that the blown state of the fuse can be fed back in time, so that the electric power worker can know the state of the fuse without on-site investigation.

Description of drawings

1 is a structural diagram of a fuse blowing detection circuit in the first embodiment;

2 is a structural diagram of a light-emitting unit in Embodiment 1;

3 is a structural diagram of a light detection unit in Embodiment 1;

4 is a structural diagram of another light detection unit in the first embodiment;

5 is a structural diagram of another light detection unit in the first embodiment;

FIG. 6 is a structural diagram of a communication device in the second embodiment.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

Example 1

FIG. 1 is a structural diagram of a fuse blowing detection circuit in Embodiment 1. Referring to FIG. 1 , this embodiment proposes a fuse blowing detection circuit, which includes a light emitting unit 100 and a light detection unit 200 . The signal is converted into an electrical signal. The light emitting unit 100 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a light emitting diode D5. The cathode is electrically connected to the anode of the light-emitting diode D5, the anodes of the third diode D3 and the fourth diode D4 are electrically connected to the cathode of the light-emitting diode D5, and the cathode of the fourth diode D4 is electrically connected to the first end a of the fuse F1 And the anode of the first diode D1 is electrically connected, and the cathode of the third diode D3 is electrically connected to the second end b of the fuse F1 and the anode of the second diode D2. The VSEN terminal of the light detection unit 200 is the signal output terminal.

In the detection circuit shown in FIG. 1 , the two ends of the fuse F1 are connected with the light-emitting unit 100. When the fuse F1 is normal, the light-emitting unit 100 does not work. When the fuse F1 is blown, the light-emitting unit 100 works, and the light-emitting diode D5 emits light. When the optical signal is detected at 200, the output terminal VSEN outputs a voltage signal, and the fuse F1 can be judged to be blown through the voltage signal.

Specifically, when the detection circuit is working, the fuse F1 is connected in series in the circuit of the charging and discharging circuit. For example, the second end b of the fuse F1 is electrically connected to the positive electrode of the power supply, and the first end a of the fuse F1 is used as the positive end of the voltage interface. When F1 is normal, the voltages of the a terminal and the b terminal are basically equal, and no current flows through the light-emitting unit 100 . When the fuse F1 is blown, a potential difference is formed between the a terminal and the b terminal, and a current flows through the light-emitting unit 100 at this time. Diode D5, fourth diode D4, a terminal; when the potential of a terminal is higher than b terminal, the current passes through a terminal, first diode D1, light emitting diode D5, third diode D3, b terminal in sequence.

The detection circuit shown in FIG. 1 outputs a voltage signal through the output terminal VSEN of the optical detection unit 200 when the fuse F1 is blown, so as to ensure that the blown state of the fuse F1 can be fed back in time, so that electric power workers can know the fuse without on-site investigation. Status of F1. The detection circuit shown in FIG. 1 uses a separate light-emitting unit 100 and a light-detecting unit 200 to achieve electrical isolation, which can achieve an isolation strength of 20KV and achieve the purpose of preventing lightning strikes. The isolation voltage can be adjusted by changing the physical distance between the light-emitting unit 100 and the light-detecting unit 200 .

FIG. 2 is a structural diagram of a light-emitting unit in Embodiment 1. Referring to FIG. 2 , preferably, the cathode of the second diode D2 is electrically connected to the anode of the light-emitting diode R5 through the first resistor R1 . The first resistor R1 is used as a current limiting resistor to ensure that the light-emitting diode D5 is within a normal working voltage range.

FIG. 3 is a structural diagram of a light detection unit in Embodiment 1. Referring to FIG. 3 , optionally, the light emitting diodes are blue light diodes, and the light emitting diodes may also be red light diodes or green light diodes. The light detection unit adopts chip models including CLS15-22C, and the use of blue light diodes in conjunction with CLS15-22C can make CLS15-22C output a more suitable electrical signal.

The anode of the light detection unit 200 is grounded through the second resistor R2. The anode of the light detection unit 200 is connected to the filter circuit. The second resistor R2 is used as the load resistor of the light detection unit 200. When the light detection unit 200 collects the light signal, the current signal generated by the light signal is converted into a voltage signal through the second resistor R2, and the voltage signal is used as feedback after passing through the filter circuit. Signal. A first-order RC filter circuit is used in the light detection unit shown in FIG. 3 . Optionally, a higher-order RC filter circuit can also be used.

FIG. 4 is a structural diagram of another light detection unit in the first embodiment. Referring to FIG. 4 , the light detection unit 200 further includes a voltage comparator 300 , the output end VSEN of the light detection unit 200 and the first input end of the voltage comparator 300 IN+ is electrically connected, and the second input terminal IN- of the voltage comparator 300 is connected to the reference level.

The light detection unit 200 shown in FIG. 4 adds a voltage comparator 300 to improve the accuracy of the detection of the blown state of the fuse F1 through the voltage comparator 300 . The optional voltage comparator 300 adopts a model of LM339. Specifically, when the light detection unit 200 is illuminated by light, the light detection unit 200 outputs an electrical signal proportional to the light intensity, the electrical signal is compared with the set reference level signal, and when the electrical signal is greater than the reference level signal, the voltage The output terminal OUT of the comparator 300 outputs 1 to determine that the fuse F1 is blown. When the electrical signal is less than the reference level signal, the output terminal OUT of the voltage comparator 300 outputs 0 to determine that the fuse F1 is normal.

FIG. 5 is a structural diagram of another light detection unit in the first embodiment. Referring to FIG. 5 , optionally, the reference level is grounded through the third resistor R3 and the fourth resistor R4, and the reference level is connected to the voltage through the third resistor R3 and the voltage. The second input terminal IN- of the comparator 300 is electrically connected.

Optionally, in the light detection unit 200 shown in FIG. 5 , the reference level is 3.3V, and the reference level divided by the third resistor R3 and the fourth resistor R4 is connected to the second voltage comparator 300 . The input terminal IN- is compared with the electrical signal of the first input terminal IN+ to determine the state of the fuse F1.

Embodiment 2

FIG. 6 is a structural diagram of a communication device in Embodiment 2. Referring to FIG. 6 , this embodiment provides a communication device including a fuse F1 , a fuse blowing detection circuit, and a DC power supply 400 . The fuse F1 is connected in series in the charging and discharging circuit of the DC power supply 400 .

The fuse blowing detection circuit includes a light emitting unit 100 and a light detecting unit 200, and the light detecting unit 200 is used to convert the light signal of the light emitting unit 100 into an electrical signal. The light emitting unit 100 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a light emitting diode D5. The cathodes of the first diode D1 and the second diode D2 are electrically connected to the anode of the light-emitting diode D5, the anodes of the third diode D3 and the fourth diode D4 are electrically connected to the cathode of the light-emitting diode D5, and the fourth diode D3 and the fourth diode D4 are electrically connected to the cathode of the light-emitting diode D5. The cathode of the diode D4 is electrically connected to the first terminal a of the fuse F1 and the anode of the first diode D1, and the cathode of the third diode D3 is electrically connected to the second terminal b of the fuse F1 and the anode of the second diode D2. Anode electrical connection.

6, the second end b of the fuse F1 is electrically connected to the positive electrode of the DC power supply 400, and the first end a of the fuse F1 is used as the positive end of the voltage interface. When the fuse F1 is normal, the voltages of the a and b ends are basically equal, and the light is emitted. No current flows through the cell 100 . When the fuse F1 is blown, a potential difference is formed between the a terminal and the b terminal, and a current flows through the light-emitting unit 100 at this time. Diode D5, fourth diode D4, a terminal; when the potential of a terminal is higher than b terminal, the current passes through a terminal, first diode D1, light emitting diode D5, third diode D3, b terminal in sequence. When the light detection unit 200 receives the light emitted by the light-emitting diode D5, it converts the light signal into an electrical signal, and outputs it from the output terminal VSEN. The fuse F1 can be determined to be blown by the electrical signal.

The communication device proposed in this embodiment can feed back the blown state of the fuse F1 in time, so that the electric power worker can know the state of the fuse F1 without on-site investigation. At the same time, the separate light-emitting unit 100 and the light-detecting unit 200 are used to achieve electrical isolation, so that the communication device has the function of preventing lightning strikes.

Optionally, the positive pole of the DC power supply 400 is electrically connected to the fuse F1 through the first inductor L1. The negative terminal of the DC power supply 400 is electrically connected to the negative terminal of the voltage interface through the first inductor L2. By setting the first inductance L1 and the second inductance L2, the instantaneous high voltage and high current in the communication device can be absorbed, so as to enhance the lightning protection effect of the communication device.

As an alternative, the communication device in this embodiment can also use the light-emitting unit shown in FIG. 2 and any one of the light-detecting units shown in FIGS. 3 to 5, and have the same light-emitting unit or light-detecting unit as the above beneficial effect.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present utility model. Rather, the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A fuse blowing detection circuit, characterized in that it comprises a light-emitting unit and a light-detecting unit, wherein the light-detecting unit is used to convert the light signal of the light-emitting unit into an electrical signal, The light-emitting unit includes a first diode, a second diode, a third diode, a fourth diode and a light-emitting diode, The cathodes of the first diode and the second diode are electrically connected to the anode of the light emitting diode, and the anodes of the third diode and the fourth diode are electrically connected to the anode of the light emitting diode. The cathode is electrically connected, the cathode of the fourth diode is electrically connected to the first end of the fuse and the anode of the first diode, the cathode of the third diode is electrically connected to the second end of the fuse and The anode of the second diode is electrically connected. 2 . The detection circuit of claim 1 , wherein the cathode of the second diode is electrically connected to the anode of the light-emitting diode through a first resistor. 3 . 3. The detection circuit of claim 1, wherein the light emitting diode comprises a blue light diode. 4 . The detection circuit according to claim 1 , wherein the type of chip used in the light detection unit includes CLS15-22C. 5 . 5. The detection circuit of claim 4, wherein the anode of the light detection unit is grounded through a second resistor. 6. The detection circuit according to claim 4, wherein the anode of the light detection unit is connected to a filter circuit. 7 . The detection circuit according to claim 1 , further comprising a voltage comparator, the output terminal of the light detection unit is electrically connected to the first input terminal of the voltage comparator, and the voltage comparator The second input terminal is connected to the reference level. 8 . The detection circuit according to claim 7 , wherein the reference level is grounded through a third resistor and a fourth resistor, and the reference level is connected to the third resistor of the voltage comparator through the third resistor. 9 . The two input terminals are electrically connected. 9. A communication device, characterized in that it comprises a fuse, a fuse blowing detection circuit and a DC power supply, the fuse is connected in series in a charging and discharging circuit of the DC power supply, and the fuse blowing detection circuit comprises a light-emitting unit and a light-detecting unit, The light detection unit is used to convert the light signal of the light emitting unit into an electrical signal, The light-emitting unit includes a first diode, a second diode, a third diode, a fourth diode and a light-emitting diode, The cathodes of the first diode and the second diode are electrically connected to the anode of the light emitting diode, and the anodes of the third diode and the fourth diode are electrically connected to the anode of the light emitting diode. The cathode is electrically connected, the cathode of the fourth diode is electrically connected to the first end of the fuse and the anode of the first diode, and the cathode of the third diode is electrically connected to the second terminal of the fuse terminal and the anode of the second diode are electrically connected. 10. The communication device of claim 9, wherein a positive pole of the DC power supply is electrically connected to the fuse through a first inductor.

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