CN220271535U - Intelligent low-voltage junction box - Google Patents
Intelligent low-voltage junction box Download PDFInfo
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- CN220271535U CN220271535U CN202321903376.4U CN202321903376U CN220271535U CN 220271535 U CN220271535 U CN 220271535U CN 202321903376 U CN202321903376 U CN 202321903376U CN 220271535 U CN220271535 U CN 220271535U
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Abstract
The utility model relates to the technical field of low-voltage distribution, and provides an intelligent low-voltage junction box which comprises a leakage detection circuit, wherein the leakage detection circuit comprises an inductor L1, a switch tube Q1, a resistor R3, a capacitor C1, an NOT gate U2, an NOT gate U6 and an NOT gate U3, a first end of the inductor L1 is connected with a control end of the switch tube Q1, a first end of the switch tube Q1 is connected with a 5V power supply, a second end of the switch tube Q1 is grounded through the resistor R3, a second end of the switch tube Q1 is connected with an input end of the NOT gate U1, an output end of the NOT gate U1 is connected with a first input end of the NOT gate U6, an output end of the NOT gate U6 is connected with an input end of the NOT gate U2 through a capacitor C1, an output end of the NOT gate U6 is connected with an input end of the NOT gate U6, and an output end of the NOT gate U6 is connected with a first input end of a main control unit. Through the technical scheme, the problem of low accuracy of the cable connector insulation fault detection circuit in the related technology is solved.
Description
Technical Field
The utility model relates to the technical field of low-voltage power distribution, in particular to an intelligent low-voltage junction box.
Background
In urban power grid construction, a low-voltage line cable is used as a current-carrying main body and a terminal for power transmission, and loads in a user distribution network are transferred and branched through a low-voltage junction box, so that the purpose of power supply and distribution is achieved. The safety of the low-voltage cable plays a decisive role in the safety of the power line, so that the low-voltage junction box plays a role in detecting faults of the power line besides completing power distribution, wherein the insulation faults of the cable connector are an important problem, the insulation faults of the cable connector can generate electric leakage, so that electric shock accidents are caused, the detection of the insulation faults of the cable connector is particularly important for effectively reducing the occurrence of the electric power accidents, and the problem of low precision of the insulation fault detection circuit of the traditional cable connector is solved.
Disclosure of Invention
The utility model provides an intelligent low-voltage junction box, which solves the problem of low accuracy of a cable joint insulation fault detection circuit in the related art.
The technical scheme of the utility model is as follows:
the intelligent low-voltage junction box comprises a main control unit, a leakage detection circuit and a wireless communication unit, wherein the leakage detection circuit is connected with the main control unit, the main control unit is in communication connection with a communication terminal by means of the wireless communication unit, the leakage detection circuit comprises an inductor L1, a resistor R2, a switching tube Q1, a resistor R3, a resistor R4, a capacitor C1, an NOT gate U2, an NOT gate U6 and an NOT gate U3,
the first end of inductance L1 is connected with the first end of resistance R2, the second end of inductance L1 is grounded, the second end of resistance R2 is connected with the control end of switch tube Q1, the first end of switch tube Q1 is connected with a 5V power supply, the second end of switch tube Q1 is grounded through resistance R3, the second end of switch tube Q1 is connected with the input end of NOT gate U1, the output end of NOT gate U1 is connected with the first input end of NOT gate U6, the output end of NOT gate U6 is connected with the input end of NOT gate U2 through capacitor C1, the input end of NOT gate U2 is grounded through resistance R4, the output end of NOT gate U2 is connected with the second input end of NOT gate U2, the output end of NOT gate U6 is connected with the input end of NOT gate U6, and the output end of NOT gate U6 is connected with the first input end of master control unit.
Further, the utility model also comprises a voltage overrun detection circuit, wherein the voltage overrun detection circuit comprises a resistor R10, a rheostat RP1, an operational amplifier U8 and a resistor R12, the first end of the resistor R10 is connected with a 5V power supply, the second end of the resistor R10 is connected with the first end of the rheostat RP1, the second end of the rheostat RP1 is grounded, the sliding end of the rheostat RP1 is connected with the non-inverting input end of the operational amplifier U8, the inverting input end of the operational amplifier U8 is connected with a live wire, the output end of the operational amplifier U8 is connected with a 3.3V power supply through the resistor R12, and the output end of the operational amplifier U8 is connected with the second input end of the main control unit.
Further, the voltage overrun detecting circuit in the present utility model further includes a resistor R11, a varistor RP2, an operational amplifier U9, and a resistor R13, where a first end of the resistor R11 is connected to a 5V power supply, a second end of the resistor R11 is connected to a first end of the varistor RP1, a second end of the varistor RP2 is grounded, a sliding end of the varistor RP2 is connected to an inverting input end of the operational amplifier U9, a non-inverting input end of the operational amplifier U9 is connected to a live wire, an output end of the operational amplifier U9 is connected to 3.3V through the resistor R13, and an output end of the operational amplifier U9 is connected to a third input end of the main control unit.
Further, the utility model also comprises a voltage conditioning circuit, wherein the voltage conditioning circuit comprises a transformer T1, a diode D4 and a capacitor C9, a first input end of the transformer T1 is connected with a live wire, a second input end of the transformer T1 is connected with a zero line, a first output end of the transformer T1 is connected with an anode of the diode D4, a cathode of the diode D4 is grounded through the capacitor C9, a cathode of the diode D4 is connected with an inverting input end of the operational amplifier U8, and a cathode of the diode D4 is connected with a non-inverting input end of the operational amplifier U9.
Further, the utility model also comprises an alarm circuit, wherein the alarm circuit comprises an optocoupler U11, a resistor R19, a resistor R21, a resistor R20, a switching tube Q3 and an alarm B1, a first input end of the optocoupler U11 is connected with a first output end of the main control unit, a second input end of the optocoupler U11 is grounded, a first output end of the optocoupler U11 is connected with a 5V power supply through the resistor R19, a second input end of the optocoupler U11 is connected with a control end of the switching tube Q3 through the resistor R21, a first end of the switching tube Q3 is connected with the 5V power supply through the resistor R20, a second end of the switching tube Q3 is connected with a first end of the alarm B1, and a second end of the alarm B1 is grounded.
The working principle and the beneficial effects of the utility model are as follows:
in the utility model, the leakage detection circuit is used for judging whether the cable joint generates a leakage phenomenon or not, so that whether the cable joint has an insulation fault or not is judged, when a leakage signal occurs, the leakage detection circuit sends the leakage signal to the main control unit, and the main control unit sends the leakage signal to the communication terminal through the wireless communication unit to cause related staff.
The working principle of the electric leakage detection circuit is as follows: the inductor L1 is an induction coil and is used for detecting leakage signals, no leakage occurs when the cable joint is normal, no induction voltage exists on the inductor L1, the switching tube Q1 is cut off, and the NOT gate U3 outputs a high-level signal to a first input end of the main control unit; when the cable connector has insulation fault, electric leakage is generated, a pulse voltage signal is induced on the inductor L1, when the pulse voltage signal is high level, the control end of the switch tube Q1 is high level, the switch tube Q1 is conducted, a voltage signal is generated on the resistor R3, the input end of the NOT gate U1 is high level, the NOT gate U1 outputs low level, therefore, the NOT gate U6 outputs high level signals, the NOT gate U3 outputs low level signals to the first input end of the main control unit, wherein the capacitor C1 and the resistor R4 form a differential circuit, when the NOT gate U6 outputs high level signals, the high level signals can charge the capacitor C1, when the pulse voltage induced by the inductor L1 is low level, the switch tube Q1 is cut off, the NOT gate U1 outputs high level, when the capacitor C1 is charged, the input end of the NOT gate U2 is high level, the NOT gate U3 also outputs low level signals to the first input end of the main control unit, and when the capacitor C1 is discharged, the NOT gate U2 outputs high level signals to the first input end of the main control unit, therefore, the NOT gate U6 outputs high level signals to the first input end of the NOT gate U3. The differential circuit formed by the capacitor C1 and the resistor R4 can send the leakage signal to the main control unit in a pulse mode, and the NOT gate U2, the C1 and the resistor R4 form a feedback circuit, so that the leakage detection is more stable, the precision of the leakage detection is improved, and the problem of low precision of the cable joint insulation fault detection circuit in the related art is solved.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a circuit diagram of a leakage detection circuit according to the present utility model;
FIG. 2 is a circuit diagram of a voltage overrun detecting circuit according to the present utility model;
FIG. 3 is a circuit diagram of a voltage conditioning circuit according to the present utility model;
fig. 4 is a circuit diagram of the alarm circuit in the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides an intelligent low-voltage junction box, including a main control unit, leakage detection circuit and wireless communication unit, leakage detection circuit connects the main control unit, main control unit is connected with communication terminal communication by means of wireless communication unit, leakage detection circuit includes inductance L1, resistance R2, switch tube Q1, resistance R3, resistance R4, electric capacity C1, not gate U2, nand gate U6 and not gate U3, the first end of inductance L1 connects the first end of resistance R2, the second end of inductance L1 is grounded, the control end of switch tube Q1 is connected to the second end of resistance R2, the 5V power is connected to the first end of switch tube Q1, the second end of switch tube Q1 is grounded through resistance R3, the input end of not gate U1 is connected to the output end of not gate U1, the input end of not gate U6 is connected to the output end of not gate U6 through electric capacity C1, the input end of not gate U2 is connected to the input end of not gate U6 through the first end of resistance R4 ground, the output end of not gate U2 is connected to the second end of switch tube Q1.
When the cable joint has insulation fault, the electric leakage phenomenon can be generated, in the embodiment, whether the electric leakage phenomenon occurs to the cable joint is judged through the electric leakage detection circuit, so that whether the cable joint has insulation fault is judged, when an electric leakage signal occurs, the electric leakage detection circuit sends the electric leakage signal to the main control unit, and the main control unit sends the electric leakage signal to the communication terminal through the wireless communication unit to cause related staff.
Specifically, the operating principle of the leakage detection circuit is as follows: the inductor L1 is an induction coil and is used for detecting leakage signals, no leakage occurs when the cable joint is normal, no induction voltage exists on the inductor L1, the switching tube Q1 is cut off, and the NOT gate U3 outputs a high-level signal to a first input end of the main control unit; when the cable connector has insulation fault, electric leakage is generated, a pulse voltage signal is induced on the inductor L1, when the pulse voltage signal is high level, the control end of the switch tube Q1 is high level, the switch tube Q1 is conducted, a voltage signal is generated on the resistor R3, the input end of the NOT gate U1 is high level, the NOT gate U1 outputs low level, therefore, the NOT gate U6 outputs high level signals, the NOT gate U3 outputs low level signals to the first input end of the main control unit, wherein the capacitor C1 and the resistor R4 form a differential circuit, when the NOT gate U6 outputs high level signals, the high level signals can charge the capacitor C1, when the pulse voltage induced by the inductor L1 is low level, the switch tube Q1 is cut off, the NOT gate U1 outputs high level, when the capacitor C1 is charged, the input end of the NOT gate U2 is high level, the NOT gate U3 also outputs low level signals to the first input end of the main control unit, and when the capacitor C1 is discharged, the NOT gate U2 outputs high level signals to the first input end of the main control unit, therefore, the NOT gate U6 outputs high level signals to the first input end of the NOT gate U3. The differential circuit formed by the capacitor C1 and the resistor R4 can send the leakage signal to the main control unit in a pulse mode, and the NOT gate U2, the C1 and the resistor R4 form a feedback circuit, so that the leakage detection is more stable, and the leakage detection precision is improved.
In this embodiment, when no leakage signal occurs, the first input terminal of the main control unit receives a high-level signal, and when a leakage signal occurs, the first input terminal of the main control unit receives a pulse signal, and the main control unit determines whether an insulation fault exists in the cable connector according to the received signal.
As shown in fig. 2, the embodiment further includes a voltage overrun detecting circuit, where the voltage overrun detecting circuit includes a resistor R10, a varistor RP1, an operational amplifier U8, and a resistor R12, where a first end of the resistor R10 is connected to a 5V power supply, a second end of the resistor R10 is connected to a first end of the varistor RP1, a second end of the varistor RP1 is grounded, a sliding end of the varistor RP1 is connected to a non-inverting input end of the operational amplifier U8, an inverting input end of the operational amplifier U8 is connected to a live wire, an output end of the operational amplifier U8 is connected to a 3.3V power supply through the resistor R12, and an output end of the operational amplifier U8 is connected to a second input end of the main control unit.
The power grid voltage may have unstable condition in the working process, when the power grid voltage is overlarge, the output power of the electric equipment is increased, so that the heat of the electric equipment is serious, the experimental life of the electric equipment is influenced, the electric equipment is possibly damaged or fire disaster is caused, and the like, and therefore, overvoltage detection is required to be carried out on the power grid voltage.
The resistor R10 and the variable resistor RP1 form a voltage dividing circuit, the voltage of the sliding end of the rheostat RP1 is taken as a reference voltage and added to the non-inverting input end of the operational amplifier U8, the operational amplifier U8 forms a comparison circuit, the voltage of the inverting input end of the operational amplifier U8 is the voltage reduced by the voltage transformer T1, when the power grid voltage is normal, the voltage of the inverting input end of the operational amplifier U8 is lower than the voltage of the non-inverting input end of the operational amplifier U8, the operational amplifier U8 outputs a high-level signal to the second input end of the main control unit, when the power grid voltage exceeds a set value, the operational amplifier U8 outputs a low-level signal to the second input end of the main control unit, and the main control unit judges whether the power grid voltage exceeds the set value according to the signal received by the second input end.
As shown in fig. 2, the voltage overrun detecting circuit in this embodiment further includes a resistor R11, a varistor RP2, an operational amplifier U9, and a resistor R13, where a first end of the resistor R11 is connected to a 5V power supply, a second end of the resistor R11 is connected to a first end of the varistor RP1, a second end of the varistor RP2 is grounded, a sliding end of the varistor RP2 is connected to an inverting input end of the operational amplifier U9, a non-inverting input end of the operational amplifier U9 is connected to a live wire, an output end of the operational amplifier U9 is connected to 3.3V through the resistor R13, and an output end of the operational amplifier U9 is connected to a third input end of the main control unit.
When the power grid voltage is too low, the normal operation of the electric equipment can be influenced, and the resistor R11, the rheostat RP2, the operational amplifier U9 and the resistor R13 form an undervoltage detection circuit.
The resistor R11 and the variable resistor RP2 form a voltage dividing circuit, the voltage of the sliding end of the rheostat RP2 is taken as a reference voltage and added to the non-inverting input end of the operational amplifier U9, the operational amplifier U9 forms a comparison circuit, the voltage of the inverting input end of the operational amplifier U9 is the voltage reduced by the voltage transformer T1, when the power grid voltage is normal, the voltage of the inverting input end of the operational amplifier U9 is lower than the voltage of the non-inverting input end of the operational amplifier U8, the operational amplifier U8 outputs a high-level signal to the second input end of the main control unit, when the power grid voltage is lower than a set value, the operational amplifier U9 outputs a low-level signal to the third input end of the main control unit, and the main control unit judges whether the power grid voltage is lower than the set value according to the signal received by the third input end.
As shown in fig. 3, the embodiment further includes a voltage conditioning circuit, where the voltage conditioning circuit includes a transformer T1, a diode D4 and a capacitor C9, a first input end of the transformer T1 is connected to a live wire, a second input end of the transformer T1 is connected to a zero line, a first output end of the transformer T1 is connected to an anode of the diode D4, a cathode of the diode D4 is grounded through the capacitor C9, a cathode of the diode D4 is connected to an inverting input end of the op-amp U8, and a cathode of the diode D4 is connected to an non-inverting input end of the op-amp U9.
In this embodiment, a voltage conditioning circuit is arranged at a front stage of the voltage overrun detection circuit and is used for converting the ac high voltage of the power grid into a dc low voltage signal.
The transformer T1 is used for carrying out step-down processing on the alternating voltage of the power grid, the diode D4 and the capacitor C9 form a rectifying and filtering circuit, and alternating current signals are changed into direct current signals which are respectively sent to the inverting input end of the operational amplifier U8 and the non-inverting input end of the operational amplifier U9. The resistor R5 and the capacitor C2 form a low-pass filter circuit for filtering spike pulses in the direct current signal, so that the direct current signal is ensured to be more stable.
As shown in fig. 4, the embodiment further includes an alarm circuit, where the alarm circuit includes an optocoupler U11, a resistor R19, a resistor R21, a resistor R20, a switching tube Q3, and an alarm B1, where a first input end of the optocoupler U11 is connected to a first output end of the main control unit, a second input end of the optocoupler U11 is grounded, a first output end of the optocoupler U11 is connected to a 5V power supply through the resistor R19, a second input end of the optocoupler U11 is connected to a control end of the switching tube Q3 through the resistor R21, a first end of the switching tube Q3 is connected to the 5V power supply through the resistor R20, a second end of the switching tube Q3 is connected to a first end of the alarm B1, and a second end of the alarm B1 is grounded.
The alarm circuit in this embodiment is used for on-site alarm, and when intelligent low-voltage junction box detects cable leakage fault, grid voltage superpressure or undervoltage, the main control unit sends control command to alarm circuit, makes it send alarm signal.
Specifically, the working principle of the alarm circuit is as follows: when the cable has no electric leakage, the first output end of the main control unit outputs a low-level signal, the optocoupler U11 is cut off, the switching tube Q3 is also cut off, and the alarm B1 does not alarm; when the cable leaks electricity, the first output end of the main control unit outputs a high-level signal to the first input end of the optical coupler U11, the optical coupler U11 is conducted, the optical coupler U11 outputs the high-level signal, the switching tube Q3 is conducted, and the alarm B1 is powered on to sound, so that an alarm function is achieved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The intelligent low-voltage junction box is characterized by comprising a main control unit, a leakage detection circuit and a wireless communication unit, wherein the leakage detection circuit is connected with the main control unit, the main control unit is in communication connection with a communication terminal by means of the wireless communication unit, the leakage detection circuit comprises an inductor L1, a resistor R2, a switch tube Q1, a resistor R3, a resistor R4, a capacitor C1, a NOT gate U2, a NOT gate U6 and a NOT gate U3,
the first end of inductance L1 is connected with the first end of resistance R2, the second end of inductance L1 is grounded, the second end of resistance R2 is connected with the control end of switch tube Q1, the first end of switch tube Q1 is connected with a 5V power supply, the second end of switch tube Q1 is grounded through resistance R3, the second end of switch tube Q1 is connected with the input end of NOT gate U1, the output end of NOT gate U1 is connected with the first input end of NOT gate U6, the output end of NOT gate U6 is connected with the input end of NOT gate U2 through capacitor C1, the input end of NOT gate U2 is grounded through resistance R4, the output end of NOT gate U2 is connected with the second input end of NOT gate U2, the output end of NOT gate U6 is connected with the input end of NOT gate U6, and the output end of NOT gate U6 is connected with the first input end of master control unit.
2. The intelligent low-voltage junction box according to claim 1, further comprising a voltage overrun detection circuit, wherein the voltage overrun detection circuit comprises a resistor R10, a rheostat RP1, an operational amplifier U8 and a resistor R12, a first end of the resistor R10 is connected with a 5V power supply, a second end of the resistor R10 is connected with the first end of the rheostat RP1, a second end of the rheostat RP1 is grounded, a sliding end of the rheostat RP1 is connected with a non-inverting input end of the operational amplifier U8, an inverting input end of the operational amplifier U8 is connected with a live wire, an output end of the operational amplifier U8 is connected with a 3.3V power supply through the resistor R12, and an output end of the operational amplifier U8 is connected with a second input end of the main control unit.
3. The intelligent low-voltage junction box according to claim 2, wherein the voltage overrun detecting circuit further comprises a resistor R11, a rheostat RP2, an operational amplifier U9 and a resistor R13, a first end of the resistor R11 is connected with a 5V power supply, a second end of the resistor R11 is connected with a first end of the rheostat RP1, a second end of the rheostat RP2 is grounded, a sliding end of the rheostat RP2 is connected with an inverting input end of the operational amplifier U9, a non-inverting input end of the operational amplifier U9 is connected with a live wire, an output end of the operational amplifier U9 is connected with 3.3V through the resistor R13, and an output end of the operational amplifier U9 is connected with a third input end of the main control unit.
4. The intelligent low-voltage junction box according to claim 3, further comprising a voltage conditioning circuit, wherein the voltage conditioning circuit comprises a transformer T1, a diode D4 and a capacitor C9, a first input end of the transformer T1 is connected with a live wire, a second input end of the transformer T1 is connected with a zero line, a first output end of the transformer T1 is connected with an anode of the diode D4, a cathode of the diode D4 is grounded through the capacitor C9, a cathode of the diode D4 is connected with an inverting input end of the op-amp U8, and a cathode of the diode D4 is connected with a non-inverting input end of the op-amp U9.
5. The intelligent low-voltage junction box according to claim 1, further comprising an alarm circuit, wherein the alarm circuit comprises an optocoupler U11, a resistor R19, a resistor R21, a resistor R20, a switching tube Q3 and an alarm B1, a first input end of the optocoupler U11 is connected with a first output end of the main control unit, a second input end of the optocoupler U11 is grounded, a first output end of the optocoupler U11 is connected with a 5V power supply through the resistor R19, a second input end of the optocoupler U11 is connected with a control end of the switching tube Q3 through the resistor R21, a first end of the switching tube Q3 is connected with the 5V power supply through the resistor R20, a second end of the switching tube Q3 is connected with a first end of the alarm B1, and a second end of the alarm B1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903376.4U CN220271535U (en) | 2023-07-19 | 2023-07-19 | Intelligent low-voltage junction box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903376.4U CN220271535U (en) | 2023-07-19 | 2023-07-19 | Intelligent low-voltage junction box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220271535U true CN220271535U (en) | 2023-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321903376.4U Active CN220271535U (en) | 2023-07-19 | 2023-07-19 | Intelligent low-voltage junction box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220271535U (en) |
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2023
- 2023-07-19 CN CN202321903376.4U patent/CN220271535U/en active Active
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