CN110492266B - Non-contact electricity-checking integrated grounding wire clamp - Google Patents
Non-contact electricity-checking integrated grounding wire clamp Download PDFInfo
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- CN110492266B CN110492266B CN201910725489.1A CN201910725489A CN110492266B CN 110492266 B CN110492266 B CN 110492266B CN 201910725489 A CN201910725489 A CN 201910725489A CN 110492266 B CN110492266 B CN 110492266B
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- 230000005684 electric field Effects 0.000 claims abstract description 26
- 230000006698 induction Effects 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 104
- 230000005611 electricity Effects 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 7
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
- H01R11/14—End pieces terminating in an eye, hook, or fork the hook being adapted for hanging on overhead or other suspended lines, e.g. hot line clamp
Abstract
The invention discloses a non-contact electricity-checking integrated grounding wire clamp which comprises a grounding wire clamp body and a near-electricity induction device fixed on the grounding wire clamp body, wherein the near-electricity induction device comprises a power supply, an electric field inductor, a voltage follower circuit, a voltage doubling rectifying circuit, a high-power amplifying and filtering circuit, a comparison circuit and a warning circuit, one end of an inductance sensor is connected with the power supply, the other end of the inductance sensor is connected with the input end of the voltage follower circuit, the output end of the voltage follower circuit is connected with the input end of the voltage doubling rectifying circuit, the output end of the voltage doubling rectifying circuit is connected with the input end of the high-power amplifying and filtering circuit, the output end of the high-power amplifying and filtering circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the input end of the warning circuit. The invention is not convenient to install and improves the use safety of the grounding wire clamp.
Description
Technical Field
The invention relates to the field of grounding clamps, in particular to a non-contact electricity testing integrated grounding clamp.
Background
The current grounding wire clamp mainly comprises a reinforced shell, a puncture blade, a sealing gasket, waterproof silicone grease, a high-strength bolt, a torque nut and a cable terminal cap sleeve. When the cable is required to be branched or connected, the terminal of the branch line of the cable is inserted into the waterproof terminal cap sleeve, after the branch position of the main line is determined, the torque array nut on the wire clamp is screwed by the socket wrench, the contact blade can puncture the cable insulating layer in the process and is contacted with the conductor, the sealing gasket ring presses the periphery of the punctured position of the cable, silicone grease in the shell overflows, when the torque reaches a set value, the nut torque mechanism drops, the main line and the branch line are connected, and the waterproof performance and the electrical effect reach parameters required by standards.
However, the conventional operation rules of power failure, electricity inspection and grounding wire hanging are that an electroscope with corresponding voltage level and qualification is used during electricity inspection, and each phase is respectively inspected at two sides of power failure equipment and a position needing short circuit grounding. Before electricity test, the test should be performed on the electrified equipment to confirm that the electroscope is good. When the equipment is verified to be voltage-free, the maintenance equipment should be grounded and three-phase short-circuited immediately. If the two processes of electricity checking and ground wire hanging operation of the ground wire clamp cannot be performed synchronously, certain potential safety hazards can be brought, for example: when the electricity checking step is carried out, the tested object is not electrified, but in the period of several minutes from electricity checking to grounding wire hanging, if temporary reverse electricity transmission occurs, serious malignant misoperation of 'electrified grounding wire hanging' can be caused; often, the vicious illegal operation of directly hanging the grounding wire without electricity verification can also happen due to the reasons that the workers are convenient in greedy drawing or the electroscope is not carried to the site.
Disclosure of Invention
The invention provides a non-contact electricity-testing integrated grounding wire clamp for overcoming at least one defect (deficiency) in the prior art.
The present invention aims to solve the above technical problems at least to some extent.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
the utility model provides a non-contact electricity testing integral type ground clamp, including the ground clamp body and be fixed in the nearly electric induction system of ground clamp body, wherein nearly electric induction system includes the power, electric field inductor, voltage follower circuit, voltage doubling rectifier circuit, high-power amplification filter circuit, comparator circuit and warning circuit, the power is connected to inductance sensor's one end, its other end is connected with voltage follower circuit's input, voltage follower circuit's output is connected with voltage doubling rectifier circuit's input, voltage doubling rectifier circuit's output is connected with high-power amplification filter circuit's input, high-power amplification filter circuit's output is connected with comparator circuit's input, comparator circuit's output is connected with warning circuit's input.
Preferably, the voltage follower circuit includes a capacitor C1, an inductor L1, a capacitor C4, a capacitor C10, a capacitor C11, an operational amplifier U1A, an operational amplifier U1B, a resistor R1, a resistor R18, a resistor R19, a resistor R20, and a resistor R21, wherein the electric field inductor is connected to the connection terminals of the inductors L1 and C4 through the capacitor C1, the other ends of the inductors L1 and C4 are respectively grounded, the input terminal of the resistor R18 is connected to the connection terminals of the inductors L1 and C4, the output terminal of the resistor R18 is connected to the 5 pin of the operational amplifier U1, the 5 pin of the operational amplifier U1B is also connected to the input terminal of the resistor R19, the output terminal of the resistor R19 is connected to the 1 pin and the 2 pin of the operational amplifier U1A, the resistor R20 and the resistor R21 are connected in series, the input terminal of the resistor R20 is connected to the power supply, the output terminal of the resistor R21 is grounded, the connection terminals of the resistor R20 and the resistor R21 are connected to the 3 pin of the operational amplifier U1A, the other ends of the resistor R1 are connected to the 6 pin and 7 pin of the operational amplifier U1B, the other end of the resistor R1 is the output terminal of the voltage follower circuit is VCC 1, the output terminal of the resistor U1A 4 is connected to the resistor C8, and the other end of the resistor is connected to the resistor C8 is connected to the resistor C4 is connected to the power supply, and the output pin of the resistor is connected to the resistor C11 is connected to the power supply.
Preferably, the voltage doubling rectifying circuit includes a capacitor C2, C3, C5, C6, a diode D1, D2, D3, and D4, one end of the capacitor C2 is connected to an output end of the voltage follower circuit, the other end of the capacitor C2 is connected to a cathode of the diode D1, an anode of the diode D2, and one end of the capacitor C3, an anode of the diode D1 is connected to one end of the capacitor C5, the other end of the capacitor C5 is connected to a cathode of the diode D2, one end of the capacitor C3 is connected to a cathode of the diode D2, the other end of the capacitor C3 is connected to an anode of the diode D3, and the other end of the capacitor C6 is connected to an anode of the diode D4 and serves as an output end v1+ of the voltage doubling rectifying circuit.
Preferably, the high-power amplifying filter circuit includes resistors R2, R4, R5, R7, R8, R12, R17, capacitors C7, C9, C16, C17, an operational amplifier U2A, and an operational amplifier U2B, the output terminal of the resistor R4 is grounded, the input terminal thereof is connected to the 6 pin of the operational amplifier U2B, one end of the resistor R7 is connected to the output v1+ of the voltage-multiplying rectifier circuit, the other end thereof is connected to the input terminal of the resistor R8, one end of the capacitor C8, pin 5 of the operational amplifier U2B, the output terminal of the resistor R8, the other end of the capacitor C8 is connected to pin 1 of the operational amplifier U2A, the output terminal of the resistor R8 is also connected to pin 2 of the operational amplifier U2A, the input terminal of the resistor R12 is connected to the power supply VCC, the output terminal of the resistor R17 is grounded, the output terminal of the resistor R12 and the input terminal of the resistor R17 is connected to pin 3 of the operational amplifier U2A, one end of the resistor R2 is connected to the capacitor C7, the other end thereof is connected to the other end of the capacitor C7B 6B and the other end thereof is connected to the other end of the capacitor C9 of the capacitor C2B, and the other end thereof is connected to the other end of the capacitor C9 is connected to the other end of the capacitor B2B, and the other end thereof is connected to the pin 9 is connected to the other end of the capacitor is connected to the pin 2B.
Preferably, the comparing circuit includes resistors R3, R11, R6, capacitors C18, C19, C20, C21, a comparator U3, and a hysteresis inverter U4, wherein pin 3 of the comparator U3, resistor R3, and one end of resistor R11 are connected, the other end of resistor R3 is connected to a power VCC, the other end of resistor R11 is grounded, pin 4 of the comparator U3 is grounded, pin 8 of the comparator U3 is connected to the power VCC, capacitors C18, C19 are connected in parallel, one end of the parallel connection is connected to pin 8 of the comparator U3, the other end of the parallel connection is connected to pin 4 of the comparator U3, one end of resistor R6 is connected to pin 8 of the comparator U3, the other end of the parallel connection is respectively connected to pin 1 of the comparator U3 and pin 1 of the hysteresis inverter, pin 7 of the hysteresis inverter is grounded, and pin 2 of the hysteresis inverter serves as output Alarm of the comparing circuit.
Preferably, the warning circuit includes resistors R9, R10, R13, R14, R15, R16, MOS transistors Q1, Q2, a light emitting diode D5, a buzzer LS1, a capacitor C12, C13, C14, and C15, one end of the resistor R13 is connected to the output Alarm of the comparison circuit, the other end thereof is connected to one end of the capacitor C14, one end of the resistor R15 and the gate of the MOS transistor Q1, the other end of the capacitor C14 and the other end of the resistor R15 are grounded to the source of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to the power VCC, one end of the resistor R14 is connected to the output Alarm of the comparison circuit, the other end thereof is connected to one end of the capacitor C15 and the gate of the MOS transistor Q2, the other end of the capacitor C15, the other end of the resistor R16 and the source of the MOS transistor Q2 are grounded, one end of the drain of the MOS transistor Q2 is connected to the other end of the buzzer LS1 and the other end of the resistor R10 is connected to the output Alarm of the resistor R10, the other end of the resistor is connected to the other end of the capacitor is connected in parallel to the power VCC, and the other end of the resistor is connected to the other end of the resistor is connected in parallel.
Preferably, the electric field sensor is an alternating electric field sensor.
Preferably, the output range of the high-power amplifying filter circuit voltage is 0-1.5V.
Preferably, the threshold value of the comparator U3 is 1.5V.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention is characterized in that a near-electric induction device applied to a grounding wire clamp is formed by connecting a power supply, an electric field sensor, a voltage follower circuit, a voltage doubling rectifying circuit, a high-power amplifying filter circuit, a comparison circuit and a warning circuit, wherein the electric field sensor senses surrounding electric field signals, amplifies the required electric field signals through a resonance circuit, sends the electric field signals into the follower circuit, doubles weak alternating current signals through the voltage doubling rectifying circuit, inputs the obtained voltage signals into the high-power amplifying filter circuit, filters high-frequency interference parts, amplifies low-frequency direct current parts to an output range of 0-1.5V, inputs the low-frequency direct current parts into the comparison circuit, compares the direct current signals with a threshold value of 1.5V of a comparator U3, outputs two signals of electricity and no electricity according to the size of the direct current signals, and when the direct current signals are in the electricity, the comparator outputs a low level, the comparator outputs a high level when the electricity is not, and the comparator reverses through a hysteresis inverter to drive a MOSFET tube to send sound and light warning signals. Therefore, under the condition that the grounding wire clamp is not directly contacted with the high-voltage belt equipment, whether the high-voltage line is electrified or not can be checked by utilizing an electric field near the high-voltage line, and warning is sent out through the warning circuit.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage follower circuit and a voltage doubler rectifier circuit of the present invention;
FIG. 3 is a circuit diagram of a high-power amplifying filter circuit and a comparator circuit of the present invention;
fig. 4 is a circuit diagram of the warning circuit of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
As shown in figures 1-4, the non-contact electricity testing integrated grounding wire clamp comprises a grounding wire clamp body and a near-electricity induction device fixed on the grounding wire clamp body, wherein the near-electricity induction device comprises a power supply, an electric field inductor, a voltage follower circuit, a voltage doubling rectifying circuit, a high-power amplifying filtering circuit, a comparison circuit and a warning circuit, one end of an inductance sensor is connected with the power supply, the other end of the inductance sensor is connected with the input end of the voltage follower circuit, the output end of the voltage follower circuit is connected with the input end of the voltage doubling rectifying circuit, the output end of the voltage doubling rectifying circuit is connected with the input end of the high-power amplifying filtering circuit, the output end of the high-power amplifying filtering circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the input end of the warning circuit.
In the embodiment of the invention, as shown in fig. 1, an electric field induction sensor senses a surrounding electric field signal and converts the surrounding electric field signal into an alternating voltage signal, the alternating voltage signal is sent into a voltage follower circuit to be forward biased and filtered, the weak alternating voltage signal is subjected to voltage doubling rectification into a direct voltage signal through a voltage doubling rectifying circuit, the direct voltage signal is input into a high-power amplifying and filtering circuit to filter out a high-frequency interference part, a low-frequency direct current part is amplified and then is input into a comparison circuit, the direct current signal is compared with a threshold value of a comparator U3, and when the direct current signal is in power, the comparator outputs a low level, when the direct current signal is in power, the comparator outputs a high level, and the comparator is reversed through a hysteresis inverter to drive a MOSFET to send out sound and light warning. Thus, the ground wire clamp can perform field recognition on whether the live cable is in a live state or not without contacting the live cable or stopping the operation of the live cable.
Preferably, the voltage follower circuit includes a capacitor C1, an inductor L1, a capacitor C4, a capacitor C10, a capacitor C11, an operational amplifier U1A, an operational amplifier U1B, a resistor R1, a resistor R18, a resistor R19, a resistor R20, and a resistor R21, wherein the electric field inductor is connected to the connection terminals of the inductors L1 and C4 through the capacitor C1, the other ends of the inductors L1 and C4 are respectively grounded, the input terminal of the resistor R18 is connected to the connection terminals of the inductors L1 and C4, the output terminal of the resistor R18 is connected to the 5 pin of the operational amplifier U1, the 5 pin of the operational amplifier U1B is also connected to the input terminal of the resistor R19, the output terminal of the resistor R19 is connected to the 1 pin and the 2 pin of the operational amplifier U1A, the resistor R20 and the resistor R21 are connected in series, the input terminal of the resistor R20 is connected to the power supply, the output terminal of the resistor R21 is grounded, the connection terminals of the resistor R20 and the resistor R21 are connected to the 3 pin of the operational amplifier U1A, the other ends of the resistor R1 are connected to the 6 pin and 7 pin of the operational amplifier U1B, the other end of the resistor R1 is the output terminal of the voltage follower circuit is VCC 1, the output terminal of the resistor U1A 4 is connected to the resistor C8, and the other end of the resistor is connected to the resistor C8 is connected to the resistor C4 is connected to the power supply, and the output pin of the resistor is connected to the resistor C11 is connected to the power supply.
In the embodiment of the present invention, as shown in fig. 2, in an embodiment of a specific connection structure of the voltage follower circuit of the present invention, an electric field sensor is denoted by E1, and is connected to inductors L1 and C4 through a capacitor C1, so that the frequency of an electric field signal of 50HZ is effectively selected through a resonance mode, and then an output ac voltage signal is sent to an operational amplifier U1. Two ends of R19 are respectively connected to pins of the operational amplifiers U1A and U1B to form an addition circuit for raising the input alternating voltage signal.
Preferably, the voltage doubling rectifying circuit includes a capacitor C2, C3, C5, C6, a diode D1, D2, D3, and D4, one end of the capacitor C2 is connected to an output end of the voltage follower circuit, the other end of the capacitor C2 is connected to a cathode of the diode D1, an anode of the diode D2, and one end of the capacitor C3, an anode of the diode D1 is connected to one end of the capacitor C5, the other end of the capacitor C5 is connected to a cathode of the diode D2, one end of the capacitor C3 is connected to a cathode of the diode D2, the other end of the capacitor C3 is connected to an anode of the diode D3, and the other end of the capacitor C6 is connected to an anode of the diode D4 and serves as an output end v1+ of the voltage doubling rectifying circuit.
In the embodiment of the present invention, as shown in fig. 2, in an embodiment of a specific connection structure of the voltage doubler rectifying circuit of the present invention, the diodes D1, D2, D3 and D4 form a 4-voltage doubler rectifying circuit through the capacitors C2, C3, C5 and C6.
Preferably, the high-power amplifying filter circuit includes resistors R2, R4, R5, R7, R8, R12, R17, capacitors C7, C9, C16, C17, an operational amplifier U2A, and an operational amplifier U2B, the output terminal of the resistor R4 is grounded, the input terminal thereof is connected to the 6 pin of the operational amplifier U2B, one end of the resistor R7 is connected to the output v1+ of the voltage-multiplying rectifier circuit, the other end thereof is connected to the input terminal of the resistor R8, one end of the capacitor C8, pin 5 of the operational amplifier U2B, the output terminal of the resistor R8, the other end of the capacitor C8 is connected to pin 1 of the operational amplifier U2A, the output terminal of the resistor R8 is also connected to pin 2 of the operational amplifier U2A, the input terminal of the resistor R12 is connected to the power supply VCC, the output terminal of the resistor R17 is grounded, the output terminal of the resistor R12 and the input terminal of the resistor R17 is connected to pin 3 of the operational amplifier U2A, one end of the resistor R2 is connected to the capacitor C7, the other end thereof is connected to the other end of the capacitor C7B 6B and the other end thereof is connected to the other end of the capacitor C9 of the capacitor C2B, and the other end thereof is connected to the other end of the capacitor C9 is connected to the other end of the capacitor B2B, and the other end thereof is connected to the pin 9 is connected to the other end of the capacitor is connected to the pin 2B.
In the embodiment of the present invention, as shown in fig. 3, in an embodiment of a specific connection structure of the high-power amplification filter circuit, the high-frequency interference part is filtered by the high-power amplification filter circuit, and the low-frequency direct current part is amplified and input into the comparison circuit.
Preferably, the comparing circuit includes resistors R3, R11, R6, capacitors C18, C19, C20, C21, a comparator U3, and a hysteresis inverter U4, wherein pin 3 of the comparator U3, resistor R3, and one end of resistor R11 are connected, the other end of resistor R3 is connected to a power VCC, the other end of resistor R11 is grounded, pin 4 of the comparator U3 is grounded, pin 8 of the comparator U3 is connected to the power VCC, capacitors C18, C19 are connected in parallel, one end of the parallel connection is connected to pin 8 of the comparator U3, the other end of the parallel connection is connected to pin 4 of the comparator U3, one end of resistor R6 is connected to pin 8 of the comparator U3, the other end of the parallel connection is respectively connected to pin 1 of the comparator U3 and pin 1 of the hysteresis inverter, pin 7 of the hysteresis inverter is grounded, and pin 2 of the hysteresis inverter serves as output Alarm of the comparing circuit.
In the embodiment of the present invention, as shown in fig. 3, in an embodiment of a specific connection structure of the comparison circuit, the comparison circuit determines whether the dc signal is powered or not by comparing the output range of the low-frequency dc signal with the threshold value of the comparator U3, and outputs a powered or non-powered determination signal, if powered, the comparator outputs a low level, and if not, the comparator outputs a high voltage, and the comparator reverses through the hysteresis inverter.
Preferably, the warning circuit includes resistors R9, R10, R13, R14, R15, R16, MOS transistors Q1, Q2, a light emitting diode D5, a buzzer LS1, a capacitor C12, C13, C14, and C15, one end of the resistor R13 is connected to the output Alarm of the comparison circuit, the other end thereof is connected to one end of the capacitor C14, one end of the resistor R15 and the gate of the MOS transistor Q1, the other end of the capacitor C14 and the other end of the resistor R15 are grounded to the source of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to the power VCC, one end of the resistor R14 is connected to the output Alarm of the comparison circuit, the other end thereof is connected to one end of the capacitor C15 and the gate of the MOS transistor Q2, the other end of the capacitor C15, the other end of the resistor R16 and the source of the MOS transistor Q2 are grounded, one end of the drain of the MOS transistor Q2 is connected to the other end of the buzzer LS1 and the other end of the resistor R10 is connected to the output Alarm of the resistor R10, the other end of the resistor is connected to the other end of the capacitor is connected in parallel to the power VCC, and the other end of the resistor is connected to the other end of the resistor is connected in parallel.
In the embodiment of the present invention, as shown in fig. 4, in an embodiment of a specific connection structure of the warning circuit of the present invention, the warning circuit outputs a corresponding warning signal through the MOS tube according to the output high-low level with or without power.
Preferably, the electric field sensor is an alternating electric field sensor.
Preferably, the output range of the high-power amplifying filter circuit voltage is 0-1.5V.
Preferably, the threshold value of the comparator U3 is 1.5V.
The same or similar reference numerals correspond to the same or similar components;
the positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent;
it is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (1)
1. The non-contact electricity testing integrated grounding wire clamp is characterized by comprising a grounding wire clamp body and a near-electricity induction device fixed on the grounding wire clamp body, wherein the near-electricity induction device comprises a power supply, an electric field induction sensor, a voltage follower circuit, a voltage doubling rectifying circuit, a high-power amplifying filter circuit, a comparison circuit and a warning circuit, one end of the electric field induction sensor is connected with the power supply, the other end of the electric field induction sensor is connected with the input end of the voltage follower circuit, the output end of the voltage follower circuit is connected with the input end of the voltage doubling rectifying circuit, the output end of the voltage doubling rectifying circuit is connected with the input end of the high-power amplifying filter circuit, the output end of the high-power amplifying filter circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the input end of the warning circuit;
the voltage follower circuit comprises a capacitor C1, an inductor L1, a capacitor C4, capacitors C10 and C11, an operational amplifier U1A, an operational amplifier U1B, resistors R1, R18, R19, R20 and R21, wherein an electric field induction sensor is connected with the connecting ends of the inductor L1 and the capacitor C4 through the capacitor C1, the other ends of the inductor L1 and the capacitor C4 are respectively grounded, the input end of the R18 is connected with the connecting ends of the inductor L1 and the capacitor C4, the output end of the R18 is connected with the pin 5 of the operational amplifier U1B, the pin 5 of the operational amplifier U1B is also connected with the input end of a resistor R19, the output end of the R19 is connected with the pin 1 and the pin 2 of the operational amplifier U1A, the resistors R20 and R21 are connected in series, the input end of the resistor R20 is connected with a power supply, the output end of the resistor R21 is grounded, the connecting ends of the resistor R20 and the R21 are connected with the pin 3 of the operational amplifier U1A, one end of the pin 6 and the pin 7 of the operational amplifier U1B, the other end of the R1 is the output end of the voltage follower circuit U1A is connected with the pin 4, and the other end of the voltage follower circuit U1 is connected with the pin 8 of the voltage follower circuit C1A is connected with the pin 8, and the output end of the voltage follower circuit is connected with the voltage follower circuit C11 is connected with the pin 8 is connected with the power supply 7 in parallel;
the voltage doubling rectifying circuit comprises capacitors C2, C3, C5, C6, diodes D1, D2, D3 and D4, one end of the capacitor C2 is connected with the output end of the voltage follower circuit, the other end of the capacitor C2 is connected with the cathode of the diode D1, the anode of the diode D2 and one end of the capacitor C3, the anode of the diode D1 is connected with one end of the capacitor C5, the other end of the C5 is connected with the cathode of the diode D2, one end of the capacitor C3 is connected with the cathode of the diode D3, the other end of the capacitor C3 is connected with the cathode of the diode D3, and the other end of the capacitor C6 is connected with the anode of the diode D4 and serves as an output end V1 < + > of the voltage doubling rectifying circuit;
the high-power amplification filter circuit comprises resistors R2, R4, R5, R7, R8, R12, R17, capacitors C7, C9, C16, C17, an operational amplifier U2A and an operational amplifier U2B, wherein the output end of the resistor R4 is grounded, the input end of the resistor R4 is connected with the 6 pin of the operational amplifier U2B, one end of the resistor R7 is connected with the output end V1 < + >, the other end of the resistor R7 is connected with the input end of the resistor R8, one end of the capacitor C8 and the 5 pin of the operational amplifier U2B, the output end of the resistor R8 and the other end of the capacitor C8 are connected with the 1 pin of the operational amplifier U2A, the output end of the resistor R8 is also connected with the 2 pin of the operational amplifier U2A, the output end of the resistor R12 is connected with the power supply, the output end of the resistor R17 is grounded, the output end of the resistor R12 and the input end of the resistor R17 is connected with the 3 pin of the operational amplifier U2A, one end of the resistor R2 is connected with the capacitor C7, one end of the resistor R2 is connected with the other end of the capacitor C7B, the other end of the capacitor C8 is connected with the other end of the capacitor C9B, and the other end of the capacitor C8 is connected with the other end of the capacitor C2B is connected with the other end of the capacitor C9B, and the capacitor C2B is connected with the other end of the capacitor C2B, and the other end of the capacitor is connected with the other end of the capacitor is connected with the capacitor 2B is connected with the 3;
the comparison circuit comprises resistors R3, R11 and R6, capacitors C18, C19, C20 and C21, a comparator U3 and a hysteresis inverter U4, wherein the 3 pin of the comparator U3 is connected with one end of the resistor R3 and one end of the resistor R11, the other end of the resistor R3 is connected with a power supply VCC, the other end of the resistor R11 is grounded, the 4 pin of the comparator U3 is grounded, the 8 pin of the comparator U3 is connected with the power supply VCC, the capacitors C18 and C19 are connected in parallel, one end of the capacitor C18 and C19 which are connected in parallel is connected with the 8 pin of the comparator U3, the other end of the capacitor C18 and C19 which are connected in parallel is connected with the 4 pin of the comparator U3, one end of the resistor R6 is connected with the 8 pin of the comparator U3, the other end of the resistor R6 is respectively connected with the 1 pin of the comparator U3 and the 1 pin of the hysteresis inverter U4, the 7 pin of the hysteresis inverter U4 is grounded, and the 2 pin of the hysteresis inverter U4 is used as an output Alarm of the comparison circuit;
the warning circuit comprises resistors R9, R10, R13, R14, R15, R16, a MOS tube Q1 and a MOS tube Q2, a light emitting diode D5, a buzzer LS1, capacitors C12, C13, C14 and C15, wherein one end of the resistor R13 is connected with the output Alarm of the comparison circuit, the other end of the resistor R13 is connected with one end of the capacitor C14, one end of the resistor R15 and the gate of the MOS tube Q1, the other end of the capacitor C14 and the other end of the resistor R15 are grounded, the drain electrode of the MOS tube Q1 is connected with the cathode of a diode D5, the anode of the diode D5 is connected with one end of a resistor R9, the other end of the resistor R9 is connected with a power supply VCC, one end of the resistor R14 is connected with the output Alarm of the comparison circuit, one end of the resistor R16 is connected with the gate of the MOS tube Q2, the other end of the capacitor C15, the other end of the resistor R16 is grounded, one end of the drain electrode of the MOS tube Q2 is connected with one end of a drain electrode connector LS1 of the resistor LS1, the other end of the buzzer LS1 is connected with the resistor R10, the other end of the resistor R10 is connected with VCC 10 in parallel, and the other end of the resistor is connected with VCC 10 in parallel or the other end of the resistor is connected with VCC 10 in parallel;
the electric field induction sensor senses surrounding electric field signals and converts the signals into alternating voltage signals, the alternating voltage signals are sent into a voltage follower circuit to be forward biased and filtered, the alternating voltage signals are subjected to voltage doubling rectification into direct voltage signals through a voltage doubling rectifying circuit, the direct voltage signals are input into a high-power amplifying and filtering circuit to filter high-frequency interference parts, the low-frequency direct current parts are amplified and then input into a comparison circuit, the direct current signals are compared with a threshold value of a comparator U3, two signals of power-on and power-off are output according to the size of the direct current signals, when the power-on is on, the comparator outputs low level, when the power-off is off, the comparator outputs high level, and then the voltage is reversed through a hysteresis reverser to drive a MOS tube to send out sound and light warning; the ground wire clamp can recognize whether the electrified cable is in an electrified state on site without contacting the electrified cable; the voltage doubling rectifying circuit is a 4-voltage doubling rectifying circuit;
the output range of the voltage of the high-power amplifying and filtering circuit is 0-1.5V; the threshold value of the comparator U3 is 1.5V.
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