CN213633622U - Ground resistance detector - Google Patents
Ground resistance detector Download PDFInfo
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- CN213633622U CN213633622U CN202022279607.1U CN202022279607U CN213633622U CN 213633622 U CN213633622 U CN 213633622U CN 202022279607 U CN202022279607 U CN 202022279607U CN 213633622 U CN213633622 U CN 213633622U
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Abstract
The utility model discloses a ground resistance detector, produce module, first coil, second coil and band-pass filtering module including control module, wave form. The band-pass filtering module comprises a low-pass filtering circuit and a high-pass filtering circuit which are electrically connected in sequence, the input end of the low-pass filtering circuit is electrically connected with the second coil, and the output end of the high-pass filtering circuit is electrically connected with the control module. The utility model discloses ground resistance detector, through electromagnetic induction's mode, can be quick obtain corresponding to ground resistance's the signal of telecommunication to obtain the ground resistance value of earth connection through the corresponding relation of this signal of telecommunication and resistance value, detection efficiency is high, not with surveyed the earth connection contact, does not influence the lightning protection effect of equipment.
Description
Technical Field
The utility model relates to a detect technical field, in particular to ground resistance detector.
Background
The industrial development promotes various large-scale electrical equipment to be increased continuously, in order to maintain the safe and reliable operation of the lightning protection system and ensure the safety of operators of the electrical equipment, a safe and reliable grounding system is needed, the quality of the grounding system has great influence on whether the electrical equipment works normally and whether the operators work safely, and the size of the grounding resistance is one of the main criteria for judging whether the grounding system is qualified or not. The traditional ground resistance measurement method is to disconnect the ground wire from the power equipment and use a megger method to measure, and has the disadvantages of low measurement efficiency, complex test process and low measurement precision.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an earth resistance detector can improve earth resistance detection efficiency.
According to the utility model discloses a ground resistance detector, include: a control module; the waveform generation module is electrically connected with the output end of the control module; the first coil is electrically connected with the output end of the waveform generation module; a second coil; the band-pass filtering module comprises a low-pass filtering circuit and a high-pass filtering circuit which are electrically connected in sequence, the input end of the low-pass filtering circuit is electrically connected with the second coil, and the output end of the high-pass filtering circuit is electrically connected with the control module.
According to the utility model discloses ground resistance detector has following beneficial effect at least: the ground wire of the grounding system simultaneously penetrates through the first coil and the second coil, the ground wire is not in contact with the first coil and the second coil, the control module outputs signals to the waveform generation module, the waveform generation module generates detection waveform signals accordingly, the detection waveform signals act on the first coil, the first coil generates a first magnetic field, the ground wire generates a second magnetic field under the action of the first magnetic field, the second coil generates coupling electric signals under the action of the second magnetic field generated by the ground wire, the coupling electric signals are filtered by the low-pass filter circuit to remove high-frequency signals, the coupling electric signals are filtered by the high-pass filter circuit to remove low-frequency signals and then are output to the control module, and the control module can calculate the grounding resistance of the ground wire according to the. The ground resistance detector provided by the embodiment of the utility model can rapidly obtain the electric signal corresponding to the ground resistance in an electromagnetic induction mode, and can obtain the ground resistance value of the ground wire through the corresponding relation between the electric signal and the resistance value, so that the detection efficiency is high; moreover, the high-frequency signal and the low-frequency signal can be filtered through the low-pass filtering module and the high-pass filtering module, so that an electric signal with the same frequency as the detected waveform signal is obtained, the influence of interference signals on a measurement result is prevented, and the measurement precision is improved.
According to the utility model discloses a some embodiments still include the signal stabilization module, the input of signal stabilization module with the wave form produces module electric connection, the output of signal stabilization module with first coil electric connection.
According to some embodiments of the invention, the signal stabilization module comprises a constant voltage amplification circuit and/or a constant current amplification circuit.
According to the utility model discloses a some embodiments still include the signal amplification module, signal amplification module electric connection in the second coil with between the low pass filter circuit.
According to the utility model discloses a some embodiments still include rectifier module, rectifier module electric connection in high pass filter circuit with between the control module.
According to some embodiments of the invention, the rectifier module comprises: a resistor R14, wherein a first end of the resistor R14 is electrically connected with an output end of the high-pass filter circuit; an inverting input end of the operational amplifier U4 is electrically connected with a second end of the resistor R14, and a non-inverting input end of the operational amplifier U4 is grounded; a diode D1, wherein a cathode of the diode D1 is electrically connected to an inverting input terminal of the operational amplifier U4, and an anode of the diode D1 is electrically connected to an output terminal of the operational amplifier U4; a resistor R15, wherein a first end of the resistor R15 is electrically connected with a second end of the resistor R14; a diode D2, a cathode of the diode D2 being electrically connected to the output terminal of the operational amplifier U4, and an anode of the diode D2 being electrically connected to the second terminal of the resistor R15; a resistor R16, wherein a first end of the resistor R16 is electrically connected with a second end of the resistor R15; a resistor R18, a first end of the resistor R18 being electrically connected to a first end of the resistor R14, a second end of the resistor R18 being electrically connected to a second end of the resistor R16; an inverting input end of the operational amplifier U5 is electrically connected to the second end of the resistor R16, a non-inverting input end of the operational amplifier U5 is grounded, and an output end of the operational amplifier U5 is electrically connected to the control module; a resistor R17, a first terminal of the resistor R17 is electrically connected to the inverting input terminal of the operational amplifier U5, and a second terminal of the resistor R17 is electrically connected to the output terminal of the operational amplifier U5.
According to some embodiments of the invention, the low pass filter circuit comprises: a resistor R1, wherein a first end of the resistor R1 is an input end of the low-pass filter circuit; a resistor R3, a first end of the resistor R3 is electrically connected with a second end of the resistor R1, and a second end of the resistor R3 is grounded; a resistor R2, wherein a first end of the resistor R2 is electrically connected with a second end of the resistor R1; an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is electrically connected to the second terminal of the resistor R2, and an output terminal of the operational amplifier U1 is electrically connected to the input terminal of the high-pass filter circuit; a capacitor C1, wherein a first terminal of the capacitor C1 is electrically connected to a second terminal of the resistor R2, and a second terminal of the capacitor C1 is grounded; a capacitor C2, wherein a first terminal of the capacitor C2 is electrically connected to a second terminal of the resistor R1, and a second terminal of the capacitor C2 is electrically connected to an output terminal of the operational amplifier U1; a resistor R4, wherein a first end of the resistor R4 is electrically connected with an inverting input end of the operational amplifier U1, and a second end of the resistor R4 is grounded; a resistor R5, a first terminal of the resistor R5 is electrically connected to the inverting input terminal of the operational amplifier U1, and a second terminal of the resistor R5 is electrically connected to the output terminal of the operational amplifier U1.
According to some embodiments of the invention, the high pass filter circuit comprises: a capacitor C3, wherein a first end of the capacitor C3 is electrically connected with an output end of the low-pass filter circuit; a capacitor C4, wherein a first end of the capacitor C4 is electrically connected to a second end of the capacitor C3; a resistor R6, wherein a first end of the resistor R6 is electrically connected to a second end of the capacitor C4, and a second end of the resistor R6 is grounded; an operational amplifier U2, wherein a non-inverting input terminal of the operational amplifier U2 is electrically connected to the second terminal of the capacitor C4, and an output terminal of the operational amplifier U2 is an output terminal of the high-pass filter circuit; a resistor R7, a first end of the resistor R7 being electrically connected to a second end of the capacitor C3, a second end of the resistor R7 being electrically connected to the output of the operational amplifier U2; a resistor R9, wherein a first end of the resistor R9 is electrically connected with an inverting input end of the operational amplifier U2, and a second end of the resistor R9 is grounded; a resistor R8, a first end of the resistor R8 is electrically connected to a first end of the resistor R9, and a second end of the resistor R8 is electrically connected to an output terminal of the operational amplifier U2.
According to some embodiments of the present invention, the control module is connected to the terminal device in a wired and/or wireless manner.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic block diagram of a ground resistance detector according to a first embodiment of the present invention;
fig. 2 is a schematic block diagram of a ground resistance detector according to a second embodiment of the present invention;
fig. 3 is a schematic block diagram of a ground resistance detector according to a third embodiment of the present invention;
fig. 4 is a schematic block diagram of a ground resistance detector according to a fourth embodiment of the present invention;
FIG. 5 is a circuit schematic of the waveform generation module;
FIG. 6 is a circuit schematic of a rectifier module;
fig. 7 is a circuit schematic of the band pass filter module.
Reference numerals:
the device comprises a control module 100, a waveform generation module 200, a signal stabilization module 300, a first coil 400, a second coil 500, a signal amplification module 600, a band-pass filtering module 700, a low-pass filtering circuit 710, a high-pass filtering circuit 720 and a rectification module 800.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is two or more, and if there is a description that the first and the second are only used for distinguishing technical features, it is not understood that the indication or the implication of relative importance or the implication of indicating the number of the indicated technical features or the implication of indicating the precedence of the indicated technical features.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, according to the present invention, a ground resistance detector includes a control module 100, a waveform generating module 200, a first coil 400, a second coil 500 and a band-pass filtering module 700.
The waveform generating module 200 is electrically connected to an output terminal of the control module 100, the first coil 400 is electrically connected to an output terminal of the waveform generating module 200, the band-pass filtering module 700 includes a low-pass filtering circuit 710 and a high-pass filtering circuit 720, which are electrically connected in sequence, an input terminal of the low-pass filtering circuit 710 is electrically connected to the second coil 500, and an output terminal of the high-pass filtering circuit 720 is electrically connected to the control module 100.
The ground wire of the grounding system simultaneously passes through the first coil 400 and the second coil 500, and the ground wire is not contacted with the first coil 400 and the second coil 500, the control module 100 outputs a signal to the waveform generating module 200, the waveform generating module 200 generates a detection waveform signal accordingly, the detection waveform signal acts on the first coil 400, so that the first coil 400 generates a first magnetic field, the ground wire generates a second magnetic field under the action of the first magnetic field, the second coil 500 generates a coupling electrical signal under the action of the second magnetic field generated by the ground wire, the coupling electrical signal filters a high-frequency signal through the low-pass filter circuit 710, the low-frequency signal is filtered through the high-pass filter circuit 720 and then is output to the control module 100, and the control module 100 can calculate the grounding resistance of the ground wire according to the received signal. The ground resistance detector provided by the embodiment of the utility model can rapidly obtain the electric signal corresponding to the ground resistance in an electromagnetic induction mode, and obtain the ground resistance value of the ground wire through the corresponding relation between the electric signal and the resistance value, has high detection efficiency, is not in contact with the ground wire to be detected, and does not influence the lightning protection effect of equipment; moreover, the high-frequency signal and the low-frequency signal can be filtered through the low-pass filtering module and the high-pass filtering module, so that an electric signal with the same frequency as the detected waveform signal is obtained, the influence of interference signals on a measurement result is prevented, and the measurement precision is improved.
It is contemplated that control module 100 may be a single chip or a field-programmable gate array.
Referring to fig. 2, the ground resistance detector according to the second embodiment of the present invention further includes a signal stabilizing module 300 on the basis of the first embodiment, wherein the signal stabilizing module 300 is electrically connected between the waveform generating module 200 and the first coil 400.
By adding the signal stabilizing module 300 between the waveform generating module 200 and the first coil 400, the stability of the electrical signal output by the waveform generating module 200 can be ensured without being disturbed by the outside, thereby ensuring the measurement accuracy.
In the second embodiment of the present invention, the signal stabilizing module 300 includes a constant voltage amplifying circuit and/or a constant current amplifying circuit, and the constant voltage amplifying circuit and/or the constant current amplifying circuit are electrically connected between the waveform generating module 200 and the first coil 400. The constant voltage amplifying circuit can ensure the voltage stability of the input electric signal, the constant current amplifying circuit can ensure the current stability of the input electric signal, and the constant voltage amplifying circuit and/or the constant current amplifying circuit can ensure that the electric signal output by the waveform generating module 200 can be stably transmitted to the first coil 400, thereby improving the measurement precision.
Specifically, the signal stabilizing module 300 includes a constant voltage amplifying circuit and a constant current amplifying circuit electrically connected in sequence, an input terminal of the constant voltage amplifying circuit is electrically connected to the waveform generating module 200, and an output terminal of the constant current amplifying circuit is electrically connected to the first coil 400.
It is worth mentioning that the embodiment of the utility model provides an in constant voltage amplifier circuit and constant current amplifier circuit all can adopt the model to realize for components and parts such as OPA 2188's operational amplifier chip bonding resistance, electric capacity.
Referring to fig. 3, according to the third embodiment of the present invention, on the basis of the second embodiment, the ground resistance detector further includes a signal amplification module 600, an input end of the signal amplification module 600 is electrically connected to the second coil 500, and an output end of the signal amplification module 600 is electrically connected to an input end of the low pass filter circuit 710.
By arranging the signal amplification module 600 between the second coil 500 and the low-pass filter circuit 710, the signal amplification module 600 can amplify the coupling electrical signal generated on the second coil 500, thereby preventing the situation that the subsequent module cannot process the signal due to the fact that the coupling electrical signal on the second coil 500 is too weak.
It is contemplated that the signal amplification module 600 may be implemented using an operational amplifier chip with model number OPA2188 in combination with components such as resistors and capacitors.
Referring to fig. 4, according to the utility model discloses ground resistance detector of fourth embodiment, on the basis of third embodiment, still include rectifier module 800, rectifier module 800's input and high pass filter circuit 720's output electric connection, rectifier module 800's output and control module 100 electric connection through set up rectifier module 800 between high pass filter circuit 720 and control module 100, can be with alternating current signal conversion for direct current signal, and control module 100 of being convenient for is handled and is calculated it.
Referring to fig. 6, in some specific examples of the fourth embodiment of the present invention, the rectifying module 800 includes a resistor R14, an operational amplifier U4, a diode D1, a resistor R15, a diode D1, a resistor R15, a diode D2, a resistor R16, a resistor R18, an operational amplifier U5, and a resistor R17.
A first terminal of the resistor R14 is electrically connected to the output terminal of the high pass filter circuit 720, an inverting input terminal of the operational amplifier U4 is electrically connected to the second terminal of the resistor R14, a non-inverting input terminal of the operational amplifier U4 is grounded, the diode D1 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U4, a first terminal of the resistor R15 is electrically connected to the second terminal of the resistor R14, a second terminal of the resistor R15 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the output terminal of the operational amplifier U2, the resistor R16 is electrically connected between the second terminal of the resistor R15 and the inverting input terminal of the operational amplifier U5, a first terminal of the resistor R18 is electrically connected to the first terminal of the resistor R14, a second terminal of the resistor R18 is electrically connected to the inverting input terminal of the operational amplifier U5, a first terminal of the resistor R17 is electrically connected to the inverting input terminal of the operational amplifier U5, a second terminal of, the non-inverting input terminal of the operational amplifier U5 is grounded, and the output terminal of the operational amplifier U5 is electrically connected to the control module 100.
Specifically, the operational amplifier U4, the resistor R14, the resistor R15, the diode D1, and the diode D2 constitute a voltage-doubling inverting rectifying and amplifying circuit, and the operational amplifier U5, the resistor R16, the resistor R17, and the resistor R18 constitute an inverting summing circuit. The voltage-multiplying inverting rectification amplifying circuit avoids the problem that the signal amplitude of a small-amplitude alternating signal is smaller than the conduction voltage of the diode to cause the disconnection of the diode through the combination of the operational amplifier and the diode and the signal amplification function of the operational amplifier, and realizes the rectification of a half-wave precise signal. The voltage-multiplying inverting amplifying circuit and the inverting summing circuit are combined, and therefore rectification of full-wave precise signals is achieved.
Referring to fig. 5, in some specific examples of the present invention, the waveform generation module 200 includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, a capacitor C5, a capacitor C6, a capacitor C7, and an operational amplifier U3. A first end of the resistor R10 is electrically connected to the output end of the control module 100, a second end of the resistor R10 is electrically connected to a first end of the capacitor C5, and a second end of the capacitor C5 is electrically connected to a non-inverting input end of the operational amplifier U3; the resistor R11 is electrically connected between the second end of the resistor R10 and ground, and the resistor R13 is electrically connected between the inverting input terminal of the operational amplifier U3 and ground; the resistor R12 is electrically connected between the non-inverting input terminal and the output terminal of the operational amplifier U3, the capacitor C6 is electrically connected between the second terminal of the resistor R10 and the output terminal of the operational amplifier U3, the first terminal of the capacitor C7 is electrically connected to the output terminal of the operational amplifier U3, and the second terminal of the capacitor C7 is the output terminal of the waveform generation module 200. In this embodiment, the control module 100 is a single chip microcomputer capable of generating a high-frequency square wave signal, and the single chip microcomputer outputs the high-frequency square wave signal to the waveform generating module 200, and the high-frequency square wave signal is converted into a high-frequency sine wave signal by the waveform generating module 200 and is output to the first coil 400. Through setting control module 100 to the singlechip that can produce high frequency square wave signal, the mode that waveform generation module 200 converts high frequency square wave signal into high frequency sine wave signal compares in the mode that only directly produces sine wave signal through sine wave generator, and the structure is simpler to need not use sine wave generator, can effective reduce cost.
In some specific examples of the embodiments of the present invention, the control module 100 is connected to the terminal device in a wired and/or wireless manner. The control module 100 is connected with a terminal device in a wired and/or wireless manner, the control module 100 can be remotely controlled through the terminal device, and the measurement result is output to the terminal device, so that online ground resistance measurement is realized, and the measurement efficiency is improved. And one terminal device may be connected to a plurality of control modules 100, thereby implementing online measurement of ground resistance at a plurality of locations.
It is conceivable that the control module 100 may be a single chip microcomputer, the terminal device may be a computer, and the single chip microcomputer and the computer may be connected through an RS485 bus or may be connected through a radio frequency chip.
Referring to fig. 7, in some specific examples of embodiments of the present invention, the low pass filter circuit 710 includes a resistor R1, a resistor R3, a resistor R2, an operational amplifier U1, a capacitor C1, a capacitor C2, a resistor R4, and a resistor R5. Specifically, a first end of the resistor R1 is an input end of the low pass filter circuit 710, a second end of the capacitor R1 is electrically connected to a first end of the resistor R2, a second end of the resistor R2 is electrically connected to a non-inverting input end of the operational amplifier U1, the resistor R3 is electrically connected between a second end of the resistor R1 and ground, the capacitor C1 is electrically connected between the second end of the resistor R2 and ground, the capacitor C2 is electrically connected between the second end of the resistor R1 and an output end of the operational amplifier U1, the resistor R4 is electrically connected between an inverting input end of the operational amplifier U1 and ground, and the resistor R5 is electrically connected between an inverting input end and an output end of the operational amplifier U1.
In the low-pass filter circuit 710, an operational amplifier U1, a resistor R4 and a resistor R5 form an in-phase proportional amplification circuit, the resistor R1, the resistor R2, a capacitor C1 and a capacitor C2 form a two-order RC filter circuit, and the two-order RC filter circuit plays a role in weakening an input signal of the operational amplifier U1, so that the voltage amplification factor of the operational amplifier U1 is reduced, and thus the high-frequency end of the frequency amplitude characteristic of the low-pass filter circuit 710 is rapidly attenuated, only a low-frequency end signal is allowed to pass, high-frequency interference signals are filtered, the signal quality is improved, and the measurement accuracy is improved. In the low-pass filter circuit 710, the ground resistor R3 can play a role in quickly discharging charges, so that the response speed of the circuit is improved.
Referring to fig. 7, in some specific examples of embodiments of the present invention, the high-pass filter circuit 720 includes a capacitor C3, a capacitor C4, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, a first end of the capacitor C3 is electrically connected to an output end of the operational amplifier U1, a capacitor C4 is electrically connected between a second end of the capacitor C3 and a non-inverting input end of the operational amplifier U2, a resistor R7 is electrically connected between a second end of the capacitor C3 and an output end of the operational amplifier U2, a resistor R6 is electrically connected between the non-inverting input end of the operational amplifier U2 and ground, a resistor R9 is electrically connected between an inverting input end of the operational amplifier U2 and ground, and a resistor R8 is electrically connected between the inverting input end and the output end of the operational amplifier U2.
In the high-pass filter circuit 720, the operational amplifier U2, the resistor R8 and the resistor R9 form a equidirectional proportional amplifying circuit, the capacitor C3, the capacitor C4, the resistor R6 and the resistor R7 form a two-order high-pass RC filter circuit, the two-order high-pass RC filter circuit plays a role in amplifying an input signal of the operational amplifier U2, only a high-frequency signal is allowed to pass through the high-pass filter circuit 720, low-frequency interference signals are filtered, signal quality is improved, and signal accuracy is further improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. A grounding resistance detector is characterized by comprising:
a control module;
the waveform generation module is electrically connected with the output end of the control module;
the first coil is electrically connected with the output end of the waveform generation module;
a second coil;
the band-pass filtering module comprises a low-pass filtering circuit and a high-pass filtering circuit which are electrically connected in sequence, the input end of the low-pass filtering circuit is electrically connected with the second coil, and the output end of the high-pass filtering circuit is electrically connected with the control module.
2. The ground resistance detector according to claim 1, characterized in that: the input end of the signal stabilizing module is electrically connected with the waveform generating module, and the output end of the signal stabilizing module is electrically connected with the first coil.
3. The ground resistance detector according to claim 2, characterized in that: the signal stabilizing module comprises a constant voltage amplifying circuit and/or a constant current amplifying circuit.
4. A ground resistance detector according to claim 1, 2 or 3, characterized in that: the signal amplification module is electrically connected between the second coil and the low-pass filter circuit.
5. The ground resistance detector according to claim 4, characterized in that: the rectifier module is electrically connected between the high-pass filter circuit and the control module.
6. The ground resistance detector of claim 5, wherein the rectifier module comprises:
a resistor R14, wherein a first end of the resistor R14 is electrically connected with an output end of the high-pass filter circuit;
an inverting input end of the operational amplifier U4 is electrically connected with a second end of the resistor R14, and a non-inverting input end of the operational amplifier U4 is grounded;
a diode D1, wherein a cathode of the diode D1 is electrically connected to an inverting input terminal of the operational amplifier U4, and an anode of the diode D1 is electrically connected to an output terminal of the operational amplifier U4;
a resistor R15, wherein a first end of the resistor R15 is electrically connected with a second end of the resistor R14;
a diode D2, a cathode of the diode D2 being electrically connected to the output terminal of the operational amplifier U4, and an anode of the diode D2 being electrically connected to the second terminal of the resistor R15;
a resistor R16, wherein a first end of the resistor R16 is electrically connected with a second end of the resistor R15;
a resistor R18, a first end of the resistor R18 being electrically connected to a first end of the resistor R14, a second end of the resistor R18 being electrically connected to a second end of the resistor R16;
an inverting input end of the operational amplifier U5 is electrically connected to the second end of the resistor R16, a non-inverting input end of the operational amplifier U5 is grounded, and an output end of the operational amplifier U5 is electrically connected to the control module;
a resistor R17, a first terminal of the resistor R17 is electrically connected to the inverting input terminal of the operational amplifier U5, and a second terminal of the resistor R17 is electrically connected to the output terminal of the operational amplifier U5.
7. A ground resistance detector according to claim 1, 2 or 3, characterized in that: the rectifier module is electrically connected between the high-pass filter circuit and the control module.
8. The ground resistance detector of claim 1, wherein the low pass filter circuit comprises:
a resistor R1, wherein a first end of the resistor R1 is an input end of the low-pass filter circuit;
a resistor R3, a first end of the resistor R3 is electrically connected with a second end of the resistor R1, and a second end of the resistor R3 is grounded;
a resistor R2, wherein a first end of the resistor R2 is electrically connected with a second end of the resistor R1;
an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is electrically connected to the second terminal of the resistor R2, and an output terminal of the operational amplifier U1 is electrically connected to the input terminal of the high-pass filter circuit;
a capacitor C1, wherein a first terminal of the capacitor C1 is electrically connected to a second terminal of the resistor R2, and a second terminal of the capacitor C1 is grounded;
a capacitor C2, wherein a first terminal of the capacitor C2 is electrically connected to a second terminal of the resistor R1, and a second terminal of the capacitor C2 is electrically connected to an output terminal of the operational amplifier U1;
a resistor R4, wherein a first end of the resistor R4 is electrically connected with an inverting input end of the operational amplifier U1, and a second end of the resistor R4 is grounded;
a resistor R5, a first terminal of the resistor R5 is electrically connected to the inverting input terminal of the operational amplifier U1, and a second terminal of the resistor R5 is electrically connected to the output terminal of the operational amplifier U1.
9. The ground resistance detector of claim 1, wherein the high pass filter circuit comprises:
a capacitor C3, wherein a first end of the capacitor C3 is electrically connected with an output end of the low-pass filter circuit;
a capacitor C4, wherein a first end of the capacitor C4 is electrically connected to a second end of the capacitor C3;
a resistor R6, wherein a first end of the resistor R6 is electrically connected to a second end of the capacitor C4, and a second end of the resistor R6 is grounded;
an operational amplifier U2, wherein a non-inverting input terminal of the operational amplifier U2 is electrically connected to the second terminal of the capacitor C4, and an output terminal of the operational amplifier U2 is an output terminal of the high-pass filter circuit;
a resistor R7, a first end of the resistor R7 being electrically connected to a second end of the capacitor C3, a second end of the resistor R7 being electrically connected to the output of the operational amplifier U2;
a resistor R9, wherein a first end of the resistor R9 is electrically connected with an inverting input end of the operational amplifier U2, and a second end of the resistor R9 is grounded;
a resistor R8, a first end of the resistor R8 is electrically connected to a first end of the resistor R9, and a second end of the resistor R8 is electrically connected to an output terminal of the operational amplifier U2.
10. The ground resistance detector according to claim 1, characterized in that: the control module is connected with terminal equipment in a wired and/or wireless mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022279607.1U CN213633622U (en) | 2020-10-13 | 2020-10-13 | Ground resistance detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022279607.1U CN213633622U (en) | 2020-10-13 | 2020-10-13 | Ground resistance detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213633622U true CN213633622U (en) | 2021-07-06 |
Family
ID=76660488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022279607.1U Active CN213633622U (en) | 2020-10-13 | 2020-10-13 | Ground resistance detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213633622U (en) |
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2020
- 2020-10-13 CN CN202022279607.1U patent/CN213633622U/en active Active
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