CN111308274A - Circuit short circuit and short circuit position detection device - Google Patents
Circuit short circuit and short circuit position detection device Download PDFInfo
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- CN111308274A CN111308274A CN202010185039.0A CN202010185039A CN111308274A CN 111308274 A CN111308274 A CN 111308274A CN 202010185039 A CN202010185039 A CN 202010185039A CN 111308274 A CN111308274 A CN 111308274A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a line short circuit and short circuit position detection device, which comprises a constant voltage constant current source, a current sampling circuit, a constant voltage constant current switching circuit, a voltage sampling circuit and a processor, wherein the constant voltage constant current source is connected with the current sampling circuit; the output end of the constant-voltage constant-current source is electrically connected with the input end of the current sampling circuit, the sampling end of the current sampling circuit is electrically connected with a line to be tested, the output end of the current sampling circuit is electrically connected with the input end of the constant-voltage constant-current switching circuit, and the output end of the constant-voltage constant-current switching circuit is electrically connected with the controlled end of the constant-voltage constant-current source; the sampling end of the voltage sampling circuit is electrically connected with the line to be tested, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are electrically connected with the processor. The invention calculates the short-circuit distance of the wire according to the collected voltage and current data and the combination of the cross-sectional area and the resistivity parameter of the wire.
Description
Technical Field
The invention relates to the field of circuit detection, in particular to a line short circuit and a short circuit position detection device.
Background
In production life, circuit faults often occur, how to judge the circuit faults are caused by circuit short-circuit, and how to judge the positions of the short-circuit faults after the short-circuit faults occur are problems to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a line short circuit and short circuit position detection device, which can detect whether a line has a short circuit fault and the position of the short circuit fault.
The technical scheme for solving the technical problems is as follows: a line short circuit and short circuit position detection device comprises a constant-voltage constant-current source, a current sampling circuit, a constant-voltage constant-current switching circuit, a voltage sampling circuit and a processor; the output end of the constant-voltage constant-current source is electrically connected with the input end of the current sampling circuit, the sampling end of the current sampling circuit is electrically connected with a line to be tested, the output end of the current sampling circuit is electrically connected with the input end of the constant-voltage constant-current switching circuit, and the output end of the constant-voltage constant-current switching circuit is electrically connected with the controlled end of the constant-voltage constant-current source; the sampling end of the voltage sampling circuit is electrically connected with the line to be tested, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are electrically connected with the processor.
The invention has the beneficial effects that: in the line short circuit and short circuit position detection device, the working mode of the constant voltage and constant current source can be switched between a constant voltage mode and a constant current mode through the constant voltage and constant current switching circuit; when the line to be detected is not short-circuited, the access end of the line short-circuit and short-circuit position detection device is in an idle state, the current in the main circuit is zero, the current is fed back to the constant-voltage constant-current switching circuit through the current sampling circuit, and the constant-voltage constant-current source is controlled to be in a constant-voltage mode at the moment; when a line to be detected is short-circuited, the current in the circuit is increased sharply due to the fact that the resistance of a lead is small, and when a certain threshold value is reached, the current sampling circuit controls the constant-voltage constant-current switching circuit to switch the constant-voltage constant-current source into a constant-current mode through current feedback; at the moment, the current sampling circuit reads current data in the current circuit, the voltage acquisition circuit reads current voltage data, and the wire short-circuit distance is calculated according to the acquired voltage and current data and the combination of the cross-sectional area and the resistivity parameter of the wire.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, a display is provided on the processor.
Further, the processor has stored therein resistivity data and cross-sectional area data for a plurality of wires.
Further, a key input circuit is arranged on the processor.
Further, the constant-voltage constant-current source comprises a direct-current power supply converter chip U1, capacitors C1-C5, a filter inductor L1, resistors R1-R2 and a voltage stabilizing diode D2; both ends of a capacitor C1 and both ends of a capacitor C2 are respectively connected to a VIN pin and a GND pin of a DC power converter chip U1, both ends of a capacitor C3 are respectively connected to a VIN pin and a VC pin of the DC power converter chip U1, one end of a capacitor C4 and one end of a capacitor C5 are respectively connected to a SW pin of the DC power converter chip U1 through a filter inductor L1, and the other end of a capacitor C4 and the other end of the capacitor C5 are respectively connected to a GND pin of the DC power converter chip U1; one end of a resistor R1 is connected to a SW pin of a DC power converter chip U1 through a filter inductor L1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of a resistor R2 is connected to a GND pin of a DC power converter chip U1, and a common connection end of the resistor R1 and the resistor R2 is also connected to an FB pin of the DC power converter chip U1; two ends of the voltage-stabilizing diode D2 are respectively connected to the SW pin and the GND pin of the DC power converter chip U1; the VIN pin of the dc power converter chip U1 is connected to a voltage of 5V, and the GND pin of the dc power converter chip U1 is grounded.
Further, the model of the direct current power supply converter chip U1 is XL 4016.
Furthermore, the current acquisition circuit comprises a current sampling chip U2 and a sampling resistor R3, a REF1 pin and a REF2 pin of the current sampling chip U2 are grounded, a V + pin of the current sampling chip U2 is connected with 5V voltage, an OUT pin of the current sampling chip U2 is connected to a constant-voltage constant-current switching circuit, two ends of the sampling resistor R3 are respectively connected to an-IN pin and a + IN pin of the current sampling chip U2, the-IN pin of the current sampling chip U2 is connected to an SW pin of the DC power converter chip U1 through a filter inductor L1, and the + IN pin of the current sampling chip U2 is electrically connected with a line to be tested; the OUT pin of the current sampling chip U2 is electrically connected to the processor.
Further, the constant-voltage constant-current switching circuit comprises a voltage comparator U4, a voltage stabilizing chip U3, resistors R4-R7, a capacitor C6 and a diode D1; one end of a resistor R4 is connected with 5V voltage, the other end of the resistor R4 is connected with the negative input end of a voltage comparator U4 through a resistor R5, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected with the negative input end of a voltage comparator U4, one end of the resistor R7 is connected with 5V voltage, the other end of the resistor R7 is connected with the output end of a voltage comparator U4, and the positive input end of the voltage comparator U4 is connected with the OUT pin of a current sampling chip U2 in the current sampling circuit; one end of the capacitor C6 is connected to the common connection end of the resistor R4 and the resistor R5, and the other end of the capacitor C6 is grounded; the negative electrode and the reference end of the voltage stabilizing chip U3 are both connected to the common connection end of the resistor R4 and the resistor R5, and the positive electrode of the voltage stabilizing chip U3 is grounded; the anode of the diode D1 is connected to the output terminal of the voltage comparator U4, and the cathode of the diode D1 is connected to the common connection terminal of the resistor R1 and the resistor R2 in the constant-voltage constant-current source.
Further, the model of the current sampling chip U2 is INA 282; the model number of the voltage stabilizing chip U3 is TL 431.
Further, the voltage acquisition circuit comprises an operational amplifier U5, resistors R8-R10, capacitors C7-C8 and a diode D3; one end of a resistor R8 is connected to a line to be tested, the other end of the resistor R8 is connected to the positive input end of an operational amplifier U5, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected to the negative input end of an operational amplifier U5, one end of a resistor R10 is connected to the negative input end of an operational amplifier U5, and the other end of the resistor R10 is connected to the output end of an operational amplifier U5; one end of a capacitor C7 is connected to the positive input end of the operational amplifier U5, the other end of the capacitor C7 is grounded, one end of a capacitor C8 is connected to the output end of the operational amplifier U5, and the other end of a capacitor C8 is grounded; the anode of the diode D3 is connected to the positive input end of the operational amplifier U5, and the cathode of the diode D3 is connected with 5V voltage; the output of the operational amplifier U5 is electrically connected to the processor.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a short circuit and short circuit position detection device according to the present invention;
FIG. 2 is a schematic diagram of a wire short circuit measurement;
FIG. 3 is a schematic diagram of a circuit configuration of a constant voltage and constant current source;
fig. 4 is a schematic circuit diagram of a constant voltage and constant current switching circuit;
FIG. 5 is a schematic circuit diagram of a current sampling circuit;
fig. 6 is a schematic circuit diagram of the voltage sampling circuit.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a line short-circuit and short-circuit position detection device includes a constant-voltage constant-current source, a current sampling circuit, a constant-voltage constant-current switching circuit, a voltage sampling circuit, and a processor; the output end of the constant-voltage constant-current source is electrically connected with the input end of the current sampling circuit, the sampling end of the current sampling circuit is electrically connected with a line to be tested, the output end of the current sampling circuit is electrically connected with the input end of the constant-voltage constant-current switching circuit, and the output end of the constant-voltage constant-current switching circuit is electrically connected with the controlled end of the constant-voltage constant-current source; the sampling end of the voltage sampling circuit is electrically connected with the line to be tested, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are electrically connected with the processor.
In this embodiment, a display is provided on the processor; the processor stores resistivity data and cross-sectional area data of various wires; and the processor is provided with a key input circuit. Specifically, the display is used for displaying whether the line is short-circuited, and if the line is short-circuited, the short-circuit distance is displayed; the key input circuit is mainly used for setting the resistivity value rho and the cross section area S of a wire in a circuit to be tested, and the resistivity of the wire made of common materials such as copper, aluminum and the like and the cross section area of a common wire are built in the processor, such as 4 square, 2.5 square, 1.5 square and the like.
When the line to be detected is short-circuited, the current and the voltage of the line to be detected are collected through the current sampling circuit and the voltage sampling circuit and then transmitted to the processor for operation, so that the short-circuit distance of the line can be obtained, and the position of the short circuit can be known. The principle of the processor calculating the short circuit distance is as follows:
a, B are two equidistant conductors of the same material and the same cross-sectional area, respectively, as shown in FIG. 2. when two conductors are shorted by conductor C (the length of C is ignored), the total length of the conductor is 2X. According to a wire resistance calculation formula:
wherein R is the wire resistance, ρ is the resistivity of the wire material, L is the wire length, and S is the cross-sectional area. From equation (1) we can obtain:
in the formula (2), the resistivity rho of each material wire has a uniform standard value, the cross section area of each wire also has a uniform standard value, and when the resistance R of the wire is known, the total length L of the wire can be calculated according to the formula (2)General assemblyThen short circuit distance
And the wire resistance:
from equation (3), it can be seen that to know the resistance of the wire, it is only necessary to measure the current flowing through the wire and the voltage across the wire.
In the line short circuit and short circuit position detection device, the working mode of the constant voltage and constant current source can be switched between a constant voltage mode and a constant current mode through the constant voltage and constant current switching circuit; when the line to be detected is not short-circuited, the access end of the line short-circuit and short-circuit position detection device is in an idle state, the current in the main circuit is zero, the current is fed back to the constant-voltage constant-current switching circuit through the current sampling circuit, and the constant-voltage constant-current source is controlled to be in a constant-voltage mode at the moment; when a line to be detected is short-circuited, the current in the circuit is increased sharply due to the fact that the resistance of a lead is small, and when a certain threshold value is reached, the current sampling circuit controls the constant-voltage constant-current switching circuit to switch the constant-voltage constant-current source into a constant-current mode through current feedback; at the moment, the current sampling circuit reads current data in the current circuit, the voltage acquisition circuit reads current voltage data, and the wire short-circuit distance is calculated according to the acquired voltage and current data and the combination of the cross-sectional area and the resistivity parameter of the wire.
The following describes each of the circuits in detail:
as shown in fig. 3, the constant-voltage constant-current source comprises a dc power converter chip U1, capacitors C1-C5, a filter inductor L1, resistors R1-R2, and a zener diode D2; both ends of a capacitor C1 and both ends of a capacitor C2 are respectively connected to a VIN pin and a GND pin of a DC power converter chip U1, both ends of a capacitor C3 are respectively connected to a VIN pin and a VC pin of the DC power converter chip U1, one end of a capacitor C4 and one end of a capacitor C5 are respectively connected to a SW pin of the DC power converter chip U1 through a filter inductor L1, and the other end of a capacitor C4 and the other end of the capacitor C5 are respectively connected to a GND pin of the DC power converter chip U1; one end of a resistor R1 is connected to a SW pin of a DC power converter chip U1 through a filter inductor L1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of a resistor R2 is connected to a GND pin of a DC power converter chip U1, and a common connection end of the resistor R1 and the resistor R2 is also connected to an FB pin of the DC power converter chip U1; two ends of the voltage-stabilizing diode D2 are respectively connected to the SW pin and the GND pin of the DC power converter chip U1; the VIN pin of the dc power converter chip U1 is connected to a voltage of 5V, and the GND pin of the dc power converter chip U1 is grounded.
The model of the direct-current power supply converter chip U1 is XL 4016.
As shown IN fig. 5, the current collecting circuit includes a current sampling chip U2 and a sampling resistor R3, a REF1 pin, a REF2 pin and a GND pin of the current sampling chip U2 are grounded, a V + pin of the current sampling chip U2 is connected with 5V voltage, an OUT pin of the current sampling chip U2 is connected to a constant voltage and constant current switching circuit, two ends of the sampling resistor R3 are respectively connected to an-IN pin and a + IN pin of the current sampling chip U2, the-IN pin of the current sampling chip U2 is connected to a SW pin of the dc power converter chip U1 through a filter inductor L1, and the + IN pin of the current sampling chip U2 is electrically connected to a line to be tested; the OUT pin of the current sampling chip U2 is electrically connected to the processor.
As shown in fig. 4, the constant voltage and constant current switching circuit includes a voltage comparator U4, a voltage stabilizing chip U3, resistors R4-R7, a capacitor C6 and a diode D1; one end of a resistor R4 is connected with 5V voltage, the other end of the resistor R4 is connected with the negative input end of a voltage comparator U4 through a resistor R5, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected with the negative input end of a voltage comparator U4, one end of the resistor R7 is connected with 5V voltage, the other end of the resistor R7 is connected with the output end of a voltage comparator U4, and the positive input end of the voltage comparator U4 is connected with the OUT pin of a current sampling chip U2 in the current sampling circuit; one end of the capacitor C6 is connected to the common connection end of the resistor R4 and the resistor R5, and the other end of the capacitor C6 is grounded; the negative electrode and the reference end of the voltage stabilizing chip U3 are both connected to the common connection end of the resistor R4 and the resistor R5, and the positive electrode of the voltage stabilizing chip U3 is grounded; the anode of the diode D1 is connected to the output terminal of the voltage comparator U4, and the cathode of the diode D1 is connected to the common connection terminal of the resistor R1 and the resistor R2 in the constant-voltage constant-current source.
The model of the current sampling chip U2 is INA 282; the model number of the voltage stabilizing chip U3 is TL 431.
As shown in FIG. 6, the voltage acquisition circuit comprises an operational amplifier U5, resistors R8-R10, capacitors C7-C8 and a diode D3; one end of a resistor R8 is connected to a line to be tested, the other end of the resistor R8 is connected to the positive input end of an operational amplifier U5, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected to the negative input end of an operational amplifier U5, one end of a resistor R10 is connected to the negative input end of an operational amplifier U5, and the other end of the resistor R10 is connected to the output end of an operational amplifier U5; one end of a capacitor C7 is connected to the positive input end of the operational amplifier U5, the other end of the capacitor C7 is grounded, one end of a capacitor C8 is connected to the output end of the operational amplifier U5, and the other end of a capacitor C8 is grounded; the anode of the diode D3 is connected to the positive input end of the operational amplifier U5, and the cathode of the diode D3 is connected with 5V voltage; the output of the operational amplifier U5 is electrically connected to the processor.
In this particular embodiment:
fig. 3 is a constant voltage and constant current source designed by XL4016, wherein a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5 are all filter capacitors, and a resistor R1 and a resistor R2 are feedback divider resistors for acquiring output voltage. When the line to be tested is not short-circuited, the XL4016 sampling end is adjusted through voltage division of a resistor R1 and a resistor R2 to realize a constant voltage mode; when the line to be tested is short-circuited, because the resistance of the lead is very small, no large-resistance device exists in the main circuit, the voltage of the main circuit is instantly and rapidly reduced, and the current is rapidly increased; due to the sharp voltage drop, the sampling values of the resistor R1 and the resistor R2 are very small, so that the sampling of the resistor R1 and the resistor R2 fails; at the moment, the feedback end connected through the LJ2 works, and meanwhile, the constant voltage and constant current switching circuit controls and switches to a constant current mode.
As shown in fig. 4, the negative input end of the voltage comparator U4 is connected to the reference voltage source circuit, the positive input end thereof is connected to the feedback end of the current sampling circuit, when the line to be tested is not short-circuited, the current sampling is zero, and the voltage of the positive input end of the voltage comparator U4 is smaller than that of the negative input end, so that the voltage of the output end of the voltage comparator U4 is 0, and the LJ2 port fails; when the line to be tested is not short-circuited, the current of the main circuit is increased sharply, the current sampling is increased, and when the sampling voltage is higher than the reference voltage, namely the voltage of the positive input end of the voltage comparator U4 is higher than that of the negative input end, the output of the voltage comparator U4 is positive; at this time, the LJ2 port is enabled, the feedback formed by the resistor R1 and the resistor R2 in fig. 3 fails, and the new feedback formed by the resistor R2 in fig. 3 and the resistor R7 in fig. 4 operates, because the sampling points of the resistor R2 and the resistor R7 are fixed voltage values, the constant current and the constant voltage are realized.
In fig. 4, in order to provide 1V input voltage to the negative input terminal of the voltage comparator U4, the circuit uses the regulator chip U3 to provide 2.5V regulated voltage, as long as the resistor R5 and the resistor R6 satisfy the following formula.
The end LJ1 in FIG. 4 is connected with a current collecting circuit, and the current collecting circuit is shown in FIG. 5; in fig. 5, LJ4 is connected with a constant voltage and constant current source, a resistor R3 is a sampling resistor, the resistance value of the sampling resistor is 0.02 ohm, current sampling is realized by using an INA282 chip, and J2 is the access end of a line to be tested. The processor can judge whether the short circuit wire is connected or not by reading the magnitude of the sampling current, the current is increased greatly when the circuit is short-circuited, and whether the short circuit exists or not can be judged by setting a current threshold.
The voltage sampling circuit is shown in fig. 6, the voltage sampling is the voltage to ground of the access conductor, and because the resistance of the access conductor is very small, the voltage at two ends of the access conductor is very low, and needs to be amplified to a voltage range which can be read by a processor, the voltage is amplified by using an operational amplifier U5, the amplification factor is R10/R9, and the voltage can be adjusted and amplified to a proper range by changing the ratio of the resistor R10 to the resistor R9.
In the line short circuit and short circuit position detection device, the working mode of the constant voltage and constant current source can be switched between a constant voltage mode and a constant current mode through the constant voltage and constant current switching circuit; when the line to be detected is not short-circuited, the access end of the line short-circuit and short-circuit position detection device is in an idle state, the current in the main circuit is zero, the current is fed back to the constant-voltage constant-current switching circuit through the current sampling circuit, and the constant-voltage constant-current source is controlled to be in a constant-voltage mode at the moment; when a line to be detected is short-circuited, the current in the circuit is increased sharply due to the fact that the resistance of a lead is small, and when a certain threshold value is reached, the current sampling circuit controls the constant-voltage constant-current switching circuit to switch the constant-voltage constant-current source into a constant-current mode through current feedback; at the moment, the current sampling circuit reads current data in the current circuit, the voltage acquisition circuit reads current voltage data, and the wire short-circuit distance is calculated according to the acquired voltage and current data and the combination of the cross-sectional area and the resistivity parameter of the wire.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a short circuit of circuit and short circuit position detection device which characterized in that: the constant-voltage constant-current switching circuit comprises a constant-voltage constant-current source, a current sampling circuit, a constant-voltage constant-current switching circuit, a voltage sampling circuit and a processor; the output end of the constant-voltage constant-current source is electrically connected with the input end of the current sampling circuit, the sampling end of the current sampling circuit is electrically connected with a line to be tested, the output end of the current sampling circuit is electrically connected with the input end of the constant-voltage constant-current switching circuit, and the output end of the constant-voltage constant-current switching circuit is electrically connected with the controlled end of the constant-voltage constant-current source; the sampling end of the voltage sampling circuit is electrically connected with the line to be tested, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are electrically connected with the processor.
2. The short-circuit and short-circuit position detecting device according to claim 1, wherein: and a display is arranged on the processor.
3. The short-circuit and short-circuit position detecting device according to claim 1, wherein: the processor stores resistivity data and cross-sectional area data of various wires therein.
4. The short-circuit and short-circuit position detecting device according to claim 3, wherein: and the processor is provided with a key input circuit.
5. The short-circuit and short-circuit position detecting device according to any one of claims 1 to 4, characterized in that: the constant-voltage constant-current source comprises a direct-current power supply converter chip U1, capacitors C1-C5, a filter inductor L1, resistors R1-R2 and a voltage stabilizing diode D2; both ends of a capacitor C1 and both ends of a capacitor C2 are respectively connected to a VIN pin and a GND pin of a DC power converter chip U1, both ends of a capacitor C3 are respectively connected to a VIN pin and a VC pin of the DC power converter chip U1, one end of a capacitor C4 and one end of a capacitor C5 are respectively connected to a SW pin of the DC power converter chip U1 through a filter inductor L1, and the other end of a capacitor C4 and the other end of the capacitor C5 are respectively connected to a GND pin of the DC power converter chip U1; one end of a resistor R1 is connected to a SW pin of a DC power converter chip U1 through a filter inductor L1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of a resistor R2 is connected to a GND pin of a DC power converter chip U1, and a common connection end of the resistor R1 and the resistor R2 is also connected to an FB pin of the DC power converter chip U1; two ends of the voltage-stabilizing diode D2 are respectively connected to the SW pin and the GND pin of the DC power converter chip U1; the VIN pin of the dc power converter chip U1 is connected to a voltage of 5V, and the GND pin of the dc power converter chip U1 is grounded.
6. The short-circuit and short-circuit position detecting device according to claim 5, wherein: the model of the direct-current power supply converter chip U1 is XL 4016.
7. The short-circuit and short-circuit position detecting device according to claim 5, wherein: the current acquisition circuit comprises a current sampling chip U2 and a sampling resistor R3, a REF1 pin, a REF2 pin and a GND pin of the current sampling chip U2 are grounded, a V + pin of the current sampling chip U2 is connected with 5V voltage, an OUT pin of the current sampling chip U2 is connected to a constant-voltage constant-current switching circuit, two ends of the sampling resistor R3 are respectively connected to an-IN pin and a + IN pin of the current sampling chip U2, the-IN pin of the current sampling chip U2 is connected to a SW pin of a DC power converter chip U1 through a filter inductor L1, and the + IN pin of the current sampling chip U2 is electrically connected with a line to be tested; the OUT pin of the current sampling chip U2 is electrically connected to the processor.
8. The short-circuit and short-circuit position detecting device according to claim 7, wherein: the constant-voltage constant-current switching circuit comprises a voltage comparator U4, a voltage stabilizing chip U3, resistors R4-R7, a capacitor C6 and a diode D1; one end of a resistor R4 is connected with 5V voltage, the other end of the resistor R4 is connected with the negative input end of a voltage comparator U4 through a resistor R5, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected with the negative input end of a voltage comparator U4, one end of the resistor R7 is connected with 5V voltage, the other end of the resistor R7 is connected with the output end of a voltage comparator U4, and the positive input end of the voltage comparator U4 is connected with the OUT pin of a current sampling chip U2 in the current sampling circuit; one end of the capacitor C6 is connected to the common connection end of the resistor R4 and the resistor R5, and the other end of the capacitor C6 is grounded; the negative electrode and the reference end of the voltage stabilizing chip U3 are both connected to the common connection end of the resistor R4 and the resistor R5, and the positive electrode of the voltage stabilizing chip U3 is grounded; the anode of the diode D1 is connected to the output terminal of the voltage comparator U4, and the cathode of the diode D1 is connected to the common connection terminal of the resistor R1 and the resistor R2 in the constant-voltage constant-current source.
9. The short-circuit and short-circuit position detecting device according to claim 8, wherein: the model of the current sampling chip U2 is INA 282; the model number of the voltage stabilizing chip U3 is TL 431.
10. The short-circuit and short-circuit position detecting device according to any one of claims 1 to 4 and 6 to 9, wherein: the voltage acquisition circuit comprises an operational amplifier U5, resistors R8-R10, capacitors C7-C8 and a diode D3; one end of a resistor R8 is connected to a line to be tested, the other end of the resistor R8 is connected to the positive input end of an operational amplifier U5, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected to the negative input end of an operational amplifier U5, one end of a resistor R10 is connected to the negative input end of an operational amplifier U5, and the other end of the resistor R10 is connected to the output end of an operational amplifier U5; one end of a capacitor C7 is connected to the positive input end of the operational amplifier U5, the other end of the capacitor C7 is grounded, one end of a capacitor C8 is connected to the output end of the operational amplifier U5, and the other end of a capacitor C8 is grounded; the anode of the diode D3 is connected to the positive input end of the operational amplifier U5, and the cathode of the diode D3 is connected with 5V voltage; the output of the operational amplifier U5 is electrically connected to the processor.
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| CN202010185039.0A CN111308274A (en) | 2020-03-17 | 2020-03-17 | Circuit short circuit and short circuit position detection device |
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| CN202010185039.0A CN111308274A (en) | 2020-03-17 | 2020-03-17 | Circuit short circuit and short circuit position detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111998759A (en) * | 2020-09-10 | 2020-11-27 | 广州极飞科技有限公司 | Measuring device and irrigation system |
| CN112114273A (en) * | 2020-08-20 | 2020-12-22 | 深圳供电局有限公司 | Method and device for positioning direct current ground fault point |
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2020
- 2020-03-17 CN CN202010185039.0A patent/CN111308274A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114273A (en) * | 2020-08-20 | 2020-12-22 | 深圳供电局有限公司 | Method and device for positioning direct current ground fault point |
| CN111998759A (en) * | 2020-09-10 | 2020-11-27 | 广州极飞科技有限公司 | Measuring device and irrigation system |
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