DC power supply equipment line patrol instrument

Abstract

The present invention discloses a line inspection instrument for a DC power supply device, comprising a terminal power test device and a front-end signal processing device that are separately arranged; the terminal power test device comprises a polarity detection circuit and a signal generating circuit, both of which are electrically connected to the power supply end of the measured line, and the front-end signal processing device comprises a signal acquisition circuit, a signal processing circuit and a display screen that are electrically connected in sequence, and the signal acquisition circuit is also electrically connected to the measured line. In the present invention, a synchronization signal is coupled to the power supply end of the measured line by the terminal power test device, and then the synchronization signal is detected at other positions of the measured line by the front-end signal processing device, so as to determine whether two points are on the same line, thereby improving the accuracy of cable line finding.

Description

Technical Field

[0001] The invention relates to the technical field of line patrol instrument equipment, and in particular to a line patrol instrument for direct current power supply equipment. Background Art

[0002] At present, the equipment and power lines of multiple equipment operators are mixed together in communication base stations. When installing shunt metering equipment used to measure the power consumption of equipment of each equipment operator, a very important task is to clean up the power supply lines of the equipment of each equipment operator. When installing shunt metering equipment in practice, operators generally reported that there were problems such as chaotic on-site power wiring, difficulty in identification, and uncertainty of wiring harnesses, which led to slow equipment installation and high error rates. At present, the equipment harness tracking uses a clamp ammeter to test the current value at the power output end and the current value at the transmitting device end. If the current values ​​of the two are the same, they are considered to be the same line; however, there are a large number of lines with the same or similar current values ​​on site. At the same time, the error of measuring the current value using a clamp ammeter is more than 2%, so misjudgment often occurs. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a line patrol instrument for a DC power supply device. The terminal power test device couples a synchronization signal at the power supply end of the measured line, and the front-end signal processing device detects the synchronization signal at other positions of the measured line, thereby realizing cable line finding and improving the accuracy of line finding.

[0004] The objective of the present invention is achieved through the following technical scheme: a DC power supply equipment line patrol meter, comprising a terminal electrical testing device and a front-end signal processing device that are separately arranged; the terminal electrical testing device comprises a polarity detection circuit and a signal generating circuit, and the polarity detection circuit and the signal generating circuit are both electrically connected to the power supply end of the measured circuit, and the front-end signal processing device comprises a signal acquisition circuit, a signal processing circuit and a display screen that are electrically connected in sequence, and the signal acquisition circuit is also electrically connected to the measured circuit.

[0005] Preferably, the front-end signal processing device block further includes: a power supply, and the power supply is electrically connected to the signal acquisition circuit, the signal processing circuit and the display screen respectively.

[0006] Preferably, the signal acquisition circuit includes a sensor and an analog-to-digital conversion circuit, the sensor is electrically connected to the analog-to-digital conversion circuit and the measured circuit respectively, and the analog-to-digital conversion circuit is also electrically connected to the signal processing circuit.

[0007] Preferably, the signal acquisition circuit further includes an anti-aliasing filter circuit, and the anti-aliasing filter circuit is arranged between the analog-to-digital conversion circuit and the signal processing circuit, and the anti-aliasing filter circuit is electrically connected to the analog-to-digital conversion circuit and the signal processing circuit respectively.

[0008] Preferably, the sensor is a voltage sensor or a current sensor.

[0009] Preferably, the terminal electrical testing equipment also includes an anti-reverse connection circuit, the input end of the anti-reverse connection circuit is electrically connected to the output end of an external DC power supply through a power supply interface, and the output end of the anti-reverse connection circuit is electrically connected to the power supply ends of the polarity detection circuit and the signal generating circuit, respectively.

[0010] Preferably, the anti-reverse connection circuit includes a bridge rectifier circuit, a current limiting circuit and a voltage stabilizing circuit, the first input end of the bridge rectifier circuit is connected to the positive power input end of the power interface, the second input end of the bridge rectifier circuit is connected to the negative power input end of the power interface, the negative output end of the bridge rectifier circuit is grounded, the positive output end of the bridge rectifier circuit is respectively connected to the power supply end of the current limiting circuit, the signal generating circuit and / or the polarity detection circuit, the output end of the current limiting circuit is connected to the input end of the voltage stabilizing circuit, and the voltage stabilizing circuit is also electrically connected to the signal generating circuit and / or the polarity detection circuit.

[0011] The beneficial effects of the present invention are:

[0012] (1) The present invention couples a synchronization signal to the power supply end of the line under test through the end test equipment, and then uses the front-end signal processing equipment to detect the synchronization signal at other positions of the line under test, so as to determine whether the two points are connected, that is, whether the two points are on the same line, thereby improving the accuracy of cable tracing;

[0013] (2) The terminal test equipment is equipped with a polarity detection circuit to detect the positive and negative polarity of the power supply end of the tested line, thereby further improving the accuracy of cable tracing;

[0014] (3) The second circuit board of the terminal test equipment is provided with an anti-reverse connection circuit, which can avoid the harm caused by reverse connection when the terminal test equipment obtains power from the on-site DC power supply;

[0015] (4) The anti-reverse connection circuit uses a bridge rectifier circuit to solve the reverse connection problem. Regardless of whether the end test equipment is reversely connected or not, it can work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic block diagram of the present invention;

[0017] Figure 2 is a circuit block diagram of the signal acquisition circuit in the present invention;

[0018] Figure 3 is a circuit block diagram of the anti-reverse connection circuit in the present invention;

[0019] Figure 4 A circuit diagram of the anti-reverse connection circuit in the present invention. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-4 , this embodiment provides a DC power supply equipment line patrol instrument:

[0022] like Figure 1 As shown, the DC power supply equipment line patrol instrument includes a terminal power test device and a front-end signal processing device that are separately arranged; the terminal power test device includes a polarity detection circuit and a signal generating circuit, the signal ends of the polarity detection circuit and the signal generating circuit are electrically connected to the power supply end of the measured line through a signal interface, the power supply ends of the polarity detection circuit and the signal generating circuit are electrically connected to the output end of an external DC power supply, and the front-end signal processing device includes a signal acquisition circuit, a signal processing circuit and a display screen that are electrically connected in sequence, and the signal acquisition circuit is also electrically connected to the measured line.

[0023] The front-end signal processing device block also includes a power supply, which is electrically connected to the signal acquisition circuit, the signal processing circuit and the display screen respectively. The power supply is used to power the signal acquisition circuit, the signal processing circuit and the display screen. The power supply can be a lithium battery or the like.

[0024] The signal acquisition circuit includes a sensor and an analog-to-digital conversion circuit, wherein the sensor is electrically connected to the analog-to-digital conversion circuit and the circuit under test, respectively, and the analog-to-digital conversion circuit is also electrically connected to the signal processing circuit. The sensor is used to capture a synchronization signal from the circuit under test, and the analog-to-digital conversion circuit is used to perform analog-to-digital conversion on the synchronization signal. Preferably, the sensor is a voltage sensor or a current sensor.

[0025] Preferably, the signal acquisition circuit further includes an anti-aliasing filter circuit, which is arranged between the analog-to-digital conversion circuit and the signal processing circuit, and is electrically connected to the analog-to-digital conversion circuit and the signal processing circuit, respectively. The anti-aliasing filter circuit filters out interference, which can improve the accuracy of subsequent detection.

[0026] The working process is: electrically connect the end electrical test equipment to the power supply end of the line under test, detect the positive and negative polarities of the power supply end through the polarity detection circuit to assist in line finding, generate a synchronization signal through the signal generation circuit, and couple the synchronization signal to the line under test; then, electrically connect the front-end signal processing equipment to other positions (detection points) of the line under test, the signal acquisition circuit captures the synchronization signal in the line under test, and then performs analog-to-digital conversion, filtering and other processing on the synchronization signal, the signal processing circuit detects the energy value of the captured synchronization signal, and the signal display screen is used to display the energy value of the synchronization signal. The operator can determine whether the detection point and the power supply end are on the same line based on the energy value, thereby realizing cable line finding and improving the accuracy of line finding.

[0027] It should be noted that the prior art already has circuits capable of performing positive and negative polarity detection, signal generation, and signal energy value detection. The polarity detection circuit, signal generating circuit, and signal processing circuit in this embodiment can all adopt existing related circuits. Based on the information such as the composition structure and the functions of each part disclosed in the present invention, the technology in this field can realize the device selection and wiring of these circuits without creative labor. Therefore, this embodiment no longer describes the specific structures of the polarity detection circuit, signal generating circuit, and signal processing circuit one by one.

[0028] Preferably, the terminal electrical testing equipment also includes an anti-reverse connection circuit, the input end of the anti-reverse connection circuit is electrically connected to the output end of an external DC power supply through a power supply interface, and the output end of the anti-reverse connection circuit is electrically connected to the power supply ends of the polarity detection circuit and the signal generating circuit, respectively.

[0029] Preferably, Figure 3 As shown, the anti-reverse connection circuit includes a bridge rectifier circuit, a current limiting circuit and a voltage stabilizing circuit. The first input end of the bridge rectifier circuit is connected to the positive power input end of the power interface, the second input end of the bridge rectifier circuit is connected to the negative power input end of the power interface, the negative output end of the bridge rectifier circuit is grounded, the positive output end of the bridge rectifier circuit is respectively connected to the power supply end of the current limiting circuit, the signal generating circuit and / or the polarity detection circuit, the output end of the current limiting circuit is connected to the input end of the voltage stabilizing circuit, and the voltage stabilizing circuit is also electrically connected to the signal generating circuit and / or the polarity detection circuit.

[0030] In this embodiment, a bridge rectifier circuit is used to solve the reverse connection problem, so that the terminal test equipment 20 can still work normally even when reversely connected; in addition, a current limiting circuit is provided to prevent a short circuit from affecting the base station when the internal circuit of the terminal test equipment 20 fails.

[0031] Preferably, the voltage stabilizing circuit includes a first-stage voltage stabilizing circuit and a second-stage voltage stabilizing circuit, the input end of the second-stage voltage stabilizing circuit is connected to the output end of the current limiting circuit via the first-stage voltage stabilizing circuit, the first-stage voltage stabilizing circuit is electrically connected to the signal generating circuit and / or the polarity detecting circuit, and the second-stage voltage stabilizing circuit is electrically connected to the signal generating circuit and / or the polarity detecting circuit. The anti-reverse connection circuit also includes a first state indicating circuit and a second state indicating circuit, the first state indicating circuit is connected to the current limiting circuit, and the second state indicating circuit is respectively connected to the positive power input end and the negative power input end of the power interface.

[0032] like Figure 4 As shown, the bridge rectifier circuit includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the cathode of the first diode D1 and the cathode of the second diode D2 are connected to form a positive output end of the bridge rectifier circuit, the anodes of the third diode D3 and the fourth diode D4 are connected to form a negative output end of the bridge rectifier circuit, the cathode of the third diode D3 is connected to the anode of the first diode D1 to form a first input end of the bridge rectifier circuit, and the cathode of the fourth diode D4 is connected to the anode of the second diode D2 to form a second input end of the bridge rectifier circuit. Preferably, the input power supply of the terminal test equipment 20 is a 48V DC power supply.

[0033] The second state indicating circuit includes an eighth diode D8, a ninth diode D9, a tenth diode D10, an eleventh diode D11, a twelfth resistor R12 and a thirteenth resistor R13. The eighth diode D8 and the tenth diode D10 are both light emitting diodes. The cathode of the eighth diode D8 is connected to the positive power input terminal of the power interface via the twelfth resistor R12, the anode of the eighth diode D8 is connected to the negative power input terminal of the power interface, the anode of the ninth diode D9 is connected to the cathode of the eighth diode D8 and the positive power input terminal of the power interface, the cathode of the ninth diode D9 is connected to the anode of the eighth diode D8 and the negative power input terminal of the power interface, the anode of the tenth diode D10 is connected to the positive power input terminal of the power interface, the cathode of the tenth diode D10 is connected to the negative power input terminal of the power interface via the thirteenth resistor R13, the cathode of the eleventh diode D11 is connected to the anode of the tenth diode D10 and the positive power input terminal of the power interface, and the anode of the eleventh diode D11 is connected to the cathode of the tenth diode D10 and the negative power input terminal of the power interface. When the terminal electrical test device 20 is forwardly connected, the tenth diode D10 lights up and the eighth diode D8 goes out; when the terminal electrical test device 20 is reversely connected, the eighth diode D8 lights up and the tenth diode D10 goes out; thus, it is convenient to understand whether the terminal electrical test device 20 is reversely connected.

[0034] The current limiting circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first transistor Q1 and a thyristor Q2, wherein the fourth resistor R4 is an adjustable resistor, the emitter of the first transistor Q1 is connected to the positive output end of the bridge rectifier circuit via the first resistor R1, the emitter of the first transistor Q1 is connected to the base of the first transistor Q after passing through the second resistor R2 and the third resistor R3 in sequence, the collector of the first transistor Q1 is grounded via the fourth resistor R4, the anode of the thyristor Q2 is connected to the common point of the second resistor R2 and the third resistor R3, the cathode of the thyristor Q2 is grounded, and the gate of the thyristor Q2 is connected to the adjustment end of the fourth resistor R4. Preferably, the first transistor Q1 is a PNP transistor.

[0035] The first state indicating circuit includes a seventh diode D7 and an eleventh resistor R11, the seventh diode D7 is a light emitting diode, the anode of the seventh diode D7 is connected to the common point of the second resistor R2 and the third resistor R3, and the cathode of the seventh diode D7 is connected to the anode of the thyristor Q2 via the eleventh resistor R11.

[0036] The first voltage stabilizing circuit includes a second transistor T1, a fifth resistor R5, a sixth resistor R6, a fifth diode D5, a sixth diode D6 and a first capacitor C1, the sixth diode D6 is a voltage stabilizing diode, the base of the second transistor T1 is grounded via the first capacitor C1, the emitter of the second transistor T1 is connected to the signal generating circuit and / or the polarity detecting circuit, the collector of the second transistor T1 is connected to the base of the second transistor T1 via the fifth resistor R5, the sixth resistor R6 is connected in parallel with the fifth resistor R5, the collector of the second transistor T1 is connected to the common point of the second resistor R2 and the third resistor R3, the anode of the fifth diode D5 is connected to the base of the second transistor T1, and the cathode of the fifth diode D5 is connected to the anode of the thyristor Q2. Preferably, the model of the second transistor T1 is BD237.

[0037] The second voltage stabilizing circuit includes a voltage stabilizing chip U1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an inductor L, the positive electrode of the second capacitor C2 is connected to the signal generating circuit and / or the polarity detecting circuit, the negative electrode of the second capacitor C2 is grounded, the third capacitor C3 is connected in parallel with the second capacitor C2, the enabling end of the voltage stabilizing chip U1 is connected to the signal generating circuit and / or the polarity detecting circuit via the seventh resistor R7, the compensation end of the voltage stabilizing chip U1 is connected to the signal generating circuit and / or the polarity detecting circuit via the eighth resistor R8 and the fourth resistor R9 in sequence. The capacitor C4 is grounded, the analog ground terminal and the protection ground terminal of the voltage stabilizing chip U1 are both grounded, the output terminal of the voltage stabilizing chip U1 is connected to the signal generating circuit and / or the polarity detection circuit via the inductor L, the positive electrode of the fifth capacitor C5 is connected to the signal generating circuit and / or the polarity detection circuit, the negative electrode of the fifth capacitor C5 is grounded, the sixth capacitor C6 is connected in parallel with the fifth capacitor C5, one end of the ninth resistor R9 is connected to the signal generating circuit and / or the polarity detection circuit, the other end of the ninth resistor R9 is grounded via the tenth resistor R10, and the feedback terminal of the voltage stabilizing chip U1 is connected to the common point of the ninth resistor R9 and the tenth resistor R10. Preferably, the model of the voltage stabilizing chip U1 is AOZ1016.

[0038] The working principle of this embodiment is as follows: initially, the first transistor Q1 and the thyristor Q2 are both turned off. When the voltage at the first resistor R1 increases, the first transistor Q1 is turned on, and then the thyristor Q2 is turned on, thereby playing a role of current limiting protection.

[0039] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A line inspection instrument for DC power supply equipment, characterized in that: It comprises a terminal electrical test device and a front-end signal processing device which are separately arranged; the terminal electrical test device comprises a polarity detection circuit and a signal generating circuit, the polarity detection circuit and the signal generating circuit are both electrically connected to the power supply end of the circuit under test, the front-end signal processing device comprises a signal acquisition circuit, a signal processing circuit and a display screen which are electrically connected in sequence, the signal acquisition circuit is also electrically connected to the circuit under test, the signal acquisition circuit comprises a sensor and an analog-to-digital conversion circuit, the sensor is electrically connected to the analog-to-digital conversion circuit and the circuit under test respectively, and the analog-to-digital conversion circuit is also electrically connected to the signal processing circuit; The signal acquisition circuit further includes an anti-aliasing filter circuit, which is arranged between the analog-to-digital conversion circuit and the signal processing circuit, and is electrically connected to the analog-to-digital conversion circuit and the signal processing circuit respectively; The working process of the DC power supply equipment line inspection instrument is as follows: the terminal power test equipment is electrically connected to the power supply end of the line under test, the positive and negative polarities of the power supply end are detected by a polarity detection circuit to assist line finding, a synchronization signal is generated by a signal generation circuit, and the synchronization signal is coupled to the line under test; Then, the front-end signal processing device is electrically connected to other positions of the line under test, the signal acquisition circuit captures the synchronization signal in the line under test, and then performs analog-to-digital conversion and filtering on the synchronization signal. The signal processing circuit detects the energy value of the captured synchronization signal, and the signal display screen is used to display the energy value of the synchronization signal. The operator can determine whether the detection point and the power supply end are on the same line based on the energy value, thereby realizing cable tracking; The terminal electrical test device also includes an anti-reverse connection circuit, the input end of the anti-reverse connection circuit is electrically connected to the output end of the external DC power supply through the power supply interface, and the output end of the anti-reverse connection circuit is electrically connected to the power supply end of the polarity detection circuit and the signal generating circuit respectively; The anti-reverse connection circuit includes a bridge rectifier circuit, a current limiting circuit and a voltage stabilizing circuit. The first input end of the bridge rectifier circuit is connected to the positive power input end of the power interface, the second input end of the bridge rectifier circuit is connected to the negative power input end of the power interface, the negative output end of the bridge rectifier circuit is grounded, the positive output end of the bridge rectifier circuit is respectively connected to the power supply end of the current limiting circuit, the signal generating circuit and / or the polarity detection circuit, the output end of the current limiting circuit is connected to the input end of the voltage stabilizing circuit, and the voltage stabilizing circuit is also electrically connected to the signal generating circuit and / or the polarity detection circuit.

2. The DC power supply equipment line patrol instrument according to claim 1, characterized in that: The front-end signal processing device block also includes: a power supply, which is electrically connected to the signal acquisition circuit, the signal processing circuit and the display screen respectively.

3. The DC power supply equipment line patrol instrument according to claim 1, characterized in that: The sensor is a voltage sensor or a current sensor.

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