CN112394273A - Circuit inspection system and method - Google Patents
Circuit inspection system and method Download PDFInfo
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- CN112394273A CN112394273A CN201910740706.4A CN201910740706A CN112394273A CN 112394273 A CN112394273 A CN 112394273A CN 201910740706 A CN201910740706 A CN 201910740706A CN 112394273 A CN112394273 A CN 112394273A
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2839—Fault-finding or characterising using signal generators, power supplies or circuit analysers
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Abstract
The invention provides a circuit checking system and a circuit checking method, which comprise the following steps: a signal generator connected to the input end of the line to be tested for generating a modulation signal; the signal detector is connected to the output end of the line to be detected and used for demodulating the output signal of the line to be detected; and the signal blocker is at least arranged between the input end of the line to be detected and the input signal of the circuit to prevent the modulation signal from running out of the line to be detected. Blocking a line to be tested under the condition of power-on or power-off; applying a modulation signal to an input end of a line to be tested; demodulating an output signal of a line to be detected; and judging whether the line to be detected has a fault or not based on the demodulated signal obtained after demodulation. The invention uses the blocker to block the area, adds the high-frequency modulation signal on line, can quickly find the component with misoperation, accurately searches the fault source, and greatly reduces the workload; the invention is suitable for power circuit detection with frequency lower than 100Hz and voltage lower than 400V, and has high efficiency and convenient operation.
Description
Technical Field
The invention relates to the field of circuit safety maintenance, in particular to a circuit inspection system and a circuit inspection method.
Background
With the progress of science and technology, electronic circuits have penetrated into the aspects of our daily lives; and as the functions realized by the electronic circuit are more and more, the electronic circuit comprises more and more devices, and the connecting line is more and more complicated. In case of a fault of the electronic circuit, the faulted device needs to be searched through maintenance and replaced to ensure normal and stable work of circuit equipment, and the complex circuit structure brings greater difficulty to circuit maintenance.
In circuit maintenance, power-off detection and power-on detection are generally divided. The power failure detection is to detect the power failure of the whole circuit, so that the circuit can only be checked for the presence or absence of the power failure, and the working state of the circuit cannot be detected. The power-on detection is carried out in a working state, so that the voltage can be detected, but the position of the power-on detection is not known definitely, and the power-on detection is not a signal line to be checked; resulting in poor maintenance accuracy and large workload.
Therefore, how to implement circuit maintenance in power-on and power-off states and improve maintenance accuracy has become one of the problems to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a circuit inspection system and method for solving the problems of poor circuit inspection accuracy, large workload, etc. in the prior art.
To achieve the above and other related objects, the present invention provides a circuit line inspection system, comprising:
the signal generator is connected with the input end of a line to be detected in the circuit and used for generating a modulation signal for detection;
the signal detector is connected to the output end of the line to be detected and used for receiving the output signal of the line to be detected and demodulating the output signal of the line to be detected;
and the signal blocker is at least arranged between the input end of the line to be detected and the input signal of the circuit to prevent the modulation signal from running out of the line to be detected.
Optionally, the signal generator includes a modulation module, and the modulation module receives a power signal and a modulation signal, and modulates the power signal and the modulation signal to obtain the modulation signal.
More optionally, the signal detector includes a demodulation module, where the demodulation module receives the output signal of the line to be detected, and demodulates the output signal of the line to be detected into a power signal and a demodulated signal.
Optionally, the signal blocker includes a dc blocking module and an ac blocking module.
Optionally, the signal blocker is further disposed between the output end of the line to be tested and the output signal of the circuit, so as to prevent the modulation signal from exiting the line to be tested.
To achieve the above and other related objects, the present invention provides a circuit line-checking method, which at least comprises:
blocking a line to be tested under the condition of power-on or power-off;
applying a modulation signal to the input end of the line to be tested;
detecting an output signal of the line to be detected, and demodulating the output signal of the line to be detected;
and judging whether the line to be detected has a fault or not based on the demodulated signal obtained after demodulation.
Optionally, the power signal and the modulation signal are modulated to obtain the modulation signal.
More optionally, the frequency of the power signal is less than 100Hz, and the voltage is less than 400V.
More optionally, the frequency of the modulation signal is greater than 100Hz and less than 10 KHz.
As described above, the circuit line inspection system and method of the present invention have the following advantages:
the circuit line-checking system and the method thereof use the blocker to block the area, add the high-frequency modulation signal on line, and know the trend of the signal through the detection of the output signal in the maintenance range, thereby being capable of knowing the related components on the line, quickly finding the components with false actions, accurately searching the fault source and greatly reducing the workload.
The line inspection system and the line inspection method of the circuit are suitable for power circuit detection with the frequency lower than 100Hz and the voltage lower than 400V, and have the advantages of high efficiency and convenient operation.
Drawings
FIG. 1 is a schematic diagram of a circuit line inspection system according to the present invention.
FIG. 2 is a schematic diagram of another circuit configuration of a line inspection system of the present invention.
Description of the element reference numerals
1 circuit line inspection system
11 Signal generator
12 Signal detector
131 first signal blocker
132 second signal blocker
2 first function Module
3 second function Module
4 third function module
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1-2. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Example one
As shown in fig. 1, the present embodiment provides a circuit line inspection system 1, where the circuit line inspection system 1 includes:
a signal generator 11, a signal detector 12 and a first signal blocker 131.
As shown in fig. 1, the signal generator 11 is connected to an input end of a line to be detected in the circuit, and generates a modulation signal for detection.
Specifically, in this embodiment, the line to be tested includes a signal line formed by sequentially connecting the first functional module 2 and the second functional module 3. In actual need, the lines to be tested (including different functions and numbers) may be defined according to the components to be tested, which is not limited to this embodiment. In this embodiment, the signal generator 11 is connected to an input terminal of the first functional module 2. The line to be tested is a part of the circuit, and for convenience of display, the structure of the circuit is not completely shown in fig. 1, and the circuit structures with different functions are different, which are not listed herein.
Specifically, the signal generator 11 includes a modulation module, and in this embodiment, the modulation module receives a power signal and a modulation signal, and modulates the power signal and the modulation signal to obtain the modulation signal. In this embodiment, the line inspection system 1 of the circuit is applied to a power circuit, the power signal is used as a carrier signal, the frequency of the power signal is less than 100Hz, and the voltage is less than 400V. In practical applications, the carrier signal may be specifically set based on a specific circuit, which is not limited to this embodiment. The modulation signal is a high-frequency signal, in this embodiment, the frequency of the modulation signal is greater than 100Hz and less than 10KHz, and in actual use, the frequency of the modulation signal does not coincide with the frequency of the carrier signal and the frequency of the electromagnetic interference, which is not limited in this embodiment.
It should be noted that any circuit structure capable of implementing signal modulation is suitable for the modulation module of the present invention, and is not repeated herein.
As shown in fig. 1, the signal detector 12 is connected to the output end of the line to be tested, and is configured to receive the output signal of the line to be tested and demodulate the output signal of the line to be tested.
Specifically, the signal detector 12 includes a demodulation module, and in this embodiment, the demodulation module receives the output signal of the line to be tested, and demodulates the output signal of the line to be tested into a power signal and a demodulation signal. The output signal of the line to be tested is the output signal of the modulation signal after passing through the functional module, based on different functional modules, the output signal of the line to be tested and the modulation signal show corresponding relations, and whether the line to be tested has a fault can be judged based on the corresponding relations. In this embodiment, the modulation signal passes through the first functional module 2 and the second functional module 3 to obtain the output signal of the line to be tested.
It should be noted that any circuit structure capable of implementing signal demodulation is applicable to the demodulation module of the present invention, and is not repeated herein.
As shown in fig. 1, the first signal blocker 131 is at least disposed between the input end of the line under test and the input signal of the circuit to prevent the modulation signal from exiting the line under test.
Specifically, the first signal blocker 131 includes a dc blocking module and an ac blocking module, and is configured to block dc signals and ac signals flowing into the line to be tested and not used for testing.
Specifically, as an implementation manner of the present invention, as shown in fig. 1, the first signal blocker 131 is disposed at the input end of the first functional module 2, and is configured to prevent the modulation signal from running out of the line to be tested, so as to influence the working states of other lines; and simultaneously, other signals except the modulated signal are blocked from entering the first functional module 2, so that the test result is prevented from being influenced.
Specifically, as another implementation manner of the present invention, the first signal blocker 131 may be disposed in front of any module that is located in front of the first functional module 2 on the signal trace, as long as the operation of other branches is not affected.
It should be noted that the first signal blocker 131 may be disposed at any position between the input end of the line to be tested and the input signal (not shown) of the circuit as required to prevent the modulation signal from escaping from the line to be tested, and the specific position is not limited.
Example two
As shown in fig. 2, the present embodiment provides a circuit trace-checking system, which is different from the first embodiment in that the circuit trace-checking system further includes a second signal blocker 132.
As shown in fig. 2, the second signal blocker 132 is disposed between the output end of the line under test and the output signal of the circuit to prevent the modulated signal from escaping from the line under test.
Specifically, as an implementation manner of the present invention, as shown in fig. 2, in this embodiment, an output end of the line to be tested (i.e. an output end of the second functional module 3) is connected to a third functional module 4, and the second signal blocker 132 is connected to an output end of the third functional module 4 to prevent the modulation signal from exiting the line to be tested and further affecting working states of other lines; and simultaneously blocking the influence of other signals at the output end of the line to be tested on the line to be tested. If a branch exists, the branch and the line to be tested are two independent wires, and the output end of the branch is connected with the output end of the third functional module 4 and then is used as the input signal of the next-stage module, then if the second signal blocker 132 is not present, the output signal of the line to be tested may enter the branch, and further the working state of the branch is affected; meanwhile, the output signal of the branch circuit influences the line to be detected, and further influences the detection result.
Specifically, as another implementation manner of the present invention, the second signal blocker 132 is connected to the output end of the second functional module 3 to prevent the modulated signal from exiting the line to be tested.
It should be noted that the second signal blocker 132 may be disposed at any position between the output end of the line to be tested and the output signal (not shown) of the circuit as required to prevent the modulation signal from escaping from the line to be tested, and the specific position is not limited.
EXAMPLE III
The present embodiment provides a circuit line inspection method, which includes:
blocking a line to be tested under the condition of power-on or power-off;
applying a modulation signal to the input end of the line to be tested;
detecting an output signal of the line to be detected, and demodulating the output signal of the line to be detected;
and judging whether the line to be detected has a fault or not based on the demodulated signal obtained after demodulation.
The method specifically comprises the following steps:
1) and determining a line to be tested, and blocking the line to be tested under the condition that the circuit is powered on or powered off.
Specifically, the method for blocking the line to be tested comprises the following steps: if the output stage of the circuit to be tested does not include other branches (the output signal of the circuit to be tested directly determines the output signal of the circuit, the output signal of the circuit is irrelevant to other signals), the modulation signal can be prevented from running out of the circuit to be tested by arranging a first signal blocker, and the first signal blocker is arranged between the input end of the circuit to be tested and the input signal of the circuit to realize the isolation of the circuit to be tested and other signals in the circuit. If the output stage of the circuit that awaits measuring includes other tributaries, then the accessible sets up first signal blocker and second signal blocker and prevents the modulation signal from running out the circuit that awaits measuring, first signal blocker set up in the input of the circuit that awaits measuring with between the input signal of circuit, second signal blocker set up in the output of the circuit that awaits measuring with between the output signal of circuit.
2) And modulating the carrier signal and the modulation signal to obtain the modulation signal, and loading the modulation signal to the input end of the line to be tested.
Specifically, in this embodiment, the circuit trace checking method is applied to troubleshooting of a power circuit, where a power signal is used as the carrier signal, the frequency of the power signal is less than 100Hz, and the voltage is less than 400V. In practical applications, the carrier signal may be specifically set based on a specific circuit, which is not limited to this embodiment. The modulation signal is a high-frequency signal, in this embodiment, the frequency of the modulation signal is greater than 100Hz and less than 10KHz, and in actual use, the frequency of the modulation signal does not coincide with the frequency of the carrier signal and the frequency of the electromagnetic interference, which is not limited in this embodiment.
3) And the modulation signal is output after passing through each functional module in the line to be detected, and the output signal of the line to be detected is demodulated.
Specifically, in this embodiment, the output signal of the line under test is demodulated to obtain a power signal and a demodulated signal.
4) The output signal of the line to be tested is the output signal of the modulation signal after passing through the functional module, based on different functional modules, the output signal of the line to be tested and the modulation signal show corresponding relations, and whether the line to be tested has a fault can be judged based on the corresponding relations.
It should be noted that the circuit line inspection method is applicable to any circuit that needs to be subjected to line inspection, and is not limited to this embodiment. Any hardware or software that can implement the circuit line-checking method of the present invention is suitable for the present invention, including but not limited to the devices listed in the first embodiment or the second embodiment.
In summary, the present invention provides a circuit inspection system and method, including: the signal generator is connected with the input end of a line to be detected in the circuit and used for generating a modulation signal for detection; the signal detector is connected to the output end of the line to be detected and used for receiving the output signal of the line to be detected and demodulating the output signal of the line to be detected; and the signal blocker is at least arranged between the input end of the line to be detected and the input signal of the circuit to prevent the modulation signal from running out of the line to be detected. Blocking a line to be tested under the condition of power-on or power-off; applying a modulation signal to the input end of the line to be tested; detecting an output signal of the line to be detected, and demodulating the output signal of the line to be detected; and judging whether the line to be detected has a fault or not based on the demodulated signal obtained after demodulation. The circuit line-checking system and the method of the invention use the blocker to block the area, add the high-frequency modulation signal on line, and get the trend of the signal through the detection of the output signal in the maintenance range, thereby getting the related components on the line, quickly finding the components with false actions, accurately checking the fault source, and greatly reducing the workload; the circuit line checking system and the circuit line checking method are suitable for detecting the power circuit with the frequency lower than 100Hz and the voltage lower than 400V, and have high efficiency and convenient operation. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A circuit line-checking system, comprising:
the signal generator is connected with the input end of a line to be detected in the circuit and used for generating a modulation signal for detection;
the signal detector is connected to the output end of the line to be detected and used for receiving the output signal of the line to be detected and demodulating the output signal of the line to be detected;
and the signal blocker is at least arranged between the input end of the line to be detected and the input signal of the circuit to prevent the modulation signal from running out of the line to be detected.
2. A line inspection system for a circuit according to claim 1, wherein: the signal generator comprises a modulation module, and the modulation module receives a power supply signal and a modulation signal and modulates the power supply signal and the modulation signal to obtain the modulation signal.
3. A line inspection system for a circuit as claimed in claim 1 or 2, wherein: the signal detector comprises a demodulation module, wherein the demodulation module receives the output signal of the line to be detected and demodulates the output signal of the line to be detected into a power signal and a demodulation signal.
4. A line inspection system for a circuit according to claim 1, wherein: the signal blocker comprises a direct current blocking module and an alternating current blocking module.
5. A line inspection system for a circuit according to claim 1, wherein: the signal blocker is also arranged between the output end of the line to be detected and the output signal of the circuit to prevent the modulation signal from running out of the line to be detected.
6. A circuit line inspection method, comprising:
blocking a line to be tested under the condition of power-on or power-off;
applying a modulation signal to the input end of the line to be tested;
detecting an output signal of the line to be detected, and demodulating the output signal of the line to be detected;
and judging whether the line to be detected has a fault or not based on the demodulated signal obtained after demodulation.
7. The circuit line inspection method of claim 6, wherein: and modulating the power supply signal and the modulation signal to obtain the modulation signal.
8. The circuit line inspection method of claim 7, wherein: the frequency of the power supply signal is less than 100Hz, and the voltage is less than 400V.
9. The circuit line inspection method of claim 7 or 8, wherein: the frequency of the modulation signal is more than 100Hz and less than 10 KHz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910740706.4A CN112394273B (en) | 2019-08-12 | 2019-08-12 | Circuit inspection system and method |
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|---|---|---|---|
| CN201910740706.4A CN112394273B (en) | 2019-08-12 | 2019-08-12 | Circuit inspection system and method |
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| CN112394273A true CN112394273A (en) | 2021-02-23 |
| CN112394273B CN112394273B (en) | 2023-03-24 |
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