JP6096330B2 - Apparatus and method for investigating cable systems - Google Patents

Description

  The present invention is to support the use of survey signals to survey a cable system having a cable and a load including a rectifier circuit having an input coupled to the cable and an output coupled to a storage circuit. Relates to the device.

  The invention further relates to a package system, a cable system, a method, a computer program product, and a medium.

  Examples of such loads are lamps, electrical equipment, computers and telecommunications equipment. Examples of such cables are power cables and telecommunications cables.

  CN 101635077 A is an anti-theft detection method for road lamp cables, in which a survey signal in the form of a variable frequency input current signal is injected into the road lamp cable and for the input current signals of different frequencies Discloses a method in which the output current signal and the output voltage signal are measured, the resonant frequency of the road lamp is taken into account, and many actual road lamps need to be known. In this way, road lamp cables can be monitored in a relatively complex manner.

  The cable system has a cable and one or more loads. If the load has a rectifier circuit with an input coupled to the cable and an output coupled to the storage circuit, the storage circuit may have a relatively large effect on the survey signal and uses the survey signal. It may make it difficult or even impossible.

  An object of the present invention supports the use of survey signals to survey a cable system having a cable and a load including a rectifier circuit with an input coupled to the cable and an output coupled to a storage circuit. It is to provide an apparatus for the above. Another object of the present invention is to provide a package system, a cable system, a method, a computer program product, and a medium.

  According to a first aspect, the use of a survey signal for surveying a cable system comprising a cable and a load comprising a rectifier circuit comprising an input coupled to the cable and an output coupled to a storage circuit. A device for supporting, a charging circuit for generating a charge signal for charging the storage circuit, a survey circuit 3 for generating a survey signal, and the survey circuit 3 generating the survey signal There is provided an apparatus having a control circuit 4 for controlling the charging circuit 1 to generate the charging signal before performing.

  The charged storage circuit at least reduces the effect on the performance of the survey signal compared to the uncharged storage circuit.

The cable system has a cable and one or more loads. The load includes a rectifier circuit having an input coupled to the cable and an output coupled to a storage circuit. A survey signal is generated to survey the cable system. A first example of such a survey signal is a load that is reflected by an “open circuit” or “short circuit” in the cable, or that does not function properly or a fuse breakage between the load and the cable, etc. A pulse signal that is activated in response to a fault at or near the load and is reflected by a signal circuit that changes the impedance of the cable system at the load when activated. The time between the transmission of the pulse and the receipt of the response multiplied by the speed of the pulse through the cable, divided by 2, indicates the location of the fault. A second example of a survey signal is to inject several signals of several frequencies into the cable, whereby the responses are measured and the characteristic frequency is calculated from these responses. Differences between the recently calculated characteristic frequency and the reference characteristic frequency as calculated immediately after installation, such as "open" or "short circuit" in the cable, or faults that result in activation of the signal circuit, etc. Indicate failure. Given the characteristics of the cable and possible signal circuits, the location of the fault can be derived from the recently calculated characteristic frequency. When a signal circuit having a signal capacitor having a capacitance value C is activated, the characteristic frequency f _char is 1 as a product of 2, π, the route of the capacitance value C, and the inductance value L. It will be equal to the divided one. Due to the fact that the characteristic frequency f _char can be measured and the capacitance value C of the signal capacitor is known, the inductance value L can be calculated from this equation. In this way, the value of the inductance L of the cable can be derived. Considering the fact that the inductance value per unit distance of the cable is defined by the specification, the derived value indicates the location of the fault.

  The storage circuit may absorb the survey signal and generate an undesirable response to such a survey signal. In both cases, the storage circuit has a relatively large impact on the performance of the survey signal, and the survey of the cable system can be hindered by these storage circuits. By adding a charging circuit for generating a charging signal for charging the storage circuit, the charged storage circuit has an effect on the performance of the survey signal compared to the uncharged storage circuit. Will at least reduce. As a result, even in the presence of a load comprising a rectifier circuit and a storage circuit, the cable system can be investigated, which is a great advantage. By way of example only, the storage circuit may include, for example, a storage capacitor.

  An embodiment of the device is defined in that at least reducing the influence is to make no influence at all. Preferably, the charged storage circuit will have no effect on the performance of the survey signal. In contrast, the storage circuit should be fully charged.

  An embodiment of the device defines that the voltage amplitude of the survey signal is less than or equal to the sum of the voltage amplitude present at both ends of the rectifier circuit and the voltage amplitude present at both ends of the charged storage circuit. Is done. By way of example only, if the voltage amplitude of the survey signal is less than or equal to the sum of the voltage amplitude present at both ends of the rectifier circuit and the voltage amplitude present at both ends of the charged storage circuit, it is charged. The storage circuit will have no effect on the performance of the survey signal.

  In an embodiment of the device, the cable system further comprises a signal circuit located between the load and the cable, so that the device discharges the signal circuit after being charged by the charging circuit. It is prescribed | regulated by having further a discharge circuit. Activated in response to detection of a fault in or near the load, and in activation mode, a signal circuit configured to change the impedance of the cable at the position of the load is provided between the load and the cable. If present in between, the signal circuit may be overcharged by the charging circuit. In order to prevent the occurrence of the charged storage circuit being no longer visible to the probe signal because it is charged, the signal circuit should be discharged before the probe signal is generated. It is. The discharge is realized through the discharge circuit. At the load, the rectifier circuit will prevent the storage circuit from being excessively discharged by the discharge circuit. By way of example only, a signal circuit may include a signal capacitor connected to the cable, for example, in response to detecting a fault at or near the load.

  An embodiment of the device is defined by further comprising a survey circuit for generating the survey signal and a control circuit for controlling the charging circuit and the survey circuit. Examples of the investigation circuit are a generator, a swept-tuned-analyzer and a fast Fourier transform analyzer. Examples of the control circuit are a controller and a processor. The function of the investigation circuit can be realized via the control circuit. The control circuit may, for example, firstly switch the charging circuit on, then switch off, and secondly switch the discharge circuit on, then switch off, 3. The charging circuit, the discharging circuit, and the investigation circuit are controlled so that the investigation circuit is turned on and then turned off.

  An embodiment of the apparatus analyzes a response in consideration of the survey signal and a receiving circuit for receiving a response to the survey signal, and determines a fault and / or a location of the fault according to the analysis result And further comprising an analysis circuit for defining. An example of the receiving circuit is a receiver. An example of the analysis circuit is a computer. The receiving circuit and / or the analyzing circuit may form part of the survey circuit. The functions of the reception circuit and / or the analysis circuit can be realized via the control circuit. The control circuit may be, for example, firstly the research circuit and the receiving circuit are switched on and then switched off, and secondly the analysis circuit is switched on and then switched off. The investigation circuit, the reception circuit, and the analysis circuit are controlled so as to be switched. In other examples, they are all switched on during the same time interval.

  According to a second aspect, there is provided a packaging system comprising an apparatus as defined above and further comprising another apparatus comprising a survey circuit for generating the survey signal.

  According to a third aspect, there is a cable system comprising a cable and a load comprising a rectifier circuit comprising an input coupled to the cable and an output coupled to a storage circuit, as defined above A cable system is further provided having the apparatus.

  According to a fourth aspect, the use of a survey signal for surveying a cable system comprising a cable and a load comprising a rectifier circuit comprising an input coupled to the cable and an output coupled to a storage circuit. A method for supporting, the method comprising generating a charging signal for charging the storage circuit, wherein the method generates the survey signal after generating the charging signal. There is provided a method further comprising the step of:

  The charged storage circuit at least reduces the effect on the performance of the survey signal compared to the uncharged storage circuit.

  According to a fifth aspect, there is provided a computer program product for performing the method steps as defined above when running on a computer.

  According to a sixth aspect, there is provided a medium for storing and including a computer program product as defined above.

  The basic idea is that in a load having a rectifier circuit and an accumulator circuit, the accumulator circuit should be charged to make the accumulator circuit less visible / invisible to the survey signal.

  The problem of providing a device has been solved. Another advantage is that the device is simple, low cost and robust, and that many different types of cable systems can be investigated.

  These and other aspects of the invention are described and elucidated with reference to the following examples.

1 shows a cable system according to the prior art. Fig. 2 shows a device coupled to a cable system that is not functioning properly. An embodiment of the apparatus is shown. The load by a prior art is shown. The first situation is shown. The improved second situation is shown.

  In FIG. 1, a prior art cable system having a cable 101 and loads 111 to 115 is shown. Each load 111-115 is coupled to the first and second conductors of the cable 101 directly or indirectly through one or more elements not shown here or indirectly through a signal circuit. The loads 111 to 115 may be any type of load such as a lamp having one or more light emitting diodes. Other types of loads such as electrical equipment, computers and telecommunications equipment should not be excluded. In other examples, one of the conductors of the cable 101 may be disposed in another manner, for example, through the ground.

  In FIG. 2, device 10 is shown coupled to a cable system that is not functioning properly. The device 10 is coupled to the first and second conductors of the cable 101 directly or indirectly through one or more elements not shown here. The cable system includes a cable 101 and loads 113 to 115 coupled to first and second conductors of the cable 101 via signal circuits 123 to 125. Each signal circuit 123-125 is connected to the first and second conductors of the cable 101, for example, to change the impedance of the cable 101, and fault signals at or near the loads 113-115. In response to detection, it has a signal capacitor that is activated. In FIG. 2, a first fault 102 has occurred at or near the load 114, resulting in the signal circuit 124 being activated. In FIG. 2, a second failure 103 such as “open circuit” or “short circuit” occurs on one of the conductors of the cable 101 between the load 114 and the load 115.

  In FIG. 3, an embodiment of the device 10 is shown. The device 10 supports the use of survey signals to survey cable systems such as those shown in FIGS. 1 and 2, and loads 111-115 are each cable cables as further shown in FIG. 101 includes a rectifier circuit having an input coupled to 101 and an output coupled to a storage circuit. The device 10 has a charging circuit 1 for generating a charging signal for charging the storage circuit. If the cable system further comprises a signal circuit 121 arranged between the load 111 and the cable 101, the device 10 has a discharge circuit 2 for discharging the signal circuit 121 after being charged by the charging circuit 1. May further be included. The apparatus 10 may further include a survey circuit 3 for generating a survey signal and a control circuit 4 for controlling the other circuits 1 to 3. The apparatus 10 analyzes the response in consideration of the survey signal with the receiving circuit 5 for receiving the response to the survey signal, and determines the positions of the faults 102 and 103 and / or the faults 102 and 103 according to the analysis result. And an analysis circuit 6 for determining.

  The control circuit 4 can further control the receiving circuit 5, the analysis circuit 6, and the interface 7 for connecting to the circuits 1 to 6 on the one hand and to the cable 101 on the other hand. In other examples, one or more of the circuits 1 to 3, 5, 6 may be realized via the control circuit 4, or the control circuit 4 may be one of the circuits 1 to 3, 5, 6. May be integrated with one or more of Two or more of the circuits 1 to 6 may be combined into a larger circuit. If the circuits 1 to 6 do not require such an interface 7, the interface 7 can be omitted. Finally, the man machine interface may or may not exist.

  Accordingly, the device 10 is disposed at a central position relatively away from the loads 111 to 115 at the load position. 2 and 3, on the left side of the device 10, for example, there may be a generating device for generating cable signals for the loads 111-115. It may be necessary to isolate such generators or place them in an offside position before charging, discharging and investigating.

  In FIG. 4, a load 113 according to the prior art is shown. This load 113 according to the prior art has a rectifier circuit 201, for example a rectifier bridge with four diodes. An input unit of the rectifier circuit 201 is an input unit of the load 113. The output of the rectifier circuit 201 is coupled to the input of the DC-DC converter 203 and a storage circuit 202 such as one or more storage capacitors. The output of the DC-DC converter 203 is coupled to one or more light emitting diodes 204 of any kind and any combination.

  In cases where the fault 102 has occurred and the signal circuit 124 at the load 114 has been activated or the fault 103 has occurred between the loads 114 and 115, the device is connected via the investigation signal and its response. The characteristic frequency of the cable system as it should be measured by the 10 is appropriate due to the fact that the storage circuit 202 in the load 113 arranged between the device 10 and the load 114 can affect the measurement. May not be measured. Further, in one or more of the cases, the storage circuit 202 in the load 113 may absorb a survey signal in the form of a pulse signal as generated by the device 10 or reflect the survey signal too early. Might do. This is also reflected by the fact that no reflection will be generated (if the survey signal is absorbed by the storage circuit 202) or if it is reflected too early (if the survey signal is reflected by the storage circuit 202). Will result in inappropriate measurements.

  To solve this, before the survey signal is generated, the charging circuit 1 causes the charged storage circuit 202 to have at least a reduced impact on the performance of the survey signal compared to the uncharged storage circuit 202. However, a charging signal for charging the storage circuit 202 is preferably generated so that it will have no effect at all. By way of example only, the voltage amplitude present at both ends of the rectifier circuit 210 and the voltage amplitude present at both ends of the charged storage circuit 202 to realize that the voltage amplitude of the survey signal has no effect at all. Can be chosen to be less than or equal to the sum of

  In the case where the signal circuit 121 is present, it can also be charged by the charging circuit 1 if it has one or more signal capacitors. Due to the fact that the charged signal circuit 121 can also affect the survey signal, the signal circuit 121 may be configured to short-circuit the first and second conductors of the cable 101 before the survey signal is generated, for example. The discharge circuit 2 should be discharged.

  In FIG. 5, the survey signal in the form of a pulse signal is reflected by the uncharged storage circuit 202 in the load 113 before the pulse signal can reach the fault 104 in the form of a “short circuit” in the cable system. A first situation is shown.

  In FIG. 6 an improved second situation is shown in which the investigation signal in the form of a pulse signal is no longer reflected by the load 113 due to the fact that the storage circuit 202 in the load 113 is fully charged. Yes. As a result, the pulse signal can reach the fault 104 in the form of a “short circuit” in the cable system and is reflected by this “short circuit” so that appropriate measurements can be taken.

  In summary, the device 10 supports the use of survey signals to survey cable systems having cables 101 and loads 111. Load 111 has a rectifier circuit 201 coupled to storage circuit 202. The apparatus 10 has a charging circuit 1 for generating a charging signal for charging the storage circuit 202 so as to reduce the effect of the storage circuit 202 on the performance of the survey signal. The device 10 may further include a discharge circuit 2 for discharging the signal circuit 121 after being charged by the charging circuit 1. The apparatus 10 considers the survey signal, the survey circuit 3 for generating the survey signal, the control circuit 4 for controlling the other circuits 1 to 3, the receiving circuit 5 for receiving a response to the survey signal, and And the analysis circuit 6 for analyzing the response and determining the position of the obstacles 102 to 104 and / or the obstacles 102 to 104 according to the analysis result.

  While the invention is illustrated in the drawings and has been described in detail in the foregoing description, such illustration and description are to be considered illustrative and exemplary and limited Should not be considered. The invention is not limited to the disclosed embodiments. Those skilled in the art in practicing the claimed invention may understand and achieve other variations to the disclosed embodiments from a study of the drawings, the specification, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the singular form does not exclude the presence of a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims (10)

An apparatus for investigating a cable system having a cable and a load including a rectifier circuit having an input coupled to the cable and an output coupled to a storage circuit,
A charging circuit for generating a charging signal for charging the storage circuit;
A survey circuit for generating a survey signal;
A control circuit for controlling the charging circuit to generate the charging signal before the investigating circuit generates the investigating signal.   The apparatus according to claim 1, wherein a voltage amplitude of the investigation signal is equal to or less than a sum of a voltage amplitude existing at both ends of the rectifier circuit and a voltage amplitude existing at both ends of the charged storage circuit.   The cable system further comprises a signal circuit located between the load and the cable, and the device further comprises a discharge circuit for discharging the signal circuit after being charged by the charging circuit. Item 2. The apparatus according to Item 1. A receiving circuit for receiving a response to the survey signal;
The apparatus according to claim 1, further comprising an analysis circuit for analyzing the response in consideration of the survey signal and determining a fault and / or a position of the fault according to the analysis result.   A package system comprising the apparatus of claim 1 and further comprising another apparatus comprising a survey circuit for generating the survey signal.   A cable system comprising a cable and a load including a rectifier circuit having an input coupled to the cable and an output coupled to a storage circuit, the cable system further comprising the apparatus of claim 1.   A method for investigating a cable system having a cable and a load including a rectifier circuit having an input coupled to the cable and an output coupled to a storage circuit, the method comprising: Generating a charge signal for charging, the method further comprising generating a survey signal after the step of generating the charge signal.   The method according to claim 7, wherein a voltage amplitude of the investigation signal is equal to or less than a sum of a voltage amplitude existing at both ends of the rectifier circuit and a voltage amplitude existing at both ends of the charged storage circuit.   A computer program for performing the steps of the method of claim 7 when running on a computer.   A medium for storing and including the computer program of claim 9.

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