JP2005308734A - Electric monitor, and electric monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple electric monitor and electric monitoring method capable of conducting assistance for specifying a generation source of an electric change in a conductor, and capable of determining concretely a flow direction of the electric change. <P>SOLUTION: This electric monitor 1 is provided with an electric monitoring means 11 capable of determining the flow direction as to at least one portion of the electric change, by analyzing the electric changes in one side and the other side of the conductor 9, using as a boundary a filter 12 capable of changing at least one portion of the electric change intruded into the conductor 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical monitoring device and an electrical monitoring method capable of monitoring an electrical state on a conductive wire, in particular, a power supply line between a power supply and a load, specifically, a commercial power supply line.

  Known causes of an error in a personal computer (hereinafter referred to as “PC”) include power supply trouble, electromagnetic wave, hardware bug, software bug, and operation error. Among them, power troubles include power outages, instantaneous power outages, voltage shortages, power harmonics, high frequency noise, etc. PCs can be unrelated to power troubles as long as power is supplied from a commercial power source. The PC demands a high quality especially for the commercial power supply as compared with the conventional electric equipment. It is said that during the development of a PC, countermeasures against power supply troubles are taken before any other trouble countermeasures. In the present invention, the power trouble except for a part such as a power failure is generically called power noise.

  Power supply noise can occur indoors using a PC, and can also occur outdoors and enter the room. Examples of indoor sources include fluorescent lamps and laser printers, and the PC itself is also a source. There is also a report that a thyristor inverter in a factory, for example, has spread noise to surrounding households as an outdoor source. If the source of the power supply noise can be identified, an appropriate countermeasure can be taken, and if the PC causes an error even though the power supply noise is not detected, another cause can be obtained immediately.

  In general, in order to estimate the source of power supply noise, a method is known in which peripheral electrical devices are sequentially stopped to monitor whether the power supply noise is stopped. However, this method is complicated in proportion to the number of electrical devices. Moreover, the PC does not always exhibit the same symptom immediately after the occurrence of power supply noise. Conventional power supply noise monitoring devices are generally expensive. Therefore, there has been a demand for an apparatus and a method that can easily estimate the source of power supply noise.

  Therefore, the applicant of the present invention has previously applied for a patent for a technique that can determine the power flow direction of power supply noise in order to solve the above-described problem, that is, to assist in identifying the power supply noise generation source in the conductor ( Japan Patent Office, Japanese Patent Application No. 2003-344196, hereinafter referred to as “earlier application”). The present invention supplements the technical disclosure of the previous application and further adds technology.

  An object of the present invention is to provide a simple electric monitoring device and an electric monitoring method capable of assisting in identifying a source of an electrical change in a conducting wire, and capable of specifically determining a flow direction of the electrical change. Objective.

  In order to achieve the above object, in an electrical monitoring device capable of monitoring the electrical state of a conducting wire, both the one and the other electrical wires of the conducting wire are separated by a filter that can change at least a part of the electrical change of the conducting wire. An electrical monitoring means is provided that makes it possible to determine the flow direction for at least a part of the electrical change by analyzing the change.

  Further, in the electric monitoring device, each part generally provided in the PC, for example, a memory for storing data, a communication part such as a modem, an operation part such as a timer and a switch, an alarm part such as an LCD, a battery for supplying power to each part, and A control unit for controlling each unit is appropriately provided, and if the lead wire is a commercial power line, a voltage is further detected and automatic voltage switching means adapted to the voltage is provided.

  Next, in the electrical monitoring method for monitoring the electrical state of the conducting wire, the electrical change is analyzed by analyzing the electrical change of one and the other of the conducting wires with a filter that can change at least a part of the electrical change of the conducting wire as a boundary. The tidal direction can be determined for at least part of the change.

  By the way, the conducting wire is not limited to a commercial power supply line, and can be any energized wire such as a DC power supply line for an electric or electronic circuit, a communication cable, and does not need to be energized all the time. The electrical change is a change in electrical state, for example, instantaneous, stationary or periodic noise, and the electrical state is, for example, voltage, current, power, magnetic field strength or electric field strength, which is in the name “ It is not limited to “electricity”.

  In the electrical monitoring apparatus and electrical monitoring method of the present invention, the flow direction of electrical change can be determined for a frequency band in which the filter can change at least one of amplitude and phase, particularly in a frequency band where the amplitude can be reduced. Inexpensive filters are, for example, resistors, coils, and capacitors, and line filters that combine coils and capacitors are typical examples, but at least one of the amplitude and phase of electrical changes can be changed in at least some frequency bands. Any part is a candidate for a filter. For example, a normal mode filter and a common mode filter are appropriately selected according to the electrical change mode to be monitored. The two detection means that can detect the electrical state can be a contact type or a non-contact type with respect to the conductor. The filter and the detecting means 2 can be built in or separated from the electric monitoring device.

  In the electrical monitoring apparatus and electrical monitoring method of the present invention, in order to determine the flow direction of the power supply noise, first, the second detecting means detects one and the other electrical states of the conducting wire with the filter as a boundary, and then The monitoring means performs full-wave rectification on the difference value between the two electrical states and compares it with at least two upper and lower reference data (threshold values), while obtaining at least one of the positive and negative values of the electrical state. Each half wave is rectified and compared with predetermined reference data (threshold value), and each comparison result is synthesized.

  By the way, it is conceivable that an intended electrical state (normal component) is added to the conductive wire, and the electrical state is a mixture of normal component and noise. For example, if the conducting wire is a commercial power line and the normal component has a voltage waveform of 60 Hz, the normal component is removed by passing the detected instantaneous voltage through a high-pass filter in the electrical monitoring device and electrical monitoring method of the present invention. Make noise easier to detect.

The present invention has the following effects.
In the electrical monitoring apparatus and electrical monitoring method of the present invention, it is possible to assist in estimating the electrical changes in the conductors, particularly the source of power supply noise, and the user can take appropriate measures, such as PCs, audio / video devices, etc. Protects against harmful power supply noise. For example, it is possible to estimate the source of power supply noise by connecting the electrical monitoring device in the vicinity of all the electrical equipment that is assumed to be the source of power supply noise in order and monitoring for a predetermined time. Appropriate measures such as discontinuing use and connecting a noise filter can be considered. If the PC causes an error even though no power supply noise is detected, another cause can be obtained immediately. In addition, by incorporating the electrical monitoring means into the distribution board, it is possible to separate power noise that has entered from the outdoors and indoor power noise.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating an installation example of an electric monitoring device according to a first embodiment of the present invention, FIG. 2 is a principal block diagram of the electric monitoring device according to the first embodiment, and FIG. And a waveform example.

In FIG. 1, a conducting wire 9 is a commercial power supply line, and the electrical monitoring device 1 of the present invention is installed in contact with or non-contacting the conducting wire 9, and one of the conducting wires 9 is integrated with the electrical monitoring device 1 as a boundary. The impedance is Z _A 93 and the noise source E _A 91 is installed in contact or non-contact. Similarly, the impedance of the other conductor 9 is Z _B 94 and the noise source E _B 92 is in contact or non-contact. It shall be connected. The values of impedance Z _A 93, noise source E _A 91, impedance Z _B 94, and noise source E _B 92 are generally unknown.

  In the electrical monitoring device 1 of FIG. 2, a filter 12 that can change at least part of the electrical change of the conducting wire 9, and first detection means that can detect one electrical state of the conducting wire 9 with the filter 12 as a boundary. 13 and the second detection means 14 capable of detecting the other electrical state, and the electric monitoring means 11 capable of determining the flow direction with respect to at least a part of the electrical change by inputting and analyzing both electrical states. A memory 19 for storing data output by the electrical monitoring means 11, a liquid crystal display for alarming based on the data, an alarm unit 18 such as a speaker, an operation unit 17 for setting each unit and adjusting the time, and an external A communication unit 16 capable of wired or wireless communication with the device, and a control unit 84 that controls each unit, and further includes a timer (not shown), a battery that supplies power to each unit, and a battery that charges the battery. It has a like part. The two or more electrical monitoring devices 1 can each configure a network having a PC (not shown) as a host (monitor, controller) via the communication unit 16.

  In the electrical monitoring means 11 of FIG. 3, the first high-pass filtering means 21 filters low frequency components of the electrical change input from the first detection means 13, and the second high-pass filtering means 22 is input from the second detection means 14. Among the electrical changes, the low frequency component is filtered, the eleventh rectifying means 24 half-wave rectifies only the positive value of the electrical change input from the first high-pass filtering means 21, and the twelfth rectifying means 25 is the first rectifying means 25. Only the negative value of the electrical change inputted from the high-pass filtering means 21 is half-wave rectified, and the eleventh comparing means 26 is the first reference data (threshold value) 28 when the electrical change inputted from the eleventh rectifying means 24 is. When it exceeds, the value of the eleventh latch means 29 is switched from Low (L) to High (H), and the twelfth comparing means 27 is when the electrical change input from the twelfth rectifying means exceeds the first reference data 28 12th The value of the switch means 30 is switched from L to H, the difference output means 23 outputs the difference between the two electrical changes input from the first high-pass filtering means 21 and the second high-pass filtering means 22, and the second rectifying means 31 The electrical change input from the difference output means 23 is full-wave rectified, and the second comparison means 32 has an upper threshold of the second reference data (threshold value) 33 for the electrical change input from the second rectification means 31. When the value exceeds the value, the value of the 21st latch means 34 is switched from L to H, while when the lower threshold value is exceeded, the value of the 22nd latch means 35 is switched from L to H. The direction of power noise detected can be determined by integrating the values of the latch means.

  The determination means 36 first determines that the power supply noise has entered by detecting that the value of the eleventh latch means 29 or the twelfth latch means has been switched to H, and then determines the sign of the power supply noise and the flow direction. If the value of the eleventh latch means 29 is H and the value of the twenty-first latch means 34 is H, the sign is positive, the flow direction is from one of the conductors 9 to the other, and the value of the eleventh latch means 29 is H If the value of the 22nd latch means 35 is H, the sign is positive, the flow direction is from the other side of the conductor 9, the value of the 12th latch means 30 is H, and the value of the 21st latch means 34 is H. If the sign is negative and the flow direction is from one of the conductors 9 to the other, and if the value of the 12th latch means 30 is H and the value of the 22nd latch means 35 is H, the sign is negative and the current is The direction is from the other side of the conductor 9 to one side, A constant.

  In the lower part of the figure, an example in which the electrical change detected by the first detection means 13 and the second detection means 14 is deformed inside the electricity monitoring device 1 is shown. Specifically, (a) to (d) in the figure. An example of the waveform at the point is shown. The dotted lines shown in (c), (d) and (e) are reference data (threshold values), respectively. (1) is an example in which positive noise enters from one of the conductors 9, (2) is an example in which negative noise enters from one of the conductors 9, and (3) is a positive noise in the conductor 9. (4) is an example in which a negative value of noise has entered from the other side of the conductor 9.

  In the present embodiment, only the electrical change input from the first detection means 13 is rectified for each of the positive half wave and the negative half wave and input to the determination means 36 to detect power supply noise. Similarly, it is effective to use the electrical change input from the second detection means 14 for detecting power supply noise by rectifying the positive half wave and the negative half wave respectively and inputting them to the determination means 36.

It is a figure which shows the example of installation with respect to the conducting wire of the electrical monitoring apparatus in Example 1. FIG. It is a principal part block diagram of the electricity monitoring apparatus in Example 1. FIG. It is a principal part block diagram and the example of a waveform of the electricity monitoring means in Example 1. FIG.

Claims (2)

  An electrical monitoring device capable of monitoring an electrical state of a conductor, and analyzing an electrical change of one and the other of the conductor with a filter that can change at least a part of the electrical change of the conductor as a boundary. An electrical monitoring device comprising electrical monitoring means capable of determining a tidal current direction for at least a part of a mechanical change. An electrical monitoring method for monitoring the electrical state of a conductor, wherein the electrical change is analyzed by analyzing the electrical change of one and the other of the conductor with a filter that can change at least part of the electrical change of the conductor as a boundary. An electrical monitoring method characterized in that the tidal direction can be determined for at least a part of the power.

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