JP3757599B2 - Power management meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a multiple minute signal detection circuit for use in a circuit for amplifying a plurality of minute signals such as a touch key utilizing a change in capacitance and a magnetic field sensor utilizing a magnetic field change due to the approach of a magnet to determine a signal.Is the operation keyIt relates to power management meters.
[0002]
[Prior art]
  Hereinafter, the conventional power management meter inputs the voltage and current of the power system, and consists of a measurement circuit, a calculation unit, a display unit, and an operation key unit, and measures various electrical quantities such as voltage, current, and power of the power system. It was something to monitor. A plurality of minute signal detection circuits used inside the power management meter will also be described with reference to FIGS. As shown in FIG. 15, the power system 20A and the power management meter 21A take in the measurement circuit 23A from the voltage detection line 22A and the current detection line 22B, and obtain various electrical quantities such as voltage, current, and power by the calculation unit 24A. The operation key portion 26A for selectively displaying the measurement value on the display portion 25A and selecting the display content is provided. FIG. 16 shows the appearance of the power management meter 21A. A display unit 25A for displaying various electrical quantities of the power management meter 21A and an operation key unit 26A for selecting display of the display contents are arranged on the front. Further, FIG. 17 shows a plurality of minute signal detection circuits 11A for detecting an induced electromotive force (about 20 mV) due to a magnetic field change used in the operation key portion 26A of the power management meter 21A. That is, the conventional plural minute signal detection circuit 11A detects a change in the magnetic field by the six minute signal detection coils 12A, and amplifies the minute voltage signal generated therein to a voltage level at which the input of the multiplexer circuit 13A can be determined. Amplification is performed by the circuit 14A, and the amplified minute voltage signal is input to the multiplexer circuit 13A for sequentially switching, and the signal is sequentially read and detected by the reading means 15A.
[0003]
[Problems to be solved by the invention]
  In such a conventional power management meter or a plurality of minute signal detection circuits, in order to detect a plurality of minute signals, amplifying means 14A must be provided for each of the plurality of minute signal inputs. The configuration of the detection circuit is complicated and the number of parts is increased, resulting in the disadvantage that the equipment is increased in size and cost.
[0004]
  Further, if the minute detection signal cannot be amplified to a voltage level that can be detected by the multiplexer circuit 13A as the signal switching means by the one-stage amplification means 14A, an additional amplification means (not shown) must be added. There was a disadvantage of being expensive.
[0005]
  In general, the amplifying unit 14A has a characteristic that the output signal is delayed with respect to the input signal. When switching is performed by the multiplexer circuit 13A, which is the signal switching unit, at the preceding stage of the amplifying unit 14A, the order is increased. When reading, this delay operation causes a reading error, causing a technically difficult problem.
[0006]
  In addition, when a minute signal is simultaneously input to the magnetic field change detection coil 12A, which is an input means located next to it, or when the distance between the adjacent magnetic field change detection coils 12A is short, switching is performed in order by a delay operation. In other words, it is erroneously detected that signals to be input simultaneously are input.
[0007]
  The object of the present invention is to solve the above-mentioned conventional problems.
[0008]
[Means for Solving the Problems]
  To achieve this object, the present inventionPower management meterThe first means is a signal input for inputting a plurality of minute signals such as a touch key using capacitance and a magnetic field sensor due to a change in magnetic field and outputting an induced electromotive force having a voltage level capable of input determination to the next stage. Means, a signal switching means for switching and selecting a plurality of inputted minute signals in order, a switching command means for issuing a switching command to the signal switching means, and a level at which the selected signal can be detected and determined. Plural minute signal detection circuit having one amplification means for amplifying and reading means for reading the signalIs used for the operation key section.
[0009]
  In addition, the present inventionPower management meterThe second means isMultiple minute signal detection circuit used for first means of power management meterIn this case, when the signal input means generates an induced electromotive force at a voltage level at which the input determination of a plurality of minute signals is impossible, a plurality of amplification means corresponding to the signal input means are connected to the subsequent stage of the signal input means Then, the voltage is amplified to a voltage level that can be input to the signal switching means in the next stage.
[0010]
  In addition, the present inventionPower management meterThe third means isMultiple minute signal detection circuit used for first means of power management meterAnd a time adjusting means for adjusting the reading time by a delay time in which the signal is delayed by the amplifying means, and a reading means for reading the signal delayed by the time adjusting means.
[0011]
  In addition, the present inventionPower management meterThe fourth means isMultiple minute signal detection circuit used for first means of power management meterIn order to eliminate the influence of the induced electromotive force of the voltage level that can be determined as input to the adjacent signal input means from the leakage signal of the signal to be input to the predetermined signal input means, Provided with signal selection adjustment means to delay signal switching timeIt is.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  Of the present inventionThe multiple minute signal detection circuit used for the first means of the power management meter is:A plurality of minute signals are input to a plurality of signal input means, and an induced electromotive force at a voltage level at which the next stage input can be determined is output and input to the signal switching means. The signal switching means selects a signal while sequentially switching the induced electromotive force generated by the signal input means according to a switching command from a switching command means for issuing a switching command for the signal switching means. Next, the amplifying means amplifies the selected induced electromotive force to a voltage level that can be detected and determined, and the reading means reads the signal of the detectable voltage level amplified by the amplifying means. In this way, even if a minute signal input to the signal input means is a plurality of inputs, the plurality of minute signals can be detected by a single amplifying means by providing the signal switching means before the amplifying means. It has an action that can be done.And the 1st means of the power management meter of this invention uses this several minute signal detection circuit for the operation key part, and is the power management used for measurement monitoring of each electric quantity, such as a power receiving / distribution installation and a power generation installation. This ensures reliable and smooth key operation.
[0013]
  In addition, the present inventionThe multiple minute signal detection circuit used for the second means of the power management meter is:When a plurality of minute signals are input to a plurality of signal input means to generate an induced electromotive force at a voltage level that cannot be determined by the signal switching means, a plurality of signals corresponding to the plurality of signal input meansAmplifying means andThese are connected to the subsequent stage of the coils, amplified to a voltage level that can be determined by the signal switching means, and input to the signal switching means. Thus, even if a minute signal input to the signal input means is a voltage input that cannot be determined by the input of the signal switching means, a plurality of amplifying means are provided in front of the signal switching means. By enabling the above, the same action as the signal input means of the first means is obtained.The second means of the power management meter according to the present invention uses the multiple minute signal detection circuit in its operation key section, thereby allowing power management used for measurement and monitoring of various electrical quantities such as power receiving / distributing equipment and power generation equipment. This ensures reliable and smooth key operation.
[0014]
  In addition, the present inventionThe multiple minute signal detection circuit used for the third means of the power management meter is:The third means of the multiple minute signal detection circuit is provided with a time adjusting means for adjusting the time so that the reading means delays the reading time from the command signal of the switching command means by the delay time generated between the input and output of the amplifying means, The adjusted time is delayed and a plurality of signals are read sequentially. Thus, even if there is a delay time generated by the amplifying means, reading by the reading means while adjusting the time by the time adjusting means has the effect of preventing reading errors.The third means of the power management meter according to the present invention is a power management used for measuring and monitoring various electrical quantities of power receiving / distribution equipment, power generation equipment, etc. by using the plurality of minute signal detection circuits in the operation key section. This ensures reliable and smooth key operation.
[0015]
  In addition, the present inventionThe multiple minute signal detection circuit used for the fourth means of the power management meter is:A plurality of minute signals are input from the signal input means that eliminates the influence of the induced electromotive force of the voltage level that can be input and determined by the signal switching means that is input to the adjacent coil, and the generated induced electromotive force is Input to the signal switching means. Then, a signal is selected while switching a plurality of minute signals input from the signal switching means by a signal selection adjusting means for changing the signal switching order of the signal switching means and delaying the signal switching time. The amplifying means amplifies the selected minute signal to a voltage level that can be detected and determined. The reading means reads a signal having a detectable voltage level amplified by the amplifying means. As described above, even when a leak signal is simultaneously input to the signal input means located next to the predetermined signal input means, only a predetermined true input signal can be detected, and reading errors can be prevented. HaveAnd the 4th means of the power management meter of this invention uses this several minute signal detection circuit for the operation key part, and is the power management used for measurement monitoring of each electric quantity, such as a power receiving / distribution installation and a power generation installation. This ensures reliable and smooth key operation.
[0016]
  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0017]
  (Embodiment 1)
  The first embodiment of the present invention will be described below with reference to FIG.
[0018]
  FIG. 1 shows the configuration of the first embodiment. In FIG. 1, 1A is a plurality of minute signal detection circuits, and 2A is a magnetic field change detection coil for detecting a plurality of magnetic field changes, and generates an induced electromotive force at a voltage level at which the input of the multiplexer circuit 3A can be determined. Further, the multiplexer circuit 3A sequentially selects and selects signals input as signal switching means. 4A is a switching command means for issuing a switching command to the multiplexer circuit 3A, 5A is an amplifying means for amplifying a minute signal to a voltage level that can be detected and determined, and 6A is a reading means for reading and detecting the amplified signal. In FIG. 1, six magnetic field change detection coils 2A are provided, but six or more coils may be provided.
[0019]
  The operation of the above configuration will be described. When a plurality of minute voltage signals are repeatedly input / exited from signal 1 to signal 6, 6 inputs from signal 1 to signal 6 are taken into the magnetic field change detection coil 2 </ b> A, and a plurality of inductions generated in the magnetic field change detection coil 2 </ b> A are taken. The electromotive force is input to the multiplexer circuit 3A, and the signals are sequentially switched by the switching command from the switching command means 4A. For example, when the signal 1 is selected, the amplification unit 5A amplifies the selected signal 1 to a voltage level that can be detected and determined, and inputs the signal at the voltage level to the reading unit 6A to determine whether or not the signal 1 is detected. To do.
[0020]
  (Embodiment 2)
  Next, a second embodiment of the present invention will be described with reference to FIG.
[0021]
  FIG. 2 shows the configuration of the second embodiment. In FIG. 2, reference numerals 2A, 3A, 4A, 5A, and 6A are the same as those in the first embodiment, and thus description thereof is omitted. 1B denotes a plurality of minute signal detection circuits, and 7A amplifies the induced electromotive force to a voltage that can be inputted to the multiplexer circuit 3A when the induced electromotive force generated by the magnetic field change detection coil 2A cannot be inputted to the multiplexer circuit 3A. Therefore, there are a plurality of amplification means corresponding to each magnetic field change detection coil.
[0022]
  The operation of the above configuration will be described. When a plurality of minute voltage signals are repeatedly input / exited from signal 1 to signal 6, 6 inputs from signal 1 to signal 6 are taken into the magnetic field change detection coil 2 </ b> A, and a plurality of inductions generated in the magnetic field change detection coil 2 </ b> A are taken. The electromotive force is input to the multiple amplifying means 7A corresponding to each coil even if the voltage cannot be input to the multiplexer circuit 3A, so that the input can be determined. The voltage signal is input to the multiplexer circuit 3A, and the signal is sequentially switched by a switching command from the switching command means 4A. For example, when the signal 1 is selected, the amplification unit 5A amplifies the selected signal 1 to a voltage level that can be detected and determined, and inputs the signal at the voltage level to the reading unit 6A to determine whether or not the signal is detected. Is.
[0023]
  (Embodiment 3)
  Next, the third embodiment will be described with reference to FIGS.
[0024]
  FIG. 3 shows the configuration of the third embodiment. In FIG. 3, reference numerals 2A, 3A, 4A, and 5A are the same as those in the first embodiment, and a description thereof will be omitted. 1C is the plural minute signal detection circuit of the third embodiment, and 8A is a time for reading the signal delay time generated between the input and output delayed by the delay time by the reading means 6A when amplified by the amplifying means 5A. The adjusting means reads and detects the signal adjusted in time by the time adjusting means 8A by the reading means 6A. In FIG. 3, the signal input means has six inputs, but may have six or more.
[0025]
  The operation of the above configuration will be described. When a plurality of minute voltage signals are repeatedly input / exited from signal 1 to signal 6, 6 inputs from signal 1 to signal 6 are taken into the magnetic field change detection coil 2 </ b> A, and the generated induced electromotive forces are input to the multiplexer circuit 3 </ b> A. The signals are sequentially switched in response to a switching command from the switching command means 4A. For example, the signal 1 is selected, and the selected signal 1 is amplified by the amplifying unit 5A to a voltage level that can be detected and determined. The time adjustment means 8A adjusts the time by the signal delay time generated between the input and output of the amplifying means 5A, and the reading means 6A reads the signal while delaying the adjustment time, thereby determining the presence or absence of signal detection. Next, the operation of the third embodiment will be described with reference to FIG. In particular, the delay operation of the signal by the amplification means 5A and the read operation of the delay signal by the reading means 6A will be described. In FIG. 4, 21A is a signal input to the amplifying means 5A, and 21B is an output signal amplified by the amplifying means 5A and generating a delay time. 22A is a read timing 1 when the time adjustment means 8A does not adjust the delay time, and 23A is a read signal of the read means 6A at that time, and the read waveform is lost depending on the delay time, and a normal signal waveform is obtained. Cannot be read. 22B is a read timing 2 when the time adjustment means 8A adjusts the delay time, and 23B is a read signal of the read means 6A at that time, and a normal signal is obtained by increasing the read time by the delay time. Waveform can be read. In this way, by adjusting the read timing 2 of 22B in the time adjusting means 8A, it becomes possible to detect the signal normally even if the amplifying means 5A has a delay time. Here, the reading time is increased in the reading signal 23B, but the same applies when the reading timing 1 is delayed by the reading adjustment time.
[0026]
  (Embodiment 4)
  Next, a fourth embodiment of the present invention will be described with reference to FIGS.
[0027]
  FIG. 5 shows the configuration of the fourth embodiment. In the figure, reference numerals 4A and 5A are the same as those in the first embodiment, and thus the description thereof is omitted. 1D is a multiple minute signal detection circuit of the fourth embodiment, 2A is a signal input means connected to the multiplexer circuit 3A so as to eliminate the influence of adjacent input means, and 3A is a signal switch for switching and selecting an input signal. Means 9A is a signal selection adjusting means that can arbitrarily set the switching order of the multiplexer circuit 3A and delays the switching time of each selection signal.
[0028]
  In the above configuration, the operation of the fourth embodiment will be described. First, when a plurality of minute voltage signals repeat the presence / absence of input from signal 1 to signal 6, 6 inputs from signal 1 to signal 6 are taken into the signal input means 2A, and the influence is exerted from the adjacent input means at the input of the multiplexer circuit 3A. They are connected so as not to be input, and input to the multiplexer circuit 3A. Further, the signal input to the multiplexer circuit 3A is switched and selected by the signal selection adjusting means 9A for selecting and adjusting the signal switching order to be discontinuous so as not to be affected by the adjacent input or to delay the switching time. The selected signal is amplified by the amplification means 5A to a voltage level that can be detected and determined, and the presence or absence of signal detection is determined by the reading means 6A. Next, the operation of the fourth embodiment will be described with reference to FIGS.
[0029]
  That is, FIG. 6 illustrates a case where no adjustment is performed by the signal selection adjusting unit 9A, and FIG. 7 illustrates a case where the switching order of the multiplexer circuit 3A is operated discontinuously in the signal selecting unit 9A. A case where the switching time is extended until the adjacent input means is not affected by the signal selection adjusting means 9A will be described with reference to FIG. A case where the connection arrangement of the magnetic field change detection coil 2A and the multiplexer circuit 3A is arranged so as not to be affected by the adjacent input means will be described with reference to FIG.
[0030]
  First, in FIG. 6, the input signal from the magnetic field change detection coil 2 </ b> A is a signal in which signal 1 is input to the input 1 of the magnetic field change detection coil 2 </ b> A, and the leakage signal 1 is adjacent to the magnetic field change due to the influence of the signal 1. A case where the signal is input to the input 2 of the detection coil 2A and the signal 3 is not influenced by the input 3 is shown. In such a case, FIG. 6 shows a case where the signal output from the multiplexer circuit 3A is switched and selected at time T1, signal 2 is selected at time T2, and signal 3 is selected at time T3. Further, when switching is performed in the order of switching 1, 2, and 3 by the multiplexer circuit 3A, erroneous detection occurs due to the leakage signal 1 of the input 2 of the coil 2A.
[0031]
  On the other hand, FIG. 7 shows the case where the signal 1 is switched and selected at time T1, the signal 3 is selected at time T2, and the signal 2 is selected at time T3 by the operation of the signal selection adjusting means 9A. is there. Therefore, in this case, the leakage signal 1 input at time T2 can be removed by changing the switching order, and erroneous detection does not occur. Thus, by making the switching order of the adjacent input signals discontinuous by the operation of the signal selection adjusting means 9A, it is possible to prevent erroneous signal detection.
[0032]
  FIG. 8 shows a case where the signal switching time is delayed until the influence of the adjacent signal input is eliminated, and the signal 1 is switched and selected at the time T1 by the signal selection adjusting means 9A, and the signal 2 is input to the adjacent input 2. The period of time T1 is delayed until the influence of signal 1 disappears. Furthermore, the case where the signal 2 at the time T2 and the signal 3 at the time T3 are selected is shown. In this case, by delaying the time T1 by the time when the leakage signal 1 is input to the adjacent input 2, there is no influence at the time T2 of the switching 2 and no erroneous detection is performed. In this way, by delaying the switching time until the influence of the adjacent input signal is eliminated by the signal selection adjusting unit 9A, erroneous detection of the signal can be prevented.
[0033]
  Further, FIG. 9 shows a case where the arrangement connection from the adjacent input means to the multiplexer circuit 3A is such that the output of the multiplexer circuit 3A becomes discontinuous, and the switching 1 from the input 1 of the magnetic field change detection coil 2A to the multiplexer circuit 3A. , And input 2 to switch 3, and further input 3 to switch 2. In this case, the time T2 when the leakage signal 1 is input to the adjacent input 2 selects the signal switching 2 of the input 3 by the multiplexer circuit 3A, and the input 2 is selected by the switching 3 at the time T3 when the influence of the leakage signal is eliminated. Therefore, the leakage signal 1 to the input 2 is not output to the output of the multiplexer circuit 3A, and the influence of the adjacent input can be eliminated and erroneous detection is not performed. Thus, by arranging the magnetic field change detection coil 2A and the multiplexer circuit 3A so as to eliminate the influence of the adjacent input, it is possible to prevent erroneous signal detection.
[0034]
  (Embodiment 5)
  Next, a fifth embodiment of the present invention will be described with reference to FIGS.
[0035]
  FIG. 10 shows the configuration of the fifth embodiment. In FIG. 10, 20A is a power system such as a power receiving facility and a power generation facility where a power management meter is installed, and 21A is a power management meter according to the present embodiment. 22A is a voltage taken into the power management meter to measure the voltage of the power system, and 22B is its current. 23A is a measurement unit for converting the voltage and current measured inside the power management meter into a voltage that can be calculated, and 24A is an electric quantity such as voltage, current, power, etc., measured by the measurement unit 23A. In addition, the calculation unit that controls and detects the display of the display unit 25A and the input of the operation key unit 27A outputs a display corresponding to the predetermined operation key unit 27A. The display unit 25A displays the calculated values of various electrical quantities.
[0036]
  Further, the operation key section 27A is for switching and selecting the display contents. The operation key unit 27A uses the plural minute signal detection circuit 1A of the first embodiment to detect a magnetic field change by operating a magnet or the like to operate the key, and the magnetic field change detection coil 2A. The case where is used is shown.
[0037]
  FIG. 11 shows the appearance of the power management meter according to the fifth embodiment. That is, reference numeral 21A denotes a power management meter main body, and 20 magnetic field change detection coils 2A of a plurality of minute signal detection circuits 1A are arranged on the operation key unit 27A around the display unit 25A.
[0038]
  The operation of the above configuration will be described. By causing a magnet to approach the magnetic field change detection coil 2A of the multiple minute signal detection circuit 1A of the first means used for the operation key unit 27A, the magnetic field change detection coil 2A can be induced by the multiplexer circuit to determine the input. Electric power (about 20 mV) is generated, the induced electromotive force is easily detected by a plurality of minute signal detection circuits 1A, and the display content corresponding to the magnetic field change detection coil determined in advance by the approach of the magnet is displayed on the display unit 25A. To display. Further, the display content is used by switching to another content by bringing a magnet close to another magnetic field change detection coil 2A.
[0039]
  (Embodiment 6)
  Next, a power management meter according to Embodiment 6 of the present invention will be described with reference to FIG.
[0040]
  FIG. 12 shows the configuration of the sixth embodiment. In FIG. 12, reference numerals 20A, 22A, 22B, 23A, 24A, and 25A are the same as those in the fifth embodiment, and a description thereof will be omitted. Reference numeral 21B denotes a power management meter according to the sixth embodiment. Reference numeral 27B denotes an operation key unit for switching and selecting display contents on the display unit 25A. This operation key unit 21B uses the multiple minute signal detection circuit 1B of the second embodiment in order to detect and operate a magnetic field change by approaching a magnet or the like. This shows the case of use.
[0041]
  Since the external appearance of the sixth embodiment is the same as that of the power management meter of the fifth embodiment, the description thereof is omitted.
[0042]
  The operation of the above configuration will be described. By making a magnet with a weak magnetic field approach the magnetic field change detection coil 2A of the plurality of minute signal detection circuits 1B of the second means used for the operation key unit 27B, the input determination of the multiplexer circuit 3A is made to this magnetic field change detection coil 2A. Inductive electromotive force (less than about 1 mV) that cannot be generated is generated, and the induced electromotive force is set to a voltage that can be detected by the plurality of minute signal detection circuits 1B and easily detected. Then, display contents corresponding to a predetermined magnetic field change detection coil are displayed on the display unit 25A. In addition, the display content is switched to another content by bringing a magnet close to another magnetic field change detection coil.
[0043]
  (Embodiment 7)
  Next, a power management meter according to Embodiment 7 of the present invention will be described with reference to FIG.
[0044]
  FIG. 13 shows the configuration of the seventh embodiment. In FIG. 13, reference numerals 20A, 22A, 22B, 23A, 24A, and 25A are the same as those of the power management meter according to the fifth embodiment, and thus description thereof is omitted. 21C is a power management meter according to the seventh embodiment, and 27C is an operation key unit for switching and selecting display contents on the display unit 25A. The operation key unit 21C uses the multiple minute signal detection circuit 1C of the third embodiment to detect and operate the magnetic field change by bringing a magnet or the like closer thereto. This shows the case of use.
[0045]
  Since the appearance of the seventh embodiment is the same as that of the power management meter of the fifth embodiment, the description thereof is omitted.
[0046]
  The operation of the above configuration will be described. By guiding a magnet to the magnetic field change detection coil 2A of the plurality of minute signal detection circuits 1C of the third embodiment used for the operation key unit 27C, an induction of the multiplexer circuit 3A that can determine the input of the magnetic field change detection coil is possible. An electromotive force (approximately 20 mV) is generated, the induced electromotive force is easily detected by a plurality of minute signal detection circuits 1C, and the display content corresponding to the magnetic field change detection coil determined in advance by the approach of the magnet is displayed on the display unit. 25A is displayed. In addition, the display content is switched to another content by bringing a magnet close to another magnetic field change detection coil.
[0047]
  (Embodiment 8)
  Next, a power management meter according to an eighth embodiment of the present invention will be described with reference to FIG.
[0048]
  FIG. 14 shows the configuration of the eighth embodiment. In FIG. 14, reference numerals 20A, 22A, 22B, 23A, 24A, and 25A are the same as those of the power management meter according to the fifth embodiment, and thus description thereof is omitted. Reference numeral 21D denotes a power management meter according to the eighth embodiment, and reference numeral 27D denotes an operation key unit that switches and selects display contents on the display unit 25A. This operation key portion 27D is performed by detecting a magnetic field change due to the approach of a magnet or the like, and uses the multiple minute signal detection circuit 1D of the fourth embodiment, and shows a case where the magnetic field change detection coil 2A is used. Is.
[0049]
  Since the external appearance of the power management meter of the eighth embodiment is the same as that of the fifth embodiment, description thereof is omitted.
[0050]
  The operation of the above configuration will be described. As shown in FIG. 5, the operation key portion 27D is arranged in a state where a plurality of magnetic field change detection coils 2A are close to each other. When a magnet is brought close to the magnetic field change detection coil 2A, a leakage magnetic field is applied to the adjacent magnetic field change detection coils. However, by using the multiple minute signal detection circuit 1D of the fourth means, it can be easily detected without being affected by the leakage magnetic field, and the coil for magnetic field change detection determined in advance by the approach of the magnet. Corresponding display contents are displayed on the display unit 25A.
[0051]
【The invention's effect】
  The present inventionAccording to the first means of the power management meter, in the operation key part,A plurality of minute signal detection circuits that can be made simple by detecting a plurality of minute signals with a single amplifying means, and have a smaller circuit portion and an economical effect.With this, it is possible to easily detect signals of a plurality of magnetic field changes, and to obtain an effect that simplifies the circuit, reduces costs, and saves space.
[0052]
  Further, according to the second means of the multiple minute signal detection circuit of the present invention,Even if the voltage level of the induced electromotive force generated in the magnetic field change detection coil by a plurality of minute signals is not input to the multiplexer circuit, the magnetic field change detection coil Multiple minute signal detection circuits that enable signal detection by providing a plurality of corresponding amplification meansWith this, it is possible to easily detect signals of a plurality of magnetic field changes, and to obtain an effect that simplifies the circuit, reduces costs, and saves space.
[0053]
  According to the third means of the power management meter of the present invention,By using one amplifying means and time adjusting means for a plurality of minute signals in the operation key section, it is possible to prevent reading errors due to the delay time generated in the amplifying means, and to detect signals with higher reliability. By providing multiple minute signal detection circuits that canSignal detection of a plurality of magnetic field changes can be easily performed, and an effect that simplifies the circuit, reduces cost, and saves space can be obtained.
[0054]
  Moreover, according to the 4th means of the power management meter of this invention,It is possible to easily prevent erroneous detection due to the guidance of input means adjacent to the operation key part or leakage signals, increase the reliability of the equipment, and shorten the distance between the input means. Multiple minute signal detection circuitBy providing, it is possible to easily detect signals of a plurality of magnetic field changes, and it is possible to obtain an effect of enabling circuit simplification, cost reduction, and space saving.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a plurality of minute signal detection circuits in Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing a configuration of a plurality of minute signal detection circuits in the second embodiment
FIG. 3 is a block diagram showing a configuration of a plurality of minute signal detection circuits in the third embodiment
FIG. 4 is a timing chart showing the operation of time adjustment means of a plurality of minute signal detection circuits in the third embodiment.
FIG. 5 is a block diagram showing a configuration of a plurality of minute signal detection circuits according to the fourth embodiment.
FIG. 6 is a timing chart showing an operation when the signal selection adjusting means of the plurality of minute signal detection circuits in the fourth embodiment is not operating;
FIG. 7 is a timing chart showing an operation when the switching order of the signal selection adjusting means of the plurality of minute signal detection circuits in the fourth embodiment is discontinuous;
FIG. 8 is a timing chart showing an operation by a switching time delay of the signal selection adjusting means of the plurality of minute signal detection circuits in the fourth embodiment.
FIG. 9 is an operation explanatory diagram showing an operation when the adjacent arrangement of the signal input means of the plurality of minute signal detection circuits in the fourth embodiment is excluded.
FIG. 10 is a block diagram showing a configuration of a power management meter according to the fifth embodiment
FIG. 11 is an external perspective view of a power management meter according to the fifth embodiment.
FIG. 12 is a block diagram showing a configuration of a power management meter according to the sixth embodiment
FIG. 13 is a block diagram showing a configuration of a power management meter according to the seventh embodiment
FIG. 14 is a block diagram showing a configuration of a power management meter according to the eighth embodiment
FIG. 15 is a block diagram showing the configuration of a conventional power management meter
FIG. 16 is an external perspective view of a conventional power management meter.
FIG. 17 is a block diagram showing a configuration of a conventional multiple minute signal detection circuit;
[Explanation of symbols]
  1A, 1B, 1C, 1D Multiple minute signal detection circuit
  2A Magnetic field change detection coil (multiple minute signal detection circuit)
  3A multiplexer circuit (signal switching means)
  4A switching command means
  5A Amplification means
  6A Reading means
  7A Multiple amplification means
  8A Time adjustment means
  9A Signal selection adjustment means
  20A power system
  21A, 21B, 21C, 21D Power management meter
  27A, 27B, 27C, 27D Operation key section

Claims (4)

Outputs an induced electromotive force at a voltage level that can be input and judged by multiple minute signals, such as a touch key that uses a change in capacitance and a magnetic field sensor that uses a change in magnetic field due to the approach of a magnet. A signal input means for switching, a signal switching means for switching and selecting a plurality of inputted minute signals in order, a switching command means for issuing a switching command to the signal switching means, and the selected signal can be detected and determined. A power management meter using, as an operation key unit, a plurality of minute signal detection circuits each having a single amplification unit for amplifying to a certain level and a reading unit for reading the signal. A power management meter that operates to display various electrical quantities of power equipment. When the signal input means outputs an induced electromotive force of a voltage level at which the input determination of the plurality of minute signals cannot be performed, the plurality of amplification means corresponding to the signal input means are connected to the subsequent stage of the signal input means. The power management meter according to claim 1, wherein the power management meter is configured to amplify to a voltage level that can be input to the signal switching means . A configuration in which the reading means has a time adjusting means for delaying the reading time by a delay time in which the signal is delayed between the input and output of the amplifying means, and the delayed signal is read by the time adjusting means. The power management meter according to claim 1 . In order to eliminate the influence of the induced electromotive force of the voltage level capable of determining the input generated in the adjacent signal input means from the leakage signal from the signal to be input to the predetermined signal input means , the multiple minute signal detection circuit 2. The power management meter according to claim 1, wherein a signal selection adjusting means for delaying a signal switching order and a signal switching time of the means is provided .

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