JP2012007947A - Receptacle measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receptacle current measurement device that can be retrofitted to an existing receptacle and has high detection accuracy and high sensitivity.SOLUTION: A receptacle current measurement device uses a magnetic material core 12 surrounding the circumference of two plug blades instead of configuring a magnetic circuit for each plug blade inserted into plug blade inlets 201. A measurement part 10 has a coil 13 configuring a detection part for detecting magnetic flux formed by current running through the two plug blades of an inserted power supply plug in an area between the surface of the receptacle and the power supply plug in a state the plug blades of the power supply plug are inserted into the receptacle. The detection part detects the amount of the current or the amount of power on the basis of the magnetic flux. With this configuration, variations in magnetic fields of magnetic force lines due to adjacent plug blades are offset, and detection output can be an additional value, thereby enabling detection with high sensitivity and high accuracy.

Description

  The present invention relates to an outlet measuring device, and more particularly to an outlet current measuring device that can be retrofitted.

Various electric devices are used from general households to social groups such as companies. However, in the case of electric devices that do not actually have a display device such as a power indicator, the function of the electric device There was no choice but to confirm energization.
For electrical equipment that does not have a display device such as a power indicator, it is easy to forget to turn it on and off. Also, replace the electrical equipment that is plugged into a wall outlet and not used with the electrical equipment that will be used. If this happens, you may be wondering which plug to unplug.
For this reason, a device capable of easily detecting the energized state is desired.

  Conventionally, current and power measurement at an outlet is generally performed using a unit with a plug blade that resembles the shape of a power adapter and a unit with a built-in female blade receiver for connecting a load device. Yes.

For example, Patent Document 1 proposes a small power consumption measuring device 1. FIG. 23 is a sectional explanatory view, and FIG. 24 is a front explanatory view showing the principle. This apparatus is inserted between a power outlet 104 and a power plug 107 of an electric appliance (not shown) to be measured, and measures power consumption of the electric appliance. Reference numeral 102 denotes a core constituting the current value detection unit, reference numeral 102a denotes a current value detection hole, and reference numeral 103b denotes a current value calculation unit. As shown in FIG. 24, the cores 102b are arranged one by one so as to surround the stopper blade 108, and the change in the magnetic field lines is taken out as the output of the detection coil 102c that circulates around the core 102b. And it is comprised so that the output of this coil 102c for a detection may be calculated by the electric current value calculating part 103b. The output of the current value calculation unit 103b is displayed on the current value display unit via the display calculation unit.
And the numerical value calculated based on the measured power consumption and the power consumption is displayed on a display part.

JP 2003-194856 A

  According to the above configuration, the cores 102b are arranged so as to surround the respective plug blades 108, and the currents of the two plug blades 108 are obtained using the change of the magnetic field lines as the output of the detection coil 102c that circulates around the cores 102b. Is configured to take out. For this reason, it is easy to receive the influence of the magnetic field of the magnetic force line resulting from an adjacent plug blade. In addition, the output of the detection coil is likely to vary due to variations in the shapes of the cores 102b and mounting positions. As described above, there is a problem that sufficient detection accuracy cannot be obtained due to the variation caused by the detection coils or the influence of the magnetic field of the magnetic lines of force caused by the adjacent blades.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly sensitive outlet current measuring device that can be attached to an existing outlet later and has high detection accuracy.

  Therefore, the outlet current measuring device of the present invention includes a measuring unit that detects the amount of current or electric energy, a signal processing unit that processes a signal output from the measuring unit, and a measurement result obtained by the signal processing unit. An output unit that outputs, and the measurement unit is formed by a current flowing through two plug blades of the inserted power plug in a region sandwiched between the surface of the outlet and the power plug. A detection unit that detects a magnetic flux, and the detection unit detects an amount of current or an amount of power based on the magnetic flux.

  According to the present invention, in the current measuring apparatus for an outlet, the measuring unit includes an annular magnetic core disposed so as to surround the two plug blades, and a detection coil for detecting magnetism generated in the magnetic core. It is characterized by having.

  According to the present invention, in the above-described outlet current measuring device, the measuring unit detects the output of the detection coil wound around a part of the winding region of the magnetic core.

  According to the present invention, in the above-described outlet current measuring device, the surrounding area of the detection coil is on a line connecting the centers of the two conductors constituting the plug blade and is located outside one of the conductors.

  According to the present invention, in the above-described outlet current measuring device, the magnetic core in the detection coil circulation region is outside the portion where the power plug is inserted into the outlet.

  The present invention has a shape in which the magnetic flux density in the circulation region is larger than in other regions in the above-described outlet current measuring device.

  According to the present invention, in the above-described outlet current measuring apparatus, the magnetic core is configured such that the magnetic resistance is low in the circulation region.

  According to the present invention, in the above-described outlet current measuring device, the magnetic core is configured so that a cross-sectional area becomes large in a circulation region.

  In the current measuring apparatus for outlet according to the present invention, the magnetic core has a core shape formed so that a magnetic field is increased in the circulation region.

  In the current measuring apparatus for outlet according to the present invention, the magnetic core is disposed so as to have a region located close to one of the two plug blades, and the region constitutes a circulation region.

  According to the present invention, in the above outlet current measuring device, the magnetic core has a shape along a magnetic path formed by a current flowing through the plug blade.

  According to the present invention, in the above-described outlet current measuring device, the sensor unit is disposed between the plug blades.

  In the current measuring apparatus for outlet according to the present invention, the sensor unit includes an annular magnetic core disposed so as to surround the two plug blades.

  According to the present invention, in the above-described current measuring apparatus for an outlet, the magnetic core has a protruding portion that protrudes between the two blades from a rotating portion that circulates outside the power plug, and between the magnetic cores. An area where the distance is shortened is formed.

  According to the present invention, in the above outlet current measuring device, the outlet measuring device is driven by a primary battery built in the measuring device.

  According to the present invention, in the above outlet current measuring apparatus, the primary battery is a solar battery.

  The present invention further includes a secondary battery capable of charging the electric power obtained from the solar battery in the outlet current measuring device.

  According to the present invention, in the above-described outlet current measuring device, the measurement unit includes a power feeding coil disposed in the vicinity of the plug blade portion, and generates a magnetic field generated when current is supplied to the power feeding coil. It was configured to acquire by electromotive force.

  According to the present invention, in the current measuring device for an outlet, an electrode that can be electrically contacted when the power plug is inserted is disposed in the plate-like through hole portion of the plug blade insertion port of the measuring unit, and the measuring unit can be energized from the electrode. Configured.

  The present invention further includes a display unit that outputs and displays a measurement result obtained by the measurement unit in the outlet current measurement device, and the display unit is electronic paper.

  The present invention further includes a display unit that outputs and displays a measurement result obtained by the measurement unit in the outlet current measuring device, and the display unit performs output display based on a signal output received wirelessly.

  According to the present invention, in the outlet current measuring device, the thickness of the upper portion of the outlet is larger than that of the insertion portion of the power plug.

  The present invention is characterized in that, in the outlet current measuring device, the outlet measuring device is disposed on the back side of the outlet cover and can be used as an outlet cover.

  According to the measuring apparatus for an outlet of the present invention, since the magnetic circuit is not configured for each of the plug blades but the outer periphery of the two plug blades is surrounded, Variations in the magnetic field lines caused by the blades are canceled out, and the detection output can be an added value. Therefore, highly sensitive and highly accurate detection is possible.

The figure which shows the measuring device for outlets concerning Embodiment 1 of this invention, (a) And (b) is the front view and side view of this measuring device for outlets The block diagram which shows operation | movement of the electric current sensor for reciprocating electric wires used with the measuring apparatus for outlets of Embodiment 1 of this invention. Explanatory drawing of the measuring apparatus for outlets of Embodiment 1 of this invention The figure which shows the principal part structure of the electric current sensor for reciprocating wires used with the measuring device for outlets concerning Embodiment 1 of this invention. The figure which shows the mounting process to the outlet of the measuring device for outlets of Embodiment 1 of this invention The figure which shows the usage example of the measuring device for outlets of Embodiment 1 of this invention, (a) is a figure which shows the measuring device for outlets, (b) is a figure which shows the power plug used as a measuring object The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 2 of this invention. The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 3 of this invention. The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 4 of this invention. The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 5 of this invention. The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 6 of this invention. The figure which shows the principal part structure of the current sensor for reciprocating electric wires which concerns on Embodiment 7 of this invention. The figure which shows the measuring device for outlets using the electric current sensor for reciprocating wires which concerns on Embodiment 9 of this invention, (a) And (b) is the front view and side view of this measuring device for outlets Explanatory drawing of the measuring apparatus for outlets of Embodiment 9 of the present invention Explanatory drawing of the measuring apparatus for outlets of Embodiment 10 of the present invention Explanatory drawing of the measuring apparatus for outlets of Embodiment 11 of the present invention The figure which shows the measuring device for outlets of Embodiment 12 of this invention, (a) is a front view, (b) is a side view Block diagram of an outlet measuring apparatus according to a twelfth embodiment of the present invention The figure which shows the measuring device for outlets of Embodiment 13 of this invention, (a) is a front view, (b) is a side view Block diagram of an outlet measuring apparatus according to a thirteenth embodiment of the present invention The figure which shows the modification of the measuring apparatus for outlets of Embodiment 13 of this invention A perspective view of an outlet measuring device according to a fourteenth embodiment of the present invention. Sectional view showing a conventional compact power consumption measuring device Front explanatory view showing a conventional compact power consumption measuring device

  In this invention, the measuring device for outlets attached to an outlet and measuring the amount of electric current or the amount of electric power is provided. In the present embodiment, a current sensor configured by winding a coil around an annular magnetic core will be described as an example of the outlet measuring apparatus according to the present invention. This measuring device is used by being attached to an outlet.

(Embodiment 1)
The outlet measuring apparatus according to Embodiment 1 is used by being attached to an outlet and measures the amount of current.
The thin outlet measuring apparatus 200 according to the first embodiment of the present invention is an outlet-mounting type, is attached to an outlet, and is used for current detection.

  FIGS. 1A and 1B are a front view and a side view of the outlet measuring apparatus. FIG. 2 is a block diagram showing the operation of the current sensor for the reciprocating wire. FIG. 3 is an explanatory view of the outlet measuring device, FIG. 4 is an explanatory view of a current sensor for a reciprocating electric wire constituting a detection unit used in the outlet measuring device, and FIG. 5 is an attachment of the outlet measuring device to the outlet. The figure which shows a process and FIG. 6 (a) and (b) is a figure which shows a usage example.

As shown in FIGS. 1A and 1B, the outlet measuring apparatus 200 is a reciprocating current detection function unit (not shown) in a resin outer case 202 having a plug blade insertion port 201 of a power plug. The measuring unit 10 and the signal processing unit 20 including a current sensor for electric wires are accommodated.
As shown in FIG. 2, the outlet measuring apparatus 200 includes a measuring unit 10, a signal processing unit 20 that processes a signal output from the measuring unit 10, and a measurement result obtained by the signal processing unit 20. And an output unit 30 that outputs the power to the outlet 300. The output of the output unit 30 is displayed on the display unit 204, for example.

  The measuring unit 10 includes two plugs of the inserted power plug in a region sandwiched between the surface of the outlet 300 and the power plug with the plug blades 1a and 1b of the power plug inserted into the outlet 300. The magnetic flux formed by the current flowing through the blade is detected. And this measurement part 10 detects the amount of electric current based on the magnetic flux formed by the electric current which flows into the two plug blades 1a and 1b.

As shown in FIG. 3, the outlet measuring apparatus includes a magnetic core 12 housed in an outer case 202 and a current detection coil 13 and plug blades 1a and 1b connected to a reciprocating electric wire. Current detection.
As shown in FIG. 1B, the outer case 202 has a very thin thickness t1 of 4 to 5 mm and a thin portion t2 of 2 to 3 mm, as shown in FIG. In addition, the current flowing in the power plug 400 inserted into the outlet 300 can be detected and displayed on the display unit 204. Reference numeral 203 denotes a weighing confirmation LED which blinks when a current flows. Note that this outlet measuring device is configured such that the thickness of the upper portion of the outlet is thicker than that of the insertion portion of the power plug 400 shown in FIG.
Note that the primary battery is used as a power source for driving the measuring device, so that there is no concern about the battery running out of capacity. Moreover, the solar cell has a thin plate-like structure, and can be configured in a thin shape when incorporated in the shape of the measurement unit.

  The output may be displayed on the display unit 204, infrared communication using an infrared LED may be used, or may be displayed externally using wireless communication. In addition to the display, the current amount may be centrally managed by the switchboard, or a large current may be interrupted by a breaker mounted on the switchboard or in the vicinity thereof. As shown in FIG. 6 (b), the plug blades 1a and 1b of the power plug are the tips of the electric conductors 11a and 11b and constitute a part of the electric conductors 11a and 11b. The conductors 11a and 11b will be described.

  As shown in FIG. 4 in an outline of the configuration of the current sensor constituting the measuring section 10, in a balanced circuit having two circuit conductors (primary conductors) (11a, 11b) through which the same current flows in the forward path and the return path, 2 An annular magnetic core 12 made of a soft magnetic material such as permalloy that circulates around the electric circuit conductors 11a and 11b, and a toroidal coil 13 that circulates a part of the circular region r1 of the magnetic core 12. And the current detection unit 14 detects the output voltage of the coil 13 to detect the current of one of the two circuit conductors 11a and 11b (11a).

  The circuit region r1 is disposed on a line connecting the centers of the two electric circuit conductors 11a and 11b and positioned outside the one electric circuit conductor 11a. In other words, the circulation region r1 is located in the vicinity of the electric circuit conductor 11a which is one of the two electric circuit conductors 11a and 11b constituting the electric circuit.

In FIG. 4, for example, the path conductors 11a, current flows toward the front side of the paper to the back side, the primary conductor 11b, when the current flowing from the back side of the paper on the front side flows, each in the direction of arrow M _A, M _B flux m is generated. When magnetic fluxes in different directions are generated in the magnetic core 12, the coil 13 provided in the winding region r1 located in the vicinity of the electric conductor 11a, which is one of the two balanced electric conductors 11a and 11b, Excitation current flows, and the voltage across the coil 13 is measured by the current detector 14. The current detection unit 14 includes a burden resistor 14R. The voltage across the load resistor 14R is measured to detect the current. The current detection coil and the burden resistor 14R are configured by the number of turns and the resistance value in the specifications of the current current detection coil.
FIG. 2 is a block diagram showing the operation of this current sensor. The output of the current detection coil made up of this coil 13 is detected by the current detection unit 14 and is subjected to arithmetic processing by the signal processing unit 20. And based on the output of this signal processing part 20, it outputs by the output part 30, and a display is made by the display part 204 etc. as needed.

According to this configuration, unlike the conventional measuring device, the measuring device does not require a power plug and a female outlet, and the measuring device can be reduced in size and thickness. Further, since the power plug is directly inserted into the outlet, there is no heat generation or contact resistance in the main circuit in the measuring device.
Further, the present invention is characterized in that the core is arranged around the plug blade and magnetism generated in the core is detected. By disposing the annular magnetic core 12 on the outer periphery of the blades 1a and 1b, the magnetic flux generated by the energized current can be efficiently collected.
In addition, it is not necessary to arrange a magnetic body for detecting current between the two electric circuits, and an insulation distance from the plug blades 1a, 1b to the magnetic core can be secured, and a safe design is achieved. be able to.

  Although the amount of current is measured here, it can also be used to measure the amount of electric power directly using a voltage or even a magnetic thin film.

By disposing the annular magnetic core on the outer periphery of the blade, the magnetic flux generated by the energized current can be collected efficiently. In addition, it is not necessary to place a magnetic body for current detection between the plug blades constituting the two electric circuits, and the insulation distance from the plug blade to the magnetic core can be secured, and the safety design is improved. Can be realized.
In addition, by arranging the coil outside the insertion portion of the power plug, the cross-sectional area forming the detection coil can be increased, and the output of the coil can be increased.

  By using the current sensor of the present embodiment, the magnetic core 12 having a closed magnetic circuit is provided on the outer periphery of the two electric circuit conductors 11a and 11b, and a magnetic circuit is formed between the two electric circuit conductors 11a and 11b. Current detection can be performed without any problem. Therefore, it is possible to detect current very easily only by embedding and forming the magnetic core 12 around the coil in an outlet cover (described later). Further, since the magnetic core 12 has a closed magnetic path, the magnetic core 12 has a feature that it is hardly affected by an external magnetic field.

  In the case of the configuration as described above, the coil 13 and the magnetic core with respect to the electric circuit conductor are compared with the case where the coil 13 is wound around a part of the magnetic core 12 having a square cross section and the electric circuit conductor is closely arranged at the center. The twelve magnetic properties vary from position to position and may not be uniform. Therefore, since the balance of magnetic characteristics may be lost depending on the arrangement position of the electric circuit conductor, false detection is likely to occur. For example, when a current flows through the electric conductors 11a and 11b, the distance from the magnetic core may be different, and an imbalance may occur in the magnetic characteristics. Even in such a case, the vicinity of the electric circuit conductor corresponds to a part where the magnetic flux density generated from the electric circuit conductor is high, and the current detection output can be increased by winding a coil around the part. (Improvement of S / N ratio)

(Embodiment 2)
In the outlet measuring device of the present embodiment, as shown in FIG. 7, as an example of a current sensor for a reciprocating electric wire used in the outlet measuring device according to the present invention, the coil 13 The magnetic core 22 has a low magnetic resistance, that is, a region having a large cross-sectional area is formed in a straight line portion in the vicinity of the first electric conductor 11a of the magnetic core 22, and this region is used as a circulation region r2. . Other configurations are the same as those in the first embodiment.

  According to this configuration, an area having a large cross-sectional area is formed in the straight line portion in the vicinity of the first electric circuit conductor 11a located on the left side of FIG. 7, and this area is defined as a circulation area r2. The amount of magnetic flux increases in a straight portion or a region having a large cross-sectional area. Therefore, according to this configuration, the region where the amount of magnetic flux is large is set as the coil turning region r2, the coil is wound around the turning region r2, and the induced current is detected to detect current. As a result, the output can be increased and the S / N ratio can be improved.

  In this way, current detection can be performed with a very simple configuration.

(Embodiment 3)
In the present embodiment, a configuration for improving output is shown as an example of a current sensor for a reciprocating electric wire used in the outlet measuring apparatus according to the present invention. As shown in FIG. 8, in the current sensor for reciprocating electric wires, the magnetic core is formed so that the radius of curvature is different between one of the two electric conductors and the other. The region r3 forms a magnetic core 32 having a region with a small radius of curvature, and the coil 13 is wound around this region as a winding region r3. Other configurations are the same as those in the first embodiment.
According to this configuration, on the side with a small curvature radius, the magnetic path length around which the magnetic flux generated in the electric circuit conductor 11a circulates is shortened, and the magnetic resistance is reduced. Therefore, when the amount of magnetic flux increases, the output in current detection can be increased by winding the coil 13 around that portion.

(Embodiment 4)
In the present embodiment, a configuration for improving output is shown as an example of a current sensor for a reciprocating electric wire used in the outlet measuring apparatus according to the present invention. As shown in FIG. 9, in this current sensor for a reciprocating electric wire, the magnetic core 42 is formed in a symmetrical shape, and is located in the vicinity of one of the two electric conductors 11a and 11b. Are arranged to have. That is, the coil 13 is wound with the region located in contact with the surrounding region r4. Other configurations are the same as those in the first embodiment.
With this configuration, by being close to the electric conductor 11a to be detected, a large amount of magnetic flux can be detected by shortening the distance from the electric conductor 11a, so that the output voltage can be improved.

(Embodiment 5)
In the present embodiment, a configuration for improving output is shown as an example of a current sensor for a reciprocating electric wire used in the outlet measuring apparatus according to the present invention. As shown in FIG. 10, the magnetic core 52 has a divided region 16 in a region excluding the rotating region r <b> 5 and is configured to be divided.
This divided area 16 is the position farthest from the coil 13. Other configurations are the same as those in the first embodiment.
With this configuration, since the divided region 16 is formed at a position farthest from the winding region r5 around which the coil 13 is wound, it is in a state in which the detection current of the coil 13 is hardly affected, and output detection is possible. Detection can be performed without any influence.

(Embodiment 6)
In the present embodiment, a configuration for improving output is shown as an example of a current sensor for a reciprocating electric wire used in the outlet measuring apparatus according to the present invention. As shown in FIG. 11, the magnetic core 62 has a short distance between the magnetic cores 62 between the two electric conductors 11a and 11b. Other configurations are the same as those in the first embodiment.
Here, the magnetic core 62 has a protruding portion 62T that protrudes between the two electric circuit conductors 11a and 11b from a circuit portion R6 that circulates outside the two electric circuit conductors 11a and 11b. A region where the distance between the cores 62 is shortened is formed.

  With this configuration, in the path through which the magnetic flux passes, the magnetic flux m leaks at the projecting portion 62 </ b> T projecting to the upper and lower portions of the left and right center of the magnetic core 62. In order to flow the magnetic flux efficiently, by shortening the distance between the magnetic cores 62 at the portion where the magnetic flux leaks, the amount of magnetic flux can be increased and the sensor output in current detection can be increased.

(Embodiment 7)
In the present embodiment, a configuration for improving output will be described as an example of a current sensor for a reciprocating wire used in the outlet measuring apparatus according to the present invention. In the reciprocating wire current sensor of the present embodiment, as shown in FIG. 12, the magnetic core 72 has a quadrangular annular cross section, and the corners have round shapes. Other configurations are the same as those in the first embodiment.
With this configuration, the length of the magnetic core 72 can be shortened by the amount that the corner has a round shape. Therefore, the penetration workability of the electric conductor can be improved by keeping the magnetic resistance small and increasing the area of the penetrating region of the electric conductor.

  The magnetic core 72 is not only rounded at the corners but also along the outer sides of the electric conductors 11a and 11b, thereby suppressing the magnetic resistance of the magnetic core 72 itself, and the electric conductor 11a. , 11b may be sufficient. For example, a circular magnetic core may be used, or an elliptical magnetic core may be used.

  In the current sensor for a reciprocating electric wire of the present invention, the magnetic core may be formed in a track shape having a long side and a short side in order to achieve both miniaturization and improved assemblability. Here, in addition to the track shape, the shape includes an annular shape having a long side and a short side, such as an elliptical shape and an elliptical shape, and includes shapes having different dimensions in two orthogonal directions. The track conductors 11a and 11b are passed through the track-shaped through-holes of the non-circular magnetic core, and the plurality of circuit conductors are arranged slightly apart from each other without close proximity.

For example, in FIG. 4, the path conductors 11a, current flows toward the front side of the paper to the back side, the path conductors 11b, when the current flowing from the back side of the paper to the front side flow arrows M _A, respectively in the direction of M _B Magnetic flux is generated.

  In the case of the configuration as described above, the magnetic characteristics of the coil and the magnetic core with respect to the electric conductor are different depending on the position as compared with the case where the electric conductor is closely arranged at the center of the perfect magnetic core. It may not be. Therefore, since the balance of magnetic characteristics may be lost depending on the arrangement position of the electric circuit conductor, false detection is likely to occur. For example, when a current flows through the electric conductors 11a and 11b, the distance from the magnetic core may be different, and an imbalance may occur in the magnetic characteristics. Therefore, in the present embodiment, a more sensitive output can be obtained by measuring the current in a circular region located on the line connecting the centers of the two circuit conductors and outside the one circuit conductor. Is possible.

  In addition, the current detection device of the present embodiment is applicable to any number of circuit conductors penetrating into the magnetic core, such as two or three circuit conductors.

(Embodiment 8)
FIG. 13 is a diagram showing a thin outlet measuring device 200S using the current sensor with a leakage detection function according to the eighth embodiment of the present invention. The outlet measuring device 200S is attached to an outlet cover and used as an outlet cover.
FIGS. 13A and 13B are a front view and a side view of the outlet measuring device. FIG. 14 is a diagram showing a process of attaching the outlet measuring device to the outlet.
The outlet measuring device 200S is used by being attached to an outlet also serving as an outlet cover.
Since the other parts are the same as those of the outlet measuring apparatus according to the first embodiment, description thereof is omitted here.

(Embodiment 9)
In the present embodiment, an example in which a Hall element is used will be described as an example of a current sensor for a reciprocating electric wire used in the outlet measuring apparatus according to the present invention.
As shown in FIG. 15, in the current sensor for a reciprocating electric wire, a hall element 50 is installed between the plug blade insertion ports 201 of the outlet, and the plug blades (1a, 1b) of the power plug are inserted into the outlet. Is detected by a Hall element as a magnetic sensor to detect the current. Reference numeral 205 denotes an infrared LED for communication. The infrared LED can communicate with a communication terminal such as a mobile phone or a PDA. Other parts are the same as those of the first embodiment shown in FIG. The same members are denoted by the same reference numerals and description thereof is omitted.
According to this configuration, when the current is measured by detecting the magnetic field generated during energization, the magnetism between the plug blades of the power plug is a portion where the magnetism emitted from each plug blade is strengthened in the same direction. The current can be detected with high sensitivity and high accuracy.

(Embodiment 10)
In the present embodiment, as in the ninth embodiment, a Hall element is used as an example of a current sensor for a reciprocating wire. In addition to this, as shown in FIG. An annular magnetic core 12 is arranged so as to surround the periphery of 1a and 1b. Other parts are the same as those of the ninth embodiment shown in FIG. The same members are denoted by the same reference numerals and description thereof is omitted.
As shown in FIG. 16, this current sensor for a reciprocating electric wire has an annular magnetic core 12 arranged around the blades 1a and 1b to concentrate magnetic flux on the core and pass through the magnetic sensor. The amount of magnetic flux to be increased can be increased. Thereby, the current detection sensitivity can be increased.
As a material constituting the magnetic core 12 used here, a silicon steel plate, ferrite, permalloy or the like generally used in a current sensor or the like is used. The thickness of the magnetic core 12 is preferably about 0.5 mm or less. The blades 1a and 1b of the power plug are electrically insulated from the magnetic core. The magnetic core 12 or the Hall element 50 may be integrally formed with the outlet cover so as to be sealed in the resin outlet cover.

(Embodiment 11)
Next, Embodiment 11 will be described.
As shown in the perspective view of FIG. 17 and the processing block of FIG. 18, the outlet measuring apparatus of the present embodiment is driven by a primary battery, that is, a solar battery 500 incorporated in the apparatus. The solar cell 500 is configured to be able to charge a storage battery 600 such as a lithium ion secondary battery. And when the illumination intensity by illumination light is high and the generated electric power more than the consumption current of this measuring device for outlets is obtained, the storage battery 600 is charged with this generated electric power. On the other hand, when the illuminance is not sufficiently obtained and the generated power is lower than the current consumption of the outlet measuring device, the power source current is directly supplied from the storage battery 600. As described above, the outlet measuring apparatus performs simple power calculation by circuit driving with the solar battery and the storage battery. Other parts are the same as those of the first embodiment shown in FIG. The same members are denoted by the same reference numerals and description thereof is omitted.

  Then, the measurement result obtained by the current detection unit 14 is amplified and waveform processed by the signal processing unit 20 as an output of the measurement unit 10, and is calculated to an energization current value.

  In this way, the hybrid power supply system includes the power generation of the solar cell 500 by the illumination light and the storage battery 600. When the illuminance is high, the generated power exceeding the current consumed by the circuit is charged to the lithium-ion secondary battery as a storage battery.When the illuminance is insufficient and the power generation is below the current consumption of the measurement circuit, the power is Supply. The measurement result obtained by the current detection unit is amplified and waveform-processed by the signal processing unit 20 and is calculated as an energization current value. In practice, the line voltage of the outlet is in the range of 101 ± 6V. Usually, the result of power calculation with the voltage set to 100 V is displayed on the display unit 204 such as electronic paper.

According to this configuration, stable power supply to the measurement circuit is possible.
In the present embodiment, the solar cell is mounted on the surface of the outlet measuring device, and the light receiving area can be further increased.
Indoor outlets are often installed in dark places, but solar batteries can be used as a sufficient measurement power source for outdoor outlets such as street lights.

(Embodiment 12)
Next, an embodiment 12 will be described.
As shown in the perspective view of FIG. 19 and the processing block of FIG. 20, the outlet measuring apparatus of the present embodiment is electrically connected to the plate-like through hole portion of the plug blade insertion opening 201 of the measuring unit 10 when the power plug is inserted. An electrode 206 capable of making a mechanical contact is disposed, and a drive current can be supplied from the electrode 206 as a drive power source. Other parts are the same as those in the eleventh embodiment shown in FIGS. The same members are denoted by the same reference numerals and description thereof is omitted.

  An AC voltage of 100 V is taken from the electrode 206 and converted into a DC voltage for circuit driving by the AC / DC conversion power supply unit 90. According to this configuration, it is only necessary to form the electrode 206 at the plug blade insertion opening 201, and the size can be reduced and the configuration is simple.

Further, since the driving current is supplied by inserting the plug blade of the power plug, the power plug is always operating when the power plug is inserted.
In this embodiment, a drive current flows when a plug is inserted. Therefore, when no plug is inserted, the drive current is zero and the standby current is zero.

In addition, as shown in a modification in FIG. 21, it is also possible to supply the drive current from the electrode 206 at the power plug plug blade insertion portion and to capture the voltage signal for power calculation to constitute the voltage detection unit 91. . Other parts are the same as those of the thirteenth embodiment shown in FIG. The same members are denoted by the same reference numerals and description thereof is omitted.
The voltage signal obtained here is stepped down to about several volts by voltage detection, subjected to signal processing, and sent to the power calculation unit 92. In the power calculation unit 92, the current signal from the measurement unit 10 including the current detection unit 14 and the voltage signal from the voltage detection unit 91 are input as analog signals, perform multiplication calculation, and perform power calculation. The power calculation unit is composed of a microcomputer, and performs analog power conversion by analog-to-digital conversion and digital multiplication.

(Embodiment 13)
Next, Embodiment 13 will be described.
As shown in the perspective view of FIG. 22, the outlet measuring apparatus of the present embodiment has a power supply coil (not shown) disposed in the vicinity of the plug blade, and the magnetic field generated during energization is supplied to the power supply. It is configured so as to be acquired by an electromotive force generated in the coil, and the outlet measuring device is driven by non-contact power feeding. Other parts are the same as those of the twelfth embodiment shown in FIG. The same members are denoted by the same reference numerals and description thereof is omitted.
As shown in the perspective view of FIG. 22A, the outlet measuring device 200 is connected to a power supply cable 241 separately connected to a power source (not shown) via a power plug 240, and in the vicinity of the power supply cable. The power supply coil 242 is provided, and current measurement is performed by an electromotive force generated in the power supply coil. FIG. 22B is a perspective view showing the power plug.

In this case, in a situation where no current flows, no magnetic field is generated by energization, so that the operation of the measurement unit is stopped, and the standby power due to measurement is zero. Therefore, when the non-contact power feeding technique is used, the power consumption by measurement can be completely cut in a state where there is no power supply due to the load.
As described above, according to the present embodiment, since the power plug 240 is inserted to be electrically connected to the power supply cable 241, the power is supplied to the detection circuit unit of the measurement unit only when the power plug is inserted. Current is supplied.
In this way, the standby current consumption in the apparatus when the power plug is not inserted can be made zero.
In addition, the display part which outputs and displays the measurement result by a measurement part may be provided, and the said display part may be made to perform an output display based on the signal output received by radio | wireless.
Further, power supply to the outlet measuring device may be performed directly by a power plug instead of contactless power supply.

  The present invention is intended to be variously modified and applied by those skilled in the art based on the description in the specification and well-known techniques without departing from the spirit and scope of the present invention. Included in the scope for protection.

1a, 1b Plug blade 11a, 11b Electric conductor 12, 22, 32, 42, 52, 62, 72 Magnetic core 13 Coil 14 Current detector 16 Divided region r1-r7 Circumferential region m Magnetic flux 200, 200S Measuring device 201 for outlet Plug blade insertion slot 202 Exterior case 203 LED
204 Display Unit 206 Electrode 240 Power Supply Plug 241 Power Supply Cable 242 Power Supply Coil 300 Outlet 400 Power Supply Plug

Claims (23)

A measurement unit for detecting the amount of electric current or electric energy
A signal processing unit for processing a signal output from the measurement unit;
An output unit that outputs a measurement result obtained by the signal processing unit,
The measuring unit is
In an area sandwiched between the surface of the outlet and the power plug,
A detection unit that detects a magnetic flux formed by a current flowing through two plug blades of the inserted power plug,
The outlet measuring device detects an amount of electric current or electric power based on the magnetic flux. It is the measuring device for outlets according to claim 1,
The measuring device for an outlet includes an annular magnetic core disposed so as to surround the two plug blades, and a detection coil for detecting magnetism generated in the magnetic core. It is the measuring device for outlets according to claim 2,
The measuring unit is an outlet measuring device that detects an output of a detection coil wound around a part of the winding region of the magnetic core. It is the measuring device for outlets according to claim 2,
The measuring device for an outlet is located on a line connecting the centers of two conductors constituting the plug blade and the outer peripheral region of the detection coil is located outside one conductor. It is the measuring device for outlets according to claim 4,
The measuring device for outlets, wherein the magnetic core in the detection coil surrounding region is located outside a portion where the power plug is inserted into the outlet. It is the measuring device for outlets according to claim 4,
An outlet measuring device having a shape in which the magnetic flux density in the circulation region is larger than that in other regions. The outlet measuring device according to claim 6,
The magnetic core is an outlet measuring device configured to have a low magnetic resistance in the circulation region. The outlet measuring device according to claim 7,
The outlet measuring apparatus is configured such that the magnetic core has a larger cross-sectional area in the circulation region. The outlet measuring device according to claim 7,
The measurement device for an outlet, wherein the magnetic core has a core shape formed so that a magnetic field is increased in the circulation region. The outlet measuring device according to claim 9,
The said magnetic body core is arrange | positioned so that it may have an area | region located close to one of the said two plug blades, The said area | region measuring apparatus for electrical outlets which comprises the said circumference | surroundings area | region. It is the measuring device for outlets according to claim 2,
The magnetic core is an outlet measuring device having a shape along a magnetic path formed by a current flowing through the plug blade. It is the measuring device for outlets according to claim 1,
The sensor unit is an outlet measuring device disposed between the plug blades. The outlet measuring device according to claim 11,
The outlet measuring device includes an annular magnetic core disposed so as to surround the two plug blades. The outlet measuring device according to any one of claims 4 to 12,
The magnetic core has a protruding portion that protrudes from the rotating portion that circulates outside the power plug toward the two plug blades, and forms a region in which the distance between the magnetic cores is shortened. Measuring device for outlet. The outlet measuring device according to any one of claims 1 to 14,
The outlet measuring device is an outlet measuring device driven by a primary battery built in the measuring device. The outlet measuring device according to claim 15,
The measuring device for outlets, wherein the primary battery is a solar battery. The outlet measuring device according to claim 16,
Furthermore, the measuring device for outlets provided with the secondary battery which can charge the electric power obtained with the said solar cell. The outlet measuring device according to any one of claims 1 to 14,
The measurement unit includes a power feeding coil disposed in the vicinity of the plug blade portion, and is configured to acquire a magnetic field generated when a current is passed by an electromotive force generated in the power feeding coil. Measuring device for open outlet. The outlet measuring device according to any one of claims 1 to 14,
An outlet measuring device configured such that an electrode that can be electrically contacted when a power plug is inserted is disposed in a plate-like through hole portion of the plug blade insertion opening of the measuring unit, and the measuring unit can be energized from the electrode. The outlet measuring device according to any one of claims 1 to 19,
Furthermore, the display part which outputs and displays the measurement result by the said measurement part is comprised, The said display part is a measuring device for outlets which is electronic paper. The outlet measuring device according to any one of claims 1 to 19,
Furthermore, the measuring apparatus for outlets which has a display part which outputs and displays the measurement result by the said measurement part, and the said display part performs output display based on the signal output received by radio | wireless. It is the measuring device for outlets according to any one of claims 1 to 21,
The outlet measuring device is configured such that the thickness of the upper portion of the outlet is larger than that of the insertion portion of the power plug. 23. The outlet measuring device according to any one of claims 1 to 22,
The outlet measuring device is disposed on the back side of the outlet cover and can be used as an outlet cover.

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