JPH09189723A - Current inspection device for parallel cords - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inspect parallel cords for electric currents flowing through the cords by detecting the lines of magnetic force generated by the electric currents with a magnetic detector holding the cords with a clip and displaying the state of the detected signal and, at the same time, sending the signal to the outside. SOLUTION: By holding parallel cords 10 with the clip of a main body unit, lines of magnetic forces 24 and 24' are generated from the periphery of each conductor from the electric currents 23 and 23' flowing through the cords 10 and offset with each other. The cords 10 are held between E-shaped cores 6 and 6' and the lines of magnetic force are detected with a coil 26 when the cords 10 are exclusively used for an alternating current or with a magnetic detector 7 provided with a magnetic detecting element when the cords 10 are used for a direct current. The detected signal is sent to a comparator through a differential amplifier, a filter circuit, and a rectifier circuit and the comparator inspects the detected signal by comparing the signal with a preset value and displays inspected results on a display. The display lights in accordance with the magnitude of the measured current and the lighting state of the display can be transmitted to a remote place through an optical fiber. Therefore, the energized state of electric equipment can be confirmed safely and surely without giving such a change as the disconnection, etc., to the equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of easily energizing an electric device and the strength of a signal without cutting a signal line such as a parallel cord for a power source and a parallel cord for a speaker typified by a flat two-core parallel cord of an electric device. And a device for displaying and transmitting the result.

[0002]

2. Description of the Related Art Various electric devices are used from ordinary households to offices, and devices without a power indicator cannot indicate the energized state. It is often confirmed by the. Electric appliances that are not equipped with a power indicator often forget to turn it on and forget to turn it off. Or, if many power plugs are plugged into wall outlets or table taps and you want to replace an unused electrical device with an electrical device that you are going to use, you may be wondering which plug to remove. Depending on the case, such as when replacing the outlet or construction work, the plug of the electric device in operation may be unplugged, resulting in loss. One example is the loss of computer data. When the distance between the outlet and the electric device is long, it is necessary to go to the place where the electric device is installed and check the energized state by the operation of the electric device. For audio equipment,
Usually, the VU meter connected to the amplifier and the acoustic signal actually output from the speaker are listened to and the output is adjusted depending on the level. However, since the VU meter does not always represent the signal sent to the speaker, when the speaker is separated from the amplifier, it may be uncertain whether the signal is really transmitted to the speaker.

Conventionally, there is a clamp meter for measuring the electric current of an electric wire, but usually, the electric current is measured by sandwiching one wiring of a pair in a switchboard or a device with a clamp. The currents flowing through the conductors of the parallel cords used in the electric equipment make a reciprocating movement, so that they are in opposite directions. That is, the magnetic flux is generated around each of the parallel cords in the clockwise direction and the counterclockwise direction with respect to the respective conductors and cancels each other, so that the clamp meter cannot measure. Therefore, the combination of two semi-circular ferrite cores and a coil used in the clamp meter or the like cannot detect the current flowing in the parallel cord. Although it is possible to detect a non-parallel current flowing in the parallel cord or a minute induced current on one side of the parallel cord by a coil and an amplifier, it is unstable. When measuring the current of equipment using an ammeter, it is common to insert a current transformer or shunt resistor between the lines to measure the current or voltage, but once the power or signal of the equipment being used is cut off. There must be.

In the above, the parallel cord used especially for the commercial AC power source has been described, but when the power adapter is used in a small electric device such as a portable personal computer, the adapter and the power plug are often integrated, It is difficult to measure the AC current that is the input of the adapter, and the output of many adapters is often DC, so that it is more difficult to detect and measure.

[0005]

There is a method of newly installing an indicator lamp in an electric device which is not equipped with a power indicator lamp, but this is not economical. It is difficult to measure the current without cutting off the power supply of the device in use. A user of electric equipment needs electrical knowledge in order to use a clamp meter or an ammeter. The method of inserting a measuring instrument between the electric equipment and the power source for measurement, or breaking the parallel cord and measuring with a clamp meter is dangerous because it damages the parallel cord and impairs the appearance. The method of inspecting the energized state by clamping one side of the power supply line inside the equipment requires specialized knowledge and is generally often dangerous.

An object of the present invention is to provide a device for displaying an energized state by simply inserting a clip in a parallel cord of an electric device without modifying or changing the electric device and between the electric device and a power source. is there. For household electric appliances, it is possible to contribute to safety management and energy saving by easily confirming the energized state such as electric kotatsu, electric iron or soldering iron. If the coil of the magnetic detector is changed to a Hall element, it is possible to detect a DC output such as a power supply adapter. Furthermore, it is possible to detect electrical signals between devices that are coupled to each other by means of parallel codes. Examples of uses other than power supply of parallel cords are the above-mentioned speaker cords and telephone cords. According to the present invention, the twist wire and the ground wire can be changed by slightly changing the shape of the magnetic detector according to the cords. It is possible to detect the signal of the cord covering the core wire including the cord. The clip may be removed at the expense of accuracy and stability and can be used as a simple detector for construction or maintenance.

[0007] A more specific object is to collect a plurality of main units of the energization inspection device to supply a power supply that requires a large number of additional devices such as a computer system and peripheral devices, and an overcurrent of the device. It is possible to provide an inspection device capable of detecting the above, and monitoring the usage status of electrical equipment in an office or a home in one place.

[0008]

In order to achieve the above-mentioned object, the parallel cord current inspection apparatus 1 of the present invention has a main body unit 2 as shown in FIG. 1 and FIG. Type magnetic body 6 and cord protector 34, 3
The clip 3 including 4'and the spring 4 are provided, and the pressing portion 5 is pushed to open the body unit and the clip.
The parallel cord 10 is sandwiched as shown in FIG. FIG.
As shown in FIG. 3, the clip is provided with a recess corresponding to the shape of the parallel cord, or the clip is replaceable according to the shape of the parallel cord, and the parallel cord is placed at a predetermined position of the magnetic detector. It can be fixed accurately and the protection of the cord reduces stress on specific parts of the cable. A spring can hold the device on the parallel cords even when the hold down is released. The E-type magnetic body 6, that is, the main core portion is incorporated in the main body unit 2, and the sub-core 6
The ´ part is embedded in the clip. The core preferably has a structure matching the shape of the cord. The body unit has a structure in which the clip is sandwiched so that the core at the center of the core is located exactly at the center of the parallel cord. When the clip is detached and used, the parallel cord is applied to the marked predetermined position by hand. The main body unit includes a magnetic detector 7 including the core, a circuit board 8 including a filter circuit, an amplifier, and a comparator, a power supply 9, and an indicator 13 are composed of an electrostatic and magnetic shield container 30 and a magnetic shield container lid 29. To be done. When the pressing portion 5 of the clip 3 is pushed to sandwich the parallel cord and the clip is opened, the protrusion 11 is pushed by the parallel cord and the switch 12 is actuated so that the main body unit supplies power to the circuit board from the power supply unit. Supply. The change in the minute current generated in the magnetic detector due to the strength of the current flowing in the parallel cord is amplified by the circuit board, and the indicator is turned on by the detected signal. The display is composed of at least one or a plurality of LEDs 13 '. As shown in FIG. 1, the display of the LED can be guided to the remote display 14 by one or a plurality of optical fiber cables 18 as needed to display the status. The optical fiber cable can be easily attached and detached with the optical fiber cable attaching device 19. The mount can be attached to the unit by the projection 30 'of the magnetic shield container and the coupling window 31 of the fiber optic cable mount. When removing, press the fiber optic cable mounter at right angles to the mounting direction,
The vicinity of the window of the attachment has moderate elasticity and is slightly distorted, so that the connection between the protrusion and the window can be released. Further, the required LED can be selected from the plurality of LEDs and the optical fiber cable can be attached. For the optical fiber cable, the mounting screw 32 is rotated to tighten and fix the optical fiber cable. The fiber cable mount can shield the LEDs that do not need to be displayed. The other end of the fiber optic cable is connected to the remote indicator 14 in a similar manner. If a larger number of displays are required, the collective display device 28 shown in FIG. 9 in which a plurality of magnetic detectors and a main body unit are housed in a cabinet can be used. As shown in FIG. 3, in addition to the LED display, an earphone 36 can be connected to the audio output by the external output terminal 22 to monitor the signal status. The audio output is appropriately limited and outputted, and when detecting a low frequency such as 50 or 60H, it can be converted to a frequency that is easy to hear. Various output signals can be selected from the external output terminal by the changeover switch 25. As shown in FIGS. 1 and 2, the buzzer 21 sounds when the condition and the signal match at the time set by the timer setting switch 20. The timer reset switch 17 resets the buzzer circuit and the timer circuit. When the use of the device is stopped, by removing the device from the parallel cord, the protrusion returns, the switch is turned off, the power supply to the main body unit is stopped, and the buzzer disappears.

Furthermore, the precise positional relationship between the E-shaped core and the parallel cords, that is, the measurement of the magnetic lines of force passing between the parallel cords is essential for the stable measurement of a minute current, and it depends on the number of cores of the cord and the shape of the clothing. The gist of the present invention is to include a corresponding deformable core and a mechanism for sandwiching it by a clip or a system similar thereto.

[0010]

As shown in FIG. 4, when the parallel cord 10 is sandwiched between the main body unit and the clip 2, currents 23 and 23 'flowing through the parallel cord cause the conductor of the parallel cord to move according to the right-hand rule of Flemming. Magnetic field lines 24, 24 around
'Is generated, but the magnetic lines of force cancel each other out around the parallel cord. As shown in (C) of FIG.
A magnetic circuit is formed by sandwiching between the cores 6 and 6'of the mold, and the magnetic lines of force passing between the insulating coatings of the parallel cords are passed through the core at the center of the E-shaped magnetic body 6. In the case of the coil 26, alternating current or direct current, the magnetic detector 7 incorporating the Hall element or the magnetic resistance element 27 shown in FIG.
To detect. 5 (A) and 5 (B) are examples in which magnetic lines of force cancel each other out, and an electric signal cannot be obtained in the coil. 5 (C) and 5 (D) are principle diagrams of the magnetic detector important in the present invention, in which the magnetic lines of force pass through the central core of the E-shaped core to obtain an electric signal in the coil. As shown in FIG. 6, when the magnetic detector and the main body unit are separated from each other, if the coil is provided with a separate winding or a lead wire is provided from the middle point for use as a differential amplifier, the coil is resistant to disturbance. As in the example of FIG. 6, the current 26 'of the signal generated in the magnetic detector is amplified by the differential amplifier incorporated in the circuit board 8, noise is removed through the filter circuit, and rectified and stabilized by the amplifier. The signal amplified by the display 13 is displayed on the display 13, or the comparator compares and inspects whether the value exceeds a preset value, and the detection signal is sent to the display for display. The display is composed of at least one LED 13 'and a lighting circuit, and lights according to the magnitude of the measured current and can be displayed at a remote location of the optical fiber. When the condition and the detection signal match at the time set by the timer setting switch 20, the buzzer 21
Can be sounded. A signal can be sent from the external output terminal 22 under the set time and the condition set by the signal selection switch 25. The LCD display 35 displays the timer setting state, the sensitivity of the amplifier, the selection state of the filter, and the state of the power supply 9.

[0011]

EXAMPLE As shown in FIG. 3, in the example in which the current of the parallel cord is inspected by the inspection device 1 equipped with the clip of the present invention, the earphone is connected to the external terminal in addition to the inspection by the display of the display. In this example, the test is performed by connecting to the audio signal and changing the audio signal.

As shown in FIG. 7, a computer system 3 in which the parallel cord current inspection device 1 is composed of a large number of peripheral devices.
3 is attached to the main body and peripheral equipment, and the light of the LED display is guided by the optical fiber cable 18 and is displayed on the remote display 14 at a place easy to see by the user. In this example, an example including detection of an electric signal between the equipments. .

As shown in FIG. 8, an example in which the current inspection device 1 of the parallel cord is attached to an electric appliance such as an electric kotatsu installed in a room as needed and displayed at a place where a user can easily monitor it.

An example in which a plurality of the magnetic detectors and a plurality of the main body units are combined to form a collective display device 28 as shown in FIG.

Further, it can be used to control other electric equipment by the output signal of the parallel cable current inspection apparatus of the present invention. Although the invention has been described with a few embodiments, many variations are possible within the scope of the invention. For example, it is easily conceivable to change the present invention to a card-type small and thin shape and to save the power of the circuit by making the circuit board including the magnetic detector into a thick film or thin film integrated circuit. Further, the shape of the magnetic core used in the magnetic detector is changed from E type to C type so as to sandwich only half of the parallel cord, or only the magnetic detector is used as a probe, and the mounting position is changed. It is also conceivable to attach it to the tip of the main body unit having an acute angle so as to improve the convenience for use in a narrow place. Flat 2
Although the core parallel cord has been taken as an example, it can be applied to a three core parallel cord and a twist cord. A magnet may be used instead of the spring of the clip to hold the parallel cord. Instead of the LED, an LCD (liquid crystal display) or a pointer-type ammeter may be adopted as the display, and analog display may be performed. That is, such modifications are included in the scope of the present invention.

[0015]

As described in detail above, according to the present invention, it is possible to easily and safely confirm the energized state without changing the electric equipment in an electrically insulated state in a used state. In addition, since the state of the electric signal line between the devices, that is, the operation of the device can be monitored, it is possible to contribute to safety management, energy saving, and improvement of operation management of the device.

[Brief description of the drawings]

FIG. 1 is a perspective view of a parallel cord current detection device.

FIG. 2 is a perspective view showing components of the parallel cord current detection device shown in FIG.

FIG. 3 is a configuration diagram according to an embodiment of the present invention.

FIG. 4 is a principle diagram of the present invention.

FIG. 5: Principle diagram of the present invention

FIG. 6 is a circuit block configuration diagram of the present invention.

FIG. 7 is a configuration diagram according to one embodiment of the present invention.

FIG. 8 is a configuration diagram according to an embodiment of the present invention.

FIG. 9 is a configuration diagram according to an embodiment of the present invention.

[Explanation of symbols]

Parallel cord current inspection device 1, main unit 2, clip 3, spring 4, holding portion 5, E-type magnetic body 6, E-type magnetic body 6 ', magnetic detector 7, circuit board 8, power supply unit 9, parallel cord 10, protrusion 11, switch 12, display 1
3, LED 13 ', remote display 14, outlet 15,
Table tap 16, timer reset switch 17,
Optical fiber cable 18, fiber cable mount 19, timer setting switch 20, buzzer 21, external output terminal 22, parallel cord current 23, magnetic detector current 23 ', magnetic force line 24, magnetic force line 24', signal selection switch 25, LCD Display 35, coil 26, Hall element 2
7. Collective display device 28, magnetic shield container lid 29, magnetic shield container 30, magnetic shield container protrusion 30 ', optical fiber attachment coupling window 31, optical fiber cable attachment screw 32, computer system 33, cord protector 34. , Cord protector 34 ', LCD display 35, earphones 36, electric kotatsu 37

Claims (6)

[Claims] 1. A magnetic material such as an EI or EE type ferrite core or an iron core and a coil, in which a current flowing through a parallel cord does not cancel out a magnetic force line generated by the current, that is, a magnetic force line generated between electric wires of the parallel cord. Alternatively, a parallel code is sandwiched between magnetic detectors composed of Hall elements or magnetoresistive elements, and a minute electric signal generated by the magnetic detector is output from a differential amplifier circuit or a combination of amplifier circuits, a filter circuit, a rectifier circuit and a comparison circuit. It is possible to detect and display the state of the electric signal by the main unit that is a combination of the circuit board and the power supply and the indicator and the display such as the LED or LCD, and to send the electric signal and the display signal to the outside. Parallel cord current inspection device. 2. A magnetic detector formed by attaching a cord retainer, which is composed of an E-shaped or equivalent magnetic circuit capable of forming a magnetic circuit and a spring, to the main body unit. The main body unit and the clip are opened by pushing, the parallel cord is sandwiched, and the parallel cord can be held in the main body unit even if the pressing portion is released.
The apparatus of claim 1, wherein the circuit board is powered by the power supply when the clip holds the parallel cord. 3. The cord holder and the magnetic detector are provided with a recess corresponding to the shape of the parallel cord, and the additional magnetic circuit and the magnetic detector corresponding to the shape of the parallel cord are replaceable. Equipment. 4. The apparatus according to claim 3, wherein the parallel cord inspection device is provided with a timer, an alarm sound generator, and an audio output circuit. 5. The apparatus according to claim 4, wherein an optical fiber mount and a remote display are coupled to the parallel cord inspection apparatus and display is possible at a remote location. 6. The apparatus according to claim 5, wherein the magnetic detector is separated from the main body unit, and one or a plurality of electric signals of the detector can be detected by one or a plurality of main body units.