JP2005276530A - Switching-on display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching-on display by which the switching-on state of an electric apparatus can be perceived at a glance from a remote place without adding any alteration on the electric apparatus, with respect to the switching-on display displaying switching-on state of the apparatus. <P>SOLUTION: A current detecting element is connected in series to an electric apparatus, and by this current detecting element, alternating current flowing in the electric apparatus is detected and a switching circuit is operated. This switching circuit is connected in series to a display for displaying the switching-on state of the electric apparatus. Further, the switching circuit and the display connected in series are connected in parallel to the electric apparatus. By the operation of the switching circuit, the display is lighted while current is flowing in the electric apparatus, and the display is turned off while the current is not flowing in the electric apparatus. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an energization indicator that displays an energization state of an electrical device, and more particularly to an energization indicator that can visually recognize the energization state of the electrical device from a position away from the electrical device without any change. is there.

  As means for visually confirming the energization state of an electric device or the like, there is a power lamp or the like provided in the electric device, but not all electric devices are provided with a power lamp.

  In addition, the table tap inserted between the outlet for supplying power to the electrical equipment (hereinafter referred to as a power supply outlet) and the power plug of the electrical equipment (hereinafter referred to as the electrical equipment plug) is connected to the power supply state. Some have a lamp to display. As shown in FIG. 5, there is a table tap that can display the energization state of the outlet portion 102a by the energization display lamp LED.

In this table tap, a series circuit of a diode D1, a current-limiting resistor R1, and an energization display lamp LED composed of a light-emitting diode is connected in parallel to both ends of an electric circuit connecting the cable 103 and the two outlet portions 102a. Is connected to the commercial power supply AC and is supplied with power from the commercial power supply AC, a current is supplied to the energization display lamp LED through the diode D1 and the resistor R1, and the energization display lamp LED is lit to turn on the outlet 102a. It is comprised so that an energization state may be displayed.
JP 2000-037035 A

  In addition, there is a table tap that has a power switch at a power outlet of the table tap and includes an indicator such as an LED in the power switch to display an energization state of the power outlet.

  However, power lamps provided in electrical equipment and the like are provided at specific locations of the electrical equipment, and many of these lamps are also small, and it is difficult to easily check the energized state of the electrical equipment from a remote location. there were. A circuit for detecting an energized state provided in an electric device or the like is used as an overcurrent protection circuit.

In the case of the former table tap, the power indicator lamp LED is lit if the cable 103 is connected to the commercial power source AC, regardless of whether or not an electrical device is connected to the outlet portion 102a. There was a problem that the energization state of the electrical equipment was not displayed.

  In the case of the latter table tap, an indicator such as an LED provided in the power switch lights up when the power switch is turned on, and only indicates whether or not the outlet can supply power. There is a problem that the energization state of the electric device connected to the table tap is not displayed.

  In this way, it is difficult to easily see the energization state of the electric device from a remote position. For example, in a laboratory, the electric device such as a measuring device, electric stove, electric kotatsu, soldering iron, etc. It was difficult to confirm at a glance from a position away from the state. On the other hand, in order to check the energized state, approach the measuring device, electric stove, electric kotatsu, soldering iron, and other electric devices, check the power lamps of these electric devices, and check the connection status with the power supply. In the case of electric devices such as electric stoves, electric kotatsu, and soldering irons, it was necessary to hold the hand and check whether it was hot.

  The present invention has been made in view of such a problem, and an object of the present invention is to make it easy to visually recognize the energized state of an electrical device from a remote position.

  According to the first aspect of the present invention, a power supply side plug to be inserted into a power supply outlet of an electric device, an electric device side outlet into which the electric device plug of the electric device is inserted, and energization of the electric device connected to the electric device side outlet A display for displaying the status, a current detection element that is connected in series with an electric device, and detects a current flowing through the electric device, and a display that is connected in series with the current detection element, and the display is turned ON / OFF by the current detection element. Connecting a display circuit and a switching circuit connected in series with an electric device in parallel, plugging the electric device into an electric outlet, and inserting the power plug into an electric power supply outlet Thus, the energization state of the electric device is displayed.

  The invention according to claim 2 is the invention according to claim 1, wherein the current detection element uses a toroidal transformer, and the invention according to claim 3 is the invention according to claims 1 to 2, The switching circuit uses an SCR (silicon controlled rectifier), and the invention according to claim 4 is the invention according to claim 1 or 2, wherein the switching circuit uses a triac.

  Since the invention according to claim 1 is as described above, the display can be turned on only by connecting between a power plug of a commercially available electrical device and a household outlet without making any changes to the electrical device. Depending on whether it is turned off or off, the energized state of this electric device can be easily recognized from a remote position. In addition, wasteful use of electricity due to forgetting to turn off the power switch of the electrical equipment can be prevented. Further, for example, in the case of an electric device such as a soldering iron, an electric stove, or an electric kotatsu, it is possible to prevent a fire accident due to forgetting to turn off the power switch.

  Since the invention according to claim 2 is configured as described above in the invention according to claim 1, the same effect as that of claim 1 is obtained. Furthermore, the energization indicator can be reduced in size and weight, and the reliability can be improved.

  Since the invention according to claim 3 is configured as described above in the invention according to claims 1 and 2, the same effects as those of claims 1 and 2 are obtained. Furthermore, since there is no mechanical working part such as a relay, the reliability of the energization indicator can be improved. In addition, the energization indicator can be reduced in size and weight.

  Since the invention which concerns on Claim 4 was comprised as mentioned above in the invention which concerns on Claims 1-2, there exists an effect similar to the said Claims 1-2. Furthermore, since there is no mechanical working part such as a relay, the reliability of the energization indicator can be improved. In addition, the energization indicator can be reduced in size and weight. Furthermore, since the display can be lit at a frequency twice that of the SCR, the visibility of the display is improved.

  A current detection element is connected in series with the electric device, and a transformer is used as the current detection element. The transformer detects an alternating current flowing in the electrical device, and operates the switching circuit with a current induced in the secondary coil. As this switching circuit, an SCR (silicon controlled rectifier) or a triac is used and connected in series with a display for displaying the energization state of the electrical equipment. Further, the switching circuit and the display connected in series are connected in parallel with the electric device. As a display, a commercially available light bulb (for example, a jumbo ball) is used, and the display is turned on while the current is flowing through the electrical device by the operation of the switching circuit, and is displayed while the current is not flowing through the electrical device. Goes off.

A first embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a circuit diagram of an energization indicator 1 according to the present invention, FIG. 2 is a current waveform in each part of the energization indicator 1, and FIG. 3 is a perspective view of the energization indicator 1.

  As shown in FIGS. 1 and 3, the energization indicator 1 includes a fuse 2, a power supply side plug 3, an electrical equipment side outlet 4, a current detection element 5, a transformer 6, a switching circuit 7, and a display. It comprises a container 8 and a case 9.

  The fuse 2 protects the energization indicator 1 and the electric device 10 connected to the energization indicator 1 from overload and short circuit. The power supply side plug 3 is inserted into a power supply outlet 11 that supplies a commercial power supply (100 V, 50/60 Hz) to the electric device 10, and the electric device side outlet 4 is an electric device plug that is a power plug of the electric device 10. 12 is inserted.

  The current detection element 5 detects a current when the electric device 10 is energized. In this embodiment, a toroidal transformer is used. The primary side of the current detection element 5 is connected in series with the electric device 10 via the fuse 2.

  The transformer 6 is for boosting the voltage induced on the secondary side of the current detection element 5, and the primary side of the transformer 6 is connected to the secondary side of the current detection element 5. If the voltage induced on the secondary side of the current detection element 5 can supply a current sufficient to turn on the switching circuit 7, the transformer 6 can be omitted.

  The switching circuit 7 controls ON / OFF of the display device 8, and an SCR is used in this embodiment. The secondary side of the transformer 6 or the secondary side of the current detection element 5 when the transformer 6 is omitted is connected to the gate G and the cathode K of the switching circuit 7. Further, the display 8 is connected to the anode A of the switching circuit 7, and the return of the power source supplied to the electrical device 10 is connected to the cathode K of the switching circuit 7. In addition to the SCR used in the first embodiment and the triac used in the second embodiment to be described later, transistors, field effect transistors (FETs, MOSFETs), high-sensitivity relays, etc. are used as switching circuit elements. You may do it.

  The indicator 8 displays the energization state of the electrical device 10 and uses a commercially available light bulb (jujube sphere) in this embodiment. As this display, a high-intensity LED (light emitting diode) in which resistors are connected in series may be used.

  The case 9 is formed so as to surround the current detection element 5, the transformer 6, and the switching circuit 7, which are the main parts of the energization indicator 1, and the fuse 2 and the power supply side plug are formed on the surface of the case 9. 3, an electrical device side outlet 4 and a display 8 are arranged. The case 9 is formed so that the power indicator 1 can be fixed to the power supply outlet 11 by inserting the power supply side plug 3 into the power supply outlet 11.

  When the energization indicator 1 is fixed to the power supply outlet 11, the indicator 8 and the fuse 2 are arranged on the upper surface of the case 9 so as to be easily visible as shown in FIG. 3. In addition, the electrical equipment outlet 4 is disposed at a position where the electrical equipment plug 12 on the front of the case 9 can be easily inserted.

Next, the action operation will be described in detail with reference to FIGS.
In FIG. 2, reference numeral 13 denotes a current waveform on the primary side of the current detection element 5, reference numeral 14 denotes a current waveform between the gate G and the cathode K of the switching circuit 7, and reference numeral 15 denotes an SCR as an element of the switching circuit 7 in this embodiment. It is a current waveform of the display device 8.

  First, the power supply side plug 3 is inserted into the power supply outlet 11, and the electrical equipment plug 12 is inserted into the electrical equipment side outlet 4. By connecting in this way, power is supplied from the power supply outlet 11 to the electric device 10 via the power plug 3, the fuse 2, the primary side of the current detection element 5, and the electric device outlet 4.

  When the electric device 10 has a power switch, when the electric device 10 is in an operating state by turning on the power switch or the like and a current is passed through the electric device 10, a current flows on the primary side of the current detection element 5. The current waveform on the primary side of the current detection element 5 at this time is a current waveform 13.

  On the secondary side of the current detection element 5, a voltage proportional to the current flowing through the electrical device 10 is induced. This induced voltage is further boosted by the transformer 6, and a current flows between the gate G and the cathode K of the switching circuit 7. When this current exceeds a threshold value for turning on the SCR used in the switching circuit 7, the SCR used in the switching circuit 7 is turned on. The current waveform between the gate G and the cathode K of the switching circuit 7 at this time is a current waveform 14.

  When the switching circuit 7 becomes conductive, a current flows through the display circuit 8 through the switching circuit 7, so that the display apparatus 8 is lit. At this time, when the voltage applied to the display 8 becomes negative, the SCR used in the switching circuit 7 becomes non-conductive, and the display 8 is temporarily turned off. However, when the next cycle, that is, when the current between the gate G and the cathode K of the switching circuit 7 exceeds the threshold value for turning on the SCR used in the switching circuit 7, the indicator is displayed again. 8 lights up. This cycle is the frequency (50 or 60 Hz) of commercial power supplied from the power supply outlet 11, and the indicator 8 is repeatedly turned on and off in this cycle.

  The lighting status of the display 8, that is, the ratio of the lighting time and extinguishing time of the display 8 in this cycle, depends on the ratio of the toroidal transformer used in the current detection element 5 and the transformer 6. This varies depending on the ratio of the windings of the transformer and the characteristics of the SCR used in the switching circuit 7. Although it depends on the lighting state of the indicator 8, it is basically the same as a fluorescent lamp, and it appears to the human eye as if the indicator 8 is almost lit. The waveform of the current flowing through the display 8 at this time is a current waveform 15.

  The second embodiment of the present invention is an embodiment where a triac is used in the switching circuit 7. Hereinafter, the second embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3, but the description of the same parts as those of the first embodiment will be omitted. In FIG. 2, reference numeral 16 denotes a current waveform of the display 8 in this embodiment using a triac as an element of the switching circuit 7.

  In the case of this embodiment using the triac in the switching circuit 7, unlike the SCR used in the switching circuit 7 of the first embodiment, even if the voltage applied to the display 8 becomes negative, it is used in the switching circuit 7. The TRIAC that is present is not non-conductive, and the indicator 8 is lit with a reverse polarity voltage. For this reason, the waveform of the current flowing through the display 8 becomes a current waveform 16, and the display 8 lights up at a frequency twice that of the SCR used in the switching circuit 7 of the first embodiment.

  In the first embodiment of the present invention, the place where the energization indicator 1 is fixed is limited to the place where the power supply outlet 11 is installed. The third embodiment of the present invention is not limited to this place, and is an embodiment in which the energization indicator 1 can be installed in a place where it can be seen more easily. Hereinafter, a third embodiment of the present invention will be described in detail with reference to FIG. The description of the same parts as those of the first and second embodiments of the present invention will be omitted.

  As shown in FIG. 4, the case 17 surrounds the current detection element 5, the transformer 6, and the switching circuit 7, which are the main parts of the energization indicator 1, as in the case 9 of the first embodiment of the present invention. It is formed to do. The fuse 2 and the indicator 8 are arranged on the surface of the case 17, but the power supply side plug 3 and the electric equipment side outlet 4 are not arranged. The power supply side plug 3 is connected to the main part of the energization indicator 1 inside the case 17 via the power supply side cable 18 and the electrical equipment side outlet 4 via the electrical equipment side cable 19, respectively. On the surface of 17, an opening (not shown) for passing these cables through the case 17 is formed.

  Reference numeral 20 denotes a fixing means for fixing the case 17 to an easily visible place, and is attached to the surface of the case 17. In this embodiment, the fixing means 20 uses a magic tape.

  With the configuration as described above, there are restrictions on the place where the electric device 10 is used and the place where the power supply outlet 11 is installed, but the cables of the power supply side cable 18 and the electric device side cable 19 are limited. The energization indicator 1 can be fixed at any easy-to-see place within the range allowed by the length of the.

  There are no special electrical components used in this energization indicator, and a small and lightweight instrument can be realized at low cost. Moreover, since the voltage of the input power source can correspond to about 100 V to about 240 V with the same energization indicator, it is not limited to general household electric appliances and electric appliances for measurement used in laboratories, etc., and electric devices using industrial electric power But it can be used and its application range is very wide.

It is a circuit diagram of the electricity indicator 1 by this invention. The Example of this invention is shown and it is the current waveform in each part of the electricity supply indicator 1. FIG. 1 is a perspective view of an energization indicator 1 according to a first embodiment of the present invention. 2 shows a second embodiment of the present invention and is a perspective view of an energization indicator 1. FIG. It is a circuit diagram which shows embodiment of the conventional table tap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current supply indicator 3 Power supply side plug 4 Electrical equipment side outlet 5 Current detection element 7 Switching circuit 8 Display 10 Electrical equipment 11 Power supply outlet 12 Electrical equipment plug

Claims (4)

A power supply side plug that plugs into a power supply outlet of an electrical device;
Electrical equipment outlets into which electrical equipment plugs are inserted,
An indicator that displays the energization state of the electrical equipment connected to the electrical equipment outlet,
A current detection element that is connected in series with an electrical device and detects a current flowing through the electrical device;
A switching circuit that is connected in series with the display and that turns the display ON / OFF by the current detection element;
The display and the switching circuit connected in series are connected in parallel with an electrical device,
An energization indicator for displaying an energization state of an electrical device by inserting the electrical device plug into the electrical device outlet and inserting the power supply plug into the power supply outlet. The energization indicator according to claim 1, wherein the current detection element uses a toroidal transformer. The energization indicator according to claim 1, wherein the switching circuit uses an SCR (silicon controlled rectifier). The energization indicator according to any one of claims 1 to 2, wherein the switching circuit uses a triac.

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