JP2010145244A - Power consumption and overcurrent display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect and display an overcurrent and standby power applied to a load connected to an outlet by a minimal power consumption. <P>SOLUTION: A power consumption/overcurrent display includes: a display section 5 for displaying a state of the power consumption or the overcurrent; a control section 30 for operating a display on the display section 5; a first power supply section 10 for detecting a current flowing in the load, and generating a voltage in proportion to the detected current value; and a second power supply section for intermittently charging power flowing from the load, and supplying the charged power to the control section. The control section 30 is configured so as to indicate timing when the second power supply section 20 deactivates charging if the first power supply section 10 generates a predetermined voltage or more, and also indicate timing when the second power supply section 20 intermittently activates the charging if the first power supply section 10 generates a voltage less than the predetermined voltage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power consumption and overcurrent display device that detects and displays power consumption and overcurrent flowing in a load such as an electrical product connected to an outlet.

  Standby power consumed by electrical appliances connected to an electrical outlet (for example, televisions and air conditioners that stand by in preparation for remote control input operations) when not in use is approximately 180 kWh as of 2007 on average for Japanese households. / Year / household, which is equivalent to approximately one month of power consumption of ordinary households. In addition, standby power for Japan as a whole is estimated to be 18.6 billion kWh, which is equivalent to the amount of power generated by three nuclear power plants. For this reason, in recent years, from the viewpoint of environmental protection, energy saving measures such as unplugging the outlet when the electrical equipment is on standby have been required.

  Under such circumstances, the development of measuring instruments for measuring standby power has progressed, and watt-hour meters for measuring the power of electrical equipment have been sold. However, there are many products whose power consumption of these measuring instruments themselves is 1.3 W or more, and there is a problem that a large standby power is consumed if the measuring instrument is attached to each outlet.

As an apparatus capable of detecting an overcurrent in addition to the standby power measurement, there is an invention disclosed in Patent Document 1, for example. The overcurrent alarm device of Patent Document 1 includes a device main body arranged inside a distribution board, the device main body detects current by a current transformer, and sends data to an overcurrent monitor connected via a communication line. Sending. The overcurrent monitor is provided with a sub-indicator as standby power display means in addition to a main indicator that displays overcurrent, thereby displaying the overcurrent and standby power detected from the distribution board.
JP 2005-77334 A

  However, the overcurrent display device of Patent Document 1 is unclear as to what means is used to operate the device, and the problem that a certain amount of power is required to measure standby power like the watt hour meter is solved. Not.

  In general, when an overcurrent alarm device is applied, the number of components tends to increase as shown in Patent Document 2. The table tap with an overcurrent alarm function of Patent Document 2 is an amplifier that amplifies a signal generated on the secondary side of a current transformer connected in series inside the table tap, and an AC / AC that converts the amplified AC signal into a DC voltage. It is composed of a DC converter, a stabilized power supply, a comparator, a voice synthesizer, a pulse oscillating device, an abnormality display lamp made up of LEDs and the like. For this reason, the circuit in the apparatus becomes complicated, and a large amount of power is consumed for the operation. In other words, there has been no apparatus that can measure standby power simultaneously with the detection of overcurrent from the viewpoint of reducing power consumption.

The present invention has been made in view of the above circumstances, and detects and displays overcurrent and standby power applied to a load connected to an outlet, and can operate with low power consumption and excessive power consumption. An object is to provide a current display device.
Japanese Utility Model Publication No. 05-62986

In order to achieve the above object, the present invention displays at least power consumption during standby of a connected load at an outlet connected to an electrical load, and detects an overcurrent during use of the connected load. Power consumption and overcurrent display device,
A display that displays power consumption or overcurrent status;
A control unit for connecting to the display unit and operating the display of the display unit;
A first power supply unit that detects a current flowing through the load and generates a voltage proportional to the detected current value;
A second power supply unit that intermittently charges from the power flowing through the load and supplies the stored power to the control unit,
The control unit stops charging by the second power supply unit when the first power supply unit generates a voltage that is equal to or higher than a predetermined value, and also controls the second power supply unit when the first power supply unit generates a voltage that is lower than the predetermined level. The timing is instructed so that charging is performed intermittently.

  According to such a configuration, the control unit intermittently charges the control unit itself by controlling the charging timing of the second power supply unit that operates the control unit and the display unit. Accordingly, it is possible to reliably detect and display the overcurrent and standby power applied to the load connected to the outlet while minimizing the power for operating the control unit and the display unit. Therefore, by using this power consumption and overcurrent display device, it is possible to urge the user to use standby power by the load without incurring power costs, and contribute to the reduction of power consumption accompanying environmental conservation. Can do.

  Further, it is preferable that the first power supply unit has a configuration in which the current is not detected when the load is not connected to the outlet, and the control unit and the display unit are not driven. With this configuration, when the load is not connected to the outlet, the power consumption and overcurrent display device does not operate, and the power consumption can be reduced to zero.

  Furthermore, the first power supply unit can be configured to include a current transformer that passes the current flowing through the load through the primary winding and generates a voltage in the secondary winding by dielectric. By using the current transformer in this way, a voltage proportional to the current flowing through the load can be easily generated.

  A control part can be set as the structure which detects the power consumption concerning a load, and an overcurrent using the voltage produced | generated in the 1st power supply part. Since the voltage generated in the first power supply unit is proportional to the current flowing through the load, the value of the current flowing through the load can be obtained by using the value of this voltage. As a result, the overcurrent applied to the load can be detected, and the voltage applied to the outlet is known in advance (for example, the general household voltage is AC 100 V), so the power consumption applied to the load can also be detected.

  In addition, the second power supply unit has a power storage unit including an electric double layer capacitor that stores the supplied power for a predetermined time, and the power storage unit can be charged with the power generated in the first power supply unit. It is preferable to do. Thus, by providing an electric double layer capacitor, the electric power generated in the first power supply unit can be efficiently stored. Moreover, since the electric power produced | generated in the 1st power supply part is not the electric power supplied from the outlet etc., a power consumption can be reduced significantly by operating a control part and a display part using this.

  As described above, according to the present invention, it is possible to reliably detect and display the overcurrent and standby power applied to the load connected to the outlet while minimizing the power for operating the control unit and the display unit. it can. Therefore, by using this power consumption and overcurrent display device, it is possible to inform the user of standby power usage by the load, etc. without incurring power costs, and to promote power saving, thus reducing power consumption associated with environmental conservation. Can contribute.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a development view showing an appearance of a power consumption and overcurrent display device according to an embodiment of the present invention, and FIG. 2 is a development view showing a state where the power consumption and overcurrent display device is similarly attached to an outlet. is there.
The power consumption and overcurrent display device of the present embodiment has a function of detecting the current of AC100V supplied to the outlet 100 from an external power supply source (not shown) and displaying it as overcurrent or power consumption. Yes. As shown in FIGS. 1 and 2, the power consumption and overcurrent display device includes a resin-molded device body 1, which is attached to an outlet 100 to which an electrical load (not shown) is connected. 101 is formed in a shape that can be directly attached to the top.

  The apparatus main body 1 includes a connection portion 3 that can be connected to an external power supply source and an outlet 100 via a wiring 2 on the bottom surface and inside thereof. Further, a control circuit 4 that performs operations such as current detection by being connected to the connection unit 3 is provided inside the apparatus main body 1, and a display unit 5 that displays overcurrent or power consumption is formed on the upper surface. .

  The connection unit 3 includes a power supply side terminal 6, an outlet power supply side terminal 7, a grounding side terminal 8, and an outlet grounding side terminal 9 on the lower surface of the apparatus body 1. The wiring 2 connected to the power supply source and the outlet 100 is connected to a connection fitting inside the apparatus main body 1 by being inserted into these terminals. As a result, the control circuit 4 is electrically connected, and the control circuit 4 can detect the current supplied from the power supply source to the outlet 100.

  The display unit 5 includes an overcurrent display LED 50 and a power display LCD (liquid crystal panel) 51. The overcurrent display LED 50 is lit when an overcurrent applied to the load is detected, and one power display LCD 51 displays the power consumption during normal use of the load or during standby according to the number of lighting of a plurality of bars arranged. To do. The control circuit 4 is configured to operate the display of the display unit 5.

FIG. 3 is a block diagram schematically showing the internal configuration of the power consumption and overcurrent display device according to this embodiment, and FIG. 4 is a circuit diagram showing the circuit configuration of the power consumption and overcurrent display device. .
As shown in FIG. 3, the control circuit 4 of the present embodiment includes a first power supply unit 10, a second power supply unit 20, and a control unit 30, and is connected from the control unit 30 to the display unit 5. Further, the outlet 100 is electrically connected to the power supply side terminal 6 and the ground side terminal 8 via the first power supply unit 10 and the second power supply unit 20.

  As shown in FIGS. 3 and 4, the first power supply unit 10 includes a power supply generation unit 11 and a current detection unit 12. The power generation unit 11 includes a current transformer CT1 therein, the primary winding of the current transformer CT1 is connected between the power supply side terminal 6 and the outlet power supply side terminal 7, and the secondary winding is forward voltage (VF). ) Having a low Schottky barrier diode D1-D4. In the current transformer CT1, electric power is induced in the secondary winding by the current flowing through the primary winding. The electric power generated by the secondary winding is rectified in the full-wave rectifier circuit and sent to the power storage unit 23 of the second power supply unit 20 through the backflow prevention diode D6.

The current detection unit 12 is composed of a dividing resistors R6, R7 and a smoothing capacitor C1, by using the DC voltage V ₀ which is rectified in the full-wave rectifier circuit, a current value flowing in the load connected to the outlet 100 Can be detected.

  The power storage unit 23 is provided with a three-terminal regulator Q3, and the power output from the first power supply unit 10 is input to the three-terminal regulator Q3. The three-terminal regulator Q3 of this embodiment is configured as a constant voltage circuit with an output voltage of 3V. The output Vout of the three-terminal regulator Q3 is used as a power source for driving the control unit 30.

The control unit 30 is preferably a one-chip microcomputer that consumes very little power. For example, the control unit 30 of the present embodiment uses a microcomputer whose current consumption is 7 μA when the system clock is driven at 31.25 KHz and the power supply voltage is 2 V. The control unit 30 is programmed to measure the voltage Vs applied to the current detection unit 12 to calculate power consumption, and to transmit the calculation result as a signal to the display unit 5 (overcurrent display LED 50, power display LCD 51). ing. The control unit 30 of the present embodiment is configured to start driving when a voltage of 2 V or more is applied to the power input pin (14 pin in FIG. 4) as the output Vout from the three-terminal regulator Q3. .
The control unit 30 is also connected to the second power supply unit 20 and can control the operation of the second power supply unit 20.

  The second power supply unit 20 includes a diode bridge unit 21, an intermittent charge control unit 22, and a power storage unit 23. The diode bridge portion 21 includes a diode bridge circuit D5 therein, and one of the AC input terminals is connected to the power supply side terminal 6 via the current limiting resistor R1, and the other AC input terminal is connected to the ground side terminal 8. It is connected. In the diode bridge unit 21, power supply from the power supply side terminal 6 is controlled by the intermittent charge control unit 22.

  The intermittent charge control unit 22 includes a PNP transistor Q1, an NPN transistor Q2, bias setting resistors R2, R3, and R4 of each transistor, and a base current limiting resistor R5. The base of the NPN transistor Q2 is connected to the control unit 30 via the base current limiting resistor R5, and the NPN transistor Q2 switches on and off between the collector and the emitter based on a signal from the control unit 30. On the other hand, PNP transistor Q1 has an emitter connected to the plus side of diode bridge circuit D5 and a collector connected to power storage unit 23. The base is connected to the collector of the NPN transistor Q2, and is reverse-biased by the base-emitter bias resistor R2. When the NPN transistor Q2 is turned on, the PNP transistor Q1 draws the base current of the PNP transistor Q1, and turns on the collector-emitter of the PNP transistor Q1. As a result, the diode bridge unit 21 and the power storage unit 23 are energized.

The power storage unit 23 includes the three-terminal regulator Q3 as described above, and further, the input voltage smoothing capacitor C2, the oscillation preventing capacitors C3 and C4, the electric double layer capacitor C5, and the reference voltage recording capacitor C6 of the three-terminal regulator Q3. , A backflow prevention diode D7.
The DC voltage that has been full-wave rectified in the diode bridge portion 21 is charged into the electric double layer capacitor C5 via the three-terminal regulator Q3. As the electric double layer capacitor C5 of the present embodiment, a capacitor having a capacity about 1000 times that of a normal capacitor is applied, and the charged power can be used as a power source of the control unit 30. On the other hand, the reference voltage recording capacitor C6 is connected in parallel with the electric double layer capacitor C5 via the backflow prevention diode D7, and functions as a reference voltage for comparing the stored voltage of the electric double layer capacitor C5.

  The control unit 30 is configured to control the timing for charging the electric double layer capacitor C5 with electric power. Specifically, a voltage drop of the electric double layer capacitor C5 is detected by the AD conversion function of the control unit 30. When the voltage drops below a specified voltage (for example, 3V), charging can be instructed.

Next, the operation of the power consumption and overcurrent display device of this embodiment will be described.
In the outlet 100 to which the power consumption and overcurrent display device is attached, the power source side terminal 6 and the ground side terminal 8 are energized through the outlet power source side terminal 7 and the outlet ground side terminal 9 when a load is connected. . As a result, the power consumption and overcurrent display device allows the current flowing through the load to pass through the primary side winding of the current transformer CT1, and the voltage proportional to the current value becomes secondary by being dielectrically generated in the primary side winding. Occurs in the side winding. Power generated by the current transformer CT1 is a Schottky barrier diode D1-D4 DC voltage V ₀ becomes rectified in full-wave rectifier circuit, it is inputted to the 3-terminal regulator Q3 through the diode for preventing reverse current D6. This electric power is supplied to the one-chip microcomputer power supply pin of the control unit 30 as the output Vout from the three-terminal regulator Q3.

FIG. 5 is a table showing the relationship between the current flowing through the load and the voltage applied to each component of the control circuit in the power consumption and overcurrent display device according to the present embodiment.
In the power consumption and overcurrent display device, when a load is connected to the outlet 100, a voltage as shown in FIG. 5 is applied to the A / D conversion input pin of the control circuit 4 in accordance with the current flowing through the load. Here, when the load current flows 0.6 A (load power is 60 W) or more, the secondary winding of the current transformer CT1 becomes a voltage of 2 V or more, and the voltage of 2 V or more is supplied to the control unit 30 via the three-terminal regulator Q3. The one-chip microcomputer of the control unit 30 starts driving by the auto reset function.

  The control unit 30 outputs a pulse signal from a pin (16 pin in FIG. 4) connected to the intermittent charge control unit 22 when driving is started. This pulse signal is programmed to hold the H state for 1 second and switch to L when switching from Low (hereinafter referred to as L) to High (hereinafter referred to as H). The output of the three-terminal regulator Q3 is charged to the electric double layer capacitor C5 and the reference voltage recording capacitor C6 when the control unit 30 starts driving.

  The pulse signal whose 16-pin output of the control unit 30 becomes H is sent to the intermittent charge control unit 22 and input to the base of the NPN transistor Q2 via the base current limiting resistor R5. As a result, the NPN transistor Q2 is turned on between the collector and the emitter. Also, the PNP transistor Q1, which has been reversely biased by the bias resistor R2 and turned off between the collector and the emitter, draws a base current in response to the NPN transistor Q2 being turned on, and the collector- Turn on between emitters.

When the collector-emitter of the PNP transistor Q1 is turned on, the power generated on the plus side of the diode bridge circuit D5 connected to the emitter side of the PNP transistor Q1 can be transmitted to the power storage unit 23. Become. This electric power is charged into the electric double layer capacitor C5 and the reference voltage recording capacitor C6 via the three-terminal regulator Q3.
The charging time of the electric double layer capacitor C5 and the reference voltage recording capacitor C6 is the time during which the PNP transistor Q1 is turned on, and thus the time (1 second) of the state of the pulse signal H transmitted from the control unit 30. .
The one-chip microcomputer of the control unit 30 is driven only by the electric power stored in the electric double layer capacitor C5 after the start of driving by the auto reset function.

  When time elapses while the control unit 30 is driven, the electric power of the electric double layer capacitor C5 is gradually consumed, and the voltage drops. For this reason, the control unit 30 inputs the voltage stored in the reference voltage recording capacitor C6 from the 18th pin of the A / D conversion function of the control unit via the current limiting resistor R8, and determines the voltage of the electric double layer capacitor C5. The voltage stored in the reference voltage recording capacitor C6 is compared. The control unit 30 of the present embodiment is configured to shift the 16-pin output of the control unit 30 from L to H when the voltage of the electric double layer capacitor C5 drops to 70% with respect to the voltage of the reference voltage recording capacitor C6. It is said.

  When the control unit 30 shifts the 16-pin output from L to H, the pulse signal that has become H flows to the base of the NPN transistor Q2 via the base current limiting resistor R5, and the collector-emitter is turned on. As a result, the collector-emitter of the PNP transistor Q1 is also turned on, and the electric power generated on the plus side of the diode bridge circuit D5 can be charged again to both the electric double layer capacitor C5 and the reference voltage recording capacitor C6.

The timing at which the control unit 30 charges the voltage in the electric double layer capacitor C5 can be obtained by the following calculation process.
For example, when the withstand voltage (V) of the electric double layer capacitor C5 is 3.3V and the capacitance (C) is 0.22F, the charge amount (Q0) is 0.73 clones according to the following equation (1).
Q0 = CV1 (1)

Here, if the charging current (i) is 100 mA, the time (t) required from full charging to full charging is 7.26 seconds according to the following equation (2).
t = Q0 / i (2)
However, the time (t) required for full charge (V1) from the voltage (V2) dropped to 3V is 0.66 seconds according to the following equation (3).
t = C (V1-V2) / i (3)

In addition, since the current consumption when measuring the power consumption and the current consumption of the overcurrent display device is 100 μA or less, the time (t) that can be discharged to the specified voltage drop is 10 minutes and 55 seconds according to the following equation (4).
t = −C · R · Ln (V2 / V1) (4)
That is, the control unit 30 can stably charge power to the electric double layer capacitor C5 by repeating the charge instruction for 0.66 seconds at intervals of about 11 minutes to the intermittent charge control unit 22. The control unit 30 of the present embodiment holds the H state for 1 second as a pulse signal, and is configured to reliably charge the electric double layer capacitor C5. When the program of the control unit 30 is set in this way, it is possible to stably operate the power consumption and overcurrent display device with the minimum power consumption.

In addition, the power consumption required to make the dropped voltage (V2) full charge (V1) can be calculated | required by following Formula (5).
_{P = I · V2 · (t} 0/3600) ··· (5)
Therefore, the power consumption and the power consumption of the overcurrent display device are 0.06 Wh.

  When the current flowing through the load is less than 5 A, the control unit 30 repeatedly performs the intermittent charging to the electric double layer capacitor C5. In this way, the control unit 30 itself controls the charging timing of the electric double layer capacitor C5 that operates the control unit 30 and the display unit 5, whereby electric power is stably supplied to the control unit 30 and the display unit 5. Therefore, even if the load connected to the outlet 100 is in the standby state, the standby power applied to the load can always be detected and displayed.

In addition, when a load current of 5 A or more flows, power is sufficiently supplied from the current transformer CT1 of the power generation unit 11, and the electric double layer capacitor C5 can always be charged. For this reason, the control unit 30 is configured to stop the charging instruction to the intermittent charge control unit 22.
Thus, since the current transformer CT1 can generate electric power according to the load current flowing through the outlet 100, it can be used for charging the electric double layer capacitor C5, so that power consumption can be greatly reduced.

  When the load is not connected, the current path of the outlet 100 is cut off, so that the power consumption and the current detected by the overcurrent display device are zero. As a result, in the power consumption and overcurrent display device, the control unit 30 and the display unit 5 are not driven, and the power consumption can be reduced to zero.

  The power consumption and overcurrent applied to the load connected to the outlet 100 are detected by detecting the voltage generated by the current transformer CT1 in the voltage dividing resistors R6 and R7 and the smoothing capacitor C1 of the current detector 12. When a voltage proportional to the value of the current flowing through the primary winding is generated in the secondary winding of the current transformer CT1, it is sent to the current detector 12 as a DC voltage signal by the full-wave rectifier circuit. The voltage Vs applied to the current detection unit 12 is input to a pin (17 pin in FIG. 4) having an A / D conversion function of the control unit 30. The control unit 30 calculates the result of A / D conversion of the voltage Vs and displays it on the power display LCD 51 as power consumption.

  As shown in FIG. 5, when the power consumption of the load connected to the outlet 100 is 0.5 W to 1.0 W, the display by the power display LCD 51 of the power consumption and overcurrent display device of this embodiment is a power display. The characters “Waiting power consumption” on the LCD 51 blink, and a plurality of bars of the power display LCD 51 are sequentially lit from 5 W to 900 W. Thereby, the user can know the power consumption applied to the outlet 100 when the load is used or during standby.

  Further, when the control unit 30 determines from the detection result of the voltage Vs that the overcurrent value preset in the outlet 100 is approaching, the overcurrent display LED 50 is turned on as overcurrent detection. When the current of the load connected to the outlet 100 is 10A to 12A, the display by the overcurrent display LED 50 of the present embodiment repeats the fade-in / fade-out blinking by the overcurrent display LED 50 at intervals of 2 seconds to call attention. When the current is 13 A or more, the overcurrent display LED 50 blinks at intervals of 0.2 seconds, and informs that it is dangerous if the load beyond this increases.

Next, a method for using the power consumption and overcurrent display device of this embodiment will be described.
FIG. 6 is a front view schematically showing the power consumption and wiring of the overcurrent display device according to this embodiment, and FIG. 7 is a rear view of FIG.
As shown in FIG. 6, the outlet 100 including the power consumption and overcurrent display device is connected to a distribution board (power supply source) 200 via an indoor wiring. Specifically, as shown in FIGS. 2 and 7, the power supply side terminal 6 of the apparatus main body 1 is connected to the distribution board 200 via the power supply side line 201, and the ground side terminal 8 is connected via the ground side line 202. Connected to distribution board 200. On the other hand, the outlet power supply side terminal 7 is connected to the power supply side terminal of the outlet 100 via the in-outlet wiring power supply side line 203, and the outlet grounding side terminal 9 is connected to the grounding of the outlet 100 via the in-outlet wiring grounding side line 204. Connected to the side terminal. By wiring in this way, the power consumption and overcurrent display device can display the power consumption and overcurrent described above.

  Further, as shown in FIGS. 6 and 7, a plurality of outlets 100 are connected by connecting wires 205 and 206, thereby consuming the entire load applied to each outlet 100, 100 ′, 100 ″,. It is possible to detect power and overcurrent. Specifically, the apparatus main body 1 that is directly connected to the distribution board 200 is connected to the outlet 100 via the in-outlet wiring power supply side line 203 and the in-outlet wiring ground side line 204. Further, the apparatus main body 1 ′ connected to the next outlet 100 ′ is connected to the outlet 100 via the transition wiring power supply side line 205 and the transition wiring ground side line 206. With this connection, the power consumption and overcurrent display device in the outlet 100 can detect the power consumption and overcurrent including the load of the outlet 100 and the load of the outlet 100 ′. Further, by connecting the third outlet 100 ″ in the same manner, the power consumption and overcurrent display device in the outlet 100 can be connected to the load of the outlet 100, the load of the outlet 100 ′, and the outlet 100 ″. Included power consumption and overcurrent can be detected

  In this way, the power consumption and overcurrent display device detects standby power consumption and overcurrent of the entire load on each outlet 100, 100 ′, 100 ″,. Can be made more conscious to the user.

  As described above, according to the power consumption and overcurrent display device of the present embodiment, the overcurrent and standby power applied to the load connected to the outlet 100 are reliably ensured while minimizing the power for operating the control unit 30 and the display unit 5. Can be detected and displayed. Therefore, by using this power consumption and overcurrent display device, it is possible to urge the user to use standby power by the load without incurring power costs, and contribute to the reduction of power consumption accompanying environmental conservation. Can do.

It is an expanded view which shows the external appearance of the power consumption and overcurrent display apparatus which concern on this embodiment. It is an expanded view which shows the state which attached the power consumption and overcurrent display apparatus which concern on this embodiment to the outlet. It is a block diagram which shows roughly the internal structure of the power consumption and overcurrent display apparatus which concern on this embodiment. It is a circuit diagram which shows the circuit structure of the power consumption and overcurrent display apparatus which concern on this embodiment. In the power consumption and overcurrent display device according to the present embodiment, it is a table showing the relationship between the current flowing through the load and the voltage applied to each configuration of the control circuit. It is a front view which shows roughly the wiring of the power consumption and overcurrent display apparatus which concern on this embodiment. FIG. 7 is a rear view of FIG. 6.

Explanation of symbols

1: device main body, 2: wiring, 3: connection unit, 4: control circuit, 5: display unit, 6: power supply side terminal, 7: outlet side terminal (power supply side), 8: ground side terminal, 9: outlet side Terminal (ground side),
10: first power supply unit, 11: power supply generation unit, 12: current detection unit,
20: second power supply unit, 21: diode bridge unit, 22: intermittent charge control unit, 23: power storage unit,
30: control unit,
50: Overcurrent display LED, 51: Power display LCD
100: outlet, 101: mounting frame,
200: Distribution board (power supply source), 201: Power supply side line, 202: Grounding side line, 203: Outlet wiring power supply side line, 204: Outlet outlet wiring grounding side line, 205: Crossover wiring power supply side line, 206: Crossing wiring grounding side line ,
CT1: current transformer,
C5: Electric double layer capacitor,
C6: reference voltage recording capacitor,
D5: Diode bridge circuit,
Q1: PNP transistor,
Q2: NPN transistor,
Q3: Three-terminal regulator

Claims (5)

A power consumption and overcurrent display device that displays at least the standby power consumption of the connected load at the outlet connected to the electrical load and detects and displays the overcurrent when the connected load is used. And
A display that displays power consumption or overcurrent status;
A control unit for connecting to the display unit and operating the display of the display unit;
A first power supply unit that detects a current flowing through the load and generates a voltage proportional to the detected current value;
A second power supply unit that intermittently charges from the power flowing through the load and supplies the charged power to the control unit,
The control unit stops charging by the second power supply unit when the first power supply unit generates a voltage that is equal to or higher than a predetermined level, and when the first power supply unit generates a voltage that is lower than the predetermined level, A power consumption and overcurrent display device characterized by instructing the timing so that charging by the second power supply unit is intermittently performed. 2. The power consumption and overcurrent display device according to claim 1, wherein the first power supply unit does not detect a current when the load is not connected to an outlet, and the control unit and the display unit are not driven. . 3. The power consumption according to claim 1, wherein the first power supply unit includes a current transformer that passes a current flowing through a load through a primary winding and generates a voltage in a secondary winding by dielectric. Overcurrent display device. The said control part detects the power consumption and overcurrent concerning a load using the voltage produced | generated in the said 1st power supply part, The power consumption and overcurrent as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. Current display device. The second power supply unit has a power storage unit including an electric double layer capacitor for storing the supplied power for a predetermined time,
5. The power consumption and overcurrent display device according to claim 1, wherein the power storage unit is configured to be capable of storing both power generated in the first power supply unit.

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