A power strip includes a casing including a plurality of plug insertion portions each having a first insertion port and a second insertion port into which first and second plug blades of a socket plug are to be respectively inserted, a magnetic core which is provided in each of the plurality of plug insertion portions and includes a first opening into which the first plug blade is to be inserted, a second opening into which the second plug blade is to be inserted, and a slit to communicate between the first plug blade and the second plug blade, and a magnetic sensor provided inside the slit.
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1. A power strip comprising:
a casing which includes a plurality of plug insertion portions each having a first insertion port and a second insertion port into which first plug blade and second plug blade of a socket plug are to be respectively inserted;
a magnetic core which is provided to correspond with each of the plurality of plug insertion portions and includes a first opening into which the first plug blade is to be inserted, a second opening into which the second plug blade is to be inserted, and a slit by which the first opening and the second opening communicate; and
a magnetic sensor provided in the slit.
18. An electrical power measurement system comprising:
a power strip including a plurality of plug insertion portions into which socket plugs of external electrical devices are to be respectively inserted, the power strip supplying a power-supply voltage to each of the plug insertion portions;
a magnetic core provided in each of the plug insertion portions and having a slit;
a magnetic sensor provided in the slit and measures a current flowing through a first plug blade and a second plug blade of the socket plug; and
a computer for calculating power consumptions of a plurality of electrical devices connected to the plug insertion portions, the power being calculated for each of the electrical devices by multiplying the measured current by the power-supply voltage, wherein
the magnetic core has a first opening into which the first plug blade is to be inserted and a second opening into which the second plug blade is to be inserted, and the first opening and the second opening are communicating by the slit.
2. The power strip according to
the first opening has a rectangular shape which extends in a first direction in a plan view,
the second opening has a rectangular shape which extends in a second direction parallel to the first direction in the plan view, and
the slit has a rectangular shape which extends in a third direction perpendicular to each of the first direction and the second direction in the plan view.
3. The power strip according to
4. The power strip according
5. The power strip according
6. The power strip according to
7. The power strip according to
the magnetic core is provided between the inner surface of the casing and the circuit board and is fixed on the casing by pressing force applied from the circuit board.
9. The power strip according to
10. The power strip according to
a rib is provided to stand on an inner surface of the casing, and
the magnetic core is clamped by the rib.
11. The power strip according to
an outer shape of the magnetic core is rectangular, and
a plurality of the ribs are provided, and the magnetic core is clamped by the ribs from diagonal directions of the magnetic core.
13. The power strip according to
14. The power strip according to
an extended portion provided at the rib; and
a claw provided at an end of the extended portion, wherein
a third hole into which the extended portion is inserted is formed in the circuit board, so that a principal surface of the circuit board is held by the claw.
15. The power strip according to
16. The power strip according to
a first bus bar electrically connected to one pole of a power source;
a plurality of first contacts which is integrally provided to the first bus bar and receives the first plug blade;
a second bus bar electrically connected to the other pole of the power supply; and
a plurality of second contacts which is integrally provided to the second bus bar and receives the second plug blade, wherein
the first bus bar and the second bus bar are each manufactured by bending conductive plates each having a same planar shape.
17. The power strip according to
the plug insertion portion includes a third insertion port into which an earth terminal of the socket plug is to be inserted,
the power strip further comprises a third bus bar which is kept at a ground potential and includes a plurality of third contacts, and
the first bus bar, the second bus bar, and the third bus bar are each manufactured by bending conductive plates each having a same planar shape.
19. The electrical power measurement system according to
20. The electrical power measurement system according to
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This application is continuation application of International Application PCT/JP2011/58640 filed on Apr. 5, 2011 and designated the U.S., the entire contents of which are incorporated by reference.
It is related to a power strip and an electrical power measurement system.
Recently, with an increase in the electricity demand and the consciousness of the global environment, there has been a rising momentum in saving power consumption in households and offices. With such growing sense of saving energy, such efforts is made that electric devices are frequently turned off and a setting temperature of an air conditioner is readjusted.
Various methods of measuring power consumption are proposed to grasp how much energy is actually saved with these efforts.
However, it is difficult in any of these methods to accurately measure a power consumption of an individual electrical device.
For example, a method is proposed in which a terminal to measure power consumption is provided in a home socket so as to measure the current power consumption of an electrical device connected to the socket. However, in this method, in the case where a power strip is connected to one wall power and a plurality of electrical devices are connected to the power strip, there is a problem that only the total amount of the power consumptions of the electrical devices can be measured, and the power consumption of each electrical device cannot be individually measured.
Also, there is a method in which a current sensor for measuring power consumption is provided to a power wire before being branched by a home distribution board. However, in this method, it is impossible to see how much power is consumed by each power wire after being branched by the distribution board.
Technologies relating to the background arts are disclosed in JPA 9-84146, JPA 10-97879, JPA 11-108971, and JPA 11-313441.
According to one aspect of the following disclosure, there is provided a power strip having a casing which includes a plurality of plug insertion portions each having a first insertion port and a second insertion port into which first plug blade and second plug blade of a socket plug are to be respectively inserted, a magnetic core which is provided to correspond with each of the plurality of plug insertion portions and includes a first opening into which the first plug blade is to be inserted, a second opening into which the second plug blade is to be inserted, and a slit by which the first opening and the second opening communicate, and a magnetic sensor provided in the slit.
According to another aspect of the following disclosure, there is provided an electrical power measurement system having a power strip including a plurality of plug insertion portions into which socket plugs of external electrical devices are to be respectively inserted, the power strip supplying a power-supply voltage to each of the plug insertion portions, a magnetic core provided in each of the plug insertion portions and having a slit, a magnetic sensor provided in the slit and measures a current flowing through a first plug blade and a second plug blade of the socket plug, and a program which calculates power consumptions of a plurality of electrical devices connected to the plug insertion portions, the power being calculated for each of the electrical devices by multiplying the measured current by the power-supply voltage, wherein the magnetic core has a first opening into which the first plug blade is to be inserted and a second opening into which the second plug blade is to be inserted, and the first opening and the second opening are communicating by the slit.
The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention.
The power strip 1 includes a socket plug 2, a power cord 3, a lower casing 5, and an upper casing 6.
Among them, the upper casing 6 is provided with a plurality of plug insertion portions 1a corresponding to a socket plug 7. The socket plug 7 is provided to an external electrical device, and has a first plug blade 8, a second plug blade 9, and an earth terminal 10.
The plug insertion portions 1a includes a first insertion port 6a into which the first plug blade 8 is inserted, a second insertion port 6b into which the second plug blade 9 is inserted, and a third insertion port 6c into which the earth terminal 10 is inserted.
In the above-described power strip 1, when the socket plug 2 is inserted into a socket that is installed on the wall or the like, a voltage of an alternating-current power source of the installed plug socket is supplied to each plug insertion portion 1a via the power cord 3.
As illustrated in
Among these bus bars 11 to 13, the first bus bar 11 and the second bus bar 12 are respectively electrically connected to each poles A− and A+ of the alternating-current power source AC on the wall or the like via the power cord 3 (see
Also, a first circuit board 20 is provided above the bus bars 11 to 13.
A plurality of magnetic cores 21 each corresponding to the socket plug 7 is provided on the first circuit board 20.
As illustrated in
Also, the third bus bar 13 has a plurality of third contacts 13s which receive the earth terminal 10.
As illustrated in
The earth terminal 10 of the socket plug 7 is in contact with the third contact 13a.
As illustrated in
When the magnetic cores 21 are mounted, as illustrated in
As illustrated in
As illustrated in
The number of parts can be reduced compared with the case where the magnetic core 21 are separately fixed, by fixing the plurality of magnetic cores 21 by using only a single first circuit board 20. Accordingly, the cost can be reduced, and the power strip can be easily assembled.
Note that the mounting method using the screws 71 is employed in second to fourth embodiments to be described later.
As illustrated in
These openings 21a and 21b have a rectangular shape in a plan view, and extending directions L1 and L2 of the openings 21a and 21b are parallel with each other.
A rectangular slit 21c through which these openings 21a and 21b are communicated is provided between the openings 21a and 21b. The shape of the slit 21c is rectangular in a plan view, and the extending direction L3 of the slit 21c is perpendicular to the extending directions L1 and L2 of the respective openings 21a and 21b. Accordingly, the openings 21a and 21b are combined with the slit 21c to form a substantially H shape in a plan view.
Also, a width W3 of the slit 21c is narrower than each of widths W1 and W2 of the respective plug blades 8 and 9. In the embodiment, the width W3 is set to approximately 1.4 mm.
Although the material of the magnetic core 21 is not particularly limited, ferrite that is easily available is used in the present embodiments.
As illustrated in
A Hall element as the magnetic sensor 22 is soldered on the first circuit board 20. The magnetic sensor 22 is housed in the slit 21c and functions to measure a value of current flowing through the plug blades 8 and 9 based on the intensity of a magnetic field in the slit 21c.
As illustrated in
When the magnetic sensing unit 23 is exposed to a magnetic field in the state where a voltage Vcc is applied between a power terminal 22a and an earth terminal 22b, the magnetic sensing unit 23 generates a potential difference ΔV according to the intensity of the magnetic field. The potential difference ΔV is amplified in the differential amplifier 24 and then is output to the external.
As illustrated in
Note that each of the terminals 22a to 22c is electrically connected to a wire in the first circuit board 20 (see
The Hall element which is used as the magnetic sensor 22 is smaller than other elements such as a current transformer. Thus, the size of the power strip is not likely to increase.
Furthermore, the current transformer measures an intensity of the magnetic field by utilizing an inductive current which is generated according to a temporal change of the magnetic field. Thus, a measurement target of the current transformer is limited to an alternating-current magnetic field. However, the Hall element has an advantage of being capable of measuring an intensity of a static magnetic field.
In addition, the Hall element is less expensive than the current transformer. Thus, the cost of the power strip can be prevented from increasing.
Normal direction n of the magnetic sensing surface PM is perpendicular to the extending direction D1 of each of the first plug blade 8 and the second plug blade 9, namely a depth direction of each of the openings 21a and 21b. With this configuration, a magnetic field H1 which is generated by a current I flowing through each of the plug blades 8 and 9 passes through the magnetic sensing surface PM substantially vertically, and thus a current detection sensitivity of the magnetic sensor 22 is improved.
The first magnetic flux Φ1 and the second magnetic flux Φ2 are generated in the magnetic core 21 in the peripheries of the plug blades 8 and 9 by currents I flowing through the plug blades 8 and 9.
The current I is first supplied to an external electrical device through one of the plug blades 8 and 9, and then returns through the other plug blade. Thus, the directions of the currents I flowing through the plug blades 8 and 9 become opposite to each other. Accordingly, a direction of one of the magnetic fluxes Φ1 and Φ2 becomes clockwise and the other becomes counterclockwise.
As a result, the directions of the magnetic fluxes Φ1 and Φ2 become substantially the same in the vicinity of the slit 21c between the plug blades 8 and 9. For this reason, the magnetic field H1 which is generated in the slit 21c by these magnetic fluxes Φ1 and Φ2 is intensified to have a higher intensity as compared with a magnetic field which is generated only from one of the plug blades 8 and 9.
Accordingly, even when an intensity of the current I is small, the magnetic field H1 having an intensity large enough to be detected by the magnetic sensor 22 (see
Moreover, as illustrated in
Accordingly, the magnetic field H1 can be concentrated in the magnetic sensor 22, so that the accuracy in measuring the current I by the magnetic sensor 22 can be further improved.
The above-described improvement of the measurement accuracy is particularly effective, when an external electrical device is in a stand-by state with a power consumption of 1 W or less and thus the intensity of the current I is weak.
Furthermore, in the case where the plug blades 8 and 9 are not inserted into the plug insertion portion 1a (see
As illustrated in
A connector 36 is provided in the second circuit board 25 and is connected to a communication cable 37.
The communication cable 37 has an end portion which is connected to a connection portion C of the first circuit board 20. The communication cable 37 has a function of taking power required for driving each magnetic sensor 22 from the power cord 3 and supplying the power to the first circuit board 20, and a function of transmitting an output signal of each magnetic sensor 22 to the second circuit board 25.
Note that the transmission circuit unit 27 may be provided in the lower casing 5 as illustrated in
In this case, the second circuit board 25 is provided in the transmission circuit unit 27 of the lower casing 5. Then, the communication cable 37 may be connected to the connector 36 of the second circuit board 25, and an end portion of the communication cable 37 is connected to the connection portion C (see
As illustrated in
The transmission circuit unit 27 functions as follows.
First, an analog current signal SIA in response to the intensity of the current I flowing through the plug blades 8 and 9 is output from each magnetic sensor 22 via the output terminal 22c (see
The analog current signal SIA, which is an analog value, is digitalized in the AD converter 32 to be a digital current signal SID.
The periodic sensor 31 is a photo coupler, for example, which detects a cycle of alternating-current power flowing through the power code 3 connected to the alternating-current power source AC, and then outputs a periodic signal Sp rising from “0” to “1” in synchronization with the cycle. For example, when the cycle of the alternating-current power is 50 Hz, the periodic signal Sp also rises from “0” to “1” at the cycle of 50 Hz.
The calculating unit 33 measures a rising cycle of a signal in the above-described periodic signal Sp and identifies the cycle as a cycle T of the alternating-current power. Furthermore, the calculating unit 33 uses 64/T as a sampling frequency and takes the digital current signal SID at the sampling frequency.
Although the calculating unit 33 is not particularly limited, an 8-bit MPU (Micro Processing Unit) is used in this embodiment.
Then, the calculating unit 33 formats the digital current signal SID into USB (Universal Serial Bus) standards, which is output as an output signal Sout to the output port 34.
Note that the standards of the output signal Sout are not limited to the USB standards. The output signal Sout can be formatted into any standards such as wired LAN (Local Area Network) or wireless LAN.
Also, a multiplier may be provided in the calculating unit 33. In this case, a power supply voltage of the alternating-current power source AC may be multiplied by the digital current signal SID in the multiplier so as to obtain an amount of power consumed by an electrical device connected to each of the plug insertion portions 1a.
Next, the electrical power measurement system utilizing the power strip 1 is described.
As illustrated in
Then, socket plugs 41a to 44a of first to fourth electrical devices 41 to 44 are respectively inserted into the plug insertion portions 1a of the power strip 1. Note that not all of the plug insertion portions 1a have to be connected to the electrical devices. Some of the plug insertion portions 1a may remain unused.
Furthermore, a computer 46 such as a personal computer and the output port 34 of the power strip 1 are connected via a signal cable 45 such as a USB cable.
With this configuration, a value of each current, which is supplied from each plug insertion portion 1a to the electrical devices 41 to 44, is taken into the computer 46, as the above-described output signal Sout.
The computer 46 is provided with a storage unit 46a such as a hard disk. In addition, the storage unit 46a stores a program 47 which calculates individual power consumptions of the electrical devices 41 to 44 for each of the electrical devices 41 to 44 by multiplying the power-supply voltage of the wall power 48 by the current contained in the output signal Sout.
A method of storing the program 47 in the storage unit 46a is not particularly limited. For example, an unillustrated CD (Compact Disk) driver which is provided in the computer 46 may be used so that the computer 46 reads the program 47 stored in a storage medium 49 such as a CD and then the program 47 is stored in the storage unit 46a.
When being used, the program 47 is loaded onto a RAM (Random Access Memory) 46b, and the calculating unit 46c such as a CPU utilizes the program 47 to calculate the individual power consumptions of the electrical devices 41 to 44. Then, the calculation result for each of the plug insertion portions 1a is displayed on a monitor 50.
Note that, when the calculating unit 33 (see
Thus, the user can grasp a power consumption of each of the electrical devices 41 to 44 in real time by monitoring the monitor 50. Therefore, the user can obtain information for deciding whether the power of each of the electrical devices 41 to 44 should be reduced for saving energy.
Also, a database 46d may be provided in the computer 46 to store the total power of the electrical devices 41 to 44 within a predetermined period in the database 46d. With this, the information for deciding whether the power should be reduced can be further increased.
According to this embodiment described above, as described referring to
Furthermore, as illustrated in
Therefore, a weak current I can be more easily measured with the magnetic sensor 22 as compared with the case where the magnetic field which is generated only by the current I flowing through the one of the plug blades 8 and 9. Thus, a sensitivity of detecting a current by the magnetic sensor 22 can be improved.
Furthermore, a measuring target of the magnetic sensor 22 is a magnetic field H1 which is generated in the peripheries of the plug blades 8 and 9. Thus, the magnetic cores 21 to converge the magnetic field H1 may be provided above the bus bars 11 to 13 as illustrated in
In addition, the magnetic field H1 can be measured without connecting new parts to the bus bars 11 to 13. Thus, the cost of the power strip 1 can be also prevented from increasing.
This embodiment describes a preferred positional relationship between the magnetic sensor 22 and the magnetic core 21.
As illustrated in
As illustrated in
For this reason, in order to ensure an accuracy of measuring the magnetic field by the magnetic sensor 22, it is preferable that a magnetic-sensing portion 23 be positioned in a vicinity of the center C where a spatial variation of the magnetic field is small.
Note that when the magnetic sensor 22 is mounted on the first circuit board 20 (see
For this reason, it is preferable that an area of the surface 21d be sufficiently larger than an area of the magnetic-sensing portion 23 so as to increase a region where the magnetic field is substantially uniform in the surface 21d to reduce the risk of the magnetic-sensing portion 23 being positioned in a region such as the edge 21e where the magnetic field rapidly changes.
For example, as illustrated in
This embodiment describes the upper casing 6 that is suitable for mounting the magnetic cores 21.
As illustrated in
As illustrated in
In this embodiment, the magnetic core 21 is clamped by the L-shaped ribs 6p as described above, and thus the upper core 6 and the magnetic core 21 can easily aligned, and the misalignment between the upper casing 6 and the magnetic core 21 in the assembled state can be prevented.
As illustrated in
Note that
In this embodiment, the ribs 6p are made tall as described above, so that the L-shaped ribs 6p fit in the third holes 20e of the first circuit board 20. Accordingly, not only the L-shaped ribs 6p can clamp the magnetic core 21, but also the misalignment between the first circuit board 20 and the upper casing 6 is prevented.
As illustrated in
Note that
In this embodiment, since the claw 6r is provided on the upper casing 6 as described above, a principal surface 20x of the first circuit board 20 is held by the claw 6r. Accordingly, the first circuit board 20 can be prevented from being misaligned in a normal direction of the principal surface 20x.
Furthermore, since the first circuit board 20 can be held by the claw 6r in this manner, the screw 71 (see
This embodiment describes a method of manufacturing the first to third bus bars 11 to 13 described in the first embodiment.
The conductive plate 55 is formed by processing a brass plate using a die and includes a plurality of protrusions 55a.
As illustrated in
As described above, in this embodiment, the first to third bus bars 11 to 13 can easily be manufactured by changing bending portions and bending directions in the conductive plate 55 having the same planar shape. Thus, the costs of manufacturing the bus bars 11 to 13 can be made low.
This embodiment describes an electrical power measurement system which is useful in a place where many users consume power, such as in an office or a business establishment.
An electrical power measurement system 100 has a plurality of the power strips 1 described in the first embodiment, repeaters 90, a data collecting server 91, a management server 92, and a building management system 98.
The repeater 90 aggregates output signals Sout which are output from the power strips 1. Then, the repeater 90 performs an IP (Internet Protocol) conversion on the signals Sout, and outputs them to the data collecting server 91.
The data collecting server 91 includes a collection unit 91a, an operation-power consumption integration unit 91b, and a visualizing processing unit 91c.
Among them, the collection unit 91a has a function as an input unit to receive the output signal Sout.
The operation-power consumption integration unit 91b refers to a schedule database 92a which is stored in the management server 92. The schedule database 92a stores schedules of users, and stores, for example, absent time of the users in the office.
The operation-power consumption integration unit 91b grasps the absent time of a user by referring to the schedule database 92a. Furthermore, the operation-power consumption integration unit 91b grasps the power consumption of the power strip 1 which is being consumed by the user, based on the output signal Sout. Then, the operation-power consumption integration unit 91b determines whether power is wasted when the user is absent.
The visualizing processing unit 91c creates image data Sp to visualize the determination of the operation-power consumption integration unit 91b.
The image data Sp is taken by a personal computer 99 of each user or an administrator through a LAN cable or the like. Then, the administrator can grasp how much power is totally wasted in the office when the users are absent by monitoring a monitor 99a.
Note that the building management system 98 may refer to the data collection server 91. In this case, when the operation-power consumption integration unit 91b finds that power is wastefully consumed in the power strip 1 when the user is absent, it is preferable that the building management system 98 automatically lower power for lighting or air conditioning.
According to this embodiment, the power consumptions of the power strips 1 used by a number of users can be accumulated in the data collection server 91. When the unit of the accumulation is per day, per month, per power strip 1, and per electrical device, the power consumptions can be compared in various ways. Thus, further information for deciding whether to reduce the power consumption in an office or the like where a number of users gather can be provided from various aspects.
As illustrated in
Each switch 102 is a rocker switch. When a user presses a button 102x to an ON or Off side, each branch bar 17 can be electrically connected with a second bus bar 12 or electrically disconnected from the second bus bar 12.
Also, a cover 108 to house the magnetic cores is fixed onto the first circuit board 20 by screws 110.
Note that in
As illustrated in
Furthermore, in addition to the first to third bus bars 11 to 13, an auxiliary bar 104 is provided for supplying power to a light source such as an LED which is built in each switch 102.
The auxiliary bar 104 is manufactured by die cutting and bending a metal plate such as a brass plate, and has a plurality of branches 104a respectively corresponding to the switches 102. A sixth contact 104e, which is bent from the extending direction of the branch 104a to the vertical direction thereof, is formed at the end portion of the branch 104a.
As illustrated in
On the other hand,
These bus bars 11 and 13 may also be manufactured by die cutting and bending a metal plate such as a brass plate.
Also,
As illustrated in
As illustrated in
Furthermore, two fitting protrusions 108b are provided on the bottom portion of the cover 108. The fitting protrusions 108b fit in the fitting holes 20e provided in the first circuit board 20, thereby the cover 108 and the first circuit board 20 are aligned.
The cover 108 is provided for each magnetic core 21 and the cover 108 is fixed on the first circuit board 20 via screws as described above. Thus, the stability of the magnetic cores 21 on the first circuit board 20 is improved.
On the other hand, first to third terminals 102a to 102c are provided in the switch 102. These terminals 102a to 102c respectively fit to the fourth contact 11e, the fifth contact 17e, and the sixth contact 104e.
As illustrated in
The light source 120 emits light in the On-state to entirely illuminate the translucent button 102x (see
Note that the power strip 101 according to this embodiment also has a transmission circuit unit 27 with the same circuit configuration as that of
According to this embodiment, as illustrated in
Furthermore, as illustrated in
Although the embodiments are described in detail, the embodiments are not limited to the above.
For example, the description is given of the case where a plurality of plug insertion portions 1a is provided in the power strips 1 and 101 in
All examples and conditional language provided herein are intended for the pedagogical purpose of aiding the reader in understanding the invention and the concepts contributed by the inventor to further the art, and are not to be construed as limitations to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although one or more embodiments of the present invention has been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Nakazawa, Fumihiko, Soneda, Hiromitsu, Tsuboi, Osamu
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