JP2011059073A - Device and system for measuring electric power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power measuring device and an electric power measuring system measuring power consumption of an apparatus having no installation space therearound. <P>SOLUTION: In the electric power measuring device 1, a printed wiring board 20 mounted with circuit components constituting a means for measuring electric power consumed by an apparatus 100<SB>i</SB>is fixed in an enclosure of the apparatus 100<SB>i</SB>by a fixing means (spacer 21). Therefore, an electric power measuring device (an electric power measuring module), so-called an apparatus built-in type can be provided. As a result, power consumption of an apparatus having no installation space therearound can be measured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power measurement device and a power measurement system that measure power consumed by a device.

  In recent years, in order to reduce carbon dioxide emissions, the main cause of global warming, power (instantaneous power and integrated power) is measured for each device that consumes power, and is actually consumed by each device. Energy saving (power saving) has been attempted so that the power can be easily grasped. And there exists what is described in patent document 1 as an electric power measurement apparatus and electric power measurement system used for such an application.

JP 2009-104554 A (see paragraph 0016 and FIG. 3)

  By the way, although the electric power measurement apparatus described in patent document 1 needs to be installed around the apparatus which is the measurement object of electric power, there may be no installation space around the said apparatus. Therefore, there is a possibility that devices that can measure power are limited in the conventional power measuring device.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a power measurement device and a power measurement system capable of measuring the power consumption of a device having no installation space in the vicinity.

  In order to achieve the above object, the invention of claim 1 is an input current measuring means for measuring an input current to an apparatus, an input voltage measuring means for measuring an input voltage to the apparatus, and a measurement result of the input current measuring means. Calculating means for calculating the power consumed by the device based on the measurement result of the input voltage measuring means, display means for displaying the measured value of the power calculated by the calculating means, and converting the measured value into an electrical signal. Output signal means, a printed wiring board on which circuit components constituting each means are mounted, and fixing means for fixing the printed wiring board in the device.

  According to the first aspect of the present invention, the printed wiring board on which the circuit components constituting the means for measuring the power consumed by the device is fixed in the device by the fixing means. A measurement device (power measurement module) can be realized. As a result, it is possible to provide a power measuring device that can measure the power consumption of a device that does not have an installation space around it.

  According to a second aspect of the present invention, in the first aspect of the invention, the signal output means performs power line carrier communication via a power line in which power is supplied from an external power source to the device.

  According to the invention of claim 2, wiring saving can be achieved.

  According to a third aspect of the present invention, there is provided a feed wiring means for feeding and wiring the power line according to the second aspect of the invention.

  According to the invention of claim 3, since the power line that also serves as the communication line can be fed by the feed wiring means, further wiring saving can be achieved.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the calculation means determines that the signal when the power consumed by the device does not exceed a predetermined standby power. A standby power detection signal is output from the output means.

  According to the invention of claim 4, it is possible to detect that the device is in a standby state and notify the outside.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the calculation means outputs a standby power detection signal from the signal output means when a state in which the variation in the measured power value is within a predetermined range continues for a predetermined time. It is characterized by making it.

  According to the invention of claim 5, it is possible to detect that the device is in a standby state even when the standby power of the device is not known.

  According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the calculation unit is configured to detect the standby power detection signal from the signal output unit when a state where the measured power value is equal to or less than a predetermined threshold value continues for a predetermined time. Is output.

  According to the sixth aspect of the present invention, when the standby power of a device is known, it can be accurately detected that the device is in a standby state.

  According to a seventh aspect of the present invention, in order to achieve the above object, a center device that collects power measurement values from each power measurement device by one or more power measurement devices according to claim 2 and power line carrier communication via the power line It is characterized by having.

  According to the seventh aspect of the present invention, it is possible to provide a power measurement system capable of measuring power consumption of a device having no installation space in the vicinity and collecting measured values of power consumption of a plurality of devices by a center device.

  ADVANTAGE OF THE INVENTION According to this invention, the power measuring device and power measuring system which can measure the power consumption of the apparatus with no installation space around can be provided.

It is an appearance perspective view showing an embodiment of a power measuring device concerning the present invention. 1 is a system configuration diagram showing an embodiment of a power measurement system according to the present invention. It is the block diagram which abbreviate | omitted partially showing embodiment of an electric power measurement apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 2, the power measurement system of the present embodiment is built in a device 100 _i (i = 1, 2,..., N) and consumed by the device 100 _i (instantaneous power and integrated power amount). ) And a center device 200 that collects measurement values measured by the plurality of power measurement devices 1. 2 shows only the power measuring device 1 built in the device 100 ₁ , the power measuring devices 1 built in the other devices 100 _{2 to} 100 _n all have the same configuration. The illustration is omitted.

The apparatus 100 _i is an air conditioner (air conditioner) that is a so-called home electric appliance, a refrigerator, a television receiver, a lighting device, or the like, or a molding machine that is an industrial apparatus, and receives AC power supplied from a commercial power source AC. A power supply circuit unit 101 that converts direct current or alternating current of a desired voltage, and uses (consumes) the direct-current power or alternating-current power converted by the power supply circuit unit 101 to perform a predetermined function, for example, cooling or heating in the case of an air conditioner A function to cool the interior if it is a refrigerator, a function to receive a TV broadcast and display an image and sound a sound if it is a television receiver, a function to turn on a light source if it is a lighting fixture, and a molding machine If there is a main body function unit 102 that performs a function of melting the resin material and injecting the molten resin material into the mold, a housing (including the power supply circuit unit 101 and the main body function unit 102) Has a Shimese not) and.

  As shown in FIG. 2, the power measuring apparatus 1 includes a calculation unit 10, a voltage input unit 11, a current input unit 12, a current sensor 13, a display unit 14, an output unit 15, an input terminal unit 16, an output terminal unit 17, and a PLC modem. The circuit component (IC, a terminal block, a connector, etc.) which comprises the part 18 and the power supply part 19, and comprises these parts 10-19 is mounted and comprised on the rectangular printed wiring board 20 (refer FIG. 1). .

Input terminal unit 16 is connected to the branch line Lx for branching the power line Lp to the power supply circuit unit 101 of the device 100 _i is connected to the power line Lp, which is connected to the commercial power source AC, further to another device 100 ₂ For example, it has a plurality of screw terminals connected in parallel to each other or a conventionally known quick connection terminal, and is mounted on one end in the longitudinal direction of the printed wiring board 20. Has been.

  The voltage input unit 11 detects a voltage (input voltage) input to the input terminal unit 16 and outputs an analog voltage detection signal to the calculation unit 10. The current input unit 12 detects a current (input current) input to the input terminal unit 16 by the current sensor 13 and outputs an analog current detection signal to the calculation unit 10.

  The arithmetic unit 10 is composed of a one-chip microcomputer incorporating a memory, a clock, an A / D converter, and the like. The voltage detection signal and the current detection signal are converted into digital signals by the A / D converter and fetched into the memory. By executing the stored program, the instantaneous power and the integrated power amount are calculated from the voltage detection value and the current detection value. The arithmetic unit 10 is mounted near the center of the printed wiring board 20 in the longitudinal direction, the voltage input unit 11 and the current input unit 12 are mounted near the arithmetic unit 10 in the printed wiring board 20, and the current sensor 13 is connected to the arithmetic unit 10. And the input terminal portion 16 (see FIG. 1).

  The display unit 14 integrates a liquid crystal display and a drive circuit on one chip, and displays the power measurement value calculated by the calculation unit 10 on the liquid crystal display with numbers (7 segments) by the drive circuit. The printed wiring board 20 is mounted in the vicinity of the arithmetic unit 10.

  The output unit 15 converts the power measurement value calculated by the calculation unit 10 into an electrical signal and outputs it to the output terminal unit 17, and is mounted in the vicinity of the calculation unit 10 on the printed wiring board 20. The output terminal portion 17 includes, for example, a connector receptacle that is detachably connected to a connector plug provided on the other end side of a signal line (not shown) connected to the main body function portion 102 on one end side. The signal output from the unit 15 is sent to the signal line, and is mounted on the other end in the longitudinal direction of the printed wiring board 20.

  The PLC modem unit 18 interfaces data communication performed between the arithmetic unit 10 and the center device 200 by the conventionally known power line carrier communication (PLC). Implemented in the vicinity.

  The power supply unit 19 is composed of a single-chip AC / DC converter, converts AC power supplied via the input terminal unit 16 into DC power, and supplies it to each unit such as the arithmetic unit 10 and the display unit 14. The printed wiring board 20 is mounted in the vicinity of the input terminal portion 16.

Here, at the four corners of the printed wiring board 20, spacers 21 formed in a prismatic shape by an insulating synthetic resin material are provided. Then, by fixing the distal end portion of the four spacers 21 to the housing of the device 100 _i, it is possible to fix the printed circuit board 20 (electric power measuring device 1) in the housing. The spacer 21 is fixed to the housing by an appropriate method such as adhesion or caulking in addition to screwing. For example, a screw inserted from a screw insertion hole provided at four corners of the printed wiring board 20 is inserted into an insertion hole penetrating the spacer 21, and the screw protruding from the tip of the spacer 21 is screwed into a screw hole provided in the housing. Can be screwed together. However, the fixing means for fixing the printed wiring board 20 to the casing of the device 100 _i is not limited to the spacer 21. For example, the printed wiring board 20 is housed in a box-shaped case and extended from the case. A structure in which a strip-shaped fixing piece is screwed to the housing may be employed.

The power measuring device 1 according to the present embodiment is configured as described above, and fixes the printed wiring board 20 on which circuit components constituting the means for measuring the power consumed by the device 100 _i are mounted. can be fixed in the housing of the device 100 _i by 21), so-called equipment built-in power measurement device (power measurement module) can be realized, as a result, measures the power consumption of the installation space is not equipment around It becomes possible.

Further, in the power measurement system of the present embodiment, each power measurement device 1 incorporated in each of the plurality of devices 100 _i measures power by power line carrier communication via the power line Lp that is sent and wired to each device 100 _i. The value can be transmitted to the sensor device 200. For this reason, since it is not necessary to wire a communication line for data communication between the center apparatus 200 and each power measuring apparatus 1, wiring saving can be achieved. The center device 200 stores the power measurement value for each device 100 _i collected from each power measurement device 1 in a storage medium (semiconductor memory, hard disk device, etc.) and, if necessary, a display device (liquid crystal display, etc.). It can be displayed.

  By the way, in devices such as air conditioners and television receivers, only the function of receiving the wireless signal transmitted from the remote control transmitter is enabled, and other functions are stopped (standby state). Many. The power consumed in this standby state (standby power) is very small compared to the power consumed during operation, but if it is still consumed over a long period of time, it is necessary to save power. The amount of power will not be negligible.

Therefore, the arithmetic unit 10 of the power measurement device 1, device 100 _i is in a standby state on condition that the power consumed by the device 100 _i (instantaneous power) is determined not to exceed the power when a predetermined waiting This is detected, and a standby power detection signal is output from the output unit 15 via the output terminal unit 17 to the outside. The standby power detection signal excites a relay Ry that opens a relay contact (normally closed contact) r inserted between the power supply circuit unit 101 and the main body function unit 102 of the device 100 _i as shown in FIG. It is configured. Therefore, when the relay Ry excited by the standby power detection signal opens the relay contact r, power supply from the power supply circuit unit 101 to the main body function unit 102 is stopped, and standby power consumption becomes zero.

Here, there are the following two methods for the calculation unit 10 to determine whether the power (instantaneous power) consumed by the device 100 _i exceeds a predetermined standby power.

One method pays attention to the fact that standby power hardly fluctuates compared to power consumption during operation, and fluctuations in power measurement values are within a predetermined range (range that is sufficiently narrower than the power consumption fluctuation range during operation). This is a method of determining that the standby power is exceeded when the state in the state continues for a predetermined time (for example, several minutes). According to this method, the device 100 _i even standby power devices 100 _i is not known to be detected that is in standby mode.

In another method, when the standby power of the device 100 _i is known, the power measurement value is equal to or less than a predetermined threshold (a value approximately equal to the standby power) for a predetermined time (for example, several minutes). ) It is a method of judging that the standby power is exceeded when it continues. According to this method, it is possible to accurately detect that the device 100 _i is in a standby state when the standby power of the device 100 _i is known.

DESCRIPTION OF SYMBOLS 1 Electric power measurement apparatus 10 Calculation part (calculation means)
11 Voltage input section (input voltage measuring means)
12 Current input section (input current measuring means)
13 Current sensor (input current measuring means)
14 Display section (display means)
15 Output unit (signal output means)
20 Printed wiring board 21 Spacer (fixing means)

Claims (7)

  The input current measuring means for measuring the input current to the equipment, the input voltage measuring means for measuring the input voltage to the equipment, the measurement result of the input current measuring means and the measurement result of the input voltage measuring means are consumed by the equipment. Computing means for computing power, display means for displaying the measured value of power computed by the computing means, signal output means for converting the measured value into an electrical signal and outputting it, and circuits constituting the means An electric power measurement apparatus comprising: a printed wiring board on which components are mounted; and a fixing unit that fixes the printed wiring board in the device.   The power measuring apparatus according to claim 1, wherein the signal output means performs power line carrier communication via a power line in which power is supplied from an external power source to the device.   3. The power measuring device according to claim 2, further comprising feed wiring means for feeding and wiring the power line.   The calculation means causes the signal output means to output a standby power detection signal when it is determined that the power consumed by the device does not exceed a predetermined standby power. The power measuring device according to any one of the above.   5. The power measuring device according to claim 4, wherein the calculation unit causes the signal output unit to output a standby power detection signal when a state in which the variation of the power measurement value is within a predetermined range continues for a predetermined time. .   5. The power according to claim 4, wherein the calculation means causes the signal output means to output a standby power detection signal when a state where the measured power value is equal to or less than a predetermined threshold value continues for a predetermined time. Measuring device.   3. A power measurement system comprising: one or more power measurement devices according to claim 2; and a center device that collects power measurement values from each power measurement device by power line carrier communication via a power line.

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